Design And Optimization Of Piezo-Driven Precision Flow Control Valve Spool

Flow control valve in the hydraulic system is an important element, its role is to control fluid flow, flow rate and pressure. General engineering need of fluid control,mostly traditional torque motor drive control valve, this valve has complicated structure, large volume and low control precision, it is difficult to meet the the accurate control of micro fluid flow, especially under high pressure micro fluid flow accurately control. In this paper, a new type of piezoelectric drive precision flow valve is designed by using the piezoelectric ceramic material as the driving element and the metal rubber material. Since the piezoelectric ceramic output capability with precision displacement micro/nano level, so that the piezoelectric drive precision flow valve can take advantage of its high-resolution displacement control valve is turned on, in order to achieve precise control of flow rate output, rubber and metal attached to the valve the Import and Export Department, using its throttled properties, so that the differential pressure valve before and after the opening is reduced, the valve fluid velocity changes gently, reduce cavitation damage.In this paper, the design of the valve uses the flexible hinge lever mechanism as the power source and the valve core movement mechanism between the power transmission device and displacement amplification device. Using finite element analysis software did static and dynamic characteristics analysis of flexible hinge lever mechanism, got the static deformation nephogram and Von Mises Stress nephogram of the mechanism. According to the analysis, the flexible hinge Leverage agencies parameter optimization, optimization results such that the institution meets spool movement having good dynamic characteristics, the volume of the flexible hinge than the previous optimization reduced by 16%. To achieve the lightweight goal of flexible hinge mechanism.In addition, based on the finite element software platform, the finite element model of the valve core and the flow field around the piezoelectric driven precision flow valve is established, fluid-structure interaction was analysed, firstly, the distribution law of the internal fluid pressure field is obtained through the analysis ofthe flow field in the convective domain; then put the fluid analysis results into the domain of the spool solid static analysis, the spool solid domain statics has been analysis, got Von Mises Stress cloud images and the static deformation under the action of fluid solid coupling valve. According to the results of fluid-structure interaction, the structural parameters of the valve core are optimized. After optimization, under the condition of ensuring the work reliability of the valve core,the volume of the valve core is reduced by 13.5%, and the weight of the valve core is realized.