Pump having an internal pump

Details Pump having an internal pump Pump having an internal pump

1992-11-19

1994-02-22

Bertsch, Richard A.

Pumps

Motor driven

Including means utilizing pump fluid for augmenting cooling,...

417370, 417372, 417420, F04D 1314

Patent

active

052882136

ABSTRACT:
Pump apparatus having a wear end and a pump end is provided with means for preventing fluid being pumped from entering the wear end. An internal pump is positioned between the wear end and the pump end of sealless pumps to direct small quantities of fluid from the wear end to the pump end at a pressure which prevents fluid in the pump end to pass into the wear end.

REFERENCES:
patent: 3513942 (1970-05-01), Sato
patent: 4812108 (1989-03-01), Kotera
patent: 4990055 (1991-02-01), Korenblit

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