先导式气动减压阀性能分析及实验研究

发布时间：2018-11-10 22:48

【摘要】：先导式气动减压阀是一种以压缩气体为工作介质,采用先导结构的反馈来提供稳定工作压力的气动控制元件。它能适应气动系统的波动性,被广泛应用于普通工业用气的场合,成为目前气动技术重要的研究方向之一。本文提出一种应用在工业用气现场的先导式气动减压阀。由于减压阀的小型化,模块化能降低成本、方便更换零件,因此结构上采用内部先导式来减小体积。然后提出减压阀整体结构布局,提出先导阀部件和主阀部件的结构设计,设计过滤节流螺钉以及排气螺栓。对减压阀各零件抽象出其物理模型,利用MATLAB/Simulink创建减压阀整体参数方程,对影响气动系统稳定工作状态和动态压力调节的原因进行仿真分析,得到各个参数的作用规律。最后设计并实施先导式气动减压阀实验。实验结果显示,所开发的先导式气动减压阀最大工作流量可达2000L/min。本文主要内容概括如下:(1)叙述气动减压阀种类,总结气动减压阀研究现状,点明本文工作的重点与工作内容。(2)详述所设计减压阀主要部件和工作原理,并从气动系统的技术指标出发,对先导式气动减压阀的结构进行分析与设计,确定了先导式气动减压阀采用的密封形式。初步选取阀体参数的合理范围。(3)通过对先导组件、主阀膜片、阀杆阀芯组件进行受力分析,分别建立先导式气动减压阀中先导组件和主阀膜片以及阀杆阀芯组件的数学模型。用热力学理论描述减压阀内各个气腔系统的压力-温度微分方程,了解影响先导式气动减压阀性能的因素。(4)通过MATLAB/Simulink软件搭建所设计减压阀的微分方程,仿真分析输入压力、节流孔直径、反馈孔直径、主阀口直径以及控制气腔初始体积等参数对减压阀性能的影响规律。进而确定合理的阀体参数。(5)介绍了先导式气动减压阀输出压力/流量测试系统基本原理,选择实验器材测试减压阀工作性能,仿真与实验对比结果表明了仿真模型的准确性。(6)总结了全文的主要工作与成果,为未来进一步的研究提供方向。
[Abstract]:The pilot pneumatic pressure reducing valve is a kind of pneumatic control element which uses compressed gas as working medium and adopts the feedback of pilot structure to provide stable working pressure. It can adapt to the fluctuation of pneumatic system, and is widely used in the field of ordinary industrial gas. It has become one of the most important research directions of pneumatic technology at present. In this paper, a pilot pneumatic pressure reducing valve applied to industrial gas field is presented. Because of the miniaturization of the pressure reducing valve, modularization can reduce the cost and facilitate the replacement of the parts, so the internal pilot type is adopted to reduce the volume in the structure. Then the whole structure layout of pressure reducing valve, the structure design of pilot valve and main valve component, filter throttling screw and exhaust bolt are proposed. The physical model of the parts of the pressure reducing valve is abstracted and the integral parameter equation of the pressure reducing valve is created by using MATLAB/Simulink. The reasons that affect the stable working state of the pneumatic system and the dynamic pressure regulation are simulated and analyzed, and the action law of each parameter is obtained. Finally, the pilot pneumatic pressure reducing valve experiment is designed and implemented. The experimental results show that the maximum working flow of the developed pilot pneumatic pressure reducing valve can reach 2000L / min. The main contents of this paper are summarized as follows: (1) describing the types of pneumatic pressure relief valves, summarizing the present research situation of the pneumatic pressure relief valves, pointing out the emphases and contents of the work in this paper. (2) expounding the main components and working principles of the designed valves. Based on the technical specifications of the pneumatic system, the structure of the pilot pneumatic pressure relief valve is analyzed and designed, and the sealing form of the pilot pneumatic pressure reducing valve is determined. The reasonable range of valve body parameters is preliminarily selected. (3) Force analysis of pilot assembly, main valve diaphragm, stem spool assembly, The mathematical models of the pilot assembly, the main valve diaphragm and the stem spool assembly in the pilot pneumatic pressure reducing valve were established respectively. The differential equations of pressure-temperature in the air chamber system in the valve are described by thermodynamics theory, and the factors influencing the performance of the pilot pneumatic pressure reducing valve are understood. (4) the differential equation of the designed valve is constructed by MATLAB/Simulink software. The effects of input pressure, throttle diameter, feed back hole diameter, main valve orifice diameter and the initial volume of the control chamber on the performance of the valve are simulated and analyzed. Then the reasonable valve body parameters are determined. (5) the basic principle of the pilot pneumatic pressure relief valve output pressure / flow test system is introduced, and the experimental equipment is selected to test the working performance of the valve. The results of simulation and experiment show the accuracy of the simulation model. (6) the main work and achievements of the paper are summarized, which provides a direction for further research in the future.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH138.521

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