Patent US4563125A successfully refreshed from Google Patents.
US4563125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic blades for turbomachines
Assignee: Office National d'Études et de Recherches Aérospatiales
•
Filing: 1983-12-14
•
Granted: 1986-01-07
•
Expires: 2003-12-14
Abstract
Abstract The blade comprises a metal web (1) surrounded by a refractory ceramic casing (2). The central web (1) is provided with at least one ventilation passage (4) in which flows a small amount of ventilation air. The zones where there is contact between the ceramic casing (2) and the central metal web (1) are provided with cooling cavities (5) in which cooling air flows at a high rate so as to establish a forced cooling condition.
Inventors
- 👤 Serge Boudigues
- 👤 Georges Frattacci
- 👤 Alain Ponthieux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:43
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; F01D5/14; F01D5/18; F01D5/30; F01D5/3084; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A turbine blade, suitable for use in a gas turbine, comprising: a metal core; a ceramic shell surrounding said metal core; at least one longitudinal cooling channel provided in said metal core; a space between the metal core and the ceramic shell in the middle part of the blade; two contact areas between the metal core and the ceramic shell respectively at the two end parts of the blade; means for cooling at least one of said two contact areas, said cooling means comprising a metallic annular cooling chamber outwardly surrounding the ceramic shell in front of said at least one contact area, said annular cooling chamber defining a circumferential cooling path which extends around said ceramic shell.
Claim 2
Dependent Claim
118 words
A turbine blade, suitable for use in a gas turbine, comprising: a metal core; a ceramic shell surrounding said metal core; at least one longitudinal cooling channel provided in said metal core; a space between the metal core and the ceramic shell in the middle part of the blade; two contact areas between the metal core and the ceramic shell respectively at the two end parts of the blade; means for cooling at least one of said two contact areas, said cooling means comprising a metallic annular cooling chamber outwardly surrounding the ceramic shell in front of said at least one contact area, said annular cooling chamber defining a circumferential cooling path which extends around said ceramic shell.
Claim 3
Dependent Claim
37 words
A turbine blade according to claim 1, in which the cooling chamber has a coolant outlet and a coolant inlet, said outlet and inlet being located at different points along the circumference of said annular cooling chamber.
Claim 4
Dependent Claim
28 words
A turbine blade according to claim 1 further comprising conduit means for conveying coolant fluid from a point upstream of said longitudinal cooling channel into said cooling chamber.
Claim 5
Dependent Claim
30 words
A turbine blade according to claim 2 further comprising conduit means for conveying coolant fluid from a point upstream of said longitudinal cooling channel to said cooling chamber coolant inlet.
Claim 6
Dependent Claim
28 words
A turbine blade according to claim 1 further comprising conduit means for conveying coolant fluid from a point downstream of said longitudinal cooling channel into said cooling chamber.
Claim 7
Dependent Claim
30 words
A turbine blade according to claim 2 further comprising conduit means for conveying coolant fluid from a point downstream of said longitudinal cooling channel to said cooling chamber coolant inlet.
References Cited (Backward Citations)
FR999820A
Cited
FR57426E
Cited
US3433015A
Cited
US4017209A
Cited
US4285634A
Cited
US4293275A
Cited
US4247259A
Cited
FR2463849A1
Cited
US4288201A
Cited
US4396349A
Cited
US4480956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |