Patent ID: 8176743

Claim:
A refrigeration device comprising: a compression mechanism configured to compress a refrigerant; a radiator connected to a refrigerant discharge side of said compression mechanism; a first expansion mechanism connected to an exit side of said radiator; a refrigerant cooling unit disposed between the exit side of said radiator and a refrigerant inflow side of said first expansion mechanism; a liquid receiver connected to a refrigerant outflow side of said first expansion mechanism; a second expansion mechanism connected to an exit side of said liquid receiver; an evaporator connected to a refrigerant outflow side of said second expansion mechanism and to a refrigerant intake side of said compression mechanism; a high-pressure sensor provided to the refrigerant discharge side of the compression mechanism; a temperature sensor provided in a vicinity of the exit side of the radiator; an intermediate-pressure sensor provided between the first expansion mechanism and the liquid receiver; and a control unit configured to perform refrigerant cooling control, the control unit including a control switching section for switching between the refrigerant cooling control and normal control, the control unit controlling a degree of opening of the first and second expansion mechanisms during the normal control so that a COP is enhanced, and the control unit controlling refrigerant cooling by the refrigerant cooling unit during the refrigerant cooling control by controlling the degree of opening of the first and second expansion mechanisms based on at least a pressure detected by the intermediate-pressure sensor so that the refrigerant that has flowed out of the first expansion mechanism is in a state near the saturation line and at a pressure equal to or less than a critical pressure minus 0.3 MPa.