JP6097696B2 - Plate heat exchanger - Google Patents

Description

Cross-reference of related applications

  This application claims the priority of Japanese Patent Application No. 2011-2333098, and is incorporated into the description of this specification by reference.

  The present invention relates to a plate heat exchanger for exchanging heat between a high-temperature fluid and a low-temperature fluid. Specifically, the present invention provides a low-temperature flow path and a flow path for circulating a high-temperature fluid between the heat transfer plates by laminating a plurality of heat transfer plates and interposing a gasket around the heat transfer plates. The present invention relates to a plate heat exchanger in which flow paths for circulating fluid are alternately formed.

  As shown in FIG. 8, the plate heat exchanger includes a plurality of rectangular heat transfer plates 20 between a rectangular plate-shaped fixed frame 11 in a vertical posture and a rectangular plate-shaped moving frame 12 in a vertical posture. 20, are stacked in a vertical posture, and as shown in FIG. 9, the first flow path 1 and the second flow path 2 are alternately formed between the heat transfer plate 20 and the heat transfer plate 20, The high temperature fluid H and the low temperature fluid C are heat-exchanged by circulating the high temperature fluid H through the first flow path 1 and flowing the low temperature fluid C through the second flow path 2.

  And the passage hole 11a-11d used as the entrance / exit of the fluids H and C is provided in the four corners of the fixed flame | frame 11, and the passage hole is not provided in the movement flame | frame 12. FIG. In addition, dedicated plates (hereinafter referred to as “D plates” and “E plates”) 31 and 32 are superimposed on the fixed frame 11 and the movable frame 12, respectively. Passage holes (not numbered) are provided at the four corners of the D plate 31, and gaskets (hereinafter referred to as “D gaskets”) 140 surrounding the passage holes are interposed between the D plate 31 and the fixed frame 11. It is disguised. The E plate 32 is not provided with a passage hole.

  In addition, the heat transfer plate 20 is provided with passage holes 21 to 24 serving as inlets and outlets of the fluids H and C at the four corners, and a heat transfer portion (not numbered) is provided at the intermediate portion. For example, the upper and lower passage holes 21 and 22 communicate with the heat transfer section, and the upper right and lower passage holes 23 and 24 open to the heat transfer section. Do not do it, or vice versa.

  The gasket 130 is a separate or illustrated flow path forming gasket 131 surrounding the outer peripheral portion (inner side along the outer peripheral edge) of each heat transfer plate 20 and the communication path forming gasket 132 surrounding the passage holes 21 to 24. It is said that it was formed integrally.

  In the plate heat exchanger, the upper and lower communication passage forming gaskets 132, 132 surround the right upper and lower passage holes 23, 24, thereby blocking the left upper and lower passage holes 21, 22 and the first flow path 1. And the first flow path 1 through which the high-temperature fluid H flows is provided by the flow path forming gasket 131 surrounding the left and upper passage holes 21 and 22 and the heat transfer section. Yes.

  In the plate heat exchanger, the upper and lower communication passage forming gaskets 132 and 132 surround the left and upper passage holes 21 and 22, thereby blocking the right and upper passage holes 23 and 24 and the second flow path 2. And the second flow path through which the low-temperature fluid C circulates because the flow path forming gasket 131 surrounds the upper and lower communication path forming gaskets 132 and 132 and the heat transfer section. 2 is provided.

  Accordingly, in FIG. 9, the high temperature fluid H flows downward from the upper left passage hole 21 through the first flow path 1 and is discharged from the lower left passage hole 22, and the low temperature fluid C is discharged from the lower right passage hole 24 to the second. The fluids H and C are heat-exchanged by flowing upward in the flow path 2 and being discharged from the upper right passage hole 23.

  In addition, although not shown in the figure, a plurality of cassette plates in which the outer peripheral portions of the two heat transfer plates are permanently joined by laser welding or brazing are stacked in a vertical posture, and a gasket is interposed on the outer peripheral portion of the cassette plate. Thus, there is a patent on a junction type plate heat exchanger in which a first flow path or a second flow path is formed in a cassette plate, and a second flow path or a first flow path is formed between the cassette plate and the cassette plate. It is described in Document 1 and the like.

  In a plate heat exchanger in which a gasket that integrates a flow path forming gasket and a communication path forming gasket is interposed between heat transfer plates, a flow path is formed at the boundary between the heat transfer section and the passage hole. Patent Document 2 discloses a plate heat exchanger having a double (two) gasket in which a part of a gasket for use and a part of a communication passage forming gasket are arranged in parallel. This plate heat exchanger is characterized in that the double gasket is fixed to the heat transfer plate without using an adhesive, and the other portion of the gasket is bonded to the heat transfer plate using an adhesive.

  The double gasket is interposed between the heat transfer plates that are stacked (alternately), so that there is no double gasket and a flow path that connects the heat transfer portion and the passage hole is formed. Yes. The portion of the heat transfer plate where the double gasket is not interposed is easily deformed by the internal pressure, but the double gasket is not bonded to the heat transfer plate by an adhesive. The pressure resistance is improved.

Japanese Unexamined Patent Publication No. 2005-106412 Japanese Patent Laid-Open No. 9-72686

  However, the conventional plate heat exchanger shown in FIGS. 8 and 9 has the following problems.

  In the plate heat exchanger, the high-temperature fluid H flowing into the first flow path 1 flows through the communication passage 3 formed by the communication passage forming gasket 132 surrounding the passage hole 21 as shown in FIG. Yes. As shown in FIG. 10, the communication path forming gasket 132 forming the communication path 3 through which the high temperature fluid H circulates has an inside (wet contact side) in contact with the high temperature fluid H in a wet heat environment. Therefore, thermal degradation proceeds such as hardening or softening due to long-term use.

In addition, since the main component of the gasket 132 for forming the communication path is a polymer (RH), it reacts with oxygen (O ₂ ) when heated by the high-temperature fluid H to generate an alkyl radical (R ·). To do. Since the outside (non-wetted side) of the flow path forming gasket 131 is in contact with the atmosphere, the alkyl radical (R.) reacts with oxygen to generate peroxy radical (ROO.). This peroxy radical (ROO.) Reacts with the polymer (RH) to generate peroxide (ROOH). This peroxide (ROOH) is unstable and easily decomposes into alkoxy radicals (RO.) And hydroxyl radicals (OH.).

  In short, in the communication path forming gasket 132 forming the communication path 3 through which the high temperature fluid H flows, the liquid contact side is in contact with the high temperature fluid H and the non-liquid contact side is in contact with the atmosphere. For this reason, the main component polymer collapses due to the oxidative degradation reaction, the number of radicals increases, and molecular chain scission and cross-linking reactions proceed. As a result, the inherent elasticity of the rubber is lost, and the structure of the communication path forming gasket 132 is in a compression environment. This is due to insufficient surface pressure due to the progress of compression set and the development of cracks. Break occurs. Due to this breakage, the high temperature fluid H may leak from the communication path 3 into the second flow path and mix with the low temperature fluid C.

  Moreover, the plate type heat exchanger described in Patent Document 2 includes a double gasket inside. However, since the communication path forming gasket 132 forming the communication path 3 through which the high temperature fluid H flows is not doubled, oxidation deterioration may occur and the high temperature fluid H may leak to the outside.

  And when the high temperature fluid H is a dangerous chemical | medical solution, if the high temperature fluid H which leaked from the plate type heat exchanger flows out outside, a secondary disaster may be caused. Replacing gaskets early to prevent secondary disasters will increase running costs. In addition, by covering the entire plate heat exchanger with a highly airtight sheet or by inserting rubber into the gap between the outer peripheral edges of the laminated heat transfer plates, oxidation deterioration is suppressed and high temperature Although a method for preventing the fluid H from flowing out can be considered, such a method has not been adopted because of problems in cost and quality.

  Then, this invention makes it a subject to provide the plate type heat exchanger which prevented the gasket for communication path formation which forms the communication path through which a high temperature fluid distribute | circulates from deteriorating.

Plate heat exchanger according to the present invention, the heat transfer plate having a plurality of passages holes are plurally stacked in a standing state, the flow path forming gasket between the outer periphery of the heat transfer plate adjacent interposed As a result, the first flow path for circulating the high temperature fluid and the second flow path for circulating the low temperature fluid are alternately formed with the heat transfer plate as a boundary, and the communication path forming gasket surrounding the path hole is formed. By being interposed between adjacent heat transfer plates, a communication path for allowing fluid to flow into and out of the first flow path and a communication path for flowing into and out of the second flow path are formed, and the communication path forming gasket is formed. , the are and an outer gasket member surrounding the inner gasket member and the inner gasket member surrounding the passage hole double the heat transfer plate is reversible in the vertical direction, in the heat transfer plate, The inner gasket part And a drain hole for discharging fluid leaking from the communication passage is formed between the inner gasket member and the outer gasket member, and below the communication passage. An air supply hole for supplying an inert gas is formed above and on the upper side of the communication path.

  Here, as one aspect of the plate heat exchanger according to the present invention, the communication path forming gasket may be doubled only between the heat transfer plates forming the communication path through which the high-temperature fluid flows. Good.

Moreover, the plate type heat exchanger according to the present invention, which is different from the above, is formed by stacking a plurality of cassette plates in a standing state in which the outer peripheral portions of two heat transfer plates each having a plurality of passage holes are permanently connected. is the outer peripheral portion flow path forming gasket is interposed between each cassette plate, said by the communication passage forming gasket surrounding the passage holes are interposed between and adjacent Kasettopu rate, cassette plate and the cassette plate The first flow path through which the high-temperature fluid flows or the second flow path through which the low-temperature fluid flows are alternately formed, and the communication path forming gasket includes an inner gasket member surrounding the passage hole and the inner gasket member . It is double and an outer gasket member surrounding, the heat transfer plate is reversible in the vertical direction, in the heat transfer plate, the inner gasket A drainage hole for discharging fluid leaking from the communication path is formed between the material and the outer gasket member and below the communication path, and the inner gasket member and the outer gasket member And an air supply hole for supplying an inert gas is formed above the communication path .

Further, examples of another aspect of a plate type heat exchanger according to the present invention, the communication passage forming gasket of the inner gasket member and the outer gasket member and sealed space surrounded by the heat transfer plates not A configuration filled with an active gas can be employed.

It is a general | schematic disassembled perspective view which shows 1st and 2nd embodiment of the plate-type heat exchanger which concerns on this invention. It is a schematic exploded perspective view which shows the principal part of 1st and 2nd embodiment of the plate-type heat exchanger which concerns on this invention. It is a schematic exploded perspective view which shows the principal part of the modification of 1st and 2nd embodiment of the plate-type heat exchanger which concerns on this invention. It is a perspective view which shows 2nd Embodiment of the plate-type heat exchanger which concerns on this invention. It is a principal part expansion disassembled perspective view which shows 2nd Embodiment of the plate-type heat exchanger which concerns on this invention. FIG. 6 shows a second embodiment of the plate heat exchanger according to the present invention, and is an enlarged cross-sectional view of an essential part taken along line VV in FIG. 5. It is a principal part expanded sectional view which shows 3rd Embodiment of the plate-type heat exchanger which concerns on this invention. It is a schematic perspective view which shows the conventional plate type heat exchanger. It is a general | schematic disassembled perspective view which shows the conventional plate type heat exchanger. It is a principal part expanded sectional view which shows the principal part of the conventional plate type heat exchanger.

  A first embodiment of a plate heat exchanger according to the present invention will be described with reference to FIGS. 1 to 3. However, the same parts as in the prior art will be described with the same reference numerals. In the following description, descriptions such as up, down, left, and right are examples of each embodiment, and it is needless to say that actual positions may be different.

  As shown in FIGS. 1 to 3, the plate heat exchanger according to the first embodiment includes a first flow path 1 and a second flow path between a heat transfer plate 20 and a heat transfer plate 20 as in the prior art. 2, the high-temperature fluid H is circulated through the first flow path 1, and the low-temperature fluid C is circulated through the second flow path 2. The first flow path 1 and the second flow path 2 are provided by a gasket 30 interposed between the heat transfer plate 20 and the heat transfer plate 20.

  In the gasket 30, a flow path forming gasket 31 surrounding the outer periphery of the heat transfer plate 20 and a communication path forming gasket 32 surrounding the periphery of the passage holes 21 to 24 are integrated (shown in FIGS. 1 and 2). Or it forms so that it may become another body (shown in FIG. 3). In the gasket 30 in which the flow path forming gasket 31 and the communication path forming gasket 32 are integrally formed, as shown in FIG. 2, the boundary portion between the heat transfer portion and the passage holes 21 to 24 is shared.

  In the plate heat exchanger according to the first embodiment, as shown in FIG. 2, a communication path forming gasket (hereinafter referred to as “double line gasket”) 32 provided with a communication path 3 through which the high-temperature fluid H flows. Is a double of the inner gasket member 32a and the outer gasket member 32b. Accordingly, double grooves are formed in the heat transfer plate 20 corresponding to the inner gasket member 32a and the outer gasket member 32b of the double line gasket 32.

  The inner gasket member 32 a is formed in an annular shape so as to surround the passage holes 21 and 22. The outer gasket member 32 b is formed in a deformed trapezoidal shape, and a boundary portion with the second flow path 2 is shared with the flow path forming gasket 31.

  Further, as shown in FIG. 3, the double line gasket 32 in which the flow path forming gasket 31 and the communication path forming gasket 32 are formed separately from each other includes an annular inner gasket member 32a surrounding the passage holes 21 and 22, respectively. The annular outer gasket member 32b surrounding the inner gasket member 32a is concentrically arranged in parallel. Therefore, the outer gasket member 32 b does not have a portion shared with the flow path forming gasket 31.

  The double line gasket 32 surrounds the upper and lower passage holes 21, 22, thereby providing the communication passage 3 through which the high-temperature fluid H flows. In addition, the communication passage 3 through which the low-temperature fluid C flows is formed in the upper and lower passage holes 23, 24 by the communication passage forming gasket 132 of a general gasket (hereinafter referred to as “single line gasket”) 130 used conventionally. However, the double line gasket 32 may be provided by surrounding the upper and lower passage holes 23, 24.

  Then, the communication path forming gasket 132 of the single line gasket 130 blocks the right and left upper and lower passage holes 23 and 24, and the flow path forming gasket 131 surrounds the left and upper left and right passage holes 21 and 22 and the heat transfer section. By being interposed between the two heat transfer plates 20, 20, the first flow path 1 through which the high-temperature fluid H flows is provided.

  Although not shown, the flow path forming gasket 131 provided with the first flow path 1 may also be configured such that the inner gasket member and the outer gasket member are doubled in parallel. By doing so, the gasket provided with the first flow path 1 can be prevented from being oxidized and deteriorated. Furthermore, the flow path forming gasket 131 provided with the second flow path 2 may also be configured such that the inner gasket member and the outer gasket member are doubled in parallel. By doing so, the first flow path 1 and the second flow path 2 can be assembled without being distinguished.

  And the gasket 30 and the single line gasket 130 are alternately interposed between the adjacent heat transfer plates 20 and 20, whereby the high temperature fluid H flows through the first flow path 1 from the passage hole 21 on the left side. The low temperature fluid C is discharged from the lower left passage hole 22, while the low temperature fluid C flows through the second flow path 2 from the lower right passage hole 24 and is discharged from the upper right passage hole 23. Heat is exchanged between H and the low-temperature fluid C.

  At this time, the high temperature fluid H flows into the first flow path 1 by flowing through the communication path 3 on the left side. The high-temperature fluid H in the communication path 3 touches the inner gasket member 32a of the double line gasket 32. However, since the periphery of the inner gasket member 32a is surrounded by the outer gasket member 32b, the high-temperature fluid H does not touch the atmosphere. The oxidation degradation reaction is difficult.

  Note that the high temperature fluid H flowing through the lower left communication passage 3 is heat-exchanged with the low temperature fluid C and is cooled, so the gasket 32 forming the lower left flow passage 3 is not double but single. It may be. Even if the communication passage 3 for communicating the upper and lower passage holes 23, 24 is provided by the communication passage forming gasket 132 of the single line gasket 130, the low temperature fluid C flows in the communication passage 3, The communication path forming gasket 132 does not become so hot that it is oxidized and deteriorated.

  Therefore, in the plate heat exchanger, the double line gasket 32 does not crack and the high temperature fluid H does not leak from the communication path 3.

  Next, a second embodiment of the plate heat exchanger according to the present invention will be described with reference to FIGS. In the second embodiment, a portion of the heat transfer plate 20 sandwiched between the inner gasket member 32a and the outer gasket member 32b of the double line gasket 32 is provided with both or both of the drainage holes 25 and the air supply holes 26. It is characterized by that.

  In order to discharge the high temperature fluid H leaked from the inner gasket member 32a of the double line gasket 32, the drainage hole 25 is provided with an annular gasket 33 between the heat transfer plates 20 and 20 provided with the first flow path 1. Thus, the drainage hole 25 is made continuous by the gasket 33.

  Then, as shown in FIG. 4, the nozzle 13 continuing to the drainage hole 25 is attached to the fixed frame 11, and when the high temperature fluid H leaks from the nozzle 13 as shown in FIG. 6, the inner gasket member It can be detected that 32a is leaking due to cracks or the like.

  5 and 6 are double D gaskets in which the double line gasket 32 shown in FIG. 2 is interposed between the heat transfer plates 20 and between the fixed frame 11 and the D plate 20d. Although the state where 41 and 42 enclose the communication hole 21 is also shown, the plate type heat exchanger of the second embodiment can be implemented even with the double line gasket 32 shown in FIG.

  In any case, the air supply holes 26 are formed so that the inner gasket member 32a is more resistant to oxidative degradation. That is, an inert gas such as nitrogen is supplied from the air supply hole 26 into a sealed space surrounded by the inner gasket member 32a and the outer gasket member 32b of the double line gasket 32 and the two heat transfer plates 20, and the inner gasket member. Prevent 32a from contacting oxygen at all.

  And since this 1st flow path 1 is adjacent to this sealed space via the heat-transfer plate 20, between the heat-transfer plates 20 and 20 which have provided the 1st flow path 1, it continues with the air supply hole 26. FIG. By interposing the annular gasket 33, the inert gas is supplied into the sealed space from the nozzle 14 that is connected to the gasket 33 and attached to the frame 11. As shown in FIG. 4, a nozzle 14 for supplying this inert gas is attached to the fixed frame 11.

  The drainage hole 25 and the air supply hole 26 may be provided only in the upper left communication passage 3 through which the high temperature fluid H flows at a high temperature, but the double lower side in which the lower left communication passage 3 through which the cooled high temperature fluid H flows is provided. By providing the drain gasket 25 and the air supply hole 26 in the line gasket 32, it can be assembled upside down. Accordingly, in this case, when the liquid discharge hole 25 and the air supply hole 26 are turned upside down, the liquid discharge hole 25 becomes the air supply hole 26 and the air supply hole 26 becomes the liquid discharge hole 25.

  Next, a third embodiment of the plate heat exchanger according to the present invention will be described with reference to FIG. The third embodiment is characterized in that a double line gasket 32 is interposed between a cassette plate 200 and a plurality of cassette plates 200 stacked in a vertical posture.

  The cassette plate 200 is obtained by permanently connecting the outer peripheral portions of the two heat transfer plates 20 and 20 by laser welding or brazing (indicated by black circles in FIG. 7). A second flow path 2 through which the flow path 1 or the low temperature fluid C flows is provided.

  A plurality of cassette plates 200 are stacked, and a second flow path 2 for flowing the low-temperature fluid C or a first flow path 1 for flowing the high-temperature fluid H is provided between the cassette plates 200. A gasket 30 is interposed on the outer peripheral portion of the stacked cassette plate 200 and cassette plate 200.

  The gasket 30 is a combination of a flow path forming gasket (not shown) interposed in the outer peripheral portion of the cassette plate 200 that is permanently connected and a double line gasket 32 provided with the communication path 3. In the double line gasket 32, an annular inner gasket member 32a surrounding the passage holes 21 and 22 and an outer gasket member 32b surrounding the inner gasket member 32a are concentrically arranged in parallel. The outer gasket member 31b is interposed inside the permanent connection as shown in the figure.

  Alternatively, although not shown, the outer gasket member 32b is interposed between the permanently connected portions 201, and the inner gasket member 31a is interposed between the permanently connected inner sides (lines interposed in the outer gasket member 31b in FIG. 7). Be dressed.

  Since the high temperature fluid H is circulated in the first flow path 1 in the cassette plate 200, the high temperature fluid H is also circulated in the communication path 3. The communication passage 3 is formed by a double line gasket 32 surrounding the passage holes 21 and 22. The inner gasket member 32a of the double line gasket 32 is in contact with the high-temperature fluid H, but the reaction with oxygen in the atmosphere is suppressed and oxidative degradation is suppressed.

  Therefore, the plate type heat exchanger in which the cassette plate 200 is assembled also prevents the double line gasket 32 from cracking or settling due to aging, and the high temperature fluid H does not leak early. In this plate type heat exchanger, even if the low temperature fluid C is circulated in the cassette plate 200 and the high temperature fluid H is circulated between the cassette plate 200 and the cassette plate 200, the high temperature fluid H does not leak. can do.

  As described above, in the plate heat exchanger according to the present embodiment, a plurality of heat transfer plates 20 in which a plurality of passage holes 21, 22, 23, and 24 are formed are stacked, and between the outer peripheral portions of the adjacent heat transfer plates 20. By interposing the gasket 31 for channel formation, the first channel 1 for circulating the high-temperature fluid H and the second fluid 2 for circulating the low-temperature fluid C are alternately formed with the heat transfer plate 20 as a boundary. The communication passage forming gaskets 32 and 32 surrounding the passage holes 21, 22, 23 and 24 are interposed between the adjacent heat transfer plates 20, thereby allowing the fluids H and C to flow through the first flow path 1. The communication path 3 that flows into and out of the second flow path 2 and the communication path 3 that flows into and out of the second flow path 2 are formed, and the communication path forming gasket 32 is an inner gasket member 32a that surrounds the passage holes 21, 22, 23, and 24. And an outer gasket surrounding the inner gasket 32a. They are double and a socket member 32b. For this reason, the communication passage forming gasket 32 is formed by double the inner gasket member 32a and the outer gasket member 32b so as to surround the passage holes 21, 22, 23, 24, thereby forming the communication passage 3. Although the reaction with the oxygen in the atmosphere is suppressed while touching the high temperature fluid H, the molecular chain scission and crosslinking reaction due to the oxidative degradation reaction do not proceed in the inner gasket member 32a that maintains the seal, and the compression set progresses. It is possible to prevent cracking and to prevent the high temperature fluid H flowing through the communication path 3 formed by the communication path forming gasket 32 from leaking.

  Further, according to the plate heat exchanger according to the present embodiment, the communication path forming gasket 32 is doubly arranged in parallel only between the heat transfer plates 20 forming the communication path 3 through which the high-temperature fluid H flows. ing. Accordingly, in view of the fact that the gasket deterioration for the communication passage forming gasket 32 that forms the communication passage 3 through which the high-temperature fluid H circulates easily proceeds due to the oxidation deterioration reaction, only the gasket 32 for communication passage formation is doubled. The communication path forming gasket 32 that forms a flow path through which the fluid C flows is made a single layer.

  In addition, the plate heat exchanger according to the present embodiment includes a plurality of cassette plates 200 in which the outer peripheral portions of the two heat transfer plates 20, 20 having a plurality of passage holes 21, 22, 23, 24 are permanently connected. The flow path forming gaskets 31 are interposed between the outer peripheral portions of the adjacent cassette plates 200 and 200 which are stacked, and the communication path forming gaskets 32 surrounding the passage holes 21, 22, 23 and 24 are adjacent to each other. By interposing between the heat transfer plates 200, the first flow path 1 for circulating the high-temperature fluid H or the second flow path 2 for circulating the low-temperature fluid C alternately in the cassette plate 200 and between the cassette plates 200. The communication path forming gasket 32 is formed with an inner gasket member 32a surrounding the passage hole and an outer gasket member 32b surrounding the inner gasket 32a. I have been in. For this reason, the communication path forming gasket 32 interposed between the cassette plate 200 and the cassette plate 200 is doubled by the inner gasket member 32a and the outer gasket member 32b. In the case where the first flow path 1 through which H flows is provided, the communication path forming gasket 32 is less likely to undergo oxidative deterioration reaction, suppresses the progress of gasket deterioration, and prevents the high temperature fluid H from leaking from the communication path 3. Can do.

  Further, according to the plate heat exchanger according to the present embodiment, the drainage holes 25 are formed in the heat transfer plate 20 between the inner gasket member 32a and the outer gasket member 32b of the communication path forming gasket 32. Has been. Therefore, the drainage holes 25 are formed in the heat transfer plate 20 between the inner gasket member 32a and the outer gasket member 32b, so that the inner gasket is removed from the inner gasket member 32a due to the settling due to thermal deterioration and aging deterioration. The leaked high temperature fluid H can be discharged from the drain hole 25 in the outer gasket member 32b.

  Further, according to the plate heat exchanger according to the present embodiment, the air supply holes 26 are formed in the heat transfer plate 20 between the inner gasket member 32a and the outer gasket member 32b between the communication path forming gaskets 32. The sealed space surrounded by the inner and outer gasket members and the heat transfer plate 20 is filled with an inert gas. Thereby, the inert gas is filled in the sealed space surrounded by the inner gasket member 32a, the outer gasket member 32b, and the heat transfer plate 20, thereby eliminating the air present in the sealed space. The oxidation deterioration reaction of the inner gasket member 32a can be suppressed as much as possible.

  The present invention can be variously modified without being limited to the first to third embodiments. For example, the plate type heat exchanger for stacking the cassette plates 200 described in the third embodiment also includes the exhaust holes and the air supply holes 26 described in the second embodiment, and in the first embodiment. As described, the communication path forming gasket 32 may be doubled only on the upstream side of the first flow path 1. Further, the nozzle 13 continuing to the drainage hole 25 and the nozzle 14 continuing to the air supply hole 26 may be provided in the moving frame 12 instead of the fixed frame 11.

DESCRIPTION OF SYMBOLS 1 ......... First flow path 2 ......... Second flow path 3 ......... Communication passage 20 ... Heat transfer plates 21, 22, 23, 24 ... Passage hole 25 ... Drainage hole 26 ... Air supply hole 30 …… Gasket 31 …… Flow path forming gasket 32 …… Communication path forming gasket (double line gasket)
32a ... Inner gasket member 32b ... Outer gasket member 200 ... Cassette plate C ......... Low temperature fluid H ......... High temperature fluid

Claims (4)

A plurality of heat transfer plates in which a plurality of passage holes are formed are stacked in a standing state ,
A flow path forming gasket is interposed between the outer peripheral portions of the adjacent heat transfer plates, whereby a first flow path for circulating a high temperature fluid with the heat transfer plate as a boundary, and a second flow for circulating a low temperature fluid Roads are formed alternately,
A communication passage for allowing fluid to flow into and out of the first flow path and a communication path for flowing into and out of the second flow path by interposing between the adjacent heat transfer plates with a communication path forming gasket surrounding the passage hole. And formed,
The communication passage forming gaskets, and an outer gasket member surrounding the inner gasket member and the inner gasket member surrounding said passage hole being doubly
The heat transfer plate can be turned upside down,
In the heat transfer plate, a drainage hole is formed between the inner gasket member and the outer gasket member and on the lower side of the communication path for discharging fluid leaked from the communication path. A plate heat exchanger in which an air supply hole for supplying an inert gas is formed between the inner gasket member and the outer gasket member and above the communication path .   2. The plate heat exchanger according to claim 1, wherein the communication path forming gasket is doubly arranged in parallel only between heat transfer plates forming a communication path through which the high-temperature fluid flows. Cassette plate the outer peripheral portion is permanently connected to the two heat transfer plates forming a plurality of the passage holes are plurally stacked in a standing state,
A gasket for forming a flow path is interposed between the outer peripheral portions of the adjacent cassette plates,
By interposing between the adjacent cassette plates gasket for forming the communication passage surrounding the passage hole,
The first flow path for circulating the high temperature fluid or the second flow path for flowing the low temperature fluid are alternately formed in the cassette plate and between the cassette plates,
The communication passage forming gaskets, and an outer gasket member surrounding the inner gasket member and the inner gasket member surrounding said passage hole being doubly
The heat transfer plate can be turned upside down,
In the heat transfer plate, a drainage hole is formed between the inner gasket member and the outer gasket member and on the lower side of the communication path for discharging fluid leaked from the communication path. A plate heat exchanger in which an air supply hole for supplying an inert gas is formed between the inner gasket member and the outer gasket member and above the communication path . Said to the inner gasket member outer gasket member and the heat transfer plate and an inert gas in a closed space surrounded by the claims 1 and is filled any one of 3 before Killen passage forming gaskets The plate heat exchanger as described.

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