摘要：对近年来空气分级机的研发情况进行总结和分析,包括空气分级机的评价标准、各类空气分级机的代表机型及其改进、以及新机型的研究现状等。分析得出,重力分级主要用于颗粒粗分,操作弹性较大,流场和结构简单,通过增加内构件或实现多次分离可显著提升其分级效率;流化床分级理论研究取得很大进步,但工业应用较少,需尽快实现工业转化;惯性分级和动态分级效率较高,近年来对其结构参数与流场模型的研究使其不断向超细粉体分级迈进,研发的新机型较多但持续性研究较少。随着对分级精度、经济性、能耗及环保等要求的提高,未来空气分级机应朝着调控分级流场、优化分离过程和多流型耦合分级的方向发展。

关键词：颗粒物料；空气分级；评价标准；结构参数；流场模型

Abstract: This review summarizes the research and development of air classifiers in recent years，including the assessment standards of air classifiers，representative models and their improvements，as well as the research of new models． It is found that gravity classifiers are mainly used for coarse particle separation with greater operating flexibility，simple flow fields and structures，and their classification efficiency can be significantly improved by adding internals or achieving multiple separations． The theory of fluidized bed classifiers has made great progress，nevertheless there are few applications， so the industrial transformation needs to be realized as soon as possible． The efficiency of inertial classifiers and dynamic classifiers are relatively high，and the research on their structure parameters and flow fields has led to ultrafine powder classification． Many new structures have been proposed，but there are few continuous studies． With the improvements of classification fineness，profits，energy conservation and environmental requirements，the development direction of air classifier in the future is to standardize the flow field，to optimize the separation process as well as to couple multi-mechanism classification in one equipment． 

Keywords: granular materials; air classification; assessment standard; structure parameter; flow field