초록 ▼

A seal assembly has a pair of relatively rotatable sub-assemblies adapted to be attached and sealed respectively to relatively fixed and relatively rotatable members to confine the flow of fluid through the space between the members to a restricted passage. One of the sub-assemblies includes one of

A seal assembly has a pair of relatively rotatable sub-assemblies adapted to be attached and sealed respectively to relatively fixed and relatively rotatable members to confine the flow of fluid through the space between the members to a restricted passage. One of the sub-assemblies includes one of a pair of relatively rotatable seal rings. Coupling means are operable to selectively couple the other seal ring of the pair to a sub-assembly in a stand-by state in which the seal rings are not in relatively rotated engagement and, alternately, in a working state in which the seal rings are in relatively rotated engagement to seal the restricted passage. Preferably, the coupling means are operable while the sub-assemblies remain in respective installed positions; include means relatively movable to seal the opposed faces of the rings from the restricted passage in the stand-by state and to expose those faces to the passage in the working state, and are operable to couple the second seal ring alternatively to the respective sub-assemblies to provide the respective states of the seal rings. Preferably also, additional seal means are provided for sealing the restricted passage.

대표청구항 ▼

A seal assembly for sealing the space between relatively fixed and relatively rotated members one of which extends into the other, including: first and second relatively rotatable sub-assemblies adapted respectively to be attached and sealed to said respective members to confine the flow of fluid th

A seal assembly for sealing the space between relatively fixed and relatively rotated members one of which extends into the other, including: first and second relatively rotatable sub-assemblies adapted respectively to be attached and sealed to said respective members to confine the flow of fluid through said space to a restricted passage between them; first and second seal rings having opposed sealing faces engageable in relatively rotated relation to seal said passage, a first of said seal rings forming part of said first sub-assembly; and coupling means selectively operable to couple said second of said seal rings alternatively to said first sub-assembly in a seal-inoperative, stand-by state wherein said rings are not relatively rotated and to said second assembly in a seal operative, working state wherein said opposed faces of said seal rings are in relatively rotated engagement to seal said restricted passage.