Rotating fluid machine

Abstract

A rotary valve of a rotating fluid machine is constructed by bringing, into contact on sliding faces, a moving valve plate and a stationary valve plate, and high pressure working medium passages and low pressure working medium passages penetrate mating faces of a valve body and the stationary valve plate. By sealing the outer circumference of the mating faces with a first sealing member and sealing the circumference of the low pressure working medium passages with a second sealing member inside the first sealing member in the radial direction, the pressure of a high pressure working medium leaking out of the high pressure working medium passages to the mating faces is caused to act on substantially the whole area of the mating faces, thereby preventing local deformation of the stationary valve plate and ensuring close contact between the sliding faces.

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, a moving valve plate provided on the rotor and a stationary valve plate provided on a valve body, and high pressure working medium passages and low pressure working medium passages penetrating mating faces of the valve body and the stationary valve plate,    wherein the outer circumference of the mating faces is sealed with an annular first sealing member and the circumference of the low pressure working medium passages is sealed with an annular second sealing member inside the first sealing member in the radial direction.    
   
   
       2 . The rotating fluid machine according to  claim 1 , wherein the first and second sealing members are C-shaped seals each having an opening in its section, the opening of the first sealing member is arranged inward in the radial direction, and the opening of the second sealing member is arranged outward in the radial direction.