JPS59225900A - Production of heat exchanger - Google Patents

Abstract

PURPOSE:To simplify production process in the stage of producing a heat exchanger having a core part with a flat perforated pipe and corrugated fins by using another brazing filler metal in performing brazing of the flat pipe and a branch pipe or confluent pipe. CONSTITUTION:A slender hole is formed to a pipe 7 formed integrally with a confluent pipe and an outlet tube or a branch pipe and an inlet tube and the end of a flat perforated pipe 1 is fitted into said hole. A brazing filler metal 8 is disposed in the juncture thereof. A material which is not clad with a brazing filler metal and has good brazability is used for the pipe 7. The brazing filler metal which is pressed to a plate shape having about 0.5-1.5mm. thickness and consists of a curved part 81 in tight contact with the outside circumferential surface of the pipe, a blanked hole 82 of the sectional shape slightly larger than the sectional outside shape of a flat perforated pipe 1 and a rising part 83 around the same is used. The assembly is heated in a furnace to braze the pipe 7 and the flat perforated plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger used in an evaporator or the like of an automobile cooling system, and more particularly to a heat exchanger whose core portion is formed by a flat multi-hole tube and a corrugated fin.

Conventionally, this type of heat exchanger has been manufactured by the following method. Flat multi-hole pipe is A1050 or A30
It is manufactured by extrusion processing of aluminum such as 03, and is bent into a serpentine shape as shown by symbol 1 in FIG. On the other hand, as shown in Fig. 2, corrugated fins are made of aluminum brazing fins 1 and 4, in which the core material 2 is A 3003, etc., and the skin material 3 is aluminum row containing S], 5 to 12 weight. The material used is corrugated. Then, the corrugated fins can be placed on the parallel part of the flat multi-hole pipe and assembled. Further, as shown in Fig. 6, a hole having a cross-sectional outline that is almost the same as that of the flat multi-hole pipe is formed in an aluminum electric resistance welded pipe (aluminum clad pipe) 5 which is cylindrical and has a combination structure of a core material and a skin material similar to the fin material. 6 is installed as a window for two. Then, the holes 6 of the electric resistance welded tube 5 are press-fitted to both ends of the flat multi-hole tube 1, respectively. In this way, the electric resistance stitch 7r) that has been examined becomes a branch pipe and a merging pipe. Finally, corrugate fins and ERW tubes are brazed to the flat multi-hole tube using furnace brazing.

Manufactures heat exchangers. If flux is used when brazing the aluminum, apply the flux to the surface of the fin material and the surface of the electric resistance welded pipe 9 times before passing through the furnace. Furthermore, in normal cases, the finished product is made by connecting the two tubes into the branch pipe and the converging pipe, the outlet pipe, and the pipe. However, the conventional manufacturing method as described above has the following drawbacks.

■ The manufacturing process for aluminum ERW pipes is complicated.

The cost will be high.

■ As shown in Fig. 4, when the electric resistance welded pipe 5 is constructed such that the soldering part is sometimes located at the bottom, it is difficult for the soldering material to flow to the joint, making it difficult to perform the soldering process.

■ When a branch pipe or a merging pipe is integrated with an inlet tube or an outlet tube and molded with an electric resistance welded pipe.

When brazing, L7- sometimes flows too much and causes brazing, etc.
: Causes problems on top and appearance.

Therefore, the present invention is capable of brazing the flat pipe and the final flow pipe or the merging pipe without relying on the (1) advantage of the electric resistance welded pipe.
By using materials.

This is an attempt to eliminate the above-mentioned drawbacks.

The present invention includes a core portion formed by arranging corrugated fins on parallel parts of a flat multi-hole tube bent in a serpentine shape, and an internal fluid provided at both ends of the flat multi-hole tube. Using a plate-shaped brazing material having a punched hole with a slightly larger cross-sectional shape and 10 vertical sections around the punched hole, simultaneously connect the branch pipe and the merging pipe to the flat multi-hole pipe at the same time as the core part. A method for manufacturing a heat exchanger is obtained, which is characterized by brazing.

According to the heat exchanger manufacturing method of the present invention, it is possible to use the necessary amount of brazing material in the necessary places.

It is economical and at the same time can be used with 9 branch pipes or merging pipes. 3- It is integrally molded with the rotube or the protruding tube.

Can be brazed in the furnace at the same time as the core of the heat exchanger.
There is no need to retrofit an inlet/outlet tube like in the past, and the manufacturing process can be significantly reduced.

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

FIG. 5 shows the state before the furnace brazing operation in one embodiment of the present invention. In FIG. 5, pipe 7 is 1
The confluence pipe and the outlet tube are integrally molded, or the branch pipe and the inlet tube are integrally molded, and the side has a long and narrow hole (not shown) similar to the one shown by symbol 6 in Figure 6. ) is formed, the end of the flat multi-hole pipe 1 is fitted into the hole, and the brazing material 8 is positioned at the connection between the pipe 7 and the flat multi-hole pipe 1. Here, the pipe 7 is made of a material that is not clad with brazing material and has good brazing properties, such as A3003 or A1050. It goes without saying that when a merging pipe corresponds to one end of the flat multi-hole pipe 1, a branch pipe corresponds to the other 4 ends.

Low month 8 is 1 e.g. BA4343. BA4045゜BA
A plate material made of 4047 or the like and having a thickness of about 11.5 to 1.5 mm is pressed into the shape shown in FIG. 6. That is, the brazing material 8 is the pipe 7
A plate portion 81 curved so as to fit closely to the outer circumferential surface of the flat multi-hole tube 1, a punching 682 having a cross-sectional shape slightly larger than the cross-sectional shape of the flat multi-hole tube 1, and a rising portion 83 around the punching 682.
It has a shape that has

As shown in FIG. 5, such a brazing material 8 is placed in a fitted state at the joint between the pipe 7 and the flat multi-hole tube 1, and the brazing process is carried out in the furnace. It is possible to provide a heat exchanger which has been brazed and is well-brazed at a low cost.

[Brief explanation of drawings]

Figure 1 is a perspective view of a flat multi-hole pipe bent in a serpentine shape, Figure 2
The figure is an enlarged cross-sectional view of an aluminum brazing seam I for making corrugated fins, and Figure 3 is a perspective view of an electric resistance welded pipe that becomes a branch pipe or a merging pipe. FIG. 4 is a side view showing the conventional problems, FIG. 5 is a perspective view showing the connection between the vibrator and the flat multi-hole pipe in which the furnace brazing material is to be worked in an embodiment of the present invention. The figure is a perspective view of the brazing material used in the same example. 1...Flat multi-hole pipe, 5...Aluminum electric resistance welded pipe, 6...
hole. 7... Pipe, 8... Low interest, 81... Plate part, 8
2...Punched hole, 83...Rising portion. 7- Figure 3 Figure 4

Claims (2)

[Claims] (1) A core part consisting of corrugated fins arranged in the parallel part of a flat multi-hole tube bent in a serpentine shape, and a slightly larger cross-sectional shape that distributes or collects internal fluid at both ends of the front flat multi-hole tube. A plate-shaped brazing material having a punched hole and a vertical section around the punched hole is used, and the branch pipe and the merging pipe are brazed to the flat multi-hole pipe at the same time as the core part. Features: A method for manufacturing a heat exchanger. (2) The end portion of the side wall of the meandering flat multi-hole pipe is fitted into a hole formed in the pipe wall of the branch pipe and the recessed confluence pipe to which it fits. How to manufacture the described heat exchanger θmi.