US3779007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel delivery and control system for a gas turbine engine
Assignee: General Electric Co
•
Filing: 1972-04-28
•
Granted: 1973-12-18
•
Expires: 1992-04-28
Abstract
Abstract A fuel delivery and control system is provided for use with a gas turbine engine and includes a fuel-oil heat exchanger for reducing engine oil temperature wherein a minimum rate of fuel flow is maintained through the heat exchanger and main fuel control by including a second recirculating valve in parallel flow connection to the fuel control metering valve. The recirculating valve is arranged to automatically open and close as a function of fuel temperature, metering valve position and in-flight engine fuel shutoff.
Inventors
- 👤 J Lavash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:30
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/12; F02C7/14; F02C7/22; F02C7/224; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A fuel delivery and control system for a gas turbine engine comprising: a fuel reservoir; a pump communicating with the fuel reservoir for drawing fuel therefrom; a heat exchanger communicating with the fuel pump for receipt of fuel therefrom, and further communicating with the gas turbine engine for receipt of hot engine oil therefrom wherein the hot engine oil is maintained in heat exchange relation with the fuel and then returned to the engine at a cooler temperature; a fuel control in downstream flow communication with the heat exchanger for receiving heated fuel therefrom and including a metering valve for scheduling the rate of fuel flow to the engine and a recirculating valve communicating with the metering valve inlet for scheduling an increasing rate of fuel flow therethrough as a function of increasing fuel temperature thereby maintaining a minimum rate of fuel flow to the fuel control; and means for directing the fuel discharged from the recirculating valve back to the fuel reservoir.
Claim 2
Dependent Claim
163 words
A fuel delivery and control system for a gas turbine engine comprising: a fuel reservoir; a pump communicating with the fuel reservoir for drawing fuel therefrom; a heat exchanger communicating with the fuel pump for receipt of fuel therefrom, and further communicating with the gas turbine engine for receipt of hot engine oil therefrom wherein the hot engine oil is maintained in heat exchange relation with the fuel and then returned to the engine at a cooler temperature; a fuel control in downstream flow communication with the heat exchanger for receiving heated fuel therefrom and including a metering valve for scheduling the rate of fuel flow to the engine and a recirculating valve communicating with the metering valve inlet for scheduling an increasing rate of fuel flow therethrough as a function of increasing fuel temperature thereby maintaining a minimum rate of fuel flow to the fuel control; and means for directing the fuel discharged from the recirculating valve back to the fuel reservoir.
Claim 3
Dependent Claim
69 words
The fuel delivery and control system of claim 1, wherein: the gas turbine engine is of the type having a supersonic capability and includes a thrust augmenting afterburner, and wherein the system further includes an augmentor fuel control in downstream flow communication with the heat exchanger for receiving a portion of the heated fuel therefrom and scheculing the flow of fuel to the afterburners according to engine mission requirements.
Claim 4
Dependent Claim
98 words
The fuel delivery and control system of claim 1 including: bypassing means adapted to bypass pressurized fuel from the pump outlet to the pump inlet whenever the pressure upstream of the metering valve is greater than a predetermined pressure level above the pressure downstream of the metering valve, and a cutoff and pressurizing valve in serial flow relation to the metered fuel flow for maintaining the fuel pressure above a minimum value and providing for positive fuel shutoff during engine shutdown and including means for increasing the rate of flow through the recirculating valve upon complete fuel shutoff.
Claim 5
Dependent Claim
52 words
The fuel delivery and control system of claim 1 wherein the metering valve is cooperatively coupled with the recirculating valve such that an opening of the metering valve will override opening of the recirculating valve, thereby insuring an accurate metered fuel flow rate regardless of the position demanded of the recirculating valve.
Claim 6
Dependent Claim
101 words
The fuel delivery and control system of claim 4 wherein: the metering valve includes a first piston displaceable in a first bore and cooperating with a first outlet port therethrough to form a first variable area orifice for the passage of fuel, wherein the piston is primarily controlled as a function of the position of a pilot control lever with additional control inputs reflecting selected engine operating parameters, and the recirculating valve includes a second piston displaceable in a second bore and cooperating with a second outlet port therethrough to form a second variable area orifice for the passage of Fuel.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |