| 主权项 |
1. A disc filter for dewatering cellulose fiber suspensions comprising:
a vessel (2) having an inlet (3) for introducing the suspension into the vessel; a rotor unit (6) located in the vessel (2), the rotor unit comprising a rotatable rotor shaft (7), which is provided with filtrate channels (14) extending axially therein, and one or more disc-shaped filter elements (11) carried by said rotor shaft (7) in order to rotate together with the rotor shaft while being partly immersed in the suspension received in the vessel, each filter element (11) extending at an angle to the longitudinal axis of the rotor shaft (7) and comprising several filter sectors (12) distributed about the rotor shaft, wherein each filter element (11) is provided with an external filtering lining (13) and internal flow channels communicating with said filtrate channels (14) in the rotor shaft in order to convey filtrate that passes through the filtering lining to said filtrate channels (14); loosening members (25) for loosening fibre material that has been filtered out of the suspension and deposited on the filtering lining (13) of the respective filter element (11); cleaning members (26) for cleaning the filtering lining (13) of the respective filter elements (11) by means of flushing liquid emitted from the cleaning members; and a plurality of receiver chutes (30), wherein each filter element (11) has a first receiver chute (30) located alongside of a part of the filtering lining (13) on a first side of the filter element and another receiver chute (30) located alongside of a part of the filtering lining (13) on the opposite side of the filter element; characterized in: that said receiver chutes (30) are located in the part of the vessel (2) where the filter sectors (12), during the rotation of the rotor unit (6), are rotated down into the suspension from a position above the suspension; that said cleaning members (26) are located above the receiver chutes (30) and configured to flush the fibre material loosened by the loosening members (25) down into the receiver chutes (30) by means of said flushing liquid; and that the receiver chutes (30) are configured to receive said fibre material together with flushing liquid from the cleaning member (26) to thereby allow the fibre material to be diluted in the receiver chutes to a desired dry content by means of this flushing liquid, wherein said inlet (3) comprises several inlet openings (41) located in the part of the vessel (2) where the filter sectors (12), during the rotation of the rotor unit (6), are rotated down into the suspension from a position above the suspension, the inlet openings (41) being configured to introduce the suspension into the spaces (36) between the receiver chutes (30), and said inlet (3) and its inlet openings (41) are configured to make the suspension flow into the vessel (2) in a direction conforming to the rotational direction of the filter elements (11), said inlet (3) comprising several inlet channels (40) located in the vessel (2) in the part of the vessel where the filter sectors (12), during the rotation of the rotor unit (6), are rotated down into the suspension from a position above the suspension, each inlet channel (40) extending vertically alongside of one of said receiver chutes (30) with the inlet channel (40) located between the receiver chute and an adjacent part of the peripheral wall (18) of the vessel (2); and wherein said inlet openings (41) are located at the upper part of the inlet channels (40) to allow the suspension to flow from the inlet channels and into the spaces (36) between the receiver chutes (30) through these inlet openings (41), each said inlet channel having a roof (43) whereby said flushing liquid and said fibre material are prevented from falling into said inlet channels. |
