Rotating fluid machine

Abstract

A rotary valve of a rotating fluid machine is constructed by bringing into contact, on sliding faces which are orthogonal to an axis, a moving valve plate provided on a rotor and a stationary valve plate provided on a valve body. An annular member pivotably supports the valve body by a fulcrum shaft. The annular member has a pair of projections at its two ends. The pair of projections are engaged slidably in the direction of the axis with a pair of guide grooves formed in a rear cover. When the valve body is pressed in the direction of the axis to bring the sliding faces into close contact with each other, the pair of projections receive a uniform frictional resistance from the guide grooves, so that the annular member is prevented from inclining off a plane orthogonal to the axis. Therefore, the compliance of the sliding faces can be secured to prevent a working medium from leaking and to suppress uneven wear of the sliding faces.

What is claimed is:  
     
         1 . A rotating fluid machine comprising: 
 a casing;    a rotor rotatably supported by the casing;    a working section disposed on the rotor; and    a rotary valve, provided between the casing and the rotor, for controlling the supply and discharge of a working medium to and from the working section,    the rotary valve being constructed by bringing, into contact on sliding faces which are orthogonal to an axis of the rotor, a moving valve plate provided on the rotor and a stationary valve plate provided on a valve body engaged with the casing to be unable to rotate and movable in the direction of the axis,    wherein two projections are provided in a first radial direction at two ends of an annular member loosely fitted onto the outer circumference of the valve body, and engaged slidably in the direction of the axis with guide grooves formed in the casing, and    wherein the valve body is pivotably supported on the annular member via a fulcrum shaft arranged in a second radial direction orthogonal to the first radial direction.    
     
     
         2 . The rotating fluid machine according to  claim 1 , wherein the two projections of the annular member can slide with respect to the guide grooves of the casing in the first radial direction, and the valve body can slide along the fulcrum shaft in the second radial direction.