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

Abstract

The utility model 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] The present invention relates to the technical field of thin film sound insulation panels, in particular to a sound insulation panel with a flexible film having non-uniform mass distribution. Background Art

[0002] Acoustic metamaterials possess negative mass density, enabling highly effective sound insulation while maintaining a lightweight design. Thin-film acoustic metamaterials are a common type of acoustic metamaterial. A conventional thin-film acoustic metamaterial unit cell achieves near-total reflection of sound waves at its antiresonant frequency. These units consist of a supporting frame, a thin film affixed to the frame, and a mass located at the center of the film.

[0003] Prior art, such as Chinese Patent Publication No. CN113823254B, discloses a thin-film low-frequency sound-isolating acoustic metamaterial with non-uniform mass and asymmetric distribution, comprising at least one layer of acoustic metamaterial units. The acoustic metamaterial units include a plurality of unit cells arranged in an M*N square matrix. 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 each mass block has a different mass. Wherein, M and N are positive integers greater than 1.

[0004] The solution of the above patent requires that the mass blocks be evenly adhered to the film one by one, and the production process is relatively complicated. Summary of the Invention

[0005] The present invention provides a sound insulation board 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 object, the present invention adopts the following technical solutions:

[0007] A sound insulation panel with a flexible membrane having a non-uniform mass distribution comprises a sound insulation frame, wherein a plurality of mutually perpendicular partition beams are disposed within the sound insulation frame, so that the sound insulation frame is divided into a plurality of sound insulation units in the horizontal and vertical directions, and each sound insulation unit is provided with a thin film; the thin film is covered on one side of the sound insulation frame, or is installed on the inner middle portion of each sound insulation unit; the mass of the thin film is non-uniformly distributed, and the mass of the thin film at the center of each sound insulation unit is greater than that at the edge.

[0008] A preferred technical solution of the present invention is that the thickness of the film is uneven, and a protrusion is provided at the center of each sound insulation unit. The thickness of the protrusion is greater than the thickness of the film at the edge of the sound insulation unit.

[0009] The preferred technical solution of the present application is that the film is arranged 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 protruding part protrudes towards the inside of the sound insulation unit.

[0010] The preferred technical solution of the present application is that a plurality of films are arranged, and each film is embedded in the middle of the inside of the sound insulation unit of each sound insulation frame, and the middle of each film is provided with the protruding part.

[0011] The preferred technical solution of the present application is that the protruding part of the film protrudes along one side of the sound insulation frame, or protrudes along both sides at the same time.

[0012] The preferred technical solution of the present application is that the thickness of the protruding part is less than the thickness of the sound insulation frame.

[0013] The preferred technical solution of the present application is that the protruding part of the film is arc-shapedly connected and transitioned with the edge of the film, or the thickness of the film except the protruding part is uniformly arranged.

[0014] The preferred technical solution of the present application is that the protruding part of the film is formed by stacking a plurality of films.

[0015] The preferred technical solution of the present application is that the material of the film is one of polyimide, polyethylene, polyvinyl chloride, polypropylene, silicone rubber, PEI, PET, PAR, PPS, and PEEK.

[0016] The preferred technical solution of the present application is that the partition beam is provided with a mounting groove for mounting the film.

[0017] The present application has the following beneficial effects:

[0018] (1) The protruding film structure can form a local vibration mode, the flexibility and elasticity of the film are more suitable for low-frequency sound insulation, and after the mass is cancelled, the weight of the entire sound insulation plate is significantly reduced.

[0019] (2) The design of the transition of the protruding part and the edge of the film can avoid the reflection or standing wave phenomenon of the sound wave in the structure, so that the sound insulation material performs more stably in a wider frequency range, thereby realizing a wide-frequency sound insulation effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In these drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0021] Figure 1 Schematic diagram of the overall structure of the sound insulation unit of Example 1 and Example 5 of the sound insulation board with a flexible membrane with non-uniform mass distribution provided in a specific embodiment of the present invention;

[0022] Figure 2 1 is a front view of the overall structure of Example 1 and Example 5 of the sound insulation board with a flexible membrane with non-uniform mass distribution provided in a specific embodiment of the present invention;

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

[0024] Figure 4 1 is a front view of Example 1 and Example 5 of a sound insulation board with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention;

[0025] Figure 5 yes Figure 4 AA cross-section of

[0026] Figure 6 1 is a schematic diagram of the overall structure of the sound insulation units of Example 2 and Example 5 arranged side by side in a sound insulation board with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention;

[0027] Figure 7 2 is a front view of a sound insulation unit comprising a combination of Example 2 and Example 5 of a sound insulation board 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 Example 3 cross-sectional view of the middle BB;

[0029] Figure 9 yes Figure 7 Example 2 cross-sectional view of the middle BB;

[0030] Figure 10 1 is a schematic diagram of the overall structure of the sound insulation units of Example 2 and Example 4 arranged side by side in a sound insulation board 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 a sound insulation unit of Example 2 or a combination of Example 3 and Example 4 of a sound insulation board with a flexible membrane having a non-uniform mass distribution provided in a specific embodiment of the present invention;

[0032] Figure 12 yes Figure 11A cross-sectional view of the combination of Example 3 and Example 4 of CC;

[0033] Figure 13 yes Figure 11 A cross-sectional view of the combination of Example 2 and Example 4 of CC;

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

[0035] In the picture:

[0036] 1. Sound insulation frame; 101. Partition beam; 102. Sound insulation unit; 2. Film; 201. Raised portion. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other in any way.

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

[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. A plurality of mutually perpendicular partition beams 101 are disposed within the sound insulation frame 1, so that the sound insulation frame 1 is divided into a plurality of sound insulation units 102. A thin film 2 is disposed on one side or inside the middle of each sound insulation unit 102. The mass of the thin film 2 is unevenly distributed, with the mass of the film at the center of each sound insulation unit being greater than that at the edge. Increasing the thickness of the thin film 2 shifts the overall sound transmission loss curve toward the low-frequency region. Furthermore, by increasing the protruding structure of the thin film 2, the sound insulation band in the high-frequency region is broadened, and the overall sound transmission loss curve is shifted toward the high-frequency region, thereby enhancing the sound insulation effect.

[0040] A raised portion 201 is provided in the middle of the membrane 2. Raised portion 201 is thicker than any other portion of the membrane 2 except for raised portion 201. As will be seen from the following embodiments, raised portion 201 can be formed in a variety of ways. Increasing the thickness of raised portion 201 improves the rigidity of this portion, thereby affecting its vibration characteristics. Higher rigidity reduces the response of this area to low-frequency vibrations, effectively blocking the propagation of low-frequency noise. Increasing the thickness of the membrane 2 increases the frequencies corresponding to peak and valley values, increases the amplitude of peak sound insulation, and expands the effective sound insulation range.

[0041] How it works

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

[0043] Sound insulation frame 1 is made of either a rigid or flexible material. Flexible frames offer enhanced vibration damping, reducing the likelihood of external vibrations being transmitted to the internal structure. This is crucial for preventing external noise from entering through the frame. Film 2 is made of a material selected from the group consisting of polyimide, polyethylene, polyvinyl chloride, polypropylene, silicone rubber, PEI, PET, PAR, PPS, and PEEK.

[0044] Example 1

[0045] like Figure 1-5 As shown, the film 2 is integrally formed and covered on one side of the sound insulation frame 1, and the protrusion 201 is formed to protrude toward the inner side of the sound insulation frame 1, as shown in FIG. Figure 5 The width h1 of the middle sound insulation frame 1 and the width h2 of the thickest part of the raised portion 201 of the film 2 are shown as follows. h2 is smaller than h1, so that the raised portion 201 does not protrude from the sound insulation frame 1. By arranging the raised portion 201 toward the inside of the sound insulation frame 1, the raised portion 201 can withstand certain impacts while providing sound insulation, thereby increasing the service life of the sound insulation board.

[0046] Example 2

[0047] like Figure 6-7, 9-10, 11 and 13-14, the difference between this embodiment and example 1 is that the film 2 is arranged in the middle of the inner side of the sound insulation unit 102, in the mounting groove of the partition beam 101, the film 2 is located in the middle of the inner side of the frame, and the protruding parts 201 are also protruding to both sides respectively, forming a symmetrical sound insulation structure, effectively reducing the leakage of sound waves through the edges or joints of the frame, thereby improving the overall sound insulation performance, so that the protruding parts 201 of the film 2 located in the middle position, while vibrating in the opposite direction, the overall structure sound radiation is reduced, the sound insulation performance is enhanced, the local resonance frequency is avoided, and the noise conduction is further reduced.

[0048] Example 3

[0049] As shown in Figure 7 , 11 -12, the difference between this embodiment and example 2 is that the film 2 is installed on the middle of the inner side of the frame, and at the same time, the film 2 has only single-side protrusion to form the protruding part 201 as in example 1, and the thickness of the protruding part 201 is less than 1 / 2 of the thickness of the sound insulation frame 1.

[0050] Example 4

[0051] As shown in Figure 10-14 , the thickness of the protruding part 201 and the film 2 except the protruding part 201 is uniformly arranged, 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 unstable or ineffective acoustic performance caused by uneven thickness.

[0052] Example 5

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

[0054] Example 6

[0055] As shown in Figure 14 , the protruding part 201 of the film 2 is formed by stacking multiple layers of film 2, in this embodiment, the protruding part 201 is formed by stacking multiple layers of film 2 in the center, which is more convenient for molding, and the protruding part 201 of the film 2 is formed by stacking, which increases the peak sound insulation amount of the additional mass surface density, effectively increases the effective sound insulation range.

[0056] The above examples are only used to illustrate the technical solutions of the present application but not limit the present application, and the present application is described in detail only with reference to the preferred embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A sound insulation panel with a flexible membrane having a non-uniform mass distribution, characterized in that: The invention comprises a sound insulation frame (1), wherein a plurality of mutually perpendicular partition beams (101) are arranged in the sound insulation frame (1), so that the sound insulation frame (1) is divided into a plurality of sound insulation units (102) along the horizontal and vertical directions, and a film (2) is arranged in each of the sound insulation units (102); The film (2) is covered on one side of the sound insulation frame (1), or the film (2) is installed on the inner middle part of each sound insulation unit (102); The mass of the film (2) is unevenly distributed, and the mass of the film (2) at the center of each sound insulation unit (102) is greater than the mass at the edge.

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

3. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to claim 2, characterized in that: The film (2) is covered on one side of the sound insulation frame (1), the films (2) of all the sound insulation units (102) in the sound insulation frame (1) are integrally formed, and the raised portion (201) is raised toward a position close to the inside of the sound insulation unit (102).

4. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to claim 2, characterized in that: The film (2) is provided in plurality and is embedded in the middle portion of the inner side of the sound insulation unit (102) of each sound insulation frame (1), and the raised portion (201) is provided in the middle portion of each film (2).

5. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to claim 4, characterized in that: The raised portion (201) of the film (2) is raised along one side of the sound insulation frame (1), or is raised along both sides simultaneously.

6. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to any one of claims 2 to 5, characterized in that: The thickness of the raised portion (201) is smaller than the thickness of the sound insulation frame (1).

7. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to any one of claims 2 to 5, characterized in that: The raised portion (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) other than the raised portion (201) is uniformly set.

8. The sound insulation panel with a flexible membrane having a non-uniform mass distribution according to claim 2, characterized in that: The protruding portion (201) of the film (2) is formed by stacking multiple layers of films.

9. The sound insulation panel with a flexible membrane 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, PAR, PPS, and PEEK.

10. The sound insulation panel with a flexible membrane 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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