Pumps – Motor driven – Electric or magnetic motor
Patent
1977-04-11
1979-02-20
Husar, C. J.
Pumps
Motor driven
Electric or magnetic motor
184 618, 417372, 415112, F04B 1700
Patent
active
041404416
ABSTRACT:
A high vacuum turbomolecular pump is described having a lubrication system which assures steady, continuous lubrication of the rotor bearings. The pump includes an outer casing having an upper open end adapted to be communicated hermetically with an isolated environment to be pumped, and an exhaust opening at its lower end. A plurality of vertically spaced stator blade wheels are positioned within the casing intermediate the inlet and exhaust openings, and a rotor is mounted within the casing on a spindle for rotation therewith on a generally vertical axis. The rotor is provided with a plurality of axially spaced rotor blade wheels interleaved with the stator blade wheels. An electrical induction motor is incorporated within the pump for rotating the spindle and, hence, the pump rotor, for high vacuum pumping. Such spindle is supported for rotation by a pair of bearings positioned on opposite sides of the induction motor and has an axial passageway designed to draw fluid lubricant upwardly therealong by centrifugal action during its rotation. The lower end of the spindle extends into a reservoir of fluid lubricant. A cup surrounds the spindle lower end to isolate the exterior of the spindle from lubricant within the reservoir, and a nozzle communicating with the reservoir extends into the inlet orifice of the passageway to feed fluid lubricant into the same without such lubricant having to contact the external rotating surfaces of the spindle.
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Husar C. J.
Zimmerman C. Michael
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