JP4734021B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and more particularly 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 and claims, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIGS. 1 and 11) is the front side, and the opposite side is the front side. It will be later.

  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 including a plurality of heat exchange tubes arranged at intervals in the front-rear 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 by a partition wall into a refrigerant inlet header portion located on the front side and a refrigerant outlet header portion located on the rear side, a refrigerant inlet is formed at one end of the refrigerant inlet header portion, and in the refrigerant outlet header portion A refrigerant outlet is formed at the same end as the refrigerant inlet, and the refrigerant turn tank is partitioned by a partition wall into a refrigerant inflow header portion located on the front side and a refrigerant outflow header portion located on the rear side. A plurality of refrigerant passage holes are formed in the cut wall at intervals in the length direction, the upper end of the heat exchange pipe of the front heat exchange pipe group is at the refrigerant inlet header, and the heat exchange of the rear heat exchange pipe group The upper end of each pipe is connected to the refrigerant outlet header, the lower end of the heat exchange pipe in the front heat exchange pipe group is the refrigerant inflow header part, and the lower end of the heat exchange pipe in the rear heat exchange pipe group is the refrigerant. Refrigerant that is connected to the outflow header part and flows into the refrigerant inlet header part of the refrigerant inlet / outlet tank flows into the refrigerant inflow header part of the refrigerant turn tank through the heat exchange pipe of the front heat exchange pipe group, An evaporator that flows into the refrigerant outflow header through the refrigerant passage hole of the partition wall, and further 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).

  However, as a result of various studies by the inventor, it has been found that it is difficult to further improve the performance of the evaporator described in Patent Document 1 for the following reason.

That is, in the evaporator described in Patent Document 1, the refrigerant that has flowed into the refrigerant inlet header may not be evenly divided into all the heat exchange tubes connected to the refrigerant inlet header, and as a result, the heat exchange core Since there is a bias in the refrigerant distribution in the front heat exchange tube group, there is also a bias in the distribution of the temperature (refrigerant dryness) of the refrigerant flowing through the heat exchange tubes in the front heat exchange tube group. Then, the refrigerant having a non-uniform temperature distribution flows into the heat exchange pipe of the rear heat exchange pipe group as it is through the refrigerant inflow header section and the refrigerant outflow header section. The bias is inherited as it is to the rear heat exchange tube group, and becomes more prominent. Therefore, the temperature of the air that has passed through the heat exchange core portion also becomes uneven depending on the location, and the effect of improving the heat exchange performance of the evaporator may not be sufficiently obtained. Such a problem occurs particularly prominently when the flow rate of the refrigerant changes or when the wind speed of the air passing through the heat exchange core portion varies from place to place.
Japanese Patent Laid-Open No. 2003-75024

  An object of the present invention is to solve the above problems and provide a heat exchanger having excellent heat exchange performance.

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

1) A refrigerant inlet header having a refrigerant inlet, a refrigerant outlet header located on the rear side of the refrigerant inlet header and having a refrigerant outlet, and a refrigerant circulation path through the refrigerant inlet header and the refrigerant outlet header. and which, refrigerant circulation path, and at least two intermediate header section, the refrigerant inlet header section, Ri Na more and more heat exchange tubes establishing communication with the outlet header and all the intermediate header section, refrigerant inflow side refrigerant flows A heat exchanger in which an intermediate header portion and a refrigerant outflow side intermediate header portion from which the refrigerant flows out are provided side by side, and the refrigerant inflow side intermediate header portion and the refrigerant outflow side intermediate header portion are communicated at one end. In
In the refrigerant outflow side intermediate header part, first diversion control means for equalizing the refrigerant diversion to the heat exchange pipe connected to the refrigerant outflow side intermediate header part is provided, and the first diversion control means is The first flow control wall has a plurality of refrigerant passage holes and divides the refrigerant outflow side intermediate header portion into two spaces in the height direction, and includes a refrigerant inflow side intermediate header portion and a refrigerant outflow side intermediate header portion. 1 space is communicated at one end, a heat exchange pipe connected to the refrigerant outflow side intermediate header portion faces the second space, and a plurality of refrigerant passage holes are formed in the first diversion control wall. The intervals between adjacent refrigerant passage holes are gradually increased as they move away from the end on the side where the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part communicate with each other. heat exchanger it is.

2) A heat exchange core group configured by arranging a plurality of heat exchange tube groups, each of which is composed of a plurality of heat exchange tubes arranged at intervals, arranged in the front-rear direction, and disposed on one end side of the heat exchange tube And a refrigerant inlet header portion to which heat exchange pipes of at least one row of heat exchange pipe groups are connected, and one end side of the heat exchange pipes arranged behind the refrigerant inlet header section, and the remaining heat exchange pipe groups A refrigerant outlet header part to which the heat exchange pipe is connected, a refrigerant inflow side intermediate header part to which the heat exchange pipe connected to the refrigerant inlet header part is arranged on the other end side of the heat exchange pipe, and A refrigerant outflow side intermediate header portion disposed on the rear side of the refrigerant inflow side intermediate header portion on the other end side of the heat exchange tube and connected to a heat exchange tube of a heat exchange tube group connected to the refrigerant outlet header portion; The heat exchanger according to 1) above, comprising:

3) The heat exchanger according to 1) or 2) , wherein the refrigerant passage hole is formed on the rear side of the center portion in the front-rear direction of the first branch flow control wall.

4) Any one of the above 1) to 3) in which the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part are provided by dividing the inside of one refrigerant turn tank forward and backward by partition means The heat exchanger as described in.

5) The heat exchanger according to 4) above, wherein a communication member for communicating the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part is provided at one end of the refrigerant turn tank.

6) The refrigerant turn tank includes a first member connected to the heat exchange pipe, a second member brazed to a portion of the first member opposite to the heat exchange pipe, and the first and second members. A first shunt comprising a closing member brazed to both ends, the second member having partition means and a plurality of refrigerant passage holes, and dividing the inside of the refrigerant outflow side intermediate header into two spaces in the height direction; The heat exchanger according to 4) or 5) above, wherein the control wall is integrally formed.

7) A through hole is formed in any one of the closing members to allow the refrigerant inflow side intermediate header portion and the first space communicating with the refrigerant inflow side intermediate header portion in the refrigerant outflow side intermediate header portion to communicate with each other. The heat exchanger according to 6) above, wherein a communication member for communicating the two through holes is brazed to the outer surface of the closing member.

8) The closing member having a through hole is plate-shaped, and the communicating member is a plate having the same shape and size as the closing member when viewed from the side, and the communicating member has both through holes of the closing member inside. The heat exchanger as described in 7) above, wherein an outward bulging portion serving as a communication path for communication is formed.

9) A main body portion in which the outline of the closing member having the through hole is the same as the cross-sectional shape of the outer shape of the refrigerant turn tank, and a protrusion protruding from the main body portion toward the refrigerant inlet header portion and the refrigerant outlet header portion. The heat exchanger according to 8) above, wherein the outward bulging portion of the communication member is formed to correspond to the main body portion and the protruding portion of the closing member.

10) The heat exchanger according to any one of 6) to 9) , wherein the first member is made of an aluminum brazing sheet having a brazing material layer on at least one side.

11) The heat exchanger according to any one of 6) to 10) , wherein the second member is made of an aluminum extruded profile.

12) The heat exchanger according to any one of 7) to 11) above, wherein the closing member having a through hole is made of an aluminum brazing sheet having brazing material layers on both sides.

13) Any one of the above 1) to 12) , wherein the refrigerant inlet header portion is provided with second diversion control means for equalizing the refrigerant diversion to the heat exchange pipe connected to the refrigerant inlet header portion. The heat exchanger as described in.

14) The second diversion control means includes a second diversion control wall having a plurality of refrigerant passage holes and dividing the refrigerant inlet header portion into two spaces in the height direction, and the refrigerant inlet is the first space. The heat exchanger as described in 13) above, wherein the heat exchange pipe connected to the refrigerant inlet header portion faces the second space.

15) A plurality of refrigerant passage holes are formed in the second diversion control wall at intervals in the length direction, and the refrigerant passage holes are smaller than the refrigerant passage holes of the first diversion control means. 14) The heat exchanger described.

16) Any one of the above 13) to 15) , wherein the refrigerant outlet header is provided with a third diversion control means for equalizing the refrigerant diversion to the heat exchange pipe connected to the refrigerant outlet header. The heat exchanger as described in.

17) The third diversion control means includes a third diversion control wall having a refrigerant passage hole and dividing the inside of the refrigerant outlet header portion into two spaces in the height direction, and the refrigerant outlet communicates with the first space. The heat exchanger according to 16) above, wherein the heat exchange pipe connected to the refrigerant outlet header portion faces the second space.

18) The heat according to any one of 14) to 17) , wherein the refrigerant inlet header portion and the refrigerant outlet header portion are provided by dividing one refrigerant inlet / outlet tank forward and backward by a partitioning means. Exchanger.

19) The refrigerant inlet / outlet tank includes a first member connected to the heat exchange pipe, a second member brazed to a portion of the first member opposite to the heat exchange pipe, and the first and second members. A second shunting control wall comprising a closing member brazed to both ends, the second member having partition means, a plurality of refrigerant passage holes, and dividing the inside of the refrigerant inlet header into two spaces in the height direction The heat exchanger as described in 18) above, wherein a third branch flow control wall having a refrigerant passage hole and dividing the refrigerant outlet header portion into two spaces in the height direction is integrally formed.

20) The heat exchanger according to 19) above, wherein the first member comprises an aluminum brazing sheet having a brazing filler metal layer on at least one side.

21) The heat exchanger according to 19) or 20) above, wherein the second member is made of an aluminum extruded profile.

22) The above-mentioned 1) to 1 ), wherein the heat exchange tube is flat and is arranged with its width direction facing the front-rear direction, and the tube height, which is the thickness of the heat exchange tube, is 0.75 to 1.5 mm The heat exchanger according to any one of 21) .

23) Fins are arranged between adjacent heat exchange pipes, and the fins are corrugated, comprising a wave top part, a wave bottom part, and a flat connection part connecting the wave top part and the wave bottom part. Any one of the above 1) to 22) , wherein the linear distance between a wave crest and a wave bottom is 7.0 mm to 10.0 mm, and the pitch of the connecting portion, which is also a fin pitch, is 1.3 to 1.7 mm. The described heat exchanger.

24) The corrugated fin has a wave crest and a wave bottom composed of a flat portion and a rounded portion provided on both sides of the flat portion and connected to the connecting portion, and the radius of curvature of the rounded portion is 0.7 mm or less. 23) The heat exchanger described.

25) A refrigeration cycle comprising a compressor, a condenser, and an evaporator, wherein the evaporator comprises the heat exchanger according to any one of 1) to 24) above.

26) A vehicle equipped with the refrigeration cycle described in 25 ) above as a car air conditioner.

  According to the heat exchangers of 1) and 2) above, the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part are communicated at one end, so that the refrigerant inlet header part passes through the heat exchange pipe. The refrigerant that has flowed into the refrigerant inflow side intermediate header portion turns so as to change the flow direction at the one end portion, and flows into the refrigerant outflow side intermediate header portion. As a result, the refrigerant that has flowed into the refrigerant inlet header portion is not evenly distributed to all the heat exchange pipes connected to the refrigerant inlet header portion, thereby connecting to the refrigerant inlet header portion and the refrigerant inflow side intermediate header portion. Even if the distribution of the temperature (refrigerant dryness) of the refrigerant flowing through all the heat exchange pipes in the heat exchange pipe group is uneven, the refrigerant inflow side intermediate header part is turned to the refrigerant outflow side intermediate header part. When the refrigerant flows in, all the refrigerants are mixed, and the temperature is uniform throughout, and all the heat exchange pipes of the heat exchange pipe group connected to the refrigerant outflow side intermediate header section and the refrigerant outlet header section. The temperature of the refrigerant flowing through is made uniform.

According to the heat exchanger of 1) , the refrigerant flow-out side intermediate header portion is provided with the first flow division control means for equalizing the flow of the refrigerant to the heat exchange pipe connected to the refrigerant flow-out side intermediate header portion. Therefore, the amount of refrigerant flowing through all the heat exchange tubes of the heat exchange tube group connected to the refrigerant outflow side intermediate header portion and the refrigerant outlet header portion is also made uniform. Therefore, the temperature of the air that has passed through the heat exchange core is also made uniform, and the heat exchange performance of the heat exchanger is improved. Moreover, even when the flow rate of the refrigerant changes or when the wind speed of the air passing through the heat exchange core portion varies depending on the location, the temperature of the air passing through the heat exchange core portion is made uniform.

According to the heat exchangers 1) and 3) described above, the first diversion control means can be provided in the refrigerant outflow side intermediate header portion relatively easily.

According to the heat exchanger of the above 4), the number of parts of the entire heat exchanger can be reduced.

According to the heat exchanger of 5) above, the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part can be communicated relatively easily.

According to the heat exchanger of the above 6) , the first shunt control has a partition means for the refrigerant turn tank and a plurality of refrigerant passage holes, and divides the inside of the refrigerant outflow side intermediate header into two spaces in the height direction. Since the wall is formed integrally with the second member, the partition means and the flow dividing control wall can be easily provided in the refrigerant turn tank.

According to the heat exchangers of 7) and 8) above, the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part can be communicated relatively easily at one end.

According to the heat exchanger of 9) above, the passage area of the communication passage in the outward bulging portion of the communication member can be increased in a limited space.

According to the heat exchanger of 10) above, using the brazing material layer on at least one side of the first member and brazing the first member and the second member, the first member and the heat exchange tube are connected simultaneously. Since the heat exchange pipe can be connected to the refrigerant turn tank by brazing, the manufacturing operation is simplified.

According to the heat exchanger of the above 11) , the second member of the refrigerant turn tank can be manufactured relatively easily.

According to the heat exchanger of the above 12) , the closing member can be brazed to the first and second members using brazing material layers on both sides of the closing member, and the communication member is brazed to the closing member. Manufacturing process is simplified.

According to the heat exchanger of the above 13) , the second diversion control means for equalizing the diversion of the refrigerant to the heat exchange pipe connected to the refrigerant inlet header is provided in the refrigerant inlet header. The flow of the refrigerant that has flowed into the refrigerant inlet header portion is uniformly distributed to all the heat exchange tubes of the heat exchange pipe group connected to the refrigerant inlet header portion, and is connected to the refrigerant inlet header portion and the refrigerant inflow side intermediate header portion. It is possible to suppress the occurrence of bias in the temperature distribution of the refrigerant flowing through all the heat exchange tubes of the heat exchange tube group.

According to the heat exchangers 14) and 15) , the second diversion control means can be provided in the refrigerant inlet header portion relatively easily.

According to the heat exchanger of the above 16) , the third branch flow control means for equalizing the flow of the refrigerant to the heat exchange pipe connected to the refrigerant outlet header is provided in the refrigerant outlet header. The refrigerant flow from the refrigerant outflow side intermediate header part to the refrigerant outlet header part and all the heat exchange pipes of the heat exchange pipe group connected to the refrigerant outflow side intermediate header part is made uniform, and the refrigerant inlet header part to the refrigerant The flow of the refrigerant to all the heat exchange tubes of the heat exchange tube group connected to the inlet header portion and the refrigerant inflow side intermediate header portion is further uniformized.

According to the heat exchanger of the above 17) , the third diversion control means can be provided in the refrigerant outlet header portion relatively easily.

According to the heat exchanger of the above 18), the number of parts of the whole heat exchanger can be reduced.

According to the heat exchanger of the above 19) , the partitioning means for the refrigerant inlet / outlet tank, the second shunt control wall having a plurality of refrigerant passage holes and dividing the inside of the refrigerant inlet header portion into two spaces in the height direction; Since the third diversion control wall having the refrigerant passage hole and dividing the inside of the refrigerant outlet header portion into two spaces in the height direction is formed integrally with the second member, partition means and Both shunt flow control walls can be easily provided.

According to the heat exchanger of the above 20) , the first member and the heat exchange pipe are simultaneously bonded to the first member and the second member by using the brazing material layer on at least one side of the first member. Since the heat exchange pipe can be connected to the refrigerant inlet / outlet tank by brazing, the manufacturing operation is simplified.

According to the heat exchanger of 21) , the second member of the refrigerant inlet / outlet tank can be manufactured relatively easily.

According to the heat exchanger of the above 22) , it is possible to improve the heat exchange performance while suppressing an increase in ventilation resistance and to improve the balance between the two.

According to the heat exchanger of the above 23) , it is possible to improve the heat exchange performance while suppressing an increase in ventilation resistance and to improve the balance between the two.

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

  In the following description, the top and bottom and the left and right in FIGS. 1 and 2 are referred to as the top and bottom and the left and right, respectively.

  1 and 2 show the overall configuration of an evaporator to which the heat exchanger according to the present invention is applied, FIGS. 3 to 10 show the configuration of the main part, and FIG. 11 shows how the refrigerant flows in the evaporator.

  In FIG. 1 and FIG. 2, the evaporator (1) includes an aluminum refrigerant inlet / outlet tank (2) and an aluminum refrigerant turn tank (3) arranged at intervals in the vertical direction, and both tanks (2) ( And 3) a heat exchange core portion (4) provided between them.

  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). . The refrigerant inlet pipe (7) is connected to the refrigerant inlet header (5) of the refrigerant inlet / outlet tank (2), and the aluminum refrigerant outlet pipe (8) is connected to the refrigerant outlet header (6). . The refrigerant turn tank (3) includes a refrigerant inflow header portion (9) (refrigerant inflow side intermediate header portion) located on the front side and a refrigerant outflow header portion (11) (refrigerant outflow side intermediate header portion) located on the rear side. It has.

  The heat exchange core section (4) includes a plurality of rows of heat exchange pipe groups (13) composed of a plurality of aluminum heat exchange pipes (12) arranged in parallel at intervals in the left-right direction. Here, two rows are arranged. The ventilation gap between adjacent heat exchange pipes (12) of each heat exchange pipe group (13) and the outside of the heat exchange pipes (12) at the left and right ends of each heat exchange pipe group (13) are made of aluminum. Corrugated fins (14) are arranged and brazed to the heat exchange tubes (12). Aluminum side plates (15) are respectively arranged outside the corrugated fins (14) at the left and right ends and brazed to the corrugated fins (14). The upper and lower ends of the heat exchange pipe (12) of the front heat exchange pipe group (13) are connected to the refrigerant inlet header part (5) and the refrigerant inflow header part (9), and the rear heat exchange pipe group (13) The upper and lower ends of the heat exchange pipe (12) are connected to the refrigerant outlet header (6) and the refrigerant outflow header (11).

  As shown in FIGS. 3 to 6, the refrigerant inlet / outlet tank (2) is a plate-shaped first member formed of an aluminum brazing sheet having a brazing filler metal layer on both sides and connected to a heat exchange pipe (12). 16), a second member (17) made of a bare material formed of an extruded aluminum material and covering the upper side of the first member (16), and an aluminum cap (18) (19) that closes both the left and right openings. A joint plate (21) made of an aluminum bare material that is long in the front-rear direction so as to straddle the refrigerant inlet header (5) and the refrigerant outlet header (6) on the outer surface of the right cap (19). ) Are brazed, and the refrigerant inlet pipe (7) and the refrigerant outlet pipe (8) are connected to the joint plate (21).

  The first member (16) has curved portions (22) having a small cross-sectional arc shape with a central portion projecting downward at both front and rear side portions thereof. A plurality of tube insertion holes (23) that are long in the front-rear direction are formed in each bending portion (22) at intervals in the left-right direction. The tube insertion holes (23) of the front and rear curved portions (22) are at the same position in the left-right direction. Standing walls (22a) are integrally formed over the entire length at the front edge of the front curved portion (22) and the rear edge of the rear curved portion (22), respectively. In addition, a plurality of through holes (25) are formed at intervals in the left-right direction in the flat portion (24) between the curved portions (22) of the first member (16).

  The second member (17) has a substantially m-shaped cross section that opens downward, and is provided in the center between the front and rear walls (26) extending in the left-right direction and the front and rear walls (26) and extends in the left-right direction. A partition wall (27) 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 (26) and the partition wall (27) are integrally connected to each other. Two projecting cross-section substantially arc-shaped connecting walls (28) are provided.

  The front wall (26) of the second member (17) and the lower end portions of the partition wall (27) are integrally connected over the entire length by the diversion control wall (10) (second diversion control wall) in the inlet header. . Further, at the same height position as the inlet header diversion control wall (10), the rear wall (26) of the second member (17) and the lower ends of the partition wall (27) are connected to the inner diversion control wall (29) of the outlet header. ) (Third shunt control wall). A plurality of circular coolant passage holes (20) are formed in a penetrating manner at intervals in the left-right direction at the center portion in the front-rear direction of the branch flow control wall (10) in the inlet header section. The intervals between adjacent circular coolant passage holes (20) are all equal. All the circular refrigerant passage holes (20) are located between the adjacent heat exchange tubes (12). A plurality of oblong coolant passage holes (31A) and (31B) that are long in the left-right direction pass through at intervals in the left-right direction in the portion excluding the left and right ends of the rear portion of the outlet flow control wall (29) in the outlet header section. It is formed in a shape. The length of the oval refrigerant through hole (31A) in the center is shorter than the length of the other oval refrigerant through hole (31B) and is located between the adjacent heat exchange tubes (12). The lower end of the partition wall (27) protrudes downward from the lower ends of the front and rear walls (26), and a plurality of lower walls protrude downward and are fitted into the through holes (25) of the first member (16). The protrusions (27a) are integrally formed with an interval in the left-right direction. The protrusion (27a) is formed by cutting a predetermined portion of the partition wall (27). Here, the flow control wall (10) in the inlet header section is the front wall (26) and the partition wall (27), and the flow control wall in the outlet header section (29) is the rear wall (26) and the partition wall (27). Although formed integrally with each other, the front wall (26) and the partition wall (27) are separated from each other, and the rear wall (26) and the partition wall (27) are separated from each other. An inlet header inner branch flow control wall (10) and an outlet header inner branch flow control wall (29) may be formed.

  The second member (17) is formed by extruding both the front and rear walls (26), the partition wall (27), the connecting wall (28), and the both diversion control walls (10) and (29), and then pressing the second member (17). Is formed by forming the coolant passage holes (20), (31A), and (31B) in the both shunt control walls (10) and (29), and further cutting the partition wall (27) to form the protrusions (27a). .

  Each cap (18), (19) is a plate shape having a shape substantially matching the cross-sectional shape of the outer shape of the first and second members (16), (17), and has an aluminum brazing having a brazing filler metal layer on both sides. The sheet is formed by pressing the sheet. On the front side of the right side cap (19), there is an upper left protrusion (30) that is fitted into a part above the flow dividing control wall (10) of the refrigerant inlet header (5), and a flow dividing control wall (10). The lower left protrusion (32) fitted into the lower portion is integrally formed with a space in the vertical direction, and on the rear side, the flow dividing control wall of the refrigerant outlet header (6) An upper left protrusion (33) fitted into the upper part of (29), and a lower left protrusion (34) fitted into the lower part of the flow dividing control wall (29). Are integrally formed at intervals in the vertical direction. In addition, an engaging claw (36) protruding leftward is formed integrally with the arc-shaped portion between the front and rear side edges and the upper edge of the right cap (19), and the front and rear portions of the lower edge. Has been. A refrigerant inlet (37) is formed in the bottom wall of the upper left protrusion (30) on the front side of the right cap (19), and a refrigerant outlet (38) is also formed on the bottom wall of the upper left protrusion (33) on the rear side. Is formed.

  The left side cap (18) is symmetrical with the right side cap (19), and is an upper right protrusion (39) that is fitted into the upper part of the flow dividing control wall (10) of the refrigerant inlet header (5). The lower right protrusion (44) that is fitted into the lower part of the flow dividing control wall (10) and the upper part of the refrigerant outlet header (6) above the flow dividing control wall (29) The upper right protrusion (41) to be inserted, the lower right protrusion (42) to be fitted in the part below the flow dividing control wall (29), and the upper and lower engaging claws (to the right) 43) are integrally formed. No openings are formed in the bottom walls of the upper right protrusions (39) and (41).

  The joint plate (21) is formed by pressing aluminum bare material, and has a short cylindrical refrigerant inlet (45) leading to the refrigerant inlet (37) of the right cap (19) and the refrigerant outlet. A short cylindrical refrigerant outlet (46) leading to (38). Bent portions (47) protruding leftward are formed at portions between the refrigerant inlet (45) and the refrigerant outlet (46) at both upper and lower edges of the joint plate (21). The upper and lower bent portions (47) are engaged with portions between the refrigerant inlet header portion (5) and the refrigerant outlet header portion (6), respectively. Further, engaging claws (48) protruding leftward are integrally formed at both front and rear ends of the lower edge of the joint plate (21). The engaging claw (48) is engaged with the lower edge portion of the right cap (19).

  The first and second members (16), (17), the caps (18), (19), and the joint plate (21) of the refrigerant inlet / outlet tank (2) are brazed as follows. That is, the first and second members (16), (17) are inserted into the through holes (25) of the first member (16) by the protrusions (27a) of the second member (17) and caulked. The brazing material of the first member (16) in a state where the upper ends of the rising walls (22a) before and after the one member (16) and the lower ends of both front and rear walls (26) of the second member (17) are engaged. They are brazed together using layers. Both caps (18) and (19) have front upper protrusions (39) and (30) on the front side of the partition walls (27) in both members (16) and (17) and the flow control wall in the inlet header section (10). The lower protrusions (44), (32) on the front side are in front of the partition walls (27) in both the members (16), (17), and more than the internal flow control wall (10) in the inlet header section. In the lower space, the rear upper protrusions (41), (33) are located behind the partition walls (27) of both members (16), (17) and from the outlet header inner flow control wall (29). The rear lower protrusions (42) and (34) are respectively fitted in the upper space and in the space behind the partition wall (27) and below the flow dividing control wall (29). The upper engaging claws (43) and (36) are engaged with the connecting wall (28) of the second member (17), and the lower engaging claws (43) and (36) are engaged with the first member (16). The first and second members 16 and 17 are brazed using the brazing material layers of the caps 18 and 19 while being engaged with the curved portion 22. In the joint plate (21), the upper bent portion (47) is engaged with the center portion in the front-rear direction of the right cap (19) and the portion between the connecting walls (28) of the second member (17), and the lower side The bent portion (47) is engaged with the center portion in the front-rear direction of the right cap (19) and the flat portion (24) of the first member (16), and the engaging claw (48) is engaged with the right cap (19). With the lower edge engaged, the right cap (19) is brazed using the brazing material layer of the right cap (19).

  Thus, the refrigerant inlet / outlet tank (2) is formed, the refrigerant inlet header portion (5) on the front side of the partition wall (27) of the second member (17) and the refrigerant on the rear side of the partition wall (27). It is the exit header (6). The refrigerant inlet header (5) is divided into two upper and lower spaces (5a) and (5b) by a flow dividing control wall (10), and these spaces (5a) and (5b) communicate with each other through a circular refrigerant passage hole (20). It has been made. The refrigerant outlet header (6) is divided into upper and lower spaces (6a) and (6b) by a flow dividing control wall (29), and these spaces (6a) and (6b) are oblong refrigerant passage holes (31A). (31B). The refrigerant inlet (37) of the right cap (19) communicates with the upper space (5a) of the refrigerant inlet header (5), and the refrigerant outlet (38) enters the upper space (6a) of the refrigerant outlet header (6). Communicates. Further, the refrigerant inlet (45) of the joint plate (21) is communicated with the refrigerant inlet (37), and the refrigerant outlet (46) is communicated with the refrigerant outlet (38). Here, the upper space (5a) of the refrigerant inlet header portion (5) is a first space communicating with the refrigerant inlet (37), and the lower space (5b) is a heat exchange pipe (13) of the front heat exchange pipe group (13). 12) is the second space. The upper space (6a) of the refrigerant outlet header (6) is a first space communicating with the refrigerant outlet (38), and the lower space (6b) is a heat exchange pipe (13) of the rear heat exchange pipe group (13). 12) is the second space.

  As shown in FIGS. 3 and 7-9, the refrigerant turn tank (3) is formed of a plate-shaped second tank formed of an aluminum brazing sheet having a brazing filler metal layer on both sides and connected to a heat exchange pipe (12). 1 member (70), 2nd member (71) which consists of the bare material formed from the aluminum extrusion shape, and covers the lower side of 1st member (70), and the aluminum brazing sheet which has a brazing material layer on both surfaces An aluminum cap (50) (72) (closing member) that is formed and closes both left and right openings, and has a refrigerant inflow header (9) and a refrigerant outflow header (11) on the outer surface of the left cap (50). The communication member (51) made of an aluminum bare material that is long in the front-rear direction is brazed so as to straddle the refrigerant, and the refrigerant inflow header portion (9) and the refrigerant outflow header portion (11) are connected to the left end via the communication member (51). It is made to communicate in the department.

  The top surface (3a) of the refrigerant turn tank (3) has a central part in the front-rear direction as the highest part (73) and gradually decreases from the highest part (73) toward the front and rear sides. The cross section is formed in a circular arc shape. Grooves (74) extending from the front and rear sides of the highest portion (73) on the top surface (3a) to the front and rear sides (3b) are spaced at the left and right sides of the refrigerant turn tank (3). A plurality are formed.

  The first member (70) has a cross-sectional arc shape in which a central portion in the front-rear direction protrudes upward, and a hanging wall (70a) is integrally formed over the entire length on both front and rear edges. The upper surface of the first member (70) is the top surface (3a) of the refrigerant turn tank (3), and the outer surface of the hanging wall (70a) is the front and rear side surfaces (3b) of the refrigerant turn tank (3). ing. On both the front and rear sides of the first member (70), a groove (74) is formed from the highest position (73) at the center in the front-rear direction to the lower end of the hanging wall (70a). A long tube insertion hole (75) is formed in the front-rear direction between adjacent grooves (74) in the front and rear side portions excluding the highest portion (73) of the first member (70). The front and rear pipe insertion holes (75) are at the same position in the left-right direction. A plurality of through holes (76) are formed at intervals in the left-right direction in the highest position (73) of the first member (70). The first member (70) is formed by simultaneously forming the hanging wall (70a), the groove (74), the tube insertion hole (75), and the through hole (76) by pressing the aluminum brazing sheet. .

  The second member (71) has a substantially w-shaped cross section opened upward, and extends between the front and rear walls (77) and the front and rear walls (77) extending in the left-right direction curved upward toward the outer side in the front-rear direction. A vertical partition wall (78) as a partition means provided in the center and extending in the left-right direction and partitioning the refrigerant turn tank (3) into two front and rear spaces, both front and rear walls (77) and partition walls (78 ) And two connecting walls 79 having a substantially arc-shaped cross section projecting downward, respectively connecting the lower ends of each of them together.

  The upper end portion of the rear wall (77) of the second member (71) and the partition wall (78) are integrally connected over the entire length by the branch flow control wall (52) (first flow control wall) in the outflow header. . A plurality of circular coolant passage holes (53) are formed in a penetrating manner at intervals in the left-right direction in a portion of the outflow header portion internal flow control wall (52) on the rear side of the center portion in the front-rear direction. The distance between the adjacent circular refrigerant passage holes (53) gradually increases as the distance from the left end increases, whereby the number of circular refrigerant passage holes (53) per unit length of the flow dividing control wall (52) is increased. It decreases toward the right. The intervals between adjacent circular refrigerant passage holes (53) may all be equal. Further, the circular refrigerant passage hole (53) is larger than the circular through hole (20) of the branch flow control wall (10) in the inlet header section. The upper end of the partition wall (78) protrudes upward from the upper ends of the front and rear walls (77), and a plurality of upper walls protrude upward and are fitted into the through holes (76) of the first member (70). The protrusions (78a) are integrally formed at intervals in the left-right direction. The protrusion (78a) is formed by cutting a predetermined portion of the partition wall (78). Here, the flow dividing control wall (52) in the outflow header section is formed integrally with the rear wall (77) and the partition wall (78), but is separate from the rear wall (77) and the partition wall (78). An outflow header inner branch flow control wall (52) may be formed by fixing the object.

  The second member (71) is formed by integrally extruding the front and rear walls (77), the partition wall (78), the connecting wall (79), and the flow dividing control wall (52), and then press-working to perform the flow dividing control wall. A circular refrigerant passage hole (53) is formed in (52), and the partition wall (78) is further cut to form a projection (78a).

  Each cap (50) (72) has a plate shape, and is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides. The left cap (50) includes a main body part (50a) having a shape matching the outer cross-sectional shape of the first and second members (70) (71), and an upper edge of the main body part (50a). And a substantially trapezoidal upper projecting portion (50b) that is integrally formed at the middle portion in the front-rear direction and projects upward from the first member (70). On the front side of the main body portion (50a) of the left cap (50), a right protruding portion (54) fitted into the refrigerant inflow header portion (9) is integrally formed, and on the rear side, the refrigerant outflow header is also formed. Upper right protrusion (55) fitted into the upper part of the part (11) above the flow dividing control wall (52), and lower side fitted into the part below the flow dividing control wall (52) The right projecting portion (56) is integrally formed with a space in the vertical direction. In addition, the engaging claw (57) protruding rightward at the arc-shaped part between the front and rear side edges and the lower edge of the main body part (50a) of the left cap (50) and the part near the front and rear ends of the upper edge, respectively. Further, an engaging claw (58) protruding leftward is formed at each of the inclined side portions of the upper protruding portion (50b) and the central portion in the front-rear direction of the lower edge of the main body portion (50a). Through holes (59), (60) are formed in the bottom wall of the front right protrusion (54) on the left side cap (50) and the bottom wall of the rear lower right protrusion (56), respectively. . The front through hole (59) communicates the inside of the refrigerant inflow header (9) to the outside, and the rear through hole (60) is located below the flow dividing control wall (52) of the refrigerant outflow header (11). Let the inside of the part communicate with the outside.

  On the front side of the right cap (72), a left projecting portion (81) that is fitted into the refrigerant inflow header portion (9) is integrally formed, and on the rear side, a branch flow of the refrigerant outflow header portion (11) is formed. An upper left protrusion (82) fitted into the upper part of the control wall (52) and a lower left protrusion (83) fitted into the lower part of the flow dividing control wall (52). ) Are integrally formed with an interval in the vertical direction. In addition, an engaging claw (84) projecting leftward is formed integrally with the arc-shaped portion between the front and rear side edges and the lower edge of the right cap (72) and the upper edge near the front and rear ends. Yes. No through hole is formed in the bottom wall of the right protrusion (81) and the lower right protrusion (83).

  The communicating member (51) is formed by pressing an aluminum bare material, and has a plate shape that is the same shape and size as the left cap (50) when viewed from the left, and its peripheral portion is on the left side. The outer surface of the cap (50) is brazed. The communication member (51) is formed with an outward bulging portion (61) so as to be passed through the two through holes (59) and (60) of the left cap (50). The inside of the outward bulge portion (61) serves as a communication path (62) that allows both through holes (59) and (60) of the left cap (50) to pass through. The upper end portion of the outward bulge portion (61) is located at the upper end portion of the upper protruding portion (50b) of the left cap (50), so that the passage area of the communication passage (62) is limited space. It is taken greatly in.

  The first and second members (70), (71), the caps (50), (72), and the communication member (51) of the refrigerant turn tank (3) are brazed as follows. That is, the first and second members (70), (71) are inserted into the through holes (76) and caulked by the protrusions (78a) of the second member (71), thereby Using the brazing material layer of the first member (70), the lower end of the hanging wall (70a) and the upper ends of the front and rear walls (77) of the second member (71) are engaged with each other. It is brazed. Both caps (50), (72) have rear upper protrusions (54, 81) in the space in front of the partition walls (78) of both members (70) (71) ( (55) (82) is a rear lower projection (56) (56) in the space behind the partition wall (78) in both members (70) (71) and above the flow dividing control wall (52). 83) are fitted into the spaces behind both of the members (70) and (71) from the partition wall (78) and below the flow dividing control wall (52), and the upper engaging claws (57) (84) is engaged with the first member (70), and the lower engaging claws (57) (84) are engaged with the front and rear walls (77) of the second member (71). The first and second members (70) (71) are brazed using the brazing material layer of each cap (50) (72). The communicating member (51) is a left cap (50) using the brazing material layer of the left cap (50) in a state where the engaging claw (58) of the left cap (50) is engaged with the communicating member (51). 50) is brazed.

  Thus, the refrigerant turn tank (3) is formed, the refrigerant inflow header portion (9) on the front side of the partition wall (78) of the second member (71) and the refrigerant on the rear side of the partition wall (78). It is an outflow header (11). The refrigerant outflow header (11) is divided into two upper and lower spaces (11a) and (11b) by a flow dividing control wall (52), and these spaces (11a) and (11b) communicate with each other through a circular refrigerant passage hole (53). It has been made. The rear through hole (60) of the left cap (50) communicates with the lower space (11b) of the refrigerant outflow header portion (11). The inside of the refrigerant inflow header (9) and the inside of the lower space (11b) of the refrigerant outflow header (11) are outside the through holes (59) (60) and the communication member (51) of the left cap (50). It is connected via the communication path (62) in the side bulge part (61). Here, the lower space (11b) of the refrigerant outflow header portion (11) is a first space communicating with the refrigerant inflow header portion (9), and the upper space (11a) is the heat of the rear heat exchange tube group (13). This is the second space where the exchange pipe (12) faces.

  The heat exchange pipe (12) constituting the front and rear heat exchange pipe group (13) 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 (12a) are formed in parallel. The front and rear end walls of the heat exchange pipe (12) have an arc shape protruding outward. The heat exchange pipe (12) of the front heat exchange pipe group (13) and the heat exchange pipe (12) of the rear heat exchange pipe group (13) are arranged at the same position in the left-right direction. The upper end of the heat exchange pipe (12) is inserted into the pipe insertion hole (23) of the first member (16) of the refrigerant inlet / outlet tank (2) and uses the brazing material layer of the first member (16). The first member (16) is brazed, and the lower end portion of the first member (70) is inserted into the pipe insertion hole (75) of the first member (70) of the refrigerant turn tank (3). The first member (70) is brazed using the layer. Then, the heat exchange pipe (12) of the front heat exchange pipe group (13) communicates with the refrigerant inlet header part (5) and the refrigerant inflow header part (9), and the heat exchange pipe of the rear heat exchange pipe group (13). (12) communicates with the refrigerant outlet header (6) and the refrigerant outflow header (11).

  Here, the tube height (h) which is the thickness in the left-right direction of the heat exchange tube (12) is 0.75 to 1.5 mm (see FIG. 10), the tube width which is the width in the front-rear direction is 12 to 18 mm, and the peripheral wall The wall thickness of the partition wall is 0.175 to 0.275 mm, the thickness of the partition wall partitioning the refrigerant passages (12a) is 0.175 to 0.275 mm, the pitch of the partition wall is 0.5 to 3.0 mm, both front and rear walls The curvature radius of the outer surface is preferably 0.35 to 0.75 mm.

  As the heat exchange pipe (12), instead of one made of an aluminum extruded shape, a pipe 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. In this case, a corrugated fin made of a bare material is used.

  As shown in FIG. 10, the corrugated fin (14) is formed in a corrugated shape using an aluminum brazing sheet having a brazing filler metal layer on both sides. The corrugated fin (14a), the wave bottom (14b), and the wave crest ( 14a) and a flat horizontal connecting portion (14c) connecting the wave bottom portion (14b), and a plurality of louvers are formed in the connecting portion (14c) side by side in the front-rear direction. The corrugated fin (14) is shared by the front and rear heat exchange pipes (12), and the width in the front and rear direction is the front edge of the front heat exchange pipe (12) and the rear edge of the rear heat exchange pipe (12). Are substantially equal to each other (see FIG. 3). And the wave crest part (14a) and the wave bottom part (14b) of the corrugated fin (14) are brazed to the heat exchange pipe (12). In addition, instead of sharing one corrugated fin between the front and rear heat exchange tube groups (13), corrugated fins are respectively arranged between adjacent heat exchange tubes (12) of both heat exchange tube groups (13). It may be.

  Here, the linear distance between the wave crest portion (14a) and the wave bottom portion (14b), which is the fin height (H) of the corrugated fin (14), is 7.0 mm to 10.0 mm, and the connection is also the fin pitch (P). The pitch of the part (14c) is preferably 1.3 to 1.7 mm. The corrugated fin (14) has a wave crest (14a) and a wave bottom (14b) that are flatly brazed to the heat exchange pipe (12), and provided on both sides of the flat part and connected to each other ( 14c), the radius of curvature (R) of the rounded portion is preferably 0.7 mm or less.

  The evaporator (1) is manufactured by temporarily fastening a combination of the constituent members and brazing all the constituent members together.

  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 above-described evaporator (1), as shown in FIG. 11, the gas-liquid mixed phase two-layer refrigerant that has passed through the compressor, the condenser, and the expansion valve flows from the refrigerant inlet pipe (7) to the refrigerant inlet of the joint plate (21). (45) and the right side cap (19) through the refrigerant inlet (37) and into the upper space (5a) of the refrigerant inlet header (5) of the refrigerant inlet / outlet tank (2), and then the flow control wall in the inlet header Passes through the circular refrigerant passage hole (20) of (10) into the lower space (5b) and divides it into the refrigerant passages (12a) of all the heat exchange tubes (12) of the front heat exchange tube group (13). Flow into.

  At this time, since the amount of refrigerant passing through all the circular refrigerant passage holes (20) is made uniform by imparting resistance to the refrigerant flow by the inlet header diversion control wall (10), the refrigerant inlet header section ( 5) The flow of the refrigerant flowing into the front heat exchange pipe group (13) to all the heat exchange pipes (12) is made uniform, and all the heat exchange pipes (12) of the front heat exchange pipe group (13) Bias in the temperature distribution of the refrigerant flowing through the refrigerant is suppressed.

  The refrigerant that has flowed into the refrigerant passages (12a) of all the heat exchange tubes (12) flows downward in the refrigerant passages (12a) and enters the refrigerant inflow header portion (9) of the refrigerant turn tank (3). . The refrigerant that has entered the refrigerant inflow header (9) flows to the left, the front through hole (59) of the left cap (50), the communication path in the outward bulge (61) of the communication member (51) ( 62) and the rear through-hole (60) of the left cap (50) are turned to change the flow direction and enter the lower space (11b) of the refrigerant outflow header (11).

  Further, the front heat exchange pipe is caused by the fact that the refrigerant branch flow from the refrigerant inlet header (5) to all the heat exchange pipes (12) of the front heat exchange pipe group (13) is not sufficiently uniformized. Even if the distribution of the temperature (refrigerant dryness) of the refrigerant flowing through all the heat exchange pipes (12) of the group (13) is uneven, the refrigerant inflow header (9) to the refrigerant outflow header (11) When turning into the lower space (11b) and flowing in, all the refrigerant is mixed, and the temperature becomes uniform throughout.

  The refrigerant that has entered the lower space (11b) of the refrigerant outflow header (11) flows to the right, passes through the circular refrigerant passage hole (53) in the flow dividing control wall (52) in the outflow header, and enters the upper space (11a). And then flows into the refrigerant passages (12a) of all the heat exchange tubes (12) of the rear heat exchange tube group (13).

  At this time, a large amount of refrigerant tends to flow toward the right end portion in the lower space (11b) of the refrigerant outflow header portion (11), but the circular refrigerant passage hole per unit length of the diversion control wall (52) ( Since the number of 53) decreases toward the right end, the amount of refrigerant in the upper space (11a) is made uniform over the entire length of the upper space (11a). As a result, the flow of refrigerant to all the heat exchange tubes (12) in the rear heat exchange tube group (13) is made uniform, and all the heat exchange tubes (12) in the rear heat exchange tube group (13) are connected. Bias in the distribution of the temperature of the flowing refrigerant is suppressed.

  The refrigerant flowing into the refrigerant passage (12) of the heat exchange pipe (12) changes the flow direction and flows upward in the refrigerant passage (12a) to enter the lower space (6b) of the refrigerant outlet header (6). Enters into the upper space (6a) through the oblong coolant passage holes (31A) and (31B) of the outlet flow control wall (29) in the outlet header. Here, since resistance is given to the flow of the refrigerant by the shunt control wall (29), all the heat exchange pipes of the rear heat exchange pipe group (13) from the upper space (11a) of the refrigerant outflow header section (11). The flow to (12) is made uniform, and the flow from the lower space (5b) of the refrigerant inlet header (5) to all the heat exchange tubes (12) in the front heat exchange tube group (13) is even more uniform. It becomes. As a result, the refrigerant circulation amount of all the heat exchange tubes (12) in both heat exchange tube groups (13) is made uniform, and the temperature distribution of the entire heat exchange core portion (4) is also made uniform.

  Next, the refrigerant that has entered the upper space (6a) of the refrigerant outlet header (6) passes through the refrigerant outlet (38) of the right cap (19) and the refrigerant outlet (46) of the joint plate (21). It flows out to the outlet pipe (8). The refrigerant passes through the refrigerant passage (12a) of the heat exchange tube (12) of the front heat exchange tube group (13) and the refrigerant passage (12a) of the heat exchange tube (12) of the rear heat exchange tube group (13). During the flow, the ventilation gap exchanges heat with the air flowing in the direction indicated by the arrow X in FIGS. 1 and 11 and flows out as a gas phase.

  At this time, condensed water is generated on the surface of the corrugated fin (14), and this condensed water flows down to the top surface (3a) of the refrigerant turn tank (3). The condensed water flowing down to the top surface (3a) of the refrigerant turn tank (3) enters the groove (74) by the capillary effect, flows in the groove (74), and flows from the outer end in the front-rear direction to the refrigerant turn tank. Drop down (3). In this way, freezing of condensed water caused by accumulation of a large amount of condensed water between the top surface (3a) of the refrigerant turn tank (3) and the lower end of the corrugated fin (14) is prevented, and as a result, the evaporator (1 ) Performance degradation is prevented.

  In the above embodiment, between the refrigerant inlet header portion (5) and the refrigerant inflow header portion (9) of both tanks (2) and (3), and the refrigerant outlet header portion (6) and the refrigerant outflow header portion (11). However, the present invention is not limited to this, and the refrigerant inlet header portion (5) and the refrigerant inflow header portion of both tanks (2) and (3) are not limited to this. One or two or more heat exchange pipe groups (13) may be provided between the refrigerant outlet header section (6) and the refrigerant outlet header section (11). In the above embodiment, the refrigerant inlet / outlet tank (2) is on the upper side and the refrigerant turn tank (3) is on the lower side. It may be used with the turn tank (3) on top.

  Moreover, in the said embodiment, although the heat exchanger by this invention is applied to the evaporator, it is not limited to this.

Furthermore, the evaporator according to the present invention includes a compressor, a gas cooler, an evaporator, an expansion valve as a decompressor, an accumulator as a gas-liquid separator, and a refrigerant that has come out of the gas cooler and has passed through the gas-liquid separator. And an intermediate heat exchanger that exchanges heat with each other, and is also used in an evaporator of a supercritical refrigeration cycle that uses a supercritical refrigerant such as CO ₂ . Such a supercritical refrigeration cycle is used as a car air conditioner in a vehicle such as an automobile.

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 the intermediate part which looked at the evaporator shown in FIG. 1 from back. It is the AA line expanded sectional view of Drawing 2 which omitted some. It is a disassembled perspective view of the part of the tank for a refrigerant | coolant in / out. It is the BB expanded sectional view of FIG. 2 which abbreviate | omitted one part. It is CC sectional view taken on the line of FIG. It is a disassembled perspective view of the part of the tank for refrigerant | coolant turns. FIG. 3 is an enlarged view taken along line DD in which a part of FIG. 2 is cut away. It is the EE sectional view taken on the line of FIG. It is a figure which expands and shows a part of heat exchange core part of the evaporator shown in FIG. It is a figure which shows how the refrigerant | coolant flows in the evaporator shown in FIG.

(1): Evaporator
(2): Refrigerant tank
(3): Refrigerant turn tank
(4): Heat exchange core
(5): Refrigerant inlet header
(5a): Upper space (first space)
(5b): Lower space (second space)
(6): Refrigerant outlet header
(6a): Upper space (first space)
(6b): Lower space (second space)
(9): Refrigerant inflow header (refrigerant inflow side intermediate header)
(10): Inlet header diversion control wall (second diversion control wall)
(11): Refrigerant outflow header (refrigerant outflow side intermediate header)
(11a): Upper space (second space)
(11b): Lower space (first space)
(12): Heat exchange pipe
(13): Heat exchange tube group
(14): Corrugated fin
(14a): Wave peak
(14b): Wave bottom
(14c): Connection part
(16): First member
(17): Second member
(18) (19): Cap (closing member)
(20): Refrigerant passage hole
(27): Partition wall
(29): Shunt control wall in the outlet header (third shunt control wall)
(31A) (31B): Refrigerant passage hole
(50): Left side cap (closing member)
(50a): Body part
(50b): Upper protrusion
(51): Communication member
(52): Outflow header internal diversion control wall (first diversion control wall)
(53): Refrigerant passage hole
(59) (60): Through hole
(61): Outward bulge
(62): Communication passage
(70): First member
(71): Second member
(72): Right side cap (closing member)
(78): Partition wall

Claims (26)

A refrigerant inlet header portion having a refrigerant inlet, a refrigerant outlet header portion located on the rear side of the refrigerant inlet header portion and having a refrigerant outlet, and a refrigerant circulation path through which the refrigerant inlet header portion and the refrigerant outlet header portion are passed. , the refrigerant circulation path, and at least two intermediate header section, the inlet header, outlet header and Ri Na more and more heat exchange tubes establishing communication with all the intermediate header section, refrigerant inflow-side intermediate header refrigerant flows In the heat exchanger in which the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part and the refrigerant outflow side intermediate header part are communicated at one end .
In the refrigerant outflow side intermediate header part, first diversion control means for equalizing the refrigerant diversion to the heat exchange pipe connected to the refrigerant outflow side intermediate header part is provided, and the first diversion control means is The first flow control wall has a plurality of refrigerant passage holes and divides the refrigerant outflow side intermediate header portion into two spaces in the height direction, and includes a refrigerant inflow side intermediate header portion and a refrigerant outflow side intermediate header portion. 1 space is communicated at one end, a heat exchange pipe connected to the refrigerant outflow side intermediate header portion faces the second space, and a plurality of refrigerant passage holes are formed in the first diversion control wall. The intervals between adjacent refrigerant passage holes are gradually increased as they move away from the end on the side where the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part communicate with each other. heat exchanger it is. A heat exchange core group configured by arranging a plurality of rows of heat exchange tubes arranged in the front-rear direction and a plurality of heat exchange tubes arranged at intervals, and arranged on one end side of the heat exchange tube, And the refrigerant | coolant inlet header part to which the heat exchange pipe | tube of the heat exchange pipe group of at least 1 row 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, and the heat of the remaining heat exchange pipe | tube groups. Heat exchange with a refrigerant outlet header portion connected to the exchange pipe, a refrigerant inflow side intermediate header portion arranged on the other end side of the heat exchange pipe, and connected to a heat exchange pipe connected to the refrigerant inlet header portion A refrigerant outflow side intermediate header portion disposed on the rear side of the refrigerant inflow side intermediate header portion on the other end side of the tube and connected to a heat exchange pipe of a heat exchange tube group connected to the refrigerant outlet header portion. The heat exchanger according to claim 1. The heat exchanger according to claim 1 or 2 , wherein the refrigerant passage hole is formed on the rear side of the center portion in the front-rear direction of the first diversion control wall . The refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part are provided by dividing the inside of one refrigerant turn tank forward and backward by partition means. Heat exchanger. The heat exchanger according to claim 4, wherein a communication member that communicates the refrigerant inflow side intermediate header part and the refrigerant outflow side intermediate header part is provided at one end of the refrigerant turn tank . A refrigerant turn tank includes a first member connected to the heat exchange pipe, a second member brazed to a portion of the first member opposite to the heat exchange pipe, and both ends of the first and second members. A first shunt control wall comprising a brazed closure member, the second member having partitioning means and a plurality of refrigerant passage holes, and dividing the inside of the refrigerant outflow side intermediate header into two spaces in the height direction. The heat exchanger according to claim 4 or 5, wherein is integrally formed . Either one of the closing members is formed with a through hole that communicates the refrigerant inflow side intermediate header part and the first space communicating with the refrigerant inflow side intermediate header part in the refrigerant outflow side intermediate header part to the outside. The heat exchanger according to claim 6, wherein a communication member for communicating both through holes is brazed to the outer surface of the closing member . The closing member having a through hole is plate-shaped, and the communication member is a plate having the same shape and the same size as the closing member as viewed from the side, and the inside communicates with both through-holes of the closing member. The heat exchanger according to claim 7, wherein an outward bulging portion serving as a communication path is formed . The main body portion having the same contour as the cross section of the outer shape of the refrigerant turn tank, and a projecting portion projecting from the main body portion toward the refrigerant inlet header portion and the refrigerant outlet header portion. The heat exchanger according to claim 8, wherein the outward bulge portion of the member is formed to correspond to the main body portion and the protruding portion of the closing member . The heat exchanger according to any one of claims 6 to 9, 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 any one of claims 6 to 10, wherein the second member is made of an aluminum extruded profile . The heat exchanger according to any one of claims 7 to 11, wherein the closing member having a through hole is made of an aluminum brazing sheet having a brazing filler metal layer on both sides . The second branch flow control means for equalizing the branch flow of the refrigerant to the heat exchange pipe connected to the refrigerant inlet header portion is provided in the refrigerant inlet header portion . Heat exchanger. The second diversion control means includes a second diversion control wall having a plurality of refrigerant passage holes and dividing the refrigerant inlet header portion into two spaces in the height direction, and the refrigerant inlet communicates with the first space. The heat exchanger according to claim 13, wherein the heat exchange pipe connected to the refrigerant inlet header faces the second space . The plurality of refrigerant passage holes are formed in the second diversion control wall at intervals in the length direction, and the refrigerant passage holes are smaller than the refrigerant passage holes of the first diversion control means. The described heat exchanger. The third branch flow control means for equalizing the branch flow of the refrigerant to the heat exchange pipe connected to the refrigerant outlet header portion is provided in the refrigerant outlet header portion . Heat exchanger. The third diversion control means includes a third diversion control wall having a refrigerant passage hole and dividing the inside of the refrigerant outlet header portion into two spaces in the height direction, and the refrigerant outlet is communicated with the first space. The heat exchanger according to claim 16, wherein the heat exchange pipe connected to the refrigerant outlet header portion faces the second space . The heat exchanger according to any one of claims 14 to 17 , wherein the refrigerant inlet header portion and the refrigerant outlet header portion are provided by dividing one refrigerant inlet / outlet tank forward and backward by a partitioning means . The refrigerant inlet / outlet tank includes a first member connected to the heat exchange pipe, a second member brazed to a portion of the first member opposite to the heat exchange pipe, and both ends of the first and second members. A second shunting control wall and a refrigerant, each comprising a brazing closure member, the second member having partition means, a plurality of refrigerant passage holes, and dividing the inside of the refrigerant inlet header into two spaces in the height direction; The heat exchanger according to claim 18, wherein a third branch flow control wall having a passage hole and dividing the refrigerant outlet header portion into two spaces in the height direction is integrally formed . The heat exchanger according to claim 19, 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 19 or 20, wherein the second member is made of an aluminum extruded profile . The heat exchange pipe is flat, and is arranged with its width direction facing the front-rear direction, and the pipe height, which is the thickness of the heat exchange pipe, is 0.75 to 1.5 mm. A heat exchanger according to any of the above. A fin is disposed between adjacent heat exchange tubes, and the fin has a corrugated shape including a wave crest portion, a wave bottom portion, and a flat coupling portion that connects the wave crest portion and the wave bottom portion, and a wave having a fin height. The linear distance between the top portion and the wave bottom portion is 7.0 mm to 10.0 mm, and the pitch of the connecting portions that are also fin pitches is 1.3 to 1.7 mm. Exchanger. The corrugated fin has a wave crest and a wave bottom formed of a flat portion and rounded portions provided on both sides of the flat portion and connected to the connecting portion, and the radius of curvature of the rounded portion is 0.7 mm or less. The described heat exchanger. A refrigeration cycle comprising a heat exchanger according to any one of claims 1 to 24, comprising a compressor, a condenser, and an evaporator . A vehicle in which the refrigeration cycle according to claim 25 is mounted as a car air conditioner .

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