Refrigerating system for gas supplementing and enthalpy increasing, air conditioner, and control method thereof

Abstract

The invention discloses a refrigerating system for gas supplementing and enthalpy increasing, an air conditioner, and a control method thereof, and belongs to the technical field of air conditioners.The refrigerating system comprises a compressor unit with a middle cavity, a plate type heat exchanger with a plurality of ports, and a gas-liquid separator. One of the ports of the plate type heat exchanger communicates with the middle cavity of the compressor unit and the gas-liquid separator. A gas supplementing valve is arranged between the plate type heat exchanger and compressors, and a venting valve is arranged between the plate type heat exchanger and the gas-liquid separator. The air conditioner comprises the system. According to the control method of the air conditioner, opening andclosing of the gas supplementing valve and the venting valve are controlled through the exhaust pressure and the suction pressure of the compressors. Liquid impact can be effectively avoided, and meanwhile, the property and reliability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a refrigeration system for replenishing air and increasing enthalpy, an air conditioner and an air conditioner control method. Background technique [0002] Most of the existing refrigeration systems that supplement air to increase enthalpy use refrigerant injection from the plate heat exchanger to the intermediate chamber of the compressor to increase the enthalpy difference and improve energy efficiency. In the process of use, it is found that if the indoor heat load of the air-cooled multi-connected air conditioner unit suddenly decreases significantly, the frequency of the compressor will decrease, and the refrigerant injected into the compressor circuit will not be able to evaporate to a superheated state in the plate heat exchanger, and will be in a liquid state. Refrigerant sprayed into the middle cavity of the compressor will cause liquid shock, which...

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Problems solved by technology

In the process of use, it is found that if the indoor heat load of the air-cooled multi-connected air conditioner unit suddenly decreases significantly, the frequency of the compressor will decrease, and the refrigerant injected into the compressor circuit will not be able to evaporate to a superheated state in the plate heat exchanger, and will be in a liquid state. Refrigerant sprayed into the middle cavity of the compressor will cause liquid shock, which will damage the compressor; in addition, in terms of compressor reliability, the injection of air into the compressor will increase the system pressure ratio, and when the compressor is running near the pressure ratio limit, it will Refrigerant injected by the compressor will exceed the operating range of the compressor and affect the performance of the compressor

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