A multi-connection system and its control method for preventing compressor liquid return

Abstract

The invention relates to a multi-line system for preventing compressor liquid return and its control method, which mainly includes a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an economizer, a heating electronic expansion valve assembly, an outdoor A refrigerant circulation circuit composed of a heat exchanger and a gas-liquid separator, the inlet of the evaporation side of the economizer is connected to the bottom of the gas-liquid separator through a liquid outlet pipe, so that the liquid refrigerant in the gas-liquid separator can be introduced into the Economizer described above to prevent compressor liquid flooding. The control method of this system includes: comparing the inlet temperature of the compressor with the saturation temperature, deciding whether to open the liquid return control electronic expansion valve, and then adjusting the opening degree of the liquid return control electronic expansion valve by comparing the temperature at the inlet and outlet of the economizer, For safe and efficient operation.

Description

technical field [0001] The invention relates to an air conditioning system, in particular to a multi-connection system capable of preventing liquid return from a compressor, in particular to a multi-connection system capable of preventing liquid return from a compressor and a control method thereof. Background technique [0002] The multi-connected air conditioning system has the characteristics of long refrigerant pipes, so the amount of refrigerant in the entire system is relatively large. In some specific cases, a large amount of liquid refrigerant will be stored in the outdoor unit, which can easily cause the liquid refrigerant to return directly to the compressor, resulting in compressor liquid shock. Once the liquid hammer phenomenon occurs, the compressor will be damaged immediately, causing serious failure. When a general multi-connected system encounters liquid return from the compressor, it usually prevents compressor liquid shock by closing the electronic expansi...

AI Technical Summary

Problems solved by technology

In some specific cases, a large amount of liquid refrigerant will be stored in the outdoor unit, which will easily cause the liquid refrigerant to return directly to the compressor, resulting in compressor liquid shock.

Once the liquid hammer phenomenon occurs, the compressor will be damaged immediately, causing serious failure

When a general multi-connected system encounters liquid return from the compressor, it usually prevents compressor liquid shock by closing the electronic expansion valve of the system or reducing the frequency of the compressor, but this will lead to a decrease in system performance and affect user experience.

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