Liquid purification or separation – Filter – Movable medium
Patent
1979-06-11
1980-12-30
Sever, Frank
Liquid purification or separation
Filter
Movable medium
B01D 3304
Patent
active
042422051
ABSTRACT:
A system for filtering contaminated liquid comprises a filter box submerged in a tank of contaminated liquid and provided with a perforate surface in its top wall. A conveyor-driven endless loop filter belt encompasses the filter box, with the pump-induced or static pressure differential between the tank and the filter box causing liquid to flow downward through the belt into the inlet opening. Control means are provided for automatically indexing the filter web in response to an excessive build-up of filter cake over the filter box inlet. The longitudinally extending edges of the filter web are held downwardly against the filter box by a chain which is selectively advanced with the web-driving chain by means of flight bars extending through the links of both chains. In one embodiment of the invention, the filter box is also provided with an inlet opening in its bottom wall, to increase the filtration capacity, and means are provided for resiliently biasing the hold-down chain upwardly against the longitudinal edges of the lower reach of the filter web, to prevent liquid from by-passing the filter web. A further embodiment of the present invention is adapted for the additional use of a disposable filter media, interposed between the endless loop filter web and the hold-down chain.
REFERENCES:
patent: 1332305 (1920-03-01), Ross
patent: 3206030 (1965-09-01), Estabrook
patent: 3506128 (1970-04-01), Pashaian et al.
patent: 3570674 (1971-03-01), Dahlem
patent: 3756378 (1973-09-01), Kuehl et al.
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