Method and apparatus for starting series-coupled vacuum pumps
US4887941A · kind A · utility
13Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1988 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Sep 26, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of starting series-coupled vacuum pumps comprising a primary pump (A) and at least one secondary pump (B) connected between the primary pump and an enclosure (E) in which a vacuum is to be established, the method consisting in starting the primary pump initially and subsequently starting the secondary pump when the suction pressure of the primary pump as reduced by rotation of the primary pump reaches an acceptable value, the method being characterized in that the pressure existing in the secondary pump is determined by using a physical magnitude related to the primary pump and following a law similar to the pressure law.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.