WO2018040394A1 - Loudspeaker module - Google Patents
Loudspeaker module Download PDFInfo
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- WO2018040394A1 WO2018040394A1 PCT/CN2016/111112 CN2016111112W WO2018040394A1 WO 2018040394 A1 WO2018040394 A1 WO 2018040394A1 CN 2016111112 W CN2016111112 W CN 2016111112W WO 2018040394 A1 WO2018040394 A1 WO 2018040394A1
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- aluminosilicate
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- zeolite
- zeolite particles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/06—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis
- C01B39/08—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis the aluminium atoms being wholly replaced
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Definitions
- the invention belongs to the technical field of loudspeakers, and in particular to a loudspeaker module.
- the speaker module is an indispensable component in electro-acoustic products.
- the speaker module is usually composed of a casing and a speaker unit, and the speaker unit divides the inner cavity of the module casing into two chambers of a front sound chamber and a rear sound chamber.
- a sound absorbing member is usually added in the rear sound chamber, and the sound absorbing member absorbs part of the sound energy, which is equivalent to expanding the volume of the rear cavity, thereby Achieve the effect of reducing the module F0.
- Conventional sound absorbing members are foamed foams such as polyurethane, melamine and the like.
- a porous material such as activated carbon, natural zeolite powder, active silica, molecular sieve or according to a specific type and ratio
- the mixture is filled into the rear acoustic cavity, and the special physical pore structure inside the porous material is used to realize rapid adsorption-desorption of the gas in the rear acoustic cavity, thereby achieving the effect of virtually increasing the resonance space of the acoustic cavity after the speaker.
- This method can reduce the resonant frequency F0 of the speaker and improve the sensitivity of the low frequency sound.
- a speaker module comprising:
- module housing having a receiving cavity
- a speaker assembly disposed in the accommodating cavity, the speaker assembly dividing the accommodating cavity into a rear acoustic cavity and a front sounding zone;
- the aluminosilicate-free zeolite particles being composed of the zeolite raw powder particles bonded by an adhesive;
- the zeolite raw powder particles have a first-order pore having a pore diameter ranging from 0.3 to 20 nm, and in the aluminosilicate-free zeolite particles, the zeolite raw powder particles have a second-order pore between them .
- the primary channel comprises micropores and/or mesopores, the micropores having a pore size of less than 2 nm, and the mesopores having a pore size ranging from 2 to 20 nm. More preferably, the pores have a pore size ranging from 0.4 to 0.8 nm, and the mesopores have a pore size ranging from 2 to 10 nm.
- the zeolite raw powder particles are prepared by hydrothermal crystallization of a silicon source material, a templating agent, and an auxiliary material.
- the zeolite raw powder particles are of an MFI zeolite structure.
- the aluminosilicate-free zeolite particles have a specific surface area ranging from 250 to 550 m 2 /g.
- the aluminosilicate-free zeolite particles have a surface layer binder content higher than the internal binder content.
- the aluminosilicate-free zeolite particles are spherical or ellipsoidal, and the aluminosilicate-free zeolite particles have an aspect ratio of less than 1.5 and a particle size ranging from 0.05 to 0.50 mm.
- the aluminosilicate-free zeolite particles have an elastic deformation displacement greater than 20 microns.
- the virgin powder particles have a particle size ranging from 0.2 to 5 microns.
- the mass ratio of the binder in the aluminosilicate-free zeolite particles ranges from 5 to 15%.
- the aluminosilicate-free zeolite particles contain a doping element, and the doping element includes at least one of boron, iron, titanium, potassium, calcium, tin, antimony, and cerium.
- the inventors of the present invention have found that in the prior art, a novel non-foamed porous sound absorbing material It has a better sound absorbing effect than the conventional sound absorbing material, and the performance of the new non-foaming sound absorbing material is generally recognized by those skilled in the art. Therefore, in the case where it is required to further reduce the resonance frequency of the speaker, those skilled in the art will select a technical means for improving the structure of the speaker. Further research and improvement on the acoustic properties of non-foamed sound absorbing materials will not be considered. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.
- Figure 1 is a schematic view of the aluminosilicate-free zeolite particles provided by the present invention
- FIG. 2 is a microscopic schematic view of the aluminosilicate-free zeolite particles provided by the present invention
- Figure 3 is a graph showing the anti-aging performance of zeolite particles of different structures
- Figure 4 is a graph showing the internal composition of the aluminosilicate-free zeolite particles provided by the present invention.
- the invention provides a speaker module, which comprises a module housing, a speaker assembly and aluminosilicate-free zeolite particles.
- the module housing has a receiving cavity therein, and the speaker assembly is disposed in the receiving cavity.
- the speaker assembly typically includes a vibrating assembly, a magnetic circuit assembly, etc., and the speaker assembly divides the receiving chamber into a front sounding zone and a rear sounding cavity.
- the vibration component generates vibration according to the received sound signal to emit a sound, and the sound propagates from the front sounding area to the outside of the speaker module.
- the sound that propagates from the vibrating assembly to the rear chamber is absorbed by the rear chamber.
- zeolite raw powder particles 1 are filled in the rear acoustic chamber for adsorbing the air in the acoustic chamber, and the aluminosilicate-free zeolite particles 1 are bonded by the zeolite raw powder particles through an adhesive. form.
- the aluminosilicate-free zeolite particles 1 of the present invention means that the zeolite particles and the zeolite raw powder particles do not contain aluminum. It is detected as an aluminum-free element by atomic absorption spectroscopy or atomic fluorescence spectroscopy. Doping elements such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, etc. may be present in the aluminosilicate-free zeolite particles 1 or the zeolite raw powder particles for surface modification and modification of the zeolitic material. ⁇ , ⁇ , etc.
- the aluminosilicate-free zeolite particles 1 have a significant improvement in adsorption-desorption of air molecules and anti-aging ability in comparison with aluminosilicate zeolite particles having a silicon to aluminum ratio of 420. .
- a quantity of 0.15 g of the aluminosilicate-free zeolite particles 1 or aluminosilicate 420 particles of aluminosilicate ratio of 420 was filled in, as shown in the following table:
- Silicate zeolite particle sample Aluminum free Silicon to aluminum ratio 420 Resonance frequency variation ⁇ F0 (Hz) 66.3 38.4
- the aluminosilicate-free zeolite particles 1 reduced the resonant frequency F0 of the post-acoustic cavity test tool by 66.3 Hz, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 reduced the resonant frequency F0 by 38.4. It can be seen that the aluminosilicate-free zeolite particles have stronger adsorption-desorption ability to air.
- the aluminosilicate zeolite particles 1 and the aluminosilicate zeolite particles having a ratio of silicon to aluminum of 420 are subjected to an aging test, and the two zeolite particles are respectively placed in a natural environment for a predetermined time, and then the zeolite particles are quantitatively filled into the back cavity.
- the resonance frequency variation ⁇ F0 is tested as shown in the following table:
- the aluminosilicate-free zeolite particles can still reduce the resonance frequency ⁇ F0 of the post-acoustic cavity simulation test tool by 59.3 Hz after being left for 168 hours, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 are placed for 168 hours. Only the resonance frequency ⁇ F0 of the rear cavity simulation test tool can be lowered by 16.3 Hz. It can be seen that the anti-aging properties of the aluminosilicate-free zeolite particles are better.
- the aluminosilicate zeolite particles and the aluminosilicate-free zeolite particles have similar physical properties. From the above comparison, it can be confirmed that since the aluminosilicate-free zeolite particles have different microstructures, the microporous structure and the pore connectivity are better, so that the aluminosilicate-free zeolite particles are adsorbed-desorbed with air molecules. Both ability and anti-aging ability have considerable advantages.
- the fine particles of the zeolitic powder have a first-order pore, and the primary pore has a pore size ranging from 0.3 to 20 nm.
- the first-stage tunnel is used for adsorbing and compressing air.
- the air pressure in the rear sound chamber is increased, and the air in the rear sound chamber can enter the first-level tunnel and be compressed and adsorbed in the first-stage tunnel. In this way, without changing the actual volume of the rear cavity, it is equivalent to increasing the virtual space of the rear cavity, thereby increasing the adsorption amount of the air, thereby reducing the resonance frequency F0 of the speaker.
- the aluminosilicate-free zeolite particles 1 of the present invention are formed by the bonding of the zeolite raw powder particles 11, as shown in Fig. 2, the second layer of pores are formed between the zeolite raw powder particles 11, that is, the aluminosilicate-free zeolite particles. 3.
- the function of the secondary tunnel 3 is to enable the air of the rear sound chamber to smoothly and quickly enter and exit the first-level tunnel, and the secondary tunnel 3 provides a passage for the rapid flow of air. In this way, when the speaker assembly is rapidly vibrated to cause high-frequency changes in the air pressure of the rear sound chamber, the aluminosilicate-free zeolite particles can quickly adsorb and release air, thereby improving the sound response sensitivity of the speaker module.
- the speaker module provided by the invention has a lower resonance frequency and has good response sensitivity to low frequency sound signals. Further, the speaker module of the present invention has a longer service life, and the acoustic performance of the module is attenuated at a slower speed. Under normal use, the speed of the attenuation is an acceptable range.
- the diameter distribution of the first-order pores in the original zeolite powder is concentrated, which is mainly determined by the raw powder synthesis parameters such as temperature, time, and type of template.
- the pore diameter of the secondary channel 3 is mainly affected by the particle size of the zeolite raw powder particles 11, the selection of the binder system, the molding process, and the like.
- the primary channel comprises micropores 21 and/or mesopores 22 having a pore size of less than 2 nm and a pore size of the mesopores 22 ranging from 2 to 20 nm.
- the pore size of the micropores 21 is close to the size of the air molecules.
- the micropores 21 can effectively accommodate air molecules and provide space for compression and adsorption of the air.
- the mesopores 22 provide a smooth flow path for the air in and out of the microholes 21, which in turn can also contain air molecules, providing a space for compressing and adsorbing air.
- the pore size of the micropores 21 is concentrated at 0.4 nm to 0.8 nm, and the pore diameter of the mesopores 22 is concentrated at 2 nm to 10 nm.
- the aluminosilicate-free zeolite particles are capable of minimizing the resonant frequency of the speaker module.
- the pore diameter of the micropores 21 is generally less than 0.4 nm, it is difficult for the nitrogen molecules in the air molecules to enter the micropores 21, or the micropores 21 may be blocked, and the adsorption and compression of the air may not be formed; and when the pore diameter of the micropores 21 is generally larger than At 0.8 nm, an excessively large pore size cannot obtain a large specific surface area, resulting in a decrease in nitrogen adsorption amount, and both of the above conditions degrade the performance of the aluminosilicate-free zeolite particles to lower the resonance frequency.
- a preferred embodiment of the invention is that the pore size of the pores is concentrated between 0.4 nm and 0.8 nm, and the pore size of the mesopores 22 is concentrated between 2 nm and 10 nm.
- the original zeolite powder of the present invention is directly hydrothermally crystallized by a silicon source material and a templating agent.
- Zeolite raw powder particles having a microscopic zeolite structure should be constructed.
- the aluminum element is not introduced into the artificially synthesized zeolite raw powder with respect to the conventional aluminosilicate zeolite.
- other auxiliary materials such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, antimony, bismuth and other doping elements may be added during the hydrothermal crystallization reaction.
- a porous structure is formed.
- the amount and type of the templating agent can also be selected according to the conditions for synthesizing the original zeolite powder.
- the microscopic framework structure of the zeolite raw powder particles also has an effect on the aging resistance and air adsorption-desorption performance of the aluminosilicate-free zeolite particles.
- the zeolite raw powder particles provided by the present invention have an MFI structure, and the aluminosilicate-free zeolite particles formed by the zeolite raw powder particles having the MFI structure can significantly reduce the resonance frequency of the speaker module.
- the aging-free silicate zeolite particles having the MFI structure have better anti-aging properties.
- the MFI structure of the original zeolite particles has a specific three-dimensional skeleton structure at the microscopic level, and the formed pore structure is favorable for the rapid adsorption and desorption of air molecules, so that the resonance frequency effect and the anti-aging ability are well exhibited.
- the pore structure formed by other non-MFI structure of the original zeolite powder is not conducive to rapid desorption of adsorbed air molecules, resulting in blockage of the pores, resulting in aging failure in the natural environment.
- the zeolite particles having the DDR, BEA, and MFI structures are taken as an example for comparison.
- the MFI structure zeolite particles cause the change amount of the resonance frequency of the post-acoustic cavity simulation test tool to be ⁇ F0 in the unaged state.
- the amount of change ⁇ F0 produced by the MFI structure zeolite particles is only reduced by 10%, while the amount of change ⁇ F0 produced by the non-MFI zeolite particles under the same conditions is reduced by 30% to 40%, respectively.
- the zeolite raw powder particles having the MFI structure have better effects in improving the resonance frequency of the speaker module, and are better in anti-natural aging performance.
- the specific surface area of the aluminosilicate-free zeolite particles also has an effect on the properties of its adsorption-desorption air.
- the zeolite particles have a specific surface area in the range of 250 -550m 2 /g. Five kinds of aluminosilicate-free zeolite particles with different specific surface areas and similar physical properties were compared, and the variation ⁇ F0 generated by the above-mentioned resonance frequency of the post-acoustic cavity simulation test tool was used as a standard, as shown in the following table:
- the aluminosilicate-free zeolite particles having a specific surface area of 330-450 m 2 /g have the largest change amount ⁇ F0 of the resonance frequency of the speaker module, and the resonance response frequency decreases more. If the specific surface area of the zeolite particles is large, it means to a large extent that the zeolite particles can adsorb a large amount of air molecules. However, after the specific surface is increased to a specific peak, the pore structure inside the zeolite particles is more complicated and curved, and the gas flow stroke becomes longer.
- the aluminosilicate-free zeolite particles have a specific surface area in the range of from 330 to 450 m 2 /g.
- the aluminosilicate-free zeolite particles of the present invention are formed from zeolite raw powder particles by an adhesive. Zeolite particles have a certain elasticity. When the speaker module is in operation, the resonance response frequency can reach 800-1KHz, which causes high-frequency vibration of the non-foaming sound absorbing material particles and friction between particles, which causes the particles to produce fine powder or even break, which affects the optimization of the acoustic performance of the zeolite module by the zeolite particles. Debugging effect. To a certain extent, the overall strength of the aluminosilicate-free zeolite particles is proportional to the amount of binder.
- the binder may cause clogging of the primary pores of the original zeolite powder, or may have a significant influence on the pore size, pore structure and the like of the micropores, thereby attenuating its adsorption-desorption performance to air.
- the selection and addition amount of the binder system has a significant influence on the anti-aging and anti-pollution properties of the aluminosilicate-free zeolite particles.
- elastomeric zeolite particles have significant advantages in terms of wear resistance and resistance to transient mechanical impact.
- a rigid zeolite particle having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of less than 20 ⁇ m is used for a certain period of time in a speaker module of rated power, and fine particles of zeolite particles appear in the cavity and the zeolite particles are broken.
- the elastic zeolite particles having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of more than 20 ⁇ m do not cause powdering or breaking. Therefore, preferably, the aluminosilicate free of the present invention
- the elastic deformation displacement of the zeolite particles can be greater than 20 microns.
- the mass ratio of the binder ranges from 5 to 15% with respect to the overall mass of the aluminosilicate-free zeolite particles.
- the amount of the binder is within this range, and the zeolite particles can be provided with appropriate rigidity and elasticity without affecting the adsorption performance of the zeolite particles to the air, thereby avoiding the phenomenon that the zeolite particles are powdered and broken during operation.
- the mass ratio of the binder may range from 6 to 10%.
- the particle size of the aluminosilicate-free zeolite particles can be adjusted according to the actual application of the speaker module, and the zeolite particles can also be matched by a reasonable combination of the selection of the binder system and the molding process.
- the internal zeolite raw powder particles form a suitable spacing between them, which in turn allows the zeolite particles to obtain a good ability to rapidly adsorb-desorb air.
- the binder content of the surface layer of the aluminosilicate-free zeolite particles provided by the embodiment of the present invention may be higher than the content of the interior of the particles.
- the carbon C, O O, and Si Si elements on the surface and inside of the two zeolite particles were compared.
- the surface C content is higher than the inner surface
- the surface Si is lower than the inner surface, indicating that the surface adhesive content is higher than the inner portion
- the ratio of the adhesive content of the surface layer of the zeolite particles to the inner layer of the granular particles is higher than 1:1.
- this embodiment can ensure that the surface of the aluminosilicate-free zeolite particles has sufficient particle strength, and does not cause powder or even breakage in the normal operation and drop test of the speaker module.
- the amount of the binder can be controlled to prevent the virtual expansion capacity of the aluminosilicate-free zeolite particles and the attenuation of the resistance to the organic volatile atmosphere due to the excessive amount of the binder.
- Zeolite particles are guaranteed to have good adsorption-desorption properties and aging resistance.
- the particle size of the aluminosilicate-free zeolite particles of the present invention has an effect on the performance of its adsorption-desorption air.
- the particle size ranges from 0.15 to 0.50 mm
- the performance of reducing the resonant frequency in the speaker module is most pronounced.
- the inventors of the present invention found that the reason is that if the particle size of the zeolite particles is small, for example, between 0.05 and 0.10 mm, the zeolite particles are mostly contacted or stacked at a single point or multiple points, and the bulk density is large, and the acoustic resistance is relatively high.
- the structure of the sound absorbing member composed of large, zeolite particles is dense.
- the air cannot be adsorbed or desorbed in the micropores in the center of the zeolite particles during the millisecond pressure change. That is, the adsorption capacity of the zeolite particles to the air molecules cannot be effectively exerted in the process of changing the sound pressure of the speaker module in milliseconds.
- the particle size is too large, such as 0.60-1 mm, the effective mol amount of the granule material per unit volume is less, and the adsorption-desorption ability to air is lowered. Therefore, in a preferred embodiment of the invention, the aluminosilicate-free zeolite particles have an average particle size ranging from 0.05 to 0.50 mm.
- the present invention further has certain requirements on the sphericity of the particles.
- the aluminosilicate-free zeolite particles are spherical, and the spherical aluminosilicate-free zeolite particles having uniform particle diameter can be uniformly filled in the speaker, and the sound absorbing performance is good.
- the aluminosilicate-free zeolite particles may also have an ellipsoidal shape with an aspect ratio of less than 1.5. In this way, the particles can also achieve a uniform, dense filling in the speaker.
- the inventors of the present invention have found that the particle diameter of the zeolite raw powder fine particles for forming the aluminosilicate-free zeolite particles also affects the adsorption-desorption property of the zeolite particles. If the particle size of the zeolite raw powder particles is larger than 5 ⁇ m, the length of the first-order pores formed therein is relatively long, and under the condition of high-frequency operation of the speaker, the air molecules cannot quickly and responsively enter and exit the longer first-order pores, resulting in zeolite. The adsorption-desorption properties of the particles are degraded.
- the zeolite raw powder particles have a particle size ranging from 0.2 to 5 microns, and more preferably, a particle size ranging from 0.3 to 1.5 microns.
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Abstract
A loudspeaker module, comprising a module shell having an accommodation cavity; a loudspeaker assembly arranged inside the accommodation cavity and dividing the accommodation cavity into a rear acoustic cavity and a front sound generating region; and aluminosilicate-free zeolite particles (1) filled in the rear acoustic cavity, the aluminosilicate-free zeolite particles (1) being formed by bonding raw zeolite powder particulates (11) with a binder, wherein the raw zeolite powder particulates (11) have primary pore channels with a pore diameter ranging from 0.3 nm to 20 nm, and in the aluminosilicate-free zeolite particles (1) there are secondary pore channels (3) between the raw zeolite powder particulates (11). Provided is a loudspeaker module having a lower resonant frequency.
Description
本发明属于扬声器技术领域,具体地,本发明涉及一种扬声器模组。The invention belongs to the technical field of loudspeakers, and in particular to a loudspeaker module.
扬声器模组作为一种将电信号转换为声音信号能量转换器,是电声产品中不可或缺的部件。扬声器模组通常由外壳和扬声器单体组成,扬声器单体将模组外壳的内腔分隔成前声腔和后声腔两个腔体。为了改善扬声器模组声学性能(如降低模组的谐振频率F0、扩展带宽),通常会在后声腔内增设吸音件,吸音件会吸收掉部分声能,等效于扩大后腔体容积,从而达到降低模组F0效果。传统的吸音件为发泡类泡棉,如聚氨酯、三聚氰胺等。As an energy converter for converting electrical signals into sound signals, the speaker module is an indispensable component in electro-acoustic products. The speaker module is usually composed of a casing and a speaker unit, and the speaker unit divides the inner cavity of the module casing into two chambers of a front sound chamber and a rear sound chamber. In order to improve the acoustic performance of the speaker module (such as reducing the resonant frequency F0 of the module and expanding the bandwidth), a sound absorbing member is usually added in the rear sound chamber, and the sound absorbing member absorbs part of the sound energy, which is equivalent to expanding the volume of the rear cavity, thereby Achieve the effect of reducing the module F0. Conventional sound absorbing members are foamed foams such as polyurethane, melamine and the like.
近年,在电子产品的日益轻薄化的发展趋势下,作为电子产品重要零部件的扬声器单元不断向结构扁平化的方向发展。但是,扁平结构的微型扬声器模组会造成后声腔的腔体容积缩小,导致扬声器谐振频率F0升高,低频灵敏度降低,对扬声器声学性能造成不利影响。In recent years, under the trend of increasingly thinner and lighter electronic products, speaker units, which are important components of electronic products, have continued to develop in a flattened structure. However, the flat structure of the micro-speaker module will cause the cavity volume of the rear acoustic cavity to shrink, resulting in an increase in the resonant frequency F0 of the speaker, and a decrease in the low-frequency sensitivity, which adversely affects the acoustic performance of the speaker.
为解决扬声器模组轻薄化与声学性能之间的矛盾,本发明的发明人发现,可以将多孔性材料(如活性炭、天然沸石粉、活性二氧化硅、分子筛或按照特定种类和比例而制的混合物等)填充到后声腔内,利用多孔性材料内部特殊物理孔道构造实现对后声腔内气体快速吸附-脱附,达到虚拟增大扬声器后声腔的谐振空间的效果。这种方法可以降低扬声器的谐振频率F0,提高低频声音灵敏度。In order to solve the contradiction between the thinness and the acoustic performance of the speaker module, the inventors of the present invention have found that a porous material (such as activated carbon, natural zeolite powder, active silica, molecular sieve or according to a specific type and ratio) can be used. The mixture is filled into the rear acoustic cavity, and the special physical pore structure inside the porous material is used to realize rapid adsorption-desorption of the gas in the rear acoustic cavity, thereby achieving the effect of virtually increasing the resonance space of the acoustic cavity after the speaker. This method can reduce the resonant frequency F0 of the speaker and improve the sensitivity of the low frequency sound.
发明内容Summary of the invention
本发明的一个目的是提供一种对扬声器模组的谐振频率进行改进的
新技术方案。It is an object of the present invention to provide an improved resonant frequency of a speaker module
New technology solutions.
根据本发明的第一方面,提供了一种扬声器模组,其中包括:According to a first aspect of the present invention, a speaker module is provided, comprising:
模组壳体,所述模组壳体具有容纳腔;a module housing, the module housing having a receiving cavity;
扬声器组件,所述扬声器组件设置在所述容纳腔中,所述扬声器组件将所述容纳腔分割为后声腔和前出声区;a speaker assembly disposed in the accommodating cavity, the speaker assembly dividing the accommodating cavity into a rear acoustic cavity and a front sounding zone;
填充在所述后声腔内的无铝硅酸盐沸石颗粒,所述无铝硅酸盐沸石颗粒由沸石原粉微粒经粘接剂粘接构成;Filling the aluminosilicate-free zeolite particles in the rear acoustic cavity, the aluminosilicate-free zeolite particles being composed of the zeolite raw powder particles bonded by an adhesive;
其中,所述沸石原粉微粒具有一级孔道,所述一级孔道的孔径范围为0.3-20nm,在所述无铝硅酸盐沸石颗粒中,所述沸石原粉微粒之间具有二级孔道。Wherein the zeolite raw powder particles have a first-order pore having a pore diameter ranging from 0.3 to 20 nm, and in the aluminosilicate-free zeolite particles, the zeolite raw powder particles have a second-order pore between them .
可选地,所述一级孔道包括微孔和/或介孔,所述微孔的孔径小于2nm,所述介孔的孔径范围为2-20nm。更优地,所述微孔的孔径范围为0.4-0.8nm,所述介孔的孔径范围为2-10nm。Optionally, the primary channel comprises micropores and/or mesopores, the micropores having a pore size of less than 2 nm, and the mesopores having a pore size ranging from 2 to 20 nm. More preferably, the pores have a pore size ranging from 0.4 to 0.8 nm, and the mesopores have a pore size ranging from 2 to 10 nm.
可选地,所述沸石原粉微粒由硅源材料、模板剂以及辅料经水热晶化反应制成。Optionally, the zeolite raw powder particles are prepared by hydrothermal crystallization of a silicon source material, a templating agent, and an auxiliary material.
可选地,所述沸石原粉微粒为MFI沸石结构。Optionally, the zeolite raw powder particles are of an MFI zeolite structure.
可选地,所述无铝硅酸盐沸石颗粒的比表面积范围为250-550m2/g。Optionally, the aluminosilicate-free zeolite particles have a specific surface area ranging from 250 to 550 m 2 /g.
可选地,所述无铝硅酸盐沸石颗粒的表面层粘接剂含量高于内部粘接剂含量。Optionally, the aluminosilicate-free zeolite particles have a surface layer binder content higher than the internal binder content.
可选地,所述无铝硅酸盐沸石颗粒呈球形或椭球形,无铝硅酸盐沸石颗粒的长宽比小于1.5,粒径范围为0.05-0.50mm。Optionally, the aluminosilicate-free zeolite particles are spherical or ellipsoidal, and the aluminosilicate-free zeolite particles have an aspect ratio of less than 1.5 and a particle size ranging from 0.05 to 0.50 mm.
可选地,所述无铝硅酸盐沸石颗粒的弹性形变位移量大于20微米。Optionally, the aluminosilicate-free zeolite particles have an elastic deformation displacement greater than 20 microns.
可选地,所述沸石原粉微粒的粒径范围为0.2-5微米。Optionally, the virgin powder particles have a particle size ranging from 0.2 to 5 microns.
可选地,所述粘接剂在所述无铝硅酸盐沸石颗粒中的质量比例范围为5-15%。Optionally, the mass ratio of the binder in the aluminosilicate-free zeolite particles ranges from 5 to 15%.
可选地,所述无铝硅酸盐沸石颗粒中含有掺杂元素,所述掺杂元素包括硼、铁、钛、钾、钙、锡、铯、锗中的至少一种。Optionally, the aluminosilicate-free zeolite particles contain a doping element, and the doping element includes at least one of boron, iron, titanium, potassium, calcium, tin, antimony, and cerium.
本发明的发明人发现,在现有技术中,新型非发泡的多孔吸音材料
具有比传统吸音材料更好的吸音效果,本领域技术人员普遍对这种新型非发泡吸音材料的性能有很高的认可度。所以,在需要进一步降低扬声器谐振频率的情况下,本领域技术人员会选择改进扬声器结构的技术手段。而不会考虑到对非发泡吸音材料的声学性能作出进一步研究和改进。因此,本发明所要实现的技术任务或者所要解决的技术问题是本领域技术人员从未想到的或者没有预期到的,故本发明是一种新的技术方案。The inventors of the present invention have found that in the prior art, a novel non-foamed porous sound absorbing material
It has a better sound absorbing effect than the conventional sound absorbing material, and the performance of the new non-foaming sound absorbing material is generally recognized by those skilled in the art. Therefore, in the case where it is required to further reduce the resonance frequency of the speaker, those skilled in the art will select a technical means for improving the structure of the speaker. Further research and improvement on the acoustic properties of non-foamed sound absorbing materials will not be considered. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.
通过以下参照附图对本发明的示例性实施例的详细描述,本发明的其它特征及其优点将会变得清楚。Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实施例,并且连同其说明一起用于解释本发明的原理。The accompanying drawings, which are incorporated in FIG
图1是本发明提供的无铝硅酸盐沸石颗粒示意图;Figure 1 is a schematic view of the aluminosilicate-free zeolite particles provided by the present invention;
图2是本发明提供的无铝硅酸盐沸石颗粒微观示意图;2 is a microscopic schematic view of the aluminosilicate-free zeolite particles provided by the present invention;
图3是不同结构的沸石颗粒的抗老化性能曲线图;Figure 3 is a graph showing the anti-aging performance of zeolite particles of different structures;
图4是本发明提供的无铝硅酸盐沸石颗粒内部组分对比图。Figure 4 is a graph showing the internal composition of the aluminosilicate-free zeolite particles provided by the present invention.
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到:除非另外具体说明,否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention unless otherwise specified.
以下对至少一个示例性实施例的描述实际上仅仅是说明性的,决不作为对本发明及其应用或使用的任何限制。The following description of the at least one exemplary embodiment is merely illustrative and is in no way
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论,但在适当情况下,所述技术、方法和设备应当被视为说明书的一部分。Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but the techniques, methods and apparatus should be considered as part of the specification, where appropriate.
在这里示出和讨论的所有例子中,任何具体值应被解释为仅仅是示例性的,而不是作为限制。因此,示例性实施例的其它例子可以具有不同
的值。In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Therefore, other examples of the exemplary embodiments may have different
Value.
应注意到:相似的标号和字母在下面的附图中表示类似项,因此,一旦某一项在一个附图中被定义,则在随后的附图中不需要对其进行进一步讨论。It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.
本发明提供了一种扬声器模组,该扬声器模组中包括模组壳体、扬声器组件以及无铝硅酸盐沸石颗粒。所述模组壳体中具有容纳腔,所述扬声器组件设置在所述容纳腔中。所述扬声器组件通常包括振动组件、磁路组件等,扬声器组件会将所述容纳腔分割成前出声区和后声腔。振动组件根据接收的声音信号产生振动进而发出声音,声音从所述前出声区传播到扬声器模组之外。从振动组件传播到后声腔的声音会被后声腔吸收。如图1所示的无铝硅酸盐沸石颗粒1填充在所述后声腔中,用于吸附后声腔中的空气,无铝硅酸盐沸石颗粒1由沸石原粉微粒经粘接剂粘接形成。The invention provides a speaker module, which comprises a module housing, a speaker assembly and aluminosilicate-free zeolite particles. The module housing has a receiving cavity therein, and the speaker assembly is disposed in the receiving cavity. The speaker assembly typically includes a vibrating assembly, a magnetic circuit assembly, etc., and the speaker assembly divides the receiving chamber into a front sounding zone and a rear sounding cavity. The vibration component generates vibration according to the received sound signal to emit a sound, and the sound propagates from the front sounding area to the outside of the speaker module. The sound that propagates from the vibrating assembly to the rear chamber is absorbed by the rear chamber. The aluminosilicate-free zeolite particles 1 shown in Fig. 1 are filled in the rear acoustic chamber for adsorbing the air in the acoustic chamber, and the aluminosilicate-free zeolite particles 1 are bonded by the zeolite raw powder particles through an adhesive. form.
本发明所述无铝硅酸盐沸石颗粒1是指沸石颗粒和沸石原粉微粒中不含有铝元素。以原子吸收光谱或者原子荧光光谱等检测方法均检测为无铝元素。所述无铝硅酸盐沸石颗粒1或沸石原粉微粒中可以存在用于对沸石材料进行表面修饰和改性的掺杂元素,如稀土元素、硼、铁、钛、钾、钙、锡、铯、锗等。The aluminosilicate-free zeolite particles 1 of the present invention means that the zeolite particles and the zeolite raw powder particles do not contain aluminum. It is detected as an aluminum-free element by atomic absorption spectroscopy or atomic fluorescence spectroscopy. Doping elements such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, etc. may be present in the aluminosilicate-free zeolite particles 1 or the zeolite raw powder particles for surface modification and modification of the zeolitic material.铯, 锗, etc.
所述无铝硅酸盐沸石颗粒1与硅铝比为420的硅铝酸盐沸石颗粒相比,在气压波动作用下吸附-脱附空气分子方面,以及在抗老化能力方面都有明显的提升。以一种后声腔模拟测试工装作为基准,填入定量0.15g的所述无铝硅酸盐沸石颗粒1或硅铝比420的硅铝酸盐沸石颗粒进行对比,如下表所示:The aluminosilicate-free zeolite particles 1 have a significant improvement in adsorption-desorption of air molecules and anti-aging ability in comparison with aluminosilicate zeolite particles having a silicon to aluminum ratio of 420. . Using a post-acoustic cavity simulation test tool as a reference, a quantity of 0.15 g of the aluminosilicate-free zeolite particles 1 or aluminosilicate 420 particles of aluminosilicate ratio of 420 was filled in, as shown in the following table:
硅酸盐沸石颗粒样品Silicate zeolite particle sample | 无铝Aluminum free | 硅铝比420Silicon to aluminum ratio 420 |
谐振频率变化量△F0(Hz)Resonance frequency variation △F0 (Hz) | 66.366.3 | 38.438.4 |
所述无铝硅酸盐沸石颗粒1使后声腔测试工装的谐振频率F0降低了66.3Hz,而硅铝比420的硅铝酸盐沸石颗粒使谐振频率F0下降了38.4。可见无铝硅酸盐沸石颗粒对空气的吸附-脱附能力更强。
The aluminosilicate-free zeolite particles 1 reduced the resonant frequency F0 of the post-acoustic cavity test tool by 66.3 Hz, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 reduced the resonant frequency F0 by 38.4. It can be seen that the aluminosilicate-free zeolite particles have stronger adsorption-desorption ability to air.
对所述无铝硅酸盐沸石颗粒1和硅铝比420的硅铝酸盐沸石颗粒进行老化测试,分别将两种沸石颗粒在自然环境下放置预定时间,再将沸石颗粒定量填入后声腔模拟测试工装中,对谐振频率变化量△F0进行测试,如下表所示:The aluminosilicate zeolite particles 1 and the aluminosilicate zeolite particles having a ratio of silicon to aluminum of 420 are subjected to an aging test, and the two zeolite particles are respectively placed in a natural environment for a predetermined time, and then the zeolite particles are quantitatively filled into the back cavity. In the simulation test tooling, the resonance frequency variation ΔF0 is tested as shown in the following table:
硅酸盐沸石颗粒样品Silicate |
00 |
24h | 48h48h | 96h96h | 120h120h | 144h144h | 168h168h | |
无铝Aluminum free | 66.566.5 | 67.167.1 | 63.163.1 | 61.961.9 | 60.160.1 | 59.859.8 | 59.359.3 | |
硅铝比:420Silicon to aluminum ratio: 420 | 37.937.9 | 32.132.1 | 30.430.4 | 26.426.4 | 21.421.4 | 18.618.6 | 16.316.3 |
所述无铝硅酸盐沸石颗粒在放置了168小时后仍可以使后声腔模拟测试工装的谐振频率△F0下降59.3Hz,而硅铝比420的硅铝酸盐沸石颗粒在放置了168小时后仅能使后声腔模拟测试工装的谐振频率△F0下降16.3Hz。可见,无铝硅酸盐沸石颗粒的抗老化性能更好。The aluminosilicate-free zeolite particles can still reduce the resonance frequency ΔF0 of the post-acoustic cavity simulation test tool by 59.3 Hz after being left for 168 hours, while the aluminosilicate zeolite particles of the silicon-aluminum ratio of 420 are placed for 168 hours. Only the resonance frequency ΔF0 of the rear cavity simulation test tool can be lowered by 16.3 Hz. It can be seen that the anti-aging properties of the aluminosilicate-free zeolite particles are better.
在这种测试中,硅铝酸盐沸石颗粒和所述无铝硅酸盐沸石颗粒的其它物性相近。从上述对比中可以确定,由于无铝硅酸盐沸石颗粒搭建微观结构的元素不同,对应其微观孔道结构和孔道连通性更好,所以无铝硅酸盐沸石颗粒的吸附-脱附空气分子的能力和抗老化能力都具有相当优势。In this test, the aluminosilicate zeolite particles and the aluminosilicate-free zeolite particles have similar physical properties. From the above comparison, it can be confirmed that since the aluminosilicate-free zeolite particles have different microstructures, the microporous structure and the pore connectivity are better, so that the aluminosilicate-free zeolite particles are adsorbed-desorbed with air molecules. Both ability and anti-aging ability have considerable advantages.
特别地,沸石原粉的微粒中具一级孔道,一级孔道的孔径范围为0.3-20nm。所述一级孔道用于吸附、压缩空气,当扬声器组件的振膜振动时会使后声腔中的气压增大,后声腔的空气可以进入一级孔道并在一级孔道内被压缩、吸附。这样,在不改变后声腔实际容纳体积的情况下,相当于增大了后声腔的虚拟空间,提高了空气的吸附量,进而降低了扬声器的谐振频率F0。本发明所述无铝硅酸盐沸石颗粒1通过沸石原粉微粒11粘接形成,如图2所示,沸石原粉微粒11之间,也即无铝硅酸盐沸石颗粒中具有二级孔道3。所述二级孔道3的作用在于使后声腔的空气能够顺畅、快速的进出一级孔道,二级孔道3为空气快速流动提供了通路。这样,当扬声器组件发生快速振动使后声腔的气压产生高频变化时,无铝硅酸盐沸石颗粒能够快速的吸附、放出空气,提高了扬声器模组的声音响应灵敏度。
In particular, the fine particles of the zeolitic powder have a first-order pore, and the primary pore has a pore size ranging from 0.3 to 20 nm. The first-stage tunnel is used for adsorbing and compressing air. When the diaphragm of the speaker assembly vibrates, the air pressure in the rear sound chamber is increased, and the air in the rear sound chamber can enter the first-level tunnel and be compressed and adsorbed in the first-stage tunnel. In this way, without changing the actual volume of the rear cavity, it is equivalent to increasing the virtual space of the rear cavity, thereby increasing the adsorption amount of the air, thereby reducing the resonance frequency F0 of the speaker. The aluminosilicate-free zeolite particles 1 of the present invention are formed by the bonding of the zeolite raw powder particles 11, as shown in Fig. 2, the second layer of pores are formed between the zeolite raw powder particles 11, that is, the aluminosilicate-free zeolite particles. 3. The function of the secondary tunnel 3 is to enable the air of the rear sound chamber to smoothly and quickly enter and exit the first-level tunnel, and the secondary tunnel 3 provides a passage for the rapid flow of air. In this way, when the speaker assembly is rapidly vibrated to cause high-frequency changes in the air pressure of the rear sound chamber, the aluminosilicate-free zeolite particles can quickly adsorb and release air, thereby improving the sound response sensitivity of the speaker module.
本发明提供的扬声器模组具有更低的谐振频率,对低频声音信号具有良好的响应灵敏度。进一步地,本发明的扬声器模组使用寿命更长,模组的声学性能衰减失效的速度缓慢,在正常使用情况下,衰减的速度是可以接受的范围。The speaker module provided by the invention has a lower resonance frequency and has good response sensitivity to low frequency sound signals. Further, the speaker module of the present invention has a longer service life, and the acoustic performance of the module is attenuated at a slower speed. Under normal use, the speed of the attenuation is an acceptable range.
沸石原粉中的一级孔道孔直径分布较为集中,主要由原粉合成参数,例如温度、时间、模板剂种类等设定所决定的。二级孔道3的孔直径主要受到沸石原粉微粒11的粒径大小、粘接剂体系选型、成型工艺等的影响。优选地,如图2所示,所述一级孔道包括微孔21和/或介孔22,所述微孔21的孔径小于2nm,所述介孔22的孔径范围为2-20nm。微孔21的孔径接近空气分子的大小,当后声腔气压增大时,微孔21能够有效的容纳空气分子,为空气提供压缩、吸附的空间。介孔22为空气进出微孔21提供了顺畅的流通通道,介孔22同时也可以容纳空气分子,提供压缩和吸附空气的空间。The diameter distribution of the first-order pores in the original zeolite powder is concentrated, which is mainly determined by the raw powder synthesis parameters such as temperature, time, and type of template. The pore diameter of the secondary channel 3 is mainly affected by the particle size of the zeolite raw powder particles 11, the selection of the binder system, the molding process, and the like. Preferably, as shown in FIG. 2, the primary channel comprises micropores 21 and/or mesopores 22 having a pore size of less than 2 nm and a pore size of the mesopores 22 ranging from 2 to 20 nm. The pore size of the micropores 21 is close to the size of the air molecules. When the pressure of the rear acoustic chamber is increased, the micropores 21 can effectively accommodate air molecules and provide space for compression and adsorption of the air. The mesopores 22 provide a smooth flow path for the air in and out of the microholes 21, which in turn can also contain air molecules, providing a space for compressing and adsorbing air.
更优地,微孔21的孔径范围集中在0.4nm-0.8nm,介孔22的孔径范围集中在2nm-10nm。在这种情况下,无铝硅酸盐沸石颗粒能够最大程度的降低所述扬声器模组的谐振频率。如果微孔21的孔径普遍小于0.4nm,则空气分子中的氮气分子难以进入所述微孔21,或者会堵塞微孔21,不能形成空气的吸附和压缩;而当微孔21的孔径普遍大于0.8nm时,过大的孔径无法获得较大的比表面积,导致氮气吸附量减少,以上两种情况都使无铝硅酸盐沸石颗粒降低谐振频率的性能下降。对于所述介孔22的孔径,如果介孔22孔径小于2nm,所述介孔22会对所述微孔21的结构造成较强破坏,导致沸石原粉微粒11的结构不稳定而难以形成无铝硅酸盐沸石颗粒;当所述介孔22的孔径普遍大于10nm时,过大的介孔22无法有效连通所有的微孔21,气体分子在微孔21中吸附和脱附的作用会受到一定阻力,从而导致无铝硅酸盐沸石颗粒降低谐振频率的性能下降。所以,本发明一种优选的实施方式是,孔的孔径范围集中在0.4nm-0.8nm,介孔22的孔径范围集中在2nm-10nm。More preferably, the pore size of the micropores 21 is concentrated at 0.4 nm to 0.8 nm, and the pore diameter of the mesopores 22 is concentrated at 2 nm to 10 nm. In this case, the aluminosilicate-free zeolite particles are capable of minimizing the resonant frequency of the speaker module. If the pore diameter of the micropores 21 is generally less than 0.4 nm, it is difficult for the nitrogen molecules in the air molecules to enter the micropores 21, or the micropores 21 may be blocked, and the adsorption and compression of the air may not be formed; and when the pore diameter of the micropores 21 is generally larger than At 0.8 nm, an excessively large pore size cannot obtain a large specific surface area, resulting in a decrease in nitrogen adsorption amount, and both of the above conditions degrade the performance of the aluminosilicate-free zeolite particles to lower the resonance frequency. For the pore size of the mesopores 22, if the pore size of the mesopores 22 is less than 2 nm, the mesopores 22 cause a strong damage to the structure of the micropores 21, resulting in unstable structure of the zeolite raw powder particles 11 and difficulty in forming no The aluminosilicate zeolite particles; when the pore diameter of the mesopores 22 is generally greater than 10 nm, the excessive mesopores 22 cannot effectively communicate with all the micropores 21, and the adsorption and desorption of gas molecules in the micropores 21 are affected. Certain resistance, resulting in a decrease in the performance of the aluminosilicate-free zeolite particles to reduce the resonant frequency. Therefore, a preferred embodiment of the invention is that the pore size of the pores is concentrated between 0.4 nm and 0.8 nm, and the pore size of the mesopores 22 is concentrated between 2 nm and 10 nm.
本发明所述的沸石原粉是直接由硅源材料和模板剂经过水热晶化反
应构成的具有微观沸石结构的沸石原粉微粒。相对于传统的硅铝酸盐沸石,人工合成的所述沸石原粉中不会引入铝元素。为了能够形成良好的多孔微观结构,在进行水热晶化反应时可以增加其它辅料,例如具有稀土元素、硼、铁、钛、钾、钙、锡、铯、锗等掺杂元素的辅料,辅助形成多孔结构。所述模板剂的用量和种类也可以根据合成沸石原粉的条件进行选择。The original zeolite powder of the present invention is directly hydrothermally crystallized by a silicon source material and a templating agent.
Zeolite raw powder particles having a microscopic zeolite structure should be constructed. The aluminum element is not introduced into the artificially synthesized zeolite raw powder with respect to the conventional aluminosilicate zeolite. In order to form a good porous microstructure, other auxiliary materials such as rare earth elements, boron, iron, titanium, potassium, calcium, tin, antimony, bismuth and other doping elements may be added during the hydrothermal crystallization reaction. A porous structure is formed. The amount and type of the templating agent can also be selected according to the conditions for synthesizing the original zeolite powder.
另外,沸石原粉微粒的微观框架结构对无铝硅酸盐沸石颗粒的抗老化性和空气吸附-脱附性能也有影响。优选地,本发明提供的沸石原粉微粒具有MFI结构,具有MFI结构的沸石原粉微粒形成的无铝硅酸盐沸石颗粒能够使扬声器模组的谐振频率明显下降。另一方面,具有MFI结构的无虑硅酸盐沸石颗粒的抗老化性能更好。MFI结构的沸石原粉微粒在微观上具有特定的三维骨架结构,所形成的孔道结构,有利于空气分子的快速吸附脱附,所以表现出良好的降低谐振频率效果及抗老化能力。其他非MFI结构的沸石原粉所形成的孔道结构不利于吸附的空气分子快速脱附,造成孔道堵塞,导致在自然环境下老化失效。In addition, the microscopic framework structure of the zeolite raw powder particles also has an effect on the aging resistance and air adsorption-desorption performance of the aluminosilicate-free zeolite particles. Preferably, the zeolite raw powder particles provided by the present invention have an MFI structure, and the aluminosilicate-free zeolite particles formed by the zeolite raw powder particles having the MFI structure can significantly reduce the resonance frequency of the speaker module. On the other hand, the aging-free silicate zeolite particles having the MFI structure have better anti-aging properties. The MFI structure of the original zeolite particles has a specific three-dimensional skeleton structure at the microscopic level, and the formed pore structure is favorable for the rapid adsorption and desorption of air molecules, so that the resonance frequency effect and the anti-aging ability are well exhibited. The pore structure formed by other non-MFI structure of the original zeolite powder is not conducive to rapid desorption of adsorbed air molecules, resulting in blockage of the pores, resulting in aging failure in the natural environment.
如图3所示,以具有DDR、BEA以及MFI结构的沸石颗粒为例进行对比,可以得知,未老化状态下,MFI结构沸石颗粒使后声腔模拟测试工装的谐振频率产生的变化量△F0最高,且自然环境下放置288小时后,MFI结构沸石颗粒产生的变化量△F0只减小10%,而相同条件下非MFI沸石颗粒产生的变化量△F0分别减小了30%到40%。可见,具有MFI结构的沸石原粉微粒在改善扬声器模组谐振频率方面具有更好的效果,并且在抗自然老化性能更好。As shown in FIG. 3, the zeolite particles having the DDR, BEA, and MFI structures are taken as an example for comparison. It can be seen that the MFI structure zeolite particles cause the change amount of the resonance frequency of the post-acoustic cavity simulation test tool to be ΔF0 in the unaged state. The highest, and after 288 hours of natural environment, the amount of change ΔF0 produced by the MFI structure zeolite particles is only reduced by 10%, while the amount of change ΔF0 produced by the non-MFI zeolite particles under the same conditions is reduced by 30% to 40%, respectively. . It can be seen that the zeolite raw powder particles having the MFI structure have better effects in improving the resonance frequency of the speaker module, and are better in anti-natural aging performance.
所述无铝硅酸盐沸石颗粒的比表面积也会对其吸附-脱附空气的性能产生影响,可选地,在本发明的一种实施方式中,所述沸石颗粒的比表面积范围为250-550m2/g。以五种比表面积不同、其它物性相近的无铝硅酸盐沸石颗粒进行比较,以上述对后声腔模拟测试工装的谐振频率产生的变化量△F0作为标准,如下表所示:The specific surface area of the aluminosilicate-free zeolite particles also has an effect on the properties of its adsorption-desorption air. Alternatively, in one embodiment of the invention, the zeolite particles have a specific surface area in the range of 250 -550m 2 /g. Five kinds of aluminosilicate-free zeolite particles with different specific surface areas and similar physical properties were compared, and the variation ΔF0 generated by the above-mentioned resonance frequency of the post-acoustic cavity simulation test tool was used as a standard, as shown in the following table:
BET多点法比表面积/m2/gBET multi-point method specific surface area / m 2 /g | 215215 | 330330 | 390390 | 457457 | 689689 |
△F0/Hz△F0/Hz | 3535 | 8383 | 121121 | 104104 | 5757 |
从对比结果可知,比表面积范围在330-450m2/g的无铝硅酸盐沸石颗粒对扬声器模组的谐振频率产生的变化量△F0最大,谐振响应频率降低值较多。如果沸石颗粒的比表面积较大,在很大程度上意味着该沸石颗粒可吸附空气分子的量大。但比表面增大至特定峰值后,沸石颗粒内部的孔道结构更为弯曲复杂,气流行程变长。扬声器模组工作产生声压变化时,在毫秒级的声压变化过程中,空气分子无法快速穿过长度过长且弯曲复杂的孔道,即沸石颗粒无法实现对空气分子的快速吸附-脱附作用。所以,导致比表面积过大的沸石颗粒无法有效降低扬声器模组的谐振频率。更优地,在本发明的优选实施方式中,所述无铝硅酸盐沸石颗粒的比表面积范围在330-450m2/g。It can be seen from the comparison results that the aluminosilicate-free zeolite particles having a specific surface area of 330-450 m 2 /g have the largest change amount ΔF0 of the resonance frequency of the speaker module, and the resonance response frequency decreases more. If the specific surface area of the zeolite particles is large, it means to a large extent that the zeolite particles can adsorb a large amount of air molecules. However, after the specific surface is increased to a specific peak, the pore structure inside the zeolite particles is more complicated and curved, and the gas flow stroke becomes longer. When the sound intensity of the speaker module is changed, during the millisecond sound pressure change, the air molecules cannot pass through the long and long curved channels, that is, the zeolite particles cannot achieve rapid adsorption-desorption of air molecules. . Therefore, the zeolite particles which cause excessive specific surface area cannot effectively reduce the resonance frequency of the speaker module. More preferably, in a preferred embodiment of the invention, the aluminosilicate-free zeolite particles have a specific surface area in the range of from 330 to 450 m 2 /g.
本发明所述无铝硅酸盐沸石颗粒由沸石原粉微粒通过粘接剂成型。沸石颗粒具备一定的弹性。扬声器模组在运作时,共振响应频率可达800-1KHz,造成非发泡吸音材料颗粒的高频振动以及颗粒间摩擦,使颗粒产生微粉甚至破碎,影响沸石颗粒对扬声器模组声学性能的优化调试效果。在一定程度上,无铝硅酸盐沸石颗粒的整体强度与粘接剂的用量成正比,粘接剂用量越大,颗粒强度越高,在扬声器模组长时间高频运作和耐机械跌落测试中表现越佳。但粘接剂会对所述沸石原粉的一级孔道造成堵塞,或者对所述微孔的孔径大小、孔道结构等产生显著影响,进而衰减其对空气的吸附-脱附性能。而且,粘接剂体系的选型和添加量多少,对无铝硅酸盐沸石颗粒的抗老化和抗污染性能有较为明显的影响。The aluminosilicate-free zeolite particles of the present invention are formed from zeolite raw powder particles by an adhesive. Zeolite particles have a certain elasticity. When the speaker module is in operation, the resonance response frequency can reach 800-1KHz, which causes high-frequency vibration of the non-foaming sound absorbing material particles and friction between particles, which causes the particles to produce fine powder or even break, which affects the optimization of the acoustic performance of the zeolite module by the zeolite particles. Debugging effect. To a certain extent, the overall strength of the aluminosilicate-free zeolite particles is proportional to the amount of binder. The higher the amount of binder, the higher the particle strength, the long-term high-frequency operation and mechanical drop resistance test in the speaker module. The better the performance. However, the binder may cause clogging of the primary pores of the original zeolite powder, or may have a significant influence on the pore size, pore structure and the like of the micropores, thereby attenuating its adsorption-desorption performance to air. Moreover, the selection and addition amount of the binder system has a significant influence on the anti-aging and anti-pollution properties of the aluminosilicate-free zeolite particles.
弹性沸石颗粒与刚性沸石颗粒相比,其在耐磨性及抗瞬时机械冲击力的能力具有明显优势。以粒径在0.25-0.35mm之间、弹性形变位移小于20μm的刚性沸石颗粒为例,在额定功率的扬声器模组中工作一定时间,腔体内会出现沸石颗粒的微粉并且有沸石颗粒破碎现象。相同条件下,具有粒径在0.25-0.35mm之间、弹性形变位移大于20微米的弹性沸石颗粒不会出现起粉、破碎的现象发生。所以,优选地,本发明所述无铝硅酸盐
沸石颗粒的弹性形变位移量可以大于20微米。Compared to rigid zeolite particles, elastomeric zeolite particles have significant advantages in terms of wear resistance and resistance to transient mechanical impact. For example, a rigid zeolite particle having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of less than 20 μm is used for a certain period of time in a speaker module of rated power, and fine particles of zeolite particles appear in the cavity and the zeolite particles are broken. Under the same conditions, the elastic zeolite particles having a particle diameter of 0.25-0.35 mm and an elastic deformation displacement of more than 20 μm do not cause powdering or breaking. Therefore, preferably, the aluminosilicate free of the present invention
The elastic deformation displacement of the zeolite particles can be greater than 20 microns.
进一步地,相对于所述无铝硅酸盐沸石颗粒的整体质量,所述粘接剂的质量比例范围为5-15%。粘接剂的用量在该范围内,能够在不影响沸石颗粒对空气的吸附性能的情况下,为沸石颗粒整体提供适当的刚性和弹性,避免沸石颗粒在工作中出现起粉、破碎的现象。更优地,所述粘接剂的质量比例范围可以为6-10%。Further, the mass ratio of the binder ranges from 5 to 15% with respect to the overall mass of the aluminosilicate-free zeolite particles. The amount of the binder is within this range, and the zeolite particles can be provided with appropriate rigidity and elasticity without affecting the adsorption performance of the zeolite particles to the air, thereby avoiding the phenomenon that the zeolite particles are powdered and broken during operation. More preferably, the mass ratio of the binder may range from 6 to 10%.
特别地,可以根据扬声器模组的实际应用情况调整所述无铝硅酸盐沸石颗粒的粒径大小,也可以通过对粘接剂体系的选型、成型工艺等条件的合理搭配,使得沸石颗粒内部的沸石原粉微粒之间形成合适的间距,进而使沸石颗粒获得良好的快速吸附-脱附空气的能力。优选地,为了平衡沸石颗粒的吸附-脱附能力和结构稳定性,本发明具体实施方式提供的无铝硅酸盐沸石颗粒表层的粘接剂含量可以高于颗粒内部的含量。In particular, the particle size of the aluminosilicate-free zeolite particles can be adjusted according to the actual application of the speaker module, and the zeolite particles can also be matched by a reasonable combination of the selection of the binder system and the molding process. The internal zeolite raw powder particles form a suitable spacing between them, which in turn allows the zeolite particles to obtain a good ability to rapidly adsorb-desorb air. Preferably, in order to balance the adsorption-desorption ability and structural stability of the zeolite particles, the binder content of the surface layer of the aluminosilicate-free zeolite particles provided by the embodiment of the present invention may be higher than the content of the interior of the particles.
参照图4所示,对两种沸石颗粒表面和内部的碳C、氧O、硅Si元素进行对比。其中表面C含量高于内部,表面Si低于内部,说明表面粘接剂含量高于内部,沸石颗粒表层的粘接剂含量与颗粒内层比值高于1:1。这种实施方式一方面可以保证该无铝硅酸盐沸石颗粒表面具有足够的颗粒强度,不会在扬声器模组正常运作和跌落测试中起粉、甚至破碎。另一方面可以控制粘接剂的用量,防止因粘接剂的用量过多造成无铝硅酸盐沸石颗粒的虚拟扩容能力和抗有机挥发气氛污染能力的衰减。保证沸石颗粒具有良好的吸附-脱附性能和抗老化性。Referring to Figure 4, the carbon C, O O, and Si Si elements on the surface and inside of the two zeolite particles were compared. The surface C content is higher than the inner surface, and the surface Si is lower than the inner surface, indicating that the surface adhesive content is higher than the inner portion, and the ratio of the adhesive content of the surface layer of the zeolite particles to the inner layer of the granular particles is higher than 1:1. On the one hand, this embodiment can ensure that the surface of the aluminosilicate-free zeolite particles has sufficient particle strength, and does not cause powder or even breakage in the normal operation and drop test of the speaker module. On the other hand, the amount of the binder can be controlled to prevent the virtual expansion capacity of the aluminosilicate-free zeolite particles and the attenuation of the resistance to the organic volatile atmosphere due to the excessive amount of the binder. Zeolite particles are guaranteed to have good adsorption-desorption properties and aging resistance.
本发明所述无铝硅酸盐沸石颗粒的粒径对其吸附-脱附空气的性能有所影响。优选地,当颗粒的粒径范围在0.15-0.50mm之间时,其在扬声器模组中降低谐振频率的性能最明显。本发明的发明人发现其原因在于,如果沸石颗粒粒径较小,例如在0.05-0.10mm之间,沸石颗粒之间多以单点或多点接触、堆砌,堆积密度较大,声阻较大,沸石颗粒构成的吸音件结构偏致密。扬声器模组工作产生声压变化时,空气无法在毫秒级的声压变化过程中,吸附或脱附于沸石颗粒中心的微孔中。即沸石颗粒对空气分子的吸附能力无法在扬声器模组毫秒级的声压变化过程中有效的发挥。相
反的,如果颗粒粒径偏大,如0.60-1mm,则单位体积的沸石材料颗粒的有效mol量偏少,对空气的吸附-脱附能力有所降低。所以,在本发明的一种优选的实施方式中,所述无铝硅酸盐沸石颗粒的平均粒径范围在0.05-0.50mm之间。The particle size of the aluminosilicate-free zeolite particles of the present invention has an effect on the performance of its adsorption-desorption air. Preferably, when the particle size ranges from 0.15 to 0.50 mm, the performance of reducing the resonant frequency in the speaker module is most pronounced. The inventors of the present invention found that the reason is that if the particle size of the zeolite particles is small, for example, between 0.05 and 0.10 mm, the zeolite particles are mostly contacted or stacked at a single point or multiple points, and the bulk density is large, and the acoustic resistance is relatively high. The structure of the sound absorbing member composed of large, zeolite particles is dense. When the sound intensity of the speaker module changes, the air cannot be adsorbed or desorbed in the micropores in the center of the zeolite particles during the millisecond pressure change. That is, the adsorption capacity of the zeolite particles to the air molecules cannot be effectively exerted in the process of changing the sound pressure of the speaker module in milliseconds. Phase
Conversely, if the particle size is too large, such as 0.60-1 mm, the effective mol amount of the granule material per unit volume is less, and the adsorption-desorption ability to air is lowered. Therefore, in a preferred embodiment of the invention, the aluminosilicate-free zeolite particles have an average particle size ranging from 0.05 to 0.50 mm.
另外,为了保证所述无铝硅酸盐沸石颗粒的性能,本发明进一步对颗粒的球形度有一定要求。优选地,所述无铝硅酸盐沸石颗粒呈球形,粒径统一的球形无铝硅酸盐沸石颗粒能够均匀的填充在扬声器中,吸音性能良好。或者可选地,所述无铝硅酸盐沸石颗粒也可以呈椭球形,其长宽比应小于1.5。这样,颗粒在扬声器中也能够实现均匀、密实的填充。但如果长宽比过大,或者颗粒整体形状不规则,会影响颗粒内部的孔道结构,所以,为获得更好的技术效果,需保证颗粒具有一定程度的球形度。In addition, in order to ensure the properties of the aluminosilicate-free zeolite particles, the present invention further has certain requirements on the sphericity of the particles. Preferably, the aluminosilicate-free zeolite particles are spherical, and the spherical aluminosilicate-free zeolite particles having uniform particle diameter can be uniformly filled in the speaker, and the sound absorbing performance is good. Alternatively, the aluminosilicate-free zeolite particles may also have an ellipsoidal shape with an aspect ratio of less than 1.5. In this way, the particles can also achieve a uniform, dense filling in the speaker. However, if the aspect ratio is too large, or the overall shape of the particles is irregular, the pore structure inside the particles will be affected. Therefore, in order to obtain a better technical effect, it is necessary to ensure that the particles have a certain degree of sphericity.
另一方面,本发明的发明人发现,用于形成无铝硅酸盐沸石颗粒的沸石原粉微粒的粒径也会对沸石颗粒的吸附-脱附性能产生影响。如果沸石原粉微粒的粒径大于5微米,则其中生成的一级孔道的长度相对较长,在扬声器高频工作的条件下,空气分子无法快速响应地进出较长的一级孔道,造成沸石颗粒的吸附-脱附性能下降。相反,如果沸石原粉微粒的粒径过小,则一级孔道的长度过短,无法提供足够的空间吸附、压缩空气分子,也会造成沸石颗粒的吸附-脱附性能下降。所以,在本发明的一种优选实施方式中,所述沸石原粉微粒的粒径范围在0.2-5微米之间,更优地,粒径范围在0.3-1.5微米之间。On the other hand, the inventors of the present invention have found that the particle diameter of the zeolite raw powder fine particles for forming the aluminosilicate-free zeolite particles also affects the adsorption-desorption property of the zeolite particles. If the particle size of the zeolite raw powder particles is larger than 5 μm, the length of the first-order pores formed therein is relatively long, and under the condition of high-frequency operation of the speaker, the air molecules cannot quickly and responsively enter and exit the longer first-order pores, resulting in zeolite. The adsorption-desorption properties of the particles are degraded. On the contrary, if the particle size of the zeolite raw powder particles is too small, the length of the primary pores is too short to provide sufficient space for adsorption and compression of air molecules, and the adsorption-desorption performance of the zeolite particles is also lowered. Therefore, in a preferred embodiment of the invention, the zeolite raw powder particles have a particle size ranging from 0.2 to 5 microns, and more preferably, a particle size ranging from 0.3 to 1.5 microns.
虽然已经通过例子对本发明的一些特定实施例进行了详细说明,但是本领域的技术人员应该理解,以上例子仅是为了进行说明,而不是为了限制本发明的范围。本领域的技术人员应该理解,可在不脱离本发明的范围和精神的情况下,对以上实施例进行修改。本发明的范围由所附权利要求来限定。
While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
- 一种扬声器模组,其特征在于,包括:A speaker module, comprising:模组壳体,所述模组壳体具有容纳腔;a module housing, the module housing having a receiving cavity;扬声器组件,所述扬声器组件设置在所述容纳腔中,所述扬声器组件将所述容纳腔分割为后声腔和前出声区;a speaker assembly disposed in the accommodating cavity, the speaker assembly dividing the accommodating cavity into a rear acoustic cavity and a front sounding zone;填充在所述后声腔内的无铝硅酸盐沸石颗粒(1),所述无铝硅酸盐沸石颗粒(1)由沸石原粉微粒(11)经粘接剂粘接构成;Filling the aluminosilicate-free zeolite particles (1) in the rear acoustic cavity, the aluminosilicate-free zeolite particles (1) being composed of the zeolite raw powder particles (11) bonded by an adhesive;其中,所述沸石原粉微粒(11)具有一级孔道,所述一级孔道的孔径范围为0.3-20nm,在所述无铝硅酸盐沸石颗粒(1)中,所述沸石原粉微粒(11)之间具有二级孔道(2)。Wherein the zeolite raw powder particles (11) have a first-order pores having a pore diameter ranging from 0.3 to 20 nm, and in the aluminosilicate-free zeolite particles (1), the zeolite raw powder particles There is a secondary tunnel (2) between (11).
- 根据权利要求1所述的扬声器模组,其特征在于,所述一级孔道包括微孔(21)和/或介孔(22),所述微孔(21)的孔径小于2nm,所述介孔(22)的孔径范围为2-20nm。The speaker module according to claim 1, wherein the first-stage tunnel comprises micropores (21) and/or mesopores (22), and the pores (21) have a pore diameter of less than 2 nm. The pores (22) have a pore size ranging from 2 to 20 nm.
- 根据权利要求1或2所述的扬声器模组,其特征在于,所述微孔(21)的孔径范围为0.4-0.8nm,所述介孔(22)的孔径范围为2-10nm。The speaker module according to claim 1 or 2, wherein the micropores (21) have a pore diameter ranging from 0.4 to 0.8 nm, and the mesopores (22) have a pore diameter ranging from 2 to 10 nm.
- 根据权利要求1-3任意之一所述的扬声器模组,其特征在于,所述沸石原粉微粒(11)由硅源材料、模板剂以及辅料经水热晶化反应制成。The speaker module according to any one of claims 1 to 3, characterized in that the zeolite raw powder particles (11) are produced by hydrothermal crystallization of a silicon source material, a templating agent and an auxiliary material.
- 根据权利要求1-4任意之一所述的扬声器模组,其特征在于,所述沸石原粉微粒(11)为MFI沸石结构。A speaker module according to any one of claims 1 to 4, characterized in that the zeolite raw powder particles (11) are of a MFI zeolite structure.
- 根据权利要求1-5任意之一所述的扬声器模组,其特征在于,所述无铝硅酸盐沸石颗粒(1)的比表面积范围为250-550m2/g。A speaker module according to any one of claims 1 to 5, characterized in that the aluminosilicate-free zeolite particles (1) have a specific surface area in the range of from 250 to 550 m 2 /g.
- 根据权利要求1-6任意之一所述的扬声器模组,其特征在于,所述无铝硅酸盐沸石颗粒(1)的表面层粘接剂含量高于内部粘接剂含量。A speaker module according to any one of claims 1 to 6, wherein the aluminosilicate-free zeolite particles (1) have a surface layer binder content higher than the internal binder content.
- 根据权利要求1-7任意之一所述的扬声器模组,其特征在于,所述无铝硅酸盐沸石颗粒(1)呈球形或椭球形,无铝硅酸盐沸石颗粒的长宽比小于1.5,粒径范围为0.05-0.50mm。The speaker module according to any one of claims 1 to 7, wherein the aluminosilicate-free zeolite particles (1) are spherical or ellipsoidal, and the aluminosilicate-free zeolite particles have an aspect ratio smaller than 1.5, the particle size range is 0.05-0.50mm.
- 根据权利要求1-8任意之一所述的扬声器模组,其特征在于,所 述粘接剂在所述无铝硅酸盐沸石颗粒中的质量比例范围为5-15%。A speaker module according to any one of claims 1-8, characterized in that The mass ratio of the binder in the aluminosilicate-free zeolite particles ranges from 5 to 15%.
- 根据权利要求1-9任意之一所述的扬声器模组,其特征在于,所述无铝硅酸盐沸石颗粒(1)中含有掺杂元素,所述掺杂元素包括硼、铁、钛、钾、钙、锡、铯、锗中的至少一种。 The speaker module according to any one of claims 1 to 9, characterized in that the aluminosilicate-free zeolite particles (1) contain doping elements, and the doping elements include boron, iron, titanium, At least one of potassium, calcium, tin, strontium, and barium.
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CN201610789836.3 | 2016-08-31 | ||
CN201610789836.3A CN106162468A (en) | 2016-08-31 | 2016-08-31 | Speaker module |
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CN108975347A (en) * | 2018-07-28 | 2018-12-11 | 瑞声科技(南京)有限公司 | The loudspeaker enclosure of sound-absorbing material and its preparation method and application sound-absorbing material |
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CN109678392B (en) * | 2019-01-25 | 2021-10-08 | 歌尔股份有限公司 | Silica aerogel sound absorbing material and sound generating device |
CN109600701A (en) * | 2019-01-31 | 2019-04-09 | 歌尔股份有限公司 | A kind of sounding device |
CN111362272A (en) * | 2020-03-16 | 2020-07-03 | 上海交通大学 | Rear cavity filler for reducing resonance frequency of loudspeaker and preparation method |
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CN107659875A (en) | 2018-02-02 |
CN107547994A (en) | 2018-01-05 |
CN106162468A (en) | 2016-11-23 |
CN107454524A (en) | 2017-12-08 |
CN107708040A (en) | 2018-02-16 |
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