Numerical study on matching structures improvement of vertical self-priming pump

Abstract

In the vertical packingless self-priming pump which was designed by using traditional method, special water passage and cylindrical air-water separation chamber were used to ensure the self-priming performance. In order to identify the influence produced by different structures on the vertical self-priming pump and improve the hydraulic performance of the vertical packingless self-priming pump, a three-dimentional model of the vertical self-priming pump including inlet passage, impeller, volute, cylindrical air-water separation chamber and outlet pipe was established. The influences of different key parameters of hydraulic model and the matching structure on hydraulic performance of the self-priming pump such as the distance, height and angle between the outlet of the volute and inlet of the outlet pipe, were analyzed by using numerical method. Self-priming pump models with different matching structures of volute and outlet pipe were simulated and analyzed in detail. Based on the analysis, the advices of the matching structure design and key parameters selection are presented in this paper. The result of numerical analysis is used in optimizing design of the vertical packingless self-priming pump. Model pump performance test was carried out on an open type pump experiment system which consists of water reservoir, inlet pipe, self-priming pump, outlet pipe, flow rate and pressure transducers. The numerical and experimental results were matched very well. The performance of optimized products was verified by industrial applications.