Anti-frost control method for air-conditioning indoor unit

Abstract

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. In order to solve the problem that the air conditioner loses cooling capacity and affects the user experience during the defrosting of the indoor unit, the anti-frost control method proposed by the present invention includes the following steps: S110, when the air conditioner is in the cooling mode, each Detecting the temperature Tz of the inner coil at intervals of a preset time; S120, judging the temperature range of the temperature Tz of the inner coil; S130, selectively controlling the opening of the expansion valve of the air conditioner according to the temperature range. In the above steps of the present invention, the opening of the expansion valve is controlled according to the temperature range of the inner coil, and then the refrigerant flow rate in the air conditioner pipeline is controlled, so as to realize the slow defrosting of the indoor evaporator and delay the frosting of the indoor unit The speed will make the air conditioner less likely to enter the frosting period, so as to defrost as little as possible by closing the expansion valve.

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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