Sound absorption assembly, sound production device and electronic equipment

Abstract

The utility model discloses a sound-absorbing assembly, sound production device and electronic equipment, relates to acoustics field, sound-absorbing assembly includes shell and the sound-absorbing material that fills in the shell, wherein the shell includes the porous structure and has the sound-absorbing function, the sound absorption coefficient of shell is greater than 0.22, the sound-absorbing material includes the sound-absorbing particle and the sound-absorbing raw powder at least one of the sound-absorbing particle and the sound-absorbing raw powder, and the sound-absorbing particle is the porous structure. The sound-absorbing particles comprise a plurality of sound-absorbing raw powder and a binder for bonding the plurality of sound-absorbing raw powder into a whole. According to the sound absorption assembly, the sound absorption material is packaged in the shell, the problem that the sound absorption particles collide and are crushed to pollute the sound absorption particles can be solved, the sound absorption coefficient of the shell is larger than 0.22, the shell has a certain sound absorption effect, and therefore the overall sound absorption capacity of the sound absorption assembly can be improved.

Description

Technical Field

[0001] The utility model relates to the field of acoustics, in particular to a sound absorption component, a sound generating device and an electronic device. Background Technique

[0002] In recent years, under the general trend of the increasing thinning of electronic products, the space left for the speaker is getting smaller and smaller. With the flattening of the micro speaker module, the cavity volume of the acoustic rear cavity is reduced. In order to solve the problem of the reduction of the low-frequency performance of the speaker caused by the reduction of space, sound absorption particles made of porous materials can be filled into the rear sound cavity, and the rapid adsorption-desorption properties of the rear cavity gas are utilized by the special physical pore structure inside the porous materials to realize the virtual increase effect of the resonance space of the speaker acoustic rear cavity, thereby effectively reducing the resonance frequency F0 of the speaker and improving the low-frequency sensitivity.

[0003] In the existing speaker, the sound absorption particles are prone to collide and break during operation in the rear cavity, and there is a problem of powder contaminating the monomer. In the related art, it is proposed to use a plastic shell to encapsulate the particles, which can solve the problem of particle collision and breakage. However, when these particles are stacked in a limited space, an interstitial space is generated between the particles, and the rear cavity volume cannot be effectively filled, resulting in a reduction in the acoustic improvement effect. In addition, the plastic shell occupies a certain volume of the rear cavity, further affecting the low-frequency performance of the speaker. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a sound absorption component, a sound generating device and an electronic device, aiming to solve the technical problems that the sound absorption particles filled in the rear cavity of the existing speaker are easy to break and affect the low-frequency performance of the speaker.

[0005] To achieve the above object, the utility model provides a sound absorption component, including a housing and a sound absorption material filled in the housing. Among them, the housing includes a porous structure to have a sound absorption function, the sound absorption coefficient of the housing > 0.22, the sound absorption material includes at least one of sound absorption particles and sound absorption raw powder, and the sound absorption particles include a plurality of sound absorption raw powders and a binder that bonds the plurality of sound absorption raw powders into one body.

[0006] In one embodiment, the porous structure of the housing is formed by stacking fiber filaments, and the fiber filaments include at least one of chemical fibers, modified chemical fibers and natural fibers.

[0007] In one embodiment, the melting point of the fiber filaments is greater than 100 °C; and / or, the wire diameter of the fiber filaments is 0.05 - 10 μm.

[0008] In one embodiment, the housing includes a main body portion and a cover portion. The main body portion defines a receiving space, and the sound-absorbing material is filled in the receiving space. The cover portion is disposed on the main body portion to seal the receiving space. Wherein, the main body portion is a porous structure, and the cover portion is a porous structure or a closed structure.

[0009] In one embodiment, the areal density of the main body portion is 15 - 500 g / m 2 ; the thickness of the main body portion is 0.05 - 3.5 mm; the air permeability of the main body portion is 100 - 1000 mm / s.

[0010] In one embodiment, the cover portion is double-sided adhesive tape, hot melt adhesive film, plastic film or the same material as the main body portion, and the main body portion and the cover portion are connected by hot melt encapsulation or gluing.

[0011] In one embodiment, the particle size of the sound-absorbing raw powder is 0.5 - 100 μm; and / or, the particle size of the sound-absorbing particles is 100 - 800 μm.

[0012] In one embodiment, the sound-absorbing material includes at least one of activated carbon, natural zeolite, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomite, silica aerogel, and organic polymer aerogel.

[0013] In one embodiment, the volume of the sound-absorbing material occupies more than 40% of the internal volume of the housing; and / or, the ratio of the pore volume of micropores to the pore volume of mesopores in the sound-absorbing material is greater than 0.45.

[0014] The present invention further provides a sound generating device, including a sound generating element, a housing, and an internal cavity formed by the housing and the sound generating element, wherein the internal cavity is filled with the sound-absorbing component according to any one of claims 1 to 9.

[0015] In one embodiment, the housing includes a first housing and a second housing disposed opposite to each other, and the sound-absorbing component is clamped between the first housing and the second housing;

[0016] Or, an adhesive layer is provided on the inner wall of the housing, and the adhesive layer is adhesively connected to the sound-absorbing component.

[0017] The present invention further provides an electronic device, including the sound generating device as described above.

[0018] The present utility model provides a sound absorption component, a sound generating device and an electronic device. The sound absorption component includes a housing and a sound absorption material filled in the housing. Among them, the housing includes a porous structure to have a sound absorption function, the sound absorption coefficient of the housing > 0.22, the sound absorption material includes at least one of sound absorption particles and sound absorption raw powder, and the sound absorption particles include a plurality of sound absorption raw powders and a binder that bonds the plurality of sound absorption raw powders into one body. The housing has a packaging function, which can limit the sound absorption material in the housing, avoid powder pollution of the sound generating monomer caused by the collision and breakage of the sound absorption particles, and the sound absorption coefficient of the housing > 0.22, that is, the housing itself has a certain sound absorption effect, and the overall sound absorption effect of the sound absorption component is improved, thereby improving the low-frequency acoustic performance of the sound generating device. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present drawings or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments or related technologies. Obviously, the following drawings are only some embodiments of the present drawings. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is a cross-sectional view of an embodiment of the sound absorption component related to the present utility model;

[0021] Figure 2 It is a cross-sectional view of another embodiment of the sound absorption component related to the present utility model;

[0022] Figure 3 It is a cross-sectional view of another embodiment of the sound absorption component related to the present utility model using adhesive connection;

[0023] Figure 4 It is a cross-sectional view of an embodiment of the sound generating device related to the present utility model;

[0024] Figure 5 It is a cross-sectional view of another embodiment of the sound generating device related to the present utility model.

[0025] Description of the Reference Numerals:

[0026] 100, sound generating device; 110, sound generating monomer;

[0027] 120, outer shell; 121, first housing; 122, second housing;

[0028] 130, sound absorption component; 131, housing; 131a, main body part; 131b, cover part; 132, sound absorption material; 133, adhesive layer;

[0029] 140, rear sound cavity.

[0030] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] An embodiment of the present utility model provides a sound-absorbing component 130. Figure 1 It is a sectional view of a sound-absorbing component in an embodiment of the present utility model. Refer to Figure 1 , the sound-absorbing component 130 includes a housing 131 and a sound-absorbing material 132 filled in the housing 131. Among them, the housing 131 includes a porous structure to have a sound-absorbing function, the sound absorption coefficient of the housing 131 > 0.22, the sound-absorbing material 132 includes at least one of sound-absorbing particles and sound-absorbing raw powder, the sound-absorbing particles include a plurality of sound-absorbing raw powders and a binder that bonds the plurality of sound-absorbing raw powders into one body. It can be understood that Figure 1 shows the case where the sound-absorbing material 132 is sound-absorbing raw powder, and the case where the sound-absorbing material 132 is sound-absorbing particles is shown in Figure 2 .

[0033] In this embodiment, the sound absorption coefficient of the housing 131 is greater than 0.22. For example, it is 0.23, 0.25, 0.28, 0.3, 0.33, 0.35, 0.4, 0.45, 0.5, etc. It can be understood that the sound absorption coefficient can characterize the ability of the material to absorb sound energy. The greater the sound absorption coefficient of the housing 131, the stronger its sound absorption ability, and the reflection and resonance of sound waves can be reduced. The sound absorption coefficient of the housing 131 is greater than 0.22, which also has the function of improving the resonance frequency of the sound generating device 100. Thus, on the basis that the sound-absorbing material 132 has a sound-absorbing effect, the overall sound-absorbing effect of the sound-absorbing component 130 can be improved, which is beneficial to further improving the low-frequency performance of the sound generating device 100.

[0034] Moreover, in some embodiments of the present utility model, the sound-absorbing material 132 can include both sound-absorbing particles and sound-absorbing raw powder at the same time. Since the particle sizes of the sound-absorbing particles and the sound-absorbing raw powder are different, and the sound-absorbing raw powder can be filled in the gaps between adjacent sound-absorbing particles, the filling amount of the sound-absorbing material 132 in the sound-absorbing component 130 can be increased, thereby improving the sound-absorbing effect of the sound-absorbing component 130.

[0035] In some feasible embodiments, the porous structure of the housing 131 is formed by stacking fiber filaments, and the fiber filaments include at least one of chemical fibers, modified chemical fibers, and natural fibers. Specifically, the chemical fibers that can be used include polypropylene fibers, viscose fibers, polyamide fibers, polyester fibers, polyacrylonitrile fibers, etc. The modified chemical fibers can be prepared by modifying the above chemical fibers such as polypropylene fibers, viscose fibers, polyamide fibers, polyester fibers, polyacrylonitrile fibers, etc. Natural fibers include cotton, hemp, wool, silk, etc. There are many types and wide sources of fiber filaments that can be used in this embodiment. One type of fiber filament can be selected according to the actual product performance requirements, or two or more types of fiber filaments can be mixed.

[0036] In some feasible embodiments, the melting point of the fiber filaments is greater than 100 °C. For example, 110 °C, 120 °C, 130 °C, 140 °C, etc. It can be understood that the temperature of the rear cavity of the sound generating device 100 can reach 100 °C. Selecting the melting point of the fiber filaments to be greater than 100 °C can prevent the housing 131 from melting. After the fiber filaments melt, parameters such as the porous structure and the air permeability of the holes of the main body housing 131 are affected, which will cause an impact on the acoustic performance. Therefore, selecting the melting point of the fiber filaments to be greater than 100 °C helps the sound absorption component 130 to maintain the acoustic performance in a high-temperature working environment.

[0037] In some feasible embodiments, the filament diameter of the fiber filaments 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. It can be understood that the smaller the filament diameter of the fiber filaments, the thinner the thickness of the formed housing 131 can be, and a better air permeability can be obtained. When the filament diameter exceeds 10 μm, the formed pore diameter is larger, the air permeability is larger, and it is not easy to encapsulate the sound absorption material 132. The minimum value of the filament diameter in this embodiment can reach 0.05 μm, forming a film material with excellent thickness and air permeability performance for making the housing 131.

[0038] In some feasible embodiments, the housing 131 includes a main body portion 131a and a cover portion 131b. The main body portion 131a defines an accommodation space, and the sound absorption material 132 is filled in the accommodation space. The cover portion 131b is disposed on the main body portion 131a to seal the accommodation space. Among them, the main body portion 131a is a porous structure, and the cover portion 131b is a porous structure or a closed structure. It can be understood that the porous structure has a sound absorption function. The cover portion 131b can adopt the same porous structure as the main body portion 131a to enhance the overall sound absorption effect of the sound absorption component 130, or it can be a closed structure to provide good sealing performance.

[0039] In some feasible embodiments, the areal density of the main body portion 131a is 15 - 500 g / m 2 For example, 15 g / m 2, 20 g / m 2 , 50 g / m 2 , 100 g / m 2 , 150 g / m 2 , 200 g / m 2 , 250 g / m 2 , 300 g / m 2 , 350 g / m 2 , 400 g / m 2 , 450 g / m 2 , 500 g / m 2 etc. It can be understood that if the areal density of the main body portion 131a is too small, its porous structure is sparse and it cannot effectively encapsulate the sound-absorbing material 132. While if the areal density is too large and the structure is too dense, it will affect the inflow and outflow of air, affect the air adsorption and desorption function of the internal sound-absorbing material 132, and occupy too much rear cavity space. Controlling the areal density of the main body portion 131a within a suitable range can effectively encapsulate the sound-absorbing material 132 and avoid adversely affecting the gas adsorption and desorption function of the sound-absorbing material 132. The areal density of the main body portion 131a can be further controlled within the range of 35 - 100 g / m 2 to obtain a structure of the main body portion 131a that can both effectively encapsulate the sound-absorbing material 132 and have good acoustic performance.

[0040] In some feasible embodiments, the thickness of the main body portion 131a is 0.05 - 3.5 mm, for example, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 3.5 mm, etc. It can be understood that if the thickness of the main body portion 131a is too thin, the porous structure composed of fiber filaments is loose and it cannot effectively encapsulate the sound-absorbing material 132. While if the thickness is too thick, it will affect the inflow and outflow of air inside and outside the main body portion 131a, affect the air adsorption and desorption function of the internal sound-absorbing material 132, and occupy too much rear cavity space. Controlling the thickness of the main body portion 131a within the range of 0.05 - 3.5 mm can, while encapsulating the sound-absorbing material 132, keep the smooth inflow and outflow of the gas in the rear cavity. The thickness of the main body portion 131a can be further controlled within the range of 0.1 - 1 mm to obtain the best air permeability.

[0041] In some feasible embodiments, the air permeability of the main body portion 131a is 100 - 1000 mm / s. For example, it can be 100 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. It can be understood that if the air permeability is too small, the efficiency of the gas in the rear cavity passing through the main body portion 131a will decrease, affecting the adsorption and desorption speed of the internal sound-absorbing material 132, and further affecting the sound-absorbing effect. If the air permeability is too large, it means that the size of the holes in the main body portion 131a is relatively large or the hole structure composition is relatively sparse, which is likely to affect the encapsulation effect of the sound-absorbing material 132 and cause powder leakage problems. Controlling the air permeability of the main body portion 131a within a suitable range can not only encapsulate the sound-absorbing material 132, but also its stacked hole structure can provide certain acoustic performance.

[0042] In some feasible embodiments, the cover portion 131b is double-sided adhesive, hot melt adhesive film, plastic film or the same material as the main body portion 131a, and the main body portion 131a and the cover portion 131b are connected by hot melt encapsulation or gluing. It can be understood that the cover portion 131b is covered on the main body portion 131a to confine the sound-absorbing material 132 in the housing 131. The cover portion 131b can be selected from materials with certain bonding functions such as double-sided adhesive and hot melt adhesive film, or it can also be selected as plastic film or the same material as the main body portion 131a. When the main body portion 131a and the cover portion 131b are made of the same material, the cover portion 131b also has the function of improving the resonance frequency of the sound generating device 100 like the main body portion 131a. The connection method between the main body portion 131a and the cover portion 131b can be selected according to the materials of the two. For example, when the main body portion 131a and the cover portion 131b are made of the same material, hot melt encapsulation is adopted; when the main body portion 131a and the cover portion 131b are made of different materials and the self-bonding effect between the two materials is insufficient, gluing connection is adopted. Figure 3 The sectional view of the sound-absorbing component 130 using gluing connection is as Figure 3 shown. The sound-absorbing component 130 includes a housing 131 and a sound-absorbing material 132 filled in the housing 131. The housing 131 includes a main body portion 131a and a cover portion 131b. A glue layer 133 is provided between the main body portion 131a and the cover portion 131b to connect the main body portion 131a and the cover portion 131b.

[0043] The sound-absorbing material 132 in this embodiment includes at least one of sound-absorbing particles and sound-absorbing raw powder. The sound-absorbing particles include a plurality of sound-absorbing raw powders and a binder that bonds the plurality of sound-absorbing raw powders into one body. It can be understood that both the sound-absorbing particles and the sound-absorbing raw powder have a sound-absorbing effect. The size of the sound-absorbing raw powder is smaller than that of the sound-absorbing particles, and smaller gap spaces are generated after filling. The sound-absorbing particles can be spherical, such as solid spheres, or spheres with recessed holes, and the recessed holes can form channels for air circulation to communicate with the external space to achieve a better sound-absorbing effect.

[0044] In some feasible embodiments, the particle size of the sound-absorbing raw powder is 0.5 - 100 μm. For example, 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 30 μm, 50 μm, 80 μm, 100 μm, etc. It can be understood that the smaller the particle size of the sound-absorbing raw powder, the smaller the gap spaces can be generated when filled in the housing 131. However, too small a particle size will cause it to leak out of the housing 131 more easily, and there may also be certain differences in the properties of sound-absorbing raw powders with different particle sizes when bonded to form sound-absorbing particles. The sound-absorbing raw powder with different particle sizes can be selected as the sound-absorbing material 132 according to actual needs, or bonded to form sound-absorbing particles.

[0045] In some feasible embodiments, the particle size of the sound-absorbing particles is 100 - 800 μm. For example, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, etc. It can be understood that the smaller the particle size of the sound-absorbing particles, the greater the filling quantity in the housing 131. The larger the particle size of the sound-absorbing particles, the more binder is used in the manufacturing process, and the worse the particle performance. The particle size range of the sound-absorbing particles that can be used in this embodiment is relatively wide, which can achieve a certain filling quantity and has a good sound-absorbing effect.

[0046] In some feasible embodiments, the sound-absorbing material 132 includes at least one of activated carbon, natural zeolite, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomite, silica aerogel, and organic polymer aerogel. It can be understood that the above-mentioned types of materials all have a porous structure and can produce a sound-absorbing effect through the pore structure inside. There are also differences in physical properties and other aspects between different materials. The appropriate sound-absorbing material 132 can be selected according to actual considerations of factors such as sound-absorbing effect and filling difficulty to manufacture the sound-absorbing component 130.

[0047] In some feasible embodiments, the volume of the sound-absorbing material 132 occupies more than 40% of the internal volume of the housing 131. For example, it is 45%, 50%, 60%, 70%, 85%, 100%, etc. It can be understood that the housing 131 needs to occupy a certain volume in the rear cavity. The sound-absorbing material 132 is located in the accommodating space of the housing 131. When the proportion of the volume of the sound-absorbing material 132 in the volume of the accommodating space is less than 40%, the entire sound-absorbing assembly 130 occupies a certain volume but cannot provide an effective acoustic improvement effect. Therefore, the proportion of the volume of the sound-absorbing material 132 in the volume of the accommodating space is greater than 40%. In the case of occupying a certain volume, the filling quantity of the sound-absorbing material 132 is larger, the number of pore channels in the sound-absorbing material 132 is more, which is more conducive to the adsorption and desorption of the gas in the rear cavity and provides a better acoustic improvement effect.

[0048] In some feasible embodiments, the ratio of the pore volume of the micropores to the pore volume of the mesopores in the sound-absorbing material is greater than 0.45. For example, it is 0.48, 0.5, 0.55, 0.6, 0.65, 0.7, 0.8, 1, 1.1, 2, etc. Specifically, the pore diameter of the micropores is smaller than that of the mesopores. The micropores can adsorb and desorb nitrogen and oxygen molecules in the air. If the proportion of the pore volume of the micropores is less than 0.45, the adsorption and desorption function of the sound-absorbing material 132 to the air will decline, affecting the acoustic performance. The sound-absorbing material 132 with a pore distribution ratio of the micropores greater than 0.45 will have better acoustic performance.

[0049] In this embodiment, the housing 131 has a packaging function, which can confine the sound-absorbing material 132 within the housing 131, avoiding the powder pollution of the sounding monomer caused by the collision and fragmentation of the sound-absorbing particles. Moreover, the sound absorption coefficient of the housing 131 > 0.22, that is, the housing 131 itself has a certain sound absorption effect, and the overall sound absorption effect of the sound-absorbing assembly 130 is improved, thereby improving the low-frequency acoustic performance of the sounding device 100.

[0050] The embodiment of the present utility model further provides a sounding device 100. Referring to Figure 4 , the sounding device 100 includes a sounding monomer 110, a housing 120, and an internal cavity surrounded by the housing 120 and the sounding monomer 110. The above-mentioned sound-absorbing assembly 130 is filled in the internal cavity. The sounding monomer 110 divides the housing 120 into a front sound cavity and a rear sound cavity 140, and the sound-absorbing assembly 130 can be filled in the rear sound cavity 140.

[0051] Optionally, referring to Figure 5, the housing 120 includes a first housing 121 and a second housing 122 which are oppositely arranged, and the sound-absorbing component 130 is clamped between the first housing 121 and the second housing 122; alternatively, an adhesive layer is provided on the inner wall of the housing 120, and the adhesive layer is adhesively connected to the sound-absorbing component 130. Through the space-limiting effect of the first housing 121 and the second housing 122, the sound-absorbing component 130 is restricted in the cavity of the rear sound cavity 140 of the sound generating device 100. Or the sound-absorbing component 130 can be attached to the inner wall of at least one side of the rear sound cavity 140 through the setting of an adhesive layer such as double-sided tape.

[0052] The sound generating device 100 provided by the present utility model solves the technical problem that the sound-absorbing particles are easily broken, resulting in the pollution of the sound generating monomer 110. Compared with the prior art, the beneficial effects of the sound generating device 100 provided by the embodiments of the present utility model can refer to the beneficial effects of the sound-absorbing component 130 in the above embodiments, and will not be elaborated herein.

[0053] An embodiment of the present utility model further provides an electronic device, and the electronic device includes the sound generating device 100 as described in the above embodiment.

[0054] In this embodiment, the electronic device includes a mobile phone, a notebook computer, a tablet computer, a VR (Virtual Reality) device, an AR (Augmented Reality) device, a TWS (True Wireless Stereo) headset, a smart speaker, a smart wearable device, etc.

[0055] Compared with the prior art, the beneficial effects of the electronic device provided by the embodiments of the present utility model are the same as those of the sound generating device 100 in the above embodiments, and will not be elaborated herein.

[0056] The sound-absorbing component 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. Moreover, the selection of the comparative examples is to prove the technological progress existing in the technical solution of the present utility model, and the technical solutions in the comparative examples are not all conventional technologies in this technical field.

[0057] Embodiment 1

[0058] Both the main body part 131a and the cover part 131b are made of a porous structure film material stacked by PP fiber filaments. The sound absorption coefficient of the film material is 0.41, the thickness of the film material is 0.15 mm, the air permeability of the film material is 260 mm / s, and the surface density of the film material is 30 g / m 2 . The sound-absorbing material 132 is selected as ZSM-5 zeolite powder, with an average particle size of 2 μm and a silica-alumina ratio of 500.

[0059] The preparation process of the sound-absorbing component 130 refers to the following steps:

[0060] 1. Place the membrane material in a conforming tooling made according to the shape of the rear cavity space. The internal volume of the tooling is 0.3 ml, and the upper and lower molds are closed.

[0061] 2. Place the tooling on the heating table of the vulcanizer, set the heating temperature to 130 °C, the pressure to 0.1 MPa, and keep the temperature and pressure for 60 s.

[0062] 3. After the hot pressing is completed, take out the cooled tooling and open the mold to obtain the main body part 131a with a space-conforming shape.

[0063] 4. Fill the accommodation space of the main body part 131a obtained by stamping with ZSM-5 zeolite powder until the accommodation space of the main body part 131a is filled with 100% volume.

[0064] 5. Place the flat membrane material on the upper surface of the main body part 131a filled with ZSM-5 zeolite powder, and then perform secondary hot pressing with a flat mold at a temperature of 160 °C, a pressure of 0.1 MPa, and keep the temperature and pressure for 60 s.

[0065] 6. After the secondary hot pressing is completed, open the mold and take out the encapsulated housing 131 to obtain the sound-absorbing component 130 containing ZSM-5 zeolite powder as the sound-absorbing material.

[0066] 7. Load the obtained sound-absorbing component 130 with a volume of 0.3 ml into a speaker with a rear cavity volume of 0.36 ml, and complete the assembly to obtain the overall speaker.

[0067] Example 2

[0068] Both the main body part 131a and the cover part 131b are made of a porous structure membrane material stacked by PP fiber filaments. The sound absorption coefficient of the membrane material is 0.41, the thickness of the membrane material is 0.15 mm, the air permeability of the membrane material is 260 mm / s, and the surface density of the membrane material is 30 g / m 2 . The sound-absorbing material 132 is selected as ZSM-5 zeolite sound-absorbing particles (formed by bonding multiple ZSM-5 zeolite powders with a binder), with a particle size of 300 - 400 μm and a silicon-aluminum ratio of 500.

[0069] The preparation process of the sound-absorbing component 130 refers to the following steps:

[0070] 1. Place the membrane material in a conforming tooling made according to the shape of the rear cavity space. The internal volume of the tooling is 0.3 ml, and the upper and lower molds are closed.

[0071] 2. Place the tooling on the heating table of the vulcanizer, set the heating temperature to 130 °C, the pressure to 0.1 MPa, and keep the temperature and pressure for 60 s.

[0072] 3. After the hot pressing is completed, take out the cooled tooling, and open the mold to obtain the spatially conformal main body 131a.

[0073] 4. Fill the accommodation space of the main body 131a obtained by stamping with ZSM-5 zeolite sound-absorbing particles until the accommodation space of the main body 131a is filled with 100% volume.

[0074] 5. Place the flat membrane material on the upper surface of the main body 131a filled with ZSM-5 zeolite sound-absorbing particles, and then perform secondary hot pressing with a flat mold at a temperature of 160 °C, a pressure of 0.1 MPa, and keep the temperature and pressure for 60 s.

[0075] 6. After the secondary hot pressing is completed, open the mold and take out the encapsulated housing 131 to obtain the sound-absorbing component 130 containing ZSM-5 zeolite sound-absorbing particles as the sound-absorbing material.

[0076] 7. Load the obtained sound-absorbing component 130 with a volume of 0.3 ml into a speaker with a rear cavity volume of 0.36 ml, and complete the assembly to obtain the overall speaker.

[0077] Comparative Example 1

[0078] Use a 0.3 ml funnel measuring cup to take 0.3 ml of ZSM-5 zeolite sound-absorbing particles with a particle size of 300 - 400 μm (particles formed by bonding multiple ZSM-5 zeolite powders with a binder), with a silica-alumina ratio of 500, and fill them into a speaker with a rear cavity volume of 0.36 ml. The filling port is sealed with PET, and the overall speaker is assembled.

[0079] Comparative Example 2

[0080] The main body 131a is made of PET plastic. The cover part 131b is made of a breathable mesh cloth with an average pore size of 30 μm. The sound-absorbing material 132 is selected as ZSM-5 zeolite sound-absorbing particles (formed by bonding multiple ZSM-5 zeolite powders with a binder), with a particle size of 300 - 400 μm and a silica-alumina ratio of 500.

[0081] The preparation process of the sound-absorbing component 130 refers to the following steps:

[0082] 1. Place the PET plastic in a conformal tooling made according to the shape of the rear cavity space. The internal volume of the tooling is 0.3 ml, and the upper and lower molds are closed.

[0083] 2. Place the tooling on the heating table of the vulcanizer, set the heating temperature to 150 °C, the pressure to 0.1 MPa, and keep the temperature and pressure for 60 s.

[0084] 3. After the hot pressing is completed, take out the cooled tooling, and open the mold to obtain the spatially conformal main body 131a.

[0085] 4. Fill the accommodation space of the main body part 131a obtained by stamping with ZSM-5 zeolite sound-absorbing particles until the accommodation space of the main body part 131a is filled with 100% volume.

[0086] 5. Place the breathable mesh cloth with double-sided tape on the upper surface of the main body part 131a filled with ZSM-5 zeolite sound-absorbing particles, and then perform secondary normal-temperature pressing with a flat die, with a pressure of 0.1 MPa, heat preservation and pressure holding for 60 s.

[0087] 6. After the pressing is completed, open the die and take out the encapsulated housing 131 to obtain the sound-absorbing component 130 containing ZSM-5 zeolite sound-absorbing particles as the sound-absorbing material.

[0088] 7. Load the obtained sound-absorbing component 130 into a speaker with a rear cavity volume of 0.36 ml, and complete the assembly to obtain the overall speaker.

[0089] Comparative Example 3

[0090] Both the main body part 131a and the cover part 131b are made of a porous structure film material stacked by PP fiber filaments. The sound absorption coefficient of the film material is 0.41, the thickness of the film material is 0.15 mm, the air permeability of the film material is 260 mm / s, and the surface density of the film material is 30 g / m 2 。

[0091] The preparation process of the sound-absorbing component 130 refers to the following steps:

[0092] 1. Place the film material in a conforming tooling made according to the shape of the rear cavity space. The internal volume of the tooling is 0.32 ml, and the upper and lower dies are closed.

[0093] 2. Place the tooling on the heating table of the vulcanizer, set the heating temperature to 130 °C, the pressure to 0.1 MPa, and heat preservation and pressure holding for 60 s.

[0094] 3. After the hot pressing is completed, take out the cooled tooling and open the die to obtain the main body part 131a with a space conforming shape.

[0095] 4. Place the flat film material on the upper surface of the main body part 131a, and then perform secondary hot pressing with a flat die at a temperature of 160 °C, a pressure of 0.1 MPa, and heat preservation and pressure holding for 60 s.

[0096] 5. After the secondary hot pressing is completed, open the die and take out the encapsulated housing 131 to obtain the sound-absorbing component 130.

[0097] 6. Load the obtained sound-absorbing component 130 with a volume of 0.32 ml into a speaker with a rear cavity volume of 0.4 ml, and complete the assembly to obtain the overall speaker.

[0098] It should be noted that the speakers used in the above Examples 1-2 and Comparative Examples 1-3 are all speakers of the same model.

[0099] Acoustic performance evaluation: IMP (Impedance) tests were carried out on the speakers assembled in Examples 1-2 and Comparative Examples 1-3, and the resonance frequency F0 results of each group of speakers are shown in Table 1 below.

[0100] Table 1

[0101]

[0102] As can be seen from the results in Table 1, when comparing the speaker of Example 1 with the speaker of Example 2, the F0 of the speaker in Example 1 is 9 Hz lower than that of the speaker in Example 2, indicating that the acoustic performance of the sound-absorbing material 132 in the form of sound-absorbing raw powder is better than that of the sound-absorbing material 132 in the form of sound-absorbing particles. This is mainly because the particle size of the sound-absorbing raw powder is smaller, the gap space formed after filling is smaller, the effective filling volume of the rear cavity of the speaker is larger, and the sound-absorbing raw powder does not require the use of a binder, eliminating the influence of the binder on the partial blockage of the powder pores and performance loss. When comparing the speaker of Example 1 with the speaker of Comparative Example 1, the F0 of the speaker in Example 1 is 20 Hz lower, indicating that the combination of the housing 131 and the sound-absorbing material in the form of sound-absorbing raw powder in the sound-absorbing component 130 of the present invention has a stronger ability to improve acoustic performance than the form of pure sound-absorbing particle filling. On the one hand, this is because the housing 131 has a certain sound-absorbing effect, and the sound-absorbing material 132 in the form of sound-absorbing raw powder has a better sound-absorbing effect than the sound-absorbing material 132 in the form of sound-absorbing particles. When comparing the speaker of Example 2 with the speaker of Comparative Example 2, the F0 of the speaker in Example 2 is 15 Hz lower, indicating that in the sound-absorbing component 130 of the present invention, the porous structure housing 131 formed by stacking fiber filaments has a better effect of reducing F0 than the form encapsulated by other plastic housings 131, and will not affect the acoustic performance due to the addition of the housing 131. This is because the porous structure housing 131 itself also has a sound-absorbing function. The F0 performance of the speaker in Comparative Example 2 is 4 Hz higher than that of the speaker in Comparative Example 1, indicating that the use of the plastic housing 131 will occupy the volume of the rear cavity and affect the resonance frequency F0 of the speaker. It shows that the porous structure film material used for the housing 131 of the present invention has better advantages, and the porous structure can bring a sound-absorbing effect. When there is only the housing 131 material in the sound-absorbing component 130 of the speaker in Comparative Example 3, the resonance frequency of the speaker can be reduced by 11 Hz, indicating that the housing 131 itself has the performance of acoustic improvement. In summary, the sound-absorbing component 130 provided by the present invention has a better effect of reducing the resonance frequency of the speaker.

[0103] Drum drop test: Assemble the speakers of two groups of Examples 1-2 and Comparative Examples 1-3 in a 200 g drop tooling, drop from a height of 1 m, and drop 400 times. After the experiment, disassemble the product and observe the powder pollution situation in the rear cavity. The test results are shown in Table 2 below.

[0104] Table 2

[0105] Experimental group Powder contamination condition in the rear cavity after disassembling the product Example 1 None Example 2 None Comparative example 1 There is broken powder contamination

[0106] As can be seen from the results in Table 2, there is no powder shedding in both Example 1 and Example 2, while the particles in Comparative Example 1 are contaminated with broken powder. This is because the membrane materials used in the housing 131 of Example 1 and Example 2 have appropriate areal density, thickness and air permeability. While providing certain acoustic improvement performance, they can effectively encapsulate the filled sound-absorbing material 132 through the encapsulation effect of the housing 131, indicating that the sound-absorbing component 130 of the present invention effectively avoids the situation of broken powder of the sound-absorbing particles and is more resistant to harsh reliability conditions.

[0107] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A sound-absorbing component, characterized in that, It includes a housing and sound-absorbing material filled in the housing. Among them, the housing includes a porous structure to have a sound-absorbing function, the sound absorption coefficient of the housing > 0.22, the sound-absorbing material includes at least one of sound-absorbing particles and sound-absorbing raw powder, and the sound-absorbing particles include a plurality of sound-absorbing raw powders and a binder that bonds the plurality of sound-absorbing raw powders into one body.

2. The sound-absorbing component according to claim 1, wherein The porous structure of the housing is formed by stacking fiber filaments, and the fiber filaments include at least one of chemical fibers, modified chemical fibers, and natural fibers.

3. The sound absorption component according to claim 2, wherein The melting point of the fiber filaments is greater than 100 °C; and / or, the filament diameter of the fiber filaments is 0.05 - 10 μm.

4. The sound absorption component according to claim 1, characterized in that The housing includes a main body part and a cover part. The main body part defines an accommodation space, the sound-absorbing material is filled in the accommodation space, and the cover part is covered on the main body part to seal the accommodation space. Among them, the main body part is a porous structure, and the cover part is a porous structure or a closed structure.

5. The sound absorption component according to claim 4, wherein The areal density of the main body is 15 - 500 g / m 2 ; the thickness of the main body is 0.05 - 3.5 mm; the air permeability of the main body is 100 - 1000 mm / s.

6. The sound-absorbing component according to claim 4, characterized in that, The cover part is double-sided tape, a hot-melt adhesive film, a plastic film, or the same material as the main body part, and the main body part and the cover part are connected by hot-melt encapsulation or gluing.

7. The sound-absorbing component according to claim 1, wherein The particle size of the sound-absorbing raw powder is 0.5 - 100 μm; and / or, the particle size of the sound-absorbing particles is 100 - 800 μm.

8. The sound-absorbing component according to claim 1, wherein, The sound-absorbing material includes at least one of activated carbon, natural zeolite, porous silica, porous alumina, molecular sieve, MOF metal-organic framework material, COF covalent organic framework material, kaolin, diatomaceous earth, silica aerogel, and organic polymer aerogel.

9. The sound absorption component according to claim 1, wherein The volume of the sound-absorbing material occupies more than 40% of the internal volume of the housing; and / or, the ratio of the pore volume of micropores to the pore volume of mesopores in the sound-absorbing material is greater than 0.

45.

10. A sound generating device, characterized in that, It includes a sounding monomer, a housing, and an internal cavity surrounded by the housing and the sounding monomer. The internal cavity is filled with the sound-absorbing component according to any one of claims 1 to 9.

11. The sound generating device according to claim 10, wherein The housing includes a first housing and a second housing arranged opposite to each other, and the sound-absorbing component is clamped between the first housing and the second housing; Or, an adhesive layer is provided on the inner wall of the housing, and the adhesive layer is adhesively connected to the sound-absorbing component.

12. An electronic device, characterized in that, It includes the sounding device according to claim 10 or 11.

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