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沼气发电机组轴电流故障怎么诊断?

来源:http://www.huannengpower.com   发布于:2018-08-14

因为转子带电引起轴电流终极造成机器元件损伤的情况较早泛起在沼气发电机,故一般把轴电流形成的原因与电磁效应联系起来。跟着大型石油、化工装置,特别是化肥装置中蒸汽透平驱动离心压缩机组的应用,轴电流影响沼气发电机长周期安全运行的题目越来越凸起,它在沼气发电机的推力轴承、径向轴承、联轴节、浮环密封以及传动齿轮等部位产生电火花放电,损伤金属表面,破坏油膜形成。假如这种损伤没有及时检测到,则会给机器运转带来良多题目,并可能造成机器主要元件的严峻破坏。

Because the axial current caused by the rotor charged ultimately causes damage to machine components in the early emergence of biogas generator, so generally the formation of shaft current and electromagnetic effects associated. With the application of centrifugal compressors driven by steam turbines in large petroleum and chemical plants, especially in fertilizer plants, the problem of shaft current affecting the long-term safe operation of biogas generators has become increasingly prominent. It is produced in thrust bearings, radial bearings, coupling, floating ring seals and transmission gears of biogas generators. The electric spark discharge damages the metal surface and destroys the formation of oil film. If this damage is not detected in time, it will bring many problems to the operation of the machine, and may cause severe damage to the main components of the machine.

有关轴电流故障的先容资料比较少见,在此结合出产中碰到的实际题目做一简朴先容。

The introduction of shaft current fault is relatively rare, in this connection with the actual problems encountered in production to do a simple introduction.

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旋转中的轴须采用一定的润滑方式使转子与轴承保持不直接接触,即整个转子在高速旋转时与静子之间有油膜绝缘。因为转子对地存在电阻,一旦带电,就会建立起对地电压,当电压升高到某一数值,就会在电阻最小的区域击穿,发生电火花放电。这种放电作用所带来的主要后果如下:

Rotating shaft must adopt a certain lubrication way to keep the rotor and bearings in direct contact, that is, the entire rotor and stator in high-speed rotation between the oil film insulation. Because the rotor has resistance to the ground, once charged, it will establish a voltage to the ground, when the voltage rises to a certain value, it will break down in the area of the smallest resistance, spark discharge occurs. The main consequences of this discharge are as follows:

(1)在放电区域熔化金属粒子,在金属表面形成极微小的电蚀凹坑;

(1) melting metal particles in the discharge area and forming tiny electrical pitting on the metal surface.

(2)凹坑的蕴蓄使表面变得粗拙,失去光泽,假如发生在轴瓦上则会产生纯机械磨损;

(2) The pits make the surface rough and lose luster. If they occur on the bearing bush, pure mechanical wear will occur.

(3)熔化的金属微粒进入润滑系统,使润滑剂受到污染,整个润滑系统的润滑机能变坏,而且含有大量金属微粒的润滑剂会降低油膜电阻,加速电火花腐蚀的进展;

(3) The molten metal particles enter the lubrication system, causing the lubricant to be polluted, the lubrication function of the whole lubrication system deteriorates, and the lubricant containing a large number of metal particles will reduce the oil film resistance and accelerate the progress of EDM corrosion.

(4)在轴承承载区产生局部高温,破坏油膜,烧坏金属,增加磨耗,终极造成严峻的摩擦损坏。

(4) Local high temperature occurs in bearing bearing bearing area, which destroys oil film, burns out metal, increases wear and eventually causes severe friction damage.

在旋转机械的转子系统中,最轻易发生电火花放电的部位是径向轴承和止推轴承的承载面、齿式联轴器的工作齿面以及浮环密封面,这些部位因运行中的多种前提变化(如负荷、温度、润滑状况以及转子振动等),均有可能会使油膜和气隙电阻减小,在这些部位引起电火花放电现象。

In the rotor system of rotating machinery, the most easily discharged parts are the bearing surface of radial bearing and thrust bearing, the working tooth surface of tooth coupling and the sealing surface of floating ring. These parts may cause oil because of various premises (such as load, temperature, lubrication condition and rotor vibration, etc.). The film and air gap resistance decrease, resulting in EDM phenomenon at these locations.

对于径向滑动轴承,轴承电蚀凹坑的发展会使巴氏合金表面受到严峻的侵蚀,这不仅会改变轴承的原有间隙,而且表面光洁度下降还会导致轴承表面的擦伤和擦痕、局部高温顺烧伤。高速轻载轴承表面巴氏合金的磨耗会使一部门轴瓦瓦块失去对转子轴颈的预负荷作用,转子在旋转时轻易诱发油膜涡动,造成转子系统的不不乱。而不不乱的油膜反过来又会引起轴承油膜电阻的急剧下降,使更多的轴电畅通流畅过该区域,加剧电火花作用,彼此相互激励,终极导致轴承或转子系统的损坏。

For radial journal bearings, the development of electric erosion pits in bearings will cause severe erosion on the surface of Babbitt alloy. This will not only change the original clearance of bearings, but also lead to surface abrasion and scratches, local high temperature along burn. The wear of Babbitt alloy on the surface of high-speed light-load bearing will cause a part of bearing bush to lose the preloading effect on the rotor journal. The oil film whirl is easily induced when the rotor rotates, resulting in the rotor system is not disturbed. On the other hand, the disorderly oil film will cause a sharp drop in the resistance of bearing oil film, make more shaft electricity flow smoothly through this area, aggravate the role of electric spark, excite each other, and ultimately lead to the damage of bearing or rotor system.

本文由沼气发电机组提供技术支持,更多的详细精彩内容请点击http://www.huannengpower.com 我们的官方网站,我们将会全心全意为您提供满意的服务。

This article is supported by biogas generator. For more details, please click on our official website at http://www.huannengpower.com. We will provide you with satisfactory service wholeheartedly.


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