本文選題：核主泵　切入點(diǎn)：流體靜壓型機(jī)械密封　出處：《浙江工業(yè)大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：端面開收斂錐度的流體靜壓型機(jī)械密封是核主泵主軸密封的一種典型密封型式,其穩(wěn)定性和可靠性嚴(yán)重影響了主泵的長周期安全穩(wěn)定運(yùn)行,設(shè)計難度較高。目前國外此類產(chǎn)品的相關(guān)技術(shù)已十分成熟,而我國尚不具備其設(shè)計加工能力。由于密封組件在超高壓工況下運(yùn)行,密封端面的熱力耦合變形和流體靜壓潤滑作用對密封性能的具有重要的影響作用；且組件之問的非線性接觸問題的存在,使得密封環(huán)端面的變形分析變得相對困難。針對此問題,論文開展了如下幾方面的研究,以期為此類流體靜壓型機(jī)械密封的設(shè)計提供技術(shù)指導(dǎo)： 首先,考慮密封環(huán)組件(密封環(huán)、密封環(huán)座、夾緊環(huán)、輔助O型圈等)之間的非線性接觸作用,采用商業(yè)有限元軟件建立了動、靜密封環(huán)組件的有限元軸對稱分析模型,得到了不同密封壓力下動、靜密封環(huán)在復(fù)雜作用關(guān)系綜合影響下的非線性位移約束邊界條件,為后續(xù)準(zhǔn)確預(yù)測密封性能奠定了基礎(chǔ)。 其次,以密封動靜環(huán)和流體潤滑膜為研究對象,考慮潤滑液膜的粘溫粘壓效應(yīng)和密封端面的熱力變形,建立了二維軸對稱流固熱力多場耦合模型,引入上述位移約束邊界條件,采用迭代算法交叉運(yùn)用有限差分法和有限單元法分別求解潤滑方程、能量方程、熱傳導(dǎo)方程和變形方程等控制方程。 最后,基于所建立的流固熱多場耦合模型,對密封性能進(jìn)行了參數(shù)化研究,分析了密封環(huán)底邊輔助0型密封圈位置、螺釘力、平衡比、端面錐角結(jié)構(gòu)、密封壓力等對密封性能的影響。結(jié)果表明,位移約束邊界條件對密封性能有顯著影響；液膜與密封環(huán)端面粘性剪切產(chǎn)生的熱量主要由泄漏液體帶走,壓力變形較熱變形對端面變形影響更大；對螺栓力、主要幾何參數(shù)以及操作壓力對密封性能的影響進(jìn)行了分析,得到的結(jié)論對機(jī)械密封結(jié)構(gòu)設(shè)計具有指導(dǎo)意義。
[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.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH136

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