Sound absorption block, sound production module and electronic equipment

Abstract

The utility model provides a sound-absorbing block, sound production module and electronic equipment, the sound-absorbing block includes: a three-dimensional frame structure including a plurality of sound-absorbing materials and organic fiber, the organic fiber is heated and softened to form an adhesion layer on its surface, the adjacent organic fibers and the organic fibers and the sound-absorbing material are connected through an adhesive layer to form a three-dimensional frame structure, the sound-absorbing material comprises porous raw powder and / or sound-absorbing particles, and each sound-absorbing particle comprises multiple pieces of porous raw powder and an adhesive for bonding the multiple pieces of porous raw powder into a whole; the average particle size of the porous raw powder is 0.1-30 [mu] m, and the particle size of the sound-absorbing particles is 50-800 [mu] m. In the embodiment of the utility model, the porous raw powder and / or the sound-absorbing particles are adopted to form the sound-absorbing material, and the three-dimensional frame structure is adopted, so that the sound-absorbing effect of the sound-absorbing block can be improved. The sound-absorbing block is arranged in the rear sound cavity of the sound production module, so that the sound-absorbing material is prevented from colliding, crushing and falling into the sound production module to influence the acoustic performance when the sound production module works at a relatively large amplitude.

Description

Technical Field

[0001] The utility model belongs to the technical field of acoustics. Specifically, it relates to a sound absorption block, a sound generating module with the sound absorption block, and an electronic device. Background Art

[0002] In recent years, under the general trend of the increasing thinning of electronic products, the space left for speakers is getting smaller and smaller. Therefore, the micro speaker module tends to be flat-designed, resulting in a reduction in the cavity volume of the acoustic rear sound cavity. To solve the problem of the reduction in the low-frequency performance of the speaker caused by the reduction in space, technicians fill the rear sound cavity with sound absorption particles made of porous materials (such as activated carbon, natural zeolite powder, activated silica, porous alumina, molecular sieve, or a mixture made according to specific types and ratios, etc.). By using the special physical pore structure inside the porous material to quickly adsorb and desorb the gas in the rear sound cavity, the effect of virtual increase in the resonance space in the acoustic rear sound cavity of the speaker is achieved, thereby effectively reducing the resonance frequency F0 of the speaker and improving the low-frequency sensitivity.

[0003] However, in the above solution, when the speaker is in a high-power working state, the sound absorption particles filled in the speaker sound cavity are prone to deformation and breakage due to mutual collision and friction. The broken dust enters the sounding element, causing abnormal operation, resulting in an increase in F0 and poor low-frequency effect. Moreover, the resonance cavity space of some micro speakers is very small, with an irregular shape and serious particle static electricity. It is difficult to fill the sound absorption particles in such a narrow resonance cavity. Summary of the Utility Model

[0004] An object of the utility model is to provide a sound absorption block, which can at least solve the technical problem that the sound absorption particles in the rear sound cavity of the existing speaker are prone to produce broken powder under the working condition of a large amplitude.

[0005] The utility model also proposes a sound generating module, including the above-mentioned sound absorption block.

[0006] The utility model also proposes an electronic device, including the above-mentioned sound generating module.

[0007] According to the first aspect of the utility model, there is provided a sound absorption block, including: a three-dimensional frame structure, the three-dimensional frame structure includes a plurality of sound absorption materials and organic fibers, the organic fibers are softened by heat to form an adhesion layer on their surfaces, and adjacent organic fibers and between the organic fibers and the sound absorption materials are connected through the adhesion layer to form the three-dimensional frame structure. The sound absorption materials include porous raw powder and / or sound absorption particles, and each sound absorption particle includes a plurality of porous raw powders and an adhesive for bonding the plurality of porous raw powders into one body; the average particle size of the porous raw powder is 0.1μm - 30μm, and the particle size of the sound absorption particle is 50μm - 800μm.

[0008] Optionally, the three-dimensional frame structure has a three-dimensional network structure, wherein part of the sound-absorbing material is adhered to the outer surface of the three-dimensional frame structure, and part of the sound-absorbing material is located inside the three-dimensional frame structure.

[0009] Optionally, the porous raw powder includes at least one porous material selected from activated carbon, zeolite powder, silica, porous alumina, molecular sieve, metal-organic framework material, aerogel, and COF.

[0010] Optionally, the sound-absorbing block has a plurality of first-level pores and second-level pores, wherein each of the porous raw powders has the first-level pores, and at least one of the spaces between the plurality of porous raw powders, between the sound-absorbing particles and the organic fibers, and between the organic fibers forms the second-level pores.

[0011] Optionally, the organic fiber is at least one of fiber fabric, non-woven fabric, and hot-melt web; or, the organic fiber includes at least one of polyamide fiber, polyester fiber, polyurethane fiber, polyolefin fiber, polyvinyl acetal fiber, polyacrylonitrile fiber, polylactic acid fiber, polyether ether ketone fiber, and polyphenylene sulfide fiber.

[0012] Optionally, the mass ratio of the organic fiber in the sound-absorbing block is 2%-60%.

[0013] Optionally, the softening point of the organic fiber is greater than or equal to 80 °C.

[0014] Optionally, the total pore volume of the sound-absorbing block is greater than 0.1 mL / g.

[0015] According to a second aspect of the present invention, there is provided a sound generating module, including a sound generating element, a housing, and an internal cavity surrounded by the housing and the sound generating element, wherein the internal cavity is filled with the sound-absorbing block according to any one of the above.

[0016] According to a third aspect of the present invention, there is provided an electronic device, including the sound generating module according to any one of the above.

[0017] In the embodiment of the present utility model, a sound-absorbing material is composed of porous raw powder and / or sound-absorbing particles. The three-dimensional framework structure has a three-dimensional structure, with advantages such as three-dimensionality and a large specific surface area, and can adhere more sound-absorbing materials, thereby improving the sound-absorbing effect of the sound-absorbing block by increasing the total amount of the sound-absorbing material. Moreover, by adhesively connecting adjacent organic fibers and between the organic fibers and the sound-absorbing material, not only can the porous raw powder be prevented from falling off the sound-absorbing block, but also it is convenient to form a whole sound-absorbing block. Placing the sound-absorbing block of the present utility model in the rear sound cavity of the sound generating module, the overall block-shaped sound-absorbing block is conducive to complete conformal shaping in the rear sound cavity, eliminating the flow and friction of the sound-absorbing particles in the rear sound cavity, being able to reduce the movement of the sound-absorbing material in the rear sound cavity, solving the technical problem that the sound-absorbing particles are prone to breakage, and avoiding the collision and powder entering the interior of the sound generating module of the broken sound-absorbing particles when the sound generating module operates at a large amplitude, which affects the acoustic performance. And, by using the porous raw powder with an average particle size of 0.1 μm - 30 μm, it can ensure that the porous raw powder is convenient to prepare and has a good sound-absorbing effect. And, the particle size of the sound-absorbing particles is 50 μm - 800 μm, and the use range of the particle size of the sound-absorbing particles is wide, greatly improving the use efficiency of the sound-absorbing particles and reducing the cost.

[0018] Other features and advantages of the present utility model will become clear from the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0020] Figure 1 is a cross-sectional view of the sound-absorbing block of an embodiment of the present utility model;

[0021] Figure 2 is a cross-sectional view of the sound-absorbing block of an embodiment of the present utility model;

[0022] Figure 3 is a schematic diagram of the sound generating module of an embodiment of the present utility model;

[0023] Figure 4 is the IMP curve before the reliability test of Example 1 and Comparative Example 1;

[0024] Figure 5 is the IMP curve after the reliability test of Example 1 and Comparative Example 1;

[0025] Figure 6 is the IMP curve before the reliability test of Example 2 and Comparative Example 2;

[0026] Figure 7It is the IMP curve after the reliability experiment of Example 2 and Comparative Example 2.

[0027] Reference numeral

[0028] Sound generating module 100;

[0029] Housing 10; Rear sound cavity 11;

[0030] Sound generating element 20;

[0031] Sound absorbing block 30; Organic fiber 31; Sound absorbing particles 32; Porous raw powder 321. Detailed implementation manners

[0032] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present utility model and its application or use.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said techniques, methods, and devices should be regarded as part of the specification.

[0035] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] The sound absorbing block 30 according to the embodiment of the present utility model will be described in detail below with reference to the accompanying drawings.

[0038] As Figure 1As shown, the sound-absorbing block 30 according to an embodiment of the present invention includes: a three-dimensional frame structure, the three-dimensional frame structure includes a plurality of sound-absorbing materials and organic fibers 31. The organic fibers 31 are softened by heat to form an adhesive layer on their surfaces. The adjacent organic fibers 31 and between the organic fibers 31 and the sound-absorbing materials are connected through the adhesive layer to form a three-dimensional frame structure. The sound-absorbing materials include porous raw powder 321 and / or sound-absorbing particles 32. Each sound-absorbing particle 32 includes a plurality of porous raw powder 321 and an adhesive for bonding the plurality of porous raw powder 321 into one body. The average particle size of the porous raw powder 321 is 0.1 μm - 30 μm, and the particle size of the sound-absorbing particles 32 is 50 μm - 800 μm. The sound-absorbing block 30 according to an embodiment of the present invention can be applied to a speaker module. For example, when the sound-absorbing block 30 is applied to the inside of the rear sound cavity 11 of the housing 10, it can achieve a sound-absorbing effect, thereby increasing the virtual volume of the rear sound cavity 11 and improving the low-frequency performance of the sound-emitting module 100.

[0039] In other words, the sound-absorbing block 30 according to an embodiment of the present invention is mainly composed of a three-dimensional frame structure, and the three-dimensional frame structure can be formed by the cooperation of organic fibers 31 and sound-absorbing materials. Specifically, as Figure 1 and Figure 2 shown, the surface of the organic fibers 31 has adhesiveness after being heated, which not only enables the adjacent organic fibers 31 to be connected to each other, but also allows the sound-absorbing materials to adhere to the surface of the organic fibers 31. That is to say, the three-dimensional frame structure can be formed by connecting the adjacent organic fibers 31 and between the organic fibers 31 and the sound-absorbing materials through the adhesive layer. That is to say, the sound-absorbing block 30 according to an embodiment of the present invention can be prepared from organic fibers 31 and sound-absorbing materials as raw materials. It can be understood that there is not only the bonding between the organic fibers 31 and the sound-absorbing materials in the three-dimensional frame structure, but also the bonding connection between the adjacent organic fibers 31.

[0040] Among them, the sound-absorbing materials include porous raw powder 321 and / or sound-absorbing particles 32. That is to say, the sound-absorbing materials can be composed of the porous raw powder 321 alone, or composed of the sound-absorbing particles 32 alone, or composed of the porous raw powder 321 and the sound-absorbing particles 32 together.

[0041] The porous raw powder 321 is a porous material. The surface of the porous raw powder 321 has pores, and air can flow into the pores, so that the porous raw powder 321 has a sound absorption effect. Each sound absorption particle 32 can be prepared from a plurality of porous raw powders 321 and an adhesive. Specifically, the adhesive has an adhesive effect, and a plurality of porous raw powders 321 can be bonded and formed by the adhesive. Since the porous raw powder 321 has a sound absorption effect, the sound absorption particles 32 and the sound absorption block 30 containing the porous raw powder 321 also have a sound absorption effect. In addition, when there is a gap between the porous raw powders 321 or when there is a gap between the sound absorption particles 32 and the organic fiber 31, air can flow into the above gaps, further improving the sound absorption effect of the sound absorption block 30. That is to say, the sound absorption particles 32 can utilize the adsorption and desorption of air by the pore structure of the porous raw powder 321, the gap between adjacent porous raw powders 321, and the gap between the porous raw powder 321 and the organic fiber 31, so as to play a role in expanding the virtual volume.

[0042] The average particle size of the porous raw powder 321 is 0.1 μm - 30 μm. If the average particle size of the porous raw powder 321 is too small, the specific surface area of the porous raw powder 321 is relatively large, and the number of adhesions to the organic fiber 31 is small, resulting in a small content of the porous raw powder 321 in the sound absorption block 30 and affecting the acoustic effect of the sound absorption block 30. If the average particle size of the porous raw powder 321 is too large, the pore channels are relatively long, the air inlet and outlet paths become longer, which is likely to affect the acoustic effect; if the average particle size of the porous raw powder 321 is too large, it is also likely to affect the bonding stability and reduce the stability of the overall block structure. Therefore, in this embodiment, the average particle size of the porous raw powder 321 is 0.1 μm - 30 μm. For example, the average particle size of the porous raw powder 321 is 0.1 μm, 1 μm, 5 μm, 10 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm or 30 μm, etc. The particle size range of the porous raw powder 321 is wide, greatly improving the use efficiency of the porous raw powder 321 and reducing the cost; moreover, it can ensure that the porous raw powder 321 has both sound absorption effect and structural strength; and using the porous raw powder 321 within the above particle size range is beneficial to its connection with the adhesion layer on the surface of the organic fiber 31.

[0043] In this embodiment, the particle size of the sound-absorbing particles 32 is 50 μm - 800 μm. For example, the particle size of the sound-absorbing particles 32 is 50 μm, 80 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, or 800 μm, etc. It can be understood that when the sound-absorbing particles 32 and the organic fibers 31 are bonded into the sound-absorbing block 30 outside the housing 10, there is no need to consider whether the sound-absorbing particles 32 will pass through the breathable separator of the sound generating module 100. Therefore, the particle size range of the sound-absorbing particles 32 can be relatively large. If the particle size of the sound-absorbing particles 32 is too large, it will increase the difficulty of forming an integral block, and the formed sound-absorbing block 30 will be relatively large in volume. The volume of the rear sound cavity 11 is limited, making it difficult to assemble the housing 10 with the relatively large-sized sound-absorbing block 30. In this embodiment, by using the sound-absorbing particles 32 within the above particle size range, not only is the range of the particle size of the sound-absorbing particles 32 wide, greatly improving the utilization efficiency of the sound-absorbing particles 32 and reducing costs, but also it is ensured that the sound-absorbing particles 32 are easily adapted to the speaker module and have a good sound-absorbing effect. In addition, it is beneficial to form an integral block structure, and it can effectively prevent the sound-absorbing particles 32 from being pulverized and entering the interior of the sound generating module 100, which is beneficial to ensuring the acoustic performance of the sound generating module 100.

[0044] Thus, in the embodiment of the present utility model, by using the porous raw powder 321 and / or the sound-absorbing particles 32 to form the sound-absorbing material, and the three-dimensional frame structure has a three-dimensional structure with advantages such as stereoscopicity and a large specific surface area, more sound-absorbing material can be attached, thereby improving the sound-absorbing effect of the sound-absorbing block 30 by increasing the total amount of the sound-absorbing material. Moreover, by using the organic fibers 31 to be softened by heat so that the adjacent organic fibers 31 and between the organic fibers 31 and the sound-absorbing material are adhesively connected, and it is convenient to form a whole sound-absorbing block 30, an integral sound-absorbing block 30. Placing the sound-absorbing block 30 of the present utility model in the rear sound cavity 11 of the sound generating module 100, the integral block structure is beneficial to fully conform to the shape in the rear sound cavity 11, eliminating the flow and friction of the sound-absorbing particles 32 in the rear sound cavity 11, reducing the movement of the sound-absorbing material in the rear sound cavity 11, solving the technical problem that the sound-absorbing particles 32 are prone to breakage, and avoiding the sound-absorbing material from colliding and pulverizing and entering the interior of the sound generating module 100 during the operation of the sound generating module 100 at a large amplitude, which affects the acoustic performance. And, by using the average particle size of the porous raw powder 321 to be 0.1 μm - 30 μm, it can ensure that the porous raw powder 321 is easy to prepare and has a good sound-absorbing effect. And, the particle size of the sound-absorbing particles 32 is 50 μm - 800 μm, the range of the particle size of the sound-absorbing particles 32 is wide, greatly improving the utilization efficiency of the sound-absorbing particles 32 and reducing costs.

[0045] According to an embodiment of the present utility model, the three-dimensional frame structure has a three-dimensional network structure, wherein part of the sound-absorbing material is adhered to the outer surface of the three-dimensional frame structure, and part of the sound-absorbing material is located inside the three-dimensional frame structure. That is to say, in this embodiment, the three-dimensional frame structure can be a three-dimensional network structure, which not only has a three-dimensional structure but also a network structure. The sound-absorbing material can be adhered to the outer surface of the three-dimensional frame structure or distributed inside the three-dimensional frame structure, that is, distributed in the three-dimensional network structure, that is, part of the sound-absorbing material is adhered to the outer surface of the three-dimensional frame structure, and another part of the sound-absorbing material is located inside the three-dimensional network structure. It should be noted that by adopting the three-dimensional network structure, it is beneficial for air to enter the inside of the three-dimensional frame structure, so that the porous raw powder 321 of the sound-absorbing material located inside the three-dimensional network structure, the gaps between the multiple porous raw powders 321, and the gaps between the sound-absorbing material and the three-dimensional frame structure can also be in full contact with air, thereby improving the sound-absorbing effect of the sound-absorbing block 30.

[0046] It should be noted that the inside of the three-dimensional frame structure in this embodiment has a receiving space, and part of the sound-absorbing material is located in the receiving space. It can be understood that when the mixture of the organic fiber 31 and the sound-absorbing material is heated, when only the sound-absorbing material is in contact with the periphery of part of the sound-absorbing material and not in contact with the organic fiber 31, the adhesion layer formed on the surface of the organic fiber 31 when it is heated and softened only adheres to the adjacent sound-absorbing material. Therefore, when the three-dimensional frame structure is formed, there will be part of the sound-absorbing material located inside the three-dimensional frame structure. However, the main body of the three-dimensional frame structure has a ventilation function, so the sound-absorbing material located inside the three-dimensional frame structure can also adsorb and desorb air to achieve the sound-absorbing effect.

[0047] In some specific embodiments of the present utility model, the porous raw powder 321 includes at least one porous material such as activated carbon, zeolite powder, silica, porous alumina, molecular sieve, metal-organic framework material, aerogel, and COF. By using the above-mentioned porous materials as the porous raw powder 321, it can be ensured that the porous raw powder 321 has a good sound-absorbing effect and can be connected to the adhesion layer on the surface of the organic fiber 31.

[0048] According to an embodiment of the present utility model, the sound-absorbing block 30 has a plurality of first-level pores and second-level pores. Among them, each porous raw powder 321 has a first-level pore respectively, and at least one of the spaces between the multiple porous raw powders 321, between the sound-absorbing particles 32 and the organic fiber 31, and between the organic fiber 31 and the organic fiber 31 forms a second-level pore.

[0049] That is to say, the sound-absorbing block 30 has both first-level pores and second-level pores at the same time. The sound-absorbing block 30 has a rich multi-level pore structure, which can increase the pore volume, make the gas flow in and out more smoothly, further improve the sound-absorbing effect of the sound-absorbing block 30, and thus make the acoustic performance excellent.

[0050] In some specific embodiments of the present utility model, the organic fiber 31 is at least one of fiber fabric, non-woven fabric, hot melt web, etc.

[0051] In this embodiment, by using the above materials as the source of the organic fiber 31, it is convenient to form a three-dimensional framework after heating. That is to say, the organic fiber 31 can exist in the form of fiber fabric, non-woven fabric, hot melt web, etc. When adopting the process of laying layer by layer and then heating, for example, a layer of sound-absorbing material is interposed between the lower organic fiber 31 and the upper organic fiber 31. It can be seen that by using the organic fiber 31 in the above form, it is not only convenient to lay the organic fiber 31, but also convenient to lay the sound-absorbing material on the organic fiber 31, thereby being able to reduce the manufacturing process cost of the sound-absorbing block 30, and being beneficial to controlling the total thickness of the sound-absorbing block 30. When adopting the spray melting preparation process, for example, the organic fiber 31 is heated to soften, and the softened organic fiber 31 and the sound-absorbing material are sprayed out simultaneously, so that the sound-absorbing material is evenly distributed on the organic fiber 31. By using the organic fiber 31 in the above form, it is not only convenient to place the organic fiber 31 in the equipment, but also beneficial to expanding the source of the organic fiber 31 and reducing the production cost. In addition, by using the above fiber fabric, non-woven fabric, hot melt web, etc. as the organic fiber 31, the structural strength of the sound-absorbing block 30 can also be enhanced, and the overall structure of the sound-absorbing block 30 can be strengthened, which can ensure that the sound-absorbing block 30 is not easily broken during the oscillation, dropping, etc. of the sound generating module 100.

[0052] In some specific embodiments of the present utility model, the organic fiber 31 includes at least one of polyamide fiber, polyester fiber, polyurethane fiber, polyolefin fiber, polyvinyl acetal fiber, polyacrylonitrile fiber, polylactic acid fiber, polyether ether ketone fiber, polyphenylene sulfide fiber, etc. In this embodiment, by using the above materials as the organic fiber 31, it is beneficial to form a three-dimensional framework structure by heating, and an adhesion layer can be softened on the surface of the organic fiber 31.

[0053] Among them, when the organic fiber 31 is heated together with the outer shell 10 inside the outer shell 10, the softening point of the organic fiber 31 can be slightly lower than the maximum tolerable temperature of the components such as the outer shell 10 and the diaphragm in the sound generating module 100, so that heating the outer shell 10 will not affect the outer shell 10 itself and the internal components, etc. When the organic fiber 31 and the sound-absorbing material are heated to form the sound-absorbing block 30 and then installed into the outer shell 10, the range of the softening point of the organic fiber 31 can be higher, and the selection of the organic fiber 31 is more extensive, for example, more types of polymer particles are selected.

[0054] According to an embodiment of the present utility model, the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 2%-60%. That is to say, the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 2%-60%. It should be noted that if the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is too small, it is easy to cause a small total amount of the adhesive layer, resulting in poor adhesion between adjacent organic fibers 31 or part of the sound-absorbing material, and it is easy to appear the phenomenon of powder falling; if the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is too large, it is easy to affect the acoustic effect due to the excessive content of the organic fiber 31. In this embodiment, the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 2%-60%. For example, the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 2%, 5%, 10%, 15%, 20%, 30%, 40%, 50% or 60%, etc. It can not only ensure the sound-absorbing effect of the sound-absorbing block 30, but also ensure the structural strength of the sound-absorbing block 30 and prevent the sound-absorbing material from falling off the sound-absorbing block 30.

[0055] In some specific embodiments of the present utility model, the softening point of the organic fiber 31 is greater than or equal to 80°C. It should be noted that if the softening point of the organic fiber 31 is too low, it is easy to cause the organic fiber 31 to melt and flow at a lower temperature, thus blocking the pore structure of the sound-absorbing material and affecting the sound-absorbing effect of the sound-absorbing block 30, and further affecting the acoustic performance of the sound generating module 100. It can be seen that in this embodiment, the softening point of the organic fiber 31 is greater than or equal to 80°C. For example, the softening point of the organic fiber 31 is 80°C, 85°C, 90°C, 95°C, 100°C or 110°C, etc., which can ensure that the sound-absorbing block 30 has a good sound-absorbing effect during daily use. In addition, after the organic fiber 31 and the sound-absorbing particles 32 are heated to form the sound-absorbing block 30 and then installed in the housing 10 of the sound generating module 100, the range of the softening point of the organic fiber 31 can be higher than the maximum tolerable temperature of the housing 10, the diaphragm and other components in the sound generating module 100, and the selection of the organic fiber 31 is more extensive, such as choosing more types of materials.

[0056] It should be noted that by selecting materials, contents, softening points, etc. of the organic fiber 31 that meet at least one of the above conditions, different needs of users for products can be met.

[0057] According to an embodiment of the present utility model, the adhesive includes at least one of an organic adhesive and an inorganic adhesive. Among them, the organic adhesive includes at least one of polyacrylate, polyurethane, and silicone; and / or, the inorganic adhesive includes at least one of silicate, silica sol, aluminum sol, phosphate, sulfate, and borate. That is to say, in this embodiment, the adhesive can be selected from organic adhesives and / or inorganic adhesives, with a wide selection range. Among them, when the adhesive contains an organic adhesive, the organic adhesive can be selected from polyacrylate, polyurethane, silicone, etc. When the adhesive contains an inorganic adhesive, the inorganic adhesive can be selected from silicate, silica sol, aluminum sol, phosphate, sulfate, and borate, etc. In this embodiment, by using the above materials as the adhesive, it is possible to effectively prevent the porous raw powder 321 from falling off the sound-absorbing particles 32.

[0058] According to an embodiment of the present utility model, the total pore volume of the sound-absorbing block 30 is greater than 0.1 mL / g. It should be noted that if the total pore volume of the sound-absorbing block 30 is too small, it is easy to cause the sound-absorbing effect of the sound-absorbing block 30 to be not obvious. Therefore, in this embodiment, the total pore volume of the sound-absorbing block 30 is greater than 0.1 mL / g. For example, the total pore volume of the sound-absorbing block 30 is 0.15 mL / g, 0.5 mL / g, 1 mL / g, 2 mL / g, 5 mL / g, or 10 mL / g, etc. The air flow can smoothly enter the sound-absorbing block 30, which is beneficial to ensuring that the sound-absorbing block 30 has a good sound-absorbing effect.

[0059] As Figure 3 shown, the present utility model also provides a sound generating module 100, including a sound generating element 20, a housing 10, and an internal cavity surrounded by the housing 10 and the sound generating element 20. The internal cavity is filled with the sound-absorbing block 30 according to any one of the above embodiments, and this sound-absorbing block 30 can be used as an acoustic improvement material. For example, the sound generating element 20 divides the housing 10 into a front sound cavity and a rear sound cavity 11, and the sound-absorbing block 30 is filled in the rear sound cavity 11. Optionally, the sound-absorbing block 30 can be attached to the inner wall of at least one side of the rear sound cavity 11 by double-sided tape or restricted in the cavity of the rear sound cavity 11 of the speaker module by a space limiting effect. Since the sound-absorbing block 30 of the embodiment of the present utility model has good acoustic stability, the sound generating module 100 of the embodiment of the present utility model also has the same advantages, which will not be elaborated here. Optionally, the sound generating element 20 can be a speaker element, and at this time, the sound generating module 100 can be a speaker module.

[0060] The present utility model also provides an electronic device, which includes the sound generating module 100 according to any one of the above embodiments. Since the sound generating module 100 of any one of the above embodiments has a good sound generating effect, the electronic device of the embodiments of the present utility model also has the same advantages, which will not be elaborated herein. Optionally, the electronic device may be a mobile phone, a laptop computer, a PAD, a television, a smart wearable device, or the like.

[0061] The present utility model also provides a preparation method for the sound absorption block 30. The preparation method includes the following steps:

[0062] Lay a plurality of organic fiber layers and sound absorption material layers in sequence. The sound absorption material layer includes a plurality of sound absorption particles 32 laid on the organic fiber layer. Among them, a sound absorption material layer is respectively provided between any two organic fiber layers;

[0063] Perform heat treatment on the organic fiber layer to soften the organic fiber layer and adhere to the sound absorption material layer;

[0064] Cool the organic fiber layer to obtain the sound absorption block 30.

[0065] In other words, the present utility model also provides a preparation method for the sound absorption block 30. The preparation method mainly includes the following steps:

[0066] First, lay the organic fiber layer and the sound absorption material layer in sequence. For example, lay a layer of organic fiber layer in the tooling, then lay the sound absorption material layer on this layer of organic fiber layer, and then lay the organic fiber layer on the sound absorption material layer, and so on in a cycle. Among them, the sound absorption material layer includes a plurality of sound absorption materials. When laying the sound absorption material layer on the organic fiber layer, that is, laying the sound absorption materials on the organic fiber layer. When the total number of organic fiber layers is two, a sound absorption material layer is provided between the two organic fiber layers; when the total number of organic fiber layers is three, for example, including an upper organic fiber layer, a middle organic fiber layer, and a lower organic fiber layer, a layer of sound absorption material layer is provided between the upper organic fiber layer and the middle organic fiber layer, and another layer of sound absorption material layer is provided between the middle organic fiber layer and the lower organic fiber layer.

[0067] Subsequently, heat the organic fiber layer to soften the surface layer of the organic fiber layer and form an adhesion layer on the surface of the organic fiber layer. The sound absorption materials can be bonded through the adhesion layer. That is to say, the organic fiber layer is softened to adhere to the sound absorption material layer.

[0068] Then, cool the organic fiber layer to obtain the sound absorption block 30.

[0069] Optionally, the organic fiber layer can be laid flat in the tooling first, the sound-absorbing material is evenly laid on the organic fiber layer, and the organic fiber layer is continuously laid flat on the sound-absorbing material layer. Repeat the above steps, and the organic fiber layer and the sound-absorbing material layer are arranged in an alternating laminated manner; subsequently, heat treatment is carried out under set conditions. During the heat treatment process, the surface of the organic fiber 31 softens and adheres to the sound-absorbing material. Thus, adjacent organic fibers 31 and between the organic fiber 31 and the sound-absorbing material are connected through an adhesion layer to form a three-dimensional framework structure; then cooling is carried out to obtain a sound-absorbing block 30 with a three-dimensional network structure and having a sound-absorbing effect.

[0070] Optionally, the prepared sheet can be cut according to the shape of the rear sound cavity 11 for use, which is convenient for applying to a variety of sound-emitting modules 100.

[0071] According to an embodiment of the present invention, the organic fiber layer is two layers, and the areal density range of each organic fiber layer is 20 g / m 2 -100 g / m 2 . That is to say, the total number of layers of the organic fiber layer is two layers. When preparing the sound-absorbing block 30, before heating, a sound-absorbing material layer is laid between the two organic fiber layers. After heating, the sound-absorbing material can be on the surface of the organic fiber layer or inside the organic fiber layer. In this embodiment, both surfaces of the sound-absorbing block 30 are organic fiber layers. For example, the upper surface and the lower surface are both organic fiber layers, that is, each organic fiber layer serves as the surface structure of the sound-absorbing block 30. At this time, if the areal density of the organic fiber layer is too small, the bonding effect of the sound-absorbing material is poor, and the sound-absorbing material is easy to fall off from the sound-absorbing block 30; if the areal density is too large, it will cause poor air permeability of the organic fiber layer, and the air flow is difficult to smoothly enter the sound-absorbing block 30, which is easy to affect the sound-absorbing effect of the sound-absorbing block 30. In addition, the areal densities of the two organic fiber layers can be the same or different, and can be selected according to product requirements. In this embodiment, the organic fiber layer is two layers, and the areal density range of each organic fiber layer is 20 g / m 2 -100 g / m 2 , for example, the areal density range of each organic fiber layer is 20 g / m 2 、30 g / m 2 、40 g / m 2 、50 g / m 2 、60 g / m 2 、80 g / m 2 or 100 g / m 2 etc., which can not only prevent the sound-absorbing material from falling off from the sound-absorbing block 30, but also ensure that the sound-absorbing block 30 has a good sound-absorbing effect.

[0072] In some specific embodiments of the present invention, the organic fiber layer includes at least three layers, wherein the areal density range of the outermost organic fiber layer is 20 g / m2 -100 g / m 2 The areal density range of the organic fiber layer located between two sound-absorbing material layers is 1 g / m 2 -60 g / m 2 .

[0073] That is to say, the number of layers of the organic fiber layer is at least three. When preparing the sound-absorbing block 30, before heating, a layer of sound-absorbing material layer is laid between two adjacent organic fiber layers. After heating the organic fiber layer, the sound-absorbing material layer can adhere to the surface or inside of the organic fiber layer.

[0074] For the sake of convenience of description, it is described by taking the total number of layers of the organic fiber layer as three layers as an example.

[0075] The sound-absorbing block 30 includes three layers of organic fiber layers, specifically, an upper organic fiber layer, a middle organic fiber layer, and a lower organic fiber layer.

[0076] Among them, the upper organic fiber layer and the lower organic fiber layer respectively serve as the surfaces of the sound-absorbing block 30, and the areal densities of the upper organic fiber layer and the lower organic fiber layer are 20 g / m 2 -100 g / m 2 , and the areal densities of the upper organic fiber layer and the lower organic fiber layer can be the same or different. For example, the areal density of the upper organic fiber layer and / or the lower organic fiber layer is 20 g / m 2 , 30 g / m 2 , 40 g / m 2 , 50 g / m 2 , 90 g / m 2 or 100 g / m 2 etc., which can ensure that the surfaces of the sound-absorbing block 30 have good air permeability and structural stability, so that the sound-absorbing block 30 has good sound-absorbing effect and is not prone to the phenomenon of powder breakage.

[0077] In addition, the areal density range of the middle organic fiber 31 is 1 g / m 2 -60 g / m 2 , for example, the areal density range of the middle organic fiber 31 is 1 g / m 2 , 5 g / m 2 , 10 g / m 2 , 20 g / m 2 , 30 g / m 2 , 40 g / m 2 , 50 g / m 2 or 60 g / m 2If the surface density of the organic fiber layer that is not the outermost layer is too large, it is likely to cause the thickness of the sound absorption block 30 to be relatively thick, and it is likely to cause poor air permeability of the organic fiber layer that is not the outermost layer, thereby affecting the sound absorption effect of the sound absorption block 30 and further affecting the acoustic effect of the sound generating module 100.

[0078] Therefore, in this embodiment, the surface density range of the organic fiber layer located on the outermost side is 20 g / m 2 -100 g / m 2 , and the surface density range of the organic fiber layer located between the two sound absorption material layers is 1 g / m 2 -60 g / m 2 , which can not only ensure the sound absorption effect of the sound absorption block 30, but also prevent the phenomenon of powder breakage.

[0079] In some specific embodiments of the present utility model, the thickness of the organic fiber layer is 0.001 mm - 5 mm. It should be noted that if the thickness of the organic fiber layer is too small, it is likely to affect the structural strength of the organic fiber layer, resulting in the sound absorption material being easily detached from the sound absorption block 30; if the thickness of the organic fiber layer is too large, it is likely to cause the overall thickness of the sound absorption block 30 to be relatively large, and it is likely to cause poor air permeability of the organic fiber layer, making it difficult for air flow to smoothly enter the sound absorption block 30, resulting in poor sound absorption effect of the sound absorption block 30. In this embodiment, the thickness of the organic fiber layer is 0.001 mm - 5 mm. For example, the thickness of the organic fiber layer is 0.001 mm, 0.002 mm, 0.005 mm, 0.009 mm, 0.01 mm, 0.05 mm, 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm or 5 mm, etc., which can enable the sound absorption block 30 to have both good structural strength and sound absorption effect, and can also prevent the phenomenon of powder breakage.

[0080] According to an embodiment of the present utility model, the heat treatment includes heating, thermal radiation or light radiation. It can be seen that the surface of the organic fiber 31 can be softened in various ways.

[0081] The present utility model also provides a preparation method for the sound absorption block 30, and the preparation method includes the following steps:

[0082] Place the organic fiber 31 in the first spraying device and heat it to the set temperature. The organic fiber 31 is softened by heat, and place the sound absorption material in the second spraying device;

[0083] The first spraying device sprays the softened organic fiber 31 outward under the first set pressure, and the second spraying device sprays the sound absorption material outward under the second set pressure. The sprayed sound absorption material is evenly distributed on the surface of the sprayed organic fiber 31, and the sound absorption block 30 is obtained after cooling.

[0084] In other words, the present utility model also provides a method for preparing the sound-absorbing block 30. This preparation method can be used to prepare the sound-absorbing block 30 of any of the above embodiments, and specifically may include the following steps:

[0085] First, place the unsoftened organic fiber 31 in the first spraying device, and then heat the organic fiber 31. When the organic fiber 31 is heated, the surface of the organic fiber 31 will soften. And, place the sound-absorbing material in the second spraying device for standby.

[0086] Subsequently, spray the surface-softened organic fiber 31 outward through the first spraying device, and spray the sound-absorbing material outward through the second spraying device. The ejected organic fiber 31 and the ejected sound-absorbing material are combined with each other, and finally the ejected sound-absorbing material can be evenly distributed on the surface of the ejected organic fiber 31.

[0087] Finally, cool the whole composed of the sound-absorbing material and the organic fiber 31 to obtain the sound-absorbing block 30.

[0088] For example, the organic fiber 31 adopts a meltblown preparation process. During the preparation process, the sound-absorbing material is bonded to the fiber filaments along with the hot air flow.

[0089] Optionally, the sheet prepared by the above process can be cut according to the shape of the rear sound cavity 11 for use, which is convenient for adapting to the sound generating modules 100 of various shapes.

[0090] Optionally, the granulation method of the sound-absorbing material includes spray drying granulation, fluidized bed granulation, freeze drying granulation, stirring granulation, etc., and the sound-absorbing material can be prepared by various methods.

[0091] The sound generating module 100 of the present utility model will be described in detail below with specific embodiments and comparative examples. It should be understood that the following description is only exemplary and not a specific limitation of the present utility model.

[0092] Example 1

[0093] First, prepare the sound-absorbing block 30, and the specific production steps are as follows:

[0094] (1) Lay the PP non-woven fabric of 20 g / m 2 on the tooling, and evenly lay a plurality of sound-absorbing particles 32 on the PP non-woven fabric. The average particle size of the sound-absorbing particles 32 is between 100 μm and 200 μm. The sound-absorbing particles 32 are prepared from ZSM-5 molecular sieve and water-soluble acrylate adhesive. Then, lay 8 g / m 2For the PP non-woven fabric, repeat the above steps so that the non-woven fabric and the sound-absorbing particles 32 are arranged alternately, with a total of five layers (specifically, PP non-woven fabric + sound-absorbing particles 32 + PP non-woven fabric + sound-absorbing particles 32 + PP non-woven fabric), to obtain the pretreated sound-absorbing block 30. That is, for the organic fiber layer on the outermost side of the pretreated sound-absorbing block 30, PP non-woven fabric of 20 g / m 2 is selected, and for the middle organic fiber layer, PP non-woven fabric of 8 g / m 2 is selected. The sound-absorbing particles 32 are prepared from ZSM-5 molecular sieve and water-soluble acrylate adhesive. The average particle size of the ZSM-5 molecular sieve is about 2 μm, and the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 20%.

[0095] (2) Cover the pretreated sound-absorbing block 30 obtained in step (1) with a tooling plate and place it in an oven at 130 °C for 0.5 h. During the heat treatment process, the organic fiber 31 softens and melts to adhere to the sound-absorbing particles 32; the heat-treated sound-absorbing block 30 is obtained. The sound-absorbing block 30 prepared in the example has a three-dimensional network structure;

[0096] Step three: After the heat-treated sound-absorbing block 30 is cooled to room temperature, it is cut according to the shape of the rear sound cavity 11 and attached to the rear housing 10 for use. It is calculated that the mass of the sound-absorbing particles 32 in the sheet sound-absorbing block 30 used for the rear sound cavity 11 is 120 mg.

[0097] Example 2

[0098] First, prepare the sound-absorbing block 30. The specific preparation steps are as follows:

[0099] (1) Lay the PET non-woven fabric of 30 g / m 2 flat in the tooling. Uniformly lay the ZSM-5 molecular sieve with an average particle size of about 2 μm on the PET non-woven fabric, and then lay the PET non-woven fabric of 4 g / m 2 on the molecular sieve. Repeat the above steps so that the non-woven fabric and the molecular sieve are arranged alternately, with a total of five layers (specifically, PET non-woven fabric + molecular sieve + PET non-woven fabric + sieve + PET non-woven fabric), to obtain the pretreated sound-absorbing block 30. That is, for the organic fiber layer on the outermost side of the sound-absorbing block 30, PET non-woven fabric of 30 g / m 2 is selected, and for the middle organic fiber layer, PET non-woven fabric of 4 g / m 2 is selected. The material of the porous raw powder 321 is ZSM-5 molecular sieve. Moreover, the mass ratio of the organic fiber 31 in the sound-absorbing block 30 is 25%, and the mass ratio of the porous raw powder 321 in the sound-absorbing block 30 is 75%.

[0100] (2) Cover a tooling board on the pre-treated sound-absorbing block 30 obtained in step (1), and place the tooling board together with the pre-treated sound-absorbing block 30 in an oven at 160 °C for 0.5 h. During the heat treatment process, the organic fibers 31 in the PET non-woven fabric will soften and melt to adhere to the molecular sieve, obtaining the heat-treated sound-absorbing block 30;

[0101] (3) Cool the heat-treated sound-absorbing block 30 to room temperature. The prepared sound-absorbing block 30 in the embodiment has a three-dimensional network structure.

[0102] Then, apply the prepared sound-absorbing block 30 in the embodiment to the speaker module. Specifically, cut and attach it inside the housing 10 according to the shape of the rear sound cavity 11 for use. And, it is calculated that the mass of the porous raw powder 321 in the sound-absorbing block 30 of the sheet material used for the rear sound cavity 11 is 180 mg.

[0103] Comparative Example 1

[0104] In Comparative Example 1, 120 mg of conventional sound-absorbing particles are installed in the rear sound cavity of the speaker module of the same model as in Example 1, which are specifically made of the same ZSM-5 molecular sieve and water-soluble acrylate adhesive as in Example 1.

[0105] Comparative Example 2

[0106] In the rear sound cavity of the speaker module of the same model as in Example 2, 189 mg of conventional sound-absorbing particles are installed. The sound-absorbing particles are bonded and formed with the same ZSM-5 molecular sieve and binder as in Example 2. The mass of the ZSM-5 molecular sieve contained in the sound-absorbing particles is 180 mg, and the binder is a water-soluble acrylate adhesive. It can be understood that in the comparative example, the same material and the same weight of molecular sieve as in the sound-absorbing block 30 of the example are taken and filled in the rear sound cavity of the speaker module of the same model, and the PET is encapsulated to make a complete speaker module product.

[0107] The model specifications of the speaker modules assembled in Example 1 and Comparative Example 1 are exactly the same, and the model specifications of the speaker modules assembled in Example 2 and Comparative Example 2 are exactly the same. The following reliability front and rear acoustic tests are carried out on the above examples and comparative examples respectively:

[0108] Reliability conditions: In an environment of 65 °C and 95% RH, with a 3.5 V voltage pink noise signal, continuously powered on for 120 h.

[0109] Among them, the IMP curves before the reliability experiment are as Figure 4 and Figure 6 shown, and the IMP curves after the reliability experiment are as Figure 5 and Figure 7As shown. In addition, after the reliability test, the F0 of the speaker module was tested, and each group of speaker modules was disassembled to observe the damage condition of the sound absorption block 30, as shown in Table 1.

[0110] Table 1

[0111]

[0112] From Figure 4 the IMP curve of, it can be seen that the F0 of the sound absorption block 30 in Example 1 is close to the F0 of the sound absorption block in Comparative Example 1, indicating that during the preparation process of the sound absorption block 30 in Example 1, when the organic fiber 31 melted and bonded the sound absorption particles 32, not too many pores were lost. Instead, there are a large number of macropores in the three-dimensional framework structure, which is beneficial to the air flow in and out of the sound absorption block 30.

[0113] From Figure 5 the IMP curve of, it can be seen that the change in F0 of Example 1 is extremely small, while the change in F0 of Comparative Example 1 is relatively large. Combining with the powder shedding situation in Table 1, it can be known that the sound absorption particles in Comparative Example 1 are fragmented and the powder shedding is serious, which indicates that the sound absorption block 30 in Example 1 is an integral adhered to the outer shell 10, avoiding the flow between the sound absorption particles 32 and improving the durability of the sound absorption block 30; while in Comparative Example 1, the sound absorption particles can freely flow, collide and rub against each other, resulting in the fragmentation and powder shedding of the sound absorption particles.

[0114] From Figure 6 the IMP curve of, it can be seen that the F0 of the sound absorption block 30 in Example 2 is close to the F0 of Comparative Example 2, which indicates that during the preparation process of the sound absorption block 30 in Example 2, when the organic fiber 31 melted and bonded the molecular sieve, not too many pores were lost. Instead, there are a large number of pores in the three-dimensional network structure formed by the organic fiber 31, which is beneficial to the air flow in and out of the sound absorption block 30.

[0115] From Figure 7 the IMP curve of, it can be seen that the change in F0 of Example 2 is extremely small, while the change in F0 of Comparative Example 2 is relatively large. Combining with the powder shedding situation in Table 1, it can be known that the sound absorption raw powder in Comparative Example 2 is fragmented and the powder shedding is very serious, which indicates that the sound absorption block 30 sheet in Example 2 is an integral structure adhered to the outer shell 10, and it is not easy for the powder between the porous raw powders 321 to flow. This not only improves the durability of the sound absorption block 30, but also avoids the porous raw powder 321 falling off the sound absorption block 30 and entering the inside of the speaker module, thus affecting the acoustic performance. In contrast, the sound absorption particles in the comparative example can freely flow and collide and rub against each other, which is easy to cause the fragmentation and powder shedding of the sound absorption particles.

[0116] In summary, the sound-absorbing block 30 according to the embodiment of the present utility model has a three-dimensional frame structure, which is formed by connecting adjacent organic fibers 31 and between the organic fibers 31 and the sound-absorbing material through an adhesion layer. The sound-absorbing material includes porous raw powder 321 and / or sound-absorbing particles 32. The average particle size of the porous raw powder 321 used is 0.1 μm - 30 μm, which can ensure that the porous raw powder 321 is easy to prepare and has a good sound-absorbing effect. Moreover, the particle size of the sound-absorbing particles 32 is 50 μm - 800 μm. The particle size range of the sound-absorbing particles 32 is wide, greatly improving the use efficiency of the sound-absorbing particles 32 and reducing the cost. In addition, it can prevent the sound-absorbing material from falling off the sound-absorbing block 30, and can avoid the sound-absorbing material from colliding and pulverizing into the interior of the sound generating module 100 when the sound generating module 100 operates at a large amplitude, thereby affecting the acoustic performance.

[0117] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. A sound absorbing block, characterized in that: include: A three-dimensional frame structure, wherein the three-dimensional frame structure comprises a plurality of sound-absorbing materials and organic fibers, wherein the organic fibers are softened by heat to form an adhesion layer on the surface thereof, and adjacent organic fibers and the organic fibers and the sound-absorbing materials are connected via the adhesion layer to form the three-dimensional frame structure. The sound-absorbing material includes porous raw powder and / or sound-absorbing particles, each of the sound-absorbing particles includes a plurality of porous raw powders and an adhesive for bonding the plurality of porous raw powders into one; The average particle size of the porous raw powder is 0.1 μm-30 μm, and the particle size of the sound-absorbing particles is 50 μm-800 μm.

2. The sound absorbing block according to claim 1, characterized in that: The three-dimensional frame structure has a three-dimensional network structure, wherein part of the sound absorbing material is bonded to the outer surface of the three-dimensional frame structure, and part of the sound absorbing material is located inside the three-dimensional frame structure.

3. The sound absorbing block according to claim 1, characterized in that: The porous raw powder includes one of activated carbon, zeolite powder, silicon dioxide, porous alumina, molecular sieve, metal organic framework material, aerogel and COF.

4. The sound absorbing block according to claim 1, characterized in that: The sound-absorbing block has a plurality of primary channels and secondary channels, wherein each of the porous raw powders has the primary channels respectively, and the secondary channels are formed at least one between the plurality of porous raw powders, between the sound-absorbing particles and the organic fibers, and between the organic fibers.

5. The sound absorbing block according to claim 1, characterized in that: The organic fiber is one of fiber woven fabric, non-woven fabric and hot-melt web; Or, the organic fiber includes one of polyamide fiber, polyester fiber, polyurethane fiber, polyolefin fiber, polyvinyl acetal fiber, polyacrylonitrile fiber, polylactic acid fiber, polyetheretherketone fiber and polyphenylene sulfide fiber.

6. The sound absorbing block according to claim 1, characterized in that: The mass ratio of the organic fibers to the sound absorbing block is 2%-60%.

7. The sound absorbing block according to claim 1, characterized in that: The softening point of the organic fiber is greater than or equal to 80°C.

8. The sound absorbing block according to claim 1, characterized in that: The total pore volume of the sound absorbing block is greater than 0.1 mL / g.

9. A sound module, characterized in that: The invention comprises a sound-emitting unit, a shell, and an internal cavity surrounded by the shell and the sound-emitting unit, wherein the internal cavity is filled with a sound-absorbing block according to any one of claims 1 to 8.

10. An electronic device, characterized in that: Including the sound module described in claim 9.

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