Rotary compressors and their rotor assemblies

Abstract

The invention discloses a rotary compressor and a rotor assembly thereof. The rotor assembly includes: a rotor with a shaft hole; an upper balance weight and a lower balance weight respectively arranged on the top and bottom of the rotor, and the upper balance weight and the lower balance weight respectively have shaft holes coaxial with the shaft hole; The first circular hole and the second circular hole, wherein each of the upper balance weight and the lower balance weight includes: an outer cylinder; an inner cylinder, the inner cylinder intersects the outer cylinder and is connected to the outer cylinder The protruding direction is opposite; the upper end surface, the upper end surface is set on the top of the outer cylinder and the inner cylinder; the lower end surface, the lower end surface is set on the bottom of the outer cylinder and the inner cylinder. According to the rotor assembly of the present invention, when used in a rotary compressor, it can reduce the rotational speed fluctuation of the rotary compressor to reduce vibration and noise, and effectively reduce the fluid noise inside the shell of the rotary compressor and improve its mechanical efficiency. Moreover, the production process is simple and the reliability is high.

Description

technical field [0001] The invention relates to the field of rotary compressors, in particular to a rotor assembly of a rotary compressor and a rotary compressor with the same. Background technique [0002] In the compression structure of the existing rotary compressor, in order to balance the eccentric part of the crankshaft in the pump body and the unbalance generated when the piston rotates with the compressor, semi-annular balance weights are generally installed at both ends of the rotor to reduce compression. The purpose of machine vibration and noise. [0003] In the existing rotary compressors, the common method to reduce the vibration of the compressor and reduce the noise of the compressor is to install a balance weight with a suitable quality at the corresponding position of the two ends of the rotor according to the eccentric part of the crankshaft and the unbalance of the piston. As the mass increases, its volume will also increase accordingly. With the high-spe...

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Problems solved by technology

[0005] For the drive torque M of the rotary compressor motor d It is usually constant, but the resistance torque M changes with the rotation angle, so the instantaneous driving torque is not equal to the resistance torque, which will cause the pump body to fluctuate in speed, thus affecting the vibration, noise and reliability of the rotary compressor

In order to reduce the speed fluctuation of the pump body and reduce the tangential vibration of the compressor and the mechanical noise generated by it, the moment of inertia J of the compressor can be increased by increasing the mass of the balance weight, but the mass of the balance weight can be increased to make it larger than its reasonable The value will increase the radial vibration of the rotary compressor and the tangential vibration caused by it, and the volume increase caused by the increase in the mass of the balance weight will cause airflow noise, mechanical noise and increased resistance. The additional power consumption seriously affects the energy efficiency and reliability of the rotary compressor, so the semi-circular balance weight in the prior art can no longer meet the design requirements of high energy efficiency and low noise and vibration

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