There are many types of pumps and different structures. The pumps can be divided into three categories according to their working principle.
1. vane pump vane pump on pump impeller rotating speed of engine mechanical energy conversion to pumping water. There are centrifugal pumps, axial pumps and mixed flow pumps for this kind of pumps.
2. centrifugal pumps are divided into single stage single suction centrifugal pumps, single stage double suction centrifugal pumps, multi-stage centrifugal pumps and self-priming centrifugal pumps according to the basic structure and type characteristics.
3. other types of pumps, other types of pumps are pumps except vane pumps and volumetric pumps. In the irrigation and drainage pumping station in jet pumps, water hammer pump, gas lift pump (also called air pumping machine, screw pump etc.). Among them, in addition to the screw pump is to use spiral propulsion principle to improve the potential energy of the liquid, other types of pumps are the use of working fluid transfer energy to transport liquid. The vane pump consists of a wide range from low lift to high lift, from large flow to small flow. The water pump is the most widely used in the drainage and irrigation of farmland