Patent ID: 8668091

Claim:
An air classifier, comprising: a cylindrical casing provided with a powder material feed port configured to feed high pressure air with a powder material at an upper part of the casing; a center core arranged in the casing and having an umbrella shape; a separator core arranged downstream of the center core in the casing and having an umbrella shape, the separator core including an opening formed at a center portion thereof; a dispersion chamber configured to disperse the powder material fed with the high pressure air, the dispersion chamber being surrounded by an inner wall of the upper part of the casing and the center core and being placed at a same height of the powder material feed port; and a classification chamber configured to classify the powder material flowing in from the dispersion chamber into a fine powder and a coarse powder by centrifugation, the classification chamber being surrounded by the center core, the separator core and the inner wall of the casing, wherein the dispersion chamber includes a louver ring having a plurality of guide slats circularly arranged at regular intervals, wherein the dispersion chamber includes a space which encircles the louver ring and serves as a flow passage of the high pressure air and powder material fed from the powder material feed port, wherein the louver ring is upstream of the center core, and wherein the center core includes a fine powder discharge pipe that extends through the center core and above a highest apex of the center core, the center core having the umbrella shape and being arranged upstream of the separator core having the umbrella shape.