A modular sound absorbing structure

Abstract

The utility model belongs to the field of noise reduction technology discloses a kind of modular sound absorption structure, comprising: micro-perforated panel, micro-perforated panel rear upper and lower sides are respectively equipped with a group of rigid frame, and the rear of rigid frame is equipped with elastic backboard, and elastic backboard is bonded with rigid frame by viscoelastic material layer, cavity is formed between elastic backboard and micro-perforated panel, and sound-absorbing cotton is placed in cavity, and elastic backboard rear is equipped with constraint combination layer, compared with prior art, the utility model has the beneficial effects as follows: the through hole of micro-perforated panel is matched with cavity, and the absorption of medium-high frequency noise is enhanced;Cavity is combined with sound-absorbing cotton, improve low-frequency sound absorption capacity, realize broadband noise reduction, simultaneously, elastic backboard and viscoelastic material layer, constraint combination layer cooperate, through vibration damping and energy conversion, further improve the efficiency of noise reduction.

Description

Technical Field

[0001] This utility model specifically relates to a modular sound-absorbing structure, belonging to the field of noise reduction technology. Background Technology

[0002] In acoustic environment management, sound-absorbing structures are a key technical means to reduce environmental noise. They are widely used in industrial plants, transportation hubs, building interiors and other scenarios. The core of these structures is to convert sound energy into other forms of energy through material and structural design, thereby reducing sound wave reflection and improving the sound field environment. However, existing sound-absorbing structures have many shortcomings, resulting in poor sound absorption and noise reduction effects.

[0003] Existing structures mostly use a single glass fiber sound-absorbing cotton for sound absorption, lacking layered optimization design. They have limited ability to handle broadband noise, are prone to high-frequency reflection and difficult to absorb low-frequency sound, and have a "low-frequency blind zone". Furthermore, they are weak in adapting to complex sound fields, and their performance drops significantly when sound waves are incident obliquely. They cannot absorb scattered sound waves a second time, resulting in unsatisfactory noise reduction effects.

[0004] To address the aforementioned issues, this application proposes a modular sound-absorbing structure. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a modular sound-absorbing structure. The through holes and cavities of the micro-perforated plate work together to enhance the absorption of mid-to-high frequency noise. The cavity is combined with sound-absorbing cotton to improve low-frequency sound absorption and achieve broadband noise reduction. At the same time, the elastic back plate works in conjunction with the viscoelastic material layer and the constraint combination layer to further improve noise reduction efficiency through vibration damping and energy conversion, thus solving the problems mentioned in the background technology.

[0006] A modular sound-absorbing structure includes: a micro-perforated plate, a set of rigid frames installed on the upper and lower sides of the micro-perforated plate, an elastic back plate provided behind the rigid frames, and the elastic back plate and the rigid frames are bonded together by a viscoelastic material layer, a cavity is formed between the elastic back plate and the micro-perforated plate, sound-absorbing cotton is placed in the cavity, and a constraint assembly layer is provided behind the elastic back plate.

[0007] In a preferred embodiment, the surface of the micro-perforated plate has multiple sets of through holes of 0.3mm-0.4mm, and the micro-perforated plate is made of aluminum plate with double-sided powder coating.

[0008] In a preferred embodiment, the rigid frame has an opening for taking out and putting in, and the sound-absorbing cotton is filled into the cavity through the opening.

[0009] In a preferred embodiment, the sound-absorbing cotton is made of glass fiber material, and its surface is wrapped with a fabric layer to prevent the ultrafine fibers in the sound-absorbing material from escaping and sticking to the skin.

[0010] In a preferred embodiment, the fabric layer is glass fiber cloth.

[0011] In a preferred embodiment, the constraint combination layer includes a damping layer, and a set of metal plates one and two are respectively provided on both sides of the damping layer.

[0012] In a preferred embodiment, the damping layer is made of butyl rubber, and adhesive is sprayed onto both sides of the damping layer.

[0013] In a preferred embodiment, the first metal plate and the second metal plate are bonded to the damping layer by a pressure plate, and the first metal plate and the second metal plate are aluminum plates.

[0014] In a preferred embodiment, the elastic back plate is bonded to the metal plate via an adhesive layer.

[0015] Beneficial effects: 1. In terms of sound absorption and noise reduction, the through holes and cavities of the micro-perforated plate enhance the absorption of mid-to-high frequency noise; the combination of the cavity and sound-absorbing cotton improves the low-frequency sound absorption capability and achieves wide-band noise reduction. At the same time, the elastic back plate, viscoelastic material layer and constraint combination layer work together to further improve the noise reduction efficiency through vibration damping and energy conversion. Compared with the existing single glass fiber sound-absorbing cotton design, it solves the shortcomings in wide-band coverage and adaptability to complex sound fields, and significantly improves the sound absorption and noise reduction effect.

[0016] 2. The design of the access port provides a convenient channel for replacing the sound-absorbing cotton, allowing maintenance to be completed without disassembling the overall structure, which greatly improves the efficiency of later maintenance; the sound-absorbing cotton is wrapped with fiberglass cloth, which on the one hand effectively prevents the ultra-fine fibers from escaping through physical barrier, avoiding sticking and irritation to human skin, and on the other hand, its own breathable characteristics will not hinder sound waves from entering the sound-absorbing cotton, ensuring that the acoustic performance of the sound-absorbing material is not affected, thus taking into account both the safety of use and the stability of the sound absorption effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a modular sound-absorbing structure according to the present invention; Figure 2 This is a schematic diagram of the modular sound-absorbing structure of this utility model from another perspective; Figure 3 This is a third-view structural schematic diagram of a modular sound-absorbing structure according to the present invention; Figure 4 This is a cross-sectional schematic diagram of a modular sound-absorbing structure according to the present invention; Figure 5 for Figure 3 A schematic diagram of the structure for placing sound-absorbing cotton.

[0018] In the diagram, 1 is a micro-perforated plate; 11 is a through hole; 2 is a rigid frame; 3 is a viscoelastic material layer; 4 is an elastic back plate; 5 is an adhesive layer; 6 is a constraint combination layer; 61 is a damping layer; 62 is a metal plate one; 63 is a metal plate two; 7 is a cavity; 8 is an opening for taking out and putting in; and 9 is sound-absorbing cotton. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-5 As shown, a modular sound-absorbing structure includes: a micro-perforated plate 1, a set of rigid frames 2 installed on the upper and lower sides of the micro-perforated plate 1, an elastic back plate 4 provided behind the rigid frames 2, and the elastic back plate 4 and the rigid frames 2 are bonded together by a viscoelastic material layer 3. A cavity 7 is formed between the elastic back plate 4 and the micro-perforated plate 1, and sound-absorbing cotton 9 is placed in the cavity 7. A constraint combination layer 6 is provided behind the elastic back plate 4. Through the coordinated cooperation of the micro-perforated plate 1, the rigid frames 2, the elastic back plate 4, the viscoelastic material layer 3, the cavity 7, the sound-absorbing cotton 9 and the constraint combination layer 6, a complete modular sound-absorbing system is formed, forming a layered sound-absorbing structure, and realizing the stepwise absorption of noise in different frequency bands.

[0021] Please see Figures 1-2 As shown, the surface of the micro-perforated plate 1 has multiple sets of through holes 11 with a diameter of 0.3mm-0.4mm. The micro-perforated plate 1 is made of aluminum plate and has double-sided powder coating treatment. Double-sided powder coating treatment enhances corrosion resistance and extends service life.

[0022] Please see Figures 1-5 As shown, a loading and unloading port 8 is provided above the rigid frame 2, and the sound-absorbing cotton 9 is filled into the cavity 7 through the loading and unloading port 8. The loading and unloading port 8 facilitates the installation, replacement and maintenance of the sound-absorbing cotton 9, and improves the practicality of the structure.

[0023] Please see Figure 5 As shown, the sound-absorbing cotton 9 is made of glass fiber material, and its surface is wrapped with a fabric layer to prevent the ultra-fine fibers in the sound-absorbing material from escaping and sticking to the skin.

[0024] The fabric layer is made of fiberglass cloth, which combines breathability and barrier properties. It can ensure that sound waves can enter the sound-absorbing cotton 9 smoothly, while effectively preventing the ultra-fine fiberglass from escaping, thus meeting the dual requirements of protection and acoustic performance.

[0025] Please see Figures 4-5As shown, the constraint layer 6 includes a damping layer 61. A set of metal plates 62 and 63 are respectively provided on both sides of the damping layer 61. The metal plates 62 and 63 constrain the damping layer 61, causing the damping layer 61 to undergo shear deformation under the action of sound waves. The sound energy is consumed through internal friction of the material, thereby enhancing the structure's absorption of residual sound waves.

[0026] Please see Figures 4-5 As shown, the damping layer 61 is made of butyl rubber, and adhesive is sprayed on both sides of the damping layer 61.

[0027] Please see Figures 4-5 As shown, metal plate 62 and metal plate 63 are connected to damping layer 61 by a pressure plate bonding. Metal plate 62 and metal plate 63 are aluminum plates. The pressure plate bonding can enhance the connection stability between metal plate 62 and metal plate 63 and damping layer 61.

[0028] Please see Figures 4-5 As shown, the elastic back plate 4 is bonded to the metal plate 63 through the adhesive layer 5. The adhesive layer 5 achieves a stable connection between the elastic back plate 4 and the metal plate 63, so that the vibration energy of the elastic back plate 4 can be effectively transferred to the constraint combination layer 6.

[0029] In practical use, the working principle of this utility model is as follows: During installation, bolts are used to connect and fix the structure to the keel.

[0030] During sound absorption and noise reduction, sound first enters the structure through the through-holes 11 on the micro-perforated plate 1. Air vibrates and rubs within the through-holes 11, initially weakening mid-to-high frequency noise. Subsequently, the sound enters the cavity 7, where it resonates and further dissipates sound energy. The sound-absorbing cotton 9 inside the cavity 7 has a porous structure, effectively absorbing low-frequency sound waves. Sound waves collide and rub within the pores of the sound-absorbing cotton 9, converting into heat energy that dissipates. The fiberglass cloth covering the surface of the sound-absorbing cotton 9 prevents the ultrafine fibers from escaping and also... To ensure the smooth penetration of sound waves without affecting the sound absorption effect, the remaining sound waves act on the elastic back plate 4, causing the elastic back plate 4 to vibrate. The viscoelastic material between the elastic back plate 4 and the rigid frame 2 can dampen the vibration, further reducing noise. Finally, the unabsorbed sound waves are transmitted to the constraint combination layer 6. The butyl rubber damping layer 61 undergoes shear deformation under the constraint of the two metal plates 62 and 63 on both sides, and converts the residual sound energy into heat energy through interface friction, thereby achieving efficient reduction of broadband noise.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A modular sound-absorbing structure, characterized in that, include: A micro-perforated plate (1) is provided with a set of rigid frames (2) installed on the upper and lower sides of the back of the micro-perforated plate (1). An elastic back plate (4) is provided behind the rigid frame (2), and the elastic back plate (4) and the rigid frame (2) are bonded together by a viscoelastic material layer (3). A cavity (7) is formed between the elastic back plate (4) and the micro-perforated plate (1). Sound-absorbing cotton (9) is placed in the cavity (7). A constraint combination layer (6) is provided behind the elastic back plate (4).

2. The modular sound-absorbing structure as described in claim 1, characterized in that: The surface of the micro-perforated plate (1) has multiple sets of through holes (11) of 0.3mm-0.4mm. The micro-perforated plate (1) is made of aluminum plate and is powder coated on both sides.

3. The modular sound-absorbing structure as described in claim 2, characterized in that: The rigid frame (2) has an opening (8) on top, and the sound-absorbing cotton (9) is filled into the cavity (7) through the opening (8).

4. The modular sound-absorbing structure as described in claim 3, characterized in that: The sound-absorbing cotton (9) is made of glass fiber material, and its surface is wrapped with a fabric layer.

5. A modular sound-absorbing structure as described in claim 4, characterized in that: The fabric layer is made of glass fiber cloth.

6. The modular sound-absorbing structure as described in claim 1, characterized in that: The constraint combination layer (6) includes a damping layer (61), and a set of metal plate one (62) and metal plate two (63) are respectively provided on both sides of the damping layer (61).

7. A modular sound-absorbing structure as described in claim 6, characterized in that: The damping layer (61) is made of butyl rubber, and adhesive is sprayed on both sides of the damping layer (61).

8. A modular sound-absorbing structure as described in claim 7, characterized in that: The metal plate one (62) and the metal plate two (63) are connected to the damping layer (61) by a pressure plate bonding, and the metal plate one (62) and the metal plate two (63) are aluminum plates.

9. A modular sound-absorbing structure as described in claim 8, characterized in that: The elastic back plate (4) is bonded to the metal plate (63) through the adhesive layer (5).

Images