Centrifugal pump performance reasons 1, the physical properties of liquid on the characteristic curve Produced by the manufacturer's characteristic curve is measured with water as the working medium, when the transfer of other liquids, the liquid density and viscosity to be considered. (1) Viscosity When the viscosity of the liquid transported is greater than the viscosity of the water under the experimental conditions, the energy loss in the pump body increases. The flow rate and pressure head of the centrifugal pump decrease, the efficiency decreases, and the shaft power increases. (2) Density Centrifugal pump volume flow and pressure head has nothing to do with the liquid density, the power increases with increasing density. 2, centrifugal pump speed on the characteristic curve When the liquid viscosity is not, the efficiency of the pump constant, the pump flow, pressure head, shaft power and speed can be approximated by the proportion of law, that is: Q1, H1, N1 centrifugal pump speed n1 when the flow, head and power. Q2, H2, N2 centrifugal pump speed n2 when the flow, lift and power. The above set of equations is called the law of proportion. When the speed changes less than 20%, the efficiency can be considered unchanged, with the workers to calculate the error is not. If you select several points on the characteristic curve of speed n1, calculate the corresponding data of the rotational speed n2 by the law of proportionality, and plot the result on the coordinate paper, you can get the characteristic curve when the rotational speed is n2. 3, the impeller diameter on the characteristic curve When the centrifugal pump speed is certain, its head, flow and impeller diameter. The following is the law of cutting. Where: Q1, H1, N1 centrifugal pump speed at D1 flow, head and power. Q2, H2, N2 centrifugal pump speed D2 flow, lift and power.
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