External Load Lubricates The Slipper Pair Of Radial Piston Pump Characteristic Influence

Radial piston pump because of its long service life,high control accuracy,high working pressure advantages,is widely used in metallurgy,forging,mining and other large hydraulic system.The variation law of flow field of slipp er pair of radial piston pump in large-scale mechanical work is studied,which provides data support for optimizing the structure of radial piston pump.Aiming at the problem that the load may make the slipper pair of radial piston pump fail when using lar ge mechanical equipment,this paper studies the influence of load on the pressure,flow rate and leakage of slipper pair.The co-simulation model of radial piston pump was established to solve the influence of external load on the lubrication characteristi cs of slipper pair.The fluid domain of slipper pair was numerically simulated and the strength of slipper pair was analyzed,and the distribution characteristics of pressure and deformation in the fluid domain of slipper pair were obtained.The main conte nts are as follows:Firstly,the motion parameters of the radial piston pump are analyzed and calculated,and the expression of the displacement and velocity of the piston is obtained.Then,the force of the piston is analyzed,and the influence of the wo rking pressure and speed of the piston pump is obtained.Then the radial piston pump co-simulation model is established,including dynamic model and hydraulic model.When the dynamic model of the plunger pump is established,the plunger and slipper are fl exible in ANSYS and imported into ADAMS to build the rigid-flexible coupling dynamic model.The AMESim hydraulic system model of the plunger pump is established,including four modules,which are volume module,flow distribution module,load module and mec hanical transmission module.Then the dynamic model and hydraulic system model are combined to form a co-simulation model with ADAMS as the main AMESim.The influence of external load and speed on discharge port flow of plunger pump,pressure change of plu nger chamber and slipper pair leakage is obtained.The results of co-simulation were taken as boundary conditions,and Fluent was used to numerically calculate the fluid domain of the piston pump slipper pair,and the distribution of the pressure field and velocity field and the leakage of the slipper pair fluid domain were obtained.When the rotating speed is constant,the pressure in the fluid domain of the slipper pair increases with the increase of the external load,but its distribution rule is not affected.There are high pressure and low pressure areas in the fluid domain of the slipper pair in the oil absorption area,and the high pressure and low pressure areas are located on both sides of the oil film,while in the oil discharge area,the high pressure area is located at the central oil cavity and the damping hole of the slipper pair.The velocity of oil film fluid domain decreases along the normal direction and the leakage of slipper pair fluid domain also changes with the change of external load.The influence of pressure field and velocity field on slipper structure was further analyzed.The maximum stress and strain appeared in the high pressure area on the upper surface of slipper in the oil absorption area,and the maximum stress and strain appeared in the damping hole at the bottom of the central oil cavity in the oil discharge area.Finally,the model test of the plunger pump is designed to explore the method of measuring the pressure between the plunger cavity and the slipper and the model leakage.