Centrifugal pump with integral seal pressure balance

Abstract

Abstract An axially balanced multistage centrifugal pump having an impeller assembly of plural impellers fixed on a shaft which is rotatably and axially mounted within an elongated divided pump case formed of first and second cast metal housings and having fluid pressure stage dividers disposed between the impellers to form fluid pressure stages, whereby the pump in operation will contain fluid at a lower pressure at a first end of the housing and fluid at a higher pressure at the second end thereof; first and second rotary fluid flow restriction seals mounted between the assembled case and the impeller shaft at the first and the second ends of the casing respectively to restrict fluid flow therebetween; a rotary fluid flow restriction baffle mounted within the second end of the case containing the higher fluid pressure and around the shaft near the second rotary seal to define a seal pressure chamber. The improvement comprises an integral fluid pressure balance passageway integrally defined and incorporated within the wall of one of the housings, which passageway will be in fluid communication with the fluid under pressure contained in the seal chamber at the second end of the pump and with the lower pressure fluid contained at the first end of the pump, whereby fluid pressure exerted against the second seal and the first seal will be equalized at the same lower pressure contained at the first end of the pump.

Inventors

• 👤 H Onal

Bibliographic Details