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.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a rotating fluid machine provided with a casing, a rotor rotatably supported by the casing, a working section provided on the rotor, and a rotary valve, provided between the casing and the rotor, for controlling the supply and discharge of the working medium to and from the working section. [0003] 2. Description of the Related Art [0004] In a rotary valve for rotating fluid machines of this kind, 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 of the rotor are brought into contact with each other on sliding faces orthogonal to the axis, and the rotation of the moving valve plate relative to the stationary valve plate causes steam of high temperature and high pressure to be successively supplied to or discharged from a group of axial piston cylinders...

AI Technical Summary

Benefits of technology

[0009] With the configuration described above, as the arrangement of the annular first sealing member on the outer circumference of the mating faces of the valve body and the stationary valve plate of the rotary valve of the rotating fluid machine encloses both the high pressure working medium passages and the low pressure working medium passages penetrating the mating faces inside in their 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. Also, since the annular second sealing member is arranged around the low pressure working medium passages inside the first sealing member in the radial direction, the second sealing member prevents the high pressure working medium on the mating faces from being discharged to the low pressure working medium passages. As the second sealing member encloses only a narrow area around the low pressure working medium passages, there is no fear that low pressure locally deforms the stationary valve plate.

[0011] With the configuration described above, as the opening of the first sealing member comprising a C-shaped seal is arranged inward in the radial direction, the sealing performance of the first sealing member can be increased by the pressure of a high pressure working medium leaking from the high pressure working medium passages to the mating faces, thereby preventing the high pressure working medium from being discharged outside from the mating faces. Further, as the opening of the second sealing member comprising a C-shaped seal is arranged outward in the radial direction, the sealing performance of the second sealing member can be increased by the pressure of a high pressure working medium leaking to the mating faces, thereby preventing the high pressure working medium from being discharged out of the mating faces to the low pressure working medium passages.

Problems solved by technology

Therefore, there is a possibility that the high pressure and the low pressure act locally on the stationary valve plate to invite flexural deformation, whereby the close contact between its sliding face and that of the moving valve plate is lost, so that high temperature high pressure steam leaks.

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