REFRIGERATING APPARATUS

摘要

A refrigerating apparatus includes a high-temperature side circuit and a low-temperature side circuit connected to each other via a cascade condenser, a low-temperature side second flow control valve that turns a refrigerant, passing through a liquid pipe connecting between a cooling unit and other circuit parts in a low-temperature side circuit b, into a gas-liquid two-phase refrigerant, and an expansion tank connected to the suction side of a low-temperature circuit compressor via a tank electromagnetic valve.

主权项

1. A refrigerating apparatus comprising:
a high-temperature side circuit including a high-temperature circuit compressor, a high-temperature circuit condenser, a high-temperature side expansion valve, and a high-temperature circuit evaporator of a cascade heat exchanger, the high-temperature side circuit being configured for a high-temperature circuit refrigerant to circulate therein; a low-temperature side circuit including a low-temperature side heat source circuit including a low-temperature circuit compressor, a low-temperature circuit condenser of the cascade heat exchanger, and a receiver, and a cooling unit including a first flow control valve and a low-temperature circuit evaporator connected in series to each other, the low-temperature side circuit being configured by connecting the low-temperature side heat source circuit and the cooling unit via a liquid pipe for supplying the refrigerant from the low-temperature side heat source circuit to the cooling unit and a gas pipe for supplying the refrigerant from the cooling unit to the low-temperature side heat source circuit, the low-temperature side circuit being configured for a low-temperature circuit refrigerant to circulate therein; a second flow control valve provided at an outlet of the receiver to depressurize the refrigerant flowing out of the receiver and supply the refrigerant to the liquid pipe in a gas-liquid two-phase state; and an expansion tank connected to a suction side of the low-temperature circuit compressor in the low-temperature side circuit via a tank electromagnetic valve and configured to suppress an increase in pressure in the low-temperature side circuit during a non-operation period.