Patent US4285634A successfully refreshed from Google Patents.
US4285634A
Expired / Lapsed
US
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Composite ceramic gas turbine blade
Assignee: MOTOREN-UND TURBINEN-UNION MUNCHEN A CORP OF W GERMANY GmbH
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Filing: 1979-08-09
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Granted: 1981-08-25
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Expires: 1999-08-09
Abstract
Abstract A gas turbine blade constituted of a supportive metallic blade core and a thin-walled ceramic blade airfoil, in which the airfoil is supported against a tip plate of the blade core. The blade core consists of rod or wire-shaped pins which have widened bases at their radially inner ends. Through these widened bases, the pins are retained in a metallic adapter slidable into a turbine disc.
Inventors
- 👤 Axel Rossman
- 👤 Wilhelm Hoffmuller
- 👤 Wolfgang Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:40
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/28; F01D5/284
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
In a gas turbine blade having a plurality of supporting metallic blade cores extending therethrough; a ceramic airfoil enveloping the cores at a spacing therefrom; a tip plate formed of ceramic material having a circumference in conformance with the airfoil, said airfoil engaging in a recess in said tip plate, each blade core having a widened head for restraining the tip plate, each core being a wire-shaped blade core including a root at the radially inward end thereof; and a generally cylindrical metallic adaptor adapted to be inserted and locked in a turbine disc for commonly supporting the blade by each core root.
Claim 2
Dependent Claim
103 words
In a gas turbine blade having a plurality of supporting metallic blade cores extending therethrough; a ceramic airfoil enveloping the cores at a spacing therefrom; a tip plate formed of ceramic material having a circumference in conformance with the airfoil, said airfoil engaging in a recess in said tip plate, each blade core having a widened head for restraining the tip plate, each core being a wire-shaped blade core including a root at the radially inward end thereof; and a generally cylindrical metallic adaptor adapted to be inserted and locked in a turbine disc for commonly supporting the blade by each core root.
Claim 3
Dependent Claim
21 words
Gas turbine blade as claimed in claim 1, the head and the root of said blade core including conical abutment surfaces.
Claim 4
Dependent Claim
50 words
Gas turbine blade as claimed in claim 1, said airfoil extending into a pedestal at the lower end thereof whereby in the assembled condition of a plurality of blades in the turbine disc the pedestals of all blades form a continuous closed ring while permitting narrow gaps to remain therebetween.
Claim 5
Dependent Claim
57 words
Gas turbine blade as claimed in claim 1, including a ceramic pedestal at the lower end of the airfoil, said pedestal having a recess for inserting the airfoil such that in the assembled condition in the turbine disc the pedestals of a plurality of blades form a continuous closed ring while permitting narrow gaps to remain therebetween.
Claim 6
Dependent Claim
19 words
Gas turbine blade as claimed in claim 1, wherein the airfoil consists spanwise of a plurality of mortised sections.
Claim 7
Dependent Claim
37 words
Gas turbine blade as claimed in claim 1, wherein in that the widened head of the blade core is formed by plastic deformation, diffusion welding or high-temperature brazing subsequent to the airfoil and tip plate being mounted.
Claim 8
Dependent Claim
47 words
Gas turbine blade as claimed in claim 1, comprising a layer of a yieldable material, such as ceramic foam or a felting of ceramic fibers, is arranged in the interior of the airfoil, and cooling air ducts in said blade airfoil extending in a generally spanwise direction.
Claim 9
Dependent Claim
34 words
Gas turbine blade as claimed in claim 7, wherein the cooling air ducts communicate with cooling air outlet ports arranged in the concave surface of the airfoil proximate the trailing edge of the blade.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |