Study On Resistance Characteristics And Structure Optimization Of An Induced Flow Diaphragm Pump

The reciprocating drainage diaphragm pump has the advantages of compact structure,light weight,large displacement and self-absorption,which can transport the fluid with solid particles or more viscous.However,the drainage characteristics of the drainage diaphragm pump is greatly affected by the internal flow resistance,and when the internal flow resistance increases,the pump performance will fall seriously.And because of the complicated structure of the pump,there is little research on the internal flow resistance of the pump.By using FLUENT software and the dynamic mesh simulation technology,we accomplished the dynamic numerical simulation of the drainage diaphragm pump working process,and obtaining the variation of the flow resistance of the drainage diaphragm pump.According to the simulation results,fluid flow resistance is larger in the pump shell,suction valve seat,propeller and end cover key flow region.Local speed and pressure cataclysm phenomenon will appear,but also accompanied by vortex phenomenon,flow loss increases seriously.Through the series of simulation calculations,we optimize the pump sending shell,suction valve seat,propeller,an end cover.After optimization: when pump shell vertical angle is 161°,suction valve seat angle is 65°,the thruster channel height is 86 mm and the boundary degree is 125°,the pump body end cover inner step height is 50 mm and inclination is 73°,the flow loss is greatly decreased,the flow condition has improved a lot.The results of this research provides valuable experience for the further optimization of the pump structure.