What is the reason for the Mining Contra-rotating Axial Flow Local Fan casing to overheat?

Mining contra-rotating axial flow local fans are essential for ensuring proper ventilation in underground mines. However, like any equipment, they may face operational challenges that could impact their performance. One common issue is overheating, which can be caused by several factors. If your fan is experiencing high motor temperatures, here are some potential reasons and solutions to address the problem.

1. Power Supply Voltage Issues:

High Voltage: If the power supply voltage is too high, it may cause the motor temperature to rise excessively. To resolve this, contact your power supply department to address the issue.

Low Voltage: Conversely, if the voltage is too low under rated load, the motor temperature will also increase. If you are experiencing low voltage, contact the power supply department for a solution. Additionally, if the voltage drop is too significant due to cables, consider using a thicker cable to prevent excessive voltage loss.

2. Stator and Rotor Iron Core Issues:

When the stator and rotor iron cores rub against each other, it can lead to overheating. This could be due to a few factors:

Bearing Gap Too Large: If the bearing gap is too wide, it may lead to friction between the iron cores. In this case, replace the bearing to restore proper functioning.

Spindle Bends: A bent spindle could also cause irregular contact between the iron cores. If this is the issue, straighten the spindle or replace it if necessary.

Loose or Deformed Iron Core: A loose or deformed iron core can also lead to overheating. Inspect the iron core and resolve any deformation or looseness to eliminate the problem.

3. Air Flow Issues:

The fan’s performance heavily depends on efficient airflow. If the air supply rate is too low, it could be due to:

Excessive Blowing Distance: If the air blowing distance is too long, it may reduce the fan’s effectiveness. To improve performance, shorten the blowing distance.

Obstructed Air Outlets: Check if the air outlets are obstructed. Any blockage in the outlet will reduce airflow and increase temperature. Clear the obstruction to restore proper ventilation.

4. Air Inlet Obstruction:

Finally, an obstructed air inlet can also cause overheating due to insufficient airflow. Inspect the air inlet area and eliminate any blockages to ensure proper ventilation.

By addressing these issues promptly, you can extend the lifespan of your mining contra-rotating axial flow local fan and ensure it operates efficiently, maintaining optimal ventilation in the mine.