JP2005195316A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger having improved heat exchanging performance when particularly used as an evaporator. <P>SOLUTION: On the lower side of a heat exchange core part, two right and left refrigerant turning tanks 3A, 3B are arranged which have refrigerant flow-in header parts 7A, 7B and refrigerant flow-out header parts 8A, 8B. A refrigerant flow crossing device 42 is provided between both tanks 3A, 3B. The refrigerant flow crossing device 42 consists of a body block 43 having recesses 44 on both right and left sides into which the ends of both tanks 3A, 3B are fitted, and flow direction changing plates 46A, 46B arranged between each of the end faces of both tanks 3A, 3B and each of the bottom faces of both recesses 44. The block 43 has two communication holes 45A, 45B for communicating upper and lower portions of both recesses 44 with each other. Both changing plates 46A, 46B have through-holes 47, 48, 49, 51 for communicating the refrigerant flow-in header part 7A of the left tank 3A with the refrigerant flow-out header part 8B of the right tank 3B and the refrigerant flow-out header part 8A of the left tank 3A with the refrigerant flow-in header part 7B of the right tank 3B, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum. Further, in this specification, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIG. 1, the right side in FIG. 5) is the front, and the opposite side is the rear. The left and right (left and right in FIG. 2) when viewing the front from the rear are referred to as left and right.

  Conventionally, as a evaporator for a car air conditioner, a plurality of flat hollow bodies formed by brazing peripheral edges with a pair of plate-shaped plates facing each other are arranged in parallel, and a corrugated fin with a louver between adjacent flat hollow bodies A so-called laminated evaporator, in which the above is disposed and brazed to a flat hollow body, has been widely used. However, in recent years, there has been a demand for further reduction in size and weight and performance of the evaporator.

  As an evaporator satisfying such a requirement, the present applicant firstly arranged two rows of heat exchange tube groups, each of which is composed of a plurality of heat exchange tubes arranged at intervals, arranged in the ventilation direction. It is provided with a configured heat exchange core part, a refrigerant inlet / outlet tank arranged on the upper end side of the heat exchange core part, and a refrigerant turn tank arranged on the lower end side of the heat exchange core part. The inside of the tank is partitioned into a refrigerant inlet header portion and a refrigerant outlet header portion arranged in the ventilation direction by the partition wall, and a refrigerant inflow header portion and a refrigerant outflow header portion in which the refrigerant turn tank is arranged in the ventilation direction by the partition wall A plurality of refrigerant passage holes are formed in the partition wall of the refrigerant turn tank at intervals in the length direction, and the upper end portion of the heat exchange pipe of the front heat exchange pipe group is formed on the refrigerant inlet header section and the rear side. On the heat exchange tube of the heat exchange tube group Are connected to the refrigerant outlet header portion, the lower end portion of the heat exchange tube of the front heat exchange tube group is in the refrigerant inflow header portion, and the lower end portion of the heat exchange tube of the rear heat exchange tube group is the refrigerant outflow header portion The refrigerant flowing into the refrigerant inlet header of the refrigerant inlet / outlet tank flows into the refrigerant inlet header of the refrigerant turn tank through the heat exchange pipe of the front heat exchange pipe group, and then the partition wall Proposed an evaporator that flows into the refrigerant outflow header through the refrigerant passage hole and then flows into the refrigerant outlet header of the refrigerant inlet / outlet tank through the heat exchange pipe of the rear heat exchange pipe group. (See Patent Document 1). In this evaporator, the refrigerant inlet of the refrigerant inlet header and the refrigerant outlet of the refrigerant outlet header are formed at the same end of the refrigerant inlet / outlet tank, or at the central portion in the length direction of the refrigerant inlet / outlet tank. It is formed at a position close to the length direction.

However, as a result of various studies by the present inventor, the evaporator described in Patent Document 1 usually has sufficient heat exchange performance, but when further improvement in heat exchange performance is required, the requirement cannot be satisfied. Turned out to be. That is, when the refrigerant inlet of the refrigerant inlet header part and the refrigerant outlet of the refrigerant outlet header part are formed at the same end of the refrigerant inlet / outlet tank, or in the longitudinal direction of the refrigerant inlet / outlet tank in the longitudinal direction When the refrigerant flows from the refrigerant inlet to the refrigerant outlet, a large amount of refrigerant flows in the heat exchange pipes in positions near the refrigerant inlet and the refrigerant outlet in the front and rear heat exchange pipe groups, The refrigerant circulation amount in the heat exchange pipe in the other part may be reduced. Therefore, the length of the circulation path of the refrigerant passing through the evaporator becomes non-uniform, the pressure distribution becomes non-uniform, and the refrigerant circulation amount of all the heat exchange pipes becomes non-uniform. As a result, the temperature of the air that has passed through the heat exchange core portion also becomes non-uniform depending on the location. In addition, the refrigerant flow rate of the heat exchange tubes in the same position in the left and right direction in the front and rear heat exchange tube groups tend to be approximately the same, that is, in the portion where the amount of refrigerant flowing through the heat exchange tubes of the front heat exchange tube group is small, The amount of refrigerant flowing through the heat exchange pipe of the rear heat exchange pipe group located in the same position as the heat exchange pipe in the left-right direction is small, and in the same way as this, the amount of refrigerant flowing through the heat exchange pipe of the front heat exchange pipe group is large, Since the amount of refrigerant flowing through the heat exchange tubes of the rear heat exchange tube group located at the same position in the left-right direction as the heat exchange tubes tends to increase, the amount of refrigerant contributing to heat exchange is related to the left-right direction of the heat exchange core portion. As a result, the temperature of the air that has passed through the heat exchange core is also uneven depending on the location. Furthermore, the refrigerant flowing into the refrigerant inflow header is a mixed phase of a liquid phase and a gas phase, but most of the mixed phase refrigerant flows directly into the refrigerant outflow header through the refrigerant passage hole, and further Since the refrigerant flows into the heat exchange pipe of the side heat exchange pipe group, the liquid phase refrigerant and the gas phase refrigerant are not efficiently mixed in the refrigerant inflow header part and the refrigerant outflow header part and pass through the heat exchange core part. The temperature of the incoming air is uneven depending on the location. And in any case, it turned out that the further improvement effect of the heat exchange performance of an evaporator is not fully acquired.
Japanese Patent Laid-Open No. 2003-75024

  The object of the present invention is to solve the above-mentioned problems and to provide a heat exchanger excellent in heat exchanging performance particularly when used as an evaporator.

  In order to solve the above-mentioned problems, the present invention comprises the following aspects.

  1) A heat exchange core group composed of a plurality of heat exchange tubes arranged at intervals and arranged in a plurality of rows side by side in the ventilation direction, and arranged on one end side of the heat exchange tube And a refrigerant inlet header portion to which heat exchange tubes of at least one row of heat exchange tube groups are connected, and arranged at the rear side of the refrigerant inlet header portion on one end side of the heat exchange tubes, and at least one row of heat exchange The refrigerant outlet header part to which the heat exchange pipe of the tube group is connected, and the heat exchange pipe arranged in the left-right direction on the other end side of the heat exchange pipe and connected to the refrigerant inlet header part are connected 2 Heat exchange between two refrigerant inflow header portions and a heat exchange tube group arranged in the left-right direction behind the two refrigerant inflow header portions on the other end side of the heat exchange tube and connected to the refrigerant outlet header portion Two refrigerant outflow headers connected to the pipe, Inflow header and the right of the refrigerant outflow header section of the left and right inflow header and the heat exchanger and the refrigerant outflow header section of the left side are communicated with each.

  2) The heat exchanger according to 1) above, wherein a refrigerant inlet is formed at one end of the refrigerant inlet header, and a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header.

  3) The heat exchanger according to 1) or 2), wherein the left refrigerant inflow header portion and the refrigerant outflow header portion, and the right refrigerant inflow header portion and the refrigerant outflow header portion are provided in one tank, respectively.

  4) Refrigerant that connects the refrigerant inflow header portion of the left tank and the refrigerant outflow header portion of the right tank, and the refrigerant inflow header portion of the right tank and the refrigerant outflow header portion of the left tank, respectively, between the left tank and the right tank. The heat exchanger according to 3) above, wherein a flow cross device is provided.

  5) A main body block having a recess for fitting the right end portion of the left tank and the left end portion of the right tank on the left and right sides of the refrigerant flow cross device, and the end faces of the left and right tanks respectively fitted in the both recesses of the main body block And a flow direction switching plate disposed between the bottoms of the two recesses, and two long communication in the front-rear direction for communicating the upper part and the lower part of the left and right recesses with the main body block. Holes are formed at intervals in the vertical direction, and both flow direction switching plates are provided with a refrigerant inflow header portion of the left tank and a refrigerant outflow header portion of the right tank, and a refrigerant outflow header portion of the left tank and a refrigerant inflow header of the right tank. The heat exchanger according to 4) above, wherein through-holes are formed so as to communicate with the respective parts.

  6) Let the left flow direction switching plate pass through the through hole that passes through the refrigerant inflow header portion of the left tank and one communication hole of the main body block, and the refrigerant outflow header portion of the left tank and the other communication hole of the main body block. A through hole is formed, and the right flow direction switching plate is passed through the refrigerant inflow header portion of the right tank and the other communication hole of the main body block, and the refrigerant outflow header portion of the right tank and the one of the main body block The heat exchanger according to 5) above, wherein a through hole is formed through the communication hole.

  7) The above 3) to 3), wherein the left and right tanks are each composed of a first member to which a heat exchange pipe is connected and a second member brazed to a portion of the first member opposite to the heat exchange pipe. The heat exchanger according to any one of 6).

  8) The heat exchanger according to 7) above, wherein the first member is made of an aluminum brazing sheet having a brazing filler metal layer on at least one side.

  9) The heat exchanger according to 7) or 8) above, wherein the second member is made of an aluminum extruded profile.

  10) The heat exchanger according to any one of 5) to 9), wherein the main body block is made of an aluminum bare material, and the flow direction switching plate is made of an aluminum brazing sheet having a brazing filler metal layer on both sides.

  11) The refrigerant outlet header is partitioned into two spaces in the height direction by the dividing means, a heat exchange pipe is connected so as to face the first space, a refrigerant passage hole is formed in the dividing means, and the refrigerant outlet The heat exchanger according to any one of 1) to 10), wherein the refrigerant flows out from the second space of the header portion.

  12) The heat exchanger according to 11) above, wherein the refrigerant inlet header and the refrigerant outlet header are provided in one refrigerant inlet / outlet tank.

  13) The refrigerant inlet / outlet tank includes a first member to which the heat exchange pipe is connected and a second member brazed to a portion of the first member opposite to the heat exchange pipe. The heat exchanger as described in 12) above, which is integrally formed with the member.

  14) The heat exchanger according to 13) above, wherein the first member comprises an aluminum brazing sheet having a brazing filler metal layer on at least one side.

  15) The heat exchanger according to 13) or 14) above, wherein the second member is made of an aluminum extruded profile.

16) The heat exchanger according to any one of 1) to 15) above, wherein each heat exchange tube group of the heat exchange core portion includes seven or more heat exchange tubes.
17) A refrigeration cycle comprising a compressor, a condenser, and the heat exchanger described in any one of 1) to 16) above.

  18) A vehicle in which the refrigeration cycle described in 17) above is mounted as an air conditioner.

  According to the heat exchanger of 1) above, when the refrigerant that has flowed into the refrigerant inlet header portion from the refrigerant inlet flows to the refrigerant outlet of the refrigerant outlet header portion, the refrigerant that has flowed into the left refrigerant inflow header portion from the heat exchange pipe is After flowing in the length direction of the left refrigerant inflow header portion, it enters the right refrigerant outflow header portion and flows into the refrigerant outlet header portion through the heat exchange pipe. On the other hand, the refrigerant flowing into the right refrigerant inflow header from the heat exchange pipe flows in the length direction of the right refrigerant inflow header, then enters the left refrigerant outflow header, passes through the heat exchange pipe, and enters the refrigerant outlet header. Flows into and exits from the refrigerant outlet. Therefore, the length of the circulation path of the refrigerant passing through the heat exchanger is made equal to that of the evaporator described in Patent Document 1, the pressure distribution is made uniform, and the refrigerant circulation amount of all the heat exchange tubes is made uniform. Is done. Therefore, the temperature of the air that has passed through the heat exchange core is also made uniform as a whole, and the heat exchange performance is improved. In addition, when the refrigerant circulation amount of the plurality of heat exchange tubes connected to the left refrigerant inflow header portion is reduced and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant inflow header portion is large, the left refrigerant outflow The refrigerant circulation amount of the plurality of heat exchange tubes connected to the header portion increases, and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant outflow header portion decreases. Connected to the left refrigerant outflow header section when the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the inflow header section increases and the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the right side refrigerant inflow header section is small The amount of refrigerant flowing through the plurality of heat exchange tubes is reduced, and the amount of refrigerant flowing through the plurality of heat exchange tubes connected to the right refrigerant outflow header is increased. Therefore, the amount of refrigerant that contributes to heat exchange is made uniform in the left-right direction of the heat exchange core, and as a result, the temperature of the air that has passed through the heat exchange core is also made uniform overall, improving heat exchange performance. To do. Further, the refrigerant flowing into the refrigerant inflow header portion is mixed when the refrigerant flows into the right refrigerant outflow header portion from the left refrigerant inflow header portion and when it flows into the left refrigerant outflow header portion from the right refrigerant inflow header portion. The Therefore, when used as an evaporator, the liquid-phase refrigerant and the gas-phase refrigerant are efficiently mixed, the dryness is made uniform throughout, and the temperature of the air passing through the heat exchange core is made uniform overall. As a result, the cooling performance, that is, the heat exchange performance is remarkably improved.

  When the refrigerant inlet is formed at one end of the refrigerant inlet header portion and the refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header portion as in the heat exchanger of 2) above, Patent Document 1 describes In the evaporator, there is a tendency that a large amount of the refrigerant flows in the heat exchange pipes in positions near the refrigerant inlet and the refrigerant outlet in the front and rear heat exchange pipe groups, and the amount of the refrigerant flowing through the heat exchange pipes in other parts is reduced. strong. However, even in such a case, the length of the flow path of the refrigerant passing through the heat exchanger is longer than that of the evaporator described in Patent Document 1 when configured like the heat exchanger of 1) above. Are equalized, the pressure distribution is made uniform, and the refrigerant circulation amount of all the heat exchange tubes is made uniform. Therefore, the temperature of the air that has passed through the heat exchange core is also made uniform as a whole, and the heat exchange performance is improved. In addition, when the refrigerant circulation amount of the plurality of heat exchange tubes connected to the left refrigerant inflow header portion is reduced and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant inflow header portion is large, the left refrigerant outflow The refrigerant circulation amount of the plurality of heat exchange tubes connected to the header portion increases, and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant outflow header portion decreases. Connected to the left refrigerant outflow header section when the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the inflow header section increases and the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the right side refrigerant inflow header section is small The amount of refrigerant flowing through the plurality of heat exchange tubes is reduced, and the amount of refrigerant flowing through the plurality of heat exchange tubes connected to the right refrigerant outflow header is increased. Therefore, the amount of refrigerant that contributes to heat exchange is made uniform in the left-right direction of the heat exchange core, and as a result, the temperature of the air that has passed through the heat exchange core is also made uniform overall, improving heat exchange performance. To do.

  According to the heat exchanger of 3) above, the number of parts of the entire heat exchanger can be reduced.

  According to the heat exchangers 4) to 6), the left refrigerant inflow header portion and the right refrigerant outflow header portion, and the right refrigerant inflow header portion and the left refrigerant outflow header portion are communicated with each other with a relatively simple configuration. Can do.

  According to the heat exchanger of the above 7), the number of parts is reduced.

  According to the heat exchanger of the above 8), using the brazing material layer on at least one side of the first member and brazing the first member and the second member to form a tank, the first member and Since the heat exchange pipe can be brazed and connected to the tank, the manufacturing operation is simplified.

  According to the heat exchanger of 9) above, the second member can be easily manufactured.

  According to the heat exchanger of 10) above, the main body block and the flow direction switching plate, the tank, the flow direction switching plate and the main body block can be brazed simultaneously using the brazing material layer of the flow direction switching plate. Therefore, the manufacturing work is simplified. Moreover, in the case of having the configuration of 8), these brazings can be performed simultaneously with the brazing of the first member and the second member and the brazing of the first member and the heat exchange tube.

  According to the heat exchanger of 11) above, due to the function of the partitioning means, the refrigerant circulation amount of all the heat exchange pipes connected to the refrigerant inlet header part and all the heat exchange pipes connected to the refrigerant outlet header part is uniform. Therefore, the heat exchange performance of the heat exchanger is further improved.

  According to the heat exchanger of 12) above, the number of parts in the entire heat exchanger can be reduced.

  According to the heat exchanger of the above 13), since the partition means for the refrigerant inlet / outlet tank is formed integrally with the second member, the operation of providing the partition means in the refrigerant inlet / outlet tank is simplified.

  According to the heat exchanger of 14) above, the first member and the second member are brazed to form the refrigerant inlet / outlet tank using the brazing material layer on at least one side of the first member. Since one member and the heat exchange pipe can be brazed to connect the heat exchange pipe to the refrigerant turn-in / out tank, the manufacturing operation is simplified.

  According to the heat exchanger of 15) above, the second member of the refrigerant inlet / outlet tank can be manufactured relatively easily.

  When each heat exchange tube group is composed of seven or more heat exchange tubes as in the heat exchanger of the above 16), in the evaporator described in Patent Document 1, a large amount of refrigerant flows into the refrigerant inlets in the front and rear heat exchange tube groups. In addition, the amount of the refrigerant flowing in the heat exchange pipe close to the refrigerant outlet and flowing through the heat exchange pipe in the other part tends to decrease. However, even in such a case, when configured as the heat exchangers 1) to 15) above, the length of the flow path of the refrigerant passing through the heat exchanger is described in Patent Document 1. Compared to the evaporator, the length is equalized, the pressure distribution is made uniform, and the refrigerant circulation amount in all the heat exchange tubes is made uniform. Therefore, the temperature of the air that has passed through the heat exchange core is also made uniform as a whole, and the heat exchange performance is improved. In addition, when the refrigerant circulation amount of the plurality of heat exchange tubes connected to the left refrigerant inflow header portion is reduced and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant inflow header portion is large, the left refrigerant outflow The refrigerant circulation amount of the plurality of heat exchange tubes connected to the header portion increases, and the refrigerant circulation amount of the plurality of heat exchange tubes connected to the right refrigerant outflow header portion decreases. Connected to the left refrigerant outflow header section when the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the inflow header section increases and the refrigerant circulation quantity of the plurality of heat exchange pipes connected to the right side refrigerant inflow header section is small The amount of refrigerant flowing through the plurality of heat exchange tubes is reduced, and the amount of refrigerant flowing through the plurality of heat exchange tubes connected to the right refrigerant outflow header is increased. Therefore, the amount of refrigerant that contributes to heat exchange is made uniform in the left-right direction of the heat exchange core, and as a result, the temperature of the air that has passed through the heat exchange core is also made uniform overall, improving heat exchange performance. To do.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the top and bottom of FIGS. 1 and 2 are referred to as the top and bottom.

  1 and 2 show the overall configuration of an evaporator to which the present invention is applied, FIGS. 3 to 8 show the configuration of the main part, and FIG. 9 shows how the refrigerant flows in the evaporator shown in FIG.

  1 and 2, the evaporator (1) includes an aluminum refrigerant tank (2) and two aluminum refrigerant turn tanks arranged on the left and right sides below the refrigerant tank (2). (3A) and (3B), and a heat exchange core section (4) disposed between the refrigerant in / out tank (2) and the refrigerant turn tank (3A) (3B).

  The refrigerant inlet / outlet tank (2) includes a refrigerant inlet header portion (5) located on the front side (downstream side in the ventilation direction) and a refrigerant outlet header portion (6) located on the rear side (upstream side in the ventilation direction). . Each of the refrigerant turn tanks (3A) (3B) includes a refrigerant inflow header portion (7A) (7B) located on the front side and a refrigerant outflow header portion (8A) (8B) located on the rear side.

  The heat exchange core section (4) includes a plurality of rows of heat exchange pipe groups (11) composed of a plurality of aluminum heat exchange pipes (9) arranged in parallel at intervals in the left-right direction. Here, two rows are arranged. The ventilation gaps between adjacent heat exchange tubes (9) in each heat exchange tube group (11) and the outside of the heat exchange tubes (9) at the left and right ends of each heat exchange tube group (11) are made of aluminum. A louvered corrugated fin (12) is arranged and brazed to the heat exchange tube (9). Aluminum side plates (13) are respectively arranged outside the corrugated fins (12) at the left and right ends and brazed to the corrugated fins (12). The upper and lower ends of the heat exchange pipe (9) located in the left half of the front heat exchange pipe group (11) are the refrigerant inlet header part (5) and the refrigerant inflow header part of the left refrigerant turn tank (3A) ( 7A) and the upper and lower ends of the heat exchange pipe (9), also located in the right half, are connected to the refrigerant inlet header (5) and the refrigerant inflow header (7B) of the right refrigerant turn tank (3B). Has been. The upper and lower ends of the heat exchange pipe (9) located in the left half of the rear heat exchange pipe group (11) are the refrigerant outlet header part (6) and the refrigerant outflow header part of the left refrigerant turn tank (3A). The upper and lower ends of the heat exchange pipe (9), also connected to (8A) and located in the right half, are connected to the refrigerant outlet header (6) and the refrigerant outlet header (8B) of the right refrigerant turn tank (3B). It is connected.

  As shown in FIGS. 3 and 5, the refrigerant inlet / outlet tank (2) is a plate-shaped first member (formed from an aluminum brazing sheet having a brazing filler metal layer on both sides and connected to a heat exchange pipe (9)). 14), a second member (15) made of a bare material formed of an extruded aluminum material and covering the upper side of the first member (14), and an aluminum cap (16) (17) that closes both left and right openings And more.

  The first member (14) has, on both front and rear side portions thereof, a curved portion (18) having a small cross-sectional arc shape with a central portion protruding downward. A plurality of tube insertion holes (19) that are long in the front-rear direction are formed in each bending portion (18) at intervals in the left-right direction. The tube insertion holes (19) of the front and rear curved portions (18) are at the same position in the left-right direction. A rising wall (18a) is integrally formed over the entire length at the front edge of the front curved portion (18) and the rear edge of the rear curved portion (18). A plurality of through holes (22) are formed in the flat portion (21) between the curved portions (18) of the first member (14) at intervals in the left-right direction.

  The second member (15) has a substantially m-shaped cross section opened downward, and is provided at the center between the front and rear walls (23) and the front and rear walls (23) extending in the left-right direction and extending in the left-right direction. A partition wall (24) as a partition means for partitioning the refrigerant inlet / outlet tank (2) into two front and rear spaces, and upper ends of the front and rear walls (23) and the upper end of the partition wall (24) are integrally connected to each other. And two projecting substantially arc-shaped connecting walls (25). The lower end portions of the rear wall (23) and the partition wall (24) are divided as partition means for partitioning the rear side of the partition wall (24) in the refrigerant inlet / outlet tank (2) into two upper and lower spaces. The diversion resistance plate (27) is integrally connected over the entire length. The shunt resistor plate (27) may be a separate member from the rear wall (23) and the partition wall (24), and may be fixed to the rear wall (23) and the partition wall (24). A plurality of refrigerant passage holes (28A) (28B) that are long in the left-right direction are formed in a penetrating manner at intervals in the left-right direction in the portion excluding the left and right ends at the rear portion of the shunt resistor plate (27). ing. The length of the refrigerant passage hole (28A) at the center in the left-right direction is shorter than the interval between the adjacent heat exchange tubes (9) in the rear heat exchange tube group (11), and the rear heat exchange tubes It is formed between two adjacent heat exchange tubes (9) at the center in the left-right direction of the group (11). The other refrigerant passage hole (28B) is longer than the central refrigerant passage hole (28A). The lower end of the partition wall (24) protrudes downward from the lower ends of the front and rear walls (23), and a plurality of lower walls protrude downward and are fitted into the through holes (22) of the first member (14). The protrusions (24a) are integrally formed with an interval in the left-right direction. The protrusion (24a) is formed by cutting a predetermined portion of the partition wall (24).

  The second member (15) is formed by extruding both the front and rear walls (23), the partition wall (24), the connecting wall (25), and the shunting resistance plate (27), and then pressing it for shunting. Manufactured by forming the coolant passage holes (28A) and (28B) in the resistance plate (27), and further cutting the partition wall (24) to form the protrusions (24a).

  Each cap (16) (17) is formed from a bare material by pressing, forging or cutting, and the left and right ends of the first and second members (14) (15) are fitted into the inner surface in the left-right direction. A recess is formed. The right cap (17) has a refrigerant inlet (17a) that communicates with the refrigerant inlet header (5) and a refrigerant outlet that communicates with the upper part of the refrigerant outlet header (6) above the shunt resistor plate (27). (17b) is formed. Also, an aluminum refrigerant inlet / outlet member (29) having a refrigerant inlet (29a) leading to the refrigerant inlet (17a) and a refrigerant outlet (29b) leading to the refrigerant outlet (17b) is brazed to the right cap (17). ing.

  Then, both the members (14) and (15) are caulked while the projections (24a) of the second member (15) are inserted into the through holes (22) of the first member (14) and are caulked. In the state where the front and rear rising walls (18a) and the front and rear walls (23) of the second member (15) are engaged, they are brazed together using the brazing material layer of the first member (14), Further, both caps (16), (17) are brazed to the first and second members (14), (15) using a sheet-like brazing material, thereby forming a refrigerant in / out tank (2). The refrigerant inlet header (5) is located on the front side of the partition wall (24) of the two members (15), and the refrigerant outlet header (6) is located on the rear side of the partition wall (24). The refrigerant outlet header (6) is divided into upper and lower spaces (6a) and (6b) by a shunt resistor plate (27), and these spaces (6a) and (6b) are formed in the refrigerant passage holes (28A) ( 28B) (see FIG. 2). The lower space (6b) is the first space where the heat exchange pipe (9) of the rear heat exchange pipe group (11) faces, and the upper space (6a) is the second space from which the refrigerant flows out. The refrigerant outlet (17b) of the right cap (17) communicates with the upper space (6a) of the refrigerant outlet header (6).

  As shown in FIGS. 4 and 5, the left and right refrigerant turn tanks (3A) and (3B) are formed of aluminum brazing sheets each having a brazing filler metal layer on both sides, and are connected to a heat exchange pipe (9). And a second member (32) made of a bare material formed from an aluminum extruded shape and covering the lower side of the first member (31). The left end opening of the left refrigerant turn tank (3A) and the right end opening of the right refrigerant turn tank (3B) are closed by aluminum caps (33A) and (33B), respectively.

  The top surface (3a) of each refrigerant turn tank (3A) (3B) has a central portion in the front-rear direction as the highest portion (34) and gradually lowers from the highest portion (34) toward the front and rear sides. The entire cross section is formed in an arc shape. Grooves (35) extending from the front and rear sides of the highest part (34) of the top surface (3a) to the front and rear sides (3b) are formed in the left and right sides of each refrigerant turn tank (3A) (3B). A plurality are formed at intervals.

  The first member (31) has an arcuate cross-sectional shape with the center portion in the front-rear direction protruding upward, and the hanging wall (31a) is integrally formed over the entire length on both front and rear edges. The upper surface of the first member (31) is the top surface (3a) of the refrigerant turn tank (3A) (3B), and the outer surface of the hanging wall (31a) is both front and rear sides of the refrigerant turn tank (3A) (3B). It has a surface (3b). On both front and rear sides of the first member (31), a groove (35) is formed from the highest position (34) in the center in the front-rear direction to the lower end of the hanging wall (31a). Long pipe insertion holes (36) are formed in the front-rear direction between adjacent grooves (35) in the front and rear side portions excluding the highest position (34) at the front-rear center of the first member (31). . The front and rear tube insertion holes (36) are at the same position in the left-right direction. A plurality of through holes (37) are formed at intervals in the left-right direction at the highest position (34) at the center in the front-rear direction of the first member (31). The first member (31) is formed by simultaneously forming the hanging wall (31a), the groove (35), the tube insertion hole (36), and the through hole (37) by pressing the aluminum brazing sheet. .

  The second member (32) has a substantially w-shaped cross section opened upward, and extends between the front and rear walls (38) extending in the left-right direction and curved upward toward the outer side in the front-rear direction. A vertical partition wall (39) as a partition means provided at the center and extending in the left-right direction and partitioning the refrigerant turn tank (3A) (3B) into two front and rear spaces, and both front and rear walls (38) and partitions Two connecting walls (41) for connecting the lower ends of the wall (39) together are provided. On the upper edge of the partition wall (39), a plurality of protrusions (39a) projecting upward and fitted into the through holes (37) of the first member (31) are integrally formed at intervals in the left-right direction. . The protrusion (39a) is formed by cutting a predetermined portion of the partition wall (39).

  The second member (32) is formed by integrally extruding the front and rear walls (38), the partition wall (39), and the connecting wall (41), and then cutting the partition wall (39) to form a protrusion (39a). It is manufactured by.

  Each of the caps (33A) and (33B) is formed from a bare material by pressing, forging or cutting, and the first cap is formed on the left and right inner surfaces of the left cap (33A) and the right and left caps (33B). And the recessed part in which the edge part of 2nd member (31) (32) is inserted is formed.

  Between the left refrigerant turn tank (3A) and the right refrigerant turn tank (3B), the refrigerant inflow header (7A) of the left refrigerant turn tank (3A) and the refrigerant outflow of the right refrigerant turn tank (3B) Refrigerant flow cross device (8B), and a refrigerant flow cross device (8A) for communicating the refrigerant inflow header portion (7B) of the right refrigerant turn tank (3B) and the refrigerant outflow header portion (8A) of the left refrigerant turn tank (3A) ( 42) is provided. As shown in FIGS. 6 to 8, the refrigerant flow cross device (42) includes a left refrigerant turn tank (3A) on both the left and right sides, that is, the right end and right refrigerant of the first and second members (31) and (32). A tank for turning (3B), that is, an aluminum main body block (43) having a recess (44) into which the left ends of the first and second members (31) and (32) are fitted, and both concave portions of the main body block (43) Aluminum flow direction switching plate (46A) fitted in each of the locations (44) and disposed between the end faces of the left and right refrigerant turn tanks (3A) (3B) and the bottom surfaces of both recesses (44) (46B).

  Two communication holes (45A) long in the front-rear direction so that the upper part and the lower part of the left and right recesses (44) communicate with the part between the two recesses (44) in the main body block (43) (45B) are formed at intervals in the vertical direction. Through the upper front part of the left flow direction switching plate (46A) through the refrigerant inflow header (7A) of the left refrigerant turn tank (3A) and the upper communication hole (45A) of the main body block (43) A hole (47) is formed, and the lower rear part is also passed through the refrigerant outlet header (8A) of the left refrigerant turn tank (3A) and the lower communication hole (45B) of the main body block (43). A through hole (48) is formed. Through the lower front part of the right flow direction switching plate (46B), the inside of the refrigerant inlet header (7B) of the right refrigerant turn tank (3B) and the lower communication hole (45B) of the main body block (43) are passed. A through hole (49) is formed, and the upper rear portion is also passed through the refrigerant outlet header (8B) of the right refrigerant turn tank (3B) and the upper communication hole (45A) of the main body block (43). A through hole (51) is formed. And the left refrigerant turn through the through hole (47) of the left flow direction switching plate (46A), the upper communication hole (45A) of the main body block (43) and the through hole (51) of the right flow direction switching plate (46B). The refrigerant inflow header (7A) of the tank (3A) and the refrigerant outflow header (8B) of the right refrigerant turn tank (3B) communicate with each other, and the through hole (49) of the right flow direction switching plate (46B) , Through the lower communication hole (45B) of the main body block (43) and the through hole (48) of the left flow direction switching plate (46A), the refrigerant inflow header (7B) and the left side of the right refrigerant turn tank (3B) The refrigerant turn-off header (8A) of the refrigerant turn tank (3A) is in communication.

  The main body block (43) is formed by pressing, forging or cutting from an aluminum bare material, and each flow direction switching plate (46A) (46B) is formed by pressing from an aluminum brazing sheet having a brazing filler metal layer on both sides. .

  Then, the first and second members (31) and (32) are caulked with the protrusions (39a) of the second member (32) being inserted into the through holes (37) and before and after the first member (31). In a state where the hanging wall (31a) and the front and rear walls (38) of the second member (32) are engaged with each other, they are brazed together using the brazing material layer of the first member (31), and both caps ( 33A) and 33B are brazed to the first and second members 31 and 32 using a sheet-like brazing material, and the main body block 43, the flow direction switching plates 46A and 46B, and the first And the second members (31) and (32) are brazed using the brazing material layer of the flow direction switching plates (46A) and (46B), so that the left and right refrigerant turn tanks (3A) and (3B) and the refrigerant A flow cross device (42) is formed, and the refrigerant inflow header portion (7A) (7B) is located in front of the partition wall (39) of the second member (32) of each refrigerant turn tank (3A) (3B). Similarly, the refrigerant outflow header portions (8A) and (8B) are located behind the partition wall (39).

  The heat exchange pipe (9) constituting the front and rear heat exchange pipe group (11) is made of a bare material formed of an aluminum extruded profile, and has a wide flat shape in the front and rear direction, and a plurality of parts extending in the length direction therein. The refrigerant passages (9a) are formed in parallel. The front and rear end walls of the heat exchange tube (9) have an arc shape protruding outward. The heat exchange pipe (9) of the front heat exchange pipe group (11) and the heat exchange pipe (9) of the rear heat exchange pipe group (11) are arranged to be at the same position in the left-right direction. The upper end of the heat exchange pipe (9) is inserted into the pipe insertion hole (19) of the first member (14) of the refrigerant inlet / outlet tank (2), and the upper end protrudes into the refrigerant inlet / outlet tank (2). In this state, the brazing material layer of the first member (14) is used to braze the first member (14). The lower end of the heat exchange pipe (9) is inserted into the pipe insertion hole (36) of the first member (31) of the refrigerant turn tank (3A) (3B), and the lower end thereof is the refrigerant turn tank (3A) (3B ) And brazed to the first member (31) using the brazing material layer of the first member (31). That is, the heat exchange pipe (9) located in the left half part of the front heat exchange pipe group (11) is the left part of the refrigerant inlet header part (5) and the refrigerant inflow header part (7A of the left refrigerant turn tank (3A)). ) And the heat exchange pipe (9) located in the right half is connected to the right side portion of the refrigerant inlet header portion (5) and the refrigerant inflow header portion (7B) of the right refrigerant turn tank (3B). ing. In addition, the heat exchange pipe (9) located in the left half of the rear heat exchange pipe group (11) includes a left part of the refrigerant outlet header part (6) and a refrigerant outflow header part of the left refrigerant turn tank (3A) ( 8A) and the heat exchange pipe (9) located in the right half is connected to the right part of the refrigerant outlet header (6) and the refrigerant outlet header (8B) of the right refrigerant turn tank (3B) Has been.

  The tube height which is the thickness in the left-right direction of the heat exchange tube (9) is 0.75 to 1.5 mm, the tube width which is the width in the front-rear direction is 12 to 18 mm, and the wall thickness of the peripheral wall is 0.17 to 0.28 mm. The thickness of the partition wall partitioning the refrigerant passages (9a) is 0.17 to 0.28 mm, the pitch of the partition wall is 0.5 to 3.0 mm, and the curvature radius of the outer surfaces of the front and rear end walls is 0.35 to 0 .75 mm is preferable.

  As the heat exchange pipe (9), instead of the one made of an aluminum extruded shape, one in which a plurality of refrigerant passages are formed by inserting inner fins into an aluminum electric sewing pipe may be used. . Also, two flat wall forming parts formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides and connected via connecting parts, and the opposite side of the connecting part in each flat wall forming part A side wall forming portion integrally formed in a protruding shape from the side edges of the flat wall forming portion, and a plurality of partition wall forming portions integrally formed in a protruding shape from the two flat wall forming portions at a predetermined interval in the width direction of the flat wall forming portion. It is also possible to use a plate having a partition wall formed by bending a plate with a hairpin shape at the connecting portion, butting the side wall forming portions with each other and brazing each other.

  The corrugated fin (12) is formed in a corrugated shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plurality of the corrugated fins (12) connected in parallel in the front-rear direction to the connecting portion connecting the wave head and the wave bottom. A louver is formed. The corrugated fin (12) is shared by both the front and rear heat exchange tube group (11), and the width in the front and rear direction is the front side edge and the rear side heat exchange of the heat exchange tube (9) of the front side heat exchange tube group (11). The intervals between the rear edge of the heat exchange tube (9) of the tube group (11) are substantially equal. Here, the linear distance between the wave head and the wave bottom, which is the fin height of the corrugated fin (12), is 7 mm to 10 mm, and the pitch of the connecting portion, which is also the fin pitch, is 1.3 to 1.8 mm. preferable.

  The evaporator (1) is manufactured by temporarily fastening a combination of the constituent members and brazing all the constituent members together. In addition, instead of one corrugated fin (12) being shared by both the front and rear heat exchange tube groups (11), each corrugated fin is disposed between adjacent heat exchange tubes (9) of both heat exchange tube groups (11). May be arranged.

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

  In the evaporator (1) described above, as shown in FIG. 9, the gas-liquid mixed phase two-layer refrigerant that has passed through the compressor, the condenser, and the decompression means is supplied to the refrigerant inlet / outlet (29a) and the right cap of the refrigerant inlet / outlet member (29). Enters the refrigerant inlet header (5) of the refrigerant inlet / outlet tank (2) through the refrigerant inlet (17a) of (17) and divides all the heat exchange pipes (9 ) Into the refrigerant passage (9a).

  The refrigerant that has flowed into the refrigerant passage (9a) of the heat exchange pipe (9) located in the left half of the front heat exchange pipe group (11) flows downward in the refrigerant passage (9a) and flows into the left refrigerant turn tank. (3A) enters the refrigerant inflow header portion (7A), and the upper flow through the through hole (47) in the upper front portion of the left flow direction switching plate (46A) of the refrigerant flow cross device (42) and the upper communication of the main body block (43) The refrigerant flows into the refrigerant outflow header portion (8B) of the right refrigerant turn tank (3B) through the hole (45A) and the through hole (51) in the upper rear portion of the right flow direction switching plate (46B). On the other hand, the refrigerant that has flowed into the refrigerant passage (9a) of the heat exchange pipe (9) located in the right half of the front heat exchange pipe group (11) flows downward in the refrigerant passage (9a) and flows into the right refrigerant turn. Through the refrigerant inflow header (7B) of the tank (3B), the through hole (49) in the lower front part of the right flow direction switching plate (46B) of the refrigerant flow cross device (42), the main body block (43) Flows into the refrigerant outlet header (8A) of the left refrigerant turn tank (3A) through the lower communication hole (45B) and the through hole (48) in the lower rear part of the left flow direction switching plate (46A). To do. At this time, the liquid phase refrigerant and the gas phase refrigerant are mixed.

  The refrigerant that has entered the refrigerant outflow headers (8A) and (8B) of the respective refrigerant turn tanks (3A) and (3B) is diverted and the refrigerant outflow headers (8A) of the rear heat exchange pipe group (11). The refrigerant flows into the refrigerant passage (9a) of the heat exchange pipe (9) connected to (8B), changes the flow direction, flows upward in the refrigerant passage (9a), and then flows out of the refrigerant inlet / outlet tank (2). It enters the lower space (6b) of the header part (6).

  Next, the refrigerant enters the upper space (6a) of the refrigerant outlet header (6) through the refrigerant passage holes (28A) (28B) of the shunt resistor plate (27), and enters the refrigerant outlet (17b) of the cap (17). ) And the refrigerant outlet / outlet (29b) of the refrigerant inlet / outlet member (29). The refrigerant passes through the refrigerant passage (9a) of the heat exchange pipe (9) of the front heat exchange pipe group (11) and the refrigerant passage (9a) of the heat exchange pipe (9) of the rear heat exchange pipe group (11). During the flow, the ventilation gap exchanges heat with the air flowing in the direction indicated by the arrow X in FIG.

At this time, condensed water is generated on the surface of the corrugated fin (12), and this condensed water flows down to the top surface (3a) of the refrigerant turn tank (3A) (3B). The condensed water that has flowed down to the top surface (3a) of the refrigerant turn tank (3A) (3B) enters the groove (35) by the capillary effect, flows in the groove (35), and flows from the outer end in the front-rear direction. Drops below the turn tank (3A) (3B). In this way, freezing of the condensed water caused by the accumulation of a large amount of condensed water between the top surface (3a) of the refrigerant turn tank (3A) (3B) and the lower end of the corrugated fin (12) is prevented. The performance degradation of the evaporator (1) is prevented.
When the refrigerant flows as described above, the length of the flow path of the refrigerant passing through the evaporator (1) is made equal to that of the evaporator described in Patent Document 1, and the pressure distribution is made uniform so that all heat exchange is performed. The refrigerant circulation amount in the pipe (9) is made uniform. Therefore, the temperature of the air passing through the heat exchange core part (4) is also made uniform as a whole. Further, the refrigerant circulation amount of the plurality of heat exchange pipes (9) connected to the refrigerant inflow header portion (7A) of the left refrigerant turn tank (3A) is reduced, and the refrigerant inflow of the right refrigerant turn tank (3B) is reduced. When the refrigerant circulation amount of the plurality of heat exchange pipes (9) connected to the header section (7B) is large, the plurality of heat exchange pipes connected to the refrigerant outflow header section (8A) of the left refrigerant turn tank (3A) As the refrigerant flow rate of (9) increases, the refrigerant flow rate of the plurality of heat exchange tubes (9) connected to the refrigerant outflow header portion (8B) of the right refrigerant turn tank (3B) decreases, Conversely, the refrigerant circulation amount of the plurality of heat exchange pipes (9) connected to the refrigerant inflow header portion (7A) of the left refrigerant turn tank (3A) increases, and the right refrigerant turn tank (3B) When the refrigerant circulation amount of the plurality of heat exchange pipes (9) connected to the refrigerant inflow header (7B) is small, the refrigerant flow in the left refrigerant turn tank (3A) The refrigerant circulation amount of the plurality of heat exchange pipes (9) connected to the outlet header section (8A) decreases, and the plurality of heat connected to the refrigerant outlet header section (8B) of the right refrigerant turn tank (3B). The refrigerant circulation amount in the exchange pipe (9) increases. Therefore, the amount of refrigerant contributing to heat exchange is made uniform in the left-right direction of the heat exchange core part (4), and as a result, the temperature of the air passing through the heat exchange core part (4) is also made uniform overall. The

  Further, during the flow of the refrigerant described above, resistance is imparted to the flow of the refrigerant by the shunt resistance plate (27), so that the rear heat exchange pipe group (11 ) To the heat exchange pipe (9), and the flow from the refrigerant inlet header (5) to all the heat exchange pipes (9) in the front heat exchange pipe group (11) is made more uniform. Is done. As a result, the refrigerant circulation amount of all the heat exchange tubes (9) in both heat exchange tube groups (11) is made uniform.

  In the above embodiment, between the refrigerant inlet header (5) and the refrigerant inlet headers (7A) (7B) of the left and right refrigerant turn tanks (3A) (3B), and the refrigerant outlet header (6) One heat exchange tube group (11) is provided between each of the left and right refrigerant turn tanks (3A) (3B) and the refrigerant outflow headers (8A) (8B), but this is not restrictive. , Between the refrigerant inlet header (5) and the refrigerant inflow headers (7A) (7B) of the left and right refrigerant turn tanks (3A) (3B), and for the refrigerant outlet header (6) and the left and right refrigerant turns One or two or more heat exchange pipe groups (11) may be provided between the refrigerant outflow header portion (8) of the tank (3A) (3B). In the above embodiment, the refrigerant inlet / outlet tank (2) is on the upper side and the refrigerant turn side tanks (3A) and (3B) are on the lower side. In some cases, the refrigerant turn side tanks (3A) and (3B) are used so that they are on the upper side.

  Furthermore, in the said embodiment, although the case where the heat exchanger by this invention was applied to the evaporator of a refrigerating cycle was demonstrated, the heat exchanger by this invention is applicable also to another kind of heat exchanger.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which the present invention is applied. It is the vertical sectional view seen from the back which omitted a part similarly. It is a disassembled perspective view of the tank for a refrigerant | coolant in / out. It is a disassembled perspective view of two tanks for refrigerant | coolant turns. It is the VV line expanded sectional view of FIG. It is a partially cutaway exploded perspective view showing an enlarged portion of the refrigerant flow cloth device. It is the VII-VII line expanded sectional view of FIG. It is the VIII-VIII line expanded sectional view of FIG. It is a figure which shows how the refrigerant | coolant flows in the evaporator shown in FIG.

Explanation of symbols

(1): Evaporator (heat exchanger)
(2): Refrigerant tank
(3A) (3B): Refrigerant turn tank
(4): Heat exchange core
(5): Refrigerant inlet header
(6): Refrigerant outlet header
(7A) (7B): Refrigerant inflow header
(8A) (8B): Refrigerant outflow header
(9): Heat exchange pipe
(11): Heat exchange tube group
(14): First member
(15): Second member
(24): Partition wall (partitioning means)
(27): Shunt resistor plate (compartment means)
(28A) (28B): Refrigerant passage hole
(31): First member
(32): Second member
(39): Partition wall (partitioning means)
(42): Refrigerant flow cloth device
(43): Body block
(44): Recess
(45A) (45B): Communication hole
(46A) (46B): Flow direction switching plate
(47) (48) (49) (51): Through hole

Claims (18)

A heat exchange core group configured by arranging a plurality of rows of heat exchange tubes arranged in a row along a ventilation direction, and arranged on one end side of the heat exchange tube, with a plurality of heat exchange tubes arranged at intervals, And the refrigerant | coolant inlet header part to which the heat exchange pipe | tube of the at least 1 row heat exchange pipe group was connected, and it arrange | positioned in the rear side of a refrigerant | coolant inlet header part in the one end side of a heat exchange pipe, The refrigerant outlet header portion to which the heat exchange pipe is connected, and two refrigerants connected to the other end side of the heat exchange pipe in the left-right direction and connected to the heat exchange pipe connected to the refrigerant inlet header portion An inflow header portion and a heat exchange tube of a heat exchange tube group arranged side by side in the left-right direction behind the two refrigerant inflow header portions on the other end side of the heat exchange tube and connected to the refrigerant outlet header portion Two connected refrigerant outflow headers, Inflow header and the right of the refrigerant outflow header section side, and right inflow header and the heat exchanger and the refrigerant outflow header section of the left side are communicated with each. The heat exchanger according to claim 1, wherein a refrigerant inlet is formed at one end of the refrigerant inlet header portion, and a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header portion. The heat exchanger according to claim 1 or 2, wherein the left refrigerant inflow header portion and the refrigerant outflow header portion, and the right refrigerant inflow header portion and the refrigerant outflow header portion are provided in one tank, respectively. A refrigerant flow cross that connects the refrigerant inflow header portion of the left tank and the refrigerant outflow header portion of the right tank, and the refrigerant inflow header portion of the right tank and the refrigerant outflow header portion of the left tank, respectively, between the left tank and the right tank. 4. A heat exchanger according to claim 3, wherein a device is provided. The refrigerant flow cross device includes a main body block having recesses into which the right end of the left tank and the left end of the right tank are fitted on the left and right sides, and both end faces of the left and right tanks. A flow direction switching plate disposed between the bottom surface of the recess, and the body block has two communication holes long in the front-rear direction that allow the upper and lower portions of the left and right recesses to communicate with each other. A left and right refrigerant inflow header portion and a right tank refrigerant outflow header portion, and a left tank refrigerant outflow header portion and a right tank refrigerant inflow header portion are formed on the two flow direction switching plates. The heat exchanger according to claim 4, wherein through holes are formed so as to communicate with each other. A through hole that allows the left flow direction switching plate to pass through the refrigerant inflow header portion of the left tank and one communication hole of the main body block, and a through hole that allows the refrigerant outflow header portion of the left tank and the other communication hole of the main body block to pass through. The right flow direction switching plate has a through hole passing through the refrigerant inflow header portion of the right tank and the other communication hole of the main body block, and the one communication port of the refrigerant outflow header portion of the right tank and the main body block. The heat exchanger according to claim 5, wherein a through hole is formed through the hole. The left and right tanks each comprise a first member to which a heat exchange pipe is connected and a second member brazed to a portion of the first member opposite to the heat exchange pipe. A heat exchanger according to any of the above. The heat exchanger according to claim 7, wherein the first member is made of an aluminum brazing sheet having a brazing filler metal layer on at least one side. The heat exchanger according to claim 7 or 8, wherein the second member is made of an aluminum extruded profile. The heat exchanger according to any one of claims 5 to 9, wherein the main body block is made of an aluminum bare material, and the flow direction switching plate is made of an aluminum brazing sheet having brazing material layers on both sides. The refrigerant outlet header is partitioned into two spaces in the height direction by the partitioning means, and a heat exchange pipe is connected so as to face the first space, a refrigerant passage hole is formed in the partitioning means, and the refrigerant outlet header part The heat exchanger according to any one of claims 1 to 10, wherein the refrigerant flows out of the second space. The heat exchanger according to claim 11, wherein the refrigerant inlet header portion and the refrigerant outlet header portion are provided in one refrigerant inlet / outlet tank. The refrigerant inlet / outlet tank includes a first member to which the heat exchange pipe is connected and a second member brazed to a portion of the first member opposite to the heat exchange pipe, and the partition means serves as the second member. The heat exchanger according to claim 12, which is integrally formed. The heat exchanger according to claim 13, wherein the first member is made of an aluminum brazing sheet having a brazing filler metal layer on at least one side. The heat exchanger according to claim 13 or 14, wherein the second member is made of an aluminum extruded profile. The heat exchanger according to any one of claims 1 to 15, wherein each heat exchange tube group of the heat exchange core portion includes seven or more heat exchange tubes. A refrigeration cycle comprising a compressor, a condenser, and an evaporator, wherein the evaporator is a heat exchanger according to any one of claims 1 to 16. A vehicle in which the refrigeration cycle according to claim 17 is mounted as an air conditioner.

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