Air conditioner and antifreezing control method thereof

Abstract

The invention discloses an air conditioner and an antifreezing control method thereof. The method comprises the following steps that when the air conditioner operates in a refrigeration mode or a dehumidification mode, the power of an indoor fan is obtained, and the pipe temperature of an outdoor heat exchanger is detected; when it is judged that filth blockage does not happen in an indoor heat exchanger according to the power of the indoor fan, the maximum pipe temperature of the outdoor heat exchanger within the first preset time of startup operation of the air conditioner is obtained to serve as a first temperature value, and the pipe temperature of the outdoor heat exchanger is obtained every second preset time after the first preset time to serve as a second temperature value; the absolute value of the difference value between the first temperature value and the second temperature value is calculated, and whether the indoor heat exchanger is frozen or not is judged according to the absolute value; and if the indoor heat exchanger is frozen, antifreezing protection control is carried out on the air conditioner. According to the method, by detecting the power of the indoor fan and the pipe temperature of the outdoor heat exchanger of the air conditioner jointly, whether the air conditioner is frozen or not can be judged accurately, the refrigeration effect of the air conditioner is ensured, and user experience is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an anti-freezing control method of an air conditioner and an air conditioner. Background technique [0002] At present, when the air conditioner is used in some special occasions, such as operating in cooling mode when the outdoor ambient temperature is relatively low, the indoor heat exchanger in the air conditioner is prone to frost and ice, thereby affecting the normal operation of the air conditioner. Usually, when there is frost and ice on the indoor heat exchanger, the air conditioner will perform the anti-freeze protection function. The function of the anti-freezing protection in the air conditioner is to prevent the temperature of the indoor heat exchanger tube from being too low, causing liquid refrigerant to enter the compressor, causing the compressor to be compressed and damaged. [0003] In the related art, when the air conditioner is running in cooling mod...

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Problems solved by technology

[0005] However, in actual use, when the indoor and outdoor temperature difference is small or the evaporator is seriously blocked, the air conditioner only takes into account the tube temperature of the indoor heat exchanger when judging whether the indoor unit enters or exits the anti-freezing protection. The relationship between the size and the preset value is too simple to judge, and it is easy to cause a wrong judgment that there is no ice on the indoor heat exchanger but it enters the anti-freeze protection

On the one hand, this kind of misjudgment will mislead the maintenance work of the maintenance personnel, and on the other hand, it will reduce the comfort of the user.

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