JP2008249241A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of positioning end portions of a heat exchange tube and preventing a brazing filler metal from flowing into a passage of the heat exchange tube in brazing. <P>SOLUTION: A header tank 2 is constituted by stacking three kinds of plates 13, 14 and brazing them. An outward bulging portion is formed on the outer plate, a tube insertion hole is formed on the inner plate 13, and a communication hole for communicating the tube insertion hole with the outward bulging portion is formed on the intermediate plate 14. A gap 35 for preventing contact of the heat exchange tube 8 and the communication hole 31 of the intermediate plate 14, and preventing capillary phenomenon is formed over the whole periphery between the outer peripheral face of the heat exchange tube 8 and the inner peripheral face of the communication hole 31 of the intermediate plate 14. Positioning portions 32 projecting inward and kept into contact with end faces of both side walls 8b extending in the tube width direction of the heat exchange tube 8, are formed on the side face extending in the longitudinal direction of the communication hole 31 of the intermediate plate 14 in a state of not closing a passage 8a of the heat exchange tube 8. The end faces of both side walls 8b of the heat exchange tube 8 are kept into contact with the positioning portions 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

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

  As a heat exchanger used in the supercritical refrigeration cycle, a pair of header tanks arranged at a distance from each other, and between the header tanks, the width direction is directed in the ventilation direction and the distance in the length direction of the header tank is set. And a plurality of flat heat exchange pipes whose both ends are respectively connected to both header tanks. Each header tank has an outer plate, an inner plate, and an intervening plate between the two plates. At least one outward bulging portion that extends in the length direction of the header tank and is closed by the intermediate plate is formed on the outer plate. A plurality of tube insertion holes that are long in the width direction of the heat exchange tube are spaced apart in the length direction of the inner plate at a portion corresponding to the outward bulging portion of the inner plate. A through hole is formed in the intermediate plate that is long in the width direction of the heat exchange tube and allows the tube insertion holes of the inner plate to pass into the outward bulging portion of the outer plate. Both ends of the heat exchanger tube are inserted into the tube insertion holes of the inner plates of both header tanks and brazed to the inner plate, and both ends of the heat exchange tube are intermediate in the thickness direction of the intermediate plate in the communication holes of the intermediate plates of both header tanks. There is known a heat exchanger that is positioned in a section (see Patent Document 1).

  In such a heat exchanger, the length in the length direction of the heat exchange pipe in the heat exchange core portion including the heat exchange pipe and fins arranged in the ventilation gap between adjacent heat exchange pipes is made constant. It is required to do. Therefore, in the heat exchanger described in Patent Document 1, the positions of both end portions in the tube width direction of the heat exchange pipe that protrude inwardly in the hole length direction on the inner peripheral surface of the communication hole of the intermediate plate are provided. A stepped portion to be regulated is formed, and both end portions in the tube width direction of the heat exchange tube are in contact with both end portions in the hole length direction of the inner peripheral surface of the communication hole, and end surfaces at both ends in the tube width direction are in contact with the step portion. In the state, the heat exchange tube is brazed to the inner plate.

By the way, as described in paragraph 0069 of Patent Document 1, the inner plate of the heat exchanger described in Patent Document 1 is composed of a brazing sheet having brazing material layers on both the front and back surfaces. Capillary phenomena occur due to contact between the ends of the exchange tube in the tube width direction and both ends of the inner circumferential surface of the communication hole in the hole length direction and the contact between the end surface of both ends in the tube width direction and the stepped portion. As a result, the brazing material melted from the inner plate is brought into contact with both ends in the tube width direction of the heat exchange tube and both ends in the hole length direction of the inner peripheral surface of the communication hole by capillary action, and both ends in the tube width direction. There is a risk that the clogging of the passage may occur due to the flow into the passage of the heat exchange pipe through the contact portion between the end face and the step portion.
JP 2003-314987 A (paragraph 0067 to paragraph 0072, FIGS. 12 to 14)

  An object of the present invention is to provide a heat exchanger that can solve the above-mentioned problems, can position the end of the heat exchange tube, and can prevent the brazing material from flowing into the passage of the heat exchange tube during brazing. It is to provide.

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

1) A pair of header tanks arranged at a distance from each other and between the header tanks, the width direction is directed in the ventilation direction and the header tanks are arranged at intervals in the length direction, and both end portions are respectively A plurality of flat heat exchange pipes connected to both header tanks, each header tank having an outer plate, an inner plate, and an intermediate plate interposed between the two plates stacked on each other. At least one outward bulging portion formed by brazing and extending in the length direction of the header tank and closed by the intermediate plate is formed on the outer plate, and the outer bulging portion in the inner plate is formed. A plurality of tube insertion holes that are long in the width direction of the heat exchange tube are formed in a penetrating manner at intervals in the length direction of the inner plate, and the intermediate plate The hole is formed in the shape of a through hole, and the both ends of the heat exchange pipe are inside the pipe insertion holes of the inner plates of both header tanks. In the heat exchanger that is inserted and brazed to the inner plate, and both ends of the heat exchange pipes are located in the middle part in the thickness direction of the intermediate plate in the communication holes of the intermediate plates of both header tanks,
Between the outer peripheral surface of the heat exchange tube and the inner peripheral surface of the communication hole of the intermediate plate, a clearance is provided over the entire circumference to prevent contact between the two and the hole in the communication hole of the intermediate plate. A positioning part that protrudes inward from the hole on the side surface that extends in the length direction and that is in contact with the end faces of both side walls that extend in the tube width direction of the heat exchange tube is formed so as not to block the passage of the heat exchange tube. A heat exchanger in which the end surfaces of both side walls are in contact with the positioning portion.

  2) The heat exchanger according to 1) above, wherein a plurality of positioning portions are formed, and the surfaces facing the heat exchange tubes in all positioning portions are located on the same plane.

  3) The heat exchanger according to 1) or 2), wherein the positioning portions are formed on both side surfaces extending in the hole length direction of the communication hole of the intermediate plate.

  4) The heat exchanger according to 3) above, wherein a plurality of positioning portions are formed on both side surfaces of the communication hole of the intermediate plate at intervals in the length direction.

  5) The heat exchanger according to 4) above, wherein the positioning portions formed on both side surfaces of the communication hole are at the same position in the length direction of the communication hole.

  According to the heat exchanger of 1) above, there is a gap between the outer peripheral surface of the heat exchange tube and the inner peripheral surface of the communication hole of the intermediate plate that prevents contact between the two and prevents the capillary phenomenon from occurring. Therefore, the molten brazing material is prevented from flowing into the passage of the heat exchange tube due to capillary action during brazing. Therefore, occurrence of passage clogging is prevented. Moreover, a positioning part that protrudes inward from the side surface extending in the hole length direction of the communication hole of the intermediate plate and the end faces of both side walls extending in the tube width direction of the heat exchange pipe contacts the passage of the heat exchange pipe. Since the end surfaces of both side walls of the heat exchange tube are in contact with the positioning portion, the depth of insertion of the end portion of the heat exchange tube into the combination of the three types of plates when manufacturing the heat exchanger The thickness can be made constant. Therefore, the depth of insertion of all heat exchange tubes into both header tanks in the heat exchanger is equal, and the heat is provided with fins arranged in the ventilation gap between the heat exchange tubes and adjacent heat exchange tubes. The length in the length direction of the heat exchange pipe in the exchange core part can be made constant. Moreover, since the insertion depth of the end portion of the heat exchange pipe into the combined body of the three types of plates can be made constant, the state of refrigerant diversion to all the heat exchange pipes is stabilized and the heat exchange performance is improved. .

  According to the heat exchangers of the above 2) to 4), when the heat exchanger is manufactured, the insertion depth of the end portion of the heat exchange pipe into the combined body of the three kinds of plates can be effectively made constant. it can. Therefore, the insertion depths of all the heat exchange pipes into both header tanks in the heat exchanger are equalized, the dimensional accuracy of the heat exchange core part is further improved, and the state of the refrigerant diversion to all the heat exchange pipes is improved. The heat exchange performance is further improved stably.

  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 left and right in FIGS. 1 and 2 are referred to as top and bottom and left and right, respectively. In addition, the downstream side (direction indicated by arrow X in FIG. 1) of the air flowing through the ventilation gap between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear.

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

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 heat exchange core section (4) provided between the header tanks (2) and (3).

  The right header tank (2) is provided with an inlet header portion (5) and an outlet header portion (6) arranged vertically. The left header tank (3) is provided with an intermediate header portion (7) from the upper end to the lower end so as to straddle the inlet header portion (5) and the outlet header portion (6) of the right header tank (2).

  The heat exchange core part (4) includes a plurality of flat extruded heat exchange pipes (8) made of aluminum extruded sections that are arranged in parallel with an interval in the vertical direction and a width direction in the front-rear direction (ventilation direction). A corrugated fin (9) disposed outside the heat exchange pipe (8) at the upper and lower ends and brazed to the heat exchange pipe (8), and a ventilation gap between adjacent heat exchange pipes (8), An aluminum side plate (11) disposed on the outside of the corrugated fins (9) at both upper and lower ends and brazed to the corrugated fins (9). The heat exchange tube (8) is made of a bare material formed of an aluminum extruded profile, and has a plurality of refrigerant passages (8a) arranged in the width direction. The corrugated fin (9) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and is composed of a wave top portion, a wave bottom portion and a horizontal connection portion connecting the wave top portion and the wave bottom portion, A plurality of louvers are formed in the connecting portion side by side in the front-rear direction.

  As shown in FIGS. 2 to 7, the right header tank (2) has a brazing sheet having a brazing material layer on both sides, here an outer plate (12) formed of an aluminum brazing sheet, and a brazing material layer on both sides. An inner plate (13) formed from an aluminum brazing sheet, here an aluminum brazing sheet, and a metal bear material, here an aluminum bear material, interposed between the outer plate (12) and the inner plate (13) Further, the single intermediate plate (14) is laminated and brazed to each other.

  A plurality of dome-shaped outward bulges (15, 16) extending in the vertical direction on the outer plate (12) and having the same bulge height, length and width are spaced apart in the vertical direction. Formed. The peripheral edge of the opening facing the left side of each outward bulge (15) (16) in the outer plate (12) is brazed to the intermediate plate (14), and each outward bulge (15) (16) The opening facing the left side is closed by an intermediate plate (14). As a result, the outer bulging portions (15) and (16) are closed at both upper and lower ends, and become first refrigerant circulation portions (15a) and (16a) in which the refrigerant flows in the vertical direction.

  A refrigerant inlet (17) is formed at the top of the upper outer bulge (15) of the outer plate (12), and a refrigerant inflow passage leading to the refrigerant inlet (17) on the outer surface of the outer bulge (15) An inlet member (18) made of a metal having (19), here made of aluminum bare material, is brazed using a brazing material on the outer surface of the outer plate (12). Further, a refrigerant outlet (21) is formed at the top of the lower outer bulging portion (16), and a refrigerant outflow passage (23) communicating with the refrigerant outlet (21) is formed on the outer surface of the outer bulging portion (16). An outlet member (22) made of a metal having an outer surface of the outer plate (12) is brazed using a brazing material made of a metal having an outer surface of the outer plate (12). The outer plate (12) is formed by pressing an aluminum brazing sheet having a brazing material layer on both sides.

  The inlet member (18) and the outlet member (22) are respectively formed with screw holes (24), (25) extending forward from the rear surface. In the supercritical refrigeration cycle, the screw hole (24) of the inlet member (18) 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 (22). (25) is used for screwing the joint member attached to the tip of the pipe extending from the intermediate heat exchanger.

  A plurality of through-tube insertion holes (26) that are long in the front-rear direction are formed in the inner plate (13) at intervals in the vertical direction. The size of the tube insertion hole (26) is such that capillary action occurs between the inner peripheral surface of the tube insertion hole (26) and the outer peripheral surface of the heat exchange tube (8), and the gas cooler (1) When brazing at the time of manufacturing, the brazing material melted from the brazing material layer of the inner plate (13) is caused by capillarity to the inner peripheral surface of the tube insertion hole (26) and the outer peripheral surface of the heat exchange tube (8). It flows in between. A plurality of tube insertion holes (26) in the upper half are formed in the vertical range of the upper outward bulge portion (15) of the outer plate (12), and a plurality of tube insertion holes (also in the lower half) ( 26) is formed within the vertical range of the lower outward bulge portion (16). The length in the front-rear direction of the tube insertion hole (26) is slightly longer than the width in the front-rear direction of each outward bulge (15) (16), and both front and rear ends of the tube insertion hole (26) are outwardly expanded. It protrudes outward from the front and rear side edges of the protruding portions (15) and (16). In addition, the front and rear edges of the inner plate (13) protrude rightward and the tip reaches the outer surface of the outer plate (12), and the boundary between the outer plate (12) and the intermediate plate (14) is fully extended. A covering wall (27) is formed integrally and is brazed to both the front and rear side surfaces of the outer plate (12) and the intermediate plate (14). A plurality of engaging portions (28) that engage with the outer surface of the outer plate (12) are integrally formed at the protruding end of each covering wall (27) at intervals in the vertical direction. It is brazed. As shown in FIG. 3, the engaging portion (28) is not bent before the three plates (12), (13), and (14) are stacked, and is straight on the covering wall (27). It is lined up. The straight engaging part before bending is shown by (28A).

  The inner plate (13) is bent outward in the left-right direction on both sides of the tube insertion hole (26) in the tube width direction (vertical direction) of the inner plate (13). A projecting portion (29) that is slightly inclined toward the intermediate plate (14) side (outside in the left-right direction) and protrudes outward in the left-right direction, that is, toward the intermediate plate (12) is integrally formed. The inner surfaces in the vertical direction of both protrusions (29) are flush with both side surfaces extending in the length direction of the tube insertion hole (26). Further, the outer surface in the vertical direction of the protrusion (29) is an inclined surface that is inclined toward the tube insertion hole (26) toward the outer side in the left-right direction. The inner plate (13) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  The intermediate plate (14) has a through-hole communication hole (31) that allows the tube insertion hole (26) of the inner plate (13) to pass into the outward bulges (15) and (16) of the outer plate (12). The same number as the tube insertion hole (26) is formed. Each communication hole (31) is formed at a position corresponding to each tube insertion hole (26) of the inner plate (13). Each communication hole (31) of the intermediate plate (14) is slightly larger than the cross-sectional shape of the tube insertion hole (26) of the inner plate (13) and the heat exchange tube (8). The end faces of both side walls (8b) projecting inward and extending in the pipe width direction of the heat exchange pipe (8) are contacted to both side faces extending in the hole length direction of each communication hole (31) of the intermediate plate (14). A plurality of, in this case, two positioning portions (32) in contact with each other are formed at intervals in the hole length direction so as not to block the refrigerant passage (8a) of the heat exchange pipe (8). The positioning portions (32) on the both side surfaces of the communication hole (31) are at the same position in the front-rear direction (hole length direction). The surfaces facing the inner side in the left-right direction (heat exchange pipe (8) side) in all positioning portions (32) are located on the same plane. Further, the surface of all the positioning portions (32) facing outward in the left-right direction (outer plate (12) side) is flush with the outer surface in the left-right direction of the intermediate plate (14).

  In each communication hole (31) of the intermediate plate (14), the protrusions (29) on both upper and lower edges of the tube insertion hole (26) of the inner plate (13) are in the thickness direction of the communication hole (31). It is designed to enter up to the middle part. The plurality of tube insertion holes (26) in the upper half of the inner plate (13) are connected to the upper side of the outer plate (12) via the plurality of communication holes (31) in the upper half of the intermediate plate (14). The plurality of tube insertion holes (26) in the lower half portion are communicated with the first refrigerant circulation portion (15a) in the outward bulge portion (15), and the plurality of tube insertion holes (26) in the lower half portion are also in the plurality of lower half portions in the intermediate plate (14). The first refrigerant circulation part (16) in the lower outward bulging part (16a) of the outer plate (12) is communicated through the communication hole (31). All the communication holes (31) communicating with the upper first refrigerant circulation part (15a) of the outer plate (12) and all the communication holes (31) communicating with the lower first refrigerant circulation part (16a) The communication part (33) is formed by cutting out the central part in the front-rear direction of the part between the adjacent communication holes (31) in (14). As a result, the communication portion (33) for communicating the communication holes (31) facing the first refrigerant circulation portions (15a) and (16a) of the outer plate (12), and the central portion in the front-rear direction (communication) of the communication holes (31) The portion of the hole (31) corresponding to the communication portion (33)) leads to the intermediate plate (14) to the first refrigerant flow portions (15a) (16a) of the outer plate (12) and the refrigerant is vertically A flowing second refrigerant circulation part (14a) (14b) is formed. The intermediate plate (14) is formed by pressing an aluminum bare material.

  Then, the inlet header portion (5) and the outlet portion are formed by portions corresponding to the outwardly bulging portions (15) and (16) in the three plates (12), (13) and (14) constituting the right header tank (2). A header portion (6) is formed, both first refrigerant circulation portions (15a) (16a) of the outer plate (12), and both second refrigerant circulation portions (14a) (14b) of the intermediate plate (14), Thus, an internal refrigerant circulation space for the inlet header portion (5) and the outlet header portion (6) is formed.

  The left header tank (3) has substantially the same configuration as the right header tank (2), and the same components and the same parts are denoted by the same reference numerals (see FIG. 2). Both header tanks (2) and (3) are arranged so that the inner plates (13) face each other.

  As shown in FIGS. 1, 2 and 8, the outer plate (12) of the left header tank (3) is 1 more than the number of outward bulges (15) and (16) of the right header tank (2). The lower end of the outer plate (12) so that a small number, here one dome-shaped bulge (34), straddles both bulges (15) (16) of the right header tank (2) It is formed from the part to the lower end part. The peripheral edge of the opening facing the right side of the outward bulge (34) in the outer plate (12) is brazed to the intermediate plate (14), and the opening facing the right side of the outward bulge (34) is intermediate. It is blocked by a plate (14). As a result, both the upper and lower ends are closed in the outward bulging portion (34), and the first refrigerant circulation portion (34a) flows in the vertical direction. A refrigerant inlet and a refrigerant outlet are not formed in the outward bulge portion (34).

  All pipe insertion holes (26) in the inner plate (13) of the left header tank (3) are formed within the vertical direction of the outward bulge (34) of the outer plate (12) All the tube insertion holes (26) of the plate (13) are connected to the first bulges (34) of the outer plate (12) through the communication holes (31) of the intermediate plate (14). It is made to communicate with the refrigerant circulation part (34a). All the communication holes (31) of the intermediate plate (14) are communicated with each other by a communication part (33) formed by cutting a central part in the front-rear direction between adjacent communication holes (31) in the intermediate plate (14). It has been. As a result, the intermediate plate (14) is connected to the outer plate (12) by the communication portion (33) and the central portion in the front-rear direction of the communication hole (31) (the portion corresponding to the communication portion (33) in the communication hole (31)). ) Refrigerant circulation section (34a) and a second refrigerant circulation section (14c) is formed in which the refrigerant flows in the vertical direction.

  The two header portions (2) of the right header tank (2) are formed by the portions corresponding to the outward bulge portions (34) in the three plates (12) (13) (14) constituting the left header tank (3). 5) One number less than (6), here one intermediate header part (7) is provided so as to straddle both header parts (5) and (6) of the right header tank (2). The refrigerant circulation part (34a) of the plate (12) and the second refrigerant circulation part (14c) of the intermediate plate (14) form an internal refrigerant circulation space of the intermediate header part (7).

  Other configurations of the left header tank (3) are the same as those of the right header tank (2).

  Both ends of the heat exchange pipe (8) are inserted into the pipe insertion hole (26) of the inner plate (13) of both header tanks (2) (3) and the communication hole (31) of the intermediate plate (14), respectively. The inner plate (13) is brazed using the brazing material layer of the inner plate (13). Here, contact between the outer peripheral surface of the portion existing in the communication hole (31) of the intermediate plate (14) in the heat exchange pipe (8) and the inner peripheral surface of the communication hole (31) is prevented. Thus, a gap (35) that prevents the occurrence of capillary action is provided over the entire circumference (see FIG. 6). The width (W) of the gap (35) is preferably 0.5 mm or more over the entire circumference in order to surely prevent the occurrence of capillary action. The upper limit of the width (W) of the gap (35) is appropriately determined in consideration of the overall size of the gas cooler (1), the number of heat exchange tubes (8), and the like. Also, the end faces of both side walls (8b) extending in the pipe width direction of the heat exchange pipe (8) abut against the positioning part (32) of the intermediate plate (14), so that both ends of the heat exchange pipe (8) The intermediate plates (14) of the tanks (2) and (3) are positioned in the intermediate portion in the plate thickness direction. As a result, both ends of the heat exchange pipe (8) are the second refrigerant flow portions ( 14a) located in (14b).

  The right end of the heat exchange pipes (8) in the upper half of the heat exchange core (4) is connected to the right header tank (2) so as to communicate with the upper outer bulge (15), and the left end is It is connected to the left header tank (3) so as to communicate with the outward bulge portion (34). Also, the right end of the plurality of heat exchange tubes (8) in the lower half is connected to the right header tank (2) so as to communicate with the lower outer bulge (16), and the left end is the outer bulge. (34) is connected to the left header tank (3) so as to communicate with the inside.

  The gas cooler (1) is manufactured by combining and brazing all parts together.

  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 above-described gas cooler (1), the CO ₂ that has passed through the compressor passes through the refrigerant inflow passage (19) of the inlet member (18) and swells from the refrigerant inlet (17) to the upper side of the right header tank (2). Into the first refrigerant circulation part (15a) of the part (15), and is divided through the upper second refrigerant circulation part (14a) and the communication hole (31) of the intermediate plate (14), and the upper outer bulge part ( 15) The refrigerant flows into the refrigerant passages (8a) of all the heat exchange pipes (8) communicating with the inside. The CO _{2 that} has flowed into the refrigerant passage (8a) flows to the left in the refrigerant passage (8a), and in the first refrigerant circulation portion (34a) of the outer bulging portion (34) of the left header tank (3). Flows into the top of the. The CO ₂ flowing into the upper part of the first refrigerant circulation part (34a) of the outward bulge part (34) flows downward through the inside and the second refrigerant circulation part (14c) of the intermediate plate (14), It flows into the refrigerant passages (8a) of all the heat exchange pipes (8) that are diverted through the second refrigerant circulation part (14c) and the communication hole (31) and communicate with the lower outer bulge part (16). The flow direction is changed to flow right in the refrigerant passage (8a), and the lower second refrigerant circulation part (14b) and the communication hole (31) of the intermediate plate (14) of the right header tank (2) are connected. Then, it enters the first refrigerant circulation part (16a) of the lower outward bulge part (16). Thereafter, CO ₂ flows out through the refrigerant outlet (21) and the refrigerant outlet path (23) of the outlet member (22). Then, while CO ₂ flows through the refrigerant passage (8a) of the heat exchange pipe (8), heat exchange is performed between the ventilation gap and air flowing in the direction indicated by the arrow X in FIG.

In the above embodiment, the heat exchanger according to the present invention is applied to the gas cooler of the supercritical refrigeration cycle. However, the heat exchanger according to the present invention may be applied to the above-described evaporator of the supercritical refrigeration cycle. This evaporator has a supercritical refrigeration cycle that uses a supercritical refrigerant such as CO ₂ together with an intermediate heat exchanger that exchanges heat between the refrigerant that comes out of the compressor, gas cooler, decompressor, and gas cooler and the refrigerant that comes out of the evaporator. It is configured and mounted on a vehicle such as an automobile as a car air conditioner.

  In the above embodiment, the header tanks (2) and (3) are formed by laminating three types of plates, the outer plate (12), the inner plate (13) and the intermediate plate (14) one by one. However, the present invention is not limited to this, and two or more intermediate plates (14) may be laminated. In this case, the positioning part (32) is formed on any one of the intermediate plates (14).

Further, in the above embodiment, as the supercritical refrigerant of a supercritical refrigeration cycle, but CO ₂ is used, it is not limited thereto, ethylene, ethane, etc. nitric oxide can be used.

  Furthermore, in the above embodiment, the heat exchange tube (8) is made of an extruded aluminum material that is a bare material, but is not limited to this, and a tube made of an aluminum brazing sheet having brazing material layers on both sides. You may consist of a bending body which bent the metal plate for manufacture.

It is a perspective view which shows the whole structure of the gas cooler to which the heat exchanger by this invention is applied. FIG. 2 is a partially omitted vertical sectional view of the gas cooler of FIG. It is a perspective view which shows the part of the right header tank 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. FIG. 3 is an enlarged sectional view taken along the line CC in FIG. 2. It is the DD sectional view taken on the line of FIG. It is a disassembled perspective view which shows the left header tank of the gas cooler of FIG.

Explanation of symbols

(1): Gas cooler (heat exchanger)
(2) (3): Header tank
(8): Heat exchange pipe
(8a): Passage
(8b): Side wall
(12): Outer plate
(13): Inside plate
(14): Intermediate plate
(15) (16) (34): Outward bulge
(26): Tube insertion hole
(31): Communication hole
(32): Positioning part
(35): Clearance

Claims (5)

A pair of header tanks arranged at a distance from each other and between the header tanks, the width direction is directed in the ventilation direction, and the header tanks are arranged at intervals in the length direction. A plurality of flat heat exchange tubes connected to the tank, and each header tank is brazed by laminating an outer plate, an inner plate, and an intermediate plate interposed between the two plates. The outer plate has at least one outward bulging portion extending in the length direction of the header tank and closed by the intermediate plate, and corresponds to the outward bulging portion of the inner plate. A plurality of tube insertion holes, which are long in the width direction of the heat exchange tube, are formed in a penetrating manner at intervals in the length direction of the inner plate, and the width of the heat exchange tube is The through holes are formed in the outer plate so that each tube insertion hole of the inner plate is connected to the outer bulging portion of the outer plate, and both end portions of the heat exchange tubes are in the tube insertion holes of the inner plates of both header tanks. In the heat exchanger that is inserted and brazed to the inner plate, and both ends of the heat exchange pipes are located in the middle part in the thickness direction of the intermediate plate in the communication holes of the intermediate plates of both header tanks,
Between the outer peripheral surface of the heat exchange tube and the inner peripheral surface of the communication hole of the intermediate plate, a clearance is provided over the entire circumference to prevent contact between the two and the hole in the communication hole of the intermediate plate. A positioning part that protrudes inward from the hole on the side surface that extends in the length direction and that is in contact with the end faces of both side walls that extend in the tube width direction of the heat exchange tube is formed so as not to block the passage of the heat exchange tube. A heat exchanger in which the end surfaces of both side walls are in contact with the positioning portion. The heat exchanger according to claim 1, wherein a plurality of positioning portions are formed, and the surfaces of all the positioning portions facing the heat exchange tube are located on the same plane. The heat exchanger according to claim 1 or 2, wherein the positioning portions are formed on both side surfaces extending in the hole length direction of the communication hole of the intermediate plate. The heat exchanger according to claim 3, wherein a plurality of positioning portions are formed on both side surfaces of the communication hole of the intermediate plate at intervals in the length direction. The heat exchanger according to claim 4, wherein the positioning portions formed on the both side surfaces of the communication hole are at the same position in the length direction of the communication hole.

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