Mechanical seal system
AssigneeBorg-Warner Corporation
InventorEmeric J. Gyory
Life of this patent
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Abstract
A sealing system for a rotatable shaft positioned in a passage extending through a housing where both static and dynamic sealing are achieved to prevent fluid leakage along the shaft from the liquid side to the air side of the seal. The system includes a helix formed either on the shaft or on the wall encompassing the shaft to provide a viscous shear pump forming a hydrodynamic seal, and a temporary face seal is provided at the air side end of the helix and adapted to effectuate sealing under static conditions and to diminish face seal contact upon rotation of the shaft.
Claims11
A sealing device for use between a pair of relatively rotating members, one of said members having an opening extending therethrough and receiving said other member therein, comprising a viscous shear pump defined between said members to provide a hydrodynamic seal therebetween, said hydrodynamic seal having dissimilar fluids on opposite sides thereof, an annular cylindrical sleeve positioned within said one member and encompassing said other member and having a radial flange sealingly engaging the interior wall of the one member and separating the dissimilar fluids, said hydrodynamic seal being formed between the other member and the sleeve, said sleeve having a plurality of radial openings therein communicating with the hydrodynamic seal and terminates in an annular rearward end, a stationary annular face ring supported by said rearward sleeve end to define a boundary between said dissimilar fluids, a rotary seal ring encompassing said other member to rotate therewith and reciprocable axially relative thereto toward and away from sealing contact with said face ring, resilient means yieldably urging said rotary seal ring against said face ring, and means operative upon relative rotation of said members to urge said rotary seal ring away from said stationary face ring.
A sealing device for use between a pair of relatively rotating members, one of said members having an opening extending therethrough and receiving said other member therein, comprising a viscous shear pump defined between said members to provide a hydrodynamic seal therebetween, said hydrodynamic seal having dissimilar fluids on opposite sides thereof, a stationary annular face ring mounted in said one member to define a boundary between said dissimilar fluids, a rotary seal ring encompassing said other member to rotate therewith and reciprocable axially relative thereto toward and away from sealing contact with said face ring, said rotary seal ring including an annular housing open at the end facing said stationary face ring and adapted to rotate with said other member and an annular seal ring body received within and axially reciprocable relative to said housing, resilient means acting between said housing and said seal ring body to yieldably urge said rotary seal ring against said face ring, and means operative upon relative rotation of said members to urge said rotary seal ring away from said stationary face ring.
Dependencies are inferred from the claim text.