The role of "Axial Fan" impeller and centrifugal impeller, is to improve the fluid energy component, and its high structural strength requirements. It is mainly composed by the blade and the hub. 4-6 pieces usually have the impeller airfoil blades, a fixed blade, semi-adjustable and full adjustment type three, currently used for the latter two. They can be adjusted within a certain range by adjusting the flow rate of the moving blade mounting angle. Semi-adjustable only after stopping the pump is adjusted by changing the manual positioning pin position. Full adjustable blade impeller with rotor blades mediation mechanism, by adjusting the rod move up, pull the drive plate sets move together, arm pull knob, thus changing the mounting angle of the impeller.