The free end bearing of the multi-stage centrifugal fan is hot and makes abnormal noise.
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Dear Masters: Please tell me, a multi-stage centrifugal fan, free end bearing (SKF 6315), use 2# lithium grease. Within the first 40 hours of operation, the temperature was about 56°C, and the radial horizontal, vertical, and axial vibrations were less than 2.0mm/s. Later, the radial horizontal vibration increased to 3.1mm/S, noise appeared, and the bearing temperature was about 63°C. After trying to replenish grease, the bearing temperature rose to about 82°C and dropped to about 73°C after draining the oil. In the same situation, after the centrifuge was disassembled, there was a large amount of grease in the balance chamber. Please help analyze the reasons!
The vibration speed of 3.1 is not too high, but filling it with so much grease is definitely not conducive to heat dissipation! ! !
Lubricating grease does not mean that the more the better, the right amount is best. Generally, manufacturers will have suggestions. Too much is not conducive to heat dissipation.
The vibration is not too big. If the grease is not replenished, it will leak along the oil seal, causing the bearing to be short of oil. So I kept replenishing the oil.
Did this happen after you replaced the bearing?
The vibration value is not high and within a reasonable range. The oil may be related to the ambient temperature, and it is not easy to overdose if it is supplemented appropriately.
There is a problem with the bearings. There is a problem with the grade of the bearings used. The higher the grade, the better.
There are many reasons, and the answer will be better found with a specific description.