Multi-stage centrifugal pump incorporating a sealed thrust beari

Details Multi-stage centrifugal pump incorporating a sealed thrust beari Multi-stage centrifugal pump incorporating a sealed thrust beari

1992-08-19

1994-08-23

Kwon, John T.

Rotary kinetic fluid motors or pumps

With lubricating, sealing, packing or bearing means having...

415104, 415107, 415111, 415179, 277 3, 277 74, 277 81R, F01D 1104

Patent

active

053402723

ABSTRACT:
A multi-stage centrifugal pump is described having a linear series of impellets mounted on a common impeller shaft, with axial thrusts imparted to the shaft by the impellets being balanced by a sealed high-pressure thrust bearing assembly secured to the pump casing. The pump is particularly suitable for using in pumping an abrasive fluid. A clean lubricating oil is supplied to the thrust bearing assembly at a pressure slightly greater than that of the abrasive pumped fluid, to ensure that the fluid that migrates across a mechanical seal interposed between the impeller assembly and the thrust bearing assembly is the lubricating oil, not the abrasive pumped fluid. High pressure differentials across a breakdown bushing involving the abrasive pumped fluid, and a resulting wear and erosion of pump components, thereby are avoided.

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