To determine whether the bearings of the Roots blower need to be replaced, the following aspects can be considered:
-In terms of appearance**
-Surface wear: Carefully observe the raceway and rolling element surfaces of the bearing. If there are obvious wear marks such as scratches, pits, peeling, etc., it will affect the accuracy and stability of the bearing operation, usually indicating that the bearing needs to be replaced.
-Cracks and Deformation: Check the inner and outer rings, cage, and other parts of the bearing. If there are cracks, even small ones, they may cause the bearing to suddenly fail and need to be replaced in a timely manner. In addition, if the bearing deforms, such as ovality exceeding the allowable range, it will also cause a decrease in the fitting accuracy between the bearing and other components, leading to vibration and noise. At this time, bearing replacement should also be considered.
-Corrosion situation: Severe corrosion can weaken the strength of bearings, damage their surface smoothness, increase frictional resistance, and lead to poor operation. When there is extensive corrosion on the surface of the bearing and it cannot be restored through simple treatment, it needs to be replaced.
-* * In terms of operating parameters**
-Abnormal Temperature: During normal operation, the temperature of the bearing generally remains within a stable range. If the temperature of the bearing suddenly rises, exceeding the normal operating temperature (such as exceeding 80 ℃), and other factors such as lubrication and heat dissipation are excluded, it is likely that there is an internal fault in the bearing, such as increased wear and reduced clearance. At this time, bearing replacement should be considered.
-Vibration and Noise: When the Roots blower is operating normally, the vibration and noise are relatively stable and small. If there is a problem with the bearing, it can cause abnormal vibration and noise. If you hear sharp friction or impact sounds, or feel a significant increase in fan vibration, and determine through spectral analysis that the fault is caused by the bearing, then it is necessary to replace the bearing.
-Speed variation: When the bearing is damaged to a certain extent, it will affect the speed stability of the fan. If the fan experiences significant speed fluctuations during operation and other factors such as the motor and power supply are excluded, it is likely to be a problem with the bearings, and further inspection is needed to determine if the bearings need to be replaced.
-* * In terms of measurement data**
-Clearance measurement: Use professional measuring tools such as feeler gauges, clearance gauges, etc. to measure the clearance of bearings. If the clearance exceeds the specified range, whether it is too large or too small, it will affect the performance of the bearing. Excessive clearance can lead to increased vibration and noise, while insufficient clearance may cause the bearing to heat up and wear more severely. In this case, it is generally necessary to replace the bearing.
-* * Dimensional accuracy * *: Measure the inner diameter, outer diameter, width, and other dimensions of the bearing using calipers, micrometers, etc., and compare them with the original specifications. If the dimensional deviation exceeds the tolerance range, it will cause poor fit between the bearing and the shaft, bearing seat, etc., affecting the normal operation of the fan. In this case, it is usually necessary to replace the bearing with a new one.
In practical judgment, it is recommended to comprehensively consider multiple factors mentioned above to accurately determine whether the bearings of the Roots blower need to be replaced. At the same time, regular maintenance and inspection of Roots blowers can help detect potential bearing problems in a timely manner, prepare for replacement in advance, and avoid fan failure and shutdown due to sudden bearing damage, which can affect production.
