Molecular drag pump
US5722819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Jun 27, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D19/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A molecular drag pump comprising a rotor and a stator, the pump being of the type including at least alternating finned stages of the rotor and of the stator, and in which the rotor is bell-shaped, while the stator includes at least one external portion carrying the stator fins and at least one internal portion penetrating into the bell-shaped rotor, said internal portion closing the pump at its delivery end and including a flange-forming external peripheral rim, wherein said external portion of the stator carrying the stator pins is made up of two half-stators that meet in a diametral plane, each half-stator comprising a single piece and being positioned axially by having a bearing surface situated at its end remote from its suction end that hooks into a complementary circular groove of said internal portion of the stator, and wherein the outside diameter of the first finned stage of the rotor at its suction end corresponds, ignoring operating clearance, to the outside diameter of the external portion of the stator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.