Patent US3577877A successfully refreshed from Google Patents.
US3577877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel control systems for dual fuel gas turbine engines
Assignee: ZF International UK Ltd
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Filing: 1969-03-03
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Granted: 1971-05-11
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Expires: 1989-03-03
Abstract
Abstract The invention relates to a system for regulating the flow of two fuels to an engine adapted to run on either, regulation being achieved by two coupled valve members, each of which controls the flow of one fuel and which are moved axially by a servosystem powered by one of the fuels. The coupled valve members are rotatable about a common axis to vary the proportion of either fuel supplied to the engine. The configuration of the valve members is such that the total amount of fuel supplied to the engine remains substantially constant, in terms of the requirements of the engine. The servomechanism includes one or more control elements which are operated by signals obtained from the engine itself and/or from apparatus driven by the engine.
Inventors
- 👤 Eugene Harold Warne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:57
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/40; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87056; Y10T137/87088; Y10T137/87096; Y10T137/87121; Y10T137/87129; Y10T137/87137
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
163 words
A fuel control system for a dual fuel gas turbine engine comprising a servomechanism, a valve device incorporating a pair of valve pArts for controlling the flow of the two fuels respectively, the two valve parts being coupled together for movement both angularly about a common axis and axially by the servomechanism, the arrangement being such that at opposite limits of the angular movement of said valve parts the flow of the respective fuels is completely prevented, and for any given axial position in which the valve parts are located by the action of the associated servomechanism, the amount of one fuel which can flow to the associated engine under the control of one of said valve parts when in one limiting angular position is equivalent in terms of requirements of the said engine to the amount of the other fuel which can flow to the engine under the control of the other of the valve parts in the other limiting angular position.
Claim 2
Dependent Claim
163 words
A fuel control system for a dual fuel gas turbine engine comprising a servomechanism, a valve device incorporating a pair of valve pArts for controlling the flow of the two fuels respectively, the two valve parts being coupled together for movement both angularly about a common axis and axially by the servomechanism, the arrangement being such that at opposite limits of the angular movement of said valve parts the flow of the respective fuels is completely prevented, and for any given axial position in which the valve parts are located by the action of the associated servomechanism, the amount of one fuel which can flow to the associated engine under the control of one of said valve parts when in one limiting angular position is equivalent in terms of requirements of the said engine to the amount of the other fuel which can flow to the engine under the control of the other of the valve parts in the other limiting angular position.
Claim 3
Dependent Claim
18 words
A system as claimed in claim 1 in which the servomechanism is operated by one of the fuels.
Claim 4
Dependent Claim
35 words
A system as claimed in claim 1 in which the servomechanism positions the valve parts in accordance with signals obtained, in use, from the engine which the system controls and/or from other apparatus driven thereby.
Claim 5
Dependent Claim
68 words
A system as claimed in claim 2 in which the servomechanism includes a piston coupled to the said valve parts and urged by a pressure difference across the piston created by the passage of at least a part of the flow of one fuel through a restriction and one or more flow regulating means for varying the rate of flow of the said part of the one fuel.
Claim 6
Dependent Claim
42 words
A system as claimed in claim 4 which includes valve means tending to maintain the said passage of the said one fuel through the said restriction even when flow of the said one fuel through its associated valve part is completely prevented.
Claim 7
Dependent Claim
33 words
A system as claimed in claim 4 which includes pressure regulating means for the said one fuel whereby the total pressure drop through the restriction and said flow regulating means remains substantially constant.
Claim 8
Dependent Claim
31 words
A system as claimed in claim 1 in which the servomechanism includes a lever coacting both with the valve parts and with a pressure-sensitive element subjected to an air pressure signal.
Claim 9
Dependent Claim
30 words
A system as claimed in claim 7 which includes at least one pressure regulating means whereby a known proportion of the air pressure signal is supplied to the pressure-sensitive element.
Claim 10
Dependent Claim
56 words
A system as claimed in claim 8 in which the pressure regulating means includes a closure member positioned with respect to an orifice in accordance both with the magnitude of said air pressure signal and with a signal proportional to the power demand of the engine which the system controls or of other apparatus driven thereby.
Claim 11
Dependent Claim
33 words
A system as claimed in claim 7, in which the lever operates as one of the flow regulating means for varying the rate of flow of said one fuel through the said restriction.
Claim 12
Dependent Claim
34 words
A system as claimed in claim 4 in which one of the flow regulating means comprises a valve member responsive to the speed of the engine being controlled or of other apparatus driven thereby.
Claim 13
Dependent Claim
22 words
A system as claimed in claim 4 in which one of the flow regulating means comprises a valve member responsive to temperature.
Claim 14
Dependent Claim
34 words
A system as claimed in claim 6 in which one of the pressure regulating means comprises a valve member responsive to the speed of the engine being controlled or of other apparatus driven thereby.
Claim 15
Dependent Claim
22 words
A system as claimed in claim 6 in which one of the pressure regulating means comprises a valve member responsive to temperature.
Claim 16
Dependent Claim
32 words
A system as claimed in claim 7 which includes means for supplying gas at a constant pressure to the pressure-sensitive element, the said gas acting in opposition to the air pressure signal.
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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 |