Filtration devices

Details Filtration devices Filtration devices

B - Operations, Transporting

01

D

182/58

B01D 33/06 (2006.01) B29C 47/68 (2006.01)

Patent

CA 1193202

- 1 - Abstract of the Disclosure A rotary filtration unit comprises a rotatable generally cylindrical filter drum assembly mounted at one axial end in a chamber formed within a housing having an inlet passage formed for supplying material to be filtered to the cylindrical outer surface of the drum and an outlet passage communicating with the interior of the drum for taking away material filtered by passage through the drum from outside to inside. The drum assembly comp- rises inner and outer filter barrels which retain between them a cylindrical filter element such as of wire gauze or porous sintered metal. The outer barrel has regularly spaced apart relatively large openings in its outer sur- face which communicate through the thickness of the barrel wall and via divergent passageways with even larger openings on the inner surface of the drum. In contrast, the inner barrel has a plurality of much smaller through openings in registry with each of the large openings in the inner surface of the outer barrel. A flushing tube extends into sealing contact with the outer surface of the outer barrel and has an opening which, depending on the angular orientation of the filter drum, either regis- ters with one of the openings therein or with the space between adjacent openings. When the flushing tube is in registry with one of the filter drum openings, clean filtered material can back flush through the drum and flush away into the flushing tube impurities deposited on the filter. The described unit can be used with heavily contaminated material, and can be operated such that out- let pressure fluctuations resulting from the flushing oper- ation are minimized which is particularly advantageous for example where the material being filtered is plastics stock for an extruder producing fine films or filaments.

408749

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