Defrosting method for air conditioner and defrosting device for air conditioner

A defrosting device for an air conditioner, wherein the air conditioner comprises a compressor and a four-way valve, and the device comprises:

• an acquiring module, configured to acquire outdoor temperature and outdoor humidity if the air conditioner enters a defrosting mode;
• a controlling module, configured to judge whether the outdoor temperature is lower than a preset temperature and the outdoor humidity is higher than a preset humidity;
• and control an outdoor fan to rotate reversely according to tube temperature of an outdoor heat exchanger and a period when the air conditioner operates in the defrosting mode, so as to defrost a protecting housing surrounding the outdoor heat exchanger, in response to judging that the outdoor temperature is lower than the preset temperature and the outdoor humidity is higher than the preset humidity;
• wherein the controlling module is further configured to:
• control the outdoor fan to rotate reversely in response to determining that the tube temperature is higher than a difference between preset temperature for exiting from the defrosting mode and a first temperature threshold;
• or
• control the outdoor fan to rotate reversely in response to determining that the period when the air conditioner operates in the defrosting mode reaches a difference between a preset defrosting period and a first period threshold.

An air conditioner, comprising:

• a compressor;
• a four-way valve;
• and
• a defrosting device for defrosting the air conditioner, said defrosting device comprising:
• an acquiring module, configured to acquire outdoor temperature and outdoor humidity if the air conditioner enters a defrosting mode;
• a controlling module, configured to judge whether the outdoor temperature is lower than a preset temperature and the outdoor humidity is higher than a preset humidity;
• and control an outdoor fan to rotate reversely according to tube temperature of an outdoor heat exchanger and a period when the air conditioner operates in the defrosting mode, so as to defrost a protecting housing surrounding the outdoor heat exchanger, in response to judging that the outdoor temperature is lower than the preset temperature and the outdoor humidity is higher than the preset humidity;
• wherein the controlling module is further configured to:
• control the outdoor fan to rotate reversely in response to determining that the tube temperature is higher than a difference between preset temperature for exiting from the defrosting mode and a first temperature threshold;
• or
• control the outdoor fan to rotate reversely in response to determining that the period when the air conditioner operates in the defrosting mode reaches a difference between a preset defrosting period and a first period threshold.