Positive displacement pump: the working volume is periodically increased and decreased by the movement of working parts to suck and discharge liquid, and the pressure of liquid can be directly increased by the extrusion of working parts. According to the different motion modes of moving parts, it can be divided into two categories: reciprocating pump and rotor pump. According to the structure of moving parts, there are piston pumps and plunger pumps, gear pumps, screw pumps, vane pumps and water ring pumps.
Impeller pump: it is composed of water inlet pipe, guide shell, check valve, pump shaft and impeller. The impeller pump drives the liquid to rotate at high speed and transfers mechanical energy to the conveyed liquid.
Diaphragm pump: Diaphragm pump, also known as control pump, is the main type of actuator, which changes the fluid flow by receiving the control signal output by modulation unit and relying on power operation. Diaphragm pumps are generally composed of actuators and valves. With compressed air as power source, all kinds of corrosive liquids, liquid with particles, high viscosity, volatile, flammable and highly toxic liquids can be pumped out and absorbed.