What Are the Key Safety Considerations for Tunnel Axial Flow Fans?

Tunnel axial flow fans are critical components in tunnel ventilation systems, and ensuring their safe operation is essential for both equipment longevity and worker safety. Below are some important safety warnings and operational guidelines to follow when handling these fans.

1. Motor and Fan Assembly

This series of tunnel axial flow fans is equipped with Y series three-phase asynchronous motors, which are installed in the fan casing with a specific compression strength to ensure stability and performance.

2. Fan Start-Up Warning

Before starting the fan, it’s important to check the radial clearance between the impeller excircle and the fan barrel. The clearance should fall within the range of 1.5 to 4 mm, and it must be even along the peripheral direction. When manually rotating the impeller, it should rotate smoothly and without resistance. Any fabrication or vibration could indicate a potential issue that requires attention.

3. Motor Check After Long Distance Transportation or Extended Idle Periods

If the motor has been transported over long distances or left unused for an extended period, it’s crucial to measure the insulation resistance of the stator. The value must not be less than 50MΩ. If it passes this test, the power supply can be turned on, and a 10-minute test run should be conducted. During this run, if there is no abnormal noise, the motor can be put into normal operation.

4. Electrical Installation Warning

Electrical installation of the fan and its control cabinet should only be performed by a licensed and qualified electrician. Additionally, the fan must be reliably grounded to ensure electrical safety and avoid potential hazards.

In conclusion, when operating tunnel axial flow fans, it’s essential to follow these safety warnings and procedures to ensure safe, effective operation. Proper checks before use, along with correct installation and maintenance, will help prevent accidents and ensure the longevity of the equipment.