磨粉机泵气现象的分析

Analysis on Phenomenon of Pumping Gas in the Roller Mill

通过对磨辊表面边界层内气体质点分离过程的定性分析,解释了磨粉机采用光辊研磨产生泵气的原因—由于空气存在粘性,贴近磨辊表面的空气被磨辊携带接近轧距区,逐渐积累与压缩,形成不断向上反射的紊流。在面粉厂中采用光辊研磨,泵气问题是难以完全避免的。泵气可以采用降低转速和设计轧距吸风装置等方法使其得到一定程度的抑制。

The phenomenon of pumping gas has been discussed in the roller mill when grinding flour. Viscosity is intrinsic feature in the flowing air, and this phenomenon is not avoided. It is suggested that four measures be made to decrease pumping gas.