Positive displacement pump utilized in lube oil system for turbo

Details Positive displacement pump utilized in lube oil system for turbo Positive displacement pump utilized in lube oil system for turbo

1984-06-28

1986-12-16

Smith, Leonard E.

Lubrication

Systems

With machine starting means

184 64, 184 611, 184 272, 417201, F01D 2520, F01M 102

Patent

active

046290338

ABSTRACT:
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 shaft 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.

REFERENCES:
patent: 1647135 (1927-11-01), Johnson
patent: 2245175 (1941-06-01), Bany
patent: 2440980 (1948-05-01), Sheppard
patent: 4446377 (1984-05-01), Kure-Jensen et al.

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