Filter screen assembly and method of filtering constituents from fluid mixtures

摘要

A filter screen assembly for removing particulate material from a slurry in a vessel. Mass producible slotted faced plates are assembled in pairs to enclose a chamber means between two slotted faces, an apertured edge and three closed edges mounted on a collector tube with the chamber in communication with the bore of the tube through said apertured edge, one end of the tube being closed and the other end being in communication with an intake port of a pump and said chambers. A filter media envelopes assembled pairs of slotted faced plates and the portion of the collector tube they are mounted on, while the other portion of the collector tube projects from an opening in said envelope and is sealingly engaged by a collar portion of the media secured against the collector tube. Reduced pressure impressed on the interior of the collector tube causes a slurry of liquid and particulate no greater than a predetermined size to be drawn through the media and slots in the plates. The media is oriented so particulate greater than predetermined size in the slurry exteriorly of the media is not retained against the exterior surface of the media, but settles to form a concentrated sludge in and withdrawable from the tank bottom through a bottom drain. A plurality of assemblies with spaced parallel upright media may be mounted on a manifold to provide large filter area in a small volume.