The function of the agitator is generally to provide the energy required for the agitation process and the appropriate flow conditions for the purpose of the agitation process. Including homogeneous liquid mixing; liquid-liquid dispersion; gas-liquid dispersion; solid-liquid dispersion; crystallization; solid dissolution; The agitation of the agitator is produced by the moving impeller, so the shape, size, number and speed of the impeller affect the function of the agitator. At the same time, the function of the agitator is also related to the physical properties of the agitating medium and the working environment of the agitator.
The physical properties of the agitation medium and the working environment of the agitator are related. The circulating flow of the liquid in the tank is an indispensable flow state for the mixing of the materials, and the turbulent diffusion and shear flow are required for some agitation processes to quickly achieve the purpose of agitation. Although some suitable flow state is also caused by the mixing tank and other accessories, the shape and operation of the impeller can still be said to be the basic factor determining the flow state in the tank. The shape of various stirring impellers can be divided into three categories according to the direction of movement of the agitator and the surface of the impeller, namely, flat leaves, folded leaves and spiral leaves. Impellers, turbines, anchors, frame-type impellers are flat or folded, while propeller, screw, and ribbon impellers are helical.