具有对称均等负重合量的气动伺服阀零位流动状态分析  

Flow Characteristics at Neutral Position of Pneumatic Servovalve with Symmetric Even Underlaps

作　　者：訚耀保[1] 李长明[1] 韩啸啸[1] 荒木献次 

机构地区：[1]同济大学机械工程学院,上海200092 [2]日本国立埼玉大学工学部,日本埼玉3388570

出　　处：《流体传动与控制》2008年第6期9-12,共4页Fluid Power Transmission & Control

基　　金：国家"863"高科技计划(2007AA05Z119);上海市浦江人才计划(06PJ14092);国家自然科学基金(50775161)资助项目。

摘　　要：分析了具有对称均等负重合量的气动伺服阀在不同供气压力时上游供气节流口和下游排气节流口的流动状态。排气压力为一个标准大气压,供气压力小于0.2374MPa时,零位时的上游两个供气节流口和下游两个排气节流口均为亚音速流动;供气压力等于0.2374MPa时,零位时的上游两个供气节流口为亚音速流动,下游两个排气节流口处于临界流动,即亚音速流动和超音速流动的分界点;供气压力大于0.2374MPa时,零位时的上游两个供气节流口为亚音速流动,下游两个排气节流口为超音速流动,且在零位处的负载压力为供气压力的80.75%。The flow characteristics of control orifices of a pneumatic servovalve with even underlaps under different supply pressure are discussed. The four control orifices of upstream side and down stream side of the pneumatic servovalve at neutral position are subsonic flow when the supply pressure is less than 0.2374MPa. The two control orifices of upstream side of the pneumatic servovalve at neutral position are subsonic flow, but the two control orifices of downstream side are critical flow when the supply pressure is 0.2374MPa. The two control orifices of upstream side of the pneumatic servovalve at neutral position are subsonic flow, but the two control orifices of downstream side are sonic flow when the supply pressure is large than 0.2374MPa, and the pressure of the load ports at x=0 is as much as 80.75% of the supply pressure for a servovalve with symmetric and even underlaps of the spool valve.

关 键 词：气动技术 气动伺服阀 均等负重合量 亚音速流动 超音速流动 

分 类 号：TH137[机械工程—机械制造及自动化]