Defrosting control method and air conditioner

Abstract

The invention discloses a defrosting control method. A heating mode is firstly switched to a defrosting mode: reducing a frequency of a compressor from a first compression frequency to a second compression frequency; closing an electromagnetic valve, and reducing the frequency of the compressor is from a second compression frequency to a third compression frequency; when high and low pressure difference meets the reversing condition of a four-way reversing valve, opening the four-way reversing valve for reversing, and opening the electromagnetic valve at the same time; increasing the frequencyof the compressor from a third compression frequency to a fourth compression frequency, and switching to the defrosting mode; then, the defrosting mode is switched back to the heating mode: reducingthe compressor frequency from the fourth compression frequency to the second compression frequency; closing the electromagnetic valve, and reducing the compressor frequency from the second compressionfrequency to the third compression frequency when the high and low pressure difference meets the reversing condition of the four-way reversing valve; opening the four-way reversing valve for reversing, and opening the electromagnetic valve at the same time; increasing the compressor frequency from the third compression frequency to the first compression frequency; and switching back to the heating mode. According to the defrosting control method, the defrosting process is short in time consumption and small in temperature fluctuation.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a defrosting control method and an air conditioner. Background technique [0002] Inverter air conditioners have the advantages of comfortable temperature control, energy saving and power saving, and their market share is increasing. When operating under heating conditions in winter, if high-frequency operation is desired to obtain large heating capacity, the outdoor unit of the air conditioner is prone to frost and is unavoidable. During the process of frosting and defrosting, the room temperature tends to fluctuate, and the comfort of the user experience becomes poor. At the same time, it also seriously affects the performance and energy efficiency of the air conditioner. At present, the defrosting of air conditioners adopts reverse cycle defrosting, that is, switching to cooling operation for defrosting, and then switching back to heating to continue running after de...

AI Technical Summary

Problems solved by technology

However, both of these two control schemes have the problem that the frequency reduction process or the frequency reduction shutdown process takes a long time. At the same time, it brings long-term temperature control fluctuations, poor heating comfort, and serious waste of energy consumption.

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