To improve classification efficiency (accuracy, yield and stability of classification) by accelerating dispersion caused by revolutional flow and spiral flow in a feeding dispersion pipe of a dry powder classifying machine.
A constitution wherein, when powdery granule and gas flow together in a feeding despersion pipe for a dry powder classifying machine, a baffle consisting of a baffle-like screw-like shaft impeller is provided at the central part of the feeding dispersion pipe in such a way that it makes revolutional flow and spiral flow without generating sliding flow and the powdery granule does not straightly advance at the central part of the pipe as a mass, is provided. In addition, caused by the revolutional flow, relatively rough powdery granule flows on the pipe wall and relatively fine powdery granule is carried at the central part of the pipe by a faster speed in comparison with that at the pipe wall and as the effective cross section is made larger, the average flow rate is increased by decrease in flow resistance to accelerate mixing and dispersion.
HISAMOTO KENJI
NISHII MASATO
Next Patent: APPARATUS FOR SELECTING PARTICULATE MATTER