KR980009916A - Hermetic compressor - Google Patents

Abstract

The present invention relates to a hermetic compressor having a rotary shaft integrally fixed to a rotor rotatably installed in a stator and a bearing provided in connection with the rotor and rotatably supporting a journal portion of the rotary shaft, An elastic buffering means is interposed between the rotor and the bearing. This reduces the friction and wear of the upper end surface of the bearing by attenuating the weight and axial load of the rotor, thereby improving the service life and performance of the compressor.

Description

Hermetic compressor

The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor having a buffer means interposed between a rotor and a bearing.

4 is a cross-sectional view of a conventional compressor. As shown in this figure, a cylindrical stator 104 in which a coil 106 is wound is fixedly installed in a casing 102 of a compressor. Inside the stator 104, a rotor 108 is rotatable Respectively. The rotary shaft 110 is press-fitted into the rotor 108 to rotate integrally with the rotor 108.

A bearing 112 is provided under the rotor 108 to rotate and support the journal portion of the rotary shaft 110. A crank shaft 114 is connected to the lower end of the rotary shaft 110. [ The crankshaft 114 rotates by the rotation of the rotor 108 and the rotary shaft 110 and is connected to the piston 118 through the connecting rod 116 to rotate the rotor 108 and the rotary shaft 110. [ To the reciprocating linear motion of the piston (118).

The upper end of the bearing 112 which rotatably supports the rotary shaft 110 is rotatably supported by the rotor 108 when the rotary shaft 110 pressed into the rotor 108 rotates together with the rotor 108 during operation of the compressor, The upper end portion of the bearing 112 is intensively worn due to the weight of the rotor 108 and the thrust in the axial direction that occurs when the rotor 108 is rotated. Especially during initial starting of the compressor, the axial load is concentrated and the wear is increased. Thus, a washer 120 is provided between the lower portion of the rotor 108 and the upper end of the bearing 112.

However, since the washer 120 mounted between the lower portion of the rotor 108 and the upper end of the bearing 112 rotates together with the rotation of the rotor 108 and rubs against the upper end of the bearing 112, And thus it does not play a sufficient role in preventing friction and abrasion. Particularly, in a compressor of a large capacity, wear of the upper end portion of the bearing 112 is serious, resulting in deterioration of the service life and performance of the compressor.

Accordingly, it is an object of the present invention to provide a hermetic compressor capable of improving the service life and performance of a compressor by reducing abrasion of bearings by attenuating axial load through a buffer means between the lower portion of the rotor and the upper end of the bearing .

1 is a sectional view of a compressor according to the present invention;

Figure 2 is a partial enlarged cross-sectional view of the area between the rotor and the bearing;

FIG. 3 is an enlarged cross-sectional view of the buffer member. FIG.

4 is a cross-sectional view of a conventional compressor.

DESCRIPTION OF THE REFERENCE NUMERALS

2: stator 6: rotor

8: rotating shaft 10: bearing

12: buffer member 14: compression spring

16: housing 18:

20: Groove

According to the present invention, there is provided a hermetic compressor including a rotary shaft integrally fixed to a rotor rotatably installed in a stator, and a bearing provided in connection with the rotor and rotatably supporting the journal portion of the rotary shaft, And an elastic buffering means is interposed between the rotor and the bearing.

Here, the buffering means may be constituted by a compression spring in the form of a ring, and the compression spring is preferably accommodated in a housing which can be expanded and contracted along the axial direction.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a compressor according to the present invention, and FIG. 2 is a partially enlarged cross-sectional view of a region between a rotor and a bearing. As shown in these drawings, the stator 2 is fixed in a casing 4. A rotary shaft 8 is press-fitted into a rotor 6 rotatably accommodated in the stator 2, As shown in Fig. The rotary shaft 8 is rotatably supported by the bearing 10 provided in the lower region.

A buffer member (12) is mounted between the rotor (6) and the bearing (10). The buffer member 12 is composed of a compression spring 14 and a housing 16 for housing the compression spring 14.

3 is an enlarged cross-sectional view of the buffer member. As shown in this figure, the housing 16, which surrounds the rotating shaft 8 in a ring shape, is formed as a hollow body, and also a ring-shaped compression spring 14 is incorporated therein. Both side portions of the housing 16 are made of a wrinkled flexible material and are deformable along the axis of the rotation shaft 8. Accordingly, when vibration or thrust is applied in the axial direction due to the rotation of the rotor 6, the compression spring 14 inside the housing 16 expands and contracts, so that vibration and axial force can be attenuated. The upper and lower surfaces of the housing 16 are formed to have sufficient stiffness and abrasion resistance to provide adequate resistance to the weight and axial load and relative friction of the rotor 6.

On the other hand, on the upper end surface of the bearing 10, a ring-shaped groove 18 capable of receiving the protrusion 18 of the housing 16 is formed in the bottom surface portion of the housing 16, (20) are formed. The protrusions 18 and the grooves 20 formed in this manner spread the contact area between the bottom surface of the housing 16 and the upper end of the bearing 10 to disperse the load and vibration. Here, the protrusion 18 of the bottom face of the housing 16 and the groove 20 of the upper end surface of the bearing 10 may be reversed.

With the above configuration, when the rotor 6 and the rotary shaft 8 are rotated, the axial load generated by the self weight and the thrust of the rotor 6 at the time of the initial startup is applied to the buffer member 12 do. The cushioning member 12, which has been subjected to the load, shrinks as the compression spring 14 in the housing 16 shrinks, thereby buffering and damping the axial load and transmitting it to the upper end surface of the bearing 10. As a result, a much more relaxed axial load is applied to the upper end surface of the bearing 10, so that even when relative friction occurs, the load is effectively dispersed because it is in mutual contact.

As described above, in the compressor of the present invention, a buffer member composed of a compression spring and a casing is mounted between the lower portion of the rotor and the upper end of the bearing to attenuate the weight and the axial load of the rotor, By reducing friction and abrasion, the life and performance of the compressor can be improved.

Claims (4)

A hermetic compressor comprising: a rotary shaft integrally fixed to a rotor rotatably installed in a stator; and a bearing installed in connection with the rotor and rotatably supporting a journal portion of the rotary shaft, the hermetic compressor comprising: And a buffer means is interposed between the compressor and the hermetic compressor. The hermetic compressor according to claim 1, wherein the buffer means is a compression spring in the form of a ring. The hermetic compressor according to claim 2, wherein the compression spring is housed in a casing capable of expanding and contracting along the axial direction. The hermetic compressor according to claim 3, wherein the contact surface between the casing and the bearing is provided with a circumferential groove formed on one side of the contact surface and a protrusion formed on the contact surface of the other side to be accommodated in the groove. ※ Note: It is disclosed by the contents of the first application.