气动节流阀开度调节机构可靠性研究.pdfVIP

摘 要 气动节流阀是气压传动与控制系统中常用的一类气动元件，控制着执行元件的运 动速度与稳定性，同时，气动节流阀良好的可靠性是保证控制系统正常工作的重要条 件，因此要求节流阀应该具有系统所需的阀口面积曲线和流量控制曲线、合理的泄漏 等级和较高的使用寿命等，这些性能的计算和分析都是保证高品质节流阀的关键环节。 本文所设计的节流阀采用节流槽滑阀形式，通过两个高低气压口联合控制主阀的 节流阀先导结构。经过理论计算，分析了三种形式节流槽口的等效节流面积和节流面 积特性，确定了适合于气动先导阀的节流槽口形式。 本文主要是对于调节机构的可靠性进行分析，包括机构的设计和稳态特性分析以 及调节机构校核。结合节流阀的工况要求，确定调节机构的设计尺寸和密封形式，并 分析了节流阀调节机构的稳态特性。利用 FLUENT 模拟仿真了不同开度下的稳态流 场，得出节流阀的流量调节曲线、压力场、温度场以及阀芯的受力情况。 基于流固耦合理论，应用ANSYS Workbench 软件模拟仿真了流场对于阀芯的性 能的影响，确定出不同开度下阀芯的变形量和应力场，结果表明，所设计的阀芯能够 满足可靠性要求。 关键词：气动节流阀 可靠性分析 滑阀槽口 稳态分析 流场仿真 流固耦合分析 I ABSTRACT Pneumatic throttle valve is a kind of pneumatic components which is widely used for pneumatic transmission and control system to controls the speed and stability of the actuator. Good reliability of pneumatic throttle valve is an important condition to ensure the normal operation of the control system, so the throttle should have the required valve orifice area curve and flow control curve, the reasonable leakage levels, the higher service life, and so on. These properties are computed and analyzed to ensure the high quality of throttle valve In this paper, the design of the throttle valve adopts throttling grooves spool form, through both high and low pressure port to control the main valve. Through the theoretical calculation, the three forms of throttling notches equivalent throttling area and throttling area characteristics have been analyzed and determine the suitable pneumatic pilot valve throttle notch form. This paper is mainly for the reliability analysis of regulating mechanism includes the design and steady state characteristics of mechanism analysis and regulatory agencies checking. The design size of adjusting mechanism