Variable-capacity compression mechanism, compressor and air conditioner

Abstract

The invention relates to the technical field of compressors, in particular to a variable-capacity compression mechanism, a compressor and an air conditioner. The variable-capacity compression mechanism comprises a first cylinder, a roller and at least one sliding piece assembly, wherein the first cylinder is provided with a compression cavity, a suction port communicating with the compression cavity, and an exhaust mechanism capable of being opened under a first preset pressure; the roller is arranged in the compression cavity; and the sliding piece assembly is arranged in the compression cavity and divides the compression cavity into a suction side and an exhaust side, and a low-pressure cavity and a high-pressure cavity are separately formed in the suction side and the exhaust side in the compression process. The variable-capacity compression mechanism further comprises a variable-capacity switching mechanism, wherein the variable-capacity switching mechanism comprises a variable-capacity channel and a control valve, wherein the variable-capacity channel communicates with the exhaust side and is used for guiding air into the exhaust side to basically eliminate the pressure difference between the suction side and the exhaust side or is used for guiding air at a pressure not lower than the first preset pressure to the exhaust side to make the exhaust mechanism normally open; and the control valve is used for controlling on-off of the variable-capacity channel. The variable-capacity mechanism, the compressor and the air conditioner are simple in structure, convenient to control, more reliable and practical and free of noise and backflow.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a variable capacity compression mechanism, a compressor and an air conditioner. Background technique [0002] In order to achieve energy saving and emission reduction, the compressors in the prior art usually use variable capacity compressors to adjust the cooling capacity output by the compressors, so as to meet cooling demands under different loads. For example, a large air conditioner with multiple indoor units sharing one outdoor unit. When multiple indoor units work together, all the compression cylinders of the outdoor units must be in the suction working state at the same time. The cylinder is in an unloaded state (unloaded state means that the compressed cylinder does not compress gas) to reduce the cooling capacity of the compressor. [0003] Taking the roller-type double-cylinder compressor as an example, there are upper cylinder and lower cylinder in the compresso...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of complex structure, inconvenient control and easy failure of the variable capacity compressor in the prior art, so as to provide a more reliable and practical variable capacity compression mechanism with simple structure, convenient control

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