HOT GAS DEFROSTING TYPE REFRIGERATING/COLD STORAGE UNIT

摘要

PROBLEM TO BE SOLVED: To obtain a hot gas defrosting type refrigerating/cold storage unit which can surely close a solenoid valve installed to a by-pass pipe after a defrosting mode ends even when the electromagnetic coil of the valve is not increased in size. SOLUTION: In a cooling mode, a refrigerant gas is circulated through the main pipeline 1 of this refrigerating/cold storage unit. The cooling operation of this unit is performed by evaporating a high-pressure liquefied refrigerant gas produced by compressing the refrigerant gas by means of a compressor 2 and liquefying the compressed gas by means of a condenser 3 by means of an evaporator 6 after the pressure of the refrigerant gas is lowered by means of an expanding section 5. In a defrosting mode, the evaporator 6 is defrosted by directly sensing the high-temperature high-pressure refrigerant gas sent from the refrigerant outlet 2a side of the compressor 2 to the refrigerant inlet 6a side of the evaporator 6 through the by-pass pipe 8 and solenoid valve 9. When the defrosting mode ends, the operation of the compressor 2 is stopped after the closing operation of the solenoid valve 9 is completed.