The centrifugal pump is mainly composed of an impeller, a pump casing, a shaft, a shaft sealing device, a sealing device, etc. The specific introduction is as follows:(1) Impeller: The impeller is the main flow component of the centrifugal pump. Its role is to transfer the mechanical energy from the primary engine to the liquid to increase the static pressure energy and the kinetic energy of the liquid. There are several types of impellers: open, semi-closed and closed. The casting materials of the impeller are generally made of cast iron, cast steel, alloyed steel or other materials.(2) Shaft: The centrifugal pump shaft is used to transmit torque to drive the impeller to rotate. On the shaft, the impeller, the bearing, the sealing device and the pump coupling are parts.(3) Pump housing: the impeller is closed in a fixed section