Self-hydraulic pressure generating and maintaining device for sh

Details Self-hydraulic pressure generating and maintaining device for sh Self-hydraulic pressure generating and maintaining device for sh

1982-12-02

1984-02-14

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 15, 277 29, 277 75, F16J 1540, F16J 1554

Patent

active

044311990

ABSTRACT:
A pressurizing device for a pump seal includes a cylindrical chamber fitted over an extension of a pump shaft external of the seal with a sliding piston inside the chamber being mounted for reciprocation relative to the external shaft portion in dividing the space in the cylinder into high pressure and low pressure chambers with the high pressure chamber communicating with the seal. A screw pump consisting of a pumping thread on the shaft is positioned in a bore axially extending through the piston with rotation of the shaft effecting pumping through a check valve to the high pressure chamber from the low pressure chamber so as to cause the piston to move toward the low pressure chamber and compress a compression spring mounted in the low pressure chamber. The compression spring urges the piston toward the high pressure chamber so as to always maintain high pressure in the high pressure chamber after the pump operation and consequent rotation of the shaft is terminated. Pressure relief valve means vents the high pressure chamber to the low pressure chamber when pressures reach a predetermined value in the high pressure chamber.

REFERENCES:
patent: 1130615 (1915-03-01), Lawsen
patent: 2774619 (1956-12-01), Mercier
patent: 3161413 (1964-12-01), Audemar
patent: 3937022 (1976-02-01), Swearingen
patent: 3972396 (1976-08-01), Bochnak

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