原文:泵用机械密封走漏点分析及其维修方案一、正常运转中忽然走漏。离心泵在运转中忽然走漏少数是因正常磨耗或者已达到使用寿命,而大多数是由于工况变化较大或者操作、维护不当引起的。一、抽空、气蚀或者较长时间憋压,导致密封粉碎;2、对于泵实际输出量偏小,大量介质泵内循环,热量积聚,引起介质气化,导致密封无效;3、回流量偏大,导致吸人管侧容器(塔、釜、罐、池)底部沉渣泛起,损坏密封;4、对于较长时间停运,重新起动时没有手动盘车,摩擦副因粘连而扯坏密封面;5、介质中腐蚀性、聚合性、排污泵结胶性物质增多;六、环境温度急剧变化;7、工况频繁变化或者调整;8、忽然停电或者故障停机等。离心泵在正常运转中忽然走漏,如不能及时发现,往往会酿成较大事故或者损失,须予以重视并采取有效措施。二、泵用机械密封检修中的几个误区一、弹簧压缩量越大密封效果越好。其实不然,多级泵弹簧压缩量过大,可导致摩擦副急剧磨耗,瞬间烧损;过度的压缩使弹簧失去调节动环端面的能力,导致密封无效。2、动环密封图越紧越好。其实动环密封圈过紧有害无益。一是加剧密封圈与轴套间的磨耗,过早走漏;二是增大了动环轴向调整、移动的阻力,在管道泵工况变化频繁时无法适时进行调整;三是弹簧过度疲惫易损坏;四是使动环密封圈变型,影响密封效果。3、静环密封圈越紧越好。静环密封圈基本处于静止状况,相对较紧密封效果会好些,但过紧也是有害的。一是引起静环密封因过度变型,影响密封效果;二是静环材质以石墨居多,一般较脆,过度受力极易引起碎裂;三是安装、拆卸困难,极易损坏静环。4、叶轮锁母越紧越好。机械密封走漏中,中开泵轴套与轴之间的走漏(轴间走漏)是比较常见的。一般认为,轴间走漏就是叶轮锁母没锁紧,其实导致轴间走漏的因素较多,如轴间垫无效,偏移,轴间内有杂质,轴与轴套配合处有较大的形位误差,接触面粉碎,轴上各器件间有间隙,轴头螺纹过长等都会导致轴间走漏。锁母锁紧过度只会导致轴间垫过早无效,相反适度锁紧锁母,使轴间垫始终连结必然的压缩弹性,在运转中锁母会自动适时锁紧,使轴间始终处于良好的密封状况。5、新的比旧的好。相对而言,消防泵使用新机械密封的效果好于旧的,但新机械密封的质量或者材质选择不当时,配合尺寸误差较大会影响密封效果;在聚合性和渗透性介质中,静环如无过度磨耗,还是不更换为好。因为静环在静环座中长时间处于静止状况,使聚合物和杂质沉积为一体,起到了较好的密封作用。六、拆修总比不拆好。一旦出现机械密封走漏便急于拆修,其实,有时密封并没有损坏,只需调整工况或者适当调整密封就可消除走漏。这样既避免浪费又可以验证自己的故障判定能力,积累维修经验提高检修质量。

"Pump mechanical seal leakage and installation errors"是由中国离心泵网提供的水泵行业新闻,译文仅供参考。另外,中国离心泵网还提供相关产品搜刮:离心泵型号、离心泵价格、离心泵技术、离心泵新闻、离心泵出产商等。

译文:Pump mechanical seal leak analysis and maintenance program First,the normal operation of asudden leak.Centrifugal sudden leak in the operation of asmall number is due to normal wear and tear,or has reached the life of the majority is due to agreater or operation conditions change,caused by improper maintenance.1,vacuum,air pressure-loss or alonger time,resulting in seal damage;2,the actual output of the pump is low,a large number of medium circulation pump,heat build up,causing media gasification,resulting in seal failure;3,back flow is too large,causing suction tube side of the vessel(tower,tank,tank,pool)at the bottomSuber-water pumps to rise again,damaged seal;4,longer outages,re-start without manual plate car,Friction due to adhesion and to rupture the sealing surface;5,medium resistance,polymerization,increased Gellan gum substances;6,rapid temperature changes;7,frequent changes in conditions or adjustments;8,such as sudden power outages or downtime.Suddenly in the normal operation of the pump leak,if not in time,often causing large accident or loss should be seriously and take effective measures.2,pump mechanical seal inspection of several errors 1,the greater amount of spring compression sealing the better.In actual fact,excessive compression spring can lead to rapid wear of friction pairs,instant burning;excessive compression of the spring lose their ability to adjust ring face,resulting in seal failure.2,moving the more compact the better ring seal plan.In fact,ring seals tight harm than good.First,Screw pumps increasing the wear between the ring and sleeve,premature leakage;Second,increased ring axial adjustment of the resistance movement,when the conditions change frequently unable to make timely adjustments;Third,over-tired and fragile spring;4 is to ring ring deformation,affecting sealing effect.3,static ring seals more tightly as possible.Basic static ring seals at rest,relatively 关了 sealing effect would have been better,but too tight is harmful.The first is caused by excessive deformation due to static seal ring,seal effect;second static ring materialMagnetic pumps to graphite majority,are generally more brittle,the force can easily cause excessive fragmentation;third is to install,difficult to remove,easy to damage the stationary ring.4,impeller lock master the more compact as possible.Mechanical seal leaks in leak between the sleeve and the shaft(axis leak)is more common.Is generally believed that the impeller shaft between the leak is not the lock master lock,in fact,the factors leading to more leakage axis,such as the axis pad failure,migration,axis there are impurities,shaft and sleeve with alarger form of office position Self-priming pumpserror,contact surface damage,there are gaps between the various components axle shaft so the first thread will result in long axis leakage.Lock master lock pad over will only lead to premature failure of axis,the opposite lock appropriate locking mother,so that axis in the compression pad to always maintain acertain flexibility in the operation of the lock master lock automatically in due course,so that axis is always in good sealed state.5,the new better than old.In contrast,using the new mechanic al seal better than the old,but the new mechanical seal of quality or choice of materials is not the time,with the larger size of the error will affect the seal;in the aggregate and permeability medium,without excessive static ring wear,or not replaced at all.Because the static ring along time in the stationary ring seat in astationary state in the polymer and impurities deposited as awhole played aChemical pumps good sealing effect.6,overhaul is better than the old one better.The event of amechanical seal leakage will be eager to overhaul,in fact,sometimes 关了d and not broken,just adjust the operation or the appropriate adjustments can be sealed to eliminate leakage.In this way,avoiding waste and can determine the ability to verify their failure to accumulate maintenance overhaul to improve the quality of the experience.原文来源: