Type D the meaning of multistage centrifugal pump performance curve

D type involved in the introduction of multi-stage centrifugal pump performance parameters of the map. Many novice in practice often don't understand the meaning of the graph. Today, we have to analyze the value of the performance curve, teach you how to read the d-type multi-stage centrifugal pump performance curve!

D multi-stage centrifugal pump performance parameters such as flow rate Q, lift H, rotating speed of shaft power N, N, a certain relationship between efficiency of eta. Changes the value of the relationship between them by curve, the curve is referred to as the water pump performance curve. Multistage centrifugal pump performance curve is under fixed rotational speed, the centrifugal pump of the basic performance parameters ( Flow, pressure head, power and efficiency) The relationship between the curve. Performance curve is measured under fixed rotational speed, only applies to the speed, it indicate the value of the speed characteristic curve. performance parameters change between relations and mutual conditionality: first, under the prerequisite of the water pump of the forehead top speed. Type D multi-stage centrifugal water pump performance curve mainly have three: flow - Lift curve, traffic - Power curve, traffic - Efficiency curve. 1, flow - Lift the performance curve, it is the basic of centrifugal pump performance curve. Specific speed is less than 80 centrifugal pump has the characteristics of the rise and fall, Under both raised among, both sides bend) 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, flow - Shaft power is the power curve with the increase of traffic and, 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 on the mechanical loss. Is full of water in the pump at this time, if the long run, will lead to pump temperature rising, the water pump shell, bearing will be fever, serious when can make the water pump body thermal deformation, we called 'stuffy head', the head of the maximum, when gradually open the discharge valve, the flow rate will gradually increase, shaft power also slowly increase. 3, flow - Xiangshan head shape efficiency curve of its curve, when the flow rate is zero, efficiency is also equal to zero, with the increase of flow rate, efficiency is also increased gradually, but efficiency has decreased after increased to a certain value, there is a high efficiency, near the highest efficiency point, efficiency is high, the region known as the high efficiency area.
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