本文選題：貫流泵機組 + 結(jié)構(gòu)形式�。� 參考：《揚州大學(xué)》2011年碩士論文

【摘要】：大型貫流泵機組在機、電、水等方面均有可能發(fā)生故障,如葉片調(diào)節(jié)機構(gòu)失效、絕緣擊穿和軸承失效等,影響泵機組可靠性。因此,研究和提高貫流泵機組關(guān)鍵部件可靠性有重要意義。本文在“十一五”國家科技支撐計劃重點項目、全國百篇優(yōu)秀博士學(xué)位論文作者專項基金項目等資助下,開展對大型貫流泵機組可靠性的研究。 貫流泵機組系統(tǒng)復(fù)雜,其可靠性主要由關(guān)鍵易磨易損部件的可靠性決定。本文分析比較了貫流泵機組結(jié)構(gòu)形式、支撐受力特性與水力特性,提出了貫流泵機組支撐的設(shè)計原則；研究確定關(guān)鍵部件失效的判斷標(biāo)準(zhǔn)；計算了葉輪進(jìn)口的汽蝕余量并判斷了葉片易汽蝕部位,考慮葉片表面粗糙度、材料的抗汽蝕強度及泵機組年運行時間,求出了葉片最易汽蝕部位基于可靠度的汽蝕壽命；計算了閉式齒輪箱的輪齒磨損模糊可靠度；比較了不同軸承特點,采用指數(shù)分布失效密度函數(shù)計算了單個滾動軸承與軸承系統(tǒng)的可靠度；從起停機特性、可靠性、管理性、經(jīng)濟(jì)運行等方面綜合比較了泵機組的工況調(diào)節(jié)方式,根據(jù)故障樹法計算了液壓葉片調(diào)節(jié)系統(tǒng)的失效概率,求解基于可靠度的液壓調(diào)節(jié)機構(gòu)壽命。 影響貫流泵機組維修性的因素有關(guān)鍵部件安裝檢修步驟、泵機組結(jié)構(gòu),本文分析計算了年運行5000h貫流泵機組的故障及相應(yīng)檢修時間,維修度為95%時,15種貫流泵機組大修時間范圍為148.67h-203.23h,比較了不同貫流泵機組維修性的優(yōu)劣。算例貫流泵機組運行3.25a時的可靠性為90.35%,此時軸承系統(tǒng)的可靠度91.04%,修復(fù)軸承后泵機組的可靠度提高到99.24%；繼續(xù)運行3.25a泵機組可靠性為89.7%,此時軸承系統(tǒng)、葉片調(diào)節(jié)機構(gòu)、齒輪箱、葉片與電機的可靠性分別為91.04%、98.59%、99.92%、100%、100%,再次修復(fù)軸承后泵機組的可靠度提高到98.52%；繼續(xù)使用1.5a,貫流泵機組的可靠性降為90.35%,葉輪運轉(zhuǎn)9年后可靠性會快速降低,因此機組運行8年時需修復(fù)葉輪,修復(fù)軸承系統(tǒng)、齒輪箱與葉片后,泵機組的可靠性提高到98.29%。 為提高貫流泵機組可用度,提出了提高電機與齒輪箱可靠性的措施、選擇泵機組傳動方式、導(dǎo)軸承與推力軸承選用、工況調(diào)節(jié)方式選擇原則。由于軸承易失效,應(yīng)提高其固有可靠性或其結(jié)構(gòu)便于拆裝檢修。確定了導(dǎo)軸承座安裝高程以保證泵機組運行時電機空氣間隙與水泵葉片間隙均勻,控制各部件的安裝要素以提高泵機組整體安裝質(zhì)量。
[Abstract]:The failure of large tubular pump unit in machine, electricity, water and so on may occur, such as the failure of blade regulating mechanism, insulation breakdown and bearing failure, which affects the reliability of pump unit. Therefore, it is of great significance to study and improve the reliability of key components of tubular pump unit. Under the support of the National Science and Technology support Program of the Eleventh Five-Year Plan and the special fund project for the author of 100 outstanding doctoral dissertation, this paper carries out the research on the reliability of the large through-flow pump unit. The system of tubular pump unit is complex, and its reliability is mainly determined by the reliability of the key wearable and vulnerable parts. This paper analyzes and compares the structural form, bearing force characteristic and hydraulic characteristic of the tubular pump unit, puts forward the design principle of the support for the tubular pump unit, studies and determines the criterion of determining the failure of the key components. The cavitation margin at the inlet of the impeller is calculated and the cavitation position of the blade is judged. Considering the surface roughness of the blade, the cavitation strength of the material and the annual operating time of the pump unit, the cavitation life of the most vulnerable cavitation part of the blade based on reliability is obtained. The fuzzy reliability of gear wear of closed gear box is calculated, the characteristics of different bearings are compared, and the reliability of single rolling bearing and bearing system is calculated by using exponential distribution failure density function. According to the fault tree method, the failure probability of hydraulic vane regulating system is calculated, and the life of hydraulic regulating mechanism based on reliability is solved. The factors affecting the maintainability of the tubular pump unit are the steps of installation and maintenance of the key components, the structure of the pump unit, the analysis and calculation of the failure and the corresponding maintenance time of the 5 000 h annual operation of the tubular pump unit. The repair time range of 15 kinds of tubular pump units is 148.67h-203.23h. the maintainability of different tubular pump units is compared. The reliability of the tubular pump unit is 90.35a, and the reliability of the bearing system is 91.0444.The reliability of the pump unit after repairing the bearing is increased to 99.244.The reliability of the pump unit continues to run 3.25a is 89.7. at this time, the bearing system, the vane regulating mechanism, the gearbox, The reliability of the vane and the motor are respectively 91.04, 98.599.59 and 99.92and 100, and the reliability of the pump unit after the bearing repair has been raised to 98.52.The reliability of the tubular pump unit will be reduced to 90.35 after the continuous use of 1.5a, and the reliability of the impeller will decrease rapidly after nine years of operation. Therefore, the reliability of pump unit should be improved to 98.29 after 8 years of operation, such as repairing impeller, repairing bearing system, gearbox and blade. In order to improve the availability of through-flow pump unit, the measures to improve the reliability of motor and gear box are put forward, the driving mode of pump unit, the selection of guide bearing and thrust bearing, and the selection principle of working condition adjustment mode are proposed. Because bearing is easy to fail, its inherent reliability should be improved or its structure can be easily disassembled and overhauled. The installation height of the guide bearing seat is determined to ensure that the air gap between the motor and the pump blade is uniform when the pump unit is running, and the installation elements of each component are controlled to improve the overall installation quality of the pump unit.
【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH38

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