Vacuum pump
US6755611B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Nov 14, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2250/70
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum pump has a casing having an interior space, an inlet port for introducing gas molecules into the interior space, and an outlet port for discharging the gas molecules from the interior space. A rotor shaft extends into the interior space of the casing for undergoing rotation about a rotational axis. A stator is connected to the casing and has stator blades extending into the interior space of the casing. A rotor is disposed between the casing and the rotor shaft. The rotor has a preselected number of rotor blades disposed at an uppermost stage thereof and alternately disposed between the stator blades for undergoing rotation with the rotor shaft to direct gas molecules toward the outlet port. A rotational member is disposed between the inlet port and the rotor for undergoing rotation with the rotor shaft about the rotational axis. The rotational member has a generally conical-shaped surface gradually decreasing toward the inlet port. Guiding blades are disposed on the conical-shaped surface of the rotational member for undergoing rotation with the rotational member about the rotational axis to impart movement to the gas molecules in the interior space of the casing in a rad…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.