Freezing and Refrigerating Device and Defrosting Control Method thereof

Abstract

A freezing and refrigerating device comprises a box body and a door body. An air supply path supplying cooling air flow to a storage compartment, an air return path enabling the air flow from the storage compartment to pass, a cooling chamber and an air discharging path are defined in the box body, wherein the cooling chamber communicates with the air supply path and the air return path, and contains an evaporator, a blower and a defrosting heater, and the air discharging path communicates with the cooling chamber and an ambient space. The air supply path and the air discharging path are respectively provided with an air supply door and an air discharging door for selectively connecting or blocking the air supply path and the air return path. The present invention further provides a defrosting control method of the freezing and refrigerating device.

1 . 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 communicates with the air supply path and the air return path, and contains an evaporator for cooling the air entering the cooling chamber from the air return path, a blower for driving the air inside the cooling chamber to flow towards the air supply path and a defrosting heater provided on the evaporator; and   an air discharging path communicating with the cooling chamber and an ambient space so that the air in the cooling chamber is directly discharged to the ambient space; wherein   the air supply path and the air return path are respectively provided with an air supply door and an air discharging door for selectively connecting or blocking the air supply path and the air return path.   
     
     
         2 . The freezing and refrigerating device of  claim 1 , wherein the air discharging path is provided with an air discharging pump therein for driving the air in the cooling chamber to flow towards the ambient space. 
     
     
         3 . The freezing and refrigerating device of  claim 1 , wherein one end of the air discharging path communicating with the cooling chamber is located downstream of the blower in the air flowing direction. 
     
     
         4 . The freezing and refrigerating device of  claim 1 , wherein the at least one storage compartment comprises a refrigerating compartment and a freezing compartment that are provided in a vertical direction relative to each other, and the cooling chamber is located behind the freezing compartment and is separated therefrom by a rear cover plate of the freezing compartment. 
     
     
         5 . The freezing and refrigerating device of  claim 4 , wherein the air supply path comprises a refrigerating air feeding passage located behind the refrigerating compartment and a freezing air inlet provided at the rear cover plate of the freezing compartment, and the air supply door comprises a refrigerating air feeding door provided inside the refrigerating air feeding passage and a freezing air feeding door provided at the freezing air inlet. 
     
     
         6 . The freezing and refrigerating device of  claim 4 , wherein the air return path comprises a refrigerating air return passage, which extends from the bottom of the refrigerating compartment to an air return opening part of the cooling chamber and intersects with the air discharging path; and
 the air discharging door is provided at an intersection of the refrigerating air return passage and the air discharging path, such that when the air discharging door is in a first state, the refrigerating air return passage is connected and the air discharging path is blocked, and when the air discharging door is in a second state, the refrigerating air return passage is blocked and the air discharging path is connected.   
     
     
         7 . The freezing and refrigerating device of  claim 1 , wherein a top of the evaporator is provided with a first temperature sensor to detect a temperature of the top of the evaporator. 
     
     
         8 . The freezing and refrigerating device of  claim 1 , wherein the defrosting heater is provided on the bottom of the evaporator and faces a groove provided in the bottom of the cooling chamber, such that defrosting water generated during defrosting flows into a water collecting box provided at the bottom of the box body via a water discharging pipe communicating with the groove. 
     
     
         9 . A defrosting control method of a freezing and refrigerating device of  claim 1 , the method comprising:
 step A: receiving a defrosting signal instructing the evaporator of the freezing and refrigerating device to perform defrosting;   step B: starting the defrosting heater located on the evaporator;   step C: closing the air supply door located in the air supply path of the freezing and refrigerating device to block the air supply path; and   step D: opening the air discharging door located in the air discharging path of the freezing and refrigerating device to connect the air discharging path, such that hot air generated by the defrosting heater when performing heating and defrosting is directly discharged to the ambient space via the air discharging path.   
     
     
         10 . The defrosting control method of  claim 9 , after the step D, further comprising: step E: starting the air discharging pump in the air discharging path to drive the hot air in the cooling chamber to be discharged to the ambient space via the air discharging path. 
     
     
         11 . The defrosting control method of  claim 10 , after the step E, further comprising: step F: when the temperature of the top of the evaporator reaches a first predetermined temperature, stopping the defrosting heater. 
     
     
         12 . The defrosting control method of  claim 11 , after the step F, further comprising: step G: when the defrosting heater is stopped for a predetermined time period, closing the air discharging pump and the air discharging door.