Abstract: A refrigerator has a refrigerating cycle sequentially connecting a compressor, a condenser, a drawing mechanism, and evaporator, an accumulator, an inlet temperature sensor and an outlet temperature sensor for detecting the temperatures of the inlet and outlet of the evaporator, and a cooling fan for cooling the compressor. When the difference between the temperature detected by the inlet temperature sensor and the temperature detected by the outlet temperature sensor is a predetermined value or more, the cooling fan is stopped.

Abstract: A motor control unit 107 that controls a drive device 100 of a brushless DC motor 101 of a compressor 12 in a refrigerator 1 determines that a flammable refrigerant is not leaking when it is determined that a duty variation width A(t) of a duty value D(t) detected at a detection time t exceeds a reference duty variation width Aa of a duty value D(t0) measured at a duty measurement reference time t0 and a voltage value time rate-of-change ?V of a voltage value V(t) of direct-current power exceeds a reference rate-of-change ?Va.

Abstract: A motor control unit 107 that controls a drive device 100 of a brushless DC motor 101 of a compressor 12 in a refrigerator 1 determines that a flammable refrigerant is not leaking when it is determined that a duty variation width A(t) of a duty value D(t) detected at a detection time t exceeds a reference duty variation width Aa of a duty value D(t0) measured at a duty measurement reference time t0 and a voltage value time rate-of-change ?V of a voltage value V(t) of direct-current power exceeds a reference rate-of-change ?Va.

Abstract: A refrigerator has a refrigerating cycle sequentially connecting a compressor, a condenser, a drawing mechanism, and evaporator, an accumulator, an inlet temperature sensor and an outlet temperature sensor for detecting the temperatures of the inlet and outlet of the evaporator, and a cooling fan for cooling the compressor. When the difference between the temperature detected by the inlet temperature sensor and the temperature detected by the outlet temperature sensor is a predetermined value or more, the cooling fan is stopped.

Abstract: A refrigerator-freezer is described, in which refrigerant leakage from the refrigeration cycle can be safely detected. The refrigerator-freezer comprises: a refrigeration cycle formed by a compressor, a capillary, an evaporator and an accumulator connected in series, and filled with a flammable refrigerant; a cooling fan configured to blow the cold air cooled by the evaporator in the refrigerator-freezer; and a refrigerant leakage detection system configured to detect leakage of the flammable refrigerant, wherein the refrigerant leakage detection system is provided with a temperature sensor configured to measure the temperature of a refrigerant conduit of the evaporator and judges that the flammable refrigerant is leaking in the low pressure side of the refrigeration cycle when the temperature is detected by the temperature sensor with the compressor being halted is no lower than a predetermined temperature.