F - Mech Eng,Light,Heat,Weapons – 16 – N
Patent
F - Mech Eng,Light,Heat,Weapons
16
N
184/42
F16N 11/12 (2006.01)
Patent
CA 1254524
POSITIVE DISPLACEMENT PUMP UTILIZED IN LUBE OIL SYSTEM FOR TURBOMACHINERY Abstract of the Disclosure Discloses a backup lube oil pump system for a steam turbine lube oil system. The primary and secondary pump system of the prior art lube oil system normally includes a primary centrifugal pump affixed to the turbine shaft and ac and dc motor-driven pumps to supply lubrication during start-up and shutdown when the primary pump cannot maintain flow due to low rotational speed. If the turbine is coasting down due to an ac power failure, the ac motor-driven backup pump is inoperative. The dc (battery) driven backup pump becomes the only backup left and the failure of batteries if not charged regularly can render it as a poor backup system. In the invention a backup lube oil system having high reliability utilizes a positive displacement lube oil pump driven by a rotor- driven permanent magnet generator. The pump is in parallel with a primary check valve in the lube oil feed line, so that the positive displacement backup lube oil pump is supplying oil at all times to the hsaft bearing. Upon coast-down of the rotor, the PDP driven by the permanent magnet generator maintains a continuous flow of oil to the shaft bearings to a speed which is sufficiently low to prevent bearing damage in case the primary and other backup systems fail to do so.
492195
Dumas Charles R.
Moore James H.
Woodcock Sidney J.
Company General Electric
Eckersley Raymond A.
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