Rotary, self-priming, liquip pump, and an impellers and shaft assembly therefor, and a flexible-impeller pump assembly
US5599171A · kind A · utility
9Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 1995 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | May 15, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D9/041
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump housing has a plurality of chambers formed therein, and a shaft journaled within, the shaft having impellers keyed thereto. Each chamber has one of the impellers disposed therein. One of the impellers is the primary liquid-working element, and has rigid vanes. The vanes are generously spaced apart from the enclosing chamber walls. A second impeller has flexible vanes, and serves as a priming element; it has an intimate fit in its chamber and cooperates with an outlet flapper valve to create a negative pressure in the liquid inlet. Consequently, the pump can self-prime even when absolutely dry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.