Classifier apparatus for particulate matter/powder classifier

摘要

A powder classifier which includes a classifier rotor fixedly secured to a rotatable shaft and having (i) an interior portion defined by upper and lower plates and (ii) an impeller wheel having upper and lower surfaces and a plurality of vanes therethrough. The upper plate has a rounded outer edge along its outer circumference, and the interior portion is in communication with a fine particle discharge outlet. First and second annular rings are concentrically disposed about the outer circumference of the classifier rotor, with the first annular ring being positioned so that a preclassification of a feed powder stream occurs at the first gap such that a fraction of fine particles is separated from the feed stream and flows through the first gap and into the interior portion of the classifier rotor for primary classification, A dispersion disk which rotates independently from the classifier rotor is provided to produce various degrees of dispersion intensities and disperses feed powders prior to classification. Also, air guide vanes are provided in the second annular ring to create vortex flow to achieve secondary classification for recovering fines.