Product advantages:
1. It adopts high-efficiency and low-noise curved and swept double-sided combination airfoil blades jointly developed with Northwestern Polytechnical University (Patent No.: ZL2018 2 1352322.2). It has two technical features:
① The efficiency is as high as 70~75% or more;
② The noise level is the same as that of similar products It is about 5-8 decibels lower than that.
2. Based on the use of advanced blade shapes, physical noise reduction is carried out, and the original direct air intake method is changed at the front end of the fan inlet. By making a square inlet silencer collector assembly and built-in guide vane partitions, the inlet air flow is changed. To enter the fan vertically and evenly;
3. Add a front silencer assembly with three built-in silencer inserts. The air flow enters the silencer and is reflected and rubbed in the pores of the porous material, further weakening the sound waves, thereby further reducing noise.
4. Silencing diffuser, by lengthening the rear air outlet silencer diffuser, further absorbing noise and improving the efficiency of the whole machine.
5. The main casing has a fully covered structure. Most local fans use 2-stage motors. The motor noise is generally above 93 decibels. Our company has a targeted full-covered silencing structure for the main casing of the fan, especially the rotating part of the impeller. Double layers of thicker sound-absorbing cotton are laid inside the double-layer steel plate to block noise leakage.
6. The company invited experts in noise elimination and noise reduction to conduct spectrum analysis of the noise generated by the fan during operation, and measured the frequency bands of the main noise in each part of the fan. Ultra-fine glass fiber sound-absorbing cotton with different bulk density was used for coating and external application. Sound-attenuating perforated plate, and then specifically adjust the hole size, hole spacing, and perforation rate of the sound-absorbing orifice plate to design the optimal frequency absorption size to achieve better sound absorption effect.
Through all-round noise reduction treatment of local ventilators, our company's products reduce noise by 20-30dB compared with ordinary counter-rotating local ventilators. The noise of the ventilator is tested at a distance of 1 meter from the fan air inlet and the rotating part of the fan impeller. ≤85dB
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