A noiseless exhaust device with dual air ducts based on sound wave interference
An exhaust device and double air duct technology, applied in the direction of noise suppression, ventilation system, space heating and ventilation, etc., can solve problems such as poor ventilation effect, noise of exhaust outlet, noise pollution of fresh air system, etc., and achieve elimination Work noise, wind noise elimination effect
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Embodiment 1
[0035] The invention utilizes the mutual interference effect of sound waves in the transmission process. When the sound waves emitted by two sound sources with the same frequency, the same vibration direction and the same pace are superimposed on each other, the interference phenomenon will occur. If they are in the same phase, the amplitude of the two waves will increase and the sound pressure will be strengthened; on the contrary, their phase is opposite, and the amplitude of the two waves will decrease and the sound pressure will weaken. If the amplitudes of the two waves are the same, they will completely cancel. Due to the interference of sound waves, the sound field in space often has a fixed distribution, forming peaks and valleys. From the frequency response curve, it looks like the effect of a comb filter, that is, the standing wave phenomenon that is often said in sound terms.
[0036] like figure 1 and figure 2 As shown in the figure, the present invention provide...
Embodiment 2
[0052] like Figure 4 As shown in the figure, this embodiment is further improved on the basis of Embodiment 1, the difference is that in this embodiment, a noise-free air exhaust device with dual air ducts based on sound wave interference is provided, and the two air ducts 3 are arranged on each other. Connect the "8"-shaped structure, wherein the thickness of the air duct 3 is a=5mm, the radius r=95mm, the center hole distance of the two air ducts 3 is C2 is 2e, and the numerical range of the e is 55 Odd multiples of ~70mm, the preferred value is: 65mm, and the rotation speed of the fan 6 is selected as 1500 rpm or 2500 rpm, which can reduce or even eliminate noise.
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