Microhole plate sound absorption grating

Abstract

The invention relates to a microhole plate sound absorption grating. The microhole plate sound absorption grating comprises a plurality of sound absorption pieces which are arranged on a bottom plate side by side, and the bottom plate is mounted on an air inlet of a smoke exhaust through a connecting frame; each sound absorption piece is of a strip-shaped cavity structure and comprises a microhole plate and a back plate which are oppositely located on the two sides, side plates are in transition connection between each microhole plate and the corresponding back plate, and the side plates at the upper end and the lower end of each sound absorption piece are provided with arc curve structures; a cavity is defined by each microhole plate, the corresponding back plate and the corresponding side plates, and micro holes are evenly distributed in each microhole plate; structural parameters of the microhole plates are designed on the basis of the Helmholtz resonator principle of small holes and the sound absorption theory of perforated plates, the plate thickness is 0.8 mm, the diameter d of the micro holes is 0.8 mm, the perforated percentage is 1%, and the cavity thickness D of the sound absorption pieces is 15 mm. The microhole plate sound absorption grating has the beneficial effects of being fireproof, good in sound absorption effect and convenient to mount, dismount and wash and preventing lampblack.

Description

technical field [0001] The invention relates to the technical field of range hoods, in particular to a noise reduction technology for range hoods. Background technique [0002] Low noise is one of the main highlights of range hood products in recent years. In addition to the low-noise design and flow diversion measures of the impeller volute system, the application of sound-absorbing materials is also a method that is gradually adopted. The current range hood products generally use sound-absorbing cotton plus a perforated plate lining to be installed in the range hood shell as the sound-absorbing component. Since the range hood has a large amount of oil fumes and oil stains when it is in use, the surface of the sound-absorbing cotton is easily blocked by oil stains. Its sound-absorbing performance is greatly reduced, and the sound-absorbing cotton is often unable to be cleaned, and its service life is short; in addition, due to space constraints, the thickness of the sound-a...

AI Technical Summary

Problems solved by technology

The current range hood products generally use sound-absorbing cotton plus a perforated plate lining to be installed in the range hood shell as the sound-absorbing component. Since the range hood has a large amount of oil fumes and oil stains when it is in use, the surface of the sound-absorbing cotton is easily blocked by oil stains. Its sound-absorbing performance is greatly reduced, and the sound-absorbing cotton is often unable to be cleaned, and its service life is short; in addition, due to space constraints, the thickness of the sound-absorbing material that can be installed in the range hood shell is very small (generally no more than 20mm), and its The sound absorption frequency band is concentrated in the middle and high frequency bands above 1000Hz, while the noise frequency of the range hood is mainly concentrated between 500 and 2000Hz, so the sound absorption effect of the sound-absorbing cotton on the middle and low frequencies is not good.

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