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

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...

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

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