Air-injection enthalpy-increasing air-conditioning system and its defrosting control method

Abstract

The invention discloses an air-injection enthalpy-increasing air-conditioning system. The air-injection enthalpy-increasing air-conditioning system includes an indoor heat exchanger, an outdoor heat exchanger, a compressor and a four-way reversing valve: the compressor includes a liquid storage tank, and the compressor is equipped with Exhaust port, air supply port and suction port, the liquid storage tank is provided with a return port, and the return port communicates with the suction port; the four-way reversing valve has a first end to a fourth end, and the first end is connected to the exhaust port of the compressor. The second end is connected to the inlet of the indoor heat exchanger, the third end is connected to the outlet of the outdoor heat exchanger, and the fourth end is connected to the return air port; the air conditioning system also includes a bypass circuit, which is connected to the discharge port of the compressor. Between the gas port and the outdoor heat exchanger, the bypass circuit includes a control valve. The invention also discloses a defrosting control method. The defrosting method of the present invention not only does not affect the heating effect, but also can stabilize the indoor ambient temperature and reduce the reversing action of the four-way reversing valve, thereby increasing the reliability of the equipment and improving the user comfort.

Description

technical field [0001] The invention relates to the technical field of refrigeration and heating, in particular to an air-injection enthalpy-increasing 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...

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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