Study On The Influencing Factors And Multi-Objective Optimization Design Of Throttle Groove Spool Valve

The spool valve can be divided into the full circle open spool valve and non-full circle open spool valve,the spool on the convex shoulder of the spool groove is collectively referred to as the non-full circle open spool valve,which works on the principle of throttling,the different relative position between the spool and the valve body means that the throttling area is different,and there is a certain functional relationship between it and the flow area,It is used to accurately control the flow characteristic curve of the valve port.As one of the forces applied to the valve core,the hydraulic force determines the control accuracy of the valve to some extent.In order to complete the design of the orifice of the throttle groove,specific working conditions require specific parameter combinations to achieve its objectives.Discuss and study the influence of the parameter size and combination form of the throttle groove on the flow rate of the valve port and the hydraulic force on the valve core.The target performance required by design can be achieved by changing the size of parameters and the combination form,providing reference for the specific parameters of the design notch.In this paper,V-shaped grooves with typical throttling groove form are taken as the research object.There are two research objectives: one is the flow change rule of the valve port,the other is the hydrodynamic change of the valve core.The multiobjective optimization is carried out for the purpose of improving the flow rapidity of V-type throttling groove and reducing the hydraulic force.The contents are as follows:(1)Firstly,the research background and significance of the throttle groove spool valve are briefly introduced,and then a variety of single throttle groove types and a variety of single groove combination forms are briefly described,and the research status at home and abroad are discussed.(2)The mathematical model of V-type throttling slot spool valve is established,the equivalent flow area of the groove and the hydraulic force received by the valve core are theoretically derived,the relationship between flow area,hydraulic force and structural parameters are analyzed,and the structural parameters that will affect the hydraulic force received by the valve core and the valve port flow are selected.With the selected parameters,determine the level of each parameter after the test design,construct the test design scheme,mathematical analysis method to analyze the test results,mathematical analysis method to analyze the test results to get the valve port flow and valve core fluid power with the structural parameters of the throttle groove changes.The e test results can be obtained after qualitative analysis and quantitative calculation of the influence factors on the valve port flow and valve core fluid power sensitivity sequence.(3)After the quantitative analysis of the influence of each parameter on the throttling characteristics of the throttling groove,the qualitative analysis is made to discuss the relationship between the change of throttling groove parameters and the velocity distribution of flow field,jet Angle,pressure distribution,flow rate and the hydraulic force of the valve core.The polynomial fitting is made between the structural parameters of the throttling groove and the corresponding flow rate and the hydraulic force of the valve core.The variation curves of flow rate and valve core fluid power with various structural parameters are obtained.(4)The flow and hydrodynamic data obtained by numerical simulation were corresponding to the orthogonal experimental design scheme,and the curve of flow and hydrodynamic changes with the opening volume was established to specifically analyze the flow and hydrodynamic changes.The data of the orthogonal experimental design scheme was insufficient,so the corresponding flow and hydrodynamic data of all parameter combinations within the given parameter range were predicted by means of curved surface interpolation.Then,aiming at improving the fast response of flow rate and reducing the hydraulic force of valve core,the multi-objective optimization algorithm is used to search for optimization in the whole size range,and the Pareto solution set conforming to the optimization objective is obtained.