JP2007093025A - Heat exchanger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of having pressure-proof strength of a header tank with desired magnitude. <P>SOLUTION: In this method for manufacturing the heat exchanger, the header tank 2 is constituted by stacking and brazing a header part forming plate 8, a pipe connecting plate 9 and an intermediate plate 10 with each another. The header part forming plate 8 is formed by a brazing sheet having a brazing material layer on both surfaces. At least one of outer side expansion parts 12A to 12D extending to the longitudinal direction and having an aperture closed by the intermediate plate 10 is formed on the header part forming plate 8. The pipe connecting plate 9 is formed by the brazing sheet having the brazing material layer on both surfaces. The intermediate plate 10 is formed by a metal bare material having no brazing material layer. A brazing material flow acceleration groove 50 is formed on both surfaces of the intermediate plate 10, and all of the plates 8, 9 and 10 are laminated and brazed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a heat exchanger, and more particularly, to a heat exchanger suitably used for an evaporator or a gas cooler of a supercritical refrigeration cycle using a supercritical refrigerant such as CO ₂ (carbon dioxide), and a manufacturing method thereof.

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum. Further, in this specification and claims, the “supercritical refrigeration cycle” means a refrigeration cycle in which the refrigerant is in a supercritical state exceeding the critical pressure on the high-pressure side. The term “refrigerant” means a refrigerant used in a supercritical refrigeration cycle.

  As a heat exchanger used in a supercritical refrigeration cycle, a pair of header tanks spaced apart from each other and a parallel arrangement with a gap between both header tanks and both ends connected to both header tanks Each of the header tanks includes a header portion forming plate, a pipe connecting plate, and a fin that is disposed in a ventilation gap between adjacent heat exchange tubes and brazed to the heat exchange tubes. The intermediate plate interposed between the two plates is laminated and brazed to each other, and end caps are brazed to both ends of these plates. In addition, a U-shaped cross section is formed over the entire length, and both end openings of the flow section are closed by end caps, so that the outward expansion of the pipe connection plate A plurality of tube insertion holes are formed in the portion corresponding to the portion in a penetrating manner at intervals in the length direction of the tube connection plate, and each tube insertion hole of the tube connection plate is formed in the intermediate plate for the header portion formation A communication hole communicating with the outward bulging portion of the plate is formed in a penetrating manner, and both end portions of the heat exchange pipe are inserted into the pipe insertion holes of the pipe connection plates of both header tanks and brazed to the header tank. A heat exchanger is known (see Patent Document 1, paragraphs 0067 to 0072, FIGS. 13 and 14).

By the way, in the heat exchanger of patent document 1, since the brazing of two adjacent plates which comprise a header tank is a surface brazing state, the following problems arise. In other words, in order to obtain the required brazing strength by brazing the two plates normally in the face brazed state, it is necessary to bring the plates into close contact with each other at the stage before brazing, but the work is troublesome. become. If there is a gap between the plates in the stage before brazing, the brazing material may be cut off at that portion after brazing, and a sufficient fillet may not be formed.
JP 2003-314987 A

  An object of the present invention is to solve the above problems and provide a heat exchanger including a header tank having a desired pressure resistance and a method for manufacturing the same.

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

1) A pair of header tanks spaced apart from each other and having a refrigerant distribution section, and a distance between the header tanks in the length direction of the header tank, and both end portions of each header tank A plurality of heat exchange pipes connected so as to communicate with the refrigerant circulation part, and each header tank is a heat exchanger configured by laminating a plurality of plates and brazing each other. ,
One of the two adjacent plates of all the plates constituting the header tank is made of a metal bare material, and the other is made of a brazing sheet having a brazing material layer on the surface facing the metal bearer plate, A heat exchanger in which a plurality of brazing material flow propulsion grooves are formed on the surface of the metal bearer plate facing the brazing sheet plate, and these two plates are brazed by the brazing material layer of the brazing sheet .

  2) Each header tank is composed of a header part forming plate, a pipe connecting plate, and an intermediate plate interposed between the two plates, which are laminated and brazed to each other. The plate is formed with at least one outward bulging portion extending in the length direction and closed by the intermediate plate, and the inside of the outward bulging portion serves as a refrigerant circulation portion. The plate is made of a brazing sheet having a brazing material layer on at least the surface on the intermediate plate side, the pipe connecting plate is made of a brazing sheet having a brazing material layer on both sides, and the intermediate plate is a metal bearing having no brazing material layer. The heat exchanger according to 1) above, which is made of a material and has a plurality of brazing material flow propulsion grooves formed on both surfaces of the intermediate plate.

  3) A plurality of tube insertion holes are formed in the portion corresponding to the outward bulging portion of the tube connection plate in a penetrating manner with an interval in the length direction of the tube connection plate. A communication hole that allows each pipe insertion hole of the plate to pass through the outward bulging part of the header part forming plate is formed in a penetrating manner, and both ends of the heat exchange pipe are in the pipe insertion hole of the pipe connection plate of both header tanks. The heat exchanger as described in 2) above, which is inserted into the pipe and brazed to the pipe connecting plate.

  4) The heat exchanger according to any one of the above 1) to 3), wherein the groove for propelling the brazing filler metal flow is formed so as to extend in the length direction of the metal bare plate and to be parallel to each other. .

  5) Two types of brazing material flow propulsion grooves having different inclination directions with respect to the length direction of the metal bearer plate are formed in a cross shape so that the same inclination directions are parallel to each other. The heat exchanger according to any one of 1) to 3).

  6) The heat exchanger according to any one of 1) to 5) above, wherein the brazing material flow propulsion groove is a triangular groove.

  7) The heat exchanger according to any one of 1) to 5) above, wherein the brazing material flow propulsion groove is a square groove.

  8) The heat exchanger according to any one of 1) to 5) above, wherein the brazing material flow propulsion groove is a round groove.

  9) The heat exchanger according to any one of 1) to 8) above, wherein the opening width of the groove for propelling brazing material flow is 0.2 to 0.8 mm, and the depth is also 0.1 to 0.5 mm. .

  10) The heat exchanger according to any one of 1) to 9) above, wherein the metal bear material is an aluminum bear material and the brazing sheet is an aluminum brazing sheet.

11) A pair of header tanks that are spaced apart from each other and that have a refrigerant distribution section, and are disposed between the header tanks in the length direction of the header tank, and both end portions are respectively connected to the header tanks. A method of manufacturing a heat exchanger comprising a plurality of heat exchange pipes connected so as to communicate with the refrigerant circulation section, and each header tank being constructed by laminating a plurality of plates and brazing each other Because
One of the two adjacent plates in the header tank is formed of a metal bare material, and the other is formed of a brazing sheet having a brazing material layer on the surface facing the metal bearer plate. Manufacturing of a heat exchanger including forming a plurality of brazing material flow propulsion grooves on the surface of the metal bearer plate facing the brazing sheet plate and laminating and brazing all the plates. Method.

12) A pair of header tanks spaced apart from each other and having a refrigerant distribution section, and a distance between the header tanks in the length direction of the header tank, and both end portions of the header tanks A plurality of heat exchange pipes connected so as to communicate with the refrigerant circulation part, and each header tank includes a header part forming plate, a pipe connection plate, and an intermediate plate interposed between the two plates. A heat exchanger constructed by being laminated and brazed together,
The header portion forming plate is formed of a brazing sheet having a brazing material layer on at least the surface on the intermediate plate side, and the header portion forming plate extends in the length direction thereof and has at least one opening closed by the intermediate plate. An outward bulge is formed, the pipe connecting plate is formed of a brazing sheet having a brazing filler metal layer on both sides, and the intermediate plate is formed of a metal bare material having no brazing filler metal layer on both sides of the intermediate plate. A method for manufacturing a heat exchanger, comprising forming a plurality of brazing material flow propulsion grooves and laminating and brazing all the plates.

  13) A plurality of tube insertion holes are formed in the portion corresponding to the outward bulging portion of the tube connection plate in a penetrating manner in the length direction of the tube connection plate, and the tube is connected to the intermediate plate. The hole for connecting each pipe insertion hole of the plate to the outward bulging part of the header forming plate is formed in a penetrating shape, and both ends of the heat exchange pipe are in the pipe insertion holes of the pipe connecting plates for both header tanks. The method for producing a heat exchanger as described in 12) above, which comprises inserting, brazing all the plates, and simultaneously brazing the heat exchange pipe and the pipe connecting plate.

  14) Manufacturing the heat exchanger according to any one of the above 11) to 13), wherein the groove for propelling the brazing filler metal flow is formed so as to extend in the length direction of the metal bare plate and to be parallel to each other. Method.

  15) The two types of brazing filler metal flow grooves with different inclination directions with respect to the length direction of the metal bare plate are formed in a cross shape and the same inclination directions are parallel to each other 11) ˜13) A method for producing a heat exchanger according to any one of the above.

  16) The method for producing a heat exchanger according to any one of 11) to 15) above, wherein the brazing material flow propulsion groove is a triangular groove.

17) The method for producing a heat exchanger according to any one of 11) to 15) above, wherein the brazing material flow propulsion groove is a square groove.

  18) The method for producing a heat exchanger according to any one of 11) to 15) above, wherein the brazing material flow propulsion groove is a round groove.

  19) The heat exchanger according to any one of 11) to 18) above, wherein the opening width of the groove for propelling the brazing filler metal is 0.2 to 0.8 mm, and the depth is also 0.1 to 0.5 mm. .

  20) The method for producing a heat exchanger according to any one of 11) to 19) above, wherein the metal bear material is an aluminum bear material and the brazing sheet is an aluminum brazing sheet.

  21) A refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant, A supercritical refrigeration cycle in which the evaporator comprises the heat exchanger according to any one of 1) to 10) above.

  22) a refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant, A supercritical refrigeration cycle, wherein the gas cooler comprises the heat exchanger according to any one of 1) to 10) above.

  23) The supercritical refrigeration cycle according to 21) or 22) above, wherein the supercritical refrigerant is carbon dioxide.

  24) A vehicle on which the supercritical refrigeration cycle according to any one of 21) to 23) is mounted as a car air conditioner.

  According to the heat exchanger of 1) above, when brazing between the adjacent metal bare plate and brazing sheet plate in all the plates constituting the header tank, the molten brazing material moves in the brazing material flow propulsion groove. It flows and spreads across the entire plate. Therefore, it is possible to prevent the occurrence of a piece of brazing material between the two plates, and after brazing, both plates are brazed together to obtain the necessary brazing strength, and the header tank has a desired strength against pressure. Can be

  According to the heat exchanger of the above 2), when the three plates constituting the header tank are brazed, the molten brazing material flows in the brazing material flow propulsion groove of the intermediate plate, and the intermediate plate and the header portion forming plate. And the whole between the pipe connection plate. Therefore, it is possible to prevent the brazing material from being cut between the intermediate plate and the header forming plate and the pipe connecting plate. After brazing, both plates are brazed together so that the required brazing strength is achieved. Thus, the pressure resistance of the header tank can be set to a desired size.

  According to the heat exchanger of 4) above, the joining length between the plates becomes longer in the plate length direction, and the pressure resistance strength in the plate stacking direction when the refrigerant flows in the refrigerant circulation portion is increased.

  According to the heat exchanger of 5) above, a high bonding strength can be obtained even in a portion where the bonding area between the plates is small. For example, when the communication holes are formed in the intermediate plate as in the heat exchanger of 3) above, the joining area between the header portion forming plate and the pipe connection plate at the portion between the adjacent communication holes However, even in this case, a large bonding strength is obtained, and the pressure strength in the plate stacking direction is increased.

  According to the heat exchanger of 6) above, the brazing material flow propulsion groove can be formed relatively easily.

  According to the heat exchanger of the above 7), the amount of brazing material flowing into the brazing material flow propulsion groove is relatively large, and a stable joined state can be obtained.

  According to the heat exchanger of the above 8), the flow of the brazing filler metal in the groove for propelling the brazing filler metal flow becomes relatively smooth and easily spreads between the two plates, and a stable joined state is obtained.

  According to the heat exchanger of 9) above, the effects described in 1) and 2) are ensured.

  According to the heat exchanger manufacturing method of 11) above, when brazing the adjacent metal bare plate and brazing sheet plate in all the plates constituting the header tank, the molten brazing material is used for brazing material flow propulsion. It flows in the groove and reaches the entire space between both plates. Therefore, it is possible to prevent the occurrence of a piece of brazing material between the two plates, and after brazing, both plates are brazed together to obtain the necessary brazing strength, and the header tank has a desired strength against pressure. Can be

  According to the method for producing a heat exchanger of the above 12), when the three plates constituting the header tank are brazed, the molten brazing material flows in the groove for propelling the brazing material flow of the intermediate plate, and the intermediate plate and the header portion Spread all the way between the forming plate and the pipe connection plate. Therefore, it is possible to prevent the brazing material from being cut between the intermediate plate and the header forming plate and the pipe connecting plate. After brazing, both plates are brazed together so that the required brazing strength is achieved. Thus, the pressure resistance of the header tank can be set to a desired size.

  According to the heat exchanger manufacturing method of 14), the same effects as in 4) above can be obtained.

  According to the heat exchanger manufacturing method of the above 15), the same effects as those of the above 5) are obtained.

  According to the method for producing a heat exchanger of 16), the same effect as in 6) is obtained.

  According to the heat exchanger manufacturing method of the above 17), the same effect as the above 7) is obtained.

  According to the heat exchanger manufacturing method of the above 18), the same effects as in the above 8) can be obtained.

  According to the heat exchanger manufacturing method of the above 19), the effects described in the above 11) and 12) are ensured.

  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 supercritical refrigeration cycle.

  In the following description, the upper and lower sides and the left and right sides in FIGS. Further, 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 10) is the front, and the opposite side is the rear.

  1 to 3 show the overall structure of an evaporator to which the present invention is applied, FIGS. 4 to 6 show the structure of the main part of the evaporator, and FIGS. 7 to 9 show a method for manufacturing the evaporator. FIG. 10 shows the flow of refrigerant in the evaporator shown in FIG.

1 to 3, an evaporator (1) of a supercritical refrigeration cycle that uses a supercritical refrigerant, for example, CO ₂ , is arranged with two header tanks (2) (2) ( 3) and a plurality of flat heat exchange pipes (4) arranged in parallel in the left-right direction between both header tanks (2) and (3), and adjacent heat exchange pipes (4) Between the left and right heat exchange pipes (4) and the corrugated fins (5) brazed to the heat exchange pipes (4) and the left and right ends of the corrugated fins (5) And an aluminum bear-made side plate (6) brazed to the corrugated fin (5).

  The upper header tank (2) is formed of a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and on the both sides of the header portion forming plate (8) arranged on the outer side in the vertical direction, that is, on the upper side. A brazing sheet having a brazing material layer, here formed from an aluminum brazing sheet and arranged in the vertical direction inside, i.e., the lower side, a pipe connecting plate (9) and a metal bare material, here made of an aluminum bear material and An intermediate plate (10) interposed between the header portion forming plate (8) and the pipe connecting plate (9) is laminated and brazed to each other.

  Two outward bulges (12A) (12B) (12C) (12D) extending in the left-right direction on the right and left sides of the header forming plate (8) of the upper header tank (2) Are formed at intervals. Hereinafter, in this embodiment, the outer bulging portion (12A) of the right front portion is the first outer bulging portion, the outer bulging portion (12B) of the right rear portion is the second outer bulging portion, and the left side. The outward bulge portion (12C) in the front portion is referred to as a third outward bulge portion, and the outward bulge portion (12D) in the rear left portion is referred to as a fourth outward bulge portion. The openings facing the lower sides of the outward bulging portions (12A) to (12D) are closed by the intermediate plate (10). The bulge height, length, and width of each of the outward bulge portions (12A) to (12D) are equal. And the inside of each outward bulge part (12A)-(12D) becomes the refrigerant | coolant distribution | circulation part by which both ends were closed. The header portion forming plate (8) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The pipe connection plate (9) of the upper header tank (2) consists of the inner surface in the vertical direction of the intermediate plate (10), here the lower surface covering part (13) covering the lower surface, and both front and rear edges of the lower surface covering part (13) Are integrally formed so as to protrude upward, and the front end reaches the outer surface of the header forming plate (8) to cover the front and rear side surfaces of the header forming plate (8) and the intermediate plate (10) over the entire height. It consists of a side surface covering part (14). The lower surface covering portion (13) is brazed to the lower surface of the intermediate plate (10), and the side surface covering portion (14) is brazed to the front and rear side surfaces of the header portion forming plate (8) and the intermediate plate (10). . A plurality of engaging portions (16) that engage with the outer surface of the header portion forming plate (8) are integrally formed at the upper end of each side surface covering portion (14) at intervals in the left-right direction. It is brazed to the plate (8).

  A plurality of penetrating pipe insertion holes (15) that are long in the front-rear direction are spaced apart in the left-right direction on both front and rear sides of the lower surface covering (13) of the pipe connection plate (9) of the upper header tank (2). Formed. The plurality of tube insertion holes (15) in the right half of the front side are formed within the left and right range of the first outward bulge portion (12A) of the header forming plate (8), and the right half of the rear side The plurality of tube insertion holes (15) in the first portion are formed in the left-right range of the second outwardly bulging portion (12B), and the plurality of tube insertion holes (15) in the front left half are the third A plurality of tube insertion holes (15) in the left half of the rear bulge (12C) are formed in the lateral direction of the outer bulge (12C). Is formed inside. In addition, the length of each tube insertion hole (15) is slightly longer than the width in the front-rear direction of each outward bulge (12A) to (12D), and both front and rear ends of the tube insertion hole (15) are It protrudes outward from the front and rear side edges of the side bulging portions (12A) to (12D) (see FIG. 3). The pipe connection plate (9) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  Place the pipe insertion hole (15) of the pipe connection plate (9) at the position corresponding to the pipe insertion hole (15) of the intermediate plate (10) of the upper header tank (2) outside the header section forming plate (8). The same number of penetrating communication holes (17) that communicate with the side bulging portions (12A) to (12D) are formed as many as the tube insertion holes (15). The communication hole (17) is slightly larger than the pipe insertion hole (15). The plurality of tube insertion holes (15) in the right half on the front side of the pipe connection plate (9) are first connected via the plurality of communication holes (17) in the right half on the front side of the intermediate plate (10). The plurality of tube insertion holes (15) in the right half of the rear side are also connected to the plurality of communication holes (in the right half of the rear side of the intermediate plate (10)). 17) through the second outwardly bulging portion (12B) through the tube, and a plurality of tube insertion holes (15) in the front left half are also formed in the front left half of the intermediate plate (10). The plurality of tube insertion holes (15) in the left half of the rear side are connected to the third outer bulge portion (12C) through the plurality of communication holes (17). It is made to communicate in the 4th outward bulge part (12D) via a plurality of communicating holes (17) in the left half of the rear side.

  In the intermediate plate (10), each communication hole (17) that communicates with the third outer bulge portion (12C) and each communication hole (17) that communicates with the fourth outer bulge portion (12D) include the intermediate plate (10 ) In the third outer bulging portion (12C) by communicating with the refrigerant turn communication portion (18) formed by cutting out the portion between the communication holes (17) adjacent in the front-rear direction. The inside of the fourth outward bulge portion (12D) communicates with each other (see FIG. 4). All the communication holes (17) leading into the first outer bulge portion (12A) and all the communication holes (17) leading into the second outer bulge portion (12B) are respectively in the intermediate plate (10). It is connected by the communication part (19) formed by excising the part between the communication holes (17) adjacent to the left-right direction (refer FIG. 4). The intermediate plate (10) is formed by pressing an aluminum bare material.

  Although not shown in FIGS. 2 and 3, grooves for propelling brazing material flow are formed over the entire upper and lower surfaces of the intermediate plate (10), and the brazing material flow on the upper surface of the intermediate plate (10). The interior of the entire propulsion groove is filled with a brazing material that has melted and then solidified from the header forming plate (8) during brazing. Therefore, the upper surface of the intermediate plate (10) and the lower surface of the header portion forming plate (8) are brazed to the entire surface without causing a brazing material cut portion. In addition, the entire inside of the groove for propelling the brazing material flow on the lower surface of the intermediate plate (10) is filled with the brazing material that has melted and then solidified from the pipe connecting plate (9) during brazing. Therefore, the lower surface of the intermediate plate (10) and the upper surface of the pipe connecting plate (9) are brazed to the entire surface without causing a brazing material cut portion.

  As shown in FIGS. 4 and 5, two right protrusions (8a), (9a), (10a) are provided at the right ends of the three plates (8), (9), (10) at intervals in the front-rear direction. ) Is formed. The intermediate plate (10) has a notch (21A) (21B) that leads from the tip of the two front and rear outward projections (10a) to the communication hole (17) at the right end. In (2), a refrigerant inlet (22) communicating with the first outer bulging portion (12A) and a refrigerant outlet (23) communicating with the second outer bulging portion (12B) are formed. A refrigerant inflow passage (25) and a refrigerant outlet (25) leading to the refrigerant inlet (22) so as to straddle the two right protrusions (8a) (9a) (10a) of the three plates (8) (9) (10). 23) A refrigerant inlet / outlet member (24) having a refrigerant outflow path (26) leading to 23) is brazed to the upper header tank (2) by a brazing sheet having a brazing material layer on both sides, here an aluminum brazing sheet (27). Yes. The refrigerant inlet / outlet member (24) is made of a metal bare material, here an aluminum bear material.

  As shown in FIGS. 2 and 3, the lower header tank (3) is formed of a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and is disposed on the outer side in the vertical direction, that is, on the lower side. A header portion forming plate (31), a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and a pipe connecting plate (32) disposed on the inner side in the vertical direction, that is, on the upper side, and a metal An intermediate plate (33) made of a bare material, here an aluminum bare material, and interposed between the header forming plate (31) and the pipe connecting plate (32) is laminated and brazed to each other. Is configured.

  On the header forming plate (31) of the lower header tank (3), two outward bulging portions (34A) and (34B) extending in the left-right direction are connected to the first outward bulging portion (12A) and the third Header portion forming plate spaced in the front-rear direction so as to straddle the outer bulge portion (12C) and the second outer bulge portion (12B) and the fourth outer bulge portion (12D). It is formed from the right end to the left end of (31). The bulge height, length, and width of each outward bulge portion (34A) (34D) are equal. Here, the inside of each outward bulge part (34A) (34B) is a refrigerant circulation part with both ends closed. The header portion forming plate (31) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The pipe connection plate (32) of the lower header tank (3) includes the upper surface in the vertical direction of the intermediate plate (33), here the upper surface covering portion (35) covering the upper surface, and both the front and rear sides of the upper surface covering portion (35). It is integrally formed on the edge so as to protrude downward, and the tip reaches the outer surface of the header forming plate (31), and the front and rear side surfaces of the header forming plate (31) and the intermediate plate (33) extend over the entire height. It consists of the side surface covering part (36) to cover. The upper surface covering portion (35) is brazed to the upper surface of the intermediate plate (33), and the side surface covering portion (36) is brazed to both the front and rear side surfaces of the header portion forming plate (31) and the intermediate plate (33). . A plurality of engaging portions (37) that engage with the outer surface of the header portion forming plate (31) are integrally formed at the lower end of each side surface covering portion (36) at intervals in the left-right direction. It is brazed to the plate (31).

  A plurality of through-hole insertion holes (38) that are long in the front-rear direction are spaced apart in the left-right direction on both front and rear sides of the upper surface covering (35) of the pipe connection plate (32) of the lower header tank (3) Formed. The plurality of front-side tube insertion holes (38) are formed within the range in the left-right direction of the front outer bulging portion (34A) of the header portion forming plate (31), and the plurality of rear-side tube insertion holes (38 ) Is formed within the range in the left-right direction of the rear outward bulge portion (34B). The length of each tube insertion hole (38) is slightly longer than the width in the front-rear direction of each outward bulge (34A) (34B). It protrudes outward from the front and rear side edges of the bulging portions (34A) and (34B) (see FIGS. 3 and 6). The pipe connecting plate (32) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  A plurality of drainage guides (40) are formed on the pipe connection plate (32) at intervals in the left-right direction. In the illustrated example, the drainage guide (40) is formed between the heat exchange pipes (4) adjacent in the left-right direction and between the heat exchange pipes (4) and the side plates (6) at both left and right ends. However, the present invention is not limited to this, and it may be formed at the same position as the heat exchange tube (4) in the left-right direction. The drainage guide (40) is formed by cutting the pipe connecting plate (32) from the outer portion in the front-rear direction of the upper surface covering portion (35) to the upper portion of the both side surface covering portions (36) (41 ). A groove is formed by the cut portion (41) and the intermediate plate (33). The part present on the upper surface covering part (35) of the excision part (41) is tapered so that the tip is sharp toward the inside in the front-rear direction, and the part present on the side surface covering part (36) is the tip toward the lower side. The taper is tapered.

  At the position corresponding to the pipe insertion hole (38) in the intermediate plate (33), the pipe insertion hole (38) of the pipe connection plate (32) is connected to the outward bulging part (34A) of the header part forming plate (31). The same number of through-holes (42) communicating with (34B) as the tube insertion holes (38) are formed. The communication hole (42) is slightly larger than the pipe insertion hole (38). The plurality of tube insertion holes (38) on the front side of the pipe connection plate (32) are formed in the front outer bulge portion (34A) via the plurality of communication holes (42) on the front side of the intermediate plate (33). Similarly, the plurality of rear-side tube insertion holes (38) are inserted into the rear-side outward bulging portion (34B) via the plurality of rear-side communication holes (42) of the intermediate plate (33). It is made to communicate. In addition, all the communication holes (42) leading to the front outer bulge portion (34A) and all the communication holes (42) leading to the rear outer bulge portion (34B) in the intermediate plate (33) Each of the intermediate plates (33) is in communication with a communication portion (43) formed by cutting away a portion between the communication holes (42) adjacent in the left-right direction (see FIG. 6). The intermediate plate (33) is formed by pressing an aluminum bear material.

  Although not shown in FIGS. 2 to 3, grooves for propelling brazing material flow are formed on the entire upper and lower surfaces of the intermediate plate (33), and the brazing material flow on the upper surface of the intermediate plate (33). The interior of the entire propulsion groove is filled with a brazing material that has melted and then solidified from the pipe connection plate (32) during brazing. Therefore, the upper surface of the intermediate plate (33) and the lower surface of the pipe connecting plate (32) are brazed to the entire surface without causing a brazing material cut portion. In addition, the entire inside of the groove for propelling the brazing material flow on the lower surface of the intermediate plate (33) is filled with the brazing material that has melted and then solidified from the header forming plate (31) during brazing. The lower surface of the plate (33) and the upper surface of the header portion forming plate (31) are brazed to the entire surface without causing a brazing material cut portion.

  In the portion between the pipe insertion hole (38) and the communication hole (42) adjacent to each other in the lower header tank (3), the pipe connecting plate (32), the intermediate plate (33), and the header portion forming plate (31 ), A plurality of drain holes (44), (45) and (46) are formed in a penetrating manner so as to be spaced apart from each other in the left-right direction and to coincide with each other. Here, the drain holes (44) (45) (46) are located between the heat exchange pipes (4) adjacent in the left-right direction and between the heat exchange pipes (4) and the side plates (6) at the left and right ends. Is formed.

  The heat exchange pipe (4) is made of a bare metal material, here an aluminum extruded shape, and has a wide and flat shape in the front-rear direction, and a plurality of refrigerant passages (4a) extending in the length direction are arranged in parallel in the heat exchange pipe (4). (Refer to FIG. 4 and FIG. 6). Both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (15) and (38) of both header tanks (2) and (3), respectively. The material layer is brazed to the pipe connection plates (9) and (32). Note that both ends of the heat exchange pipe (4) enter the communication holes (17) and (42) up to the middle part in the thickness direction of the intermediate plates (10) and (33) (see FIG. 3). Between the header tanks (2) and (3), a heat exchange pipe group (4A) consisting of a plurality of heat exchange pipes (4) arranged in parallel at intervals in the left-right direction is arranged in the front-rear direction. A plurality of rows, here two rows are arranged. The upper and lower ends of the plurality of heat exchange tubes (4) located in the right half of the front heat exchange tube group (4A) are in the first outer bulge (12A) and in the front outer bulge (34A). Are connected to both header tanks (2) and (3) so that the upper and lower ends of the plurality of heat exchange tubes (4) located in the left half of the front heat exchange tube group (4A) are third outward. The header tanks (2) and (3) are connected to communicate with each other in the bulging portion (12C) and in the front outer bulging portion (34A). The upper and lower ends of the plurality of heat exchange tubes (4) located in the right half of the rear heat exchange tube group (4A) are in the second outer bulge portion (12B) and the rear outer bulge portion. (34B) both upper and lower ends of a plurality of heat exchange tubes (4) connected to both header tanks (2) and (3) so as to communicate with each other and located in the left half of the rear heat exchange tube group (4A) Is connected to both header tanks (2) and (3) so as to communicate with the fourth outer bulging portion (12D) and the rear outer bulging portion (34B).

  The corrugated fin (5) is formed in a corrugated shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plurality of parallel portions in the front-rear direction are connected to a connecting portion that connects the wave head and the wave bottom. A louver is formed. The corrugated fin (5) is shared by both the front and rear heat exchange tube group (4A), and the width in the front and rear direction is the heat exchange tube (4A) of the front heat exchange tube group (4A) and the rear side heat exchange. The distance between the rear edge of the heat exchange tube (4) of the tube group (4A) is substantially equal. Instead of sharing one corrugated fin (5) between the front and rear heat exchange tube groups (4A), the corrugated fins are arranged between the adjacent heat exchange tubes (4) of the two heat exchange tube groups (4A). May be arranged.

  Next, a method for manufacturing the evaporator (1) will be described with reference to FIGS.

  As shown in FIGS. 7 and 8, first, an aluminum brazing sheet having a brazing filler metal layer on both sides is subjected to press working, whereby a right protrusion (8a) and outward bulges (12A) (12B) ( 12C) (12D) upper header tank (2) header section forming plate (8) and lower bulging section (34A) (34B) and lower header tank having drain holes (46) The header part forming plate (31) of (3) is formed. In addition, by pressing the aluminum brazing sheet having a brazing filler metal layer on both sides, the right protrusion (9a), the lower surface covering portion (13), the side surface covering portion (14), and the side surface covering portion (14) are straightened. Forming the pipe connecting plate (9) of the upper header tank (2) having the engaging part forming protrusion (16A) and the pipe insertion hole (15) connected to the upper surface covering part (35), side surface covering Lower header having a portion (36), an engaging portion forming protrusion (37A) straightly connected to the side surface covering portion (36), a tube insertion hole (38), a drainage guide (40) and a drainage hole (44) A pipe connection plate (32) for the tank (3) is formed. Further, by pressing the aluminum bear material, an upper header tank having a right protrusion (10a), a notch (21A) (21B), a communication hole (17), and a communication portion (18) (19) ( The intermediate plate (10) of 2) is formed, and the intermediate plate (33) of the lower header tank (3) having the communication hole (42), the communication part (43) and the drainage hole (45) is formed.

  The upper and lower surfaces of both intermediate plates (10) and (33) have a plurality of brazing material flow propulsion grooves (50) extending in the length direction (left and right direction) of the intermediate plates (10) and (33) and width. It forms over the whole surface so that it may become mutually parallel at intervals in the direction (front-back direction). The brazing material flow propulsion groove (50) includes a triangular groove (50A) having a substantially V-shaped cross section as shown in FIG. 9 (a), and a corner having a substantially rectangular cross section as shown in FIG. 9 (b). Either a groove (50B) or a round groove (50C) having a substantially U-shaped cross section as shown in FIG. In any of the grooves (50A) (50B) (50C), the opening width (W) is preferably 0.2 to 0.8 mm, and the depth (D) is preferably 0.1 to 0.5 mm. The reason is that the brazing material layer brazing material formed on the header portion forming plate (8) and the pipe connection plate (9) fills the brazing material flow propulsion groove (50A) (50B) (50C). This is because it has been found that it is preferable to set the opening width (W) and depth (D) as a result of the brazing experiment. Furthermore, it is preferable that the space | interval between the groove | channel (50) for brazing material flow promotion adjacent to front and back is 1.5-3.0 mm. The reason for this is the same as in the case of the opening width (W) and depth (D) of the groove (50A) (50B) (50C) for the brazing filler metal flow propulsion (8) and the pipe connection plate. This is because the brazing material layer formed in (9) is filled with the brazing material flow propulsion grooves (50A), (50B), and (50C). It was because it became clear.

  Next, the three plates (8), (9), (10), and (31), (32), and (33) are combined in a stacked manner so that the intermediate plates (10) and (33) are in the middle. At this time, the drain holes (44), (45), and (46) are made to coincide with each other for the three plates (31), (32), and (33) of the lower header tank (3). Next, the protrusions (16A) and (37A) are bent to form the engaging portions (16) and (37), and the engaging portions (16) and (37) are engaged with the header portion forming plates (8) and (31). Let's make a temporary stop.

  Next, the two temporary fixing bodies are arranged at intervals so that the pipe connecting plates (9) and (32) face each other. A plurality of heat exchange tubes (4) and corrugated fins (5) are alternately arranged. Then, both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (15) and (38) of the pipe connection plates (9) and (32) of the temporary fixing bodies, and the corrugated fins (5 ) Side plate (6) is placed outside, and the refrigerant inlet / outlet member (24) is placed through the brazing sheet (27) so as to straddle the three plates (8), (9) and (10). The member is fixed with an appropriate jig (not shown).

  After that, by heating all the members fixed by the jig to an appropriate temperature, the header portion forming plate (8) (31), the intermediate plate (10) (33), the pipe connecting plate (9) (32 ) Cover part (13) (35) and intermediate plate (10) (33), side cover part (14) (36) and intermediate plate (10) (33), header part forming plate (8) (31) Front and rear side surfaces, engaging part (16) (37) and header part forming plate (8) (31), heat exchange pipe (4) and pipe connection plate (9) (32), heat exchange pipe (4 ) And fin (5), and side plate (6) and fin (5) are brazed at the same time. Thus, the evaporator (1) is manufactured.

  At the time of manufacturing the evaporator (1) described above, the molten brazing material flows in the brazing material flow propulsion groove (50) of the intermediate plate (10) (33) to form the intermediate plate (10) (33) and the header portion. The whole area between the plate (8) (31) and the pipe connection plate (9) (32) is distributed. Therefore, it is possible to prevent the brazing material from being cut between the intermediate plate (10) (33) and the header portion forming plate (8) (31) and the pipe connecting plate (9) (32). Later, the intermediate plate (10) (33), the header forming plate (8) (31), and the pipe connection plate (9) (32) are brazed to the entire surface to obtain the required strength and manufacture. The pressure-resistant strength of the header tanks (2) and (3) of the evaporator (1) thus made can be set to a desired level.

The evaporator (1) constitutes a supercritical refrigeration cycle together with an intermediate heat exchanger that exchanges heat between the refrigerant coming out of the compressor, gas cooler, decompressor, gas-liquid separator and gas cooler and refrigerant coming out of the evaporator. The air conditioner is mounted on a vehicle such as an automobile. In the supercritical refrigeration cycle, CO ₂ , ethylene, ethane, nitric oxide or the like is used as a supercritical refrigerant.

In the evaporator (1) described above, as shown in FIG. 10, the CO ₂ that has been depressurized through the decompressor (expansion valve) passes through the refrigerant inflow passage (25) of the inlet / outlet member (24) and enters the refrigerant inlet ( 22) enters the first outer bulging portion (12A) of the upper header tank (2), flows to the left in the first outer bulging portion (12A), and enters the first outer bulging portion (12A). ) Flows into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the inside.

CO ₂ flows into the first outward bulging portion (12A) all the heat exchange tubes in communication with the inside (4) the refrigerant passage (4a) is lower flows through the refrigerant passage (4a) downward It flows into the front outward bulge portion (34A) of the header tank (3). The CO ₂ that has flowed into the front outward bulge (34A) flows to the left through the inside, and all the heat exchange pipes (divided and communicated with the third external bulge (12C)) It flows into the refrigerant passage (4a) of 4).

The CO _{2 that} has flowed into all the heat exchange pipes (4) communicating with the third outward bulging portion (12C) changes the flow direction and flows upward in the refrigerant passage (4a) to flow upward into the upper header tank. Enter into the third outward bulge (12C) of (2). The CO ₂ flowing into the third outer bulging portion (12C) passes through the refrigerant turn communicating portion (18) of the intermediate plate (10) of the upper header tank (2) to form the fourth outer bulging portion ( 12D), flows into the refrigerant passages (4a) of all the heat exchange pipes (4) connected to the fourth outer bulging portion (12D), changes the flow direction, and flows into the refrigerant passages. (4a) flows downward and enters the rear outward bulge (34B) of the lower header tank (3). The CO ₂ that has flowed into the rear outward bulge part (34B) flows to the right through the inside, and is divided into all the heat exchange tubes connected to the second outward bulge part (12B). It flows into the refrigerant passage (4a) of (4).

The CO _{2 that} has flowed into all the heat exchange pipes (4) communicating with the second outer bulging part (12B) changes the flow direction and flows upward in the refrigerant passage (4a) to flow upward into the upper header tank. Enter into the second outward bulge (12B) of (2). Thereafter, CO ₂ flows through the second outward bulging portion (12B), and flows out through the refrigerant outlet (23) and the refrigerant outflow path (26) of the inlet / outlet member (24). While the CO ₂ flows in the refrigerant passage (4a) of the heat exchange pipe (4), the air flow is exchanged with the air flowing in the direction indicated by the arrow X in FIGS. Leaked.

  At this time, condensed water is generated on the surface of the corrugated fin (5), and this condensed water flows down to the upper surface of the lower header tank (3). Condensed water that has flowed down to the upper surface of the lower header tank (3) enters the drainage guide (40), flows through the drainage guide (40), and is below the lower end of the portion that exists in the side surface covering portion (36). Drops below the header tank (3). Further, the condensed water flowing down to the upper surface of the lower header tank (3) falls below the lower header tank (3) through the drain holes (44) (45) (46).

  In this way, freezing of condensed water caused by accumulation of a large amount of condensed water between the upper surface of the lower header tank (3) and the lower end of the corrugated fin (5) is prevented, and as a result, the performance of the evaporator (1) is reduced. Is prevented.

  11 and 12 show modifications of the intermediate plates (10) and (33) used in the upper and lower header tanks (2) and (3).

  11 and 12, two types of brazing material flow propulsion grooves (55) having different inclination directions with respect to the length direction of the intermediate plates (10) (33) are formed on the upper and lower surfaces of the intermediate plates (10, 33). However, it is formed in a cross shape over the entire surface as viewed from above. The brazing material flow propulsion grooves (55) having the same inclination direction with respect to the length direction of the intermediate plates (10) (33) are parallel to each other with a space therebetween. Any of the triangular groove (50A), the square groove (50B), and the round groove (50C) shown in FIGS. 9 (a) to 9 (c) may be used as the brazing material flow propulsion groove (55).

  In the above embodiment, the heat exchanger according to the present invention is applied to an evaporator of a supercritical refrigeration cycle, but is not limited thereto, and may be applied to a gas cooler of a supercritical refrigeration cycle.

  Further, in the above embodiment, a plurality of brazing material flow propulsion grooves are formed on the entire upper and lower surfaces of the intermediate plates (10), (33) (metal bare plate), but the present invention is not limited to this. However, it may be formed only in a necessary part. That is, the plurality of brazing material flow propulsion grooves only need to be formed on at least a part of the upper and lower surfaces of the intermediate plates (10), (33) (metal bare plate).

It is a partially-omission perspective view which shows the whole structure of the evaporator to which the heat exchanger by this invention is applied. It is the vertical sectional view which left a part which looked forward from the back of the evaporator shown in FIG. It is the sectional view on the AA line of FIG. 2 which abbreviate | omitted one part. It is the BB expanded sectional view of FIG. 2 which abbreviate | omitted one part. It is a disassembled perspective view which shows the right end part of the upper header tank in the evaporator of FIG. It is the CC sectional view taken on the line of FIG. It is a disassembled perspective view which shows the manufacturing method of the upper side header tank of the evaporator of FIG. It is a disassembled perspective view which shows the manufacturing method of the lower header tank of the evaporator of FIG. It is a principal part expanded sectional view which shows the intermediate | middle plate of both the header tanks of the evaporator of FIG. It is a figure which shows the flow of the refrigerant | coolant in the evaporator of FIG. It is a perspective view which shows the modification of the intermediate | middle plate of an upper header tank. It is a perspective view which shows the modification of the intermediate | middle plate of a lower header tank.

Explanation of symbols

(1): Evaporator (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(8) (31): Header forming plate
(9) (32): Pipe connection plate
(10) (33): Intermediate plate
(12A) (12B) (12C) (12D) (34A) (34B): Outward bulge
(15) (38): Tube insertion hole
(17) (42): Communication part
(50) (50A) (50B) (50C) (55): Groove for brazing filler metal flow propulsion

Claims (24)

A pair of header tanks that are spaced apart from each other and that have a refrigerant circulation part, and are arranged in the length direction of the header tank between both header tanks, and refrigerant flows through both header tanks. A plurality of heat exchange tubes connected to communicate with each other, each header tank is a heat exchanger configured by laminating a plurality of plates and brazing each other,
One of the two adjacent plates of all the plates constituting the header tank is made of a metal bare material, and the other is made of a brazing sheet having a brazing material layer on the surface facing the metal bearer plate, A heat exchanger in which a plurality of brazing material flow propulsion grooves are formed on the surface of the metal bearer plate facing the brazing sheet plate, and these two plates are brazed by the brazing material layer of the brazing sheet . Each header tank is configured by laminating a header portion forming plate, a pipe connecting plate, and an intermediate plate interposed between the two plates and brazing each other. The at least one outward bulging portion extending in the length direction and closed by the intermediate plate is formed, the inside of the outward bulging portion is a refrigerant circulation portion, and the header portion forming plate is The brazing sheet having a brazing material layer on at least the surface on the intermediate plate side, the pipe connecting plate comprising a brazing sheet having a brazing material layer on both sides, and the intermediate plate comprising a metal bare material having no brazing material layer The heat exchanger according to claim 1, wherein a plurality of brazing material flow propulsion grooves are formed on both surfaces of the intermediate plate. A plurality of tube insertion holes are formed in the portion corresponding to the outward bulging portion of the tube connection plate in a penetrating manner with an interval in the length direction of the tube connection plate. A communication hole that allows each pipe insertion hole to pass through the outward bulging part of the header forming plate is formed in a through shape, and both ends of the heat exchange pipe are inserted into the pipe insertion holes of the pipe connecting plates of both header tanks. The heat exchanger according to claim 2, wherein the heat exchanger is brazed to the pipe connecting plate. The heat exchanger according to any one of claims 1 to 3, wherein the grooves for propelling the brazing filler metal flow are formed so as to extend in the length direction of the metal bearer plate and to be parallel to each other. 2. Two types of brazing material flow propulsion grooves having different inclination directions with respect to the length direction of the metal bare plate are formed in a cross shape so that the same inclination directions are parallel to each other. The heat exchanger in any one of -3. The heat exchanger according to any one of claims 1 to 5, wherein the brazing material flow propulsion groove is a triangular groove. The heat exchanger according to any one of claims 1 to 5, wherein the groove for brazing filler metal flow promotion is a square groove. The heat exchanger according to any one of claims 1 to 5, wherein the groove for propelling brazing material flow is a round groove. The heat exchanger according to any one of claims 1 to 8, wherein the opening width of the groove for brazing filler metal flow propulsion is 0.2 to 0.8 mm and the depth is 0.1 to 0.5 mm. The heat exchanger according to any one of claims 1 to 9, wherein the metal bare material is an aluminum bear material, and the brazing sheet is an aluminum brazing sheet. A pair of header tanks that are spaced apart from each other and that have a refrigerant circulation part, and are arranged in the length direction of the header tank between both header tanks, and refrigerant flows through both header tanks. A plurality of heat exchange tubes connected to communicate with each other, and each header tank is a method of manufacturing a heat exchanger configured by laminating a plurality of plates and brazing each other. And
One of the two adjacent plates in the header tank is formed of a metal bare material, and the other is formed of a brazing sheet having a brazing material layer on the surface facing the metal bearer plate. Manufacturing of a heat exchanger including forming a plurality of brazing material flow propulsion grooves on the surface of the metal bearer plate facing the brazing sheet plate and laminating and brazing all the plates. Method. A pair of header tanks that are spaced apart from each other and that have a refrigerant circulation part, and are arranged in the length direction of the header tank between both header tanks, and refrigerant flows through both header tanks. A plurality of heat exchange pipes connected to communicate with each other, and each header tank includes a header part forming plate, a pipe connecting plate, and an intermediate plate interposed between the two plates. A method of manufacturing a heat exchanger constructed by being laminated and brazed together,
The header portion forming plate is formed of a brazing sheet having a brazing material layer on at least the surface on the intermediate plate side, and the header portion forming plate extends in the length direction thereof and has at least one opening closed by the intermediate plate. An outward bulge is formed, the pipe connecting plate is formed of a brazing sheet having a brazing filler metal layer on both sides, and the intermediate plate is formed of a metal bare material having no brazing filler metal layer on both sides of the intermediate plate. A method for manufacturing a heat exchanger, comprising forming a plurality of brazing material flow propulsion grooves and laminating and brazing all the plates. A plurality of tube insertion holes are formed in the portion corresponding to the outward bulging portion of the tube connection plate in a penetrating manner at intervals in the length direction of the tube connection plate. A through hole is formed in each pipe insertion hole to let it go into the outward bulging part of the header forming plate, and both ends of the heat exchange pipe are inserted into the pipe insertion holes of the pipe connecting plates of both header tanks. 14. The method for manufacturing a heat exchanger according to claim 13, comprising brazing all the plates and brazing the heat exchange pipe and the pipe connecting plate at the same time. The method for manufacturing a heat exchanger according to any one of claims 11 to 13, wherein the grooves for propelling the brazing material flow are formed so as to extend in the length direction of the metal bearer plate and to be parallel to each other. 14. Two types of brazing material flow propulsion grooves having different inclination directions with respect to the length direction of the metal bare plate are formed in a cross shape so that the same inclination directions are parallel to each other. The manufacturing method of the heat exchanger in any one of these. The method for manufacturing a heat exchanger according to any one of claims 11 to 15, wherein the brazing material flow propulsion groove is a triangular groove. The method for manufacturing a heat exchanger according to any one of claims 11 to 15, wherein the brazing material flow propulsion groove is a square groove. The method for manufacturing a heat exchanger according to any one of claims 11 to 15, wherein the groove for propelling brazing material flow is a round groove. The heat exchanger according to any one of claims 11 to 18, wherein the opening width of the brazing material flow propulsion groove is 0.2 to 0.8 mm, and the depth is also 0.1 to 0.5 mm. The method for manufacturing a heat exchanger according to any one of claims 11 to 19, wherein the metal bare material is an aluminum bear material, and the brazing sheet is an aluminum brazing sheet. A refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant, A supercritical refrigeration cycle comprising the heat exchanger according to any one of claims 1 to 10. A refrigeration cycle comprising a compressor, a gas cooler, an evaporator, a decompressor and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator, and using a supercritical refrigerant, the gas cooler A supercritical refrigeration cycle comprising the heat exchanger according to any one of claims 1 to 10. The supercritical refrigeration cycle according to claim 21 or 22, wherein the supercritical refrigerant is carbon dioxide. A vehicle on which the supercritical refrigeration cycle according to any one of claims 21 to 23 is mounted as a car air conditioner.

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