Sound absorption assembly, sound production device and electronic equipment

Abstract

This invention discloses a sound-absorbing component, a sound-generating device, and an electronic device, relating to the field of acoustics. The sound-absorbing component includes a housing and molecular sieve powder filled within the housing. The housing includes a main body and a capping part. The main body defines an accommodating space, and the molecular sieve powder is filled within the accommodating space. The capping part covers the main body to seal the accommodating space. At least a portion of the main body is formed as a sound-absorbing structure. The sound absorption coefficient of the main body is >0.25, the average particle size of the molecular sieve powder is greater than 10 μm, and the bulk density of the molecular sieve powder is 0.45-0.8 g / ml. In this invention, the molecular sieve powder in the sound-absorbing component does not require adhesive bonding, thereby eliminating the impact of adhesive blockage on the molecular sieve channels and improving sound absorption performance. This results in better acoustic improvement performance. Furthermore, because the sound absorption coefficient of the main body is greater than 0.25, the main body has a certain sound absorption effect, thus enhancing the sound absorption capacity and overall sound absorption effect of the sound-absorbing component.

Description

Technical Field

[0001] This invention relates to the field of acoustics, and more particularly to a sound-absorbing component, a sound-generating device, and an electronic device. Background Technology

[0002] In recent years, with the increasing trend towards thinner and lighter electronic products, the space available for speakers is becoming increasingly smaller. As miniature speaker modules become flatter, the volume of the acoustic rear cavity shrinks. To address the reduced low-frequency performance caused by this space reduction, sound-absorbing particles made of porous materials can be filled into the rear acoustic cavity. Utilizing the unique physical channel structure within the porous material, the rapid adsorption-desorption properties of the gas in the rear cavity are utilized to virtually enlarge the resonant space of the speaker's acoustic rear cavity, thereby effectively reducing the speaker's resonant frequency F0 and improving low-frequency sensitivity.

[0003] Currently, the average particle size of the sound-absorbing particles filling the rear cavity of loudspeakers is 300-400μm, and the volume of these particles accounts for up to 80% of the total volume of the rear cavity. Moreover, these sound-absorbing particles have gaps when they are piled up, which cannot effectively fill the rear cavity volume, resulting in a reduction in acoustic improvement. In the production of sound-absorbing particles, adhesives need to be added to shape the particles. The adhesives can block some of the pores of the molecular sieve powder, causing further loss of acoustic performance. Furthermore, the sound-absorbing particles are prone to breakage when they move and collide in the rear cavity, leading to powder contamination of the sound-generating unit. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-absorbing component, a sound-generating device, and an electronic device, aiming to solve the technical problem that the sound-absorbing particles filled in the rear cavity of existing loudspeakers are easily broken, resulting in minimal improvement in the low-frequency performance of the loudspeakers.

[0005] To achieve the above objectives, the present invention provides a sound-absorbing component, comprising a housing and molecular sieve powder filled within the housing. The housing includes a main body and a capping portion. The main body defines an accommodating space, the molecular sieve powder is filled within the accommodating space, and the capping portion covers the main body to seal the accommodating space. At least a portion of the main body is formed as a sound-absorbing structure, the sound absorption coefficient of the main body is >0.25, the average particle size of the molecular sieve powder is greater than 10 μm, and the bulk density of the molecular sieve powder is 0.45-0.8 g / ml.

[0006] In one embodiment, the main body is formed as a porous structure composed of stacked fibers, the fibers including at least one of chemical fibers, modified chemical fibers, and natural fibers.

[0007] In one embodiment, the diameter of the fiber filament is 0.05-10 μm;

[0008] And / or, the melting point of the fiber is greater than 100°C.

[0009] In one embodiment, the air permeability of the main body is 150-1000 mm / s.

[0010] In one embodiment, the areal density of the main body is 20-600 g / m³. 2 .

[0011] In one embodiment, the thickness of the main body is 0.08-4.5 mm;

[0012] And / or, the silica-to-alumina ratio of the molecular sieve powder is less than 200.

[0013] In one embodiment, the volume of the molecular sieve powder occupies more than 55% of the volume of the accommodating space.

[0014] In one embodiment, the cover is a breathable structure, a sound-absorbing structure, or a sealed structure.

[0015] In one embodiment, the main body and the cover are connected by heat fusion or adhesive bonding.

[0016] The present invention also provides a sound-generating device, including a sound-generating unit, a housing, and an internal cavity surrounded by the housing and the sound-generating unit, wherein the internal cavity is filled with a sound-absorbing component as described above.

[0017] In one embodiment, the housing includes a first housing and a second housing disposed opposite to each other, and the sound-absorbing component is sandwiched between the first housing and the second housing;

[0018] Alternatively, an adhesive layer may be provided on the inner wall of the outer casing, and the adhesive layer may be bonded to the sound-absorbing component.

[0019] The present invention also provides an electronic device, including the sound-generating device as described above.

[0020] This invention provides a sound-absorbing component, a sound-generating device, and an electronic device. The sound-absorbing component includes a housing and molecular sieve powder filled within the housing. The housing includes a main body and a capping part. The main body defines an accommodating space, and the molecular sieve powder is filled within the accommodating space. The capping part covers the main body to seal the accommodating space. At least a portion of the main body is formed as a sound-absorbing structure. The sound absorption coefficient of the main body is >0.25. The average particle size of the molecular sieve powder is greater than 10 μm, and the bulk density of the molecular sieve powder is 0.45-0.8 g / ml. At least a portion of the main body is formed as a sound-absorbing structure, with a sound absorption coefficient >0.25. Therefore, while the molecular sieve powder plays a sound-absorbing role, the main body can also assist in improving the sound absorption performance. Furthermore, the main body can also accommodate the molecular sieve powder, intercepting its diffusion into the rear acoustic cavity and solving the problem of powder leakage and contamination. The average particle size of the molecular sieve powder is greater than 10μm, and its bulk density is 0.45-0.8g / ml, which is larger than that of common molecular sieve powder materials. The larger bulk density also results in a more compact internal structure, containing more pore structure units per unit volume. Moreover, unlike sound-absorbing particles, molecular sieve powder does not require adhesive bonding, thus solving the problem of adhesive clogging of molecular sieve channels in sound-absorbing particles, resulting in better acoustic improvement performance. In addition, since the sound absorption coefficient of the main body is greater than 0.25, the main body has a certain sound absorption effect, thereby improving the sound absorption capacity of the sound-absorbing component, enhancing the sound absorption effect, and effectively improving the low-frequency acoustic performance of the sound-generating device. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or related technologies of this drawing, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of an embodiment of the sound-absorbing component involved in the present invention;

[0023] Figure 2 This is a cross-sectional view of another embodiment of the sound-absorbing component of the present invention, which employs adhesive bonding.

[0024] Figure 3 This is a cross-sectional view of an embodiment of the sound-generating device involved in the present invention;

[0025] Figure 4 This is a cross-sectional view of another embodiment of the sound-generating device involved in the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Sound-generating device; 110. Sound-generating unit;

[0028] 120. Outer shell; 121. First shell; 122. Second shell;

[0029] 130. Sound-absorbing component; 131. Housing; 131a. Main body; 131b. Sealing part; 132. Molecular sieve powder; 133. Adhesive layer;

[0030] 140. Rear vocal cavity.

[0031] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides a sound-absorbing component 130. Figure 1 This is a cross-sectional view of a sound-absorbing component according to an embodiment of the present invention, with reference to... Figure 1 The sound-absorbing component 130 includes a housing 131 and molecular sieve powder 132 filled in the housing 131. The housing 131 includes a main body 131a and a capping part 131b. The main body 131a defines an accommodating space, and the molecular sieve powder 132 is filled in the accommodating space. The capping part 131b covers the main body 131a to seal the accommodating space. At least a portion of the main body 131a is formed as a sound-absorbing structure. The sound absorption coefficient of the main body 131a is >0.25, the average particle size of the molecular sieve powder 132 is greater than 10μm, and the bulk density of the molecular sieve powder 132 is 0.45-0.8g / ml.

[0034] In this embodiment, the molecular sieve powder 132 is confined within the shell 131, preventing its diffusion outside the containment space. At least a portion of the main body 131a is formed as a sound-absorbing structure, possessing sound-absorbing functionality. The sound-absorbing structure may include a porous sound-absorbing structure, a resonant sound-absorbing structure, and a special sound-absorbing structure. The porous sound-absorbing structure absorbs sound energy through the friction between sound waves and the material surface. The resonant sound-absorbing structure absorbs sound energy through resonance. The special sound-absorbing structure is suitable for specific sound-absorbing requirements. The sound absorption coefficient of the main body 131a is >0.25, for example, 0.28, 0.3, 0.33, 0.35, 0.4, 0.45, 0.5, etc. It is understood that the sound absorption coefficient characterizes the material's ability to absorb sound energy; the larger the sound absorption coefficient of the main body 131a, the stronger its sound absorption ability, which can reduce sound wave reflection and resonance. The sound absorption coefficient of the main body 131a is greater than 0.25, which means it has the function of improving the resonant frequency of the sound generating device 100. Therefore, based on the sound absorption effect of the molecular sieve powder 132, the overall sound absorption effect of the sound absorption component 130 can be improved, which is conducive to further improving the low-frequency performance of the sound generating device 100.

[0035] In some feasible embodiments, the main body 131a is formed as a porous structure composed of stacked fiber filaments, including at least one of chemical fibers, modified chemical fibers, and natural fibers. Specifically, usable chemical fibers include polypropylene fibers, viscose fibers, polyamide fibers, polyester fibers, polyacrylonitrile fibers, etc. Modified chemical fibers can be prepared by modifying the aforementioned chemical fibers such as polypropylene fibers, viscose fibers, polyamide fibers, polyester fibers, and polyacrylonitrile fibers. Natural fibers include cotton, linen, wool, silk, etc. This embodiment can use a wide variety of fiber types from diverse sources, allowing selection of one type of fiber filament or mixing of two or more types based on actual product performance requirements.

[0036] In some feasible embodiments, the fiber diameter is 0.05-10 μm, for example, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 3 μm, 5 μm, 7 μm, 10 μm, etc. The smaller the fiber diameter, the thinner the resulting main body 131a can be, resulting in better air permeability. Conversely, when the fiber diameter exceeds 10 μm, the resulting pore size is larger, leading to higher air permeability and making it less likely to trap molecular sieve powder 132. In this embodiment, the minimum fiber diameter can reach 0.05 μm, resulting in a membrane material with excellent thickness and air permeability for fabricating the main body 131a.

[0037] In some feasible embodiments, the melting point of the fiber filament is greater than 100°C, for example, 102°C, 103°C, 105°C, 110°C, etc. It is understood that the temperature of the rear cavity of the sound-generating device 100 can reach 100°C. Selecting a fiber filament with a melting point greater than 100°C can prevent the main body 131a from melting. If the fiber filament melts, parameters such as the pore structure and air permeability of the main body 131a will be affected, leading to an impact on acoustic performance. Therefore, selecting a fiber filament with a melting point greater than 100°C helps the sound-absorbing component 130 maintain its acoustic performance in high-temperature operating environments.

[0038] In some feasible embodiments, the air permeability of the main body 131a is 150-1000 mm / s, for example, 150 mm / s, 200 mm / s, 300 mm / s, 400 mm / s, 500 mm / s, 600 mm / s, 700 mm / s, 800 mm / s, 900 mm / s, 1000 mm / s, etc. If the air permeability is too low, the efficiency of the gas passing through the main body 131a in the rear cavity decreases, affecting the adsorption and desorption speed of the internal molecular sieve powder 132, and thus affecting the sound absorption effect. If the air permeability is too high, it indicates that the pore size in the main body 131a is too large or the pore structure is too sparse, which can easily affect the interception of the molecular sieve powder 132 and cause powder leakage. Controlling the air permeability of the main body 131a within a suitable range can both intercept the molecular sieve powder 132 and provide certain acoustic performance through its own packed pore structure.

[0039] In some feasible embodiments, the areal density of the main body 131a is 20-600 g / m³. 2 For example, 20g / m 2 50g / m 2 100g / m 2 150g / m 2 200g / m 2 250g / m 2 300g / m 2 350g / m 2 400g / m 2 450g / m 2 500g / m 2 550g / m 2 600g / m 2It is understandable that if the areal density of the main body 131a is too low, its porous structure will be sparse and unable to effectively intercept the molecular sieve powder 132. Conversely, if the areal density is too high, the structure will be too dense, affecting airflow and the air adsorption / desorption function of the internal molecular sieve powder 132, and also occupying too much space in the rear cavity. Controlling the areal density of the main body 131a within a suitable range can effectively intercept the molecular sieve powder 132 and avoid adversely affecting its gas adsorption / desorption function. The areal density of the main body 131a can be further controlled between 35-100 g / m³. 2 Within a certain range, a main body 131a structure is obtained that can effectively intercept molecular sieve powder 132 and has good acoustic performance.

[0040] In some feasible embodiments, the thickness of the main body 131a is 0.08-4.5 mm, for example, 0.08 mm, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc. It is understood that if the thickness of the main body 131a is too thin, the porous structure composed of fiber filaments will be loose and unable to effectively intercept the molecular sieve powder 132; if the thickness is too thick, it will affect the airflow in and out of the main body 131a, affecting the air adsorption-desorption function of the internal molecular sieve powder 132, and occupying too much space in the rear cavity. Controlling the thickness of the main body 131a within the range of 0.08-4.5 mm can effectively intercept the molecular sieve powder 132 while maintaining smooth airflow in and out of the rear cavity. The thickness of the main body 131a can be further controlled within the range of 0.1-1 mm to obtain optimal air permeability.

[0041] In this embodiment, the molecular sieve powder 132 has an average particle size greater than 10 μm, for example, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc. It is understood that the molecular sieve powder 132 has many uniformly sized channels and pores; these porous structural units have air adsorption and desorption effects, resulting in good sound absorption performance. The average particle size of the molecular sieve powder 132 affects the number of porous structural units per unit volume. Common molecular sieve powder materials typically have a particle size of 1-2 μm, resulting in fewer porous structural units per unit volume and poorer acoustic performance. In this embodiment, the molecular sieve powder 132, tested with a laser particle size analyzer, has a D50 greater than or equal to 10 μm. The internal structure of the molecular sieve powder 132 is densely arranged, allowing for more porous structural units per unit volume, resulting in better acoustic performance. Furthermore, the molecular sieve powder 132 with a particle size greater than or equal to 10 μm is less prone to dust generation, reducing harm to the human respiratory system during operation.

[0042] In this embodiment, the bulk density of the molecular sieve powder 132 is 0.45-0.8 g / ml, for example, 0.45 g / ml, 0.5 g / ml, 0.6 g / ml, 0.7 g / ml, 0.75 g / ml, 0.8 g / ml, etc. It can be understood that the bulk density of the molecular sieve powder 132 refers to the mass of molecular sieve powder 132 per unit volume when the container is just filled with the powder freely; it reflects the tightness between the molecular sieve powder particles. The bulk density affects the performance and application range of the molecular sieve powder 132. In this embodiment, the lower the bulk density of the molecular sieve powder 132, the looser the particles, the larger the gap space within the shell 131, the fewer the pore structure units per unit volume, and the worse the acoustic performance. Furthermore, there are limitations to increasing the bulk density. Different types of molecular sieve powder 132 have different bulk densities, mainly depending on factors such as particle size, specific surface area, porosity, and mechanical strength. In this embodiment, the molecular sieve powder 132 has a bulk density in the range of 0.45-0.8 g / ml, exhibiting high mechanical strength and a compact internal structure, thus possessing a high bulk density. Therefore, within the same volume, more porous structural units can be incorporated to improve acoustic performance.

[0043] In some feasible embodiments, the silicon-to-aluminum ratio of the molecular sieve powder 132 is less than 200, for example, 80, 100, 130, 150, 180, etc. It is understood that the higher the silicon-to-aluminum ratio of the molecular sieve powder 132, the higher the requirements for raw materials and the greater the manufacturing difficulty. In this embodiment, the silicon-to-aluminum ratio of the molecular sieve powder 132 is less than 200. While maintaining the ability to adsorb and desorb molecules in the air, the requirements for the raw materials used to synthesize the molecular sieve powder 132 are reduced, the manufacturing cost is lowered, and it is easier to synthesize crystals with an average particle size greater than 10 μm.

[0044] In some feasible implementations, the volume of molecular sieve powder 132 occupies more than 55% of the volume of the accommodating space, for example, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc. It is understood that the housing 131 needs to occupy a certain volume in the rear cavity, and the molecular sieve powder 132 is located within the accommodating space of the housing 131. If the volume of molecular sieve powder 132 occupies less than 55% of the accommodating space, the entire sound-absorbing assembly 130 occupies a certain volume but cannot provide an effective acoustic improvement effect. Therefore, the volume of molecular sieve powder 132 occupies more than 55% of the accommodating space. While occupying a certain volume, this allows for a greater quantity of molecular sieve powder 132, resulting in a greater number of pores in the molecular sieve powder 132, which is more conducive to the adsorption and desorption of gas in the rear cavity, providing a better acoustic improvement effect.

[0045] In some feasible embodiments, the cover portion 131b is a breathable structure, a sound-absorbing structure, or a sealed structure. A breathable structure allows air molecules to pass through, and the cover portion 131b with a breathable structure can also possess certain acoustic properties. A sound-absorbing cover portion 131b can use the same material as the main body portion 131a. A sealed cover portion 131b primarily serves to seal the containing space.

[0046] In some feasible embodiments, the main body 131a and the cap 131b are connected by heat fusion sealing or adhesive bonding. It is understood that the connection method between the main body 131a and the cap 131b can be selected based on their materials. For example, if the main body 131a and the cap 131b are made of the same material, heat fusion sealing is used; if the main body 131a and the cap 131b are made of different materials, and the adhesion between the two materials is insufficient, adhesive bonding is used. Figure 2 This is a cross-sectional view of the sound-absorbing component 130, which is connected by adhesive bonding, as shown below. Figure 2 As shown, the sound-absorbing component 130 includes a housing 131 and molecular sieve powder 132 filled in the housing 131. The housing 131 includes a main body 131a and a cover 131b. An adhesive layer 133 is provided between the main body 131a and the cover 131b to connect the main body 131a and the cover 131b.

[0047] In this embodiment, at least a portion of the main body 131a is formed as a sound-absorbing structure. The sound absorption coefficient of the main body 131a is >0.25. Therefore, while the molecular sieve powder 132 plays a sound-absorbing role, the main body 131a can also help improve the sound absorption performance. The main body 131a can also accommodate the molecular sieve powder 132, intercept the diffusion of the molecular sieve powder 132 into the rear acoustic cavity, and solve the problem of powder leakage and contamination. The average particle size of the molecular sieve powder 132 is greater than 10 μm, and the bulk density is 0.45-0.8 g / ml, which is larger than the particle size of common molecular sieve powder 132 materials. The larger bulk density also makes the internal structure of the molecular sieve powder 132 more compact, and can contain more porous structural units in a unit volume. Moreover, the molecular sieve powder 132 does not need to be bonded with an adhesive to form sound-absorbing particles, thereby solving the problem of adhesive occupying filling space in sound-absorbing particles and increasing the volume of effective sound-absorbing material in the sound-absorbing component 130. Therefore, it has good acoustic improvement performance. Furthermore, since the sound absorption coefficient of the main body 131a is greater than 0.25, the main body 131a has a certain sound absorption effect, which can improve the sound absorption capacity of the sound absorption component 130, improve the sound absorption effect, and thus effectively improve the low-frequency acoustic performance of the sound generating device 100.

[0048] This invention also provides a sound-generating device 100, see reference. Figure 3The sound-generating device 100 includes a sound-generating unit 110, a housing 120, and an internal cavity enclosed by the housing 120 and the sound-generating unit 110. The internal cavity is filled with the sound-absorbing component 130 as described above. The sound-generating unit 110 divides the housing 120 into a front acoustic cavity and a rear acoustic cavity 140, and the sound-absorbing component 130 can be filled in the rear acoustic cavity 140.

[0049] Optionally, refer to Figure 4 The outer casing 120 includes a first housing 121 and a second housing 122 disposed opposite to each other, with the sound-absorbing component 130 sandwiched between the first housing 121 and the second housing 122; or, an adhesive layer is provided on the inner wall of the outer casing 120, and the adhesive layer is bonded to the sound-absorbing component 130. Through the spatial limiting effect of the first housing 121 and the second housing 122, the sound-absorbing component 130 is confined within the cavity of the rear acoustic chamber 140 of the sound-generating device 100. Alternatively, the sound-absorbing component 130 can be attached to the inner wall of at least one side of the rear acoustic chamber 140 using an adhesive layer such as double-sided tape.

[0050] The sound-generating device 100 provided by this invention solves the technical problem that sound-absorbing particles are easily broken, leading to contamination of the sound-generating unit 110. Compared with the prior art, the beneficial effects of the sound-generating device 100 provided by the embodiments of this invention can be referred to the beneficial effects of the sound-absorbing component 130 in the above embodiments, and will not be repeated here.

[0051] This invention also provides an electronic device, which includes the sound-generating device 100 as described in the above embodiments.

[0052] In this embodiment, the electronic devices include mobile phones, laptops, tablets, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) earphones, smart speakers, smart wearable devices, etc.

[0053] Compared with the prior art, the beneficial effects of the electronic device provided in the embodiments of the present invention are the same as those of the sound-generating device 100 in the above embodiments, and will not be repeated here.

[0054] The sound-absorbing component of the present invention is described in detail below with specific embodiments and comparative examples. It is important to understand that the following description is merely exemplary and not intended to limit the scope of the invention. Furthermore, the comparative examples were chosen to demonstrate the technical advancements of the present invention, and not all technical solutions in the comparative examples are conventional technologies in this field.

[0055] Example 1

[0056] Both the main body 131a and the capping part 131b are made of a porous membrane material composed of stacked polypropylene fiber filaments. The membrane material has a sound absorption coefficient of 0.38, a thickness of 0.13 mm, and an air permeability of 300 mm / s. ZSM-5 molecular sieve powder with an average particle size of 15 μm, a silica-to-alumina ratio of 130, and a bulk density of 0.6 g / ml is selected.

[0057] The preparation process of the sound-absorbing component 130 is as follows:

[0058] 1. Place the membrane material into a covering fixture made according to the shape of the rear cavity space. The internal volume of the fixture is 0.26ml. Then close the upper and lower molds.

[0059] 2. Place the tooling on the heating table of the vulcanizing machine, set the heating temperature to 130℃, the pressure to 0.1MPa, and maintain the temperature and pressure for 60 seconds.

[0060] 3. After hot pressing, remove the cooled tooling and open the mold to obtain the spatially shaped main body 131a.

[0061] 4. Fill the accommodating space of the main body 131a obtained by stamping with ZSM-5 molecular sieve powder until the accommodating space of the main body 131a is 100% filled by volume.

[0062] 5. Place the flat membrane material on the upper surface of the main body 131a filled with ZSM-5 molecular sieve powder, and then perform a second hot pressing with a flat mold at a temperature of 150℃ and a pressure of 0.1MPa for 60 seconds.

[0063] 6. After the second hot pressing is completed, the mold is opened and the packaged shell 131 is taken out to obtain the sound-absorbing component 130 containing ZSM-5 molecular sieve powder as sound-absorbing material.

[0064] 7. The sound-absorbing component 130 with a volume of 0.26 ml is filled into the speaker with a rear cavity volume of 0.35 ml, and the assembly is completed to obtain the whole speaker.

[0065] Comparative Example 1

[0066] Using a 0.26ml funnel measuring cup, take 0.26ml of ZSM-5 molecular sieve sound-absorbing particles with a particle size of 300-400μm (particles formed by bonding multiple ZSM-5 molecular sieve powders together with adhesive), fill it into a speaker with a rear cavity volume of 0.35ml, seal the filling port with PET, and assemble the entire speaker.

[0067] Comparative Example 2

[0068] Both the main body 131a and the cover 131b are made of a porous membrane material composed of stacked polypropylene fiber filaments. The membrane material has a sound absorption coefficient of 0.38, a thickness of 0.13 mm, and an air permeability of 300 mm / s.

[0069] The preparation process of the sound-absorbing component 130 is as follows:

[0070] 1. Place the membrane material into a covering fixture made according to the shape of the rear cavity space. The internal volume of the fixture is 0.26ml. Then close the upper and lower molds.

[0071] 2. Place the tooling on the heating table of the vulcanizing machine, set the heating temperature to 130℃, the pressure to 0.1MPa, and maintain the temperature and pressure for 60 seconds.

[0072] 3. After hot pressing, remove the cooled tooling and open the mold to obtain the spatially shaped main body 131a.

[0073] 4. Place the flat membrane material on the upper surface of the main body 131a, and then perform a second hot pressing using a flat mold at a temperature of 150℃ and a pressure of 0.1MPa for 60 seconds.

[0074] 5. After the second hot pressing is completed, the mold is opened and the encapsulated shell 131 is removed to obtain the sound-absorbing component 130.

[0075] 6. The sound-absorbing component 130 with a volume of 0.26 ml is filled into the speaker with a rear cavity volume of 0.35 ml, and the assembly is completed to obtain the whole speaker.

[0076] Comparative Example 3

[0077] Both the main body 131a and the capping part 131b are made of a porous membrane material composed of stacked polypropylene fiber filaments. The membrane material has a sound absorption coefficient of 0.38, a thickness of 0.13 mm, and an air permeability of 300 mm / s. ZSM-5 molecular sieve sound-absorbing particles (particles formed by bonding multiple ZSM-5 molecular sieve powders together with an adhesive) are selected, with a particle size of 300-400 μm, a silica-alumina ratio of 130, and a bulk density of 0.39 g / ml.

[0078] The preparation process of the sound-absorbing component 130 is as follows:

[0079] 1. Place the membrane material into a covering fixture made according to the shape of the rear cavity space. The internal volume of the fixture is 0.26ml. Then close the upper and lower molds.

[0080] 2. Place the tooling on the heating table of the vulcanizing machine, set the heating temperature to 130℃, the pressure to 0.1MPa, and maintain the temperature and pressure for 60 seconds.

[0081] 3. After hot pressing, remove the cooled tooling and open the mold to obtain the spatially shaped main body 131a.

[0082] 4. Fill the accommodating space of the main body 131a obtained by stamping with ZSM-5 molecular sieve sound-absorbing particles until the accommodating space of the main body 131a is 100% filled.

[0083] 5. Place the flat membrane material on the upper surface of the main body 131a filled with ZSM-5 molecular sieve sound-absorbing particles, and then perform a second hot pressing with a flat mold at a temperature of 150℃ and a pressure of 0.1MPa for 60 seconds.

[0084] 6. After the second hot pressing is completed, the mold is opened and the packaged shell 131 is taken out to obtain the sound-absorbing component 130 containing ZSM-5 molecular sieve sound-absorbing particles as sound-absorbing material.

[0085] 7. The sound-absorbing component 130 with a volume of 0.26 ml is filled into the speaker with a rear cavity volume of 0.35 ml, and the assembly is completed to obtain the whole speaker.

[0086] It should be noted that the loudspeakers used in Example 1 and Comparative Examples 1-3 are all of the same model. Experimental tests were conducted on the loudspeakers assembled in Example 1 and Comparative Examples 1-3.

[0087] Acoustic performance evaluation: The loudspeakers assembled in Example 1 and Comparative Examples 1-3 were subjected to IMP (Impedance) tests. The resonant frequency F0 of each loudspeaker was measured and the results are shown in Table 1 below.

[0088] Table 1

[0089]

[0090] As can be seen from the results in Table 1, compared with Comparative Example 1, the resonant frequency F0 of the speaker in Example 1 is about 18Hz lower than that in Comparative Example 1. This indicates that the acoustic performance improvement effect of Example 1 is stronger than that of Comparative Example 1, and it can better reduce the resonant frequency of the speaker, resulting in better bass sound quality. The variables between Example 1 and Comparative Example 1 include whether the housing 131 is used and the form of sound-absorbing material. Both of these factors can affect the reduction effect of the resonant frequency. Further analysis shows that when the sound-absorbing component 130 of Comparative Example 2 only has housing 131 material, the speaker resonant frequency can be reduced by 10Hz, indicating that housing 131 material itself also has certain acoustic improvement performance. Comparing Example 1 and Comparative Example 3, it can be found that the resonant frequency F0 of the speaker in Example 1 is 8Hz lower than that in Comparative Example 3. This indicates that when the housing 131 is 100% filled with the same volume, the form of filling with molecular sieve powder 132 with smaller particle size has a lower resonant frequency and better sound quality than the form of filling with large-particle sound-absorbing particles. This is because the average particle size of the particles in Comparative Example 3 is larger, and the particle accumulation will create a larger gap space than the powder filling method in Example 1, resulting in some space waste. In contrast, the gap space created by filling with molecular sieve powder 132 in Example 1 is smaller, which can increase the volume of effective sound-absorbing material in the sound-absorbing component 130, thus achieving a better effect in reducing the resonant frequency. Therefore, the sound-absorbing component 130 provided by the present invention has the advantages of smaller particle size of molecular sieve powder 132, which can effectively fill the rear cavity volume, and the addition of a housing 131 with acoustic improvement properties, thereby achieving a better effect in reducing the resonant frequency of the speaker.

[0091] Reliability test: The speakers of Example 1 and Comparative Example 1 were continuously powered on for 24 hours at -20℃ with a voltage of 2.2V and a BFPP signal. After the experiment, the resonant frequency F0 of each speaker group was measured, and the powder contamination of the rear cavity was observed after disassembly. The test results are shown in Table 2 below.

[0092] Table 2

[0093]

[0094] As can be seen from the results in Table 2, after the low-temperature BFPP test, the change in F0 of the speaker in Example 1 was relatively small, at 8Hz, while the change in F0 of Comparative Example 1 was larger, at 18Hz. After disassembling the products, the speaker in Example 1 showed no dust fragmentation, while the speaker in Comparative Example 1 showed dust fragmentation. This is because the membrane material used in the housing 131 of Example 1 has a suitable thickness and air permeability. While providing certain acoustic improvement performance, it can effectively intercept the filled molecular sieve powder 132 through the encapsulation effect of the housing 131. This indicates that the sound-absorbing component 130 of the present invention effectively avoids dust fragmentation of sound-absorbing particles and is more resistant to harsh reliability conditions.

[0095] Drop test: The speakers from Example 1 and Comparative Example 1 were assembled in a 200g drop fixture and dropped 400 times from a height of 1m. After the experiment, the products were disassembled, and the powder contamination in the rear cavity was observed. The test results are shown in Table 3 below.

[0096] Table 3

[0097] experimental group Disassembly of the product and analysis of powder contamination in the rear cavity. Example 1 none Comparative Example 1 There is powder contamination

[0098] As can be seen from the results in Table 3, the speaker in Example 1 had no broken particles, while the speaker in Comparative Example 1 had broken particles contaminating the sound-absorbing particles. This is because the membrane material used in the housing 131 of Example 1 has a suitable thickness and air permeability. While providing certain acoustic improvement performance, it can effectively intercept the filled molecular sieve powder 132 through the encapsulation effect of the housing 131. This shows that the sound-absorbing component 130 of the present invention effectively avoids the breakage of sound-absorbing particles and is more resistant to harsh reliability conditions.

[0099] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A sound-absorbing component, characterized in that, The invention comprises a shell and molecular sieve powder filled within the shell. The shell includes a main body and a capping portion. The main body defines a receiving space, the molecular sieve powder is filled within the receiving space, and the capping portion covers the main body to seal the receiving space. At least a portion of the main body is formed as a sound-absorbing structure, the sound absorption coefficient of the main body is >0.25, the average particle size of the molecular sieve powder is greater than 10 μm, and the bulk density of the molecular sieve powder is 0.45-0.8 g / ml. The air permeability of the main body is 150-1000 mm / s, and the areal density of the main body is 20-600 g / m³. 2 The thickness of the main body is 0.08-4.5 mm; the silicon-to-aluminum ratio of the molecular sieve powder is less than 200, and the volume of the molecular sieve powder accounts for more than 55% of the volume of the accommodating space; the main body is formed as a porous structure composed of stacked fiber filaments, the diameter of the fiber filaments is 0.05-10 μm, and the melting point of the fiber filaments is greater than 100 °C.

2. The sound-absorbing component as described in claim 1, characterized in that, The fiber filaments include at least one of chemical fibers, modified chemical fibers, and natural fibers.

3. The sound-absorbing component as described in claim 1, characterized in that, The cover can be a breathable structure, a sound-absorbing structure, or a sealed structure.

4. The sound-absorbing component as described in claim 1, characterized in that, The main body and the cover are connected by heat fusion or adhesive bonding.

5. A sound-generating device, characterized in that, It includes a sound-emitting unit, a housing, and an internal cavity enclosed by the housing and the sound-emitting unit, wherein the internal cavity is filled with a sound-absorbing component as described in any one of claims 1 to 4.

6. The sound-generating device as described in claim 5, characterized in that, The outer casing includes a first casing and a second casing disposed opposite to each other, and the sound-absorbing component is sandwiched between the first casing and the second casing; Alternatively, an adhesive layer may be provided on the inner wall of the outer casing, and the adhesive layer may be bonded to the sound-absorbing component.

7. An electronic device, characterized in that, Includes the sound-generating device as described in claim 5 or 6.

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