Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1990-06-05
1991-10-01
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 15, 277 27, 277 72R, 277 74, 277 75, 277 961, F16J 1534
Patent
active
050526944
ABSTRACT:
A hydrostatic seal includes a high pressure cavity in one of two opposed sealing faces between a shaft and housing for supplying a pressurized barrier fluid between the opposed sealing faces, and an arrangement for preventing passage of the barrier fluid into the interior of the housing and for preventing the passage of machine fluid from the housing into the high pressure cavity. The arrangement includes a first circumferential dam for providing a narrow gap between the high pressure cavity and the interior of the housing and a system for maintaining the pressure of the barrier fluid in the high pressure cavity substantially equal to the pressure of the machine fluid in the housing. A discharge cavity is provided in one of the sealing faces for discharging barrier fluid from between the opposed barrier faces and preventing barrier fluid from leaking between the housing and the shaft to the ambient. A second circumferential dam is positioned between the high pressure cavity and the discharge cavity, and a third circumferential dam is positioned between the discharge cavity and the ambient.
REFERENCES:
patent: 3033577 (1962-05-01), Spiess
patent: 3499653 (1970-03-01), Gardner
patent: 3556538 (1971-01-01), Muller
patent: 3572727 (1971-03-01), Greiner
patent: 3926442 (1975-12-01), Muller
patent: 4523764 (1985-06-01), Albers et al.
Lindeboom, Hydrostatic Design Concept Applied to Dynamic Sealing Devices, presented at the Petroleum Mechanical Engineering Conference, Phila., Pa., Sep. 17-20, 1967.
EG&G Sealol Inc.
Shoap Allan N.
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