US4212475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self aligning spiral groove face seal
Assignee: John Crane Inc
•
Filing: 1979-01-15
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Granted: 1980-07-15
•
Expires: 1999-01-15
Abstract
Abstract A self aligning, spiral groove, gas seal having a primary sealing ring and a mating sealing ring with opposed radially extending sealing faces, one of said rings having: (a) Spiral grooves extending inwardly from the outside diameter of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to the formula ##EQU1## where GD is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and (b) Said ring has a balance of between 0.8 and 0.9 according to the formula ##EQU2## where OD is the outside diameter of the sealing interface, ID is the internal diameter and BD is the balance diameter.
Inventors
- 👤 Josef Sedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:29
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F16J15/3408; F16J15/3412
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
In a self aligning spiral groove gas seal having a stationary sealing ring and a primary sealing ring with opposed radially extending faces, one of said rings being sealingly affixed to a housing and the other affixed to the shaft, the improvement comprising: spiral grooves extending inwardly from one circumference of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to one of the following formula ##EQU6## where groove diameter is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and said seal having a balance of between 0.8 and 0.9 according to the formula ##EQU7## where OD is the outside diameter of the sealing interface, ID is the inside diameter and BD is the balance diameter.
Claim 2
Dependent Claim
171 words
In a self aligning spiral groove gas seal having a stationary sealing ring and a primary sealing ring with opposed radially extending faces, one of said rings being sealingly affixed to a housing and the other affixed to the shaft, the improvement comprising: spiral grooves extending inwardly from one circumference of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to one of the following formula ##EQU6## where groove diameter is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and said seal having a balance of between 0.8 and 0.9 according to the formula ##EQU7## where OD is the outside diameter of the sealing interface, ID is the inside diameter and BD is the balance diameter.
Claim 3
Dependent Claim
26 words
A seal as recited in claim 1 in which the spiral grooves extend from the outside circumference of said face towards the center of said face.
Claim 4
Dependent Claim
26 words
A seal as recited in claim 1 in which the spiral grooves extend from the inside circumference of said face towards the center of said face.
Claim 5
Dependent Claim
171 words
In a self aligning spiral groove gas seal having a stationary sealing ring and a primary sealing ring with opposed radially extending faces, one of said rings being sealingly affixed to a housing and the other affixed to the shaft, the improvement comprising: spiral grooves extending inwardly from one circumference of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to one of the following formulas ##EQU8## where groove diameter is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and said ring has a balance of between 0.8 and 0.9 according to the formula ##EQU9## where OD is the outside diameter of the sealing interface, ID is the inside diameter and BD is the balance diameter.
Claim 6
Dependent Claim
171 words
In a self aligning spiral groove gas seal having a stationary sealing ring and a primary sealing ring with opposed radially extending faces, one of said rings being sealingly affixed to a housing and the other affixed to the shaft, the improvement comprising: spiral grooves extending inwardly from one circumference of the face of one of said rings, said grooves having a depth of between approximately 0.0001 and 0.0003 inches, said grooves extending across the face of said ring to provide a dam width ratio of between approximately 0.5 and 0.8 according to one of the following formulas ##EQU8## where groove diameter is the diameter of a circle defined by the boundary of the grooved area and the ungrooved area in said face, ID is the internal diameter and OD is the outside diameter; and said ring has a balance of between 0.8 and 0.9 according to the formula ##EQU9## where OD is the outside diameter of the sealing interface, ID is the inside diameter and BD is the balance diameter.
Claim 7
Dependent Claim
29 words
A seal as recited in claim 4 in which the spiral grooves extend from the inner circumference of the face of said ring toward the center of said face.
Claim 8
Dependent Claim
29 words
A seal as recited in claim 4 in which the spiral grooves extend from the outer circumference of the face of said ring toward the center of said face.
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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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |