Positive displacement type: The working volume is increased and decreased periodically by the movement of the working parts to absorb and discharge the liquid, and the pressure of the liquid is directly increased by the extrusion of the working parts. According to the different movement modes of the moving parts, it can be divided into reciprocating pumps and rotary pumps; according to the different structures of the moving parts, it can be divided into piston pumps, plunger pumps, gear pumps, screw pumps, vane pumps and water ring pumps.
Impeller type: The impeller drives the liquid to rotate at high speed and transfers mechanical energy to the transported liquid. According to the different characteristics of the impeller and flow channel structure of the pump, it can be divided into centrifugal pumps, axial flow pumps, mixed flow pumps, vortex pumps, etc.
Jet type: The high-speed jet generated by the working fluid ejects the fluid, and then the energy of the ejected fluid is increased through momentum exchange.
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