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US 8,281,563 B2Granted
Gas-turbine bearing oil system with improved oil return arrangement
AssigneeRolls-Royce Deutschland Ltd & Co KG
InventorArnaud Pisseloup
Life of this patent
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Abstract
A gas-turbine bearing oil system with an oil supply arrangement includes at least one oil pump 5 supplying oil from an oil tank 1 to the bearing chambers 2, 3, 4 and at least one scavenge pump unit 6 returning oil from the bearing chambers 2, 3, 4 to the oil tank 1 At least one additional electric scavenge pump 7 is used to return oil from at least one bearing chamber 2, 3, 4 to the oil tank 1.
Claims18
A gas turbine bearing oil supply system, comprising:
- at least one oil pump for supplying oil from an oil tank to a plurality of bearing chambers of a gas turbine;
- at least one scavenge pump unit for returning oil from the bearing chambers to the oil tank;
- and
- at least one additional electric scavenge pump for returning oil from at least one of the bearing chambers to the oil tank;
- a separate scavenge line connecting the at least one of the bearing chambers and the at least one additional electric scavenge pump, the separate scavenge line connecting to the at least one of the bearing chambers for evacuation of residual oil from the at least one of the bearing chambers;
- a shut-off device positioned in the separate scavenge line for selectively closing the separate scavenge line.
3 more elements
A method for operating a gas turbine bearing oil supply system, comprising:
- supplying oil from an oil tank to a plurality of bearing chambers with at least one oil pump during operation of the gas turbine;
- returning oil from the bearing chambers to the oil tank with at least one scavenge pump unit during operation of the gas turbine;
- and
- in the event of at least one of running down and shutting down of the gas turbine, returning oil from at least one of the bearing chambers to the oil tank with at least one additional electric scavenge pump;
- providing a separate scavenge line connecting the at least one of the bearing chambers and the at least one additional electric scavenge pump, the separate scavenge line connecting to the at least one of the bearing chambers for evacuation of residual oil from the at least one of the bearing chambers;
- providing a shut-off device positioned in the separate scavenge line for selectively closing the separate scavenge line.
3 more elements
Dependencies are inferred from the claim text.