Fluid machines
US4143999A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | May 11, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump for low head duties includes an impeller portion and a diffuser portion which together define the entire liquid retaining and guidance means between the inlet and the outlet, the impeller serving to raise liquid from a lower reservoir and having a plurality of spiral passages therethrough in which, in operation, a free liquid surface vortex is enabled to form, the diffuser portion leading from the impeller outlet having a rotatable section and an upwardly increasing diameter. The impeller comprising vanes having leading edges extending downwardly and outwardly to provide a liquid inlet providing a substantially unobstructed entry to the vanes and automatic control of the quantity of liquid pumped according to the level of liquid in the lower reservoir. The diffuser portion is driven separately at a speed less than the impeller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.