| 摘要 |
An air-conditioning apparatus (1) uses carbon dioxide as a refrigerant, and has a two-stage compression-type compression mechanism (2), a heat source-side heat exchanger (4), an expansion mechanism (5), a usage-side heat exchanger (6), an intercooler (7) which is provided to an intermediate refrigerant tube (8) for drawing refrigerant discharged from a first-stage compression element into a second-stage compression element and which functions as a cooler of refrigerant discharged from the first-stage compression element and drawn into a second-stage compression element, and an intermediate oil separation mechanism (16) for separating from the refrigerant a refrigeration oil that accompanies the refrigerant discharged from the first-stage compression element and for returning the refrigeration oil to the intake side of the compression mechanism (2), the intermediate oil separation mechanism being provided to a section of the intermediate refrigerant tube (8) between the first-stage compression element and an inlet of the intercooler (7).
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