CN220821086U - Multilayer perforation sound absorption structure - Google Patents

Abstract

The utility model discloses a multilayer perforation sound absorption structure, which relates to the field of sound absorption structures, and comprises a substrate which is constructed into a cross arrangement structure, wherein a first through hole and a second through hole are formed in the substrate, a resonance film for generating self-vibration frequency is paved on one side of the substrate, and the resonance film seals the first through hole and the second through hole; a partition board is arranged on the other side of the substrate, and a cavity communicated with the first through hole is formed between the partition board and the substrate; the sound absorption plate is arranged on one side of the film, which is opposite to the base plate, the baffle is fixedly connected with the sound absorption plate, the baffle and the resonance film are provided with resonance cavities, and the sound absorption plate corresponding to the resonance cavities is provided with a plurality of sound absorption holes; the first and second through holes allow the resonance film in the resonance chamber to have a first vibration portion and a second vibration portion. The resonant film in the resonant cavity is provided with the first vibration part and the second vibration part, so that self-vibration waves in multiple directions can be effectively generated to offset the radial transmission sound waves.

Description

Multilayer perforation sound absorption structure

Technical Field

The utility model relates to the field of sound absorption structures, in particular to a multilayer perforation sound absorption structure.

Background

The perforated sound absorbing material of the multilayer has poor sound absorbing performance on low-frequency sound, so that the resonance sound absorbing principle (the nuclear-Hotz resonance principle) is often adopted to solve the problem of low-frequency sound absorption, thereby achieving the sound insulation effect. It has strong decorative property, enough strength and easy control of sound wave, so it can be widely used in building.

The existing porous sound absorption structure, such as patent CN210271770U, is coupled with the resonant cavity through the non-perforated film in the perforation of the cotton felt, and provides natural vibration frequency with opposite direction and equal frequency to the sound wave of the sound source for the resonant cavity, so as to eliminate the transmission process of the sound. However, since the sound wave is transmitted radially from the multiple perforations to the vibrating membrane of the resonant cavity, the natural frequency of the non-perforated membrane is difficult to eliminate the transmission of the sound, and the sound insulation effect is poor.

Disclosure of utility model

In order to solve the problems in the prior art, the utility model provides a multilayer perforated sound absorption structure, wherein a resonant film in a resonant cavity is provided with a first vibration part and a second vibration part, and can effectively generate self-vibration waves in multiple directions to offset radial transmission sound waves.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a multilayer perforation sound absorption structure comprises a substrate which is in a cross arrangement structure, wherein a first through hole and a second through hole are formed in the substrate, a resonance film for generating self-vibration frequency is paved on one side of the substrate, and the resonance film is used for sealing the first through hole and the second through hole; a partition board is arranged on the other side of the substrate, and a cavity communicated with the first through hole is formed between the partition board and the substrate;

The sound absorption plate is arranged on one side of the film, which is back to the base plate, the sound absorption plate is fixedly connected with a baffle plate, the sound absorption plate, the baffle plate and the resonance film are provided with resonance cavities, and the sound absorption plate corresponding to the resonance cavities is provided with a plurality of sound absorption holes;

The first through hole and the second through hole enable the resonance film in the resonance cavity to be provided with a first vibration part and a second vibration part;

Further, the resonant cavity is of a cuboid structure, and sound absorption holes in the sound absorption plate are distributed along the length direction of the resonant cavity.

The utility model has the beneficial effects that: the resonance film in the resonance cavity is provided with the first vibration part and the second vibration part, the first vibration part and the second vibration part can effectively generate self-vibration waves in multiple directions to offset radial transmission sound waves entering from the sound absorption holes, and the transmission of the sound waves of the sound source can be effectively blocked, so that the sound absorption film has a good sound insulation effect as a sound insulation wall. Meanwhile, the base plate, the baffle plate, the sound absorbing plate and the resonance film are arranged in a layered structure, the processing technology is simple, the sound absorbing material with the sound absorbing structure is easy to produce and manufacture, and the sound absorbing material has good application prospect.

Drawings

FIG. 1 is a schematic view of the overall structure of a multilayer perforated sound absorbing structure;

FIG. 2 is a top view of a multilayer perforated sound absorbing structure;

fig. 3 is a cross-sectional view taken along the direction A-A in fig. 2.

Reference numerals illustrate: 100. a substrate; 101. a first through hole; 102. a second through hole; 200. a partition plate; 300. a resonance film; 301. a first vibration part; 302. a second vibration part; 400. a sound absorbing panel; 401. a sound absorption hole; 402. a baffle; 500. a cavity; 600. a resonant cavity.

Detailed Description

In order to make the object technical scheme and the beneficial effects of the present utility model clearer, the following detailed description of the preferred embodiments of the present utility model will be given with reference to the accompanying drawings, so as to facilitate understanding of the skilled person.

Referring to fig. 1 to 3, a multi-layered perforated sound absorbing structure mainly includes a base plate 100 constructed in a cross-shaped arrangement structure, so that the base plate 100 is easily combined with a partition plate 200, a sound absorbing plate 400, which will be described later, to construct a cavity 500 and a resonance cavity 600 in a layered stack, simplifying the manufacturing process of the sound absorbing structure.

As shown in fig. 1 and 3, a first through hole 101 and a second through hole 102 are provided on a substrate 100, a resonance film 300 for generating a self-vibration frequency is laid on one side of the substrate 100, and the resonance film 300 seals the first through hole 101 and the second through hole 102, so that the resonance film 300 forms a first vibration part 301 and a second vibration part 302 at the first through hole 101 and the second through hole 102, and the first vibration part 301 and the second vibration part 302 can effectively generate self-vibration waves in multiple directions, that is, the resonance film 300 can vibrate along the hole length directions of the first through hole 101 and the second through hole 102, and counteracts sound waves entering a resonance cavity 600 from a sound absorption hole 401 described below. The partition 200 provided at the other side of the substrate 100 and the substrate 100 are configured with a cavity 500 communicating with the first through hole 101, providing an amplitude space or amplitude range of the first vibration part 301, so that the first vibration part 301 can generate a wider vibration frequency than the range for canceling out the sound wave of the sound source.

As shown in fig. 3, a sound absorbing plate 400 is disposed on a side of the film facing away from the substrate 100, the sound absorbing plate 400 is fixedly connected with a baffle 402, the sound absorbing plate 400, the baffle 402 and the resonant film 300 are configured with a resonant cavity 600, and the sound absorbing plate 400 corresponding to the resonant cavity 600 is provided with a plurality of sound absorbing holes 401, so that a sound source can enter the resonant cavity 600 from the sound absorbing holes 401 to excite the resonant cavity 600 to emit resonant frequencies. In some preferred embodiments, the resonant cavity 600 has a rectangular parallelepiped structure, and the sound absorbing holes 401 of the sound absorbing plate 400 are arranged along the length direction of the resonant cavity 600, so that the effect of the resonant cavity 600 against the sound wave of the sound source is improved, and the sound transfer resistance is improved.

The working principle of the utility model is as follows: when the sound source sounds, the structure is installed, the sound absorbing board 400 faces to one side of the sound source, sound waves are transmitted into the resonant cavity 600 from the sound absorbing holes 401, and the resonant film 300 on the resonant cavity 600 is excited to emit resonant frequencies to couple with the sound waves, and the resonant frequencies interact with the sound wave frequencies of the sound source to counteract or block the transmission process of the sound. The utility model eliminates the transmission of the blocking sound according to the nuclear Hotz resonance principle, and meanwhile, the structure is convenient for manufacturing and forming, thereby simplifying the production process of the utility model.

Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the utility model, and that, although the utility model has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the utility model as defined by the appended claims.

Claims (2)

1. A multilayer perforated sound absorbing structure characterized by: the device comprises a substrate (100) which is in a cross arrangement structure, wherein a first through hole (101) and a second through hole (102) are formed in the substrate (100), a resonance film (300) for generating self-oscillation frequency is paved on one side of the substrate (100), and the resonance film (300) is used for sealing the first through hole (101) and the second through hole (102); a baffle plate (200) is arranged on the other side of the base plate (100), and a cavity (500) communicated with the first through hole (101) is formed between the baffle plate (200) and the base plate (100);

The sound absorption device is characterized in that a sound absorption plate (400) is arranged on one side of the film, which is opposite to the base plate (100), the sound absorption plate (400) is fixedly connected with a baffle plate (402), a resonant cavity (600) is formed by the sound absorption plate (400), the baffle plate (402) and the resonant film (300), and a plurality of sound absorption holes (401) are formed in the sound absorption plate (400) corresponding to the resonant cavity (600);

The first through hole (101) and the second through hole (102) enable the resonance film (300) in the resonance cavity (600) to be provided with a first vibration part (301) and a second vibration part (302).

2. The multilayer perforated sound absorbing structure of claim 1 wherein: the resonant cavity (600) is of a cuboid structure, and sound absorption holes (401) in the sound absorption plate (400) are distributed along the length direction of the resonant cavity (600).