Aeroengine oil tank fire protection system
AssigneeROLLS-ROYCE plc
InventorsClare D Champion, Philippe Christol
Life of this patent
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Abstract
A gas turbine engine comprising an oil system and a gearbox, the gearbox is driven by at least one engine shaft, the oil system comprises a pump drivingly connected to the gearbox, an oil tank connected to the pump via a supply pipe and a delivery pipe connecting the pump to the engine for delivery of oil thereto, an anti-siphon pipe is connected between the tank and the delivery pipe to provide an excess oil flow to the engine characterized in that the anti-siphon pipe includes a variable flow valve for regulating the flow of oil passing therethrough such that at low engine speeds an adequate supply of oil is provided to a sight glass in the tank.
Claims13
A method of adjusting oil flow to a gas turbine engine comprising providing a gearbox driven by at least one engine shaft, an oil system comprising a pump drivingly connected to the gearbox, an oil tank connected to the pump via a supply pipe, a delivery pipe connecting the pump to the engine for delivery of oil thereto, and an anti-siphon pipe connected between the tank and the delivery pipe to provide an excess oil flow to the engine and an oil flow over a sight glass in the tank, the anti-siphon pipe including a variable flow valve for regulating the flow of oil passing therethrough, wherein the variable flow valve is operable via a drive means and the drive means is operated via an engine control system, the method further comprising the steps of:
- operating the gas turbine engine to drive the gear box and oil system, thereby supplying oil to the engine;
- and
- opening the valve to increase oil flow at low engine speeds to provide adequate oil flow over the sight glass to provide fire protection.
A method of adjusting oil flow to a gas turbine engine comprising providing a gearbox driven by at least one engine shaft, an oil system comprising a pump drivingly connected to the gearbox, an oil tank connected to the pump via a supply pipe, a delivery pipe connecting the pump to the engine for delivery of oil thereto, and an anti-siphon pipe connected between the tank and the delivery pipe to provide an excess oil flow to the engine and an oil flow over a sight glass in the tank, the anti-siphon pipe including a variable flow valve for regulating the flow of oil passing therethrough, the method further comprising the steps of:
- operating the gas turbine engine to drive the gear box and oil system, thereby supplying oil to the engine;
- and
- opening the valve to increase oil flow at low engine speeds to provide adequate oil flow over the sight glass.
Dependencies are inferred from the claim text.