US3577878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame tubes for gas turbine engines
Assignee: ZF International UK Ltd
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Filing: 1968-12-11
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Granted: 1971-05-11
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Expires: 1988-12-11
Abstract
Abstract A flame tube for a gas turbine engine includes a plurality of primary combustion air inlets, a plurality of secondary combustion air inlets and a plurality of dilution air inlets and variable flow restricting means associated with at least some of the inlets for varying the ratio of primary combustion air to secondary combustion air to dilution air.
Inventors
- 👤 Kenneth Greenwood
- 👤 Alban Heaton
- 👤 Alwin Harrison
- 👤 Squire Ronald Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:30
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/26; F05; F05B; F05B2250/00; F05B2250/40; F05B2250/41; F05B2250/411; F05B2260/00; F05B2260/70; F23R2900/00; F23R2900/00001
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
An annular section flame tube for a gas turbine engine comprising an annular chamber having an annular primary combustion air inlet passage and at least one coaxial annular secondary combustion air inlet passage opening into said chamber downstream of said primary combustion air inlet passage, and airflow restricting means at the upstream ends of said passages displaceable in one direction to increase the intake area of the primary combustion air inlet passage and simultaneously to decrease the intake area of the secondary combustion air inlet passage and movable in the opposite direction to decrease the intake area of the primary combustion air inlet passage and simultaneously to increase the intake area of the secondary combustion air inlet passage.
Claim 2
Dependent Claim
118 words
An annular section flame tube for a gas turbine engine comprising an annular chamber having an annular primary combustion air inlet passage and at least one coaxial annular secondary combustion air inlet passage opening into said chamber downstream of said primary combustion air inlet passage, and airflow restricting means at the upstream ends of said passages displaceable in one direction to increase the intake area of the primary combustion air inlet passage and simultaneously to decrease the intake area of the secondary combustion air inlet passage and movable in the opposite direction to decrease the intake area of the primary combustion air inlet passage and simultaneously to increase the intake area of the secondary combustion air inlet passage.
Claim 3
Dependent Claim
189 words
An annular section flame tube for a gas turbine engine comprising an annular chamber having an annular primary combustion air inlet passage and at least one coaxial annular secondary combustion air inlet passage opening into said chamber downstream of said primary combustion air inlet passage, and airflow restricting means at the upstream ends of said passages displaceable in one direction to increase the intake area of the primary combustion air inlet passage and decrease the intake area of the secondary combustion air inlet passage and movable in the opposite direction to decrease the intake area of the primary combustion air inlet passage and increase the intake area of the secondary combustion air inlet passage, a tubular wall separating said primary combustion air inlet passage from said secondary combustion air inlet passage, said airflow restricting means comprising a plurality of flaps arranged in an annular row at the upstream end of said tubular wall and pivoted on axes tangential to said wall and means for displacing said flaps in one direction across the secondary combustion air inlet passage and in the opposite direction across the primary combustion air inlet passage.
Claim 4
Dependent Claim
189 words
An annular section flame tube for a gas turbine engine comprising an annular chamber having an annular primary combustion air inlet passage and at least one coaxial annular secondary combustion air inlet passage opening into said chamber downstream of said primary combustion air inlet passage, and airflow restricting means at the upstream ends of said passages displaceable in one direction to increase the intake area of the primary combustion air inlet passage and decrease the intake area of the secondary combustion air inlet passage and movable in the opposite direction to decrease the intake area of the primary combustion air inlet passage and increase the intake area of the secondary combustion air inlet passage, a tubular wall separating said primary combustion air inlet passage from said secondary combustion air inlet passage, said airflow restricting means comprising a plurality of flaps arranged in an annular row at the upstream end of said tubular wall and pivoted on axes tangential to said wall and means for displacing said flaps in one direction across the secondary combustion air inlet passage and in the opposite direction across the primary combustion air inlet passage.
Claim 5
Dependent Claim
25 words
An annular section flame tube as claimed in claim 2 in which the secondary combustion air inlet passage surrounds the primary combustion air inlet passage.
Claim 6
Dependent Claim
89 words
An annular section flame tube as claimed in claim 3 further comprising an additional annular secondary combustion air inlet passage arranged coaxially within the primary combustion air inlet passage and divided therefrom by a further tubular wall, further flaps arranged in an annular row at the upstream end of said further tubular wall and pivotable on axes tangential to said further tubular wall, and further means for displacing said further flaps outwardly across the primary combustion air inlet passage and inwardly across the additional secondary combustion air inlet passage.
Claim 7
Dependent Claim
115 words
An annular section flame tube as claimed in claim 4 in which said means for displacing said flaps and said further means for displacing said further flaps comprise the combination of a common axially movable structure, means connecting said structure to said flaps for inward displacement thereof by axial movement of said structure in one direction and outward displacement of the flaps by axial movement of the structure in the opposite direction and means connecting said further flaps to the structure for outward displacement of said further flaps by axial movement of said structure in said one direction and inward displacement of said further flaps by axial movement of said structure in the opposite direction.
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |