Dishwasher pump and filtration system
US5377707A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Nov 1, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L15/4227
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A reversibly operated dual impeller pump which simultaneously pumps and filters wash liquid. The pump includes upper and lower assemblies. The upper assembly defines a recirculation impeller chamber and a filter chamber which are separated by a cylindrical wall. A recirculation impeller housed within the recirculation impeller chamber pumps wash liquid, a majority of the pumped wash liquid being directed toward one or more wash rotatably mounted arms while a portion of the pumped wash liquid is supplied to the filtration chamber via a hole in the cylindrical wall. A novel vane structure is provided to direct the pumped wash liquid from the recirculation impeller to the wash arm. The lower assembly includes a lower pump housing, a separator plate, and a macerator assembly. The macerator assembly includes a vertical cylindrical wall which spaces the macerator blade from a bottom of the lower pump housing to prevent damaging contact between heavy or settled material and the blade. The macerator assembly also includes a drain impeller which, when the pump is operated in a recirculation mode, pumps wash liquid to the filtration chamber and, when the pump is operated in the drain mode, p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.