1) The operating principle can be divided into blade type, volumetric type, and other methods.

① Vane type pumps rely on the power effect of rotating impellers on the liquid to continuously transmit energy to the liquid, increasing the kinetic energy (mainly) and pressure energy of the liquid. Subsequently, the kinetic energy is converted into pressure energy through the pressure chamber, and can be further divided into centrifugal pumps, axial pumps, partial flow pumps, and vortex pumps.

② Positive displacement pumps rely on the periodic changes in the volume of the sealed working space that contains the liquid to periodically transmit energy to the liquid, increasing the pressure of the liquid to forcibly discharge it. They can be divided into reciprocating pumps and reverse pumps according to the movement mode of the working components.

③ Other types of pumps transmit energy in other ways. If a jet pump relies on high-speed jetting of the operating fluid to suck the fluid to be transported into the pump and mix it, momentum exchange is carried out to transfer energy; The water hammer pump utilizes a portion of the water flowing during braking to be lifted to a specific height to transfer energy; An electromagnetic pump is a device that enables the flow of energized liquid metal under the effect of electromagnetic force to complete transportation. In addition, pumps can also be classified according to the nature of the liquid being transported, driving method, structure, use, etc.