Sound insulation board with flexible film with non-uniform mass distribution

Abstract

The invention discloses a sound insulation board with a flexible film with non-uniform mass distribution, and belongs to the technical field of film sound insulation boards, the sound insulation board comprises a sound insulation frame, the sound insulation frame is internally provided with a plurality of separation beams perpendicular to one another, so that the sound insulation frame is divided into a plurality of sound insulation units in the horizontal and vertical directions, and the sound insulation units are arranged in the sound insulation frame. A thin film is arranged in each sound insulation unit; one side of the sound insulation frame is covered with the thin film, or the thin film is installed in the middle of the inner side of each sound insulation unit; the mass of the thin film is unevenly distributed, the mass of the thin film in the center of each sound insulation unit is larger than the mass of the edge of the thin film, the protruding thin film structure can form a local vibration mode, the flexibility and elasticity of the thin film are more suitable for low-frequency sound insulation, and after the mass block is removed, the weight of the whole sound insulation board is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of thin-film sound insulation panels, and more particularly to a sound insulation panel with a flexible membrane having a non-uniform mass distribution. Background Technology

[0002] Acoustic metamaterials possess negative mass density, enabling highly efficient sound insulation under lightweight conditions. Thin-film acoustic metamaterials are a common type of acoustic metamaterial. Traditional thin-film acoustic metamaterial unit cells can achieve near total reflection of sound waves at their anti-resonance frequency. A traditional thin-film acoustic metamaterial unit cell consists of a supporting frame, a thin film located on the supporting frame, and a mass block located at the center of the thin film.

[0003] Existing technologies, such as the thin-film type low-frequency sound insulation acoustic metamaterial with non-uniform mass and asymmetric distribution disclosed in Chinese Patent Publication No. CN113823254B, include at least one layer of acoustic metamaterial unit. The acoustic metamaterial unit includes a plurality of unit cells arranged in an M*N square array. Each unit cell includes a support frame, a thin film disposed within the support frame, and a mass block disposed on the thin film. Each mass block is disposed in a non-central region of the thin film, and the mass of each mass block is different. Here, M and N are positive integers greater than 1.

[0004] The aforementioned patent's solution requires attaching the mass blocks one by one evenly onto the film, making the production process quite complex. Summary of the Invention

[0005] The present invention proposes a sound insulation panel with a flexible membrane having a non-uniform mass distribution, which has a simple structure and can improve the sound insulation effect.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A sound insulation panel with a flexible membrane having a non-uniform mass distribution includes a sound insulation frame with several mutually perpendicular partition beams arranged within the frame, such that the frame is divided into several sound insulation units along both horizontal and vertical directions. Each sound insulation unit contains a membrane. The membrane is either covered on one side of the frame or mounted on the inner center of each unit. The membrane has a non-uniform mass distribution, with the mass at the center of each unit being greater than the mass at its edges.

[0008] A preferred embodiment of the present invention is that the thickness of the film is not uniform, and a protrusion is provided at the center of each sound insulation unit, the thickness of the protrusion being greater than the thickness of the film at the edge of the sound insulation unit.

[0009] A preferred embodiment of the present invention is that the film is covered on one side of the sound insulation frame, the film of all sound insulation units in the sound insulation frame is integrally formed, and the protrusion protrudes towards the interior of the sound insulation unit.

[0010] A preferred embodiment of the present invention is that multiple films are provided and are embedded in the inner middle of the sound insulation unit of each sound insulation frame, and the protrusion is provided in the middle of each film.

[0011] A preferred embodiment of the present invention is that the protrusions of the film protrude along one side of the sound insulation frame, or protrude simultaneously along both sides.

[0012] A preferred embodiment of the present invention is that the thickness of the protrusion is less than the thickness of the sound insulation frame.

[0013] A preferred embodiment of the present invention is that the protrusion of the film is connected to the edge of the film in an arc-shaped transition, or the thickness of the film other than the protrusion is uniformly set.

[0014] A preferred embodiment of the present invention is that the protrusions of the thin film are formed by stacking multiple thin films.

[0015] A preferred embodiment of the present invention is that the material of the film is one of polyimide, polyethylene, polyvinyl chloride, polypropylene, silicone rubber, PEI, PET, PET, PAR, PPS, and PEEK.

[0016] A preferred embodiment of the present invention is that the partition beam is provided with an installation groove for installing the film.

[0017] The beneficial effects of this invention are as follows:

[0018] (1) The protruding membrane structure can form local vibration modes. The flexibility and elasticity of the membrane are more suitable for low-frequency sound insulation. After the mass block is eliminated, the weight of the entire sound insulation panel is significantly reduced.

[0019] (2) The design of the protrusion and edge transition of the film can avoid the sound wave reflection or standing wave phenomenon inside the structure, so that the sound insulation material can perform more stably in a wider frequency range, thereby achieving a broadband sound insulation effect. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the sound insulation unit of Embodiment 1 and Embodiment 5 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution provided in the specific embodiments of the present invention.

[0022] Figure 2 These are the main structural views of Embodiments 1 and 5 of the sound insulation board with a flexible membrane having a non-uniform mass distribution provided in specific embodiments of the present invention.

[0023] Figure 3 This is a schematic diagram of the overall structure of the sound insulation unit arranged side by side in Embodiments 1 and 5 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention.

[0024] Figure 4 These are front views of Embodiments 1 and 5 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution, provided in specific embodiments of the present invention.

[0025] Figure 5 yes Figure 4 AA cross-section view;

[0026] Figure 6 This is a schematic diagram of the overall structure of the sound insulation unit arranged side by side in Embodiments 2 and 5 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention.

[0027] Figure 7 This is a front view of the sound insulation unit combining Embodiment 2 and Embodiment 5 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution, provided in a specific embodiment of the present invention.

[0028] Figure 8 yes Figure 7 Cross-sectional view of Example 3 of BB;

[0029] Figure 9 yes Figure 7 Cross-sectional view of Example 2 of BB;

[0030] Figure 10 This is a schematic diagram of the overall structure of the sound insulation unit arranged side by side in Embodiments 2 and 4 of the sound insulation panel with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention.

[0031] Figure 11 This is a front view of the overall structure of the sound insulation unit of Embodiment 2 or a combination of Embodiments 3 and 4, which is a sound insulation panel with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention.

[0032] Figure 12 yes Figure 11Cross-sectional view combining Embodiments 3 and 4 of CC;

[0033] Figure 13 yes Figure 11 Cross-sectional view combining Embodiment 2 and Embodiment 4 of CC;

[0034] Figure 14 yes Figure 11 Cross-sectional view of the combined embodiments 2, 4 and 6 of CC;

[0035] In the picture:

[0036] 1. Sound insulation frame; 101. Separation beam; 102. Sound insulation unit; 2. Membrane; 201. Protrusion. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1-14 As shown, the present invention provides a sound insulation panel with a flexible membrane having a non-uniform mass distribution, comprising a sound insulation frame 1, wherein a plurality of mutually perpendicular partition beams 101 are arranged within the sound insulation frame 1, thereby dividing the sound insulation frame 1 into a plurality of sound insulation units 102. A thin film 2 is arranged on one side or the inner side of the middle of the sound insulation unit 102. The mass of the thin film 2 is non-uniformly distributed, and the mass of the thin film at the center of each sound insulation unit is greater than the mass at the edge. Increasing the thickness of the thin film 2 will cause the overall sound transmission loss curve to shift towards the low frequency region. Furthermore, by increasing the protruding structure of the thin film 2, the sound insulation frequency band in the high frequency region will be widened, and the overall sound transmission loss curve will shift towards the high frequency region, thereby increasing the sound insulation effect.

[0040] A protrusion 201 is provided at the center of the film 2. The thickness of the protrusion 201 is greater than that of any other part of the film 2 except for the protrusion 201. Through several embodiments described below, it can be seen that the protrusion 201 of the film 2 can be formed in several ways. Increasing the thickness of the protrusion 201 can improve the rigidity of this part, thereby affecting its vibration characteristics. Higher rigidity reduces the response of this area to low-frequency vibrations, and can more effectively block the propagation of low-frequency noise. Increasing the thickness of the film 2 increases the frequency corresponding to the peak and trough values, increases the amplitude of the peak sound insulation, and increases the effective sound insulation range.

[0041] Working principle

[0042] When sound waves reach the sound insulation board provided by the present invention, part of the sound waves will be reflected back by the thin film 2, while the other part of the sound waves will be absorbed or continue to penetrate the sound insulation board, but their intensity will be attenuated to a certain extent. Through the vibration action of the protrusion 201 on the thin film 2 and the thin film 2 and the sound insulation frame 1, the propagation and interference effect of the sound waves can be minimized, thereby achieving the purpose of sound insulation.

[0043] The sound insulation frame 1 is made of rigid or flexible materials. Flexible frames have better vibration damping performance and can reduce the possibility of external vibrations being transmitted to the internal structure. This is very important for preventing external noise from entering through the frame. The film 2 is made of one of the following materials: polyimide, polyethylene, polyvinyl chloride, polypropylene, silicone rubber, PEI, PET, PAR, PPS, and PEEK.

[0044] Example 1

[0045] like Figure 1-5 As shown, the thin film 2 is integrally formed and covers one side of the sound insulation frame 1, and the protrusion 201 protrudes inward toward the inside of the sound insulation frame 1, as shown. Figure 5 The width h1 of the sound insulation frame 1 and the width h2 of the thickest part of the protrusion 201 of the film 2 are shown. h2 is less than h1, so that the protrusion 201 will not protrude from the sound insulation frame 1. By setting the protrusion 201 to the inside of the sound insulation frame 1, the protrusion 201 can resist a certain impact while providing sound insulation, and increase the service life of the sound insulation board.

[0046] Example 2

[0047] like Figure 6-7As shown in Figures 9-10, 11, and 13-14, the difference between this embodiment and Embodiment 1 is that the membrane 2 is disposed in the middle of the inner side of the sound insulation unit 102, in the mounting groove of the partition beam 101. The membrane 2 is located in the middle of the inner side of the frame, and the protrusions 201 also protrude to both sides, forming a symmetrical sound insulation structure. This effectively reduces the leakage of sound waves through the frame edges or seams, thereby improving the overall sound insulation performance. When the protrusions 201 of the membrane 2 located in the middle vibrate in the opposite direction, the sound radiation of the overall structure decreases, the sound insulation performance is enhanced, the generation of local resonance frequencies is avoided, and the transmission of noise is further reduced.

[0048] Example 3

[0049] like Figure 7 , 11 As shown in -12, the difference between this embodiment and embodiment 2 is that the film 2 is installed in the middle position inside the frame. At the same time, the film 2, like in embodiment 1, only protrudes on one side to form a protrusion 201, and at this time the thickness of the protrusion 201 is less than 1 / 2 of the thickness of the sound insulation frame 1.

[0050] Example 4

[0051] like Figure 10-14 As shown, the thickness of the protrusion 201 and the film 2, except for the protrusion 201, is uniformly set, so that the film 2 has consistent acoustic properties on the entire surface, including the ability to absorb, reflect and block sound waves, thereby avoiding acoustic performance instability or failure caused by uneven thickness.

[0052] Example 5

[0053] like Figure 1-9 As shown, the protrusion 201 of the membrane 2 is connected to the edge of the membrane 2 in an arc transition. The transition acts as a bridge connecting the protrusion 201 and the sound insulation frame 1, which can effectively alleviate the stress concentration caused by direct connection at the joint, avoid cracks or breaks in the structure during use, improve the durability of the overall structure, and the smooth deformation transition makes the force transmission between the protrusion and the frame more uniform, thereby improving the structural stability of the entire membrane device when subjected to external forces or vibrations.

[0054] Example 6

[0055] like Figure 14 As shown, the protrusion 201 of the film 2 is formed by stacking multiple layers of film 2. In this embodiment, the protrusion 201 is formed by stacking multiple layers of film 2 in the center, which makes the molding more convenient. The protrusion 201 of the film 2 is formed by stacking, and the increase in the surface density of the protrusion 201 increases the amplitude of the peak sound insulation and increases the effective sound insulation range.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A soundproofing panel with a flexible film having a non-uniform mass distribution, characterized in that: it comprises a soundproofing frame (1) in which a plurality of mutually perpendicular partition beams (101) are arranged, so that the soundproofing frame (1) is partitioned into a plurality of soundproofing units (102) along the horizontal and vertical directions, and each of the soundproofing units (102) is provided with a film (2); the film (2) is arranged on one side of the soundproofing frame (1), or the film (2) is arranged on the inner middle part of each of the soundproofing units (102); the mass of the film (2) is non-uniformly distributed, and the mass of the film (2) at the center of each of the soundproofing units (102) is greater than that at the edge.

2. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 1, characterized in that: the thickness of the film (2) is non-uniform, and the film (2) is provided with a protruding part (201) at the center of each of the soundproofing units (102), and the thickness of the protruding part (201) is greater than that of the film (2) at the edge of the soundproofing unit (102).

3. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 2, characterized in that: the film (2) is arranged on one side of the soundproofing frame (1), and the film (2) of all the soundproofing units (102) in the soundproofing frame (1) is integrally formed, and the protruding part (201) protrudes towards the inside of the soundproofing unit (102).

4. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 2, characterized in that: a plurality of films (2) are arranged, and each of the films (2) is arranged on the inner middle part of the soundproofing unit (102) of each of the soundproofing frames (1), and the middle part of each of the films (2) is provided with the protruding part (201).

5. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 4, characterized in that: the protruding part (201) of the film (2) protrudes along one side of the soundproofing frame (1), or protrudes along both sides simultaneously.

6. The soundproofing panel with a flexible film having a non-uniform mass distribution according to any one of claims 2-5, characterized in that: the thickness of the protruding part (201) is less than the thickness of the soundproofing frame (1).

7. The soundproofing panel with a flexible film having a non-uniform mass distribution according to any one of claims 2-5, characterized in that: the protruding part (201) of the film (2) is connected and transitioned to the edge of the film (2) in an arc shape, or the thickness of the film (2) except the protruding part (201) is uniformly arranged.

8. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 2, characterized in that: the protruding part (201) of the film (2) is formed by stacking a plurality of films.

9. The soundproofing panel with a flexible film having a non-uniform mass distribution according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The material of the film (2) is one of polyimide, polyethylene, polyvinyl chloride, polypropylene, silicone rubber, PEI, PET, PET, PAR, PPS, PEEK.

10. The sound baffle with a flexible film having a non-uniform mass distribution according to claim 4, characterized in that: The partition beam (101) is provided with a mounting groove for mounting the film (2).

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