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First, the type of pump principle:
1, the definition of the pump: usually to enhance the liquid, liquid delivery or to increase the pressure on the liquid that is, the mechanical energy of the prime mover into liquid energy to achieve the purpose of pumping liquid machine collectively referred to as the pump.
2, the working principle of the pump:
(1) positive displacement pump - the use of the working chamber volume change of periodic delivery of liquid.
(2) vane pump - the use of the blade and the liquid interaction to transport liquid 3, the specific use of the pump: pump for different purposes, different liquid media delivery, different flow, different head range, the pump type of course Not the same, the material is different, sum up, can be roughly divided into:
(1) City Water Supply (2) Sewerage (3) Civil Engineering and Building Systems Agricultural Water Conservancy Systems Power Station Systems Chemical Systems (7) Petroleum Industry Systems Mining and Metallurgical Systems (9) Light Industrial Systems (10) Ship system
Second, the principle of selection of the pump:
Design Institute in the design of equipment, equipment, to determine the purpose and performance of the pump and select the type of pump. First of all, this choice from the choice of pump type and form of the beginning, then what principle to choose the pump? What is the basis?
(1) Make the form and performance of the selected pump meet the requirements of process parameters such as flow rate, lift, pressure, temperature, NPSH, suction and so on.
(2) The characteristics of the medium must be satisfied. On the transport of flammable, toxic or precious medium pump, shaft seal reliable or require the use of leak-free pumps, such as magnetic drive pumps, diaphragm pumps, shielded pumps. For conveying corrosive media pumps, the need for over-current components using corrosion-resistant materials, such as AFB stainless steel corrosion-resistant pump, CQF engineering plastic magnetic drive pump. For pumps containing solid particulate media, wear-resistant materials are required for overcurrent components, and if necessary, the shaft seal is flushed with a cleaning fluid.
(3) Mechanical reliability, low noise, small vibration.
(4) Economically, the total cost of equipment fee, running cost, maintenance fee and management fee should be the lowest.
(5) Centrifugal pump with high speed, small size, light weight, high efficiency, large flow, simple structure, no pulse of liquid, stable performance, easy operation and maintenance features. Therefore, in addition to the following circumstances should try to use centrifugal pump: a measurement requirements, the selection of metering pumps; lift high, flow is small and not suitable for small flow high lift centrifugal pump optional, you can choose to repeat the pump; such as cavitation Low requirements can also be used when the vortex pump; head is low, the flow is large, the choice of axial flow pump and mixed flow pump; media viscosity (greater than 650 ~ 1000mm2 / s), consider the use of rotor pump or repeat pump (Gear pump, screw pump); medium gas content of 75%, the flow is smaller and the viscosity is less than 37.4mm2 / s, the choice of vortex pump; start frequent or inconvenient pumping occasions, should use self-priming pump Self-priming centrifugal pumps, self-priming vortex pumps, pneumatic (electric) diaphragm pump.