Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1993-07-19
1996-05-14
Cummings, Scott W.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 75, 277 961, F16J 1530
Patent
active
055161189
ABSTRACT:
A seal for sealing between a bidirectionally rotating shaft rotatable in the forward and reverse directions and having a sealing surface thereon located in a pressurized housing containing the shaft. A seal ring mounted in the housing for movement toward and away from the shaft sealing surface and having a high pressure side, a low pressure side, a seal face opposed to the shaft seal surface and an outer face remote from the seal face and exposed to the pressure in the housing. Resilient elements urge the seal ring toward the sealing surface of the shaft. Hydrodynamic elements in the form of a plurality of spaced recesses in the seal face of the seal ring and formed so as to produce negative hydrodynamic lift in the recess and urge the seal ring toward the sealing surface of the rotating shaft during forward rotation thereof. Openings extend through the seal ring from a predetermined section of the grooved seal surface thereof to the remote face of the seal ring to accommodate flow through such openings to reduce pressure build-up in the grooves of the sealing face to prevent seal leakage during reverse rotation of the shaft. A second seal is provided between the housing and the low pressure side of the seal ring.
REFERENCES:
patent: 2036308 (1936-04-01), Vroom
patent: 3759532 (1973-09-01), Lindeboom
patent: 3804424 (1974-04-01), Gardner
patent: 3894741 (1975-07-01), McHugh
patent: 4082296 (1978-04-01), Stein
patent: 4523764 (1985-06-01), Albens et al.
patent: 4916892 (1990-04-01), Pope
patent: 4943069 (1990-07-01), Jinnouchi
patent: 5145185 (1992-09-01), Pope
Cummings Scott W.
Dermer Zigmund L.
Stein Seal Company
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