Air conditioning system and control method thereof

Abstract

The invention provides an air conditioning system and a control method thereof. The system is characterized in that a first port of a four-way reversing valve communicates with a first port of an indoor heat exchanger, a second port of the four-way reversing valve communicates with a first port of an outdoor heat exchanger, a third port of the four-way reversing valve communicates with an exhaustport of a compressor, and a fourth port of the four-way reversing valve communicates with an air return port of the compressor; a second port of the indoor heat exchanger communicates with an inlet ofa flasher; a second port of the outdoor heat exchanger communicates with an outlet of the flasher; a gaseous refrigerant outlet of the flasher communicates with the air return port of the compressorthrough an air injection pipeline, and a throttling device is arranged on the air injection pipeline; and a first electronic expansion valve is arranged between the flasher and the indoor heat exchanger, a second electronic expansion valve is arranged between the flasher and the outdoor heat exchanger, and the indoor heat exchanger communicates with the outdoor heat exchanger through the first electronic expansion valve, the flasher and the second electronic expansion valve. The system can reduce the evaporation resistance, reduce the resistance of the liquid refrigerant and reduce the drynessof the refrigerant, thereby improving the heat exchange efficiency of the evaporator.

Description

technical field [0001] The invention relates to the technical field of air-injection enthalpy-increasing air-conditioning, in particular to an air-conditioning system and a control method thereof. Background technique [0002] When the air conditioning system is heating and running at low temperature, due to the low outdoor ambient temperature, the temperature difference between the evaporation temperature of the outdoor heat exchanger and the ambient temperature is very small, so the heat that can be absorbed from the external environment is relatively small, and a large amount of refrigerant is accumulated in the external unit. In the heat exchanger and gas-liquid separator, the suction and discharge volume of the compressor is insufficient, which makes the heat of the indoor mechanism drop significantly. Now some manufacturers use a system with gas injection to increase heating capacity. Generally, a flasher is used to obtain medium-pressure gaseous refrigerant, which is ...

AI Technical Summary

Problems solved by technology

[0002] When the air conditioning system is heating and running at low temperature, due to the low outdoor ambient temperature, the temperature difference between the evaporation temperature of the outdoor heat exchanger and the ambient temperature is very small, so the heat that can be absorbed from the external environment is relatively small, and a large amount of refrigerant is accumulated in the external unit. In the heat exchanger and gas-liquid separator, the suction and discharge volume of the compressor is insufficient, which makes the heat of the indoor mechanism drop significantly

Now some manufacturers use a system with gas injection to increase heating capacity. Generally, a flasher is used to obtain medium-pressure gaseous refrigerant, which is used as the injection gas of the main compressor of the outdoor unit. However, the flasher gas injection enthalpy increase scheme It is easy to cause incomplete gas-liquid separation, and the refrigerant entering the air-conditioning evaporator is generally a gas-liquid two-phase, the gaseous refrigerant has a large specific volume, and the resistance of the evaporator is large, resulting in low heat transfer capacity and affecting heat transfer efficiency

Images