电厂外供泵轴断裂原因分析

某外供泵在运行期间其泵轴发生断裂。通过宏观和微观检验、化学成分分析以及硬度测试等方法对泵轴断裂的原因进行了分析。结果表明:该轴的热处理没有达到要求,使各项强度指标显著降低,加上在应力集中部位键槽根部产生了疲劳裂纹,并进一步扩展,最终导致泵轴断裂。     

分子泵的世纪回顾与展望

分子泵自1912年诞生以来,至今已快近一个世纪了,它在初期进展较缓慢,在1970年以前,分子泵的应用还仅限于核物理,电真空,表面科学等领域,但近20年来由于半导体产业的兴起和薄膜工业的发展,分子泵才被人们所重视,并得到了兴旺和发达,现代的分子泵已发展到实用和普及的阶段,本文回顾了分子泵分析近百年的发展历史,详细地介绍了分子泵在各个时期的发展状况,对初期的分子泵,涡轮分子泵,磁悬浮轴承和气体静压静轴式涡轮分子泵,复合式分子泵,低温型涡轮分子泵,新型牵引分子泵,陶瓷涡轮分子泵,轴反应生成物的涡轮分子泵和极高真空涡分子泵等做了重点的分析,最后指出分子泵的发展前景。     

酸性水原料泵泵轴断裂原因分析及对策

本文对酸性水原料泵泵轴断裂问题进行了分析,查找原因,提出对策。     

进料泵传动轴断裂分析

采用显微组织分析、扫描电镜分析和拉伸试验等方法对进料泵传动轴的断裂进行了失效分析。结果表明,泵轴断裂属疲劳失效,轴中段键槽处在制造过程中存在淬火裂纹是导致疲劳断裂的主要原因。     

基于有限元法的泵轴强度分析

本文首先泵轴进行三维建模,然后调用有限元计算软件ANSYS中相关的模块,通过有限元前分析,进行零件的有限元数值分析建模,确定泵轴特殊的控制方程和边界条件,根据受力状况,得到了在静力状况下它的主应力分布,根据第三和第四强度理论对其进行了校核计算,结果表明满足强度要求,为泵轴的设计及制造工艺提供了有益参考。     

火电机组给水前置泵轴断裂原因分析

某火电厂4号机组B给水前置泵轴投运仅19h即发生断裂。经对断裂泵轴进行宏观分析、化学成分分析、常温力学性能测试、金相检验及断口扫描电镜分析,探讨并明确了泵轴断裂原因,同时提出了防范措施。结果表明：该给水前置泵轴断裂为疲劳断裂,在弯曲及扭转载荷作用下于变截面的应力集中部位的不连续及夹杂物处形成疲劳裂纹,同时大量夹杂物及沿晶分布的粗大a铁素体的存在严重降低了基体强度,使轴体所能承受的循环应力大大降低,即在较低的循环应力作用下疲劳裂纹不断扩展并最终断裂。     

316L不锈钢泵轴断裂原因分析

316L不锈钢泵轴在安装运行3个月左右发生断裂。采用光学显微镜、扫描电镜、X荧光光谱仪等检测手段,对该轴的断裂原因进行了分析。结果表明:奥氏体基体上存在着大量沿晶界分布的δ第二脆性相,是导致泵轴疲劳脆性断裂的主要原因。     

短叶片涡轮分子泵—一种复合分子泵

本文分析了涡轮分子泵和拖动分子泵抽气机理的不同物理图象，并论证了短叶片涡轮分子泵的抽气作用是这二种分子泵抽气机理同时作用的结果，从而，这种泵具有涡轮分子泵和拖动分子泵的共同优点。     

园弧型齿轮氨泵

齿轮氨泵是冷库必备的机组。它将低压贮液桶内的氨液送到冷库内各层蒸发器中,使氨液在蒸发器内蒸发吸热,连续致冷。其工作温度为-10～-40℃。容积式渐开线齿轮氨泵由泵体、左右泵盖、主动齿轮、主动轴、从动齿轮、从动轴、轴封装置和安全回放阀等组成。氨泵主轴功率由电动机通过联轴器输入,泵体两边装有管螺纹     

致冷机冷冻泵轴断裂失效分析

通过金相分析、断口观察以及力学性能测定等,对致冷机冷冻泵轴断裂失效进行了分析.结果表明,断裂的内因是材料冶金质量低劣,显微夹杂物含量很高,热加工工艺不完善,致使组织均匀性差;外因是泵轴加工质量极差,键槽无圆角过渡,槽面加工刀痕明显引发极大的应力集中.     

28000m~3/h空分设备配套引进设备运行情况总结

介绍兖矿鲁南化肥厂28000 m3/h空分设备配套的进口液氧泵、液氮泵和透平膨胀机等引进设备的设计参数,分析在运行过程中出现的液氧泵电机烧坏、液氮泵汽蚀、液氮泵迷宫损坏和透平膨胀机轴振动值波动频繁等问题,叙述了处理问题的方法和措施。     

给水泵轴横向裂纹分析

某厂生产的给水泵轴在车削加工过程中发现轴中央部位有一条横向裂纹。采用化学成分分析、金相检验和断口分析等方法对裂纹产生的原因进行了分析。结果表明:该裂纹为锻造裂纹,锻造温度偏高可能是引起裂纹的重要原因。     

离心泵建模和装配过程演示

根据离心泵结构图,利用UGNX软件对一个离心泵进行三维造型,分别建立了叶轮、前后泵盖、泵壳、支架、泵轴、密封组件等零件的实体模型,并对零件进行了装配．对离心泵装配过程进行了动画演示,并配以语音讲解,将离心泵的装配过程直观的体现出来．     

Analysis of a Butane Pump Failure

A refinery fire at a liquid butane pump engulfed the pump, mechanical pump seals, bearing and motor shaft. The principal question to be answered was if the bearing or mechanical seals failed first. Seal failure would likely have resulted in a fume explosion, causing fracture of the shaft. Bearing failure/seizure could have caused the shaft to fracture, damaging the seals in the process, releasing liquid butane that then ignited without a forceful explosion as it contacted hot metal surfaces. The observed distortion and microstructural changes in the bearing and shaft components showed that bearing failure by possible lubrication starvation was the cause of the fire. The bearing lubrication level had been checked 30 min prior to the event, and the plastic lug removed to check the level was never found.     

Failure analysis of a river water circulating pump shaft from a NPP

This paper presents the failure analysis of a river water circulating pump from a Nuclear Power Plant. The failed component was the upper shaft made of martensitic stainless steel. The metallurgical analyses performed include fractography, metallography and energy dispersive spectrometry analysis. Charpy impact, tensile and hardness tests were also performed. The destructive examination carried out revealed that the root cause of the pump shaft failure was an improper thermal treatment of the material that generated a temper embrittlement process. However, in addition, a hydrogen embrittlement process could have contributed to the failure.     

Failure Analysis of a Locomotive Engine Oil Pump Shaft

In this study, the fracture of a locomotive engine oil pump shaft is investigated. According to the reports, all oil pump shafts of this type fail in short periods of time due to the fracture at a location on the shaft which is in contact with a pinion. Stress analysis showed that the shaft bears torsion and cyclic bending stresses in the fracture site. The fracture surface observations revealed that the cracks are generated from the surface, and fatigue fracture occurs due to the cyclic bending stresses. According to the laboratorial analysis, the shaft is a surface-hardened low alloy steel. The lack of suitable pre-heat treatment and surface hardening and the roughness created by the slippage between the shaft and the pinion are concluded to be responsible for the failure of the oil pump shaft.     

循环粗氩泵轴封处漏液故障分析与处理

在24000 m3/h空分设备运行过程中,突然发生循环粗氩泵轴封处异常漏液故障,切换至备用泵运行,不久也出现类似的漏液现象。介绍故障现象及相关参数,详细分析了故障原因和采取的处理,最后提出了工艺设计上的一些建议。     

无拆卸轴承刚度测试方法的研究

轴承刚度对轴系振动有重要影响,研究无拆卸轴承刚度测试方法有利于快速可靠地了解轴系的振动特性。通过机架安装隔振器、泵进出口安装波纹管、电机与泵转子间采用电磁联轴器等结构措施;构建了离心泵转子-滚动轴承的试验台架。以光电传感器安装位置为转轴相位参考,通过转轴振动位移峰值识别出轴承截面轴系等效偏心质量的相位。通过附加质量于等效偏心质量相位产生激振力,并运用Lab VIEW构建的虚拟仪器测量附加质量前、后振动位移峰值变化量,从而得出轴承刚度。最后通过台架实际配置与转子模型进行了验证。结果表明,轴承刚度无拆卸测试方法有效可行,设计的试验台架可实现附加配重的安装,并能够有效地予以验证;所构建的虚拟仪器也能够准确计算得出转轴偏心质量相位与轴承支撑刚度。     

Application of Direct Metal Deposition Process for Failure Prevention of Oil Pump Gear Shaft in an Aero Engine

Journal of Failure Analysis and Prevention - Direct metal deposition process has been adopted for repair of oil pump gear shaft of an aero engine. The process is first optimized for the specific...