A type of sound-absorbing and noise-reducing foam

Abstract

This utility model discloses a sound-absorbing and noise-reducing foam, relating to the field of foam technology. The utility model includes a cushioning sponge, with an upper foam fixedly connected to the bottom of the cushioning sponge, and a lower foam disposed at the bottom of the upper foam. This utility model forms a dynamic sound-absorbing structure through the synergistic effect of the horizontal and vertical sound-absorbing cotton and the micro-springs in the noise-reducing component. When sound waves enter the foam, the horizontal and vertical sound-absorbing cotton absorb high-frequency noise through their porous structure, while the micro-springs vibrate under the action of sound waves, converting sound energy into mechanical energy and further dissipating it, effectively enhancing the absorption of low-frequency noise. Simultaneously, the composite component adopts a three-layer composite structure of a sound-absorbing layer, a transition layer, and a damping layer. By matching the acoustic impedance of different materials, the transmission loss of sound waves between different media is optimized, thereby broadening the sound absorption band and making the overall sound absorption and noise reduction performance more balanced.

Description

Technical Field

[0001] This utility model belongs to the field of foam technology, and in particular relates to a sound-absorbing and noise-reducing foam. Background Technology

[0002] Foam is a soft and lightweight material composed of porous materials, usually made of foam plastics, rubber or other polymer materials. It is characterized by a large number of tiny pores, which can effectively absorb sound, vibration and impact in the air. Therefore, it is widely used in sound absorption and noise reduction, heat insulation, cushioning and protection. In addition, foam is also commonly used in packaging materials, automotive interiors, furniture, building sound insulation and other industries. It is widely used because of its advantages such as being lightweight, easy to process and low cost.

[0003] Most existing foams use static materials as their main structure to achieve sound absorption and noise reduction. However, the sound absorption effect of such static materials is limited when facing noise of different frequencies. The structure and performance of static materials are relatively fixed during use and are difficult to adjust effectively according to changes in environmental noise. Therefore, when encountering sounds of different frequencies, the sound absorption effect of static foam cannot reach its optimal state, especially for high-frequency noise. Since foam cannot flexibly cope with frequency changes and fluctuations in noise intensity, its overall sound absorption and noise reduction effect is also affected to some extent.

[0004] To address these issues, we provide a sound-absorbing and noise-reducing foam. Utility Model Content

[0005] The purpose of this invention is to provide a sound-absorbing and noise-reducing foam. By combining noise-reducing components and composite components, it solves the problem that existing foams, which are mainly static materials, have limited sound absorption and noise reduction effects for different frequencies.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a sound-absorbing and noise-reducing foam, comprising a cushioning sponge, an upper foam fixedly connected to the bottom of the cushioning sponge, and a lower foam disposed at the bottom of the upper foam. A noise-reducing component is disposed between the upper and lower foams, comprising a transverse sound-insulating cotton disposed in the inner cavity of the lower foam, a vertical sound-insulating cotton fixedly connected to the top of the transverse sound-insulating cotton, and a micro spring fixedly connected to one side of the transverse sound-insulating cotton. The noise-reducing component is used for sound absorption and noise reduction. A composite component is disposed in the inner cavity of both the transverse and vertical sound-insulating cottons. The composite component comprises a sound-absorbing layer fixedly connected to one side of the surface of the transverse and vertical sound-insulating cottons, a transition layer fixedly connected to one side of the sound-absorbing layer, and a damping layer fixedly connected to one side of the transition layer. The composite component is composed of three layers: the sound-absorbing layer, the transition layer, and the damping layer. The composite component is used to improve the sound absorption performance of the transverse and vertical sound-insulating cottons.

[0008] The present invention is further configured such that a first adhesive layer is bonded to the bottom of the lower foam, and the surface of the first adhesive layer is fixedly connected to the bottom of both the horizontal and vertical sound insulation cotton.

[0009] The present invention is further configured such that a second adhesive layer is bonded to the top of the inner surface of the upper foam, and the surface of the second adhesive layer is fixedly connected to the top of the vertical sound insulation cotton.

[0010] The present invention is further configured such that a damping adhesive is bonded to the top of the lower foam, and the surface of the damping adhesive is bonded to the bottom of the upper foam.

[0011] The present invention is further configured such that the sound-absorbing layer is made of polyester fiber, the transition layer is made of mineral wool, and the damping layer is made of butyl rubber.

[0012] The present invention is further configured such that one end of the micro spring is fixedly connected to the top of the inner foam, and the inclination angle of the micro spring is 60°.

[0013] The present invention is further configured such that the inner cavity of the cushioning sponge has holes, the holes being used to allow sound waves to penetrate deep into the upper and lower foam.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model forms a dynamic sound-absorbing structure through the synergistic effect of the horizontal and vertical sound-absorbing cotton and the micro spring in the noise reduction component. When sound waves enter the foam, the horizontal and vertical sound-absorbing cotton absorb high-frequency noise through the porous structure, while the micro spring vibrates under the action of sound waves, converting sound energy into mechanical energy and further dissipating it, effectively enhancing the absorption of low-frequency noise. At the same time, the composite component adopts a three-layer composite structure of sound-absorbing layer, transition layer and damping layer. By matching the acoustic impedance of different materials, the transmission loss of sound waves between different media is optimized, thereby widening the sound absorption band and making the overall sound absorption and noise reduction performance more balanced.

[0016] 2. This invention guides sound waves deep into the upper and lower foams through holes in the inner cavity of the cushioning sponge, extending the sound wave propagation path and increasing the chance of sound energy attenuation. The damping adhesive and bonding layer not only enhance structural stability but also further dissipate sound energy through the internal friction of the viscoelastic material. The micro spring adopts a 60° tilt design, which drives the vertical sound insulation cotton to produce micro-deformation when vibrating, increasing the contact area between the sound waves and the sound-absorbing material and improving energy conversion efficiency. Compared with traditional static foam, this dynamic sound absorption mechanism can adapt to noise environments of different frequencies and intensities.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0019] Figure 1 This is a three-dimensional diagram of a sound-absorbing and noise-reducing foam.

[0020] Figure 2 This is an exploded view of the internal structure of the upper and lower foam layers in a sound-absorbing and noise-reducing foam.

[0021] Figure 3 This is a schematic diagram of the internal structure of the lower foam in a sound-absorbing and noise-reducing foam.

[0022] Figure 4 This is an exploded view of the horizontal and vertical sound insulation cotton in a sound-absorbing and noise-reducing foam.

[0023] Figure 5 This is a schematic diagram of the composite component structure in a sound-absorbing and noise-reducing foam.

[0024] In the attached diagram: 1. Buffer sponge; 2. Upper foam; 3. Lower foam; 4. Horizontal sound insulation cotton; 5. Vertical sound insulation cotton; 6. Miniature spring; 7. Sound-absorbing layer; 8. Transition layer; 9. Damping layer; 10. First adhesive layer; 11. Second adhesive layer; 12. Damping adhesive; 13. Holes. Detailed Implementation

[0025] The technical solutions of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Example 1

[0026] Please see Figures 1-5 This utility model relates to a sound-absorbing and noise-reducing foam, comprising a cushioning sponge 1, which is placed on top of an upper foam 2 and is made of silicone. Besides protecting the upper foam 2, the cushioning sponge 1 also possesses sound insulation properties, further enhancing the sound insulation effect of the entire sound-absorbing and noise-reducing structure. The upper foam 2 is fixedly connected to the bottom of the cushioning sponge 1, and a lower foam 3 is located at the bottom of the upper foam 2. A noise-reducing component is provided between the upper foam 2 and the lower foam 3. The noise-reducing component includes a transverse sound-insulating cotton 4 located within the inner cavity of the lower foam 3, and a vertical sound-insulating cotton 5 fixedly connected to the top of the transverse sound-insulating cotton 4. Multiple sound-insulating cavities are formed between the transverse sound-insulating cotton 4 and the vertical sound-insulating cotton 5. A miniature spring 6 is provided. Inside the sound insulation cavity, there are miniature springs 6 fixedly connected to one side of the horizontal sound insulation cotton 4. Two miniature springs 6 are arranged opposite each other between each sound insulation cavity. They are used for sound absorption and noise reduction through the noise reduction component. The inner cavity of both the horizontal sound insulation cotton 4 and the vertical sound insulation cotton 5 is provided with a composite component. The composite component includes a sound-absorbing layer 7 fixedly connected to one side of the surface of the horizontal sound insulation cotton 4 and the vertical sound insulation cotton 5, a transition layer 8 fixedly connected to one side of the sound-absorbing layer 7, and a damping layer 9 fixedly connected to one side of the transition layer 8. The composite component is composed of three layers: the sound-absorbing layer 7, the transition layer 8, and the damping layer 9. The composite component is used to improve the sound absorption performance of the horizontal sound insulation cotton 4 and the vertical sound insulation cotton 5. Example 2

[0027] Please see Figures 1-5Based on Example 1, a first adhesive layer 10 is bonded to the bottom of the lower foam 3. The surface of the first adhesive layer 10 is fixedly connected to the bottom of both the transverse sound insulation cotton 4 and the vertical sound insulation cotton 5. A second adhesive layer 11 is bonded to the top of the upper foam 2. Both the first adhesive layer 10 and the second adhesive layer 11 are made of polyurethane adhesive to improve the bonding effect. Polyurethane adhesive has good flexibility and elasticity, which can adapt to the expansion and contraction deformation that may occur in the foam material during use, and is not prone to cracking or falling off. The surface of the second adhesive layer 11 is fixedly connected to the top of the vertical sound insulation cotton 5. A damping adhesive 12 is bonded to the top of the lower foam 3. The surface of the damping adhesive 12 is fixedly connected to the top of the upper foam 2. The bottom of foam 2 is bonded. The sound-absorbing layer 7 is made of polyester fiber, which can convert sound energy into heat energy through internal friction. The transition layer 8 is made of mineral wool, with density increasing from the surface to the inside to optimize the sound wave propagation path. The damping layer 9 is made of butyl rubber, which can dissipate low-frequency vibration energy through the movement of polymer chain segments. The sound-absorbing layer 7 absorbs high-frequency scattered sound waves, the transition layer 8 attenuates mid-frequency standing waves, and the damping layer 9 suppresses low-frequency resonance. One end of the micro spring 6 is fixedly connected to the top of the inner part of the upper foam 2. The tilt angle of the micro spring 6 is 60°. The inner cavity of the buffer sponge 1 has holes 13, which are used to allow sound waves to penetrate deep into the upper foam 2 and the lower foam 3.

[0028] The working principle of this utility model is as follows: When sound waves enter the interior of the upper foam 2 and lower foam 3 through the holes 13 of the buffer sponge 1, the sound waves are first guided to the noise reduction component between the upper foam 2 and lower foam 3. The horizontal sound insulation cotton 4 and the vertical sound insulation cotton 5 absorb high-frequency sound waves through their porous structure. At the same time, the sound-absorbing layer 7 in the composite component further converts high-frequency sound energy into heat energy through fiber friction. The transition layer 8 attenuates mid-frequency standing waves through density gradient design, while the damping layer 9 dissipates low-frequency vibration energy by utilizing the viscoelastic motion of polymer chain segments. The micro spring 6 undergoes angular tilting vibration under the action of sound waves, causing the vertical sound insulation cotton 5 to produce micro-deformation, increasing the contact area between the sound waves and the sound-absorbing material, and at the same time converting some sound energy into mechanical energy and dissipating it. The damping glue 12 and the adhesive layer further consume residual sound energy through viscoelastic internal friction. In the whole process, the sound waves undergo multiple reflections, scattering and energy conversions in the multi-layer structure and dynamic component, ultimately achieving a wide-band high-efficiency sound absorption and noise reduction effect.

[0029] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sound absorbing and noise reducing type foam, comprising a buffer sponge (1), characterized in that: The bottom of the cushioning sponge (1) is fixedly connected to an upper foam (2), and a lower foam (3) is provided at the bottom of the upper foam (2). A noise reduction component is provided between the upper foam (2) and the lower foam (3). The noise reduction component includes a transverse sound insulation cotton (4) disposed in the inner cavity of the lower foam (3), a vertical sound insulation cotton (5) fixedly connected to the top of the transverse sound insulation cotton (4), and a miniature spring (6) fixedly connected to one side of the transverse sound insulation cotton (4). The noise reduction component is used for sound absorption and noise reduction. The inner cavities of the horizontal sound insulation cotton (4) and the vertical sound insulation cotton (5) are each provided with a composite component. The composite component includes a sound-absorbing layer (7) fixedly connected to one side of the surface of the horizontal sound insulation cotton (4) and the vertical sound insulation cotton (5), a transition layer (8) fixedly connected to one side of the sound-absorbing layer (7), and a damping layer (9) fixedly connected to one side of the transition layer (8). The composite component is composed of three layers: the sound-absorbing layer (7), the transition layer (8), and the damping layer (9). The composite component is used to improve the sound absorption performance of the horizontal sound insulation cotton (4) and the vertical sound insulation cotton (5).

2. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: The bottom of the lower foam (3) is bonded with a first adhesive layer (10), and the surface of the first adhesive layer (10) is fixedly connected to the bottom of the horizontal sound insulation cotton (4) and the vertical sound insulation cotton (5).

3. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: The top of the upper foam (2) is bonded with a second adhesive layer (11), and the surface of the second adhesive layer (11) is fixedly connected to the top of the vertical sound insulation cotton (5).

4. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: The top of the lower foam (3) is bonded with damping adhesive (12), and the surface of the damping adhesive (12) is bonded to the bottom of the upper foam (2).

5. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: The sound-absorbing layer (7) is made of polyester fiber, the transition layer (8) is made of mineral wool, and the damping layer (9) is made of butyl rubber.

6. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: One end of the micro spring (6) is fixedly connected to the top of the inner foam (2), and the tilt angle of the micro spring (6) is 60°.

7. The sound-absorbing and noise-reducing foam according to claim 1, characterized in that: The inner cavity of the cushioning sponge (1) has holes (13), which are used to allow sound waves to penetrate into the upper foam (2) and the lower foam (3).

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