US3937477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal system
Assignee: Borg Warner Corp
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Filing: 1973-12-26
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Granted: 1976-02-10
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Expires: 1993-12-26
Abstract
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.
Inventors
- 👤 Emeric J. Gyory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:04
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/002; F16J15/008; F16J15/16; F16J15/164; F16J15/40; F16J15/406
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
196 words
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.
Claim 2
Dependent Claim
196 words
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.
Claim 3
Dependent Claim
55 words
A sealing device as set forth in claim 1, in which said hydrodynamic seal comprises a helix formed on the surface of the other member and extending axially substantially between the ends of the sleeve, said sleeve having a cylindrical interior surface cooperating with but not contacting said helix to form the viscous shear pump.
Claim 4
Dependent Claim
179 words
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.
Claim 5
Dependent Claim
179 words
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.
Claim 6
Dependent Claim
107 words
A sealing device as set forth in claim 3, in which said seal ring body has a plurality of circumferentially spaced longitudinal grooves formed on the inner periphery thereof and communicating between said last-mentioned housing and said hydrodynamic seal, a contact face at the end of the ring facing the stationary face seal, and an opposite end surface within the last-mentioned housing of substantially equal area with the contact face, the fluid pressure in the hydrodynamic seal acting on the contact face and the opposite end of the seal body to provide a hydrostatic balance acting to urge the rotary seal body toward the stationary face seal.
Claim 7
Dependent Claim
51 words
A sealing device as set forth in claim 4, in which said seal ring body is in sliding contact with the annular walls of said last-mentioned housing, and an O-ring positioned in an annular groove in the outer periphery of the seal ring body in sealing contact with said last-mentioned housing.
Claim 8
Dependent Claim
71 words
A sealing device as set forth in claim 5, in which a circumferential flange is formed on the outer periphery of the seal ring body adjacent the open end of the last-mentioned housing, and said operative means includes one or more bell cranks pivotally mounted on the last-mentioned housing, each bell crank having one arm engaging the outer surface of the flange and the other arm terminating in an enlarged end.
Claim 9
Dependent Claim
80 words
A sealing device as set forth in claim 6, in which said last-mentioned housing has a circumferential outwardly extending recess at the open end receiving and providing limited movement of said flange, the enlarged ends of the bell cranks providing a substantial mass adapted to be acted upon by centrifugal force created by the rotation of said other member to rotate the bell cranks and urge said seal ring body to a noncontacting position relative to the stationary seal ring.
Claim 10
Dependent Claim
68 words
A sealing device as set forth in claim 5, in which said operative means includes one or more longitudinally extending passages formed in the shaft and extending between a first point in the hydrodynamic seal and a second point beyond the closed end of the housing, a shoulder formed on the other member and a cylindrical member slidably engaging the shoulder and receiving said rotary sealing ring therein.
Claim 11
Dependent Claim
52 words
A sealing device as set forth in claim 8, in which said last-mentioned housing is press-fitted on said other member, and said seal ring body has a circumferential flange press-fitted in said cylindrical member and cooperating with said last-mentioned housing to limit axial movement of the cylindrical member and seal ring body.
Claim 12
Dependent Claim
41 words
A sealing device as set forth in claim 9, in which said hydrodynamic seal comprises a helix formed on the surface of said other member and extending from adjacent said stationary face ring to a point spaced from said face ring.
Claim 13
Dependent Claim
66 words
A sealing device as set forth in claim 10, in which the forward outlet of each passage is on the forward wall of a turn of the helix, such that rotation of the other member pumps fluid along the helix away from said stationary face ring and increases the pressure in the passages, which in turn causes retraction of the cylindrical member and seal ring body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |