Vacuum pump with improved back-up bearing assembly

Details Vacuum pump with improved back-up bearing assembly Vacuum pump with improved back-up bearing assembly

1998-03-10

2000-06-06

Thorpe, Timothy S.

Pumps

Motor driven

Electric or magnetic motor

41742312, 384102, 310 90, 310 905, F04B 1700

Patent

active

060710926

ABSTRACT:
A vacuum pump has a back-up bearing assembly for allowing its rotor to spin down safely without damaging the pump if the primary bearing system becomes disabled. The drive shaft of the rotor is tubular and contains the back-up bearing assembly in its hollow interior. Back-up bearings are mounted onto a tubular center shaft which is coaxial with and inside the drive shaft. An axial position sensor is nested inside the center shaft and light emitted from its light emitter is reflected by a reflective target inside the drive shaft to detect the relative axial position of the drive shaft with respect to the center shaft. A polymer sleeve is attached to the end of the drive shaft as a thermal compensator, which restricts the axial movement of the drive shaft.

REFERENCES:
patent: 3071691 (1963-01-01), Haddad
patent: 3650581 (1972-03-01), Boden et al.
patent: 4023920 (1977-05-01), Bachker
patent: 4312628 (1982-01-01), Yamamura
patent: 5059092 (1991-10-01), Kabelitz et al.
patent: 5166566 (1992-11-01), Bernhardt et al.
patent: 5238362 (1993-08-01), Casaro et al.
patent: 5485785 (1996-01-01), Schneider et al.
Patent Abstract of Japan, JP04 072497 A (DAIKIN), Mar. 6, 1992.
FR 2 246 756 A (Leybold Heraeus GmbH & Co Kg) published May 2, 1975 (US counterpart Patent No. 4,023,920).

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