AIR CLASSIFIER Russian patent published in 2001 - IPC

FIELD: processes of separation of granular materials according to the size by ascending current of air, applicable for fractionation of granular materials in mining, chemical, grain processing, food, building and other branches of industry. SUBSTANCE: the air classifier has a body, material feed pipe connection located in the upper part of the body, air feed pipe connection located in the lower part of the body, finished product pipe connections located in the upper and lower parts of the body, a set of perforated contact members positioned inside the body, each contact members positioned inside the body, each contact member of the set is made in the form of two-slope shelves installed in the same level and shifted relative to one another in plan by half the body width; each contact member is installed in a spaced relation to the body side walls, each subsequent contact member is turned relative to the previous one by 180 deg. EFFECT: enhanced capacity and quality of separation. 4 dwg