US3797236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular combustion chamber with ceramic annular ring
Assignee: Rolls Royce PLC
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Filing: 1972-06-08
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Granted: 1974-03-19
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Expires: 1992-06-08
Abstract
Abstract An annular combustion chamber for a gas turbine engine in which an annular wall part is made of a ring of ceramic material which is located in the chamber by compression between a frusto-conical first face and a second face which is radial or frusto-conical.
Inventors
- 👤 N Hooke
- 👤 T Steel
- 👤 J Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:35
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/007; F01; F01D; F01D9/00; F01D9/02; F01D9/023; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
163 words
An annular combustion chamber for a gas turbine engine comprising at least one annular wall, an annular ring made of a ceramic material and forming at least a part of the axial length of said wall, support means for supporting said annular ceramic ring, said support means including a first annular frusto-conical face and an axially spaced second annular face opposing said first face and means to urge said first face and said second face towards one another, and said annular ceramic ring having a first frusto-conical face substantially complementary to and abutting said first face of said support means and a second face axially spaced from the first face of said ceramic ring and abutting and substantially complementary to said second face of said support means, said annular ceramic ring being supported under compression in a generally axial direction and being positioned both axially and radially by the urging together of said first face and said second face of said support means.
Claim 2
Dependent Claim
163 words
An annular combustion chamber for a gas turbine engine comprising at least one annular wall, an annular ring made of a ceramic material and forming at least a part of the axial length of said wall, support means for supporting said annular ceramic ring, said support means including a first annular frusto-conical face and an axially spaced second annular face opposing said first face and means to urge said first face and said second face towards one another, and said annular ceramic ring having a first frusto-conical face substantially complementary to and abutting said first face of said support means and a second face axially spaced from the first face of said ceramic ring and abutting and substantially complementary to said second face of said support means, said annular ceramic ring being supported under compression in a generally axial direction and being positioned both axially and radially by the urging together of said first face and said second face of said support means.
Claim 3
Dependent Claim
26 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which said second annular face of said ceramic ring is frusto-conical.
Claim 4
Dependent Claim
36 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which said second annular face of said annular ceramic ring lies substantially in a radial plane of said annular wall part.
Claim 5
Dependent Claim
58 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which at least one of the respective abutting faces of said annular ceramic ring and said support means is relieved to reduce contact area between said annular ceramic ring and said support means to thereby reduce heat conduction from the annular ceramic ring.
Claim 6
Dependent Claim
35 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which said means to urge said first and second second faces of said support means together is a spring means.
Claim 7
Dependent Claim
24 words
An annular combustion chamber for a gas turbine engine as claimed in claim 5 in which said spring means comprises a corrugated spring washer.
Claim 8
Dependent Claim
39 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which said combustion chamber has a discharge nozzle having inner and outer portions, said annular ceramic ring comprising the inner portion of the nozzle.
Claim 9
Dependent Claim
38 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 and in which there are a plurality of said ceramic rings which abut together to make up said annular wall of the combustion chamber.
Claim 10
Dependent Claim
42 words
An annular combustion chamber for a gas turbine engine as claimed in claim 8 and in which said faces are formed on the first and last members of said plurality of rings whereby said plurality of rings are held together in compression.
Claim 11
Dependent Claim
35 words
An annular combustion chamber as claimed in claim 8 and in which the intermediate members of the plurality are retained together by reduced diameter portions which engage with cut-away portions on the next adjacent rings.
Claim 12
Dependent Claim
24 words
An annular combustion chamber for a gas turbine engine as claimed in claim 1 in which said ceramic material comprises hot pressed silicon nitride.
Claim 13
Dependent Claim
42 words
An annular combustion chamber for a gas turbine engine as claimed in claim 7 in which said faces of said support means engage with the respective faces of said annular ceramic ring defining said nozzle inner portion at substantially the sAme radius.
Claim 14
Dependent Claim
46 words
An annular combustion chamber for a gas turbine engine as claimed in claim 7 in which said faces of said support means respectively engage the faces of said annular ceramic ring of said nozzle inner portion at said rings inner and outer peripheries at different radii.
Claim 15
Dependent Claim
33 words
An annular combustion chamber for a gas turbine engine as claimed in claim 8 in which the intermediate members of the plurality of rings are retained together by abutting substantially complementary frusto-conical faces.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |