滑阀节流槽阀口的流量控制特性  

Flow Control Characteristic of the Orifice in Spool Valve with Notches

作　　者：冀宏[1] 王东升[1] 刘小平 傅新[3] 

机构地区：[1]兰州理工大学流体动力与控制学院,兰州730050 [2]日本日立建机株式会社技术研究所,茨城3000013 [3]浙江大学流体传动及控制国家重点实验室,杭州310027

出　　处：《农业机械学报》2009年第1期198-202,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(50605030);甘肃省科技攻关计划资助项目(2GS066-A52-002-10)

摘　　要：提出以节流槽内节流面的串并联效应确定二节矩形节流槽阀口面积的原则,推导出阀口面积的计算公式并编制了阀口面积的计算程序;在此基础上对二节矩形节流槽的流量特性进行了试验,试验表明二节矩形节流槽阀口的流量系数是单节矩形槽阀口流量系数的组合,流量系数在阀口开度较小或接近全开时流量系数快速增大,在阀口开度中间区段流量系数较小,在二节节流槽的交界处流量系数增大,流出节流槽方向的流量系数比流入方向约大0.1;提出了反映节流槽阀口流量控制特性的参数阀口流量面积Aq,阀口流量面积为阀口面积和流量系数的耦合函数,与阀口面积及流量系数传统概念相比,阀口流量面积更加合理地表征了阀口几何面积和阀口形状对流量的控制作用。A principle to determine the orifice area of spool valve with two-stage notches was proposed based on the series parallel effects of fluid flowing in channel of the notches. The formulas to calculate the orifice area were obtained and the corresponding computational program was worked out. Then, the experimental results on the flow characteristic of two-stage notches were analyzed. The results show that the flow coefficient of two-stage notch is the combination of that of each single notch. When the spool displacement was small or near to full open, the flow coefficient increased quickly. At the middle part of displacements, the flow coefficient was about 0.7- 0.8. The flow coefficient in flow-out direction was larger than that of flow-in, which was about 0.1. A new concept of orifice area of flow control for defining the flow control function of the orifice was proposed.

关 键 词：滑阀 组合节流槽 阀口面积 流量系数 阀口流量面积 

分 类 号：TH137.52[机械工程—机械制造及自动化]