Rotary compressor and crankshaft thereof

Abstract

The invention discloses a rotary compressor and a crankshaft thereof. The crankshaft comprises a main shaft part and an eccentric part formed on the main shaft part, wherein a first weight-reduction balance hole is formed in the eccentric part, the first weight-reduction balance hole upwards penetrates through the upper end surface of the eccentric part and downwards penetrating through the lower end surface of the eccentric part, and the first weight-reduction balance hole also penetrates through the outer circumferential surface of the eccentric part. According to the crankshaft of the embodiment of the present invention, on the premise of maintaining the eccentricity of the crankshaft, the eccentric weight of the crankshaft can be reduced, the rotary eccentric inertia force of the rotary compressor utilizing the crankshaft can be reduced, the vibration and noise of the compressor can be reduced, and the operation reliability of the compressor for a long time can be improved. Moreover, while the rotary eccentric inertia force is reduced, the weight of a balance block in the compressor can be reduced, even the balance block can be avoided, so that the manufacturing cost of the compressor can be reduced, the air resistance suffered by the balance block when in rotation can be reduced, and the energy efficiency of the compressor can be improved.

Description

Technical field [0001] The present invention relates to the field of compressors, in particular to a rotary compressor and its crankshaft. Background technique [0002] For rotary compressors, the main working component is the rolling piston nested on the eccentric crankshaft. When the compressor motor is energized, the eccentric crankshaft connected to the motor rotor will drive the rolling piston to move eccentrically in the compression chamber of the pump body. So as to realize the compression of refrigerant gas. This type of mechanism is widely used in various refrigeration equipment technical fields due to its simple structure and high compression efficiency. [0003] Because of the eccentric rotating structure, the center of gravity of the moving parts is not on the rotating shaft, so the compressor will generate a rotating inertia force when it is running, and its direction points to the eccentric direction. The presence of eccentric inertial force will increase the vibrat...

AI Technical Summary

Problems solved by technology

Using this method can effectively reduce the noise and vibration of the compressor, but since the balance weight is installed on the motor rotor, in order to avoid the decline of the motor efficiency, the requirements for the magnetic permeability of the balance weight material are relatively strict, resulting in high cost of the balance weight material

In addition, after the balance weight is added to the motor rotor, the balance weight will be subjected to a large gas force during the operation of the compressor, which will increase the running resistance of the compressor, resulting in a decrease in the energy efficiency of the compressor, and even the high-speed rotation of the compressor. The middle balance weight produces a large inertial force, which will also increase the wear between the crankshaft and the bearing when the inertial force acts on the crankshaft

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