Rotary fluid machine

Abstract

A rotary fluid machine is provided that includes a rotor chamber ( 14 ) formed in a casing, a rotor ( 41 ) rotatably housed within the rotor chamber ( 14 ), a plurality of vane channels ( 49 ) formed radially in the rotor ( 41 ), a plurality of vanes ( 48 ) slidably supported in the respective vane channels ( 49 ), vane chambers ( 75 ) defined between adjacent vanes ( 48 ), and an intake port ( 90 ) and an exhaust port ( 91 ) for supplying and discharging a gas-phase working medium to and from the vane chambers ( 75 ). A labyrinth ( 43 g ) provided on the outer peripheral face of the rotor ( 41 ) prevents the gas-phase working medium from leaking in a region in which there is a large difference in pressure between adjacent vane chambers ( 75 ) that are in between the trailing edge of the exhaust port ( 91 ) and the leading edge of the intake port ( 90 ).

1 . A rotary fluid machine comprising a rotor chamber ( 14 ) formed in a casing ( 11 ), a rotor ( 41 ) rotatably housed within the rotor chamber ( 14 ), a plurality of vane channels ( 49 ) formed radially in the rotor ( 41 ), a plurality of vanes ( 48 ) slidably supported in the respective vane channels ( 49 ), vane chambers ( 75 ) defined by the rotor ( 41 ), the casing ( 11 ), and the vanes ( 48 ), and an intake port ( 90 ) and an exhaust port ( 91 ) for supplying and discharging a gas-phase working medium to and from the vane chambers ( 75 ); 
 characterized in that gas-phase working medium leakage preventing means is provided on at least one of the outer peripheral face of the rotor ( 41 ) and the inner peripheral face of the rotor chamber ( 14 ) in a region in which there is a large difference in pressure between adjacent vane chambers ( 75 ) that are in between the trailing edge of the exhaust port ( 91 ) and the leading edge of the intake port ( 90 ).    
   
   
       2 . The rotary fluid machine according to  claim 1 , wherein the leakage preventing means is a labyrinth ( 43   g ).