立式自吸泵前口环几何参数对其自吸性能的影响OA北大核心CSTPCD

In order to explore the influence of the geometric parameters of the front wear-ring of a verti-cal self-priming pump on its self-priming performance,the 350WFB-1200-50 externally mixed sealless vertical self-priming pump was taken as the research object.With other parameters unchanged,a total of 20 solutions were designed by changing the numerical values of the front wear-ring clearance δ and the front wear-ring length l.Using a research method that combines numerical calculation and ex-perimental verification,the hydraulic characteristic curve of each design scheme and the pressure difference between the inlet and outlet of the front wear-ring were obtained through steady numerical calculation,and the gas volume distribution cloud map of the middle section at different times of each design scheme was obtained through unsteady numerical calculations.The change diagram of the gas content rate at the outlet of the self-priming pump of each design scheme and the self-priming comple-tion time curve of each design scheme were used to study the influence of the geometric parameters of the front wear-ring on its self-priming performance.The study finds that the front wear-ring clearance δ and the front wear-ring length l have an effect on the self-priming performance of the self-priming pump,appropriately reducing the front wear-ring clearance δand increasing the front wear-ring length l can improve the self-priming performance of the self-priming pump,and when the front wear-ring clearance δis too large,the effect of the front wear-ring clearance δon the self-priming performance of the self-priming pump is larger than the effect of the front wear-ring length l on the self-priming per-formance of the self-priming pump.