| 摘要 |
The invention relates to a rotor machine, and then particularly to a helical screw rotor machine which has at least one rotor that is provided with trunnions, of which at least one (7) has an axial thrust surface (29) located in a chamber (17) filled with pressure medium and actuated axially by said pressure medium. It is necessary that the pressure medium chamber connects sealingly with the trunnion (7). This is achieved in accordance with the invention by placing around the trunnion, with a close fit, a casing (20, 21) that has an outer end which is connected to a bottom wall (21) that includes a hole (22) in its centre. The casing is rotatably and slidably mounted on the trunnion and is movable axially between a first axial position in which the bottom wall (21) is in abutment with an end wall (23) of said chamber (17), said end wall having an opening (24) disposed opposite the centre hole (22) in said bottom wall, and a second axial position with an interspace to said end wall (23), wherein a supply channel (26) provided with a valve (27) and extending from a pressure medium source (28) is connected to said opening (24) in the end wall (23) for controlled delivery of pressure medium to the interior of the casing (20, 21) via the hole (22) in the bottom wall (21) of said casing.
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