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A Broadband Noise Reduction Method for Range Hood with Noise Interference Device
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A range hood, noise technology, applied in the field of broadband noise reduction, can solve the problems of large air pressure loss, difficulty in selecting sound-absorbing cotton, and uncontrollable noise-reducing frequency of sound-absorbing cotton
Active Publication Date: 2020-08-14
FOSHAN VIOMI ELECTRICAL TECH +1
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Problems solved by technology
However, there are several disadvantages as follows: 1. The air pressure loss is too large, noise and fluid need to pass through the sound-absorbing cotton, and use friction to consume sound energy to achieve the effect of noise reduction, but at the same time reduce the performance of the air
2. It is difficult to choose suitable sound-absorbing cotton. Few suppliers can provide data on the sound-absorbing rate of sound-absorbing cotton at different frequencies. Therefore, manufacturers of range hoods can only find out the appropriate type of sound-absorbing cotton through continuous trial and error. or thickness etc.
3. The noise reduction frequency of sound-absorbing cotton is uncontrollable. For common sound-absorbing cotton, it cannot achieve the maximum noise reduction effect at a specified narrow frequency, and it is impossible to match different strategies from the design to achieve more effective noise reduction.
Method used
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Embodiment 1
[0060] A broadband noise reduction method for a range hood with a noise interference device. The range hood is provided with a hood main body and a noise interference device 1, and the noise interference device 1 is assembled on the hood main body.
[0061] The resonance frequency of the noise interference device 1 overlaps with the wide-frequency noise wave generated when the range hood is running.
[0062] Such as Figures 2 to 5 As shown, the noise interference device 1 is provided with two openings, the two openings communicate with the main air duct 2 of the smoke machine body respectively and the horizontal positions of the two openings are different as image 3 K 1 K 2 shown.
[0063] The wide-frequency noise wave propagates in the main air duct. When encountering the noise interference device 1, the wide-frequency noise wave is divided into the first wide-frequency noise wave and the second wide-frequency noise wave, and the first wide-frequency noise wave continues...
Embodiment 2
[0104] A broadband noise reduction method for range hoods with noise interference devices, such as Figure 6 As shown, other features are the same as in Embodiment 1, the difference is: the noise interference device 1 of the range hood of the present invention can also be set to a plurality, such as 2, 4, 10, 500 or 10000, etc., The specific noise interference device 1 depends on the actual situation. The specificity of the present embodiment is 4.
[0105] In the range hood of the present invention, C may be a single value or a plurality of values for a plurality of noise interference devices 1 . L a Can be a single value or multiple values. ΔL can be a single value or multiple values, the specific L a and the number of ΔL values depends on the actual situation. L in this example a and ΔL each have a number of different values.
[0106] It should be noted that, according to formula (Ⅲ) It can be seen that for the same f 0,1 , L a The values of and ΔL are not ...
Embodiment 3
[0109] A broadband noise reduction method for a range hood with a noise interference device, other features are the same as in Embodiment 1, the difference is: the L of this embodiment a Specifically, it is 10 cm, ΔL is specifically 3 cm, and C is 0.18 cm.
[0110] The phase difference of the present invention may be 150°-180°. When the phase difference is 180°, the interference effect is the best.
[0111] Compared with Embodiment 1, the L of the noise interference device 1 of this embodiment a , ΔL, and C, the range hood with the noise interference device 1 has the advantage of good noise reduction.
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Abstract
The invention discloses a broadband noise reduction method for a smoke hood with a noise interference device. The smoke hood comprises a main smoke hood body and a noise interference device, wherein the noise interference device is fitly arranged on the main smoke hood body. The noise interference device can be designed according to the frequency which is generated by fan blades of the smoke hood,so that the noise interference device with a resonance frequency as a first main frequency f0 and f1, a second main frequency f0 and f2, a first noise reduction subharmonic frequency fS1, and a second noise reduction subharmonic frequency fS2 is obtained, therefore the same noise as the aforementioned resonance frequencies can be counteracted by the noise interference device. Meanwhile, because the noise wave enters the noise interference device, when the noise wave leaves the noise interference device, an interference wave have a phase difference with the noise wave of a main air channel isformed, and the amplitude of the remaining noise wave can be weaken or reduced by the interference wave. Therefore, due to the noise interference device, a broadband frequency noise wave can be reduced, and the noise reduction effect of the broadband frequency noise wave achieves a maximum.
Description
technical field [0001] The invention relates to the field of range hoods, in particular to a broadband noise reduction method for a range hood with a noise interference device. Background technique [0002] Long-term exposure to high-noise environments can damage people's hearing, and long-term exposure to high-noise environments can also cause emotional problems for users. With the improvement of people's quality of life, people's tolerance to noise is getting lower and lower. Therefore, the noise reduction of range hoods has also received more and more attention. [0003] The noise reduction of range hoods in the prior art mostly achieves noise reduction through active noise reduction and passive noise reduction. The active noise reduction method can only act on the noise with a frequency within 1000Hz, and the noise above 1000Hz can only be processed by passive noise reduction technology. However, passive noise reduction is mainly done by wrapping the noise source or p...
Claims
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Application Information
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