Turbomolecular pump with improved bearing assembly

Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part

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384114, F04D 2904

Patent

active

047672650

ABSTRACT:
A single ended turbomolecular vacuum pump operable in the free molecular flow pressure range having an improved bearing assembly between the motor rotor and the pump rotor discs is disclosed. The improved bearing assembly which is of the "plain" or "sleeve" liquid lubricated type has a relatively high ratio of journal diameter to bearing axial length. The improved bearing assembly is characterized by improved heat transmission capabilities, high tolerance for misalignment and long life.

REFERENCES:
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patent: 4427309 (1984-01-01), Blake
Baumeister, et al., Mark's Standard Handbook for Mechanical Engineers 8th Ed., 1978, McGraw Hill, pp. 8-120 to 8-126 "Fluid Film Bearings".
Creamer, R. H. Machine Design, 2nd Ed., 1976, Addison-Wesley Publishing, pp. 77 to 79 "Bearings".
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Osterstrom, G. Methods of Experimental Physics, vol. 14, 1979, Academic Press, pp. 247-274 "Turbomolecular Vacuum Pumps".

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