Noise reduction barrier

Abstract

The utility model relates to the technical field of noise reduction equipment, and discloses a noise reduction barrier which comprises a noise reduction barrier body arranged in sequence, and the noise reduction barrier body comprises a barrier frame, a base and a noise reduction structure located in the barrier frame. The noise reduction structure comprises noise reduction pipes, first sound absorption and insulation cotton, second sound absorption and insulation cotton and impedance gradient type reflecting plates, the noise reduction pipes are evenly arranged and distributed in the barrier frame, the first sound absorption and insulation cotton is distributed and located between the outer walls of the noise reduction pipes in the barrier frame, and a spiral airflow structure is arranged on the inner circumferential wall of each noise reduction pipe. The second sound absorption and insulation cotton is located on the inner circumferential wall of the noise reduction pipe outside the spiral airflow structure. According to the noise reduction barrier, high-frequency noise reduction is enhanced through the two-stage sound absorption system, the spiral airflow structure and the impedance gradual change type reflecting plate cooperatively improve the low and medium frequency noise elimination amount, oblique incidence sound wave absorption is optimized through the micro-perforation gradient design, triple mechanisms of material sound absorption, reflection interference and path dissipation are fused, and the noise reduction effect is good.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction equipment technology, specifically a noise reduction barrier. Background Technology

[0002] With the acceleration of urbanization and the densification of transportation networks, traffic noise has become a key challenge in urban environmental management. The distance between major transportation arteries such as highways and railways and sensitive areas such as residential areas, schools, and hospitals is constantly shrinking. Continuous traffic noise not only disrupts residents' normal lives but also poses potential threats to human health, such as hearing loss, sleep disorders, and an increased risk of cardiovascular disease. Statistics show that when environmental noise consistently exceeds 60 dB, residents' life satisfaction decreases significantly, and peak traffic noise levels can reach over 85 dB in some road sections, making traditional noise reduction methods insufficient to meet the management needs.

[0003] Currently, road noise barriers, as the mainstream technology for traffic noise control, still face several technical bottlenecks: First, their noise reduction capacity is insufficient. Traditional noise barriers mostly rely on single sound-absorbing or sound-insulating materials, which, while having a certain suppression effect on high-frequency noise, have low absorption efficiency for low-frequency noise with strong penetration and slow attenuation. Second, their noise reduction mechanisms are simplistic. Existing structures only treat noise through material sound absorption, and standardized noise barriers are insufficient to meet noise reduction requirements. Therefore, to address these shortcomings, we propose a noise reduction barrier. Utility Model Content

[0004] The purpose of this invention is to provide a noise reduction barrier to address the problems mentioned in the background art, where current sound barriers mostly rely on single sound-absorbing or sound-insulating materials, resulting in low absorption efficiency for low-frequency noise with strong penetration and slow attenuation. Standardized sound barriers cannot meet noise reduction requirements by only using materials to absorb noise.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A noise reduction barrier includes noise reduction barrier bodies arranged in sequence. The noise reduction barrier body includes a barrier frame, a base, and a noise reduction structure located inside the barrier frame. The barrier frame is rectangular and is mounted on the base. An installation splicing groove is provided on one outer wall of the barrier frame, and an installation block that matches and connects to the installation splicing groove is provided on the other outer wall of the barrier frame.

[0007] The noise reduction structure includes a noise reduction tube, a first sound-absorbing and sound-insulating cotton, a second sound-absorbing and sound-insulating cotton, and an impedance-gradient reflector. The noise reduction tubes are evenly arranged inside the barrier frame. The first sound-absorbing and sound-insulating cotton is distributed between the inside of the barrier frame and the outer wall of the noise reduction tube. A graphene aerogel layer is embedded in the first sound-absorbing and sound-insulating cotton. A spiral airflow structure is provided on the inner circumferential wall of each noise reduction tube. The second sound-absorbing and sound-insulating cotton is located on the inner circumferential wall of the noise reduction tube outside the spiral airflow structure.

[0008] Preferably, the impedance gradient reflector is located at the bottom inside the noise reduction tube. The impedance gradient reflector includes a fiberglass board and a steel plate. The fiberglass board is pasted on the steel plate. The fiberglass board has a gradient structure from low density to high density. Multiple steel plates are sequentially spliced ​​and combined to connect with the barrier frame.

[0009] Preferably, the surface of the impedance gradient reflector is provided with micro-perforated structural holes, the diameter of the micro-perforated structural holes is gradient-distributed near the wall of the noise reduction tube, and the diameter gradually increases towards the tube wall near the center of the noise reduction tube.

[0010] Preferably, both the first and second sound-absorbing and sound-insulating cotton are polyester fiber sound-absorbing cotton.

[0011] Preferably, the spiral airflow structure is a spiral protrusion with a spiral lead that is twice the diameter of the noise reduction tube.

[0012] Preferably, a solar panel is provided on the top of the noise reduction barrier body, the solar panel is connected to the barrier frame through a bracket, and the solar panel is connected to an energy storage battery for powering the monitoring and lighting equipment installed on the noise reduction barrier.

[0013] This utility model has the following beneficial effects:

[0014] 1. The first sound-absorbing and sound-insulating cotton of this application is embedded in a graphene aerogel layer, which, together with the porous polyester fiber structure of the second sound-absorbing and sound-insulating cotton, forms a "dual-stage sound absorption system" with good sound insulation and noise reduction effect.

[0015] 2. The spiral airflow structure guides the sound waves to form a spiral reflection path, extending the contact time with the sound-absorbing material. At the same time, the impedance-gradient reflector achieves a smooth transition of acoustic impedance through the density gradient of the glass fiber board, so that the mid-to-low frequency sound waves produce an interference effect in the reflection, thereby increasing the noise reduction.

[0016] 3. The gradient distribution of the micro-perforated structure aperture enables differentiated absorption of sound waves at different incident angles, improving the absorption efficiency of obliquely incident high-frequency noise.

[0017] 4. Breaking through the limitations of traditional "single material sound absorption", it integrates three mechanisms: material sound absorption (graphene aerogel + polyester fiber), sound wave reflection interference (impedance gradient plate), and path extension dissipation (spiral airflow structure) to form a synergistic noise reduction effect.

[0018] 5. The noise reduction barrier body achieves standardized splicing through installation splicing slots and installation blocks, which is highly efficient in installation and can be replaced independently if damaged, resulting in low maintenance costs. Attached Figure Description

[0019] Figure 1 This is an overall isometric view of the present invention.

[0020] Figure 2 This is a schematic diagram of the noise reduction barrier body structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the bottom structure of the noise reduction barrier body of this utility model.

[0022] Figure 4 For the present utility model Figure 2 Enlarged view of area A in the middle.

[0023] Figure 5 This is a schematic diagram of the impedance-gradient reflector structure of this utility model.

[0024] Figure 6 This is a schematic diagram showing the gradient distribution of the pore size in the micro-perforated structure of this utility model.

[0025] In the diagram: 1. Noise reduction barrier body; 11. Barrier frame; 12. Base; 13. Noise reduction structure; 131. Noise reduction tube; 132. First sound-absorbing and sound-insulating cotton; 133. Impedance gradient reflector; 134. Second sound-absorbing and sound-insulating cotton; 135. Spiral airflow structure; 136. Micro-perforated structure holes; 14. Mounting splicing groove; 15. Mounting block; 16. Fiberglass board; 17. Steel plate; 18. Solar panel. Detailed Implementation

[0026] 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.

[0027] Please see the appendix Figure 1-6As shown, a noise reduction barrier includes a noise reduction barrier body 1 arranged sequentially. The noise reduction barrier body 1 includes a barrier frame 11, a base 12, and a noise reduction structure 13 located inside the barrier frame 11. The barrier frame 11 is rectangular in shape and is formed by welding aluminum alloy rectangular profiles. The barrier frame 11 is installed on the base 12, which is a precast reinforced concrete structure. The base 12 has embedded parts and is fixed to the barrier frame 11 by M12 bolts. An installation splicing groove 14 is provided on one outer wall of the barrier frame 11, and a mounting joint groove 14 is provided on the other outer wall of the barrier frame 11. The splicing slot 14 is matched with the connected mounting block 15. A sealing rubber strip is embedded at the connection of the slot and the block. A solar panel 18 is set on the top of the noise reduction barrier body 1. The solar panel 18 is connected to the barrier frame 11 through a bracket. The solar panel 18 is connected to an energy storage battery to power the monitoring and lighting equipment set on the noise reduction barrier. No external power supply is required. It is suitable for remote road sections and has low operation and maintenance costs. The energy storage battery supports the sensor to upload noise data to the management platform in real time. When the noise exceeds the standard (e.g., ≥70dB), the LED light strip automatically switches to the warning mode and the LED light strip flashes. The response time is <10 seconds.

[0028] The noise reduction barrier body 1 of this application achieves standardized splicing through the installation splicing groove 14 and the installation block 15, which has high installation efficiency, and can be replaced independently when damaged, resulting in low maintenance cost.

[0029] Please see the appendix Figure 2 , 4As shown in Figures 5 and 6, the noise reduction structure 13 includes a noise reduction tube 131, a first sound-absorbing and sound-insulating cotton 132, a second sound-absorbing and sound-insulating cotton 134, and an impedance-gradient reflector 133. The noise reduction structure 13 achieves multi-mechanism synergistic noise reduction through the innovative combination of the noise reduction tube 131, the sound-absorbing and sound-insulating cotton, the impedance-gradient reflector 133, and the spiral airflow structure 135. This improves the noise reduction efficiency compared to traditional single-material sound barriers. The noise reduction tubes 131 are evenly distributed inside the barrier frame 11. The noise reduction tubes 131 are evenly arranged in a matrix within the barrier frame 11, forming the basic channel for sound wave propagation. The first sound-absorbing and sound-insulating cotton 132 is distributed between the outer walls of the noise reduction tubes 131 inside the barrier frame 11. The first sound-absorbing and sound-insulating cotton 132 has a graphene aerogel layer embedded inside it. The first sound-absorbing and sound-insulating cotton 132 fills the space between the outer wall of the noise reduction tubes 131 and the barrier frame 11, and has a graphene aerogel layer embedded inside it, forming a composite sound absorption system. The unique three-dimensional network structure of graphene aerogel makes it far more capable of adsorbing and dissipating high-frequency noise than ordinary materials. This structure alone can increase the high-frequency noise reduction by 10-15dB.The combination of polyester fiber cotton and graphene aerogel constructs a "gradient sound-absorbing barrier" from high to mid frequencies, effectively blocking sharp high-frequency components in traffic noise (such as car horns) and reducing interference with the surrounding environment. Each noise-reducing tube 131 has a spiral airflow structure 135 on its inner circumferential wall. The spiral airflow structure 135 is a spiral protrusion with a spiral lead twice the diameter of the noise-reducing tube 131. The spiral airflow structure 135 on the inner wall of the noise-reducing tube 131 is designed as a spiral protrusion, with the spiral lead precisely set to twice the tube diameter. This parameter extends the sound wave propagation path within the tube to 3-4 times the straight-line propagation path. When the sound wave travels along the spiral path, the contact time with the second sound-absorbing cotton 134 is significantly increased. Combined with the porous structure of the polyester fiber material... The absorption efficiency of mid-to-high frequency noise is improved. At the same time, the spiral structure guides the sound waves to refract and reflect, causing sound waves from different paths to interfere with each other, further dissipating sound energy and breaking through the noise reduction limitations of traditional straight cylinder structures. The second sound-absorbing and sound-insulating cotton 134 is located on the inner circumferential wall of the noise reduction tube 131 outside the spiral airflow structure 135. The first sound-absorbing and sound-insulating cotton 132 and the second sound-absorbing and sound-insulating cotton 134 are both polyester fiber sound-absorbing cotton. The impedance gradient reflector 133 is located at the bottom inside the noise reduction tube 131. The impedance gradient reflector 133 includes a glass fiber board 16 and a steel plate 17. The glass fiber board 16 is pasted on the steel plate 17. The glass fiber board 16 is set with a gradient structure from low density to high density of steel plate 17. The surface of the impedance gradient reflector 133 is provided with micro-perforations. The perforated structure 136, with its micro-perforated structure, exhibits a gradient distribution in diameter near the wall of the noise-reducing tube 131, gradually increasing in diameter towards the wall. Similarly, the micro-perforated structure 136 on the surface of the impedance-gradient reflector 133 also exhibits a gradient distribution in diameter, with a diameter of 0.5–1 mm near the center of the noise-reducing tube 131 and 1–2 mm near the wall. This design allows for differentiated absorption of sound waves at different incident angles. The impedance-gradient reflector 133 at the bottom of the noise-reducing tube 131 is composed of a low-density fiberglass board 16 gradually transitioning to a high-density steel plate 17. This design causes the acoustic impedance to change linearly along the direction of sound wave propagation. When the sound wave reaches the reflector, the gradual change in acoustic impedance results in multiple reflections and refractions, avoiding the effects of sudden changes in acoustic impedance. To address the issue of strong sound wave reflection and transmission, the micro-perforated structure 136 on the surface can specifically absorb sound waves at different incident angles. For obliquely incident sound waves (such as lateral noise from a moving vehicle), it effectively solves the problem of insufficient absorption of high-frequency sound waves by traditional reflectors. Multiple steel plates 17 are sequentially spliced ​​and connected to the barrier frame 11. The multiple steel plates 17 are connected to the barrier frame 11 using a mortise and tenon splicing process, with splicing gaps ≤1mm, ensuring structural stability while preventing sound leakage. The reflector, the spiral airflow structure, and the sound-absorbing and sound-insulating cotton form a complete noise reduction chain of "reflection-guidance-absorption". The spiral airflow structure first guides the sound waves to the sound-absorbing cotton for initial attenuation. The residual sound waves are reflected back into the tube by the reflector and interact with the sound-absorbing material again, ultimately achieving a broadband noise reduction effect.

[0030] When the noise barrier is in operation, when traffic noise propagates to the noise reduction barrier, the noise reduction structure 13 works synergistically through a triple mechanism of "sound wave guidance - gradient absorption - reflection interference" to achieve broadband and efficient noise reduction. After the noise enters the barrier frame 11, it first comes into contact with the first sound-absorbing and sound-insulating cotton 132 distributed between the outer walls of the noise reduction tube 131 and the graphene aerogel layer embedded inside it. With its unique three-dimensional network structure, it exhibits a strong adsorption and dissipation capacity for high-frequency noise. At the same time, the porous matrix composed of polyester fiber cotton further absorbs mid-to-high frequency sound waves, forming a "dual-effect filter" that effectively weakens sharp high-frequency noises such as car horns and tire friction, reducing instantaneous interference to the surrounding environment.

[0031] The sound waves, after initial attenuation, enter the noise-reducing tube 131. The spiral airflow structure 135 on the inner wall (with a spiral lead twice the tube diameter) forces the sound waves to propagate along a spiral path, extending the propagation distance to 3-4 times that of straight-line propagation. During this process, the contact time between the sound waves and the second sound-absorbing and sound-insulating cotton 134 is significantly increased. Combined with the frictional loss characteristics of the porous structure for mid-to-high frequency sound waves, and the refraction and reflection of sound waves caused by the spiral structure, the sound waves from different paths interfere with each other, converting some of the sound energy into heat energy, further breaking through the noise reduction limit of the traditional straight-tube structure.

[0032] The residual sound waves reach the impedance-gradient reflector 133 at the bottom of the noise reduction tube. This reflector is composed of a low-density fiberglass board 16 and a high-density steel plate 17 in a gradually changing composite, so that the acoustic impedance changes linearly along the direction of sound wave propagation. When the sound wave is incident, multiple reflections and refractions occur due to the gradual change in acoustic impedance, avoiding strong reflection and back transmission of the sound wave caused by abrupt changes in acoustic impedance, effectively processing low-frequency noise. The micro-perforated structure 136 on the surface of the reflector adopts a gradient aperture design (0.5-1mm at the center → 1-2mm at the tube wall), which achieves differentiated absorption for sound waves with different incident angles (such as vehicle side noise), improving the absorption efficiency of obliquely incident high-frequency sound waves by 35%, and the noise reduction in the 4000Hz frequency band can reach 22dB, making up for the high-frequency absorption shortcomings of traditional reflectors.

[0033] The steel plate 17 is securely connected to the barrier frame 11 through a mortise and tenon splicing process (gap ≤ 1mm) to ensure structural airtightness. During the entire noise reduction process, the spiral airflow structure first guides the sound waves to the sound-absorbing cotton for initial attenuation. The residual sound waves are reflected back into the tube by the reflector plate and interact with the sound-absorbing material again, forming a "reflection-guidance-absorption" cyclic noise reduction chain.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A noise barrier comprising noise barrier bodies (1) arranged one after another, characterized in that: The noise reduction barrier body (1) includes a barrier frame (11), a base (12) and a noise reduction structure (13) located inside the barrier frame (11). The barrier frame (11) is rectangular in shape and is mounted on the base (12). An installation splicing groove (14) is provided on one side of the outer wall of the barrier frame (11), and an installation block (15) that matches and connects to the installation splicing groove (14) is provided on the other side of the outer wall of the barrier frame (11). The noise reduction structure (13) includes a noise reduction tube (131), a first sound-absorbing and sound-insulating cotton (132), a second sound-absorbing and sound-insulating cotton (134), and an impedance-gradient reflector (133). The noise reduction tubes (131) are evenly distributed inside the barrier frame (11). The first sound-absorbing and sound-insulating cotton (132) is distributed between the inside of the barrier frame (11) and the outer wall of the noise reduction tube (131). The first sound-absorbing and sound-insulating cotton (132) has a graphene aerogel layer embedded in it. A spiral airflow structure (135) is provided on the inner circumferential wall of each noise reduction tube (131). The second sound-absorbing and sound-insulating cotton (134) is located on the inner circumferential wall of the noise reduction tube (131) outside the spiral airflow structure (135).

2. A noise barrier according to claim 1, wherein: The impedance gradient reflector (133) is located at the bottom inside the noise reduction tube (131). The impedance gradient reflector (133) includes a fiberglass board (16) and a steel plate (17). The fiberglass board (16) is pasted on the steel plate (17). The fiberglass board (16) is set with a gradient structure from low density to high density of the steel plate (17). Multiple steel plates (17) are sequentially spliced ​​and combined to connect with the barrier frame (11).

3. A noise barrier according to claim 1, wherein: The surface of the impedance gradient reflector (133) is provided with micro-perforated structure holes (136). The diameter of the micro-perforated structure holes (136) near the wall of the noise reduction tube (131) is distributed in a gradient, and the diameter of the holes near the center of the noise reduction tube (131) gradually increases towards the tube wall.

4. A noise barrier according to claim 1, wherein: Both the first sound-absorbing and sound-insulating cotton (132) and the second sound-absorbing and sound-insulating cotton (134) are polyester fiber sound-absorbing cotton.

5. A noise barrier according to claim 1, wherein: The spiral airflow structure (135) is a spiral protrusion, and its spiral lead is twice the diameter of the noise reduction tube (131).

6. A noise barrier according to claim 1, wherein: The top of the noise reduction barrier body (1) is provided with a solar panel (18), which is connected to the barrier frame (11) through a bracket. The solar panel (18) is connected to an energy storage battery for powering the monitoring lighting equipment installed on the noise reduction barrier.

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