Powder pump with internal valve
US5037247A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Nov 29, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B7/1472
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A powder pumping apparatus including a pump body formed with a pumping chamber having a venturi passageway, a suction tube intersecting the pumping chamber and an air nozzle including a valve mechanism which discharges pressurized air directly into the venturi passageway of the pumping chamber to create a vacuum within the pumping chamber and suction tube to withdraw particulate powder material from a powder feed hopper. The air nozzle is carried within the interior of the pump body and has a discharge outlet located within the pumping chamber which discharges a substantially constant pressure pulse of air directly into the venturi passageway of the pumping chamber. In turn, a sharp, well-defined powder pulse is produced having a substantially homogeneous powder-to-air density throughout the duration of the pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.