Multistage roots-type vacuum pump
US7491041B2 · kind B2 · utility
3Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2006 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Oct 6, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C25/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention reduces power consumption and makes a rotor with ease. As illustrated in FIG. 2, a multistage roots pump (1) in the invention includes upstream rotors (R1a, R1b, R2a, R2b) having multiple teeth, supported by a pair of revolving shafts (A1, A2); and downstream rotors (R3a, R3b-R5a, R5b) having an identical number of teeth (31) with the upstream rotors, supported by revolving shafts (A1, A2). The discharge area formed by the outer periphery of the downstream rotors (R3a, R3b-R5a, R5b) and the inner periphewy of the pump chambers (P1-P5) is smaller than that of the upstream rotors (R1a, R1b, R2a, R2b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.