Rotary kinetic fluid motors or pumps – Plural runners supported for relative motion or on separate... – Diverse type runners – blade systems or working fluid paths...
Patent
1978-05-15
1981-07-14
Powell, Jr., Everette A.
Rotary kinetic fluid motors or pumps
Plural runners supported for relative motion or on separate...
Diverse type runners, blade systems or working fluid paths...
415 80, 415 83, 415113, F04D 2922
Patent
active
042783968
ABSTRACT:
This invention relates to a centrifugal pump characterized by a pair of novel self-aligning impeller hub seals located in the high pressure cavity and subjected to the influence thereof to maintain them in fluid-tight sealed contact with the adjacent cavity walls to which they are loosely fastened. The invention also encompasses a novel thrust-type hub seal subassembly that is continually biased into fluid-tight sealed contact with an annular abutment on the impeller hub, the latter element being the only surface in relatively movable frictional engagement with the seal with such engagement being face-to-face so that the thrust compensates for any wear therebetween. Another feature of the invention is the cooperative relationship between the self-aligning impeller hub seals, the thrust-type hub seal and pressure relief passages in the impeller hub whereby the thrust seal is isolated from the relatively higher fluid pressure in the high pressure cavity. Finally, one version of the pump has a jet-assisted impeller wherein radial passages therein discharge the working fluid into an annulus which, in turn, discharges into the high pressure cavity through tangentially-directed jets, the thrust of which reduces the torque that would, otherwise, have to be supplied by the pump motor.
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Powell Jr. Everette A.
Spangler, Jr. Edwin L.
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