Shaft seal

Details Shaft seal Shaft seal

1989-01-30

1990-08-14

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 53, 277133, 277134, F16J 1540

Patent

active

049481525

ABSTRACT:
A seal for the gap between two relatively rotatable machine parts, in which at least one of the two confronting surfaces is provided with at least one helical groove which has a pumping action toward the sealed space, and in which a preliminary seal is situated ahead of the helical groove on the side facing away from the sealed space. The preliminary seal includes a ring magnet which reaches close to the opposite surface except for a narrow gap. This gap is filled with a ferrofluid, and the radial width of the gap is substantially the same as the distance separating the helical ridges between the helical grooves from the surfaces opposite them.

REFERENCES:
patent: 3726574 (1973-04-01), Tuffias et al.
patent: 3746407 (1973-07-01), Stiles et al.
patent: 3788275 (1974-01-01), Hanson
patent: 3834775 (1074-09-01), Tuffias et al.
patent: 4486026 (1984-12-01), Furumura et al.
patent: 4598914 (1986-07-01), Furumura et al.
Article from Machine Design entitled "Magnetic-Fluid Seals", published 3/28/68, pp. 145-149.

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