| 摘要 |
A refrigeration circuit (11) has a compressor (20) and an expander (30) separately. An expander casing (34) is connected to a discharge tube (26) of the compressor (20) and a high-pressure refrigerant passes through the inside of the expander casing. Accordingly the inside of a compressor casing (24) and the inside of the expander casing (34) are equalized in pressure. An oil amount adjustment valve (52) is provided in an oil flow tube (41) connecting oil containers (27, 37) of the compressor (20) and the expander (30). The oil amount adjustment valve (52) is operated based on an output signal from an oil level sensor (51). When the oil amount adjustment valve (52) is opened, the oil container (27) in the compressor casing (24) and the oil container (37) in the expander casing (34) are interconnected with each other and refrigeration machine oil moves through the oil flow tube (41). ® KIPO & WIPO 2009
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