Method for eliminating friction pair of refrigerator inverter compressor by adopting magnetic bearing

Abstract

The invention relates to a method for eliminating friction pair of a refrigerator inverter compressor by adopting a magnetic bearing. The method comprises the following steps: step one, enabling the distance I between the lower surface of a permanent magnet rotor and the lower surface of a stator core to be greater than the distance II between the upper surface of the permanent magnet rotor and the upper surface of the stator core; step two, enabling the center line of the permanent magnet rotor to be below the center line of the stator core to produce magnetic eccentricity in a specific direction; step three, generating an upward magnetic pull force F opposite to the gravity direction on the permanent magnet rotor under the action of the specific magnetic eccentricity; disappearing a friction pair between a crankshaft thrust surface and a crankcase thrust surface and between the upper surface of an inner hole of the permanent magnet rotor and the lower surface of a crankcase axle hole, so that the friction pair at the position disappears and cannot generate friction heat any more, and heating of the compressor is reduced. The method can greatly improve the reliability and the service life of the inverter compressor, thus having broad market space.

Description

technical field [0001] The invention relates to the field of refrigeration compressors for refrigerators, in particular to a method for eliminating friction pairs of frequency conversion compressors for refrigerators by using magnetic suspension bearings. Background technique [0002] For refrigerator inverter compressors, the general variable speed range is 1200-4500 rpm. The higher the speed, the greater the load, the greater the friction work, and the greater the noise. The smaller the friction work, the better the mechanical efficiency of the compressor, and reducing the friction pairs is more beneficial to reducing noise. At present, there are 5 mechanical friction pairs in the frequency conversion compressor of the refrigerator, the thrust surface of the crankshaft and the thrust surface of the crankcase, the outer circle of the long axis of the crankshaft and the shaft hole of the crankcase, the large hole of the connecting rod and the outer circle of the crank throw ...

AI Technical Summary

Problems solved by technology

The friction pair between the thrust surface of the crankshaft and the thrust surface of the crankcase has traditionally been improved by improving lubrication, replacing sliding friction with rolling friction, etc., so as to improve efficiency, but because the friction pair still exists here, it cannot be truly completely improved. Eliminates the loss of efficiency and increased noise from friction here

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