Mechanical face seals
AssigneeJohn Crane UK Limited
InventorsChristopher J. Fone, James Gilbert, Paul Martin
Life of this patent
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Abstract
A mechanical face seal has a first seal face member mounted in fixed rotational and axial relationship and sealed with respect to a housing, and a second seal face member mounted with respect to a shaft by means of an elastomeric bellows unit, the bellows unit being axially compressed so that it urges the second seal face member into sealing engagement with the first seal face member; the elastomeric bellows unit being formed from an elastomeric composition with reinforcing fibres embedded therein, the reinforcing fibres being orientated axially of the bellows unit.
Claims24
A mechanical face seal for providing a seal between a pair of relatively rotatable components comprising a first seal face member mounted in fixed rotational and axial relationship and sealed with respect to one component, a second seal face member mounted in fixed rotational relationship but movable axially of the other component, said second seal face member being sealed with respect to said other component and permanently urged axially into sealing engagement with the first seal face member solely by means of an elastomeric bellows unit, the elastomeric bellows unit defining an axially compressible convoluted section comprising a pair of axially extending portions, one axially extending portion being spaced radially of the other axially extending portion, the axially extending portions being interconnected by a radially extending portion, the radially extending portion being disposed at an acute angle to each axially extending portion, the bellows unit being formed from an elastomeric composition with reinforcing fibres embedded therein, the reinforcing fibres being orientated axially of the bellows unit, and the bellows unit being axially compressed when at its working length.
Dependencies are inferred from the claim text.