Control method and device for preventing liquid floodback of compressor and air conditioner

Abstract

The invention provides a control method and device for preventing liquid floodback of a compressor and an air conditioner. The control method for preventing liquid floodback of the compressor is basedon an air conditioning system, wherein the air conditioning system comprises the compressor and a gas-liquid separator; and the gas-liquid separator is equipped with a heating device. The control method comprises the steps of acquiring suction superheat, controlling the power of the heating device according to the suction superheat, and performing frequency reduction control on the compressor. The control method and device for preventing liquid floodback of the compressor judge the content of liquid refrigerants in suction gas according to the suction superheat, and control the compressor tooperate with frequency reduction; and at the same time, the heating device is controlled to heat the liquid refrigerants in the gas-liquid separator so as to evaporate the liquid refrigerants into gaseous refrigerants. The refrigerants absorbed by a gas return side of the compressor are ensured to be the gaseous refrigerants so as to avoid liquid floodback of the compressor. In addition, the suction superheat of the compressor after frequency reduction can be quickly increased, and the frequency of the compressor can be quickly adjusted back to a system set frequency so as to avoid the reduction in output capability of a unit caused by frequency reduction of the compressor.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a compressor liquid return prevention control method and device and an air conditioner. Background technique [0002] Compressor liquid return means that during the operation of the air conditioning system, the refrigerant returns to the suction side of the compressor in a liquid or gas-liquid two-phase state. Since the liquid refrigerant is incompressible, it will cause liquid shock in the compressor and wear the compressor. At present, in order to prevent the liquid return of the compressor, the multi-line is usually equipped with a gas-liquid separator in the system. After the gas-liquid two-phase refrigerant passes through the gas-liquid separator, it returns to the suction side of the compressor, and the liquid refrigerant gathers in the In the gas-liquid separator, part of the liquid refrigerant will return to the suction side of the compressor along with the gaseo...

AI Technical Summary

Problems solved by technology

However, since the refrigerant flows at a high speed in the system, it takes a certain amount of time to complete the detection of the refrigerant state and the control action of the electronic expansion valve, so the above method still cannot completely avoid the occurrence of compressor liquid back

Images