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

① Vane pumps rely on the rotating impeller to continuously transfer energy to the liquid, increasing its kinetic energy (mainly) and pressure energy. Then, the kinetic energy is converted into pressure energy through the extrusion chamber. They can be divided into centrifugal pumps, axial flow pumps, partial flow pumps, and vortex pumps.

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

③ Other types of pumps transmit energy in other ways. If the jet pump relies on high-speed injection of working 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 rise to a specific height and transfer energy; An electromagnetic pump is a device that enables the flow of liquid metal under electromagnetic force to complete transportation. In addition, pumps can also be classified according to the nature, driving method, structure, and purpose of transporting liquids.

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