FREEZING DEVICE USING HFC NON-AZEOTROPIC REFRIGERANT MIXTURE

PROBLEM TO BE SOLVED: To provide a freezing device having a defrosting circuit capable of defrosting in a short time and pumping down by using an HFC non-azeotropic refrigerant mixture, as a refrigerant, including a low boiling point refrigerant with no risk to deplete an ozone layer and a high boiling point refrigerant having a boiling point higher than that of the former. SOLUTION: Since a low boiling point refrigerant at a high temperature enters from a compressor 1 to an evaporator 10, during a defrosting operation, the rise of temperature of the evaporator 10 can be accelerated. Further, the low boiling point refrigerant liquefied in the evaporator 10 during the defrosting operation is recovered to a liquid receiver 4 via an inlet pipe 19 and a part of the low boiling point refrigerant guided to the liquid receiver 4 is guided to the compressor 1 via the gas outlet pipe 19 and enters the evaporator 10. Thus, a time of pumping down operation for removing the refrigerant in the evaporator 10 can be shortened.