JP2009008347A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving pressure resistance, and increasing joint strength between a head tank and heat exchange tubes while suppressing an increase of weight. <P>SOLUTION: A header tank of a gas cooler applied to this heat exchanger comprises: a tank body 7 formed of an aluminum extruded section, and having a plurality of fluid passages 9 arranged in the width direction; and a tube connecting plate 8 formed of an aluminum brazing sheet, covering the surface of the tank body 7 directed inward, and jointed to the tank body 7. At the tank body 7, a plurality of tube insertion holes 11 for inserting ends of the heat exchange tubes 4, and a plurality of communication holes 12 continued to the outside of the tube insertion holes 11 and used for making the fluid passages 9 adjacent to each other communicate with each other are formed. The thickness of an inner part of the tank body 7 relative to the fluid passages 9 is set the largest at the center in the width direction, and gradually reduced toward both side edges. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  In this specification and claims, the term “inside” and “outside” is different from the inside in the front and rear direction, the outside in the front and rear direction, the inside in the up and down direction, the outside in the up and down direction, the inside of the hole, and the inside of the passage. It shall be based on the length direction. For example, the left side of FIGS. 3 to 6 is referred to as “inside”, and the right side is also referred to as “outside”. In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

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

  The present application as a heat exchanger used in a supercritical refrigeration cycle including a compressor, a gas cooler, an evaporator, a decompressor, and an intermediate heat exchanger for exchanging heat between the refrigerant coming out of the gas cooler and the refrigerant coming out of the evaporator The person is first arranged with a pair of header tanks arranged in the width direction in the ventilation direction and spaced apart from each other, and in the length direction of the header tank between the two header tanks, and at both ends. Each section includes a plurality of heat exchange pipes joined to the header tank, and at least one of the header tanks covers a tank body having a plurality of fluid passages and a surface facing the inside of the tank body. It consists of a pipe connecting plate made of aluminum brazing sheet joined to the tank body. The length direction of the header tank is a plurality of tube insertion holes that reach the middle portion of the heat exchange tube and into which the end of the heat exchange tube is inserted, and a plurality of communication holes that are connected to the outside of the tube insertion hole and through adjacent fluid passages The partition wall between the fluid passages adjacent to each other is formed in the portion where the tube insertion hole and the communication hole are formed, and a plurality of tube insertions leading to the tube insertion hole of the tank body are formed in the tube connection plate. The through holes are formed at intervals in the length direction of the header tank, and the heat exchange pipe is inserted into the pipe insertion through hole of the pipe connection plate and inserted into the pipe insertion hole of the tank body. There has been proposed a heat exchanger that is joined to the pipe connection plate and the tank body, and in which the thickness of the inner portion of the fluid passage in the tank body is the same as the whole (see Patent Document 1).

However, in a supercritical refrigeration cycle using a supercritical refrigerant such as CO ₂ , the pressure resistance of the heat exchanger is improved as compared with a refrigeration cycle using a fluorocarbon refrigerant, and the header tank and the heat exchange pipe are It is necessary to increase the brazing area to increase the joint strength between the two. Therefore, in the heat exchanger described in Patent Document 1, it is necessary to increase the thickness of the inner portion of the fluid passage in the tank body. However, since the thickness of the inner portion of the fluid passage in the tank body is equal to the whole, the header There is a problem that the weight of the tank, and thus the weight of the entire heat exchanger, increases.
JP 2003-214793 A

  An object of the present invention is to provide a heat exchanger capable of solving the above-described problems and improving pressure resistance while suppressing an increase in weight and increasing a bonding strength between a header tank and a heat exchange pipe. .

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

1) A pair of header tanks arranged in the width direction in the ventilation direction and spaced from each other, and arranged in the header tank length direction between both header tanks, and both ends are headers A plurality of heat exchange pipes joined to the tank, and at least one of the header tanks covers a tank body having a plurality of fluid passages and a surface facing the inside of the tank body, and is joined to the tank body. A plurality of tube insertion holes into which the end of the heat exchange tube is inserted into the tank body from the inner surface of the tank body to the intermediate portion in the inner and outer directions, A plurality of communication holes that extend to the outside of the pipe insertion hole and allow adjacent fluid passages to pass through are formed at intervals in the length direction of the header tank. The partition wall between adjacent fluid passages is cut off at the part where the communication hole is formed, and the pipe connection plate has a plurality of through holes for pipe insertion leading to the pipe insertion holes of the tank body in the length direction of the header tank. Formed at intervals, the heat exchange pipe is passed through the pipe insertion through hole of the pipe connection plate and joined to the pipe connection plate and the tank main body in a state of being inserted into the pipe insertion hole of the tank main body. In the heat exchanger,
The tank body is made of an extruded aluminum material in which a plurality of fluid passages are formed side by side in the width direction, and the thickness of the inner part of the tank body from the fluid passage is the thickest at the center in the width direction, and both side edges Heat exchanger that becomes thinner toward the part.

  2) The cross-sectional shape of the surface facing the inside of the tank body is an arc shape with the center in the width direction protruding inward, and the inner ends of all fluid passages are located in the same plane 1) The described heat exchanger.

  3) The pipe insertion hole and communication hole of the tank body are longer in the width direction of the header tank, and the length of the communication hole is shorter than the length of the pipe insertion hole, communicating with both ends of the pipe insertion hole. The heat exchanger according to 1) or 2), wherein stepped portions are respectively formed between both end portions of the hole.

  4) The pipe insertion hole and communication hole of the tank main body, and the pipe insertion through hole of the pipe connection plate are elongated in the width direction of the header tank, extending in the length direction of the pipe insertion hole on the inner surface of the tank main body. Concave portions are formed on both side parts, projecting toward the tank body side and extending into the tank body recesses on both side edges extending in the length direction of the pipe insertion through hole on the surface of the pipe connection plate facing the tank body side The heat exchanger according to any one of 1) to 3) above, wherein a bent portion is formed.

  5) A pipe connection plate is provided on the side cover that covers both sides of the tank body, and on the tip of the side cover, and engages with the side edge of the tank body on the side opposite to the heat exchange tube side. 5. The heat exchanger according to any one of 1) to 4) above, which has an engaging portion that performs.

  6) The outer surface of the tank body is covered with a plate made of an aluminum brazing sheet having at least a brazing filler metal layer on the outer surface side, and the plate is joined to the tank body, any one of the above 1) to 4) The heat exchanger as described in.

  7) The heat exchanger according to 6) above, wherein the outer end of the communication hole is open to the outer surface of the tank body, and the tube insertion hole and the communication hole connected to the tube insertion hole are formed in a penetrating shape.

  8) The heat exchanger according to 6) or 7) above, wherein other parts are brazed to the outer surface of the plate using the brazing material layer of the plate.

  9) The above 6) to 6), wherein the pipe connecting plate has a side surface covering portion that covers both side surfaces of the tank body, and an engaging portion that is provided at the tip of the side surface covering portion and that engages with both side edges of the outer surface of the plate. The heat exchanger according to any one of 8).

  According to the heat exchangers of the above 1) and 2), the tank body is made of an aluminum extruded shape member in which a plurality of fluid passages are formed side by side in the width direction. However, since it is the thickest at the center in the width direction and is thinner toward the side edges, the pressure resistance is improved while suppressing an increase in weight compared to the heat exchanger described in Patent Document 1. The joining strength between the header tank and the heat exchange pipe can be increased.

  According to the heat exchanger of 3) above, it is possible to easily position the heat exchange pipe by bringing the end of the heat exchange pipe into contact with the stepped portion during manufacture.

  According to the heat exchanger of 4), the bent portion of the pipe connection plate serves as a guide for passing the heat exchange pipe through the pipe insertion through hole of the pipe connection plate, so that workability is improved. Moreover, when the thickness of the inner portion of the tank body from the fluid passage is the thickest at the center in the width direction and gradually decreases toward the side edges, the tank body faces the heat exchange tube side. Even if a concave portion into which the bent portion of the pipe connection plate enters is formed on the surface, it is possible to suppress a decrease in pressure resistance of the header tank.

  According to the heat exchanger of 5) above, the bonding strength between the tank main body and the pipe connecting plate is larger than the bonding strength between the tank main body and the pipe connecting plate of the heat exchanger described in Patent Document 1, and the header The pressure resistance of the tank is improved.

  According to the heat exchanger of 6), it is possible to braze other parts such as an inlet member, an outlet member, and a bracket using the brazing material on the outer surface side of the plate made of an aluminum brazing sheet.

  According to the heat exchanger of the above 7), the tube insertion hole and the communication hole can be formed relatively easily in the tank body.

  According to the heat exchanger of 9) above, the bonding strength between the tank body and the pipe connection plate and the plate is greater than the bonding strength between the tank body and the pipe connection plate of the heat exchanger described in Patent Document 1. The pressure resistance of the header tank is improved.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the heat exchanger according to the present invention is applied to a gas cooler of a supercritical refrigeration cycle.

  In the following description, the downstream side (the direction indicated by the 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. The top and bottom and the left and right in FIG.

  1 and 2 show the overall configuration of the gas cooler of the supercritical refrigeration cycle, FIGS. 3 to 7 show the configuration of the main parts, and FIGS. 8 and 9 show the method for manufacturing the header tank.

1 and 2, the gas cooler (1) of a supercritical refrigeration cycle that uses a supercritical refrigerant, for example, CO ₂ , is spaced in the left-right direction and disposed in the width direction in the front-rear direction, and in the up-down direction. Two header tanks (2) and (3) that extend, and a plurality of flat heat exchange tubes (4) that are arranged in parallel between the two header tanks (2) and (3) in the vertical direction, Corrugated fins (5) that are arranged on the outside in the vertical direction of the heat exchange pipes (4) at the upper and lower ends and brazed to the heat exchange pipes (4), and the ventilation gap between adjacent heat exchange pipes (4) And an aluminum side plate (6) brazed to the corrugated fins (5) and disposed on the outer sides in the vertical direction of the corrugated fins (5) at both upper and lower ends. In this embodiment, the right header tank (2) is referred to as a first header tank, and the left header tank (3) is referred to as a second header tank.

  The first header tank (2) is formed of an aluminum extruded shape tank body (7) whose width direction is the front-rear direction and a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet, and the tank. A pipe connection plate (8) brazed to the tank body (7) so as to cover the left side surface (the surface facing inward) of the body (7).

  As shown in FIGS. 2 to 7, a plurality of fluid passages (9) are formed in the tank body (7) side by side in the width direction (front-rear direction). The cross-sectional shape of the fluid passage (9) is a rectangular shape that is long in the left-right direction, and its left and right end faces (inner and outer end faces) are located in the same vertical plane. In addition, the cross-sectional shape of the left surface (surface facing inward) of the tank body (7) is an arcuate shape with the center in the width direction protruding to the left (inside), and the fluid passage (9 ) Is thickest at the center in the width direction and gradually becomes thinner toward the front and rear side edges.

  The tank body (7) is connected to a plurality of long tube insertion holes (11) extending in the front-rear direction into which the right end of the heat exchange tube (4) is inserted, and to the right side (outside) of the tube insertion hole (11). A plurality of communication holes (12) through which the matching fluid passages (9) pass are formed in the vertical direction (the length direction of the first header tank (2)) with an interval therebetween. The pipe insertion hole (11) is formed so as to extend from the left surface of the tank main body (7) to the middle portion in the left-right direction, and the communication hole (12) is connected to the right end of the pipe insertion hole (11). ) In the middle of the thickness of the outer portion (7b) rather than the fluid passage (9). In the portion where the tube insertion hole (11) and the communication hole (12) are formed, the partition wall (13) between the adjacent fluid passages (9) is cut out over the entire height, and all the fluids are separated by the communication hole (12). The passages (9) are connected to each other. The length in the front-rear direction of the communication hole (12) is slightly shorter than the length in the front-rear direction of the tube insertion hole (11), and both front and rear end surfaces of the communication hole (12) and both front and rear ends of the tube insertion hole (11) A positioning step (14) with which the end of the heat exchange tube (4) abuts is formed between the surfaces. The vertical width of the communication hole (12) is equal to the vertical width of the tube insertion hole (11). In addition, a concave portion (15) is formed in each of the upper and lower side portions extending in the hole length direction of the tube insertion hole (11) on the surface facing the left side of the tank body (7). The bottom surface of the recess (15) is inclined inward in the vertical direction toward the right side.

  A brazing filler metal layer is placed on both sides of the pipe insertion holes (11) and communication holes (12) at the upper and lower ends of the tank body (7) and the pipe insertion holes (11) and communication holes (12) at the center in the vertical direction. A partition plate (16) made of an aluminum brazing sheet is inserted from the left side and brazed to the tank body (7), whereby the upper and lower ends of the fluid passage (9) of the tank body (7) are closed. In addition, the fluid passage (9) is partitioned into upper and lower portions (9A) (9B). The partition plate (16) is formed integrally with the first portion (16a) located in each communication hole (12) and the left edge of the first portion (16a) when viewed from the outside in the vertical direction, and left And a second portion (16b) positioned in the tube insertion hole (11) (see FIG. 6). The left surface (surface facing inward) of the second part (16b) of the partition plate (16) has an arcuate cross section similar to the left surface of the tank body (7), and is flush with the left surface of the tank body (7). It has become. The front and rear ends of the second portion (16b) of the partition plate (16) protrude in the front-rear direction from the front and rear ends of the first portion (16a), and the right end of the protruding portion is the step (14). Abut. The upper part of the tank body (7) above the partition plate (16) at the center in the vertical direction is the inlet header part (17), and the lower part is the outlet header part (18), resulting in the fluid passage (9). The upper portion (9A) is a refrigerant circulation portion (17A) of the inlet header portion (17), and the lower portion (9B) is a refrigerant circulation portion (18A) of the outlet header portion (18).

  A pipe insertion through hole (19) that is long in the front-rear direction is formed at a position corresponding to each pipe insertion hole (11) of the tank body (7) in the pipe connection plate (8). The plurality of pipe insertion through holes (19) in the upper half are formed within the vertical range of the upper part (9A) of the fluid passage (9) of the tank body (7), and The pipe insertion through hole (19) is formed in the vertical range of the lower portion (9B) of the fluid passage (9) of the tank body (7). In addition, on the side of the tank body (7) side that extends in the hole length direction of the pipe insertion through hole (19) on the surface (right side) of the pipe connection plate (8) facing the tank body (7) side A bent portion (21) is formed which protrudes into the concave portion (15) of the tank body (7). The bent portion (21) is inclined inward in the vertical direction toward the outside.

  A refrigerant inlet (22) is formed at a height position slightly below the heat exchange pipe (4) at the upper end of the outer part (7b) of the tank body (7) so as to communicate with the fluid passage (9), An aluminum rectangular parallelepiped inlet member (23) having a refrigerant inflow passage (24) communicating with the refrigerant inlet (22) is brazed to the right surface of the outer portion (7b) of the tank body (7). In addition, a refrigerant outlet (25) is formed at a height slightly above the heat exchange pipe (4) at the lower end of the tank body (7) so as to communicate with the fluid passage (9), and the tank body (7 A rectangular parallelepiped outlet member (26) having a refrigerant outflow passage (27) leading to the refrigerant outlet (25) is brazed to the outer surface of the outer peripheral surface of (2). The inlet member (23) and the outlet member (26) are respectively formed with screw holes (28) and (29) extending forward from the rear surface. In the supercritical refrigeration cycle, the screw hole (28) of the inlet member (23) 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 (26). (29) is used for screwing the joint member attached to the tip of the pipe extending from the intermediate heat exchanger.

  Side covering walls that protrude to the right on both the front and rear edges of the pipe connection plate (8), with the tip reaching the right side (outer surface) of the tank body (7) and covering both the front and rear sides of the tank body (7) (31) is integrally formed and brazed to both front and rear side surfaces of the tank body (7). A plurality of engaging claws (32) projecting inward in the front-rear direction and engaging with the right surface of the tank body (7) are integrally formed on the right edge of each side surface covering wall (31) at intervals in the vertical direction. The tank body (7) is brazed. The pipe connection plate (8) is formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides.

  As shown in FIG. 2, the second header tank (3) has substantially the same configuration as the first header tank (2), and the same components and the same parts are denoted by the same reference numerals. Both header tanks (2) and (3) are arranged so that the pipe connection plates (8) face each other.

  The tank body (7) of the second header tank (3) is provided with partition plates (16) only at the upper and lower ends, and the fluid passage (9) of the tank body (7) is partitioned only at the upper and lower ends. Closed by a plate (16). Thereby, the fluid passage (9) of the tank body (7) is not partitioned vertically. As a result, the tank body (7) of the second header tank (3) spans the inlet header (17) and outlet header (18) of the tank body (7) of the first header tank (2). One intermediate header portion (33) is formed. The fluid passage (9) serves as a refrigerant circulation part (33A) of the intermediate header part (33). The tank body (7) is not formed with a refrigerant inlet and a refrigerant outlet.

  The heat exchange pipe (4) is made of an extruded shape made of metal, here aluminum, and has a flat shape that is wide in the front-rear direction, and a plurality of refrigerant passages (4a) extending in the length direction are formed in parallel in the inside. ing. The refrigerant passage (4a) of the heat exchange pipe (4) communicates with the fluid passage (9) of the tank body (7). Both ends of the heat exchange pipe (4) are passed through the pipe insertion through holes (19) of the pipe connection plates (8) of both header tanks (2) and (3), and the tank body (7) The pipe connection plate (8) and the tank body are inserted into the pipe insertion hole (11) and both ends are in contact with the stepped portion (14) using the brazing material layer of the pipe connection plate (8). It is brazed to (7). All the heat exchange pipes (4) have a right end portion on the upper portion (9A) of the fluid passage (9) of the tank body (7) in the first header tank (2), that is, the refrigerant circulation portion of the inlet header portion (17). A plurality of fluid passages (9) leading to the fluid passage (9) of the tank body (7) in the second header tank (3), that is, the upper half of the refrigerant circulation part (32A) of the intermediate header part (33). And the right end is the lower portion (9B) of the fluid passage (9) of the tank body (7) in the first header tank (2), that is, the outlet header ( 18) and the left end of the fluid passage (9) of the tank body (7) in the second header tank (3), that is, the refrigerant circulation part (32A) of the intermediate header part (33). By dividing it into a heat exchange tube group consisting of a plurality of heat exchange tubes (4) leading to the lower half, it is divided into the first and second paths (P1) (P2). (P1) (P2) The flow direction of the refrigerant in all the heat exchange tubes (4) are together are the same, different two paths (P1) flowing direction of the refrigerant in the heat exchange tubes (4) of the (P2) to be.

  The corrugated fin (5) is formed in a wavy shape using a brazing sheet having a brazing filler metal layer on both sides, here an aluminum brazing sheet.

  Hereinafter, the manufacturing method of a gas cooler (1) is demonstrated with reference to FIG. 8 and FIG.

  First, after forming an aluminum extruded shape member for forming a tank body that does not have a tube insertion hole (11), a communication hole (12), and a recess (15) and has only a plurality of fluid passages (9), the extrusion By applying an appropriate processing method to the profile, the tube insertion hole (11), the communication hole (12), the step (14) and the recess (15) are formed, and both header tanks (2) (3) Make the tank body (7). A refrigerant inlet (22) and a refrigerant outlet (25) are formed in the tank body (7) of the first header tank (2). Also, by pressing the aluminum brazing sheet having a brazing filler metal layer on both sides, the pipe insertion through hole (19), the bent portion (21), the side covering wall (31), and the side covering wall (31) A pipe connecting plate (8) having straight plate engaging claw forming protrusions (32A) is formed.

  Next, the pipe insertion hole (11) and the communication hole (12) at the upper and lower ends of the tank body (7) of the first header tank (2) and the pipe insertion hole (11) and the communication hole at the center in the vertical direction ( 12) Insert the partition plate (16) from the inside. Further, the partition plate (16) is inserted from the inside into the tube insertion hole (11) and the communication hole (12) at both the upper and lower ends of the tank body (7) of the second header tank (3). Next, the pipe connecting plate (8) is overlapped on the inner side surface of the tank body (7) so that the side surface covering wall (31) is along the front and rear side surfaces of the tank body (7). Next, the engaging claw forming protrusion (32A) of the pipe connecting plate (8) is bent inward to form the engaging claw (32) and the engaging claw (32) is attached to the outer surface of the tank body (7). The tank body (7) and the pipe connection plate (8) are temporarily fixed by engaging with both front and rear side edges of the first and second headers by temporarily fixing the partition plate (16). Make temporary fixing bodies for tanks (2) and (3). Further, the inlet member (23) and the outlet member (26) are temporarily fixed to the tank body (7) of the first header tank (2) by appropriate means, and the inlet member (23) and the outlet member (26) An appropriate brazing material is placed between the tank body (7).

  Next, the two temporary fixing bodies are arranged at intervals so that the pipe connecting plates (8) face each other, and a plurality of heat exchange pipes (4) and corrugated fins (5) are arranged alternately. The both ends of the heat exchange pipe (4) are inserted into the pipe insertion holes (11) of the tank body (7) through the pipe insertion through holes (19) of the pipe connection plates (8) of both temporary fixing bodies, respectively. While inserting, side plate (6) is arrange | positioned on the outer side of corrugated fin (5) of both ends, and the assembly of all the parts is obtained by fixing with a suitable jig | tool.

  Thereafter, the assembly is heated to a predetermined brazing temperature, the tank body (7) and the pipe connection plate (8) are brazed using the brazing material layer of the pipe connection plate (8), and the partition is separated. The partition plate (16) is brazed to the tank body (7) using the brazing material layer of the plate (16). At the same time, using the brazing material layer of the pipe connection plate (8), the side surface covering wall (31) and the engaging claws (32) and the tank body (7) are brazed, and the temporary fixing body The first header tank (2) is formed by brazing the inlet member (23) and the outlet member (26) to the tank body (7) by using the brazing material disposed in (1). At the same time, the tank body (7) and the pipe connection plate (8) are brazed using the brazing material layer of the pipe connection plate (8) and the brazing material layer of the partition plate (16) is used. Then, the partition plate (16) is brazed to the tank body (7). At the same time, by using the brazing material layer of the pipe connecting plate (8), the side cover wall (31) and the engaging claws (32) and the tank body (7) are brazed to form the second header. Form the tank (3). At the same time, the brazing material layer of the pipe connecting plate (8) is used to braze the pipe connecting plate (8), the tank body (7), and the heat exchange pipe (4), and corrugated fins. The heat exchange pipe (4) and the corrugated fin (5), and the corrugated fin (5) and the side plate (6) are brazed using the brazing material layer of (5). Thus, the gas cooler (1) is manufactured.

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

In the gas cooler (1) described above, the CO ₂ that has passed through the compressor passes through the refrigerant inflow path (24) of the inlet member (23) and passes through the refrigerant inlet (22) to the tank body (7 in the first header tank (2). ) Enters the refrigerant circulation section (17A) of the inlet header section (17), and flows through the refrigerant circulation section (17A), that is, the upper portion (9A) of the fluid passage (9), while flowing downward, and the first path (P1 ) Flows into the refrigerant passages (4a) of all the heat exchange tubes (4). The CO ₂ flowing into the refrigerant passage (4a) flows to the left through the refrigerant passage (4a), and the refrigerant circulation portion (33A) of the intermediate header portion (33) of the tank body (7) in the second header tank (3). That is, it flows into the upper half of the fluid passage (9). The CO _{2 that} has flowed into the upper half of the refrigerant circulation part (33A) of the intermediate header part (33) flows downward through the refrigerant circulation part (33A) and is divided to all the heat in the second path (P2). The refrigerant flows into the refrigerant passage (4a) of the exchange pipe (4), changes the flow direction, flows to the right through the refrigerant passage (4a), and exits the header body (18) of the tank body (7) in the first header tank (2). ) Enters the refrigerant distribution section (18A). Thereafter, CO ₂ flows downward through the refrigerant circulation part (18A) (the lower part (9B) of the fluid passage (9)) of the outlet header part (18) of the tank body (7), and the refrigerant outlet (25) and It flows out through the refrigerant outflow passage (27) of the outlet member (26). Then, while CO ₂ flows in the refrigerant passage (4a) of the heat exchange pipe (4), the ventilation gap is heat-exchanged with the air flowing in the direction indicated by the arrow X in FIG.

  In the above embodiment, the number of the header portions (17), (18) of the first header tank (2) in the gas cooler (1) to which the heat exchanger according to the present invention is applied is 2, and the second header tank (3 The number of header sections (33) of 1) is 1 and the number of paths (P1) (P2) is 2, but the number of header sections of the first header tank (2) is not limited to this. Is 3 or more, the number of header sections of the second header tank (3) is one less than the number of header sections of the first header tank (2), and the number of passes is the header of the first header tank (2). It may be the same as the number of parts. In the heat exchanger according to the present invention, the first header tank is provided with a plurality of header portions arranged in the length direction, and the second header tank has the same number of header portions as the header portions of the first header tank. Provided side by side in the length direction, a refrigerant inlet is provided at a header portion at one end in the length direction of the first header tank, and at a header portion at the end opposite to the refrigerant inlet in the second header tank. A refrigerant outlet is provided, and all the heat exchange pipes (4) are composed of a plurality of heat exchange pipes (4) arranged continuously in the length direction of the header tank and are one more than the number of headers of both header tanks. It may also apply to gas coolers that are divided into several passes.

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

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

  Furthermore, in the said embodiment, although the heat exchanger by this invention is applied to the gas cooler of a supercritical refrigeration cycle, the heat exchanger by this invention may be applied to the evaporator of a supercritical refrigeration cycle.

  10 and 11 show a modification of the header tank.

  10 and 11, the thickness of the outer portion (41b) of the tank main body (41) of the header tank (40) is the same as that of the outer portion (7) of the tank main body (7) shown in FIGS. It is thinner than the thickness of 7b). The thickness of the inner portion (41a) of the tank body (41) and the cross-sectional shape of the left surface are the same as those of the inner portion (7b) of the tank body (7) shown in FIGS. 3 and 4 of the embodiment described above. It is. The right surface (outer surface) of the tank body (41) is formed of an aluminum brazing sheet having a brazing material layer on both surfaces, and is covered with a plate (42) brazed to the tank body (7). The engaging claw (32) of each side surface covering wall (31) of the pipe connecting plate (8) engages with the right surface of the plate (42) and is brazed to the plate (42).

  The right end of the communication hole (12) of the tank body (42) opens to the right side of the tank body (7), and the hole that combines the pipe insertion hole (11) and the communication hole (12) connected to this is penetrated. It has become a shape. The right end opening of the communication hole (12) is closed by the plate (42).

  In the case of this modified header tank (40), it is possible to braze other parts such as an inlet member and an outlet member using the brazing material layer of the reinforcing plate.

  Other configurations are the same as the header tanks (2) and (3) of the above-described embodiment.

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 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 a partially enlarged view of FIG. 2. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. In manufacturing the gas cooler of FIG. 1, it is a disassembled perspective view which shows the tank main body, the pipe connection plate, the inlet member, and the outlet member which comprise a 1st header tank. In manufacturing the gas cooler of FIG. 1, it is a disassembled perspective view which shows the tank main body and pipe connection plate which comprise a 2nd header tank. It is a figure equivalent to FIG. 3 which shows the modification of a header tank. It is a figure equivalent to FIG. 4 which shows the modification of a header tank.

Explanation of symbols

(1): Gas cooler (heat exchanger)
(2): First header tank
(3): Second header tank
(4): Heat exchange pipe
(7): Tank body
(7a): Inside part
(8): Pipe connection plate
(9): Fluid passage
(11): Tube insertion hole
(12): Communication hole
(15): Recess
(19): Pipe insertion through hole
(21): Bent part
(31): Side cover
(32): engaging claw
(42): Plate

Claims (9)

A pair of header tanks arranged in the width direction in the ventilation direction and spaced apart from each other, and arranged between the header tanks in the length direction of the header tank, and both ends are respectively connected to the header tank. A plurality of joined heat exchange pipes, and at least one of the header tanks covers a tank body having a plurality of fluid passages and a surface facing the inside of the tank body and is joined to the tank body. It is composed of an aluminum brazing sheet pipe connection plate, and a plurality of pipe insertion holes into which the end of the heat exchange pipe is inserted from the inner surface of the tank main body to the inner and outer direction and the pipe insertion. A plurality of communication holes that extend to the outside of the hole and allow adjacent fluid passages to pass through are formed at intervals in the length direction of the header tank. The partition wall between adjacent fluid passages is cut off at the part where the through hole is formed, and the pipe connecting plate has a plurality of through holes for pipe insertion leading to the pipe insertion hole of the tank body in the length direction of the header tank. Formed at intervals, the heat exchange pipe is passed through the pipe insertion through hole of the pipe connection plate and joined to the pipe connection plate and the tank main body in a state of being inserted into the pipe insertion hole of the tank main body. In the heat exchanger,
The tank body is made of an extruded aluminum material in which a plurality of fluid passages are formed side by side in the width direction, and the thickness of the inner part of the tank body from the fluid passage is the thickest at the center in the width direction, and both side edges Heat exchanger that becomes thinner toward the part. The transverse cross-sectional shape of the surface facing the inside of the tank body is an arcuate shape with the central portion in the width direction protruding inward, and the inner ends of all the fluid passages are located in the same plane. Heat exchanger. The pipe insertion hole and communication hole of the tank body are longer in the width direction of the header tank, and the length of the communication hole is shorter than the length of the pipe insertion hole. The heat exchanger according to claim 1 or 2, wherein stepped portions are formed between both ends. The pipe insertion holes and communication holes in the tank main body, and the pipe insertion through holes in the pipe connection plate are elongated in the header tank width direction, and both side portions extend in the length direction of the pipe insertion hole on the inner surface of the tank main body. A recess is formed on the side of the pipe connection plate that faces the tank body, and protrudes toward the tank body on both side edges extending in the length direction of the through hole for pipe insertion. The heat exchanger according to any one of claims 1 to 3, wherein a bent portion is formed. A pipe connecting plate is provided on the side surface covering portion that covers both side surfaces of the tank body, and on the tip of the side surface covering portion, and is engaged with the side edge portion of the surface opposite to the heat exchange tube side in the tank body. The heat exchanger in any one of Claims 1-4 which have a joint part. The outer surface of the tank body is covered with a plate made of an aluminum brazing sheet having at least a brazing filler metal layer on the outer surface side, and the plate is joined to the tank body. Heat exchanger. The heat exchanger according to claim 6, wherein an outer end of the communication hole is open to an outer surface of the tank body, and the tube insertion hole and the communication hole connected to the tube insertion hole are formed in a penetrating shape. The heat exchanger according to claim 6 or 7, wherein other parts are brazed to the outer surface of the plate using a brazing material layer of the plate. The pipe connecting plate has a side surface covering portion that covers both side surfaces of the tank main body, and an engaging portion that is provided at the tip of the side surface covering portion and engages with both side edges of the outer surface of the plate. A heat exchanger according to any of the above.

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