Importance

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Abstract

A filtering device for filtering solids from liquids or liquid-like materials comprising a housing within which a filter member is rotatably mounted. The filter member which is traversed radially by the material to be filtered, comprises an outer sleeve member, a fine filter sleeve, a support filter sleeve and an inner sleeve member or drum. The outer sleeve member includes bores which receive the material to be filtered and has an external surface which is cylindrical. The filtrate, that is to say, the liquid or liquid-like material, passes through the filter member into the interior of the drum and then travels axially along the drum to a discharge outlet. At least the fine filter sleeve and the support filter sleeve taper conically inwardly in a direction towards the outlet. The solid material remains in the bores. As the filter member rotates, these bores become aligned with back-rinsing bores of conduits formed in the housing and the solid material is forced into such conduits by the back-pressure set up by the liquid material in the filter member. The conduits are closable by means of slidably displaceable pistons located therein, the pistons and conduits having sealing means which co-operate in one position of the pistons.

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First Claim