The centrifugal blower with similar performance has a larger noise level than the axial flow fan, and the air volume and pressure of the same series of fans increase, and the noise is also large. Cars not only waste electrical energy, but also increase noise. When the same fan is running, its sound level also changes with the working conditions. Generally speaking, the rated working point (the highest point of fan efficiency) is the lowest sound level. Therefore, when the fan must match the process conditions and pipe network operating system , In order to get the lowest noise of the fan.
The inlet of the fan should not be in the rapidly changing flow field, which will produce eddy current, which will reduce the performance of the fan and the noise will rise sharply. If the inlet duct of the fan is turned too sharply, eddy current will also appear. When there are multiple pipe fittings in the system, such as elbows, reducer pipes, etc., and the distance between them is too close, the secondary noise at the second pipe fitting will increase Open 5 to 10 times the pipe diameter distance. When the vibration of the casing and the pipeline is too large, in order to prevent cavity resonance, the pipeline fan should be strengthened to increase rigidity and reduce vibration efficiency.
Considering the directivity, that is, changing the direction of the sound source, the outlet pipe of the fan is preferably directed away from the residential and noisy areas of the population. For heavy machinery and equipment, the noise pollution of civil industrial fan systems and the noise control measures of the prevention and control structure should be adopted, for example, the construction of noise reduction walls and so on. Reasonably adopt measures such as sound barrier, sound absorption, muffler, sound insulation, vibration reduction, vibration isolation, soft connection between fan and pipeline, combined with the specific situation, find the best solution.
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