锥阀流动仿真分析及其结构改进

发布时间：2018-01-08 06:18

本文关键词：锥阀流动仿真分析及其结构改进　出处：《长安大学》2011年硕士论文　论文类型：学位论文

【摘要】：锥阀在液压控制阀中占重要地位,广泛应用于螺纹插装阀、二通插装阀以及其他传统非插装式控制阀。其阀口通流特性、阀芯受力特性、瞬态响应特性等都影响系统的控制精度和稳定性。同时,阀口节流作用产生的温升、气蚀等危害,也会影响锥阀的应用。因此,采用理论分析和仿真方法对锥阀上述特性及节流产生危害的研究有着重要的理论意义和工程应用价值。本文首先系统研究了目前不同液压阀产品中锥阀结构特点,比较了其共同点和差异,讨论了针对液压锥阀需要研究的重点问题。研究了锥阀流量增益、液阻及液动力计算方法,分析了结构参数对其影响,并指出阀芯锥角是影响锥阀性能的最主要参数。以锥阀芯与直角刃阀座形式锥阀为具体研究对象,基于液压系统仿真平台,建立该锥阀仿真模型,并对其稳态和瞬态特性进行了仿真分析。基于仿真结果,讨论了弹簧刚度和预紧力对锥阀流量-压力稳态和瞬态响应特性的影响。对锥阀内液流状态进行了数值仿真,得到阀芯静止状态下和阀芯在不同运动速度下的流场,直观反映出阀芯静止和以不同速度运动时阀内液流速度及静压分布。指出锥阀中易产生气穴的区域主要是阀口后侧。同时,仿真计算得到的阀口“负压”、阀芯温升及阀芯轴向力和侧向力可为锥阀的设计及合理使用提供依据。在理论分析和数值仿真的基础上,对锥阀结构进行了改进。改进后,锥阀通流特性得到改善,气穴影响减弱。
[Abstract]:The cone valve in the hydraulic control valve plays an important role, is widely used in cartridge valves, two cartridge valves and other traditional non cartridge type control valve. The valve flow characteristics, mechanical characteristics of valve core, transient response characteristics affect the control precision and stability of the system. At the same time, from the valve port the throttling effect of temperature rise, cavitation and other hazards, will also affect the application of the cone valve. Therefore, the theoretical analysis and Simulation Research on the harm characteristics and the throttle cone valve has important theoretical significance and engineering application value.
This paper firstly studies the different hydraulic valve products in cone valve structure, compares the similarities and differences, discusses the key problems for hydraulic poppet valve need to be studied. Study the flow gain of cone valve, calculation method of fluid resistance and fluid force, analyzed the influence of structural parameters on the valve cone angle, and pointed out that is the most important parameter affecting the performance of the poppet valve.
The poppet cone valve seat and the rectangular blade form as the research object, the hydraulic system simulation platform based on the establishment of the simulation model of the cone valve, and the steady and transient characteristics are analyzed. Based on the simulation results, the influence of the spring stiffness and preload on response of cone valve flow - pressure and steady transient discussion.
The state of fluid flow cone valve is studied by numerical simulation, flow valve spool in the stationary state and different velocities, intuitively reflect the spool rest and at different speeds when the valve flow velocity and static pressure distribution. It is pointed out that the easy cavitation cone valve area is mainly the valve port side. At the same time, the calculated simulation of valve spool "negative pressure", the temperature rise and the spool axial force and lateral force can provide the basis for the design and reasonable use of the cone valve.
On the basis of theoretical analysis and numerical simulation, the structure of the cone valve is improved. After the improvement, the flow characteristic of the cone valve is improved and the effect of the cavitation is weakened.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.52

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