JPS6219940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a component connecting method for connecting a component having a center hole, such as a base, to an aluminum pipe by vacuum brazing.

Aluminum materials (including aluminum alloy materials).
same as below. ) It has been conventional practice to bond parts manufactured by vacuum brazing to make capacitors and other products. To explain an example with reference to FIG. 1 showing an embodiment of the present invention, a capacitor 1 has a core portion 4 formed by sandwiching fins 3, 3 between a meandering flat tube 2, and both ends of the flat tube 2. The caps 6, 6 are attached to the open ends of the circular tubes 5, 5 connected to the parts 2, 5.
To join 3, 4, 5, and 6, interpose a brazing material between each part (for example,
Uses clad material laminated with brazing filler metal. ), the entire capacitor 1 is placed in a vacuum heating furnace to melt the brazing material, thereby bonding each component with the brazing material. In addition, the connection between the circular tube 5 and the cap 6 is as follows:
In some cases, the material is brazed in advance using a torch brazing method or the like before being placed in the vacuum heating furnace.

However, such conventional component connection methods have the following disadvantages. That is, when connecting the cap 6 to the lower part of the circular tube 5, for example, conventionally, as shown in FIG. 6b, the end of the circular tube 5 is inserted into the large diameter section 6b, and the melted material is inserted into the gap 7 formed between the inner circumferential surface of the large diameter section 6b and the outer circumferential surface of the circular tube 5. The circular pipe 5 and the cap 6 were connected by pouring a brazing filler metal.

In such a conventional method, when pouring the brazing filler metal into the gap 7 in a vacuum heating furnace as described above, the circular tube 5 and the cap 6 are connected so that they are accurately connected. It is necessary to hold them down with a jig and put them into the furnace, and even if they are put into a vacuum heating furnace after being joined by torch brazing in advance, the solder in the gap 7 will melt due to the heat, so it is still necessary to put them together correctly. A jig is required for joining. Using such jigs to hold two parts in the correct engagement state not only requires skill, but also exposes the jigs to high temperatures repeatedly, which leads to rapid wear and tear on the jigs and increases the cost of the product. .

The present invention aims to eliminate the drawbacks of the conventional methods as described above, and to provide a method for connecting parts to an aluminum pipe having a center hole, which allows parts to be easily connected and reduces product costs. be.

Hereinafter, the connection method of the present invention will be explained with reference to drawings showing embodiments.

FIG. 2 shows a state in which the base 6 is being connected to the lower end of the circular tube 5 by the connection method of the present invention. The structure of the cap 6 is the same as the conventional cap shown in FIG. That is, a center hole 6a is formed in the center of the cap 6 and extends vertically, and the upper part of the center hole 6a is a large diameter portion 6b. On the other hand, the lower end portion of the circular tube 5 inserted and fixed into the large diameter portion 6b is slightly enlarged in diameter to form a large diameter portion 5a. The outer diameter of the large diameter portion 5a is formed to be slightly larger than the inner diameter of the large diameter portion 6b so that the large diameter portion 5a can be press-fitted into the large diameter portion 6b without wobbling.

With the configuration shown in Fig. 2, the circular tube 5 and the cap 6 are assembled.
To connect them, first, the large diameter part 5a of the circular tube 5 is press-fitted deep into the large diameter part 6b of the center hole 6a of the base 6. As a result, the circular tube 5 engages with the base 6 without any play, and a bottomed cylindrical gap 7 is formed between the two, so that an annular brazing filler metal is inserted into the upper end opening of the gap 7. 8 and put the whole thing into a vacuum heating furnace.
When heating is performed in a vacuum heating furnace, the brazing filler metal 8 melts and flows into the gap 7, filling the gap 7, and some of the brazing filler metal melts between the outer surface of the large diameter portion 5a and the large diameter portion 6b. It also penetrates into minute gaps between the inside surface and the inside surface. Therefore, after the brazing filler metal 7 has solidified, the circular tube 5 and the cap 6 are completely joined together, and no leakage occurs at the joint between the two.

FIG. 3 shows a second embodiment of the present invention. Whereas the first embodiment shown in FIG. 2 has a base 6 connected to the lower end of the circular tube 5, this embodiment An example is shown in which a base 6 is coupled to the part. The upper end portion of the circular tube 5 is slightly expanded in diameter to form a large diameter portion 5b. A flange-like large diameter portion 6c is provided at the lower end of one of the caps 6.
is formed. The outer diameter of the large diameter portion 6c is formed to be slightly larger than the inner diameter of the large diameter portion 5b so that it can be press-fitted into the large diameter portion 5b lightly without rattling.

In this embodiment, in order to connect the circular tube 5 and the cap 6, first the large diameter portion 6c of the cap 6 is press-fitted deep into the large diameter portion 5b of the circular tube 5. As a result, the cap 6 engages with the upper end opening of the circular tube 5 without play, and a bottomed gap 7 is formed between the two. After that, as in the first embodiment described above, if the brazing material 8 is placed on the upper part of the gap 7 and heated in a vacuum heating furnace, the circular tube 5 and the cap 6 are heated.
are strongly connected.

In each of the above embodiments, the work of fitting the circular tube 5 and the cap 6 and assembling them in the correct engagement state requires more skill than the work of holding them together using a conventional jig. It's much easier.

Furthermore, in the above embodiments, the connection between the circular pipe and the cap was described, but the present invention is applicable not only to the cap but also to any other component (including the circular pipe) as long as it has a through hole inside. ) can also be applied to connections between

As described above, the method for connecting parts to aluminum pipes of the present invention does not require expensive jigs when connecting parts to aluminum pipes, and can be easily performed, resulting in lower product costs, etc. The above effect is great.

[Brief explanation of the drawing]

FIG. 1 is a front view of a capacitor manufactured by the method of the present invention, and FIG. 2 is a front view of a capacitor manufactured by the method of the present invention.
FIG. 3 is an enlarged sectional view taken along line AA in the figure, FIG. 3 is a sectional view taken along line BB showing the second embodiment, and FIG. 4 is a sectional view similar to FIG. 2 illustrating the conventional method. 2: flat tube, 5: circular tube, 5a, 5b: large diameter section,
6: Cap, 6a: Center hole, 6b, 6c: Large diameter part,
7: Gap, 8: Brazing material.

Claims (1)

[Claims] 1 An aluminum pipe is used as one member, and a part to be connected to the pipe is used as the other member,
When connecting both members in a liquid-tight manner, the large diameter portion of the upper member having a large diameter portion bulging outward at the lower end is formed at the upper end of the center hole of the lower member. After being press-fitted into the large diameter part, the brazing filler metal 8 is placed at a position where it will flow after melting into the bottomed gap 7 formed at the fitting portion of both the members, and heated in a vacuum heating furnace. A method for connecting parts to an aluminum pipe, characterized in that the above member located above and the member located below are connected by melting and flowing into the gap 7.