| 摘要 |
PROBLEM TO BE SOLVED: To restrain a heat radiating loss by this refrigerating device.SOLUTION: An air conditioning apparatus 1 includes a four-stage compressor 2, switching mechanisms 31-33, intercoolers 51-53, oil separators 41-43 and a control part. In the four-stage compressor 2, four compression mechanisms 21-24 are connected in series. The switching mechanisms 31-33 are connected to delivery pipes 101b-103b of the compression mechanisms 21-23. The switching mechanisms 31-33 switch a cooling operation cycle and a heating operation cycle. The intercoolers 51-53 cool a refrigerant delivered from the compression mechanisms 21-23 in the cooling operation cycle. The oil separators 41-43 are arranged between the switching mechanisms 31-33 and the intercoolers 51-53. The oil separators 41-43 separate lubricating oil from the refrigerant delivered from the compression mechanisms 21-23 in the cooling operation cycle. The control part controls the four-stage compressor 2 and the switching mechanisms 31-33. |
