The classification of water pump can not comprehensively classify its working principle and purpose, which will be very messy. Use is use, principle is principle, pumps with different principles can be used for the same purpose. The same pump can also be used in different places and for different purposes. For example, the mixed flow pump is a diagonal flow pump, which adopts a mixed flow impeller, that is, the direction of liquid flowing out of the impeller is inclined to the axis. The liquid outflow direction of axial flow pump is parallel to the axis. Its classification includes sewage pump, chemical pump, magnetic pump, oil pump, fire pump, vacuum pump, diaphragm pump, screw pump, pipeline pump, submerged pump, reciprocating pump, colloid mill, water supply and drainage equipment, hydraulic ejector, control cabinet, etc. the following are listed for reference:
1. First of all, they are classified according to the working principle:
1) Vane pump
Vane pump can be divided into: centrifugal pump, mixed flow pump, axial flow pump and vortex pump.
Centrifugal pump can be divided into single-stage pump and multi-stage pump.
Single stage pump can be divided into: single suction pump, double suction pump, self-priming pump, non self-priming pump, etc.
Multistage pumps can be divided into segmental type and volute type.
Mixed flow pump can be divided into volute type and guide vane type.
Axial flow pumps 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 and submersible pump.
2) Positive displacement pump
Positive displacement pump can be divided into reciprocating pump and rotor pump.
The volume of the pump is alternately increased or reduced in order to increase the volume of the pump and reduce the volume of the pump. The positive displacement pump with reciprocating activities of working elements is called reciprocating pump, and the one with rotary activities is called rotary pump. The suction and discharge processes of the former are carried out alternately in the same pump cylinder and controlled by the suction valve and discharge valve; The latter forces the liquid to be transferred from the suction side to the discharge side through the rotation of working elements such as gears, screws, leaf rotors or sliding blades.
The flow of positive displacement pump at a certain speed or reciprocating times is certain, which hardly changes with the pressure; The flow and pressure of reciprocating pump have large pulsation, so corresponding methods to reduce pulsation shall be adopted; Rotary pump generally has no pulsation or only small pulsation, diaphragm pump; With self-priming ability, the centrifugal pump can pump out the air in the pipeline and suck in the liquid after the pump is started; When starting the pump, the discharge pipeline valve must be completely opened; Reciprocating pump is applicable to high pressure and small flow; Rotary pump is used for small and medium flow and high pressure; Reciprocating pump is suitable for conveying clean liquid or gas-liquid mixture, chemical pump. In general, the efficiency of positive displacement pump is higher than that of power pump.
3) . jet pump
It is the high-speed jet produced by the working fluid that ejects the fluid, and then increases the energy of the ejected fluid through momentum exchange.
Power pump relies on the force of the rapidly rotating impeller on the liquid to transfer mechanical energy to the liquid to increase its kinetic energy and pressure energy, and then convert most of the kinetic energy into pressure energy through the pump cylinder to realize transmission. Power pump is also known as impeller pump or vane pump.
Centrifugal pump is the most common power pump.
There is a limit value for the head of a power pump at a certain speed. For a magnetic pump, the head changes with the flow; Stable operation, self-priming pump, continuous delivery, no pulsation of flow and pressure; Generally, there is no self-priming ability. It is necessary to fill the pump with liquid or vacuum the pipeline before starting to work; Wide range of practical performance; It is suitable to transport clean liquid with low viscosity. The specially designed pump can transport mud, sewage, etc. or water transport solids. Power pumps are mainly used for water supply, drainage, irrigation, process liquid transportation, power station energy storage, hydraulic transmission and ship jet propulsion.
4) Other classifications of pumps
In addition to the classification according to the working principle, the pump can also be classified and named in other ways. For example, according to the driving method, it can be divided into electric pump, steam turbine pump, diesel pump and water turbine pump; According to the structure, it can be divided into single-stage pump and multi-stage pump; It can be divided into boiler feed pump and metering pump according to their use; According to the nature of the transported liquid, it can be divided into water pump, oil pump and mud pump