流体机械

2019, v.47;No.559(01) 25-30+47

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2D伺服阀先导级螺旋阀口稳态液动力的研究
Study on Steady-state Flow Force of Pilot Helical Orifice of 2D Servo Valve

陆倩倩;阮健;李胜;
Lu Qianqian;Ruan Jian;Li Sheng;Zhejiang University City College;Zhejiang University of Technology;

摘要(Abstract):

为研究二维(2D)伺服阀的稳定性及其影响因素,结合2D阀先导级螺旋阀口双流道中心对称的结构特点,通过理论分析和流体动力学仿真,得出流体流经螺旋阀口产生的稳态液动力属于空间力,且2个对称阀口处稳态液动力的径向分力大小相同,方向相反;而轴向液动分力和周向液动分力形成的力矩随着阀口开度增加逐渐减小,yoz平面的射流角度也逐渐减小,且当阀口开度小于0.1 mm时,减小幅度很大,开度大于0.2 mm时,趋于稳定;随着入口流速的增加,轴向液动力和周向液动力矩逐渐增加。结果表明稳态液动力的轴向分力及周向力矩促使先导阀口关闭,对阀芯稳定具有促进作用。
To analyze the stability and influence factors of 2 D servo valve,through theoretical analysis and simulation of fluid dynamics in combination with the structural symmetric characteristics of the double-passage centers of the pilot helical orifice of 2 D servo valve,it was concluded that the steady-state force caused by the fluid flow across the orifice is a space force,and the radial components of the steady state forces at the two symmetric orifices are equal and opposite in direction;whereas the torque formed by the axial flow force component and circumferential hydraulic force component,as well as the jet angle on yoz plane,decrease with the increase of the orifice opening,and when the orifice opening is less than 0.1 mm,the amplitude of decrease is very big,when the opening is larger than 0.2 mm,they tend to be stable;with the increase of entrance flow rate,the axial flow force and circumferential hydraulic torque increase gradually. The results show that the axial force component and circumferential torque of the steady-state hydraulic force forced the pilot valve orifice to close,which can promote the stability of the spool in the valve.

关键词(KeyWords): 2D伺服阀;先导级;螺旋阀口;稳态液动力
2D servo valve;pilot valve;helical orifice;steady-state flow force

Abstract:

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基金项目(Foundation): 国家自然科学基金资助项目(51605430);; 浙江省自然科学基金项目(LQ19E050018)

作者(Author): 陆倩倩;阮健;李胜;
Lu Qianqian;Ruan Jian;Li Sheng;Zhejiang University City College;Zhejiang University of Technology;

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