The utility model is a resistive sound absorption and noise reduction principle, which is suitable for medium and high frequency broadband characteristics, stainless steel quick connector is suitable for low and medium frequency characteristics, low and medium frequency characteristics, pulse characteristics, micro perforation and impedance composite muffler. The utility model relates to a device for reducing the air flow noise of a ventilation and air conditioning system by using the principles of sound absorption, reflection and interference. According to the principle of noise elimination, it can be divided into resistance, impedance, resonance and composite.

Based on the measured frequency spectrum characteristic data of noise sources of various types of industrial fans, the main basis for the design of sound absorbers and flow channels is to determine how much noise reduction is required for the fast hose joint in which frequency spectrum range is determined. At the same time, the rectangular channel with narrow surface layer of sound absorption material is used to improve the sound absorption effect.

When the noise source of the fan is at the noise level, its spectrum value is often greater than one, and the requirements of noise reduction amount in different spectrum areas are also different.

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The muffler in the ventilation duct and the muffler of induced draft fan are of impedance acoustic flow pattern. The resistance structure which can suppress the high and medium frequency noise and the resistance structure which can suppress the middle and low frequency noise are adopted. At the same time, two types of sound absorption and silencing areas with high frequency and low frequency are used in the resistance channel, so that the width of the noise elimination frequency band reaches and the sound reduction is good Noise effect.