Anti-frosting control method for indoor unit of air conditioner

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to an anti-frosting control method for an indoor unit of an air conditioner in order to solve the problem that the user experience is affected due to loss of refrigerating capacity of the air conditioner during defrosting of the indoor unit. The anti-frosting control method comprises following steps: S110, detecting internal coil pipe temperature Tz at intervals of preset time under the condition of a refrigeration mode of the air conditioner; S120, judging a temperature interval where the internal coilpipe temperature Tz is located; and S130, selectively controlling opening of an expansion valve of the air conditioner according to the temperature interval. According to the steps, the opening of theexpansion valve is controlled according to the interval of the internal coil pipe temperature, then refrigerant flow in the air conditioner pipeline is controlled, slow defrosting of an indoor evaporator is realized, frosting speed of the indoor unit is reduced, and the air conditioner is enabled to less enter the frosting period, so that defrosting carried out by closing the expansion valve is as little as possible.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to an anti-frosting control method for an air conditioner indoor unit. Background technique [0002] After the air conditioner has been cooling for a period of time, since the temperature of the evaporator of the indoor unit is lower than the saturation temperature corresponding to the atmospheric pressure, condensed water will continue to be generated. When the temperature of the refrigerant is lower than zero, the condensed water will form frost. The current common control method is to detect the duration of the coil temperature of the indoor unit, and when the set time is reached, the indoor unit enters the anti-frost mode. To be specific, take the multi-connected central air conditioner in cooling operation as an example. When it is detected that the temperature of the inner coil is lower than a certain value for a certain period of time, in order to achieve...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that when the indoor unit is in the defrosting cycle, because there is no refrigerant flow in the indoor unit pipeline, the air conditioner does not have the cooling function, so the air blown from the indoor unit is natural wind with the same temperature as the environment. , thereby affecting the cooling experience and comfort of the user

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