Vacuum pump
US6290457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/324
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum pump has a rotor body having multiple stages of rotor blades each comprising a plurality of open-ended blades. The uppermost rotor blade formed on the rotor body is located in a position corresponding to a conical portion in a casing. The tip end of the rotor blade is inclined at the same angle as an inclination angle of the conical portion. Accordingly, gas molecules accelerated at the tip end of the rotor blade in a gas molecular region are unlikely to impinge on the casing, and are prevented from staying so that deterioration in discharge capabilities at the tip end can be suppressed. The uppermost rotor blade is located at the conical portion, making it possible to effectively transport the gas molecules toward the outer periphery of the second and following rotor blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.