JPH0331583A - Closed motor compressor - Google Patents

Abstract

PURPOSE: To improve the efficiency of a compressor by disposing a radial bearing cooperating with a vertical shaft which is fixed to the rotor of a motor, and pistons in a cylinder are continuously mounted through a connecting rod, so as to be in proximity to a motor. CONSTITUTION: This hermetic compressor includes an electric motor 12 disposed in the upper part of an internal shell 11, and a compressor block 13 disposed in the lower part of the shell, and this block 13 is springlily-lifted by a spring 14 in the shell 11. A piston 17 is included in the cylinder 15 of the block 13, and this piston 17 is reciprocated by the rotation of a vertical shaft 19 fixed to the rotor 20 of the motor 12 through a connecting rod 18. The vertical shaft 19 is supported in a bearing 21 fixed to the block 13, and, in the bearing 21, a radial bearing 22 cooperating with the vertical shaft 19 is fixed in proximity to the motor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic motor compressor that includes a reciprocating and vertically extending shaft.

Domestic refrigerators and freezers are equipped with small hermetic compressors, most of which are of the vertical shaft type. Increasing the efficiency of compressors requires improving the passage of gas through the various internal elements; further increasing the efficiency of electric motors and other components requires improving the passage of gas through the various internal elements. It is necessary to reduce the acting friction.

In a reciprocating compressor that has an electric motor placed above a link mechanism, one in which a ring forming a shoulder is inserted between the upper side of the bearing and the lower side of the rotor is known. This ring can reduce backlash that occurs between the fixed rotor and the bearing of the shaft during operation of the rotor. However, such a solution involves considerable friction which reduces the efficiency of the compressor.

It is known in the art to use radial ball bearings instead of steel washers between the upper fixed part of the bearing and the rotor. Such solutions either reduce friction or do not significantly increase the efficiency of the compressor.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome the above-mentioned drawbacks. The technical problem to be solved lies in the connection between the shaft and the bearing, as well as in the production of a low-friction, low-noise rotor at low cost.

In order to solve these technical problems, in the compressor of the present invention, a radial bearing is used which cooperates with the shaft to support a small axial load and change the friction of the entire shaft from sliding friction to rotational friction. It is characterized by being placed close to the motor.

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a hermetic compressor 10 of the reciprocating type with a vertically extending shaft has a casing or shell 11 which is connected to an electric motor 12 arranged in the upper part. and a compressor blower 13 arranged in the lower part and fixed to the electric motor.

The block I3 is resiliently lifted within the shell 11 by a spring 14. A cylinder 15 closed by a head 16 is formed by a block 13. In the cylinder cylinder 5, the piston 17 is
Connecting rod 18 driven by vertical shaft 19
Perform reciprocating motion through. The vertical shaft 19 is fixed to the rotor 20 of the motor 12 and supported in a bearing 21 fixed to the block 13. Within the bearing 21, a radial ball bearing 22 cooperating with the vertical shirt [9] is fixed close to the motor 12. A ring 23 forming a shoulder is arranged between the bearing 22 and the rotor 20.

The ball bearing 22, which constitutes a radial bearing rather than an axial bearing, changes the friction caused by the radial repulsion of the vertical shaft 19 from sliding friction to rotational friction. The radial bearing 22 can evenly support the limited axial load, and since this axial load is the load supported by the rotor 20, the radial bearing 22 can evenly support the axial load on the rotor 20. To support.

A duct 24 for supplying lubricating oil towards the moving elements of the compressor in order to fully achieve smooth operation of the moving elements.
The vertical shaft 19 is provided with a duct 24 located at the bottom of the shell 11. An opening 25 or duct 24 is provided for supplying lubricating oil toward the bearing 22 when the motor compressor IO is operated.

As mentioned above, the radial ball bearing 22 has two functions. That is, the radial ball bearing can convert the friction caused by the radial rebound of the shaft 19 from sliding friction to rotational friction and support the limited axial load caused by the rotor 20.

Therefore, the influence on the overall efficiency of the motor-compressor is significant, and by using radial ball bearings, a power saving of 5-10% can be achieved compared to the conventional one.

[Brief explanation of drawings]

Figure 2 is a sectional view showing a hermetic motor compressor of the present invention.

Claims (1)

[Claims] 1. A hermetic motor compressor for a refrigerator including a shaft that reciprocates and extends in a vertical direction, the compressor having a block disposed in an upper part and placed in a lower part. A hermetic motor compressor with a fixed electric motor and a bearing fixed to the block and cooperating with the shaft driven by the motor to support small axial loads and to reduce overall shaft friction. A hermetic motor compressor, characterized in that a radial bearing that cooperates with the shaft is disposed close to the motor so as to change sliding friction to rotational friction. 2. The motor compressor according to claim 1, wherein the radial bearing is constructed as a radial ball bearing.