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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1265-1273    DOI: 10.3785/j.issn.1008-973X.2019.07.004
机械与能源工程     
小球式旋转直驱压力伺服阀卡滞机理研究
陆亮1(),夏飞燕1,訚耀保1,*(),原佳阳1,郭生荣2
1. 同济大学 机械与能源工程学院，上海 200092
2. 南京机电液压工程研究中心 航空机电系统综合航空科技重点实验室，江苏 南京 210061
Spool stuck mechanism of ball-type rotary direct drive pressure servo valve
Liang LU1(),Fei-yan XIA1,Yao-bao YIN1,*(),Jia-yang YUAN1,Sheng-rong GUO2
1. College of Mechanical Engineering, Tongji University, Shanghai 200092, China
2. Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing Mechatronic and Hydraulic Engineering Research Centre, Nanjing 210061, China
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摘要：

针对小球式旋转直驱压力伺服阀（BRDDPSV）静态测试卡滞问题，建立阀芯运动全局函数，包括基于缝隙流理论建立倾斜阀芯径向力模型，基于Coulomb摩擦理论建立阀肩触壁静摩擦-滑动摩擦模型. 理论解析曲线合理复现了静态测试卡滞问题：偏心驱动下阀芯逆时针旋转倾斜，右侧阀肩触壁，初始静摩擦导致阀芯卡滞，逐渐提升的电流水平克服摩擦形成阀芯运动超调. 为了保证电流指令与控制压力的近似比例特性，阀芯回拉复位，形成重复的正向驱动阀芯卡滞. 基于阀肩不触壁原则，获得阀芯是否卡滞阈值条件. 研究结果表明：增大阀芯与阀套初始半径间隙或减小小球偏离阀芯轴线的初始偏心量，均可以提高阀芯不卡滞的输出压力阈值；对于21 MPa系统压力及0~8 MPa输出压力的实际需求，在不改变其他参数的情况下，将初始半径间隙和初始偏心距分别调整为5.1 μm和0.2 mm，可以在维持原有性能的基础上获得阀芯运动全局不卡滞的最优解.
关键词： 小球式旋转直驱;  压力伺服阀;  阀芯卡滞;  防卡滞参数优化    
Abstract:

Aiming at the sticking problem of ball-type rotary direct drive pressure servo valve (BRDDPSV), the global motion function of the spool was established, including the radial force model of inclined spool based on gap flow theory and the static-sliding friction between the spool shoulder and sleeve wall based on Coulomb friction theory. Sticking problem was reasonably reappeared by theoretical analysis curve: spool rotates and tilts counterclockwise by eccentric force, then the right shoulder of spool contact sleeve wall, initial static friction leads to spool sticking, gradually rising current overcomes friction to form spool movement overshoot. The valve core is pulled back to form a repetitive positive drive spool block in order to ensure the approximate proportion of current command and control pressure. The threshold condition of the sticking problem was obtained based on the principle of non-contact between spool shoulder and sleeve wall. Results show that increasing the initial radius gap between spool and bush or decreasing the initial eccentricity of ball from spool axis can increase the output pressure threshold of non-stuck. For the actual demand of 21 MPa system pressure and 0-8 MPa output pressure, the initial radius clearance and the initial eccentricity were adjusted to 5.1 μm and 0.2 mm respectively. The optimal solution of global non-sticking can be obtained by maintaining the original performance.
Key words: rotary ball direct drive    pressure servo valve    spool stuck    anti-stuck parameter optimization
收稿日期: 2018-08-23 出版日期: 2019-06-25
CLC:  TH 137  
通讯作者: 訚耀保     E-mail: luliang829@tongji.edu.cn;y-yin@tongji.edu.cn
作者简介: 陆亮(1983—)，男，助理教授，从事激振流体力学基础理论与机电液控制技术研究. orcid.org/0000-0002-9403-330X.E-mail： luliang829@tongji.edu.cn
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引用本文:

陆亮,夏飞燕,訚耀保,原佳阳,郭生荣. 小球式旋转直驱压力伺服阀卡滞机理研究[J]. 浙江大学学报(工学版), 2019, 53(7): 1265-1273.

Liang LU,Fei-yan XIA,Yao-bao YIN,Jia-yang YUAN,Sheng-rong GUO. Spool stuck mechanism of ball-type rotary direct drive pressure servo valve. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1265-1273.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.07.004    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I7/1265

图 1  小球式旋转直驱压力伺服阀结构原理
参数 参数值
电机电阻Rc/Ω 23.3
阀芯质量mv/g 5
阀芯总长度l/mm 24
阀芯直径Dv/mm 6
阀肩长度L/mm 6.4
小球偏离阀芯轴线距离h0/mm 0.5
阀芯与阀套间的初始半径间隙δ/μm 3
滑阀预开口量U/mm 0.1
负载容腔容积V/mL 10
工作介质 15#液压油
介质温度θ/°C 25±0.5
表 1  小球式旋转直驱压力伺服阀结构工质参数
图 2  压力伺服阀静态特性测试实验台
图 3  静态测试实验曲线
图 4  小球式旋转直驱压力伺服阀系统框图
图 5  阀芯受力示意图
图 6  阀芯倾斜时阀肩和阀套的位置关系
图 7  缝隙压差流引起的径向力与阀芯径向位移和倾斜角度的关系
图 8  阀肩触壁摩擦受力示意图
图 9  控制压力理论计算结果与实验结果对比
图 10  理论求解阀芯水平运动速度曲线
图 11  理论求解阀芯径向位移曲线
图 12  阀芯卡滞压力阈值理论与实验对比
图 13  不同初始半径间隙下的阀芯卡滞与否区间划分
图 14  不同初始偏心量下的阀芯卡滞与否区间划分
图 15  全局不卡滞的结构参数匹配（ps=21 MPa，pL0=8 MPa）
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