Patent ID: 6568536
Filing Date: 2003-05-27
Classification: B04C,B07B

Abstract:
A classifier comprising:a dispersion chamber for dispersing a powder material therein which is fed thereinto together with a stream of transportation gas through at least one feed inlet so as to cause a cyclonic flow of said powder material within said dispersion chamber, with finely-divided particles with particle diameters less than a predetermined particle diameter contained in said powder material being separated and discharged therefrom by means of centripetal force, a classification chamber connected to said dispersion chamber so that said powder material free of said finely-divided particles is fed thereinto from said dispersion chamber, which classification chamber serves to classify said powder material free of said finely-divided particles into fine particles and coarse particles by means of centrifugal force, and a conical member disposed between said dispersion chamber and said classification chamber, which serves as a partition therebetween and enhances the cyclonic flow of said powder material within said dispersion chamber, wherein said dispersion chamber comprises particle residence prevention means for preventing said powder material from residing within said dispersion chamber by changing the speed of the cyclonic flow of said powder material in said dispersion chamber so as to be decreased in the direction of said feed inlet within said dispersion chamber.