Sound absorption structure of air channel

Abstract

The invention belongs to the technical field of air-cooled refrigerator air channel noise reduction and discloses a sound absorption structure of an air channel. The structure comprises two or more layers of thin plates which are fixed to the inner side of an air channel wallboard in sequence from outside to inside, cavities are reserved between every two adjacent thin plates and between each thin plate and the air channel wallboard respectively, and each thin plate is provided with through holes used for communicating the cavity at the inner side of the thin plate with the cavity at the outer side of the thin plate. According to the sound absorption structure of the air channel, due to the fact that the plates are thin and hole diameters are small, the acoustic resistance of the air channel is larger than that of a conventional perforated plate, the mass is small, and therefore structure of the air channel is better than the structure of the conventional perforated plate in effect regarding the acoustic absorption coefficient and the frequency band. The sound absorption structure of the air channel is constituted by the two or more layers of thin plates, therefore the frequency band is widened and moves toward the low frequency, as air channel noise is usually located in the low frequency band, the sound absorption frequency band is wide, the sound absorption effect in the medium and low frequency band is good, and the air channel noise can be effectively reduced. On the whole, the sound absorption structure of the air channel is low in cost, wide in sound absorption frequency band and high in sound absorption coefficient.

Description

technical field [0001] The invention relates to the technical field of air duct noise reduction for air-cooled refrigerators, in particular to an air duct sound-absorbing structure. Background technique [0002] The popularity of air-cooled refrigerators is increasing day by day, but the noise of the air duct is one of its major disadvantages. The traditional way to reduce air duct noise is to attach sound-absorbing materials to the inner side of the air duct wall. Big disadvantage: [0003] 1. The noise frequency band of the air duct is wide, while the sound absorption frequency band of the sound-absorbing material is narrow. Only by attaching the sound-absorbing material to the wall of the air duct, the overall sound absorption and noise reduction effect is not good; [0004] 2. The area of ​​the air duct wall plate is large, the amount of sound-absorbing material is large, and the cost of noise reduction and noise reduction is high. Contents of the invention [0005]...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the noise reduction of the air duct of the existing air-cooled refrigerator, the method of attaching sound-absorbing materials to the wall plat

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