摘要
介绍了新型水压比例节流阀的结构及特点,建立了水压比例节流阀的滑阀流量-压力方程。通过利用MATLAB/SIMULINK软件对滑阀的流量特性、压力特性和流量-压力特性仿真分析,得到了负载快进与工进时的阀芯位移范围。分析表明:在稳态情况下,负载流量与阀芯位移之间为线性关系,且负载快进时滑阀对负载流量的控制比负载工进时灵敏;当通过节流阀口的流量不变时,阀芯位移越大,滑阀的压力放大系数越小;当阀芯位移一定时,负载压降越大,通过负载的流量越小;而当负载压降一定时,阀芯位移越大,通过负载的流量越大;阀口开度越小,阀的流量-压力系数越小,阀的刚度越大,反之,阀口开度越大,阀的流量-压力系数越大,阀的刚度越小。
The structure and feature of new-type water hydraulic proportional throttle valve was introduced, and the flow-pressure equation of slide valve was established. Based on emulation analysis on flow characteristic, pressure characteristic and flow-pressure characteristic of slide valve with software MATLAB/SIMULINK, the range of spool displacement was obtained when load moves at rapid speed and working speed. The analysis shows that there is a linear relationship between flow of load and displacement of spool under steady-state condition, and slide valve controls flow of load more acutely when load moves at rapid speed than at working speed. When the flow passing through valve port is constant, the bigger the spool displacement is, the smaller the pressure amplification coefficient is. When spool displacement is constant, the larger the pressure loss of load is, the less the flow through load is. When the pressure loss of load is steady, the bigger the spool displacement is, the more the flow through load is. The smaller the opening of valve notch is, the smaller the flow-pressure coefficient of valve is, the bigger the rigidity of valve is. On the contrary, the bigger the opening of valve notch is, the bigger flow-pressure coefficient is, the smaller the rigidity is.
出处
《机床与液压》
北大核心
2008年第12期64-66,83,共4页
Machine Tool & Hydraulics
基金
国家自然科学基金资助项目(50675003)
北京市自然科学基金资助项目(3072006)
北京市教委科技发展资助项目(KM200710005012)
关键词
水压
比例节流阀
滑阀
静态特性
仿真分析
Water hydraulic
Proportional throttle valve
Slide valve
Static-state characteristic
Emulation analysis
