Air conditioning system and defrosting control method thereof

Abstract

The invention discloses an air conditioning system. The air conditioning system comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way reversing valve. The compressor comprises a liquid storage tank and is provided with an exhaust port and an air suction port. The liquid storage tank is provided with an air returning port and the air returning port communicates with the air suction port. The four-way reversing valve comprises a first end, a second end, a third end and a forth end. The first end communicates with the exhaust port of the compressor, the second end is connected with an inlet of the indoor heat exchanger, the third end is connected with an outlet of the outdoor heat exchanger and the forth end communicates with the air returning port. The air conditioning system further comprises a bypass circuit. The bypass circuit is connected between the exhaust port of the compressor and the inlet of the outdoor heat exchanger. The bypass circuit comprises a control valve and an ejector. The invention further discloses a defrosting control method of the air conditioning system. According to the defrosting control method, the heating effect would not be affected, not only that but the indoor environment temperature can be stabilized and the reversing motion of the four-way reversing valve can be reduced, so that the reliability of equipment and the use comfort of a user can be improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration and heating, in particular to an air-conditioning system and a defrosting control method thereof. Background technique [0002] Heat pump air conditioners can not only cool in summer, but also heat in winter, so they are widely welcomed by users. During the heating process, due to the low outdoor ambient temperature and high humidity, frosting is prone to occur. If the air conditioner is severely frosted, the air conditioning system will automatically execute the defrosting action. When the defrosting time is set too short, it will cause The defrosting of the outdoor unit is not clean, which affects the heating effect, increases the power consumption of the user, and reduces the energy efficiency; and when the defrosting time is set too long, the comfort of the user will be greatly reduced, and there may be When defrosting occurs, cold air is blown into the room. Therefore, it is necessary ...

AI Technical Summary

Problems solved by technology

During the heating process, due to the low outdoor ambient temperature and high humidity, frosting is prone to occur. If the air conditioner is severely frosted, the air conditioning system will automatically execute the defrosting action. When the defrosting time is set too short, it will cause The defrosting of the outdoor unit is not clean, which will affect the heating effect, increase the power consumption of the user, and reduce the energy efficiency; and when the defrosting time is set too long, the user's comfort will be greatly reduced, and there may be When defrosting occurs, cold air is blown into the room. Therefore, it is necessary to change the defrosting control method to solve this problem.

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