Characteristics of Electro-hydraulic Servovalve with an Asymmetric Nozzle Flapper

China Mechanical Engineering ›› 2011, Vol. 22 ›› Issue (8): 957-960,970.

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Characteristics of Electro-hydraulic Servovalve with an Asymmetric Nozzle Flapper

Yin Yaobao;Meng Wei

Tongji University,Shanghai,200092

Online:2011-04-25 Published:2011-05-04
Supported by:

National Natural Science Foundation of China（No. 50775161）;

Aviation Science Foundation of China（No. 20090738003）;
National High-tech R&D Program of China (863 Program) （No. 2007AA05Z119）

非对称喷嘴挡板式电液伺服阀特性分析

訚耀保;孟伟

同济大学,上海,200092

基金资助:
国家自然科学基金资助项目(50775161)；航空科学基金资助项目(20090738003)；国家高技术研究发展计划(863计划)资助项目(2007AA05Z119)
National Natural Science Foundation of China（No. 50775161）;

Aviation Science Foundation of China（No. 20090738003）;
National High-tech R&D Program of China (863 Program) （No. 2007AA05Z119）

Abstract

Abstract:

The structure and characteristics of an electro hydraulic servovalve with an asymmetric nozzle flapper which has a pair of hydraulic resistances in

the nozzle chambers were analyzed. The load 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. The load pressure characteristics are asymmetric, and the cross point of the two 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

摘要：

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性。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性、零位压力特性,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性度，液阻系数的取值宜在1.5至2.5之间。

关键词:

非对称喷嘴挡板, 电液伺服阀, 节流器, 容腔, 压力特性

CLC Number:

TH137.5

YIN Yao-Bao, MENG Wei.

Characteristics of Electro-hydraulic Servovalve with an Asymmetric Nozzle Flapper

[J]. China Mechanical Engineering, 2011, 22(8): 957-960,970.

訚耀保, 孟伟.

非对称喷嘴挡板式电液伺服阀特性分析

[J]. 中国机械工程, 2011, 22(8): 957-960,970.

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Characteristics of Electro-hydraulic Servovalve with an Asymmetric Nozzle Flapper

非对称喷嘴挡板式电液伺服阀特性分析

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