一种可锁紧的丝杠螺母式直流截止阀
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摘要
截止阀作为主要的截断类阀门之一,在很多领域发挥重要作用。在直流式截止阀中,阀体流道与主流道呈一斜线使得流动状态的破坏程度比常规截止阀要小,但总体上由于阀门开启与关闭时,阀瓣行程较小且流体对阀瓣持续施压,使得通过螺纹启闭阀门所需力矩较大。将旋转升降阀杆结构设计为丝杆螺母式驱动方式,可以较大程度减小直流式截止阀的关闭力矩,并通过与锁紧轴套相配合的零件形成锁紧装置。通过装在阀杆下部的波纹管,隔离流体介质与阀杆,减小温度对密封填料的影响。阀体设置为上阀体和下阀体两部分并与波纹管安装。利用SolidWorks完成丝杠螺母式直流截止阀三维建模并进行强度校核,阀杆受力分析表明关闭力矩减小了53%。通过ANSYS FLUENT进行流体场分析,观察其在不同开度下的压力分布及速度矢量,得到压力、流速特性图。
Stop valves are one of the most important cut-off valves which play an important role in many fields. In the oblique stop valve, the flow path of valve body is in a slash with the main channel that makes the destruction of flow state is smaller than conventional cut-off valve. On the other hand, as the valve discs has shorter stroke and continuous fluid pressure, the required torque through the thread is relatively large when the stop valve is opened or closed. The rotate lift stem structure was designed as ball screw driven mode, which could reduce the closing torque of the cut-off valve to a great extent and the parts coordinated with the locking sleeve formed a locking device. By installing the bellow in the lower part of the stem, the fluid medium could be isolated with valve stem and the effect of temperature on the seal filler could be reduced. The valve body was set to the upper part and the lower part to facilitate the installation of bellow. The three-dimensional modeling of the oblique stop valve driven by ball screw was completed by using SolidWorks and strength check was conducted. The force analysis of the valve stem shows that the closing torque reduces by 53%. The pressure field distribution and velocity vector at different opening degrees were observed by ANSYS FLUENT. The characteristics of pressure and velocity were obtained.
Stop valves are one of the most important cut-off valves which play an important role in many fields. In the oblique stop valve, the flow path of valve body is in a slash with the main channel that makes the destruction of flow state is smaller than conventional cut-off valve. On the other hand, as the valve discs has shorter stroke and continuous fluid pressure, the required torque through the thread is relatively large when the stop valve is opened or closed. The rotate lift stem structure was designed as ball screw driven mode, which could reduce the closing torque of the cut-off valve to a great extent and the parts coordinated with the locking sleeve formed a locking device. By installing the bellow in the lower part of the stem, the fluid medium could be isolated with valve stem and the effect of temperature on the seal filler could be reduced. The valve body was set to the upper part and the lower part to facilitate the installation of bellow. The three-dimensional modeling of the oblique stop valve driven by ball screw was completed by using SolidWorks and strength check was conducted. The force analysis of the valve stem shows that the closing torque reduces by 53%. The pressure field distribution and velocity vector at different opening degrees were observed by ANSYS FLUENT. The characteristics of pressure and velocity were obtained.
引文
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[2] 明友,陈凤官,王勤,等.基于CFD 技术的高压截止阀内流道结构参数的分析[J].阀门,2013(4):28-30.MING Y,CHEN F G,WANG Q,et al.Analysis of the Structural Parameters for the High Pressure Globe Valve Internal Flow Channel Based on CFD Technology[J].Valve,2013(4):28-30.
[3] 巴鹏,闫小楼,欧周华,等.基于CFD 技术的截止阀阻力特性分析[J].机床与液压,2013,41(1):153-156.BA P,YAN X L,OU Z H,et al.Analysis on Resistance Characteristic of Globe Valve Based on CFD Technology[J].Machine Tool & Hydraulics,2013,41(1):153-156.
[4] 陈瑜,魏文鹏,张立祥,等.基于Fluent 的截止阀壳内流道流场分析[J].煤矿机械,2013,34(10):90-91.CHEN Y,WEI W P,ZHANG L X,et al.Flow Distribution Analysis in Break Valve Based on Fluent[J].Coal Mine Machinery,2013,34(10):90-91.
[5] 袁新明,贺治国,毛根海.用RNG κ-ε紊流模型对截止阀三维紊流流动的数值模拟[J].流体机械,2006,34(2):34-38.YUAN X M,HE Z G,MAO G H.Numerical Simulation of a Turbulence Flow in the Cut-off Valve by RNG κ-ε Turbulence Model[J].Fluid Machinery,2006,34(2):34-38.
[6] 张玉祥,杨柳.截止阀的建模与仿真实现[J].流体机械,2007,35(12):29-31.ZHANG Y X,YANG L.Modeling and Simulation Implementation of Stop Valve[J].Fluid Machinery,2007,35(12):29-31.
[7] 高蕾娜,张钰粮,喻洪平,等.一种丝杠螺母驱动式直流截止阀:201720447677.9[P].2017-10-25.
[8] 朱培元.截止阀设计技术及图册[M].北京:机械工业出版社,2015.
[9] 丁欣硕,焦楠.FLUENT 14.5流体仿真计算从入门到精通[M].北京:清华大学出版社,2013.