Rotary fluid machine

Abstract

A rotary fluid machine is provided that includes a rotor rotatably housed within a casing, a hollow rotating shaft ( 113 ) that rotates integrally with the rotor, and a fixed shaft ( 102 ) that is relatively rotatably fitted into the inner periphery of the rotating shaft ( 113 ); wherein the fixed shaft ( 102 ) is floatingly supported in the casing via a fixed shaft support spring ( 95 ) having an alignment action. When rotational runout of the rotor is transmitted to the fixed shaft ( 102 ) via the rotating shaft ( 113 ), the alignment action of the fixed shaft support spring ( 95 ) suppresses the rotational runout of the rotor, and any increase in the frictional resistance in a sliding section between the rotating shaft ( 113 ) and the fixed shaft ( 102 ) and the occurrence of abnormal wear can be prevented effectively, and the leakage of steam from a rotary valve (V) provided on the sliding surfaces of the rotating shaft ( 113 ) and the fixed shaft ( 102 ) can be reduced.

1 . A rotary fluid machine comprising a rotor ( 41 ) rotatably housed within a casing ( 11 ), a hollow rotating shaft ( 113 ) that rotates integrally with the rotor ( 41 ), and a fixed shaft ( 102 ) that is relatively rotatably fitted into the inner periphery of the rotating shaft ( 113 ), 
 characterized in that the fixed shaft ( 102 ) is floatingly supported in the casing ( 11 ) via resilient support means ( 95 ) having an alignment action.    
   
   
       2 . The rotary fluid machine according to  claim 1 , wherein a rotary valve (V) for controlling supplying and discharging of a high temperature gas-phase working medium is provided on sliding surfaces of the rotating shaft ( 113 ) and the fixed shaft ( 102 ).