JPWO2006129598A1 - Heat exchanger - Google Patents

Abstract

The header tanks 2 and 3 of the heat exchanger include header portion forming plates 8 and 31, pipe connecting plates 9 and 32, and intermediate plates 10 and 32 interposed between these plates 8, 9, 31, 32. It consists of 33. A plurality of outwardly bulging portions 12A, 12B, 34A, 34B are formed on the plates 10, 33. Through holes 28, 29, 30, 44, 45, 46 at positions where the three plates 8, 9, 10, 31, 32, 33 coincide with each other between the adjacent outwardly bulging portions 12A, 12B, 34A, 34B. Form. Flange portions 30a and 46a are integrally formed at the peripheral edge portions of the through holes 30 and 46 of the intermediate plates 10 and 33, respectively. Insert the flanges 30a and 46a into the through holes 18 and 44 of the plates 8 and 31 and expand the pipes, and further project the peripheral parts of the through holes 29 and 45 of the plates 9 and 32 toward the plates 10 and 33 to pass through the holes. By press-fitting into 30,46, the three plates 8,9,10,31,32,332 are caulked at the peripheries of the through holes 28,29,30,44,45,46, and in this state, they will be brazed together Attached. According to this heat exchanger, the pressure resistance of the header tank is improved.

Description

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

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum. In this specification and claims, the term “supercritical refrigeration cycle” means a refrigeration cycle in which the refrigerant enters a supercritical state exceeding the critical pressure on the high-pressure side, and “supercritical 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 The header tank has a plurality of fluid circulation portions extending in the length direction and extending in the width direction. The header tank has a fin disposed in the ventilation gap between adjacent heat exchange tubes and brazed to the heat exchange tube. A header portion forming plate formed at intervals, a tube connecting plate in which a plurality of tube insertion holes are formed penetrating in the length direction and the width direction, and the inside of the tube connection plate And a plurality of communication holes that are formed along the length of the pipe connection hole and are formed in a penetrating manner in the length direction. Are known Patent Document 1, see FIG. 15).

However, according to the header tank of the heat exchanger described in Patent Document 1, in the portion between the adjacent fluid circulation portions of the header portion forming plate, the header portion forming plate and the intermediate plate, and the pipe connecting plate and the intermediate plate There is a possibility that a bonding failure may occur, and a desired pressure resistance cannot be obtained.
JP 2003-314987 A

  An object of the present invention is to solve the above problems and provide a heat exchanger in which the pressure resistance of the header tank is improved as compared with the heat exchanger described in Patent Document 1.

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

1) A pair of header tanks spaced from each other, and a plurality of heats disposed between the header tanks in the length direction of the header tank and having both ends connected to both header tanks. A heat exchanger comprising an exchange pipe,
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. And at least one outward bulging portion extending in the length direction and closed by the intermediate plate is formed at each of the header portion forming plate, the intermediate plate, and the pipe connecting plate at a position matching each other. A heat exchanger in which through holes are formed and these plates are brazed to each other with the plates being stopped at the edges of the through holes.

  2) The heat exchanger according to 1) above, wherein the header part forming plate, the intermediate plate, and the pipe connecting plate are brazed to each other in a state of being caulked and stopped around the entire periphery of the through hole.

  3) A flange portion projecting toward the other plate is formed integrally with the peripheral portion of the through hole in one of the header portion forming plate and the intermediate plate, and the flange portion of the one plate is The heat exchanger as described in 2) above, wherein the heat exchanger is inserted into the through hole of the other plate and is expanded, whereby the three plates are crimped.

  4) A flange projecting toward the header forming plate is integrally formed on the peripheral edge of the through hole in the intermediate plate, and this flange is inserted into the through hole of the header forming plate and expanded. The heat exchanger according to 3) above, wherein a peripheral portion of the through hole in the connection plate is protruded toward the intermediate plate and is press-fitted into the through hole of the intermediate plate.

  5) The heat exchanger as described in 4) above, wherein one of the header tanks is arranged on the top and the other on the bottom.

  6) 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. The hole for connecting each pipe insertion hole of the plate into the outward bulging part of the header forming plate is formed in a through shape, and both ends of the heat exchange pipe are in the pipe insertion holes of the pipe connecting plates of both header tanks. The heat exchanger according to 1) above, which is inserted and brazed to the pipe connecting plate.

  7) A plurality of outward projecting portions extending in the length direction are formed on the header portion forming plate at intervals in the width direction, and are adjacent to each other in the width direction of the header portion forming plate, the intermediate plate, and the pipe connecting plate. The heat exchanger according to 1) above, wherein a plurality of through holes are formed in the portion between the matching outer protrusions at intervals in the length direction of these plates.

8) Of the pair of header tanks, four outwardly bulging portions are formed on the header forming plate in the first header tank so as to be lined up in the width direction and the length direction. Two outward bulges arranged on the header forming plate in the second header tank at intervals in the width direction thereof are adjacent to each other in the length direction of the first header tank. Formed to straddle parts,
A plurality of tube insertion holes are formed in both side portions in the width direction of the pipe connection plate of each header tank, and a plurality of communication holes are formed in both side portions in the width direction of the intermediate plate,
In the first header tank, a communication hole of the intermediate plate that communicates with one of the two outer bulging portions of the two outer bulging portions arranged in the width direction. The communication hole of the intermediate plate that communicates with the other outer bulging portion is communicated by the refrigerant turn communicating portion formed in the intermediate plate, so that the two outer bulging portions are communicated with each other. The heat exchanger as described in 7) above.

9) A method for producing the heat exchanger according to 1) above,
A header forming plate having an outward bulge and a through hole, a pipe connecting plate having a smaller through hole at a position matching the through hole of the header forming plate, and a through of the pipe connecting plate Providing an intermediate plate having a through hole of the same size as the hole at a position matching the hole, and having a flange part that can be inserted into the through hole of the header part forming plate at the peripheral part of the through hole;
Laminating the three plates so that the through holes match and the flange portion of the intermediate plate is inserted into the through hole of the header forming plate, and the intermediate plate comes to the intermediate portion,
Temporarily fixing the header forming plate, intermediate plate and pipe connecting plate at the edge of the through hole;
And a method of manufacturing a heat exchanger comprising brazing three plates.

  10) Temporary fixing at the edge of the through holes of the three plates is to use a tube expansion die having an outer shape that is larger than the through holes of the pipe connecting plate and the intermediate plate and smaller than the through holes of the header forming plate. By press-fitting into the through holes of all the plates from the pipe connecting plate side, the peripheral edge of the through hole in the pipe connecting plate protrudes to the intermediate plate side and press fits into the through hole of the intermediate plate. The method for producing a heat exchanger as described in 9) above, which is performed by expanding a flange portion.

  11) A refrigeration cycle that includes an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the compressor, the gas cooler, the evaporator, the decompressor, and the gas cooler and the refrigerant that has come out of the evaporator, and uses a supercritical refrigerant, A supercritical refrigeration cycle in which the evaporator comprises the heat exchanger according to any one of 1) to 8) above.

  12) A vehicle equipped with the supercritical refrigeration cycle described in 11) above as a car air conditioner.

  According to the heat exchanger of 1) above, through-holes are formed at positions matching each other in the header portion forming plate, the intermediate plate, and the pipe connection plate, and these plates are stopped at the edge of the through-hole. Since they are brazed to each other in the state, it is possible to prevent the occurrence of brazing defects between the three plates, and as a result, the pressure resistance of the header tank is improved.

  According to the heat exchanger of the above 2), through holes are formed at positions corresponding to each other in the header portion forming plate, the intermediate plate, and the pipe connecting plate, and these plates are formed over the entire circumference at the peripheral portion of the through hole. Since they are brazed to each other in a crimped state, it is possible to prevent the occurrence of brazing failure between the three plates, and as a result, the pressure resistance of the header tank is improved.

  According to the heat exchangers 3) and 4), it is possible to relatively easily perform the caulking of the three plates before brazing.

  In particular, in the case of the heat exchanger 4), the following effects are obtained. That is, when this heat exchanger is used as an evaporator, as described in 5) above, one of the header tanks is arranged on the bottom and the other on the top. When condensed water is generated on the surface of the corrugated fins arranged between the adjacent heat exchange tubes, the condensed water flows down to the top surface of the lower tank and passes through the through holes of the three plates. Drained below the header tank. Therefore, freezing of condensed water caused by accumulation of a large amount of condensed water between the top surface of the lower header tank and the lower end of the fin is prevented, and as a result, performance degradation when used as an evaporator is prevented. Further, like the heat exchanger of the above 3), a flange portion protruding toward the header portion forming plate side is integrally formed on the peripheral portion of the through hole in the intermediate plate, and this flange portion is formed on the header portion forming plate. When inserted into the through hole and expanded, the peripheral edge of the through hole in the pipe connecting plate is projected to the intermediate plate side and press-fitted into the through hole of the intermediate plate. It becomes the largest, and drainage of condensed water through the through holes of the three plates is performed smoothly.

  According to the heat exchanger of 6) above, it is possible to relatively easily connect the heat exchange pipe to the header tank.

  As in the heat exchangers of 7) and 8) above, when a plurality of outward bulges are formed at intervals in the width direction on the header portion forming plate, There is a risk that poor bonding between the header portion forming plate and the intermediate plate and between the pipe connecting plate and the intermediate plate may occur in the portion between the adjacent outwardly bulging portions. However, even in this case, when configured as in the above 1) to 6), the header portion forming plate and the intermediate plate in the portion between the adjacent outward bulge portions of the header portion forming plate, Further, it is possible to prevent the occurrence of poor bonding between the pipe connection plate and the intermediate plate, and the pressure resistance of the header tank is improved. Further, if a plurality of outwardly bulging portions are formed on the header portion forming plate, the flow direction of the refrigerant in the heat exchanger can be improved by improving the heat exchange performance by appropriately combining such header tanks. It becomes possible to set to a suitable one. Moreover, no separate member such as a partition is required.

  According to the heat exchanger manufacturing method of 9) and 10) above, the heat exchanger of 1) can be manufactured relatively easily.

  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 configuration of an evaporator to which the present invention is applied, FIGS. 4 to 9 show the configuration of the main part of the evaporator, and 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 tubes (4) and the corrugated fins (5) brazed to the heat exchange tubes (4) and the left and right ends of the corrugated fins (5) And an aluminum bear side plate (6) disposed on the corrugated fin (5) and 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. Here, the inside of the first and second outwardly bulging portions (12A) and (12B) is a refrigerant circulation portion in which CO ₂ flows in the left-right direction. 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) leading to the third outer bulge portion (12C) and each communication hole (17) communicating to the fourth outer bulge portion (12D) are defined by the intermediate plate (10 ) In the third outer bulging portion (12C) by communicating with the communication portion for refrigerant turn (18) formed by cutting away 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) that communicate with the first outer bulge (12A) and all the communication holes (17) that communicate with the second outer bulge (12B) 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 first outward bulge is formed by the communication portion (19) for communicating all the communication holes (17) communicating with the first outer bulge portion (12A) and the communication hole (17) communicated by the communication portion (19). A communication passage is formed which is connected to the refrigerant circulation portion in the outlet portion (12A) and in which CO2 flows in the left-right direction, and communicates with all the communication holes (17) communicated in the second outer bulge portion (12B). The refrigerant circulation part that communicates with the refrigerant circulation part in the second outer bulge part (12B) and in which CO2 flows in the left-right direction is established by the communication hole (17) communicated by the part (19) and the communication part (19). Is formed. The intermediate plate (10) is formed by pressing an aluminum bare material.

  The central portion of the header portion forming plate (8) in the width direction, that is, the first and third outward bulge portions (12A) and (12C), and the second and fourth outward bulge portions (12B) and (12D). A plurality of circular through holes (28) are formed at intervals in the left-right direction (the length direction of the header portion forming plate (8)). The through hole (28) is formed at a position shifted in the left-right direction from the heat exchange tube (4). A plurality of circular through-holes (29) are provided at the center of the bottom surface covering portion (13) of the pipe connection plate (9), that is, between the front and rear tube insertion holes (15), for forming the header portion. A plurality are formed at intervals in the left-right direction (the length direction of the pipe connection plate (9)) so as to match the through hole (28) of the plate (8). The through hole (29) and the tube insertion hole (15) are displaced in the left-right direction. Further, in the middle portion of the intermediate plate (10) in the width direction, that is, between the front and rear communication holes (17), a plurality of circular through holes (30) are provided for connecting the header portion forming plate (8) and the pipe. Plural holes are formed at intervals in the left-right direction (the length direction of the intermediate plate (10)) so as to match the through holes (28), (29) of the plate (9). The through hole (30), the communication hole (17), and the communication part (18) are displaced in the left-right direction (see FIG. 7). The inner diameters of the through holes (29) and (30) of the pipe connection plate (9) and the intermediate plate (10) are equal and smaller than the inner diameters of the through holes (28) of the header forming plate (8). . A flange portion (30a) protruding toward the header portion forming plate (8) side is integrally formed at the peripheral portion of the through hole (30) in the intermediate plate (10), and the flange portion (30a) is formed as a header portion. It is inserted into the through hole (28) of the forming plate (8) and expanded, and the peripheral portion of the through hole (29) in the pipe connecting plate (9) is projected to the intermediate plate (10) side. The projecting portion (29a) is press-fitted into the through hole (30) of the intermediate plate (10), whereby the header portion forming plate (8) and the lower surface covering portion (13) of the pipe connecting plate (9) are formed. ) And the intermediate plate (10) are brazed to each other in a state where they are crimped at the peripheral portions of the through holes (28), (29), and (30).

  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.

  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 arranged on the outer side in the vertical direction, i.e., the header part forming plate (31), A brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and arranged in the vertical direction inside, i.e., on the upper side, a pipe connecting plate (32) and a metal bare material, here an aluminum bear material The intermediate plate (33) interposed between the header portion forming plate (31) and the pipe connecting plate (32) is laminated and brazed to each other.

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 openings facing the upper side of the outward bulging portions (34A) (34D) are closed by the intermediate plate (33). 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 in which CO ₂ flows in the left-right direction. 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 FIG. 3). 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) that communicate with the front outer bulge (34A) and all the communication holes (42) that communicate with the rear outer bulge (34B) of 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 front outward bulge is formed by the communication part (43) that communicates all the communication holes (42) that communicate with the front outward bulge (34A) and the communication hole (42) communicated by the communication part (43). A communication part that forms a refrigerant circulation part that communicates with the refrigerant circulation part in the part (34A) and in which CO2 flows in the left-right direction, and that communicates with all the communication holes (42) that communicate with the rear outer bulge part (34B). (43) and the communication hole (42) communicated by the communication part (43), the refrigerant circulation part that communicates with the refrigerant circulation part in the rear outer bulge part (34B) and in which CO2 flows in the left-right direction. Is formed. The intermediate plate (33) is formed by pressing an aluminum bear material.

  A plurality of circular through holes (44) are formed in the left and right direction (for forming the header portion) in the central portion in the width direction of the header portion forming plate (31), that is, between the two outwardly bulging portions (34A) (34BC). A plurality of plates (31 in the length direction) are formed at intervals. The through hole (44) is formed at a position shifted in the left-right direction from the heat exchange tube (4). A plurality of circular through holes (45) are provided at the center of the upper surface covering portion (35) of the pipe connecting plate (32), that is, between the front and rear tube insertion holes (38), for forming the header portion. A plurality are formed at intervals in the left-right direction (the length direction of the pipe connection plate (32)) so as to match the through hole (44) of the plate (31). The through hole (45) and the tube insertion hole (38) are displaced in the left-right direction. Further, in the central portion of the intermediate plate (33) in the width direction, that is, between the front and rear communication holes (42), a plurality of circular through holes (46) are provided for connecting the header portion forming plate (31) and the pipe. A plurality are formed at intervals in the left-right direction (the length direction of the intermediate plate (33)) so as to coincide with the through holes (44), (45) of the plate (32). The through hole (46) and the communication hole (42) are displaced in the left-right direction (see FIG. 6). The inner diameters of the through holes (45) and (46) of the pipe connecting plate (32) and the intermediate plate (33) are equal and smaller than the inner diameter of the through holes (44) of the header forming plate (31). . A flange portion (46a) protruding toward the header portion forming plate (31) side is integrally formed at the peripheral portion of the through hole (46) in the intermediate plate (33), and the flange portion (46a) is formed as a header portion. It is inserted into the through hole (44) of the forming plate (31) and expanded, and the peripheral edge of the through hole (45) in the pipe connecting plate (32) is projected to the intermediate plate (33) side. The projecting portion (45a) is press-fitted into the through hole (46) of the intermediate plate (33), whereby the header portion forming plate (31) and the upper surface covering portion (35) of the pipe connecting plate (32). ) And the intermediate plate (33) are brazed to each other in a state where they are crimped at the peripheral portions of the through holes (44), (45), (46).

  Both header tanks (2) and (3) are manufactured as shown in FIGS.

  First, by pressing the aluminum brazing sheet having a brazing filler metal layer on both sides, the right protrusion (8a), the outward bulge (12A) (12B) (12C) (12D) and the circular through hole ( The lower header tank (3) which forms the header portion forming plate (8) of the upper header tank (2) having 28) and has the outward bulge portions (34A) (34B) and the circular through hole (44) ) Header part forming plate (31). 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 connecting plate (9) of the upper header tank (2) having the engaging portion forming projection piece (16A), the pipe insertion hole (15), and the circular through hole (29) connected to the upper surface covering Part (35), side surface covering part (36), engaging part forming projection piece (37A) straightly connected to side surface covering part (36), pipe insertion hole (38), drainage guide (40) and circular through hole A pipe connecting plate (32) of the lower header tank (3) having (45) is formed. Furthermore, by pressing the aluminum bear material, the right protrusion (10a), notches (21A) (21B), communication holes (17), communication parts (18) (19), circular through holes (30 ) And an intermediate portion of the upper header tank (2) having a flange portion (30a) formed integrally with the peripheral portion of the through hole (30) and inserted into the through hole (28) of the header portion forming plate (8). The plate (10) is formed, and the communication hole (42), the communication part (43), the circular through hole (46) and the peripheral part of the through hole (46) are integrally formed and the header part forming plate (31) An intermediate plate (33) of the lower header tank (3) having a flange portion (46a) that can be inserted into the through hole (44) is formed.

  Next, the three plates (8) (9) (10) and (31) (32) (33) are aligned with the through holes (28) (29) (30) and (44) (45) (46). In addition, the flange portions (30a) (46a) of the intermediate plate (10) (33) are inserted into the through holes (28) (44) of the header portion forming plate (8) (31), and the intermediate plate (10) After combining (33) in a stacked manner so that it comes to the middle part (see FIG. 9 (a)), the projecting pieces (16A) and (37A) are bent to form the engaging parts (16) and (37). The joint portions (16) and (37) are engaged with the header portion forming plates (8) and (31) to form a temporary fixing body.

  After the three plates (8), (9), (10), and (31), (32), and (33) are combined in a stacked manner, the engaging portions (16) and (37) are connected to the header portion forming plate (8). At any stage before or after engaging with (31), the outer diameter is the through hole (29) (45) and (45) of the pipe connecting plate (9) (32) and the intermediate plate (10) (33). 30) A pipe expansion die (47) having a circular cross section which is larger than the inner diameter of (46) and smaller than the inner diameter of the through holes (28) (44) of the header forming plate (8) (31), Through holes (28) (29) (30) and (44) of the three plates (8) (9) (10) and (31) (32) (33) from the connecting plate (9) (32) side ( 45) (46) is press-fitted into the pipe connection plate (9) (32) through the peripheral edge of the through hole (29) (45) to the intermediate plate (10) (33) side, this projecting part ( 29a) and (45a) are press-fitted into the through holes (30) and (46), and the flange portions (30a) and (46a) are expanded to closely contact the inner peripheral surfaces of the through holes (28) and (44) (FIG. 9). (See (b)). Thus, the three plates (8) (9) (10) and (31) (32) (33) are connected to the peripheral portions of the through holes (28) (29) (30) and (44) (45) (46). In this case, the caulking is stopped all around.

  Then, using the brazing material layer of the header forming plate (8) (31), the header forming plate (8) (31) and the intermediate plate (10) (33) are brazed, and further the header Using the brazing material layer of the part forming plate (8) (31) and the pipe connecting plate (9) (32), the covering part (13) (35) of the pipe connecting plate (9) (32) is removed. Braze the intermediate plate (10) (33) and braze the side cover (14) (36) to the front and rear sides of the intermediate plate (10) (33) and the header plate (8) (31). Further, the engaging portions (16) and (37) are brazed to the header portion forming plates (8) and (31). Thus, both header tanks (2) (3) are manufactured.

  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. Multiple 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), which are also located in the left half, are in the third outer bulge (12C) and on the front side. The header tanks (2) and (3) are connected so as to communicate with the 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) are connected to both header tanks (2) and (3) so as to communicate with each other, and the upper and lower ends of the plurality of heat exchange tubes (4), which are also located in the left half, ) And the header tanks (2) and (3) so as to communicate with the inside and the rear outwardly 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.

  The evaporator (1) should be prepared with the above-mentioned two temporary fixing bodies when manufacturing the header tank (2) (3), a plurality of heat exchange tubes (4) and corrugated fins (5), Temporary fixing bodies are arranged at intervals so that the pipe connection plates (9) and (32) face each other, and a plurality of heat exchange pipes (4) and corrugated fins (5) are arranged alternately. The 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 both temporary fixing bodies, and the corrugated fins (5) at both ends. Arranging the side plate (6) on the outside, arranging the refrigerant inlet / outlet member (24) through the brazing sheet (27) so as to straddle the three plates (8), (9), and (10), and The three plates (8) (9) (10) and (31) (32) (33) of the temporary fixing body are brazed to each other to form the header tank (2) (3), and at the same time, the heat exchange pipe ( 4) The header tank (2 ) (3), fin (5) to heat exchange pipe (4), side plate (6) to fin (5), and inlet / outlet member (24) to upper header tank (2). Manufactured.

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.

The CO ₂ flowing into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the first outer bulging portion (12A) flows downward in the refrigerant passages (4a) and goes down 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). The condensed water that has flowed down to the upper surface of the lower header tank (3) falls through the through holes (45), (46), and (44) to the lower side of the lower header tank (3). Here, the inner diameter of the through hole (44) of the header portion forming plate (31) is larger than the inner diameters of the through holes (45) and (46) of the other plates (32) and (33), and in the intermediate plate (33). A flange portion (46a) protruding toward the header portion forming plate (31) side is integrally formed at the peripheral portion of the through hole (46), and the flange portion (46a) is formed as a header portion forming plate (31). In addition, the peripheral portion of the through hole (45) in the pipe connecting plate (32) is projected to the intermediate plate (33) side, and the projecting portion (45a) is expanded. Is press-fitted into the through hole (46) of the intermediate plate (33), so that the condensed water is smoothly drained through the through holes (46), (45) and (44).

  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.

  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.

  FIGS. 11-20 shows the modification of the heat exchange pipe | tube used for the evaporator (1) of embodiment mentioned above. In the following description, the upper and lower sides and the left and right sides of FIGS.

  The heat exchange pipe (160) shown in FIGS. 11 and 12 includes flat upper and lower walls (161) and (162) (a pair of flat walls) facing each other, and left and right edges of the upper and lower walls (161) and (162). It extends between the left and right side walls (163) and (164) and the left and right side walls (163) and (164) across the upper and lower walls (161) and (162) and extends in the length direction with a predetermined distance between them. And a plurality of refrigerant walls (166) arranged in the width direction inside. Here, the reinforcing wall (165) serves as a partition wall between the adjacent refrigerant passages (166). Further, the passage width of the refrigerant passage (166) is equal over the entire height.

  The left side wall (163) has a double structure, and is integrally formed in a raised shape below the left side edge of the upper wall (161) and extends over the entire height of the heat exchange pipe (160). The inner side wall ridges (168) integrally formed in a raised shape below the upper wall (161) on the inside of the convex ridges (167), and the upper side ridges are integrally formed in a raised shape from the left edge of the lower wall (162). The inner side wall ridges (169) are included. The outer side wall projections (167) are connected to the inner side wall projections (168) (169) and the lower wall (162) with the lower end engaged with the lower left edge of the lower wall (162). It is attached. Both the inner side wall ridges (168) and (169) are brazed to each other. The right side wall (164) is formed integrally with the upper and lower walls (161) (162). A protrusion (169a) extending in the longitudinal direction is integrally formed over the entire length on the tip surface of the inner side wall projection (169) of the lower wall (162), and the inner side wall projection (168) of the upper wall (161). A concave groove (168a) that extends in the longitudinal direction and into which the protrusion (169a) is press-fitted is formed over the entire length.

  The reinforcing wall (165) includes a reinforcing wall projection (170) integrally formed in a raised shape below the upper wall (161), and a reinforcing wall projection formed integrally in a raised shape above the lower wall (162). (171) are brazed to each other.

  The heat exchange pipe (160) is manufactured using a pipe manufacturing metal plate (175) as shown in FIG. 13 (a). The metal plate for tube production (175) is formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides, and includes a flat upper wall forming part (176) (flat wall forming part) and a lower part. A wall forming portion (177) (flat wall forming portion), a connecting portion (178) for connecting the upper wall forming portion (176) and the lower wall forming portion (177) and forming the right side wall (164), and the upper wall The convex for the inner side wall that is integrally formed in a raised shape above the side edge opposite to the connecting part (178) in the forming part (176) and the lower wall forming part (177) and forms the inner part of the left side wall (163) It was formed by extending the side edge (right edge) of the upper wall forming part (176) opposite to the connecting part (178) outward in the left and right direction (right side). A plurality of reinforcements integrally formed in an upwardly protruding shape from the outer side wall ridge forming portion (179) and the upper wall forming portion (176) and the lower wall forming portion (177) at predetermined intervals in the left-right direction. Ridges (170) (171) for reinforcing walls, and ridges (170) for reinforcing walls of the upper wall forming portion (176) and ridges (171) for reinforcing walls of the lower wall forming portion (177). The connecting portion (178) is symmetrical with respect to the center line in the width direction. A protrusion (169a) is formed on the tip surface of the inner side wall ridge (169) of the lower wall forming portion (177), and a groove ( 168a) are formed respectively. The heights of the inner side wall projections (168) and (169) and all the reinforcing wall projections (170) and (171) are equal to each other. The upper and lower wall thickness of the connecting portion (178) is larger than the thickness of the upper and lower wall forming portions (175) and (176), and the upper end surface of the connecting portion (178) is the inner side wall ridges (168) (169) and It is substantially flush with the upper end surfaces of the reinforcing wall projections (170) (171).

  By rolling the aluminum brazing sheet clad with brazing material on both sides, the ridges for side walls (168) (169) and the ridges for reinforcing walls (170) (171) are integrally formed on one side. Brazing material on both side surfaces and tip surfaces of the side wall ridges (168) and (169) and the reinforcing wall ridges (170) and (171), and upper and lower wall forming portions (176) and (177). A layer (not shown) is formed.

  Then, the metal plate for tube production (175) is sequentially bent at the left and right side edges of the connecting portion (178) by roll forming (see FIG. 13 (b)) and finally bent into a hairpin shape for the inner side wall. The protrusions (168) and (169) and the reinforcing wall protrusions (170) and (171) are abutted with each other, and the protrusion (169a) is press-fitted into the groove (168a).

  Next, the outer side wall ridge forming part (179) is bent to be along the outer surface of the both inner side wall ridges (168) and (169), and the tip part is deformed to form the lower wall forming part (177). To obtain a bent body (180) (see FIG. 13C).

  Thereafter, the bent body (180) is heated to a predetermined temperature, and the tips of the inner side wall projections (168) (169) are brazed to the tips of the reinforcing wall projections (170) (171), respectively. At the same time, the heat exchange pipe (160) is manufactured by brazing the outer side wall projections (179) and the inner side wall projections (168) (169) and the lower wall formation (177). The The production of the heat exchange pipe (160) is performed simultaneously with the production of the evaporator (1).

  In the case of the heat exchange pipe (185) shown in FIG. 14, the protrusions (186) extending over the entire length and the recessed grooves (187) extending over the entire length are formed on the front end surfaces of all the reinforcing wall protrusions (170) on the upper wall (161). Are formed alternately. In addition, the protrusions (186) of the reinforcing wall projections (170) of the upper wall (161) that are in contact with the leading ends of all the reinforcing wall projections (171) of the lower wall (162) are fitted. The concave grooves (188) and the protrusions (189) that fit into the concave grooves (187) of the reinforcing wall projections (170) of the upper wall (161) are alternately formed over the entire length. Other configurations are the same as those of the heat exchange pipe (160) shown in FIGS. 11 and 12, and are manufactured in the same manner as the heat exchange pipe (160) shown in FIGS.

  The heat exchange pipe (190) shown in FIG. 15 and FIG. 16 has a reinforcing wall projection (191) integrally formed in a protruding shape below the upper wall (161) and brazed to the lower wall (162). The wall (165) and the reinforcing wall (165) formed by brazing the reinforcing wall projection (192), which is integrally formed so as to protrude upward from the lower wall (162), to the upper wall (161) are in the left-right direction. In the upper and lower walls (161) (162), the protrusions (193) covering the entire length are integrally formed with the portions of the upper and lower walls (161) (162) where the reinforcing wall projections (192) (191) abut. A concave groove (194) is formed on the front end surface of the projection (193) to fit the front end of the reinforcing wall projection (191) (192), and the front end of the reinforcing wall projection (191) (192). Is fitted into the groove (194) of the protrusion (193) and brazed to the protrusion (193). The thickness in the left-right direction of the protrusion (193) is slightly larger than the thickness in the left-right direction of the reinforcing wall projections (191) (192). Other configurations are the same as those of the heat exchange pipe (160) shown in FIGS.

  The heat exchange pipe (190) is manufactured using a pipe manufacturing metal plate (195) as shown in FIG. 17 (a). The metal plate for tube production (195) is formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides, and has an upper wall forming portion (176) and a predetermined interval in the left-right direction. A plurality of reinforcing wall ridges (191) and (192), each integrally formed in a raised shape from the lower wall forming portion (177), are provided, and the reinforcing wall ridges (191) of the upper wall forming portion (176) are provided. ) And the reinforcing wall projections (192) of the lower wall forming portion (177) are in positions that are asymmetrical with respect to the center line in the width direction of the connecting portion (178). The heights of the two reinforcing wall projections (191) and (192) are equal to each other, and are about twice the height of the inner sidewall projections (168) and (169). Further, in the upper wall forming portion (176) and the lower wall forming portion (177), the lower wall forming portion (177) and the reinforcing wall projections (192) (191) of the upper wall forming portion (176) are in contact with each other. A projection (193) extending over the entire length is formed integrally, and a concave groove (194) into which the tip of the reinforcing wall projections (192) (191) is fitted is formed on the tip surface of the projection (193). The other structure of the metal plate for tube manufacture (195) is the same as that of the metal plate for tube manufacture (175) shown in FIG.

  Then, the metal plate for tube production (195) is sequentially bent at the left and right side edges of the connecting portion (178) by roll forming (see FIG. 17 (b)) and finally bent into a hairpin shape for the inner side wall. The protrusions (168) and (169) are butted together to press-fit the protrusions (169a) into the grooves (168a), and the top end of the reinforcing wall protrusions (191) of the upper wall forming part (176) In the groove (194) of the projection (193) of the wall forming portion (177), the tip of the reinforcing wall projection (192) of the lower wall forming portion (177) is connected to the protrusion of the upper wall forming portion (176) ( 193) are respectively inserted into the concave grooves (194).

  Next, the outer side wall ridge forming part (179) is bent to be along the outer surface of the both inner side wall ridges (168) and (169), and the tip part is deformed to form the lower wall forming part (177). To obtain a bent body (196) (see FIG. 17 (c)).

  Thereafter, the bent body (196) is heated to a predetermined temperature, and the tips of the inner side wall ridges (168) (169) are brazed to each other, and the tips of the reinforcing wall ridges (191) (192) are attached. By brazing the projections (193), and further brazing the outer side wall projections (179), the inner side wall projections (168) (169) and the lower wall formation (177), An exchange tube (190) is manufactured. The production of the heat exchange pipe (190) is performed simultaneously with the production of the evaporator (1).

  In the case of the heat exchange pipe (200) shown in FIG. 18 and FIG. 19, the reinforcing wall (165) includes reinforcing wall projections (201) and (202) integrally formed in a protruding shape below the upper wall (161), Reinforcing wall projections (203) (204) integrally formed in a raised shape above the lower wall (162) are formed by being brought into contact with each other and brazed. On the upper wall (161) and the lower wall (162), two types of reinforcing wall projections (201), (202), (203) and (204) with different heights are formed alternately in the left-right direction. The protrusions (201) for reinforcing walls with a high protrusion height on the upper wall (161) and the protrusions (204) for reinforcement walls with a low protrusion height on the lower wall (162) are brazed, and the upper wall ( The reinforcing wall ridges (202) having a low protruding height in 161) and the reinforcing wall ridges (203) having a high protruding height in the lower wall (162) are brazed. Hereinafter, the protruding ridges (201) and (203) for the reinforcing wall having the high protruding heights of the upper and lower walls (161) and (162) are referred to as the first protruding ridge for the reinforcing wall, respectively, and the protruding ridge for the reinforcing wall (202) that is also low. (204) shall be called the 2nd reinforcement wall convex strip, respectively. The first reinforcing wall projections of the other walls (162) (161) extend in the longitudinal direction on the tip surfaces of the second reinforcing wall projections (202) (204) of the upper and lower walls (161) (162). The groove (205) (206) into which the tip of the strip (203) (201) fits is formed over the entire length, and the first reinforcing wall projection (201) (203) of the upper and lower walls (161, 162). The reinforcing wall projections (201) (204) and (202) (203) are brazed in a state in which the tip of each of the reinforcing walls is fitted into the concave grooves (206) (205). Other configurations are the same as those of the heat exchange pipe (160) shown in FIGS.

  The heat exchange pipe (200) is manufactured using a pipe manufacturing metal plate (210) as shown in FIG. The metal plate for pipe production (150) is formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides, and has an upper wall forming portion (176) and a lower wall at predetermined intervals in the left-right direction. A plurality of reinforcing wall ridges (201), (202), (203), and (204) that are integrally formed in an upwardly protruding shape from the wall forming portion (177), respectively. 1 Reinforcing wall ridge (201) and second reinforcing wall ridge (204) of lower wall forming portion (177) and second reinforcing wall ridge (202) and lower wall forming portion (176) The first reinforcing wall ridges (203) of the wall forming portion (177) are in positions symmetrical with respect to the center line in the width direction of the connecting portion (178). The first reinforcement of the other wall forming portions (177) and 176 is formed on the front end surfaces of the second reinforcing wall projections (202) and (204) of the upper wall forming portion (176) and the lower wall forming portion (177). Concave grooves (205) (206) into which the tip ends of the wall ridges (203) (201) fit are formed.

  The aluminum brazing sheet clad with brazing material on both sides is rolled and the reinforcing wall projections (201), (202), (203), and (204) are integrally formed on one side, thereby reinforcing the reinforcing wall. On both side surfaces and tip surfaces of the convex ridges (201), (202), (203) and (204) and the inner peripheral surfaces of the concave grooves (205) and (206) of the second reinforcing ridges (202) and (204) A brazing material layer (not shown) is formed. The other structure of the metal plate for pipe manufacture (200) is the same as that of the metal plate for pipe manufacture (175) shown in FIG.

  Then, the metal plate (210) for tube production is sequentially bent at the left and right side edges of the connecting portion (178) by roll forming (see FIG. 20 (b)) and finally bent into a hairpin shape for the inner side wall. The ridges (168) and (169) are abutted with each other, and the front ends of the first reinforcing wall ridges (201) and (203) are formed in the grooves (206) of the second reinforced wall ridges (204) and (202). (205) is inserted, and the protrusion (169a) is press-fitted into the groove (168a).

  Next, the outer side wall ridge forming part (179) is bent to be along the outer surface of the both inner side wall ridges (168) and (169), and the tip part is deformed to form the lower wall forming part (177). To obtain a bent body (215) (see FIG. 20 (c)).

  Thereafter, the bent body (215) is heated to a predetermined temperature, and the tips of the inner side wall ridges (168) and 169, and the first reinforcing wall ridges (201) (203) and the second reinforcing wall are used. While brazing the tips of the ridges (204) and (202), the outer side ridges forming part (179), the inner side wall ridges (168) (169) and the lower wall forming part (177) And the heat exchange pipe (200) is manufactured.

The heat exchanger of the present invention is suitably used for a gas cooler or an evaporator of a supercritical refrigeration cycle in which a supercritical refrigerant such as CO ₂ (carbon dioxide) is used.

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 manufacturing method 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 transverse cross section showing the 1st modification of a heat exchange pipe. It is the elements on larger scale of FIG. It is a figure which shows the manufacturing method of the heat exchange pipe | tube shown in FIG. It is a transverse cross section showing the 2nd modification of a heat exchange pipe. It is a transverse cross section showing the 3rd modification of a heat exchange pipe. It is the elements on larger scale of FIG. It is a figure which shows the manufacturing method of the heat exchange pipe | tube shown in FIG. It is a transverse cross section showing the 4th modification of a heat exchange pipe. It is the elements on larger scale of FIG. It is a figure which shows the manufacturing method of the heat exchange pipe | tube shown in FIG.

Claims (12)

A pair of header tanks spaced from each other, and a plurality of heat exchange tubes disposed between the header tanks in the length direction of the header tank and having both ends connected to the header tanks, respectively. A heat exchanger with
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. And at least one outward bulging portion extending in the length direction and closed by the intermediate plate is formed at each of the header portion forming plate, the intermediate plate, and the pipe connecting plate at a position matching each other. A heat exchanger in which through holes are formed and these plates are brazed to each other with the plates being stopped at the edges of the through holes. 2. The heat exchanger according to claim 1, wherein the header portion forming plate, the intermediate plate, and the pipe connecting plate are brazed to each other in a state where they are crimped around the entire periphery of the through hole. A flange portion protruding toward the other plate is formed integrally with the peripheral portion of the through hole in one of the header portion forming plate and the intermediate plate, and the flange portion of the one plate is the other plate. The heat exchanger according to claim 2, wherein the heat exchanger is inserted into a through-hole of the plate and expanded, whereby the three plates are crimped. A flange that protrudes toward the header forming plate is formed integrally with the peripheral edge of the through hole in the intermediate plate, and this flange is inserted into the through hole of the header forming plate and expanded to provide a pipe connection. The heat exchanger according to claim 3, wherein a peripheral edge portion of the through hole in the plate is protruded toward the intermediate plate and is press-fitted into the through hole of the intermediate plate. The heat exchanger according to claim 4, wherein one of the two header tanks is arranged so that the other is on the top and the other is on the bottom. 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 tube insertion hole to pass through the outward bulging portion of the header forming plate is formed in a penetrating shape, and both ends of the heat exchange tubes are inserted into the tube insertion holes of the pipe connecting plates of both header tanks. The heat exchanger according to claim 1, wherein the heat exchanger is brazed to the pipe connecting plate. The header portion forming plate is formed with a plurality of outward projecting portions extending in the length direction at intervals in the width direction, and the header portion forming plate, the intermediate plate, and the pipe connecting plate are adjacent to each other in the width direction. The heat exchanger according to claim 1, wherein a plurality of through holes are formed at intervals between the side protrusions at intervals in the length direction of these plates. Of the pair of header tanks, four outward bulging portions are formed on the header portion forming plate in the first header tank so as to be arranged in the width direction and the length direction at intervals. The two outward bulges arranged in the header direction forming plate in the header tank at intervals in the width direction are respectively connected to the two outward bulges adjacent to each other in the length direction of the first header tank. Formed to straddle,
A plurality of tube insertion holes are formed in both side portions in the width direction of the pipe connection plate of each header tank, and a plurality of communication holes are formed in both side portions in the width direction of the intermediate plate,
In the first header tank, a communication hole of the intermediate plate that communicates with one of the two outer bulging portions of the two outer bulging portions arranged in the width direction. The communication hole of the intermediate plate that communicates with the other outer bulging portion is communicated by the refrigerant turn communicating portion formed in the intermediate plate, so that the two outer bulging portions are communicated with each other. The heat exchanger according to claim 7. A method for producing a heat exchanger according to claim 1, comprising:
A header forming plate having an outward bulge and a through hole, a pipe connecting plate having a smaller through hole at a position matching the through hole of the header forming plate, and a through of the pipe connecting plate Providing an intermediate plate having a through hole of the same size as the hole at a position matching the hole, and having a flange part that can be inserted into the through hole of the header part forming plate at the peripheral part of the through hole;
Laminating the three plates so that the through holes match and the flange portion of the intermediate plate is inserted into the through hole of the header forming plate, and the intermediate plate comes to the intermediate portion,
Temporarily fixing the header forming plate, intermediate plate and pipe connecting plate at the edge of the through hole;
And a method of manufacturing a heat exchanger comprising brazing three plates. Temporary fixing at the edge of the through hole of the three plates is performed by using a pipe expanding die having an outer shape larger than the through hole of the pipe connecting plate and the intermediate plate and smaller than the through hole of the header forming plate. By press-fitting into the through holes of all the plates from the connection plate side, the peripheral edge of the through hole in the pipe connection plate protrudes to the intermediate plate side and press fits into the through hole of the intermediate plate, and the flange part of the intermediate plate The manufacturing method of the heat exchanger of Claim 9 performed by expanding a pipe | tube. 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 claim 1. A vehicle in which the supercritical refrigeration cycle according to claim 11 is mounted as a car air conditioner.

Images