Anti-freezing defrosting control method and air conditioner

Abstract

The invention provides an anti-freezing defrosting control method and an air conditioner, and relates to the technical field of air conditioners. The anti-freezing defrosting control method is appliedto the air conditioner. The control method comprises the steps that the current I of an indoor fan is detected; according to the current I, the speed increasing change rate delta k and the amplification delta A of the current I are obtained; and according to the speed increasing change rate delta k and the amplification delta A, anti-freezing protection is started. Due to the fact that after a heat exchanger of an indoor unit is frosted, frost is attached to the surfaces of fins of the heat exchanger, even the fins of the heat exchanger are blocked, the air circulation resistance is increased, the air volume is rapidly reduced, and the current of the indoor unit is increased. Therefore, the speed increasing change rate delta k and the amplification delta A of the current I are obtained bydetecting the current I of the indoor fan, whether the heat exchanger of the indoor unit is frosted or even frozen or not can be accurately judged according to the speed increasing change rate deltak and the amplification delta A, and as a result, anti-freezing protection is started in time, the heat exchanger of the indoor unit is prevented from being frosted and frozen too much, and the refrigerating effect of the indoor unit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method for anti-freezing and defrosting and an air conditioner. Background technique [0002] When the existing air conditioner is cooling at low temperature, due to the abnormal tube temperature of the indoor unit, for example, the tube temperature of the indoor unit is slightly high, it just cannot make the air conditioner enter the anti-freeze protection, but the actual tube temperature of the indoor unit is enough to make the air conditioner enter Anti-freeze protection, the reason for the slightly high tube temperature may be that the installation position of the temperature sensing package is not selected properly, or the heat exchanger has few shunts, resulting in small flow and easy to drift. The indoor unit cannot prevent freezing and defrosting in time, and the heat exchanger of the indoor unit is frosted or frozen, which reduces the cooling effect of...

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is that when the existing air conditioner is cooling at low temperature, due to the abnormal tube temperature of the indoor unit, the air conditioner just cannot enter the anti-freezing protection, and it is easy to cause the indoor unit to fail to prevent freezing and defrosting in time, and the heat exchange of the indoor unit occurs Frosting and icing occur on the indoor unit, reducing the cooling effect of the indoor unit and affecting the user experience

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