Pump classification can not be integrated into the working principle and purpose of classification, it will be chaotic. Purpose is to use, the principle is the principle, different principles of the pump can be used in the same purpose. The same pump can also be used for different occasions, can be used for different purposes. For example: The mixed flow pump is a diagonal flow pump, which uses a mixed flow impeller, that is, the liquid flows out of the impeller in a direction inclined to the axis. Axial flow pump its liquid outflow direction parallel to the axis. The main categories are chemical pump magnetic pump centrifugal pump sewage pump self-priming pump oil pump diaphragm pump screw pump gear pump shield pump submersible pump gear pump pipe pump corrosion-resistant pump acid pump multi-stage pump stainless steel pump liquid pump, etc. Following is a list of several As a reference: First of all, the main categories of pumps are classified according to the working principle: 1, vane pump leaf pump can be divided into: centrifugal pump, mixed flow pump, axial flow pump, vortex pump. Centrifugal pump can be divided into single-stage pump, multi-stage pump. Single-stage pump can be divided into: single suction pump, double suction pump, self-priming pump, non-self-priming pump and so on. Multistage pumps can be divided into: segmental, volute type. Mixed flow pump can be divided into the shell and guide vane. Axial flow pump can be divided into fixed blades and adjustable blades. Vortex pump can also be divided into single suction pump, double suction pump, self-priming pump, non-self-priming pump. 2, Positive displacement pump Positive displacement pump can be divided into reciprocating pump, rotor pump. Positive displacement pump is to rely on working elements in the pump cylinder for reciprocating or rotary motion, so that work volume alternately increase and decrease, in order to achieve liquid inhalation and discharge. The reciprocating motion of the working elements of the positive displacement pump called the reciprocating pump, known as rotary motion rotary pump. The former suction and discharge process alternately in the same pump cylinder, and by the suction valve and the discharge valve to control; the latter is through the gear, screw, leaf rotor or slide and other working elements of the rotation, forcing the liquid from inhalation Side to the discharge side. Volumetric pump at a certain speed or reciprocating frequency of the flow is certain, almost no change with the pressure; reciprocating pump flow and pressure pulsation, the need to take appropriate measures to reduce pulsation; rotary pump generally no pulsation or only a small Pulsation; with self-suction capacity, the pump can be started immediately after the suction of liquid in the suction pipe; start the pump must be completely open the discharge pipe valve; reciprocating pump for high pressure and low flow; rotary pump for small and medium-sized flow And higher pressure; reciprocating pump suitable for conveying clean liquid or gas-liquid mixture. In general, positive displacement pumps are more efficient than power pumps. 3, jet pump is generated by the working fluid jet jet fluid at high speed, and then through the exchange of momentum and the fluid is injected to increase the energy. Powered pumps rely on the impellers' ability to rapidly rotate the impeller to transfer mechanical energy to the fluid to increase its kinetic energy and pressure, and then through the pump cylinder to convert most of the kinetic energy to pressure energy for delivery. Power pump, also known as impeller pump or vane pump. Centrifugal pumps are the most common type of power pump. Power pump head at a certain speed has a limited value, head changes with the flow; work stable, continuous delivery, flow and pressure pulsation; generally no self-absorption capacity, the need to fill the pump first liquid or pipe pumping To work in vacuum; suitable for a wide range of performance; suitable for conveying a very small viscosity of the cleaning liquid, specially designed pump can transport mud, sewage and water transport solids. Power pumps are mainly used for water supply, drainage, irrigation, process liquid delivery, power storage, hydraulic transmission and jet propulsion. 4, other pump classification Pump in addition to the principle of classification, but also by other methods of classification and naming. For example, according to the driving method can be divided into electric pump, steam turbine pump, diesel pump and water pump; according to the structure can be divided into single-stage pump and multi-stage pump; According to the use can be divided into boiler feed pump and metering pump; The nature of the liquid can be divided into pumps, pumps and mud pumps. The pump can also be divided according to the pump shaft position: 1) vertical pump 2) The horizontal pump is divided according to the number of suction ports: 1) single suction pump 2) double suction pump Press the driving pump The prime mover points: 1) Electric pump 2) Turbine pump 3) Diesel pump 4) Turbine pump Other types of pumps refer to a class of pumps that deliver energy in other ways. For example, a jet pump relies on a working fluid that is jetted out at a high velocity and draws the fluid to be delivered to the pump and transfers the momentum by exchanging the two fluids for energy transfer; the water hammer pump is generated by sudden braking of flowing water Energy, so that part of the water pressure rose to a certain height; electromagnetic pump is to make the power of the liquid metal under the action of electromagnetic force, to produce flow and delivery; gas lift pump through the catheter to the compressed air or other compressed gas to the liquid The bottom, so that the formation of a lighter liquid gas-liquid mixture of fluid, and then by the pressure of the liquid outside the liquid mixture pressure up.