JP2010019436A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of reducing manufacturing costs. <P>SOLUTION: A gas cooler applying the heat exchanger, includes a pair of header tanks 2, a heat exchanging pipe 4 disposed between both header tanks 2, and an inlet member 7 and an outlet member 8 joined to the header tanks 2. The header tanks 2 are respectively composed of tank main bodies 11, and pipe connection plates 12 covering surfaces faced to a heat exchanging pipe 4 side, of the tank main bodies 11, and joined to the tank main bodies 11. Projecting walls 22 projecting to the tank main bodies 11 side along both side faces in the ventilating direction of the tank main bodies 11 are formed on both side edge sections in the ventilating direction of the pipe connection plates 12. Holding walls 24 projecting to an outer side with respect to the tank main bodies 11, at their tip sections, are disposed on both projecting walls 22 of the pipe connection plates 12. The inlet member 7 and the outlet member 8 are joined to the header tanks 2 while being held by the holding walls 24 of both projecting walls 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a heat exchanger, and more particularly to a heat exchanger used in a supercritical refrigeration cycle in which a supercritical refrigerant such as CO ₂ is used.

  In this specification, the “supercritical refrigeration cycle” means a refrigeration cycle in which the refrigerant reaches a supercritical state exceeding the critical pressure on the high-pressure side, and the “supercritical refrigerant” means the supercritical refrigeration cycle. It shall mean the refrigerant used in

  As a heat exchanger used in a gas cooler of a supercritical refrigeration cycle having a compressor, a gas cooler, an evaporator, a decompressor, and an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the gas cooler and the refrigerant that has come out of the evaporator, The present applicant has previously made a pair of header tanks spaced apart from each other, and a flat shape in which both header tanks are arranged in parallel with a gap between both header tanks. A heat exchange pipe and fins disposed in a ventilation gap between adjacent heat exchange pipes and brazed to the heat exchange pipe, and each header tank has a tank body and a heat exchange pipe side in the tank body. A pipe connecting plate that covers the facing surface, the first header tank is provided with an inlet header portion and an outlet header portion, and the second header tank is provided with a first header tank. One intermediate header portion is provided so as to straddle the two header portions of the tank, and an inlet member for allowing the refrigerant to flow into the inlet header portion on the surface of the tank body of the first header tank facing the side opposite to the heat exchange pipe A heat exchanger has been proposed in which an (accessory part) and an outlet member (accessory part) for allowing the refrigerant to flow out from the outlet header are brazed (see Patent Document 1).

The heat exchanger described in Patent Document 1 is manufactured by assembling and temporarily fixing all parts including the inlet member and the outlet member, and brazing all the parts together in this state. Usually, the temporary fixing of the inlet member and the outlet member is performed by partially welding the outer surface of the outer plate. However, when the inlet member and the outlet member are temporarily fixed to the outer plate by partial welding, there are problems that the number of steps increases and a dedicated jig is required, resulting in an increase in manufacturing cost.
JP-A-2005-300135

  An object of the present invention is to provide a heat exchanger that can solve the above problems and can reduce the manufacturing cost.

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

1) A pair of header tanks spaced from each other, a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks, and joined to the header tank Each header tank is composed of a tank body and a pipe connecting plate that covers the surface of the tank body facing the heat exchange pipe side and is joined to the tank body. In the heat exchanger in which the protruding walls along the both sides of the tank body in the ventilation direction are formed on both side edges of the plate for ventilation in the ventilation direction,
Both projecting walls of the pipe connection plate are provided with a clamping part whose tip protrudes to the outside of the tank body, and the accessory parts are joined to the header tank while being clamped by the clamping parts of both projecting walls. Heat exchanger.

  2) The length in the length direction of the header tank at the sandwiched portions of both protruding walls of the pipe connection plate is longer than the length in the same direction of the accessory parts, and a part of the length of both sandwiched portions The heat exchanger as described in 1) above, wherein the attached part is sandwiched by the heat exchanger.

  3) On the both sides of the ventilation direction of the accessory parts, there are provided inclined surfaces that are inclined inward in the ventilation direction toward the length of the heat exchange pipe. The heat exchanger as described in 1) or 2) above, wherein an inclined portion that is in close contact with the inclined surface of the accessory is provided.

  4) The above 1) to 3), wherein the tank body is composed of a first plate located outside and a second plate that is interposed between the first plate and the pipe connecting plate and brazed to both plates. The heat exchanger in any one of.

  According to the heat exchanger of 1) above, the both projecting walls of the pipe connecting plate are provided with a sandwiching portion with the tip projecting outward from the tank body, and the accessory part is a sandwiching portion of both projecting walls. Since it is joined to the header tank in a state of being sandwiched by, at the time of manufacture, on both projecting walls of the pipe connection plate, a projecting piece for forming a sandwiching portion connected to both projecting walls is formed, After placing the accessory part on the outer surface of the tank body, both the sandwiching part forming projections are pressed against the accessory part side to form the sandwiching part, and by sandwiching the accessory part by both sandwiching parts, Attached parts can be temporarily fixed to the tank body. Therefore, as in the case of the heat exchanger described in Patent Document 1, it is not necessary to temporarily fix the accessory parts by partial welding, the number of steps is reduced, and a dedicated jig is not required, so that the manufacturing cost is low. Become.

  According to the heat exchanger of 2) above, the length in the length direction of the header tank at the sandwiched portion of both protruding walls of the pipe connection plate is longer than the length in the same direction of the accessory parts. Since the accessory part is clamped by a part of the clamping part in the length direction, the accessory part can be temporarily fixed at an arbitrary position within the range of the header tank in the length direction of the clamping part.

  According to the heat exchanger of 3) above, the inclined surfaces inclined inward in the ventilation direction toward the length direction of the heat exchange pipe are provided on both side surfaces of the accessory part in the ventilation direction, and the pipe connection plate Since the inclined portions that are in close contact with the inclined surfaces of the accessory parts are provided in the sandwiching portions of the two protruding walls, the accessory parts can be firmly fixed temporarily during manufacture.

  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 a gas cooler of a supercritical refrigeration cycle, and an inlet member and an outlet member of a refrigerant, and a bracket used to attach the gas cooler to a vehicle are a header tank. It is an accessory part joined to.

  In the following description, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIG. 1) is referred to as the front, the opposite side is referred to as the rear, and the upper and lower sides and the left and right sides in FIGS. And

  Furthermore, in the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  1 and 2 show the overall configuration of a gas cooler to which a heat exchanger according to the present invention is applied, and FIGS. 3 and 4 show the configuration of the main part thereof. 5 and 6 show some steps of the method of manufacturing the gas cooler.

1 to 4, a gas cooler (1) of a supercritical refrigeration cycle using a supercritical refrigerant, for example, CO ₂ , has two header tanks (2) (2) ( 3) and a plurality of flat heat exchange pipes (4) arranged between the header tanks (2) and (3) in the vertical direction and with the width direction oriented in the front-rear direction, and adjacent heat exchange Corrugated fins (5) arranged outside the heat exchange pipe (4) at the upper and lower ends and brazed to the heat exchange pipe (4), and corrugated fins at the upper and lower ends. The aluminum side plate (6) disposed on the outside of (5) and brazed to the corrugated fin (5), the refrigerant inlet member (7) brazed to the right header tank (2), and the like. The outlet member (8) and each header tank (2) (3) are brazed and the gas cooler (1) is attached to the vehicle And a bracket (9) used for the above. In this embodiment, the right header tank (2) is referred to as a first header tank, and the left header tank (3) is referred to as a second header tank.

  The first header tank (2) is formed of an aluminum tank body (11) and a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and covers the left side surface of the tank body (11). A pipe connecting plate (12) brazed to the tank body (11), and an inlet header portion (13A) whose inside is a refrigerant flow path (13a) and a refrigerant flow path (13b) inside. The exit header portions (13B) thus formed are provided side by side.

  The tank body (11) includes a first plate (11A) formed from a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and disposed on the right side (outside), and a metal bare material, here aluminum. Consists of a second plate (11B) made of bare material and interposed between the first plate (11A) and the pipe connection plate (12) and brazed to both plates (11A) (12) Has been. An outwardly bent portion (11a) having a substantially U-shaped cross section that opens to the left side (second plate (11B) side) is formed at the center in the front-rear direction of the first plate (11A). The opening facing the left side of the fold portion (11a) is closed by the second plate (11B). Further, both front and rear side portions of the outward bent portion (11a) of the first plate (11A) are flat portions (11b) positioned in the same plane. The upper and lower ends of the tank body (11) and the central portion in the vertical direction are filled with an internal space (14) extending in the vertical direction in the outward bent portion (11a) of the first plate (11A) and open at both upper and lower ends. A partition plate (15) is disposed across both plates (11A) and (11B). Then, the upper and lower end openings of the internal space (14) are closed by the partition plate (15), and the inner space (14) is vertically separated by the partition plate (15) at the center in the vertical direction (14A) (14B). It is divided into.

  Through holes (16) that are long in the front-rear direction and extend from one flat portion (11b) to the other flat portion (11b) are formed in the upper and lower ends and the vertical center of the first plate (11A). Yes. Further, a refrigerant inlet (17) is formed at a position slightly below the through hole (16) at the upper end at the top of the outwardly bent portion (11a) of the first plate (11A), and the first plate (11A The inlet member (7) having the refrigerant inflow passage (18) leading to the refrigerant inlet (17) is brazed to the outer surface of the first plate (11A) using the brazing material on the outer surface of the first plate (11A). A refrigerant outlet (19) is formed at a position slightly above the through hole (16) at the lower end at the top of the outer bent portion (11a), and the refrigerant outlet is formed on the outer surface of the first plate (11A). An outlet member (8) having a refrigerant outflow path (21) leading to (19) is brazed using a brazing material on the outer surface of the first plate (11A). The first plate (11A) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The right and left side edges of the pipe connection plate (12) of the first header tank (2) protrude rightward and the tip reaches the outer surface of the first plate (11A). Protruding walls (22) that cover the entire front and rear side surfaces of the first plate (11A) and the second plate (11B) are integrally formed, and the front and rear side surfaces of the first plate (11A) and the second plate (11B) are brazed. It is attached. The upper and lower ends of the protruding edge of each protruding wall (22) and the central portion in the vertical direction, that is, the position corresponding to each through hole (16), protrudes inward in the front-rear direction and on the outer surface of the first plate (11A). The engaging claw (23) to be engaged is integrally formed, and the engaging claw (23) is brazed to the first plate (11A). The engaging claw (23) covers both front and rear ends of the through hole (16) of the first plate (11A). As shown by the solid line in FIGS. 5 and 6, the engaging claw (23) is straightly connected to the protruding wall (22) before the three plates (11A), (11B), and (12) are combined. Extend outward in the left-right direction. A straight engaging claw-forming projecting piece is indicated by (23A). Further, between the engaging claws (23) at the upper and lower end portions and the engaging claws (23) at the central portion in the vertical direction, the inlet member (7) and the outlet member are respectively provided at the protruding end edges of the protruding walls (22). A clamping wall (24) (clamping) that is longer than the length of (8) in the vertical direction (the length direction of the header tank (2)) and clamps the inlet member (7) and the outlet member (8) from the front-rear direction. (Attachment part) is formed integrally.

  In the pipe connecting plate (12) of the first header tank (2), a plurality of penetrating pipe insertion holes (25) that are long in the front-rear direction are formed at intervals in the vertical direction. A plurality of pipe insertion holes (25) in the upper half are formed in the vertical range of the upper part (14A) in the internal space (14) of the first plate (11A) of the tank body (11), and The plurality of half tube insertion holes (25) are formed in the vertical range of the lower portion (14B) in the internal space (14) of the first plate (11A) of the tank body (11). The length in the front-rear direction of the tube insertion hole (25) is slightly longer than the width in the front-rear direction of the outer bent portion (11a), and both front and rear end portions of the tube insertion hole (25) are formed in the outer bent portion (11a). Projects outward from both front and rear edges. The pipe connecting plate (12) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The second plate (11B) of the tank body (11) of the first header tank (2) is long in the front-rear direction and has a pipe insertion hole (25) of the pipe connection plate (12). A plurality of communication holes (26) communicating with the upper and lower side portions (14A) (14B) of the internal space (14) of one plate (11A) are formed in a penetrating manner. Each communication hole (26) is slightly larger than the tube insertion hole (25). In addition, all the communication holes (26) leading into the upper part (14A) of the internal space (14) are cut out in the center in the front-rear direction of the part between the adjacent communication holes (26) in the second plate (11B). The communication portion (27) formed by the communication is connected, and the center portion in the front-rear direction of all the communication holes (26) communicating with the upper portion (14A) and the communication holes (26) are communicated. The communication part (27) forms a refrigerant circulation part (28) through which the refrigerant flows in the vertical direction on the second plate (11B). In addition, all the communication holes (26) communicating with the lower part (14B) of the internal space (14) are respectively located in the center in the front-rear direction of the part between the adjacent communication holes (26) in the second plate (11B). The communicating part (27) formed by excision communicates with the central part in the front-rear direction of all the communicating holes (26) communicating with the lower part (14B), and these communicating holes (26). The communication part (27) for communication forms a refrigerant circulation part (29) through which the refrigerant flows in the vertical direction on the second plate (11B).

  The tank body (11) is long and through-holes in the front-rear direction so as to correspond to the through-holes (16) of the first plate (11A) at the upper and lower ends and the vertical center of the second plate (11B). A through hole (31) having the same width and length as (16) is formed. Through the through hole (16) of the first plate (11A) and the through hole (31) of the second plate (11B), a penetrating partition plate insertion hole (32) is formed in both plates (11A) in the tank body (11). ) (11B). By inserting the partition plate (15) into each partition plate insertion hole (32), the upper and lower ends of the first plate (11A) and the second plate (11B) of the tank body (11) and the center in the vertical direction A partition plate (15) is disposed in the part.

  The partition plate (15) is formed of an aluminum brazing sheet having a brazing filler metal layer on both sides, and the outer edge is flush with the outer surface of the first plate (11A) in the partition plate insertion hole (32). And both front and rear ends thereof are pressed from the outside in the left and right direction by the engaging claws (23). In this state, the front and rear side edges of the partition plate (15) are the first plate (11A) and The second plate (11B) is brazed, the inner edge in the left-right direction is brazed to the pipe connection plate (12), and the upper and lower surfaces of the partition plate (15) are the first plate (11A) and the second plate ( 11B), and the front end of the engaging claw (23) is brazed to the front and rear ends of the outer edge of the partition plate (15).

  The inlet header portion (13A) of the first header tank (2) includes a tank body (11) and a pipe connection plate (12), that is, a first plate (11A), a second plate (11B), and a pipe connection plate ( 12), the outlet header (13B) is formed by the upper part of the partition plate (15) at the center in the vertical direction. Similarly, the outlet header (13B) has the tank body (11) and the pipe connection plate (12), that is, the first plate ( 11A), the second plate (11B), and the pipe connection plate (12) are formed by portions below the partition plate (15) at the center in the vertical direction. The refrigerant flow paths (13a) and (13b) of the inlet header portion (13A) and the outlet header portion (13B) of the first header tank (2) are the upper and lower side portions of the internal space (14) of the first plate (11A) ( 14A) (14B) and upper and lower refrigerant circulation portions (28), (29) of the second plate (11B).

  The inlet member (7) and the outlet member (8) have a block shape made of metal, here an aluminum bare material. The front and rear widths of the left side portions (7a) and (8a) of the inlet member (7) and the outlet member (8) are narrower than the front and rear widths of the right side portions (7b) and (8b), respectively. Both front and rear end portions of (7b) and (8b) protrude outward in the front-rear direction from the left side portions (7a) and (8a). The left side surface of the left part (7a) (8a) of the inlet member (7) and outlet member (8) facing the tank body (11) is the width in the front-rear direction of the first plate (11A) of the tank body (11). Are in close contact with the outer surface of the first plate (11A). Most of the left side portion (7a) (8a) of the left side portion (7a) (8a) of the inlet member (7) and the outlet member (8) except for the portion near the left side portion (7a) (8a) Inclined surfaces (33) and (34) inclined inward in the direction are formed. The inclined surfaces (33) and (34) of the inlet member (7) and the outlet member (8) are at the same position in the left-right direction. One end of the refrigerant inflow path (18) of the inlet member (7) opens to the left side surface of the left side portion (7a), and the other end opens to the rear side surface of the right side portion (7b). One end of the refrigerant outflow path (21) of the outlet member (8) opens to the left side surface of the left side portion (8a), and the other end opens to the rear side surface of the right side portion (8b). The inlet member (7) and the outlet member (8) are clamped from the front and rear by a part in the vertical direction (length direction) of the clamping wall (24) of the pipe connection plate (12). The brazing material layer of the first plate (11A) of one header tank (2) is brazed to the outer surface of the first plate (11A). Most of the right side of the clamping wall (24) is inward in the front-rear direction so as to be in close contact with the front and rear inclined surfaces (33) (34) of the inlet member (7) and outlet member (8). It is inclined to. The inclined portion (35) is formed over the entire length of the sandwiching wall (24). 5 and 6, the entire sandwiching wall (24) is straight to the protruding wall (22) before the three plates (11A) (11B) (12) are combined. Extends outward in the left-right direction. A straight clamping wall forming protrusion is indicated by (24A).

  FIG. 3 is a cross-sectional view of the inlet member (7). Since the shapes of the portions (8a), (8b) and (34) of the outlet member (8) are the same as those of the inlet member (7), FIG. Reference numerals of the portions (8a), (8b), and (34) of the outlet member (8) are attached in parentheses.

  The bracket (9) is formed integrally with the block-shaped base portion (36) and the right end edge of the rear side surface of the base portion (36) so as to protrude forward, and the bolt for attaching the gas cooler (1) to the vehicle body, It comprises an attachment portion (37) having a through hole (38) through which a fastener such as a screw is passed. An inclined surface (39) that is inclined inward in the front-rear direction toward the right is formed in the intermediate portion in the left-right direction on both front and rear side surfaces of the base portion (36). The inclined surface (39) of the bracket (9) is in the same position as the inclined surfaces (34) and (35) of the inlet member (7) and the outlet member (8) in the left-right direction, and the lower clamping wall (24) The inclined portion (35) is in close contact. The bracket (9) is clamped from the front and rear by the clamping wall (24) of the pipe connection plate (12), and the inclined portion (35) is in close contact with the inclined surface (39). The outer surface of the first plate (11A) of the header tank (2) is brazed using the brazing material layer of the first plate (11A).

  As shown in FIG. 2, the second header tank (3) has substantially the same configuration as the first header tank (2), and the same components and the same parts are denoted by the same reference numerals. Both header tanks (2) and (3) are arranged so that the pipe connecting plates (12) face each other.

  The first plate (11A) and the second plate (11B) of the second header tank (3) are provided with the partition plates (15) only at the upper and lower ends, and the first plate (11A) of the tank body (11). In the internal space (14), only the upper and lower end openings are closed by the partition plate (15) and are not partitioned vertically. Moreover, all the pipe insertion holes (25) of the pipe connection plate (12) of the second header tank (3) are formed within the upper and lower ranges of the internal space (14) of the first plate (11A). All the pipe insertion holes (25) of the pipe connection plate (12) are connected to the first plate (11A) of the tank body (11) through all the communication holes (26) of the second plate (11B). It is connected to the internal space (14). All the communication holes (26) of the second plate (11B) are formed by cutting the central part in the front-rear direction of the portion between the adjacent communication holes (26) in the second plate (11B) (27 ). As a result, a refrigerant circulation part (41) through which the refrigerant flows in the vertical direction is formed in the second plate (11B) by the communication part (27) and the central part in the front-rear direction of the communication hole (26). Therefore, the inside of the second header tank (3) is a refrigerant flow path (42a) so as to straddle the inlet header portion (13A) and the outlet header portion (13B) of the first header tank (2). Two intermediate header portions (42) are formed. The intermediate header portion (42) of the second header tank (3) is formed by the entire first plate (11A), pipe connection plate (12), and second plate (11B). The refrigerant flow path (42a) of the intermediate header portion (42) includes a portion between the upper and lower partition plates (15) in the internal space (14) of the first plate (11A) of the tank body (11) and the second plate. (11B) refrigerant distribution section (41).

  Note that the refrigerant inlet and the refrigerant outlet are not formed in the outward bent portion (11a) of the first plate (11A) of the second header tank (3).

  In addition, the bracket (9) is attached to the upper end of the second header tank (3) using the upper clamping wall (24) and the inclined portion (35), and the bracket (9) of the first header tank (2). ) And brazed in the same way.

  Since the accessory parts are not joined to the lower side of the second header tank (3), the pipe connection plate (12) has a clamping wall forming projection piece that is straightly connected to the protruding wall (22). (24A) remains as it is.

  The heat exchange pipe (4) is made of an extruded shape made of metal, here aluminum, and has a flat shape that is wide in the front-rear direction, and a plurality of refrigerant passages (4a) extending in the length direction are formed in parallel in the inside. ing. Both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (25) of the header tanks (2) and (3), respectively, using the brazing material layer of the pipe connection plate (12). It is brazed to the pipe connection plate (12). Note that both ends of the heat exchange pipe (4) enter the communication hole (26) to the middle part in the thickness direction of the second plate (11B), and the inlet header part (13A), outlet header part (13B) and It is located in the refrigerant flow path (13a) (13b) (42a) of the intermediate header part (42). All the heat exchange pipes (4) have a right end portion which leads to a refrigerant flow path (13a) of an inlet header portion (13A) of the first header tank (2) and a left end portion which is an intermediate header of the second header tank (3). An upper heat exchange pipe group consisting of a plurality of heat exchange pipes (4) communicating with the upper half of the refrigerant flow path (42a) of the section (42), and an outlet header section (13B) of the first header tank (2) at the right end. ) From the plurality of heat exchange pipes (4) leading to the refrigerant flow path (13b) and the left end portion leading to the lower half of the refrigerant flow path (42a) of the intermediate header part (42) of the second header tank (3). It is divided into a lower heat exchange tube group.

  The gas cooler (1) is manufactured by combining all the parts, temporarily fastening them with appropriate means, and brazing them together.

  Hereinafter, at the time of manufacturing the gas cooler (1), the three plates (11A) (11B) (12) are temporarily fixed, the partition plate (15) is temporarily fixed, the inlet member (7) is temporarily fixed, and the outlet member (8) is temporarily fixed. The temporary fixing and temporary fixing of the bracket (9) will be described with reference to FIG. 5 and FIG. The pipe connection plate (12) before temporary fixing is not formed with bent engagement claws (23) and inclined portions (35), and the engagement claws are straightly connected to the protruding wall (22). A forming protrusion (23A) and a sandwiching wall forming protrusion (24A) are formed.

  In the case of the first header tank (2), first, three plates (11A) (11B) (12) are combined in a laminated form. Next, the partition plate (15) is inserted from the outside into the partition plate insertion hole (32) including the through holes (16) and (31) of the first and second plates (11A) and (11B). Further, the inlet member (7), the outlet member (8) and the bracket (9) are arranged at predetermined positions. Next, both the sandwiching wall forming protrusions (24A) of the pipe connecting plate (12) are pressed inward in the front-rear direction to form two upper and lower sandwiching walls (24) having inclined portions (35), and the upper side The left side portion (7a) of the inlet member (7) is clamped from both the front and rear sides by the clamping wall (24), and the inclined portion (35) is brought into close contact with the inclined surface (34) to temporarily fix the inlet member (7). At the same time, the lower part clamping wall (24) sandwiches the left side part (8a) of the outlet member (8) and the base part (36) of the bracket (9) from both the front and rear sides, and the inclined part (35) is inclined. (34) The outlet member (8) and the bracket (9) are temporarily fixed by being brought into close contact with (39). Further, by bending the straight engaging claw forming protrusion (23A) inward in the front-rear direction to form the engaging claw (23), the three plates (11A), (11B), and (12) are temporarily fixed. Temporarily fix the partition plate (15). Thus, the three plates (11A), (11B) and (9) are temporarily fixed, the partition plate (15) is temporarily fixed, and the bracket (9) is temporarily fixed. In the case of the second header tank (3), only the bracket (9) is temporarily fixed using the upper clamping wall (24) in the same manner as in the case of the first header tank (2).

  After that, the heat exchanger tube (4), corrugated fin (5), and side plate (6) are combined by an appropriate method and temporarily fixed by appropriate means, and these are collectively brazed to form a gas cooler (1 ) Is manufactured.

  The gas cooler (1) constitutes a supercritical refrigeration cycle together with an intermediate heat exchanger that exchanges heat between the refrigerant that has come out of the compressor and the evaporator, the decompressor and the gas cooler and the refrigerant that has come out of the evaporator. For example, it is installed in a car.

In the gas cooler (1) described above, the CO ₂ that has passed through the compressor passes through the refrigerant inflow passage (18) of the inlet member (7) from the refrigerant inlet (17) to the inlet header portion (1) of the first header tank (2). 13A) enters the refrigerant flow path (13a), diverts while flowing downward in the refrigerant flow path (13a), and flows into the refrigerant passage (4a) of the heat exchange pipe (4) of the upper heat exchange pipe group. . The CO _{2 that} has flowed into the refrigerant passage (4a) flows to the left in the refrigerant passage (4a), and the upper half of the refrigerant passage (42a) in the intermediate header portion (42) of the second header tank (3). Flows into the section. The CO _{2 that} has flowed into the upper half of the refrigerant flow path (42a) in the intermediate header section (42) flows downward in the refrigerant flow path (42a) and is divided to be a heat exchange pipe of the lower heat exchange pipe group. The refrigerant flows into the refrigerant passage (4a) of (4), flows rightward in the refrigerant passage (4a), and enters the refrigerant passage (13b) in the outlet header portion (13B) of the first header tank (2). . Thereafter, CO ₂ flows downward in the refrigerant flow path (13b) of the outlet header section (13B) and flows out through the refrigerant outlet (19) and the refrigerant outlet path (21) of the outlet member (8). Then, while CO ₂ flows through the refrigerant passage (4a) of the heat exchange pipe (4), the ventilation gap is heat-exchanged with the air flowing in the direction indicated by the arrow X in FIG.

  In the above embodiment, the header tanks (2) and (3) are formed by three plates (11A), (11B) and (12), but the pipe connection plate (12) and the second plate (11B) In addition, one or more plates may be interposed between the two. The plate has the same configuration as the second plate (11B).

In the above embodiment, CO ₂ is used as the supercritical refrigerant in the supercritical refrigeration cycle. However, the present invention is not limited to this, and ethylene, ethane, nitric oxide, and the like can be used.

  Further, in the above embodiment, the heat exchange pipe (4) is made of an extruded aluminum material, but from a bent body obtained by bending a metal plate for tube production made of an aluminum brazing sheet having a brazing filler metal layer on both sides thereof. It may be.

  Furthermore, in the above embodiment, the heat exchanger of the present invention is applied to a gas cooler of a supercritical refrigeration cycle. However, the present invention is not limited to this, and other heat exchangers such as a supercritical refrigeration cycle are used. It is also possible to apply to an evaporator.

It is a perspective view which shows the whole structure of the gas cooler to which the heat exchanger of this invention is applied. FIG. 2 is a partially omitted vertical sectional view of the gas cooler of FIG. It is an AA line expanded sectional view of FIG. FIG. 3 is an enlarged sectional view taken along line B-B in FIG. 2. It is a fragmentary perspective view which shows the outline of 1 process of the method of manufacturing a gas cooler, and shows the process of temporarily fixing three plates, an inlet member, an outlet member, and a bracket of a 1st header tank. It is a fragmentary perspective view which shows the outline of 1 process of the method of manufacturing a gas cooler, and shows the process of temporarily fixing three plates, an inlet member, an outlet member, and a bracket of a 2nd header tank.

Explanation of symbols

(1): Gas cooler (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(7): Entrance member (accessory)
(8): Outlet member (accessory)
(9): Bracket (accessory)
(11): Tank body
(11A): 1st plate
(11B): Second plate
(12): Pipe connection plate
(22): Protruding wall
(24): Clamping wall (clamping part)
(33) (34) (39): Inclined surface
(35): Inclined part

Claims (4)

A pair of header tanks spaced apart from each other, a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks, and joined to the header tank Each header tank is composed of a tank body and a pipe connection plate that covers the surface of the tank body facing the heat exchange pipe side and is joined to the tank body. In the heat exchanger in which the protruding walls along the both sides of the tank body in the ventilation direction are formed on both side edges in the ventilation direction of
Both projecting walls of the pipe connection plate are provided with a clamping part whose tip protrudes to the outside of the tank body, and the accessory parts are joined to the header tank while being clamped by the clamping parts of both projecting walls. Heat exchanger. The length in the length direction of the header tank at the clamping part of both protruding walls of the pipe connection plate is longer than the length of the accessory part in the same direction, and it is attached by a part of the length direction of both clamping parts. The heat exchanger according to claim 1, wherein the parts are sandwiched. Inclined surfaces that are slanted inward in the ventilation direction toward the length of the heat exchange pipe are provided on both sides in the ventilation direction of the accessory part, and are attached to the sandwiched portions of both protruding walls of the pipe connection plate The heat exchanger according to claim 1 or 2, wherein an inclined portion that is in close contact with an inclined surface of the component is provided. The tank main body comprises a first plate located outside, and a second plate that is interposed between the first plate and the pipe connection plate and brazed to both plates. The heat exchanger in any one.

Images