Liquid purification or separation – Structural installation – Closed circulating system
Patent
1977-10-25
1978-06-27
Adee, John
Liquid purification or separation
Structural installation
Closed circulating system
210172, 210297, 210393, 210396, B01D 3306
Patent
active
040973794
ABSTRACT:
The self-cleaning filter assembly includes a collecting tank for receiving a liquid, such as the dirty wash water from a car washing installation, containing suspended or dispersed substances to be removed. The dirty wash water passes through a filter cloth and an underlying layer of a porous, resilient material disposed about the outer periphery of a hollow, perforated drum which is rotatably mounted in the collecting tank. The filtered water passing through the filter material enters the interior of the drum through the drum perforations and is discharged therefrom through the open end of a perforated hollow shaft which serves as the axle for the drum. A roller biased into rolling engagement with the outer surface of the filter cloth presses or squeezes the resilient material, causing a portion of the filtered water retained in the resilient material to be forced back through the filter cloth and dislodge separated substances collected on the filter cloth. The back wash water containing the dislodged substances is collected and discharged from the collecting tank by a tray including a blade portion which is located adjacent the area of contact between the roller and the filter cloth and lightly rides on the outer surface of the filter cloth to "scrape" the wash water from the filter cloth.
REFERENCES:
patent: 1151999 (1915-08-01), Bird
patent: 3426902 (1969-02-01), Kilpert et al.
patent: 3450266 (1969-06-01), Allen
patent: 3616917 (1971-11-01), Hellwege
patent: 3915865 (1975-10-01), Haji et al.
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