| 摘要 |
PROBLEM TO BE SOLVED: To provide a refrigeration device capable of ensuring separating a gas-liquid two-phase refrigerant at an intermediate pressure into a gas phase and a liquid phase.SOLUTION: An overcooling heat exchanger 91 causes heat exchange between refrigerant resulting from the merge of the refrigerant that is a part of the refrigerant taken out from a liquid phase part of a receiver 81 and that is subjected to pressure reduction by an overcooling expansion valve 92 with the refrigerant taken out from a gas phase part of the receiver 81 and that is subjected to the pressure reduction by a separation gas expansion valve 82 and the other part of the refrigerant taken out from the liquid phase part of the receiver 81. A liquid-gas heat exchanger 61 causes heat exchange between the refrigerant resulting from the merge of the refrigerant evaporated by first and second indoor heat exchangers 12a and 13a with the refrigerant flowing in an overcooling injection piping element 93 and the refrigerant directed from an economizer heat exchanger 51 to an expansion mechanism 70. A control unit 7 controls one of the first and second indoor expansion valves 12b and 13b, the overcooling expansion valve 92, and the separation gas expansion valve 82 so as to ensure a degree of overheating of the merged refrigerant flowing at a low-pressure-side inlet of the liquid-gas heat exchanger 61. |
