JP2009287907A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of confirming existence of a partitioning plate when components are assembled and temporarily fixed in manufacturing, and preventing displacement in the longitudinal direction of a header tank, of the partitioning plate. <P>SOLUTION: The header tank 2 of this heat exchanger is composed of a tank main body 7 having a hollow section opened at its both ends, and a plate 8 for pipe connection. The partitioning plate 11 is disposed on a prescribed position of the tank main body 7. A partitioning plate insertion hole 27 for inserting the partitioning plate 11 from an outer side, is formed on the tank main body 7, and the partitioning plate 11 is inserted into the partitioning plate insertion hole 27 in a state that its outer edge section is exposed to an outer part of the tank main body 7. A projecting section 39 is formed on an edge section directing to a side of the plate 8 for pipe connection, of the partitioning plate 11. A through-hole 37 to which the projecting section 39 of the partitioning plate 11 is fitted, is formed on the plate 8 for pipe connection, and the projecting section 39 of the partitioning plate 11 is brazed to the plate 8 for pipe connection in such a state that it is press-fitted into the through-hole 37. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

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

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

  For example, 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 As a pair of header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks, Each header tank is composed of a tank body and a pipe connection plate that covers a surface of the tank body facing the heat exchange pipe side and is joined to the tank body, and the inside of each header tank is a refrigerant flow path. At least one header portion is provided, and the tank body is formed of one cylindrical body having both ends opened, and a hollow portion having both ends opened is provided. In addition, at least one header part is formed in each header tank by disposing a partition plate that closes the hollow part at least at both ends of the hollow part, and corresponds to the refrigerant flow path of the header part in the pipe connection plate A plurality of tube insertion holes are formed in a penetrating manner at intervals in the length direction of the tube connection plate, and an end of the heat exchange tube is inserted into the tube insertion hole to form a tube connection plate. A connecting hole that is brazed and has a hole for connecting the pipe insertion hole of the pipe connection plate in the refrigerant flow path of the header section formed in the tank body, and a partition plate is inserted into the tank body from the inside (heat exchange pipe side) A plate insertion hole is formed, and the partition plate is inserted from the inside into the partition plate insertion hole so that the inner edge of the partition plate is exposed to the inside of the tank body, and the outer edge contacts the inner peripheral surface of the tank body. In contact with the tank body Those are brazed to the plate for beauty pipe connection is known (see Patent Document 1).

By the way, manufacture of the heat exchanger of patent document 1 is performed by assembling each component and temporarily fixing, and then brazing each component collectively, but after assembling and temporarily fixing each component, the tank is manufactured. Since the presence or absence of the partition plate in the main body cannot be confirmed, there is a problem that a defective product is generated as a heat exchanger when forgetting to arrange the partition plate when assembling each part. Further, when brazing, the portion of the partition plate that contacts the inner peripheral surface of the hollow portion of the tank body may be displaced in the length direction of the header tank, resulting in brazing failure and refrigerant leakage. There is.
JP 2002-543368 gazette

  The object of the present invention is to solve the above problems and to confirm the presence or absence of a partition plate when assembling and temporarily fixing each part during manufacturing, and to prevent the partition plate from being displaced in the length direction of the header tank. It is to provide a heat exchanger that can be prevented.

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

1) A pair of header tanks spaced apart from each other and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks, Each header tank is composed of a tank body and a pipe connection plate that covers a surface of the tank body facing the heat exchange pipe side and is joined to the tank body, and the inside of each header tank is a refrigerant flow path. In addition, at least one header portion is provided, the tank body has a hollow portion extending in the length direction of the header tank and open at both ends, and a partition plate for closing the hollow portion is disposed at at least both ends of the tank body. As a result, at least one header portion is formed in each header tank, and a plurality of tube insertion holes are connected to the portion corresponding to the refrigerant flow path of the header portion in the tube connection plate. The plate is formed in a penetrating shape with an interval in the length direction of the plate, and the end of the heat exchange tube is inserted into the tube insertion hole and brazed to the tube connection plate, and the tube of the tube connection plate is attached to the tank body. In the heat exchanger in which the communication hole that allows the insertion hole to communicate with the refrigerant flow path of the header portion is formed,
A partition plate insertion hole for inserting the partition plate from the outside is formed in the tank body, and the partition plate is inserted from the outside into the partition plate insertion hole so that the outer edge of the partition plate is exposed to the outside of the tank body. Are formed on the edge of the partition plate facing the tube connection plate side, and a projection projecting toward the heat exchange tube is formed, and a through hole is formed in the tube connection plate to fit the projection of the partition plate. A heat exchanger in which the convex portion of the plate is joined to the pipe connection plate in a state of being press-fitted into the through hole of the pipe connection plate.

  2) 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 connection plate and brazed to both plates. An outwardly bent portion having a substantially U-shaped cross section that opens to the second plate side is formed at the center portion in the front-rear direction of the plate, and the pipe insertion hole of the pipe connection plate is provided in the header portion of the second plate of the tank body. A communication hole communicating with the refrigerant flow path is formed in a penetrating manner, and a partition plate insertion hole is formed so as to straddle the first plate and the second plate, and the outer edge of the partition plate and the outer surface of the first plate The heat exchanger as described in 1) above, wherein

  3) a first flow path forming portion in which the refrigerant flow path of the header portion of the header tank is formed of an inner space of the outward bent portion of the first plate and extends in the length direction of the header tank and is recessed outward; The second plate is formed on the surface of the two plates facing the first plate side and extends in the length direction of the header tank and is recessed inward. The end of the heat exchange pipe is the header of the header tank. The heat exchanger according to 2) above, which is located in the refrigerant flow path of the part.

  4) The above-mentioned 3), in which the cross-sectional shapes of the inner peripheral surfaces of the first flow path forming portion of the first plate and the second flow path forming portion of the second plate are each arcuate and consist of one arc portion. The described heat exchanger.

  5) The above 1) to 4), wherein at least one of the header tanks has a plurality of header portions, and the partition plate is disposed between both end portions of the header tank and adjacent header portions. ).

  According to the heat exchanger of 1) above, a partition plate insertion hole for inserting a partition plate from the outside is formed in the tank body, and the partition plate is partitioned so that its outer edge is exposed to the outside of the tank body. Since it is inserted into the plate insertion hole from the outside and joined to the header tank, it is possible to check the presence or absence of the partition plate in the tank body even after assembling and temporarily fixing each part when manufacturing the heat exchanger, As a result, it is possible to prevent a defective product from being generated as a heat exchanger. Further, a convex portion protruding to the heat exchange tube side is formed at an edge portion of the partition plate facing the pipe connection plate side, and a through hole into which the convex portion of the partition plate is fitted is formed in the pipe connection plate. Since the convex part is brazed to the pipe connection plate in a state where it is press-fitted into the through hole of the pipe connection plate, the position of the partition plate is shifted when the parts are assembled and temporarily fixed during manufacture of the heat exchanger. As a result, when all the parts are brazed together, it is possible to prevent the occurrence of brazing failure between the tank body and the pipe connecting plate and the partition plate.

  According to the heat exchanger of 2) above, the tank body can be made relatively easily. When manufacturing this heat exchanger, the pipe connection plate, the first plate, and the second plate are laminated so that the second plate comes to the intermediate portion, and temporarily fixed by an appropriate means. The partition plate can be temporarily fixed by inserting the partition plate into the partition plate insertion hole from the outside and press-fitting the convex portion into the through hole of the pipe connection plate.

  According to the heat exchanger of 3) above, the refrigerant flow path of the header portion of the header tank is composed of the internal space of the outward bent portion of the first plate, extends in the length direction of the header tank, and is recessed outward. Heat exchange, comprising a first flow path forming portion and a second flow path forming portion formed on the surface of the second plate facing the first plate and extending in the length direction of the header tank and recessed inward Since the end portion of the pipe is located in the refrigerant flow path of the header portion of the header tank, the end portion of the heat exchange pipe with respect to the first plate, the second plate, and the pipe connection plate is produced during the manufacture of the heat exchanger. Can be easily positioned. That is, in manufacturing the heat exchanger, the pipe connection plate, the first plate, and the second plate are laminated so that the second plate comes to the intermediate portion and temporarily fixed by appropriate means. Since the partition plate is not inserted into the partition plate insertion hole, both ends of the hollow portion of the tank body material formed by the first plate and the second plate are open. Therefore, with the rod-shaped tube receiving member inserted into the hollow portion from the opening at either end, the end of the heat exchange tube is inserted into the tube insertion hole of the tube connection plate and the communication hole of the second plate. By contacting the receiving member, the end of the heat exchange tube can be positioned, and the operation is simplified. Moreover, the end of the heat exchange pipe is inserted into the pipe insertion hole of the pipe connecting plate and the communication hole of the second plate and positioned by hitting the pipe receiving member, and then the pipe receiving member is pulled out, The partition plate can be temporarily fixed by inserting the partition plate into the partition plate insertion hole from the outside and press-fitting the convex portion into the through hole of the pipe connection plate.

  According to the heat exchanger of the above 4), the cross-sectional shapes of the inner peripheral surfaces of the first flow path forming portion of the first plate and the second flow path forming portion of the second plate are arcuate as a whole. Since it consists of one arc part, the stress concentration part which arises in the 1st and 2nd plate decreases, and the pressure to the heat exchange pipe side in the flow path of the header part of the header tank is for the 2nd plate and pipe connection Since it is received by the plate, the pressure resistance of the header tank is improved.

  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.

  In the following description, the top and bottom and the left and right in FIGS. 1 and 2 are referred to as the top and bottom and the left and right, respectively.

  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 to 8 show the configuration of the main part thereof. FIG. 9 shows some steps of the method of manufacturing the gas cooler.

1 and 2, a gas cooler (1) of a supercritical refrigeration cycle that uses a supercritical refrigerant, for example, CO ₂ , is arranged with two header tanks (2) (2) that are spaced apart in the left-right direction and extend in the up-down direction. 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) disposed outside the heat exchange tubes (4) at the upper and lower ends and brazed to the heat exchange tubes (4), and corrugated fins at the upper and lower ends. An aluminum side plate (6) disposed on the outside of (5) and brazed to the corrugated fin (5). 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 (7) 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 (7). And a pipe connection plate (8) brazed to the tank body (7).

  The tank body (7) is formed of 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 plate, here aluminum. Consists of a second plate (7B) made of bare material and interposed between the first plate (7A) and the pipe connection plate (8) and brazed to both plates (7A) (8) Has been. The tank body (7) has a hollow portion (9) extending in the vertical direction and open at both ends, and the hollow portion (9) is formed at the upper and lower end portions and the central portion in the vertical direction of the tank body (7). A partition plate (11) for closing is disposed. Then, the upper and lower end openings of the hollow portion (9) are closed by the partition plate (11), and the hollow portion (9) is formed by the partition plate (11) at the upper and lower portions (9A) (9B) at the center in the length direction. ), An inlet header portion (10A) whose inside is a refrigerant flow path (10a) and an outlet header portion (10B) whose inside is a refrigerant flow path (10b) are provided vertically. ing. The refrigerant flows in the length direction through the refrigerant flow path (10a) of the inlet header (10A) and the refrigerant flow path (10b) of the outlet header (10B).

  As shown in FIGS. 2 to 7, the left side (second plate (7B) is located in the center of the first header tank (2) in the front and rear direction (width direction) of the first plate (7A) of the tank body (7). An outward bent portion (7a) having a substantially U-shaped cross section that is open to the side) is formed over the entire length. The inner peripheral surface of the outward bent portion (7a) of the first plate (7A) has an arcuate cross section. The front and rear side portions of the outward bent portion (7a) of the first plate (7A) are respectively flat portions (7b) located in the same plane. The opening facing the left side of the outward bent portion (7a) of the first plate (7A) is closed by the second plate (7B). Through holes (25) extending in the front-rear direction and extending from one flat portion (7b) to the other flat portion (7b) are formed at both the upper and lower end portions and the vertical center portion of the first plate (7A). Yes.

  A refrigerant inlet (12) is formed at a position slightly below the through hole (25) at the upper end of the top of the outward bent portion (7a) of the first plate (7A), and the first plate (7A) A rectangular parallelepiped inlet member (13) made of metal having a refrigerant inflow passage (14) communicating with the refrigerant inlet (12) on the outer surface, here an aluminum bare material, uses the brazing material on the outer surface of the first plate (7A). It is brazed. Further, a refrigerant outlet (15) is formed at a position slightly above the through hole (25) at the lower end at the top of the outward bent portion (7a), and the refrigerant outlet is formed on the outer surface of the first plate (7A). A rectangular parallelepiped outlet member (16) made of metal having a refrigerant outflow passage (17) leading to (15), here made of aluminum bare material, is brazed using the brazing material on the outer surface of the first plate (7A). Yes. The first plate (7A) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The inlet member (13) and the outlet member (16) are respectively formed with screw holes (35) and (36) extending forward from the rear surface. In the supercritical refrigeration cycle, the screw hole (35) of the inlet member (13) is used to screw the joint member attached to the tip of the pipe extending from the compressor, and the screw hole of the outlet member (16). (36) is used for screwing the joint member attached to the tip of the pipe extending from the intermediate heat exchanger.

  In the pipe connecting plate (8) of the first header tank (2), a plurality of through pipe insertion holes (18) that are long in the front-rear direction are formed at intervals in the vertical direction. The plurality of tube insertion holes (18) in the upper half are formed in the vertical range of the refrigerant flow path (10a) of the inlet header portion (10A), and are also the plurality of tube insertion holes (18) in the lower half. Is formed within a range in the vertical direction of the refrigerant flow path (10b) of the outlet header portion (10B). The length in the front-rear direction of the tube insertion hole (18) is slightly longer than the width in the front-rear direction of the outward bent portion (7a), and both front and rear ends of the tube insertion hole (18) are formed in the outer bent portion (7a). Projects outward from both front and rear edges. In addition, a convex portion (39), which will be described later, of the partition plate (11) is press-fitted into the central portion in the front-rear direction at a position corresponding to the through hole (25) of the first plate (7A) in the pipe connection plate (8). A through hole (37) is formed. Furthermore, the pipe connecting plate (8) protrudes to the right and left side edges, and the tip reaches the outer surface of the first plate (7A), and the first plate (7A) and the second plate (7B). Side surface covering walls (19) covering both the front and rear side surfaces are integrally formed and brazed to the front and rear side surfaces of the first plate (7A) and the second plate (7B). A position shifted vertically from the through hole (25) at the projecting end of each side covering wall (19), here between the through hole (25) at both upper and lower ends and the through hole (25) at the center in the vertical direction Engaging claws (21) projecting inward in the front-rear direction and engaging with the outer surface of the first plate (7A) are integrally formed at the height positions of the first plate (7A) and brazed to the first plate (7A). . In addition, as shown by a solid line in FIG. 7, the engaging claw (21) is connected to the side covering wall (19) in a straight state before the three plates (7A), (7B), (8) are combined. Extends outward in the direction. A straight engaging claw is indicated by (21A). Then, after the three plates (7A), (7B), and (8) are combined, the three plates (7A), (7B), and (8) are temporarily fixed by bending the engaging claws (21A) inward in the front-rear direction. . The pipe connection plate (8) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The second plate (7B) of the first header tank (2) is long in the front-rear direction and has a pipe insertion hole (18) in the pipe connection plate (8) with an inlet header portion (10A) and an outlet header portion (10B). A plurality of communication holes (22) communicating with the refrigerant flow paths (10a) and (10b) are formed in a penetrating manner. Each communication hole (22) is one size larger than the tube insertion hole (18). A concave groove (23) having an arc-shaped cross section that is recessed inward in the left-right direction and opened outward in the left-right direction is formed over the entire length at the center in the front-rear direction on the outer surface in the left-right direction of the second plate (7B). In addition, the second plate (7B) extends in the vertical direction (the length direction of the second plate (7B)) on both the front and rear sides of the groove (23) on the surface facing the first plate (7A) and left and right. A wax flow preventing convex portion (38) protruding outward in the direction is integrally formed. The cross-sectional shape of the inner surface in the front-rear direction of the convex portion for preventing brazing flow (38) is an arc shape having the same curvature as the cross-sectional shape of the inner peripheral surface of the concave groove (23), and the inner periphery of the concave groove (23) Smoothly connected to the surface. Further, the wax flow preventing convex portion (38) is fitted in the outward bent portion (7a) of the first plate (7A). Further, the upper and lower ends of the second plate (7B) and the central portion in the vertical direction are respectively long in the front-rear direction so as to correspond to the through-holes (25) of the first plate (7A) and the through-holes (25). A through hole (26) having the same width and length is formed. Through the through hole (25) of the first plate (7A) and the through hole (26) of the second plate (7B), a penetrating partition plate insertion hole (27) is formed in both plates (7 ) And (9). By inserting the partition plate (11) into each partition plate insertion hole (27), the partition plates (11 at the upper and lower end portions and the vertical center portion of the first plate (7A) and the second plate (7B)). ) Is arranged. The concave groove (23) and the convex portion (38) are divided by the communication hole (22) and the through hole (26), and the concave groove (23) and the convex portion (38) are connected to the communication hole (22) and the through hole (26). It is provided in a portion where the through hole (26) is not formed.

  The partition plate (11) is formed of an aluminum brazing sheet having a brazing filler metal layer on both sides, and the outer edge of the partition plate insertion hole (27) is flush with the outer surface of the first plate (7A). A convex part (39) projecting inward (to the heat exchange pipe (4) side) is formed on the inner edge part (the edge part facing the pipe connection plate (8) side). ing. The partition plate (11) is inserted from the outside into each partition plate insertion hole (27) so that the outer edge is exposed to the outside of the tank body (7), and the convex portion (39) is for pipe connection. The plate (8) is press-fitted into the through hole, and in this state, the front and rear side edges of the partition plate (11) excluding the convex part (39) are in the first plate (7A) and the second plate (7B). The left and right inner edges are also brazed to the pipe connecting plate (8), and the upper and lower surfaces of the part excluding the convex part (39) of the partition plate (11) are the first plate (7A) and the first plate. The two plates (7B) are brazed, and the convex portion (39) is brazed to the pipe connecting plate (8). Then, by inserting the partition plate (11) into each partition plate insertion hole (27), the partition plate is formed at both the upper and lower ends of the first plate (7A) and the second plate (7B) and at the center in the vertical direction. (11) is arranged, thereby opening both upper and lower ends of the inner space (24) of the outward bent portion (7a) of the first plate (7A) and both upper and lower ends of the concave groove (23) of the second plate (7B). The opening is closed by the partition plate (11), and the inner space (24) of the outward bent portion (7a) and the concave groove (23) of the second plate (7B) are separated by a partition plate ( It is divided into top and bottom by 11). In the portion between the upper and lower partition plates (11) and the central partition plate (11), a plurality of tube insertion holes (18) in the upper half of the pipe connection plate (8) and a plurality of lower half The tube insertion hole (18) is formed.

  The inlet header portion (10A) of the first header tank (2) is more than the partition plate (11) at the center in the vertical direction of the first plate (7A), the pipe connection plate (8) and the second plate (7B). It is formed by the upper part, and the outlet header (10B) is also more than the partition plate (11) at the center in the vertical direction of the first plate (7A), the pipe connection plate (8) and the second plate (7B). It is formed by the lower part. The refrigerant flow paths (10a) and (10b) of the inlet header portion (10A) and outlet header portion (10B) of the first header tank (2) are divided into a partition plate (11) at both upper and lower ends and a partition plate ( 11) and the first plate (7A) are formed on the inner surface in the left-right direction (the surface facing the second plate (7B)) and extend in the length direction of the first header tank (2). The first flow path forming portions (28), (29) recessed outward, and the first flow path forming portions (28 on the left and right outer surfaces (the surfaces facing the first plate (7A)) of the second plate (7B). ) (29) and second flow path forming portions (31), (32) respectively formed in portions corresponding to the length of the first header tank (2) and recessed inward. The first flow path forming portions (28), (29) of the first plate (7A) are formed by dividing the upper and lower partition plates (11) in the inner space (24) of the outward bent portion (7a) and the vertical center portion. The second flow path forming portions (31), (32) of the second plate (7B) are formed between the upper and lower partition plates (11) of the concave groove (23). It consists of the part which exists between the partition plates (11) of the center part of an up-down direction. The cross-sectional shapes of the inner peripheral surfaces of the first flow path forming portions (28), (29) of the first plate (7A) and the second flow path forming portions (31), (32) of the second plate (7B) are entirely Each is arcuate and has one arcuate portion.

  As shown in FIGS. 2 and 8, 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 connection plates (8) face each other.

  The first plate (7A) and the second plate (7B) of the second header tank (3) have partition plates (11) arranged only at the upper and lower ends, and the hollow portion (9) of the tank body (7). Only the upper and lower end openings are closed by the partition plate (11). Therefore, the hollow portion (9) of the tank body (7), the inner space (24) of the outward bent portion (7a) of the first plate (7A) and the concave groove (23) of the second plate (7B) are vertically It is not partitioned, and the second header tank (3) has an internal refrigerant flow path (20a) so as to straddle the inlet header portion (10A) and the outlet header portion (10B) of the first header tank (2). One intermediate header portion (20) is formed. Note that the refrigerant inlet and the refrigerant outlet are not formed in the outward bent portion (7a) of the first plate (7A).

  All the pipe insertion holes (18) of the pipe connection plate (8) of the second header tank (3) are the vertical range of the refrigerant flow path (20a) of the intermediate header part (20), that is, the partitions at the upper and lower ends. It is formed between the plates (11), and all the pipe insertion holes (18) of the pipe connection plate (8) pass through all the communication holes (22) of the second plate (7B). The refrigerant channel (20a) in (20) is communicated.

  The intermediate header portion (20) of the second header tank (3) is formed by a portion between the upper and lower partition plates (11) in the first plate (7A), the pipe connection plate (8) and the second plate (7B). Has been. The refrigerant flow path (20a) of the intermediate header portion (20) of the second header tank (3) is provided between the upper and lower partition plates (11) and the inner surface (second plate) of the first plate (7A) in the left-right direction. The first flow path forming portion (33) formed on the (7B) side) and extending in the length direction of the first header tank (2) and recessed outward, and the second plate (7B) It is formed in the portion corresponding to the first flow path forming portion (33) on the outer surface in the left-right direction (the surface facing the first plate (7A)) and extends in the length direction of the second header tank (3) and inward. It consists of a recessed second flow path forming part (34). The first flow path forming portion (33) of the first plate (7A) is composed of a portion existing between the upper and lower partition plates (11) in the inner space (24) of the outward bent portion (7a). The 2nd flow path formation part (34) of 2 plates (7B) consists of a part which exists between the partition plates (11) of the upper and lower ends in a ditch | groove (23). The cross-sectional shape of the inner peripheral surface of the first flow path forming portion (33) of the first plate (7A) and the second flow path forming portion (34) of the second plate (7B) is the first header tank (2). This is the same as the case of the first flow path forming portions (28), (29) of the first plate (7A) and the second flow path forming portions (31), (32) of the second plate (7B). Has a part.

  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 (18) of the header tanks (2) and (3), respectively, using the brazing material layer of the pipe connection plate (8). It is brazed to the pipe connection plate (8). Note that both ends of the heat exchange pipe (4) enter the communication hole (22) up to the middle part in the thickness direction of the second plate (7B), and the inlet header part (10A), outlet header part (10B) and It is located in the refrigerant flow path (10a) (10b) (20a) of the intermediate header part (20). All the heat exchange pipes (4) have a right end portion that leads to the refrigerant flow path (10a) of the inlet header portion (10A) of the first header tank (2) and a left end portion that is an intermediate header of the second header tank (3). A heat exchange pipe group consisting of a plurality of heat exchange pipes (4) communicating with the upper half of the refrigerant flow path (20a) of the section (20), and an outlet header section (10B) of the first header tank (2) at the right end. A plurality of heat exchange pipes (4) communicating with the refrigerant flow path (10b) of the second header tank (3) and communicating with the lower half of the refrigerant flow path (20a) of the intermediate header section (20) of the second header tank (3). By dividing into heat exchange pipe groups, it is divided into first and second two paths (P1) (P2), and all the heat exchange pipes that constitute each path (P1) (P2) (4 ) Are the same in the refrigerant flow direction, and the refrigerant flow directions in the heat exchange pipes (4) of the two paths (P1) and (P2) are different.

  The gas cooler (1) is manufactured by combining all the parts, temporarily fastening them with appropriate means, and brazing them together. When the gas cooler (1) is manufactured, the three plates (7A) (7B) (7B) are bent by bending the straight engaging claws (21A) inward in the front-rear direction after combining the three plates (7A) (7B) (8). ) (8) is temporarily fixed, and then both ends of the heat exchange pipe (4) are inserted into the pipe insertion hole (18) of the pipe connection plate (8) and the communication hole (22) of the second plate (7B). At the same time, the partition plate (11) is inserted into the partition plate insertion hole (27). That is, as shown in FIG. 9, the temporary fixing bodies of the three plates (7A), (7B) and (8) are arranged at intervals, and the heat exchange pipe (4) and the corrugated fin (5) (in FIG. 9). Corrugated fins (5 are not shown) are arranged alternately, and a rod-shaped tube receiving member (40) is attached to the first and second plates (7A) and (7B) of the temporary fixing body from the opening at either end. Is inserted into the hollow portion (9). Next, until both ends of the heat exchange pipe (4) hit the pipe receiving member (40) in the pipe insertion hole (18) of the pipe connection plate (8) and the communication hole (22) of the second plate (7B) insert. As a result, the both end portions of the heat exchange pipe (4) can be positioned, and the operation is simplified. Next, after pulling out the tube receiving member (40) from the hollow portion (9) of the first and second plates (7A) and (7B) of the temporary fixing body, the partition plate (11) is inserted into the partition plate insertion hole (27). The convex portion (39) is press-fitted into the through hole (37) of the pipe connecting plate (8). When the convex portion (39) is press-fitted into the through hole (37), the size of the convex portion (39) is slightly smaller than the size of the through hole (37), and the convex portion (39) is inserted into the through hole. (37) This is done by caulking the convex portion (39) and then deforming it. The size of the convex portion (39) is slightly larger than the size of the through hole (37), and the convex portion (39) is forcibly inserted into the through hole (37). Also good.

  The gas cooler (1) constitutes a supercritical refrigeration cycle together with a compressor, an evaporator, a decompressor, and an intermediate heat exchanger that exchanges heat between the refrigerant coming out of the gas cooler and the refrigerant coming 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 (14) of the inlet member (13) from the refrigerant inlet (12) to the inlet header portion (1) of the first header tank (2). 10A) enters the refrigerant flow path (10a), flows downward in the refrigerant flow path (10a), and is divided into the refrigerant paths (4a) of all the heat exchange pipes (4) in the first path (P1). Flow into. 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 (20a) in the intermediate header portion (20) of the second header tank (3). Flows into the section. The CO ₂ flowing into the upper half of the refrigerant flow path (20a) in the intermediate header section (20) flows downward in the refrigerant flow path (20a) and is divided to all the heat in the second path (P2). The refrigerant flows into the refrigerant passage (4a) of the exchange pipe (4), changes the flow direction, flows to the right in the refrigerant passage (4a), and flows into the outlet header portion (10B) of the first header tank (2). Enter the channel (10b). Thereafter, CO ₂ flows downward in the refrigerant flow path (10b) of the outlet header section (10B), and flows out through the refrigerant outlet (15) and the refrigerant outlet path (17) of the outlet member (16). Then, while CO ₂ flows in 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 (7A), (7B) and (8), but the pipe connection plate (8) and the second plate (7B) In addition, one or more plates may be interposed between the two. The plate has the same configuration as the second plate (7B) except that the second flow path forming portions (31) and (32) are not provided.

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. FIG. 3 is a partially enlarged view of FIG. 2. 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. FIG. 3 is an enlarged sectional view taken along the line CC in FIG. 2. It is a disassembled perspective view of the 1st header tank of the gas cooler of FIG. It is a disassembled perspective view of the 2nd header tank of the gas cooler of FIG. It is a perspective view which shows the outline of the one part process of the method of manufacturing a gas cooler.

Explanation of symbols

(1): Gas cooler (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(7): Tank body
(7A): 1st plate
(7B): Second plate
(7a): outward bend
(8): Pipe connection plate
(9): Hollow part
(10A): Entrance header
(10a): Refrigerant flow path
(10B): Exit header
(10b): Refrigerant flow path
(11): Partition plate
(18): Tube insertion hole
(20): Intermediate header
(20a): Refrigerant flow path
(22): Communication hole
(24): Interior space
(27): Partition plate insertion hole
(28) (29) (33): 1st flow path formation part
(31) (32) (34): Second flow path forming part
(37): Through hole
(39): Convex

Claims (5)

Each header includes a pair of header tanks arranged at a distance from each other, and a plurality of heat exchange pipes arranged in parallel between both header tanks and having both ends connected to both header tanks. The tank is composed of a tank main body and a pipe connecting plate that covers the surface of the tank main body facing the heat exchange pipe side and is joined to the tank main body. One header portion is provided, the tank body has a hollow portion extending in the length direction of the header tank and open at both ends, and a partition plate for closing the hollow portion is disposed at at least both ends of the tank body. Accordingly, at least one header part is formed in each header tank, and a plurality of pipe insertion holes are provided for pipe connection in portions corresponding to the refrigerant flow paths of the header part in the pipe connection plate. It is formed in a penetrating shape with an interval in the length direction of the rate, and the end of the heat exchange pipe is inserted into the pipe insertion hole and brazed to the pipe connection plate, and the pipe of the pipe connection plate is attached to the tank body. In the heat exchanger in which the communication hole that allows the insertion hole to communicate with the refrigerant flow path of the header portion is formed,
A partition plate insertion hole for inserting the partition plate from the outside is formed in the tank body, and the partition plate is inserted from the outside into the partition plate insertion hole so that the outer edge of the partition plate is exposed to the outside of the tank body. Are formed on the edge of the partition plate facing the tube connection plate side, and a projection projecting toward the heat exchange tube is formed, and a through hole is formed in the tube connection plate to fit the projection of the partition plate. A heat exchanger in which the convex portion of the plate is joined to the pipe connection plate in a state of being press-fitted into the through hole of the pipe connection plate. The tank body is composed of a first plate located outside, a second plate interposed between the first plate and the pipe connection plate and brazed to both plates. An outwardly bent portion having a substantially U-shaped cross section that opens to the second plate side is formed in the center portion in the front-rear direction, and the pipe insertion hole of the pipe connection plate is formed in the second plate of the tank main body as a refrigerant in the header portion. A communication hole communicating with the flow path is formed in a penetrating shape, and a partition plate insertion hole is formed so as to straddle the first plate and the second plate. The outer edge of the partition plate and the outer surface of the first plate The heat exchanger according to claim 1, which is flush. A refrigerant flow path in the header portion of the header tank is formed of an internal space of an outward bent portion of the first plate, extends in the length direction of the header tank and is recessed outward, and a second plate And a second flow path forming portion which is formed on the surface facing the first plate side and extends in the length direction of the header tank and is recessed inward, and an end portion of the heat exchange pipe is connected to the header portion of the header tank. The heat exchanger according to claim 2, which is located in the refrigerant flow path. The cross-sectional shape of the internal peripheral surface of the 1st flow path formation part of a 1st plate and the 2nd flow path formation part of a 2nd plate is respectively circular arc shape, and consists of one circular arc part. Heat exchanger. At least one of the header tanks has a plurality of header portions, and the partition plate is disposed between both end portions of the header tank and adjacent header portions. The heat exchanger in any one of.

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