JPS63183773A - Structure for connecting shell of refrigerant compressor or the like with feeding pipe - Google Patents

Abstract

PURPOSE:To form a junction part which is excellent in joining strength, vibration-proof, and thermal stress resistance, by thickening the junction part of a copper pipe, and also, enlarging its outside diameter, at the time of welding a copper pipe for supplying gaseous refrigerant to the copper shell of a refrigerant compressor, etc., by a copper series brazing filler metal. CONSTITUTION:A copper pipe 2a for supplying fluid such as gaseous refrigerant, etc., to a steel shell 1 in the refrigerant compressor is brought to brazing welding by using the copper series brazing filler metal. In this case, a part 5 where the copper pipe 2a is fitted and stuck to the shell is thickened by enlarging the outside diameter, or the junction part 5 of a copper pipe 2b is thickened by making the inside diameter small, and also, the junction part 7 of a copper pipe 2c is thickened by expanding the diameter successively in the radial direction from other part. This thickened part is fitted to the steel shell and brought to brazing welding by the copper series brazing filler metal, by which joining strength after welding becomes large, and the junction part which is excellent in vibration-proof and thermal stress resistance is obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention connects a pipe for supplying fluid such as refrigerant gas to a steel shell that constitutes the outer shell of a refrigerant compressor, etc. The present invention relates to a connection structure between a shell of a refrigerant compressor, etc., and a feed pipe, which ensures sufficient strength after connection.

(Prior Art) A refrigerant compressor of an air conditioner, a refrigerator, or the like is generally connected to a copper feed pipe that has good corrosion resistance and flexibility.

Conventionally, limited soldering was used as a method of fixing the feed pipe that sends the refrigerant to be compressed into the shell of the refrigerant compressor or discharges the compressed refrigerant, but silver soldering is expensive and requires manual labor. For two reasons, as shown in Fig. 6, the copper wire a is fed to the welding part, that is, the fitting connection part between the shell C and the feed pipe d, using an automatic feeding device ab. It was configured to perform automatic welding. (MIG brazing welding) (Problem to be solved by the invention) However, although it has become possible to perform HB at a low cost by using copper wire (used as wax), the feed pipe and wire are made of the same material. As a result, as shown in Figure 7, the solder penetration (into the figure) becomes large, and as a result, the welded part has sufficient connection strength to withstand stress concentration, vibration, and thermal load after welding. There are difficulties in maintaining this.

[Structure of the Invention] (Means for Solving the Problems) This invention aims to solve the above-mentioned problems. In a connection structure between a shell and a feed pipe in which a copper feed pipe is fitted and connected, the fitting connection portion of the feed pipe to the shell is brazed welded with a copper-based solder, and the feed pipe is The connection structure between the shell of the refrigerant compressor shade and the feed pipe is constructed by forming the fitting connection portion of the feed pipe thicker than other portions in advance.

(Function) The wall thickness of the copper feed pipe that feeds fluid such as refrigerant gas that is connected to the shell of a refrigerant compressor, etc. should be adjusted in advance so that the fitting connection part with the shell is thicker than other parts. , and the fitting connection between the shell and the feed pipe is brazed welded with copper solder, so welding penetration will occur at the fit connection of the feed pipe. This melt penetration depth can be made shallower than the outer circumferential surface of the other portion of the feed pipe. That is, a sufficient wall thickness after welding can be ensured. As a result, the strength of the fitting connection portion is guaranteed, and vibration resistance and heat stress resistance performance are improved.

(Embodiment) A preferred embodiment of a connection structure between a refrigerant compression shell and a feed pipe according to the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 shown in FIG. 1 is a part of a shell forming the outer shell of a refrigerant compressor, and is a suction part for fluid such as refrigerant to be compressed.

This shell and the suction part 1 are made of steel. Feed pipes 2a...C formed as shown in FIGS. 3 to 5 are fitted into and fixed to this suction portion 1. As shown in FIG.

The feed pipe 2a, not shown in FIG. 3, has a fitting connection portion 3 for the suction portion 1 formed to have a larger outer diameter than the other portion 4, and is thick. The degree of this thick wall is determined so that when brazing welding is performed using copper-based solder, the penetration depth of the copper-based solder becomes shallower than the outer circumferential surface 4a of the other portion 4 of the feed pipe 2a. . In addition, the connecting portion between the feed pipe 2a and the other part 4 has an appropriate curvature R to avoid stress concentration.
are connected continuously.

The feed pipe 2b shown in FIG. 4 is an example in which the inner diameter of the portion 5 that is fitted and connected to the suction portion 1 is formed to be small and thick.

In order to avoid stress concentration, the feed via 2c shown in FIG. An example in which the diameter is gradually expanded toward the fitting connection portion 7 side to form a C is shown. This improves not only stress concentration but also weight efficiency with respect to the strength of the feed pipe 2C.

Next, the feed pipes 2a and 2b shown in FIGS.
, 2c and the suction part 1 will be explained by taking the feed pipe 2a shown in FIG. 3 as an example.

Fig. 2 shows the system of the MIG brazing welding device, in which 8 is an automatic feeder, 9 is a welding current supply device (pulse type), 10 is a welding torch, and 12 is a copper-based wire A7 ( 1 is a suction part, and 2a is a feeding pipe. Further, arrow B indicates shielding gas.

As shown in the figure, when MIG brazing welding is performed by automatically rotating the suction part 1 that is a part of the shell, supplying pulse current to the welding torch 10, and automatically feeding out the wire (wax) 12, the first Welding quality as shown in the figure J can be obtained.

That is, the melting depth of the wire (brazing) is equal to that of the feeding pipe 2a.
The fitting connection part 3 is shallower than the outer circumferential surface 4a of the other part 4, and there is no penetration into the suction part 1. This is because the suction part 1 is made of steel and its melting temperature is about 1500°C, whereas the melting temperature of the copper wire is about 1000°C, and good brazing welding quality can be obtained.

[Effects of the Invention] As is clear from the above explanation, the present invention exhibits the following excellent effects.

(1) The connection strength between the shell and the feed pipe is due to thermal stress,
It can be improved against stress concentration and vibration, and can be provided at a low cost.

(2) Work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partial detailed sectional view showing a preferred embodiment of the present invention, FIG. 2 is a system diagram of a MIG brazing welding device,
3 to 5 are cross-sectional views showing embodiments of the feed pipe;
FIGS. 6 and 7 are diagrams showing conventional examples. In the figure, 1 is a suction part, and 2a...C are feeding pipes. Figure 1 Figure 3 Figure 5

Claims (2)

[Claims] (1) In a connection structure between a steel shell of a refrigerant compressor, etc., and a copper feed pipe for feeding a fluid such as refrigerant gas, which is fitted and connected to the shell, the feed pipe is A shell for a refrigerant compressor, etc., characterized in that the fitting connection part with the shell is brazed welded with copper-based solder, and the fitting connection part of the feed pipe is previously formed thicker than other parts. and the connection structure with the feed pipe. (2) A shell of a refrigerant compressor, etc., according to claim 1, wherein the feed pipe is formed in a continuous manner by sequentially expanding the diameter outward in the radial direction from the other part toward the fitting connection part. Connection structure with feed pipe.