8／10LRB90B料浆泵的机械密封改造

就8/10LRB90B料浆泵填料密封频繁泄漏的问题,分析指出填料密封被破坏是该泵泄漏的原因,提出了将填料密封改造为外漏式机械密封的改造方案,取得理想效果。     

氨水泵密封装置的改造

针对一台氨水泵在采用填料密封时泄漏严重的问题,对其密封装置进行了改造。将填料密封改为机械密封,并采用填充聚四氟乙烯静环代替石墨静环,解决了氨水泵的泄漏问题,延长了泵的使用寿命。     

填料密封阻塞下气体螺旋密封的数值模拟研究

针对填料密封阻塞下的气体螺旋密封泄漏问题,利用多孔介质概念对填料密封阻塞下的气体螺旋密封做了计算流体力学(CFD)数值模拟,用多孔介质概念来类比填料密封泄漏的机理,建立了相应的计算模型,并分析了该方法的可行性。数值模拟的计算结果表明,在给定的泄漏量条件下,填料密封渗透率分别随着螺旋密封的螺旋角,螺旋结构与壁面间隙及螺旋结构本身的槽深增大而减小,成反比例关系。当螺旋结构的螺旋角,螺旋结构与壁面间隙及螺旋结构本身槽深增大到一定范围时,螺旋密封的效果大大降低,这时填料密封在整个密封装置中起主要的密封作用。该研究结果为填料密封作用下的螺旋密封设计提供了一定的理论基础。     

蜗轮蜗杆减速机密封型式的改进

针对非标准轴径的M20蜗轮蜗杆减速机的填料密封泄漏严重的问题，对泄漏原因进行了分析。将密封改为骨架式橡胶油封后，密封效果良好。     

柱塞式高压注水泵密封失效分析及对策

针对柱塞式高压注水泵填料密封泄漏严重、使用寿命短等问题。通过对其结构特征、密封填料的选择与组装方式、辅助系统等方面进行理论分析、试验研究和改进工作。使密封使用寿命大幅延长，使该泵能长期平稳运行。     

泵填料密封泄漏保护机构

提出一种填料密封泄漏保护方案,解决了传统填料密封当介质泄漏后泄漏介质随旋转的轴套被甩出泵外,既造成现场环境污染,又有可能伤及现场操作人员的问题。     

含油污水泵轴封改造

1.含油污水泵使用状况该泵是随装置建设配套的新机泵,型号为65A Y II-100B,实际流量0～20t/h,介质温度40℃,配用D BM55B-1型波纹管机械密封。使用过程中多次出现机械密封动静环严重损坏和破裂的情况。2.故障原因分析经调查发现,装置的含油污水量不稳定,处于时开时停状态。当水量太少时,泵入口压力过低,会导致机泵发生气蚀。如不及时停泵,将在短时间内造成波纹管机械密封动静环严重损坏。3.改造由于工艺对该泵的密封泄漏量没有要求,且该介质泄漏后对环境也无任何影响,因此,可将波纹管密封改为密封较差的填料轴封。填料轴封在泵内发生气蚀…     

机械密封在氨水泵上的应用

小化肥厂碳化车间氨水泵的泄漏是一个带普遍性的问题。我厂氨水泵的密封原来都用填料密封。这种填料密封不仅泄漏量大,污染严重,而且消耗指标高,要经常检修,劳动强度大。为了使氨水泵的轴封能满足生产要求,最近几年来,在合肥通用机械研究所帮助下,我厂将BA型和GC型二种泵的填料密封改成机械密封,收到了显著效果。这种机械密封泄漏量极少,使用寿命长,一般都在半年以上。机械密封在我厂氨水泵上使用成功以后,得到     

渣浆泵用机械密封

随着工业的发展,用泵来输送各种浆液的情况日益增多,这类泵的密封问题日益引起人们的关注。目前国内渣浆泵大多沿用老式填料密封、不仅泄漏量大、污染严重、功耗很大,而且有的严重影响生产的正常进行。机械密封与填料密封相比,泄漏小,寿命长,能耗低,轴和轴套的磨损小,具有许多优越性。国外已普遍将机械密封应用到各种渣浆泵中。因而,有必要针对我国实际情况,进行渣浆泵用机械密封的研究,提出适宜各种浆液的密封装置。     

高扬程立式长轴泵泵轴密封的设计与探讨

本文对一台扬程高达230 m的立式长轴泵进行水力分析与探讨,在原有结构的基础上经过精确计算,增加了一个减压衬套,使填料密封的泄漏量达到正常水平,成功地解决了高扬程立式长轴泵泵轴密封的问题。同时,对高扬程泵泵轴密封泄漏问题有一定的借鉴作用。     

熔体泵用螺旋密封的优化模型与优化计算

以密封系数最大为优化目标函数，考虑了相对槽深、相对槽宽和螺旋角等约束条件，建立了螺套式螺旋密封封液能力优化的数学模型。采用MATLAB优化工具箱对螺套式螺旋密封的封液能力进行了优化计算，相比于传统的“直接法-变量轮换法”，此方法具有简单易行、计算量小，不依赖于密封操作参数等优点，具有较好的通用性。通过具体实例计算和应用证明了该方法的可行性。     

水轮机主轴密封漏水的故障分析及处理

简述水轮机主轴密封的结构与工作原理,分析主轴密封漏水的原因。通过改造原主轴密封供水管路,提高主轴密封水压力等,解决了主轴密封漏水偏大的问题。改造后的主轴密封运行平稳,漏水量在设计范围之内。     

Analysis of flow field around a ribbed helix lip seal

In this study, a direct numerical simulation model has been developed to elucidate the pumping mechanism of a radial lip seal with helical ribs. The flow field around the contact region between the seal lip and the shaft surface in the environment of a pumping-rate test rig, where both air and oil sides are filled with oil initially, was simulated. The streamline pattern and pressure field around the seal lip were examined. Complicate three-dimensional streamline topology was depicted. On the air side, high pressures built up on the windward faces of ribbed helices next to the lip helping to pump oil back to the sump. The vortex generated next to the lip on the oil side rotates such to create an inward pumping effect too. The pumping rates were calculated at shaft speeds, ranging from 2000 to 6000 rpm, and compared to the measured values from the test rig. Good agreement was observed. Both calculated and measured pumping rates increase as the shaft speed increases. The current results demonstrate the promising application of CFD in the design of radial lip seals.     

Analysis of a hydrodynamic seal with helical grooves

High speed turbogenerators are generally gas cooled and hydrodynamic seals are often used to prevent cooling gas leakage. The seal needs to run essentially at a low eccentricity in order to maintain an uninterrupted oil film all around the shaft. The flow of the oil towards the gas side should be minimized to avoid the contamination of oil with gas.The hydrodynamic seal studied consists of two lands, one on the gas side with helical grooves and the other exposed to ambient air with a wedge. The two lands are separated by a circumferential oil supply groove. The leakage of oil towards the gas side was investigated for different helical groove parameters such as the number of grooves, the helix angle and the groove depth. The effects of these parameters on the performance of the hydrodynamic seal in terms of load support, induced moment, attitude angle, temperature rise and friction force are reported. Equations governing the fluid flow were solved by the finite element method.     

A Wear Study of Polyacrylate Radial Lip Oil Seals

A study was conducted to determine the effect of the number of lobes and lobe height on out-of-round shafts, shaft speed, seal lip load, and fluid temperature on the lip wear characteristics of polyacrylate radial lip seals. Seals molded from four compounds formulated with and without graphite in both plain and helical lip configurations were investigated by means of a fractional factorial experiment. Results of the study show lip load, shaft lobe height, and number of lobes to be significant at the I percent level while shaft speed and fluid temperature are significant at the 5 percent level. The addition of graphite and lip design had no significant effect. An analysis of the results suggests that the seals were operating hydrodynamically.     

旋转轴唇形密封的可持续设计研究

调研和确定旋转轴唇形密封的可持续标准,根据旋转轴唇形密封的具体结构和生产工艺,基于全生命周期评估（LCA）方法,通过定量和定性相结合的方法,计算和分析旋转轴唇形密封生命周期各阶段的能耗、碳排放、单位生产时间、成本等环境、社会和经济可持续指标,确定旋转轴唇形密封可持续改进策略：环境可持续侧重于使用阶段的能耗降低,社会可持续关注生产工艺创新,经济可持续聚焦于延寿设计。从延长使用寿命和优化运行时的摩擦状态2个方面,实施旋转轴唇形密封的可持续改进设计,分析宏观截面形状和尺寸、唇部的微观相貌、唇部材料对旋转轴唇形密封可持续性能的影响。结果表明：薄唇、微观织构和耐磨材料对降低旋转轴唇形密封的能耗和碳排放都具有积极作用,研究结果对提高旋转轴唇形密封的可持续性具有重要意义。     

Analysis of a radial magnetic fluid seal and a radical bearing lubricated with a magnetic fluid

This paper discusses the effects of viscous pumping in a magnetic fluid seal under a rotating load. The Reynolds' equation is presented for the seal based on magnetic fluid mechanics. Expressions are given for obtaining pressures in the seal, and eccentricities of the rotating shaft because of viscous pumping and seal pressures. Numerical calculations are carried out for some sample problems and for the effect of the strength of the magnetic flux on the fluid pressure. Also, eccentricities of the shaft in the seal and the seal pressures are clarified.     

Frictional performance of an O-ring type seal at the commencement of linear motion

Results of investigation into the relationship between friction in the O-ring type seal and gauge pressure at the commencement of linear motion of a shaft are presented and discussed. A number of different O-ring materials were studied and the lowest friction under dry conditions was found to be produced by a PTFE-encapsulated silicone seal. The effect of a number of lubricating fluids on friction in the seal was also studied and the results obtained are included.     

船舶艉轴密封装置O形橡胶密封圈失效分析

介绍了船舶艉轴密封装置密封原理,通过对船舶艉轴密封装置橡胶密封圈失效形貌特征及装置失效部位密封结构的实例分析,探讨了该类O形橡胶密封圈失效的原因,并提出了相应的改进措施。分析表明,橡胶圈压缩率偏大,橡胶环及与其接触部件的材质硬度偏低和加工精度不够,密封沟槽宽度偏大,磨粒侵入和润滑不良是导致艉轴密封装置O形橡胶密封圈失效的主要原因。     

旋转轴唇型密封圈的寿命预测研究

提出基于ABAQUS软件和疲劳分析软件FE-SAFE预测旋转轴唇形密封圈寿命的方法.以某型号减速器中的输入轴与轴承端盖间的旋转轴唇形密封圈为研究对象,通过构建预紧状态下旋转轴唇形密封圈的有限元模型,获得旋转轴唇形密封圈的过盈量和理论接触宽度与唇口最大接触压力之间的关系曲线;根据ABAQUS获得的应力,并结合材料应力-循...