Grinder pump
US4454993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Jan 25, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C18/0092
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved grinder pump of the water immersed type is disclosed which includes a motor driven semi-open type pump impeller, a grinder ring fitted and firmly mounted in the suction port at the bottom of the pump casing, the grinder ring being provided with a plurality of axially extending grinding grooves and edges on the inner surface thereof, and a grinder impeller fixedly screwed on the distal end of the pump shaft to be coupled to the pump impeller in an end-to-end relation, the grinder impeller being provided with at least two axially extending grinding blades provided on the lower conical surface of the hub thereof so that any foreign material contained in the pumping liquid is ground or shredded into smaller pieces by cooperation of the grinding edges of the grinder ring with the grinding blades of the grinder impeller. A plurality of radially extending auxiliary blades are provided on the upper surface of the hub of the grinder impeller so as to perform additional pumping and grinding operation. The grinding blades protrude downwardly beyond the bottom of the grinder ring to provide the additional effect of ensuring to prevent foreign material in the pumping liquid from dir…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.