Performance curve spectrum of centrifugal pump
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Last Update: 2014-07-17
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Source: Internet
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Author: User
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How to see the performance curve spectrum of centrifugal pump: each point on the performance curve of centrifugal pump corresponds to a working condition, and it is Zui ideal for centrifugal pump to work at Zui rate point, but this requirement is not realistic Generally, a working range is specified, as shown in section ab of curve 1 in Figure 2-4, within which the efficiency of pump operation decreases little By changing the speed or cutting the impeller, it is also called to expand the operating mechanism range of the pump Curve 2 is to change the speed or the characteristic curve before and after cutting the impeller Curve 3 and curve 4 are similar parabola changing the speed or cutting the outer diameter (parabola) Block ABCD is called pump to expand the working range of R the pump works at any point in this model, and the efficiency drop Zui will not be more than 5% - 8% The working range of many pumps is drawn in a coordinate diagram, which is called type spectrum In order to coordinate the graph, the working range of high lift and large flow is not too large (because the working range of high lift and large flow is relatively larger), usually expressed by logarithmic coordinates Generally, each series of pumps has a type spectrum Figure 2-4 pump working range series type spectrum is for user selection, on the other hand, it can be used to guide the development of new products Each series of Zui is easy to use several hydraulic models of specific speed The diameter of the pump changes according to a certain flow interval ratio, and the head of the same diameter pump also changes according to a certain interval ratio Fig 2-5 is a series type spectrum of a centrifugal pump.
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