本文選題：直線深槽　切入點(diǎn)：流體動(dòng)壓效應(yīng)　出處：《浙江工業(yè)大學(xué)》2013年碩士論文

【摘要】：近期,國(guó)家為了治理環(huán)境污染、碳排放問(wèn)題,提出了發(fā)展核電宏偉計(jì)劃。在核電站中,核主泵用機(jī)械密封對(duì)核電安全生產(chǎn)起到重要的作用,而我國(guó)對(duì)這種機(jī)械密封不能夠自主生產(chǎn),且受到國(guó)外相關(guān)技術(shù)的封鎖,因此嚴(yán)重影響了我國(guó)的核電發(fā)展計(jì)劃和我國(guó)核電運(yùn)行的整體安全性。本課題以國(guó)家“十二五”科技支撐計(jì)劃為依托,在自主設(shè)計(jì)的核主泵用試驗(yàn)臺(tái)和機(jī)械密封的基礎(chǔ)上,對(duì)全尺寸的核主泵用鑲嵌式直線深槽流體動(dòng)壓型機(jī)械密封(簡(jiǎn)稱(chēng)為MSL-MS)進(jìn)行理論和試驗(yàn)的相關(guān)研究。 核主泵用機(jī)械密封使用工況為高壓、高溫等苛刻條件,密封端面的壓力變形對(duì)密封性能有較大影響。通過(guò)建立優(yōu)化后的MSL-MS流、固耦合模型,研究密封性能的變化規(guī)律,并對(duì)所設(shè)計(jì)的單級(jí)MSL-MS進(jìn)行了試驗(yàn)研究,主要研究?jī)?nèi)容和結(jié)論如下： 1)考慮潤(rùn)滑液膜空化和鑲嵌配合等因素,采用有限元商業(yè)軟件和自編有限差分程序,實(shí)現(xiàn)有限元軟件和編寫(xiě)程序求得相關(guān)數(shù)據(jù)的相互調(diào)用,建立了完整的流、固耦合模型,分別求解密封環(huán)的變形方程和液膜的壓力控制方程,為后期數(shù)值模擬仿真奠定了基礎(chǔ)。 2)基于已建立的流、固耦合模型,研究了操作參數(shù)對(duì)密封性能的影響規(guī)律。結(jié)果表明,泄漏率隨著壓力的升高而增大,而摩擦系數(shù)隨著壓力的升高而減小。 3)研究了密封環(huán)組件和端面直線深槽的幾何結(jié)構(gòu)參數(shù)對(duì)端面變形和密封性能的影響。研究發(fā)現(xiàn),影響端面錐度和波度幾何尺寸的結(jié)構(gòu)參數(shù)是相互獨(dú)立的,即靜環(huán)外徑、靜環(huán)輔助O型圈的位置、密封環(huán)鑲嵌過(guò)盈量以及端面槽臺(tái)比等參數(shù)是影響端面錐度的主要因素,而直線深槽的槽數(shù)和槽徑比則主要影響端面的波度；給出了鑲嵌環(huán)配合公差的推薦值,并建議為保持優(yōu)良密封性端面槽數(shù)宜選為8-12個(gè),槽徑比不宜小于0.9553。 4)采用核主泵單級(jí)密封試驗(yàn)臺(tái),對(duì)MSL-MS分別進(jìn)行靜壓試驗(yàn)、磨合前運(yùn)轉(zhuǎn)試驗(yàn)以及磨合后的運(yùn)轉(zhuǎn)試驗(yàn),研究了操作參數(shù)變化對(duì)密封性能的影響,分析了運(yùn)轉(zhuǎn)后密封環(huán)的表面形貌。靜壓試驗(yàn)表明,泄漏率隨著壓力的升高而不斷減小,磨合前后的動(dòng)壓試驗(yàn)表明,泄漏率隨著壓力的升高均是先增大后減小。 本文通過(guò)理論和試驗(yàn)研究了MSL-MS的密封性能,初步掌握了高參數(shù)下深槽機(jī)械密封的設(shè)計(jì)方法,為以后開(kāi)發(fā)核主泵用深槽機(jī)械密封的深度開(kāi)發(fā)奠定了理論和試驗(yàn)基礎(chǔ)。
[Abstract]:Recently, in order to control environmental pollution and carbon emissions, the state put forward a grand plan to develop nuclear power.In the nuclear power plant, the mechanical seal of the nuclear main pump plays an important role in the safe production of nuclear power, but the mechanical seal of our country cannot be produced independently, and is blocked by the relevant technology of foreign countries.Therefore, the nuclear power development plan and the overall safety of nuclear power operation in China are seriously affected.This subject is based on the national "12th Five-Year Plan" science and technology support plan, on the basis of the independently designed test bed and mechanical seal for the nuclear main pump.The theoretical and experimental research on the inlaid linear deep groove hydrodynamic mechanical seal (MSL-MSM) for the nuclear main pump is carried out in this paper.The working condition of mechanical seal for nuclear main pump is high pressure, high temperature and so on. The pressure deformation of seal face has great influence on sealing performance.Through the establishment of optimized MSL-MS flow and solid coupling model, the variation of seal performance is studied, and the experimental study of the single stage MSL-MS is carried out. The main research contents and conclusions are as follows:1) considering the factors of lubricating film cavitation and mosaic, the commercial finite element software and the finite difference program are used to realize the mutual transfer of the relevant data between the finite element software and the program, and a complete flow and solid coupling model is established.The deformation equations of the seal ring and the pressure control equations of the liquid film are solved respectively, which lays a foundation for the later numerical simulation.2) based on the established flow and solid coupling model, the effect of operation parameters on sealing performance is studied.The results show that the leakage rate increases with the increase of pressure and the friction coefficient decreases with the increase of pressure.3) the effect of geometric structure parameters of seal ring assembly and end face straight deep groove on the end face deformation and sealing performance is studied.It is found that the structural parameters that affect the geometric dimensions of the end taper and wavenumber are independent of each other, namely, the outer diameter of the static ring, the position of the auxiliary O-ring of the static ring,The inlay interference of seal ring and the ratio of the end face to the groove are the main factors affecting the taper of the end face, while the number of slots and the ratio of the groove to the diameter of the straight line deep groove mainly affect the waveness of the end face, and the recommended value of the tolerance of the inlaid ring matching is given.It is suggested that the number of slots should be chosen as 8-12 and the ratio of groove diameter should not be less than 0.9553in order to maintain good sealing performance.4) the static pressure test, running-in test and running-in test were carried out on the nuclear main pump single-stage sealing test rig. The influence of the operation parameters on the seal performance was studied, and the surface morphology of the seal ring after operation was analyzed.The static pressure test shows that the leakage rate decreases with the increase of pressure, and the dynamic pressure test before and after running-in shows that the leakage rate increases first and then decreases with the increase of pressure.In this paper, the sealing performance of MSL-MS is studied theoretically and experimentally, and the design method of deep groove mechanical seal under high parameters is preliminarily mastered, which lays a theoretical and experimental foundation for the further development of deep groove mechanical seal for nuclear main pump.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TH136

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