Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1983-04-25
1984-01-10
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 27, F16J 1534
Patent
active
044249756
ABSTRACT:
The invention is a novel rotary shaft seal assembly which provides positive-contact sealing when the shaft is not rotated and which operates with its sealing surfaces separated by a film of compressed ambient gas whose width is independent of the speed of shaft rotation. In a preferred embodiment, the assembly includes a disc affixed to the shaft for rotation therewith. Axially movable, non-rotatable plates respectively supported by sealing bellows are positioned on either side of the disc to be in sealing engagement therewith. Each plate carries piezoelectric transducer elements which are electrically energized at startup to produce films of compressed ambient gas between the confronting surfaces of the plates and the disc. Following shutdown of the shaft, the transducer elements are de-energized. A control circuit responds to incipient rubbing between the plate and either disc by altering the electrical input to the transducer elements to eliminate rubbing.
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patent: 3359045 (1967-12-01), Hsu
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patent: 3471205 (1969-10-01), Farron et al.
patent: 3499653 (1968-06-01), Gardner
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patent: 3782737 (1974-01-01), Ludwig
patent: 3902084 (1975-08-01), May
patent: 3902085 (1975-08-01), Bizzigotti
patent: 4360207 (1982-11-01), Rappange et al.
Besha Richard G.
Hamel Stephen D.
Lewis Fred O.
Smith Robert I.
The United States of America as represented by the United States
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