Centrifugal pump characteristic curve, the characteristic curve of centrifugal pump, centrifugal pump characteristic curve

When the rotating speed n is a constant, lists the head ( H） , shaft power ( N) , efficiency, η） And allow the vacuum suction height ( HS） Along with the flow (such as Q） The function relation of change, i. e. , H = f ( Q） ; N = F ( Q） ; Hs =Ψ( Q） ; η = φ（ Q） , we put the relationship between these equations with curve, the curve is called characteristic curve of centrifugal water pump. Effective pressure head H centrifugal pump, shaft power efficiency of N and eta are related to the fluids flow rate Q, is the main performance parameters of the centrifugal pump.

centrifugal pump characteristic curve is under a certain rotational speed measurement is made by the design intention and actual test, the factory before the determination by the pump manufacturer H - Q, eta - Q, N - Q three characteristics, namely for a certain type of centrifugal pump characteristic curve under a certain speed, users listed in the product sample for reference. Centrifugal pump characteristic curve usually use di Carl first coordinate system. The abscissa said the flow of the pump, pump lift ordinate said, specific centrifugal pump capacity and head curve is a curved line down, said its flow increase with the decrease of the pump head.

centrifugal pump characteristic curve reflect the variety regulation of the basic properties of the pump, can be used as the basis of pump and pump. Different pump characteristic curve is different, the water pump characteristic curve provided by the equipment manufacturer. Strictly speaking, each pump has a specific characteristic curve. Flow on the water pump characteristic curve, corresponding to any point can be found a set of corresponding head, shaft power and efficiency value, usually call this a set of corresponding parameters, the corresponding to the highest efficiency point of a set of condition known as the best conditions. Various types of centrifugal pump characteristic curve although different, but all have a common trend.

      （ 1) H - Q curve ( Flow - Lift curve) Said the relationship between the pressure head and flow pump. Head of centrifugal pump is usually along with the increase of flow rate and lower. Specific speed is less than 80 centrifugal pump has the characteristics of the rise and fall, On both sides of the middle convex, under bending) That hump performance curve. Specific speed centrifugal pump has between 80 ~ 150 flat performance curve. Than revolutions in the more than 150 centrifugal pump has a steep fall in the performance curve. Generally said, when the traffic hours, head high, with the increase of traffic head will gradually decline.

      （ 2) N - Q curve ( Flow - The power curve) Said of the pump shaft power relationship with the flow. Centrifugal pump shaft power with the increase of flow rate and the rising, flow is zero minimum shaft power. The centrifugal pump starts, so should close the pump outlet valve, reduce starting current, motor protection. Shaft power is increases with flow rate, when the flow rate Q = 0, the corresponding shaft power is not equal to zero, and to a certain value ( About 60% of the normal operation) 。 The main power consumption in the mechanical loss. At this time because the pump is full of water, if the operation of the centrifugal pump has been a long time, temperature rising, will lead to pump pump shell, bearing will be fever, severe cases may make the pump body thermal deformation, reach maximum lift at this time, this time will gradually open the discharge valve, flow will also gradually increase, shaft power also slowly increase.

      （ 3) Eta - Q curve ( Flow - Efficiency curve) Said of the pump efficiency and flow rate. Flow - Efficiency curve xiangshan head shape, when the flow rate is zero, efficiency is also equal to zero, with the increase of flow rate, efficiency is also increased gradually, but increased to a certain value after efficiency is decreased, at this time there is a high efficiency, in the most efficient near efficiency, efficiency is high, the region known as the high efficiency area.

characteristic curve, when Q = 0, eta = 0; With the increase of flow rate, pump efficiency rise, and reached a maximum value. Traffic increased again, the efficiency will decline. Shows a maximum efficiency under the centrifugal pump in a certain speed point, called the design point. with high efficiency work under the corresponding flow rate and pressure head of the economy, so the corresponding with the highest efficiency Q, H, N value is called the best operating conditions. Centrifugal pump nameplate on the performance parameters of the pump is refers to the high efficiency of condition parameters at run time. According to the requirement of the transport conditions, the centrifugal pump is often impossible to just running at optimum condition, therefore normally only prescribes a scope of work, known as the high efficiency of the pump area, usually for about 92% of the highest efficiency, as shown in figure # twists and turns in the demonstration, when choosing a centrifugal pump, should as far as possible make the pump within the scope of this work.

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