US3714784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply systems for jet aircraft engines
Assignee: HOBSON H Ltd GB
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Filing: 1971-02-18
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Granted: 1973-02-06
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Expires: 1991-02-18
Abstract
Abstract A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary,gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Inventors
- 👤 S Glaze
- 👤 D Craven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:14
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02K; F02K3/00; F02K3/08; F02K3/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, said primary flow control valve being operable to control flow in the primary manifold in response to axial movement only of said cam and said gutter and collander flow control valves being operable to control flow in the gutter and collander manifolds respectively in response both to axial movement and to rotation of said cam, means responsive to variations in delivery pressure Pt2 from the high pressure stage of the compressor of the engine for imparting axial movement to said cam, means operable in response to selection of reheat by the pilot for imparting rotational movement to said cam and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 2
Dependent Claim
182 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, said primary flow control valve being operable to control flow in the primary manifold in response to axial movement only of said cam and said gutter and collander flow control valves being operable to control flow in the gutter and collander manifolds respectively in response both to axial movement and to rotation of said cam, means responsive to variations in delivery pressure Pt2 from the high pressure stage of the compressor of the engine for imparting axial movement to said cam, means operable in response to selection of reheat by the pilot for imparting rotational movement to said cam and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 3
Dependent Claim
182 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, said primary flow control valve being operable to control flow in the primary manifold in response to axial movement only of said cam and said gutter and collander flow control valves being operable to control flow in the gutter and collander manifolds respectively in response both to axial movement and to rotation of said cam, means responsive to variations in delivery pressure Pt2 from the high pressure stage of the compressor of the engine for imparting axial movement to said cam, means operable in response to selection of reheat by the pilot for imparting rotational movement to said cam and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 4
Dependent Claim
182 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, said primary flow control valve being operable to control flow in the primary manifold in response to axial movement only of said cam and said gutter and collander flow control valves being operable to control flow in the gutter and collander manifolds respectively in response both to axial movement and to rotation of said cam, means responsive to variations in delivery pressure Pt2 from the high pressure stage of the compressor of the engine for imparting axial movement to said cam, means operable in response to selection of reheat by the pilot for imparting rotational movement to said cam and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 5
Dependent Claim
39 words
A fuel control system as claimed in claim 1, in which said means operable in response to selection of reheat includes an electrical turndown actuator operable under pilot''s control to provide a mechanical signal to the three dimensional cam.
Claim 6
Dependent Claim
54 words
A fuel control system as claimed in claim 1, which includes a repeater unit arranged to compare the fuel pressures downstream of the primary flow control valve and the gutter flow control valve and operative to throttle either the gutter or the primary flow to maintain equal pressures downstream of the flow control valves.
Claim 7
Dependent Claim
127 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, an inlet throttle valve controlling the flow of fuel to the pump, a mechanical governor driven by the pump, and a servo mechanism controlled jointly by the governor and by the pressure drop across the primary flow control valve and operative to adjust thE inlet throttle valve to vary the metering pressure across the primary metering valve as a function of engine speed.
Claim 8
Dependent Claim
127 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, an inlet throttle valve controlling the flow of fuel to the pump, a mechanical governor driven by the pump, and a servo mechanism controlled jointly by the governor and by the pressure drop across the primary flow control valve and operative to adjust thE inlet throttle valve to vary the metering pressure across the primary metering valve as a function of engine speed.
Claim 9
Dependent Claim
36 words
A fuel control system as claimed in claim 4, which includes means for controlling the inlet throttle valve to vary the metering pressure across the primary metering valve as a function of engine inlet total temperature.
Claim 10
Dependent Claim
166 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, and means for controlling the metering pressure across the primary flow control valve as a function of engine speed, said means including a first repeater unit arranged to compare the fuel pressures downstream of the primary flow control valve and the gutter flow control valve and operative to throttle one of the gutter and the primary flow to maintain equal pressures downstream of the flow control valves, and a second repeater unit which maintains the metering pressure across the collander flow control valve at a fraction of that across the other flow control valves, which fraction varies with engine inlet total temperature.
Claim 11
Dependent Claim
166 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, and means for controlling the metering pressure across the primary flow control valve as a function of engine speed, said means including a first repeater unit arranged to compare the fuel pressures downstream of the primary flow control valve and the gutter flow control valve and operative to throttle one of the gutter and the primary flow to maintain equal pressures downstream of the flow control valves, and a second repeater unit which maintains the metering pressure across the collander flow control valve at a fraction of that across the other flow control valves, which fraction varies with engine inlet total temperature.
Claim 12
Dependent Claim
120 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, a normally closed fuel inlet valve to the pump which is mechanically interlocked with fuel purge valves, means operative in response to switching on of reheat to open the fuel inlet valve and close the purge valves, and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 13
Dependent Claim
120 words
A reheat fuel control system for a jet aircraft engine, which comprises an engine-driven pump arranged to deliver fuel to primary, gutter and collander manifolds through individual primary, gutter and collander flow control valves, a three dimensional cam which is in joint control of the three control valves so as to maintain flows in the three manifolds which are desired functions of engine conditions, a normally closed fuel inlet valve to the pump which is mechanically interlocked with fuel purge valves, means operative in response to switching on of reheat to open the fuel inlet valve and close the purge valves, and means for controlling the metering pressure across the primary flow control valve as a function of engine speed.
Claim 14
Dependent Claim
39 words
A fuel control system as claimed in claim 7, which includes a priming line which by-passes the flow control valves, and a shut-off valve sensitive to manifold pressure and operative to close the priming line when priming is completed.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |