Axial flow pump in use, and sometimes pump performance does not meet production needs, we must adjust the pump performance, so that it can meet the actual needs. For example, the winter dry season, summer flood season, into the pool or the pool water level has changed, that is, the actual terrain Pumped water height has changed, the original head and flow has been determined to not meet, lower efficiency, the pump is not operating. Therefore, to meet the new requirements of the water pump, but also to work under higher efficiency, which requires the performance of the pump to adjust. Axial flow pump performance adjustment, usually using two methods: 1, variable speed regulation We already know that the axial flow pump is working at a certain speed, and access to the appropriate flow, lift, power and efficiency. When the speed changes, its performance parameters also change accordingly, so as to achieve the purpose of regulation. If the axial flow pump is powered by a diesel engine or a gasoline engine, the throttle speed can be changed by changing the throttle size. If the axial flow pump is connected with the power machine through a V-belt or flat belt indirect transmission device, the diameter of the transmission pulley can be changed to change speed Drive wheel or driven wheel can, the purpose is to change the transmission ratio. Variable speed pump performance, more economical, the scope of application is broader, all agricultural pumps can be used. 2, variable angle adjustment From the structure point of view, axial pump impeller with a huge hub, easy to install adjustable angle blades. When the blade installation angle is changed, the blade lift on the water also changed, thus changing the pump performance, which is the axial pump variable angle adjustment. As the blade mounting angle increases and decreases, the axial flow pump flow, lift, power that is changed, however, the highest point of efficiency but no change, it is very conducive to the axial flow pump performance regulation. According to the structure of the impeller, the blade installation angle of the device, the leaves are divided into three types: (1) the fixed blade leaves and wheel cast as a whole, blade installation angle has been fixed in the design and manufacture, can not be adjusted during use . This type of impeller used for small pumps. (2) Semi-adjusting vanes Loosen the fixing nut and set screw of each vane on the impeller hub. Adjust the vane mounting angle according to the requirements and fasten it. General blade mounting angle from the negative 100-180. In this range, according to the requirements to adjust. (3) Leaf-blade leaves with special design of the angle adjustment mechanism to adjust, you do not have to disassemble the impeller, you can directly manipulate the mechanism to change the blade mounting angle, the adjustment range from 0-260. Blade angle adjustment mechanism has two kinds of mechanical adjustment and hydraulic adjustment. This impeller is mostly used for large-scale axial flow pump.