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US 9,282,874 B2Granted
Rotary drum filter for a dishwashing machine
AssigneeWhirlpool Corporation
InventorsJordan R. Fountain, Dennis Kehl
Life of this patent
Estimating the term…
Abstract
A dishwashing machine includes a sump chamber, a porous sheet enclosing a hollow interior, and a scraper in contact with the porous sheet. A portion of the sheet extends into the sump chamber. The sheet is operable to rotate about an imaginary axis.
Claims17
A method of operating a dishwashing machine, comprising the steps of:
- expelling wash fluid from a spray arm onto dishware positioned in a washing chamber,
- removing soil particles located on the dishware with wash fluid,
- collecting wash fluid and soil particles in a sump chamber,
- advancing a porous sheet through the sump chamber such that soil particles accumulate on an outer surface of the porous sheet and wash fluid passes through the porous sheet, wherein advancing the porous sheet includes rotating the porous sheet about a substantially horizontal imaginary axis, and
- scraping the outer surface of the porous sheet with a scraper to remove accumulated soil particles from the outer surface during the advancement of the porous sheet through the sump chamber.
2 more elements
A method of operating a dishwashing machine, comprising the steps of:
- expelling wash fluid from a spray arm onto dishware positioned in a washing chamber,
- removing soil particles located on the dishware with wash fluid,
- collecting the soil particles in a sump chamber,
- advancing a porous sheet through the sump chamber such that soil particles accumulate on an outer surface of the porous sheet and wash fluid passes through the porous sheet, wherein advancing the porous sheet includes rotating the porous sheet about a substantially horizontal imaginary axis,
- scraping the outer surface of the porous sheet with a first scraper blade to remove accumulated soil particles from the outer surface during advancement of the porous sheet through the sump chamber, and
- scraping an inner surface of the porous sheet with a second scraper blade.
3 more elements
A method of operating a dishwashing machine, comprising the steps of:
- expelling wash fluid from a spray arm onto dishware positioned in a washing chamber of the dishwashing machine,
- removing soil particles located on the dishware with wash fluid,
- collecting wash fluid and soil particles in a sump chamber,
- advancing a cylindrical drum through the sump chamber such that soil particles accumulate on an outer surface of a filter sheet and wash fluid passes through the filter sheet, the filter sheet extending from a first end of the drum to a second end of the drum, wherein advancing the drum includes rotating the drum about an imagine axis parallel to a bottom surface of the washing chamber,
- scraping the outer porous surface of the filter sheet with a first scraper blade, and
- scraping an inner porous surface of the filter sheet with a second scraper blade.
3 more elements
Dependencies are inferred from the claim text.