| 摘要 |
<p>An air conditioning device (1) is provided with a four-stage compressor (2), switching mechanisms (31-33), intercoolers (51-53), oil separators (41-43), and a control unit. The four-stage compressor (2) has four compression mechanisms (21-24) interconnected in series. The switching mechanisms (31-33) are connected to the discharge pipes (101b-103b) of the compression mechanisms (21-23). The switching mechanisms (31-33) switch between a cooling operation cycle and a heating operation cycle. During the cooling operation cycle, the intercoolers (51-53) cool a refrigerant discharged from the compression mechanisms (21-23). The oil separators (41-43) are installed between the switching mechanisms (31-33) and the intercoolers (51-53). During the cooling operation cycle, the oil separators (41-43) separate lubricating oil from the refrigerant discharged from the compression mechanisms (21-23). The control unit controls the four-stage compressor (2) and the switching mechanisms (31-33).</p> |
