Liquid purification or separation – Filter – Movable medium
Patent
1995-02-28
1997-03-04
Nessler, Cynthia L.
Liquid purification or separation
Filter
Movable medium
210400, 210403, 210404, B01D 3346
Patent
active
056075880
ABSTRACT:
An elongate scraper apparatus for scraping filter cake from a moving filter medium of a filter apparatus comprises an elongate bar or scraper having a length sufficient to substantially span the face of the filter medium upon which filter cake is deposited. The bar has a broad, continuous, smooth, front face that is parallel with the surface of the filter medium. The broad, front face of the bar or scraper allows substantial contact with the surface of the filter medium over the entire surface of the front face of the bar or scraper. The elongate bar or scraper further has a top face that forms a chisel edge at the top edge of the front face. The chisel edge points in a direction parallel with the surface of the filter medium. As the filter medium bulges outwardly, it applies uniform pressure on the broad face of the bar or scraper so that the bar or scraper flexes to conform to the contour of the bulging filter medium. The chisel edge of the bar or scraper remains in parallel orientation with the surface of the filter medium so that the chisel edge does not make pointed, contact with the filter medium.
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Crellin Terry M.
Nessler Cynthia L.
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