Pumps – Motor driven – Electric or magnetic motor
Patent
1977-05-11
1979-03-13
Croyle, Carlton R.
Pumps
Motor driven
Electric or magnetic motor
415 72, 415 88, 416177, F04B 1700
Patent
active
041439996
ABSTRACT:
A pump for low head duties includes an impeller portion and a diffuser portion which together define the entire liquid retaining and guidance means between the inlet and the outlet, the impeller serving to raise liquid from a lower reservoir and having a plurality of spiral passages therethrough in which, in operation, a free liquid surface vortex is enabled to form, the diffuser portion leading from the impeller outlet having a rotatable section and an upwardly increasing diameter. The impeller comprising vanes having leading edges extending downwardly and outwardly to provide a liquid inlet providing a substantially unobstructed entry to the vanes and automatic control of the quantity of liquid pumped according to the level of liquid in the lower reservoir. The diffuser portion is driven separately at a speed less than the impeller.
REFERENCES:
patent: 1020382 (1912-03-01), Alpha
patent: 1476210 (1923-12-01), Moody
patent: 1712184 (1929-05-01), Wendel
patent: 2444000 (1948-06-01), Younger
patent: 3221661 (1965-12-01), Swearingen
patent: 3299820 (1967-01-01), Campbell
patent: 3495813 (1970-02-01), Marenghi et l.
patent: 3846516 (1974-11-01), Carlson
patent: 3865721 (1975-02-01), Kaelin
patent: 3875279 (1975-04-01), Kaelin
patent: 3958723 (1976-05-01), Stahle
Croyle Carlton R.
Look Edward
Weir Pumps Limited
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