Air conditioner and defrosting control method thereof

Abstract

The invention discloses an air conditioner and a defrosting control method thereof. The method comprises the following steps that when the air conditioner receives defrosting ending signals in the defrosting process, a compressor is controlled to shut down, and after delaying of first preset time, steering of a four-way valve is controlled; after steering of the four-way valve is finished, the compressor is controlled to be started; the normal frequency increasing rate of the compressor is obtained, the current frequency increasing rate of the compressor is obtained according to the normal frequency increasing rate, frequency increasing control is conducted on the compressor according to the current frequency increasing rate, and the current frequency increasing rate is smaller than the normal frequency increasing rate. According to the method, when the air conditioner is switched into the heating mode from the defrosting mode, the frequency increasing rate reducing control is conducted on the compressor, and accordingly the situation that the temperature at the outlet position of a throttling element is too low, and lubricating oil generates flocculent flow and blocks the throttling element is effectively prevented.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner defrosting control method, a non-volatile computer storage medium and an air conditioner. Background technique [0002] R290 (propane) refrigerant, also known as refrigerant, is a new type of environmentally friendly refrigerant, mainly used in central air conditioners, heat pump air conditioners, household air conditioners and other small refrigeration equipment. [0003] However, in a saturated liquid state, the density of R290 is smaller than that of other refrigerants such as R22 (difluorochloromethane), so the charging amount of R290 is small under the same volume. Due to the limitation of the charging amount, the charging amount of the air conditioner with the same capacity segment is much smaller than that of the air conditioner using other refrigerants, and in order to meet the cooling capacity and energy efficiency requirements, it is necessar...

AI Technical Summary

Problems solved by technology

Due to the limitation of the charging amount, the charging amount of the air conditioner with the same capacity segment is much smaller than that of the air conditioner using other refrigerants, and in order to meet the cooling capacity and energy efficiency requirements, it is necessary to use a large displacement Compressor and large-area heat exchanger, but this will lead to when the capillary is used as a throttling device, at the end of defrosting, the temperature at the capillary is lower than the pour point temperature of the lubricating oil for a long time, causing the lubricating oil to flocculate In severe cases, the capillary will be blocked and the whole machine will fail

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