Pump for abrasive materials
US5267830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Oct 13, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D13/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump for handling abrasive materials includes a housing having two chambers. A shaft mounts a high pressure impeller and a high volume impeller in respective chambers of the housing, each chamber having a separate and opposite inlet. A channel is provided to divert a portion of the flow generated by the high pressure impeller to a purge ring adjacent the primary inlet corresponding to the high volume impeller. The purge ring directs a flow of relatively abrasive-free liquid toward the inlet to reduce wear on the housing and high-volume impeller. Another part of the flow from the high pressure impeller is diverted through the housing to isolate portions of the housing and the high volume impeller from the abrasive material laden intake through the primary inlet. The invention also includes a method of dredging abrasive materials which includes immersing a pump into a liquid in proximity to a deposit of abrasive materials, directing a first flow of liquid containing abrasive materials into a primary inlet of the pump and directing a second, relatively abrasive-free flow of liquid into a secondary inlet, circulating a portion of the abrasive-free flow toward the intake, and combinin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.