Multi-split air conditioning system based on double compressors and control method of multi-split air conditioning system

Abstract

The invention relates to a multi-split air conditioning system based on double compressors and a control method of the multi-split air conditioning system. The multi-split air conditioning system based on the double compressors comprises the compressor I and the compressor II. Exhaust ports of the compressor I and the compressor II pass through an oil separator and are connected to a port D of a four-way valve. The four-way valve is further connected with an indoor heat exchanger, an outdoor heat exchanger and a gas-liquid separator. The outdoor heat exchanger passes through a plate heat exchanger and is connected with the indoor heat exchanger. Air nozzles of the compressor I and the compressor II pass through an electronic expansion valve III and an electronic expansion valve IV respectively and then are connected to an auxiliary side outlet of the plate heat exchanger. By controlling the opening degree of the electronic expansion valve III and the opening degree of the electronic expansion valve IV, the control precision of the air injection amount is greatly improved, and the optimal air injection effect is achieved. Moreover, the two compressors do not influence each other, sothat the reliability of the two compressors is greatly improved.

Description

technical field [0001] The present invention relates to an air-conditioning system and a control method, in particular to a multi-connected air-conditioning system and a control method, specifically a dual-compressor-based multi-connected air-conditioning system and a control method thereof. Background technique [0002] As the ambient temperature decreases, the heating capacity and corresponding COP of the heat pump air-conditioning unit also decrease. However, the number of consumers continues to increase as the external ambient temperature decreases. In order to meet the market demand, the "air jet enthalpy increase" technology came into being. It can not only greatly increase the heating capacity, but also increase the COP, so it is more and more widely used. [0003] At present, most of the multi-line systems using gas injection enthalpy increase technology realize the control of gas injection through a single plate heat exchanger and a single electronic expansion valv...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the multi-line systems using gas injection enthalpy increase technology realize the control of gas injection through a single plate heat exchanger and a single electronic expansion valve. There are problems such as low control accuracy, low efficiency, and interference of the dual compressor system, which greatly reduces the overall machine capacity. system reliability

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