Novel inserting plate type metal sound barrier unit plate

Abstract

The utility model belongs to the technical field of metal sound barriers, and particularly relates to a novel inserting plate type metal sound barrier unit plate. The metal sound barrier unit plate comprises a cavity formed by a face plate, a back plate and edge beams, a sound absorber is installed in the cavity, the sound absorber is composed of a honeycomb structure block and a viscoelastic fluid filling layer arranged in the honeycomb structure block or the sound absorber is composed of a rock wool core layer and a sound transmission plate clamping the rock wool core layer, irregular cavity gaps are distributed in the sound transmission plate, and the irregular cavity gaps are distributed in the cavity. In the cavity, a front reverberation chamber is formed between the sound absorber and the panel, and a rear reverberation chamber is formed between the sound absorber and the back plate; the metal sound barrier unit plate is provided with a composite sound absorption system and has the advantages of being long-acting and stable in sound absorption and noise reduction, firm in structure, economical and durable.

Description

Technical Field

[0001] This utility model belongs to the field of metal sound barrier technology, specifically relating to a novel insert-type metal sound barrier unit board. Background Technology

[0002] As an effective noise reduction facility, sound barriers can significantly reduce the additional attenuation of sound wave propagation, thereby reducing the noise impact in a certain area where the receiver is located. They are widely used in noise control projects for high-speed railways, highways, rail transit, municipal roads and industrial and mining enterprises. Metal sound barriers have been tested and developed in practice.

[0003] Currently, most metal sound barriers are thin-shell structures composed of panels and back panels, which are fixed with blind rivets to form unit panels. Most of the sound-absorbing components inside are rock wool. When rock wool is subjected to pulsating impacts such as noise and air pressure, the structure is prone to loosening and collapse, and gradually loses its noise reduction function. Secondly, the sound absorber adopts a single structure, which cannot achieve the absorption of multi-frequency noise, resulting in poor noise reduction effect. Utility Model Content

[0004] The purpose of this utility model is to provide a novel insert-type metal sound barrier unit panel with a composite sound absorption system, which has the characteristics of long-term stable sound absorption and noise reduction, and a robust, economical and durable structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel insert-type metal sound barrier unit panel includes a cavity composed of a front panel, a back panel, and side beams. A sound absorber is installed within the cavity. The sound absorber is characterized by being composed of a honeycomb structure block and a viscoelastic fluid filling layer placed inside it, or by a rock wool core layer and a sound-permeable plate sandwiching the rock wool core layer. Irregular cavities are distributed within the sound-permeable plate. Within the cavity, a front reverberation chamber is formed between the sound absorber and the front panel, and a rear reverberation chamber is formed between the sound absorber and the back panel.

[0007] The additional technical features constituting the above-mentioned novel insert-type metal sound barrier unit panel also include:

[0008] —The honeycomb structure block is an aluminum honeycomb panel or a polypropylene honeycomb panel, and the honeycomb pore size gradually increases from front to back in its thickness direction;

[0009] —The viscoelastic fluid filling layer is a silicone-based damping adhesive or a polyurethane gel;

[0010] —The side beam includes several vertical beams, each vertical beam including an H-section profile located in the middle of the unit panel and U-section profiles located on the left and right sides of the unit panel. The sound absorber is placed in the grooves of the H-section profile and the U-section profile respectively. Several elastic support plates are provided on both the H-section profile and the U-section profile in the front and back directions of the unit panel. The elastic support plates are in contact with the front panel or the back panel respectively.

[0011] —The back panel is a one-piece bent shape, with a first V-shaped groove bent on its upper and lower end faces. The upper and lower edges of the panel have folded edges. The second V-shaped groove provided at the end of the folded edge is engaged and positioned with the first V-shaped groove on the end face of the back panel.

[0012] —A flexible damping structure layer is provided at the contact area where the first V-groove and the second V-groove interlock;

[0013] —The flexible damping structure layer is a silicone adhesive layer.

[0014] Compared with existing technologies, the novel insert-type metal sound barrier unit panel provided by this utility model has the following advantages: The sound absorber inside the unit panel is composed of a honeycomb structure block and a viscoelastic fluid filling layer placed inside it, or the sound absorber is composed of a rock wool core layer and a sound-permeable plate sandwiching the rock wool core layer. Irregular cavities are distributed within the sound-permeable plate, and these cavities communicate with the surface of the sound-permeable plate. Compared with traditional sound-absorbing rock wool, the composite structure improves the strength-to-weight ratio of the sound absorber, the viscoelastic fluid filling layer effectively dampens the plate surface vibration, and the honeycomb core material effectively reduces… Transmitted noise is significantly reduced, thus improving the overall noise reduction coefficient. Secondly, within the cavity, a front reverberation chamber is formed between the sound absorber and the panel, and a rear reverberation chamber is formed between the sound absorber and the back panel. The depths of the front and rear reverberation chambers are made as different as possible, that is, cavities of unequal depth are formed between the back panel and the panel (before and after the sound absorber). The standing wave resonance principle is used to enhance the low-frequency sound absorption effect, giving the metal sound barrier unit panel a more long-lasting and stable sound absorption and noise reduction performance. It can effectively absorb and isolate noise in various frequency bands, and has the advantages of high structural strength, economy and durability. Attached Figure Description

[0015] Figure 1 This is a side view of a novel insert-type metal sound barrier unit panel according to the present invention.

[0016] Figure 2 This is a top view of the device;

[0017] Figure 3 This is a breakdown diagram of the front and back panels of the new insert-type metal sound barrier unit. Detailed Implementation

[0018] The structure and working principle of the novel insert-type metal sound barrier unit panel provided by this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In the description of this utility model, unless otherwise stated, the terms "upper / lower", "front / back", "left / right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0020] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figure 1 As shown, the structure of the novel insert-type metal sound barrier unit includes a cavity consisting of a panel 1, a back panel 2, and side beams. A sound absorber 3 is installed inside the cavity. The sound absorber 3 is composed of a honeycomb structure block 31 and a viscoelastic fluid filling layer 32 placed inside it. Inside the cavity, a front reverberation chamber 41 is formed between the sound absorber 3 and the panel 1, and a rear reverberation chamber 42 is formed between the sound absorber 3 and the back panel 2.

[0022] As an equivalent alternative, the aforementioned sound absorber can also be composed of a rock wool core layer and a sound-permeable plate sandwiching the rock wool core layer, with irregular cavities distributed within the sound-permeable plate, and the cavities communicating with the surface of the sound-permeable plate.

[0023] Its working principle is as follows: The front panel 1, back panel 2, and side beams of the unit board form a cavity. The sound absorber 3 installed inside the cavity is a composite structure, consisting of a honeycomb structure block 31 and a viscoelastic fluid filling layer 32 placed inside it. The honeycomb structure, based on the diffuse reflection and energy dissipation mechanism of sound waves, has excellent vibration reduction and noise reduction performance. The viscoelastic fluid filling layer 32 inside has a good damping effect, further converting vibration energy into heat energy, suppressing resonance effects, and dissipating energy through fluid shear deformation. Combined with the honeycomb core material (pore size 5-10mm), it enhances the uniformity of fluid distribution and improves impact resistance. Inside the cavity, reverberation chambers (41, 42) are set in front of and behind the sound absorber 3, preferably at different depths, forming a cavity fluid resonance sound absorber 3 system. Through the coupling effect of viscoelastic fluid and sound waves, the sound absorption frequency band is broadened. The thickness of the viscoelastic fluid filling layer 32 is 50-100mm, and its density matches the air acoustic impedance to achieve mid-to-low frequency noise attenuation.

[0024] It should be noted that this viscoelastic fluid generates minute displacements (±2mm) to release thermal stress and vibrational energy, dissipating energy through the combined effects of elastic deformation and fluid shear. Compared to traditional rock wool, the honeycomb structure block 31 improves compressive strength, reduces secondary structural noise and resonance peaks, extends the fatigue life of the metal sound barrier by 2-3 times, and broadens the noise reduction frequency band to 100-5000Hz, making it particularly suitable for scenarios with stringent requirements for strength and acoustic performance, such as high-speed rail and viaducts.

[0025] In the structure constituting the aforementioned novel insert-type metal sound barrier unit panel

[0026] — Preferably, the honeycomb structure block 31 is an aluminum honeycomb panel or a polypropylene honeycomb panel, which has the advantages of high strength and corrosion resistance. In its thickness direction, the honeycomb pore size gradually increases from front to back, for example, 5mm at the front end and 10mm at the rear end, in order to match the sound wave absorption requirements of different frequencies, the sound absorption frequency band is broadened to 200-5000Hz, and the low frequency (250Hz) sound absorption coefficient is increased by 30%;

[0027] — Considering high damping performance, environmental adaptability, ease of processing, and long-term stability, the viscoelastic fluid filling layer 32 is a silicone-based damping adhesive, which has the advantages of aging resistance and UV resistance, making it suitable for long-term outdoor use. It also has strong adhesion to metals and does not require additional adhesives when combined with honeycomb aluminum panels. Alternatively, polyurethane gel can be selected, which has excellent impact resistance, is suitable for dynamic load scenarios, and is easy to spray or grout.

[0028] --like Figure 2As shown, preferably, the above-mentioned side beam includes several vertical beams. The vertical beams include an H-section profile 51 located in the middle of the unit board and a U-shaped profile 52 located on the left and right sides of the unit board. The sound absorber 3 is placed in the grooves of the H-section profile 51 and the U-shaped profile 52 on both sides, respectively. That is, the H-section profile 51 in the middle of the unit board forms a keel to improve the structural strength of the board surface. The sound absorber 3 in the unit board is split and is locked on the left and right sides by the grooves of the vertical beams, so that the positioning is firm and stable.

[0029] Furthermore, the H-section profile 51 and the U-section profile 52 are provided with several elastic support plates (53, 53') in the front and rear directions of the unit plate. The elastic support plates (53, 53') contact the front panel 1 or the back panel 2 respectively, providing support space for the front and rear reverberation chambers (41, 42).

[0030] --like Figure 3 As shown, preferably, the back panel 2 is an integrally bent type, with a first V-shaped groove 61 bent on its upper and lower end faces, and a folded edge on the upper and lower edges of the panel 1. The second V-shaped groove 62 provided at the end of the folded edge is engaged and positioned with the first V-shaped groove 61 on the end face of the back panel 2. The integrally bent and interlocked panel 1 and back panel 2 are simple to process, easy to assemble, easy to disassemble and maintain, and save on usage costs.

[0031] —Furthermore, a flexible damping structure layer is provided at the contact area where the first V-groove 61 and the second V-groove 62 interlock. This flexible damping structure layer is a silicone adhesive layer 7. The silicone adhesive has good weather resistance, good sealing performance, prevents rainwater from seeping in, and has strong adhesion, high tensile strength, and vibration resistance, ensuring that the connection between the panel 1 and the back panel 2 is firm and stable.

[0032] The above-described embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the implementation of this utility model. Therefore, any other modifications or equivalent substitutions to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A novel insert-type metal sound barrier unit panel, comprising a cavity formed by a front panel, a back panel, and side beams, wherein a sound absorber is installed within the cavity, characterized in that: The sound absorber is composed of a honeycomb structure block and a viscoelastic fluid filling layer placed inside it, or the sound absorber is composed of a rock wool core layer and a sound-permeable plate sandwiching the rock wool core layer. Irregular cavities are distributed in the sound-permeable plate. In the cavity, a front reverberation chamber is formed between the sound absorber and the panel, and a rear reverberation chamber is formed between the sound absorber and the back panel.

2. The novel insert-type metal sound barrier unit panel according to claim 1, characterized in that: The honeycomb structure block is an aluminum honeycomb panel or a polypropylene honeycomb panel, and the honeycomb pore size gradually increases from front to back in its thickness direction.

3. A novel insert-type metal sound barrier unit panel according to claim 1 or 2, characterized in that: The viscoelastic fluid filling layer is a silicone-based damping adhesive or a polyurethane gel.

4. A novel insert-type metal sound barrier unit panel according to claim 1, characterized in that: The side beam includes several vertical beams, each vertical beam including an H-section profile located in the middle of the unit panel and a U-section profile located on the left and right sides of the unit panel. The sound absorber is placed in the grooves of the H-section profile and the U-section profile on both sides. Several elastic support plates are provided on the H-section profile and the U-section profile in the front and back directions of the unit panel. The elastic support plates are in contact with the front panel or the back panel respectively.

5. A novel insert-type metal sound barrier unit panel according to claim 1, characterized in that: The back panel is a one-piece bent shape, with a first V-shaped groove on its upper and lower end faces. The upper and lower edges of the panel have folded edges, and a second V-shaped groove at the end of the folded edge is engaged and positioned with the first V-shaped groove on the end face of the back panel.

6. A novel insert-type metal sound barrier unit panel according to claim 5, characterized in that: A flexible damping structure layer is provided at the contact area where the first V-groove and the second V-groove interlock.

7. A novel insert-type metal sound barrier unit panel according to claim 6, characterized in that: The flexible damping structure layer is a silicone adhesive layer.

Images