Patent US3884041A successfully refreshed from Google Patents.
US3884041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine
Assignee: Sulzer AG
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Filing: 1973-11-06
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Granted: 1975-05-20
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Expires: 1993-11-06
Abstract
Abstract The bearing for the shaft between the compressor and turbine is housed within a casing which is sealed off from the surrounding environment by labyrinth seals. These seals are supplied with barrier air at a pressure p2 higher than that outside the casing. The barrier air is tapped from the flow path between the compressor and turbine on the exit side of the diffuser and is returned into the main gas flow between the compressor and turbine at a point where the pressure p1 is lower.
Inventors
- 👤 Ferdinand Zerlauth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:24
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/02; F01D11/04; F02; F02C; F02C7/00; F02C7/12; F02C7/14; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A gas turbine comprising a compressor having a flow duct for a gaseous working medium, a terminal rotor blading ring in said flow duct and an adjacent exit stator blading ring in said flow duct; a turbine downstream of said compressor; a diffuser between said compressor and said turbine for conducting the working medium and air between said compressor and said turbine; a rotor bearing for said compressor and said turbine mounted between said compressor and said turbine; a casing housing said rotor bearing; contactless seals in said casing sealing said bearing from the ambient zone outside said housing; a tapping duct connected between an exit end of said diffuser and said seals to deliver a flow of barrier medium to said seals at a first pressure higher than in said ambient zOne; and means defining a return flow path between said casing and said compressor flow duct to conduct the barrier medium from said seals into said flow duct at a pressure lower than said first pressure and at a point between said blading rings.
Claim 2
Dependent Claim
176 words
A gas turbine comprising a compressor having a flow duct for a gaseous working medium, a terminal rotor blading ring in said flow duct and an adjacent exit stator blading ring in said flow duct; a turbine downstream of said compressor; a diffuser between said compressor and said turbine for conducting the working medium and air between said compressor and said turbine; a rotor bearing for said compressor and said turbine mounted between said compressor and said turbine; a casing housing said rotor bearing; contactless seals in said casing sealing said bearing from the ambient zone outside said housing; a tapping duct connected between an exit end of said diffuser and said seals to deliver a flow of barrier medium to said seals at a first pressure higher than in said ambient zOne; and means defining a return flow path between said casing and said compressor flow duct to conduct the barrier medium from said seals into said flow duct at a pressure lower than said first pressure and at a point between said blading rings.
Claim 3
Dependent Claim
20 words
A gas turbine as set forth in claim 1 which further comprises a pressurized oil system for lubricating said bearing.
Claim 4
Dependent Claim
36 words
A gas turbine as set forth in claim 2 wherein said system includes an oil reservoir and which further includes a cooling coil in said oil reservoir for cooling the barrier medium in said tapping duct.
Claim 5
Dependent Claim
29 words
A gas turbine as set forth in claim 1 which further comprises a cooler in said tapping duct for cooling the barrier medium prior to entry into said seals.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |