US3964753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled aperture seal
Assignee: Avco Corp
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Filing: 1975-01-09
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Granted: 1976-06-22
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Expires: 1995-01-09
Abstract
Abstract A carbon ring seal for a shaft rotating at high speed is capable of preventing high temperature, high pressure gas from entering the oil system. The carbon seal is constructed so that at ambient temperature it works as a controlled gap seal, but when the seal runner reaches its full thermal growth the seal then functions as a positive contact seal. The carbon seal ring is retained by an anti-rotation pin extending through a slot in the ring. The carbon ring has a single fracture at the slot. The seal housing is provided with a plurality of calibrated holes for predetermined internal pressurization and cooling.
Inventors
- 👤 Arnold E. Junker
- 👤 Anthony J. Massaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:32
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/26; F16J15/30; Y; Y10; Y10S; Y10S277/00; Y10S277/93; Y10S277/931
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
101 words
A seal for use on a high-speed rotating shaft, the combination comprising: a seal runner on said shaft; a seal housing; a seal ring within said housing, said seal ring having an inner diameter greater than the outer diameter of said runner when said shaft is cold and essentially equal to the diameter of said runner during normal operating conditions; a radial slot in said ring; means pivoting said seal ring to said housing through said slot for permitting radial and pivotal movement of said ring; a radial fracture in said ring; and means retaining said seal ring within said housing.
Claim 2
Dependent Claim
101 words
A seal for use on a high-speed rotating shaft, the combination comprising: a seal runner on said shaft; a seal housing; a seal ring within said housing, said seal ring having an inner diameter greater than the outer diameter of said runner when said shaft is cold and essentially equal to the diameter of said runner during normal operating conditions; a radial slot in said ring; means pivoting said seal ring to said housing through said slot for permitting radial and pivotal movement of said ring; a radial fracture in said ring; and means retaining said seal ring within said housing.
Claim 3
Dependent Claim
18 words
The invention as defined in claim 1 wherein said seal ring is carbon and is inherently circumferentially resilient.
Claim 4
Dependent Claim
16 words
The invention as defined in claim 1, and a circumferential garter spring on said seal ring.
Claim 5
Dependent Claim
60 words
The invention as defined in claim 1 wherein said housing is provided with a plurality of circumferentially spaced ports for admitting gas under pressure to said housing, said ports being sized for providing predetermined internal pressurization for optimum seal performance, cooling and to provide an axial, aerodynamic pressure load on said seal ring against the housing to avoid radial leakage.
Claim 6
Dependent Claim
21 words
The invention as defined in claim 4 and means for supplying a film of oil between said ring and said runner.
Claim 7
Dependent Claim
18 words
The invention as defined in claim 5 wherein said retaining means and said runner form a labyrinth seal.
Claim 8
Dependent Claim
14 words
The invention as defined in claim 1 wherein said fracture is at said slot.
Claim 9
Dependent Claim
81 words
A seal for use on a high-speed rotating shaft, the combination comprising: a seal runner on said shaft; a stationary seal housing; a ring mounted about said runner and pivoted to said housing, said ring having a single radial fracture therethrough, the inner diameter of said ring prior to initial use being smaller than the diameter of said runner under normally hot operating conditions, whereby said ring expands at said fracture until worn by friction to the size of said runner.
Claim 10
Dependent Claim
81 words
A seal for use on a high-speed rotating shaft, the combination comprising: a seal runner on said shaft; a stationary seal housing; a ring mounted about said runner and pivoted to said housing, said ring having a single radial fracture therethrough, the inner diameter of said ring prior to initial use being smaller than the diameter of said runner under normally hot operating conditions, whereby said ring expands at said fracture until worn by friction to the size of said runner.
Claim 11
Dependent Claim
21 words
The invention as defined in claim 8 and means for internally pressurizing said ring against said housing for optimum seal performance.
Claim 12
Dependent Claim
34 words
The invention as defined in claim 9 wherein said pressurizing means comprises a plurality of ports in said housing for admitting pressurized gas to said housing, said gas providing a coolant for said seal.
Claim 13
Dependent Claim
16 words
The invention as defined in claim 8 and means for retaining said ring within said housing.
Claim 14
Dependent Claim
18 words
The invention as defined in claim 11 wherein said retaining means and said runner comprise a labyrinth seal.
Claim 15
Dependent Claim
31 words
The invention as defined in claim 8 wherein said ring has a radial slot and is pivoted to said housing through said slot and wherein said fracture is at said slot.
Claim 16
Dependent Claim
17 words
The invention as defined in claim 8 wherein said ring is carbon and is inherently circumferentially resilient.
Claim 17
Dependent Claim
14 words
The invention as defined in claim 8 and a garter spring surrounding said ring.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |