Abstract: In order to further reduce the noise of range hood and improve user satisfaction. The mechanism of the aerodynamic noise of the range hood is systematically analyzed, and the targeted structural optimization and sound absorption and noise reduction design are carried out. Several technical schemes are verified by experimental tests. The test results show that the noise reduction is 0.6 dB(A) when the box height is increased from 400 mm to 500 mm under the nominal maximum air volume. Volute profile optimization, noise reduction 0.7 dB(A). Impeller eccentricity 135° noise reduction 0.2 dB(A). Optimized air outlet seat, noise reduction of 0.3 dB(A). The height of the box is increased by 80mm, and the noise reduction range is optimized. The perforated plate with a hole diameter of less than 4 mm, together with sound-absorbing materials, has a good sound-absorbing effect on medium and low frequencies, and the noise reduction of the sound-absorbing design is up to 4 dB(A). Through the optimization of the key air duct components of the fan platform and the sound absorption and noise reduction technology, the multi-dimensional coupling noise reduction of the whole machine is realized.

Key words: Range hood, Air duct optimization, Sound absorption and noise reduction