水压组合阀结构设计与仿真研究

发布时间：2018-05-12 15:01

本文选题：水压组合阀 + 水压传动　；参考：《安徽理工大学》2017年硕士论文

【摘要】：水压组合阀是水压传动技术研究的重要领域,也是水压系统重要原件之一。论文所研究的水压组合阀由先导溢流阀和安全阀组合而成,与传统的单功能阀相比,该阀具有稳压和安全的综合性能。水液压系统回路采用双功能的水压组合阀,一定程度上简化水压系统回路,在实现安全环保的同时,实现水压系统的安装、检查以及维修等更加的便捷。根据水压组合阀设计要求,针对水压元件研究中面临的气蚀、腐蚀、磨损、振动等常见技术问题,对水压组合阀的结构以及动态性能进行了仿真分析研究,其过程及结论如下:1.根据水压元件的设计原则,确定水压组合阀主要结构参数。同时对阀的材料进行选择:阀体材料选用铁素体不锈钢,阀座采用聚四氟乙烯材料,阀芯采用不锈钢材料。2.对主阀芯尾椎部分采用表面微造型设计,通过对圆柱、锥形、球冠三种不同形状微造型的压力以及气相体积分数的对比研究,结果表明圆柱形微造型性能最优。同时对不同微造型的加工方法进行研究对比,论文中圆柱形微造型选用激光加工方法。3.利用CAD软件建立主阀芯不同锥角二级节流的二维模型,利用GAMBIT划分网格,在FLUENT软件中对不同模型的主阀芯过流特性进行分析比较。研究结果:一级阀芯锥角30°,二级阀芯锥角45°,并在二级阀芯处采用60°的直线过渡,过渡直线长度为3mm,同时采用半径3mm的圆弧过渡。4.利用AMESIM软件仿真分析水压组合阀中不同参数的主阀阻尼孔、先导阀阻尼孔以及主阀弹簧的刚度对阀动态性能影响。研究结果为主阀阻尼孔直径dd=1mm,先导阀阻尼孔直径d0=2mm,主阀弹簧刚度小于20.5KN/m时,不同刚度对水压组合阀性能影响较小,以取值20.5KN/m时较优,当主阀弹簧刚度取值大于20.5KN/m时,会出现阀口流量不稳定现象。
[Abstract]:Water pressure combined valve is an important field of water pressure transmission technology and one of the important parts of hydraulic system. The hydraulic combination valve studied in this paper is composed of pilot relief valve and safety valve. Compared with the traditional single function valve, the valve has a comprehensive performance of stable pressure and safety. The water hydraulic system loop uses a dual function water pressure combination valve. To a certain extent, the hydraulic system circuit is simplified, and the installation, inspection and maintenance of the hydraulic system are more convenient while realizing the safety and environmental protection. According to the design requirements of the hydraulic pressure combination valve, the structure and dynamics of the hydraulic pressure combination valve are discussed in view of the common technical problems, such as cavitation, corrosion, wear and vibration in the study of hydraulic pressure components. The simulation analysis and research are carried out. The process and conclusion are as follows: 1. according to the design principle of hydraulic components, the main structural parameters of the hydraulic pressure combination valve are determined. At the same time, the material of the valve is selected: the valve body material is ferritic stainless steel, the seat adopts polytetrafluoroethylene material, and the valve core adopts the stainless steel material.2. to the main spool tail vertebra. The comparison of pressure and gas volume fraction of three different shapes of cylindrical, conical and spherical shapes is studied by comparing the pressure of cylinder, cone and spherical crown. The results show that the performance of cylindrical micromodeling is the best. Meanwhile, the processing methods of different micro modeling are compared. In this paper, the cylindrical micromodeling is used to use the laser processing method.3. to make use of CAD software The two dimensional model of two stage throttle of the main valve core with different cone angle is established. The flow characteristics of the main valve core of different models are analyzed and compared in the FLUENT software with GAMBIT. The results are as follows: the first order core cone angle is 30 degrees, the two level valve core cone angle is 45 degrees, and the 60 degree straight line transition is adopted at the two valve core, and the transition line length is 3mm. At the same time, it is adopted at the same time. The circular arc transition.4. with radius 3mm uses AMESIM software to simulate and analyze the main valve damping holes of different parameters in the hydraulic pressure combination valve, the damping hole of the pilot valve and the stiffness of the main valve spring on the dynamic performance of the valve. The results of the study are the main valve damping hole diameter dd=1mm, the damping hole diameter of the pilot valve d0=2mm, and the different stiffness of the main valve spring stiffness less than 20.5KN/m. It has little effect on the performance of the hydraulic pressure combined valve. When the value of 20.5KN/m is better, when the main valve spring stiffness is greater than 20.5KN/m, the flow of the valve port will be unstable.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.52

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