Two stage vacuum pump with shaft seal
US4540353A · kind A · utility
8Cited by
14References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1984 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Feb 8, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S418/01
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention pertains to a two-stage vacuum pump for servicing refrigeration systems wherein a pair of electrically driven rotors support movable vanes engaging the cylindrical circumference of pumping chambers in which the rotors are mounted. The improvements pertain to the sealing of the rotor shaft, the introduction of metered oil into the pump, and the keying of a rotor to its driveshaft wherein improved assembly and operational characteristics are achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.