Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1982-12-02
1983-11-15
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 65, 277 81R, F16J 1534, F16J 1540
Patent
active
044151659
ABSTRACT:
A shaft seal is presented which combines the attributes of the low pressure ealing of an O-ring and the high pressure sealing of a carbon face seal. This invention provides a dynamic shaft seal with the advantage of a very reliable, positive elastomeric O-ring seal for low pressure sealing and the advantage of a reliable graphite face seal for high pressure sealing incorporated into an integral configuration. This integral configuration allows a smooth transition between the low pressure O-ring seal and the high pressure carbon face seal without leakage. Springs are designed to provide the correct preload compression on the dynamic O-ring seal and the forces required such that the transition operation occurs at the proper differential pressure.
Mechanically, a rotating shaft within an aperture in a pressure housing wall is fitted with a sleeve containing a carbon face seal that mates against the face of an elastomeric/graphite-interface seal. The carbon face seal components are keyed to rotate with the shaft while the elastomeric/graphite-interface seal is keyed to the aperture and remains fixed in place during the shaft's rotation. The elastomeric/graphite-interface seal also houses an O-ring which provides a dynamic seal for the shaft at low pressure. Actuation of either the high pressure face type seal or the low pressure O-ring seal is adjustably controlled by compression springs in the mechanism.
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Beers Robert F.
Johnston Ervin F.
Rusche, Jr. Edmund W.
Smith Robert I.
The United States of America as represented by the Secretary of
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