JPH07100635A - Method for brazing heat treatment parts - Google Patents

Abstract

PURPOSE:To provide a brazing method of a heat treatment parts, by which clad material is not used and the brazing of parts to be joined is executed in good condition. CONSTITUTION:A paste-like material formed by mixing at least powdery brazing filler metal and non-corrosive flux, is applied to a brazing position of the parts to be joined. As the brazing is executed to the parts to be joined mutually while applying the heat to these, the parts to be joined are unnecessary to form with the clad material and the work of each parts is made to be easy and also, the flow-out of the brazing filler metal at the time of heating can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method for heat exchanger parts useful for manufacturing various heat exchangers.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger of this type shown in FIG. 4 has been known (for example, Japanese Patent Laid-Open No. 62-5097).

This heat exchanger is called a laminated type,
A plurality of laminated tube elements 1, a plurality of corrugated fins 2 interposed between the tube elements 1, side plates 3 covering the corrugated fins 2 at both ends, and an inlet / outlet connected to the tube elements 1 at both ends. It is composed of a tube 4. Tube element 1
Is a plate 11 having a tank depression and a flow passage depression.
And a U-shaped internal flow path extending from one tank portion to the other tank portion formed on the upper left and right sides. Plate 11, corrugated fin 2
The side plate 3 and the side plate 3 are both formed by appropriately pressing a plate material such as aluminum. The plate 11 is a clad material having both surfaces coated with a brazing material, the side plate 3 is a single-sided clad material, and the corrugated fin 3 is used. Non-clad materials are used for each.

In the above heat exchanger, flux is applied to the mutual joint portion of the plate 11 which is a brazing portion, the joint portion of the plate 11 and the corrugated fin 2 and the joint portion of the corrugated fin 2 and the side plate 3. Is manufactured by temporarily assembling and fixing each component while applying, and placing the components in a brazing furnace to collectively braze them, and then brazing the inlet / outlet pipe 4.

[0005]

In the above-mentioned conventional heat exchanger, at least one of the parts to be joined is formed of a clad material, and the clad material is usually coated on both sides or one side with a brazing material. In other words, in other words, the brazing material is coated even on the portion that does not require brazing, which is wasteful and disadvantageous in terms of cost. In addition, the clad material is more difficult to perform press working and the like than the non-clad material, and the brazing material other than the bonded portion flows during heating, which impairs the appearance.

The present invention has been made in view of the above circumstances. An object of the present invention is to use a clad material,
Moreover, it is another object of the present invention to provide a brazing method for heat exchanger components, which can favorably braze the components to be joined.

[0007]

In order to achieve the above object, in the invention according to claim 1, a paste-like material formed by mixing at least a powdery brazing material and a flux is applied to a brazing part of a component to be joined. It is applied, and heat is applied to this to braze the parts to be joined to each other. Further, in the invention according to claim 2, a non-corrosive flux is used as the paste-like flux.

[0008]

In the invention according to claim 1, since the paste-like material formed by mixing the powdered brazing material and the flux is applied to the brazing portion of the parts to be joined, brazing is performed.
Since it is not necessary to form the parts to be joined from a clad material, the processing of each part is facilitated and the brazing material flow during heating can be prevented.

According to the second aspect of the present invention, in addition to the above-mentioned action, since the non-corrosive flux is used, cleaning after brazing is unnecessary.

[0010]

1 to 3 show an example in which the present invention is applied to the laminated heat exchanger shown in FIG.

The parts such as the plate 11, the corrugated fins 2 and the side plates 3 which constitute the heat exchanger are all formed by appropriately pressing an aluminum plate material not covered with a brazing material. As shown in FIG. 2, the plate 11 has a pair of left and right tank recesses 11a in the upper portion and a flow path recess 11b in the other portion, and each tank recess 11a is formed with an inlet / outlet hole 11c. , Channel recess 1
1b includes a central partition projection 11d and a plurality of oblique projections 11e.
Are formed respectively. Further, a brim 11f for brazing which is continuous with the partitioning projection 11d is formed on the peripheral edge of the plate 11.

The brazing work will be described below. Prior to the work, a paste-like material for brazing is prepared in advance. This paste is formed by mixing Al-Si powder aluminum brazing filler metal, a non-corrosive flux and an organic binder in a predetermined ratio, and the non-corrosive flux is a fluoride-based one. For example KAlF ₄ and K
A mixture of ₂ AlF ₅ .H ₂ O is used, and alcohols, ketones, etc. are used as the organic binder.

In brazing, first, the paste-like material is applied to one of the mutual joints (partition 11e, collar 11f, etc.) of the plate 11 and at least one of the joints of the plate 11 and the corrugated fins 2. Corrugated fin 2
Each component is temporarily assembled and fixed while being applied to at least one of the joints between the side plate 3 and the side plate 3, and this is put into a brazing furnace and collectively brazed (see FIG. 1). Then, paste the above-mentioned paste into the tube elements 1 at both ends.
Is applied to at least one of the inner surface of the hole 1a and the end portion of the inlet / outlet pipe 4, and the end portion of each inlet / outlet pipe 4 is inserted into the hole 1a to be brazed by a torch (see FIG. 2).

According to the brazing method described above, the paste-like material containing the brazing material and the flux is applied to the brazing portion of the parts to be joined such as the plate 11 for brazing, so that each part is clad. It is not necessary to form it from a material, which is advantageous in terms of cost.

Further, since a non-clad material can be used for each part, press working and the like can be easily performed, and improvement in part accuracy can be expected.

Further, since the paste-like material is applied only to the brazing portion, it is possible to prevent the flow of the brazing material as in the conventional case and maintain the good appearance.

Furthermore, since a non-corrosive flux is used as the flux, cleaning after brazing is unnecessary and workability can be improved.

Although the present invention is applied to the laminated heat exchanger in the above embodiment, the present invention is not limited to the brazing of parts in the serpentine heat exchanger shown in FIG. It can be appropriately used for brazing of the corrugated fin 22 and the corrugated fin 22, brazing of the corrugated fin 22 and the cover plate 23, brazing of the meandering tube 21 and the union 24, and the like. Further, brazing of parts in the multi-flow heat exchanger shown in FIG. 6, more specifically, brazing of the tube 31 and the header pipe 32, the tube 31
And corrugated fins 33, header pipe 32 and inlet / outlet pipes 35, 36, and
It can be appropriately used for brazing the outlet pipes 35 and 36 to the unions 37 and 38.

[0019]

As described in detail above, according to the first aspect of the present invention, the paste-like material containing the brazing material and the flux is applied to the brazing portion of the parts to be joined for brazing. Therefore, it is not necessary to form each component from the clad material, which is advantageous in terms of cost. Further, since a non-clad material can be used for each part, press working etc. is easy and improvement of part accuracy can be expected. Further, since the paste-like material is applied only to the brazing portion, it is possible to prevent the flow of the brazing material as in the conventional case and maintain the good appearance.

According to the invention of claim 2, since the non-corrosive flux is used as the flux, cleaning after brazing is unnecessary and workability can be improved. The other effects are the same as in claim 1.

[Brief description of drawings]

FIG. 1 is a diagram showing a brazing procedure when the present invention is applied to a laminated heat exchanger.

2] Inner view of plate

FIG. 3 is a diagram showing a brazing procedure.

FIG. 4 is a side view of a laminated heat exchanger according to a conventional example.

FIG. 5 is a side view of a serpentine heat exchanger.

FIG. 6 is a side view of a multi-flow heat exchanger.

[Explanation of symbols]

1 ... Tube element, 2 ... Corrugated fin, 3 ...
Side plate, 4 ... Port pipe, 11 ... Plate, 21
... meandering tube, 22 ... corrugated fin, 23 ... cover plate, 24 ... union, 31 ... tube, 32 ...
Header pipe, 33 ... Corrugated fin, 34 ... Cover plate, 35 ... Inlet pipe, 36 ... Outlet pipe, 37, 38 ...
Union.

Claims (2)

[Claims] 1. A paste-like material formed by mixing at least a powdery brazing material and a flux is applied to a brazing site of parts to be joined, and heat is applied to this to braze the parts to be joined together. The method for brazing heat exchanger parts, characterized in that 2. The method for brazing a heat exchanger component according to claim 1, wherein the flux of the paste-like material is non-corrosive.