US4365933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial vane ring consisting of ceramic materials for gas turbines
Assignee: Volkswagen AG
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Filing: 1979-11-13
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Granted: 1982-12-28
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Expires: 1999-11-13
Abstract
Abstract A ceramic vane ring for a turbine rotor is provided with slits on the inner and outer cylinderical ceramic cover ring holding the vanes. The slits provide radial stress relief and prevent fractures arising out of thermal stresses in the ceramic vane ring.
Inventors
- 👤 Manfred Langer
- 👤 Heinz Burfeindt
- 👤 Patrick Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:55
CPC Classifications
F; F01; F01D; F01D9/00; F01D9/02; F01D9/04; F01D9/041
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A ceramic vane ring for a turbine, comprising a plurality of ceramic turbine vanes radially extending between and joined with radially inner and outer ceramic cover rings, each of said cover rings having a radial stress relief slit arranged between each vane, said slits extending substantially in the axial direction of said ring and arranged at least in the same axial location as the trailing edge of said vanes, and wherein the radially outer surface of said outer cover ring is provided with stress relief grooves in the vicinity of the junction of said vanes and said outer ring.
Claim 2
Dependent Claim
99 words
A ceramic vane ring for a turbine, comprising a plurality of ceramic turbine vanes radially extending between and joined with radially inner and outer ceramic cover rings, each of said cover rings having a radial stress relief slit arranged between each vane, said slits extending substantially in the axial direction of said ring and arranged at least in the same axial location as the trailing edge of said vanes, and wherein the radially outer surface of said outer cover ring is provided with stress relief grooves in the vicinity of the junction of said vanes and said outer ring.
Claim 3
Dependent Claim
18 words
A vane ring as specified in claim 1, wherein said slits are arranged approximately midway between said vanes.
Claim 4
Dependent Claim
26 words
A vane ring as specified in claim 1, wherein said slits have an axial location on said rings corresponding to the trailing half of said vanes.
Claim 5
Dependent Claim
18 words
A vane ring as specified in claim 1 or claim 2, wherein said slits have rounded end zones.
Claim 6
Dependent Claim
24 words
A vane ring as specified in claim 1 or claim 2, wherein said slits include foils of heat-resistant material enclosed in said cover rings.
Claim 7
Dependent Claim
27 words
A vane ring as specified in claim 5, wherein said cover rings are provided with radially extending relief orifices at least at one end of said foils.
Claim 8
Dependent Claim
28 words
A vane ring as specified in claim 1, wherein said grooves extend essentially axially, and have a circumferential width approximately 40 to 60% of the circumferential vane spacing.
Claim 9
Dependent Claim
23 words
A vane ring as specified in claim 1, wherein the walls of said grooves extend essentially parallel to the contours of said vanes.
Claim 10
Dependent Claim
37 words
A vane ring as specified in claim 1, 7 or 8, wherein said outer cover ring, in the vicinity of said grooves has a radial thickness which corresponds approximately to the average profile thickness of said vanes.
Claim 11
Dependent Claim
39 words
A vane ring as specified in claim 1, 7 or 8, wherein said outer cover rings in regions other than said grooves has a radial thickness of approximately 3 to 10 times the average profile thickness of said vanes.
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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |