端面锥形参数对锥-孔组合型机械密封性能的影响

发布时间：2018-07-12 08:13

本文选题：数值模拟 + 流体动力学　；参考：《化工学报》2016年11期

【摘要】：给出新型锥-孔组合型端面密封,考虑液膜压场的变化规律与环受力变形的相互作用关系,构建机械密封3D流、固耦合数学模型,并给出相关的数值计算方法,获得了膜压分布规律及端面变形情况,分析锥面结构参数在各工况下对密封性能的影响规律。结果表明:由菱形孔所引起的动压效应可使端面产生周向和径向波状变形,而静压效应随锥度Ф和锥宽比γ的变化,在端面区域范围内所起作用也发生相应变化;对压强较低和低、中转速设备,应选取Ф=5~6或Ф=2~4的收敛锥面密封,且γ=0.8~1.0。对高压和高速设备,应选用Ф=2~3的收敛锥面密封,且γ=1.0或γ=0.2;通过改变锥面结构可有效改变机械密封的特性参数,实现密封运行中的自动调节,特别适合变工况条件。另外,由于锥面结构的变化所引起平衡系数B和膜厚h的变化,低速时可弥补动压效应较小的缺陷,获得较大开启力,也可在大h下工作,故可降低密封端面对平整度和光洁度的要求。
[Abstract]:In this paper, a new type of cone-hole combined end seal is presented. Considering the interaction between the pressure field of the liquid film and the deformation of the ring, the 3D flow and solid coupling mathematical model of the mechanical seal is constructed, and the relevant numerical calculation method is given. The distribution of membrane pressure and the deformation of the end face were obtained, and the influence of the conical structure parameters on the sealing performance was analyzed. The results show that the dynamic pressure effect caused by the diamond hole can cause the wave deformation of the end face in the circumferential and radial direction, and the static pressure effect changes with the change of taper and the ratio of cone to width 纬, and the effect of the static pressure also changes in the range of the end face. For the equipment with low pressure, low and medium rotational speed, the convergent conical seal of Yi-5U 6 or Yi-2J 4 should be selected, and the 纬 -ray is 0.80.0.0.The result shows that the seal is suitable for the equipment with low pressure, low pressure and middle speed. For the high pressure and high speed equipment, the convergent cone seal of Yi-2D3 should be selected, and 纬 1. 0 or 纬-0. 2. By changing the conical structure, the characteristic parameters of the mechanical seal can be changed effectively, and the automatic adjustment in the operation of the seal can be realized, which is especially suitable for the condition of variable working conditions. In addition, due to the variation of the balance coefficient B and the film thickness h caused by the change of the conical structure, the defects of less dynamic pressure effect can be remedied at low speed, and a large opening force can be obtained, which can also work at a large hour. Therefore, it can reduce the requirements of face smoothness and finish at the end of the seal.
【作者单位】：江西省科学院应用物理研究所;浙江工业大学过程装备及其再制造教育部工程研究中心;
【基金】：国家自然科学基金青年项目(51505203);国家自然科学基金面上项目(51375449) 江西省科技开发和产业化开发项目(20151BBE51065) 2015年江西省科学院博士启动基金项目(2014-YYB-18,2014-XTPH1-18)~~
【分类号】：TH136

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