Low-backpressure rotary type compressor

Abstract

A disclosed low-backpressure rotary type compressor comprises a housing, a compression mechanism, an oil separator for performing oil-gas separation on a refrigerant discharged from a cylinder, and an oil pool for holing lubricating oil separated from the oil separator; the compression mechanism comprises a cylinder assembly, a piston, a slide sheet, a main bearing and an auxiliary bearing; the cylinder possesses a slide-sheet chamber, the slide-sheet chamber is provided with an oil supply hole, and when the slide sheet makes reciprocated motions, the tail end of the slide sheet stretches into or out of the slide-sheet chamber so as to enable the internal capacity of the slide-sheet chamber to be varied between a maximum capacity V2 and a minimum capacity V1; and the oil pool is communicated with the oil supply hole via a slide-sheet oil supply path, and the ratio of the maximum capacity V2 and the minimum capacity V1 satisfies the following relationship: 35%<=V1 / V2<=85%. According to the low-backpressure rotary type compressor, the pressure fluctuation of the slide-sheet chamber is not too large or too small, clinging seal between the slide sheet and the piston is guaranteed, and when the stress demand of the slide sheet is relatively well satisfied, relatively good compressor performances are realized.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a low back pressure rotary compressor. Background technique [0002] In the low back pressure rotary compressor, due to the low-pressure suction pressure environment inside the shell, the gas force acting on the tail end of the slide vane is not enough to ensure the close contact between the tip of the slide vane and the outer diameter of the piston. Therefore, it is necessary to place the tail end of the slide vane The design of the region forms a sliding vane cavity that is sealed and separated from the inner diameter of the housing, and provides a relatively high-pressure environment for the sliding vane cavity to ensure that the tip of the sliding vane is in close contact with the outer diameter of the piston. Moreover, since the vane cavity needs to be sealed and separated from the inside of the housing, the oil pool inside the housing cannot be used to achieve lubrication. Theref...

AI Technical Summary

Problems solved by technology

If the structural volume design of the vane cavity is unreasonable, it may occur that when the maximum pressure of the vane cavity is too large, the power consumption of the compressor will increase, and even the abnormal current will cause the motor to trip and stop. If the minimum pressure of the cavity is too small, the close contact between the tip of the sliding vane and the outer diameter of the piston cannot be ensured, resulting in abnormal sound and abnormal wear caused by the collision between the sliding vane and the piston, and leakage leading to performance deterioration of the compressor

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