Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Patent
1997-03-20
2000-05-30
Thorpe, Timothy S.
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
417357, 41742314, 417373, F04B 3906
Patent
active
060684550
ABSTRACT:
A system for pressurizing and pumping a fluid that may undergo substantial variations in temperature utilizes a motor with an enclosed rotor disposed adjacent and in driving relation to a centrifugal pump, but thermally isolated even though the fluid being pumped serves to establish hydrodynamic effects at large journal bearings supporting the rotor and the pump. The rotor is in magnetic interchange relation with an associated stator through a magnetic housing which, together with a pump mount coupling the motor to the pump, is fully encloses, apart from pump inlet and outlet apertures. The pump mount includes a low diameter neck portion about the shaft teat has low axial heat conductivity, thus providing an isolation spacing that also is filled with insulation material to eliminate significant convective heat transfer. Pressurized fluid at the pump is communicated into the motor enclosure only via small gaps, assuring that pressure conditions are maintained, but without affecting the internal motor temperature and the stability or life of the bearings, because of flow mass communication.
REFERENCES:
patent: 3192861 (1965-07-01), Haegh
patent: 5403154 (1995-04-01), Ide
patent: 5522709 (1996-06-01), Rhoades
patent: 5525039 (1996-06-01), Sieghartner
Avallone & Baumeister III, Marks'Standard Handbook for Mechanical Engineers, p. 6-165, 1987.
B E Aerospace
Thorpe Timothy S.
Tyler Cheryl J.
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