Canned motor pump

Details Canned motor pump Canned motor pump

1991-11-12

1993-10-26

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

41742314, F04B 1700, F04B 3504

Patent

active

052560384

ABSTRACT:
In order to restrict flow between the motor and pump of canned motor pump, a seal arrangement is provided for use with a canned motor pump which has a motor disposed within a motor housing and an axially extending output shaft for rotating an auxiliary impeller to circulate fluid from an external supply to cool and lubricate the motor. A pump housing is abutted with the motor housing and surrounds a main impeller which is seated on the motor shaft. A seal assembly is provided to minimize the leakage between the pump housing and the motor housing and includes a pair of axially spaced bushing seals which surround the motor output shaft and define an annular reference cavity between the seals. A passageway connects the pump outlet and the reference cavity to permit the motor fluid to reference pump discharge pressure without subjecting the impeller to increased axial thrust.

REFERENCES:
patent: 2448717 (1948-09-01), Jeffcock
patent: 3090546 (1963-05-01), Woollenweber, Jr.
patent: 3180568 (1965-04-01), Oettle
patent: 3318253 (1967-05-01), Campolong
patent: 3395645 (1968-08-01), Vilet
patent: 3544116 (1970-12-01), Peterson
patent: 4521151 (1985-06-01), Frater et al.
patent: 4621981 (1986-11-01), Lorett
patent: 4990055 (1991-02-01), Korenblit

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