Compressor

Abstract

The invention provides a compressor. The compressor comprises a shell; a motor and a cylinder, which are accommodated in the shell; a crankshaft, which comprises a long shaft part, an eccentric part and a short shaft part and is used for transmitting the rotary force of the motor to the cylinder to compress a refrigerant; and a first bearing assembly and a second bearing assembly, which define a compression space together with the cylinder and are used for supporting the crankshaft, wherein the first bearing assembly comprises a main bearing and a bush, the main bearing is located between the motor and the cylinder and provided with a through hole, and the bush is arranged in the through hole in a matching way and provided with an inner hole for supporting the crankshaft, which enables the bush to sleeve the long shaft part of the crankshaft. The compressor provided by the invention can meet requirements on wearing of a friction pair composed of the main bearing and the crankshaft and requirements on welding of the bearing and upper and lower shell covers, and reduces processing difficulty of conventional bearings at the same time.

Description

technical field [0001] The invention relates to a compressor, in particular to a fully enclosed rolling rotor compressor. Background technique [0002] In general, a hermetic compressor includes a motor for generating a driving force in an inner space of a hermetically sealed case, and a compression part coupled to the motor for compressing refrigerant. Hermetic compressors can be classified into reciprocating compressors, scroll compressors, and rolling rotor compressors according to different refrigerant compression mechanisms. Reciprocating compressors, scroll compressors, and rolling rotor compressors all utilize the rotational force of an electric motor. [0003] The motor of the existing hermetic compressor utilizing rotational force has a crankshaft, and the rotational force of the motor is transmitted to the compression part through the crankshaft. figure 1 Shown is a structural schematic diagram of a rolling rotor compressor in the prior art. As shown in the figu...

AI Technical Summary

Problems solved by technology

The crankshaft 31' is relatively thin, resulting in an increase in the surface pressure of the upper bearing 4', local working conditions are relatively harsh, and wear is serious

In addition, in the case of improper welding of the upper bearing 4' and the sealed casing 2', the axis of the crankshaft 31' may be inclined, and even a small inclination angle may cause wear to concentrate between the upper bearing 4' and the crankshaft 31'

[0009] (2) The welding of the sealed casing 2' and the upper cover 1' and the lower cover 7' may easily cause the deformation of the sealed casing 2'

Specifically, since the sealed casing 2' is generally a cylindrical structure, it is easily deformed when it is welded to the upper cover 1' and the lower cover 7', thus not only affecting the overall airtightness of the compressor, but also Moreover, the gap between the rotor and the stator of the motor is uneven, which affects the overall coaxiality of the motor and the crankshaft, bearings, cylinders, etc., and reduces the working efficiency and performance of the compressor.

[0010] (3) The gap between the inner rotor 32' and the outer stator 33' is poor

Specifically, the rolling rotor compressors in the prior art have been unable to fundamentally eliminate the problem of bad clearance between the stator and rotor due to the influence of the machining accuracy of the parts and the positioning reference of the stator and rotor

Since the upper bearing 4' is installed in the sealed casing 2', the coaxiality between the bearing surface of the upper bearing 4' itself and the inner wall of the sealed casing 2' is difficult to ensure, and the processing of the upper bearing 4' is extremely difficult.

The outer stator 33' is positioned based on the sealed casing 2'; the inner rotor 32' is positioned based on the crankshaft 31', and the crankshaft 31' is positioned based on the upper bearing 4', so when the upper bearing 4' and the sealed casing 2' are simultaneously When the axiality is not up to standard, the gap between the inner rotor 32' and the outer stator 33' will become very poor, and even cause wear between the inner rotor 32' and the outer stator 33', shorten the service life of the motor, and cause make a lot of noise

Images