Variable capacity rotary compressor

Abstract

A variable capacity rotary compressor, which precisely controls variation of a compression capability into a desired discharge pressure, and which minimizes a resistance to rotation of a rotating shaft, and thus improves the capacity of the rotary compressor. The rotary compressor includes, a hermetic casing, a housing, disposed in the hermetic casing, having two compressing chambers having different capacities, a rotating shaft rotatably disposed in the two compressing chambers, two eccentric units mounted on the rotating shaft in the two compressing chambers, the two eccentric units being operated in opposite manners such that when either one of the two eccentric units is locked in an eccentric state to perform a compressing operation, the other eccentric unit is released from the eccentric state to release the compressing operation, two roller pistons fitted on outer surfaces of the first and second eccentric units, two vanes provided in the two compressing chambers to be radially moved while being in contact with the first and second roller pistons, and a pressure control unit to allow a discharging pressure to be applied to either one of the two compressing chambers, where an idle rotating operation is performed.

Description

technical field [0001] The present invention relates to a rotary compressor, and more particularly, to a variable capacity rotary compressor capable of changing the compression capacity of refrigerant. Background technique [0002] In recent years, refrigeration systems for air conditioners or refrigerators generally include variable-capacity rotary compressors, which are designed to change the compression capacity of the refrigerant to achieve the purpose of optimizing the refrigeration capacity to meet the requirements, Energy saving. [0003] US Patent No. 4,397,618A discloses a variable capacity rotary compressor adapted to control its compression capacity by locking or releasing the blades. The variable capacity rotary compressor includes a housing in which a cylindrical compression chamber is provided, and a rolling piston disposed in the compression chamber of the housing to rotate eccentrically. The housing is provided with vanes which can move radially back and fo...

AI Technical Summary

Problems solved by technology

[0004] However, since the above variable capacity rotary compressor is configured to control the compression capacity in such a manner that the compression operation is prevented by locking the vanes for a certain period and the compression operation is allowed by releasing the vanes for a certain period, it is difficult to Compression capacity changes to desired discharge pressure

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