Two-stage compression refrigeration cycle
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United States of America Patent
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Jul 2, 2019
Grant Date -
Jul 26, 2018
app pub date -
Mar 17, 2016
filing date -
Sep 1, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A two-stage pressurizing refrigeration cycle is provide with a suction-side guiding portion in a part of a low-stage side suction pipe that leads from a bypass branch portion, at which a bypass pipe is branched, to a refrigerant suction side of a low-stage compressor. The suction-side guiding portion guides a lubricating oil from the refrigerant suction side of the low-stage side compressor to a side of the bypass branch portion. The suction-side guiding portion is located at a position in a vertical direction that is equal to or higher than apposition in the vertical direction of the bypass branch portion, and a part of the suction-side guiding portion on the refrigerant suction side of the low-stage side compressor is located at a higher position in the vertical direction than a part of the suction-side guiding portion on the side of the bypass branch portion.
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