Dishwasher with dual pumps
US5320120A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1993 |
| Grant date | Jun 14, 1994 |
| Priority date | — |
| Expiry date | Jun 17, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47L15/4225
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A dishwashing machine includes a wash chamber and spray distribution mechanism to spray fluid over articles in the chamber. A recirculation sump at the bottom of the chamber receives fluid from the chamber and a first pump, driven by a relatively large motor, draws fluid from the sump and discharges it to the spray mechanism. A filter is positioned to remove soil particles from the recirculated fluid and a collection chamber collects filtered soil particles. The collection chamber is connected to a drain through a first one way valve. A drain pump, driven by a relatively small motor, is connected between the lower portion of the recirculation sump and the collection chamber. Another one way valve permits flow from the recirculation sump to the collection chamber while preventing reverse flow. Operation of the drain pump substantially completely evacuates fluid from the wash chamber and the sump through the collection chamber to the drain and concurrently discharges soil particles from the collection chamber to the drain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.