Comprehensive super-structure sound absorption silencing sheet

Abstract

The invention relates to the technical field of silencing sheets, in particular to a comprehensive type super-structure sound absorption silencing sheet which comprises a suction skin and an outer cover and further comprises a low-frequency sound absorption structure arranged in the suction skin, and the low-frequency sound absorption structure comprises a first micro-perforated plate, a second micro-perforated plate, a third micro-perforated plate, a first support and a partition plate. The number of the first supports is multiple, the two sides of each first support are fixed to the inner wall of the suction skin, the partition plates are fixed between the adjacent first supports, the third micro-perforated plate and the second micro-perforated plate are fixed to the inner sides of the front partition plate and the rear partition plate respectively, and the first micro-perforated plate is fixed to the inner side of the suction skin. A first sound absorption module is filled between the micro-perforated plate II and the micro-perforated plate III; the sound absorption material has good sound absorption performance for low frequency, intermediate frequency and high frequency, and can be applied to a complex sound environment, so that good full-frequency noise reduction can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sound-absorbing sheets, in particular to a comprehensive super-structured sound-absorbing sheet. Background Art

[0002] Acoustic metastructures are structures made of acoustic metamaterials that can achieve more complex and multifunctional acoustic properties. Acoustic metamaterials are materials with special acoustic properties that can achieve various effective acoustic functions within the acoustic band, such as sound wave absorption, scattering, isolation, resonance damping, and refractive index regulation. Sound-absorbing materials are materials that can absorb sound wave energy and convert it into heat or other forms of energy. It is mainly used to reduce the propagation and reflection of noise and improve the acoustic performance of a room or space.

[0003] Superstructure sound-absorbing and muffler sheets combine the advantages of acoustic superstructures and sound-absorbing materials. By designing a specific superstructure unit and sound-absorbing material combination, they can achieve efficient absorption and dissipation of sound waves. They usually have the characteristics of lightweight, wide-band sound absorption, and high sound absorption coefficient, and can effectively reduce noise levels and improve the acoustic environment.

[0004] Existing sound-absorbing and muffler sheets either have better sound absorption performance for mid-high frequencies or for low frequencies. The sound absorption performance of muffler sheets cannot guarantee that the sound absorption coefficient for frequencies above 50H is above 0.85. In order to achieve a sound absorption coefficient of 0.85 for frequencies above 50H, we designed a comprehensive super-structured sound-absorbing and muffler sheet. Summary of the invention

[0005] The purpose of the present invention is to provide a comprehensive super-structured sound-absorbing and muffler sheet, which can have good sound absorption performance for low frequency, medium frequency and high frequency, and can also be used in complex sound environments, thereby achieving good full-frequency noise reduction.

[0006] To achieve the above object, the present invention provides the following technical solution: a comprehensive super-structured sound-absorbing and muffler sheet, comprising a suction skin and an outer cover, and also comprising:

[0007] A low-frequency sound absorption structure is arranged inside the suction skin, the low-frequency sound absorption structure includes a micro-perforated plate 1, a micro-perforated plate 2, a micro-perforated plate 3, a first bracket and a partition, the number of the first bracket is several, and the two sides of the first bracket are fixed to the inner wall of the suction skin, the partition is fixed between adjacent first brackets, the micro-perforated plate 3 and the micro-perforated plate 2 are respectively fixed to the inner sides of the front and rear adjacent partitions, the micro-perforated plate 1 is fixed to the inner side of the suction skin, and the first sound absorption module is filled between the micro-perforated plate 2 and the micro-perforated plate 3;

[0008] A high-frequency sound absorbing structure is arranged inside the suction skin, and the medium- and high-frequency sound absorbing structure includes a second bracket, a sound absorbing panel and a second sound absorbing module. There are several second brackets, and both ends of the second brackets are fixed to the inner side of the suction skin. The sound absorbing panel is fixed to the inner side of the suction skin, and the second sound absorbing module is arranged between adjacent second brackets.

[0009] Preferably, the spacing between adjacent first brackets is 300-400mm and 400-500mm respectively, and the 300-400mm arc segment is filled with a 400mm super-structure sound absorber, and the 400-500mm arc segment is filled with a 500m super-structure sound absorber.

[0010] Preferably, the meta-structure sound absorber is composed of micro-perforated plate one, micro-perforated plate two, micro-perforated plate three and glass wool.

[0011] Preferably, the micro-perforated plate 1, the micro-perforated plate 2 and the micro-perforated plate 3 are all connected in the form of flat plates, and the spacing between each layer of plates can be adjusted in proportion according to the height of the actual filled arc segment.

[0012] Preferably, the second and third micro-perforated plates are fixed to the first bracket by riveting, and sealant is filled between them.

[0013] Preferably, the first sound absorbing module and the second sound absorbing module are made of glass wool, and the interior of the glass wool is porous.

[0014] Preferably, a sound absorbing body is filled between the sound absorbing panel and the inner wall of the suction skin, and the sound absorbing body is composed of glass wool and glass fiber cloth.

[0015] Preferably, the thickness of the micro-perforated plate 1, the micro-perforated plate 2 and the micro-perforated plate 3 is 1.2 mm, and the hole diameter and hole spacing of each plate are different.

[0016] Preferably, the inner circumference of the suction skin is fixedly connected with a mounting plate, and the top of the outer cover is threadedly connected with a lifting ring fastening bolt.

[0017] Preferably, the size of the outer cover is matched with the size of the suction skin, and the outer surface of the outer cover is tightly fitted with the inner wall of the top of the suction skin.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention comprises a part of mid-high frequency sound absorbing structure and a part of low frequency sound absorbing structure through the suction skin, wherein the mid-high frequency sound absorbing structure adopts the type of internal filling with porous sound absorbing material, and the low frequency sound absorbing structure adopts a super structure, and the interior is a multi-layer micro-perforated plate with different aperture sizes and spatial spacing arranged at different intervals, so that it not only has good strength and height stability, but also has good aerodynamic performance and shock resistance, and at the same time can also have good sound absorption performance for low frequency, mid frequency and high frequency, and can also be used in complex sound environment, thereby achieving good full-frequency noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the expanded structure in the present invention;

[0022] Figure 3 It is a rear cross-sectional structural schematic diagram of the present invention;

[0023] Figure 4 It is a schematic diagram of the top view structure of the present invention;

[0024] Figure 5 It is a schematic diagram of a partial expanded structure in the present invention.

[0025] In the figure: 1. suction skin; 2. outer cover; 3. low-frequency sound absorption structure; 31. micro-perforated plate one; 32. micro-perforated plate two; 33. micro-perforated plate three; 34. first bracket; 35. partition; 4. medium and high frequency sound absorption structure; 41. second bracket; 42. sound absorption panel; 43. second sound absorption module; 5. first sound absorption module; 6. mounting plate; 7. lifting ring fastening bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-5A comprehensive super-structure sound-absorbing and muffler sheet comprises a suction skin 1 and an outer cover 2. A low-frequency sound-absorbing structure 3 and a medium-high frequency sound-absorbing structure 4 are respectively arranged inside the suction skin 1. The low-frequency sound-absorbing structure 3 comprises a micro-perforated plate 1 31, a micro-perforated plate 2 32, a micro-perforated plate 3 33, a first bracket 34 and a partition 35. The thickness of the micro-perforated plate 1 31, the micro-perforated plate 2 32 and the micro-perforated plate 3 33 is 1.2 mm, and the aperture and hole spacing of each plate are different. In this way, it has the advantages of wide-band sound absorption, excellent medium-low frequency sound absorption performance, good structural stability and durability. There are several first brackets 34, and their two sides are fixed to the inner wall of the suction skin 1. The micro-perforated plate 2 32 and the micro-perforated plate 3 33 are fixed to the first bracket 34 by riveting, and there is sealant filled between them. The riveted fixation has high strength and durability, and can withstand large tension and pressure. The use of sealant between them can further improve the sealing performance of the overall structure and prevent the external environment from affecting the internal acoustic environment. The partition 35 is fixed between adjacent first brackets 34. The micro-perforated plate three 33 and the micro-perforated plate two 32 are respectively fixed on the inner sides of the front and rear adjacent partitions 35. The micro-perforated plate one 31 is fixed on the inner side of the suction skin 1. The first sound absorption module 5 is filled between the micro-perforated plate two 32 and the micro-perforated plate three 33. The medium and high frequency sound absorption structure 4 includes a second bracket 41, a sound absorption panel 42 and a second sound absorption module 43. There are several second brackets 41, and their two ends are fixed to the inner side of the suction skin 1. The sound absorption panel 42 is fixed on the inner side of the suction skin 1. The sound absorbing body is filled between the sound absorption panel 42 and the inner wall of the suction skin 1, and the sound absorption body is composed of glass wool and glass cloth. Glass wool is a porous sound absorbing material with fluffy and interlaced internal fibers and a large number of tiny pores. These pores can effectively absorb sound wave energy and reduce indoor noise. The glass fiber cloth as a covering layer can further enhance the sound absorption performance of the sound absorber. It can not only provide additional sound absorption area, but also further absorb and dissipate sound waves through its fiber structure. The second sound absorption module 43 is arranged between adjacent second brackets 41.

[0028] The spacing between adjacent first brackets 34 is 300-400mm and 400-500mm respectively, and the 300-400mm arc segment is filled with 400mm super-structured sound absorbers, and the 400-500mm arc segment is filled with 500m super-structured sound absorbers. In this way, by filling the corresponding sizes of super-structured sound absorbers in arc segments of different sizes, the space can be used more effectively and the distribution of the sound absorbers can be optimized. This customized filling method helps to achieve a more balanced sound absorption effect at different frequencies. The super-structured sound absorber itself has excellent low-frequency broadband sound absorption performance. Through reasonable arrangement, the sound absorption performance of the entire space can be further improved.

[0029] The super-structure sound absorber is composed of micro-perforated plate 1 31, micro-perforated plate 2 32, micro-perforated plate 3 33 and glass wool, so that a complex acoustic channel can be formed. When sound waves pass through these channels, multiple reflections and interferences will occur, thereby effectively absorbing the energy of the sound waves to obtain a higher sound absorption coefficient and a wider sound absorption frequency band, which is suitable for a variety of acoustic environments. Glass wool is a typical porous sound-absorbing material with fluffy and interlaced internal fibers and a large number of tiny pores, and has good sound absorption performance.

[0030] The micro-perforated plate 1 31, the micro-perforated plate 2 32 and the micro-perforated plate 3 33 are all connected in the form of flat plates, and the spacing between each layer of plates can be adjusted in proportion according to the height of the arc segment actually filled. After the micro-perforated plate is bent in an arc, it can better fit the shape of the arc guide vane, reduce the reflection and scattering of sound waves between the plate surface and the guide vane, and thus improve the sound absorption efficiency. By adjusting the spacing between each layer of plates, the propagation path of sound waves between the multi-layer micro-perforated plates can be further optimized, and the sound absorption effect can be enhanced.

[0031] The first sound absorbing module 5 and the second sound absorbing module 43 are made of glass wool, and the interior of the glass wool is porous, so that it has good sound absorption ability, can greatly reduce noise, and improve the comfort of the indoor environment.

[0032] The inner circumference of the suction skin 1 is fixedly connected with a mounting plate 6, and the top of the outer cover 2 is threadedly connected with a lifting ring fastening bolt 7, which is convenient for subsequent lifting work.

[0033] The size of the outer cover 2 is compatible with the size of the suction skin 1, and the outer surface of the outer cover 2 is tightly fitted with the inner wall of the top of the suction skin 1. In this way, after the outer cover 2 is covered on the top of the suction skin 1, the sealing effect between the suction skin 1 and the outer cover 2 can be improved.

[0034] Working principle: When in use, the medium and high frequency sound absorption structure 4 is filled with porous sound absorption materials. These pores can effectively absorb sound wave energy and reduce indoor noise. The glass cloth as a covering layer can further enhance the sound absorption performance of the sound absorber. It can not only provide additional sound absorption area, but also further absorb and dissipate sound waves through its fiber structure. The low frequency sound absorption structure 3 adopts a super structure, with multiple layers of micro-perforated plates with different aperture sizes and spatial spacing arranged at different intervals. After the micro-perforated plates are bent into arcs, they can better fit the shape of the arc guide vanes, reduce the reflection and scattering of sound waves between the plate surface and the guide vanes, and thus improve the sound absorption efficiency. By adjusting the spacing between the layers of plates, the propagation path of sound waves between the multiple layers of micro-perforated plates can be further optimized to enhance the sound absorption effect.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A comprehensive super-structured sound-absorbing and muffler sheet, comprising a suction skin (1) and an outer cover (2), characterized in that: Also includes: A low-frequency sound absorbing structure (3) is arranged inside the suction skin (1), the low-frequency sound absorbing structure (3) comprising a micro-perforated plate 1 (31), a micro-perforated plate 2 (32), a micro-perforated plate 3 (33), a first bracket (34) and a partition (35), the first bracket (34) being provided in a plurality of numbers, and both sides of the first bracket (34) are fixed to the inner wall of the suction skin (1), the partition (35) is fixed between adjacent first brackets (34), the micro-perforated plate 3 (33) and the micro-perforated plate 2 (32) are respectively fixed to the inner sides of the front and rear adjacent partitions (35), the micro-perforated plate 1 (31) is fixed to the inner side of the suction skin (1), and a first sound absorbing module (5) is filled between the micro-perforated plate 2 (32) and the micro-perforated plate 3 (33); A high-frequency sound absorbing structure (4) is arranged inside the suction skin (1), wherein the medium- and high-frequency sound absorbing structure (4) comprises a second bracket (41), a sound absorbing panel (42) and a second sound absorbing module (43), wherein the number of the second brackets (41) is multiple, and both ends of the second brackets (41) are fixed to the inner side of the suction skin (1), the sound absorbing panel (42) is fixed to the inner side of the suction skin (1), and the second sound absorbing module (43) is arranged between adjacent second brackets (41).

2. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The spacing between adjacent first brackets (34) is 300-400mm and 400-500mm respectively, and the 300-400mm arc segment is filled with a 400mm superstructure sound absorber, and the 400- The 500mm arc segment is filled with 500m super-structure sound absorber.

3. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 2 is characterized in that: The superstructure sound absorber is composed of a micro-perforated plate 1 (31), a micro-perforated plate 2 (32), a micro-perforated plate 3 (33) and glass wool.

4. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The micro-perforated plate 1 (31), micro-perforated plate 2 (32) and micro-perforated plate 3 (33) are all connected in the form of flat plates, and the spacing between each layer of plates can be adjusted in proportion according to the height of the actual filled arc segment.

5. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The second micro-perforated plate (32) and the third micro-perforated plate (33) are fixed to the first bracket (34) by riveting, and a sealant is filled between them.

6. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The first sound absorbing module (5) and the second sound absorbing module (43) are made of glass wool, and the interior of the glass wool is a porous structure.

7. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: A sound absorbing body is filled between the sound absorbing board (42) and the inner wall of the suction skin (1), and the sound absorbing body is composed of glass wool and glass fiber cloth.

8. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The thickness of the micro-perforated plate 1 (31), the micro-perforated plate 2 (32) and the micro-perforated plate 3 (33) is 1.2 mm, and the hole diameters and hole spacings of each plate are different.

9. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The inner circumference of the suction skin (1) is fixedly connected with a mounting plate (6), and the left and right sides of the top of the outer cover (2) are provided with lifting ring fastening bolts (7).

10. The comprehensive super-structured sound-absorbing and muffler sheet according to claim 1 is characterized in that: The size of the outer cover (2) is matched to the size of the suction skin (1), and the outer surface of the outer cover (2) is tightly fitted to the inner wall of the top of the suction skin (1).

Images