JPS61172688A - Method for joining of pipe member of compressor - Google Patents

Abstract

PURPOSE:To prevent the generation of cracking in a brazed part by joining preliminarily a pipe member and the top end of a joint by brazing then joining the member and joint to a case by resistance welding. CONSTITUTION:The diameter D1 of an upper inserting part of the joint 11 is made smaller than the diameter D2 of a lower electrode receiving part and an electrode receiving surface 14 is formed as a tapered surface. The pipe member 3 and the inserting part 12 of the joint 11 are preliminarily brazed along the top end face of the inserting part to form the brazed part 15, by which a joint body 16 is prepd. The body 16 with the part 15 faced upward is inserted into the through-hole of the case 2 and the body 16 and the case 2 are resistance-welded via electrodes 3 and 14. Since the diameter D1 of the joint is made smaller than the diameter D2, the stress of the brazed part 15 in the stage of thermal shrinkage is weakened. The cracking of the part 15 is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for joining pipe members such as a guide and a main tube by penetrating the case of a compressor, which is improved.

[Technical background of the invention and its problems]

As shown in FIG. 4, a pipe member 4 and 3 is connected to the upper part of the case 2 of the hermetic compressor 1. As shown in FIG.

This guide pipe 3 is generally made of glossy copper. Although it is possible to directly join the guide die f3 to the case 2, brazing requires a long time and is inefficient, so as shown in Fig. 5, the above guide die f3 is fitted into the iron joint 4. , the rear end side 4a of this di 1 India 4
A joined body 6 is prepared in advance in which the rear end side of the guide sleeve 3 is protruded from the guide, a brazed part 5 is formed along this protruding part, and the guide/mother ear #3 and the joint 4 are brazed and joined. I'll keep it. After inserting this joined body 6 into the through hole 7 provided in the case 2 of the compressor 10, electrodes 8 and 9 are provided opposite to the upper surface of the case 2 and the rear end side 4a of the joint 4, respectively. . Although this method improves productivity, it has the following drawbacks. In other words, the brazing part 5 and the above-mentioned electrode receiving surface -)
:l Since the rear end side 4g of India 4 is on the same plane,
Since stress generated during pressurization during resistance welding strongly acts on the brazed portion 5, there is a drawback that cracks occur in the brazed portion 5. Furthermore, since the brazed portion 5 and the electrode receiving surface 41 are on the same plane, the contact area necessary for resistance welding cannot be secured, so there is a drawback that the strength of resistance welding is unstable. Further, since the portion 10 to be resistance welded and the brazed portion 5 are close to each other, cracks may occur in the brazed portion 5 due to heat shock during resistance welding.

[Purpose of the invention]

This invention was made in consideration of the above circumstances, and aims to provide a method for joining pipe members of a compressor that prevents the occurrence of cracks in the brazed portion and improves the stability of resistance welding. be.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention connects a joint and a pipe member in advance by brazing at the distal end of the insertion portion of the cylinder.

[Embodiments of the invention]

Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1, in which the same components in FIG. 5 are given the same reference numerals. 11 in Figure 1 is the Indian seal, and this joint 11 is case 2.
0 The diameter D1 of the insertion portion 12 inserted into the through hole 7 is the diameter D of the lower electrode receiving portion 13! smaller than the electrode receiving surface 1
4 is formed on the Teno's arm surface which faces upward and becomes smaller in diameter. Then, after inserting the guide pipe 3 as a pipe member so as to protrude from the distal end of the insertion section 12 of the sylind 11, the f-id/guide 3 and the sylind 11 are rolled along the upper end surface of the insertion section 12. The soldered part I5 is formed by attaching the soldered part I5, and the joined body 16 is prepared in advance. Next, in order to weld this joined body 16 to the through hole 7 of the case 2, after inserting the soldered part 15 into the through hole 7 with the brazing part 15 facing upward, the electrode 8 is brought into contact with the upper surface of the case, and the electrode receiving surface is 14 is brought into contact with an electrode 17 having a Theno matrix on its upper surface, and these electrodes 8,
17 is pressurized and the joined body 16 is joined to the case 2 by resistance welding.

As in the above embodiment, since the diameter DI of the insertion portion 12 of the joint 1 is made smaller than the diameter D2 of the electrode receiving portion 13, the rigidity of the brazed portion 15 in the insertion portion 12 of the joint 11 can be weakened. Since the stress generated in the brazed portion 15 during heat shrinkage after brazing is weakened, it is effective in preventing the occurrence of cracks. In addition, the electrode receiving surface 14 is shaped like a chi Δ, and the upper surface of the electrode 17 that comes into contact with the electrode receiving surface 14 also has a chi Δ shape.
Since the electrodes 17 are formed into four shapes, the positioning of the electrodes 17 is facilitated.

Next, we will introduce a second model in which the same components in Fig. 1 are given the same symbols.
The figure shows a second embodiment of the invention, in which 21 is a joint. Inner peripheral part 22 of insertion part 22 of this joint 21
A large diameter portion 23 is formed in the upper part of a. Then, the guide pipe 3 is inserted into the inner circumferential portion 22a, and the tip portion is made to protrude. Next, the joined body 16 is formed by brazing along the distal end of the insertion portion 22.

In this way, since the large diameter portion 23 is provided in the inner peripheral portion 221 formed in the insertion portion 22 of the joint 21, this large diameter portion 2
3 serves as a reservoir for the soldering material, prevents the soldering material from flowing out, makes it easy to insert the joint 16 of the joint 21 and the guide pipe 3 into the through hole 7 of the case 20, and improves productivity. improves.

FIG. 3 shows a third embodiment of the present invention, in which reference numeral 31 denotes an inner periphery 3 of an insertion portion 32 of this shield 31.
2a is provided with a brazing material reservoir 33 which becomes larger in diameter toward the outside.

Since the reservoir 33 is provided as described above, it is possible to completely prevent the brazing material from flowing out.

[Effects of the Invention] As explained above, in this invention, since the pipe member and the sylind are brazed in advance at the tip of the insertion part of the joint, the joined body of the pipe member and the sylind is soldered in the case. When performing resistance welding on the through-hole formed in the hole, it is possible to ensure that the electrode receiving part and the soldering part are in different positions, and to secure the contact area with the electrode necessary for resistance welding. The distance between the brazed part and the resistance welded part can be increased without making the joint larger than conventional joints, which prevents accidents such as cracks occurring in the brazed part due to heat shock caused by the high temperatures that occur during resistance welding. It has the effect of preventing

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing a first embodiment of the invention, FIG. 2 is a longitudinal side view showing a second embodiment of the invention, and FIG.
The figure is a vertical side view showing the third embodiment, and FIG.
3... Gaito nogib (tube member), 11... Dimensions, 12... Insertion part, 13... Electrode receiving part.

Claims (2)

[Claims] (1) An iron joint consisting of an insertion part that is inserted into a through hole formed in the compressor case and an electrode receiving part that has a larger diameter than the through hole, and is fitted and joined to the inner circumference of this joint. A method for joining pipe members for a compressor, characterized in that the pipe members are joined in advance by brazing at the tip of the insertion part of the joint, and these are joined to the case by resistance welding. (2) The method for joining pipe members of a compressor according to claim 1, wherein the joint diameter of the brazed portion is smaller than that of the electrode receiving portion of resistance welding.