US3738104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine fuel flow metering control system
Assignee: General Electric Co
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Filing: 1971-07-16
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Granted: 1973-06-12
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Expires: 1991-07-16
Abstract
Abstract A ''''free-wheeling'''' flow divider actuated by pressure of the liquid fuel meters fuel to the separate combustion chambers of a gas turbine. The actual fuel flow rate is sensed by measuring the speed of a shaft turning several positive-displacement flow dividing elements and is compared to a desired total fuel flow command signal. The difference or error signal operates a servo mechanism to adjust fuel flow rate to the ''''free-wheeling'''' flow divider.
Inventors
- 👤 H Rosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:06
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/228; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/263; Y10T137/8593; Y10T137/877
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
182 words
In a gas turbine fuel flow dividing control system of the type having a plurality of individual fuel lines to be furnished with equal metered flow rates of fuel for the combustion chambers of a gas turbine in response to a fuel flow command signal, the improvement comprising: a source of liquid fuel under pressure, a free-wheeling flow divider including a plurality of positive displacement metering elements supplied from an inlet and connected at a plurality of outlets to said individual fuel lines, said elements being constructed to rotate when subjected to a pressure difference, rotatable synchronizing means causing said elements to turn in unison, flow rate control means supplying an adjustable flow rate of liquid fuel from said source to said inlet of the flow divider at a pressure sufficient to actuate said metering elements, means responsive to the speed of said synchronizing means for producing a signal proportional to actual flow rate, and summing means arranged to compare said flow rate signal to said fuel flow command signal and having an output connected to actuate said flow rate control means.
Claim 2
Dependent Claim
182 words
In a gas turbine fuel flow dividing control system of the type having a plurality of individual fuel lines to be furnished with equal metered flow rates of fuel for the combustion chambers of a gas turbine in response to a fuel flow command signal, the improvement comprising: a source of liquid fuel under pressure, a free-wheeling flow divider including a plurality of positive displacement metering elements supplied from an inlet and connected at a plurality of outlets to said individual fuel lines, said elements being constructed to rotate when subjected to a pressure difference, rotatable synchronizing means causing said elements to turn in unison, flow rate control means supplying an adjustable flow rate of liquid fuel from said source to said inlet of the flow divider at a pressure sufficient to actuate said metering elements, means responsive to the speed of said synchronizing means for producing a signal proportional to actual flow rate, and summing means arranged to compare said flow rate signal to said fuel flow command signal and having an output connected to actuate said flow rate control means.
Claim 3
Dependent Claim
35 words
The combination according to claim 1, wherein said flow rate control means comprises a positive displacement pump with a bypass valve connected at the pump outlet and arranged to return flow to the pump inlet.
Claim 4
Dependent Claim
25 words
The combination according to claim 1, wherein said flow rate control means comprises a variable displacement pump with means to control the pump displacement stroke.
Claim 5
Dependent Claim
27 words
The combination according to claim 1, wherein said flow rate control means comprises a flow throttling valve connected between said pressurized fuel source and said flOw divider.
Claim 6
Dependent Claim
26 words
The combination according to claim 1, wherein said metering elements are gear pumps and wherein said synchronizing means is a common shaft carrying said gear pumps.
Claim 7
Dependent Claim
27 words
The combination according to claim 1, wherein said metering elements are gear pumps and wherein said synchronizing means is a common pinion geared to said gear pumps.
Claim 8
Dependent Claim
46 words
The combination according to claim 1, wherein said speed responsive means comprises a toothed wheel connected to be rotated by said synchronizing means, a variable magnetic reluctance sensor for providing pulses in response to rotation, and a converter for producing a voltage proportional to pulse frequency.
Claim 9
Dependent Claim
23 words
The combination according to claim 1, wherein said speed responsive means comprises a tachometer generator connected to be rotated by said synchronizing means.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |