A rotary compressor

Abstract

The invention relates to the field of compressors, in particular to a rotor-type compressor. The compressor comprises an upper supporting assembly and an upper supporting bearing, the upper supportingbearing and the end, penetrating out of a rotor, of a crankshaft are coaxially arranged and are in clearance fit, and the fit clearance S of clearance fit falls into the range of D2 / 1000-10 micrometers<=S<=D2 / 1000+140 micrometers and meanwhile is distinguished according to the difference in the rotating speed of a motor in actual use. According to the rotor-type compressor, by selecting the appropriate clearance range between the upper supporting bearing and the crankshaft, the compressor runs more stably, the clearance between a stator and the rotor is more uniform, the vibration of the whole compressor is reduced, the reliability of a main bearing and the upper supporting bearing can be guaranteed, and the service life of the compressor is prolonged while the performance is optimized.

Description

technical field [0001] The invention relates to the field of design and manufacture of compressors, in particular to a rotary compressor. Background technique [0002] In traditional compressors, the crankshaft adopts a single-constrained cantilever structure, which is prone to large deformations. Especially in large-displacement rotary compressors, the length of the crankshaft increases, the force on the eccentric part increases, and the shaft of the motor starts As the electromagnetic force increases, the above factors all lead to an increase in crankshaft deflection. The increase in crankshaft deflection will bring many adverse consequences, such as the loss caused by the increase of friction between the crankshaft and the bearing, the noise caused by the increased vibration of the shell, and the increase in the unevenness of the rotor gap, which will lead to a decrease in the efficiency of the motor. [0003] In recent years, a double support structure has been introduc...

AI Technical Summary

Problems solved by technology

Normally, in the upper support structure of the compressor, the bearing and the crankshaft are fixed by a clearance fit, but for different types of compressors, the clearance of the clearance fit is uniformly set, and this rough installation method is difficult to meet different types of compression. Different needs of machines

[0004] For low-speed compressors, such as fixed-speed machines and low-speed frequency converters, if the matching clearance is too large, it is very easy to make it difficult to improve the shaft bearing, thereby reducing the stability and reliability of the compressor; For a compressor running at high speed, if the fitting clearance design is too small, the force on the upper support will increase, and the degree of wear will increase accordingly, which will shorten the life of the upper support and affect the life of the whole machine

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