US3811276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of combustion chamber walls
Assignee: Safran Aircraft Engines SAS
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Filing: 1972-10-06
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Granted: 1974-05-21
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Expires: 1992-10-06
Abstract
Abstract Means for providing a connection between an upstream element and a downstream element, offset towards the outside in relation to the latter, in a flame tube of a combustion chamber which is intended to function in an external flow of pressurized air. The connecting means comprise an annular solid body adapted to connect the said upstream element to the said downstream element and a thin tongue which is located in the extension of the upstream element and defines, with the downstream element, an annular duct into which there emerges a plurality of regularly spaced passages which pass through the said solid body in the general direction of the external flow in such a way as to take, from the latter, a current of air which is adapted to form, downstream of the annular duct, a film of cooling air on the inner surface of the downstream element. Each passage comprises an upstream bore which emerges coaxially, via an abrupt widened portion, into a downstream bore having a greater cross-section and an appreciable length which itself emerges into the annular duct.
Inventors
- 👤 J Castellant
- 👤 A Lacroix
- 👤 J Caruel
- 👤 H Quillevere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:34
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/06; F23R3/08; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A multi-ferrule flame tube having an upstream ferrule (10a), a downstream ferrule (10b) stepped outwardly with respect to said upstream ferrule, and an integral union member (13) interposed between said ferrules and comprising: an upstream cannular-like section (14) having an inner end flange (15) fast with said upstream ferrule (10a) and a plurality of stepped passages (21) formed by smaller-area upstream bores (22) and larger-area downstream bores (24) paired with each other in mutual register and interconnected through a first abrupt widening step (23), said upstream bores being separated by major solid radial parts and said downstream bores being separated by minor solid radial parts of smaller minimum width (e2) than that (e1) of said major radial parts, and a downstream annular section (20) having an outer end flange (16) fast with said downstream ferrule (10b) and an overhung tongue (19) defining therewith a circumferentially continuous duct (20) into which said downstream bores (24) open through a second abrupt widening step (30), whereby said integral union member (13) has a passage area which increases suddenly twice, once at said first abrupt widening step (23) at the junction of said upstream and downstream bores (22, 24), and again at said second abrupt widening step (30) at the junction of said downstream bores (24) and said circumferentially continuous duct (20).
Claim 2
Dependent Claim
218 words
A multi-ferrule flame tube having an upstream ferrule (10a), a downstream ferrule (10b) stepped outwardly with respect to said upstream ferrule, and an integral union member (13) interposed between said ferrules and comprising: an upstream cannular-like section (14) having an inner end flange (15) fast with said upstream ferrule (10a) and a plurality of stepped passages (21) formed by smaller-area upstream bores (22) and larger-area downstream bores (24) paired with each other in mutual register and interconnected through a first abrupt widening step (23), said upstream bores being separated by major solid radial parts and said downstream bores being separated by minor solid radial parts of smaller minimum width (e2) than that (e1) of said major radial parts, and a downstream annular section (20) having an outer end flange (16) fast with said downstream ferrule (10b) and an overhung tongue (19) defining therewith a circumferentially continuous duct (20) into which said downstream bores (24) open through a second abrupt widening step (30), whereby said integral union member (13) has a passage area which increases suddenly twice, once at said first abrupt widening step (23) at the junction of said upstream and downstream bores (22, 24), and again at said second abrupt widening step (30) at the junction of said downstream bores (24) and said circumferentially continuous duct (20).
Claim 3
Dependent Claim
57 words
A flame tube as claimed in claim 1, wherein said upstream bores (22), said downstream bores (24) and said circumferentially continuous duct (20) respectively have a first, a second and a third substantially uniform passage area, the second passage area being in excess of the first and the third passage area being in excess of the second.
Claim 4
Dependent Claim
47 words
A flame tube as claimed in claim 1, wherein said upstream bores (22) have a cylindrical inner surface and said downstream bores (24) have an at least part cylindrical inner surface of larger diameter (d2) than that (d1) of said upstream bores, said surfaces being substantially coaxial.
Claim 5
Dependent Claim
50 words
A flame tube as claimed in claim 3, wherein said downstream bores have a part cylindrical inner surface (24b) which is connected to the cylindrical inner surface (22b) of said upstream bores through a part circular abrupt widening step (23), whereby said downstream bores are partly trough-shaped and partly annular-shaped.
Claim 6
Dependent Claim
36 words
A flame tube as claimed in claim 4, wherein said trough-shaped part (28) and said annular-shaped part 29 of said downstream bores (24b) are respectively located toward the inside and the outside of the flame tube.
Claim 7
Dependent Claim
40 words
A flame tube as claimed in claim 3, wherein said downstream bores have a full cylindrical inner surface (24) which is connected to the cylindrical inner surface (22) of said upstream bores through a full circular abrupt widening step (23).
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |