Air conditioner defrosting control method and device

Abstract

The invention discloses a defrosting control method of an air conditioner. The defrosting control method comprises the following steps of: obtaining the inlet temperature and outlet temperature of an outdoor heat exchanger in real time in a heating operation process of the air conditioner; when the obtained outlet temperature is greater than or equal to a first preset temperature and the obtained inlet temperature is less than a second preset temperature, opening a one-way valve so as to control the air conditioner to enter a first defrosting manner for defrosting, wherein the second preset temperature is greater than the first preset temperature; and when the obtained outlet temperature is less than the first preset temperature, switching the air conditioner to a refrigeration mode to operate so as to defrost in a second defrosting mode. The invention also provides a defrosting control device of the air conditioner. The method and device have the beneficial effects that the defrosting efficiency is improved, and the problem that frequent defrosting in a refrigeration mode seriously affects the comfortableness of a heat pump air conditioner is avoided.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device for an air conditioner. Background technique [0002] When the household heat pump air conditioner is heating in winter, the outdoor heat exchanger acts as an evaporator to absorb heat. When the outdoor ambient temperature is too low or the heating operation time is too long, the temperature of the refrigerant pipe of the outdoor heat exchanger will be lower than At zero temperature, the moisture in the outdoor air condenses into frost on the surface of the outdoor heat exchanger, and even icing occurs. After the outdoor heat exchanger is frosted, the heat transfer resistance between the refrigerant in the pipeline and the air will increase greatly, and then Affect the heating effect of the entire heat pump air conditioner, resulting in a decrease in indoor heating efficiency. [0003] The existing defrosting methods of heat pump a...

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Problems solved by technology

[0002] When the household heat pump air conditioner is heating in winter, the outdoor heat exchanger acts as an evaporator to absorb heat. When the outdoor ambient temperature is too low or the heating operation time is too long, the temperature of the refrigerant pipe of the outdoor heat exchanger will be lower than At zero temperature, the moisture in the outdoor air condenses into frost on the surface of the outdoor heat exchanger, and even icing occurs. After the outdoor heat exchanger is frosted, the heat transfer resistance between the refrigerant in the pipeline and the air will increase greatly, and then Affect the heating effect of the entire heat pump air conditioner, resulting in a decrease in indoor heating efficiency

[0003] The existing defrosting methods of heat pump air conditioners usually adopt the following two defrosting methods. One method is the four-way valve reversing method, which switches from heating mode operation to cooling mode operation. The high-temperature and high-pressure refrigerant discharged by the compressor enter the heat exchanger of the outdoor unit, and exchange heat with the frost layer attached to the heat exchanger of the outdoor unit, thereby achieving the purpose of defrosting. However, due to the reverse operation of the cooling mode, each defrosting of the outdoor unit needs to The heater absorbs heat from the room, and the room temperature will gradually decrease with the defrosting process. To defrost by switching the four-way valve to run the refrigeration mode will seriously affect the comfort of the heat pump air conditioner; another way is to open the one-way valve set between the compressor exhaust port and the outdoor heat exchanger inlet, Part of the high-temperature and high-pressure refrigerant at the compressor exhaust port enters the outdoor heat exchanger for defrosting, but the defrosting efficiency of this method is low

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