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Low-damping half-surrounded three-dimensional sound field noise reduction range hood and noise reduction method thereof

A three-dimensional, low-damping technology, used in the removal of oil fume, heating methods, and household heating, etc., can solve the problems of noise reduction, increase the difficulty of noise reduction in three-dimensional space, and cannot adapt to high-order sound.

Active Publication Date: 2018-11-30
FOSHAN VIOMI ELECTRICAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order acoustic modes
But in three-dimensional space, high-order acoustic modes cannot be ignored, especially in closed large-space pipelines, noise reduction is very difficult and complicated
Usually, a variety of standing waves and a variety of sound waves in different directions interfere with each other and superimpose, which greatly increases the difficulty of noise reduction in three-dimensional space

Method used

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  • Low-damping half-surrounded three-dimensional sound field noise reduction range hood and noise reduction method thereof
  • Low-damping half-surrounded three-dimensional sound field noise reduction range hood and noise reduction method thereof
  • Low-damping half-surrounded three-dimensional sound field noise reduction range hood and noise reduction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] A low-damping semi-enclosed three-dimensional sound field noise reduction range hood, such as Figures 1 to 9 As shown, a hood main body 1 and a three-dimensional sound field noise reduction device 2 are provided, and the three-dimensional sound field noise reduction device 2 is assembled inside the hood main body 1 . The main body 1 of the range hood is provided with a low damping bellows 11 for reducing broadband vibration, and the low damping bellows 11 is assembled inside the main body 1 of the range hood. The ventilation assembly 12 of the main body of the hood 1 is located inside a semi-enclosed structure with at least two fully open structural surfaces consisting of a low-damping air box 11 .

[0091] The semi-enclosed structure can optimize the performance of the hood, but at the same time complete the work under low-noise operation, and solve the technical difficulties of the contradiction between noise and performance. Without sacrificing the performance of th...

Embodiment 2

[0117] A low-damping semi-enclosed three-dimensional sound field noise reduction range hood, other features are the same as in Embodiment 1, the difference is that the outer surface of the low-damping bellows 11 of this embodiment is equipped with a foam board.

[0118] It should be noted that the outer surface of the low-damping bellows 11 of the present invention may be equipped with a foam board, or any one of a foam board or a rubber board.

[0119] The role of the foam board, foam board or rubber board is to block the noise from spreading to the outside, thereby reducing the noise level.

[0120] Compared with Embodiment 1, the noise reduction effect of the range hood of this embodiment is better.

Embodiment 3

[0122] A low-damping semi-enclosed three-dimensional sound field noise reduction range hood, the noise reduction frequency range of the three-dimensional sound field noise reduction device 2 is 100Hz-2000Hz.

[0123] It breaks through the limitation of the existing technology that active noise reduction can only reduce noise within 1000Hz, and effectively reduces noise to a maximum noise frequency domain of 2000Hz.

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Abstract

The invention discloses a low-damping half-surrounded three-dimensional sound field noise reduction range hood and a noise reduction method thereof. The range hood is provided with a range hood main body and a three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device is assembled in the range hood main body. The low-damping half-surrounded structure of the range hood makes incoming waves and reflected waves have different phases at a specific distance to a reflection plane in order to mutually offset sound waves of noises, sothe intensity of the noises is reduced. The arrangement of a three-dimensional space sound field noise reduction unit and a self-adaption three-dimensional space sound field noise reduction control unit ensures that the range hood works under optimal performance conditions while achieving low noises, so the technical difficulty of the mutual contradiction between noises and performances is solved, low noises during running of the range hood and no physiologic and mental negative influences on users are achieved without sacrificing the smoke suction performance of the range hood, and a most effective noise reduction effect and an effective noise reduction space range are obtained.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a low-damping semi-enclosed three-dimensional sound field noise reduction range hood and a noise reduction method. Background technique [0002] The current active noise reduction technology, such as the application of earphones, is a point-to-point noise reduction technology, that is, directional noise reduction, which cannot effectively eliminate noise in a large range. These techniques focus on eliminating one-dimensional plane sound waves in closed small ducts or small spaces, and are effective in the low frequency range (less than 500Hz). In order to achieve low noise, the current range hoods generally directly set low air volume, that is, sacrifice the performance of the range hood to achieve low noise, but the effect of the range hood is greatly reduced; Noise reduction device, but its active noise reduction can only reduce noise within 1000Hz, and cannot adapt to high-order so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24C15/20
CPCF24C15/2021F24C15/2035Y02B30/70
Inventor 林勇进李健鹏李思成
Owner FOSHAN VIOMI ELECTRICAL TECH
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