| 摘要 |
PROBLEM TO BE SOLVED: To provide a dual refrigeration cycle device in which reliability is improved while suppressing dilution by a refrigerant and retaining high viscosity by speedily raising temperature of a lubricant to be collected to a high-temperature-side compressor in the case of activation, which can be shifted to safety operation in a short time, and in which motor efficiency can be improved by cooling the high-temperature-side compressor to suppress overheat of a sliding part when the safety operation is continued for a long time.SOLUTION: In the dual refrigeration cycle device, refrigerator piping from a low-temperature-side compressor of a low-temperature-side refrigeration cycle through a cascade heat exchanger to a low-temperature-side expansion device is used as a low-temperature-side high pressure part and in the low-temperature-side high pressure part, a heat exchange part is provided which extends to a high-temperature-side compressor forming a high-temperature-side refrigeration cycle and exchanges heat of a low-temperature-side refrigerant to the high-temperature-side compressor. |
