Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1979-11-07
1981-09-29
Ward, Jr., Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 40, 277 93R, F16J 1534, F16J 1540
Patent
active
042918871
ABSTRACT:
The object of the invention is to improve the film stiffness of a face seal without increasing the sealing and dam area.
The improved sealing apparatus (16) has a primary seal ring (20) in the form of a nose piece. A spring (24) forces a sealing surface (28) on the seal ring into sealing contact with a seat (18) to form a face seal. A circumferential clearance seal is formed in series with this face seal by a lip (34) on the nose piece. The width of the surface (36) of the lip is substantially the same as the width of the sealing surface (28) on the face seal. Also the clearance between the surface (36) on the lip and the shaft (10) is substantially the same as the spacing between the face sealing surfaces (28 and 30) on the face seal when the shaft is rotating.
The circumferential clearance seal restricts the flow of fluid from a main cavity (14) to an intermediate cavity (32) with a resulting pressure drop. The hydrostatic opening face is strongly dependent on the face seal clearance, and the desired axial stiffness is achieved.
REFERENCES:
patent: 2444714 (1948-07-01), Voytech
patent: 3462159 (1969-08-01), Baumann et al.
patent: 3536333 (1970-10-01), Gits et al.
patent: 3749412 (1973-07-01), Lingley
patent: 4026564 (1977-05-01), Metcalfe
Etsion Izhak
Frosch Robert A. Administrator of the National Aeronautics and Space
Lipshitz Abraham
Manning J. R.
Musial N. T.
Shook Gene E.
Ward, Jr. Robert S.
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