JPS6127596B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a rotary compressor, and in particular, it is possible to assemble a compression element without being affected by thermal deformation of a case during welding, and The present invention relates to a method for manufacturing a rotary compressor with improved workability.

[Technical background of the invention and its problems]

Generally, when manufacturing a rotary compressor, first, a compression element such as a cylinder housing is housed and fixed in a case by press-fitting, etc., a connecting pipe is inserted from outside the case into the refrigerant suction hole bored in the cylinder housing, and then A suction pipe is connected to this connecting pipe. That is, to explain based on the drawing of a conventional rotary compressor shown in FIG. 1, first, a compression element such as a cylinder housing 2 is housed and fixed in a case 1 by press-fitting or the like.
The upper and lower parts of this cylinder housing 2 are the main frame 3.
and is closed by an end plate 4, and a cylinder chamber 5 is formed inside thereof. next,
The connecting pipe 7 is firmly inserted into the refrigerant suction hole 6 formed in the cylinder housing 2 through the case 1 . Next, the connecting tube 7 is brazed to the case 1 with silver solder 8, and further, the connecting tube 7 is
The rotary compressor is manufactured by brazing the suction pipe 10 to the tip of the outer protrusion of the case 1 with silver solder 9.

By the way, when the connecting pipe 7 is brazed to the case 1, the heated portion of the case 1 expands due to heating, resulting in uneven and large thermal deformation. Therefore, the compression element that is already housed and fixed in the case 1 will be subjected to a large deformation force due to the deformation of the case 1, and each part of the compression element will be deformed, resulting in a decrease in compression performance, and The relative positions of the rotor 11 fixed to the compression element and the stator 12 fixed to the inner wall of the case 1 change, and the motor gap S, which is the gap between them, becomes unstable in the circumferential direction. The disadvantage was that the starting load increased due to uniformity. When case 1 is cooled, the amount of deformation becomes smaller than when it is heated, but once the parts of the compression element have been significantly deformed, the deformation does not fully recover, and in particular, the change in relative position between each part is I won't go back to.

In addition, when brazing connecting pipe 7 and case 1, case 1 is originally thicker than connecting pipe 7 and has a larger heat capacity, and the heat of case 1 is absorbed by the compression element fixed to its inner wall. The brazing process takes a long time because it is difficult to warm up, and the connection pipe 7, which has a small heat capacity, is likely to be overheated and melt, resulting in poor workability.

[Purpose of the invention]

The present invention was made based on the above circumstances, and
It is an object of the present invention to provide a method for manufacturing a rotary compressor, in which compression elements can be assembled without being affected by thermal deformation of a case during welding, and welding workability can be improved.

[Summary of the invention]

The present invention includes a first step of welding a guide tube to a case, a second step of storing and fixing a compression element in the case to which the guide tube is welded, and a connecting tube inserted into the guide tube to connect the connecting tube to the case. A method for manufacturing a rotary compressor, comprising a third step of inserting the refrigerant into a refrigerant suction hole of a compression element, and a fourth step of welding the guide pipe and suction pipe to the connecting pipe, and The compression element can be assembled without being affected by thermal deformation, and welding workability can be improved.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings. FIG. 2 is a sectional view of the main parts of a rotary compressor manufactured by the manufacturing method of the present invention.
A compression element consisting of a cylinder housing 2, a main frame 3 that closes the top and bottom of the cylinder housing 2 to form a cylinder chamber 5 inside the case 1, an end plate 4, etc. is housed and fixed in a case 1 by press-fitting or the like. Further, a guide tube 13 is brazed to the case 1 with, for example, silver solder 14, and a connecting tube 15 is inserted through the guide tube 13 into the refrigerant suction hole 6 formed in the cylinder housing 2. ing. Further, an annular ridge 16 is formed near the tip of the connecting pipe 15 that protrudes outside the case 1, and the suction pipe 10 is fitted and connected to the outer periphery of the connecting pipe 15 at the end of the annular ridge 16. At the same time, the suction pipe 10 and the guide pipe 13 are brazed to the connecting pipe 15 with silver solder 18 and 17. Next, a method of manufacturing the rotary compressor will be explained. First, in a first step, the guide tube 13 is brazed to the case 1. Next, in a second step, the cylinder housing 2 is placed inside the case 1 to which the guide tube 13 is brazed.
The compression element consisting of etc. is housed and fixed by press-fitting or the like. Furthermore, in a third step, the connecting pipe 15 is inserted through the guide pipe 13 into the refrigerant suction hole 6 formed in the cylinder housing 2 of the compression element. Next, in a fourth step, a suction pipe 10 is attached to the outer periphery of the tip of the connecting pipe 15 that protrudes outside the case 1.
and connect the guide tube 13 and suction tube 10 to the connecting tube 15 simultaneously or separately by brazing.

In the above manufacturing process, the heated portion of the case 1 expands due to heating during brazing in the first step, resulting in non-uniform and large thermal deformation. However, the second
When storing and fixing the compression element in the case 1 in the step of step 1, the case 1 is cooled and the amount of deformation described above is reduced, so the force that the compression element receives is small.
The parts of the compression element do not deform or the relative positions between the parts change. If the amount of deformation of the case 1 is large even after cooling, it may be corrected by reshaping the case 1 with a press or reheating the entire case to a high temperature to remove distortion, or By modifying the shape of the compression element according to the deformation of the case, it is possible to prevent the compression element from receiving a large deformation force in advance. Further, since the brazing between the connecting pipe 15 and the guide pipe 13 in the fourth step is performed at a position away from the case 1, the case 1 is not adversely affected.

Furthermore, when brazing work is performed in the first step, since the compression element is not housed and fixed in the case 1, the heat of the case 1 is not taken away by the compression element and the case 1 is easily heated. The brazing work time can be shortened, and therefore the brazing workability can be improved, such as being able to prevent overheating of the guide tube 13.

〔Effect of the invention〕

As explained above, in the present invention, the guide tube is welded to the case before storing and fixing the compression element in the case, and the guide tube and the connecting tube are welded, so that the compression element can be It can be stored in a small case after cooling, and if the amount of deformation mentioned above is large, the case or compression element can be modified in advance, so it will not be affected by large thermal deformation of the case during welding. The compression element can be assembled without any need for assembly. Therefore, it is possible to prevent a reduction in compression performance due to deformation of each component of the compression element and an increase in starting load due to non-uniformity of the motor gap.

Furthermore, since the case heats up easily, welding work time can be shortened, and therefore welding workability can be improved, such as being able to prevent overheating of the guide tube.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a rotary compressor manufactured by a conventional manufacturing method, and FIG. 2 is a vertical sectional view of a main part of a rotary compressor manufactured by the manufacturing method of the present invention. This is what is shown. 1...Case, 2...Cylinder housing, 6
... Refrigerant suction hole, 10 ... Suction pipe, 13 ... Guide pipe, 7, 15 ... Connection pipe.

Claims (1)

[Claims] 1. A first step of welding a guide tube to the case, a second step of storing and fixing the compression element in the case to which the guide tube is welded, and inserting the guide tube and connecting the connecting tube to the compression element. A method for manufacturing a rotary compressor, comprising a third step of inserting the refrigerant into a refrigerant suction hole, and a fourth step of welding the guide pipe and the suction pipe to the connecting pipe.