Air-supplementing and enthalpy-increasing control method, facility and device for double-stage compressor

Abstract

The invention discloses an air-supplementing and enthalpy-increasing control method, facility and device for a double-stage compressor. The air-supplementing and enthalpy-increasing control method comprises the steps that when an air-supplementing electronic expansion valve needs to be opened, the opening of the air-supplementing electronic expansion valve is gradually increased under the control of a control in time sequence; after the air-supplementing electronic expansion valve is opened, the detected air-supplementing superheat degree of the double-stage compressor is obtained; the opening of the air-supplementing electronic expansion valve is adjusted based on the air-supplementing superheat degree of the double-stage compressor, wherein the air-supplementing electronic expansion valve is arranged between a medium-pressure liquid storage tank and the double-stage compressor; and when the opening of the air-supplementing electronic expansion valve is not zero, a gaseous refrigerant in the medium-pressure liquid storage tank supplements air and increases enthalpy for the double-stage compressor. By adopting the air-supplementing and enthalpy-increasing control method, facility and device for the double-stage compressor, the problem of a double-stage compressor in the prior art that the operation stability is poor is solved.

Description

technical field [0001] The invention relates to the field of air-conditioning control, in particular to a method, equipment and device for controlling air supplementation and enthalpy increase of a two-stage compressor. Background technique [0002] The lower the ambient temperature, the greater the demand for the heating capacity of the air conditioner. At present, the single-stage compression heat pump can only be started and operated normally at minus 20 degrees, and the heating capacity of the air conditioner is seriously attenuated in the low temperature environment, and the heating effect cannot be achieved. To be guaranteed, the reliability of the air conditioning unit has also been severely tested. [0003] Compared with single-stage compression heat pumps, the two-stage compression system with air injection enthalpy increases the heating capacity at low temperatures and has higher energy efficiency; and the two-stage compression system can reduce the pressure ratio ...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a method, device and device for controlling air supplementation and enthalpy increase of a two-stage compressor, so as to at least solve the technical problem of poor operation stability of the two-stage compressor in the prior art

Images