关键词: 涡流空气分级机, 窄级别, 转速差, 二次风

Abstract: On the basis of establishing the narrow level experimental system of turbo air classifier，and in order to study the effects of process parameters on particle size distribution and productivity of narrow level product in turbo air classifier，the rotation speed difference of two-stage rotor cages and the second wind speed of the second classifier were used as experimental factors. Particle size distribution curve of the product was used as experimental index. Narrow level experiment system of turbo air classifier was investigated. The experimental results showed that with the rotation speed difference decreasing，the particle size distribution curve of the product became narrower. When the second wind speed increased，the content of the fine powder of product reduced and the particle size distribution curve of the product became narrower. In addition，the relationship among productivity，uniformity of narrow level product and rotation speed difference was studied. Results showed that with rotation speed difference decreasing，productivity of narrow level product decreased and the uniformity increased. Further study indicated that there was a best rotation speed difference ?n0，under which product could be able to both meet the requirement of uniformity and productivity.

Key words: vortex air classifier, narrow level, rotation speed difference, the second wird