WO2006129598A1

WO2006129598A1 - Heat exchanger

Info

Publication number: WO2006129598A1
Application number: PCT/JP2006/310654
Authority: WO
Inventors: Shigeharu Ichiyanagi
Original assignee: Showa Denko K.K.
Priority date: 2005-06-01
Filing date: 2006-05-29
Publication date: 2006-12-07
Also published as: JP4898672B2; JPWO2006129598A1

Abstract

Header tanks (2, 3) for a heat exchanger are composed of plates (8, 31) for forming header sections, plates (9, 32) for connecting pipes, and intermediate plates (10, 33) interposed between the plates (8, 9, 31, 32). Externally swollen sections (12A, 12B, 34A, 34B) are formed on the plates (10, 33). Between adjacent externally swollen sections (12A, 12B, 34A, 34B), there are formed through-holes (28, 29, 30, 44, 45, 46) in the three plates (8, 9, 10, 31, 32, 33), at positions where the holes aligned with each other. Flanges (30a, 46a) are integrally formed with peripheral edges of the through-holes (30, 46) of the intermediate plates (10, 33). The flanges (30a, 46a) are inserted into the through-holes (18, 44) of the plates (8, 31) and expanded in diameter, and further, peripheral edges of through-holes (29, 45) of the plates (9, 32) are projected to the plate (10, 33) side to be pressed into the through-holes (30, 46). As a result, the three plates (8, 9, 10, 31, 32, 33) are swaged and fixed at the peripheral edges of the through-holes (28, 29, 30, 44, 45, 46), and in this state, the three plates are then brazed to each other. Pressure resistance of the header tanks is improved.

Description

Specification

Heat exchanger

Technical field

[0001] The present invention relates to heat exchange ^^, and more particularly, for example, CO (carbon dioxide).

2

The present invention relates to a heat exchanger used suitably for a gas cooler or an evaporator of a supercritical refrigeration cycle in which a supercritical refrigerant 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 reaches a supercritical state exceeding the critical pressure on the high-pressure side. Means refrigerant used in the supercritical refrigeration cycle.

Background art

[0003] As a heat exchange 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 are both The header tank is composed of a heat exchange pipe connected to the header tank and fins disposed in the ventilation gap between adjacent heat exchange pipes and brazed to the heat exchange pipe. A header portion forming plate formed with a fluid circulation portion spaced in the width direction; a tube connecting plate having a plurality of tube insertion holes formed in a penetrating manner in the length direction and the width direction; A plurality of communication holes arranged along the inside of the pipe connection plate and passing through the pipe insertion holes of the pipe connection plate into the header portion forming member are formed in a penetrating manner with a gap in the length direction. , Know what consists of an intermediate plate Te, Ru (see Patent Document 1, FIG. 15).

[0004] 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 There is a possibility that poor bonding between the pipe connection plate and the intermediate plate may occur, and there is a problem that desired pressure resistance cannot be obtained.

Patent Document 1: Japanese Patent Laid-Open No. 2003-314987 Disclosure of the invention

Problems to be solved by the invention

[0005] An object of the present invention is to solve the above problems and provide heat exchange in which the pressure resistance of the header tank is improved as compared with the heat exchanger described in Patent Document 1.

Means for solving the problem

[0006] In order to achieve the above object, the present invention has the following aspect.

[0007] 1) A pair of header tanks arranged at a distance from each other, and arranged between the header tanks in the length direction of the header tank, and both ends thereof are connected to both header tanks. A heat exchange ^^ with multiple heat exchange tubes,

Each header tank force The header part forming plate, the pipe connecting plate, and the intermediate plate interposed between the two plates are laminated and brazed to each other. And at least one outward bulging portion extending in the length direction and having the opening closed by the intermediate plate is formed at a position that matches each other on the header portion forming plate, the intermediate plate, and the pipe connecting plate. A heat exchange where each through-hole is formed and these plates are brazed together with the plate being stopped at the edge of the through-hole.

[0008] 2) The above description 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 over the entire periphery at the peripheral portion of the through hole. Heat exchanger.

[0009] 3) A flange projecting toward the other plate is integrally formed on the peripheral edge of the through hole in one of the header forming plate and the intermediate plate, and the one plate The heat exchanger described in 2) above, in which the flange portion of the other plate is inserted into the through hole of the other plate and is expanded, so that the three plates are crimped.

[0010] 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 the pipe is expanded. The peripheral edge of the through hole in the pipe connection plate is projected to the intermediate plate side and is press-fitted into the through hole of the intermediate plate 3) The described heat exchanger.

[0011] 5) The heat exchanger according to 4) above, wherein one of the two header tanks is disposed so that the other is at the top and the other is at the bottom.

[0012] 6) A plurality of tube insertion holes are formed in a portion corresponding to the outward bulging portion of the pipe connection plate in a penetrating manner with an interval in the length direction of the pipe connection plate. A through hole is formed in the pipe connection plate so that each tube insertion hole passes through the outward bulging portion of the header forming plate, and both ends of the heat exchange pipe are connected to the pipe connecting plate of both header tanks. The heat exchanger as described in 1) above, which is inserted into the pipe insertion hole of the second pipe and brazed to the pipe connection plate.

[0013] 7) A plurality of outward projecting portions extending in the length direction are formed in the header portion forming plate at intervals in the width direction, and the header portion forming plate, the intermediate plate, and the pipe connecting plate The heat exchanger as described in 1) above, wherein a plurality of through holes are formed at intervals between the protruding portions adjacent in the width direction in the length direction of these plates.

[0014] 8) Of the pair of header tanks, four outward bulging portions are formed on the header portion forming plate in the first header tank side by side in the width direction and the length direction. Similarly, two outwardly bulging portions arranged at intervals in the width direction on the header portion forming plate in the second header tank are adjacent to each other in the length direction of the first header tank. Formed to straddle the outward bulge,

A plurality of pipe insertion holes are formed on both sides in the width direction of the pipe connection plate of each header tank, and a plurality of communication holes are formed on both sides in the width direction of the intermediate plate.

In the first header tank, a communication hole in the intermediate plate that communicates with one of the two outer bulges of the two outer bulges arranged in the width direction. The communication hole of the intermediate plate that communicates with the other outward bulge part is communicated by the communication part for the coolant turn formed in the intermediate plate, so that the two outward bulge parts communicate with each other. The heat exchanger as described in 7) above, which is combined!

[0015] 9) A method for producing the heat exchanger according to 1) above,

Header portion forming plate having an outward bulging portion and a through hole, and a header portion forming plate A pipe connection plate having a smaller through hole at a position that matches the through hole of the port, and a through hole of the same size at a position that matches the through hole of the pipe connection plate Preparing an intermediate plate having a flange portion that can be inserted into the through hole of the header portion forming plate at the peripheral portion of the through hole;

Stack 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 fix the header forming plate, intermediate plate and pipe connecting plate at the edge of the through-hole,

As well as a method of manufacturing heat exchange ^ including brazing three plates.

[0016] 10) Expanding the temporary fixing at the edge of the through hole of the three plates with 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 pressing the metal mold into the through holes of all the plates from the pipe connection plate side, the peripheral edge of the through holes in the pipe connection plate protrudes to the intermediate plate side and press fits into the through holes of the intermediate plate. The method for producing a heat exchanger as described in 9) above, which is performed by expanding the flange portion of the intermediate plate.

[0017] 11) A refrigeration cycle that includes an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the compressor, gas cooler, evaporator, decompressor, and gas cooler and the refrigerant that has come out of the evaporator, and that uses a supercritical refrigerant A supercritical refrigeration cycle in which the evaporator has a heat exchange force as described in any one of 1) to 8) above.

[0018] 12) A vehicle equipped with the supercritical refrigeration cycle described in 11) above as a car air conditioner.

The invention's effect

[0019] According to the heat exchanger of 1) above, through holes are formed in the header portion forming plate, the intermediate plate, and the pipe connecting plate at positions that match each other, and these plates are formed at the edges of the through holes. Since they are brazed to each other in a stopped state, the occurrence of brazing defects between the three plates is prevented, and as a result, the pressure resistance of the header tank is improved.

[0020] According to the heat exchanger of 2) above, the header forming plate, the intermediate plate, and the pipe connection Through-holes are formed at positions that match each other on the plate, and these plates are brazed to each other with the entire periphery of the through-holes being crimped. The occurrence of brazing defects is prevented, and as a result, the pressure resistance of the header tank is improved.

[0021] According to the heat exchangers of 3) and 4) above, the caulking of the three plates before brazing can be relatively easily performed.

[0022] In particular, the following effects can be obtained in the case of the heat exchanger 4). That is, when this heat exchanger is used as an evaporator, it is arranged so that one of the header tanks is at the bottom and the other is at the top as in 5) above. When condensed water is generated on the surface of corrugated fins arranged between adjacent heat exchange tubes, this condensed water flows down to the top surface of the lower tank and passes through the through holes of the three plates. Drain down to the side 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. Is done. Further, as in the heat exchanger of 3) above, a flange portion protruding toward the header portion forming plate side is integrally formed at the peripheral portion of the through hole in the intermediate plate, and this flange portion is the header portion forming plate. When the peripheral portion of the through hole in the pipe connecting plate is protruded toward the intermediate plate and is press-fitted into the through hole of the intermediate plate, the header portion forming plate is inserted. The through-hole is the largest, and the condensate drains smoothly through the through-holes of the three plates.

[0023] According to the heat exchanger of 6), it is possible to relatively easily connect the heat exchange pipe to the header tank.

[0024] 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 forming plate, There is a risk of poor bonding between the header portion forming plate and the intermediate plate, and the pipe connecting plate and the intermediate plate at the portion between the outward bulging portions adjacent in the width direction of the plate. However, even in this case, the header portion forming plate in the portion between the adjacent outwardly bulged portions of the header portion forming plate is configured as described in 1) to 6) above. And middle It is possible to prevent the occurrence of poor bonding between the plate and the pipe connection plate and the intermediate plate, and the pressure resistance of the header tank is improved. In addition, if a plurality of outward bulges are formed on the header forming plate, by appropriately combining such header tanks, the heat flow performance of the refrigerant in the heat exchanger can be improved. Therefore, it is possible to set it to a suitable one. Also, a separate force such as a partition is not required.

[0025] According to the manufacturing method of heat exchange of 9) and 10) above, the heat exchange of 1) can be manufactured relatively easily.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the heat exchange according to the present invention is applied to an evaporator of a supercritical refrigeration cycle.

[0027] In the following description, the upper and lower sides and the left and right sides in Figs. In addition, 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.

FIGS. 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. Show.

[0029] In FIGS. 1 to 3, a supercritical refrigeration cycle using a supercritical refrigerant such as CO is shown.

2

The evaporator (1) is spaced in the left-right direction between the two header tanks (2) (3) and the two header tanks (2) (3). Are arranged outside of the heat exchange pipes (4) between the flat heat exchange pipes (4) and the adjacent heat exchange pipes (4), and the heat exchange pipes (4) at both ends. Corrugated fins (5) brazed to the heat exchange pipe (4) and aluminum bare side plates (5) placed on the outside of the corrugated fins (5) at the left and right ends and brazed to the corrugated fins (5) 6) with

[0030] 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 is disposed on the outer side in the vertical direction, that is, on the header part forming plate ( 8) and brazing sheets with brazing filler metal layers on both sides, Here, a pipe connecting plate (9) formed of an aluminum brazing sheet and arranged on the inner side in the vertical direction, that is, the lower side, and a metal bar material, here an aluminum bear material, and a header part forming plate (8 ) And an intermediate plate (10) interposed between the pipe connecting plate (9) and are laminated and brazed to each other.

[0031] 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 in the front-rear direction. 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 The outwardly bulging portion (12C) at the front side portion is referred to as a third outwardly bulging portion, and the outwardly protruding portion (12D) at the left rear portion is referred to as a fourth outwardly bulging portion. The openings facing downwards of the outward bulges (12A) to (12D) are blocked 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 first and second outer bulging portions (12AX12B) are refrigerant circulation portions in which the internal force CO flows in the left-right direction. Header forming plate (8)

2

Is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

[0032] The pipe connection plate (9) of the upper header tank (2) is formed by the lower surface covering portion (13) covering the inner surface in the vertical direction of the intermediate plate (10), here the lower surface, and the lower surface covering portion (13). It is formed integrally on the front and rear side edges so as to protrude upward, and the front end reaches the outer surface of the header forming plate (8) and both the front and rear sides of the header forming plate (8) and the intermediate plate (10). It consists of a side cover (14) that covers the entire surface. The lower cover (13) is brazed to the lower surface of the intermediate plate (10), and the side cover (14) is brazed to both the front and rear sides of the header plate (8) and intermediate plate (10). ing. 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. Brazed to the part forming plate (8).

[0033] A plurality of through-tube insertion holes (15) that are long in the front-rear direction are provided in the left-right direction on both the front-rear side portions of the lower surface covering portion (13) of the pipe connection plate (9) of the upper header tank (2). Are formed at intervals. A 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 outer bulge portion (12A) of the header forming plate (8), and the right side of the rear side The plurality of tube insertion holes (15) in the half are formed in the lateral direction of the second outer bulge portion (12B), and the plurality of tube insertion holes (15) in the front left half are (3) The plurality of tube insertion holes (15) in the left half of the rear side are formed in the lateral direction of the outer bulge (12C). It is formed within the range. 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). It protrudes outward from the front and rear side edges of the side bulges (12A) to (12D) (see FIG. 3). The pipe connecting plate (9) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

[0034] At the position corresponding to the pipe insertion hole (15) in the intermediate plate (10) of the upper header tank (2), the pipe insertion hole (15) of the pipe connection plate (9) is connected to the header portion forming plate (8 ) Are formed in the same number as the tube insertion holes (15). The through-hole communication holes (17) communicate with the outward bulges (12A) to (12D). The communication hole (17) is slightly larger than the tube insertion hole (15). The plurality of tube insertion holes (15) in the right half of the front side of the pipe connection plate (9) are routed through the plurality of communication holes (17) in the right half of the front side of the intermediate plate (10). The plurality of tube insertion holes (15) in the right half of the rear side are communicated into the first outer bulge (12A), and the plurality of communication holes in the right half of the rear side of the intermediate plate (10) A plurality of tube insertion holes (15) in the left half of the front side that is communicated with the second outward bulge portion (12B) through the hole (17) are connected to the front side of the intermediate plate (10). The plurality of tube insertion holes (15) in the rear left half are connected to the third outer bulge (12C) through the plurality of communication holes (17) in the left half. The plate (10) is communicated with the fourth outward bulge (12D) through a plurality of communication holes (17) in the left half of the rear side.

[0035] Each communication hole (17) that communicates with the third outer bulge (12C) and each communication hole (17) that communicates with the fourth outer bulge (12D) in the intermediate plate (10) The plate (10) is communicated by the refrigerant turn communication portion (18) formed by cutting away the portion between the communication holes (17) adjacent in the front-rear direction, whereby the third outer bulging portion (12C ) And the fourth outer bulge (12D) communicate with each other (see Fig. 4). All the communication holes (17) leading into the first outer bulge (12A) and all the communication holes (17) leading into the second outer bulge (12B) are connected to the intermediate plate (10). Are communicated by a communication portion (19) formed by cutting away a portion between the communication holes (17) adjacent to each other in the left-right direction (see FIG. 4). Lead to first outer bulge (12A) Refrigerant circulation part in the first outer bulge part (12A) by the communication part (19) communicating with all the communication holes (17) and the communication hole (17) communicated by the communication part (19) A communication part (19) and a communication part (19) are formed to communicate all the communication holes (17) in the second outer bulge part (12B). The communication hole (17) communicated by) forms a refrigerant circulation part that communicates with the refrigerant circulation part in the second outer bulge part (12B) and in which C02 flows in the left-right direction. The intermediate plate (10) is formed by applying press caloe to the aluminum bare material.

At the center in the width direction of the header forming plate (8), that is, between the first and third outer bulges (12AX12C) and the second and fourth outer bulges (12BX12D) 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 in the header portion at the center portion in the width direction of the lower surface covering portion (13) of the pipe connection plate (9), that is, between the front and rear tube insertion holes (15). A plurality are formed at intervals in the left-right direction (the length direction of the pipe connecting plate (9)) so as to match the through hole (28) of the forming plate (8). The through hole (29) and the tube insertion hole (15) are displaced in the left-right direction. Furthermore, in the central part 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) force header plate forming plate (8) and pipe connection A plurality are formed at intervals in the left-right direction (the length direction of the intermediate plate (10)) so as to match the through hole (28X29) 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 (29X30) 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) projecting toward the header portion forming plate (8) side is formed in the peripheral portion of the through hole (30) in the intermediate plate (10), and this flange portion (30a) Is inserted into the through hole (28) of the header forming plate (8) and expanded, and the periphery of the through hole (29) in the pipe connecting plate (9) protrudes toward the intermediate plate (10). This protrusion (29a) is press-fitted into the through hole (30) of the intermediate plate (10), so that the header portion forming plate (8) and the pipe connection plate (9) are covered with the lower surface. Caulking at the periphery of the part (13), the intermediate plate (10) and the force through hole (28X29X30) They are brazed to each other in a stopped state.

[0037] As shown in FIG. 4 and FIG. 5, two right protrusions (8 _a X9a) (10 _a ) are formed at the right ends of the three plates (8X9X10) at intervals in the front-rear direction. Has been. The intermediate plate (10) has a notch (21AX21B) that leads to the communication hole (17) at the tip end of the front and rear two outward projections (10a). In addition, 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. Refrigerant outflow to the refrigerant inlet (25) and refrigerant outlet (23) leading to the refrigerant inlet (22) so as to straddle the two right protrusions (8a) (9a) (10a) of the three plates (8X9X10) A refrigerant inlet / outlet member (24) having a passage (26) is brazed to the upper header tank (2) by a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet (27). The refrigerant inlet / outlet member (24) is also a metal bare material, here an aluminum bare material.

[0038] 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 used for forming a header portion disposed on the outer side in the vertical direction, that is, on the lower side. A plate (31), a brazing sheet having a brazing material layer on both sides, here a pipe connecting plate (32) formed from an aluminum brazing sheet and arranged in the vertical direction, that is, on the upper side, a metal bearing material, Here, the aluminum bare material is also used, and the intermediate plate (33) interposed between the header forming plate (31) and the pipe connecting plate (32) is laminated and brazed to each other. Consists of

[0039] Two outer bulges (34AX34B) extending in the left-right direction are formed on the header portion forming plate (31) of the lower header tank (3), and the first outer bulge (12A) and the third A header forming plate spaced in the front-rear direction so as to straddle the outer bulge (12C) and the second outer bulge (12B) and the fourth outer bulge (12D). The right end force of (31) is also formed over the left end. The opening facing upward of each outward bulge (34AX34D) is closed by an intermediate plate (33). The bulge height, length and width of each outward bulge part (34AX34D) are equal. Here, the inside of each outward bulge (34AX34B) is a refrigerant circulation section where CO flows in the left-right direction.

2

Yes. The header portion forming plate (31) is formed by applying a pressing force to an aluminum brazing sheet having a brazing filler metal layer on both sides. [0040] The pipe connection plate (32) of the lower header tank (3) includes an upper surface covering portion (35) that covers the upper and lower inner surfaces of the intermediate plate (33), here the upper surface, and an upper surface covering portion (35 ) And the front and rear side edges of the header part forming plate (31) and the intermediate plate (33). And a side surface covering portion (36) that covers both front and rear side surfaces over the entire height. The upper cover (35) is brazed to the upper surface of the intermediate plate (33), and the side cover (36) is brazed to the front and rear side surfaces of the header plate (31) and the intermediate plate (33). Yes. 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. Brazed to plate (31).

[0041] A plurality of through-hole insertion holes (38) that are long in the front-rear direction are provided on the left and right sides of the upper surface covering (35) in the pipe connection plate (32) of the lower header tank (3). It is formed at intervals in the direction. The plurality of front-side tube insertion holes (38) are formed in the lateral range of the front outer bulge portion (34A) of the header portion forming plate (31), and the plurality of rear-side tube insertion holes (38 ) Is formed within a range in the left-right direction of the rear outward bulge portion (34B). The length of each pipe insertion hole (38) is slightly longer than the width in the front-rear direction of each outward bulge (34AX34B). It protrudes outward from the front and rear edges of the part (34AX34B) (see Fig. 3). The pipe connection plate (32) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

[0042] A plurality of drainage guides (40) are formed on the pipe connection plate (32) at intervals in the left-right direction. In the example shown in the figure, 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, it is not limited to this, and it may be formed at the same position as the heat exchange pipe (4) in the left-right direction. The drainage guide (40) is formed by cutting the pipe connection plate (32) by cutting the upper surface covering part (35) in the front-rear direction and the partial force on the upper part of both side surface covering parts (36) ( 41). A groove is formed by the cut portion (41) and the intermediate plate (33). The part present on the top cover part (35) of the excision part (41) is tapered so that the tip is pointed inward in the front-rear direction, and the part present in the side cover part (36) is also directed downward. The tip is tapered so that the tip is sharp. [0043] At the position corresponding to the tube insertion hole (38) in the intermediate plate (33), the tube insertion hole (38) of the pipe connection plate (32) is connected to the outward bulging portion of the header forming plate (31). The same number of through-hole communication holes (42) communicating with (34AX34B) as the tube insertion holes (38) are formed. The communication hole (42) is one size larger than the pipe hole (38). The plurality of tube insertion holes (38) on the front side of the pipe connection plate (32) are connected to the inside of the front outer bulge portion (34A) via the plurality of communication holes (42) on the front side of the intermediate plate (33). The plurality of rear tube insertion holes (38) are also connected to the rear outer bulge (34B) via the rear communication holes (42) on the intermediate plate (33). It is made to lead to. 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 communicated by a communicating portion (43) formed by cutting a portion between the communicating holes (42) adjacent in the left-right direction (see FIG. 6). The front outward bulge is established by the communication part (43) communicating with all the communication holes (42) communicating with the front outer bulge (34A) and the communication hole (42) communicated with the communication part (43). A refrigerant circulation part is formed which communicates with the refrigerant circulation part in the part (34A) and in which C02 flows in the left-right direction, and communicates with all the communication holes (42) communicating with the rear outer bulge part (34B). Refrigerant flow through the refrigerant circulation section in the rear outer bulge section (34B) and C02 flows in the left-right direction by the communication hole (42) communicated by the section (43) and the communication section (43) The part is formed. The intermediate plate (33) is formed by pressing an aluminum bare material.

[0044] A plurality of circular through holes (44) are formed in the left-right direction (header portion formation) in the central portion in the width direction of the header portion forming plate (31), that is, the portion between both outwardly bulging portions (34 AX34BC). A plurality of plates are formed at intervals in the longitudinal direction of the plate (31) for use. The through-hole (44) is formed at a position shifted from the left and right of the heat exchange tube (4)! Speak. A plurality of circular through holes (45) are formed in the central portion in the width direction of the upper surface covering portion (35) of the pipe connection plate (32), that is, the portion between the front and rear tube insertion holes (38). A plurality of holes are formed at intervals in the left-right direction (the length direction of the pipe connection plate (32)) so as to coincide with the through hole (44) of the plate (31) for use. The through hole (45) and the tube insertion hole (38) are displaced in the left-right direction. Furthermore, 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) force header portion forming plate (31) and pipe connection plate Mates with (32) through hole (44X45) In this way, a plurality are formed at intervals in the left-right direction (the length direction of the intermediate plate (33)). The through hole (46) and the communication hole (42) are displaced in the left-right direction (see Fig. 6). The inner diameter of the through hole (45X46) of the pipe connection plate (32) and the intermediate plate (33) is equal and smaller than the inner diameter of the through hole (44) of the header forming plate (31). . A flange portion (46a) projecting toward the header portion forming plate (31) side is formed in the peripheral portion of the through hole (46) in the intermediate plate (33), and this flange portion (46a) is formed in the header. It is inserted into the through hole (44) of the part forming plate (31) and expanded, and the peripheral edge of the through hole (45) in the pipe connecting plate (32) is projected toward the intermediate plate (33). At the same time, the projecting portion (45a) is press-fitted into the through hole (46) of the intermediate plate (33), so that the header portion forming plate (31) and the pipe connecting plate (32) are covered with the upper surface. (35) and the intermediate plate (33) are brazed to each other in a state of being crimped at the peripheral edge of the through hole (44) (45X46).

[0045] Both header tanks (2) and (3) are manufactured as shown in Figs.

[0046] First, by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides, a right protrusion (8a), an outward bulge (12A) (12B) (12C) (12D), and a circular shape The lower header tank (3) which forms the header portion forming plate (8) of the upper header tank (2) having the through hole (28) and has the outer bulge portion (34AX34B) and the circular through hole (44). ) Header plate forming plate (31). In addition, by pressing the aluminum brazing sheet that has the brazing filler metal layer on both sides, the right-hand protruding part (9a), bottom cover part (13), side cover part (14), and side cover part (14) It forms the pipe connection plate (9) of the upper header tank (2) having the engaging piece forming protrusions (16A), pipe insertion holes (15), and circular through holes (29) that are straightly connected, Top cover part (35), side face cover part (36), engagement part forming protrusion (37A) connected straight to side cover part (36), pipe insertion hole (38), drainage guide (40) and A pipe connection plate (32) for the lower header tank (3) having a circular through hole (45) is formed. Furthermore, by applying a pressing force to the aluminum bear material, the right protrusion (10a), notch (21A) (21B), communication hole (17), communication part (18X19), circular through hole (30) and an upper header tank (2) that has a flange portion (30a) that is formed integrally with the peripheral portion of the through hole (30) and can be inserted into the through hole (28) of the header forming plate (8). ) Intermediate plate (10), and formed integrally with the peripheral edge of the communication hole (42), the communication part (43), the circular through hole (46) and the through hole (46) and the header part. An intermediate plate (33) of the lower header tank (3) having a flange portion (46a) that can be inserted into the through hole (44) of the forming plate (31) is formed.

[0047] Next, the three plates (8) (9) (10) and (31) (32) (33) are aligned with the through holes (28) (29) (30) and (4 4X45X46). The flange (30a) (46a) of the plate (10X33) is inserted into the through hole (28X44) of the header forming plate (8) (31), and the intermediate plate (10) (33) comes to the intermediate part. (See Fig. 9 (a)), the protruding piece (16AX37A) is bent to form the engaging part (16X37), and the engaging part (16X37) is used as the header forming plate (8X31). Engage with to make a temporary stop.

[0048] Also, after the three plates (8X9X10) and (31X32X33) are combined in a stacked manner, either before or after engaging the engaging portion (16X37) with the header portion forming plate (8) (31) In this stage, the outer diameter is larger than the inner diameters of the through holes (29) (45) and (30X46) of the pipe connection plate (9) (32) and intermediate plate (10X33) and the header forming plate (8 ) (31) Through hole (2 8X44) The pipe expansion die (47) with a circular cross-section smaller than the inner diameter is inserted into the three plates (8) (9) (10) from the pipe connection plate (9X32) side. And (31) (32) (33) through-hole (28) (29) (30) and (44X45) (46) press-fit into the pipe connection plate (9) (32) through-hole (29X45) The projecting part (29a) (45a) is pressed into the through hole (30X46) and the flange part (30a) (46a) is expanded and penetrated. Closely contact the inner surface of the hole (28X44) (see Fig. 9 (b)). In this way, the three plates (8) (9) (10) and (31X32X33) are caulked over the entire circumference of the through holes (28) (29) (30) and (44X45X46). Stop it.

[0049] After that, using the brazing material layer of the header portion forming plate (8) (31), the header portion forming plate (8) (31) and the intermediate plate (10X33) are brazed. Using the brazing material layer of the header forming plate (8) (31) and the pipe connecting plate (9X32), the covered part (13X35) of the pipe connecting plate (9X32) is brazed to the intermediate plate (10X33). The side cover (14X36) is brazed to the front and rear sides of the intermediate plate (10X33) and header forming plate (8) (31), and the engaging portion (16X37) is used to form the header. Braze to plate (8) (31). In this way, both header tanks (2) and (3) are manufactured.

[0050] The heat exchange pipe (4) is made of a metal bare material, here an aluminum extruded shape, and has a wide flat shape in the front-rear direction and a plurality of refrigerant passages (4a) extending in the length direction therein. ) In parallel (See Fig. 4 and Fig. 6). Both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (15X38) of both header tanks (2) and (3), and the layer of the pipe connection plate (9X32) is used. And brazed to the pipe connection plate (9X32). 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 two header tanks (2) and (3), a plurality of heat exchange tubes (4) arranged in parallel with a space in the left-right direction are aligned in the front-rear direction. In multiple rows, here two rows. The upper and lower ends of the 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), and the upper and lower ends of the heat exchange tubes (4), which are also located in the left half, are in the third outer bulge (12C) and on the front side. It is connected to both header tanks (2) and (3) so as to communicate with the outward bulge (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) is connected to both header tanks (2) and (3) so as to communicate with the inside of (34B), and the upper and lower ends of the plurality of heat exchange tubes (4), which are also located in the left half, ) It is connected to both header tanks (2) and (3) so as to communicate with the inner and rear outer bulges (34B).

[0051] The corrugated fin (5) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and is connected in parallel in the front-rear direction to a connecting portion that connects the wave head and the wave bottom. Several louvers are formed! The corrugated fin (5) is shared by the front and rear heat exchanger tubes (4A), and the width in the front and rear direction is the front edge and the rear heat of the heat exchanger tubes (4) of the front heat exchanger tubes (4A). The intervals between the rear edge of the heat exchange pipe (4) of the exchange pipe group (4A) are almost equal. Instead of one corrugated fin (5) shared by both the front and rear heat exchange tube groups (4A), the corrugated fins are arranged between adjacent heat exchange tubes (4) of both heat exchange tube groups (4A). Is arranged, ok.

[0052] The evaporator (1) is provided 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). , Arrange the two temporary fixing bodies at an interval so that the pipe connection plates (9X32) face each other, and arrange the heat exchange pipes (4) and corrugated fins (5) alternately Insert both ends of the heat exchange pipe (4) into the pipe insertion holes (15X38) of the pipe connection plate (9X32) of both temporary fixing bodies, Arranging the side plate (6) outside the corrugated fins (5) at both ends, arranging the refrigerant inlet / outlet member (24) via the brazing sheet (27) so as to straddle the three plates (8X9X10), And three plates (8) (9) (10) and (31X32X33) of the temporary fixing body are attached to each other to form a header tank (2) (3), and at the same time, the heat exchange pipe (4) is attached to the header. Fill the tank (2) (3), fin (5) to the heat exchanger tube (4), side plate (6) to the fin (5), and inlet / outlet member (24) to the upper tank (2). It is manufactured by attaching.

[0053] The evaporator (1) is a compressor, gas cooler, pressure reducer, gas-liquid separator, and gas supercooler, and performs a supercritical refrigeration cycle with intermediate heat exchange that exchanges heat between the refrigerant that has come out and the refrigerant that has come out from the evaporator. It is configured and mounted on a vehicle such as an automobile as a car air conditioner. In the supercritical refrigeration cycle, CO, ethylene, ethane, acid are used as supercritical refrigerants.

2

Nitrogenide or the like is used.

[0054] In the above-described evaporator (1), as shown in Fig. 10, the refrigerant inlet passes through the refrigerant inflow passage (25) of the CO force inlet / outlet member (24) that has been reduced in pressure through the pressure reducer (expansion valve). (22) up

2

Enters the first outer bulge (12A) of the side header tank (2), flows to the left in the first outer bulge (12A), and into the first outer bulge (12A). It flows into the refrigerant passages (4a) of all the heat exchange tubes (4) that are in communication.

[0055] The CO that has flowed into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the first outer bulging portion (12A) flows downward through the refrigerant passages (4a). The front header tank (3)

2

Flows into section (34A). CO that has flowed into the front outward bulge (34A)

2

The flow then flows to the left and flows into the refrigerant passages (4a) of all the heat exchange pipes (4) communicating with the third outer bulge (12C).

[0056] The CO flowing into all the heat exchange pipes (4) communicating with the third outward bulge (12C)

2 Change the flow direction and flow upward in the refrigerant passage (4a) and enter the third outward bulging portion (12C) of the upper header tank (2). The CO that has flown into the third outer bulge (12C)

2

) Through the refrigerant turn communication part (18) of the intermediate plate (10) and into the fourth outer bulge part (12D), and is divided and connected to the fourth outer bulge part (12D). Flows into the refrigerant passage (4a) of all the heat exchange pipes (4), changes the flow direction and flows downward in the refrigerant passage (4a) to the rear outer side of the lower header tank (3). Enter the bulge (34B). CO flowing into the rear outward bulge (34B) Flows to the right through the inside, and flows into the refrigerant passages (4a) of all the heat exchange pipes (4) connected to the second outer bulging portion (12B).

[0057] The CO that has flowed into all the heat exchange pipes (4) communicating with the second outer bulge (12B)

2 Change the flow direction and flow upward in the refrigerant passage (4a) and enter the second outer bulging portion (12B) of the upper header tank (2). Thereafter, the CO flows in the second outer bulge portion (12B), and the refrigerant outlet (23)

2

And flows out through the refrigerant outflow passage (26) of the input / output member (24). And CO is a heat exchange tube (

2

While flowing in the refrigerant passage (4a) of 4), the ventilation gap exchanges heat with the air flowing in the direction indicated by the arrow X in FIGS. 1 and 10, and flows out as a gas phase.

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 falls below the lower end of the portion that exists in the side cover (36). Drops below the side header tank (3). The condensed water that has flowed down to the upper surface of the lower header tank (3) falls through the through hole (45X46X44) to the lower side of the lower header tank (3). Here, the inner diameter of the through hole (46) in the intermediate plate (33) in which the inner diameter of the through hole (44) of the header forming plate (31) is larger than the inner diameter of the through hole (45X46) of the other plate (32X33) A flange portion (46a) projecting toward the header portion forming plate (31) side is formed in the peripheral portion, and the flange portion (46a) is formed in the through hole (31) of the header portion forming plate (31). 44) the tube is inserted and expanded, and the peripheral edge of the through hole (45) in the pipe connection plate (32) is projected toward the intermediate plate (33), and the projection (45a) Since it is press-fitted into the through hole (46) of the intermediate plate (33), the condensed water is smoothly drained through the through hole (46X45X44).

[0059] In this way, freezing of condensed water due to 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 evaporator (1) Performance degradation is prevented.

[0060] In the above embodiment, the heat exchanger according to the present invention may be applied to the gas cooler of the supercritical refrigeration cycle, which is not limited to the force applied to the evaporator of the supercritical refrigeration cycle. .

[0061] Figs. 11 to 20 show variations of the heat exchange tube used in the evaporator (1) of the embodiment described above. An example is shown. In the following description, the top, bottom, left and right in FIGS.

[0062] The heat exchange pipe (160) shown in Fig. 11 and Fig. 12 includes flat upper and lower walls (161) and (162) (one pair of flat walls) facing each other, and left and right edges of the upper and lower walls (161X162). A plurality of left and right side walls (163), (164), and left and right side walls (163X164) straddling the upper and lower walls (161X162) and extending in the length direction and spaced apart from each other by a predetermined distance. It comprises a reinforcing wall (165) and has a plurality of refrigerant passages (166) arranged in the width direction inside. Here, the reinforcing wall (165) serves as a partition wall between the adjacent refrigerant passages (166). In addition, the passage width of the refrigerant passage (166) is equal over the entire height.

[0063] The left side wall (163) has a double structure, and is integrally formed in a protruding shape downward from the left edge of the upper wall (161) and has an outer side wall ridge (167) extending over the entire height of the heat exchange pipe (160). The inner side wall ridges (168) formed integrally with the inner wall of the outer side wall ridges (167) so as to protrude downward from the upper wall (161), and are integrally formed with the upper ridges above the left edge of the lower wall (162). Consists of molded inner side wall ridges (169). The outer side wall ridges (167) are brazed to both the inner side wall ridges (168X169) and the lower wall (162) with the lower end engaged with the lower left edge of the lower wall (162). RU The projections for both inner side walls (168X169) are brazed so as to face each other. The right side wall (164) is formed integrally with the upper and lower walls (161X162). A protrusion (169a) extending in the longitudinal direction is integrally formed on the front end surface of the inner side wall ridge (169) of the lower wall (162), and the inner wall ridge (168) of the upper wall (161) is integrally formed. A concave groove (168a) extending in the longitudinal direction and into which the protrusion (169a) is press-fitted is formed over the entire length.

[0064] 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 integrally formed in a raised shape above the lower wall (162). The projecting ridges (171) are formed by being butted against each other.

[0065] The heat exchange tube (160) is manufactured using a metal plate (175) for tube manufacture as shown in Fig. 13 (a). The metal plate for pipe manufacture (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 wall forming section (177) (flat wall forming section), an upper wall forming section (176) and a lower wall forming section (177) connected to each other and forming a right side wall (164); Wall former (176) and An inner side wall ridge (168X169) integrally formed in a raised shape above the side edge of the lower wall forming part (177) opposite to the connecting part (178) and forming the inner part of the left side wall (163); Outer side wall ridge forming part formed by extending the side edge (right side edge) of the upper wall forming part (176) opposite to the connecting part (178) outward in the left-right direction (right side) 179) and a plurality of reinforcing wall ridges (170X171) integrally formed upwardly from the upper wall forming portion (176) and the lower wall forming portion (177) at predetermined intervals in the left-right direction. The reinforcing wall projection (170) of the upper wall forming portion (176) and the reinforcing wall projection (171) of the lower wall forming portion (177) are the center line in the width direction of the connecting portion (178). Is in a position that is symmetrical with respect to. A protrusion (169a) is formed on the tip surface of the inner side wall projection (169) of the lower wall forming portion (177), and a groove is formed on the tip surface of the inner side wall projection (168) of the upper wall forming portion (176). (168a) is formed. The heights of the ridges for both inner side walls (168X169) and all the ridges for reinforcing walls (170X171) are equal. The upper and lower wall thickness of the connecting part (178) is larger than the wall thickness of the upper and lower wall forming part (175X176), and the upper end surface of the connecting part (178) is the inner side wall protrusion (168X169) and the reinforcing wall protrusion. It is almost flush with the upper end surface of (170X171).

[0066] In addition, the aluminum brazing sheet clad with the brazing material on both sides is subjected to rolling, so that the side wall ridges (168X169) and the reinforcing wall ridges (170X171) are integrally formed on one side. As a result, brazing filler metal layers (not shown) are formed on both side surfaces and front end surfaces of the side wall ridges (168X169) and the reinforcing wall ridges (170X171) and on the upper and lower surfaces of the upper and lower wall forming portions (176X177).

[0067] Then, the metal plate for tube production (175) is bent sequentially at the left and right side edges of the connecting portion (178) by roll forming method (see FIG. 13 (b)) and finally bent into a hairpin shape. The inner side wall ridges (168X169) and the reinforcing wall ridges (170X171) are butted together, and the protrusions (169a) are press-fitted into the grooves (168a).

[0068] Thus, the outer side wall ridge forming portion (179) is bent so as to be along the outer surface of the both inner side wall ridges (168) (169), and the tip portion thereof is deformed to be lowered. The folded body (180) is obtained by engaging with the wall forming portion (177) (see FIG. 13 (c)).

[0069] After that, the bent body (180) is heated to a predetermined temperature, and the tips of the inner side wall ridges (168X169) and the reinforcing wall ridges (170X171) are brazed to each other. Then, the heat exchange pipe (160) is manufactured by brazing the outer side wall ridge forming part (179), the both inner side wall ridges (168X169) and the lower wall forming part (177). The heat exchange pipe (160) is manufactured at the same time as the evaporator (1).

[0070] In the case of the heat exchange pipe (185) shown in FIG. 14, the protrusions (186) extending over the entire length and the recesses extending over the entire length are formed on the front end surfaces of all the reinforcing wall protrusions (170) on the upper wall (161). The grooves (187) are alternately formed. In addition, the protrusions of the reinforcing wall projections (170) of the upper wall (161) that are abutted against the tip surfaces of all the reinforcing wall projections (171) of the lower wall (162) (186) The concave groove (188) into which the upper wall (161) is fitted and the protrusion (189) to be fitted into the concave groove (187) of the reinforcing wall convex strip (170) 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.

[0071] In the heat exchange pipe (190) shown in FIGS. 15 and 16, the reinforcing wall projection (191) integrally formed in a protruding shape downward from the upper wall (161) is brazed to the lower wall (162). The reinforcing wall (165) and the reinforcing wall projection (192) integrally formed in a raised shape above the lower wall (162) are brazed to the upper wall (161) (165) ) Are alternately provided in the left-right direction, and the protrusions (193) that extend over the entire length of the other wall of the upper and lower walls (161X162) are in contact with the ridges (192X191) on the other wall. A concave groove (194) is formed on the front end surface of the projection (193) to fit the tip of the reinforcing wall projection (191X192), and the tip of the reinforcement wall projection (191X192) is a projection (193 ) Is recessed in the groove (194) 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 projection (191X192). Other configurations are the same as those of the heat exchange pipe (160) shown in FIGS.

[0072] The heat exchange tube (190) is manufactured using a metal plate (195) for tube manufacture as shown in Fig. 17 (a). The metal plate (195) for manufacturing a tube 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. It is provided with a plurality of reinforcing wall ridges (191X192) integrally formed in a raised shape from the lower wall forming portion (177), respectively, and the reinforcing wall ridges (191) of the upper wall forming portion (176) The reinforcing wall projection (192) of the lower wall forming portion (177) is in a position that is asymmetric with respect to the center line in the width direction of the connecting portion (178). The heights of the ridges for both reinforcing walls (191X192) are equal to each other and about twice the height of the ridges for inner side walls (168X169). The upper wall forming part (17 6) Reinforcement of the lower wall forming part (177) and the upper wall forming part (176) in the lower wall forming part (177) The protrusion (193) extending over the entire length is in contact with the wall projection (192X191) A concave groove (194) is formed on the front end surface of the protrusion (193) to fit the front end of the reinforcing wall projection (192X191). The other structure of the metal plate for pipe manufacture (195) is the same as that of the metal plate for pipe manufacture (175) shown in FIG.

[0073] Then, the metal plate for tube production (195) is sequentially bent at the left and right side edges of the connecting portion (178) by the roll forming method (see FIG. 17 (b)), and finally bent into a hairpin shape. The ridges (168X169) for the inner side wall are brought into contact with each other and the protrusion (169a) is press-fitted into the groove (168a), and the tip of the reinforcing wall ridge (191) on the upper wall forming part (176) is The tip of the reinforcing wall projection (192) of the lower wall forming portion (177) is inserted into the groove (194) of the protrusion (193) of the lower wall forming portion (177) of the upper wall forming portion (176). Fit into the groove (194) of the protrusion (193).

[0074] Thus, the outer side wall ridge forming portion (179) is bent so as to be along the outer surface of the both inner side wall ridges (168) (169), and the tip portion thereof is deformed and lowered. The folded body (196) is obtained by engaging with the wall forming portion (177) (see FIG. 17 (c)).

[0075] After that, the bent body (196) is heated to a predetermined temperature to braze the tips of the inner side wall ridges (168X169) and to project the tip of the reinforcing wall ridges (191X192). ) And brazing the outer side wall ridges (179), both inner side ridges (168X169) and the lower wall forming part (177), so that the heat exchange pipe (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) has a reinforcing wall projection (201X202) integrally formed in a raised shape below the upper wall (161), Reinforcing wall projections (203X204) integrally formed in a protruding shape above the lower wall (162) are formed by being abutted against each other and brazed. On the upper wall (161) and the lower wall (162), two types of reinforcing wall projections (201X202X203X204) with different protrusion heights are formed alternately in the left-right direction. The protruding ridge for reinforcing wall (201) with high protruding height and the protruding ridge for reinforcing wall (204) with low protruding height on the lower wall (162) are brazed, and the protruding height on the upper wall (161) is low. The ridges for reinforcing walls (202) and the ridges for reinforcing walls (203) having a high protruding height on the lower wall (162) are brazed. Hereafter, the projecting ridges (201X203) for reinforcing walls with high projecting height of the upper and lower walls (161X162) are used. The first reinforcing wall ridges and!,, And the same low reinforcing wall ridges (202X204) shall be the second reinforcing wall ridges, respectively. Extends in the longitudinal direction on the tip surface of the second reinforcing wall projection (202X204) on both the upper and lower walls (161X162) and the tip of the first reinforcement wall projection (203) (201) on the other wall (162X161) The groove (205X206) that fits the part is formed over the entire length, and the tip of the first reinforcing wall projection (201X203) on both the upper and lower walls (161X162) is fitted in the groove (206X205) Thus, both reinforcing wall projections (201X204) and (202X203) are brazed. Other configurations are the same as those of the heat exchange pipe (160) shown in FIGS.

[0077] The heat exchange pipe (200) is manufactured using a metal plate (210) for pipe manufacture as shown in Fig. 20 (a). The metal plate for pipe production (150) is formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides. The upper wall forming portion (176) and the lower wall are formed at predetermined intervals in the left-right direction. A plurality of reinforcing wall ridges (201X202X203X204) integrally formed in a protruding shape upward from the wall forming portion (177), and the first reinforcing wall ridge (201) of the upper wall forming portion (176). And the second reinforcing wall ridge (204) of the lower wall forming portion (177), and the second reinforcing wall ridge (202) of the upper wall forming portion (176) and the first of the lower wall forming portion (177). The reinforcing wall ridges (203) are in positions symmetrical with respect to the center line in the width direction of the connecting portion (178). On the tip of the second reinforcing wall projection (202X204) of the upper wall forming part (176) and lower wall forming part (177) is the first reinforcing wall protruding line (203X201) of the other wall forming part (177X176). ) Is formed in the groove (205X206) into which the front end of) fits.

[0078] The aluminum brazing sheet clad with the brazing material on both sides is subjected to rolling force, and the reinforcing wall projections (201X202X203X204) are formed on one side of the aluminum brazing sheet. A brazing filler metal layer (not shown) is formed on both side surfaces and the front end surface of the protrusion (201X202X203X204) and the inner peripheral surface of the groove (205X206) of the second reinforcing protrusion (202X204). 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.

[0079] Then, the metal plate (210) for manufacturing the tube 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. The inner side wall ridges (168X169) face each other, and the tip of the first reinforcement wall ridge (201X203) is fitted into the groove (206X205) of the second reinforcement wall ridge (204X202). Press the protrusion (169a) into the groove (168a). [0080] Thus, the outer side wall ridge forming portion (179) is bent so as to be along the outer surfaces of the both inner side wall ridges (168) and (169), and the tip portion thereof is deformed to be lowered. The folded body (215) is obtained by engaging with the wall forming section (177) (see FIG. 20 (c)).

[0081] After that, the bent body (215) is heated to a predetermined temperature, the tip portions of the inner side wall ridges (168X169), the first reinforcing wall ridges (201X203) and the second reinforcing wall ridges ( 204X202) by brazing the tip portions of the outer side wall, and brazing the outer side wall convex strip forming portion (179), both inner side wall convex strips (168X169) and the lower wall forming portion (177), A heat exchange tube (200) is produced.

Industrial applicability

[0082] In the heat exchange of the present invention, for example, a supercritical refrigerant such as CO (diacid carbon) is used.

2

It is preferably used for a gas cooler or an evaporator of a supercritical refrigeration cycle.

Brief Description of Drawings

FIG. 1 is a partially omitted perspective view showing an overall configuration of an evaporator to which heat exchange according to the present invention is applied.

FIG. 2 is a vertical sectional view showing a part of the evaporator shown in FIG.

FIG. 3 is a cross-sectional view taken along line AA in FIG.

FIG. 4 is an enlarged sectional view taken along line BB in FIG. 2 with a part omitted.

FIG. 5 is an exploded perspective view showing a right end portion of the upper header tank in the evaporator of FIG. 1.

FIG. 6 is an enlarged cross-sectional view taken along line CC in FIG.

7 is an exploded perspective view showing a method for manufacturing the upper header tank of the evaporator in FIG. 1. FIG.

8 is an exploded perspective view showing a method for manufacturing the lower header tank of the evaporator in FIG. 1. FIG.

FIG. 9 is an enlarged cross-sectional view of a main part showing a manufacturing method of both header tanks of the evaporator of FIG. 1.

FIG. 10 is a diagram showing a refrigerant flow in the evaporator of FIG. 1.

FIG. 11 is a cross-sectional view showing a first modification of the heat exchange tube.

FIG. 12 is a partially enlarged view of FIG. FIG. 13 is a diagram showing a method for manufacturing the heat exchange tube shown in FIG. 14] A cross-sectional view showing a second modification of the heat exchange tube. FIG. 15 is a cross-sectional view showing a third modification of the heat exchange tube.

FIG. 16 is a partially enlarged view of FIG.

FIG. 17 is a diagram showing a manufacturing method of the heat exchange tube shown in FIG. FIG. 18 is a transverse cross-sectional view showing a fourth modification of the heat exchange tube.

FIG. 19 is a partially enlarged view of FIG.

FIG. 20] A diagram showing a method for manufacturing the heat exchange tube shown in FIG.

Claims

The scope of the claims

[1] A pair of header tanks spaced apart from each other, and a plurality of header tanks spaced between the header tanks in the length direction of the header tanks and having both ends connected to both header tanks. Heat exchange with heat exchange pipes ^^

Each header tank force The header part forming plate, the pipe connecting plate, and the intermediate plate interposed between these two plates are laminated and brazed to each other. And at least one outward bulging portion extending in the length direction and having the opening closed by the intermediate plate is formed at a position that matches each other on the header portion forming plate, the intermediate plate, and the pipe connecting plate. Each of the through holes is formed, and these plates are brazed to each other with the plates 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 of being caulked around the entire periphery of the through hole. Outline

[3] A flange portion projecting toward the other plate is integrally formed on the peripheral edge portion of the through hole in one of the header portion forming plate and the intermediate plate, and 3. The heat exchange outline according to claim 2, wherein the flange portion is inserted into the through hole of the other plate and is expanded, whereby the three plates are crimped.

[4] A flange portion that protrudes toward the header forming plate is formed integrally with the peripheral portion of the through hole in the intermediate plate, and this flange portion is inserted into the through hole of the header forming plate and expanded. 4. The heat exchanger according to claim 3, wherein a peripheral edge portion of the through hole in the pipe connecting plate is protruded toward the intermediate plate and is press-fitted into the through hole of the intermediate plate.

[5] The heat exchange outline according to claim 4, wherein one of the header tanks is arranged so that the other is at the top and the other is at the bottom.

[6] A plurality of tube insertion holes are formed in the portion corresponding to the outward bulging portion of the pipe connection plate in a penetrating manner at intervals in the length direction of the pipe connection plate. Contact Connect each pipe insertion hole of the connecting plate to the outward bulging part of the header forming plate. The communication hole is formed in a penetrating shape, and both ends of the heat exchange pipe are connected to the pipe connecting plate of both header tanks. The heat exchanger according to claim 1, wherein the heat exchanger is inserted into the tube insertion hole and brazed to the tube connection plate.

[7] A plurality of outward protruding portions extending in the length direction are formed on the header portion forming plate at intervals in the width direction, and the width in the header portion forming plate, the intermediate plate, and the pipe connecting plate is formed. 2. The heat exchanger according to claim 1, wherein a plurality of through holes are formed at intervals between the outward projecting portions adjacent to each other in the length direction of the plates.

[8] 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. Similarly, two outward bulging portions arranged at intervals in the width direction on the header portion forming plate in the second header tank are adjacent to each other in the length direction of the first header tank. Formed to straddle the exit,

In the first header tank, a communication hole in the intermediate plate that communicates with one of the two outer bulges of the two outer bulges arranged in the width direction. The communication hole of the intermediate plate that communicates with the other outward bulge part is communicated by the communication part for the coolant turn formed in the intermediate plate, so that the two outward bulge parts communicate with each other. 8. A heat exchanger according to claim 7 which is combined!

[9] A method of manufacturing the heat exchanger according to claim 1,

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 pipe connecting plate Prepare an intermediate plate with a through hole of the same size at a position that matches the through hole and a flange that can be inserted into the through hole of the header forming plate at the periphery of the through hole. To do,

The three plates have matching through holes and the flange part of the intermediate plate is the header part. Inserted in the through hole of the forming plate and stacked so that the intermediate plate comes to the middle part,

Temporarily fix the header forming plate, intermediate plate and pipe connecting plate at the edge of the through hole;

[10] The mold for expanding the pipe, which has an outer shape that is larger than the through holes of the pipe connection plate and the intermediate plate and smaller than the through holes of the header forming plate. Is pressed into the through-holes of all the plates so that the peripheral edge of the through-holes in the pipe-connecting plate protrudes toward the intermediate plate and press-fits into the through-holes of the intermediate plate. The method for producing a heat exchanger according to claim 9, wherein the flange portion of the plate is expanded.

[11] This refrigeration cycle is equipped with an intermediate heat exchanger that exchanges heat between the refrigerant coming out of the compressor, gas cooler, evaporator, decompressor, and gas cooler and the refrigerant coming out of the evaporator, and uses supercritical refrigerant. A supercritical refrigeration cycle in which the evaporator is a heat exchange according to any one of claims 1 to 8.

[12] A vehicle equipped with the supercritical refrigeration cycle according to claim 11 as a car air conditioner.