植保机械用泵稳压气室隔膜变形特性研究

吴姝,宋俊伟,魏新华,蒋斌,沈雪金

振动与冲击 ›› 2019, Vol. 38 ›› Issue (7) : 257-263.

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (7) : 257-263.
论文

植保机械用泵稳压气室隔膜变形特性研究

  • 吴姝,宋俊伟,魏新华,蒋斌,沈雪金
作者信息 +

Deformation characteristics of stable pressure chamber diaphragm for pumps of plant protection machinery

  • WU Shu,SONG Junwei,WEI Xinhua,JIANG Bin,SHEN Xuejin
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摘要

针对植保机械类用容积泵稳压气室工作过程,为丰富其稳压气室设计理论进而解决稳压气室与隔膜泵液体之间隔膜寿命不足的问题,本文以ZMB240型活塞式隔膜泵为研究对象,建立简化的隔膜泵三维有限元分析模型,在Workbench平台下的FSI模块,对稳压气室在初始压强分别为0.3MPa、0.4MPa、0.5MPa、0.6MPa和0.7MPa工况下进行双向流固耦合分析,监测橡胶隔膜一个周期内隔膜最大位移和等效应力变化情况。仿真结果表明:隔膜变形量随稳压气室初始压强的增加反而减少,不同初始压强下隔膜变形量均在时间t=0.0318s达到最大;一个运动周期内隔膜应力脉动幅度很大,最大应力约为最小应力的4倍,隔膜端部边缘为应力集中区域。通过本文的研究以期得到模拟稳压气室隔膜运动中应力和位移变化的合理数值模拟方法,以指导稳压气室隔膜设计,进一步为隔膜泵稳压气室设计提供参考。

Abstract

In order to enrich the design theory of stable pressure chamber and solve the problem of insufficient life of the diaphragm between stable pressure chamber and diaphragm pump fluid,here,ZMB240 piston diaphragm pump was taken as the study object to establish a simplified diaphragm pump’s 3-D finite element analysis model. With FSI module of Workbench platform,two-way fluid-solid interaction analyses were performed for the diaphragm pump under working conditions with initial pressure of 0.3 MPa,0.4 MPa,0.5 MPa,0.6 MPa and 0.7 MPa,respectively to monitor the diaphragm’s maximum displacement and equivalent stress variations within a cycle. The simulation results showed that the diaphragm deformation decreases with increase in initial pressure of stable pressure chamber,and all diaphragm deformations under different initial pressures reach the maximum at time t=0.031 8 s; stress fluctuation of the diaphragm is great within a motion period,and the maximum stress is 4 times of the minimum one,the diaphragm end edge is the stress concentration area.  Through studying,a reasonable numerical simulation method to predict stress and displacement variations of stable pressure chamber diaphragm was obtained to guide the design of stable pressure chamber diaphragm and provide a reference for stable pressure chamber design of diaphragm pumps.

关键词

隔膜泵 / 隔膜 / 流固耦合 / 波动

Key words

Diaphragm pump
/ diaphragm / fluid - solid coupling / oscillation

引用本文

导出引用
吴姝,宋俊伟,魏新华,蒋斌,沈雪金. 植保机械用泵稳压气室隔膜变形特性研究[J]. 振动与冲击, 2019, 38(7): 257-263
WU Shu,SONG Junwei,WEI Xinhua,JIANG Bin,SHEN Xuejin. Deformation characteristics of stable pressure chamber diaphragm for pumps of plant protection machinery[J]. Journal of Vibration and Shock, 2019, 38(7): 257-263

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