Rotary kinetic fluid motors or pumps – Smooth runner surface for working fluid frictional contact
Patent
1998-03-10
2000-06-13
Look, Edward K.
Rotary kinetic fluid motors or pumps
Smooth runner surface for working fluid frictional contact
415 90, 415111, 415229, 415230, 4151701, 384101, 384102, 310 905, F01D 2516, F03B 1106, F04D 2904
Patent
active
060741651
ABSTRACT:
A vacuum pump is provided with back-up bearings in addition to magnetic bearings for supporting its rotor with respect to the pump housing. The rotor has a hollow rotary shaft extending backwards enclosing in its inner space a forwardly protruding tubular shaft affixed to the pump housing, and another cylindrical member affixed to the rotor protrudes backward inside this fixed tubular shaft. One set of back-up bearings is provided on the outer surface of the fixed tubular shaft spaced from the inner surface of the rotor shaft and another set of back-up bearings is provided on the inner surface of the fixed tubular shaft, spaced from the protruding cylindrical member. The back-up bearings thus positioned can be made smaller for improved dynamic emergency capabilities.
REFERENCES:
patent: 4023920 (1977-05-01), Bachler et al.
patent: 4312628 (1982-01-01), Yamamura
patent: 5165872 (1992-11-01), Fleischmann et al.
patent: 5238362 (1993-08-01), Casaro et al.
patent: 5747907 (1998-05-01), Miller
Casaro Fausto
Laager Alain
Siegwart Roland
Barton Rhonda
Fishman Bella
Look Edward K.
Varian Inc.
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