Freezing and Refrigerating Device and Defrosting Control Method Thereof

A freezing and refrigerating device, comprising a box body and a door body pivotably connected to the box body, wherein inside the box body are defined:

• at least one storage compartment for storing articles;
• an air supply path configured to supply cooling air flow to the at least one storage compartment;
• an air return path configured to allow the air flow from the at least one storage compartment to pass;
• a cooling chamber which comprises an air feeding opening part allowing air inside the cooling chamber to flow to the air supply path and an air return opening part allowing air from the air return path to enter, and contains an evaporator for cooling the air entering the cooling chamber from the air return opening part, a blower for driving the air inside the cooling chamber to flow towards the air feeding opening part, and a defrosting heater provided on the evaporator;
• and
• a defrosting air return path located behind the cooling chamber and communicating with the air feeding opening part and the air return opening part of the cooling chamber;
• wherein
• the air supply path and the defrosting air return path are provided with an air supply door and a defrosting air return door respectively to selectively connect or block the air supply path and the defrosting air return path.