| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent energy saving effect during compression operation, in a screw compressor wherein an internal volume ratio is regulated by a slide valve mechanism. SOLUTION: In a screw compressor wherein an internal volume ratio is regulated by a slide valve 2 mechanism, an internal volume ratio Via determined by an axial port 20 is increased to a value higher than an internal volume ratio Vir determined by a radial port 21. Further, on a condition that the internal volume ratio Via is Via=4.0, the internal volume ratio Vir is 4.0<Vir<=6.0.
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