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Pump head curve shape of limited value and scope of application

Pump head curve shape of limited value and scope of application

(Summary description)

Pump head curve shape of limited value and scope of application

Pump power generated at a certain speed lift has a limited value , lift with the flow and change ; stable, continuous delivery , flow and pressure pulsation ; generally no self-absorption capacity , the need to be filled with a liquid pump or pipeline pumping into the vacuum before starting work ; apply wide range of performance ; suitable for conveying small cleaning fluid viscosity , specially designed pump can deliver mud, sewage and other solids or water transportation . Powered pump is mainly used for water supply, drainage , irrigation, liquid transfer process , power accumulator , hydraulic and marine jet propulsion .

Jet pump is to rely on high-speed jet of working fluid , the need to transport the fluid sucked into the pump and carried by the momentum exchange between the two fluids mixing to transfer energy ; Water hammer is the use of the pump flow of water is generated when sudden braking energy , a part of the pressure rise to a certain height ; electromagnetic pump is powered liquid metal to the electromagnetic force, the generated transport flow is achieved ; gas lift pump through the catheter to the air or other fluid in the compressed gas at the bottom , so as to form lighter than liquid -liquid mixed fluid , and then the pressure of the liquid through the tube mixed fluid pressure will rise up .

The main performance parameters of the pump

Pump performance parameters are flow and head , in addition to shaft power , speed , and required cavitation margin. Traffic is the unit of time through the pump outlet output volume of liquid , the general volume flow ; lift is the unit weight of transmission fluid from the pump inlet to the outlet of the energy increment for the displacement pump , the energy increase mainly reflected an increase in the pressure on energy Therefore, instead of head pressure increment usually expressed .

Pump efficiency is not an independent performance parameters, which can be another performance parameters such as flow rate, head and shaft power according to a formula obtained . Various performance parameters of the pump there is a certain interdependence between the changes in the relationship , you can test the pump were measured and calculated parameter values ??, and draw a curve that these curves is called the pump characteristic curve . Each pump has a specific characteristic curve provided by the pump manufacturer . Usually given in the factory characteristic curve also indicates recommended performance segment , called the pump operating range.

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