JP6322750B2 - Plate heat exchanger - Google Patents

Description

  The present invention defines a first flow path for flowing the first fluid and a second flow path for flowing the second fluid, and the first fluid in the first flow path and the second fluid in the second flow path It is related with the plate-type heat exchanger provided with the heat-transfer plate which heat-exchanges.

  Conventionally, a plate heat exchanger for exchanging heat between a first fluid and a second fluid is a plurality of heat transfer plates each having a first surface in the first direction and a second surface opposite to the first surface. A plurality of heat transfer plates stacked in the first direction are provided.

  Each first surface of the plurality of heat transfer plates is a ridge and a ridge that are long in a direction including the second direction or the second direction orthogonal to the first direction, and the first direction and the second direction. It has a plurality of ridges and ridges formed alternately in a third direction orthogonal to the direction. On the other hand, each 2nd surface of a some heat-transfer plate has the protruding item | line which has the concave line which has the relationship between the convex line of the 1st surface and the front and back, and the concave line of the first surface, and the front and back surface. That is, the second surface of each of the plurality of heat transfer plates is also a ridge and a ridge that are long in the direction including the second direction or the second direction, and is alternately formed in the third direction. It has a plurality of ridges and ridges.

  In this type of plate heat exchanger, the plurality of heat transfer plates have their first surfaces opposed to the first surfaces of adjacent heat transfer plates on one side in the first direction, and on one side in the first direction. While forming the 1st flow path which distribute | circulates a 1st fluid to a 3rd direction between adjacent heat-transfer plates, the heat-transfer plate and 2nd surface which adjoin the 2nd surface of the other on the other side of a 1st direction A second flow path is formed to allow the second fluid to flow in the third direction between the opposing heat transfer plates on the other side in the first direction.

  Thereby, a plate type heat exchanger heat-exchanges the 1st fluid which distribute | circulates a 1st flow path, and the 2nd fluid which distribute | circulates a 2nd flow path via a heat exchanger plate.

  By the way, each of the ridges on the first surface and the ridges on the second surface of the heat transfer plate includes at least one linear portion extending in a direction including the second direction or the second direction orthogonal to the first direction as a component. .

  When heat exchange is performed between the viscous first fluid and the first fluid containing solids and the second fluid, each of the plurality of heat transfer plates has a linear portion of the ridge on its first surface. With the heat transfer plate adjacent on one side in one direction and the concave surface of the first surface, the first surface of itself is directed to the first surface of the heat transfer plate adjacent on one side in the first direction. Opposite each other with a gap in the first direction. Thereby, the part which becomes the obstruction | occlusion of the distribution | circulation of a 1st fluid is lose | eliminated in the 1st flow path which distribute | circulates the 1st fluid containing a viscous 1st fluid and solid substance, and the distribution | circulation property of a 1st fluid is ensured ( For example, see Patent Document 1).

No. 7-22618

  However, in the conventional plate heat exchanger, when the first fluid is circulated through the first flow path, the heat transfer efficiency between the first fluid and the second fluid tends to be low.

  Specifically, the protrusion on the second surface of the heat transfer plate is a virtual surface extending in the second direction and the third direction, and the top of the protrusion on the second surface of the heat transfer plate adjacent in the first direction. The amount of protrusion is set so that the top is located on a virtual plane in contact with the. Thereby, the depth of the concave line of the 1st surface which has a front-and-back relationship with the convex line of the 2nd surface will become deep.

  For this reason, when the first fluid including the viscous first fluid and the solid fluid flows through the first flow path, the first fluid tends to enter and stay in the back of the recess on the first surface of the heat transfer plate. is there. Therefore, there exists a problem that the 1st fluid which retains in the groove on the 1st surface will reduce the heat exchange efficiency with respect to the 2nd fluid.

  Therefore, the present invention provides a plate-type heat which can suppress the stagnation of the fluid partially and exhibit the maximum heat exchange performance even when a fluid having viscosity or a fluid containing solids is circulated. It is an object to provide an exchanger.

  The plate heat exchanger according to the present invention is a plurality of heat transfer plates having a first surface in the first direction and a second surface opposite to the first surface, and a plurality of heat transfer plates stacked in the first direction. The first surface of each of the plurality of heat transfer plates includes a plurality of ridges and ridges having a length in a direction including a second direction or a second direction perpendicular to the first direction as a component. , Having a plurality of ridges and ridges alternately formed in a third direction orthogonal to the first direction and the second direction, each second surface of the plurality of heat transfer plates is a ridge of the first surface And the first surface of the first surface of the heat transfer plate and the second surface of the first surface of the first surface of the first surface Extends in a direction including the second direction or the second direction perpendicular to the direction as a component, and is spaced in the direction including the second direction or the second direction as a component. A plurality of arranged straight portions, each of which is in a direction perpendicular to a direction including the second direction or the second direction with respect to a linear portion adjacent to each other in the second direction or the direction including the second direction. Each of the plurality of heat transfer plates includes a plurality of linear portions that are misaligned, and each of the plurality of heat transfer plates has a concave portion on the first surface of the heat transfer plate that is adjacent on one side of the first direction with the straight portion of the ridge on its first surface. One side of the first direction is opposed to the first surface of the adjacent heat transfer plate on one side in the first direction with a gap in the first direction in a state along the strip. The first flow path for flowing the first fluid in the third direction is formed between the adjacent heat transfer plates and the second heat transfer plate and the second surface adjacent to each other on the other side of the first direction. The second fluid is circulated in the third direction between the heat transfer plate adjacent to the other side in the first direction. Forming the second flow path, and the straight portions of the ridges on the second surface of the heat transfer plate facing the first surfaces in the first direction are the highest portion protruding in the first direction and the first direction. The protrusion has a low part lower than the high part, and has at least one low part aligned with the high part in the extending direction of the straight line portion.

  According to the said structure, the 1st flow path which distribute | circulates a 1st fluid to a 3rd direction between adjacent heat-transfer plates by making 1st surfaces oppose in a 1st direction is formed, and 2nd surfaces are 1st direction. A second flow path for allowing the second fluid to flow in the third direction between adjacent heat transfer plates is formed. And each of the plurality of heat transfer plates is in a state where the linear portion of the ridge on its first surface is aligned with the heat transfer plate adjacent on one side in the first direction and the groove on the first surface, Since the first surface of its own is opposed to the first surface of the adjacent heat transfer plate on one side in the first direction with an interval in the first direction, between the heat transfer plates forming the first flow path ( There is no contact between the straight part and the groove. Therefore, a path without any flow resistance is formed in the first flow path.

  Thereby, when the 1st fluid containing a highly viscous 1st fluid and solid substance is distribute | circulated to the 1st flow path, the smoothness of the distribution | circulation of a 1st fluid is ensured. In addition, since the ridges on the second surface of the heat transfer plate are in a front-back relationship with the ridges on the first surface, the straight portion on the ridges on the second surface has a high part and a low part. A deep portion and a shallow portion can be formed in the concave portion of the first surface, which is the back side of the straight portion (high portion, low portion) of the convex portion of the second surface. In the shallow part of the groove on the first surface, the region where the first fluid enters is smaller than the deep part, so in the shallow part of the groove on the first surface, the first fluid Circulates in the third direction without stagnation. On the other hand, the first fluid enters the deep part of the concave surface of the first surface, but there is a shallow part adjacent to the deep part of the concave line. The first fluid that has entered the deep portion of the recess is drawn into the first fluid that flows through the shallow portion and flows in the third direction.

  And since the linear part in the protruding item | line on a 2nd surface has a high part and a low part, a 2nd fluid becomes easy to distribute | circulate in the low part of a linear part in a 2nd flow path. That is, since the distance between the low part of the straight part and the heat transfer plate of the other party is wider than the distance between the high part of the straight part and the heat transfer plate of the other part, the flow resistance of the second fluid is reduced, Fluid becomes easy to circulate.

  As a result, each of the first fluid in the first flow path and the second fluid in the second flow path smoothly flows, so that the first fluid flowing in the first flow path and the second flow path in the second flow path. Heat exchange efficiency with two fluids is improved.

  As one aspect of the present invention, each of the plurality of ridges on the second surface of the heat transfer plate aligns the linear portions of the ridges adjacent in the third direction with the concave ridges and the linear portions of the ridges. The number of low portions of the straight line portion of the ridge on the second surface of the heat transfer plate is the straight line portion of the ridge adjacent to either side of the third direction across the groove with respect to the ridge. It is preferable that it is different from the number of low sites. If it does in this way, arrangement | positioning in the 2nd direction of the low site | part of the protruding item | line (straight part) adjacent to a 3rd direction on a 2nd surface will differ for every protruding item | line (straight line part). In connection with this, the shallow part of the concave of the first surface also differs for each concave. Therefore, the 1st fluid which distribute | circulates in a 3rd direction in a 1st flow path distribute | circulates so that the shallow part of the depth of the concave of the 1st surface may be followed. Therefore, the dispersibility of the first fluid in the first flow path is increased, and the heat exchange efficiency between the first fluid and the second fluid is increased.

  As another aspect of the present invention, the low portion of the straight portion of the ridge on the second surface of the heat transfer plate is the straight portion of the ridge that is adjacent to the ridge in the third direction with the groove interposed therebetween. The position may be shifted in the second direction with respect to the low part. If it does in this way, arrangement | positioning in the 2nd direction of the low site | part of the protruding item | line (straight part) adjacent to a 3rd direction on a 2nd surface will differ for every protruding item | line (straight line part). In connection with this, the shallow part of the concave of the first surface also differs for each concave. Therefore, the 1st fluid which distribute | circulates in a 3rd direction in a 1st flow path distribute | circulates so that the shallow part of the depth of the concave of the 1st surface may be followed. Therefore, the dispersibility of the first fluid in the first flow path is increased, and the heat exchange efficiency between the first fluid and the second fluid is increased.

  In these cases, in the ridges on the second surface of the heat transfer plate, the ratio between the width dimension W of the low part in the direction in which the linear portion extends and the height difference d in the first direction between the high part and the low part ( W / d) is preferably 2 or more. In this way, the formation range of the low part of the straight portion and the formation range of the shallow part of the depth of the groove on the first surface are appropriate, and the flowability of the first fluid in the first channel and the second channel The fluidity of the second fluid in is improved.

  As another aspect of the present invention, each of the plurality of heat transfer plates has a linear portion of the ridge on its second surface as a groove on the second surface of the heat transfer plate adjacent on the other side in the first direction. In a state of being aligned, the second surface of the self is opposed to the second surface of the heat transfer plate adjacent on the other side in the first direction with a gap in the first direction, and the second surfaces are opposed to each other in the first direction. The straight portions of the ridges on the first surface of the heat transfer plate that are opposed to each other are a high portion that protrudes most in the first direction and a low portion that has a protruding amount in the first direction lower than the high portion, You may have at least 1 low part along with a high part in the direction where a part extends.

  If it does in this way, between heat-transfer plates which form the 2nd channel (between a straight part and a concave strip) will become non-contact. Therefore, a path without any flow resistance is formed in the second flow path.

  Thereby, when the 2nd fluid containing highly viscous 2nd fluid and solid substance is distribute | circulated to the 2nd flow path, the smoothness of the distribution | circulation of a 2nd fluid is ensured. And since the ridges on the first surface of the heat transfer plate are in a front-back relationship with the ridges on the second surface, the straight portion on the ridges on the first surface has a high part and a low part. A deep portion and a shallow portion can be formed on the concave portion of the second surface which is the back side of the straight portion (high portion, low portion) of the convex portion on the first surface. In the shallow part of the groove on the second surface, the region where the second fluid enters is smaller than the deep part, so in the shallow part of the groove on the second surface, the second fluid Circulates in the third direction without stagnation. On the other hand, the second fluid enters the deep part of the concave groove on the second surface, but there is a shallow part adjacent to the deep part of the concave part. The second fluid that has entered the deep portion of the recess is drawn into the second fluid that flows through the shallow portion and flows in the third direction.

  Moreover, since the linear part in the protruding item | line on a 1st surface has a high part and a low part, a 1st fluid becomes easy to distribute | circulate in the low part of a linear part in a 1st flow path. That is, since the distance between the low part of the straight part and the heat transfer plate of the counterpart is wider than the distance between the high part of the straight part and the heat transfer plate of the counterpart, the flow resistance of the first fluid is reduced. Fluid becomes easy to circulate.

  As a result, each of the first fluid in the first flow path and the second fluid in the second flow path flows more smoothly, and as a result, flows in the first flow path and the second flow path in the first flow path. The efficiency of heat exchange with the second fluid is further improved.

  In addition, each of the plurality of ridges on the first surface of the heat transfer plate aligns the linear portions of the ridges adjacent in the third direction with the concave ridges interposed therebetween, and the linear portions of the heat transfer plate. The number of low portions of the straight portion of the ridge on the first surface is the number of low portions of the straight portion of the ridge adjacent to either side of the third direction across the concave with respect to the ridge. And may be different. If it does in this way, arrangement | positioning in the 2nd direction of the low site | part of the protruding item | line (straight part) adjacent to a 3rd direction on a 1st surface differs for every protruding item | line (straight line part). In connection with this, the shallow part of the concave of the second surface also differs for each concave. Accordingly, the second fluid that circulates in the third direction in the second flow path circulates so as to follow the shallow portion of the concave groove on the second surface. Therefore, the dispersibility of the second fluid in the second flow path is increased, and the heat exchange efficiency between the first fluid and the second fluid is increased.

  Moreover, the low part of the linear part in the protruding item | line on the 1st surface of a heat exchanger plate is low with respect to the low part of the linear part of the protruding item | line which adjoins a protruding item | line on a 3rd direction across the protruding item | line. You may arrange | position with position shift in a 2nd direction. If it does in this way, arrangement | positioning in the 2nd direction of the low site | part of the protruding item | line (straight part) adjacent to a 3rd direction on a 1st surface differs for every protruding item | line (straight line part). In connection with this, the shallow part of the concave of the second surface also differs for each concave. Accordingly, the second fluid that circulates in the third direction in the second flow path circulates so as to follow the shallow portion of the concave groove on the second surface. Therefore, the dispersibility of the second fluid in the second flow path is increased, and the heat exchange efficiency between the first fluid and the second fluid is increased.

  Further, in the ridge on the first surface of the heat transfer plate, the ratio (W / of the width dimension W of the low part in the extending direction of the linear portion and the height difference d in the first direction between the high part and the low part. It is preferable that d) is 2 or more. In this way, the formation range of the low part of the straight portion and the formation range of the shallow part of the depth of the groove on the first surface are appropriate, and the flowability of the first fluid in the first channel and the second channel The fluidity of the second fluid in is improved.

  The present invention has an excellent effect that even when a fluid having a viscosity or a fluid containing a solid is circulated, the fluid is prevented from being partially retained and the maximum heat exchange performance can be exhibited. Can play.

FIG. 1 is a schematic overall perspective view of a plate heat exchanger according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the plate heat exchanger according to the embodiment. Drawing 3 is a figure seen from the 1st surface side of a heat exchanger plate in a plate type heat exchanger concerning the embodiment. FIG. 4 is a view seen from the second surface side of the heat transfer plate in the plate heat exchanger according to the embodiment. FIG. 5 is an enlarged view of a portion V in FIG. FIG. 6: is the elements on larger scale of the heat exchanger plate which concerns on the same embodiment, Comprising: The part which has two low parts in the protruding item | line on a 1st surface (a 1st linear part, a 2nd linear part, a short protruding item | line) It is sectional drawing which cut | disconnected along the longitudinal direction. FIG. 7: is the elements on larger scale of the heat exchanger plate which concerns on the same embodiment, Comprising: The part which has one low site | part in the protrusion on the 1st surface (a 1st straight part, a 2nd straight part, a short protrusion) It is sectional drawing which cut | disconnected along the longitudinal direction. FIG. 8 is a partial enlarged cross-sectional view of the heat transfer plate according to the embodiment, and the end inclined portion of the first long ridge which is a ridge on the first surface is along a direction orthogonal to the longitudinal direction. FIG. FIG. 9 is a partial enlarged cross-sectional view of the heat transfer plate according to the embodiment, and a connection inclined portion of the first long ridge which is a ridge on the first surface along a direction orthogonal to the longitudinal direction. It is sectional drawing cut | disconnected. FIG. 10 is an enlarged view of a portion X in FIG. FIG. 11 is a partial enlarged cross-sectional view of the heat transfer plate according to the same embodiment, and cuts along the longitudinal direction a portion (straight portion, parallel portion) having two low portions in the ridge on the second surface. FIG. FIG. 12 is a partial enlarged cross-sectional view of the heat transfer plate according to the same embodiment, and cuts a portion (a straight portion, a parallel portion) having one low portion of the ridge on the second surface along the longitudinal direction. FIG. FIG. 13 shows a gasket (first flow path forming gasket, second annular gasket) and a flow path (first flow path, first inflow path, first flow) formed by the gasket in the plate heat exchanger according to the embodiment. It is explanatory drawing for demonstrating (departure). FIG. 14 shows a gasket (second flow path forming gasket, first annular gasket) and a flow path (second flow path, second inflow path, etc.) formed by the gasket in the plate heat exchanger according to the embodiment. It is explanatory drawing for demonstrating a 2nd outflow channel. FIG. 15 is a partial cross-sectional view of the plate heat exchanger according to the embodiment, and is a partial cross-sectional view in which a part of the main heat transfer region of the heat transfer plate is cut along a third direction. FIG. 16 is a partially enlarged view of the vicinity of the end inclined portion of the heat transfer plate in the plate heat exchanger according to the embodiment, in which one heat transfer plate of the adjacent heat transfer plates is indicated by a virtual line, It is the elements on larger scale for demonstrating the overlap state of the edge part inclination part of a matching heat-transfer plate. FIG. 17: is the elements on larger scale near the connection inclination part of the heat exchanger plate in the plate type heat exchanger which concerns on the same embodiment, Comprising: One heat exchanger plate of an adjacent heat exchanger plate is shown with a virtual line, and it adjoins It is the elements on larger scale for demonstrating the overlapping state of the connection inclination part of a heat exchanger plate. FIG. 18 is a partial schematic enlarged view including an end inclined portion and a connection inclined portion of the heat transfer plate in the plate heat exchanger according to the embodiment, and the first fluid is circulated through the first flow path. It is the partial schematic enlarged view of the state which distribute | circulated the 2nd fluid to the two flow paths. FIG. 19 is a partial schematic enlarged view including the end inclined portion and the connection inclined portion of the heat transfer plate in the plate heat exchanger according to the same embodiment, in which the fluid pressure in the first flow path is not acting. Or it is the partial schematic enlarged view of the state in which the fluid pressure in a 1st flow path is smaller than the fluid pressure of a 2nd flow path.

  Hereinafter, a plate heat exchanger according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the plate heat exchanger 1 includes a plurality of heat transfer plates 2,. Specifically, as shown in FIG. 2, the plate heat exchanger 1 according to this embodiment includes a plurality of heat transfer plates 2,... Stacked in the first direction and adjacent heat transfer plates in the first direction. 2, and a plurality of gaskets 3, 4, 5, 6 interposed between the heat transfer plates 2.

  As shown in FIGS. 1 and 2, the plate heat exchanger 1 according to this embodiment includes a pair of end plates 7, 7 that sandwich a plurality of heat transfer plates 2,. It further includes fastening members 8 (see FIG. 1) for fastening the pair of end plates 7 and 7 sandwiching the heat transfer plates 2.

  As shown in FIGS. 3 and 4, the heat transfer plates 2,... Have a first surface S1 and a second surface S2 opposite to the first surface S1. The heat transfer plates 2 are made by press-molding a metal plate. Accordingly, the form on the first surface S1 and the form on the second surface S2 are in a correspondence relationship.

  Each of the first surface S1 and the second surface S2 of the heat transfer plates 2,... Has a center line CL1 extending in a second direction orthogonal to the first direction (hereinafter referred to as a horizontal center line) CL1, and the first direction and the second direction. And a pair of end regions A2 and A2 sandwiching the main heat transfer region A1 in the third direction including an intersection with a center line CL2 extending in a third direction orthogonal to the center line (hereinafter referred to as a vertical center line) CL2. Including.

  In the present embodiment, the heat transfer plates 2, ... have a rectangular shape in front view. That is, the outer shape of the heat transfer plates 2,... Is a pair of short sides SE each extending in the second direction and spaced in the third direction, and each extending in the third direction and spaced in the second direction. And a pair of long sides LE.

  The main heat transfer area A1 is an area having a rectangular shape in front view with a pair of long sides LE defining the outer shape of the heat transfer plates 2,. Each of the pair of end regions A2 and A2 is continuous with the main heat transfer region A1. Each of the pair of end regions A2, A2 has a pair of long sides LE that define the outer shape of the heat transfer plates 2,... As both end edges in the second direction and a short side that defines the outer shape of the heat transfer plates 2,. It is a rectangular region in front view with SE as the edge in the third direction.

  The main heat transfer area A1 of the first surface S1 and the main heat transfer area A1 of the second surface S2 are in a front-back relationship. Further, one end region A2 of the first surface S1 and one end region A2 of the second surface S2 are in a front-back relationship, and the other end region A2 of the first surface S1 and the second surface The other end region A2 of S2 has a front-back relationship.

  Each of the pair of end regions A <b> 2 and A <b> 2 has a first opening 20 and a second opening 21 that is spaced from the first opening 20 in the second direction. In the present embodiment, each of the pair of end regions A2 and A2 includes the first opening 20 provided in one of the two regions with the vertical center line CL2 as a boundary, and the vertical center line CL2 as a boundary. And the second opening 21 provided in the other of the two regions. Here, one region is a region on one end side in the second direction of the heat transfer plate 2, and the other region is a region on the other end side in the second direction of the heat transfer plate 2. Accordingly, the first openings 20 of the pair of end regions A2 and A2 are both positioned on one end side (one long side LE side) of the heat transfer plate 2 in the second direction, and the pair of end regions A2 , A <b> 2 are each located on the other end side (the other long side LE side) of the heat transfer plate 2 in the second direction. In the present embodiment, the first opening 20 and the second opening 21 are circular.

  Each of the first surface S1 and the second surface S2 of the heat transfer plates 2, ... has gasket placement portions 22, 23, 24, 25 for placing gaskets 3, 4, 5, 6 therein.

  In the present embodiment, the heat transfer plates 2,... Surround the first flow path forming gasket arrangement portion 22 provided in conformity with the form of the first flow path through which the first fluid flows and the second opening 21. A first annular gasket surrounding the first opening 20; a second annular gasket arrangement portion 23; a second flow passage forming gasket arrangement portion 24 provided in conformity with the form of the second flow passage through which the second fluid flows; And an arrangement portion 25.

  Specifically, as shown in FIG. 3, the first surface S <b> 1 of the heat transfer plates 2,... Serves as a pair of first openings 20 as a pair of second openings 21 as gasket arrangement portions 22 and 23. And a pair of second annular gasket arrangement portions 23 surrounding each of the pair of second openings 21.

  On the other hand, the second surface S2 of the heat transfer plates 2,... Has a pair of second openings 21 as gasket arrangement portions 24, 25 as shown in FIG. It has the 2nd flow path formation gasket arrangement | positioning part 24 which encloses collectively, and a pair of 1st cyclic | annular gasket arrangement | positioning part 25 which encloses each of a pair of 1st opening 20. FIG.

  As shown in FIG. 3, the first flow path forming gasket arrangement portion 22 is provided across the main heat transfer area A1 and the end areas A2 and A2. Specifically, the first flow path forming gasket arrangement portion 22 is a pair of straight portions (hereinafter, referred to as first straight portions) 220 and 220 each extending in the third direction, and spaced in the second direction. The pair of first straight portions 220 and 220 and a pair of folded portions (hereinafter referred to as first folded portions) 221 and 221 connected to corresponding ends of the pair of first straight portions 220 and 220 are provided.

  Each of a pair of 1st straight parts 220 and 220 is arrange | positioned along the outer edge (both ends of the 3rd direction of heat-transfer plate 2, ...) of main heat-transfer area | region A1. Each of the pair of first straight portions 220, 220 has one end located at the boundary between the main heat transfer region A1 and one end region A2, and at the boundary between the main heat transfer region A1 and the other end region A2. The other end is located.

  One first folding part 221 of the pair of first folding parts 221, 221 is provided in one end region A2, and the other first folding part of the pair of first folding parts 221, 221. 221 is provided in the other end region A2.

  Each of the pair of first folded portions 221 and 221 includes a turn portion (hereinafter referred to as a first turn portion) 221a surrounding a part of the outer periphery of the first opening 20 in the end regions A2 and A2, and a first turn portion. 221a and a pair of 1st straight part 220, and a pair of connection part (henceforth a 1st connection part) 221b and 221b connected.

  The first turn part 221a has one end and the other end opposite to the one end. In the present embodiment, the first turn part 221 a is formed in an arc shape along a part of the outer periphery of the first opening 20. Accordingly, the first turn part 221a has the center of the first opening 20 as the center of curvature. In the first turn part 221a, the angle formed by the virtual line connecting the center of curvature and one end and the virtual line connecting the center of curvature and the other end is smaller than 180 degrees. One end of the first turn part 221a is located on an extension line of one first straight part 220.

  One first connection part 221b of the pair of first connection parts 221b and 221b is connected to one first straight part 220 and one end of the first turn part 221a. In the present embodiment, one first connection portion 221b extends straight. That is, one first connection part 221b is provided on an extension line of one first straight part 220, and is connected to one first straight part 220 and the first turn part 221a.

  On the other hand, the other first connection part 221b of the pair of first connection parts 221b and 221b is connected to the other first straight part 220 and the other end of the first turn part 221a. The other first connecting portion 221b has an arc shape having a larger radius of curvature than the radius of curvature of the first turn portion 221a. The other first connection part 221b bulges outward between an end part connected to the first turn part 221a and an end part connected to the other first straight part 220.

  In the present embodiment, the curvature of the other first connection portion 221b is set so that the other first straight portion 220 extends in a tangential direction with respect to the other first connection portion 221b.

  As described above, the first opening 20 is one of the two regions obtained by dividing the end region A2 with the longitudinal center line (center line extending in the third direction) CL2 of the heat transfer plates 2,. Placed in the area. Accordingly, the pair of first folded portions 221 and 221 are symmetrical with respect to the horizontal center line (center line extending in the second direction) CL1 in the heat transfer plates 2. Thus, the first flow path forming gasket arrangement portion 22 defines a trapezoidal region in which the dimension in the third direction becomes smaller from one end side to the other end side in the second direction.

  The second annular gasket placement portion 23 surrounds the second opening 21 in a region outside the region surrounded by the first flow path forming gasket placement portion 22. Each of the pair of second annular gasket arrangement portions 23 corresponds to the shape of the second opening 21. As described above, in the present embodiment, the second opening 21 has a circular shape. Accordingly, the pair of second annular gasket arrangement portions 23 are annular. In the present embodiment, the second annular gasket arrangement portion 23 is concentric with the second opening 21.

  As shown in FIG. 4, the second flow path forming gasket arrangement portion 24 is provided across the main heat transfer region A1 and the end regions A2 and A2. Specifically, the second flow path forming gasket arrangement portion 24 is a pair of straight portions (hereinafter, referred to as second straight portions) 240 and 240 each extending in the third direction, and spaced in the second direction. A pair of opened second straight portions 240 and 240 and a pair of folded portions (hereinafter referred to as second folded portions) 241 and 241 connected to corresponding ends of the pair of second straight portions 240 and 240 are provided.

  Each of a pair of 2nd straight parts 240 and 240 is arrange | positioned along the outer edge (both ends of the 3rd direction of heat-transfer plate 2, ...) of main heat-transfer area | region A1. Each of the pair of second straight portions 240, 240 has one end positioned at the boundary between the main heat transfer region A1 and one end region A2, and at the boundary between the main heat transfer region A1 and the other end region A2. The other end is located. In the present embodiment, the pair of second straight portions 240, 240 overlap with the pair of first straight portions 220, 220 on the first surface S1. That is, one second straight portion 240 of the pair of second straight portions 240 and 240 overlaps with the other first straight portion 220 of the pair of first straight portions 220 and 220, and the pair of second straight portions 240 and 240. The other second straight portion 240 of the straight portions 240 and 240 overlaps with the first straight portion 220 of the pair of first straight portions 220 and 220.

  One second folding part 241 of the pair of second folding parts 241 and 241 is provided in one end region A2, and the other second folding part of the pair of second folding parts 241 and 241. 241 is provided in the other end region A2.

  Each of the pair of second folded portions 241 and 241 includes a turn portion (hereinafter referred to as a second turn portion) 241a surrounding a part of the outer periphery of the second opening 21 in the end regions A2 and A2, and a second turn portion. 241a and a pair of 2nd straight parts 240 and 240, and a pair of connection part (henceforth a 2nd connection part) 241b and 241b are included.

  The second turn part 241a has one end and the other end opposite to the one end. In the present embodiment, the second turn portion 241 a is formed in an arc shape along a part of the outer periphery of the second opening 21. Accordingly, the second turn portion 241a uses the center of the second opening 21 as the center of curvature. In the second turn part 241a, an angle formed by a virtual line connecting the center of curvature and one end and a virtual line connecting the center of curvature and the other end is smaller than 180 degrees. One end of the second turn part 241a is located on an extension line of one second straight part 240.

  In the present embodiment, the radius of curvature of the second turn portion 241 a is the same as the radius of curvature of the second annular gasket arrangement portion 23. That is, the second turn part 241 a overlaps with a part of the second annular gasket arrangement part 23.

  One second connection part 241b of the pair of second connection parts 241b and 241b is connected to one second straight part 240 and one end of the second turn part 241a. In the present embodiment, one second connection portion 241b extends straight. That is, one second connection part 241b is provided on an extension line of one second straight part 240, and is connected to one second straight part 240 and the second turn part 241a.

  On the other hand, the other second connection portion 241b of the pair of second connection portions 241b and 241b is connected to the other second straight portion 240 and the other end of the second turn portion 241a.

  In the present embodiment, the other second connection portion 241b is a first portion 242 including one end in the third direction and the other end opposite to the one end, and one end is connected to the other second straight portion 240. The first part 242 includes a second part 243 connected to the other end of the first part 242 and the other end of the second turn part 241a.

  The first part 242 extends straight in the third direction. That is, the first part 242 is provided on the extension line of the other second straight portion 240. Accordingly, the first part 242 overlaps with the first connection part 221b in the first folded part 221 of the first flow path forming gasket arrangement part 22.

  The second part 243 is a first extension part 243a that is connected to the other end of the second turn part 241a, and includes a first extension part 243a that extends in a direction intersecting the lateral center line CL1, and other parts of the first part 242. A second extending portion 243b extending from the end, and a connecting portion 243c connected to the first extending portion 243a and the second extending portion 243b are included.

  The first extending portion 243a extends in the tangential direction of the second turn portion 241a, and the first extending portion 243a of the first flow path forming gasket arranging portion 22 is disposed on the longitudinal center line (center line of the heat transfer plate 2 extending in the third direction) CL2. It intersects with the other first connecting portion 221b in the folded portion 221.

  The second extending portion 243b is provided in the vicinity of the first opening 20. The second extending portion 243b extends in a direction in which the horizontal center line CL1 extends or in a direction intersecting with the horizontal center line CL1. In the present embodiment, the second extending portion 243b extends in a direction intersecting the horizontal center line CL1. Accordingly, the inclination angle of the second extending portion 243b with respect to the horizontal center line CL1 is set smaller than the inclination angle of the first extending portion 243a with respect to the horizontal center line CL1.

  As described above, since the first part 242 overlaps with the first connection part 221b of the first folded part 221 of the first flow path forming gasket arrangement part 22, the second extension part 243b It extends from a position corresponding to the middle position of one first connecting portion 221b in the first folded portion 221 of the gasket forming portion 22 for forming a path.

  The connecting portion 243c is formed in an arc shape. Here, it is along the outer periphery of the first opening 20. That is, the connecting portion 243c is formed in an arc shape with the center of the first opening 20 as the center of curvature.

  As described above, the second opening 21 has the longitudinal center line (center line extending in the third direction) CL2 of the heat transfer plates 2,. Placed in the area. Accordingly, the pair of second folded portions 241 and 241 are symmetrical with respect to the horizontal center line (center line extending in the second direction) CL1 in the heat transfer plates 2. Thereby, the gasket formation part 24 for 2nd flow-path formation demarcates the trapezoid area | region where the dimension in the 3rd direction became small as it went to the one end side from the other end side in a 2nd direction.

  The first annular gasket placement portion 25 surrounds the first opening 20 in a region outside the region surrounded by the second flow path forming gasket placement portion 24. Each of the pair of first annular gasket arrangement portions 25 corresponds to the shape of the first opening 20. As described above, in the present embodiment, the first opening 20 has a circular shape. Accordingly, the pair of first annular gasket arrangement portions 25 are annular. In the present embodiment, the first annular gasket arrangement portion 25 is concentric with the first opening 20.

  In the present embodiment, the curvature radius of the first annular gasket arrangement portion 25 is the same as the curvature radius of the first turn portion 221 a of the first folded portion 221 of the first flow path forming gasket arrangement portion 22. That is, a part of the first annular gasket arrangement portion 25 overlaps the first turn portion 221 a of the first folded portion 221 of the first flow path forming gasket arrangement portion 22.

  The first flow path forming gasket arrangement portion 22 and the second annular gasket arrangement portion 23 on the first surface S1 are at the same level on the first surface S1. Further, the second flow path forming gasket arrangement portion 24 and the first annular gasket arrangement portion 25 on the second surface S2 are at the same level on the second surface S2.

  Each of the first surface S1 and the second surface S2 of the heat transfer plates 2,..., As shown in FIG. 3 and FIG. A plurality of ridges 26, 27 and ridges 28, 29 are provided in a region overlapping with the region surrounding the gasket arrangement portion 24.

  Further, the first surface S1 of the heat transfer plates 2,... Has a support portion (referred to as a first support portion) 30a provided along the outer periphery of the first flow path forming gasket arrangement portion 22. The second surface S2 has a support portion (referred to as a second support portion) 30b provided along the outer periphery of the second flow path forming gasket placement portion 24.

  The first support portion 30a is a plurality of support convex portions (hereinafter referred to as first support convex portions) 300a protruding in the first direction, and adjacent to the plurality of first support convex portions 300a arranged at intervals. And a plurality of concave portions (hereinafter referred to as first concave portions) 300b provided between the matching first support convex portions 300a.

  The second support portion 30b is a plurality of support convex portions (hereinafter referred to as second support convex portions) 301a protruding in the first direction, and a plurality of second support convex portions 301a arranged at intervals. And a plurality of concave portions (hereinafter referred to as second concave portions) 301b provided between the adjacent second support convex portions 301a.

  In this embodiment, the 1st support convex part 300a is a back side of the 2nd recessed part 301b, and the 1st recessed part 300b is a back side of the 2nd support convex part 301a. Therefore, the 1st support convex part 300a in 1st surface S1 is located between the 2nd support convex parts 301a in 2nd surface S2, and the 2nd support convex part 301a in 2nd surface S2 is 1st surface. It is located between the 1st support convex parts 300a in S1.

  Since the heat transfer plates 2,... Are produced by press molding as described above, the ridges 26 on the first surface S1 correspond to the ridges 29 on the second surface S2, and the recesses on the first surface S1. The strip 28 corresponds to the convex strip 27 on the second surface S2. That is, the ridges 26 on the first surface S1 and the ridges 29 on the second surface S2 are in a front-back relationship, and the ridges 28 on the first surface S1 and the ridges 27 on the second surface S2 are There is a relationship between the front and back.

  The protruding amount of the ridges 26 on the first surface S1 of the heat transfer plates 2,... Is the position (surface) where the first flow path forming gasket arrangement portion 22 and the second annular gasket arrangement portion 23 are on the first surface S1. Is set with reference level. Further, the amount (depth) of the recess 28 on the first surface S1 of the heat transfer plates 2,... Is set on the first flow path forming gasket arranging portion 22 and the second annular gasket arranging portion 23 on the first surface S1. Is set with reference level.

  On the other hand, the protrusion amount of the protrusion 27 on the second surface S2 of the heat transfer plates 2,... Is that of the second flow path forming gasket arrangement portion 24 and the first annular gasket arrangement portion 25 on the second surface S2. A certain position (plane) is set as a reference level. Further, the depression amount (depth) of the recess 29 on the second surface S2 of the heat transfer plates 2,... Is the second flow path forming gasket arrangement portion 24 and the first annular gasket arrangement portion on the second surface S2. A position (plane) with 25 is set as a reference level.

  As shown in FIG. 5, the first surface S <b> 1 of the heat transfer plates 2,... Is a first long ridge extending as a ridge 26 from the vicinity of one first straight portion 220 to the vicinity of the other first straight portion 220. 26a, a plurality of first long ridges 26a provided at intervals in the third direction, and short ridges 26b provided between the first long ridges 26a. In addition, in FIG. 5, the dot is attached | subjected to the highest peak part (high site | part 260a, 260b mentioned later) of the protruding item | line 26 on 1st surface S1.

  Each of the first long ridges 26a and the short ridges 26b is higher than the high portions 260a and 260b in which the protruding amount from the reference level is set to the standard height, and the protruding amounts from the reference level are higher than the high portions 260a and 260b. And low regions 261a and 261b. Here, the “standard height” refers to a state in which the heat transfer plates 2,... Are stacked in the first direction (the support portions 30 a and 30 b of the adjacent heat transfer plates 2 and 2 are supported). It means the height at which the vertices of the ridges 26, 27 of the two heat transfer plates 2, ... are located on a virtual plane extending in the second direction and the third direction.

  The ridges 26 (first elongated ridges 26a) on the first surface S1 of the heat transfer plate 2 are a plurality of linear portions 262a, 263a arranged at intervals in the second direction, and in the second direction. A plurality of linear portions 262a, 263a in which the adjacent linear portions 262a, 263a are displaced in the third direction, an inclined portion 264a connected to the adjacent linear portions 262a, 263a in the second direction, and one end of the linear portion 262a It is the inclination part 265a connected only to a part, Comprising: The inclination part 265a which comprises the edge part of the said protruding item | line 26 (1st elongate protruding item | line 26a) is provided.

  This will be described more specifically. The first elongated ridges 26a on the first surface S1 are a plurality of straight portions (hereinafter referred to as first straight portions) 262a each extending in the second direction, and arranged in series at intervals in the second direction. A plurality of first straight portions 262a that extend in the second direction and are arranged in series at intervals in the second direction (hereinafter referred to as second straight portions) 263a, A plurality of second linear portions 263a disposed at positions corresponding to positions between the first linear portions 262a that are displaced in the three directions and adjacent to each other in the second direction, and the first linear portions 262a that are adjacent to each other. A plurality of inclined portions (hereinafter referred to as connection inclined portions) 264a connected to the end portions and the end portions of the second straight portion 263a are provided.

  Further, the first long ridge 26a is continuous with the end of the first straight portion 262a or the second straight portion 263a as its own end in the second direction adjacent to the first straight portion 220, and the second direction. An inclined portion (hereinafter referred to as an end inclined portion) 265a extending in the intersecting direction is provided.

  The lengths of the first straight portion 262a and the second straight portion 263a in the second direction are set to the same or substantially the same length.

  The interval between the first linear portions 262a adjacent in the second direction is set wider than the length of the second linear portion 263a in the second direction, and the interval between the second linear portions 263a adjacent in the second direction is the first straight line. It is set wider than the length in the second direction of the portion 262a.

  In the present embodiment, the first straight portion 262a has its center in the second direction coincided with the center between the second straight portions 263a adjacent in the second direction, and the second straight portion 263a is adjacent in the second direction. The center in the second direction is made to coincide with the center between the first straight portions 262a.

  Accordingly, the connection inclined portion 264a connected to the end portion of the adjacent first straight portion 262a and the end portion of the second straight portion 263a extends in a direction intersecting the second direction. That is, the distance in the second direction between the two connecting inclined portions 264a connected to both ends of the first straight portion 262a increases as it approaches the second straight portion 263a (away from the first straight portion 262a), and both ends of the second straight portion 263a. The distance in the second direction between the two connecting inclined portions 264a connected to the portion increases as the distance approaches the first straight portion 262a (away from the second straight portion 263a).

  In the present embodiment, the first surface S1 of the heat transfer plates 2,... Is displaced as a first elongated ridge 26a from the first straight portion 262a to the second straight portion 263a on one side in the third direction. The first long ridge 26a and the first long ridge 26a in which the second straight portion 263a is displaced to the other side in the third direction with respect to the first straight portion 262a.

  On the first surface S1 of the heat transfer plates 2,..., The first long ridge 26a in which the second straight portion 263a is displaced to one side in the third direction with respect to the first straight portion 262a, and the first straight portion 262a. On the other hand, the 1st elongate protruding item | line 26a which shifted the position of the 2nd linear part 263a to the other side in a 3rd direction is alternately arrange | positioned in a 3rd direction.

  The first long ridge 26a in which the second straight portion 263a is displaced to one side in the third direction with respect to the first straight portion 262a, and the second straight portion 263a in the third direction with respect to the first straight portion 262a. The first elongated ridges 26a displaced to the other side are arranged symmetrically with respect to a virtual plane passing between them (a virtual plane along a virtual line extending in the second direction).

  Thereby, as for 1st surface S1 of heat-transfer plate 2, ..., the space | interval of the 2nd linear parts 263a of the 1st elongate protruding item | line 26a adjacent in a 3rd direction is wider than the space | interval of 1st linear parts 262a. Increased interval in which the interval between the first linear portions 262a of the first elongated protrusions 26a adjacent in the third direction is wider than the interval between the second linear portions 263a. Part (not numbered).

  Each of the first straight portion 262a and the second straight portion 263a includes a high portion 260a and a low portion 261a. Specifically, each of the first straight portion 262a and the second straight portion 263a of the first elongated protrusion 26a includes a low portion 261a and a high portion 260a disposed on both sides of the low portion 261a in the second direction. Including.

  In the present embodiment, the first surface S1 of the heat transfer plates 2,... Is a plurality of first long ridges 26a with different numbers of low portions 261a of the first straight portions 262a and the second straight portions 263a. It has the 1st elongate protruding item | line 26a of a kind (refer FIG. 3).

  Specifically, the first surface S1 of the heat transfer plates 2,... Is a first long ridge 26a in which the second straight portion 263a is displaced to one side in the third direction with respect to the first straight portion 262a. The first long ridge 26a including the first straight portion 262a including one low portion 261a and the second straight portion 263a including two low portions 261a, the first straight portion 262a including two low portions 261a, and one And a first elongated protrusion 26a including a second straight portion 263a including a low portion 261a.

  Further, the first surface S1 of the heat transfer plates 2,... Is a single first long ridge 26a in which the second straight portion 263a is displaced to the other side in the third direction with respect to the first straight portion 262a. A first elongated protrusion 26a including a first straight portion 262a including a low portion 261a and a second straight portion 263a including one low portion 261a, a first straight portion 262a including two low portions 261a, and two low portions 261a And a first elongated ridge 26a including a second straight portion 263a including the first straight ridge 26a.

  And one low site | part on the one side of a 3rd direction with respect to the 1st elongate protruding item | line 26a containing the 1st linear part 262a containing the one low part 261a and the 2nd straight part 263a containing the two low parts 261a The 1st elongate protruding item | line 26a containing the 1st linear part 262a containing 261a and the 2nd linear part 263a containing one low part 261a is adjacent. In addition, two low sites on the other side in the third direction with respect to the first elongated protrusion 26a including the first straight portion 262a including one low portion 261a and the second straight portion 263a including two low portions 261a. The 1st elongate protruding item | line 26a containing the 1st linear part 262a containing 261a and the 2nd linear part 263a containing the two low parts 261a is adjacent.

  Furthermore, two low parts are provided on one side in the third direction with respect to the first elongated protrusion 26a including the first straight part 262a including the two low parts 261a and the second straight part 263a including the single low part 261a. The 1st elongate protruding item | line 26a containing the 1st linear part 262a containing 261a and the 2nd linear part 263a containing the two low parts 261a is adjacent. In addition, one low site on the other side in the third direction with respect to the first elongated ridge 26a including the first straight portion 262a including the two low portions 261a and the second straight portion 263a including the one low portion 261a. The 1st elongate protruding item | line 26a containing the 1st linear part 262a containing 261a and the 2nd linear part 263a containing one low part 261a is adjacent.

  The short ridge 26b extends in the second direction. That is, the short ridges 26b themselves constitute straight portions. The short ridges 26b are arranged in the interval enlarged portion.

  As described above, since each of the first straight portion 262a and the second straight portion 263a of the first long ridge 26a includes the low portion 261a, the short ridge 26b correspondingly includes the high portion 260b and the low portion 261b. Including. In the present embodiment, the first surface S1 of the heat transfer plates 2,... Includes, as the short ridges 26b, short ridges 26b including one low portion 261b and short ridges 26b including two low portions 261b. Have.

  The short ridge 26b including one low portion 261b is provided between the first straight portions 262a including two low portions 261a (interval enlarged portion) and between the second straight portions 263a including two low portions 261a (interval enlarged portion). The short ridge 26b that is arranged and includes two low portions 261b includes a first straight portion 262a (interval enlarged portion) including one low portion 261a and a second straight portion 263a (interval enlarged portion) including one low portion 261a. Placed in.

  Thereby, in the 1st surface S1 of the heat-transfer plate 2, ..., one low part 261a provided in the 1st linear part 262a in the 1st elongate protrusion 26a and one low part provided in the short protrusion 26b 261b are arranged in a line, and one low part 261a provided in the second straight portion 263a and one low part 261b provided in the short ridge 26b in the first long ridge 26a are arranged in a line. Further, on the first surface S1 of the heat transfer plates 2,..., The two low portions 261a provided on the first straight portion 262a and the two low portions 261b provided on the short ridge 26b of the first long ridge 26a. Are arranged in two rows, and the two low portions 261a provided in the second straight portion 263a and the two low portions 261b provided in the short projection 26b are arranged in two rows.

  Thereby, while the low site | part 261a of the 1st elongate protruding item | line 26a adjacent in a 3rd direction shifts in position in a 2nd direction, the 1st elongate protruding item | line 26a and the elongate protruding item | line 26b adjacent in a 3rd direction, The low portions 261a and 261b are arranged so as to be displaced in the second direction.

  As shown in FIG.6 and FIG.7, in each of the 1st elongate ridge 26a (the 1st linear part 262a, the 2nd linear part 263a) and the short ridge 26b which are the protrusions 26 on 1st surface S1, it is a low site | part. 261a and 261b are the width dimension (W) in the second direction at the low portions 261a and 261b, and the height difference (d) in the first direction between the top of the high portions 260a and 260b and the top of the low portions 261a and 261b. The ratio (W / d) is 2 or more.

  The back side of the ridges 26 (the first long ridges 26a and the short ridges 26b) on the first surface S1 of the heat transfer plates 2, ... are concave ridges 29 on the second surface S2. Accordingly, as the low portions 261a and 261b are provided on the first long ridge 26a and the short ridge 26b, the first long ridge 26a and the short ridge 26b are formed on the back side of the first surface S1. The concave portion 29 on the second surface S2 is formed with a deep portion and a shallow portion. That is, the concave stripes 29 on the second surface S2 on the back side of the high portions 260a, 260b of the first long ridges 26a (the first straight portions 262a, the second straight portions 263a) become deep portions, On the long ridge 26a (first straight part 262a, second straight part 263a), the concave line 29 on the second surface S2 which is the back side of the low part 261a, 261b is a shallow portion.

  Returning to FIG. 5, the connecting inclined portion 264 a of the first long ridge 26 a is configured to be able to abut against the adjacent heat transfer plates 2,... (First surface S <b> 1 in the present embodiment). Moreover, the edge part inclination part 265a of the 1st elongate protruding item | line 26a is comprised so that it can contact | abut with respect to the adjacent heat-transfer plate 2, ... (1st surface S1 in this embodiment).

  Specifically, as shown in FIGS. 5 and 8, the end inclined portion 265a is set so that the amount of protrusion from the reference level is the same as or substantially the same as the high portion 260a of the first straight portion 262a and the second straight portion 263a. A high portion (hereinafter, referred to as an end high portion) 267a, and a relief portion 267b adjacent to the end high portion 267a, which includes a relief portion 267b that protrudes from the reference level less than the end high portion 267a. . The end inclined portion 265a intersects with the end inclined portion 265a on the first surface S1 of the adjacent heat transfer plates 2,... (See FIG. 16).

  On the premise of this, the escape portion 267b is disposed at the intersection of the opposing heat transfer plates 2,... With the end inclined portion 265a in the end inclined portion 265a. Accordingly, the end high portion 267a is disposed on both sides of the relief portion 267b.

  The protruding amount of the escape portion 267b from the reference level in the end inclined portion 265a is set in consideration of the deflection amount of the heat transfer plates 2,. That is, as shown in FIG. 8, the height difference d1 in the first direction between the end height portion 267a and the escape portion 267b on both sides of the escape portion 267b is the relief of the end inclined portion 265a of the heat transfer plate 2,. This corresponds to the amount of deflection at a certain portion of the portion 267b.

  In the present embodiment, the heat transfer plates 2 adjacent to each other in the first direction support each other at both end portions in the second direction (support portions 30a and 30b outside the pair of first straight portions 220). . That is, the heat transfer plates 2 are supported at both ends in the second direction.

  Thereby, when the pressure from the 2nd surface S2 side acts, the heat-transfer plate 2, ... uses the support part 30a in the outer side of 1st flow path Ra and 2nd flow path Rb in a 2nd direction as a fulcrum. Bend. The amount of deflection of the heat transfer plates 2,... (Shift amount in the first direction) varies depending on the distance from the support portion 30a, and the amount of deflection at each position is proportional to the amount of separation from the support portions 30a, 30b.

  Therefore, the relief portion 267b in the end inclined portion 265a is set lower than the high portion 260a of the first straight portion 262a and the second straight portion 263a according to the amount of deflection of the heat transfer plates 2,. That is, the relief portion 267b in the end inclined portion 265a avoids interference with the opposite end inclined portion 265a in a normal state.

  As shown in FIGS. 5 and 9, the connection inclined portion 264 a has a high portion (hereinafter, referred to as “high portion” in which the amount of protrusion from the reference level is set to be the same or substantially the same as the high portion 260 a of the first straight portion 262 a and the second straight portion 263 a. 268a, and a relief portion 268b adjacent to the connection height portion 268a, and a relief amount 268b having a protruding amount from the reference level smaller than that of the connection height portion 268a. The connection inclined portion 264a intersects with the connection inclined portion 264a on the first surface S1 of the adjacent heat transfer plates 2,... (See FIG. 17).

  On the premise of this, in the connection inclined portion 264a, the escape portion 268b is disposed at the intersection of the opposing heat transfer plates 2,... With the connection inclined portion 264a. Accordingly, the connection height portions 268a are disposed on both sides of the relief portion 268b.

  The amount of protrusion of the relief portion 268b from the reference level in the connection inclined portion 264a is set in consideration of the amount of deflection of the heat transfer plates 2,. That is, as shown in FIG. 9, the height difference d2 in the first direction between the connection height portion 268a and the escape portion 268b on both sides of the escape portion 268b is the relief portion 268b of the connection inclined portion 264a of the heat transfer plate 2,. This corresponds to the amount of deflection in a certain part.

  In the present embodiment, the heat transfer plates 2 that are adjacent in the first direction are, as described above, the two end portions in the second direction (the support portions 30a and 30b on the outside of the pair of first straight portions 220). The heat transfer plates 2, ... are outside the first flow path Ra and the second flow path Rb in the second direction when an action of pressure from the second surface S2 side occurs. The support portions 30a and 30b are bent as fulcrums. The amount of deflection (displacement amount in the first direction) of the heat transfer plates 2,... Varies depending on the separation distance from the support portion 30a, and the deflection amount at each position is proportional to the separation amount from the support position.

  Therefore, the relief portion 268b in the connection inclined portion 264a is set lower than the connection height portion 268a according to the amount of deflection of the heat transfer plates 2,.

  The connection inclined portion 264a is present on the inner side in the second direction than the end inclined portion 265a. Accordingly, the portion of the heat transfer plate 2 that has the connection inclined portion 264a has a larger amount of deflection than the portion of the end inclined portion 265a.

  Therefore, the escape portion 268b of the connection inclined portion 264a is set lower than the escape portion 267b of the end inclined portion 265a. That is, the height difference (depth) d2 in the first direction between the connection height portion 268a on both sides of the relief portion 268b and the relief portion 268b of the connection slope portion 264a is the same as the end height portion 267a in the end slope portion 265a. The height difference (depth) d1 in the first direction between the end inclined portion 265a and the relief portion 267b is larger (deeper).

  Thereby, the escape part 268b in the connection inclination part 264a avoids interference with the connection inclination part 264a which opposes normally.

  The ridges 26 on the first surface S1 of the heat transfer plates 2, ... are as described above, and the first surface S1 of the heat transfer plates 2, ... is between the first elongated ridges 26a arranged in the third direction. In addition, a recess 28 is provided between the first long protrusion 26a and the short protrusion 26b arranged in the third direction. And the protrusion 26 (1st elongate protrusion 26a, short elongate line 26b) of 1st surface S1 of heat-transfer plate 2, ... forms the recess 29 in 2nd surface S2 of heat-transfer plate 2, .... And the concave strip 28 of the first surface S1 forms the convex strip 27 of the second surface S2 of the heat transfer plates 2.

  Specifically, as shown in FIG. 10, the second surface S2 of the heat transfer plates 2,... According to the present embodiment is formed as a ridge 27 from the vicinity of one second straight portion 240 to the other second straight portion. It has the 2nd elongate protruding item | line 27 extended to the vicinity of 240. FIG. In addition, in FIG. 10, the dot is attached | subjected to the highest top part (high part 273a mentioned later) of the protruding item | line 27 on 2nd surface S2.

  The second elongate ridge 27 is a straight line portion (hereinafter referred to as a series straight line portion) 270 extending in the second direction, and the second straight line portions 270 arranged at intervals in the second direction are each second. A pair of straight portions (hereinafter referred to as parallel straight portions) 271 that extend in the direction and are spaced apart in the third direction, and are arranged between series straight portions 270 that are adjacent in the second direction. The linear part 271 is provided with the branch part 272 which connects the serial linear part 270 adjacent to a 2nd direction, and a pair of parallel linear part 271. FIG.

  The lengths in the second direction of the series straight portions 270 and the parallel straight portions 271 are set to the same or substantially the same length.

  The interval between the series linear portions 270 adjacent in the second direction is set wider than the length of the parallel linear portion 271 in the second direction, and the interval between the parallel linear portions 271 adjacent in the second direction is the series linear portion 270. Is set wider than the length in the second direction.

  In this embodiment, the series straight line portion 270 matches the center of its second direction with the center between the parallel straight line portions 271 adjacent in the second direction, and the parallel straight line portion 271 is adjacent to the series straight line in the second direction. The center of the second direction is made to coincide with the center between the parts 270.

  The branch portion 272 includes a pair of inclined portions (hereinafter referred to as branch inclined portions) 272a and 272a extending in a direction inclined with respect to the second direction. That is, the branch portion 272 includes a branch slope portion 272 a that connects the series straight portion 270 and one parallel straight portion 271, and a branch slope portion 272 a that connects the series straight portion 270 and the other parallel straight portion 271. Each of the pair of branch inclined portions 272a and 272a is symmetrical with respect to a virtual plane along a virtual line extending in the second direction through the series linear portion 270, and extends in a direction intersecting the horizontal center line CL1. .

  Thereby, the space | interval of the 2nd direction of branch inclination part 272a, 272a connected to the both ends of one parallel linear part 271 spreads as it approaches the series linear part 270 (it moves away from one parallel linear part 271), and the other parallel The distance between the two branch inclined portions 272a and 272a connected to the straight line portion 271 in the second direction increases as the series straight line portion 270 is approached (away from the other parallel straight line portion 271).

  On the second surface S2 of the heat transfer plates 2,..., The second long ridges 27 adjacent in the third direction are arranged with their parallel straight portions 271 shifted in the second direction.

  In other words, the series straight line portion 270 of one second long protruding line 27 among the second long protruding lines 27 adjacent in the third direction is a pair of parallel straight line parts 271 of the other second long protruding line 27. A pair of second long ridges 27 of the second long ridges 27 of the second long ridges 27 that are arranged in the third direction and are spaced apart from each other in parallel with each other in the third direction. The other parallel straight line portion 271 of the parallel straight line portions 271 is arranged with a space in the third direction with respect to the serial straight line portion 270 of the other second elongated protrusion 27.

  In the 2nd elongate protruding item | line 27, each of the serial linear part 270 and a pair of parallel linear part 271 contains the high site | part 273a and the low site | part 273b. Specifically, each of the series straight part 270 and the pair of parallel straight parts 271 includes a low part 273b and a high part 273a arranged on both sides of the low part 273b in the second direction.

  Moreover, in this embodiment, the 2nd surface S2 of the heat-transfer plate 2, ... made the number of the low part 273b of the series linear part 270 and a pair of parallel linear part 271 different as the 2nd elongate protruding item | line 27. A plurality of types of second elongated ridges 27 are provided (see FIG. 4).

  Specifically, the second surface S2 of the heat transfer plates 2,..., As the second elongated ridge 27, the series straight portion 270 including one low portion 273b and one parallel straight line including two low portions 273b. Part 271 and the second elongated ridge 27 including the other parallel straight part 271 including one low part 273b, the series straight part 270 including two low parts 273b, and one including two low parts 273b It includes a second long ridge 27 including the parallel straight portion 271 and the other parallel straight portion 271 including one low portion 273b, a serial straight portion 270 including two low portions 273b, and one low portion 273b. One parallel straight part 271 and the second long protruding line 27 including the other parallel straight part 271 including the two low parts 273b, the series straight part 270 including one low part 273b, and the one low part 273b. Including Parallel linear portions 271 and has a second elongate ridge 27 including the other of the parallel straight portions 271 comprising two low portions 273b.

  On the premise of this, a second straight line portion 270 including a series straight portion 270 including one low portion 273b, one parallel straight portion 271 including two low portions 273b, and the other parallel straight portion 271 including one low portion 273b. One side of the long ridge 27 in the third direction includes a series straight part 270 including one low part 273b, one parallel straight part 271 including one low part 273b, and two low parts 273b. The 2nd elongate protruding item | line 27 containing the other parallel linear part 271 is arrange | positioned.

  A second elongated ridge 27 including a series straight portion 270 including one low portion 273b, one parallel straight portion 271 including two low portions 273b, and the other parallel straight portion 271 including one low portion 273b. On the other side in the third direction, a series straight line portion 270 including two low portions 273b, one parallel straight portion 271 including two low portions 273b, and the other parallel straight portion including one low portion 273b A second elongated ridge 27 including 271 is disposed.

  That is, the second long convex portion including the series straight portion 270 including two low portions 273b, one parallel straight portion 271 including two low portions 273b, and the other parallel straight portion 271 including one low portion 273b. On one side of the third direction of the strip 27, a series straight portion 270 including one low portion 273b, one parallel straight portion 271 including two low portions 273b, and the other parallel including one low portion 273b. The 2nd elongate protruding item | line 27 containing the linear part 271 is arrange | positioned.

  Along with this, a second straight line including a series straight line part 270 including two low parts 273b, one parallel straight part 271 including two low parts 273b, and the other parallel straight part 271 including one low part 273b. On the other side of the third ridge 27 in the third direction, the series straight portion 270 including two low portions 273b, one parallel straight portion 271 including one low portion 273b, and the other including two low portions 273b. The second long ridges 27 including the parallel straight portions 271 are arranged.

  Thereby, on the second surface S2 of the heat transfer plates 2,..., One low portion 273b provided in the series straight portion 270 and one low portion 273b provided in the parallel straight portion 271 are arranged in a line and in series. Two low parts 273b provided in the straight part 270 and two low parts 273b in parallel straight part 271 are arranged in two rows.

  Thereby, the low site | part 273b of the 2nd elongate protruding item | line 27 adjacent in the 3rd direction is the arrangement | positioning shifted in the 2nd direction.

  Also on the second surface S2 of the heat transfer plates 2,..., Each low portion 273b has a width dimension (W) in the second direction at the low portion 273b and the high portion 273a, as shown in FIGS. It is formed so that the ratio (W / d) of the height difference (d) in the first direction between the top and the top of the low portion 273b is 2 or more.

  The back side of the ridge (second elongated ridge) 27 on the second surface S2 of the heat transfer plate 2, ... is a ridge 28 on the first surface S1. Therefore, as described above, as the low portion 273b is provided in the second elongated ridge 27 (the series linear portion 270 and the parallel linear portion 271), the concave portion 28 of the first surface S1 has a deep portion. And a shallow portion are formed. That is, the recess 28 on the first surface S1 which is the back side of the high portion 273a on the second elongated projection 27 (the series linear portion 270 and the parallel linear portion 271) becomes a deep portion, and the second elongated projection The groove 28 on the first surface S1 which is the back side of the low portion 273b on the strip 27 (the series straight portion 270 and the parallel straight portion 271) is a shallow portion.

  And in the 2nd surface S2 of heat-transfer plate 2, ..., the concave strip 29 is formed between the several 2nd elongate convex strip 27 arranged in a 3rd direction. The concave stripes 29 on the second surface S2 of the heat transfer plates 2,... Are the back side of the convex stripes 26 (first long convex stripes 26a, short convex stripes 26b) on the first surface S1.

  In this embodiment, as shown in FIG. 2, the plate-type heat exchanger 1 is used as an endless annular first flow path forming member disposed in the first flow path forming gasket disposing portion 22 as gaskets 3, 4, 5, and 6. The gasket 3, the endless second annular gasket 4 disposed in the second annular gasket placement portion 23, and the endless annular second passage formation gasket 5 disposed in the second passage formation gasket placement portion 24. And an endless annular first annular gasket 6 disposed in the first annular gasket disposing portion 25.

  As shown in FIG. 13, the first flow path forming gasket 3 defines a first flow path Ra through which the first fluid A flows in the third direction between the first surfaces S1 of the adjacent heat transfer plates 2,. The first flow path forming seal line is configured. The first flow path forming gasket 3 is formed in accordance with the form of the first flow path forming gasket arrangement portion 22. That is, the first flow path forming gasket 3 includes a pair of straight seal portions (hereinafter referred to as first straight seal portions) 31 corresponding to the pair of first straight portions 220 of the first flow path forming gasket arrangement portion 22, and a pair of And a pair of folded seal portions (hereinafter referred to as first folded seal portions) 32 corresponding to the first folded portion 221.

  Specifically, the first flow path forming gasket 3 includes a pair of first straight seal portions 31 each extending in the third direction and having both end portions located at the boundary between the main heat transfer region A1 and the end region A2. And it has a pair of 1st straight seal | sticker part 31 spaced apart in the 2nd direction, and a pair of 1st return | turnback seal | sticker part 32 connected with the corresponding edge part of a pair of 1st straight seal part 31.

  The first folded seal portion 32 extends from each of the turn seal portion (hereinafter referred to as the first turn seal portion) 320 surrounding a part of the outer periphery of the first opening 20 and both ends of the first turn seal portion 320. And a pair of connection seal portions (hereinafter referred to as first connection seal portions) 321 connected to the first straight seal portion 31.

  The first turn seal portion 320 is formed along a part of the outer periphery of the first opening 20. In this embodiment, since the 1st opening 20 is made into circular shape, the 1st turn seal part 320 is made into circular arc shape. Accordingly, the first turn seal part 320 has one end in the circumferential direction and the other end opposite to the one end.

  In the first flow path forming gasket 3, one first connection seal part 321 of the pair of first connection seal parts 321 of the first folded seal part 32 extends on an extension line of the one first straight seal part 31. And connected to one end of the first turn seal part 320. On the other hand, the other first connection seal part 321 of the pair of first connection seal parts 321 of the first folded seal part 32 in the first flow path forming gasket 3 is connected to the other end of the first turn seal part 320. It connects with the edge part of the other 1st straight seal part 31 in the boundary of main heat transfer area | region A1 and edge part area | region A2. The other first connection seal part 321 of the pair of first connection seal parts 321 of the first folded seal part 32 in the first flow path forming gasket 3 is formed in an arc shape that protrudes outward. Has been.

  The other first straight seal portion 31 of the first flow path forming gasket 3 extends in a tangential direction with respect to the other first connection seal portion 321 of the first folded seal portion 32 in the first flow path forming gasket 3. .

  The second annular gasket 4 constitutes an annular seal line surrounding the second opening 21. The second annular gasket 4 is formed according to the form of the second annular gasket arrangement portion 23.

  In this embodiment, since the 2nd annular gasket arrangement | positioning part 23 is formed in an annular | circular shape, the 2nd annular gasket 4 is also formed in an annular | circular shape.

  As shown in FIG. 14, the second flow path forming gasket 5 defines a second flow path Rb through which the second fluid B flows in the third direction between the second surfaces S2 of the adjacent heat transfer plates 2,. The second flow path forming seal line is configured. The second flow path forming gasket 5 is formed in accordance with the form of the second flow path forming gasket arrangement portion 24.

  More specifically, each of the second flow path forming gaskets 5 extends in the third direction and has a pair of straight seal portions (hereinafter referred to as both ends) located at the boundary between the main heat transfer region A1 and the end region A2. A pair of second straight seal portions 51 spaced apart in the second direction and a pair of folded seals connected to corresponding ends of the pair of second straight seal portions 51. Part (hereinafter referred to as a second folded seal part) 52.

  The second folded seal portion 52 of the second flow path forming gasket 5 includes a turn seal portion (hereinafter referred to as a second turn seal portion) 520 surrounding a part of the outer periphery of the second opening 21, and the second turn seal portion. And a pair of connection seal portions (hereinafter referred to as second connection seal portions) 521 that extend from both ends of 520 and connect to the corresponding second straight seal portions 51.

  The second turn seal portion 520 is formed along a part of the outer periphery of the second opening 21. In this embodiment, since the 2nd opening 21 is made into circular shape, the 2nd turn seal part 520 is made into circular arc shape. Accordingly, the second turn seal portion 520 has one end in the circumferential direction and the other end opposite to the one end.

  One second connection seal portion 521 of the pair of second connection seal portions 521 of the second folded seal portion 52 in the second flow path forming gasket 5 extends on an extension line of the one second straight seal portion 51. And connected to one end of the second turn seal portion 520.

  The other second connection seal portion 521 of the pair of second connection seal portions 521 of the second folded seal portion 52 in the second flow path forming gasket 5 is a first seal portion 522 having one end and the other end. A first seal portion extending on an extension line of the second straight seal portion 51 with one end connected to the end portion of the other second straight seal portion 51 at the boundary between the main heat transfer region A1 and the end portion region A2. 522, and a second seal portion 523 connected to the other end of the second turn seal portion 520 and the other end of the first seal portion 522.

  The second seal part 523 is a first extension seal part 523a extending in a direction intersecting the horizontal center line CL1, and the first extension seal part 523a connected to the other end of the second turn seal part 520, It includes a second extended seal portion 523b extending from the other end of the first seal portion 522, and a connecting seal portion 523c connected to the first extended seal portion 523a and the second extended seal portion 523b.

  The inclination angle of the second extending seal portion 523b with respect to the lateral center line CL1 is set smaller than the inclination angle of the first extending seal portion 523a with respect to the lateral center line CL1. In the present embodiment, the second extending seal portion 523 b is provided in the vicinity of the first opening 20. In the present embodiment, the connection seal portion 523 c is formed in an arc shape along the outer periphery of the first opening 20.

  The first annular gasket 6 constitutes an annular seal line surrounding the first opening 20. The first annular gasket 6 is formed according to the form of the first annular gasket arrangement portion 25.

  In the present embodiment, since the first annular gasket arrangement portion 25 is formed in an annular shape, the first annular gasket 6 is also formed in an annular shape.

  As shown in FIG. 13, the first flow path forming gasket 3 and the second annular gasket 4 are arranged on the same surface (first surface S1) of the heat transfer plates 2,. As shown in FIG. 14, the first annular gasket 6 is arranged on the same surface (first surface S1 or second surface S2) of the heat transfer plates 2,.

  In the present embodiment, each of the first flow path forming gasket 3 and the second annular gasket 4 is independent. Further, each of the second flow path forming gasket 5 and the first annular gasket is independent.

  The heat transfer plates 2,... And the gaskets 3, 4, 5, 6 are as described above. In the plate heat exchanger 1 according to this embodiment, a plurality of the heat transfer plates 2,. . At this time, the plurality of heat transfer plates 2,... Have heat transfer plates 2,... With the first surface S1 facing one side in the first direction, and the heat transfer plates 2, with the second surface S2 facing one side in the first direction. The heat plates 2 are arranged alternately.

  In the present embodiment, the plurality of heat transfer plates 2 are in the same form. Accordingly, the plurality of heat transfer plates 2,... Are reversed 180 degrees around the axis extending in the second direction every other direction (in the first direction) in the overlapping direction.

  And between the heat transfer plates 2,... Adjacent to each other in the first direction and the first surfaces S1 are opposed to each other, the first flow path forming gasket 3 and the second annular gasket 4 are interposed. Is placed. That is, the first flow path forming gasket 3 is disposed between the first flow path forming gasket placement portions 22 of the opposed heat transfer plates 2,..., And the second annular gasket 4 is disposed between the opposed heat transfer plates 2,. It arrange | positions between the 2nd annular gasket arrangement | positioning parts 23. FIG.

  Further, between the heat transfer plates 2,... Adjacent to each other in the first direction, the second flow path forming gasket 5 and the first annular gasket between the heat transfer plates 2,. 6 is arranged. That is, the second flow path forming gasket 5 is disposed between the second flow path forming gasket placement portions 24 of the opposed heat transfer plates 2..., And the first annular gasket 6 is disposed between the opposed heat transfer plates 2 and 2. It arrange | positions between the 1st cyclic | annular gasket arrangement | positioning parts 25 of ....

  In this state, a pair of end plates 7, 7 are arranged on both sides of the plurality of heat transfer plates 2, superimposed in the first direction, and the pair of end plates 7, 7 are interposed via the fastening members 8,. And concluded. As a result, the plurality of heat transfer plates 2 are tightened in the first direction. In this state, the first support convex portion 300a of the first surface S1 of the one heat transfer plate 2 of the heat transfer plates 2 adjacent in the first direction is the first of the first surface S1 of the other heat transfer plate 2. The second support convex portion 301a of the second surface S2 in one heat transfer plate 2 of the heat transfer plates 2 that are in contact with the one support convex portion 300a and adjacent in the first direction is the second heat transfer plate 2 in the second heat transfer plate 2. It contacts the second support convex portion 301a of the two surfaces S2 (see FIG. 18). Therefore, the heat transfer plates 2, 2 adjacent in the first direction are supported outside the region surrounded by the first flow path forming gasket 3 and outside the region surrounded by the second flow path forming gasket 5. It will be in the state mutually supported by the part 30a.

  In addition to this, as shown in FIG. 13, the first flow in which the region surrounded by the first flow path forming gasket 3 circulates the first fluid A between the heat transfer plates 2,. It becomes road Ra. That is, the flow path width in the second direction expands in the second direction from the first opening 20 toward the main heat transfer region A1 in the end regions A2, A2 of the heat transfer plates 2, ... and in the main heat transfer region A1. A first flow path Ra that is maximized is formed.

  In addition, between the heat transfer plates 2,... Facing the first surfaces S1, the area surrounded by the second annular gasket 4 is separated from the first flow path Ra, and the second inflow path Rb1 and the second outflow path. Rb2.

  Further, as shown in FIG. 14, the second flow in which the region surrounded by the second flow path forming gasket 5 circulates the second fluid B between the heat transfer plates 2,. It becomes road Rb. That is, the flow path width in the second direction expands in the second direction from the second opening 21 toward the main heat transfer area A1 in the end areas A2, A2 of the heat transfer plates 2, ... and in the main heat transfer area A1. A second flow path Rb that is maximized is formed.

  In addition, between the heat transfer plates 2,... Facing the second surfaces S2, the area surrounded by the first annular gasket 6 is separated from the second flow path Rb and the first inflow path Ra1 and the first outflow path. Ra2.

  In this state, as shown in FIG. 15, in the region defining the first flow path Ra, the first straight portions 262 a in the first long ridges 26 a of the heat transfer plates 2,. The second straight portion 263a overlaps the concave stripes 28 of the heat transfer plates 2,... (The other party) facing each other when viewed from the first direction, and is a short projection on the heat transfer plates 2,. The strip 26b overlaps with the concave strip 28 of the other party when viewed from the first direction. That is, in the area | region which demarcates a 1st flow path, the 1st linear part 262a and the 2nd linear part 263a in the 1st elongate protruding item | line 26a are with respect to the groove 28 of the opposing heat-transfer plate 2, ... (the other party). Overlapping at an interval in the first direction.

  On the other hand, as shown in FIG. 16, in the region defining the first flow path Ra, the end inclined portion 265a of the heat transfer plate 2,... Intersect. Further, as shown in FIG. 17, the connection inclined portion 264a intersects with the connection inclined portion 264a of the heat transfer plates 2,.

  In the present embodiment, the relief portion 267b is provided at the intersection between the end inclined portions 265a, and the relief portion 268b is provided at the intersection between the connection inclined portions 264a. Therefore, as shown in FIG. The heat transfer plates 2 that are adjacent to each other with the surfaces S1 facing each other are in non-contact with each other in a region that defines the first flow path Ra.

  However, since the relief portions 267b and 268b are set to a height that takes into account the amount of bending of the heat transfer plate 2, no fluid pressure is applied in the first flow path Ra, or in the first flow path Ra. When the fluid pressure is smaller than the fluid pressure in the second flow path Rb, the heat transfer plate 2 is pushed and bent toward the first surface S1, and the first surfaces S1 are opposed to each other as shown in FIG. The escape portions 267b of the end inclined portions 265a of the mating heat transfer plates 2 come into contact with each other, and the escape portions 268b of the connection inclined portions 264a come into contact with each other.

  That is, when the fluid pressure is not acting in the first channel Ra, or when the fluid pressure in the first channel Ra is smaller than the fluid pressure in the second channel Rb, the first surfaces S1 are opposed to each other. The end inclined portion 265a and the connecting inclined portion 264a of the adjacent heat transfer plates 2 support each other.

  Returning to FIG. 15, in the region demarcating the second flow path Rb, the serial straight line portion 270 and the parallel straight line portion 271 of the second long ridges 27 of the heat transfer plates 2,. Is overlapped with the concave stripes 29 of the heat transfer plates 2,. That is, in the area | region which demarcates a 2nd flow path, the serial linear part 270 and the parallel linear part 271 in the 2nd elongate protruding item | line 27 are with respect to the recessed item | line 29 of the opposing heat-transfer plate 2, ... (the other party). Overlapping at an interval in the first direction.

  On the other hand, in the region that defines the second flow path Rb, the serial linear portion 270 of the heat transfer plates 2,... (The other party) with which the branch portions 272 (branch inclined portions 272a and 272a) face each other when viewed from the first direction. , The parallel straight part 271 or the branch part 272 (cross-abutting with the branch inclined parts 272a and 272a). That is, the heat transfer plates 2 that are adjacent to each other with the second surface S2 facing each other support each other.

  In the plate heat exchanger 1 configured as described above, as shown in FIGS. 13 and 14, the first fluid A supplied to the first inflow channel Ra1 flows through the first channel Ra in the third direction, It flows out from one outflow channel Ra2. On the other hand, the second fluid B supplied to the second inflow path Rb1 flows out of the second outflow path Rb2 after flowing through the second flow path Rb in the third direction. Since the first flow path Ra and the second flow path Rb are partitioned by the heat transfer plates 2,..., The first fluid A flowing through the first flow path Ra and the second fluid B flowing through the second flow path Rb are: Heat is exchanged through the heat transfer plates 2.

  As described above, the plate heat exchanger 1 according to this embodiment includes a plurality of heat transfer plates 2,... Having a first surface S1 and a second surface S2 opposite to the first surface S1 in the first direction. The first surface S1 of each of the plurality of heat transfer plates 2,... Is elongated in the second direction orthogonal to the first direction. A plurality of ridges 26 (26a, 26b) and recesses 28 formed, and a plurality of ridges 26 (26a, 26b) and recesses alternately formed in a third direction orthogonal to the first direction and the second direction. The second surface S2 of each of the plurality of heat transfer plates 2,... Has a groove 28 and a first surface S1 that are in a front-to-back relationship with the protrusion 26 (26a, 26b) of the first surface S1. Of the first surface S1 of the heat transfer plate 2,... (26a, 26b) and each of the ridges 27 on the second surface S2 extend in a direction including the second direction or the second direction orthogonal to the first direction as a component, and include the second direction or the second direction as a component. A plurality of linear portions 262a, 263a, 26b, 270, 271 arranged at intervals in the direction, each of which is adjacent in the second direction or the direction including the second direction as a component, 262a, 263a, 26b , 270, 271 includes a plurality of linear portions 262a, 263a, 26b, 270, 271 that are displaced in the second direction or the direction perpendicular to the direction including the second direction as a component, and a plurality of heat transfer plates 2, Each of the first surfaces S1 of the heat transfer plates 2,... Adjacent to the straight portions 262a, 263a, 26b of the ridges 26 (26a, 26b) on the first surface S1 of the respective sides on one side in the first direction. Concave groove 8 and 29, the first surface S1 of its own is opposed to the first surface S1 of the adjacent heat transfer plates 2,... On one side in the first direction with a gap in the first direction. The first flow path Ra for circulating the first fluid A in the third direction is formed between the heat transfer plates 2 adjacent to each other on one side in the first direction, and the second surface S2 of the first flow path is formed in the first direction. The second fluid B flows in the third direction between the heat transfer plates 2 adjacent to each other on the other side and the second surface S2 and between the heat transfer plates 2 adjacent on the other side in the first direction. The straight portions 270, 271 of the ridges 27 on the second surface S2 of the heat transfer plates 2,. The most protruding high portion 273a and the protruding amount in the first direction are the low portion 273b lower than the high portion 273a. And at least one low portion 273b aligned with the high portion 273a in the extending direction of the straight portions 270 and 271.

  According to the said structure, 1st flow path Ra which distribute | circulates the 1st fluid A to a 3rd direction between 1st surface S1 in the 1st direction, and adjoins the heat-transfer plates 2, ... is formed, and the 1st A second flow path Rb for allowing the second fluid B to flow in the third direction is formed between the adjacent heat transfer plates 2,. And each of several heat-transfer plate 2 ... heat-transfer which adjoins linear part 262a, 263a, 26b of the protruding item | line 26 (26a, 26b) on own 1st surface S1 on the one side of a 1st direction. With the plate 2,... And the recess 28 of the first surface S1, along the first surface S1 of the heat transfer plate 2,... Adjacent to the first surface S1 on one side in the first direction. Since they are opposed to each other with a gap in the first direction, there is no contact between the heat transfer plates 2,... Forming the first flow path Ra (between the straight portions 262a, 263a, 26b and the recess 28).

  Therefore, a path without any flow resistance is formed in the first flow path Ra. Accordingly, when the first fluid A having high viscosity and the first fluid A containing solid matter are circulated through the first flow path Ra, the smoothness of the circulation of the first fluid A is ensured. And since the protruding item | line 27 of 2nd surface S2 of heat-transfer plate 2, ... is in the front and back relationship with the recessed item 28 of 1st surface S1, the linear part 270,271 in the protruding item | line 27 on 2nd surface S2. Has the high part 273a and the low part 273b, so that the concave line 28 of the first surface S1 which becomes the back side of the straight portions 270 and 271 (the high part 273a and the low part 273b) of the convex line 27 on the second surface S2. , A deep portion and a shallow portion can be formed. The shallow portion of the recess 28 on the first surface S1 is smaller in the region where the first fluid A enters than the deep portion, and thus the shallow portion of the recess 28 on the first surface S1. , The first fluid A flows in the third direction without stagnation. On the other hand, the first fluid A enters the deep portion of the concave surface 28 of the first surface S1, but the shallow portion is adjacent to the deep portion of the concave surface 28. Therefore, the first fluid A that has entered the deep portion of the recess 28 is drawn into the first fluid A that flows through the shallow portion and flows in the third direction.

  Further, since the straight portions 270, 271 of the ridge 27 on the second surface S2 have the high portion 273a and the low portion 273b, the second portion 270b of the straight portions 270, 271 is second in the second flow path Rb. The fluid B becomes easy to circulate. That is, the interval between the low portion 273b of the straight portions 270, 271 and the counterpart heat transfer plate 2,... Is wider than the interval between the high portion 273a of the straight portions 270, 271 and the counterpart heat transfer plate 2,. Therefore, the flow resistance of the second fluid B is reduced, and the second fluid B is easy to flow.

  As a result, each of the first fluid A in the first flow path Ra and the second fluid B in the second flow path Rb smoothly flows, and as a result, the first fluid A and the second flow flowing in the first flow path Ra. The efficiency of heat exchange with the second fluid B flowing through the path Rb is improved.

  Moreover, in this embodiment, each of the some protruding item | line 27 on the 2nd surface S2 of the heat exchanger plates 2, ... is the linear part 270 of the protruding item | line 27 adjacent in a 3rd direction on both sides of the recessed item | line 29, 271 and the straight portions 270 and 271 thereof are aligned, and the number of the low portions 273b of the straight portions 270 and 271 on the second surface S2 of the heat transfer plates 2. On the other hand, the number of the low portions 273b of the straight portions 270 and 271 of the convex line 27 adjacent on either side in the third direction across the concave line 29 is different. If it does in this way, arrangement | positioning in the 2nd direction of the low part 273b of the protruding item | line 27 (linear part 270,271) adjacent to a 3rd direction on the 2nd surface S2 is the protruding item | line 27 (linear part 270,271). Different for each. Along with this, the shallow portion of the recess 28 on the first surface S1 also differs for each recess 28. Therefore, the first fluid A flowing in the third direction in the first flow path Ra flows so as to follow the shallow portion of the concave stripe 28 of the first surface S1. Therefore, the dispersibility of the first fluid A in the first flow path Ra is increased, and the heat exchange efficiency between the first fluid A and the second fluid B is increased.

  Further, in the present embodiment, the low portions 273b of the straight portions 270, 271 of the ridge 27 on the second surface S2 of the heat transfer plates 2,. It is displaced in the second direction with respect to the low portions 273b of the straight portions 270, 271 of the ridges 27 adjacent in the three directions. If it does in this way, arrangement | positioning in the 2nd direction of the low part 273b of the protruding item | line 27 (linear part 270,271) adjacent to a 3rd direction on the 2nd surface S2 is the protruding item | line 27 (linear part 270,271). Different for each. Along with this, the shallow portion of the recess 28 on the first surface S1 also differs for each recess 28. Therefore, the first fluid A flowing in the third direction in the first flow path Ra flows so as to follow the shallow portion of the concave stripe 28 of the first surface S1. Therefore, the dispersibility of the first fluid A in the first flow path Ra is increased, and the heat exchange efficiency between the first fluid A and the second fluid B is increased.

  In particular, in this embodiment, in the ridge 27 on the second surface S2 of the heat transfer plates 2,..., The width dimension W of the low portion 273b, the high portion 273a, and the low portion in the direction in which the straight portions 270 and 271 extend. Since the ratio (W / d) of the height difference d in the first direction with respect to 273b is 2 or more, the formation range of the low portion 273b of the straight portions 270 and 271 and the depth of the recess 28 in the first surface S1 The formation range of the shallow portion is appropriate, and the flowability of the first fluid A in the first flow path Ra and the flowability of the second fluid B in the second flow path Rb are improved.

  In the present embodiment, each of the plurality of heat transfer plates 2,... Is adjacent to the straight portions 270, 271 of the ridges 27 on the second surface S2 thereof on the other side in the first direction. The second surface S2 in the first direction with respect to the second surface S2 of the adjacent heat transfer plates 2,. The straight portions 262a, 263a, 26b of the ridges 26 (26a, 26b) on the first surface S1 of the heat transfer plates 2,. High portions 260a and 260b that protrude most in the first direction, and low portions 261a and 261b whose protrusion amounts in the first direction are lower than the high portions 260a and 260b, in the direction in which the straight portions 262a, 263a, and 26b extend. High parts 260a, 260b and Department at least one low part 261a, and a 261b.

  Thereby, between the heat-transfer plates 2 ... which form 2nd flow path Rb (between the linear parts 270 and 271 and the concave strip 29) becomes non-contact. Therefore, a path without any flow resistance is formed in the second flow path Rb.

  Thereby, when the second fluid B having a high viscosity and the second fluid B containing solid matter are circulated through the second flow path Rb, the smoothness of the circulation of the second fluid B is ensured. Therefore, even if the first fluid A after heat exchange in the first channel Ra is supplied as the second fluid B to the second channel Rb, the smoothness of the circulation of the second fluid B is ensured.

  And since the protruding item | line 26 (26a, 26b) of 1st surface S1 of the heat-transfer plates 2 ... has the front and back relationship with the recessed item | line 29 of 2nd surface S2, the protruding item | line 26 on the 1st surface S1 ( The straight portions 262a, 263a, 26b in 26a, 26b) have the high portions 260a, 260b and the low portions 261a, 261b, so that the straight portions 262a, 263a, 262 in the ridges 26 (26a, 26b) of the first surface S1. A deep portion and a shallow portion can be formed in the concave line 29 of the second surface S2 which is the back side of 26b (high portions 260a, 260b, low portions 261a, 261b). The shallow portion of the recess 29 on the second surface S2 is smaller in the region where the second fluid B enters than the deep portion, and thus the shallow portion of the recess 29 on the second surface S2. , The second fluid B flows in the third direction without staying. On the other hand, the second fluid B enters the deep portion of the concave surface 29 of the second surface S2, but the shallow portion is adjacent to the deep portion of the concave portion 29. Therefore, the second fluid B that has entered the deep portion of the recess 29 is drawn into the second fluid B that flows through the shallow portion and flows in the third direction.

  Further, since the straight portions 262a, 263a, 26b of the ridges 26 (26a, 26b) on the first surface S1 have the high portions 260a, 260b and the low portions 261a, 261b, the straight portions in the first flow path Ra. The first fluid A can easily flow through the low portions 261a and 261b of 262a, 263a, and 26b. That is, the distance between the low portions 261a, 261b of the straight portions 262a, 263a, 26b and the heat transfer plate 2, ... of the counterpart is such that the high portions 260a, 260b of the straight portions 262a, 263a, 26b and the heat transfer plate 2, of the counterpart .., And the flow resistance of the first fluid A is reduced, and the first fluid A can easily flow.

  As a result, each of the first fluid A in the first channel Ra and the second fluid B in the second channel Rb circulates more smoothly, and as a result, the first fluid A and the second fluid circulated in the first channel Ra. The efficiency of heat exchange with the second fluid B flowing through the flow path Rb is further improved.

  Each of the plurality of ridges 26 (26a, 26b) on the first surface S1 of the heat transfer plates 2,... Is adjacent to the ridges 26 (26a, 26b) in the third direction across the recess 28. The straight portions 262a, 263a, and 26b of the straight line portions 262a, 263a, and 26b are aligned, and the straight portions 262a of the ridges 26 (26a, 26b) on the first surface S1 of the heat transfer plates 2,. The number of low portions 261a and 261b of 263a and 26b is the number of protruding ridges 26 (26a and 26b) that are adjacent on either side in the third direction across the protruding ridges 28 with respect to the protruding ridges 26 (26a and 26b). This is different from the number of low portions 261a, 261b of the straight portions 262a, 263a, 26b. In this way, the arrangement in the second direction of the low portions 261a, 261b of the ridges 26 (26a, 26b) (linear portions 262a, 263a, 26b) adjacent in the third direction on the first surface S1 is convex. It differs for each line 26 (26a, 26b) (straight line portions 262a, 263a, 26b). In connection with this, the shallow part of the concave line 29 of the second surface S2 also differs for each concave line 29. Accordingly, the second fluid B flowing in the third direction in the second flow path Rb flows so as to follow the shallow portion of the concave line 29 of the second surface S2. Therefore, the dispersibility of the second fluid B in the second flow path Rb is increased, and the heat exchange efficiency between the first fluid A and the second fluid B is increased.

  Further, the low portions 261a, 261b of the straight portions 262a, 263a, 26b on the ridges 26 (26a, 26b) on the first surface S1 of the heat transfer plates 2, ... are formed on the ridges 26 (26a, 26b). On the other hand, it is displaced in the second direction with respect to the low portions 261a, 261b of the straight portions 262a, 263a, 26b of the ridges 26 (26a, 26b) adjacent to each other in the third direction across the recess 28. Yes. In this way, the arrangement in the second direction of the low portions 261a, 261b of the ridges 26 (26a, 26b) (linear portions 262a, 263a, 26b) adjacent in the third direction on the first surface S1 is convex. It differs for each line 26 (26a, 26b) (straight line portions 262a, 263a, 26b). In connection with this, the shallow part of the concave line 29 of the second surface S2 also differs for each concave line 29. Accordingly, the second fluid B flowing in the third direction in the second flow path Rb flows so as to follow the shallow portion of the concave line 29 of the second surface S2. Therefore, the dispersibility of the second fluid B in the second flow path Rb is increased, and the heat exchange efficiency between the first fluid A and the second fluid B is increased.

  Further, in the ridges 26 (26a, 26b) on the first surface S1 of the heat transfer plates 2,..., The width dimension W of the low portions 261a, 261b in the extending direction of the straight portions 262a, 263a, 26b and the high portion Since the ratio (W / d) of the height difference d in the first direction between 260a, 260b and the low portions 261a, 261b is 2 or more, the formation range of the low portions 261a, 261b of the straight portions 262a, 263a, 26b, In addition, the formation range of the shallow portion of the recess 28 on the first surface S1 is appropriate, and the flowability of the first fluid A in the first flow path Ra and the flowability of the second fluid B in the second flow path Rb are good. It becomes.

  In addition, this invention is not limited to the said embodiment, Of course, it can add suitably in the range which does not deviate from the summary of this invention.

  In the above embodiment, the first flow path forming gasket 3, the second annular gasket 4, the second flow path forming gasket 5, and the first annular gasket 6 are independent of each other, but are not limited thereto. For example, the first flow path forming gasket 3 and the second annular gasket 4 disposed on the same surface (first surface S1) of the heat transfer plates 2, ... may be integrally formed. Moreover, the 2nd flow path formation gasket 5 and the 1st annular gasket 6 which are arrange | positioned on the same surface (2nd surface S2) of heat-transfer plate 2, ... may be integrally molded.

  In the said embodiment, although straight part 262a, 263a, 26b of the protruding item | line 26 (26a, 26b) of 1st surface S1 contains high part 260a, 260b and low part 261a, 261b, it is not limited to this. For example, when the second fluid B is a non-viscous fluid or a low-viscosity fluid, there is a low possibility that the second fluid B stays in the back of the concave strip 29 on the second surface S2, and thus the convex strip 26 on the first surface S1. The straight portions (262a, 263a, 26b) of (26a, 26b) may be configured only by the high portions 260a, 260b.

  In the above embodiment, the number of the low portions 261a, 261b, 273b of the linear portions 262a, 263a, 26b, 270, 271 adjacent in the third direction is different, but the present invention is not limited to this. For example, the same number may be sufficient as the low part 261a, 261b, 273b of the linear part 262a, 263a, 26b, 270,271 which adjoins in a 3rd direction. In this case, when the fluid (first fluid A, second fluid B) flows in the third direction, the fluid goes around the low portions 261a, 261b, 273b (meanders in the second direction) in the third direction. It is preferable that the low portions 261a, 261b, and 273b of the adjacent straight portions 262a, 263a, 26b, 270, and 271 are arranged to be displaced in the second direction.

  In the above embodiment, the straight portions 262a, 263a, 26b, 270, 271 of the ridges 26, 27 on the first surface S1 and the second surface S2 of the heat transfer plate 2 extend in the second direction, but the present invention is not limited thereto. . For example, the straight portions 262a, 263a, 26b, 270, 271 of the ridges 26, 27 on the first surface S1 and the second surface S2 of the heat transfer plate 2 may extend in a direction including the second direction as a component. That is, the straight portions 262a, 263a, 26b, 270, 271 of the ridges 26, 27 on the first surface S1 and the second surface S2 of the heat transfer plate 2 extend in the synthesis direction of the second direction and the third direction. Also good. In this case, it is preferable that the inclination angle of the straight portions 262a, 263a, 26b, 270, 271 with respect to the horizontal center line CL1 is smaller than the inclination angle of the straight portions 262a, 263a, 270 with respect to the vertical center line CL2.

  In the above embodiment, on the premise that the straight portions 262a, 263a, 26b, 270, 271 adjacent in the third direction are aligned in the third direction, the straight portions 262a, 263a, 26b, 270, adjacent in the third direction, Although the low portions 261a, 261b, and 273b of the 271 are displaced in the second direction, the present invention is not limited to this. For example, the low portions 261a, 261b, 273b of the linear portions 262a, 263a, 26b, 270, 271 adjacent in the third direction are arranged without being displaced in the second direction, and are arranged in alignment in the third direction. Also good. However, in order to make the fluid go around the low portions 261a, 261b, 273b (meander in the second direction) (increase dispersibility), the straight portions 262a, 262a, which are adjacent in the third direction as in the above embodiment. Of course, it is preferable that the low portions 261a, 261b, and 273b of 263a, 26b, 270, and 271 are disposed so as to be displaced in the second direction.

  In the above embodiment, the width dimension W of the low part in the extending direction of the straight portions 262a, 263a, 26b, 270, 271 in the ridges 26, 27 of the first surface S1 and the second surface S2 of the heat transfer plate 2, The ratio (W / d) of the height difference d in the first direction between the high portions 260a, 260b, 273a and the low portions 261a, 261b, 273b is set to 2 or more, but is not limited thereto. For example, in the ridges 26 and 27 on the first surface S1 and the second surface S2 of the heat transfer plate 2, the width W of the low part and the high part 260a in the direction in which the straight portions 262a, 263a, 26b, 270, 271 extend. , 260b, 273a and the height difference d in the first direction between the low portions 261a, 261b, 273b (W / d) may be smaller than 2. However, it is needless to say that it is preferable to perform the same as in the above embodiment in consideration of the flowability of the fluid (first fluid A, second fluid B).

  DESCRIPTION OF SYMBOLS 1 ... Plate type heat exchanger, 2 ... Heat-transfer plate, 3 ... 1st flow path formation gasket (gasket: 1st flow path formation seal line), 4 ... 2nd annular gasket (gasket: seal line), 5 ... 1st Two flow path forming gasket (gasket: second flow path forming seal line), 6 ... first annular gasket (gasket: seal line), 7 ... end plate, 8 ... fastening member, 20 ... first opening, 21 ... 2nd opening, 22 ... 1st flow path formation gasket arrangement part (gasket arrangement part), 23 ... 2nd annular gasket arrangement part (gasket arrangement part), 24 ... Second flow path formation gasket arrangement part (gasket arrangement part) 25 ... 1st annular gasket arrangement | positioning part (gasket arrangement | positioning part), 26 ... Projection, 26a ... 1st long projection (projection), 26b ... Short projection (straight part: projection), 27 ... 2nd long Strips (convex strips), 28, 29 ... concave strips, 30a ... first support portion (support portion), 30b ... second support portion (support portion), 31, ... first straight seal portion (straight seal portion), 32 ... 1st folded seal part (folded seal part), 51 ... 2nd straight seal part (straight seal part), 52 ... 2nd folded seal part (folded seal part), 220 ... 1st straight part (straight part), 221 ... 1st folding part (folding part), 221a ... 1st turn part (turn part), 221b ... 1st connection part (connection part), 240 ... 2nd straight part (straight part), 241 ... 2nd folding part ( 2nd turn part (turn part), 241b ... 2nd connection part (connection part), 242 ... 1st part, 243 ... 2nd part, 243a ... 1st extension part, 243b ... 2nd Extension part, 243c ... connection part, 260a, 26 b ... high part, 261a, 261b ... low part, 262a ... first straight part (straight part), 263a ... second straight part (straight part), 264a, ... connection slope part (slope part), 265a ... end slope part (Inclined part), 267a ... end high part (high part), 267b ... escape part, 268a ... connection high part (high part), 268b ... escape part, 270 ... series straight part (straight part), 271 ... parallel straight line Part (straight line part), 272... Branching part, 272a... Branching inclined part (sloped part), 273a... High part, 273b... Low part, 300a ... first supporting convex part (supporting convex part), 300b. Concave part), 301a ... second support convex part (support convex part), 301b ... second concave part (concave part), 320 ... first turn seal part (turn seal part), 321 ... first connection seal part (connection seal part) 520 ... Second turn seal (turn seal Part), 521 ... second connection seal part (connection seal part), 522 ... first seal part, 523 ... second seal part, 523a ... first extension seal part, 523b ... second extension seal part, 523c ... Linked seal part, A1 ... main heat transfer area, A2 ... end area, A ... first fluid, B ... second fluid, CL1 ... horizontal center line, CL2 ... vertical center line, d ... height difference, d1 ... height difference , D2 ... height difference, Ra ... first flow path, Ra1 ... first inflow path, Ra2 ... first outflow path, Rb ... second flow path, Rb1 ... second inflow path, Rb2 ... second outflow path, S1 ... first Surface, S2 ... second surface, SE ... short side, LE ... long side

Claims (8)

  A plurality of heat transfer plates having a first surface in the first direction and a second surface opposite to the first surface, comprising a plurality of heat transfer plates superimposed in the first direction, Each of the first surfaces is a plurality of ridges and ridges having a length in a second direction orthogonal to the first direction or a direction including the second direction as a component, and is orthogonal to the first direction and the second direction. It has a plurality of ridges and ridges alternately formed in the third direction, and each of the second surfaces of the plurality of heat transfer plates has a ridge and a first that are in a relationship of front and back with the ridges on the first surface. It has a ridge in the relation of the front and back of the surface ridge, and each of the ridge on the first surface and the ridge on the second surface of the heat transfer plate is a second direction or a second direction orthogonal to the first direction. A plurality of linear portions extending in a direction including the component and spaced apart in the second direction or the direction including the second direction in the component, Each includes a plurality of linear portions that are displaced in a direction perpendicular to a direction including the second direction or the second direction with respect to a linear portion adjacent in the second direction or the direction including the second direction as a component. Each of the plurality of heat transfer plates is in a state in which the straight portion of the ridge on the first surface of the plate is aligned with the groove on the first surface of the adjacent heat transfer plate on one side in the first direction. The first surface is opposed to the first surface of the heat transfer plate adjacent on one side in the first direction with a gap in the first direction, and between the heat transfer plate adjacent on one side in the first direction. Forming a first flow path through which the first fluid flows in the third direction, with the second surface of the first fluid facing the second surface and the adjacent heat transfer plate on the other side of the first direction, Forming a second flow path for circulating the second fluid in the third direction between adjacent heat transfer plates on the side, The straight portion of the ridge on the second surface of the heat transfer plate that faces one surface to the other is a high portion that protrudes most in the first direction, and a low portion in which the protruding amount in the first direction is lower than the high portion, A plate heat exchanger comprising: at least one low part aligned with a high part in a direction in which the straight portion extends.   Each of the plurality of ridges on the second surface of the heat transfer plate aligns the straight portions of the ridges adjacent to each other in the third direction across the recesses, and aligns the second straight portion of the heat transfer plate. The number of low portions of the straight portion of the ridge on the surface is different from the number of low portions of the straight portion of the ridge adjacent to either side of the third direction across the concave with respect to the ridge. The plate heat exchanger according to claim 1.   The low part of the straight line portion of the ridge on the second surface of the heat transfer plate is second to the low part of the straight line portion of the ridge that is adjacent to the ridge in the third direction with the concave line interposed therebetween. The plate heat exchanger according to claim 1 or 2, wherein the plate heat exchanger is disposed so as to be displaced in a direction.   In the ridge on the second surface of the heat transfer plate, the ratio (W / d) between the width dimension W of the low part in the extending direction of the straight portion and the height difference d in the first direction between the high part and the low part. The plate heat exchanger according to any one of claims 1 to 3, wherein is 2 or more.   Each of the plurality of heat transfer plates has its own straight line portion on the second surface along the concave surface of the second surface of the heat transfer plate adjacent on the other side in the first direction. The second surface of the heat transfer plate is opposed to the second surface of the heat transfer plate adjacent on the other side of the first direction with a gap in the first direction, and the second surfaces are opposed to each other in the first direction. The straight line portion of the ridge on one surface is the high part that protrudes most in the first direction, and the low part that the protrusion amount in the first direction is lower than the high part, and the high part in the direction in which the straight part extends. The plate type heat exchanger according to any one of claims 1 to 4, further comprising at least one low portion arranged side by side.   Each of the plurality of ridges on the first surface of the heat transfer plate aligns the straight portions of the ridges adjacent to each other in the third direction across the recesses, and aligns the first straight portion of the heat transfer plate. The number of low portions of the straight portion of the ridge on the surface is different from the number of low portions of the straight portion of the ridge adjacent to either side of the third direction across the concave with respect to the ridge. The plate heat exchanger according to claim 5.   The low part of the straight line portion of the ridge on the first surface of the heat transfer plate is second with respect to the low part of the straight line portion of the ridge that is adjacent to the ridge in the third direction across the concave line. The plate heat exchanger according to claim 5 or 6, wherein the plate heat exchanger is disposed so as to be displaced in a direction.   In the ridges on the first surface of the heat transfer plate, the ratio (W / d) between the width dimension W of the low part in the direction in which the linear portion extends and the height difference d in the first direction between the high part and the low part. Is a plate type heat exchanger according to any one of claims 5 to 7.