JP2009115378A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, preventing brazing filler metal from flowing into a passage of a heat exchange pipe in manufacture. <P>SOLUTION: A pipe insert hole is formed in an inner plate 37 constituting a header tank of the heat exchanger. Both end parts of the heat exchange pipe 33 are inserted in the pipe insert hole of the inner plate 37 and brazed to the inner plate 37. Two communicating hole columns 61A, 61B formed of a plurality of communication holes 44 are provided at spaces in the longitudinal direction in an intermediate plate 38. In some sets of communicating holes 44 out of all sets of two communicating holes 44 adjacent to each other in the longitudinal direction, the front and rear communicating holes 44 are separated from each other. The surface pointing the inner plate 37 in the intermediate plate 38 includes a brazing material inflow groove 62, which communicates the longitudinal outer end part of the communicating hole 44 to both front and rear side surfaces of the intermediate plate 38, and a brazing material inflow groove 63, which communicates the longitudinal inner end parts of the front and rear communicating holes 44 separated from each other. <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 particularly, is suitably used for an evaporator or a gas cooler of a supercritical refrigeration cycle in which a supercritical refrigerant such as CO ₂ (carbon dioxide) is used. Related to the heat exchanger.

  In this specification and claims, the downstream side (the direction indicated by the arrow X in FIG. 1 and the direction indicated by the arrow Y in FIG. 11) of the air flowing through the ventilation gap between the adjacent heat exchange tubes is moved forward. The opposite side is the back.

  Further, 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.

  Further, in this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  As a heat exchanger used in a 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 front-rear direction and the distance in the length direction of the header tank. 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 front-rear direction are formed in the inner plate at a portion corresponding to the outward bulging portion and spaced in the length direction of the inner plate. The intermediate plate is formed with a through hole that is long in the front-rear direction and connects each tube insertion hole of the inner plate into the outward bulging portion of the outer plate. Is inserted into the tube insertion hole of the inner plate and brazed to the inner plate, and both ends of the heat exchange tube are positioned in the intermediate portion in the thickness direction of the intermediate plate in the communication hole of the intermediate plate of both header tanks. A heat exchanger is known (see Patent Document 1).

By the way, the heat exchanger described in Patent Document 1 is manufactured by temporarily brazing all the components together and then brazing all the components together in such a posture that the width direction of the heat exchange tube is vertical. Is done. Therefore, as shown in FIG. 14, when the inner plate (100) and the intermediate plate (101) are brazed, the molten brazing material (B) flows downward and the communication hole (102 of the intermediate plate (101) When the amount of the accumulated brazing filler metal (B) increases and flows into the passage (103a) of the heat exchange pipe (103), the passage may be clogged.
JP-A-2005-300135

  An object of the present invention is to provide a heat exchanger that solves the above-described problems and can prevent the brazing material from flowing into the passage of the heat exchange pipe during manufacture.

  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 two header tanks, the width direction is directed in the front-rear direction and the header tank is 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. Each header tank is formed by brazing, and at least one header portion having a hollow portion through which a refrigerant flows is formed. A plurality of long portions in the front-rear direction are formed in portions corresponding to the hollow portions of the header portion in the inner plate. A tube insertion hole is formed in a penetrating manner at intervals in the length direction of the inner plate, and the intermediate plate is long in the front-rear direction and constitutes a part of the hollow portion, and the inner plate The communication holes that allow the pipe insertion holes of the plate to pass through the hollow part of the header part are formed in a through shape, and both ends of the heat exchange pipes are inserted into the pipe insertion holes of the inner plates of both header tanks and brazed to the inner plate. In addition, in the heat exchanger in which both ends of the heat exchange pipe are located in the intermediate portion in the thickness direction of the intermediate plate in the communication hole of the intermediate plate of both header tanks,
A heat exchanger in which a brazing material inflow groove extending in the front-rear direction and extending to at least one end of the communication hole is formed in a portion corresponding to each communication hole on a surface facing the inner plate side of the intermediate plate.

  2) The middle plate is provided with a plurality of rows of communicating holes made of a plurality of communicating holes arranged in the length direction of the header tank at intervals in the front-rear direction, and the communicating holes adjacent to the front and rear are the length of the header tank. The front and rear communication holes are spaced apart from each other in at least some of the pairs of two communication holes that are formed at the same position in the direction and are adjacent to the front and rear. And a brazing material inflow groove through which the front end in the front-rear direction of the communication hole and the front and rear side surfaces of the intermediate plate are connected to the front-rear side and the front-rear side faces of the intermediate plate are adjacent to each other in the front-rear direction. The heat exchanger as described in 1) above, wherein a brazing material inflow groove is formed through the inner ends of the hole in the front-rear direction.

  3) An intermediate plate is provided with a row of communication holes made up of a plurality of communication holes arranged in the length direction of the header tank, on the surface facing the inner plate side of the intermediate plate, at both front and rear ends of each communication hole. The heat exchanger according to the above 1), wherein a brazing material inflow groove extending in the front-rear direction is formed.

  According to the heat exchanger of 1) above, a brazing material inflow groove extending in the front-rear direction and extending to at least one end of the communication hole is formed in a portion corresponding to each communication hole in the surface facing the inner plate side of the intermediate plate. Therefore, when manufacturing the heat exchanger, after all parts are assembled and temporarily fixed, brazing is performed in such a posture that the width direction of the heat exchange pipe is vertical and the brazing material inflow groove is on the lower side. As a result, the molten brazing material flows downward and flows into the brazing material inflow groove between the inner plate and the intermediate plate. Therefore, it is possible to prevent a large amount of molten brazing material from being accumulated in the lower end portion in the communication hole of the intermediate plate. As a result, the molten brazing material does not flow into the passage of the heat exchange pipe, and it is possible to prevent passage clogging.

  According to the heat exchanger of the above 2), in manufacturing the heat exchanger, after temporarily fixing all the parts in combination, if the brazing is performed in a posture in which the width direction of the heat exchange pipe is oriented in the vertical direction, the inner plate Between the first and second intermediate plates, the molten brazing material passes through the end of the communication hole located on the lower side and the side surface located on the lower side of the intermediate plate, and the front and rear separated from each other. It flows into the brazing material inflow groove that passes through the inner ends of the adjacent communication holes in the front-rear direction. Therefore, it is possible to prevent a large amount of molten brazing material from being accumulated in the lower end portion in the communication hole of the intermediate plate. As a result, the molten brazing material does not flow into the passage of the heat exchange pipe, and it is possible to prevent passage clogging. Moreover, even if the edge of either side of the intermediate plate comes to the lower side, the molten brazing material flows downward and flows into the brazing material inflow groove, so that it is easy to arrange the temporary fixing product during brazing. It can be carried out.

  According to the heat exchanger of 3) above, when the heat exchanger is manufactured, after all components are temporarily joined together and then brazed in a posture in which the width direction of the heat exchange tube faces the vertical direction, the inner plate Between the intermediate plate and the intermediate plate, the molten brazing material flows into a brazing material inflow groove that passes through the lower end of the communication hole and the side surface located below the intermediate plate. Therefore, it is possible to prevent a large amount of molten brazing material from being accumulated in the lower end portion in the communication hole of the intermediate plate. As a result, the molten brazing material does not flow into the passage of the heat exchange pipe, and it is possible to prevent passage clogging. Moreover, even if the edge of either side of the intermediate plate comes to the lower side, the molten brazing material flows downward and flows into the brazing material inflow groove, so that it is easy to arrange the temporary fixing product during brazing. It can be carried out.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the following description, the upper and lower sides and the left and right sides of FIGS.

  In addition, the same code | symbol is attached | subjected to the same part and the same thing through all drawings, and the overlapping description is abbreviate | omitted.

Embodiment 1
This embodiment is shown in FIGS. 1 to 10, and the heat exchanger according to the present invention is applied to an evaporator of a supercritical refrigeration cycle.

  1 and 2 show the overall structure of an evaporator to which a heat exchanger according to the present invention is applied, and FIGS. 3 to 10 show the structure of the main part of the evaporator.

1 and 2, an evaporator (30) of a supercritical refrigeration cycle that uses a supercritical refrigerant, for example, CO ₂ , is arranged with two header tanks (31) (31) (see FIG. 2) spaced apart in the vertical direction and extending in the horizontal direction. 32) and a plurality of flat heat exchange pipes (33) extending in the vertical direction between the header tanks (31) and (32), with the width direction oriented in the front-rear direction and spaced in the left-right direction, and Corrugated fins (34) disposed outside the heat exchange pipes (33) at the left and right ends and brazed to the heat exchange pipes (33) An aluminum bear side plate (35) disposed on the outside of the corrugated fins (34) at both ends and brazed to the corrugated fins (34).

  As shown in FIGS. 2 to 7, the upper header tank (31) includes a brazing sheet having a brazing material layer on both sides, here an outer plate (36) formed of an aluminum brazing sheet, and a brazing material layer on both sides. A brazing sheet, here an inner plate (37) formed from an aluminum brazing sheet and a metal bear material, here an aluminum bear material, and interposed between the outer plate (36) and the inner plate (37) And an intermediate plate (38) brazed to both plates (36) and (37). In the upper header tank (31), a pair consisting of two header parts (1), (2) and (3) (4) which are formed in a line in the front-rear direction and spaced apart from each other is provided in the left-right direction. Two rows are provided at intervals.

  Two dome-shaped outward bulges (39A) (39B) and (39C) (39D) extending in the left-right direction on the right and left sides of the outer plate (36) of the upper header tank (31) It is formed at intervals in the direction. Hereinafter, in this embodiment, the outer bulging portion (39A) of the front right portion is the first outer bulging portion, the outer bulging portion (39B) of the rear right portion is the second outer bulging portion, The outward bulging portion (39C) in the front left portion is referred to as a third outward bulging portion, and the outward bulging portion (39D) in the rear left portion is referred to as a fourth outward bulging portion. The openings facing the lower side of the inner spaces (39a) (39b) (39c) (39d) of the first to fourth outwardly bulging portions (39A) to (39D) in the outer plate (36) are intermediate plates (38 ). The outer plate (36) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  A plurality of through-tube insertion holes (41) that are long in the front-rear direction are formed in the front-rear side portions of the inner plate (37) of the upper header tank (31) at intervals in the left-right direction. The plurality of tube insertion holes (41) on the right side of the front row are formed within the horizontal range of the first outer bulge portion (39A) of the outer plate (36), and the plurality of tube insertion holes (41) on the right side of the back row Is formed in the left-right range of the second outward bulge portion (39B), and the plurality of tube insertion holes (41) on the left side of the front row are in the horizontal range of the third outward bulge portion (39C). The plurality of tube insertion holes (41) on the left side of the rear row are formed in the left-right direction range of the fourth outward bulge portion (39D). Further, the front and rear side edges of the inner plate (37) protrude upward, the tip reaches the outer surface of the outer plate (36), and the boundary between the outer plate (36) and the intermediate plate (38) extends over the entire length. A covering wall (42) for covering is integrally formed and brazed to both the front and rear side surfaces of the outer plate (36) and the intermediate plate (38). A plurality of engaging portions (43) that engage with the outer surface of the outer plate (36) are integrally formed at the protruding end of each covering wall (42) at intervals in the left-right direction, and are formed on the outer plate (36). It is brazed. The inner plate (37) is formed by pressing an aluminum brazing sheet having a brazing material layer on both sides.

  In the middle plate (38) of the upper header tank (31), the tube insertion hole (41) of the inner plate (37) that is long in the front-rear direction is provided with the outward bulges (39A) to (39D) of the outer plate (36). The same number of through-holes (44) communicating with the internal spaces (39a) to (39d) of the tube insertion hole (41) are formed, and the upper header tank (31) is formed in the intermediate plate (37). A plurality of, in this case, two communication hole arrays (61A) and (61B) each having a plurality of communication holes (44) arranged in the longitudinal direction are provided at intervals in the front-rear direction. The front and rear communication holes (44) are formed at the same position in the length direction of the upper header tank (31). The communication hole (44) is slightly larger than the tube insertion hole (41).

  The plurality of pipe insertion holes (41) on the right side of the front row of the inner plate (37) of the upper header tank (31) are connected to the plurality of right side communication holes (44) in the front side communication hole row (61A) of the intermediate plate (38). The plurality of tube insertion holes (41) on the right side of the rear row are also connected to the rear side communication hole row (61B) of the intermediate plate (38) through the inner space (39a) of the first outer bulge portion (39A). ) Through the inner space (39b) of the second outward bulge portion (39B) through the plurality of communication holes (44) on the right side, and the remaining tube insertion holes (41) on the left side of the front row are The plate (38) is connected to the internal space (39c) of the third outward bulge (39C) through the left communication hole (44) in the front communication hole array (61A) of the plate (38). The remaining pipe insertion hole (41) is an internal space of the fourth outer bulging portion (39D) through the remaining communication hole (44) on the left side in the rear communication hole row (61B) of the intermediate plate (38). (39d).

  All the communication holes (44) leading to the inner space (39a) of the first outer bulging portion (39A) of the outer plate (36) in the front communication hole row (61A) of the intermediate plate (38), and the rear communication All the communication holes (44) communicating with the internal space (39b) of the second outward bulge portion (39B) in the hole row (61B) are respectively connected to the left and right communication holes (44) in the intermediate plate (38). It is connected by the communication part (46) formed by excising the front-back direction center part in between. And the communication part (46) which makes all the communication holes (44) communicated with the internal space (39a) (39b) of the 1st and 2nd outward bulge part (39A) (39B) of an outer side plate (36) communicate , And the central part in the front-rear direction of the communication hole (44), the inner space (39a) of the first and second outer bulges (39A) (39B) of the outer plate (36) is placed on the intermediate plate (38). A refrigerant circulation part (40A) (40B) is formed which communicates with 39b) and allows the refrigerant to flow in the left-right direction. The communicating holes (44) communicated by the communicating part (46) of both the front and rear communicating hole rows (61A) and (61B) form a pair, and the front and rear communicating holes (44) Are separated from each other.

  Each communication hole (44) leading to the internal space (39c) of the third outer bulge portion (39C) of the outer plate (36) in the front communication hole row (61A) of the intermediate plate (38), and the rear communication hole Each communication hole (44) communicating with the internal space (39d) of the fourth outward bulge portion (39D) in the row (61B) is between the communication holes (44) adjacent in the front-rear direction in the intermediate plate (38). It is made to communicate by the refrigerant | coolant turn communication part (45) formed by excising a part, and, thereby, the internal space (2nd and 4th outward bulging part (39C) (39D) of an outer side plate (36) ( 39c) (39d) The two communicate with each other. The intermediate plate (38) is formed by pressing an aluminum bear material.

  Front and rear direction of each communication hole (44) of both front and rear communication hole rows (61A) (61B) in the part corresponding to all the communication holes (44) on the surface facing the inner plate (37) of the intermediate plate (38) A brazing material inflow groove (62) is formed which communicates with the outer end portion and extends outward in the front-rear direction to reach both front and rear side surfaces of the intermediate plate (37). Further, on the surface of the intermediate plate (38) facing the inner plate (37), the inner space (39a) of the first outward bulging portion (39A) of the outer plate (36) in the front communication hole row (61A) All communicating holes (44) and all communicating with the inner space (39b) of the second outer bulging portion (39B) in the rear communicating hole row (61B) separated from these communicating holes (44) A brazing material inflow groove (63) is formed through the through-hole (44) (through the front-rear inner ends of the communication holes (44) adjacent to each other in the front-rear direction).

  Two right protrusions (36a) (37a) (38a) are formed at the right ends of the three plates (36), (37), and (38) at intervals in the front-rear direction. The intermediate plate (38) is formed with a notch (47) leading from the tip of the two front and rear right protrusions (38a) to the communication hole (44) at the right end, thereby allowing the upper header tank (31) A refrigerant inlet (48) communicating with the inner space (39a) of the front refrigerant circulation portion (40A) of the intermediate plate (38) and the first outer bulge portion (39A) of the outer plate (36), A refrigerant outlet (49) communicating with the inner space (39b) of the rear refrigerant circulation part (40B) of the intermediate plate (38) and the second outer bulge part (39B) of the outer plate (36) is formed. The refrigerant inlet (52) and refrigerant outlet (52) leading to the refrigerant inlet (49) so as to straddle the two right protrusions (36a) (37a) (38a) of the three plates (36) (37) (38). 50) A refrigerant inlet / outlet member (51) having a refrigerant outlet channel (53) is brazed to the upper header tank (31) by a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet (57). Yes. The refrigerant inlet / outlet member (51) is made of a metal bare material, here an aluminum bear material.

  Then, the inlet header portion (1) is formed by the portions corresponding to the first and second outwardly bulging portions (39A) (39B) in the three plates (36) (37) (38) of the upper header tank (31). And an outlet header portion (2) is formed, which also corresponds to the third and fourth outwardly bulging portions (39C) (39D) in the three plates (36) (37) (38) of the upper header tank (31). Two intermediate header portions (3) and (4) are formed by the portion to be performed. By the internal spaces (39a) (39b) of the first and second outwardly bulging portions (39A) (39B) of the outer plate (36) and the refrigerant circulation portions (40A) (40B) of the intermediate plate (38), The inlet header portion (1) and the hollow portions (1A) and (2A) of the outlet header portion (2) are formed which open downward and are closed by the inner plate (37). Also, the inner space (39c) (39d) of the third and fourth outer bulges (39C) (39D) of the outer plate (36), the communication hole (44) of the intermediate plate (38) and the coolant turn A hollow portion (3A) (4A) of both intermediate header portions (3) (4) is formed by a part of the communication portion (45) and opened downward and closed by the inner plate (37). ing. The hollow portions (3A) and (4A) of the two intermediate header portions (3) and (4) are communicated with each other via the refrigerant turn communication portion (45).

  As shown in FIG. 2, FIG. 3, FIG. 8, and FIG. 9, the lower header tank (32) has substantially the same configuration as the upper header tank (31), and the same components and the same parts are denoted by the same reference numerals. Both header tanks (31) (32) are arranged so that the inner plates (37) face each other. The differences between the lower header tank (32) and the upper header tank (31) are as described below.

On the outer plate (36) of the lower header tank (32), two outward bulging portions (54A) (54B) extending in the left-right direction are formed at intervals in the front-rear direction. Both outer bulges (54A) and (54B) are respectively a first outer bulge (39A) and a third outer bulge (39C) of the outer plate (36) of the upper header tank (31), The outer plate (36) is formed from the right end to the left end so as to straddle the second outer bulge (39B) and the fourth outer bulge (39D). The internal space of the front and rear outward bulging portion (54A) (54B) (54a ) (54b) is adapted to flow the CO ₂ in the lateral direction, respectively, CO ₂ is the front outward bulging portion (54A ) Flows from right to left, and flows from left to right in the inner space (54b) of the rear outward bulge portion (54B). Note that the both outwardly bulged portions (54A) and (54B) are not communicated with each other.

  A plurality of penetrating tube insertion holes (41) that are long in the front-rear direction are formed in the front-rear side portions of the inner plate (37) at intervals in the left-right direction. All the tube insertion holes (41) on the front side are formed within the lateral direction of the front outer bulge portion (54A) of the outer plate (36), and all the tube insertion holes (41) on the rear side are It is formed within a range in the left-right direction of the rear outer bulge portion (54B).

  It is formed at a position corresponding to the tube insertion hole (41) of the inner plate (37) in the front and rear communication hole rows (61A) (61B) of the intermediate plate (38), and each tube insertion hole (41) is expanded outward. All communication holes (44) communicating with the internal spaces (54a) and (54b) of the projecting parts (54A) and (54B) are cut out in the intermediate plate (38) between the communication holes (44) adjacent in the left-right direction. The communication part (46) formed by doing so makes it communicate. Then, all the communication holes (44A) of the front and rear communication hole rows (61A) (61B) leading to the inner spaces (54a) (54b) of the front and rear outer bulges (54A) (54B) of the outer plate (36) (44) ) Communicate with the intermediate plate (38) by the communicating portion (46) communicating with the communicating portion (46) and the communicating hole (44) in both the front and rear outer bulging portions (54A) (54B). Refrigerant circulation portions (55A) and (55B) are formed which communicate with the internal spaces (54a) and (54b) and through which the refrigerant flows in the left-right direction. The front and rear adjacent holes in the communication hole (44) communicated by the communication part (46) of both the front and rear communication hole rows (61A) and (61B) form a pair, and the front and rear communication holes ( 44) are separated from each other.

  Front and rear direction of each communication hole (44) of both front and rear communication hole rows (61A) (61B) in the part corresponding to all the communication holes (44) on the surface facing the inner plate (37) of the intermediate plate (38) A brazing material inflow groove (62) is formed which communicates with the outer end portion and extends outward in the front-rear direction to reach both front and rear side surfaces of the intermediate plate (37). Also, on the surface facing the inner plate (37) of the intermediate plate (38), all the communication holes (44) of the front communication hole row (61A) and the rear side separated from these communication holes (44) There is a brazing material inflow groove (63) that passes through all the communication holes (44) of the communication hole row (61B) (passes through the front and rear inner ends of the communication holes (44) adjacent to each other in the front-rear direction). Is formed.

  Note that the refrigerant inlet (49) and the refrigerant outlet (50) are not formed in the lower header tank (32).

  The front and rear two intermediate headers (the front and rear outer bulges (54A) and 54B) of the three plates (36) (37) (38) constituting the lower header tank (31) 5) (6) is formed. Opened upward by the inner space (54a) (54b) of the front and rear outer bulges (54A) (54B) of the outer plate (36) and the refrigerant circulation part (55A) (55B) of the intermediate plate (38). At the same time, hollow portions (5A) (6A) of both intermediate header portions (5) (6) are formed in which the opening is closed by the inner plate (37).

  The heat exchange pipe (33) is made of a bare metal material, here an aluminum extruded shape, and has a flat shape that is wide in the front-rear direction, and a plurality of refrigerant passages (33a) that extend in the length direction are arranged in parallel in the heat exchange pipe (33). Is formed. Both ends of the heat exchange pipe (33) are inserted into the pipe insertion holes (41) of the header tanks (31) and (32), respectively, and the inner plate using the brazing material layer of the inner plate (37). (37) is brazed. Both ends of the heat exchange pipe (33) enter the communication hole (44) up to an intermediate part in the thickness direction of the intermediate plate (38).

  The total heat exchange pipe (33) is composed of a plurality of heat exchange pipes (33) arranged in parallel at intervals in the left-right direction, and the same number as the communication hole rows (61A) (61B), that is, two rows in front and rear The heat exchange tube rows (56A) and (56B) are divided. The upper and lower ends of the plurality of heat exchange tubes (33) located in the right half of the front heat exchange tube row (56A) are inside the hollow portion (1A) of the inlet header portion (1) of the upper header tank (31) and Connected to both header tanks (31) and (32) to communicate with the right side in the hollow portion (5A) of the front intermediate header portion (5) of the lower header tank (32). The upper and lower ends of the heat exchange pipe (33) are hollow in the hollow portion (3A) of the front intermediate header portion (3) of the upper header tank (31) and in the hollow portion of the front intermediate header portion (5) of the lower header tank (32). It is connected to both header tanks (31) and (32) so as to communicate with the left part in the section (5A). The upper and lower ends of the plurality of heat exchange tubes (33) located in the right half of the rear heat exchange tube row (56B) are the hollow portions (2A of the outlet header portion (2) of the upper header tank (31). ) It is connected to both header tanks (31) and (32) so that it leads to the right side in the hollow part (6A) of the rear middle header part (6) in the inner and lower header tanks (32), and also in the left half The upper and lower ends of the plurality of heat exchange pipes (33) positioned in the hollow portion (4A) of the rear intermediate header portion (4) of the upper header tank (31) and the rear intermediate header of the lower header tank (32) It is connected to both header tanks (31) and (32) so as to communicate with the left side portion in the hollow portion (6A) of the portion (6).

  The heat exchange pipe (33) was formed by rolling an aluminum brazing sheet having a brazing filler metal layer on both sides, instead of one made of an aluminum extruded profile, and continued through a connecting portion. Two flat wall forming portions, a side wall forming portion integrally formed on the side edge opposite to the connecting portion in each flat wall forming portion, and forming both flat walls at a predetermined interval in the width direction of the flat wall forming portion A plate having a plurality of partition wall forming portions integrally formed in a protruding shape from the respective portions is bent into a hairpin shape at the connecting portion and brazed to each other by combining the side wall forming portions and partitioned by the partition wall forming portion. You may use what formed the wall.

  The corrugated fin (34) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and a plurality of the corrugated fins (34) are connected in parallel in the front-rear direction to the connecting portion connecting the wave head and the wave bottom. A louver is formed. The corrugated fin (34) is shared by both the front and rear heat exchange tube rows (56A) and (56B), and the width in the front and rear direction is the front edge and the rear edge of the heat exchange tube (33) of the front heat exchange tube row (56A). The distances between the side heat exchange tube row (56B) and the rear side edge of the heat exchange tube (33) are substantially equal. In addition, instead of sharing one corrugated fin (34) with both the front and rear heat exchange tube rows (56A) (56B), the adjacent heat exchange tubes (33) of the two heat exchange tube rows (56A) (56B) are connected to each other. Corrugated fins may be arranged between the two.

  Both header tanks (31) and (32) are manufactured as follows.

  First, an outer plate (36) having an outward bulging portion (39A) (39B) (39C) (39D) (54A) (54B) by applying press work to an aluminum brazing sheet having a brazing filler metal layer on both sides Form. Further, by pressing the aluminum brazing sheet having the brazing filler metal layer on both sides, the engaging portion forming protrusion piece straightly connected to the tube insertion hole (41), the covering wall (42) and the covering wall (42). An inner plate (37) having (43A) is formed (see FIGS. 7 and 9). Further, the intermediate plate (38) having a communication hole (44), a communication part (45) (46), and a refrigerant circulation part (40A) (40B) (55A) (55B) by pressing aluminum bear material Form. The outer plate (36), the intermediate plate (38) and the inner plate (37) of the upper header tank (31) are respectively formed with right protrusions (36a) (37a) (38a), and further the intermediate plate (38 ) Is formed with a notch (47).

  Next, after the three plates (36), (37), and (38) are combined in a laminated form, the protruding piece (43A) is bent to form the engaging portion (43), and the engaging portion (43) is connected to the outer plate (43). Engage with 36) to make a temporary fixing body. Thereafter, the three plates (36) (37) (38) are brazed to each other using the brazing material layer of the outer plate (36) and the brazing material layer of the inner plate (37), and the covering wall (42) Are brazed to both the front and rear side surfaces of the intermediate plate (38) and the outer plate (36), and the engaging portion (43) is brazed to the outer plate (36). Thus, both header tanks (31) and (32) are manufactured.

  The evaporator (30) is prepared by preparing the above-mentioned two temporary fixing bodies when manufacturing the header tanks (31) and (32), a plurality of heat exchange pipes (33) and corrugated fins (34), Temporary fixing bodies are arranged at intervals so that the inner plates (37) face each other, a plurality of heat exchange tubes (33) and corrugated fins (34) are arranged alternately, heat exchange tubes ( 33) inserting both ends of each into the tube insertion holes (41) of the inner plates (37) of both temporary fixing bodies, arranging the side plates (35) outside the corrugated fins (34) at both ends, In addition, the refrigerant inlet / outlet member (51) is arranged through the brazing sheet (57) so as to straddle the three plates (36), (37), and (38) to form a combined body. Position the tube (33) so that its width direction is vertical, and attach the three plates (36), (37), and (38) of the temporary fixing body to each other. The header tanks (31) and (32) are formed by brazing, and at the same time, the heat exchange pipe (33) is attached to the header tank (31) and (32), the fin (34) is attached to the heat exchange pipe (33), and the side plate ( 35) is manufactured by brazing the fins (34) and the input / output member (51) by brazing the upper header tank (31).

  When the evaporator (30) is manufactured, all the parts are combined and temporarily fixed, and then brazed in a posture in which the width direction of the heat exchange pipe (33) faces the vertical direction, as shown in FIG. Between the (37) and the intermediate plate (38), the molten brazing material (B) flows downward and flows into the brazing material inflow groove (62) located on the lower side. Therefore, it is prevented from flowing into the passage (33a) of the heat exchange pipe (33) through the lower end portion in the communication hole (44) of the intermediate plate (38), and it is possible to prevent passage clogging. become. In addition, in the portion where the continuous holes (44) separated from each other between the inner plate (37) and the intermediate plate (38) are provided, the molten brazing material (B) is connected to the upper and lower communication holes ( 44) flows into the brazing material inflow groove (63). Therefore, it is prevented from flowing into the passage (33a) of the heat exchange pipe (33) through the lower end portion in the communication hole (44) of the intermediate plate (38), and it is possible to prevent passage clogging. become. Furthermore, when brazing in a posture such that the width direction of the heat exchange pipe (33) faces the vertical direction, the inner plate (37) And the intermediate plate (38), the molten brazing material flows downward and flows into the brazing material inflow grooves (62) and (63). Therefore, it is prevented from flowing into the passage (33a) of the heat exchange pipe (33) through the lower end portion in the communication hole (44) of the intermediate plate (38), and it is possible to prevent passage clogging. become. Moreover, it is possible to easily arrange the temporarily fixed products during brazing.

  The evaporator (30) constitutes a supercritical refrigeration cycle together with an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the compressor, the gas cooler, the decompressor and the gas cooler and the refrigerant coming out of the evaporator. For example, it is installed in a car.

In the evaporator (30) described above, the liquid-phase CO ₂ that has been decompressed through the expansion valve serving as the decompressor passes through the coolant inflow passage (52) of the inlet / outlet member (51) from the coolant inlet (48). It enters into the hollow part (1A) of the inlet header part (1) of the header tank (31), and flows into the left side of the header tank (31), and then diverts to the right side of the front heat exchange pipe group (56A). ) Into the refrigerant passage (33a).

The CO _{2 that} has flowed into the refrigerant passage (33a) of the heat exchange pipe (33) of the front heat exchange pipe group (56A) flows downward in the refrigerant passage (33a), and the front intermediate header of the lower header tank (32). Flows into the right part of the hollow part (5A) of the part (5), flows to the left inside, and divides the refrigerant passage (33) of the heat exchange pipe (33) on the left side of the front heat exchange pipe group (56A) ( Flows into 33a).

The CO ₂ flowing into the refrigerant passage (33a) of the heat exchange pipe (33) on the left side of the front heat exchange pipe group (56A) changes the flow direction and flows upward in the refrigerant passage (33a) to move to the upper header tank. (31) enters the hollow portion (3A) of the front intermediate header portion (3), passes through the refrigerant turn communication portion (45) of the intermediate plate (38), the hollow portion of the rear intermediate header portion (4) ( Enter 4A). The CO _{2 that} has flowed into the hollow portion (4A) of the rear intermediate header portion (4) flows into the refrigerant passage (33a) of the heat exchange pipe (33) on the left side of the rear heat exchange pipe group (56B). Change the flow direction, flow downward in the refrigerant passage (33a) and flow into the left part of the hollow part (6A) of the rear intermediate header part (6) of the lower header tank (32), And flows into the refrigerant passage (33a) of the heat exchange pipe (33) on the right side of the rear heat exchange pipe group (56B).

The CO ₂ flowing into the refrigerant passage (33a) of the heat exchange pipe (33) on the right side of the rear heat exchange pipe group (56B) changes its flow direction and flows upward in the refrigerant passage (33a) to become the upper header. It enters the hollow part (2A) of the outlet header part (2) of the tank (31), flows to the right inside thereof, passes through the refrigerant outlet (49) and the refrigerant outlet path (53) of the inlet / outlet member (51). leak. Then, while CO ₂ flows in the refrigerant passage (33a) of the heat exchange pipe (33), heat exchange is performed with the air flowing in the direction indicated by the arrow A in FIG. .

Embodiment 2
This embodiment is shown in FIGS. 11 to 13, and the heat exchanger according to the present invention is applied to a gas cooler of a supercritical refrigeration cycle.

  FIG. 11 shows the overall configuration of a gas cooler to which the heat exchanger according to the present invention is applied, and FIGS. 12 and 13 show the configuration of the main part of the gas cooler.

In FIGS. 11 to 13, a gas cooler (70) of a supercritical refrigeration cycle using a supercritical refrigerant, for example, CO ₂ , is provided with two header tanks (71) (71) ( 72) and a plurality of flat heat exchange pipes (73) extending in the left-right direction with the width direction facing in the front-rear direction and spaced in the vertical direction between both header tanks (71), (72), Corrugated fins (74) made of aluminum brazing sheet brazed to the heat exchange pipe (73) arranged outside the heat exchange pipe (73) between the upper and lower ends and the ventilation gap between adjacent heat exchange pipes (73) And aluminum side plates (75) brazed to the corrugated fins (74) and disposed on the outer sides of the corrugated fins (74) at both upper and lower ends.

  The right header tank (71) includes an aluminum brazing sheet outer plate (76) having a brazing layer on both sides, an aluminum brazing sheet inner plate (77) having a brazing layer on both sides, and an outer plate (76). An intermediate plate (78) made of aluminum bare material arranged between the inner plate (77) and a brazed stack is formed, and an inlet header portion (80A) and an outlet header portion (80B) ) Are provided side by side.

  A plurality of dome-shaped outward bulges (81A) (81B) extending in the vertical direction on the outer plate (76) of the right header tank (71) and having the same bulge height, length and width. ) Are formed at intervals in the vertical direction. An opening facing the left side of the internal space (not shown) of both outwardly bulging portions (81A) (81B) in the outer plate (76) is closed by an intermediate plate (78). A refrigerant inlet (82) is formed at the top end of the top part of the upper outer bulge (81A) of the outer plate (76), and a refrigerant inflow passage leading to the refrigerant inlet (82) on the outer surface of the outer plate (76). A rectangular parallelepiped inlet member (83) made of metal (here, aluminum bare material) having (84) is brazed using a brazing material on the outer surface of the outer plate (76). Further, a refrigerant outlet (85) is formed at the lower end of the top of the lower outer bulging portion (81B), and a refrigerant outflow passage (87) leading to the refrigerant outlet (85) is formed on the outer surface of the outer plate (76). A rectangular parallelepiped outlet member (86) made of a metal having the following structure, here made of aluminum bear, is brazed using a brazing material on the outer surface of the outer plate (76). The outer plate (76) is formed by pressing an aluminum brazing sheet having a brazing material layer on both sides.

  In the inner plate (77) of the right header tank (71), a plurality of through-tube insertion holes (88) elongated in the front-rear direction are formed at intervals in the vertical direction. The plurality of tube insertion holes (88) in the upper half are formed in the vertical range of the upper outward bulge portion (81A) of the outer plate (76), and the plurality of tube insertion holes in the lower half (the same) 88) is formed within the vertical range of the lower outward bulging portion (81B) of the outer plate (76). The length in the front-rear direction of the tube insertion hole (88) is slightly longer than the width in the front-rear direction of each outward bulge (81A) (81B), and both front and rear ends of the tube insertion hole (88) are outside. It protrudes outward from the front and rear side edges of the side bulging portions (81A) and (81B). Also, it protrudes to the right and left side edges of the inner plate (77) to the right, the tip reaches the outer surface of the outer plate (76), and covers both the front and rear side surfaces of the outer plate (76) and the intermediate plate (78). A covering wall (89) is integrally formed and is brazed to both the front and rear side surfaces of the outer plate (76) and the intermediate plate (78). A plurality of engaging portions (91) projecting inward in the front-rear direction and engaging directly with the outer surface of the outer plate (76) are provided on the protruding edges of the respective covering walls (89) of the inner plate (77) in the vertical direction. Are integrally formed at intervals and are brazed to the outer plate (76). The inner plate (77) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  In the middle plate (78) of the right header tank (71), the tube insertion hole (88) of the inner plate (77) is inserted into the inner space of each outer bulge (81A) (81B) of the outer plate (76). The same number of through-hole communication holes (92) as the pipe insertion holes (88) are formed, and a plurality of communication holes arranged in the length direction of the right header tank (71) on the intermediate plate (78) One communication hole row (94) consisting of (44) is provided. Each communication hole (92) is formed at a position corresponding to each tube insertion hole (88) of the inner plate (77), and the communication hole (92) is slightly larger than the tube insertion hole (88). Yes. The plurality of tube insertion holes (88) in the upper half of the inner plate (77) are connected to the outer plate via the upper communication holes (92) in the communication hole row (94) of the intermediate plate (78). The plurality of lower tube insertion holes (88) in the communication hole row (94) are communicated with the inner space of the upper outer bulging portion (81A) of (76), and the lower half of the intermediate plate (78). This is communicated with the inner space of the lower outward bulging portion (81B) of the outer plate (76) through a plurality of communication holes (92). All communication holes (92) leading to the internal space of the upper outer bulge (81A) of the outer plate (76) and all communication holes (92) leading to the internal space of the lower outer bulge (81B) ) Are communicated with each other by a communicating portion (93) formed by cutting a central portion in the front-rear direction of a portion between adjacent communicating holes (92) in the intermediate plate (78). And the communication part (93) which connects all the communication holes (92) which lead to the internal space of each outward bulge part (81A) (81B) of an outside plate (76), and the direction of order of a communication hole (92) Refrigerant circulation part (78A) (78B) which flows into the inner space of each outward bulge part (81A) (81B) of the outer plate (76) and the refrigerant flows in the vertical direction by the middle part (78) Is formed.

  Lead to the front and rear outer ends of each communication hole (92) in the communication hole row (94) in the part corresponding to all the communication holes (92) on the surface of the intermediate plate (78) facing the inner plate (77) In addition, a brazing material inflow groove (95) extending outward in the front-rear direction and reaching both the front and rear side surfaces of the intermediate plate (78) is formed.

  And the inlet header part (80A) is formed by the part corresponding to the upper outward bulge part (81A) in the three plates (76), (77), (78) of the right header tank (71). An exit header portion (80B) is formed by a portion corresponding to the lower outward bulge portion (81B) in the three plates (76), (77), and (78) of the header tank (71). Opened to the left by the internal space of both outwardly bulging portions (81A) (81B) of the outer plate (76) and the refrigerant circulation portions (78A) (78B) of the intermediate plate (78), and the opening is on the inner side. A hollow portion (not shown) of the inlet header portion (80A) and the outlet header portion (80B) blocked by the plate (77) is formed.

  The left header tank (72) has substantially the same configuration as the right header tank (71), and the same components and the same parts are denoted by the same reference numerals. Both header tanks (71) (72) are arranged so that the inner plates (77) face each other.

  The outer plate (76) of the left header tank (72) is one less than the number of outward bulges (81A) (81B) of the right header tank (71), here one domed outer A bulging portion (96) is formed from the upper end portion to the lower end portion of the outer plate (76) so as to straddle both outer bulging portions (81A) (81B) of the right header tank (71). The opening facing the right side of the outward bulge portion (96) of the outer plate (76) is closed by the intermediate plate (78). As a result, the outer bulging portion (96) has an inner space (96a) in which both upper and lower ends are closed and the refrigerant flows in the vertical direction. A refrigerant inlet and a refrigerant outlet are not formed in the outward bulge portion (96).

  All pipe insertion holes (88) of the inner plate (77) of the left header tank (72) are formed within the vertical direction of the outward bulge (96) of the outer plate (76) All the pipe insertion holes (88) of the plate (77) are connected to the refrigerant flow in the outward bulging part (96) of the outer plate (76) through all the communication holes (92) of the intermediate plate (78). Part (24a). All the communication holes (92) of the intermediate plate (78) are formed by the communication portions (93) formed by cutting out the central part in the front-rear direction of the portion between the adjacent communication holes (92) in the intermediate plate (78). Communicated. And a communicating part (93) for communicating all the communicating holes (92) of the communicating hole row (94) communicating with the internal space (96a) of the outward bulging part (96) of the outer plate (76), and a communicating hole (92) The refrigerant flow section (92) that passes through the inner space (96a) of the outer bulging portion (96) of the outer plate (76) and flows in the left-right direction ( 78C) is formed.

  Then, two header parts (72) of the right header tank (71) are formed by the portions corresponding to the outward bulge parts (96) in the three plates (76) (77) (78) constituting the left header tank (72). One intermediate header portion (97), which is one less than 80A) and (80B), is formed so as to straddle both header portions (80A) and (80B) of the right header tank (71). Due to the internal space (96a) of the outward bulging portion (96) of the outer plate (76) and the refrigerant circulation portion (78C) of the intermediate plate (78), the opening is opened to the right and the opening is the inner plate (77). A hollow portion (not shown) of the intermediate header portion (97) that is blocked by is formed.

  The heat exchange pipe (73) and the corrugated fin (74) have the same configuration as the heat exchange pipe (33) and the corrugated fin (34) used in the evaporator (30) of the first embodiment.

  Both header tanks (71) and (72) are manufactured as follows.

  First, an outer plate (76) having outwardly bulging portions (81A) (81B) (96) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides. A refrigerant inlet (82) and a refrigerant outlet (85) are formed in the outer plate (76) of the right header tank (71). In addition, by pressing the aluminum brazing sheet having a brazing filler metal layer on both sides, it is used to form an engaging part that is connected straight to the tube insertion hole (88), the covering wall (89), and the side surface covering wall (89). Inner plates (77) of both header tanks (71) (72) having projecting pieces (91A) are formed. Furthermore, the intermediate plate (78) having the communication hole (92), the communication part (93), and the refrigerant flow parts (78A) (78B) (78C) is formed by pressing the aluminum bear material.

  Next, after combining the three plates (76), (77), (78) in a laminated form, the protruding piece (91A) is bent to form the engaging portion (91), and the engaging portion (91) is connected to the outer plate (91). Engage with (76) to make a temporary fixing body. An inlet member (83) and an outlet member (86) are arranged on the outer surface side of the outer plate (76) of the temporary fixing body for the right header tank (71), and the inlet member (83) and the outlet member are arranged by appropriate means. Temporarily fix (86) to the temporary fixing body. Thereafter, the three plates (76), (77) and (78) are brazed to each other using the brazing material layer of the outer plate (76) and the brazing material layer of the inner plate (77), and the covering wall (89) Are brazed to the front and rear side surfaces of the intermediate plate (78) and the outer plate (76), and the engaging portion (91) is brazed to the outer plate (36). Further, the inlet member (83) and the outlet member (84) are brazed to the outer plate (76) using the brazing material layer of the outer plate (76) of the temporary fixing body for the right header tank (71). Thus, both header tanks (71) (72) are manufactured.

  The gas cooler (70) is prepared by preparing the above-mentioned two temporary fixing bodies when manufacturing the header tanks (71) and (72), a plurality of heat exchange pipes (73) and corrugated fins (74), Temporary fixing bodies are arranged at intervals so that the inner plates (77) face each other, a plurality of heat exchange tubes (73) and corrugated fins (74) are arranged alternately, heat exchange tubes ( 73) are inserted into the tube insertion holes (88) of the inner plates (77) of both temporary fixing bodies, and side plates (75) are arranged outside the corrugated fins (74) at both ends. After making the combined body, put the combined body into a posture in which the heat exchange tube (73) faces the width direction in the vertical direction, and attach the three plates (76), (77), (78) of the temporary fixing body to each other. The header tanks (71) and (72) are formed by brazing, and at the same time, the heat exchange pipe (73) is attached to the header tanks (71) and (72), and the fin (74) is attached to the heat exchange pipe (7 In 3), the side plate (75) is brazed to the fin (74), and the inlet member (83) and the outlet member (84) are brazed to the right header tank (71).

  In manufacturing the gas cooler (70), after temporarily fixing all the parts in combination, brazing with the posture in which the width direction of the heat exchange pipe (73) faces the vertical direction, the inner plate (77) and the intermediate plate ( 78), the molten brazing material flows downward and flows into the brazing material inflow groove (95) located on the lower side. Therefore, it is possible to prevent passage through the lower end portion in the communication hole (82) of the intermediate plate (78) into the passage of the heat exchange pipe (73), thereby preventing passage clogging. Furthermore, when brazing in a posture such that the width direction of the heat exchange pipe (73) faces the vertical direction, the inner plate (77) And the intermediate plate (78), the molten brazing material flows downward and flows into the brazing material inflow groove (95). Therefore, it is possible to prevent passage through the lower end portion in the communication hole (82) of the intermediate plate (78) into the passage of the heat exchange pipe (73), thereby preventing passage clogging. Moreover, it is possible to easily arrange the temporarily fixed products during brazing.

  The gas cooler (70) constitutes a supercritical refrigeration cycle together with an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the compressor and the evaporator, the decompressor and the gas cooler and the refrigerant coming out of the evaporator. For example, it is installed in a car.

In the above-described gas cooler (70), the CO ₂ that has passed through the compressor passes through the refrigerant inflow path (84) of the inlet member (83) from the refrigerant inlet (82) to the inlet header portion (80A of the right header tank (71)). ) In the hollow part of the outer plate, the refrigerant circulation part (81A) of the outer plate (76) and the refrigerant circulation part (78A) of the intermediate plate (78) are divided while flowing downward, and the heat exchange pipe (73) of the upper half part Flows into the passage. The CO ₂ flowing into the passage flows leftward in the passage and flows into the upper half of the hollow portion of the intermediate header portion (97) of the left header tank (72). The CO ₂ flowing into the upper half of the hollow portion of the intermediate header portion (97) flows downward through the internal space (96a) of the outer plate (76) and the refrigerant circulation portion (78C) of the intermediate plate (78). The middle header (97) splits in the lower half of the hollow part and flows into the passage of the heat exchange pipe (73) in the lower half, changes the flow direction and flows to the right in the passage to the right header. It enters into the hollow part of the outlet header part (80B) of the tank (71). Thereafter, CO ₂ flows downward through the refrigerant circulation part (81B) of the outer plate (76) and the refrigerant circulation part (78b) of the intermediate plate (78), and the refrigerant flows out of the refrigerant outlet (85) and the outlet member (86). It flows out through the road (87). Then, while CO ₂ flows in the refrigerant passage (4a) of the heat exchange pipe (73), heat exchange is performed between the ventilation gap and air flowing in the direction indicated by the arrow Y in FIG.

  In the second embodiment, the outwardly bulging portions (81A), (81B), and (96) of the outer plates (76) of the header tanks (71) and (72) are dome-shaped, but the present invention is not limited to this. Rather, the outward bulges of the outer plates (76) of both header tanks (71) and (72) are formed by bending the central portion of the outer plates (76) outwardly, and both ends are open. It may have an internal space. In this case, both end portions of the internal space are closed by the closing members disposed in the header tanks (71) and (72), and the right header tank (71) is closed by the closing members disposed in the central portion in the length direction. The internal space is partitioned into two upper and lower parts.

  In the above two embodiments, the number of the intermediate plates (38) (78) of the header tanks (31) (32) (71) (72) is 1, but the number of the intermediate plates (38) (78) is not limited to this. A plurality of intermediate plates (38), (78) may be interposed between the inner plates (37), (77) and 36) (76). In this case, communication holes (44) (82), communication parts (45) (46) (93), brazing material inflow grooves (62) (63) (95), etc. are formed in each intermediate plate (38) (78). Is done.

  In the above two embodiments, the heat exchanger according to the present invention is applied to an evaporator and a gas cooler of a supercritical refrigeration cycle. However, the present invention is not limited to this, and the heat exchanger according to the present invention is not limited to other refrigeration cycles. May also apply to cycles.

Furthermore, in the above embodiment, CO ₂ is used as the supercritical refrigerant in the supercritical refrigeration cycle, but is not limited to this, and ethylene, ethane, nitric oxide, or the like is used.

It is a perspective view which shows the whole structure of the evaporator of Embodiment 1 to which the heat exchanger of this invention is applied. FIG. 2 is a partially omitted vertical sectional view of the rear portion of the evaporator of FIG. It is the AA line expanded sectional view which abbreviate | omitted a part 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 which shows the right end part of the upper header tank in the evaporator of FIG. It is a disassembled perspective view which shows the part of the upper header tank of the evaporator of FIG. It is the DD sectional view taken on the line of FIG. It is a disassembled perspective view which shows the part of the lower header tank of the evaporator of FIG. It is a figure which shows the flow of the molten brazing material at the time of manufacturing the evaporator of FIG. It is a perspective view which shows the whole structure of the gas cooler of Embodiment 2 to which the heat exchanger of this invention is applied. It is a disassembled perspective view which shows the part of the right header tank of the gas cooler of FIG. It is a disassembled perspective view which shows the part of the left header tank of the gas cooler of FIG. It is a figure equivalent to FIG. 10 which shows the conventional problem.

Explanation of symbols

(1) (2) (3) (4) (5) (6): Header
(1A) (2A) (3A) (4A) (5A) (6A): Hollow part
(30): Evaporator
(31) (32): Header tank
(33): Heat exchange pipe
(36): Outer plate
(37): Inside plate
(38): Intermediate plate
(41): Tube insertion hole
(44): Communication hole
(61A) (61B): Communication hole row
(62) (63): Brazing material inflow groove
(70): Gas cooler
(71) (72): Header tank
(73): Heat exchange tube
(76): Outer plate
(77): Inside plate
(78): Intermediate plate
(88): Tube insertion hole
(92): Communication hole
(94): Communication hole row
(95): Brazing material inflow groove

Claims (3)

A pair of header tanks arranged at a distance from each other, and between the header tanks, the width direction is directed in the front-rear direction and the header tanks are arranged at intervals in the length direction, and both end portions are both headers. 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. In each header tank, at least one header portion having a hollow portion through which a refrigerant flows is formed, and a plurality of tubes that are long in the front-rear direction are inserted into portions corresponding to the hollow portion of the header portion in the inner plate Holes are formed in a penetrating manner at intervals in the length direction of the inner plate, and the middle plate is long in the front-rear direction and forms a part of the hollow portion, and the inner plate Through holes are formed to penetrate each rate tube insertion hole into the hollow portion of the header, and both ends of the heat exchange tubes are inserted into the tube insertion holes of the inner plates of both header tanks and brazed to the inner plate. In addition, in the heat exchanger in which both ends of the heat exchange pipe are located in the intermediate portion in the thickness direction of the intermediate plate in the communication hole of the intermediate plate of both header tanks,
A heat exchanger in which a brazing material inflow groove extending in the front-rear direction and extending to at least one end of the communication hole is formed in a portion corresponding to each communication hole on a surface facing the inner plate side of the intermediate plate. The intermediate plate is provided with a plurality of rows of communicating holes made of a plurality of communicating holes arranged in the length direction of the header tank at intervals in the front-rear direction, and communication holes adjacent to the front and rear are arranged in the length direction of the header tank. The front and rear communication holes are separated from each other in at least some of the sets of the two communication holes formed in the same position and adjacent to each other in the front and rear, and the inner plate side of the intermediate plate is In the facing surface, a brazing material inflow groove through which the front end in the front-rear direction of the communication hole in the communication hole row located at both front and rear ends and the front and rear side surfaces of the intermediate plate, and the communication holes adjacent to each other in the front and rear are separated from each other. The heat exchanger according to claim 1, wherein a brazing material inflow groove is formed through the inner ends in the front-rear direction. The intermediate plate is provided with a row of communication holes composed of a plurality of communication holes arranged in the length direction of the header tank, and is connected to the front and rear ends of each communication hole on the surface facing the inner plate side of the intermediate plate. The heat exchanger according to claim 1, wherein a brazing material inflow groove extending in the front-rear direction is formed.

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