| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency by making low the temperature if the discharge gas refrigerant of a high-stageside compression means, and at the same time, by reducing the time until a circuit becomes stable at the beginning of the activation a refrigerating device. SOLUTION: In this multi-stage compression refrigerating machine, a refrigerant from a condenser 1 is divided, one refrigerant is allowed to flow from a first pressure reduction means 3 to an intercooler 6, the other is allowed to flow from a second pressure reduction means 7 to an evaporator 8, the refrigerant flowing into the second pressure reduction means 7 is subjected to heat exchange with the intercooler 6, at the same time, the refrigerant flowing out of the evaporator 8 is sucked into a low-stageside compression means 32, and the discharge refrigerant of the intercooler 6 is merged with that of the low- stageside compression means 32 for sucking into a high-stage-side compression means 34. In this case, the elimination capacity of the low-stageside compression means 32 is set to a value larger than that of the high-side compression means 34, and at the same time, a unidirectional valve 9 for allowing only the flow of the refrigerant from the intercooler 6 in the direction of a junction 106 is provided between the intercooler 6 and the junction 106.
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