核主泵用流体静压型机械密封多场耦合模型与性能分析

发布时间：2018-03-14 00:06

本文选题：核主泵　切入点：流体静压型机械密封　出处：《浙江工业大学》2011年硕士论文　论文类型：学位论文

【摘要】：端面开收敛锥度的流体静压型机械密封是核主泵主轴密封的一种典型密封型式,其稳定性和可靠性严重影响了主泵的长周期安全稳定运行,设计难度较高。目前国外此类产品的相关技术已十分成熟,而我国尚不具备其设计加工能力。由于密封组件在超高压工况下运行,密封端面的热力耦合变形和流体静压润滑作用对密封性能的具有重要的影响作用；且组件之问的非线性接触问题的存在,使得密封环端面的变形分析变得相对困难。针对此问题,论文开展了如下几方面的研究,以期为此类流体静压型机械密封的设计提供技术指导：首先,考虑密封环组件(密封环、密封环座、夹紧环、辅助O型圈等)之间的非线性接触作用,采用商业有限元软件建立了动、静密封环组件的有限元轴对称分析模型,得到了不同密封压力下动、静密封环在复杂作用关系综合影响下的非线性位移约束边界条件,为后续准确预测密封性能奠定了基础。其次,以密封动静环和流体润滑膜为研究对象,考虑润滑液膜的粘温粘压效应和密封端面的热力变形,建立了二维轴对称流固热力多场耦合模型,引入上述位移约束边界条件,采用迭代算法交叉运用有限差分法和有限单元法分别求解润滑方程、能量方程、热传导方程和变形方程等控制方程。最后,基于所建立的流固热多场耦合模型,对密封性能进行了参数化研究,分析了密封环底边辅助0型密封圈位置、螺钉力、平衡比、端面锥角结构、密封压力等对密封性能的影响。结果表明,位移约束边界条件对密封性能有显著影响；液膜与密封环端面粘性剪切产生的热量主要由泄漏液体带走,压力变形较热变形对端面变形影响更大；对螺栓力、主要几何参数以及操作压力对密封性能的影响进行了分析,得到的结论对机械密封结构设计具有指导意义。
[Abstract]:Hydrostatic pressure mechanical seal with open and convergent taper on the end face is a typical sealing type of nuclear main pump spindle seal. Its stability and reliability seriously affect the long period safe and stable operation of the main pump. The design difficulty is high. At present, the relevant technology of this kind of products abroad has been very mature, but our country still does not have its design and processing ability. The thermo-mechanical coupling deformation and hydrostatic lubrication of the seal end face have an important effect on the seal performance, and the nonlinear contact problem among the components exists. It is relatively difficult to analyze the deformation of the end face of the seal ring. In order to provide technical guidance for the design of the hydrostatic mechanical seal, this paper has carried out the following research:. Firstly, considering the nonlinear contact between seal ring assembly (seal ring, seal ring seat, clamping ring, auxiliary O-ring, etc.), a finite element axisymmetric analysis model of dynamic and static seal ring assembly is established by commercial finite element software. The nonlinear displacement-constrained boundary conditions of dynamic and static seal rings under different sealing pressures are obtained under the influence of complex action relationships, which lays a foundation for accurate prediction of sealing performance. Secondly, taking the sealed dynamic and static ring and the fluid lubrication film as the research object, considering the visco-temperature visco-pressure effect of the lubricating liquid film and the thermal deformation of the seal end surface, a two-dimensional multi-field coupling model of axially symmetric solid and thermodynamics is established. By introducing the above displacement-constrained boundary conditions, the governing equations such as lubrication equation, energy equation, heat conduction equation and deformation equation are solved by the iterative algorithm and the finite difference method and finite element method, respectively. Finally, based on the multi-field coupling model of fluid-solids and heat, the sealing performance is parameterized, and the position, screw force, balance ratio, end cone angle structure of the auxiliary 0-type sealing ring at the bottom edge of the seal ring are analyzed. The results show that the displacement constrained boundary condition has a significant effect on the sealing performance, and the heat produced by viscous shear of the liquid film and the end surface of the seal ring is mainly taken away by the leaking liquid. The effect of pressure deformation on end face deformation is greater than that of hot deformation, and the effects of bolt force, main geometric parameters and operating pressure on seal performance are analyzed, and the conclusions are of guiding significance to the design of mechanical seal structure.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

【参考文献】