DEVICE FOR REFRIGERATING CYCLE

PURPOSE:To make it possible to operate a refrigerating cycle which has a plurality of evaporation temperatures with a high energy consumption efficiency by controlling the coolant flowing in a flow channel switching channel and providing a flow channel switch device which switches flow channel to the direction in which either one of a second evaporator or evaporator in refrigerating cycle and the suction side of a compressor on a low stage side are in communication. CONSTITUTION:When a refrigerating chamber and cold storage chamber are both cooled, two-way solenoid valves 13 and 5 are changed over to opening and an one-way solenoid valve 14 to closing by the instruction of a control section 16. Liquid coolant of low pressure which is reduced in its pressure by a pressure reducing device 7 for refrigeration is supplied to an evaporator 8 for refrigeration, and liquid coolant of intermediate pressure which is reduced in its pressure by a pressure reducing device 11 for cold storage is supplied to an evaporator 10. With this arrangement the evaporator 8 for refrigeration evaporates at evaporation temperature which responds to the low pressure coolant and the evaporator 10 for cold storage evaporates at evaporation temperature which responds to the intermediate pressure. By the way the coolant of intermediate pressure that evaporates in the evaporator 10 for cold storage is sucked into a second compressor section 4 and the coolant of low pressure that evaporates in the evaporator 8 for refrigeration is sucked into a first compressor section 3. Consequently an efficient operation is achieved because evaporation is made at most suitable temperature for refrigeration and cold storage.