压缩机舌簧排气阀运动模型对比及动态特性影响因素分析

发布时间：2018-06-24 01:06

本文选题：活塞式压缩机 + 舌簧排气阀　；参考：《西安交通大学学报》2017年09期

【摘要】：为了揭示压缩机舌簧阀启闭运动失效过程及其影响因素,建立了阀片运动的单质点模型和悬臂梁模型,在单质点模型中,综合考虑了阀片的有效工作长度、弹力、质量随位移变化的关系,在Matlab环境下,采用四阶龙格-库塔法计算程序对2种模型进行了求解。为了验证模型的有效性,建立了舌簧排气阀位移测量实验系统,并将测量结果与2种模型的计算结果进行了比较,结果表明,单质点模型相比悬臂梁模型能更准确地反映舌簧排气阀的运动规律。利用单质点模型分析了气阀升程、阀片厚度以及阀孔直径对舌簧阀动态特性的影响,分析结果表明:阀片升程增加,舌簧排气阀的初始关闭角减小,最大冲击速度增大;阀片厚度增大,对初始开启角影响不大,但初始关闭角提前;排气阀口直径减小,阀片开启、关闭时间延迟,压缩机能效比降低。该研究可为舌簧阀组结构参数选择、优化设计提供参考。
[Abstract]:In order to reveal the movement failure process of the tongue spring valve of compressor and its influencing factors, the single mass point model and the cantilever beam model of the valve plate motion are established. In the simple mass point model, the effective working length and elastic force of the valve plate are considered synthetically. The relationship between mass and displacement is solved by using the fourth order Runge-Kutta method in Matlab. In order to verify the validity of the model, an experimental system for measuring the displacement of the tongue spring exhaust valve is established, and the measured results are compared with the calculated results of the two models. The results show that, Compared with the cantilever beam model, the single mass point model can more accurately reflect the movement of the tongue spring exhaust valve. The effects of valve lift, valve thickness and valve hole diameter on the dynamic characteristics of tongue spring valve are analyzed by using the single mass point model. The results show that the initial closing angle of the valve increases with the increase of the valve plate lift, and the maximum impact velocity increases. The increase of valve thickness has little effect on the initial opening angle, but the initial closing angle is advanced; the exhaust valve diameter decreases, the valve opening time is delayed, and the compressor energy efficiency ratio decreases. This study can be used as a reference for the selection of structural parameters and optimization design of the tongue spring valve group.
【作者单位】：大连交通大学机械工程学院;大连海洋大学机械与动力工程学院;大连交通大学动车学院;大连交通大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51205035) 辽宁省自然科学基金资助项目(201602133,20170540107) 辽宁省教育厅科学研究一般项目(L2013280)
【分类号】：TB652

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