共查询到20条相似文献，搜索用时 62 毫秒
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<正>机械密封在旋转设备上的应用非常广泛,机械密封的密封效果将直接影响整机的运行,严重的还将出现重大安全事故。一、机械密封的原理及要求机械密封是一种旋转机械的轴封装置,指由至少一对垂直于旋转轴线的端面在液体压力和补偿机构弹力(或磁力) 相似文献
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水泵机械密封的渗漏原因及解决办法 总被引：1，自引：0，他引：1
为了保证机械密封长期可靠地运转,在使用机械密封时,应分析使用机械密封的各种因素,使机械密封适用于各种泵的技术要求和使用介质要求,并且有充分的润滑条件.机械密封的可靠性和寿命不仅取决于运行工况和工作环境,从某种意义上还取决于对故障的准确判断和排除.本文总结了机械密封比较常见的渗漏原因,并提出了解决问题的具体措施. 相似文献
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冯晓敏 《中国教育技术装备》2011,(25)
1概述随着环境保护意识和人类健康要求的提高,对机器的防泄漏要求也不断提高。由于机械密封泄漏量很小,密封可靠,因此自1885年英国产生第一台机械密封装置以来,机械密封就被广泛应用于化工、石化和医药工业中。目前70%～80%的工业用泵均配备了机械密封。 相似文献
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刘建萍 《牡丹江教育学院学报》2007,(6):147-148
在低温工况下,由于材料的限制,普通的机械密封不能满足生产要求,往往采用波纹管机械密封.实践证明,波纹管机械密封以其良好的性能在低温和超低温的工况下可以良好运行. 相似文献
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《兰州石化职业技术学院学报》2019,(4)
P-8155水泵在运行过程中出现机械密封泄漏问题,导致该泵转子等部件腐蚀,通过分析机械密封失效的原因,对机械密封进行改造,实现了稳定长周期运行。 相似文献
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在化工反应装置中泵的密封泄漏是引起密封失效的主要原因。引起机械密封泄漏过早失效的因素很多，如：选型和安装问题、密封设计和制造问题以及设备本身存在的问题等． 相似文献
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彭立煌 《合肥联合大学学报》2005,15(3):64-66
针对进口糊树脂单体泵在特定使用工况条件下所造成的机械密封失效进行分析，提出了机械密封的改造方案，改进了弹簧的形式并采用浮装结构，解决了机械密封的短期失效问题。 相似文献
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《实验技术与管理》2016,(2)
为研究和掌握机械密封端面的摩擦特性,理论上分析了其摩擦特性参数,通过摩擦磨损实验得到了这些参数的变化规律,并建立了磨损率的时间相关模型。研究表明:工作在70℃、N32液压油下、转速为3 000r/min、端面比载荷为0.558 44~1.675 32 MPa的机械密封处于混合摩擦状态;摩擦特性参数具有载荷相关性和时间相关性;摩擦力矩及摩擦系数随载荷增大而增大,随时间增加而减小;磨损率随载荷增大而增大,随时间呈指数下降趋势,实验条件下密封端面的预测寿命为191.5~464.8d。该研究有利于拓展机械密封摩擦机理的研究途径,为机械密封寿命预测提供一定思路。 相似文献
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针对橡胶装置GA5201搅拌器机械密封寿命短的问题,从机械密封的材料、设计、运转情况等几个方面进行了具体的分析,找出了导致机械密封泄漏的主要原因,提出并采取了相应的改进措施,从根本上解决了机封泄漏问题,从而保证了设备的长周期运行,节约成本,减少环境的污染。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献