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A refrigerator comprising a refrigeration cycle which comprises a compressor, condenser, first capillary tube and first cooler connected into a loop, and a quick freezing refrigerant circuit connected in parallel with the first cooler and comprising a second capillary tube and a second cooler connec

A refrigerator comprising a refrigeration cycle which comprises a compressor, condenser, first capillary tube and first cooler connected into a loop, and a quick freezing refrigerant circuit connected in parallel with the first cooler and comprising a second capillary tube and a second cooler connected in series therewith. The refrigerant is passed through the first cooler for usual operation, or alternatively through the quick freezing circuit for quick freezing. During quick freezing, the first cooler is held out of operation, and the refrigerant has its pressure reduced in two steps by the first and second capillary tubes and is evaporated in the second cooler only, giving a low temperature effective for quick freezing. During usual operation, no refrigerant flows into the second cooler, which therefore remains free of frosting. The frost deposited on the second cooler during quick freezing disappears during the usual operation. Thus, the second cooler is substantially free from frost.

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A refrigeration device comprising: a compartment, a refrigeration cycle comprising a compressor, a condenser, a first capillary tube and a first cooler connected with a refrigerant channel into a loop for circulating a refrigerant therethrough, a quick freezing refrigerant circuit connected in paral

A refrigeration device comprising: a compartment, a refrigeration cycle comprising a compressor, a condenser, a first capillary tube and a first cooler connected with a refrigerant channel into a loop for circulating a refrigerant therethrough, a quick freezing refrigerant circuit connected in parallel with the first cooler and comprising a second capillary tube and a second coller connected in series therewith, the circuit having a junction for connection to the refrigerant channel from the first capillary tube to the first cooler, a change-over valve provided in the refrigerant channel between the junction and the first cooler inclusive of the junction for changing a flow of the refrigerant toward the first cooler to a flow of the refrigerant toward the second cooler, means for supplying air cooled by the first cooler to the compartment, and control means for driving the compressor, the means for supplying air and the change-over valve, control means for driving the compressor, the fan and the change-over valve, the second cooler being disposed within the compartment, the refrigerant being supplied to the first cooler for usual refrigeration to cool the compartment, the refrigerant being supplied to the second cooler for quick freezing to freeze an article to be frozen in contact with the second cooler, said control means including a temperature sensor for detecting the temperature of the article, a temperature sensor for detecting the ambient temperature, a timer, a mode selector for selecting a mode corresponding to the ambient temperature from among a plurality of operation modes having set therefor the temperature of the article at which the change-over valve is to be driven and varying periods of supply of the refrigerant to the first and second coolers, and a controller for controlling the change-over valve in accordance with the selected operation mode.