Variable capacity rotary compressor

Abstract

A variable capacity rotary compressor capable of varying a compression capacity thereof. The variable capacity rotary compressor includes a housing defined therein with first and second compressing chambers having different volumes, a rotating shaft adapted to rotate in the first and second compressing chambers, a compressing unit arranged in the first and second compressing chambers, and adapted to perform a compression operation in a selected one of the first and second compressing chambers in accordance with a change of a rotating direction of the rotating shaft, and a drive motor adapted to rotate the rotating shaft in a first direction or in a second direction, the drive motor being variable in rotating speed in accordance with an electrical control operation. The variable capacity rotary compressor can achieve a multi-stage variation in capacity thereof within a wide range while reducing a variation range of rotating speed, as compared to conventional cases, because it is possible not only to mechanically vary the capacity of the compressing device in accordance with a change of the rotating direction of the drive motor, but also to control the rotating speed of the drive motor in accordance with an electrical control method.

Description

technical field [0001] The present invention relates to a variable capacity rotary compressor, and more particularly to a variable capacity rotary compressor capable of changing refrigerant compression capacity in a multi-stage manner within a wide range. Background technique [0002] Recently developed air conditioners and refrigerator coolers have a function of changing cooling capacity according to cooling conditions such as temperature in a confined space to be cooled, in order to achieve optimal cooling operation while reducing energy consumption. For this function, such devices typically use variable capacity rotary compressors for varying their refrigerant compression capabilities. [0003] Known variable capacity rotary compressors generally comprise compression means capable of compressing refrigerant and subsequently discharging the compressed refrigerant, and a drive motor adapted to drive said compression means. For a driving motor of such a compressor, a genera...

AI Technical Summary

Problems solved by technology

As a result, the life of the drive motor and compression unit may be shortened

Also, when the rotation speed of the driving motor changes suddenly, the entire system of the rotary compressor may operate abnormally because the operating conditions of the compression device must change suddenly

For example, since the oil supply conditions are different from each other in high-speed and low-speed operation, it will not be possible to effectively supply oil to the compression device

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