Pumps – Motor driven – Pump fluid communicates with sealed chamber containing armature
Patent
1986-05-07
1987-08-04
Croyle, Carlton R.
Pumps
Motor driven
Pump fluid communicates with sealed chamber containing armature
417366, 417370, F04B 1700, F04B 3504
Patent
active
046843299
ABSTRACT:
A canned motor pump has a pump section and a canned motor section connected thereto. A portion of the liquid from the pump section is diverted past a front bearing of the pump shaft and then back into the pump intake. Another portion of diverted liquid flows between the stator and the rotor in the canned motor section, and then past a rear shaft bearing, and then is returned to the pump intake. The resistance to flow of the liquid past the front bearing is made substantially greater than that past the rear bearing, so that the total flow diverted from the pump section for purpose of lubricating the front and rear bearings is substantially less than if the two resistances were equal. The resistance to liquid flow of the rear bearing can be reduced by providing it with straight channels parallel to the axis of shaft rotation, or helical channels in the direction the liquid tends to flow. The front bearing can be free from such channels, or can be provided with a helical channel in a direction in which it is different for the liquid to flow.
REFERENCES:
patent: 2190246 (1940-02-01), Schirmer
patent: 2669187 (1954-02-01), Guyer
patent: 2939399 (1960-06-01), Rutschi
patent: 3031973 (1962-05-01), Kramer
patent: 3220349 (1965-11-01), White
patent: 3225698 (1965-12-01), Spisiak
patent: 3280750 (1966-10-01), White
patent: 4047847 (1977-09-01), Oikawa
Croyle Carlton R.
Nikkiso Co. Ltd.
Stout Donald E.
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