According to the working principle
1. Positive displacement pump
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 squeezing of the working parts.
According to the different movement modes of the moving parts, it is divided into two categories: reciprocating pumps and rotary pumps.
According to the different structures of the moving parts, there are: piston pumps and plunger pumps, gear pumps, screw pumps, vane pumps and water ring pumps.
2. Impeller pump
The impeller pump transfers mechanical energy to the transported liquid by driving the impeller to rotate the liquid at high speed.
According to the different characteristics of the impeller and flow channel structure of the pump, the impeller type can be divided into:
1) Centrifugal pump
2) Axial pump
3) Mixed-flow pump
4) Peripheral pump
3. Jet pump
It is to use the high-speed jet generated by the working fluid to eject the fluid, and then increase the energy of the ejected fluid through momentum exchange.
Pumps can also be divided into the following types according to the position of the pump shaft:
1) Vertical pump
2) Horizontal pump
According to the number of suction ports:
1) Single suction pump
2) Double suction pump
According to the prime mover that drives the pump:
1) Motor pump
2) Steam turbine pump
3) Diesel pump
4) Diaphragm pump
