Research On Structure Optimization And Preparation Process Of A Volute Centrifugal

As a common fluid mechanical equipment,centrifugal pump is widely used in industry,agriculture and other fields of production and life.Stamping and welding centrifugal pumps,manufactured by stamping and welding,become substitute products of traditional casting centrifugal pump because which has excellent hydraulic performance,time-saving and material-saving in manufacturing process,easy to realize mechanical automation production and other advantages.However,there is still a clear gap between china and foreign countries in hydraulic design and manufacturing processes of stamping and welding centrifugal pumps.Therefore,this paper systematically studied and analyzed the stamping and welding centrifugal pump from the aspects of hydraulic design,structure optimization and stamping manufacturing.Casting pipeline circulating centrifugal pump of TD100-24Y was taken as the research object,and hydraulic model of centrifugal pump was established.The finite element software was used to simulate the internal flow field in centrifugal pumps,and the performance curve was obtained.The hydraulic design of stamping and welding centrifugal pump was completed on this basis.The results of the research were as follows:The hydraulic model of the original casting centrifugal pump was simulated.The simulation results were in good agreement with the actual hydraulic performance results,and the deviation of head and efficiency was below 5%.The hydraulic design of stamping and welding centrifugal pump was carried out and the hydraulic model was established.The efficiency of stamping and welding centrifugal pump was improved by optimizing the impeller structure.The influence of impeller outlet angle,outlet diameter,outlet width and blade number on head and efficiency of centrifugal pump was studied.The results showed that:the efficiency of centrifugal pump can be improved by properly increasing the outlet angle,width and reducing the outlet diameter;The optimum design parameters of the impeller were as follows:the outlet angle was 27°,the outlet diameter was 287mm,outlet width was 13mm,and the blades number was 5;Under the design condition of 90m³/h,the head of the optimized centrifugal pump was 23.9m and the efficiency was 70.9%,and the efficiency was 3.2%higher than that before optimization.In order to study the strength and vibration characteristics of the the stamping and welding pump impeller running under water pressure,the strength analysis and modal analysis of the impeller structure were carried out.The research showed that:the maximum equivalent stress was 5.85MPa and the maximum deformation was 3.67×10^-3mm without water pressure.the maximum equivalent stress was 152.64MPa and the maximum deformation was 0.14mm under water pressure.The deformation of impeller is greatly affected by water pressure,and maximum equivalent stress was less than allowable stress of 205MPa,so there was no plastic deformation on the impeller.The natural frequency of the impeller was much greater than the rotational frequency of 24Hz,so there was no resonate on the impeller.The stamping die and stamping process of stamping and welding centrifugal pump blade had been designed and produced.Stamping process of blade was simulated and the maximum thinning rate of the simulated blade was 0.016,which indicated that the sheet was formed well.The hydraulic test of the stamping and welding pump was carried out.and the test results showed that:The deviation between the numerical simulation efficiency and the actual experimental efficiency was below 2%.The combination of numerical simulation and experimental verification shorten the design cycle,and reduced the cost of centrifugal pump,which in order to speed up the research process of centrifugal pump.