• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (20): 251-261.doi: 10.3901/JME.2018.20.251

• 控制元件与系统 • 上一篇    下一篇


李长明1, 訚耀保1, 汪明月1, 王法全2   

  1. 1. 同济大学机械与能源工程学院 上海 200092;
    2. 中国航发控制系统研究所 无锡 214063
  • 收稿日期:2017-08-23 修回日期:2017-12-24 出版日期:2018-10-20 发布日期:2018-10-20
  • 通讯作者: 訚耀保(通信作者),男,1965年出生,工学博士,教授,博士研究生导师。主要研究方向为极限环境下的液压与气动基础理论、飞行器能源与舵机和高速气动控制。E-mail:y-yin@tongji.edu.cn
  • 作者简介:李长明,男,1984年出生,博士研究生。主要研究方向为电液伺服元件特性研究与控制。E-mail:lchm_1@163.com;汪明月,男,1991年出生,硕士研究生。主要研究方向为液压锥阀空化与振动特性。E-mail:mingyue1509@163.com;王法全,男,1977年出生,研究员。主要研究方向为航空发动机燃油计量控制。E-mail:374378@qq.com
  • 基金资助:

Influence of High Temperature on Couples Matching and Characteristics of Jet Pipe Electrohydraulic Servovalve

LI Changming1, YIN Yaobao1, WANG Mingyue1, WANG Faquan2   

  1. 1. School of Mechanical Engineering, Tongji University, Shanghai 200092;
    2. China Aviation Power Control System Research Institute, Wuxi 214063
  • Received:2017-08-23 Revised:2017-12-24 Online:2018-10-20 Published:2018-10-20

摘要: 针对射流管伺服阀高温试验中出现的不规则、不可重复的特性,提出将阀体、阀套、阀芯均简化为规则金属体,根据带残余应力的规则金属体在变温度场内的尺寸变化规律,分析了温升对偶件配合的影响及其与伺服阀故障之间的映射关系。结果表明:高温环境下,铝阀体与钢阀套的径向间隙变大,且阀套在轴向获得一定的自由移动空间,破坏了压装其上的接收器与射流喷嘴的空间位置关系,导致伺服阀性能不规则且不可重复;同种钢质但配合表面发生磨削烧伤的阀芯与阀套之间的径向间隙会减小,易出现卡滞,导致伺服阀流量波动或跳跃。提出了改进措施:将接收器尾部增设定位销,使阀体与阀套连为一体;增设锁紧螺钉防止在长期温度交替时接收器由于阀体的膨胀收缩而"拔出";锁紧环内侧加装蝶形簧片,其预压缩变形量大于阀体与阀套伸长量之差时,可消除阀套的轴向自由活动;磨削过程中,适当加大冷却液的流速可加快散热,并对阀芯、阀套的配合表面进行硬度筛查。高温试验结果与理论分析相一致。

关键词: 不规则特性, 高温, 偶件配合, 射流管伺服阀, 抑制措施

Abstract: In view of anomalous and non reproducible test results of jet pipe servovalves under high temperature, it is proposed that the valve body, sleeve and spool can be simplified into regular metal frames, based on the deformation rule of regular metal frame with residual stress under variable temperature field, change of couples' fitting state and its mapping relationship with servovalve failures are analyzed. It shows that in high temperature environment, radial clearance between aluminum valve body and steel sleeve enlarges, and the sleeve obtains some axis space moving randomly, which destroys the fitting relationship between the jet-pipe nozzle and the receiver held in the sleeve, leading to anomalous and non reproducible test results; radial clearance between steel spool and sleeve with grinding burn on the mating surface reduces, which is likely to block and result in flow fluctuation or jump of the valve. Improvements include changing the tail of the receiver into a dowel, which connects the valve body and sleeve as a whole; adding lock bolts to prevent "pull out" of the receiver by expansion and contraction of the valve body under long term temperature alternation; adding butterfly spring inner beside the lock ring, ensures its pre-compression is greater than the elongation difference between the aluminum valve body and the steel sleeve, and eradicates the sleeve's axis free space; increasing the flow rate of coolant to enhance heat dissipation in grinding, and add a hardness screening process for the mating surface of spool and sleeve. Elevated temperature experimental results are in good agreement with the theoretical analysis.

Key words: anomalous characteristics, couples matching, high temperature, jet pipe servovalve, restraining measure