Patent US3754393A successfully refreshed from Google Patents.
US3754393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine combustor
Assignee: Nissan Motor Co Ltd
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Filing: 1971-10-01
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Granted: 1973-08-28
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Expires: 1991-10-01
Abstract
Abstract A gas turbine engine has a combustor having a combustion chamber and an air passage substantially surrounding the combustion chamber and leading from a compressor of the gas turbine engine. The air passage communicates with the combustion chamber through primary and secondary air inlets. A hot gas recirculating passage is formed between the combustion chamber and the air passage, providing communication between the combustion chamber and the primary air inlet. A limited portion of the hot gases produced in the combustion chamber is recirculated to the air inlet through the recirculating passage so as to be cooled by air circulated through the air passage, whereby the maximum temperature of the hot gases is reduced and the recirculated gases are re-burned to remove a combustible content remaining therein.
Inventors
- 👤 N Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:16
CPC Classifications
F; F23; F23C; F23C9/00; F02; F02C; F02C3/00; F02C3/34; F23R; F23R3/00; F23R3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A combustor for burning fuel and air mixture, comprising: A. an inner casing having a combustion chamber having an inlet port, said inner casing having formed therein a set of apertures opening to said combustion chamber; B. an intermediate casing partly enveloping said inner casing for defining between part of said inner casing and said intermediate casing an exhaust gas recirculating space which communicates with said combustion chamber through said apertures and converging to said inlet port; C. an outer casing enveloping said intermediate casing for defining between said intermediate casing and said outer casing a compressed air supplying space converging to said inlet port; D. a plurality of cooling fins mounted exterior of said intermediate caSing and exposed to said compressed air supplying space to conduct heat from said intermediate casing to the air travelling through said compressed air supplying space; and E. means for imparting a swirl to the air from said compressed air supplying space and the exhaust gas from said exhaust gas recirculation space.
Claim 2
Dependent Claim
168 words
A combustor for burning fuel and air mixture, comprising: A. an inner casing having a combustion chamber having an inlet port, said inner casing having formed therein a set of apertures opening to said combustion chamber; B. an intermediate casing partly enveloping said inner casing for defining between part of said inner casing and said intermediate casing an exhaust gas recirculating space which communicates with said combustion chamber through said apertures and converging to said inlet port; C. an outer casing enveloping said intermediate casing for defining between said intermediate casing and said outer casing a compressed air supplying space converging to said inlet port; D. a plurality of cooling fins mounted exterior of said intermediate caSing and exposed to said compressed air supplying space to conduct heat from said intermediate casing to the air travelling through said compressed air supplying space; and E. means for imparting a swirl to the air from said compressed air supplying space and the exhaust gas from said exhaust gas recirculation space.
Claim 3
Dependent Claim
19 words
A combustor as claimed in claim 1, wherein said means comprises a swirler located downstream of said inlet port.
Claim 4
Dependent Claim
44 words
A combustor as claimed in claim 1, wherein said inner casing further comprises means for supplying air from said compressed air supplying passage to the interior of said inner casing downstream of said combustion chamber to cool the exhaust gas from said combustion chamber.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |