Apparatus for filtering liquids

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 33/21 (2006.01) B01D 29/01 (2006.01) B01D 33/23 (2006.01) D21C 9/18 (2006.01) D21D 5/02 (2006.01) D21F 1/66 (2006.01)

Patent

CA 2069866

An apparatus for filtering liquids, such as fibre pulp suspensions or polluted water, includes annular hollow filter discs (5), each of which has two annular liquid pervious, opposed walls (5, 7) covered with filter material, spray nozzle means (15-17) for cleaning the filter material, and means (12) for providing relative movement between the filter material and the spray nozzle means. The annular opposed walls of each filter disc are only attached to each other at their radially outer ends, whereas they are spaced from each other at their radially inner ends, such that an annular opening is defined between the interior of the filter disc and a filtrate chamber (11) extending centrally through the filter discs. The spray nozzle means (15-17) extends from the filtrate chamber through the annular opening into each filter disc. As a result, an extremely pure fine fraction can be produced, clogging of the filter material is efficiently counteracted, and the operative part of the filter material can be increased.

L'appareil décrit, qui sert à filtrer des liquides tels que des suspensions de pâte de fibres ou de l'eau polluée, comprend des disques de filtrage annulaires creux (5), dont chacun comporte des parois opposées annulaires (6, 7) perméables au liquide et recouvertes d'un matériau de filtrage, des buses de vaporisation (15-17) servant à nettoyer le matériau de filtrage, ainsi qu'un organe (12) servant à établir un mouvement relatif entre le matériau de filtrage et les buses de vaporisation. Les parois opposées annulaires de chaque disque de filtrage sont fixées entre elles uniquement par leurs extrémités radialement externes, tandis qu'elles sont espacées les une des autres à leurs extrémités radialement internes, de sorte qu'une ouverture annulaire est créée entre l'intérieur du disque de filtrage et une chambre (11) pour filtrat qui s'étend au centre à travers les disques de filtrage. Les buses de vaporisation (15-17) s'étendent depuis la chambre pour filtrat à travers l'ouverture annulaire jusque dans chaque disque de filtrage. Grâce à un tel appareil, on peut produire une fraction fine extrêmement pure, on élimine l'engorgement du matériau de filtrage et on peut augmenter la partie fonctionnelle du matériau de filtrage.

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