公司资讯 行业资讯
  • 机械密封泄漏情况有哪几种
  • 本站编辑:杭州久密机械科技有限公司发布日期:2020-03-07 10:20 浏览次数:

机械密封主要用的部件有静环以及动环等端面密封部件;起辅助作用的还有O型、U型以及X型等各式类型的密封圈;补偿部件包括弹簧、推环等;传动部件有传动螺钉和传动销等;紧固部件包括很多,有推环、弹簧座、压盖以及紧定螺丝等等。

那么机械密封大多用在什么设备上呢?一般情况下,机械密封多用在离心泵、离心机、压缩机和反应釜等设备上。它的密封性能好,泄漏量少、使用 寿命较长、能量功耗较低,也不需要经常进行维修。机械密封在适应能力上也是非常好的,一般情况下都能够适应自动化的生产以及高温高压等各种恶劣环境以及对密封的苛刻要求条件。

常见的机械密封泄漏情况有以下几种:

1.由密封面平面度的损坏造成的泄漏

密封面的损坏大多是产生不均匀的滑痕和面部切断痕。产生的原因可能是由于泵的密封箱和搅拌器的封头变形或者损伤,又或者是螺栓紧固力度不均匀等,导致静环的密封面发生变形,比较后发生泄漏现象。也有可能是由于滑动部件在热装时,温度的变化以及存在热膨胀差使得密封面的形状发生变化。密封性也会因此而发生损坏,进而导致泄漏问题。

2.有密封面的润滑性损坏而造成的泄漏

端面密封的润滑性也是非常重要的,除了要靠端面液膜进行密封作用,同时也要靠润滑的作用来完成正常的运行工作。端面液膜一旦破损,便会造成千摩擦密封面瞬间磨损和粗糙加剧,甚至一些硬质材料也会产生裂痕等严重现象。当滑动摩擦面的温度骤然上升时,不能立刻除掉热积累情况的话,会导致密封液的蒸发,润滑膜消失,进而导致千摩擦现象的发生。千摩擦很容易损伤密封面,并且埋下了大量泄漏的隐患。

3.由动作性损坏造成的泄漏

机械密封装置的动环与静环是随着轴一直旋转的,它们一直频繁而重复着相同的运动,这种重复性的运动不仅会对密封端面产生改变,同时也会增加装置的轴向移动量,逐渐降低了机械密封的精度。这样长期下来,装置的各个部件都会产生损伤甚至变形,进而失去了随动性,导致密封的泄漏。

什么情况会影响机械密封的动作性呢 ? 浆料的堆积会使得弹簧作用受阻、滑动部件动作失控、密封面的表面遭到磨损等,严重影响着机械密封的动作性;当滑动密封面出现磨损、硬化和老化等情况时,轴和轴套会因此而损坏,弹簧座也会磨损甚至弯曲。

4.由多种因素叠加在一起而造成的泄漏

泄漏的发生有时候是由于多种因素叠加而成的,例如千摩擦、滑动不良、滑动环变形以及平面度变形等多种因素叠加在一起,很容易因此而造成泄漏现象。这些原因很多都是由于过度疲劳、受压不均匀及液膜破坏所造成的。因此正确的安装和保持机械密封的清洁度是非常重要的内容,加上良好的冷却作用,这样可以更好的消除隐患

Mechanical seal technology relies on a pair or pairs of relatively sliding ends perpendicular to the shaft, which can still maintain the joint under fluid pressure and other force compensation mechanisms, combined with auxiliary seal devices, to achieve leakage stoppage. The FECT mechanical seal keeps the contact ring and the moving ring of the static ring in motion. The aim of the seal is to create a suitable specific pressure between the stationary ring and the moving ring and to maintain a liquid film between them. The main parts used for mechanical seal are static ring and moving ring, and the auxiliary parts are o type, U type and x Type Sealing rings, and the compensation parts include spring, push ring, etc. The driving parts include driving screw and driving pin, and the fastening parts include pushing ring, spring seat, gland and fastening screw, etc. . So what equipment is mechanical seal mostly used in? In general, mechanical seals are used in centrifugal pumps, centrifuges, compressors and reactors and other equipment. The utility model has the advantages of good sealing performance, less leakage, long service life, low energy consumption and no need for frequent maintenance. Mechanical seal is also very good in adaptability, generally can adapt to automated production and high temperature and high pressure and other harsh environment and seal requirements. Seal leakage problems common mechanical seal leakage cases have the following: 1. By the SEAL surface flatness of the damage caused by leakage seal surface damage is mostly caused by uneven slip marks and facial cut marks. The cause may be due to the pump seal box and agitator head deformation or damage, or bolt fastening force is not uniform, resulting in static ring sealing surface deformation, and finally leakage. It is also possible that the change of temperature and the difference of thermal expansion caused the change of seal surface shape. The seal can also be damaged, leading to leakage problems. 2. The lubrication of the leakage end face seal caused by the lubrication damage of the seal face is also very important, in addition to the end face liquid film to seal the role, but also to complete the normal operation of the role of lubrication. Once the end of the liquid film damage, it will cause friction seal surface wear and roughness, and even some hard materials will have cracks and other serious phenomenon. When the temperature of the sliding friction surface rises suddenly, if the heat accumulation can not be removed immediately, it will cause the evaporation of the sealing liquid and the disappearance of the lubricating film, which will lead to the thousand friction phenomenon. Thousand Friction is easy to damage the sealing surface, and buried a large number of potential leakage. 3. The moving ring and the stationary ring of the leaking mechanical seal caused by the action damage are always rotating along with the shaft, and they are always in the same motion frequently and repeatedly. This repetitive motion will not only change the seal face, at the same time, it will increase the axial movement of the device, and gradually reduce the precision of the mechanical seal. In this way, over a long period of time, each component of the device will be damaged or even deformed, and then lose the serviceability, resulting in leakage of the seal. What conditions will affect the mechanical seal of the action? First of all, the accumulation of slurry will make the function of the spring blocked, the movement of the sliding parts out of control, and the surface of the seal face will be worn, which will seriously affect the movement of the mechanical seal, the shaft and sleeve will be damaged, and the spring seat will wear out and even bend. 4. The leakage caused by the superposition of many factors is sometimes caused by the superposition of many factors, such as thousand friction, poor slip, slip ring deformation and flatness deformation, etc. , it could easily cause a leak. Many of these reasons are due to excessive fatigue, uneven pressure and liquid film damage caused by. Therefore, the correct installation and maintenance of mechanical seal cleanliness is very important, coupled with good cooling effect, this can better eliminate hidden dangers.