| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat pump device capable of preventing lubricating oil from running off from within the shell of a lower-stage-side compressor while avoiding reduction of startability.SOLUTION: A heat pump device comprises: a use-side heat exchanger (33) and a heat-source-side heat exchanger (37); a lower-stage-side compressor (31) including a shell containing lubricating oil and compressing refrigerant delivered from the use-side heat exchanger (33) or the heat-source-side heat exchanger (37); an upper-stage-side compressor (32) compressing the refrigerant delivered from the lower-stage-side compressor (31); an opening adjustment unit (34) provided on a refrigeration circuit (21) to which the refrigerant delivered from the upper-stage-side compressor (32) flows, and capable of adjusting the opening of the refrigeration circuit (21); and a control unit (50) executing, at a time of terminating the operation of the heat pump device, a step of stopping actuation of the lower-stage-side compressor (31) while causing the opening adjustment unit (34) to reduce the opening of the refrigeration circuit (21), and a step of subsequently stopping actuation of the upper-stage-side compressor (32).</p> |
