Patent US3967919A successfully refreshed from Google Patents.
US3967919A
Expired / Lapsed
US
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Compound turbine rotor
Assignee: Cegelec SA
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Filing: 1975-04-18
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Granted: 1976-07-06
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Expires: 1995-04-18
Abstract
Abstract The invention concerns welded turbine rotors. It is characterized in that,n the elements constituting a welded rotor which consist of a blade bearing block having at least one axial protuberance, that axial protuberance is made of steel having a lower carbon and nickel content than the remainder of the element and is joined thereto by a transition zone also made of steel. The invention applies more particularly to high-power steam turbines.
Inventors
- 👤 Andre Coulon
- 👤 Rene Perrin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:43
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/23; B23K9/232; F; F01; F01D; F01D5/00; F01D5/02; F01D5/06; F01D5/063
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
In a turbine rotor constituted by an axial succession of elements welded to one another and each comprising a blade bearing block, provided with at least one axial protuberance, in the form of a body having a substantially circular cross-section, to which is welded a similar axial protuberance of an adjacent element, the improvement wherein: said axial protuberance is made of a steel different from that constituting said block and is joined to that block by a transition zone also made of steel.
Claim 2
Dependent Claim
83 words
In a turbine rotor constituted by an axial succession of elements welded to one another and each comprising a blade bearing block, provided with at least one axial protuberance, in the form of a body having a substantially circular cross-section, to which is welded a similar axial protuberance of an adjacent element, the improvement wherein: said axial protuberance is made of a steel different from that constituting said block and is joined to that block by a transition zone also made of steel.
Claim 3
Dependent Claim
30 words
The turbine rotor according to claim 1, wherein: the steel constituting said protuberance has a carbon content and, a nickel content, lower than those of the steel constituting said block.
Claim 4
Dependent Claim
40 words
The turbine rotor according to claim 2, wherein: the steel constituting said transition zone is preferably a steel having a nickel content comprised between that of the steel constituting said axial protuberance and that of the steel constituting said block.
Claim 5
Dependent Claim
50 words
The turbine rotor according to claim 2, wherein: the steel constituting said axial protuberance has a carbon content no greater than 0.25% and, a nickel content no greater than 1.5%, whereas the steel constituting said block has a carbon content higher than 0.26% and a nickel content lower than 3.5%.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |