JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.4 P.265-276

http://doi.org/10.1631/jzus.A2000582

A parametric study on unbalanced moment of piston type valve core

Author(s): Jin-yuan Qian, Juan Mu, Cong-wei Hou, Zhi-jiang Jin
Affiliation(s): Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China; more
Corresponding email(s): jzj@zju.edu.cn
Key Words: Piston type valve core, Unbalanced moment, Geometrical parameters, Computational fluid dynamics (CFD)

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Abstract: In this paper, the piston type valve core and the unbalanced moment on its bottom are studied. To decrease the influence of non-common geometrical factors, a simplified model of the piston type globe valve is proposed in this study. Based on the computational fluid dynamics (CFD) method, the effects of different geometrical parameters on the unbalanced moment existing on the bottom of the valve core, which include the bending radius of the inlet flow channel, the diameter of the special-shaped pipe, and the height of the valve core, are studied. Finally, the effects of geometrical parameters on the unbalanced moment on the bottom of the valve core are clarified by correction and variation classification and provide a basis for further optimizing the structure of the piston type valve. The results show that the unbalanced moment decreases with the increase of the bending radius of the inlet flow channel, but increases with the increase of the diameter of the special-shaped pipe and the height of the valve core. Moreover, the relation between the unbalanced moment and flow rate is proposed.

活塞式阀芯不平衡力矩的参数化分析

目的:活塞式阀芯底面受到的不平衡力矩,不仅会让阀芯有倾覆的趋势,甚至会造成阀杆和阀芯变形卡滞,最终导致阀门内漏.本文提出了活塞式截止阀的简化模型,基于计算流体力学方法,探究了入口流道弯曲半径、异形管直径和阀芯高度等特征结构参数对阀芯底面不平衡力矩的影响机制,为活塞式阀门结构的进一步优化提供了依据.
创新点:1. 建立了活塞式截止阀的简化模型,研究简化模型特征结构参数对活塞式阀芯底面不平衡力矩的影响;2. 对简化活塞式截止阀在不同入口流道弯曲半径、异形管直径和阀芯高度下进行流动及阀芯受力分析.
方法:1. 建立具有不同入口流道弯曲半径的简化活塞式截止阀的数值计算模型,并比较分析入口流道弯曲半径对阀内速度以及阀芯受力情况的影响(图7~9);2. 建立具有不同异形管直径的简化活塞式截止阀的数值计算模型,并比较分析异形管直径对阀内压力以及阀芯受力情况的影响(图10~12);3. 建立具有不同阀芯高度的简化活塞式截止阀的数值计算模型,并比较分析阀芯高度对阀芯受力情况的影响(图13),总结得出阀芯受到的合力矩与阀门流量之间的关系(图14).
结论:1. 随着入口流道弯曲半径的增大,阀芯底面受到的不平衡力矩逐渐减小;在实际应用中,可以通过适当增大阀门入口流道弯曲半径来减小不平衡力矩.2. 随着异形管直径的增大,阀芯底部的不平衡力矩略有增大;在阀门的设计中,可以忽略异型管直径对不平衡力矩的影响.3. 阀芯高度增大,出口流量随之增大,加剧了阀芯底面力矩分布不平衡的现象.
关键词：活塞式阀芯;不平衡力矩;结构参数;计算流体力学

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