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Time：2021-11-10Views：0
The working noise of DC fan air-cooled radiator mainly comes from three sources: friction and vibration of the bearing, vibration of the fan blade, and wind noise.
The first point. Fan blade vibration: Generally, fan blades made of plastic have a certain degree of toughness and can withstand a certain degree of physical deformation. It will also vibrate due to force during the process of pushing the air, but the amplitude is generally small. Another serious vibration is caused by the uneven mass distribution of the fan blades and the eccentricity between the center of mass and the axis of rotation. When the area (mass) or eccentricity of the fan blade is large, it may drive the fan and even the radiator as a whole to vibrate, and then spread to the entire chassis. If such a phenomenon occurs, the quality and working status of the fan should be suspected.
The second point. Bearing friction and vibration: not only produces noise, but also affects performance, shortens the life of the device, and reduces energy efficiency. These are the key technical issues to be solved in product design as much as possible.
The third point. Wind noise: The flowing air interferes with each other, rubs against the surrounding objects, the separation of the blades on the airflow, and the pulsating force of periodic air supply, etc., will all produce noise. The faster the air velocity, the more turbulence, and the greater the wind noise, and it will increase with acceleration as the wind speed increases. Ordinary axial fans will generate flyback airflow in the gap between the fan blades and the outer frame, which will produce greater wind noise, but will also adversely affect the air volume. This is why improved designs such as folding edges and side air intake have appeared. .
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