JP2544426Y2 - Heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat exchanger mainly used for a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in this type of heat exchanger, a spacer is interposed between the inlet / outlet portion and the pipe to connect the inlet / outlet portion of the tank and a pipe for supplying a heat exchange medium by argon welding. Such a configuration is well known (for example, see Japanese Utility Model Application Laid-Open No. 63-149885).

[0003] However, the conventional joining structure in which the spacer is interposed is a surface joining, so that there is a problem that a brazing defect is likely to occur and leakage occurs.

In addition, since a spacer is required, there is a problem that the number of parts is large and the number of assembling steps is extra.

In view of the above problems, an object of the present invention is to provide a heat exchanger in which the brazing between the inlet and outlet and the pipe is reliable and easy, and the number of parts is reduced.

In order to achieve the above object, a heat exchanger according to the present invention is a heat exchanger in which a pipe for supplying a heat exchange medium is connected to an inlet / outlet provided in a tank.
Flare with the tip of the entrance opening tapered outward
Formed, and the pipe is inserted into the entrance from the flare, and a brazing material is inserted into a gap generated between the flare and the pipe.
A heat exchanger characterized by being inserted and brazed by torch brazing .

[0007]

Therefore, the pipe is inserted into the entrance from the flare at the tip and the gap formed between the flare and the pipe.
If the brazing material is inserted and brazed by torch brazing , the brazing material is put into the gap between the flare and the pipe and filled, so that the entrance and exit and the pipe are tightly joined, Contact is assured. Also, torch brazing may become not essential spacer was necessary with argon welding, part number and discharge the spacers are removed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, the heat exchanger comprises a tube element 1 and corrugated fins 2 which are alternately arranged in a plurality of stages and are stacked in a multi-stage manner, and end plates 3 and 3 are arranged at both ends in the stacking direction. The tube elements 1a joined to the end plates 3, 3 are provided with inlet / outlet portions 9, 9 and are integrally brazed in a furnace.

The tube element 1, 1a has a substantially rectangular shape and is formed by joining two molded plates 4, 4, and 4a, 4b, and has openings 5a, 5 at one longitudinal end thereof.
A pair of tanks 5 and 5 formed with a are formed to bulge, and a substantially U-shaped heat exchange medium passage 6 communicating with the tanks 5 and 5 is extended toward the other end. An entrance / exit portion 9 for supplying a heat exchange medium is formed on the side of the tanks 5 and 5 of the tube elements 1a disposed at both ends in the stacking direction. 7 is a tube element 1, 1
This is a tube element contact portion for joining the other end side of "a", and is bent outward.

The tube elements 1 and 1a are stacked in a multi-stage manner by joining tanks 5 and 5 and a tube element contact portion 7 which are adjacent and opposed to each other.
5 are communicated through the openings 5a, 5a, and the connected tanks 5, 5 supply a heat exchange medium (for example, refrigerant or engine cooling water) to the heat exchange medium passage 6 of each tube element 1, 1a. A tank group is configured. When the heat exchange medium supplied from the tank group communicating with one of the inlet / outlet portions 9 flows through the heat exchange medium passage 6 of each of the tube elements 1 and 1a, heat is exchanged with external air. After the exchange, the heat exchange medium is discharged to the outside from a group of tanks communicating with the other entrance / exit portion 9.

Next, the structure of the entrances and exits 9 and 9 serving as the entrance and exit of the heat exchange medium of the heat exchanger and the connection structure between the entrances and exits 9 and 9 and the pipe 10 for supplying the heat exchange medium will be described with reference to FIGS. This will be described with reference to FIG.

The entrance / exit portions 9, 9 are formed with molding plates 4a, 4
b, which are formed by joining entrance members 8, 8 projecting sideways from one of the tanks 5, 5 of the tube elements 1a, 1a arranged at both ends in the stacking direction. A base pipe portion 11 which is formed to project laterally and communicates with the tanks 5 and 5; and a fitting pipe portion which is provided to extend outside the base pipe portion 11 and in which the tip of the pipe 10 is fitted and abutted. 1
2 and a flare 13 which is provided outside the fitting tube portion 12 (at the tip of the entrance 9) and is extended outward with a diameter larger than the diameter of the fitting tube portion 12. Have been. The flare 13 is formed in a flare shape having a predetermined gradient, and a predetermined gap A is formed between the flare 13 and the pipe 10 inserted into the entrances 9. Has become. A slit 14 is formed on the side of the flare 13 for convenient pouring of the brazing material.

The connection between the entrances 9 and the pipe 10 is made after the heat exchanger is assembled. In order to connect the entrances and exits 9 and the pipe 10, first, the pipe 10 is fitted until it comes into contact with the step 12 a of the insertion tube portion 12 of the entrances and exits 9. Next, the brazing material 15 is inserted into the gap A formed between the flare 13 of the entrances 9 and the pipe 10 and the pipe 10, and the torch brazing is performed by a so-called NB torch brazing method. The pipe 10 is connected. In this brazing, the gap A is filled with the melted brazing material, so that the gap between the entrances 9 and the pipe 10 and the pipe 10 is satisfactorily brazed without a gap, and leakage is prevented from occurring between the gaps. You. This torch brazing can be automatically performed using a robot or the like.

However, in this heat exchanger, as described above, the front end of the entrance / exit portion 9 is formed in a flared shape in which the end is expanded. In this case, the brazing material can be easily injected into the flare-shaped portion (the inside of the flare 13), and the gap is filled and filled with the molten brazing material. Are tightly connected, and brazing can be reliably performed as compared with the conventional surface joining. Therefore, the soldering failure can be avoided and no leakage occurs, and the reliability of the product can be improved. Further, since the front end of the entrance 9 has an expanded flared shape, the pipe 10 can be easily inserted. In addition, since the torch brazing is possible in the connection method, it is possible to reduce the number of components by eliminating the spacer required for argon welding and eliminating the spacer.

[0016]

[Effect of the invention] As described above, according to the invention,
Wherein the tip of the flare by fitting the pipe inlet and outlet part frame
Insert brazing material into the gap created between
Since the brazing is performed by brazing, it is possible to easily insert the brazing material into the gap between the inside of the flare and the outer surface portion of the pipe, and the gap is filled and filled with the molten brazing material. As a result, the port and the pipe are closely connected to each other, so that brazing can be performed more reliably than in the conventional surface joining. Therefore, due to the certainty of the brazing secured by this connection structure, poor brazing is reliably avoided and no leakage occurs, and the reliability of the product can be improved. Further, since the front end of the entrance / exit portion has an expanded flared shape, it is easy to insert a pipe. Furthermore, since the torch brazing is possible in the connection method, the spacer required for argon welding is not required, and the spacer can be eliminated to reduce the number of parts, thereby reducing cost and production efficiency. Improvements can be realized.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view of a main part of the above.

FIG. 3 is an enlarged side view of a main part of the above.

FIG. 4 is an enlarged sectional view of a forming plate according to the first embodiment;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tube element 2 fin 5 tank 9 doorway 10 pipe 11 base pipe 12 fitting pipe 13 flare 15 brazing material

Claims (1)

(57) [Scope of request for utility model registration] 1. A heat exchanger odor formed by connecting a pipe for supplying the heat exchanger medium to the inlet and outlet portions provided in the tank
The flare which opened the tip of the entrance part outward in the shape of a taper
Formed, and the pipe is inserted into the entrance from the flare, and a brazing material is inserted into a gap generated between the flare and the pipe.
A heat exchanger characterized by being inserted and brazed by torch brazing .