What are the sources of dc cooling fan noise
Dc fan noise is an important problem all fan purchaser attention, if a long time at a high sound level environment noise, the noise will really hurt to human body and spirit! At present, a lot of fan noise test of dc fan manufacturer for pressure measurement, refers to the dc fan on top of suspension bracket in sound level meter in the fan inlet air side to measure the position of the axial distance of 1 m, or completely record the work noise, and then a detailed analysis. The noise of the fan is caused by what?
air cooled radiator working noise there are three main sources: bearing friction and vibration, the vibration of the blade, wind noise.
the first point. The vibration of the blade: generally made of plastic fan blade has a certain toughness, can withstand a certain degree of physical deformation, also in the process of pushing air because of mechanical vibration, but generally small. Another serious vibration is due to the blade quality distribution, center of mass and rotation axis eccentricity. When the door leaf area ( Quality) Or eccentricity larger cases, may drive the fan and radiator overall vibration occurs, and then spread to the whole case. In the event of such a phenomenon, should doubt fan quality and working condition.
the second point. Bearing friction and vibration: not only the noise, and impact performance, shorten the device life, reduce the efficiency of energy utilization, is as far as possible to solve the key technical problems in product design.
the third point. Wind: the flow of air between blunt talk to each other, with the surrounding objects, friction, and the separation of blade for air, periodic supply air pulse power, etc. , will produce noise. The faster the air velocity, turbulence, the more often wind noise is bigger, and will increase with the increase of wind speed in acceleration. Common in axial flow fan blades and the space between the casing outside the joints of the flyback airflow, produce a wind noise at the same time, more can cause adverse effect to air volume, is therefore a flange, side in the wind, and so on to improve design.
wen ling tong chi technology co. , LTD. , founded in 2001, has tong chi technology co. , LTD. , zhejiang manufacturing research and development base is located in wenling city baoan district longhua new district snow hillock fengtian innovation industrial park 2 / f, 308 north road, has its own factory building area of 3600 square meters, production workshop for air conditioning dust-free workshop.
brushless dc fan and over the years the company is committed to r&d and manufacture of ac fan, and factory has passed ISO9001 management system certification, UL, CE, TUV, ROHS, CCC and other international safety certification, in 2008 to implement ROHS ( Lead-free) Process, the production of dc fan, ac fans, blowers, cross flow fan, waterproof EC fan, fan, purifier fan, has widely used in all kinds of electronic products, mechanical equipment, power supply, medical treatment, purifier, stage lighting, automobile, refrigeration and heat transfer, beauty equipment, sports equipment, LED lamps and lanterns, stage lighting equipment and so on more than 60 industry and other fields.
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