Vacuum pump with rotor-stator positioning to provide non-return
US9086066B2 · kind B2 · utility
0Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2013 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Oct 14, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2240/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rotary-vane vacuum pump comprises a stator and a vaned rotor, the stator partly defining an outlet chamber and including an outlet passage opening to the outlet chamber. The rotor is rotatably sealed to the stator; it has a sealing area to block the outlet passage, and, an unsealing area alignable with the outlet passage by rotation of the rotor to periodically unblock the outlet passage. The disclosed pump offers reduced resistance to lubricant oil discharge from the outlet passage, which results in lower differential pressure between inlet and outlet chambers at the end of the pumping cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.