Pumps – Motor driven – Electric or magnetic motor
Patent
1992-05-12
1993-10-19
Bertsch, Richard A.
Pumps
Motor driven
Electric or magnetic motor
4174239, 41742311, 41742312, 415143, 4151701, 415106, F04B 1700
Patent
active
052539865
ABSTRACT:
An impeller-type pump system includes a housing defining a pump chamber and a fluid inlet communicating with the chamber. An impeller is rotatably mounted in the pump chamber downstream of the inlet. The impeller includes a rear magnet hub mounting an axially facing driven magnetic coupling. Bearings are provided about the outside of the impeller for rotatably mounting the impeller in the pump chamber. Ceramic barrier discs are located behind the impeller to define a closure sealing the rear of the pump chamber. Ball bearings are mounted in a cup-shaped recess in the rear face of the magnet hub and bearing against the ceramic barrier discs at least during start-up of the pump. The sidewalls of the recess diverge away from the ceramic barrier discs, whereby the ball bearings move away from the ceramic barrier discs under centrifugal force in response to rotation of the impeller.
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Bond John C.
Gravelle Homer E.
Mabe William J.
Bertsch Richard A.
McAndrews Roland
Milton Roy Company
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