The stirrer motor, reducer, shaft and blades and other components. Stirring paddle a variety of forms, but regardless of the blade form of mixer operation, the shaft power consumption of a two part role, part of the blade to produce the amount of liquid discharge, another part of the blade pressure head. Pressure head generated by the blade can be divided into two parts, the static head and shear forces; the blender blades during operation, we must overcome the static head, while the shear force the material dispersed, mixed. Therefore, based on blade row of the amount of fluid to overcome the hydrostatic head and produce the size of the shear force capacity, all blades can be divided into three basic types, namely, flow type, the pressure head type and shear type. Each blade in the same time provide some fundamental role (such as the fundamental role of the mobile blades produce a liquid discharge amount), also provide the other two effects (resulting in shear and to overcome the hydrostatic head).