Basic requirements for bearing temperature of axial flow fans

The basic requirements for bearing temperature of axial flow fans can be summarized as follows:
Normal operating temperature:
The normal working temperature of rolling bearings should not exceed 70 ℃, and the instantaneous maximum temperature should not exceed 95 ℃.
The normal working temperature of sliding bearings should not exceed 75 ℃.
Under specific conditions and without special requirements, the temperature rise of bearings shall generally not exceed 40 ℃ above the ambient temperature.
Effective value of vibration speed:
The effective value of vibration speed of bearings should not exceed 6.3mm/s (refer to Article 1), but another reference in Article 2 mentions that the effective value of vibration speed at the bearing part of explosion-proof axial flow fans should be less than 7.1mm/s.
Influencing factors:
The temperature of axial fan bearings is influenced by factors such as load size, bearing speed, ambient temperature and humidity, lubrication conditions, bearing structure, and wear (refer to Article 3).
Maintenance measures:
In order to maintain the fan bearings within the appropriate temperature range, it is necessary to ensure good lubrication conditions of the bearings, replace lubricating oil in a timely manner, and maintain good ventilation without blocking the air ducts to ensure bearing heat dissipation (refer to Article 3).
Emergency parking conditions:
If severe vibration, impact, and rapid increase in bearing temperature are found in the axial flow fan, emergency shutdown inspection must be carried out (refer to Article 2).
In summary, the basic requirements for bearing temperature of axial fans include a normal operating temperature range, limitations on the effective value of vibration speed, and temperature rise limitations under specific conditions. At the same time, it is also necessary to pay attention to the influencing factors and maintenance measures of bearing temperature to ensure the normal operation of the axial flow fan.