Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1999-03-19
2000-08-15
Coe, Philip R.
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 18, 134 252, 134 56D, 1341041, 1341044, 134111, 134186, A47L 1546
Patent
active
061030171
ABSTRACT:
A dishwasher pump and automatic purge system for a dishwasher having a recirculation pump, a drain pump and a wash chamber having a sump. The recirculation pump includes a main outlet and a secondary outlet wherein wash liquid pumped out through the main outlet is recirculated throughout the dishwasher interior wash chamber during a wash phase. The sump includes a soil collector which receives wash liquid from the secondary outlet. The soil collector includes a filter screen for returning filtered wash liquid back into the sump such that soils are retained in the soil collector. During a first wash phase while the recirculation pump is recirculating wash liquid throughout the wash chamber, the drain pump is energized on and off to drain soils from the soil collector. More specifically, the drain pump is energized on and off during the wash phase in response to the pressure within the soil collector which is sensed by a pressure sensor.
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Bertsch Roger J.
Jarvis Wilbur W.
Thies Edward L.
Coe Philip R.
Rice Robert O.
Roth Thomas J.
Van Winkle Joel M.
Whirlpool Corporation
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