| 摘要 |
PROBLEM TO BE SOLVED: To provide a dual refrigeration cycle device in which reliability is improved by suppressing dilution by a refrigerant and improving viscosity by speedily raising temperature of a lubricant to be collected in a high-temperature-side compressor in the case of activation, which is capable of shifting to safety operation in a short time and in which reliability 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: The dual refrigeration cycle device comprises an auxiliary circuit forming a refrigeration cycle by communicating an auxiliary compressor, a four-way switching valve, a utilization-side heat exchanger, an auxiliary expansion device and a heat-source-side heat exchanger via a refrigerant piping. The utilization-side heat exchanger is provided to exchange heat with at least one of a high-temperature-side compressor forming a high-temperature-side refrigeration cycle and a low-temperature-side compressor forming a low-temperature-side refrigeration cycle. |
