JPH11304051A - Heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the rotation of a connecting member to an inlet and outlet piping with a simple structure in a heat-exchanger having a connecting member such as union mounted on the end part circumference of the inlet and outlet piping of the heat-exchanger by fixing the connecting member by use of the bracket of the inlet and outlet piping fixed to the core of the heat-exchanger. SOLUTION: The heat-exchanger core part of a heat-exchanger has a pair of headers 3, a plurality of tubes allowing both the headers 3 to communicate each other, and a fin 5 arranged between the tubes. An inlet (outlet) piping 6 is connected to the header 3, and a union 7 as connecting member is mounted on the end part of the piping 6, so that another piping is connectable by screwing of a cap nut. In this case, a flat locking part 8 is formed on a part of the circumference of the union 7, and a piping fixing bracket 9 consisting of an L-shaped member 10 and a member 11 is fixed to the header 3. Both the members 10, 11 are fixed to the flat locking part 8 of the union 7 by a screw 16 so as to nip it by one-side ends 12, 14 of the members 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger of, for example, a vehicle air conditioner, and more particularly to a piping connection structure of a heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as a structure of a pipe connecting portion provided with a connecting member such as a union or a flange at an end of an inlet / outlet pipe for introducing / exiting a heat exchange medium into / from a heat exchanger, for example, FIG. The following are known. In FIG. 6, reference numeral 51 denotes an end of an inlet (outlet) pipe for introducing (extracting) a heat exchange medium (for example, a refrigerant) into a heat exchanger (not shown). The pipe 51 is inserted into a hole 54 of a connection member 53 composed of a flange 52. Then, the outer periphery of the end of the pipe 51 and the rear end 55 of the connecting member 53 are joined by brazing or welding, so that the airtightness in this portion is ensured.

[0003] However, in the above-described piping connection structure, airtightness at the connection portion is ensured exclusively by brazing or welding, but it is not easy to secure the airtightness by brazing or the like. Each time, it is necessary to perform an airtightness inspection.

In order to solve such a problem, a pipe 5
The terminal portion of 1 is expanded and caulked and fixed to the connecting member 53,
Proposals have been made to ensure the above-mentioned tightness (for example,
JP-A-63-57988, Japanese Utility Model Publication No. 2-44151).

[0005]

However, in the above proposal, a caulking structure is adopted between the pipe and the connecting member, so that the airtightness between them is relatively easily ensured. During a connection operation for connecting another pipe or the like to the connection member, the connection member may rotate with respect to the pipe, and the connection operation may be difficult.
Among the above proposals, Japanese Patent Application Laid-Open No. 63-57988 discloses a structure for preventing rotation of a connecting member, but leaves room for improvement in strength.

SUMMARY OF THE INVENTION An object of the present invention is to ensure the airtightness between a connecting member and an inlet / outlet pipe, to reliably prevent rotation of the connecting member with respect to the inlet / outlet pipe with a simple structure, to provide a high-quality assembling work. An object of the present invention is to provide a heat exchanger having excellent heat resistance.

[0007]

In order to solve the above-mentioned problems, a heat exchanger according to the present invention comprises a union connection around an end of an inlet / outlet pipe through which a heat exchange medium is introduced into and out of the heat exchanger. In a heat exchanger in which a member is attached and a nut provided at an end of another pipe is screwed to the connecting member, the connecting member is fixed to the core of the heat exchanger for fixing the inlet / outlet pipe. Characterized by being fixed by using the metal fittings. The method for fixing the connection member to an inlet pipe fixing metal fitting (hereinafter, also simply referred to as “metal fitting”) is not particularly limited. For example, the connection member and the metal fitting are brazed. A method, a method of caulking a fitting to the connection member, a method of clamping and fixing the connection member with the fitting, or the like can be adopted. It is also possible to employ a combination of the above methods.

It is desirable to form a flat locking portion on a part of the outer periphery of the connecting member. If the flat locking portion is locked to the metal fitting, a stronger and more reliable fixing structure can be realized.

In the above-described heat exchanger, the connecting member is fixed to the inlet / outlet pipe fixing metal fitting.
Rotation of the connecting member with respect to the pipe is reliably prevented, and assembling workability can be improved. In addition, since the metal fitting is conventionally fixed to the heat exchanger core for pipe fixing, it is possible to prevent an increase in cost due to a substantial increase in the number of parts and to fix the connection member. As a result, the pipe is also fixed at the same time, so that the original function of the fitting can be achieved. Furthermore, in the present invention, the effect of preventing the rotation of the connection member with respect to the pipe can be sufficiently ensured by fixing with the above-described metal fittings. If it is enough. Therefore, a known method (for example, brazing, caulking, etc.) can be adopted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the heat exchanger of the present invention will be described below with reference to the drawings. FIG. 1 shows a heat exchanger according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a heat exchanger core.
The heat exchanger core 1 has a pair of headers 2 and 3, a plurality of tubes 4 communicating the headers 2 and 3 with each other, and fins 5 disposed between the tubes 4.

The header 3 has an inlet (outlet) through which a heat exchange medium (for example, a refrigerant) is introduced (derived) into the heat exchanger.
The pipe 6 is connected. A union 7 as a connection member is attached to an end of the inlet (outlet) pipe 6. The joint between the union 7 and the pipe 6
The end can be secured by employing a known method such as expanding the end portion and caulking the union 7.

A flat locking portion 8 is formed on a part of the outer periphery of the union 7. A bag-shaped nut 19 provided at the end of another pipe 20 as shown in FIG. 5 is screwed into the union 7.

A metal fitting 9 for fixing an inlet (outlet) pipe is fixed to the header 3. The metal fitting 9 includes an L-shaped member 10 formed substantially in an L shape and a member 11. The flat locking portion 8 of the union 7 is locked to one ends 12 and 14 of the members 10 and 11. More specifically, one end 12, 1 of member 10, 11 is attached to flat locking portion 8 of union 7.
By caulking 4, the above-described locking structure is formed. The other end 13 of the member 10 is fixed (for example, brazed) to the header 3, and the other end 15 of the member 11 is connected to the L-shaped member 10 via a screw 16. Further, the flat locking portion 8 and one ends 12, 14 of the members 10, 11 are provided.
Then, the union 7 is clamped and fixed by the metal fittings 9.

The flat locking portion 8 of the union 7 and the member 1
The brazing of one end 12, 14 of the 0, 11 can be done simultaneously with the brazing of the heat exchanger core 1 in the furnace.

The heat exchanger core 1, more specifically, the headers 2 and 3, are provided with mounting members 17 for mounting the heat exchanger to a vehicle or the like. Further, a flange 18 for connecting an outlet (inlet) pipe (not shown) is attached to the header 2.

In the heat exchanger as described above, since the union 7 as the connecting member is fixed to the fitting 9, the rotation of the union 7 with respect to the pipe 6 is reliably prevented, and the workability of assembling the nut 19 is reduced. Can be improved. Further, since the metal fitting 9 is conventionally fixed to the heat exchanger core 1 for fixing the pipe, it is possible to prevent a cost increase due to a substantial increase in the number of parts. Further, by fixing the union 7, the pipe 6 to which the union 7 is attached is also fixed at the same time, so that the original function of the metal fitting 9 is fulfilled. In addition, the effect of preventing the union 7 from rotating with respect to the pipe 6 can be sufficiently secured by fixing with the metal fitting 9, so that the joint between the union 7 and the pipe 6 is sufficient as long as it can mainly ensure airtightness. In other words, known methods (caulking, brazing, etc.)
And the above airtightness can be ensured.

[0017]

As described above, when the heat exchanger of the present invention is used, the airtightness between the connecting member and the inlet / outlet pipe is ensured, and the rotation of the connecting member with respect to the inlet / outlet pipe is simple. Therefore, a high-quality heat exchanger excellent in assembling workability can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A of the heat exchanger in FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view of a pipe connection structure of the heat exchanger in FIG. 1;

FIG. 4 is an enlarged front view of a flange of the heat exchanger in FIG. 1;

FIG. 5 is an enlarged sectional view of a nut screwed into the flange of FIG. 4;

FIG. 6 is an enlarged sectional view of a conventional pipe connection structure of a heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger core part 2, 3 Header 4 Tube 5 Fin 6 Inlet (outlet) piping 7 Union 8 Flat locking part 9 Inlet (outlet) piping fixing metal fitting 10 L-shaped member 11 Member 12, 14 One end 13, 15 Other end 16 Screw 17 Mounting bracket 18 Flange 19 Nut 20 Other piping

Claims (5)

[Claims] 1. A connecting member made of a union is attached to an outer periphery of an end of an inlet / outlet pipe for introducing / exiting a heat exchange medium into / from a heat exchanger, and a nut provided at an end of another pipe to the connecting member. Wherein the connecting member is fixed using the fitting for fixing the inlet / outlet pipe fixed to the core of the heat exchanger. 2. The heat exchanger according to claim 1, wherein the connection member is brazed to a fitting for fixing the inlet / outlet piping. 3. The heat exchanger according to claim 1, wherein the connection member is caulked to a fitting for fixing an inlet / outlet pipe. 4. The heat exchanger according to claim 1, wherein the fitting for fixing the inlet / outlet pipe holds and fixes a connecting member. 5. The connection member according to claim 1, wherein a part of an outer periphery of the connection member is formed in a flat locking portion, and the flat locking portion is locked to the inlet / outlet pipe fixing bracket. 5. The heat exchanger according to any one of 4.