What affects the bearing temperature rise of a fan?
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There is a fan on the device, and the temperature of its bearings has been very high these past few days. It was checked by the third maintenance team, but no cause was identified. I would like to ask whether a clogged filter at this inlet, with the frequency converter remaining unchanged (usually around 80), can cause an increase in the temperature of the bearings due to the prolonged operation of the pump Can any expert give an answer?
Medium temperature, installation concentricity, whether the bearings are installed too tightly, motor balance, bearing housing cooling system,
The temperature of the medium has not changed, and there are no issues with installation. The motor has experienced oil deficiency in the past, but grease was added in a timely manner. This time the situation is rather unusual, as no cause could be identified.
【If the filter at the inlet is clogged, and the frequency conversion remains unchanged (usually around 80%), could prolonged operation of the pump cause an increase in the temperature of the bearings?】 This is possible; the question is whether it is the motor bearings that experience high temperatures, or the fan bearings
What kind of fan is it? Is there a model number? What is the motor current? Is it a centrifugal fan or a multi-stage centrifugal fan? Is it an exhaust fan, a blower, a main fan, or a Roots fan? The reasons for high bearing temperatures vary depending on the type of fan
Forgot the model number; will provide it tomorrow
Due to a lack of lubrication, the lubricant may have coked, and impurities inside the bearing have caused the temperature to rise.
The motor bearings are running low on oil, right? What’s the current temperature of the motor bearings? A temperature below 60 degrees is not a problem; if it exceeds 60 degrees, it’s still possible to operate the motor for a short period even if the temperature doesn’t keep rising, but regular inspections should be intensified. It’s recommended to check the bearings and replace them if there are any issues. In my opinion, the lack of oil in the bearings causes wear, which leads to heating during operation. Other reasons for heating include: 1) Poor alignment of the couplings, resulting in vibrations that cause the motor bearings to heat up; 2) Imbalance in the fan rotor, leading to wear and vibration in the fan bearings, which in turn causes the motor bearings to heat up; 3) Imbalance in the motor rotor can also cause bearing heating, and in severe cases, it can even lead to the motor rotor scraping against the casing; 4) Too little lubricant applied can cause bearing wear and heating, while too much lubricant, due to its higher viscosity, can also cause bearing heating; 5) An increase in the load on the fan leads to an increased load on the motor, which again causes the motor bearings to heat up. As for a clogged filter at the fan inlet, it depends on what type of fan you have
Given the many uncertainties, and based only on the information indicated above, it is recommended to clean the motor; a high motor temperature can also lead to high bearing temperatures. Bearings such as those using grease are likely to be rolling bearings.