GAS-REPLENISHING AND ENTHALPY-INCREASING CONTROL METHOD, DEVICE AND APPARATUS FOR TWO-STAGE COMPRESSOR

摘要

Provided are a gas-replenishing and enthalpy-increasing control method,device and apparatus for a two-stage compressor (10). The gas-replenishing andenthalpy-increasing control method includes: when a gas-replenishingelectronicexpansion valve (20) needs to be opened, gradually increasing, by a controller(40), an opening degree of the gas-replenishing electronic expansion valve(20)in a time sequence; after the gas-replenishing electronic expansion valve (20)isopened, acquiring a detected gas-replenishing superheat degree of a two-stagecompressor (10); and adjusting, based on the gas-replenishing superheat degreeof the two-stage compressor (10), the opening degree of the gas-replenishingelectronic expansion valve (20), wherein the gas-replenishing electronicexpansion valve (20) is disposed between a medium-pressure liquid storage tank(30) and the two-stage compressor (10), and when the opening degree of thegas-replenishing electronic expansion valve (20) is not zero, a gaseousrefrigerant in the medium-pressure liquid storage tank (30) replenishes gasandincreases enthalpy for the two-stage compressor (10), thereby solving theproblem in the related art of unsatisfying operating stability of a two-stagecompressor.