The Generation and Control of Industrial Fan Noise 7 Causes, 5 Solutions
Causes There are several main points:
First, dust and dirt accumulation.
Industrial environments tend to be dusty, and after the fan has been running for a long time, dust and dirt will accumulate on the fan blades, motor and heat sink. This will affect the dynamic balance of the fan, resulting in unstable fan operation, which generates greater noise. For example, in cement factories, coal mines and other places, the fan is easily covered by a large amount of dust.
Second, fan parts wear.
1. Wear of bearings: long time running will make the bearings wear out, resulting in lower concentricity of the fan shaft, shaking and friction during operation, which in turn causes noise.
2. Blade wear: collision with foreign objects or long-term wear and tear may make the blade deformation or gap, disrupting the balance of the fan's airflow, increasing noise. In some factories with long continuous operation time, the wear of fan bearings and blades is more common.
Third, the fan is loose or improperly installed.
1. When the fan is installed, if the fixing screws are not tightened, or the installation position is not smooth, the fan will produce vibration and resonance during operation, thus increasing the noise.
2. The connection between the fan and other components is not tight, which will also lead to increased vibration and noise. For example, in some temporary production lines, the fan installation may not be standardized enough and is prone to loose problems.
Fourth, motor failure.
1. Short-circuit, disconnection or insulation damage of the coil inside the motor will cause the motor to work abnormally and produce noise.
2. Problems with the motor's drive circuit, such as unstable voltage, current fluctuations, etc., will also affect the normal operation of the fan, triggering noise. This situation may occur in some aging equipment or plants with unstable power supply.
Fifth, the fan speed is too high.
In order to meet the demand for high-intensity heat dissipation, the fan may be set to run at too high a speed. The higher the rotational speed, the greater the wind noise and vibration produced by the fan, resulting in increased noise. For example, in large data centers, in order to give the server cooling, the fan may be running at high speed, resulting in greater noise.
Sixth, the air ducts are not reasonably designed.
1. Narrow, curved or blocked air ducts will make the airflow is not smooth, increasing the working pressure of the fan, thus generating more noise.
2. airflow vortex or turbulence in the duct, will also cause noise. In some complex industrial ventilation systems, air duct design is not reasonable is a common source of noise.
Seven, fan quality problems.
1. Low-quality fans are selected, with poor manufacturing processes and materials, which are inherently prone to greater noise.
2. Fan design is unreasonable, such as blade shape, angle, etc. does not comply with the principles of fluid dynamics, will also lead to increased noise. Some factories that choose poor quality fans in order to reduce costs may face greater noise disturbances.
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① Avoid placing obstacles in areas of high wind speed close to the fan.
② Use a vibration isolator to eliminate the transmission of mechanical noise from the fan to the chassis system.
③ Use a reinforcement structure to control the resonance frequency of the chassis system.
④ Mount the fan on the inside surface of the chassis system instead of the outside surface.
⑤ Obstacles placed near the fan intake generate more noise than those placed near the fan outlet.
Maximum fan efficiency coincides precisely with minimum noise, and any fan mounting feature that tends to reduce fan efficiency may therefore increase noise. Two common examples are bends near the fan (especially on the intake side) and dampers (near the fan intake or exhaust). Ideally, for maximum fan efficiency and minimum noise, make sure there are at least 2 or 3 ducts. Eliminating straight duct diameters that may interfere between the airflow and any features of the fan itself will typically reduce noise by 3 to 12 dB.
