Adjusting mechanism for internal pressure ratio of compressor, and single-screw compressor

Abstract

The invention discloses an adjusting mechanism for the internal pressure ratio of a compressor, and a single-screw compressor. The adjusting mechanism comprises a slide valve, a connection support, a driving piston and a cylinder, wherein the slide valve is connected with the driving piston via the connection support; the cylinder is fixedly connected with the shell of the single-screw compressor; the driving piston is arranged in the cylinder, is in clearance fit with the cylinder and divides the cylinder into a piston pressure chamber and an environmental pressure chamber in a height direction; the piston pressure chamber is connected with the final compression pressure of the single-screw compressor via a first air passage; and the environmental pressure chamber is connected with the exhausting pressure of the single-screw compressor via a second air passage. According to the invention, the final compression pressure of the single-screw compressor is introduced into the piston pressure chamber, the exhausting pressure of the single-screw compressor is introduced into the environmental pressure chamber, and the piston is used for driving the slide valve to move, so the internal pressure ratio of the compressor is adjusted; self-adaptive stepless adjustment of the internal pressure ratio of the compressor is realized, and control precision is improved; and holes are not perforated on the shell of the compressor, so the integral manufacturing cost of the compressor is reduced.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a compressor internal pressure ratio adjustment mechanism and a single-screw compressor. Background technique [0002] The internal pressure ratio of the compressor refers to the degree to which the screw compressor rotor itself increases the pressure, while the external pressure ratio is jointly determined by the condenser and the evaporator. External pressure ratio=condensing pressure / evaporating pressure=(exhaust pressure+0.1) / (suction pressure+0.1). Under normal circumstances, the compressor is in a normal working state, its external pressure ratio remains stable, and the internal pressure ratio and external pressure ratio of the compressor are equal. However, in some special cases, when the compressor works under non-design conditions, the external pressure ratio of the compressor will change, so that the internal pressure and external pressure ratio of the compressor w...

AI Technical Summary

Problems solved by technology

However, in some special cases, when the compressor works under non-design conditions, the external pressure ratio of the compressor will change, so that the internal pressure and external pressure ratio of the compressor will no longer be the same

Specifically, when the external pressure ratio is greater than the internal pressure ratio, it is called undercompression, and when the external pressure ratio is smaller than the internal pressure ratio, it is called overcompression. Both of these situations will lead to a decrease in the efficiency of the compressor unit

However, the traditional compressor internal pressure ratio adjustment device is very complicated and requires many additional components, resulting in increased costs

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