Patent US3572728A successfully refreshed from Google Patents.
US3572728A
Expired / Lapsed
US
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Rotary seal
Assignee: General Electric Co
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Filing: 1968-06-17
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Granted: 1971-03-30
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Expires: 1988-06-17
Abstract
Abstract An improved rotary seal having at least one seal tooth carried by a rotating or stationary member and extending into close or rubbing contact with a sealing surface carried by the other member and means downstream of the seal tooth to receive and direct leakage fluid toward the leakage passage to thereby increase the apparent downstream pressure, decrease the apparent pressure drop across the seal tooth and, hence, decrease the amount of fluid leakage across the seal tooth.
Inventors
- 👤 Robert J Smuland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:52
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/02; F01D11/08; F16; F16J; F16J15/00; F16J15/44; F16J15/447; F16J15/4472
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
An improved rotary seal for use between an outer stationary member and an inner rotating member, said stationary member formed with a cylindrical sealing surface, at least one annular seal tooth projecting generally radially from said rotating member into close-spaced relationship with said cylindrical sealing surface and defining a small, generally cylindrical fluid leakage passage therebetween, a closure wall carried by said stationary member downstream of said seal tooth for receiving fluid effluxing from said leakage passage and redirecting said leakage fluid in an upstream direction, an annular wall member joining and extending upstream of said closure wall and defining, in cooperation with said cylindrical sealing surface and said closure wall, an annular chamber having an opening adjacent the downstream end of said leakage passage, said annular wall member a having an outer peripheral surface which is inclined toward said sealing surface from said closure wall to said opening so as to direct said redirected leakage fluid from said chamber opening to the downstream end of said leakage passage, whereby the apparent pressure at the downstream end of said leakage passage is increased and the seal effectiveness is enhanced.
Claim 2
Dependent Claim
189 words
An improved rotary seal for use between an outer stationary member and an inner rotating member, said stationary member formed with a cylindrical sealing surface, at least one annular seal tooth projecting generally radially from said rotating member into close-spaced relationship with said cylindrical sealing surface and defining a small, generally cylindrical fluid leakage passage therebetween, a closure wall carried by said stationary member downstream of said seal tooth for receiving fluid effluxing from said leakage passage and redirecting said leakage fluid in an upstream direction, an annular wall member joining and extending upstream of said closure wall and defining, in cooperation with said cylindrical sealing surface and said closure wall, an annular chamber having an opening adjacent the downstream end of said leakage passage, said annular wall member a having an outer peripheral surface which is inclined toward said sealing surface from said closure wall to said opening so as to direct said redirected leakage fluid from said chamber opening to the downstream end of said leakage passage, whereby the apparent pressure at the downstream end of said leakage passage is increased and the seal effectiveness is enhanced.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |