Vacuum pumps
US6244841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1998 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2220/10
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum pump comprising a pump chamber having an inlet and an outlet and through which gas from an enclosure connectable to the inlet can be pumped to a pump exhaust. At least one rotor, adapted for high velocity rotation, is provided within the chamber and mounted on a shaft extending from the chamber and to a pump gearbox substantially isolated from the chamber by means of a shaft seal associated with the shaft. The shaft seal is of a close tolerance but non-contact design. During use of the pump, gas pressure in the vicinity of the shaft seals and arising from the changeable gas pressures associated with operation of the pump rotor is buffered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.