WO2000029794A1 - Heat-exchanger equipped with connector and method of connecting connector of the heat-exchanger - Google Patents

Abstract

A heat-exchanger including tubes (2, 2) for effecting heat-exchange of a medium, header pipes (3, 3) for distributing and gathering the heat medium, and provided at a header pipe with a connector (4) for connecting outside flow passages for the passage of the medium, wherein the connector (4) includes a flow passage hole (41) for allowing the medium to flow therethrough, a screw component fitting hole (42) for screwing or receiving a screw component for connecting the outside flow passage and a protuberance portion (43) to be welded at the distal end thereof to the outer periphery of the header pipe (3), and the flow passage hole (41) includes a tubular end portion (41a) to be welded to a hole portion (3a) formed in the header pipe (3). A method of connecting a connector of a heat-exchanger comprising assembling the tubes (2, 2), the header pipes (3, 3) and other connectors (5, 6), integrally brazing the resulting assembly and then welding the assembly.

Description

 Akira Itoda Publishing Heat exchanger equipped with connectors and method of connecting connectors to heat exchangers

 The present invention relates to a heat exchanger provided with a connector for connecting an external flow path for medium distribution to a header pipe, and a method for connecting a connector to the heat exchanger. Background art

 Generally, a parallel flow type heat exchanger consists of alternately stacking tubes that perform heat exchange of media and fins that promote heat exchange of media, and distributes media to both ends of these tubes. And a collection of header pipes.

 Each header pipe has upper and lower end openings closed by caps, and the inside is partitioned by a partition plate.Connectors for connecting external flow paths for medium flow are provided at key points. Is provided. According to this configuration, the medium is introduced into the heat exchanger through a predetermined connector, and exchanges heat with the outside air in the tube while reciprocating through each header pipe a plurality of times. Is discharged.

 In addition, such a heat exchanger is usually assembled by assembling the members constituting the heat exchanger, such as a tube, a fin, a header pipe, a cap, a partition plate, and a connector. Manufactured by soldering. That is, each of these members is made of a metal material in which a filler material is clad on the surface, and is assembled together using a jig or the like, and is also sent into the furnace and subjected to heat treatment. It is applied and brazed together.

Also, when applying the flux for brazing, after assembling the components, spray the spray suspension containing the flux. And is done by

 In recent years, in particular, by using belt conveyors and other transport means, the production line for applying and brazing the flux has been automated to respond to mass production of heat exchangers. .

 Some connectors are configured to connect a receiver tank to the header pipe. The receiver tank temporarily stores the medium (refrigerant) aggregated in the heat exchanger (in this case, the condenser).

 At this point, the connector of the heat exchanger needs to prevent the lump of the filter medium and the flux from adhering to the joint surface with the external flow path. This is because if the joint surface of the connector is contaminated with the filler metal flux, the airtightness between the connector and the external flow path is impaired, which may cause a medium leak.

 However, as described above, when the assembly is brazed together in the furnace, the filler material and the flux may flow into the joint surface of the connector, and the joint surface of the connector becomes dirty. There was a case.

 In particular, in the case of a heat exchanger provided with a plurality of connectors each having a different supporting direction, there are some connectors in which the joining surface must be arranged sideways or downward when brazing the assembled body. It was noticeable that the mating surface of the connector was contaminated by the material flux that drips.

 In other words, when brazing an assembled body in which a plurality of connectors were assembled, it was extremely difficult to maintain the joint surfaces of all the connectors so as not to be soiled.

On the other hand, when the connector is welded by a torch brazing etc. separately from the assembled body, the joint surface of the connector can be maintained so as not to be stained as compared with the case of heat treatment in a furnace. However, there was an inconvenience that the heat treatment required for welding was troublesome. In view of the above problems, the present invention provides a heat exchanger and a connector connecting method of the heat exchanger, which can efficiently provide a connector for connecting an external flow path for media distribution. It is an object. Disclosure of the invention

 The invention described in claim 1 of the present application includes: a tube for performing heat exchange of a medium; and a header pipe for distributing and collecting the medium, wherein the header pipe has an external flow path for medium distribution. In a heat exchanger provided with a connector to be connected, the connector includes: a flow hole through which the medium flows; a screw component mounting hole into which the external flow channel connection screw component is screwed or inserted; And a convex portion for welding to the outer periphery of the header pipe, and the flow hole has a tubular end portion to be welded to a hole provided in the header pipe.

 According to such a heat exchanger of the present invention, the connector has the flow hole through which the medium flows, the screw component mounting hole, and the projection for welding the tip to the outer periphery of the header pipe. Since the flow hole has a tubular end portion to be welded to the hole provided in the header pipe, the welding area between the header pipe and the connector can be reduced, and the connector can be efficiently provided. Can be

 In particular, when the connector is welded by torch brazing, etc., the joint surface of the connector can be maintained so as not to be stained compared to the case of heating in the furnace, but the heat treatment accompanying welding is There was an inconvenience that it took time. However, according to the present invention, since the connector is supported with a small welding area, such labor is reduced.

The invention described in claim 2 of the present application is the invention according to claim 1, wherein the header pipe has a circular tubular shape, and the connector has a convex portion. The tip is a heat exchanger that is a curved surface that fits around the outer periphery of the header pipe.

 As described above, according to the heat exchanger of the present invention, since the header pipe has a tubular shape and the distal end of the convex portion of the connector is a curved surface that fits on the outer periphery of the header pipe, the header pipe The position of the connector can be easily determined by abutting the outer periphery of the connector with the tip of the convex portion of the connector. In addition, since the welding is performed three-dimensionally, the supporting strength of the connector is improved.

 The invention described in claim 3 of the present application includes a tube for performing heat exchange of a medium, and a header pipe for distributing and collecting the medium, wherein the header pipe has an external flow path for medium distribution. In a method of connecting a connector of a heat exchanger including a plurality of connectors to be connected, at least one of the plurality of connectors, the tube and the header pipe are assembled, and the assembled body is assembled. This is a method of connecting a heat exchanger having a configuration in which a heat exchanger is heated in a furnace and brazed together, and then another of the plurality of connectors is welded to the header pipe.

 As described above, according to the heat exchanger connector connecting method of the present invention, at least one of the connectors, the tube and the header pipe are assembled, and the assembled body is heated in a furnace. After brazing together, the other of the plurality of connectors is welded to the header pipe, so that the plurality of connectors are efficiently provided.

That is, when the assembled body is brazed together in the furnace, the filler material and the flux may flow around the joint surface of the connector, and the joint surface of the connector may be soiled. However, according to the present invention, some of the plurality of connectors are welded separately from the brazing of the assembled body, so that such inconvenience is appropriately avoided. At least one connector must be brazed in the furnace. Therefore, it is not necessary to weld and braze all of the connectors.

 In particular, in conventional heat exchangers equipped with a plurality of connectors with different supporting directions, there are connectors that have to arrange the joining surface sideways or downward when brazing the assembled body. The joint surface of such a connector was conspicuously stained by the flux of the material that drips. However, according to the present invention, it is possible to separately weld while avoiding such a situation in which the joint surface is contaminated.

 In the invention described in claim 4 of the present application, the connector according to claim 3, wherein the connector to be welded to the header pipe is formed by screwing or inserting a flow hole through which the medium flows, and a screw component for connecting the external flow path. And a protrusion for welding the tip of the screw part to the outer periphery of the header pipe, and the flow hole has a tubular end for welding to a hole provided in the header pipe. This is a connector connection method for a heat exchanger having the following configuration.

 Thus, according to the method for connecting a connector of a heat exchanger of the present invention, the connector has a communication hole for circulating a medium, a screw component mounting hole, and a convex portion for welding the tip end to the outer periphery of the header pipe. In addition to the above, since the flow hole has a tubular end, the joint area between the header pipe and the connector can be reduced, and the connector can be efficiently provided.

In particular, when the connector is welded by torch brazing, etc., the joint surface of the connector can be maintained so as not to be stained compared with the case of heat treatment in the furnace, but the heat treatment accompanying the welding is performed. Was troublesome. However, according to the present invention, since the connector is supported with a small welding area, such labor is reduced. BRIEF DESCRIPTION OF THE FIGURES

 【Figure 1 】

 It is a front view showing a heat exchanger concerning a specific example of the present invention.

 【Figure 2 】

 FIG. 2 is an external view showing a header pipe and a connector according to a specific example of the present invention.

 [Figure 3]

 FIG. 2 is a side sectional view showing a header pipe and a connector according to a specific example of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

 As shown in FIG. 1, a heat exchanger 1 of the present example includes a condenser including a plurality of tubes 2 and 2 for exchanging heat of a medium, and a pair of header pipes 3 and 3 for distributing and collecting the medium. The pair of header pipes 3, 3 are provided with a plurality of connectors 4, 5, 6, respectively, for connecting external flow paths (not shown) for medium distribution. In other words, key points of each header pipe 3, 3 include a connector 4 for connecting a medium supply pipe, a connector 5 for connecting a medium discharge pipe, and a receiver tank for temporarily storing coagulated refrigerant. A connector 6 is provided to connect the medium inlet / outlet holes. These external channels and connectors 4, 5, and 6 are configured to be joined using screw parts such as bolts.

 The tubes 2, 2 are stacked with fins 7, 7 interposed therebetween, and are provided with both ends inserted into the header pipes 3, 3, respectively. In addition, side plates 8, 8 that reinforce the structural strength of the heat exchanger 1 are arranged above and below the layer consisting of the tubes 2, 2, and the fins 7, 7.

Also, each header pipe 3, 3 caps the upper and lower end openings It is a tubular tube which is closed by 31 and 31 and the inside of which is partitioned by partition plates 32 and 32 at predetermined intervals.

 According to such a configuration, the medium supplied to the inside of the heat exchanger 1 from the pipe for supplying the medium via the connector 4 passes through the tubes 2 and 2 while exchanging heat, and passes through each header pipe 3. After reciprocating several times between and, the medium is discharged from the connector 5 to the medium discharge pipe. At this time, the heat exchange of the medium is promoted by the heat radiation effect of the fins 7, 7 interposed between the tubes 2, 2 and the side blades 8, 8.

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 Also, the medium is aggregated between the time it is supplied and the time it is discharged, and is temporarily stored inside the receiver tank.

 Connect these tubes 2 and 2, header pipes 3 and 3, cabs 31 and 31, partition plates 3 2 and 3 2, and receiver tank that constitute the heat exchanger 1 of this example. The connector 6, the fins 7, 7 and the side brackets 8, 8 are each made of a metal member of a predetermined shape clad with brazing material as necessary, and are assembled using a jig. The assembled body is heat treated in a furnace to make it integral. Prior to the heat treatment in the furnace, a flux is applied to the assembled body.

 Further, in the heat treatment of the assembled body, the connector 6 for connecting the receiver tank is arranged with the joining surface of the receiver tank and the medium entrance / exit hole facing upward. That is, the joining surface is prevented from being stained with the dripping brazing material or the flux.

 Further, the connector 4 for connecting the pipe for supplying the medium and the connector 5 for connecting the pipe for discharging the medium are, as described above, after the assembled body is heated in the furnace and brazed together. The header pipe 3 is torch-fitted, that is, welded.

These connectors 4 and 5 are connectors for connecting the receiver tank. Since the supporting direction is different from that of the connector 6, if the brazing is performed together with the assembled body, the joint surface with the medium supply pipe will be horizontal or downward during the heat treatment, and the joint surface will drip. The risk of contamination by brazing filler metal and flux is relatively high. Therefore, such welding is separately performed to avoid such inconvenience.

 In the case of this example, in particular, as shown in FIGS. 2 and 3, the connector 4 for connecting the pipe for supplying the medium has a communication hole 41 for passing the medium and a screw part for connecting the external flow path. It has a screw part mounting hole 42 that is fitted or penetrated, and a convex part 43 whose tip is welded to the outer periphery of the header pipe 3.

 Further, the flow hole 41 has a tubular end 41a that is inserted into the hole 3a provided in the header pipe 3 and welded together. Further, the tip of the convex portion 43 is formed into a curved surface that fits around the outer periphery of the header pipe 3.

 Thus, according to the configuration in which the projection 43 and the outer periphery of the header pipe 3 and the end 41 a of the flow hole 41 are welded to the hole 3 a of the header pipe 3, less welding is required. The supporting strength of the connector 4 can be sufficiently secured by the area. That is, the welding area between the header pipe 3 and the connector 4 can be reduced, and the connector 4 can be provided efficiently.

 The support strength of the connector 4 is improved by the three-dimensional welding between the tip of the convex portion 43 of the connector and the outer periphery of the header tube 3.

 The connector 4 is positioned with respect to the header pipe 3 by inserting the end 41 a of the through-hole 41 into the hole 3 a of the header pipe 3 while the outer periphery of the header pipe 3 and the projection 4 3 of the connector 4 are positioned. This is done by abutting against the tip of

As described above, according to the heat exchanger of this example, the connector is O 00/29794 g having a circulation hole through which the medium flows, a screw part mounting hole into which a screw part for connecting the external flow path is screwed or inserted, and a convex part whose tip is welded to the outer periphery of the header pipe. In addition, since the flow hole has a tubular end that is welded to the hole provided in the header pipe, the welding area between the header pipe and the connector can be reduced, and the connector can be efficiently provided. It can be.

 In particular, when the connector is welded by torch brazing, etc., the joint surface of the connector can be maintained so as not to be stained compared with the case of heating in the furnace, but the heat treatment accompanying welding is troublesome. There was an inconvenience of shining. However, according to the heat exchanger of this example, since the connector is supported with a small welding area, such labor can be reduced.

 Further, according to the heat exchanger of the present example, the header pipe has a circular tubular shape, and the tip of the convex portion of the connector has a curved surface fitted to the outer circumference of the header pipe. The connector can be easily positioned by abutting the tip of the convex portion of the connector, and furthermore, the welding of the connector is performed three-dimensionally, so that the connector can be easily connected. The support strength can be improved.

 According to the heat exchanger connector connection method of this example, the tube, the header pipe, and at least one of the plurality of connectors are assembled, and the assembled body is heated in a furnace. After brazing together, the other of the plurality of connectors is welded to the header pipe, so that a plurality of connectors can be provided efficiently.

In other words, when the assembled body is brazed together in the furnace, the filler material and flux may flow around the joint surface of the connector. The joint surface of the connector may be soiled. However, according to this example, some of the plurality of connectors are welded separately from the brazing of the assembled body, so that such inconvenience can be appropriately avoided. it can. Since at least one connector is brazed in the furnace, it is not necessary to weld all of the multiple connectors.

 In particular, conventionally, in the case of a heat exchanger provided with a plurality of connectors each having a different supporting direction, there is a connector in which a joining surface must be arranged sideways or downward when brazing an assembled body. The joint surface of such a connector was conspicuously stained by the flux of the material that drips. However, according to the present invention, such a connector whose joint surface is easily contaminated can be separately welded.

 Further, according to the connector connecting method of the heat exchanger of the present embodiment, the connector to be welded to the header pipe after the assembled body is joined together is provided with a communication hole for passing the medium and a connection hole for the external flow path. And a convex part for welding the tip of the screw part to the outer periphery of the header pipe, and the flow hole is a tubular part welded to the hole provided in the header pipe. Since the end portion has no end, the welding area between the header pipe and the connector can be reduced, and the connector can be provided efficiently. Industrial applicability

 The present invention relates to a heat exchanger in which a connector can be efficiently provided and a method of connecting the connector, and the assembling property and the brazing property of the connector are improved, so that the connector can be used under severe conditions. For example, it is suitable for a heat exchanger for an automobile.

Claims

The scope of the claims 1. A tube for performing heat exchange of a medium, and a header pipe for distributing and collecting the medium, wherein the header pipe is provided with a connector for connecting an external flow path for medium distribution. In the bowl,  The connector has a flow hole for flowing the medium, a screw component mounting hole for screwing or inserting the external channel connection screw component, and a convex portion for welding a tip of the screw hole to an outer periphery of the header pipe. The heat exchanger further comprising: a tubular end portion to be welded to a hole provided in the header pipe.  2. The heat exchange according to claim 1, wherein the header pipe has a circular tubular shape, and a tip of a convex portion of the connector is a curved surface that fits over the outer periphery of the header pipe. vessel.  3. Heat exchange comprising a tube for performing heat exchange of the medium and a header pipe for distributing and collecting the medium, wherein the header pipe is provided with a plurality of connectors for connecting the external flow paths for the medium distribution. In the connector connection method of the container,  At least one of the plurality of connectors is assembled with the tube and the header pipe, and the assembled body is heat-treated in a furnace to be integrally brazed. A method for connecting a connector of a heat exchanger, characterized in that another one of the connectors is welded to the header pipe. 4. The connector to be welded to the header pipe has a circulation hole for circulating the medium, a screw component mounting hole for screwing or inserting the external channel connecting screw component, and a tip of the connector hole being outside the header pipe. The flow hole has a tubular end to be welded to a hole provided in the header pipe. 4. The method for connecting a connector of a heat exchanger according to claim 3, wherein the connector is provided.