Vacuum pumps with improved pumping channel configurations
US7628577B2 · kind B2 · utility
1Cited by
12References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 2006 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Dec 19, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/542
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum pump includes a housing having an inlet port and an exhaust port, at least one molecular drag stage within the housing, the molecular drag stage including a rotor and a stator that defines a tangential flow channel which opens onto a surface of the rotor, and a motor that rotates the rotor so that gas is pumped from the inlet port to the exhaust port. The stator defines one or more obstructions in the channel. The obstructions alter gas flow through the channel and produce turbulence under viscous or partially viscous flow conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.