Numerical Simulation Analysis Of Floating Cup Pump Based On Virtual Prototype

Axial piston pump has become developable main direction of high pressure and large displacement hydraulic pump due to its compact structure,low noise,high power density,excellent performance and long service life.With continuous development of pollution cleaning technology and diversification of working medium,application of axial piston pump will become more and more extensive.Floating cup pump is a new type of hydraulic power component by combining advantages of traditional axial piston pumps.It has certain advantages in improving flow pulsation,reducing noise,reducing wear and improving work efficiency,and subversive changes have also been made in the structure.In order to understand basic performance of floating cup pump and do some preliminary work for scholars who study floating cup structure in China,this paper has made detailed research and analysis.In theory,stresses of key components such as plunger,floating cup and barrel are analyzed,deriving relevant parameters affecting power density of floating cup pump and the relationship between maximum stress on plunger neck and diameter of spherical joint & total number of plungers and barrel tilt angle;Kinematics and dynamics characteristics of floating cup pump and elliptical motion trajectory of floating cup are analyzed,hold down spring that prevents floating cup from being stuck is designed according to these,and deformation is observed by finite element simulation,then,proposing reinforcement area and method.The leakage characteristics of ball head plunger pairs of floating cup pump are analyzed,and comparison of three cavity sizes numerical simulation shows plunger cavity with diameter of 8mm and depth of 6mm can effectively inhabit leakage between plunger pairs after deformation.Theoretical flow pulsation formula of floating cup pump is given and design methods of reducing flow pulsation by plunger misalignment type and fully symmetrical type are analyzed.Comparing flow unevenness coefficient,plunger misalignment arrangement has the advantage of flow pulsation.Virtual prototype model of floating cup pump with 24 plungers structure is created by ADAMS and AMESim softwares for co-simulation.Outlet flow,pressure and pulsation of floating cup pump are tested by simulation,and compared with theoretical analysis,accuracy of virtual prototype model is verified.Then motion characteristics of floating cup pump and axial movement of floating cup under different barrel inclination angles are analyzed.According to displacement trajectory of floating cup on barrel plate and axial velocity and acceleration curves,it is consistent with theoretical analysis.Next torque transmission characteristics of floating cup pump are analyzed,which proves advantage of floating ability of floating cup.In addition,comparing leakage amount,superiority of cavity plunger head improve seal is obtained,and by testing outlet flow of floating cup cavity and displacement flow of pump under symmetrical and misaligned two plunger distribution structures,it is verified that misaligned structure flow oscillation amplitude is smaller,pulsation is more stable,work is more stable.Through various tests verify simulation results of virtual prototype model of floating cup pump are basically consistent with change laws of parameters obtained by theoretical analysis.