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Method for obtaining noise interference device of smoke hood

An acquisition method and a technology for a range hood, which are applied in the fields of oil fume removal, sound-producing equipment, heating methods, etc., can solve the problems of difficulty in selecting sound-absorbing cotton, large air pressure loss, and sound-absorbing cotton can not have a large noise reduction effect.

Active Publication Date: 2019-02-22
FOSHAN VIOMI ELECTRICAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for obtaining noise interference device of smoke hood
  • Method for obtaining noise interference device of smoke hood
  • Method for obtaining noise interference device of smoke hood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for obtaining a noise interference device for a range hood. The range hood is provided with a hood body and a noise interference device 1 for reducing multi-frequency noise. The noise interference device 1 is assembled on the hood body.

[0045] 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.

[0046] The acquisition method includes the following steps, such as figure 1 Shown:

[0047] Step 1. Obtain the frequency f of the fan blades of the range hood F ;

[0048] Step 2. According to the fan blade generation frequency f obtained in step 1 F , to obtain the first main frequency f of the target noise reduction frequency of the noise interference device 1 0,1 ;

[0049] Step 3. According to the first main frequency f obtained ...

Embodiment 2

[0082] A method for obtaining a range hood noise interference device, such as Image 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.

[0083] 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 It can be a single value or multiple values, the specific L a and the number of ΔL values ​​depends on the actual situation. ΔL may be a single value or multiple values. L in this instance a and ΔL respectively specify a plurality of different values.

[0084] It should be noted that, according to formula (Ⅲ) It can be seen that for the same f 0,1 , L a and ΔL values ​​are not unique. Th...

Embodiment 3

[0087] A method for obtaining a range hood 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.

[0088] 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 method for obtaining a noise interference device of a smoke hood. The smoke hood comprises a main smoke hood body and a noise interference device used for reducing the broadband frequency noise, wherein the noise interference device is assembled on the main smoke hood body. The noise interference device is provided with two openings, and the openings are in different horizontal positions and correspondingly communicate with a main air duct of the main smoke hood body. The method for obtaining the noise interference device of the smoke hood includes four steps that thefirst main frequencies f0 and f1 of a target noise reduction frequency of the noise interference device are only calculated according to the frequency fF which is generated by the fan blade, so thatthe parameters of La, delta L and C of the noise interference device are obtained, and after La, delta L and C are determined, the first main frequency f0 and f1, the second main frequency f0 and f2,the first noise reduction subharmonic frequency fS1 and the second noise reduction subharmonic frequency fS2 of the noise interference device can be obtained. Due to the noise interference device, thenoises having the same frequency as the aforementioned noises can be counteracted, and the purpose of the broadband frequency reduction is achieved.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a method for obtaining a noise interference device for range hoods. 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 pipe with sound-abs...

Claims

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Application Information

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IPC IPC(8): F24C15/20G10K11/175G10K11/16
CPCF24C15/2021G10K11/161G10K11/175
Inventor 陈小平林勇进
Owner FOSHAN VIOMI ELECTRICAL TECH