VORTEX-TYPE MILL Russian patent published in 2000 - IPC

FIELD: equipment for grinding materials in flow of energy-carriers, preferably in air flow. SUBSTANCE: vortex-type mill has cylindrical milling chamber defined by side wall, cover and bottom. At least one energy-carrier nozzle with resonator is positioned in side wall. Nozzle is oriented at an angle to central axis of milling chamber which is equipped with charging and discharge windows. Mill is further provided with central plate-shaped deflector positioned below charging opening in cover. Cross size of deflector exceeds related cross size of charging window by at least 1.1 times or is equal to it. Resonator has high-frequency and low-frequency portions positioned in succession along nozzle. Nozzle for supplying energy-carrier, preferably compressed air, may be made in the form of channel extending through the whole length of continuous body of milling chamber side wall, or in the form of opening in milling chamber side wall and annular casing. Vortex-type mill may be equipped with replaceable annular casings or inserts which allow optimum material grinding mode to be selected by changing length or width of low frequency or high frequency portions of resonator. Longitudinal axis of low frequency portion of resonator is positioned at an angle of 10-20 deg to longitudinal axis of high frequency portion. Deflector may be mounted on stem connected to cover and/or bottom of milling chamber so that distance relative to charging window may be varied. EFFECT: improved grinding quality and enhanced reliability in operation. 6 cl, 2 ex