JP5574737B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that is suitably used for an evaporator of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  In this specification and claims, the top and bottom of FIGS.

  For example, as an evaporator that satisfies the demands for high performance and small size and light weight, the present applicant has previously set a length direction between a pair of header tanks arranged at intervals in the vertical direction and the header tanks. A plurality of flat heat exchange pipes that are oriented in the vertical direction and spaced apart in the length direction of the header tank, the upper first header tank comprising a refrigerant inlet header section, and a refrigerant inlet header section And a refrigerant outlet header part integrated with the refrigerant inlet header part, and a first intermediate header part provided so that the lower second header tank faces the refrigerant inlet header part And a second intermediate header portion provided on the windward side of the first intermediate header portion so as to face the refrigerant outlet header portion and integrated with the first intermediate header portion, and each header portion of both header tanks In between, a heat exchange tube group consisting of a plurality of heat exchange tubes arranged at intervals in the length direction of both header tanks is provided, and each of the heat exchange tubes of each heat exchange tube group is provided. Both upper and lower end portions are connected to each header portion of the first header tank and each header portion of the second header tank, a refrigerant inlet is provided at one end portion of the refrigerant inlet header portion, and the other end is closed, and a refrigerant outlet header portion A refrigerant outlet is provided at the same end as the refrigerant inlet and the other end is closed. The refrigerant inlet header is partitioned into first and second spaces arranged vertically by a partition, and the refrigerant inlet is the first. While communicating with the space, the heat exchange pipe faces the second space, and a communication port is formed in the closed end portion of the refrigerant inlet header portion in the partition portion to allow the first space and the second space to pass through. further A plurality of refrigerant passage holes are formed in the cut portion at intervals in the length direction of the refrigerant inlet header portion, and the refrigerant flowing into the refrigerant inlet header portion from the refrigerant inlet passes through the communication port and the refrigerant passage hole in the first space. Proposed an evaporator adapted to flow into the heat exchange pipe after entering the second space (see Patent Document 1).

  However, as a result of various studies by the present inventors, it has been found that the following problems occur in the evaporator described in Patent Document 1.

  That is, in the evaporator described in Patent Document 1, the refrigerant that has entered the second space from the first space through the refrigerant passage hole can easily flow into the heat exchange pipe near the refrigerant passage hole, and from the refrigerant passage hole. It becomes difficult to flow into the remote heat exchange pipe, and as a result, the distribution of the refrigerant to the total heat exchange pipe connected to the refrigerant inlet header is non-uniform. Therefore, the discharge temperature that is the temperature of the air that has passed through the evaporator becomes non-uniform at the end on the side where the communication port is formed, and the uniformity of the discharge temperature for the entire width of the evaporator may be insufficient. I found.

JP 2008-298319 A

  An object of the present invention is to provide a heat exchanger that can solve the above-described problems and can achieve a more uniform discharge temperature when used as an evaporator.

  In order to achieve the above object, the present invention comprises the following aspects.

1) A refrigerant inlet header portion having a longitudinal direction and a direction perpendicular to the ventilation direction and perpendicular to the ventilation direction, and having a refrigerant inlet, and a length direction of the refrigerant inlet header portion with the longitudinal direction directed in the vertical direction And a plurality of heat exchange pipes connected to the refrigerant inlet header portion, and the refrigerant inlet header portion is partitioned into first and second spaces arranged vertically by a partitioning portion. The refrigerant inlet communicates with the first space, and the heat exchange pipe faces the second space. The refrigerant passes from the first space to the second space through the communication portion provided in the partition. In the heat exchanger in which a plurality of the communication parts are provided at intervals in the length direction of the refrigerant inlet header part ,
The communication portion includes a slit formed in the partition portion with the length direction directed in the length direction of the refrigerant inlet header portion, and each communication portion has a first space while flowing the refrigerant in the width direction of the refrigerant inlet header portion. from being adapted to flow into the second space,
A pair of two linear cut portions formed on the partition portion in the length direction of the refrigerant inlet header portion and spaced in the ventilation direction is spaced in the length direction of the refrigerant inlet header portion. A plurality of slits having a length direction in the length direction of the refrigerant inlet header portion are formed by deforming the portion between each pair of linear cut portions in the partition portion upward. A plurality of heat exchangers formed on the side portion at intervals in the length direction of the refrigerant inlet header.

2) The refrigerant inlet header is disposed between the first member to which the heat exchange pipe is connected, the second member that covers the upper side of the first member, and the first member and the second member. The heat exchanger according to 1), further comprising a third member brazed to the two members and having a partition portion that divides the refrigerant inlet header portion into first and second spaces.

3) On the windward side of the refrigerant inlet header portion, a refrigerant outlet header portion whose length direction is directed in the vertical direction and in a direction perpendicular to the ventilation direction is integrally provided, and the length direction is arranged in the vertical direction on the refrigerant outlet header portion. And a plurality of heat exchange tubes arranged at intervals in the length direction of the refrigerant outlet header portion are connected, a refrigerant outlet is provided at one end portion of the refrigerant outlet header portion, and the other end portion is closed. The refrigerant outlet header is partitioned into first and second spaces that are lined up and down by the partition, and a refrigerant passage hole is formed through the first and second spaces, and the refrigerant outlet is in the first space. As well as a heat exchange tube facing the second space,
The refrigerant inlet header portion and the refrigerant outlet header portion are provided in one header tank, and the header tank includes a first member to which the heat exchange pipe is connected, a second member that covers the upper side of the first member, A third member disposed between the first member and the second member and brazed to the first and second members; an end member brazed to both ends of the first member, the second member and the third member; The first and second members are provided with header forming portions that form the refrigerant inlet header portion and the refrigerant outlet header portion, respectively, and the third member has the first and second portions inside the refrigerant inlet header portion and the refrigerant outlet header portion, respectively. The two partition portions partitioned into the second space are provided, the refrigerant inlet and the refrigerant outlet are formed in one of the end members, and the communication portion is formed in the partition portion of the refrigerant inlet header portion in the third member 1) Also 2) A heat exchanger according.

According to the heat exchangers of 1) to 3) above, the communication portion provided in the partition that partitions the refrigerant inlet header portion into the first space and the second space is spaced in the length direction of the refrigerant inlet header portion. Since each of the communication portions is configured to flow the refrigerant from the first space to the second space while flowing in the width direction of the refrigerant inlet header portion, the communication portions are arranged at positions away from the communication portion. The refrigerant easily flows into a certain heat exchange pipe, and the distribution of the refrigerant to all the heat exchange pipes connected to the refrigerant inlet header is made uniform. Therefore, the air discharge temperature, which is the temperature of the air that has passed through the evaporator to which the heat exchangers 1) to 8) described above are applied, is made uniform at the end opposite to the refrigerant inlet, and the air discharge temperature is further made uniform. It becomes possible to plan.

According to the heat exchanger of 1) above, in the refrigerant inlet header portion, the refrigerant that has flowed from the first space into the second space through the communication portion easily flows into each heat exchange pipe, and the refrigerant inlet header portion The distribution of the refrigerant to the connected total heat exchange pipe is made more uniform.

Above 1) by the heat exchanger lever of the refrigerant entering from the first space into the second space through the slit, heat exchange while flowing so as to spread in the longitudinal direction of the inlet header after bumped each other since flow into the tube, the refrigerant becomes tends to flow to the heat exchange tubes located away from the communicating portion, the distribution of the refrigerant to all the heat exchange tubes connected to the inlet header is more uniform.

According to the heat exchanger of 3) above, the refrigerant inlet header portion and the refrigerant outlet header portion can be manufactured relatively easily.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. It is the vertical sectional view which abbreviate | omitted one part seen from the back of the evaporator of FIG. It is the AA line expanded sectional view of Drawing 2 which omitted some. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a disassembled perspective view of the 1st header tank of the evaporator of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is a disassembled perspective view of the 2nd header tank of the evaporator of FIG. It is CC sectional view taken on the line of FIG. It is a figure equivalent to a part of Drawing 3 showing the 1st modification of a communicating part. It is a figure equivalent to a part of Drawing 3 showing the 2nd modification of a communicating part.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner.

  In the following description, the downstream side (the direction indicated by the arrow X in FIGS. 1, 3, 4, and 8 to 10) of the air flowing through the ventilation gap between adjacent heat exchange tubes is forward and opposite to this. The side is referred to as the rear, and the left and right in FIG.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  In addition, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 shows the overall configuration of the evaporator, and FIGS. 2 to 8 show the configuration of the main part of the evaporator.

  1 to 4 and 8, the evaporator (1) includes an aluminum first header tank (2) and an aluminum second header tank (3) which are arranged in the vertical direction and extend in the horizontal direction. And a heat exchange core portion (4) provided between the header tanks (2) and (3).

  The first header tank (2) is located on the front side (downstream side in the ventilation direction) and extends in the left-right direction (vertical direction and direction perpendicular to the ventilation direction) and the rear side (ventilation direction). A refrigerant outlet header portion (6) located on the upstream side and extending in the left-right direction, and a connecting portion (7) for connecting and integrating the header portions (5) and (6) to each other are provided. The refrigerant inlet header part (5) of the first header tank (2) has a refrigerant inlet (8) at the right end and is closed at the left end. Similarly, the refrigerant outlet header part (6) is at the refrigerant outlet (9) at the right end. And the left end is closed, and an aluminum refrigerant inlet pipe (11) is connected to the refrigerant inlet header (5) of the first header tank (2) so as to communicate with the refrigerant inlet (8). An aluminum refrigerant outlet pipe (12) is connected to the outlet header (6) so as to communicate with the refrigerant outlet (9). The second header tank (3) includes a first intermediate header portion (13) located on the front side and extending in the left-right direction; a second intermediate header portion (14) located on the rear side and extending in the left-right direction; A connecting portion (15) for connecting and integrating the portions (13) and (14) to each other;

  The heat exchange core section (4) is composed of a plurality of heat exchange pipe groups (17) composed of a plurality of heat exchange pipes (16) arranged in parallel at intervals in the left-right direction. Are arranged in two rows, the ventilation gap between adjacent heat exchange tubes (16) of each heat exchange tube group (17), and the heat exchange tubes (16) at the left and right ends of each heat exchange tube group (17). Corrugated fins (18) are arranged on the outside and brazed to the heat exchange pipe (16), and aluminum side plates (19) are arranged on the outer sides of the corrugated fins (18) on both the left and right ends, respectively. It is configured by brazing to 18). The upper and lower ends of the heat exchange pipe (16) of the front heat exchange pipe group (17) are connected to the refrigerant inlet header part (5) and the first intermediate header part (13), and the rear heat exchange pipe group (17). The upper and lower ends of the heat exchange pipe (16) are connected to the refrigerant outlet header (6) and the second intermediate header (14).

  The heat exchange pipe (16) is made of a bare material formed of an aluminum extruded profile, and has a flat shape having a plurality of refrigerant passages arranged in the width direction and arranged in the width direction in the front-rear direction. The corrugated fin (18) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and is composed of a wave-like portion, a wave-bottom portion, and a horizontal connecting portion that connects the wave-top portion and the wave-bottom portion, A plurality of louvers are formed in the connecting portion side by side in the front-rear direction. The corrugated fin (18) is shared by the front and rear heat exchange tubes (16) constituting the front and rear heat exchange tube group (17), and the width in the front and rear direction is the same as that of the front edge of the front heat exchange tube (16). The distance from the rear edge of the rear heat exchange pipe (16) is substantially equal. The wave crest and wave bottom of the corrugated fin (18) are brazed to the front and rear heat exchange tubes (16). The front edge of the corrugated fin (18) protrudes slightly forward from the front edge of the front heat exchange pipe (16). In addition, instead of one corrugated fin (18) being shared by both the front and rear heat exchange tube groups (17), each corrugated fin is disposed between adjacent heat exchange tubes (16) of both heat exchange tube groups (17). May be arranged.

  The first header tank (2) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plate-shaped first member (21) to which all heat exchange tubes (4) are connected. A second member (22) formed by pressing an aluminum brazing sheet having a brazing material layer on both sides and covering the upper side of the first member (21); and an aluminum brazing sheet having a brazing material layer on both sides Alternatively, a third member formed by pressing aluminum bare material and disposed between the first member (21) and the second member (22) and brazed to both members (21) (22). (23) and a brazing material formed on the both sides of the first member (21), the second member (22) and the third member (23) by pressing an aluminum brazing sheet having a brazing material layer on both sides. Attached aluminum Long aluminum in the front-rear direction brazed to straddle the refrigerant inlet header (5) and the refrigerant outlet header (6) on the outer surfaces of the left and right end members (24) (25) and the right end member (25) The refrigerant inlet pipe (11) and the refrigerant outlet pipe (12) are connected to the joint plate (26). The joint plate (26) is formed by pressing a bare aluminum material.

  As shown in FIGS. 2 to 6, the first member (21) includes a front and rear header forming portion (27) that bulges downward and forms lower portions of the refrigerant inlet header portion (5) and the refrigerant outlet header portion (6). ) (28) and a connecting wall (29) for connecting the front and rear header forming portions (27) and (28) together and forming the lower portion of the connecting portion (7). A plurality of pipe insertion holes (31) that are long in the front-rear direction are arranged in both header forming portions (27), (28) of the first member (21) at intervals in the left-right direction and at the same position in the left-right direction. Is formed. The upper end portion of the heat exchange pipe (16) is inserted into the pipe insertion hole (31) and brazed to the first member (21) using the brazing material layer of the first member (21).

  The second member (22) includes upper and lower front and rear header forming portions (32) and (33) forming upper portions of the refrigerant inlet header portion (5) and the refrigerant outlet header portion (6), and front and rear header formation. The parts (32) and (33) are integrally connected to each other and are formed with a connecting wall (34) that forms the upper part of the connecting part (7).

  The third member (23) includes a plate-shaped front partition (37) that divides the refrigerant inlet header (5) into a first space (35) and a second space (36) arranged vertically. A plate-like rear partition (41) that partitions the refrigerant outlet header (6) into a first space (38) and a second space (39) arranged vertically, and both partitions (37) ( 41) and a connecting wall (42) that forms an intermediate portion in the vertical direction of the connecting portion (7). The refrigerant inlet (8) of the refrigerant inlet header (5) communicates with the first space (35), and the heat exchange pipe (16) of the front heat exchange pipe group (17) faces the second space (36). The refrigerant flows into the first space (35) through the refrigerant inlet (8), and the refrigerant flows from the second space (36) into the heat exchange pipe (16). The refrigerant outlet (9) of the refrigerant outlet header (6) communicates with the first space (38), and the heat exchange pipe (16) of the rear heat exchange pipe group (17) faces the second space (39). The refrigerant flows out from the first space (38) through the refrigerant outlet (9), and the refrigerant flows from the heat exchange pipe (16) into the second space (39).

  The front part (leeward part) and the rear part (leeward part) of the front partitioning part (37) of the third member (23) are respectively lengthwise in the left-right direction (the length of the refrigerant inlet header part (2)). A plurality of slits (43) (communication portion) that are formed in the direction of the vertical direction and through the first space (35) and the second space (36) of the refrigerant inlet header (5). Has been. The slit (43) extends from the front partition (37) in the left-right direction, and a pair of two linear cutting portions (44) formed at intervals in the front-rear direction (ventilation direction) A plurality of lines are formed at intervals, and a portion between each pair of linear cut portions (44) in the front partition (37) is deformed downward. The downward deformation portion is indicated by (45). The front slit (43) opens to the leeward side below the lower surface of the front partition (37), and the rear slit (43) winds down from the lower surface of the front partition (37). Open to the upper side.

  In addition, the front partition portion (37) is provided on the portion between the adjacent deformed portions (45) in the front partition portion (37) of the third member (23) and on the right side of the deformed portion (45) at the right end portion. By deforming, a bulging portion (46) that is rectangular in the front-rear direction and bulges downward is formed. The deformation portion (45) and the bulging portion (46) are formed between the heat exchange tubes (16) adjacent in the left-right direction.

  The rear partitioning portion (41) of the third member (23) has a plurality of bulging portions (which are long in the front-rear direction and bulge downward) by deforming the rear partitioning portion (41). 47) are formed at intervals in the left-right direction. The bulging portion (47) is formed between the heat exchange tubes (16) adjacent in the left-right direction. In the rear part of the rear partitioning part (41) of the third member (23) except for the parts near the left and right ends, the first space (38) and the second space (38) of the refrigerant outlet header part (6) are provided. 39), a plurality of rectangular refrigerant passage holes (48) are formed at intervals in the left-right direction. The rectangular refrigerant passage hole (48) is formed in the bulging end wall of the bulging portion (47).

  And the inlet header main body which both ends opened by the front header formation part (27) (32) of the 1st member (21) and the 2nd member (22), and the front partition part (37) of the 3rd member (23) (5A) is formed by the rear header forming portions (28), (33) of the first member (21) and the second member (22) and the rear partition portion (41) of the third member (23). An outlet header main body (6A) having both ends opened is formed. That is, the front header forming portions (27) and (32) and the front partitioning portion (37) of the inlet header body (5A), and the rear header forming portions (28) and (33) and the rear header portion (6A) Each of the side partition portions (41) is integrated.

  The left end member (24) has a front cap (24a) for closing the left end opening of the inlet header body (5A) and a rear cap (24b) for closing the left end opening of the outlet header body (6A). ing. The front cap (24a) of the left end member (24) is formed with a protrusion (53) that fits in the first space (35) and a protrusion (54) that fits in the second space (36). Similarly, the rear cap (24b) is formed with a protruding portion (55) fitted into the first space (38) and a protruding portion (56) fitted into the second space (39).

  The right end member (25) has a front cap (25a) for closing the right end opening of the inlet header body (5A), and a rear cap (25b) for closing the right end opening of the outlet header body (6A). ing. The front cap (25a) of the right end member (25) is formed with a protrusion (57) fitted into the first space (35) and a protrusion (58) fitted into the second space (36). Similarly, the rear cap (25b) is formed with a protrusion (59) that fits into the first space (38) and a protrusion (61) that fits into the second space (39). A refrigerant inlet (8) is formed in the protruding end wall of the upper protrusion (57) of the front cap (25a) in the right end member (25), and the protrusion of the upper protrusion (59) of the rear cap (25b) is also formed. A refrigerant outlet (9) is formed in the end wall.

  The joint plate (26) has a refrigerant inflow part (62) communicating with the refrigerant inlet (8) of the right end member (25) and a refrigerant outflow part (63) communicating with the refrigerant outlet (9). One end of the refrigerant inlet pipe (11) is inserted into the refrigerant inflow part (62) of the joint plate (26) and brazed, and similarly, one end of the refrigerant outlet pipe (12) is connected to the refrigerant outflow part (63). It is inserted and brazed.

  The second header tank (3) has substantially the same configuration as the first header tank, and is disposed upside down with respect to the first header tank (2). .

  In addition, the header forming portions (27) and (28) of the first member (21) of the second header tank (3) form the upper portions of the first intermediate header portion (13) and the second intermediate header portion (14). The header forming parts 32 and 33 of the second member 22 form the lower part of the first intermediate header part 13 and the second intermediate header part 14. The first partition (37) of the third member (23) has a first space (35) having the same configuration as the first space (35) of the refrigerant inlet header (5) in the first intermediate header (13). ) And the heat exchange pipes of the front heat exchange pipe group (17) (similar to the second space (36) of the refrigerant inlet header (5)) and located above the first space (35). 16) is divided into a second space (36). Also, the first partition having the same configuration as the first space (38) of the refrigerant outlet header (6) is formed in the second intermediate header (14) by the rear partition (41) of the third member (23). The space (38) is located on the upper side of the first space (38) and has the same configuration as that of the second space (36) of the refrigerant inlet header (5) and the rear heat exchange tube group (17). It is partitioned into a second space (39) through which the heat exchange pipe (16) communicates. Further, a connecting portion (15) is formed by the connecting walls (29), (34) and (42) of the first to third members (21), (22) and (23).

  And the 1st intermediate header which both ends opened by the front side header formation part (27) (32) of the 1st member (21) and the 2nd member (22), and the front side partition part (37) of the 3rd member (23) The main body (13A) is formed, the rear header forming portions (28), (33) of the first member (21) and the second member (22), and the rear partition portion (41) of the third member (23). Thus, the second intermediate header body (14A) having both ends opened is formed. That is, the front header forming portions (27) and (32) and the front partitioning portion (37) of the first intermediate header portion main body (13A) and the rear header forming portion (28) of the second intermediate header portion main body (14A) ( 33) and the rear partition (41) are integrated with each other.

  The refrigerant inlet (8) of the right end member (25) serves as a refrigerant outlet from which refrigerant flows out of the first intermediate header portion (13), and the refrigerant outlet (9) also extends from the first intermediate header portion (13). The refrigerant that has flowed out serves as a refrigerant inlet into which the second intermediate header portion (14) flows.

  As shown in FIGS. 2, 3, 7 and 8, the second header tank (3) is different from the first header tank (2) as follows.

  The first difference is that the front partition part (37) of the third member (23) is not formed with a slit (43), a linear cutting part (44), and a deformation part (45), and the front partition part (37), by deforming the front partition (37), a plurality of bulging portions (64) that are long in the front-rear direction and bulge upward are formed at intervals in the left-right direction. ing. The bulging portion (64) is formed between the heat exchange tubes (16) adjacent in the left-right direction. Further, the upper and lower spaces (35) of the first intermediate header portion (13) are disposed between the adjacent bulging portions (64) in the front side expression portion (37) and on the outer sides in the left-right direction of the bulging portions (64) at both left and right ends. (36) A long communication hole (65) is formed in the front-rear direction.

  The second difference is that a square refrigerant passage hole (48) is not formed in the rear partitioning portion (41) of the third member (23), and some of the plurality of bulging portions (47) The circular communication hole (66) is formed in a penetrating manner in the front portion of the bulging end wall of the bulging portion (47). The distance between adjacent circular communication holes (66) gradually increases as the distance from the right end increases.

  The third difference is that the second intermediate header portion (on the lower portion of the peripheral edge of the refrigerant inlet (9) in the lower protrusion (59) of the rear cap (25b) of the right end member (25) is formed. 14) A guide portion (68) that is inclined or curved upward inward, that is, curved here, is integrally formed. The guide part (68) guides the refrigerant flowing into the first space (38) of the second intermediate header part (14) upward.

  The fourth difference is that a chevron-shaped projecting portion (71) projecting upward is integrally formed at the center in the front-rear direction of the upper edge of the right end member (25).

  The fifth difference is that the right end member (25) is not brazed with the joint plate (26), and the outer surface of the right end member (25) is arranged in the first intermediate header (13) and in the second end. The aluminum communicating member (72) to be passed through the intermediate header portion (14) is brazed. The communication member (72) is formed with an outward bulging portion (73) so as to pass through the refrigerant outlet (8) and the refrigerant inlet (9) of the right end member (25). The inside of the outward bulge portion (73) serves as a communication path through which the refrigerant outlet (8) and the refrigerant inlet (9) of the right end member (25) are passed.

  The above-described evaporator (1) is manufactured by combining all parts except the inlet pipe (11) and the outlet pipe (12) and brazing them together.

  The evaporator (1) constitutes a refrigeration cycle using a chlorofluorocarbon refrigerant together with a compressor and a condenser as a refrigerant cooler, and is mounted on a vehicle such as an automobile as a car air conditioner.

  In the evaporator (1) described above, when the compressor is turned on, the gas-liquid mixed-phase two-phase refrigerant that has passed through the compressor, the condenser, and the expansion valve flows from the refrigerant inlet pipe (11) to the refrigerant inflow portion of the joint plate (26). (62) passes through the refrigerant inlet (8) of the right end member (25) and enters the first space (35) of the refrigerant inlet header (5). The refrigerant that has entered the first space (35) flows in the length direction of the refrigerant inlet header (5) through the first space (35), passes through the slit (43), and enters the second space (36). It flows in, diverts, and flows into the heat exchange pipe (16) of the front heat exchange pipe group (17). The refrigerant flowing into the second space (36) from the first space (35) through the front slit (43) hits the front side wall of the refrigerant inlet header (5) and then flows so as to spread in the left-right direction. The refrigerant flowing into the heat exchange pipe (16) and flowing into the second space (36) from the first space (35) through the rear slit (43) hits the rear wall of the refrigerant inlet header (5). After that, since it flows into the heat exchange pipe (16) while flowing so as to spread in the left-right direction, the refrigerant easily flows into the heat exchange pipe (16) located away from the slit (43), and the refrigerant inlet The distribution of the refrigerant to the total heat exchange pipe (16) connected to the header section (5) is made uniform.

  The refrigerant flowing into the heat exchange pipe (16) flows downward in the heat exchange pipe (16) and enters the second space (36) of the first intermediate header portion (13) of the second header tank (3). enter. The refrigerant that has entered the second space (36) of the first intermediate header portion (13) passes through the communication hole (65) of the front partitioning portion (37) of the third member (23), and thus the first space (35). The refrigerant flows into the first space (35) to the right, flows into the right end member (25), the refrigerant outlet (8) of the front cap (25a), and the outward bulge (73) of the communication member (72). ) And through the refrigerant inlet (9) of the rear cap (25b) to turn to change the flow direction and enter the first space (38) of the second intermediate header (14). .

  The refrigerant that has entered the first space (38) of the second intermediate header (14) flows to the left and passes through the circular communication hole (66) of the rear partition (41) of the third member (23). The air enters the second space (39), is divided, and flows into the heat exchange pipe (16) of the rear heat exchange pipe group (17).

  The refrigerant that has flowed into the heat exchange pipe (16) flows upward in the heat exchange pipe (16) and enters the second space (39) of the refrigerant outlet header (6), and reaches the third member (23). It enters the first space (38) through the rectangular refrigerant passage hole (48) of the rear partition (41).

  The refrigerant that has entered the first space (38) of the refrigerant outlet header (6) flows to the right, and the refrigerant outlet (9) of the rear cap (25b) of the right end member (25) and the joint plate (26). It passes through the refrigerant outlet (63) and flows out to the refrigerant outlet pipe (12).

  While the refrigerant flows in the heat exchange pipe (16) of both the front and rear heat exchange pipe groups (17), the refrigerant exchanges heat with the air passing through the ventilation gap of the heat exchange core section (4). And leaked.

  FIG. 9 shows a first modification of the slit that allows the first space (35) and the second space (36) of the refrigerant inlet header (5) to pass through.

  In FIG. 9, the length direction of the front side portion (leeward side portion) and the rear side portion (windward side portion) of the front partitioning portion (37) of the third member (23) of the first header tank (2) is set respectively. A slit (80) (communication portion) that faces in the left-right direction (the length direction of the refrigerant inlet header (2)) and passes through the first space (35) and the second space (36) of the refrigerant inlet header (5) ) Are formed at intervals in the left-right direction. The slit (80) extends in the left-right direction on the front partition (37), and a pair of two linear cutting portions (81) formed at intervals in the front-rear direction (ventilation direction) A plurality of lines are formed at intervals, and a portion between each pair of linear cut portions (81) in the front partition (37) is deformed upward. The upward deformed portion is indicated by (82). The front slit (80) opens to the leeward side above the upper surface of the front partition (37), and the rear slit (80) extends to the leeward side above the upper surface of the front partition (37). It is open.

  In the case of the slit (80) shown in FIG. 9, the refrigerant that has entered the second space (36) from the first space (35) through the slit (80) flows into the left and right direction after colliding with each other. However, since the refrigerant flows into the heat exchange pipe (16), the refrigerant easily flows into the heat exchange pipe (16) at a position away from the slit (43), and all the refrigerant connected to the refrigerant inlet header (5). The distribution of the refrigerant to the heat exchange pipe (16) is made uniform.

  FIG. 10 shows a second modification of the slit that allows the first space (35) and the second space (36) of the refrigerant inlet header (5) to pass through.

  In FIG. 10, the length direction is set to the left-right direction (refrigerant inlet header part (2) in the rear part (windward part) in the front partition part (37) of the 3rd member (23) of the 1st header tank (2). ) And a slit (85) (communication portion) that passes through the first space (35) and the second space (36) of the refrigerant inlet header portion (5) is spaced in the left-right direction. A plurality are formed. The slit (85) has a plurality of linear cut portions (86) extending in the left-right direction at the rear side portion (windward side portion) of the front partition portion (37). A portion on the front side (leeward side) of each linear cutting portion (86) in 37) is deformed downward. The downward deformation portion is indicated by (87). The slit (85) opens to the windward side below the lower surface of the front partition (37).

  In the case of the slit (85) shown in FIG. 10, the refrigerant that has entered the second space (36) from the first space (35) through the slit (85) hits the rear side wall of the refrigerant inlet header (5). After that, since it flows into the heat exchange pipe (16) while flowing so as to spread in the left-right direction, the refrigerant easily flows into the heat exchange pipe (16) located away from the slit (43), and the refrigerant inlet The distribution of the refrigerant to the total heat exchange pipe (16) connected to the header section (5) is made uniform.

  The heat exchanger according to the present invention is suitably used as an evaporator of a refrigeration cycle constituting a car air conditioner.

(1): Evaporator (heat exchanger)
(2): First header tank
(5): Refrigerant inlet header
(6): Refrigerant outlet header
(8): Refrigerant inlet
(9): Refrigerant outlet
(16): Heat exchange pipe
(21): First member
(22): Second member
(23): Third member
(24): Left end member
(25): Right end member
(35): 1st space
(36): Second space
(37): Front partition
(38): 1st space
(39): Second space
(41): Rear partition
(43) (80) (85): Slit (communication part)
(44) (81) (86): Linear cutting part
(45) (82) (87): Deformation part

Claims (3)

A refrigerant inlet header portion having a length direction in a vertical direction and a direction perpendicular to the ventilation direction and having a refrigerant inlet, and a length direction in the vertical direction and a distance in the length direction of the refrigerant inlet header portion And a plurality of heat exchange pipes connected to the refrigerant inlet header portion, and the refrigerant inlet header portion is partitioned into first and second spaces arranged vertically by a partitioning portion, The refrigerant inlet communicates with the first space and the heat exchange pipe faces the second space, and the refrigerant flows into the second space from the first space through the communication portion provided in the partition portion. In the heat exchanger in which a plurality of the communication parts are provided at intervals in the length direction of the refrigerant inlet header part ,
The communication portion includes a slit formed in the partition portion with the length direction directed in the length direction of the refrigerant inlet header portion, and each communication portion has a first space while flowing the refrigerant in the width direction of the refrigerant inlet header portion. from being adapted to flow into the second space,
A pair of two linear cut portions formed on the partition portion in the length direction of the refrigerant inlet header portion and spaced in the ventilation direction is spaced in the length direction of the refrigerant inlet header portion. By forming a plurality of portions between the linear cut portion pairs in the partition portion upward, the slits whose length direction is directed in the length direction of the refrigerant inlet header portion are the windward portion of the partition portion and A plurality of heat exchangers formed at intervals in the length direction of the refrigerant inlet header portion on the leeward side portion . A refrigerant inlet header is disposed between the first member to which the heat exchange pipe is connected, the second member that covers the upper side of the first member, and the first member and the second member, and the first and second members. The heat exchanger according to claim 1, further comprising: a third member that is brazed and has a partition portion that divides the inside of the refrigerant inlet header portion into first and second spaces . On the windward side of the refrigerant inlet header portion, a refrigerant outlet header portion whose length direction is directed in a vertical direction and a direction perpendicular to the ventilation direction is integrally provided, and the length direction is directed to the refrigerant outlet header portion in the vertical direction. In addition, a plurality of heat exchange tubes arranged at intervals in the length direction of the refrigerant outlet header are connected, a refrigerant outlet is provided at one end of the refrigerant outlet header, and the other end is closed. The inside of the outlet header is partitioned into first and second spaces arranged vertically by the partition, a coolant passage hole is formed through the partition and the first and second spaces are formed, and the coolant outlet is in the first space. As well as a heat exchange tube facing the second space,
The refrigerant inlet header portion and the refrigerant outlet header portion are provided in one header tank, and the header tank includes a first member to which the heat exchange pipe is connected, a second member that covers the upper side of the first member, A third member disposed between the first member and the second member and brazed to the first and second members; an end member brazed to both ends of the first member, the second member and the third member; The first and second members are provided with header forming portions that form the refrigerant inlet header portion and the refrigerant outlet header portion, respectively, and the third member has the first and second portions inside the refrigerant inlet header portion and the refrigerant outlet header portion, respectively. Two partition portions partitioned into the second space are provided, a refrigerant inlet and a refrigerant outlet are formed in one of the end members, and a communication portion is formed in the partition portion of the refrigerant inlet header portion in the third member. Item 1 Heat exchanger 2 wherein.

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