Design And Research Of Diaphragm Pump Diaphragm

Due to the long head,small flow,and the ability to transport abrasive liquids containing abrasive particles and high viscosity,corrosive and other dangerous liquids,diaphragm pumps have become important power equipment in the global industry.As the boiler dosing metering pump for the steam turbine unit,the diaphragm pump,its operating performance directly affects the safe operation of the unit equipment.For conventional diaphragm pumps,the delivery pressure is generally about 10 MPa,which is used for conventional boiler dosing,while large power stations,especially supercritical unit power plants,have a dosing pressure of 24 MPa,which can reach 25 MPa at the highest.During the actual use of the high-pressure diaphragm metering pump,the working parts of its diaphragms are extremely prone to deformation and tearing problems,which will cause leakage accidents and affect the normal operation of the unit.In order to adapt to the reliability and safety of the diaphragm pump of the supporting equipment of the supercritical steam turbine unit,a mathematical model is established for the flat diaphragm of the traditional diaphragm pump,and the simulation is performed using ANSYS software.The analysis of the simulation results shows that the fixed place of the flat diaphragm The inner edge and the outer edge of the central area are the two dangerous parts with large stress and deformation of the diaphragm.Aiming at the uneven stress distribution and stress concentration of the diaphragm,a new(heteromorphic)diaphragm was designed,and the thickness and size parameters of the designed new diaphragm were optimized.According to the results of the ANSYS simulation analysis of the new diaphragm,the final results were obtained.The values of the structural parameter variables were obtained,the structural size of the diaphragm was optimized,and the design size of the new diaphragm was finally determined.The design structure of the new diaphragm improves the stress concentration of the diaphragm.Considering the factors that affect the fatigue life of the diaphragm and the SN curve of the chloroprene rubber material,the finite element analysis results for the diaphragm in the workbench are imported into ANSYS.Fatigue analysis was performed on the optimized new diaphragm and traditional diaphragm.The final result showed that the fatigue life of the new diaphragm was much longer than that of the traditional diaphragm,which verified the reliability of the new diaphragm structure.