Importance

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Abstract

Pressure filter for filtering pulp which pressure filter comprises a pulp container (1, 3) comprising a feed opening (12) of the pulp at its upper part, a cylindrical filtering surface (6) adjusted to the cylinder part of the container in which case the pulp, which has penetrated the mentioned surface, can be removed from the container through one removal aggregate or through several removal aggregates (13), (14) located at various altitudes, further the pulp container comprises a vertical rotor (8, 16, 17) which can be rotated in the pulp room of the container which rotor is equipped with wings (7) which clean the filtering surface (6) and comprises a feed pipe (11) of the dilution water for directing the dilution water into the pulp room of the container in order to avoid the thickening of the pulp and that the dilution water can be directed between the rotor and the filtering surface (6) to such height that beginning from the lower edge of the filtering surface (6) at least an essential part of the filtering surface, such as over 30% of the filtering surface (6) comes within the range of the mass which has been diluted with the dilution water. The rotor (8, 16, 17) is equipped with wings (9) in that part of the pulp room to which the dilution water is directed in which case the mentioned wings (9) are adjusted together with the gaps (10) to achieve an internal, vertical pulp cycle at the lower part of the pulp room when the rotor is rotating in which case the mentioned part of over 30% of the filtering surface (6) is within the range of the mentioned pulp cycle.

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