Screening apparatus for papermaking pulp

B - Operations – Transporting – 07 – B

Patent

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Details

B07B 1/22 (2006.01) B01D 29/35 (2006.01) B07B 1/20 (2006.01) D21C 9/06 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2154258

A hydrodynamic device for generating negative pressure excursions in a pulp slurry during fine screening, includes a plurality of half-foil members (123) disposed on a substantially cylindrical outer surface of a rotor (121). The rotor (121) is mounted within and co-axial with a substantially cylindrical screen (95) having a circumferentially continuous apertured zone to define an annular screening chamber (93) between the rotor (121) and the screen (95). The half-foil members (123) are collectively at least axially co-extensive with the apertured zone and have a leading edge which, also collectively, is inclined at a spiral angle relative to the axis of the rotor such that during rotation, the collective leading edge of the half-foil members conduct large particles downwardly through the screening chamber. A selection of hydrodynamic foil configurations is provided in order to adapt to a wide range of pulp types and screening conditions.

Un dispositif hydrodynamique, servant à générer des poussées de pression négative dans une suspension de pâte à papier au cours d'une épuration fine, comprend une pluralité de demi-ailerons (123) disposés sur la surface externe sensiblement cylindrique d'un rotor (121). Le rotor (121) est monté à l'intérieur d'un tamis sensiblement cylindrique, de façon coaxiale par rapport à ce dernier, ce tamis présentant une zone à orifices continue dans le sens circonférentiel, définissant une chambre d'épuration annulaire (93) entre le rotor (121) et le tamis (95). Les demi-ailerons (123) s'étendent collectivement, et au moins dans le sens axial, sur la même distance que la zone à orifices, et présentent des bords avant qui sont inclinés, également collectivement, à angles formant une spirale par rapport à l'axe du rotor, de sorte qu'en cours de rotation, les bords avants des demi-ailerons conduisent collectivement les grosses particules vers le bas à travers la chambre d'épuration. Une sélection de configurations d'ailerons hydrodynamiques est prévue afin d'adapter le dispositif à une grande variété de types de pâte et de conditions d'épuration.

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