Two stage fuel metering system for gas turbine
First Claim
1. A fuel metering system for regulating the flow of fuel between a fuel supply and an engine, the fuel metering system comprising:
- a first flow path in fluid communication with the fuel supply and the engine;
a second flow path in fluid communication with the fuel supply and the engine, an electrically controlled servo valve regulating the fuel flow entering the first path; and
a metering valve regulating the fuel flow through the second path, the metering valve connected to be hydraulically controlled by the servo valve.
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Accused Products
Abstract
A novel two-stage fuel metering system is disclosed for metering the flown of fuel between a fuel supply and a combustion chamber of an engine the fuel in the supply being pressurized by a pump and delivered to the combustion chamber. The fuel metering system includes a first primary passageway for receiving fuel from a fuel supply and a second primary passageway fluidically connected to the first passageway for delivering fuel to a combustion chamber. A servo chamber is fluidically connected to both the first and second primary passageways and a servo valve is disposed between the first passageway and the servo chamber to selectively regulate the flow of fuel entering the chamber. A metering valve is disposed between the first and second passageways to regulate the flow of fuel from the first passageway to the second passageway the metering valve being biased to a closed position that obstructs the fuel flow. The metering valve further includes an actuating surface disposed in the chamber and responsive to the pressure in the chamber, wherein the metering valve is adapted to move from the closed position toward an open position in response to sufficient fuel pressure in the chamber. A conduit fluidically connects the chamber to the second passageway to restrict the flow of fuel therethrough to an upper limit.
40 Citations
22 Claims
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1. A fuel metering system for regulating the flow of fuel between a fuel supply and an engine, the fuel metering system comprising:
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a first flow path in fluid communication with the fuel supply and the engine;
a second flow path in fluid communication with the fuel supply and the engine, an electrically controlled servo valve regulating the fuel flow entering the first path; and
a metering valve regulating the fuel flow through the second path, the metering valve connected to be hydraulically controlled by the servo valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel metering system for regulating the flow of fuel between a pressurized fuel supply and an engine, the fuel metering system comprising in combination:
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an electrically controlled servo valve, a metering valve connected to be hydraulically controlled by the servo valve;
the servo valve being connected to operate in two modes including;
a) a first low flow mode in which the servo valve directly regulates the flow supplied to the engine, and b) a second higher flow mode in which the metering valve under the control of the servo valve regulates the flow supplied to the engine. - View Dependent Claims (11, 12, 13, 14)
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15. A fuel metering system for regulating the flow of pressurized fuel between a fuel supply and a combustion chamber of an engine, the fuel metering system comprising:
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a first passageway for receiving fuel from a fuel supply;
a second passageway for delivering fuel to a combustion chamber;
a chamber having an inlet in fluid communication with the first passageway and an outlet in fluid communication with the second passageway, the rate of fuel flow from the chamber to the second passageway restricted to an upper limit;
a servo valve disposed between the first passageway and chamber outlet to selectively regulate the flow of fuel from the first passageway into the chamber;
a metering valve disposed between the first passageway and the second passageway to regulate the flow of fuel from the first passageway to the second passageway, the metering valve biased to a closed position that obstructs the fuel flow the metering valve having an actuating surface disposed in the chamber and responsive to fuel pressure in the chamber, sufficient fuel pressure in the chamber moving the metering valve from the closed position toward an open position. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification