JP4613083B2 - Heat exchanger - Google Patents

Description

This invention relates to heat exchangers.

  In this specification and claims, the direction indicated by the arrow X in FIG. 1 (the right side in FIG. 2) is the front, and the opposite side is the rear.

  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 that satisfies such a requirement, the present applicant has firstly arranged first and second header tanks that are spaced apart from each other, and a heat exchange core portion provided between both header tanks. The refrigerant inlets located on the downstream side of the ventilation direction by dividing the inside of the first header tank in the ventilation direction by a partition wall in the first header tank. A header portion and a refrigerant outlet header portion located upstream in the ventilation direction are provided, and the inside of the refrigerant outlet header portion is partitioned into two upper and lower spaces by a shunt resistor plate formed integrally with the refrigerant outlet header portion. A refrigerant located on the downstream side in the ventilation direction by forming a plurality of refrigerant passage holes in the shunt resistor plate and partitioning the inside of the second header tank in the ventilation direction by a partition wall Heat exchange comprising a plurality of heat exchange pipes provided with an inlet header portion and a refrigerant outflow header portion positioned upstream in the ventilation direction, and a heat exchange core portion disposed at intervals in the length direction of both header tanks The tube group is configured by arranging a plurality of rows side by side in the ventilation direction, and both ends of the heat exchange tubes of the heat exchange tube group of at least one row are connected to the refrigerant inlet header portion and the refrigerant inflow header portion, and the other heat An evaporator has been proposed in which both ends of the heat exchange tubes of the exchange tube group are connected to the refrigerant outlet header portion and the refrigerant outflow header portion (see Patent Document 1). This evaporator is manufactured by combining and temporarily fixing the constituent members and brazing all the constituent members together.

  And in the evaporator of patent document 1, the refrigerant | coolant flow volume of all the heat exchange pipes which comprise each heat exchange pipe group is equalize | homogenized by the effect | action of the resistance plate for a shunt, and, thereby, the heat exchange performance of an evaporator is improved. It is illustrated.

However, when assembling each component during the manufacture of the evaporator, the cross-sectional shape of the outer shape of the first header tank is symmetric in the front-rear direction, and the shunt resistor plate cannot be confirmed from the outside. There is a risk of assembly in the opposite direction. In this case, the effect of making the amount of refrigerant in all the heat exchange tubes uniform is hardly obtained, and the cooling performance of the evaporator may be extremely lowered.
Japanese Patent Laid-Open No. 2003-75024

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

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

1) First and second header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks And the first header tank is partitioned forward and backward by the partitioning means to provide the refrigerant inlet header portion and the coolant outlet header portion, and the second header tank is partitioned forward and backward by the partitioning means. Two intermediate header portions are provided, a plurality of heat exchange tubes are arranged in parallel between the refrigerant inlet header portion and one intermediate header portion, and both end portions thereof are respectively connected to both header portions, and the refrigerant outlet header A plurality of heat exchange tubes are arranged in parallel between the first header portion and the other intermediate header portion, and both end portions thereof are connected to both header portions, respectively, and a cross-sectional shape of the outer shape of at least one header tank Each header tank includes a first member to which the heat exchange pipe is connected, and a second member made of extruded shape material brazed to a portion of the first member opposite to the heat exchange pipe. The protrusions extending in the length direction are integrally formed at positions shifted from the front and rear centers on the outer surface of the second member of the first header tank, and the cross-sectional shape of the outer shape of the second member is excluding the protrusions. The refrigerant outlet header is divided into two spaces by the partitioning means, and the heat exchange pipe is connected to the refrigerant outlet header so as to face one of the spaces, and a refrigerant passage hole is formed in the partitioning means. A heat exchanger in which the partitioning means and the partitioning means are integrally formed with the second member .

2) The heat exchanger according to 1) above, wherein the first member comprises a brazing sheet having a brazing material layer on at least one side .

According to the heat exchanger of the above 1) , when manufacturing the heat exchanger, it is possible to determine the exact direction of the length direction based on the outer shape of the header tank, so the header tank is assembled in the reverse direction. Can be reliably prevented. Therefore, when a means for improving the performance of the heat exchanger is provided in the header tank, the position can be accurately determined as a set portion, and as a result, the heat exchange performance of the heat exchanger is improved. Moreover, when the header tank is held in a state where the header tank is held by a jig having a recess into which the outer portion of the header tank fits, if the header tank is in the reverse direction, it will not fit in the recess of the jig. Thus, it is possible to automatically determine whether or not the header tank is in the reverse direction.

According to the heat exchanger of 1) , the cross-sectional shape of the outer shape of the header tank can be made asymmetrical in the front-rear direction.

According to the heat exchanger of the above 1) , the orientation of the first header tank is accurately set so that the refrigerant inlet header is located on the front side and the refrigerant outlet header provided with the partition means is located on the rear side. I can decide. Therefore, it becomes possible to equalize the refrigerant amounts of all the heat exchange tubes by the function of the partition means, and the heat exchange performance is excellent. In addition, the number of parts in the entire heat exchanger can be reduced.

According to the heat exchanger of 2) above , the first member is formed simultaneously with the formation of the tank by brazing the first member and the second member using the brazing material layer on at least one side of the first member. can be connected to the tank brazed and heat exchange tubes of heat exchanger tubes, the manufacturing operation is simplified.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the heat exchanger according to the present invention is applied to an evaporator of a refrigeration cycle using a chlorofluorocarbon refrigerant.

  In the following description, the top and bottom and the left and right in FIG.

  1 and 2 show the overall configuration of the evaporator, FIGS. 3 and 4 show the configuration of the main part, and FIG. 5 shows how the refrigerant flows in the evaporator. FIG. 6 shows an evaporator manufacturing method.

  1 and 2, the evaporator (1) includes an aluminum refrigerant inlet / outlet header tank (2) (first header tank) and an aluminum refrigerant turn header tank (3) arranged at intervals in the vertical direction. (Second header tank) and a heat exchange core section (4) provided between the header tanks (2) and (3).

  The refrigerant inlet / outlet tank (2) includes a refrigerant inlet header part (5) located on the front side (downstream side in the ventilation direction) and a refrigerant outlet header part (6) located on the rear side (upstream side in the ventilation direction). Yes. An aluminum refrigerant inlet pipe (7) is connected to the refrigerant inlet header section (5) of the refrigerant inlet / outlet tank (2), and an aluminum refrigerant outlet pipe (8) is also connected to the refrigerant outlet header section (6). Yes. The refrigerant turn header tank (3) includes a refrigerant inflow header portion (9) (intermediate header portion) located on the front side and a refrigerant outflow header portion (11) (intermediate header portion) located on the rear side.

  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. 2 and 3, 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 from an aluminum extruded profile and covering the upper side of the first member (16), and an aluminum cap (18) (19 The cross-sectional shape of the outer shape is symmetric in the front-rear direction. A joint plate made of an aluminum bear 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) of the refrigerant inlet / outlet tank (2). 21) is brazed. A refrigerant inlet pipe (7) and a 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 first member (16) is formed by simultaneously pressing the aluminum brazing sheet to form both curved portions (22), pipe insertion holes (23), flat portions (24) and through holes (25). able to make. The cross-sectional shape of the outer shape of the first member (16) is symmetric in the front-rear direction.

  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. In addition, the partition wall (27) as a partition means for partitioning the refrigerant inlet / outlet header tank (2) into two front and rear spaces, and the upper ends of the front and rear walls (26) and the upper end of the partition wall (27) are integrally connected to each other. And two connecting walls (28) having a substantially arc-shaped cross section projecting from each other.

  The lower end portions of the rear wall (26) and the partition wall (27) of the second member (17) serve as partition means for partitioning the refrigerant outlet header portion (6) into two upper and lower spaces (6a) and (6b). The shunt resistor plate (29) is integrally connected over the entire length. A plurality of refrigerant passage holes (31A) (31B) 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 end portions in the rear portion of the shunt resistor plate (29). ing. 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).

  From one of the two arcuate connecting walls (28) of the second member (17), here the center of the second member (17) on the outer surface of the arcuate connecting wall (28) on the rear side A protruding line (30) extending in the length direction is integrally formed at the shifted position. Thereby, the cross-sectional shape of the external shape of the second member (17) is asymmetric in the front-rear direction. The cross-sectional shape of the outer shape of the second member (17) excluding the ridges (30) is symmetrical in the longitudinal direction.

  The second member (17) is formed by integrally extruding the front and rear walls (26), the partition wall (27), the connecting wall (28), the shunt resistor plate (29) and the ridges (30), and then press working. The refrigerant flow holes (31A) and (31B) are formed in the shunting resistance plate (29), and the partition wall (27) is further cut to form the protrusions (27a).

  Each cap (18) (19) is formed by pressing, forging or cutting from an aluminum brazing sheet having a brazing filler metal layer on both sides. On the front side of the right cap (19), a left protruding portion (32) that is fitted into the refrigerant inlet header portion (5) is integrally formed, and on the rear side, the refrigerant outlet header portion (6) is divided. The upper left protrusion (33) that fits in the space (6a) above the diversion resistance plate (29) and the space (6b) below the diversion resistance plate (29) The lower left protrusion (34) is integrally formed with a space in the vertical direction. In addition, an engaging claw (35) 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). Further, an engaging claw (36) projecting leftward is formed integrally with the front side portion and the rear side portion of the lower edge of the right cap (19). A refrigerant inlet (37) is formed in the bottom wall of the front left protrusion (32) of the right cap (19), and a refrigerant outlet (38) is also formed in the bottom wall of the rear upper left protrusion (33). Is formed. The left cap (18) is symmetrical with the right cap (19), and the rightward projecting portion (39) fitted into the refrigerant inlet header portion (5) and the shunt resistor plate of the refrigerant outlet header portion (6) Upper right protrusion (41) that fits in space (6a) above (29), lower right that fits in space (6b) below shunt resistor plate (29) The projecting portion (42) and the upper and lower engaging claws (43) and (44) projecting to the right are integrally formed. No opening is formed in the bottom wall of the right protrusion (39) and the upper right protrusion (41).

  The joint plate (21) has a short cylindrical refrigerant inlet (45) leading to the refrigerant inlet (37) of the right cap (19) and a short cylindrical refrigerant outlet (46) also leading to the refrigerant outlet (38). I have. 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) of the refrigerant inlet / outlet header tank (2), the caps (18), (19), and the joint plate (21) 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) are arranged so that the front protrusions (39) and (32) are in the space on the front side of the partition walls (27) in both members (16) and (17), and the rear upper protrusions ( 41) (33) is located behind the partition wall (27) in both members (16) and (17) and above the shunt resistor plate (29), and the rear lower protrusion (42 ) (34) are respectively fitted in the spaces behind the partition wall (17) and below the shunt resistor plate (29), and the upper engaging claws (43) (35) are second With the lower engaging claws (44) (36) engaged with the curved portion (22) of the first member (16) engaged with the connecting wall (28) of the member (17), The first and second members 16 and 17 are brazed using the brazing material layers of both caps 18 and 19. 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, a refrigerant inlet / outlet header tank (2) is formed, the front side of the partition wall (27) of the second member (17) is the refrigerant inlet header part (5), and the rear side of the partition wall (27) is the same. It becomes a refrigerant | coolant exit header part (6). The refrigerant outlet header (6) is divided into upper and lower spaces (6a) and (6b) by a shunt resistor plate (29), and these spaces (6a) and (6b) are formed in the refrigerant passage holes (31A) ( 31B). The refrigerant outlet (38) of the right cap (19) communicates with the upper space (6a) of the refrigerant outlet header (6). 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).

  As shown in FIGS. 2 and 4, the refrigerant turn header tank (3) 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). (70), a second member (71) made of a bare material formed from an extruded aluminum material and covering the lower side of the first member (70), and an aluminum brazing sheet having a brazing material layer on both sides. In addition, the cap is made of an aluminum cap (72) that closes both left and right openings, and its cross-sectional shape is asymmetrical in the front-rear direction.

  The top surface (3a) of the header tank (3) for the refrigerant turn is such that the central part in the front-rear direction becomes the highest part (73) and gradually decreases from the highest part (73) toward the front and rear sides. The entire cross section is formed in an arc shape. Grooves (74) extending from the front and rear sides of the highest part (73) on the top surface (3a) to the front and rear sides (3b) are spaced in the left and right direction on both sides of the refrigerant turn header 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 top surface of the first member (70) is the top surface (3a) of the refrigerant turn header tank (3), and the outer surface of the hanging wall (70a) is the front and rear side surfaces (3b) of the refrigerant turn header tank (3). It has become. 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 cross-sectional shape of the outer shape of the first member (70) is symmetrical in the front-rear direction.

  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 header tank (3) into two front and rear spaces, and both front and rear walls (77) and partition walls And two connecting walls (79) for connecting the lower ends of (78) together.

  The upper end of the partition wall (78) of the second member (71) protrudes higher than the upper ends of the front and rear walls (77), and protrudes upward at the upper edge of the partition wall (78). A plurality of protrusions (78a) to be fitted into 76) are integrally formed at intervals in the left-right direction. Further, a coolant passage notch (78b) is formed between adjacent protrusions (78a) on the partition wall (78) from the upper edge thereof. The protrusion (78a) and the notch (78b) are formed by cutting a predetermined portion of the partition wall (78).

  One of the two connecting walls (79) of the second member (71), here the outer surface of the connecting wall (79) on the rear side is shifted from the center in the front-rear direction of the second member (71). The ridges (80) extending in the length direction are integrally formed. Thereby, the cross-sectional shape of the external shape of the second member (71) is asymmetric in the front-rear direction. The cross-sectional shape of the outer shape of the second member (71) excluding the ridges (80) is symmetric in the longitudinal direction.

  The second member (71) is formed by extruding both the front and rear walls (77), the partition wall (78), the connecting wall (79) and the ridges (80), and then cutting the partition wall (78) to project. (78a) and notches (78b).

  Each cap (72) is formed from an aluminum brazing sheet by pressing, forging or cutting. On the front side of each cap (72), a leftward and rightward projecting portion (81) that is fitted into the refrigerant inflow header portion (9) is integrally formed, and on the rear side, the refrigerant outflow header portion ( 11) A projecting portion (82) inward in the left-right direction that is fitted into the inside is integrally formed. In addition, an engaging claw (83) projecting inward in the left-right direction is integrally formed on the arc-shaped portion between the front and rear side edges and the lower edge of each cap (72), and is also formed on the upper edge in the left-right direction. A plurality of engaging claws (84) projecting inward are integrally formed at intervals in the front-rear direction.

  The first and second members (70), (71) of the refrigerant turn header tank (3) and the caps (72) are brazed as follows. The first and second members (70) and (71) are drooped before and after the first member (70) when the projection (78a) of the second member (71) is inserted into the through hole (76) and caulked. With the lower end of the wall (70a) and the upper end of both front and rear walls (77) of the second member (71) engaged, the brazing material layer of the first member (70) is used to braze each other. It is attached. Both caps (72) have front protrusions (81) in the space in front of the partition walls (78) of both members (70) (71), and rear protrusions (82) have both members (70 ) (71) are respectively fitted into the spaces behind the partition wall (78), and the upper engaging claw (84) is engaged with the first member (70), so that the lower engaging claw is engaged. With the (83) engaged with the front and rear walls (77) of the second member (71), the first and second members (70), (71) are utilized using the brazing material layer of each cap (72). ) Is brazed. Thus, the refrigerant turn header tank (3) is formed, the front side of the partition wall (78) of the second member (71) is the refrigerant inflow header portion (9), and the rear side of the partition wall (78) is the same. It is a refrigerant outflow header (11). The upper end opening of the notch (78b) of the partition wall (78) of the second member (71) is closed by the first member (70), thereby forming a refrigerant passage hole (85).

  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 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 header tank (2), and the brazing material layer of the first member (16) is used. The lower end of the first member (16) is inserted into the pipe insertion hole (36) of the first member (70) of the refrigerant turn header tank (3) and the first member (70) The first member (70) is brazed using a brazing material 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).

  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.

  The corrugated fin (14) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plurality of the corrugated fins (14) are 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 (14) is shared by both the front and rear heat exchange tube group (13), and the width in the front and rear direction is the heat exchange tube (12) front edge of the front heat exchange tube group (13) and the rear heat exchange. The distance between the rear edge of the heat exchanger tube (12) of the tube group (13) is substantially equal. 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.

  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. 5, 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 through the refrigerant inlet (37) of the right cap (19) into the refrigerant inlet header section (5) of the refrigerant inlet / outlet tank (2) and divert to the front heat exchange pipe group (13). It flows into the refrigerant passages of all the heat exchange tubes (12).

  The refrigerant that has flowed into the refrigerant passages of all the heat exchange pipes (12) flows downward in the refrigerant passages and enters the refrigerant inflow header portion (9) of the refrigerant turn header tank (3). The refrigerant that has entered the refrigerant inflow header portion (9) enters the refrigerant outflow header portion (11) through the refrigerant passage hole (85) of the partition wall (78).

  The refrigerant that has entered the refrigerant outflow header (11) is divided and flows into the refrigerant passages of all the heat exchange pipes (12) in the rear heat exchange pipe group (13), and the flow direction is changed to change the refrigerant path. The air flows upward and enters the lower space (6b) of the refrigerant outlet header (6). Here, resistance is imparted to the refrigerant flow by the shunt resistor plate (29), so that the refrigerant outflow header (11) to all the heat exchange pipes (12) in the rear heat exchange pipe group (13). The flow is made uniform, and the flow from the refrigerant inlet header (5) to all the heat exchange tubes (12) in the front heat exchange tube group (13) is made more uniform. As a result, the refrigerant flow rate of all the heat exchange tubes (12) in both heat exchange tube groups (13) is made uniform.

  Next, the refrigerant enters the upper space (6a) of the refrigerant outlet header (6) through the refrigerant passage holes (31A) and (31B) of the shunt resistor plate (29), and enters the refrigerant outlet of the right cap (19) ( 38) and the refrigerant outlet (46) of the joint plate (21), and flows out to the refrigerant outlet pipe (8). Then, while the refrigerant flows through the refrigerant passage of the heat exchange pipe (12) of the front heat exchange pipe group (13) and the refrigerant passage of the heat exchange pipe (12) of the rear heat exchange pipe group (13), the ventilation gap Is exchanged 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 (14), and the condensed water flows down to the top surface (3a) of the refrigerant turn header tank (3). The condensed water flowing down to the top surface (3a) of the refrigerant turn header 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. Drops below the header tank (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 header tank (3) and the lower end of the corrugated fin (14) is prevented, and as a result, the evaporator ( The performance degradation of 1) is prevented.

  The evaporator (1) is manufactured as shown in FIG.

  First, the protrusions (27a) of the second member (17) are inserted into the through holes (25) of the first member (16) and caulked, whereby the rising walls (22a) before and after the first member (16) are formed. The first member (16) and the second member (17) are temporarily fixed in a state where the upper end portion is engaged with the lower end portions of the front and rear walls (26) of the second member (17). In addition, both caps (18) and (19), and the front protrusions (39) and (32) protrude into the space on the front side of the partition wall (27) in both members (16) and (17), and the upper protrusions on the rear side. The parts (41) and (33) are disposed in the space behind the partition wall (27) in both members (16) and (17) and above the shunting resistance plate (29), and the rear lower projection (42) (34) is inserted into the space behind the partition wall (17) and below the shunt resistor plate (29), and the upper engaging claws (43) (35) are inserted. By engaging the connecting wall (28) of the second member (17) and further engaging the lower engaging claws (44), (36) with the curved portion (22) of the first member (16), Both caps (18) and (19) are temporarily fixed to both members (16) and (17). Further, the upper bent portion (47) of the joint plate (21) 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 part (47) is engaged with the center part in the front-rear direction of the right cap (19) and the flat part (24) of the first member (16), and the engaging claw (48) is placed under the right cap (19). By engaging with the edge, the joint plate (21) is temporarily fixed to both the members (16) (17) and the right cap (19). Thus, the refrigerant inlet / outlet header tank temporary fixing body (90) is formed.

  On the other hand, by inserting the protrusion (78a) of the second member (71) into the through hole (76) and caulking, the lower end of the hanging wall (70a) before and after the first member (70) and the second member The first member (70) and the second member (71) are temporarily fixed in a state where the upper ends of both front and rear walls (77) of (71) are engaged. Further, the front protrusions (81) of both caps (72) are placed in the space on the front side of the partition wall (78) in both members (70) (71), and the rear protrusions (82) are both members ( 70) and (71) are respectively fitted into the spaces behind the partition wall (78), the upper engaging claws (84) are engaged with the first member (70), and the lower engaging claws ( 83) is engaged with both front and rear walls (77) of the second member (71) to temporarily fix both caps (72) to the first and second members (70) (71). In this way, the refrigerant turn header tank temporary fixing body (91) is formed.

  Next, on the bed (100), a plurality of heat exchange tubes (12) and corrugated fins (14) are alternately arranged, and side plates (15) are arranged outside the corrugated fins (14) at both ends. Thus, the heat exchange core part combination (92) is formed.

  Next, the refrigerant inlet / outlet header tank temporary fixing body (90) and the refrigerant turn header tank temporary fixing body (91) are arranged on both sides of the heat exchange core assembly (92), and the refrigerant inlet / outlet header tank temporary fixing body is arranged. (90) and the refrigerant turn header tank temporary fixing body (91) are moved close to the heat exchange core assembly (92) by means of a freely movable jig (93) (94), and both ends of the heat exchange pipe (12) The portion is inserted into the tube insertion holes (23) and (75) of the first members (16) and (70). Each jig (93) (94) is formed with a recess (93a) (94a) into which the outer portion of each tank temporary fixing body (90) (91) fits. Further, concave grooves (95) and (96) into which the ridges (30) and (80) are fitted are formed on the inner peripheral surfaces of the concave portions (93a) and (94a) of the jigs (93) and (94).

  Thereafter, the temporary fixing bodies (90) and (91) for both tanks and the heat exchange core portion combination body (92) are temporarily fixed with an appropriate jig, and all the constituent members are brazed together. Thus, the evaporator (1) is manufactured.

  In the above embodiment, the ridge (80) is formed on the outer surface of the second member (71) of the refrigerant turn header tank (3). However, as in this embodiment, the refrigerant turn header tank (3 The refrigerant inflow header portion (9) and the refrigerant outflow header portion (11) have the same configuration, and the plurality of refrigerant passage holes (85) in the left half formed in the partition wall (78) and the right half If the positions of the plurality of refrigerant passage holes (85) are bilaterally symmetric, there is no problem even if the refrigerant turn header tank (3) is arranged in the left and right direction, so the ridge (80) is necessarily required. And not.

  In the above-described embodiment, the second members (17) and (71) constituting the outer portions of the header tanks (2) and (3) are formed of an aluminum extruded shape, but other types of evaporators and In other heat exchangers, such as condensers, the entire header tank may be formed of an extruded profile.

  Further, in the above embodiment, between the refrigerant inlet header portion (5) and the refrigerant inflow header portion (9) of both header tanks (2) (3), and between the refrigerant outlet header portion (6) and the refrigerant outflow header portion. (11) is provided with one heat exchange tube group (13), but the present invention is not limited to this, and the refrigerant inlet header portion (5) of both header tanks (2) (3) and the refrigerant One or two or more heat exchange pipe groups (13) may be provided between the inflow header section (9) and between the refrigerant outlet header section (6) and the refrigerant outflow header section (11). . In the above embodiment, the refrigerant inlet / outlet header tank (2) is on the upper side and the refrigerant turn header tank (3) is on the lower side. There is a case where the refrigerant turn header tank (3) is used so as to come up.

  Moreover, in the said embodiment, although the heat exchanger by this invention is applied to the evaporator, it is not limited to this, It can apply also to other various heat exchangers, for example, a condenser.

Furthermore, a heat exchanger according to the present invention includes a compressor, a gas cooler, an intermediate heat exchanger, an expansion valve, an evaporator, and a vehicle equipped with a car air conditioner that uses a CO ₂ refrigerant, for example, a car. Sometimes used as an evaporator.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which the present invention is applied. It is the II-II line expanded sectional view of Drawing 1 which omitted some. It is a disassembled perspective view of the header tank for refrigerant | coolant in / out. It is a disassembled perspective view of the header tank for refrigerant | coolant turns. It is a figure which shows how the refrigerant | coolant flows in the evaporator shown in FIG. It is a figure which shows a part of manufacturing process of the evaporator shown in FIG.

(1): Evaporator
(2): Header tank for refrigerant entry / exit
(3): Header tank for refrigerant turn
(4): Heat exchange core
(5): Refrigerant inlet header
(6): Refrigerant outlet header
(6a): Upper space
(6b): Lower space
(9): Refrigerant inflow header
(11): Refrigerant outflow header
(12): Heat exchange pipe
(16): First member
(17): Second member
(27): Partition wall
(30): ridge
(29): Shunt resistor plate
(31A) (31B): Refrigerant passage hole
(70): First member
(71): Second member
(78): Partition wall
(90): Header tank temporary stopper for refrigerant entry / exit
(91): Temporary stop for header tank for refrigerant turn
(93) (94): Jig
(93a) (94a): Recess
(95) (96): Groove

Claims (2)

The first and second header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged in parallel between the header tanks and having both ends connected to the header tanks. In addition, a refrigerant inlet header portion and a refrigerant outlet header portion are provided by dividing the inside of the first header tank forward and backward by the partitioning means, and two parts are provided by dividing the inside of the second header tank forward and backward by the partitioning means. An intermediate header portion is provided, and a plurality of heat exchange tubes are arranged in parallel between the refrigerant inlet header portion and one intermediate header portion, and both end portions thereof are respectively connected to both header portions, and the refrigerant outlet header portion, A plurality of heat exchange tubes are arranged in parallel with the other intermediate header portion, and both end portions thereof are respectively connected to both header portions, and the cross-sectional shape of the outer shape of at least one of the header tanks Each header tank is composed of a first member to which a heat exchange pipe is connected and a second member made of an extruded shape member brazed to a portion of the first member opposite to the heat exchange pipe. In the outer surface of the second member of the first header tank, a convex line extending in the length direction is integrally formed at a position deviated from the front and rear center, and the outer shape of the second member has a transverse cross-sectional shape excluding the convex line. The refrigerant outlet header is partitioned into two spaces by the partitioning means, and the heat exchange pipe is connected to the refrigerant outlet header so as to face one of the spaces, and a refrigerant passage hole is formed in the partitioning means. A heat exchanger in which the partitioning means and the partitioning means are integrally formed with the second member . The heat exchanger according to claim 1, wherein the first member comprises a brazing sheet having a brazing filler metal layer on at least one side .

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