| 摘要 |
Fixed throttle devices 36A, 36B, 36C, 36D are screw-engaged with a rotor housing 12. A fixed throttle device 37 is screw-engaged with a front housing 13, and a fixed throttle device 38 is screw-engaged with a rear housing 14. Inert gas is supplied to the respective throttle devices 36A, 36B, 36C, 36D, 37 and 38 via branch pipes 54 to 59. Each of the throttle devices 36A, 36B, 36C, 36D, 37 and 38 includes a check valve 44, a fixed throttle 45 screw-engaged with the check valve 44, and a pipe joint 46 screw-engaged with the check valve 44.
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