垂直管线型先导式截止阀的阀芯运动过程数值分析  

Transient simulation of valve core movement of pilot-control globe valve in vertical pipelines

作　　者：钱锦远[1] 朱银法[2] 刘步展 卢安乐[3] 金志江[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]丽水学院工学院,浙江丽水323000 [3]上海核工程研究设计院,上海200233

出　　处：《排灌机械工程学报》2016年第1期51-56,65,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：浙江省重大科技专项(2012C11018-1);浙江省重点科技创新团队项目(2011R50005)

摘　　要：提出了一种新型的可适用于垂直管线的先导式截止阀,其驱动能耗较低;通过分析阀芯的受力情况,建立了阀芯运动的控制方程;运用Fluent软件及用户自定义函数功能UDF对该阀在不同弹簧刚度下的运动过程中的冲击速度、阀芯稳定位移和瞬态位移进行了数值分析.结果表明:阀芯运动在不同的弹簧刚度下具有不同的开启方式,选取较小的弹簧刚度有助于阀门的快速响应,也能够保证阀门开启后的正常工作,但容易造成开启时候阀芯对阀芯顶盖的冲击碰撞;而随弹簧刚度增大,阀芯的稳定位移逐渐减小,如在转换点之后继续增大弹簧刚度将使得阀芯无法达到最大位移.此外,通过对0.9倍和1.1倍弹簧刚度理论计算值下的阀门开启过程进行瞬态模拟,发现数值模拟与理论计算可以相互印证,同时建议在实际弹簧刚度选取时,选取0.9倍的理论计算值作为实际设计点.研究可为该类先导式截止阀或类似结构截止阀的研究推广与应用提供一定的借鉴意义.A novel pilot-control globe valve,which can be used in vertical pipelines with a lower driving energy consumption,is proposed. A governing equation for valve core motion is obtained through a theoretical analysis of the forces applied on the valve core. A 3D simulation of valve core motion is conducted in Fluent by using User Defined Function（ UDF） to involve different spring stiffness,steady state displacements,impact speeds and transient state displacements. The results show that there are different opening modes for different spring stiffness. For smaller spring stiffness,the valve is subject to a quicker response to flow to ensure it can work properly; however,this can more easily result in ahigher impact speed. With the increasing of spring stiffness,the steady displacement of the core reduces especially beyond a turning point. Besides,the numerical transient displacements with 0. 9 and1. 1 times the spring stiffness show good agreement with those obtained from a theoretical analysis. It is found out that the real spring design point should have 0. 9 times the spring stiffness determined by the theoretical analysis. This paper provides a reference for designing and application of pilot-control globe valves or other valves with similar structures.

关 键 词：先导式截止阀 阀芯运动 垂直管线 弹簧刚度 瞬态模拟 

分 类 号：S277.9[农业科学—农业水土工程] TQ055.8[农业科学—农业工程]