JP2008075895A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent degradation of sealing performance between a piping member and a joint member for piping connection in mounting the joint member for piping connection to a mounting face of the piping member. <P>SOLUTION: An inlet-side piping member having a refrigerant flow channel communicated with the inside of one of headers of a condenser, is brazed to the header. Similarly, an outlet-side piping member 9 having a refrigerant flow channel 9a communicated with the inside of the other header 3 is brazed to the other header 3. The outlet-side piping member 9 has an inclined face 25 inclined obliquely upward. A part excluding a side edge portion near the header 3, of the inclined face 25 is projected obliquely upward, and a projecting end face of the projecting portion 27 is directed obliquely upward, and applied as the mounting face 28 for mounting the joint member for piping connection. A groove portion 30 is formed between the projecting portion 27 of the outlet-side piping member 9 and the header 3. One end of the refrigerant flow channel 9a is opened to the mounting face 28. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger.

  In this specification, the upper and lower sides and the left and right sides in FIG.

  For example, as a heat exchanger applied to a condenser of a car air conditioner of a vehicle, a pair of headers arranged in the vertical direction with a space in the left-right direction and a pair of headers extending in the vertical direction between the headers in parallel. A plurality of flat heat exchange pipes arranged at both ends and connected to both headers, fins arranged between adjacent heat exchange pipes, brazed to one header, and the inside of the one header An inlet-side piping member having a refrigerant flow path leading to and an outlet-side piping member brazed to the one header or the other header and having a refrigerant flow path leading to the inside of the one header or the other header. Both pipe members are joined to the outer peripheral surface of the header in a surface contact state, and are formed to face the opposite side of the joint surface, and a pipe connection joint member is attached. It has a vertical shaped mounting surface for one end of the coolant channel has been known one which is open to attachment surface (see Patent Document 1).

  The heat exchanger described in Patent Document 1 is manufactured by assembling all the parts, applying a flux suspension to a necessary part, and then brazing all the parts in a furnace at once. Here, in the portion where the piping member is brazed to the header, the flux suspension is usually brush-painted across the header and the piping member so that excessive flux suspension is not applied.

By the way, in the heat exchanger of patent document 1, the attachment surface to which the joint member for pipe connection in a piping member is attached is vertical, and it is formed so that it may face the opposite side to the joint surface to a header outer peripheral surface. However, depending on the type of vehicle, for the convenience of piping, the mounting surface of the piping member is formed so as to face diagonally upward, and one side edge of the mounting surface facing diagonally upward is the joint surface to the header outer peripheral surface May be connected to one side edge. However, in this case, if the flux suspension is brushed across the header and the piping member, the flux suspension may flow to the opening side of the refrigerant flow path on the mounting surface of the piping member. As a result, after brazing, a flux residue is generated in the vicinity of the opening of the refrigerant flow path on the mounting surface of the piping member or in the refrigerant flow path, and the pipe connecting joint member is mounted on the mounting surface of the piping member. There exists a problem that the sealing performance between a member and the joint member for pipe connection falls.
JP 2006-57950 A

  An object of the present invention is to achieve the heat exchange that solves the above-described problems and can prevent deterioration of the sealing performance between the pipe member and the pipe connecting joint member when the pipe connecting joint member is attached to the pipe member mounting surface. Is to provide a vessel.

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

1) A pair of headers extending in the vertical direction spaced apart in the left-right direction, and a plurality of headers arranged in parallel with a space in the vertical direction between both headers and both ends connected to both headers. And a fin disposed between adjacent heat exchange tubes, and one header is brazed with an inlet side piping member having a refrigerant flow path leading to the inside thereof, The one header or the other header is brazed with an outlet-side piping member having a refrigerant flow path leading to the inside, and at least one of the two piping members is attached to a pipe connection joint member In the heat exchanger in which one end of the refrigerant flow path is open to the mounting surface,
The piping member having the mounting surface has an inclined surface facing obliquely upward, and at least a part of the inclined surface faces obliquely upward and is a mounting surface for attaching a joint member for pipe connection. The heat exchanger by which the groove part extended in the inclination direction of the said inclined surface is formed in the part by the side of a header rather than the end of the refrigerant flow path opened in the said attachment surface in the surface.

  2) One side edge of the inclined surface in the piping member having the inclined surface is connected to one side edge of the joint surface joined to the outer peripheral surface of the header in the piping member, except for the side edge portion near the header in the inclined surface. The projecting end surface of the projecting portion that projects obliquely upward is a mounting surface that faces obliquely upward, and a groove portion is formed between the projecting portion that projects diagonally upward of the piping member and the header. The heat exchanger according to 1), wherein is formed.

  3) The heat exchanger according to 1) or 2) above, wherein a female thread hole used for screwing the joint member for pipe connection is formed on a mounting surface facing obliquely upward of the pipe member.

  4) A refrigeration cycle that includes a compressor, a condenser, a decompressor, and an evaporator, and that uses a chlorofluorocarbon refrigerant, the condenser comprising the heat exchanger according to any one of 1) to 3) above Refrigeration cycle.

  5) A vehicle equipped with the refrigeration cycle described in 4) above as a car air conditioner.

  When the mounting surface of the piping member faces diagonally upward as in the heat exchanger of 1) above, if the flux suspension is brushed on the header and the portion to be brazed of the piping member, the mounting surface of the piping member Although the flux suspension easily flows, even in this case, a groove portion extending in the inclination direction of the inclined surface is formed in a portion of the inclined surface on the header side with respect to one end of the refrigerant flow path opened in the attachment surface. Since it is formed, the flux suspension enters the groove and is discharged through the groove. Accordingly, it is possible to prevent the flux suspension from flowing near the opening of the refrigerant flow path on the mounting surface of the piping member or the flux suspension from flowing into the refrigerant flow path. It is possible to prevent the flux residue from being generated in the vicinity of the opening of the refrigerant flow path on the mounting surface and in the refrigerant flow path. As a result, it is possible to prevent a decrease in the sealing performance between the piping member and the piping connecting joint member when the piping connecting joint member is attached to the mounting surface of the piping member.

  As in the heat exchanger of 2) above, when one side edge of the inclined surface in the pipe member having the inclined surface is connected to one side edge of the joint surface joined to the outer peripheral surface of the header in the pipe member, When the flux suspension is brushed across the header and the piping member, the flux suspension tends to flow particularly on the mounting surface of the piping member. Since the flux suspension enters the groove portion and flows through the groove portion and is discharged, the flux suspension flows in the vicinity of the opening of the refrigerant flow path on the mounting surface of the piping member, Alternatively, the flux suspension is prevented from flowing into the refrigerant flow path, and after brazing, flux residue is generated in the vicinity of the opening of the refrigerant flow path on the mounting surface of the piping member and in the refrigerant flow path. Is prevented.

  Further, according to the heat exchanger of 2) above, when the flux suspension is brush-painted on the header and the piping member to be brazed, the tip of the brush can be placed in the groove. Therefore, it becomes difficult for the flux suspension to flow out of the groove, and the flux suspension flows near the opening of the coolant channel on the mounting surface of the piping member, or the flux suspension flows into the coolant channel. Is effectively prevented.

  When the female screw hole used for screwing the joint member for pipe connection is formed on the mounting surface facing diagonally upward of the pipe member as in the heat exchanger of 3) above, the header and the pipe member If the flux suspension is brushed over the pipe, the flux suspension flows on the mounting surface of the piping member and flows into the female screw hole. After brazing, flux residue is generated in the female screw hole, and the piping member is attached. It may interfere with the screwing of the joint member for pipe connection to the surface. However, when configured as in the above 1) and 2), the flux suspension enters the groove portion and flows through the groove portion and is discharged. Therefore, the flux suspension is placed in the female screw hole on the mounting surface of the piping member. The turbid liquid is prevented from flowing in. As a result, the flux residue is prevented from being generated in the female screw hole after brazing.

  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 condenser of a car air conditioner.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. In the following description, the downstream side in the ventilation direction (the direction indicated by the arrow X in FIG. 1) flowing between adjacent heat exchange tubes is referred to as the front, and the opposite side is referred to as the rear.

  FIG. 1 shows the overall configuration of a capacitor to which a heat exchanger according to the present invention is applied, and FIGS. 2 and 3 show the configuration of the main part thereof.

  In FIG. 1, the capacitor (1) is vertically connected between a pair of aluminum headers (2) (3) and a pair of headers (2) (3) which are arranged in the vertical direction and spaced in the horizontal direction. A plurality of aluminum heat exchange tubes (4) arranged at intervals in the direction and having both ends connected to both headers (2) (3), between adjacent heat exchange tubes (4), and Aluminum corrugated fins (5) that are placed outside the heat exchange tubes (4) at the upper and lower ends and brazed to the heat exchange tubes (4), and corrugated fins that are placed outside the corrugated fins (5) at the upper and lower ends An aluminum side plate (6) brazed to the fin (5).

  The right header (2) is divided into two upper and lower header parts (2a) and (2b) by an aluminum partition member (7) above the center in the height direction, and the left header (3) is The upper and lower header parts (3a) and (3b) are partitioned by a partition member (7) below the central part. Aluminum inlet-side piping member having a fluid inlet (not shown) formed in the upper header portion (2a) of the right header (2) and having a refrigerant channel (8a) communicating with the upper header portion (2a) through the fluid inlet. (8) is brazed to the upper header part (2a). A fluid outlet (20) (see FIGS. 2 and 3) is formed in the lower header portion (3b) of the left header (3), and the refrigerant flow path leads into the lower header portion (3b) via the fluid outlet (20). An aluminum outlet side piping member (9) having (9a) is brazed to the lower header portion (3b).

  Both headers (2) and (3) are brazed pipes in which a base plate made of an aluminum brazing sheet having a brazing material layer on both sides is formed into a cylindrical shape, and both side edges are partially overlapped and brazed to each other A cylindrical header body (10), and an aluminum closing member (11) that is brazed to both ends of the header body (10) and closes the openings at both ends. The header body (10) may be an extruded pipe having a brazing filler metal layer on the outer peripheral surface instead of the brazed pipe.

  As shown in FIG. 3, the heat exchange tube (4) is made of an aluminum brazing sheet having a brazing filler metal layer on both sides, and connects two flat wall forming portions, both flat wall forming portions, and one side wall. The connecting portion to be formed, the protruding protrusion for the side wall which is integrally formed in a raised shape above the side edge opposite to the connecting portion in both flat wall forming portions, and the other side wall is formed integrally with the flat wall forming portion. A metal plate provided with a plurality of ridges for reinforcing walls is brazed by bending the side wall ridges and the reinforcing wall ridges by bending them into a hairpin shape on both sides of the connecting portion. It is. The heat exchange pipe (4) is inserted into the pipe insertion holes (12) of both headers (2) and (3) and brazed to both headers (2) and (3). The heat exchange pipe (4) may be made of an aluminum extruded profile in which a plurality of fluid passages are formed in parallel.

  The inlet side piping member (8) has a rectangular parallelepiped shape made of an aluminum bare material, and is brazed so as to protrude rightward on the outer peripheral surface of the upper header portion (2a) of the right header (2). The rear surface of the inlet-side piping member (8) is vertical, and a portion of the rear surface of the inlet-side piping member (8) excluding the left edge protrudes backward. The rear surface of the rear protruding portion (21) of the inlet side piping member (8) is a vertical mounting surface (22) for mounting a pipe connecting joint member (not shown), and the refrigerant flow path (8a) One end of each is open to the attachment surface (22). A bottomed female screw hole (23) is formed in a portion of the mounting surface (22) of the inlet side piping member (8) above the one end opening of the refrigerant flow path (8a). (23), the joint member for pipe connection attached to the tip of the inlet side pipe (not shown) is screwed to the mounting surface (22) of the inlet side pipe member (8). Yes. Further, a vertical groove portion (24) extending in the vertical direction is formed between the rearward projecting portion (21) of the inlet side piping member (8) and the right header (2).

  The outlet side piping member (9) has a rectangular parallelepiped shape made of an aluminum bare material, and is brazed so as to protrude to the left on the outer peripheral surface of the lower header portion (3b) of the left header (3). As shown in FIG. 2 and FIG. 3, the rear surface of the outlet side piping member (9) is an inclined surface (25) facing obliquely upward rearward so that the upper end portion is inclined forward. The right edge of the inclined surface (25) in the outlet pipe member (9) is the rear edge of the joint surface (26) joined in close contact with the outer peripheral surface of the left header (3) in the outlet pipe member (9). It is lined up. In addition, a portion of the inclined surface (25) of the outlet side piping member (9) excluding the right edge near the left header (3) protrudes obliquely upward, and the obliquely upward protruding portion (27) The rear surface (protruding end surface) is a mounting surface (28) that faces diagonally upward after the fitting member for pipe connection (not shown) is attached, and one end of the refrigerant flow path (9a) opens to the mounting surface (28). is doing. The other end of the refrigerant channel (9a) is formed in the joint surface (26) so as to communicate with the refrigerant outlet (20). A bottomed female screw hole (29) is formed in a portion of the mounting surface (28) of the outlet side piping member (9) above the one end opening of the refrigerant flow path (9a). (29), the joint member for pipe connection attached to the tip of the outlet side pipe (not shown) is screwed to the mounting surface (28) of the outlet side pipe member (9) Yes. Further, a groove portion (30) extending in the inclination direction of the mounting surface (28) is formed between the protruding portion (27) of the outlet side piping member (9) and the left side header (3).

  The capacitor (1) is manufactured by assembling and temporarily fixing all the parts, then applying a flux suspension to a necessary portion, and then brazing all the parts in a furnace at once. Here, in the case of the outlet side piping member (9), the flux suspension is straddled across the outer peripheral surface of the left header (3) and the right edge of the inclined surface (25) of the outlet piping member (9). Paint with a brush. At this time, the brush tip can be applied so that the tip of the brush enters the groove (30), so that the flux suspension is less likely to flow out of the groove (30), and the outlet side piping member (9) is attached. The flux suspension flows near the opening of the refrigerant flow path (8a) on the surface (28), or the flux suspension flows into the refrigerant flow path (8a) and the female screw hole (29). As a result, after brazing, after the brazing, in the vicinity of the opening of the refrigerant flow path (8a) in the mounting surface (28) of the outlet side piping member (9), and in and around the refrigerant flow path (8a). Generation of flux residue in the screw hole (29) is prevented. Therefore, the deterioration of the sealing performance between the outlet side pipe member (9) and the pipe connection joint member when the pipe connection joint member is attached to the mounting surface (28) of the outlet side pipe member (9) is prevented. be able to.

  In the case of the inlet side piping member (8), the flux suspension is brush-painted across the outer peripheral surface of the right header (2) and the left edge of the rear surface of the inlet piping member (8). At this time, since the brush can be applied with the tip of the brush entering the groove (24), the flux suspension is less likely to flow out of the groove (24). Even if the groove (24) is not formed, the attachment surface (22) of the inlet-side piping member (8) is vertical, so the flux suspension easily flows downward, and the refrigerant flow It becomes difficult to flow to the opening side of the path (8a).

  The condenser (1) constitutes a refrigeration cycle that uses a chlorofluorocarbon refrigerant together with, for example, a compressor, a decompressor, and an evaporator. This refrigeration cycle is mounted on a vehicle as a car air conditioner.

  In the above embodiment, the mounting surface (22) of the inlet side piping member (8) is vertical, but instead of this, the upper surface is inclined obliquely like the mounting surface (28) of the outlet side piping member (9). May be suitable.

  Further, in the above embodiment, the inlet side piping member (8) and the outlet side piping member (9) each have a mounting surface to which the pipe connecting joint member is attached. However, the present invention is not limited to this. Only one of the piping members may have a mounting surface to which the pipe connecting joint member is attached. In this case, the mounting surface faces rearward and obliquely upward. In this case, as a piping member having no mounting surface, for example, a union joint-shaped member is used.

  Further, in the above embodiment, since both headers (2) (3) are partitioned into the same number of header portions (2a) (2b) (3a) (3b), the right side header (2) is connected to the inlet side piping member. (8) is brazed and the outlet side piping member (9) is brazed to the left header (3), but is not limited to this, one header is partitioned into a plurality of header parts, The other header may have one less header portion. In this case, both the inlet side and outlet side piping members (8) and (9) are brazed to the one header.

Further, in the above embodiment, the heat exchanger according to the present invention is applied to a condenser of a refrigeration cycle using a chlorofluorocarbon refrigerant, but is not limited to this, and other heat exchangers such as chlorofluorocarbons are used. The present invention can also be applied to an evaporator of a refrigeration cycle using a system refrigerant, a gas cooler and an evaporator of a supercritical refrigeration cycle using a supercritical refrigerant such as CO ₂ .

1 is an overall perspective view showing an embodiment of a capacitor to which a heat exchanger according to the present invention is applied. It is a partial expanded horizontal sectional view in the lower header part of the right header of FIG. It is a partial expansion disassembled perspective view which shows the part of an outlet side piping member.

Explanation of symbols

(1): Capacitor (heat exchanger)
(2) (3): Header
(4): Heat exchange pipe
(5): Corrugated fin
(8): Inlet side piping member
(8a): Refrigerant flow path
(9): Outlet piping member
(9a): Refrigerant flow path
(22): Mounting surface
(25): Inclined surface
(26): Joint surface
(27): Projection
(28): Mounting surface
(29): Female thread hole
(30): Groove

Claims (5)

A pair of headers extending in the vertical direction spaced apart in the left-right direction, and a plurality of flats arranged in parallel with a space in the vertical direction between the headers and having both ends connected to both headers. And a fin disposed between adjacent heat exchange tubes, and an inlet side piping member having a refrigerant flow path leading to the inside thereof is brazed to one of the headers. An outlet-side piping member having a refrigerant flow path leading to the header is brazed to the other header or the other header, and at least one of the two piping members has a mounting surface for attaching a joint member for pipe connection. In the heat exchanger in which one end of the refrigerant flow path is open to the mounting surface,
The piping member having the mounting surface has an inclined surface facing obliquely upward, and at least a part of the inclined surface faces obliquely upward and is a mounting surface for attaching a joint member for pipe connection. The heat exchanger by which the groove part extended in the inclination direction of the said inclined surface is formed in the part by the side of a header rather than the end of the refrigerant flow path opened in the said attachment surface in the surface. The one side edge of the inclined surface in the piping member having the inclined surface is connected to one side edge of the joint surface joined to the outer peripheral surface of the header in the piping member, and the portion excluding the side edge portion near the header in the inclined surface Projecting obliquely upward, and the projecting end surface of the obliquely projecting portion is a mounting surface facing obliquely upward, and a groove is formed between the projecting portion of the piping member obliquely upward and the header. The heat exchanger according to claim 1. The heat exchanger according to claim 1 or 2, wherein a female thread hole used for screwing the joint member for pipe connection is formed on an attachment surface facing obliquely upward of the pipe member. A refrigeration cycle comprising a compressor, a condenser, a decompressor and an evaporator and using a chlorofluorocarbon refrigerant, wherein the condenser comprises the heat exchanger according to any one of claims 1 to 3. A vehicle in which the refrigeration cycle according to claim 4 is mounted as a car air conditioner.

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