| Hydraulic valve controls the pressure,flow and direction of fluid flow in the hydraulic system,so the performance of hydraulic valve plays a vital role in the whole system.Hydrodynamic force is one of the key factors that affect the performance of the hydraulic valve.It not only affects the control comfort of the valve,but also affects the linearity between the valve core displacement and the input signal.In severe cases,it may cause the self excited vibration of the valve,and then affect the stability and reliability of the whole hydraulic system.In order to study the steady state hydrodynamic force of the valve cavity,a numerical simulation analysis of the steady flow field is carried out with a minitype directional valve as the research subject.Firstly,according to the characteristics of the inner flow path of the hydraulic slide valve and the actual working condition of the whole machine system,the mathematical model of the steady flow field of the hydraulic slide valve and the steady state analysis model of the inner flow field are established in turn.The flow velocity and pressure distribution near the wall are obtained after the simulation,and then the force of the fluid on the wall surface is calculated.Finally,on the basis of the original structure,three different compensation structures of hydraulic valve are proposed,and the optimal structure is obtained through numerical comparison of hydrodynamic forces.In addition,valve invalidation affects the stability of the system and causes the safety hazard for the staffs normal operation.In order to analyze the reasons of the valve failure,the fluid-solid coupling analysis model of the fluid and valve assembly in the hydraulic valve was established,and the stress concentration area in the inner structure of the valve was obtained.What’s more,we put forward the corresponding improvement measures.This study provides a theoretical basis for the safety and reliability design of slide valve multiplex valve. |
PDF Full Text Request