Noise reduction device and range hood

Abstract

The invention provides a noise reduction device and an extractor hood. The noise reduction device comprises a noise reduction cover, wherein the noise reduction cover is arranged in front of a volute of the extractor hood and located above an air inlet of the volute, and filtering holes are formed in the noise reduction cover and used for reducing the noise produced during operation of the extractor hood. The noise reduction device enables the noise produced during operation of the extractor hood to enter the noise reduction cover through the filtering holes formed in the noise reduction cover, a frequency spectrum of the noise is transformed into a high-frequency spectrum or an ultra-high-frequency spectrum due to noise elimination of the small holes when the noise passes through the filtering holes, accordingly audible sound components in the frequency spectrum of the noise are remarkably reduced, interferences and hurts brought to a human body are decreased, further the user experience is improved, and the market competitiveness of a product is improved. In addition, the noise reduction device is arranged in front of the volute of the extractor hood and located above the air inlet of the volute, so that the air inlet of the volute is not blocked, and the air performance of the extractor hood is almost not influenced.

Description

technical field [0001] The invention relates to the technical field of kitchen utensils, in particular to a noise reduction device and a range hood including the noise reduction device. Background technique [0002] With the improvement of the quality of life, users pay more and more attention to the operating noise of range hoods when purchasing range hoods. At the same time, domestic control standards for the operation noise of range hoods have also been improved. However, the high-volume range hoods currently on the market generally have the problem of high noise. In order to reduce the noise generated during the operation of the range hood, manufacturers usually use the method of filling porous sound-absorbing materials, but the porous sound-absorbing materials are not good for medium and high frequencies. The sound effect is good, but the low-frequency noise reduction effect is poor. For example, in the prior art, there is a design to reduce the noise of the range hood...

AI Technical Summary

Problems solved by technology

However, the high-volume range hoods currently on the market generally have the problem of high noise. In order to reduce the noise generated during the operation of the range hood, manufacturers usually use the method of filling porous sound-absorbing materials, but the porous sound-absorbing materials are not good for medium and high frequencies. The sound effect is good, but the low frequency noise reduction effect is poor

For example, in the prior art, there is a design to reduce the noise of the range hood by wrapping the smoke pipe with sound-absorbing material, but this design can reduce the noise of the smoke pipe vibration, but the core noise source of the hood itself is aerodynamic and mechanical vibration. The noise is not significantly reduced, especially for low-frequency noise. The noise reduction effect is not obvious

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