Integral Elastomeric/Graphite Dynamic Face Seal.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A shaft seal is presented which combines the attributes of the low pressure sealing 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 0-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 elastomericgraphite-interface seal. The carbon face seal components are keyed to rotate with the shaft while the elstomericgraphite-interface seal is keyed to the aperture and remains fixed in place during the shafts rotation. The elastomericgraphiteinterface 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 adjustable controlled by compression springs in the mechanism. Author
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