非对称喷嘴挡板式电液伺服阀特性分析.pdf

) ) ) 訚耀保 孟 伟 訚耀保 孟 伟 同济大学, 上海, 200092 :分析了一种新型非对称喷嘴挡板式电液伺服阀的结构和特 该阀在两喷嘴容腔处设置一 对阻尼节流器, 得到了喷嘴容腔和负载压力特 零位压力特 , 以及力矩马达驱动力和刚度设计方法 理论和试验结果表明: 内置阻尼节流器的电液伺服阀喷嘴容腔的零位压力小于供油压力的50%, 负载容 腔的零位压力大于供油压力的50% ; 液阻系数不对称时, 负载压力曲线不对称, 其交点偏离中位; 为提高 零位时负载压力的线 度, 液阻系数的取值宜在115至215之间 :;;; ; :T H137.5 : 1004 ) 132X(2011) 08) 0957) 04 Characteristics of Electro- hydraulic Servovalve with an Asymmetric Nozzle Flapper Yin Yaobao Meng Wei Tongji niversity,Shanghai,200092 Abstract: The structure and characteristics of an electro hydraulic servovalve with an asymmetric nozzle flapper which has a pair of hydraulicresistances in the nozzle chambers were analyzed. T heload pressure characteristics, nozzle chamber pressure characteristics and the pressure characteristics at zero point were obtained. The design method of force and rigidity of the torque motor were discussed. The theoretical results are in good agreement with the experimental ones.The load pressure of electro hydraulic servovalve with an asymmetric nozzle flapper at zero point is bigger than 50% of supply pressure, but the nozzle chamber pressure is less than 50% of supply pressure. T he load pressure characteristics are asymmetric, and the cross point of thetwo load pressure curves deviates the neutral point.The coefficient of hydraulic resistance is suggested to be 1.5 to 2. 5 in order to get good linearity of load pressure. Key words: asymmetric nozzle flapper; electro hydraulic servovalve; resistance; chamber; pressure characteristics 0 引言 20 50 ,Moog , , [ 1-2] , [ 10]