Segmented hydrodynamic seals for sealing a rotatable shaft

Details Segmented hydrodynamic seals for sealing a rotatable shaft Segmented hydrodynamic seals for sealing a rotatable shaft

1993-07-19

1996-04-23

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277142, 277175, 277199, F16J 1544

Patent

active

055096646

ABSTRACT:
A seal for sealing between a rotating shaft and a housing comprising a seal ring formed by a plurality of circumferentially spaced segments mounted for movement toward and away from the shaft and having a high pressure side, a low pressure side, an inner circumferential face opposed to the shaft and an outer circumferential face. Resilient means urge the seal ring toward the shaft. Hydrodynamic means in the form of one or more plurality of spaced recesses in the inner circumferential face of each segment are formed so as to produce negative hydrodynamic lift in the recess and urge the seal ring segments toward the rotating shaft during normal rotation thereof. The seal segments are circumferentially spaced with the radial space between adjacent segments mated by complementary tongues and grooves formed in adjacent seal segments. The segments are in contact to form a continuous seal. The tongue and groove at each radial space between adjacent seal segments form a seal therebetween, however, under certain circumstances, pressure may build up in the radial space causing leakage of fluid along the radial space. In order to relieve this build-up, a pressure reducing passageway is formed in each tongue portion extending from the radial space to the adjacent end of the adjacent recess in the seal segment to cause fluid flow from the radial space into the recess to prevent seal leakage. A second seal is provided between the housing and the low pressure side of the seal ring.

REFERENCES:
patent: 1860267 (1931-02-01), Smittle
patent: 2908516 (1959-10-01), Stein
patent: 3575424 (1971-04-01), Taschenberg
patent: 4082296 (1978-04-01), Stein
patent: 4406466 (1983-09-01), Geary
patent: 4426087 (1984-01-01), Sargent et al.
patent: 4943069 (1990-07-01), Jinnouchi
patent: 5039115 (1991-08-01), Herbert et al.
patent: 5058904 (1991-10-01), Nevola

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