JP2003083698A - Heat exchanger and its production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a heat exchanger, in which a core part is brazed, and a heat-treatment unallowable member, such as desiccant and the like is inserted in a specified part in a header part pipe, etc., and the end of the specified part is positively closed with a cover. SOLUTION: The core parts are integrally brazed in a furnace. The heat- treatment unallowable member is inserted in the specified part of the header pipe, etc. In that case, after the core parts are brazed integrally, the heat- treatment unallowable member is inserted in the specified part, and the insertion- side end is closed with a cover, and subjected to a plastic deformation in order to prevent the cover from coming off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a core portion is integrally brazed in a furnace, in which a heat-treatable member such as a desiccant is inserted into a specific portion such as a header pipe. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger in which a receiver is arranged in parallel in a header pipe is well known. Such a heat exchanger is usually manufactured by brazing the core part together in a furnace and then inserting a non-heat-treatable member such as a desiccant into the liquid receiver. Therefore, at least one end of the liquid receiver, that is, the end on the side where the desiccant is inserted, must be fixed and closed by a method that does not involve heat treatment such as brazing.

For example, as shown in FIG.
A cylindrical flange 76 having a thread groove 77 formed on the inner periphery of the desiccant insertion side end thereof is previously joined by brazing or the like, and a desiccant (not shown) is inserted, and then a screw thread 79 is provided. A method of screwing the lid 78 to close the end portion has been adopted.

[0004]

However, in the method of fixing the lid body as described above, it is necessary to engrave the thread groove 77 on the flange 76, but the manufacturing cost is complicated because the processing of the thread groove 77 is complicated. May rise. Furthermore, although the application has not yet been published, the applicant of the present invention has previously proposed a heat exchanger integrated with a receiver in which a desiccant is contained in a header pipe. However, if the fixing structure of the lid is applied to the above proposal as it is, the following problems may occur. That is, the lid 78 is attached to the end portion of the header pipe, which has a higher internal pressure than the receiver, on the desiccant insertion side.
To securely fix the
Must be lengthened in the axial direction of the flange 76. Therefore, the flange 76 may be increased in size in the axial direction. Increasing the size of the flange 76 not only increases the cost but also increases the size of the heat exchanger.

An object of the present invention is to secure a lid at the end of the insertion side of a specific portion such as a header pipe into which a non-heat-treatable member such as a desiccant is inserted while preventing an increase in size of the apparatus and an increase in manufacturing cost. It is to provide a heat exchanger that can be fixed to the heat exchanger and a manufacturing method thereof.

[0006]

In order to solve the above-mentioned problems, in the method for manufacturing a heat exchanger of the present invention, the core part is integrally brazed in the furnace, and the core part is dried in a specific portion such as a header pipe. When manufacturing a heat exchanger in which a non-heat-treatable member such as an agent is inserted, after integrally brazing the core part,
Inserting the non-heat-treatable member into a specific site, closing the insertion-side end of the non-heat-treatable member at the specific site with a lid, and plastically deforming the insertion-side end to prevent the lid from coming off. The method is characterized by.

A sealant is attached to the lid (for example,
It is preferable to use a lid body (with an O-ring). If the lid with the sealing material is used, the airtightness of the end portion of the header pipe on the desiccant insertion side can be ensured.

It is also possible to inject solder into the tip of the plastically deformable portion to form a fusible plug. For example, if the tip is spun and solder is injected to form a fusible plug, if the inside of the header pipe becomes hot for some reason, the solder melts and the safety of the device can be ensured.

Examples of the plastic deformation processing include drawing processing. For example, if a groove is formed in the circumferential direction of the lid body, the lid body is inserted into the end portion of the header pipe, and then the portion corresponding to the groove portion on the side surface of the header pipe is drawn, the lid body can be easily fixed. You can

According to the heat exchanger manufacturing method as described above, the lid can be securely fixed to the desiccant insertion side end of the header pipe into which the desiccant is inserted. It is possible to realize a heat exchanger that can prevent the cost and achieve cost reduction.

In the above heat exchanger manufacturing method, after the core portion of the heat exchanger is integrally brazed,
The non-heat-treatable member is inserted from the insertion-side end of the non-heat-treatable member of the specific portion, and the lid is further inserted into the insertion-side end. Then, in this state, the end portion on the insertion side is plastically deformed to prevent the lid body from coming off, that is, to a shape that prevents the lid body from coming off. That is, a stress reaching the yield value is applied to the insertion side end, and the insertion side end is permanently deformed into a shape that prevents the lid body from coming off. Therefore, since the lid body of the insertion side end can be firmly and securely fixed by a simple method of plastically deforming the insertion side end after inserting the lid body into the insertion side end portion, the size and cost of the device are increased. Can be prevented.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the heat exchanger and the method for manufacturing the heat exchanger of the present invention will be described below with reference to the drawings. 1 and 2 show a heat exchanger manufactured by the method for manufacturing a heat exchanger according to the first embodiment of the present invention. In the figure, 1 has shown the heat exchanger.
The heat exchanger 1 has two header pipes 2 and 3.
A plurality of heat exchange tubes 4 are arranged in parallel between the header pipes 2 and 3, and the insides of the header pipes 2 and 3 are in communication with each other. Corrugated fins 5 are arranged between the plurality of heat exchange tubes 4.

An inlet pipe 6 and an outlet pipe 7 for a heat exchange medium (for example, a refrigerant) are joined to the header pipe 2. A desiccant 8 is inserted in the header pipe 2. The desiccant 8 is housed in a frame (not shown). The desiccant 8 is inserted into the header pipe 2 from the desiccant insertion side end portion 9 of the header pipe 2. The desiccant insertion side end portion 9 is closed by a lid body 10, and the lid body 10 is provided with an O-ring 11 as a sealing material. The lid 10 has a plastic deformation portion 1 provided at the desiccant insertion side end 9 so as to prevent the lid 10 from coming off.
It is fixed at a predetermined position by 2.

The end portion 13 of the header pipe 2 on the anti-desiccant insertion side
Is closed by a lid body 14, and both ends of the header pipe 3 are closed by lid bodies 15, 16. Lids 14, 15, 1
6 is brazed to the header pipe.

The heat exchanger 1 according to this embodiment is manufactured as follows. First, header pipes 2, 3,
Each member of the tube 4 and the fin 5 is temporarily assembled. In this state, the lid 1 is attached to both ends of the header pipe 3.
5 and 16 are inserted, the lid 14 is inserted into the end portion 13 on the anti-desiccant insertion side of the header pipe 2, but the end portion 9 on the desiccant insertion side is left open. Further, the desiccant 8 and the like are not inserted into the header pipe 2 because they may be denatured by heat. The core portion 17 temporarily assembled in this manner is brazed together in the furnace.

Next, the desiccant 8 is inserted from the desiccant insertion side end portion 9 of the header pipe 2. Then, the lid 10 is inserted into the desiccant insertion side end portion 9 from the direction of the white arrow (FIG. 2).
(A)). Then, the tip end portion 18 of the desiccant insertion side end portion 9 of the header pipe 3 is plastically deformed so as to prevent the lid body 10 from coming off, and a plastically deformed portion 12 is formed (FIG. 2B). In the present embodiment, the tip end portion 18 is radially inwardly applied to the lid body 10 to apply a stress beyond the yield point to permanently deform the lid body 10 to form the plastically deformable portion 12 and move the lid body 10 in the axial direction. Are regulated so that they cannot be pulled out. Since the O-ring 11 is interposed between the lid 10 and the inner wall of the header pipe 3, the airtightness of the desiccant insertion side end 9 is ensured.

FIG. 3 shows the desiccant insertion side end of the header pipe manufactured by the heat exchanger manufacturing method according to the second embodiment of the present invention. In this embodiment, the desiccant insertion side end 21 of the header pipe 20 is provided with a plurality of plastically deformable claws 22. Further, the desiccant insertion side end portion 21 of the header pipe 20 is provided with an engagement portion 24 that engages with the peripheral edge of the lid body 23 and regulates the insertion margin of the lid body 23 into the header pipe 20. The lid 23 is provided with an O-ring 25 as a sealing material.

In the present embodiment, the header pipe 20
After the desiccant (not shown) is inserted from the desiccant insertion side end 21 of the above, the lid 23 is inserted (FIG. 3A), the lid 23 is engaged with the engaging portion 24, and the claw portion is further inserted. 22 is bent and plastically deformed (FIG. 3B). Therefore, the claw portion 22 and the engaging portion 24 regulate the movement of the lid body 23 in the axial direction of the header pipe 20, so that the lid body 23 is reliably prevented from coming off. The O-ring 25 maintains the airtightness between the inner wall of the header pipe 20 and the side portion of the lid 25.

FIG. 4 shows the desiccant insertion side end of the header pipe manufactured by the method for manufacturing a heat exchanger according to the third embodiment of the present invention. In this embodiment, the desiccant insertion side end portion 27 of the header pipe 26 is drawn, and a drawn portion 28 is formed at the tip. That is, as shown in FIG. 4, a lid 30 having a desiccant (not shown) and an O-ring 29 is inserted from the end 27 of the desiccant insertion side of the header pipe 26 in the direction of the white arrow (see FIG. 4).
(A)) Further, the tip end portion 31 of the end portion 27 is subjected to a drawing process to be plastically deformed, so that the lid body 30 is firmly fixed at a predetermined position and the dropout is reliably prevented ( FIG. 4B).

FIG. 5 shows a desiccant insertion side end of a header pipe manufactured by the method for manufacturing a heat exchanger according to the fourth embodiment of the present invention. In this embodiment, the desiccant insertion side end portion 33 of the header pipe 32 is provided with the throttle portion 34 as in the third embodiment. Further, solder 35 is injected at the tip of the narrowed portion 34. In FIG. 5, first, the desiccant 36 is inserted from the desiccant insertion side end portion 33 of the header pipe 32, and the lid 37 is inserted (FIG. 5A). Next, the tip portion 38 of the end portion 33
Is subjected to a drawing process to be plastically deformed to form a drawn part 34, and the solder 35 is injected into the tip of the drawn part 34.

In the present embodiment as well, by drawing the desiccant insertion side end portion 33, the movement of the lid body 37 in the axial direction of the header pipe 32 is restricted, and the lid body 37 is reliably prevented from coming off. It has become so. Further, in this embodiment, the fusible plug is formed by injecting the solder 35 into the tip of the narrowed portion 34. Therefore, when the inside of the header pipe 32 is heated to a high temperature, the solder 35 is melted to prevent an excessive rise in the internal pressure and ensure the safety of the device.

FIG. 6 shows the desiccant insertion side end of the header pipe manufactured by the method for manufacturing a heat exchanger according to the fifth embodiment of the present invention. In this embodiment, the lid 4 inserted into the desiccant insertion side end portion 40 of the header pipe 39.
1 is provided with a groove portion 42 and an O-ring 43 extending in the circumferential direction. In FIG. 6, first, the desiccant insertion side end portion 4
A desiccant (not shown) is inserted from 0, and the lid 41 is further inserted (FIG. 6A). Next, a drawing process is performed on a side surface of the header pipe 39 at a position corresponding to the groove 42 of the lid 41 to form a drawing part 44 (FIG. 6B). Since the meat of the header pipe 39 is sandwiched between the groove portions 42 by forming the narrowed portion 44 in this manner, the header pipe 3 of the lid body 41 is formed.
The movement of 9 in the axial direction is restricted so that the lid 41 is securely prevented from coming off. In the present embodiment, it is preferable that the narrowed portion 44 is provided with the band 45 and the narrowed portion 44 is tightened. If the band 45 is provided, the narrowed portion 44 is deformed with time, for example, and the groove portion 41 is formed.
Since it is possible to surely prevent the inconvenience of coming off, the fixing structure of the lid body 41 can be made stronger, and the lid body 41 can be more reliably prevented from coming off.

[0023]

As described above, according to the method of manufacturing the heat exchanger of the present invention, the heat treatment non-member such as the desiccant is headered after the brazing of the core portion while preventing the size and cost of the apparatus from increasing. The lid can be inserted into a specific portion such as a pipe and the end portion of the specific portion can be securely fixed and closed.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat exchanger manufactured by a method for manufacturing a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a process diagram for fixing the lid to the desiccant insertion side end of the header pipe of the heat exchanger of FIG.

FIG. 3 is a process diagram for fixing the lid to the desiccant insertion side end of the header pipe of the heat exchanger manufactured by the heat exchanger manufacturing method according to the second embodiment of the present invention.

FIG. 4 is a process diagram for fixing the lid to the desiccant insertion side end of the header pipe of the heat exchanger manufactured by the heat exchanger manufacturing method according to the third embodiment of the present invention.

FIG. 5 is a process diagram for fixing the lid to the desiccant insertion side end of the header pipe of the heat exchanger manufactured by the method for manufacturing a heat exchanger according to the fourth embodiment of the present invention.

FIG. 6 is a process diagram for fixing the lid to the desiccant insertion side end of the header pipe of the heat exchanger manufactured by the heat exchanger manufacturing method according to the fifth embodiment of the present invention.

FIG. 7 is an exploded cross-sectional view of a desiccant insertion side end of a liquid receiver of a conventional heat exchanger.

[Explanation of symbols]

1 Heat Exchanger 2, 3, 20, 26, 32, 39 Header Pipe 4 Heat Exchange Tube 5 Fin 6 Inlet Pipe 7 Outlet Pipe 8, 36 Desiccant 9, 21, 27, 33, 40 Desiccant Insert Side 10 , 14, 15, 16, 23, 30, 37, 41 Lid 11, 25, 29, 43 O-ring 12 Plastic deformation part 13 Anti-desiccant insertion side end part 17 Core part 18, 31, 38 Tip part 22 Claw part 24 engaging parts 28, 34, 44 throttle part 35 solder 42 groove part 45 band

Continued front page    (72) Inventor Hirotaka Kado             20, Kotobukicho, Isesaki-shi, Gunma Sanden shares             In the company (72) Inventor Kenichi Wada             20, Kotobukicho, Isesaki-shi, Gunma Sanden shares             In the company F-term (reference) 3L065 CA03 CA17

Claims (5)

[Claims] 1. When manufacturing a heat exchanger in which a core part is integrally brazed in a furnace and a non-heat-treatable member such as a desiccant is inserted into a specific portion such as a header pipe, the core part is integrated. After brazing, the non-heat-treatable member is inserted into a specific site, the insertion side end of the non-heat-treatable member of the specific site is closed by a lid, and the insertion side end is prevented from coming off the lid. A method for manufacturing a heat exchanger, characterized in that it is plastically deformed. 2. The method for manufacturing a heat exchanger according to claim 1, wherein a lid with a sealing material is used as the lid. 3. The method for manufacturing a heat exchanger according to claim 1, wherein solder is injected into the tip of the plastically deformable portion to form a fusible plug. 4. The method for manufacturing a heat exchanger according to claim 1, wherein the plastic deformation is drawing. 5. A heat exchanger manufactured by the method for manufacturing a heat exchanger according to claim 1.