| 摘要 |
The invention deals with a globoid-worm machine such as a compressor or expansion machine for varying the pressure of a fluid, which comprises a globoid worm having a plurality of threads in meshing relation with at least one transverse pinion and rotatably mounted within a stationary casing which is applied in leak-tight manner against at least part of the external surface of the worm and which has main ports for connecting the interior of said casing respectively to a fluid admission chamber and to a fluid discharge chamber. The casing is provided with a plurality of auxiliary ports which connect the interior of said casing to said discharge chamber and are fitted with movable means for leak-tight closure.
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