摘要
插装阀在静止状态下,由于静摩擦的原因,导致阀芯与阀套出现卡滞现象;在运动状态下,由于压差和阀芯微偏移的原因造成阀芯与阀套发生磨损;为此提出一种新型的带有导流槽的插装阀阀芯。基于缝隙流动和液压卡紧分析,建立插装阀阀芯与阀套间隙的CFD优化仿真模型,通过N-S方程、伯努利方程和卡紧力方程联立得到阀芯与阀套间卡紧力的推导公式。基于CFD仿真模拟分析,比较新型阀芯与原阀芯不同模型间隙的切线应力、压力分布规律,结果表明:在入口压力为12 MPa时,原阀芯的切线应力在12000 Pa上下波动,大于新型阀芯切线应力4200 Pa;在入口压力为8 MPa时,原阀芯的切线应力在7200 Pa上下波动,大于新型阀芯切线应力3000 Pa;且原阀芯切线应力的波动范围远大于新型阀芯。新型阀芯在阀套间的受力更加平稳,磨损更小。研究结果为插装阀优化以及减少能量损失和改善润滑条件提供理论指导和依据。
When the cartridge valve was at rest,the valve core and valve sleeve were stuck due to static friction.In the moving state,the valve core and valve sleeve worn out due to the valve core’s differential pressure and micro offset.Therefore,a cartridge valve spool with a guide slot was proposed.A CFD optimization simulation model of the cartridge valve spool and sleeve clearance was established based on the gap flow and hydraulic clamping analysis.The N-S equation,Bernoulli equation,and clamping force equation were combined to obtain the derivation of the clamping force between the spool and the sleeve.Based on CFD simulation and analysis,the shear stress and pressure distribution patterns of different model gaps were compared before and after the change.The corresponding clamping force was inferred from the tangential pressure distribution of the gap.The results compared the shear stress and pressure distribution between the new spool and the original spool.The results showed that the shear stress of the original spool fluctuated around 12000 Pa at an inlet pressure of 12 MPa,which was larger than the shear stress of the new spool of 4200 Pa.The shear stress of the original spool fluctuated around 7200 Pa at an inlet pressure of 8 MPa,which was greater than the shear stress of the new spool by 3000 Pa.Furthermore,the fluctuation range of the original spool was much larger than that of the new spool.The new spool in the valve sleeve between the applied force was smoother and had lesser wear.The study results provide theoretical guidance and basis for cartridge valve optimization,as well as reducing energy loss and improving lubrication conditions.
作者
王欲进
潘思意
Wang Yujin;Pan Siyi(Taiyuan University,Taiyuan,030032,China;Taiyuan University of Science and Technology,Taiyuan,030024,China)
出处
《中国农机化学报》
北大核心
2021年第12期137-143,共7页
Journal of Chinese Agricultural Mechanization
基金
山西省重点研发计划(201903D121041)
山西省高等学校优秀成果培育项目(2020KJ019)
山西省高等学校优秀青年学术带头人支持计划(20191044)
山西省“1331”项目(2020—44)。
关键词
插装阀
卡紧力
切线应力
间隙压力
CFD
cartridge valve
clamping force
shear stress
gap pressure
CFD
