Fan accident

In the figure, the first bearing is on the motor side; the middle one represents the entire unit. The bottom shell of the bearing housing has cracked, and the anchor bolts on the other side have broken. The last two bearings are those located on the other side of the bearing housing. It’s my first time posting pictures; it’s messy, sorry about that

Is the medium transported by the fan at a relatively high temperature? There are cooling water pipes in the bearing housing shown in the image, and the fan casing is insulated. If the temperature of the medium being transported is high, it may be because the cooling water is not turned on, or the cooling water system is blocked. Because an air test run must be carried out after the major repair; if there are no problems during the test run, and the medium being transported is at room temperature, it’s fine to operate without using cooling water. The temperature of the medium being fed for transportation is too high; without cooling water, the bearings will be damaged immediately, resulting in the phenomenon shown in the image.

There are many issues with the use of this unit’s equipment. The equipment vibration was not detected in time; the cooling water was on. Based on an analysis of the images, the outer ring and the cage are both in good condition, so it should not be caused by a lack of cooling. If only the inner ring of the bearing is deformed, can it be determined what the fit clearance was at the time of bearing installation? No any measures were taken; during operation, the vibration increased gradually. Once the load increased after material feeding, the vibration intensified further, first causing the anchor bolts to loosen, and eventually leading to the fracture of the bearing housing.

Insulation is necessary because the flue gas contains sulfur dioxide. Temperature around 100 degrees

What is the concentricity? Is the shaft runout appropriate? [Personal opinions are for reference only]

It’s the first time I’ve seen something like this; the scene is absolutely chaotic

This post was last edited by backcat666 on 2018-7-17 07:30. The oil sight glass in the bearing housing tends to become blurry over time, which can lead to incorrect readings of the oil level; as a result, the oil level may actually be too low, causing the bearings to burn out due to lack of oil. Another reason is the incorrect use or faulty installation of the bearing caps at the fixed and freely floating ends of the bearings, which results in an inappropriate alignment of the bearings and thus severe vibration, leading to bearing failure； ； Is the bearing model exactly the same as the original one? Are the fit clearances between the inner and outer rings in line with the standards? It is also possible that excessive interference between the inner and outer rings of the bearing could result in too small a radial clearance, leading to overheating and damage

From major repairs to serious accidents involving the fan. So the problem still lies with the major repair. The bottom shell of the bearing housing cracked, the anchor bolts on the other side broke, and the inner ring of the main bearing was damaged, among other issues. We once heard someone from a Shen blower factory say that they had experienced a blower accident due to the purchase of a fake SKF bearing. . . So I want to ask if there were no suspicions downstream regarding the problem with the replaced bearings.

The instrumentation and control section could be improved a bit. . .

Judging from the picture, it seems there is insufficient oil in the bearing; high-temperature grease can be used