Dishwasher with dual pumps

Details Dishwasher with dual pumps Dishwasher with dual pumps

1993-06-17

1994-06-14

Coe, Philip R.

Cleaning and liquid contact with solids

Apparatus

Having self cleaning means

134111, A47L 1522, A47L 1542

Patent

active

053201205

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.

REFERENCES:
patent: 1995635 (1935-03-01), Clark
patent: 2700978 (1955-02-01), Pietsch
patent: 2935207 (1960-05-01), Miller
patent: 3183120 (1965-05-01), Mori
patent: 3807419 (1974-04-01), Cushing et al.
patent: 3810480 (1974-05-01), Smith et al.
patent: 4754770 (1988-07-01), Fornasari
patent: 4848382 (1989-07-01), Bertsch et al.
patent: 4969479 (1990-11-01), Lagerstrand
patent: 4972861 (1990-11-01), Milocco et al.
patent: 5097855 (1992-03-01), Martinsson et al.

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