近阻塞状态时液压阻尼孔流动与压力-流量特性分析  

Analysis of Hydraulic Damping Hole Flow and Pressure-Flow Characteristics in Sub-Blocking State

作　　者：葛忠栋 刘飞 刘新强[2] 李坤义 GE Zhong-dong;LIU Fei;LIU Xin-qiang;LI Kun-yi(Electromechanical Division,Gansu Academy of Mechanical Sciences Co.,Ltd,Lanzhou Gansu 730030,China;School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China)

机构地区：[1]甘肃省机械科学研究院有限责任公司,甘肃兰州730030 [2]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《机械研究与应用》2021年第3期63-66,共4页Mechanical Research & Application

基　　金：国家重点研发计划项目:青贮缠网裹膜与秸秆压缩成型技术及装备研发(编号:2016YFD0701305);兰州市十大科技创新项目:饲草精制高密度压缩成型装备的研发与产业化(编号:2018-4-16)。

摘　　要：针对草捆成型液压系统中的插装阀阻尼孔阻塞问题,建立一种近阻塞状态时阻尼孔计算模型,提出阻塞裕度的概念,分析了近阻塞状态液压阻尼孔的流动及压力-流量特性。结果表明近阻塞状态时,阻塞物在入口形成“二次节流”效应,加剧了流速的变化,造成高压力梯度区的前移和低压区的扩大。阻尼孔通流能力随着压差的增大和堵塞裕度的降低而加剧。所推导的理论流量公式在阻塞裕度较小时与数值计算结果吻合良好。研究结果对阻尼孔性能退化的评估提供了参考。Aiming at the problem of blocking failure of the two-way cartridge valve with damping hole in the bale forming hydraulic system,a hydraulic damping hole calculation model and blocking margin is proposed in the sub-blocking state.The flow and pressure-flow characteristics of the hydraulic damping hole in the sub-blocked state are analyzed.The results show that the"secondary throttling"effect is formed at the inlet by the blocking object in the sub-blocking state,which intensifies the change of the blocking flow rate and causes the forward movement of the high pressure gradient zone and the expansion of the low pressure zone.The flow capacity of the damping hole decreases seriously with the increase of the pressure differential and the decrease of blocking margin.The theoretical flow formula is in good agreement with the numerical calculation results when the blocking margin is small.This study provides reference for evaluation of the performance degradation of hydraulic damping hole.

关 键 词：阻尼孔 近阻塞 流动 压力-流量特性 数值预测 

分 类 号：TH131[机械工程—机械制造及自动化]