1. sound and explosion proof blower
It is difficult to judge the cause of the abnormal noise when the fan is in operation quickly and correctly, and it must be fully investigated. The common causes are as follows: the intake pipe sucks solid impurities; the stator and rotor of the fan are locked; the bearing is abnormal. At this point, often accompanied by vibration in abnormal noise. At the same time, the abnormal noise produced in prime mover and mandatory fuel supply should also be noted.
2. check vibration
Similar to the abnormal sound, it is difficult to judge the cause of the violent vibration of the fan directly, and it is necessary to pay close attention to it and check it adequately. There are many types of vibration: mechanical vibration of fluid caused by surge; vibration caused by poor alignment of fan and prime mover; unreasonable installation of fan and abnormal quiet condition of bearing; vibration intensified by long-term operation of impeller; mechanical vibration caused by contact between rotor and stator clearance. The judgement of the vibration state of bearing parts is shown in JB/T 8689-1998.
3. bearing inspection
The temperature side of the bearing is most important for understanding the working condition of the bearing. It is generally stipulated that the temperature rise of the bearing should not be higher than the ambient depression of 4090. In addition, attention should also be paid to the amount of lubricating oil and its contamination, whether oil leakage, oil temperature and oil pressure in different situations. For cooling fans that use cooling water, we should also pay attention to the water and water of cooling water. For fans with oil ring bearings, it should also confirm whether the oil ring work is normal.
4. inspection of shaft seal part
Always check the leakage condition of the shaft seal, the gap or contact between the static part and the shaft, whether there is contact at one end, heating, abnormal vibration, abnormal sound and so on.
5. prosecutors in other parts
Pay attention to outflow pressure, intake pressure, air volume, current and so on. Discover abnormal situations in time and prevent them from happening.
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