초록 ▼

A sealing device for a high pressure hydraulic piston mechanism in which the gap between the cylinder in which the piston is slideable to pressurize delivery fluid therein is sealed by sealing fluid drawn from a separate supply to that of the delivery fluid, delivery means being associated with the

A sealing device for a high pressure hydraulic piston mechanism in which the gap between the cylinder in which the piston is slideable to pressurize delivery fluid therein is sealed by sealing fluid drawn from a separate supply to that of the delivery fluid, delivery means being associated with the sealing fluid supply and being operable in response to pressurization of the delivery fluid to deliver sealing fluid to said gap at a pressure sufficient to form a seal therein, the sealing fluid of said seal being in direct contact with the pressurized delivery fluid and the piston being movable in at least one hydrostatic bearing supplied with sealing fluid in parallel to the supply thereof to said gap between the piston and the cylinder.

대표청구항 ▼

In hydraulic apparatus of the kind in which a reciprocating piston is slidably fitted with a close clearance gap between it and a cylinder wall designed for forming at an end thereof a high pressure hydraulic chamber located in a hydraulic flow channel for the processing of a first main fluid, the c

In hydraulic apparatus of the kind in which a reciprocating piston is slidably fitted with a close clearance gap between it and a cylinder wall designed for forming at an end thereof a high pressure hydraulic chamber located in a hydraulic flow channel for the processing of a first main fluid, the combination comprising, a further flow channel for the feeding of a second auxiliary viscous fluid distinct from said first main fluid though minglable therewith, a groove formed on said wall adjacent said high pressure hydraulic chamber and fed from said further flow channel with said second auxiliary viscous fluid to fill said close clearance gap thereby effectively sealing said high pressure hydraulic chamber around said piston, said close clearance gap allowing fluid leakage therethrough thereby permitting said first and second fluids directly to contact each other, and means in the wall providing a twin hydrostatic bearing system for said piston at a distance from said groove on the side thereof remote from said high pressure hydraulic chamber, said twin hydrostatic bearing system being fed with said second auxiliary viscous fluid in parallel with said groove and comprising two separate and distinct elemental fluid bearings formed by separate grooves in said cylinder wall spaced lengthwise along said piston.