摘要：对涡流空气分级设备的历史进行了回顾 ,并列举了几种有代表性的机型 ,分析了涡流空气分级机的工作原理 ,指出了涡流空气分级机存在的问题和今后发展的方向

关键词：涡流空气分级机；工作原理；分级指示

Abstract ：The development history of the turbo air classifiers is reviewed while listing out several typical turbo air classifiers．Their operation principles are analysed．Some problems existing in these classifiers are also pointed out．The general developing trend in the future is discussed． 

Keywords ：turbo air classifier；operation principle；classifying index