Turbomolecular vacuum pump
US5542825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Aug 18, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D25/0606
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A turbomolecular pump comprising a stator and a rotor, said rotor comprising a central shaft and a bell-shaped active portion, said stator comprising an outer portion and an inner portion that penetrates into the cavity of said bell-shaped active portion, and that supports the stator portion of the drive motor, the shaft of said rotor supporting the rotor portion of said drive motor, wherein said central shaft and the bell-shaped active portion of the rotor are made in one piece, without any assembly being necessary, and of a non-magnetic material, said shaft being provided with a central bore which receives the rotor portion of said drive motor, which portion is constituted by a cylindrical permanent magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.