四回路保护阀启闭特性检测系统建模仿真与实验验证

摘要

四回路保护阀(简称四保阀)启闭特性检测系统中,管路孔径、压力数据采集频率对四保阀的开启压力、关闭压力检测结果影响较大,由于目前缺乏相关研究,导致不同检测系统的检测结果无法比对.在研究阀体力学模型及流量特性模型的基础上,构建了四保阀检测的启闭动态过程数学模型,搭建了启闭特性检测系统的AMESim仿真模型并进行了研究.结合实测实验数据,对管路孔径和采样间隔对四保阀启闭检测结果的影响进行了分析.结果表明:进气节流孔越大,开启压力检测时间越短,检测数据稳定性越差;排气管路孔径越大,关闭压力越大;数据采集频率越高,开启压力检测数据稳定性越好;进气节流孔面积为0.5 mm2,采样间隔为0.001 s,可同时兼顾开启压力检测的稳定性和效率.%In the study of open and shut characteristic detection system for four-circuit protection valve,the pipe aperture and pressure acquisition frequency have great influence on the detection result of opening pressure and closing pressure for four-circuit protection valve.There is no relevant research,so it causes that detection results of different detection systems cannot be compared.On the basis of studying mechanical model and flow characteristics model of valve,dynamic process mathematical model and AMESim simulation model of open and shut detection system for four-circuit protection valve were established.Based on the experimental data,the effect of pipe aperture and sampling interval on detection results of open and shut characteristic for four-circuit protection valve was analyzed and verified.Results showed that the greater the intake orifice was,the shorter the opening pressure detection time was,the higher the detection efficiency was,the worse the stability of the data was.The greater the exhaust pipe aperture was,the greater the closing pressure was.The higher the data acquisition frequency was,the better the stability of the data was.When the effective flow area of intake orifice was 0.5 mm2 and the system sampling interval was 0.001 s,it can guarantee the detection stability and efficiency of opening pressure detection.