Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1982-03-25
1984-04-03
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 55, 277135, F16J 1516, F16J 1544, F16J 1540
Patent
active
044404026
ABSTRACT:
A ferrofin magnetic-fluid seal for hermetically sealing the space between a portion of a rotating member of magnetically permeable material and a portion of a close-fitting, spaced-apart stationary member also fabricated from magnetically permeable material and comprising a part of a housing for journalling the rotating member. The ferrofin magnetic-fluid seal is comprised of a plurality of concentric, fin-like projections of magnetically permeable material formed on each of the rotating member and the stationary member in spaced-apart opposing relation to define a plurality of magnetic gap regions. The magnetic ferrofluid is disposed within the magnetic gap regions. A magnetic field producing means is magnetically coupled in closed magnetic circuit relationship with at least the portions of the rotating and stationary members, the opposed fin-like projections and the magnetic ferrofluid trapped in the magnetic gaps defined between the opposing ends of the fin-like projections. The new and improved ferrofin magnetic-fluid seal can be used either alone or in conjunction with a centrifugal seal to form a combination magnetic/centrifugal fluid-seal.
REFERENCES:
patent: 1642085 (1927-09-01), Pochobradsky
patent: 2557140 (1951-06-01), Razdowitz
patent: 3097853 (1963-07-01), McHugh
patent: 3940150 (1976-02-01), Martin et al.
patent: 4304411 (1981-12-01), Wilcock et al.
patent: 4335885 (1982-06-01), Heshmat
Pinkus Oscar
Walowit Jed A.
Claeys Joseph V.
Mechanical Technology Incorporated
Trausch III Arthur N.
Ward Robert S.
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