Combined frequency-conversion acoustic tile

Abstract

The invention provides a combined frequency-conversion acoustic tile and belongs to the technical field of daily necessities. The present single sound absorption material is unable to insulate noise within 20-1400Hz and the frequency domain of sound absorption peak value is fixed. The combined frequency-conversion acoustic tile provided by the invention is characterized in that a cavity is provided by a chamber on the rear side of a perforated plate; a porous sound absorption plate is arranged on the rear side of the cavity; the perforated plate, the chamber and the porous sound absorption plate are in identical length and width size; a cavity regulating part is composed of a push-pull rod and an adjusting plate; the adjusting plate is located in the cavity; the adjusting plate is parallelto the perforated plate; an edge of the adjusting plate is in moveable fit with an inner wall of the cavity; the push-pull rod is penetrated through the porous sound absorption plate and is connectedwith the adjusting plate. On the basis of having a low-mid frequency basic sound absorption effect, the combined frequency-conversion acoustic tile is capable of changing the position of the absorption peak value domain by adjusting the size of the cavity matched with the perforated plate, so that the invasion of noises in different frequency bands can be effectively tackled and the outdoor noisewithin the scope of 20-1400Hz can be prevented from entering into a room from doors and windows.

Description

technical field [0001] The invention relates to a combined frequency conversion sound-absorbing brick, which belongs to the technical field of daily necessities. Background technique [0002] In daily life, the noise that can enter the room from the outside through doors and windows can be classified into three types: construction noise, generated by cranes, vibrators, grinding wheels, etc.; traffic noise, from vehicle cylinders, exhaust pipes, tires, horns, etc. Etc. Noise from human activities, including square dance music, the sound of vendors hawking, and the sound of elevators running in buildings. These noises will not only affect people's work and rest, but also cause permanent damage to body organs in severe cases. The various noises have different sound pressure levels and different sound wave frequencies, which are distributed in the range of 20-1400 Hz. [0003] Porous sound-absorbing material is a kind of foaming or fluffy material, which can effectively absorb...

AI Technical Summary

Problems solved by technology

[0003] Porous sound-absorbing material is a kind of foam or fluffy material, which can effectively absorb medium and high-frequency noise from 1000 to 6000 Hz, but absorbs little low-frequency noise.

Micro-perforated plate is a plate-shaped sound-absorbing material distributed with micro-holes with a diameter of less than 1 mm. Although it can effectively absorb low-frequency noise below 1000 Hz, the absorption peak frequency domain with a sound absorption coefficient greater than 0.8 is only 150 Hz. The structure of the micro-perforated plate and the size of the cavity matched with it are determined, and the position of its absorption peak frequency domain in the noise frequency band is also determined, such as in the 850-1000Hz frequency band, and the construction noise, traffic noise, human activity noise, etc. The positions of the low-frequency parts in the low-frequency noise frequency band are different, and the absorption peak frequency domain of the micro-perforated plate is even more different. Therefore, the micro-perforated plate with a fixed structure is difficult to deal with various low-frequency noises that are widely distributed.

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