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

摘要

An air replenishment and enthalpy increase control method and apparatus for a two-stage compressor (10) and equipment. The air replenishment and enthalpy increase control method comprises: when an air-replenishing electronic expansion valve (20) needs to be opened, a controller (40) gradually increases according to time the extent to which the air-replenishing electronic expansion valve (20) is opened; when the air-replenishing electronic expansion valve (20) is opened, acquiring the degree to which replenished air is superheated in a two-stage compressor (10) detected; adjusting, on the basis of the degree to which replenished air is superheated in the two-stage compressor (10), the extent to which the air-replenishing electronic expansion valve (20) is opened, where the air-replenishing electronic expansion valve (20) is arranged between a medium-pressure fluid storage tank (30) and the two-stage compressor (10), when the extent to which the air-replenishing electronic expansion valve (20) is opened is not zero, a gaseous refrigerant in the medium-pressure fluid storage tank (30) replenishes air and increases enthalpy for the two-stage compressor (10), thus solving the problem in the prior art of poor operating stability of a two-stage compressor.