JP2553747B2 - Rotary compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for a refrigerator or the like.

2. Description of the Related Art In recent years, compressors used in refrigerating machines and the like have been shifting from reciprocating type to rotating type in terms of energy saving and space saving. In particular, there has been a demand for ultra compactness from the viewpoint of space saving.

Therefore, as a conventional technique for reducing the size of the rotary compressor, for example, as shown in Japanese Patent Laid-Open No. 62-58092, a two-sided support consisting of a commonly used auxiliary bearing and a main bearing is used. A cantilever bearing structure has been devised in which auxiliary bearings are eliminated from the bearing structure.

Hereinafter, an example of the above-described conventional rotary compressor will be described with reference to the drawings.

FIG. 3 and FIG. 4 are vertical sectional views of a conventional rotary compressor and
FIG. 11 is a sectional view taken along line II-II ′. In the figure, 1 is a closed container,
The electric motor unit 2 and the compression element unit 3 are housed. Motor part 2
Is composed of a stator 2a and a rotor 2b, and a compression element portion 3 including a cylinder 5, a roller 6, a vane 7, a main bearing 8, a cylinder cover 9 and a compression chamber 10 via a shaft 4. Connected with. The main bearing 8 has a valve accommodating recess 12 accommodating a discharge valve 11, and is welded and fixed to the hermetically sealed container 1 by means of four welded portions 13 whose outer peripheral portion is divided at equal intervals of 90 °. A discharge cover 14 is press-fitted and fixed to the main bearing 8. Reference numeral 15 is a lubricating oil stored at the bottom of the closed container 1, and 16 and 17 are a suction pipe and a discharge pipe.

The operation of the rotary compressor configured as described above will be described below.

Refrigerant gas from an external cooling system (not shown) is introduced from the suction pipe 16 to reach the compression chamber 10 of the compression element section 3 and is gradually compressed by the compression operation of the compression element section 3 accompanying the rotation of the electric motor section 2. . The compressed refrigerant gas is once discharged from the discharge valve 11 through the discharge cover 14 into the closed container 1,
It is discharged from the discharge pipe 17 to an external cooling system (not shown). Further, the lubricating oil 15 is supplied to the compression element portion 3 by an appropriate oil supply means.
To be refueled.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional structure, the main bearing 8 is accommodated in the valve because the outer peripheral portion is welded and fixed to the closed container 1 by the four welded portions 13 divided at equal intervals. The welded portion 13 is provided in a portion near the recess 12 where the rigidity is weak. For this reason, the sealed container 1 is deformed by the heat energy during welding, and when the main bearing 8 is pressed in the axial direction, a large stress acts on the main bearing 8 in the vicinity of the valve housing portion 12, and the main bearing 8 is largely distorted. I will end up. Therefore, there is a problem that twisting or locking occurs due to the influence of the distortion of the main bearing 8 during the compression operation of the compression element portion 8.

In view of the above problems, the present invention provides a compact and high-performance rotary compressor that minimizes distortion of the main bearing that occurs during welding of the main bearing and the hermetically sealed container, and does not cause prying or locking. is there.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention is
A main bearing having a valve accommodating recess is fixed by welding its outer periphery to a hermetically sealed container at intervals of approximately 120 °, and the valve accommodating recess is provided substantially at the center of two welded portions.

Effect of the Invention According to the present invention, due to the above-described structure, deformation of the hermetic container due to thermal energy generated during welding of the main bearing and the hermetic container presses the main bearing in the axial direction at three locations avoiding the recessed portion of the valve housing of the main bearing. As described above, the stress acting on the main bearing is balanced in a place where the rigidity is high, and the strain generated in the main bearing can be minimized.

Examples Hereinafter, one example of the rotary compressor of the present invention will be described with reference to the drawings. In order to avoid duplication of description, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

1 and 2 are a longitudinal sectional view and an II 'sectional view of a rotary compressor of the present invention.

The basic structure and operation of the compressor are the same as those of the conventional one, but the outer peripheral portion of the main bearing 8 is welded and fixed to the hermetically sealed container 1 at three welded portions 18 divided into approximately 120 ° intervals. The main bearing 8 is provided with a valve accommodating recess 12 located substantially at the center of the two welds 18, 18.

The operation of the rotary compressor configured as described above will be described below.

Due to the thermal energy generated during the welding of the main bearing 8 and the hermetically sealed container 1, the hermetically sealed container 1 is deformed at the three locations of the welded portion 18 and presses the main bearing 8 in the axial direction. At this time, the valve housing recess 12 avoids the welded portion 18 and the welded portions 18
Since it is formed in the middle of 8, the rigidity does not decrease with respect to the thermal stress acting on the welded portions 18, 18 in the axial direction. Therefore, the stresses in the three directions acting on the welded parts 18, 18, 18 at 120 ° intervals are balanced, and the strain generated in the main bearing 8 can be minimized and equalized. Thereby, the rotary compression element portion 3
It is possible to suppress and reduce twisting and locking that occur during the compression operation of the. Further, sliding between the end surface of the main bearing 8 and the roller 6 can be improved.

Effects of the Invention As described above, the present invention comprises a hermetically sealed container, a motor portion housed in the hermetically sealed container, and a compression element portion having a main bearing with a valve accommodating recess. The outer periphery of the main bearing is fixed by welding at an interval of about 120 ° to the hermetically sealed container, and the valve housing recess is provided substantially at the center of the two welded portions. The distortion of can be minimized. This reduces and reduces twisting and locking of the main bearing and shaft,
In addition, since even minute distortions are equalized, sliding of the main bearing end surface and the rollers can be improved, and a compact and high-performance rotary compressor can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line I-I 'of the same compressor, and FIG. 3 is a vertical sectional view of a conventional rotary compressor. Fig. 4 and Fig. 4 show the compressor II
FIG. 11 is a cross-sectional view taken along the line II ′. 1 ... airtight container, 2 ... electric motor part, 3 ... compression element part,
8 …… Main bearing, 12 …… Valve housing recess, 18 …… Welding part.

Claims (1)

(57) [Claims] 1. A main bearing comprising a hermetically sealed container, an electric motor section and a rotary compression element section housed in the hermetically sealed vessel, wherein the main bearing constituting the rotary compression element section is provided with a valve accommodating recess. The bearing is fixed by welding the outer periphery of the bearing to a closed container at intervals of approximately 120 °, and the valve accommodating recess is provided at approximately the center of two welds.