双喷嘴-挡板电液伺服阀抗污染能力研究

Research on Ability of Anti-pollution for Double Flapper-nozzle Electro Hydraulic Servo-valve

简要介绍了喷嘴挡板伺服阀的结构组成和工作原理。针对双喷嘴挡板电液伺服阀在工作过程中抗污染能力偏低的特点,对其常见的失效机理进行分析,通过对大量故障伺服阀进行拆解和故障分析,并与抗污染能力较好的同类产品相对比,得到了喷嘴挡板伺服阀产生卡堵故障的主要原因。在上述分析的基础上,从结构设计、外部和内部多余物控制等方面进行优化设计和改进,并通过相关实验验证,得出有效提高喷嘴挡板阀抗污能力的具体对策,在试生产和装调测试过程中取得了良好收效。

Based on the weakness of anti-pollution while a double flapper-nozzle electro hydraulic servo-valve is working,its structural compositions and operating principles are briefly introduced at first.Common failure mechanisms are analyzed then.By disassembling a large number of failed servo-valves,we analyze the failures.Also,they are compared with similar products with good anti-pollution ability.The main failure reasons of blocking faults of flapper-nozzle electro hydraulic servo-valve are obtained.Considering the reasons above,we propose improvements and optimizations from aspects of structural design and remainders control.Effective countermeasures of anti-pollution are educed,which are validated by specific experiments.Good results have been achieved during trial production,assemblage and testing.