Cooling fans are widely used in modern industry, but during equipment operation, the blades of the cooling fan rotate in a circular motion. The interaction between the blades and the fan ring not only reduces the inflow of fresh air but can also generate a certain level of noise. Understanding and addressing these noise issues is crucial for the normal operation of equipment and the comfort of the working environment.

The Main Cause Of Noise

Speed

The level of noise is directly related to the structure of the fan blades and the speed of the DC cooling fan. Blades at different angles will produce different noises. If the airflow meets the cooling requirements, choosing a fan with a lower speed can effectively reduce noise.

Fan Blades

The stability and balance of the blades have a significant impact on noise. If the blades are stable and well-balanced, the noise will be minimal; conversely, poorly balanced blades may cause slight vibrations, which become more noticeable over time, leading to increased noise.

Bearing Issues

Misalignment in the bearings, abnormal noise from ball bearings, reduced oil in oil-lubricated bearings, and internal dirt in the fan can all cause the fan to produce noise.

Resonance Effect

If the vibration frequency of the equipment and the fan are similar, it can cause a resonance effect, significantly increasing the noise. This is particularly likely to occur in situations where the equipment has weak structural rigidity.

Fan Housing Design

Poor design of the fan housing, such as improper airflow design or substandard materials, can also cause air turbulence, thereby increasing noise.

Noise Causes During Equipment Operation Fastening Issues

If the fan’s fasteners are not tightly coupled with the equipment, the vibrations from the fan’s high-speed operation may cause repeated collisions between the mounting plate and the fan, leading to noise.

Dust Issues

If dust enters the fan’s axle, the increased friction can cause the blades to generate more noise when rotating.

High-Temperature Environment

In environments above 75 degrees Celsius, if the fan uses oil-lubricated bearings, the oil may evaporate, leading to insufficient lubrication. This increases the friction coefficient, causing the fan to produce more noise and possibly even stopping the blades from rotating.

Power Supply Issues

Poor or unstable power supply quality may cause the fan motor to malfunction, resulting in abnormal noise or sounds.

How To Reduce The Noise Of Axial Cooling Fan

Install Washers

Adding plastic or rubber washers between the fan and the mounting plate can ensure a tight fit and cushion vibrations, thereby reducing noise.

Dust Management

Install dust filters on exposed parts of the fan, preferably using metal filters, and clean them regularly to prevent the fan intake from becoming blocked.

Temperature Management

Choose the appropriate fan type based on the working environment’s temperature. Oil-lubricated bearings are suitable for environments ranging from 0-75 degrees Celsius, while dual ball bearings are better for temperatures between 75-130 degrees Celsius or from -30 to 0 degrees Celsius.

Use Shock Absorbers

Installing shock absorbers at the fan’s mounting location can effectively reduce noise caused by fan vibrations.

Optimize Power Supply

Ensure that the power supply used for the fan is of high quality and stable, preventing noise caused by power supply issues.

Regular Maintenance

Regularly inspect and maintain the fan to ensure the blades, bearings, and other components are functioning properly. Timely cleaning of dust and replacement of worn parts can effectively reduce noise.

Suggestion Of Buying And Using Fan

When purchasing a cooling fan, it’s advisable to listen to the noise first. If the noise is too loud, it’s recommended not to buy it. Noise problems are not necessarily due to poor fan quality; they could be due to insufficient lubrication of the axle or improper installation. In such cases, reinstalling the fan or adding lubricant to the axle can ensure proper operation.

Conclusion

Choosing a reputable brand of cooling fan provides better assurance. High-quality brand fans generally do not have serious noise issues, and even if they do, brand manufacturers usually offer comprehensive after-sales services to ensure the problem is effectively resolved. CGFAN is a reliable supplier, offering high-quality cooling fans and comprehensive after-sales service.