| 摘要 |
PROBLEM TO BE SOLVED: To perform efficient operation by reducing a burden of one-stage side and two-stage side compressors in response to a change in the evaporation temperature. SOLUTION: This two-stage screw compressor has a stroke volume ratio adjusting means 28 for adjusting the stroke volume ratio of the one-stage side compressor 1 and the two-stage side compressor 10 by changing at least any stroke volume of the one-stage side compressor 7 and the two-stage side compressor 10 by a capacity variable means 18 in response to a change in suction pressure and a capacity adjusting means 28 for adjusting capacity by changing a rotating speed of a motor 12 by a rotation control means 26. COPYRIGHT: (C)2007,JPO&INPIT
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