JP3301864B2 - Manufacturing method of rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotary compressor mounted on, for example, a home refrigerator, and more particularly, to a method for manufacturing a rotary compressor.
By devising assembling and fixing means by a tack welding process of a cylinder member of a compression element driven by an electric element into a cylindrical case forming a closed container, the cylinder member is stably assembled, The present invention is designed to reduce poor starting and noise during operation due to the suction force of the electric element.

[0002]

2. Description of the Related Art Conventionally, in a method of manufacturing a rotary compressor of this kind, as shown in FIGS. 2 and 3, a stator b and a rotor c are placed in a cylindrical case a forming a closed container. When a cylinder member d on which a piston (not shown) of a compression element driven by an electric element is mounted and fixed, three welding points A,
This is performed by tack welding at B and C.

[0003] Such a welding step is performed by a method of sequentially performing tack welding one point at a time along the circumferential direction of the case a or simultaneously performing three points.

[0004]

However, in the process of welding the cylinder member d into the case a in the conventional rotary compressor described above, three welding points A, B,
Since the height positions of C are all on the PP line of the same height, when tack welding is performed sequentially one point at a time, the pushing force F acts on the cylinder member d each time, and the cylinder member d It is easy to assemble in an unstable state by moving or tilting in the case a.

[0005] In addition, when tack welding is performed simultaneously at three points, for example, in a crow-shaped cylinder member d which has recently been mainly used, the pushing force F during tack welding is restricted because the tack welding position is restricted. The resultant force F ′ acts in a specific direction, and the cylinder member d moves or tilts in the case a.

[0006] Such displacement due to the movement or inclination of the cylinder member d during assembly causes a displacement of the rotation center axis OO of the electric element, and an air gap between the stator b and the rotor c. Since G is unbalanced, it is not possible to sufficiently secure the air gap of the electric element, so that the starting force due to the suction force of the electric element and the noise during operation are likely to increase.

Therefore, conventionally, as a means for preventing the cylinder member d from moving or tilting during assembly, the welding start time of the first welding point A corresponding to the vertex of an isosceles triangle connecting three welding points is conventionally known. To the other two second and third welding points B and C
A tack welding method in which a time difference is provided so as to perform the welding earlier is employed, but there is a problem that tack welding by the time difference causes a new time loss in a manufacturing process.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate a time loss in a manufacturing process, and to displace a rotation center shaft with respect to an electric element which is generated in an unstable mounting state due to movement or inclination of a cylinder member during mounting. To provide a method of manufacturing a rotary compressor capable of reducing the start-up failure and the noise during operation due to the attraction force of the electric element by preventing the electric element and ensuring the air gap of the electric element. It is in.

[0009]

In order to solve the above-mentioned problems, the present invention combines an electric element and a compression element driven by the electric element in a cylindrical case forming a closed container. A method for manufacturing a rotary compressor, wherein the cylinder member of the compression element is housed and fixed in the case from outside by a tack welding process, and the welding process is simultaneously performed from three welding points in a circumferential direction. , Wherein the height of a first welding point corresponding to a vertex of an isosceles triangle connecting the three welding points is higher than the heights of the other two second and third welding points. It is characterized by. Further, for the height of the first welding point, set the height of the other of the second and third weld points of about 5mm about 15mm lower
Is obtained is characterized in that the.

[0010]

According to the present invention, by adopting the above structure, the cylinder member of the compression element driven by the electric element is simultaneously placed at three welding points in the circumferential direction from the outside in the cylindrical case. While fixing in the tack welding process,
The first equivalent to the vertex of an isosceles triangle connecting the three welding points
Second and the third welding point height the height of the welding point of the other two points
As described above, the unbalance amount of the air gap of the electric element due to the displacement of the cylinder member when tack welding is performed at three points at the same time as before, the displacement of the air gap of the electric element due to the inclination of the cylinder member. Thus, the air gap of the electric element is secured, so that the starting failure due to the suction force of the electric element and the noise during operation can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawing shown in FIG. 1. As shown in FIG. 1, reference numeral 1 in FIG. 1 forms a closed container in a compressor according to the present invention. It is a cylindrical case.

In the case 1, a stator 3 and a rotor 4 constituting the electric element 2 and a compression element 5 driven by the electric element 2 are assembled and housed.
It has a cylinder member 6 to which a piston (not shown) is attached.

The cylinder member 6 is fixed to the inside of the case 1 from outside by a tack welding process. The welding process includes three points in a circumferential direction as shown in FIG. At the same time at welding points A, B and C of the first welding point A corresponding to the vertices of an isosceles triangle connecting the three welding points A, B and C. Above the height position P2 of the second and third welding points B and C, and the height range T of the second and third welding points B and C is higher than the height position P1 of the first welding point A. No. 3 has a configuration in which the height position P2 of the welding points B and C is set to be as low as about 5 mm to about 15 mm.

That is, the present invention considers in advance the amount of change in the air gap G of the electric element 2 that occurs when the cylinder member 6 is welded.
Height position P1 of welding point A and second and third welding points B,
By setting the height position P2 of C, the unbalance amount of the air gap G of the electric element due to the displacement of the cylinder member 6 is offset by the displacement amount of the air gap G of the electric element 2 due to the inclination of the cylinder member 6. It is.

[0015]

As is apparent from the above description, according to the present invention, the cylinder member of the compression element driven by the electric element is simultaneously placed at three welding points in the circumferential direction from the outside in the cylindrical case. Since it is fixed in the tack welding process, time loss in the manufacturing process can be eliminated.

In addition, the height of the first welding point corresponding to the vertex of an isosceles triangle connecting the three welding points is set to the second of the other two points.
And higher than the height of the third welding point,
As before, the unbalance amount of the air gap of the electric element due to the displacement of the cylinder member when tack welding at three points simultaneously can be offset by the displacement amount of the air gap of the electric element due to the inclination of the cylinder member. The air gap of the electric element can be ensured, whereby the starting failure due to the attraction force of the electric element and the noise during operation can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a main part showing an embodiment of tack welding of a cylinder member of a compression element driven by an electric element in a rotary compressor according to the present invention into a case.

FIG. 2 is a schematic vertical sectional side view of a main part of a conventional rotary compressor in a state where a cylinder member of a compression element driven by an electric element is tack-welded into a case.

FIG. 3 is a schematic cross-sectional view of a main part showing a state in which a conventional cylinder member is tack-welded into a conventional case.

[Explanation of symbols]

1 ... case, 2 ... electric element, 5 ... compression element, 6 ... cylinder member, A, B, C ... tack welding point, G ... air gap, P1 ... The height position of the first tack welding point A, P2: the height position of the second and third tack welding points B, C, T: the height range of the height position of the tack welding points.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hitomi Takagi 2-5-1-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-60-101290 (JP, A) JP-A-64-41692 (JP, A) JP-A-59-108882 (JP, A) JP-A-2-64783 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 29 / 00 F04C 18/356

Claims (2)

(57) [Claims] An electric element and a compression element driven by the electric element are assembled and housed in a cylindrical case forming a closed container, and a cylinder member of the compression element is inserted into the case from outside. In a method for manufacturing a rotary compressor, which is fixed in a tack welding process and the welding process is performed simultaneously from three welding points in a circumferential direction, the method corresponds to a vertex of an isosceles triangle connecting the three welding points. A height of the first welding point to be formed is made higher than heights of the second and third welding points of the other two points. Wherein for the height of the first welding point, the other second
And lower the height of the third welding point from about 5 mm to about 15 mm
The method for manufacturing a rotary compressor according to claim 1, wherein the setting is set .