Patent ID: 7367783
Filing Date: 2008-05-06
Classification: F01B,F04B

Abstract:
1. A rotating fluid machine comprising: a casing; a rotor rotatably supported at the casing; a working part provided at the rotor; and a rotary valve provided between the casing and the rotor and switching a supply passage and a discharge passage of a working medium for the working part, in which the rotary valve comprises a movable side valve plate provided at the rotor, a valve body portion fixed to the casing, and a fixed side valve plate supported at the valve body portion, said movable side valve plate and said fixed side valve plate abut to each other on a slide surface orthogonal to an axis, wherein said fixed side valve plate is floatingly supported on the valve body portion non-rotatably but relatively movably with respect to the valve body portion within an axial limited range, wherein a pressure chamber into which the working medium is introduced from a passage at a high pressure side out of the supply passage and the discharge passage of the working medium is opened to mating surfaces between the valve body portion and the fixed side valve plate, leakage of the working medium from the pressure chamber to the mating surfaces is sealed by a seal member housed in this pressure chamber, and the fixed side valve plate is pressed toward the slide surface with pressure of the working medium acting on the pressure chamber.