2019 - fan bearing maintenance and longevity
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27 we all know, the motor is the core component of fan, and in motor, bearing in the core is the core of his supporting the rotor rotation, reduces the friction coefficient in the operation of the rotor.
Bearing, however, it is often the most vulnerable, the fan parts service life of the shortest.
Based on years of experience in maintenance, we found that the fan fault, scrapped due to bearing problem cases, almost accounted for more than 70%.
True manufacturer can choose more high quality bearing products to extend the service life of the fan, but this often means that the customer need to pay a higher cost.
So, can be used in fan take when using means of maintenance, to extend the service life of bearing.
First of all, according to the characteristics of the bearing surface failure mechanism and bearing wear can be divided into the following four kinds: 1 fatigue wear refers to two or sliding friction surface, due to the effect of contact of the circulation, lead to material fatigue flake form, is the main form of bearing wear failure.
2 adhesive wear refers to the friction pair contact surface during sliding localized metal adhesion, adhesion in the relative sliding damaged, scratched the surface of the bearing wear form, also called occlusal wear.
3 of abrasive wear and tear caused by external hard particles or hard protuberance on the surface of material loss caused by the wear and tear.
4 corrosion and wear surface of the friction pair by lubricating oil oxidation of acid corrosion, or react with other media form of surface damage.
Above these wear form, in addition to the design of the bearing itself beyond manufacturing and material defects, the vast majority are caused due to the failure of lubricating grease.
Fan itself using occasion and multifarious, different occasions will have different effect on bearing and its grease, such as oil pollution, oil oxidation and so on, these often leads to the lubrication failure, generate additional wear and makes the bearing and fan failure.
Second, in understanding the bearing wear form and the main causes, it needs to suit the remedy to the case in the process of actual use, analysis of factors that affect the bearing grease can, take corresponding to evade or maintenance means.
After years of summary, the bearing grease has the following two kinds of influential factors: 01 ambient temperature too high bearing grease under a certain temperature can keep a long life, with its design life, but under the environment of high temperature, oil will accelerate ageing.
In general, each oil design temperature 10 ℃, environment temperature grease life will be reduced 50%.
In order to reduce the influence of environment temperature on the oil life, in general can through the replacement of high temperature grease or increase the motor model in two ways.
Replacement of high temperature grease can make bearing grease at higher ambient temperatures can also maintain design life, increase the motor model can effectively reduce the operation temperature, when the environment temperature lower bearing, extend the life of the grease.
02 sand and dust most particularly the rotor fan products, their level of motor protection are designed to IP54, in the context of environmental factors before, have already mentioned to IP54 motor does not completely isolated from water and dust entering, where some sand serious when using if ventilation system does not do enough to protect themselves from blowing sand measures, the dust is likely to enter the motor inside.
After a lot of dust inside the motor, will adhere to the motor in the bearing surface, and follow the bearing gap into the bearing.
Subsequently, the grease of the bearing inner dirt infiltration gradually reduce the lubrication performance, finally completely out of lubrication.
Thus, when these places use fan (
Such as desert, cement plants, steel mills, etc. )
Strainer mesh, it is suggested that the match in the ventilation system design, as far as possible, reduce the influence of sand and dust on the bearing, the veterinarian.
In addition to the above two will have long-term effects of environmental factors on the bearing grease, happened in the process of transportation, storage, installation, knock against, vertical installation of the fan and fan factors such as weight, sometimes bearing causes uneven stress, in the long run, this part of the non-uniform stress will make the bearing acceleration produces fatigue wear.
Fan as a precision product, therefore, should be paid attention to in every link of protection, light with light, avoid unnecessary loss.
