1. A ball bearing assembly for supporting a rotor shaft in a gas turbine engine, comprising:
an inner race that couples to the rotor shaft comprising a plurality of inner race lubricant apertures that extend radially through the inner race that supply pressurised lubricant to selected regions within the bearing;
an outer race that couples to a primary static structural support;
a plurality of ball elements between the inner race and the outer race; and
a ball cage to maintain the relative radial spacing of the ball elements between each other within the inner race and the outer race.
2. The ball bearing assembly of claim 1, wherein the inner race lubricant apertures form at least one radial row around the inner race.
3. The ball bearing assembly of claim 2, wherein the inner race lubricant apertures form two radial rows around the inner race.
4. A bearing lubrication system for a gas turbine engine that has bearings supporting a rotor shaft, comprising:
a housing for the engine that serves as a primary static structural support;
a rotor shaft for mounting rotational components of the engine;
at least two bearings for supporting the rotor shaft within the housing, each bearing comprising an inner race that couples to the rotor shaft comprising a plurality of inner race lubricant apertures that extend radially through the inner race that supply pressurised lubricant to selected regions within the bearing, an outer race that couples to a primary static structural support, a plurality of ball elements between the inner race and the outer race and a ball cage to maintain the relative radial spacing of the ball elements between each other within the inner race and the outer race; and
a lubricant distribution system for delivering pressurised lubricant to the inner race apertures in each of the bearings.
5. The bearing lubrication system of claim 4, wherein the lubricant comprises fuel for the engine.
6. The bearing lubrication system of claim 4, wherein the lubricant comprises oil.
7. The bearing lubrication system of claim 4, wherein the lubricant comprises a mixture of fuel for the engine and oil.
8. The bearing lubrication system of claim 4, wherein the lubricant distribution system comprises a lubricant source that supplies the lubricant.
9. The bearing lubrication system of claim 8, wherein the lubricant distribution system further comprises a lubricant pump for pressurising the lubricant.
10. The bearing lubrication system of claim 9, wherein the lubricant distribution system further comprises a pressurised lubricant galley for supplying lubricant to a forward one of the bearings.
11. The bearing lubrication system of claim 9, wherein the lubricant distribution system further comprises a pressurised rotor shaft lubricant channel for supplying lubricant to at least one aft bearing.
12. The bearing lubrication system of claim 4, wherein airflow through the engine propagates lubricant from a forward one of the bearings to at least one aft bearing and into a combustion chamber for the engine.
13. A gas turbine engine comprising:
a housing for the engine that serves as a primary static structural support;
a rotor shaft;
a compressor wheel mounted on the rotor shaft for compressing air;
a combustion chamber for combusting the compressed air with fuel to generate expanding exhaust gas;
a turbine wheel mounted on the rotor shaft driven by the expanding exhaust gas;
at least two bearings for supporting the rotor shaft within the housing, each bearing comprising an inner race that couples to the rotor shaft comprising a plurality of inner race lubricant apertures that extend radially through the inner race that supply pressurised lubricant to selected regions within the bearing, an outer race that couples to a primary static structural support, a plurality of ball elements between the inner race and the outer race and a ball cage to maintain the relative radial spacing of the ball elements between each other within the inner race and the outer race; and
a lubricant distribution system for delivering pressurised lubricant to the inner race apertures in each of the bearings.
14. The engine of claim 13, wherein the lubricant comprises fuel for the engine.
15. The bearing lubrication system of claim 13, wherein the lubricant comprises oil.
16. The engine of claim 13, wherein the lubricant comprises a mixture of fuel for the engine and oil.
17. The engine of claim 13, wherein the lubricant distribution system comprises a lubricant source that supplies the lubricant.
18. The engine of claim 17, wherein the lubricant distribution system further comprises a lubricant pump for pressurising the lubricant.
19. The engine of claim 18, wherein the lubricant distribution system further comprises a pressurised lubricant galley for supplying lubricant to a forward one of the bearings.
20. The engine of claim 18, wherein the lubricant distribution system further comprises a pressurised rotor shaft lubricant channel for supplying lubricant to at least one aft bearing.
21. The bearing lubrication system of claim 13, wherein airflow through the engine propagates lubricant from a forward one of the bearings to at least one aft bearing and into a combustion chamber for the engine.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A process of separating at least two gases or two liquids comprising contacting said gases or liquids with a membrane comprising a copolymer comprising 10 to 99 mol % 2,3,3,3-tetrafluoropropene-based structural units and 1 to 90 mol % vinylidene fluoride-based structural units.
2. The process of claim 1 wherein said membrane comprises a plurality of first repeating units of formula (I):
wherein n and m are independent integers from 100 to 20000.
3. The process of claim 1 wherein said membrane comprises a copolymer comprising 70 to 90 mol % 2,3,3,3-tetrafluoropropene-based structural units and 10 to 30 mol % vinylidene fluoride-based structural units.
4. The process of claim 1 wherein said membrane comprises a copolymer comprising 30 to 70 mol % 2,3,3,3-tetrafluoropropene-based structural units and 30 to 70 mol % vinylidene fluoride-based structural units.
5. The process of claim 1 wherein said membrane further comprises structural units derived from hexafluoropropene.
6. The process of claim 1 wherein said membrane has carbon dioxide permeability of at least 5 Barrers and single-gas CO2CH4 selectivity of at least 40 at 35\xb0 C. under 791 kPa feed pressure
7. The process of claim 1 wherein said gases are separated from natural gas and comprise one or more gases selected from the group consisting of carbon dioxide, oxygen, nitrogen, water vapor, hydrogen sulfide and helium.
8. The process of claim 1 wherein said gases are volatile organic compounds.
9. The process of claim 8 wherein said volatile organic compounds are selected from the group consisting of toluene, xylene and acetone.
10. The process of claim 1 wherein said gases comprise a mixture of carbon dioxide and at least one gas selected from hydrogen, flue gas and natural gas.
11. The process of claim 1 wherein said gases are a mixture of olefins and paraffins or iso and normal paraffins.
12. The process of claim 1 wherein said gases comprise a mixture of gases selected from the group consisting of nitrogen and oxygen, carbon dioxide and methane, hydrogen and methane or carbon monoxide, helium and methane.
13. The process of claim 1 wherein said gases comprise a mixture of hydrogen, nitrogen, methane and argon in ammonia purge gas streams.