Slurry pumps are a large category in pumps, characterized by relying on the high-speed rotation of the impeller to complete its energy conversion. Due to the different shapes of the blades in the impeller, the mass force applied to the water flow through the impeller during rotation is different, and the direction in which the water flows out of the impeller is also different. According to the flow direction of the impeller outlet water, vane pumps can be divided into three types: radial flow, axial flow, and oblique flow. The radial flow impeller is called a centrifugal pump, and the liquid particles flowing in the impeller are mainly subjected to centrifugal force. The axial flow impeller is called an axial flow pump, and the main effect of liquid particles flowing in the impeller is the axial lift force. The impeller of oblique flow is called a mixed flow pump, which is a transitional form of the above two impellers. When liquid particles flow in the impeller of this pump, they are affected by both centrifugal force and axial lift force.
In water supply and drainage projects in towns and industrial enterprises, vane pumps are widely used, with centrifugal pumps being the most common. This chapter will focus on centrifugal pumps for detailed introduction and explanation.