CN110104990A - Sound-absorbing particle and its manufacturing method and loadspeaker structure - Google Patents

Sound-absorbing particle and its manufacturing method and loadspeaker structure Download PDF

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Publication number
CN110104990A
CN110104990A CN201910435229.0A CN201910435229A CN110104990A CN 110104990 A CN110104990 A CN 110104990A CN 201910435229 A CN201910435229 A CN 201910435229A CN 110104990 A CN110104990 A CN 110104990A
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Prior art keywords
sound
absorbing
zeolite
mixed slurry
powder
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CN201910435229.0A
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Chinese (zh)
Inventor
陈煜熙
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Dongguan Shun Shun Feng Electric Co Ltd
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Dongguan Shun Shun Feng Electric Co Ltd
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Priority to CN201910435229.0A priority Critical patent/CN110104990A/en
Publication of CN110104990A publication Critical patent/CN110104990A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/06—Acrylates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing halogen
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/16—Polyurethanes
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52—Sound-insulating materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The present invention provides a kind of sound-absorbing particle, and the sound-absorbing particle is made of mixed slurry, and the mixed slurry includes zeolite powder, adhesive and water, and the weight ratio of the zeolite powder, adhesive and water is 40:1~6:40~60；Wherein, the partial size of the sound-absorbing particle is 120 μm~450 μm；Also, the natural tapped bulk density of the sound-absorbing particle is 0.2~0.8g/cm3.The present invention also provides a kind of manufacturing method of sound-absorbing particle, it includes: calcination steps, mixed slurry making step, spray drying granulation step and screening step.By the way that sound-absorbing particle of the invention is applied to loadspeaker structure, while improving loudspeaker tonequality performance (especially bass performance), also it can prevent existing sound-absorbing powder from penetrating into the inside of loudspeaker unit from speaker, and then avoid the actuation of sound-absorbing powder obstruction loudspeaker.

Description

Sound-absorbing particles, method for producing same, and speaker structure
Technical Field
The invention relates to sound-absorbing particles, a manufacturing method thereof and a loudspeaker structure applying the sound-absorbing particles.
Background
In general, a speaker is provided with a sound generating unit on one side of a sound box and a sound absorbing chamber on the other side of the sound box. In the sound absorption cavity, sound absorption powder is usually filled as a sound absorption material to improve the pressure difference between the inside and the outside of the sound box when the speaker is operated. Thus, the sound quality performance of the speaker is improved.
In particular, in a closed type enclosure structure of a small-sized speaker (for example, an enclosure of a speaker installed inside a notebook computer or a mobile phone), the effect of improving bass sounds by filling sound-absorbing powder is particularly remarkable.
However, the following problems occur when a sound absorbing powder is filled in a closed type sound box (hereinafter, the "closed type sound box" is also simply referred to as "sound box").
As the sound absorbing powder, a porous material such as zeolite or activated carbon is generally used. Since such porous materials are generally in a fine powder form, they easily penetrate from the cabinet into the interior of the speaker unit, thereby hindering the operation of the speaker, and therefore such powder materials are not suitable for direct filling into the cabinet.
Disclosure of Invention
In view of the above, the present inventors have found that there is a need to develop sound-absorbing particles as a sound-absorbing material, which have a larger volume than conventional sound-absorbing powders. By using the sound-absorbing particles of the present invention as a sound-absorbing material, the sound quality performance of the speaker can be improved, and the sound-absorbing powder can be prevented from penetrating into the speaker unit from the cabinet, thereby preventing the sound-absorbing powder from obstructing the operation of the speaker.
In addition, compared with the existing sound-absorbing powder, the sound-absorbing particles of the present invention do not obstruct the operation of the speaker, so the present invention is suitable for being directly filled into the sound box of the speaker.
Meanwhile, the inventor also provides a manufacturing method for manufacturing the sound-absorbing particles and a loudspeaker structure applying the sound-absorbing particles, so as to prevent the sound-absorbing powder from obstructing the action of the loudspeaker.
To achieve the above and other objects, the present invention provides sound-absorbing particles made of a mixed slurry, wherein the mixed slurry comprises a zeolite raw powder, a binder, and water, and a weight ratio of the zeolite raw powder to the binder to the water is 40: 1-6: 40-60; the particle size of the sound-absorbing particles is 120-450 mu m; the sound-absorbing particles have a natural tap bulk density of 0.2 to 0.8g/cm3。
In one embodiment, the sound-absorbing particles have a particle size of 150 to 300 μm.
In one embodiment, the sound-absorbing particles have a natural tap bulk density of 0.25 to 0.55g/cm3。
In one embodiment, the weight ratio of the raw zeolite powder, the binder and the water is 40: 3-5: 40-60.
In one embodiment, the adhesive is one of polyvinyl alcohol, water-based neoprene, water-based polyurethane resin and water-based polyacrylate.
In one embodiment, the binder is an aqueous polyacrylate.
In one embodiment, the raw zeolite powder has a silicon-aluminum mass ratio of 300 to 600.
In one embodiment, the raw zeolite powder has a specific surface area of 250 to 600m2Between/g.
In one embodiment, the particle size of the zeolite raw powder is 10 μm or less.
In one embodiment, the zeolite raw powder is ZSM-5 type zeolite powder, and the static water adsorption amount of the zeolite raw powder is less than 2 wt%.
In one embodiment, the mixed slurry further includes an auxiliary agent, and the weight ratio of the raw zeolite powder to the auxiliary agent is 40: 0.2 to 1.
In one embodiment, the auxiliary agent is a dispersant, or a dispersant and a cross-linking agent and/or a pH adjuster.
In one embodiment, the adjuvant is a water soluble acrylic dispersant.
To achieve the above and other objects, the present invention provides a method for manufacturing sound-absorbing particles, comprising: roasting, namely roasting the zeolite raw powder for 2-12 hours at the temperature of 300-600 ℃; a mixed slurry preparation step, namely mixing the zeolite raw powder, a binding agent and water in a weight ratio of 40: 1-6: stirring and mixing under the condition of 40-60 ℃ to obtain mixed slurry; spray drying and granulating, namely spray granulating and drying the mixed slurry to obtain a sound-absorbing particle precursor; a screening step of screening the sound-absorbing particle precursor to obtain a particle size of 120 to 450 μm and a natural tap bulk density of 0.2 to 0.8g/cm3The sound-absorbing particles of (1).
In one embodiment, in the step of preparing the mixed slurry, firstly, the raw zeolite powder is mixed with water and stirred to form a raw zeolite powder solution; then, adding a dispersing agent into the zeolite raw powder solution to form a mixed slurry precursor; and finally, adding a bonding agent into the mixed slurry precursor to form mixed slurry.
In one embodiment, in the step of preparing the mixed slurry, an auxiliary agent is further added, and the weight ratio of the raw zeolite powder to the auxiliary agent is 40: 0.2 to 1.
In one embodiment, in the step of preparing the mixed slurry, firstly, the raw zeolite powder is mixed with water and stirred to form a raw zeolite powder solution; and then, adding a binder into the zeolite raw powder solution, stirring, adding the auxiliary agent, and mixing to form the mixed slurry.
To achieve the above and other objects, the present invention provides a speaker structure, comprising: the flat sound box comprises a non-sound-absorbing area and a sound-absorbing area which are communicated; the sounding unit is arranged in the non-sound-absorbing area; a sound-absorbing unit provided in the sound-absorbing region and including the sound-absorbing particles; the guide structure is arranged in the sound absorbing cavity of the sound absorbing area and is provided with a guide-in end and a guide-out end.
In summary, the sound-absorbing particles and the speaker structure using the same according to the present invention can prevent the sound-absorbing powder from penetrating into the speaker unit from the speaker box due to their bulky characteristics, thereby preventing the sound-absorbing powder from obstructing the operation of the speaker.
Further, by filling the sound-absorbing particles in the sound box, the sound-absorbing effect can be exhibited, and the bass sound of the speaker can be improved. And the sound-absorbing particles can be filled into a sound box of a loudspeaker with preferable filling efficiency.
Further, the sound-absorbing particles can be manufactured by the manufacturing method disclosed in the present invention.
Drawings
FIG. 1 is a schematic external view of a preferred embodiment of the present invention;
FIG. 2 is an exploded schematic view of a preferred embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a preferred embodiment of the present invention;
fig. 4 is a schematic external view of another preferred embodiment of the present invention.
Reference numerals
1 flat type sound box
11 non-sound-absorbing zone
12 Sound-absorbing area
13 perfusion hole
14 sound producing hole
15 upper cover
16 lower cover
2 sound producing unit
3 Sound-absorbing Unit
4 guiding structure
41 leading-in end
42 lead-out terminal
31 ventilating layer body
32 Sound-absorbing particles
33 closure
S sound absorbing cavity
P fill Path
P1 diversion Path
Detailed Description
For a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:
first, the sound-absorbing particles according to an embodiment of the present invention will be described.
The sound-absorbing particles according to an embodiment of the present invention have a particle size of 120 to 450 μm, preferably 150 to 300 μm. When the particle diameter of the sound-absorbing particles is within this range, the sound-absorbing powder can be prevented from penetrating into the speaker unit from the sound box, as compared with conventional sound-absorbing powder.
The sound-absorbing particles have a particle diameter of 120 to 450 [ mu ] m (or 150 to 300 [ mu ] m), and the natural tap bulk density of the sound-absorbing particles is set to 0.2 to 0.8g/cm3When the sound-absorbing particles are filled in the loudspeaker box of the loudspeaker, the filling efficiency can be increased.
If the natural tap bulk density is less than 0.2g/cm3The strength of the sound-absorbing particles is not good; and if the natural tap bulk density is more than 0.8g/cm3The sound-absorbing particles have a considerable strength, but the sound-absorbing effect is deteriorated. Therefore, the natural tap bulk density is preferably 0.2 to 0.8g/cm3。
In a preferred embodiment, the sound-absorbing particles are made of a mixed slurry, and the mixed slurry includes zeolite raw powder, a binder and water.
In the mixed slurry, the weight ratio of the zeolite raw powder to the binder to the water is 40: 1-6: 40-60, preferably 40: 3-5: 40-60. By setting the weight ratio of the zeolite raw powder, the binder and the water in the mixed slurry within the above range, the slurry can be granulated by spray drying to obtain a powder having a particle diameter of 120 to 450 μm and a natural tap bulk density of 0.2 to 0.8g/cm3The sound-absorbing particles of (1).
The mixed slurry may further include an auxiliary agent. And the weight ratio of the zeolite raw powder to the auxiliary agent is 40: 0.2 to 1. By adding the auxiliary agent, the characteristics of the mixed slurry can be changed, and desired sound-absorbing particles can be obtained.
Next, the zeolite raw powder, the binder, water, and the auxiliary agent will be described.
< Zeolite raw powder >
The zeolite raw powder of a preferred embodiment of the present invention has at least one or more of the following characteristics:
(A) the silicon-aluminum mass ratio (Si/Al ratio) is more than 200;
(B) the grain diameter is less than 10 mu m;
(C) the specific surface area is more than 250m2/g；
(D) The natural tap bulk density is 0.2-0.8 g/cm3。
In terms of the silicon-aluminum mass ratio, if the silicon-aluminum mass ratio is less than 200, the hydrophobicity of the zeolite raw powder is poor. If the hydrophobicity of the zeolite raw powder is poor, moisture is likely to enter the pores of the zeolite raw powder, and the pores of the zeolite raw powder are filled up, so that the sound absorption effect is poor.
The silicon-aluminum mass ratio is preferably 300 to 600. If the silicon-aluminum mass ratio is less than 300, as described above, the hydrophobicity may be poor, and the sound absorption effect may be deteriorated. If the silicon-aluminum mass ratio is more than 600, the structure of the zeolite raw powder is deteriorated, and there may be an adverse effect on the strength of the sound-absorbing particles. Therefore, the silicon-aluminum mass ratio is preferably 300 to 600.
Furthermore, the particle size of the raw zeolite powder is less than 10 μm, and preferably less than 2 μm.
Furthermore, if the zeolite raw powder has a specific surface area of less than 250m2In the case of the solid-phase catalyst,/g, the adsorption sites of the zeolite raw powder are small, and the sound absorption effect is deteriorated.
The specific surface area is preferably 300 to 600m2Between/g. If the specific surface area is less than 300m2As described above, the adsorption sites of the zeolite raw powder are small, and the sound absorption effect may be deteriorated. If the specific surface area is more than 600m2The zeolite powder is liable to adsorb moisture and other impurities, and the sound absorption effect is affected. Therefore, the specific surface area is preferably 300 to 600m2Between/g.
Further, if the natural tap bulk density of the zeolite raw powder is 0.2 to 0.8g/cm3In the range of (1), the natural tap bulk density of 0.2 to 0.8g/cm is favorably obtained3Sound-absorbing particles in the range of (1).
Then, as the source of the zeolite raw powder, ZSM-5 type zeolite is preferable, and ZSM-5 type porous high silica zeolite is most preferable.
Further, the raw zeolite powder preferably has a static water adsorption amount of less than 2%, more preferably less than 1%. If the static water adsorption amount (mg/g,%) is greater than 2%, the zeolite raw powder becomes easy to adsorb moisture, and the moisture easily enters into the pores of the zeolite raw powder, so that the pores of the zeolite raw powder are filled up, and the sound absorption effect is deteriorated.
In a most preferred embodiment of the zeolite raw powder, the zeolite raw powder is, for example, a porous high-silica zeolite derived from ZSM-5 type, and the zeolite raw powder has a silicon-aluminum mass ratio of 300 to 400 and a specific surface area of 300 to 450m2(ii)/g, the powder particle diameter is less than 1 μm, and the static water adsorption amount is less than 1%.
< Binder >
In a preferred embodiment of the present invention, the binder is polyvinyl alcohol, water-based neoprene, water-based polyurethane resin, water-based polyacrylate, and preferably water-based polyacrylate.
< water >)
The water is not particularly limited as long as it can appropriately dissolve the zeolite raw powder and the binder. Examples of suitable water include pure water, distilled water, and deionized water.
< adjuvant >
In a preferred embodiment of the present invention, the mixed slurry further comprises an auxiliary agent. The auxiliary agent is a dispersant, or a dispersant and a cross-linking agent and/or a pH regulator, and is preferably a dispersant. In the mixed slurry, the weight ratio of the zeolite raw powder to the auxiliary agent is 40: 0.2 to 1.
The auxiliary is a dispersant selected from water-soluble carboxylic acid dispersants, preferably water-soluble acrylic dispersants.
By adding the dispersing agent as an aid, separation of particles (for example, zeolite raw powder) in a suspension (for example, a zeolite raw powder solution) can be accelerated, agglomeration is avoided, stirring is not easy, and a mixed slurry with good mutual solubility can be formed.
It should be noted that when an auxiliary is present in the mixed slurry, a dispersant is preferably used, and the rest of the auxiliary is added as appropriate. When a plurality of auxiliary components are present, the "weight ratio of the zeolite raw powder to the auxiliary" means "the weight ratio of the zeolite raw powder to the total of the plurality of auxiliary components".
When the auxiliary agent includes a crosslinking agent, the crosslinking agent is preferably a water-based blocked crosslinking agent. The acid and alkali resistance of the particles can be enhanced by adding the cross-linking agent.
Further, when the auxiliary includes a pH adjuster, the pH adjuster may use an existing pH adjuster. The pH value regulator is added to change the pH value of the particles, reduce the acidity of the surfaces of the particles, reduce the agglomeration of the particles and improve the suspension state.
Next, a method for producing the sound-absorbing particles will be described.
In a preferred embodiment, the method for manufacturing the sound-absorbing particles at least comprises: the method comprises the steps of roasting, preparing mixed slurry, spray drying and granulating and screening. In a more preferred embodiment, the method for manufacturing the sound-absorbing particles may further include a drying step. The respective steps are explained below.
< step of calcination >
The temperature and time of the calcination step are not particularly limited, and the template in the zeolite raw powder can be removed without damaging the structure of the zeolite raw powder. The temperature and time of the baking step are preferably 300 to 600 ℃ for 2 to 12 hours. Through the roasting step, the template agent in the zeolite raw powder can be removed, so that the smoothness of the pore channels in the zeolite raw powder is ensured, and the sound absorption effect of the sound absorption particles prepared through the subsequent steps is improved.
< step of producing Mixed slurry >
And a mixed slurry preparation step, namely stirring the zeolite raw powder subjected to the roasting step, a binding agent and water to form a mixed slurry. In a preferred embodiment, the mixed slurry making step may comprise the following substeps: a, mixing and stirring raw zeolite powder and water to form a raw zeolite powder solution; and B, adding a binding agent into the zeolite raw powder solution, stirring, and forming the mixed slurry on the premise of ensuring good mutual solubility of the components. In the step B, it is preferable that the binder is added to the zeolite raw powder solution and stirred, and then the auxiliary agent (including at least a dispersant) is added and mixed to form the mixed slurry.
The mixed slurry preparation step may further include the following substeps: a, mixing and stirring raw zeolite powder and water to form a raw zeolite powder solution; b', adding a dispersing agent into the zeolite raw powder solution to form a mixed slurry precursor; and C, adding a bonding agent into the mixed slurry precursor to form mixed slurry.
Here, in the mixed slurry, the weight ratio of the zeolite raw powder, the binder and water is in the range of 40: 1-6: 40-60. In the case where the mixed slurry contains the auxiliary, the weight ratio of the zeolite raw powder, the binder, water and the auxiliary is 40: 1-6: 40-60: 0.2 to 1.
< step of spray drying granulation >
The spray drying granulation step is to spray granulate and dry (dry) the mixed slurry obtained in the mixed slurry preparation step to obtain a sound-absorbing particle precursor. In the spray drying granulation step, a spray drying granulation method using a Pressure Nozzle (Pressure Nozzle) or a Rotary table (Rotary Disc) can be selected. The former atomizes the mixed slurry from top to bottom by a pressure nozzle, and the latter atomizes the mixed slurry by mainly utilizing the centrifugal force principle and controlling the rotating speed of a rotating disc from top to bottom.
Further, since the method for producing the sound-absorbing particles uses water, there is no risk of handling and contamination can be reduced, and therefore, spray granulation may be performed using a general spray granulator.
In a preferred embodiment, the spray drying granulation step uses a centrifugal spray granulator having an inner diameter of 2.5 meters or more. Thereby, the sound-absorbing particles of the present invention are more easily obtained.
In a preferred embodiment, in the spray drying granulation step, water vapor generated during spray granulation is also discharged and recovered. Thereby, the sound-absorbing particles of the present invention are more easily obtained.
< sieving step >
A screening step of screening the sound-absorbing particle precursor obtained in the spray drying granulation step by using a screening machine to obtain a particle size of 120-450 μm and a natural tap bulk density of 0.2-0.8 g/cm3The sound-absorbing particles of (1).
< drying step >
A drying step may also be performed for the sound-absorbing particles obtained in the screening step. The moisture can be further removed by the drying step. After the drying step, the sound-absorbing particles can also be used after standing for a period of time.
By the manufacturing method of the sound-absorbing particles, the sound-absorbing particles particularly suitable for the closed type sound box of the micro-speaker can be obtained.
Next, a speaker structure according to a preferred embodiment of the present invention will be described below.
Referring to fig. 1 to 3, as shown, a speaker structure of a preferred embodiment includes: flat sound box 1, sound production unit 2 and sound absorption unit 3.
Flat audio amplifier 1 is including the non-sound absorbing zone 11 that is linked together and inhale sound district 12, flat audio amplifier 1's leptoprosopy side is equipped with the intercommunication two filling holes 13 of sound absorbing zone 12, just flat audio amplifier 1's broadside side is for having the intercommunication sound hole 14 of non-sound absorbing zone 11. In a preferred embodiment of the present invention, the flat sound box 1 comprises an upper cover 15 and a lower cover 16, the non-sound-absorbing region 11, the sound-absorbing region 12 and the filling hole 13 are disposed on the lower cover 16, and the sound-emitting hole 14 is disposed on the upper cover 15.
The sound production unit 2 is arranged in the non-sound-absorption area 11 and connected with the sound production hole 14.
Inhale sound unit 3 and locate sound absorption district 12, inhale sound unit 3 including ventilative layer body 31, inhale sound granule 32 and two closure 33, ventilative layer body 31 is located sound absorption district 12 is in order to form the sound absorption chamber, inhales sound granule 32 and passes through pouring hole 13 is located the sound absorption chamber of sound absorption district 12, closure 33 seals respectively pouring hole 13.
The number of pouring holes 13 and closures 33 can be adjusted as needed.
In a modified example, the filling hole is not provided on the narrow-side surface of the flat sound box 1, but is provided on the top or bottom surface (not shown) of the sound-absorbing chamber of the sound-absorbing region 12.
Next, referring to fig. 4, in a preferred variation of the present invention, a guiding structure 4 is further disposed in the sound-absorbing cavity S formed by the sound-absorbing region 12. The parts other than the sound absorbing region 12 in fig. 4 are the same as those in fig. 1 to 2, and the description thereof is omitted here.
In fig. 4, the filling path P is defined by the positional relationship between the filling hole 13 and the sound-absorbing chamber S. Generally, when the sound absorption region 12 is erected (i.e., the pouring hole 13 is directed upward in the direction of gravity), the sound absorbing particles 32 filled from the pouring hole 13 enter the sound absorption chamber S along the filling path P.
The guiding structure 4 has a guiding end 41 and a guiding end 42 to form a guiding path P1, the guiding end 41 of the guiding structure 4 intersects with the filling path P, and the guiding end 41 is closer to the filling hole 13 than the guiding end 42, so as to divide the sound-absorbing particles from the front section of the filling path P along the guiding path P1 and guide the sound-absorbing particles to the outside of the filling path P.
The shape of the guide structure 4 is preferably S-shaped or meniscus-shaped.
Furthermore, although only one filling hole 13 is illustrated in fig. 4, in another preferred embodiment, two filling holes 13 may be provided as shown in fig. 1 to 3.
In addition, in a variation in which the filling hole is provided in the top surface or the bottom surface of the sound-absorbing chamber of the sound-absorbing region 12, the guide structure 4 may be provided as shown in fig. 4.
Therefore, in the case where two or more filling holes 13 are provided, two or more filling paths P can be defined by the positional relationship between each filling hole 13 and the sound absorbing chamber S as shown in fig. 4. Then, the guide structures 4 can be respectively disposed on the respective filling paths P in the sound-absorbing chamber S to guide the sound-absorbing particle branches.
By providing the guide structure 4, the sound-absorbing particles of the present invention can be more uniformly distributed when being filled into the sound-absorbing region 12, thereby reducing the occurrence of the problem of tapered accumulation, increasing the efficiency of filling the sound-absorbing cavity S with the sound-absorbing particles 32, and shortening the filling time.
[ examples ]
< production of Sound-absorbing particles >
First, a ZSM-5 type porous high silica zeolite powder (300 to 400 mass ratio of silicon to aluminum, 300 to 450m specific surface area) is used2(g), the powder particle diameter is less than 1 mu m, and the static water adsorption capacity is less than 1 percent) as the zeolite raw powder.
Then, mixing the zeolite raw powder subjected to the roasting step and water in a weight ratio of 40: 50 to form a zeolite raw powder solution. Then, an aqueous polyacrylate as a binder is added to the zeolite raw powder solution and stirred, and then a water-soluble acrylic dispersant as an auxiliary agent is added thereto, and after mixing and stirring, a mixed slurry is prepared.
Here, in the mixed slurry, the weight ratio of the zeolite raw powder, the binder, water and the auxiliary agent is 40: 5: 50: 0.5.
finally, screening out the sound-absorbing particles with the particle size of 150-300 microns by using a screening machine. In addition, the natural tap bulk density of the sound-absorbing particles is 0.25 to 0.55g/cm3。
< Assembly of speaker Structure >
First, the sound unit 2 is disposed in the non-sound-absorbing region 11, the air-permeable layer 31 is disposed in the sound-absorbing region 12 to form the sound-absorbing cavity, and then the upper cover 15 and the lower cover 16 are combined together, so that the flat sound box 1 is combined with the sound unit 2 and the air-permeable layer 31.
Next, the sound-absorbing particles 32 obtained by the method for manufacturing sound-absorbing particles are rapidly poured (filled) from one of the pouring holes 13 to the sound-absorbing cavity of the sound-absorbing region 12 by gravity. Then, the sound-absorbing particles 32 are poured through another pouring hole 13, so that the sound-absorbing cavities of the sound-absorbing region 12 are filled with the sound-absorbing particles 32, and finally, the pouring holes 13 are respectively sealed by the sealing members 33. Thus, a speaker structure having the sound-absorbing particles 32 of the present invention can be completed.
Further, the guide structure 4 can be provided to increase the efficiency of filling the sound-absorbing particles 32 into the speaker structure.
After the above assembly is completed, the upper cover 15 and the lower cover 16 of the flat sound box 1 form a closed space, and the sound absorption region 12 is in gas communication with the non-sound absorption region 11 through the gas permeable layer 31, so that the gas generated when the sound generating unit 2 is activated can enter the sound absorbing particles 32 of the sound absorption region 12, and the sound absorbing particles 32 achieve a preferable sound absorbing effect, so as to further improve the low frequency performance of the sound generating unit 2.
As for the characteristic of enhancing the low frequency performance, for example, in a closed type enclosure having a volume of 2c.c., the minimum resonance frequency (Fo) of the micro-speaker is 1000 Hz. After the enclosure was filled with the sound-absorbing particles of the present invention to 2/3 full, its lowest resonance frequency (Fo) dropped to 800 Hz. It is thus understood that the sound-absorbing particles of the present invention can be filled in a sound box to exhibit a sound-absorbing effect and improve the bass sound of a speaker.
Further, after the speaker structure is used for a long time, there is no case where sound-absorbing particles (sound-absorbing material) penetrate from the cabinet into the inside of the speaker unit and hinder the speaker from operating.
In addition, compared with the filling holes arranged on the top surface or the bottom surface of the sound absorption cavity, the filling efficiency of the sound absorption particles can be improved by the filling holes arranged on the narrow surface side of the flat sound box.
As described above, by using the sound-absorbing particles of the present invention as a sound-absorbing material, the sound quality performance (especially, bass sound performance) of a speaker can be improved, and the sound-absorbing powder can be prevented from penetrating from a cabinet into a speaker unit, thereby preventing the sound-absorbing powder from interfering with the operation of the speaker.
While the invention has been disclosed in terms of preferred embodiments, it will be understood by those skilled in the art that these embodiments are merely illustrative of the invention and should not be construed as limiting the scope of the invention. It should be noted that all changes and substitutions equivalent to the described embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention is defined by the claims.

Claims (18)

1. A sound-absorbing particle, characterized in that:
the sound-absorbing particles are made of mixed slurry, the mixed slurry comprises zeolite raw powder, a binder and water, and the weight ratio of the zeolite raw powder to the binder to the water is 40: 1-6: 40-60; wherein,
the particle size of the sound-absorbing particles is 120-450 mu m; in addition, the air conditioner is provided with a fan,
the natural tap bulk density of the sound-absorbing particles is 0.2-0.8 g/cm3。
2. The sound-absorbing particles according to claim 1, wherein the particle diameter of the sound-absorbing particles is 150 to 300 μm.
3. The sound-absorbing particle according to claim 1, wherein the sound-absorbing particle has a natural tap bulk density of 0.25 to 0.55g/cm3。
4. The sound-absorbing particles according to claim 1, wherein the weight ratio of the raw zeolite powder, the binder and water is 40: 3-5: 40-60.
5. The sound-absorbing particle according to claim 1, wherein the binder is one of polyvinyl alcohol, aqueous chloroprene rubber, aqueous urethane resin, and aqueous polyacrylate.
6. The sound-absorbing particle according to claim 5, wherein the binder is an aqueous polyacrylate.
7. The sound-absorbing particle according to claim 1, wherein the zeolite raw powder has a silicon-aluminum mass ratio of 300 to 600.
8. The sound-absorbing particles according to claim 1, wherein the raw zeolite powder has a specific surface area of 250 to 600m2Between/g.
9. The sound-absorbing particles according to claim 1, wherein the raw zeolite powder has a particle size of 10 μm or less.
10. The sound-absorbing particle as claimed in any one of claims 1 to 9, wherein the raw zeolite powder is a ZSM-5 type zeolite powder and has a static water adsorption amount of less than 2 wt%.
11. The sound-absorbing particles according to claim 1 or 4, wherein the mixed slurry further comprises an auxiliary, and the weight ratio of the raw zeolite powder to the auxiliary is 40: 0.2 to 1.
12. The sound-absorbing particles according to claim 11, wherein the auxiliary is a dispersant, or a dispersant and a crosslinking agent and/or a pH adjuster.
13. The sound-absorbing particles as claimed in claim 11, wherein the auxiliary agent is a water-soluble acrylic dispersant.
14. A method for producing sound-absorbing particles, comprising:
roasting, namely roasting the zeolite raw powder for 2-12 hours at the temperature of 300-600 ℃;
a mixed slurry preparation step, namely mixing the zeolite raw powder, a binding agent and water in a weight ratio of 40: 1-6: stirring and mixing under the condition of 40-60 ℃ to obtain mixed slurry;
spray drying and granulating, namely spray granulating and drying the mixed slurry to obtain a sound-absorbing particle precursor;
a screening step of screening the sound-absorbing particle precursor to obtain a particle size of 120 to 450 μm and a natural tap bulk density of 0.2 to 0.8g/cm3The sound-absorbing particles of (1).
15. The method of manufacturing sound-absorbing particles according to claim 14, wherein in the mixed slurry manufacturing step, first, a zeolite raw powder is mixed with water and stirred to form a zeolite raw powder solution; then, adding a dispersing agent into the zeolite raw powder solution to form a mixed slurry precursor; and finally, adding a bonding agent into the mixed slurry precursor to form mixed slurry.
16. The method of manufacturing sound-absorbing particles according to claim 14, wherein an auxiliary is further added in the mixed slurry manufacturing step, and the weight ratio of the raw zeolite powder to the auxiliary is 40: 0.2 to 1.
17. The method of manufacturing sound-absorbing particles according to claim 14, wherein in the mixed slurry manufacturing step, first, a zeolite raw powder is mixed with water and stirred to form a zeolite raw powder solution; and then, adding a binder into the zeolite raw powder solution, stirring, adding an auxiliary agent, and mixing to form the mixed slurry.
18. A loudspeaker structure, comprising:
the flat sound box comprises a non-sound-absorbing area and a sound-absorbing area which are communicated;
the sounding unit is arranged in the non-sound-absorbing area;
a sound-absorbing unit provided in the sound-absorbing region and including the sound-absorbing particles according to any one of claims 1 to 13;
the guide structure is arranged in the sound absorbing cavity of the sound absorbing area and is provided with a guide-in end and a guide-out end.
CN201910435229.0A 2019-05-23 2019-05-23 Sound-absorbing particle and its manufacturing method and loadspeaker structure Pending CN110104990A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111147987A (en) * 2020-01-02 2020-05-12 歌尔股份有限公司 Sound-absorbing particle, sound-generating device, and electronic apparatus
CN111163403A (en) * 2020-01-02 2020-05-15 歌尔股份有限公司 Sound-absorbing particle, sound-generating device, and electronic apparatus
CN114827799A (en) * 2021-01-28 2022-07-29 镇江贝斯特新材料有限公司 Porous block material and application thereof, electronic device for reducing wind noise and application thereof
CN118102193A (en) * 2024-04-25 2024-05-28 歌尔股份有限公司 Sound-absorbing particle, preparation method thereof, sound-producing device and electronic equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107500604A (en) * 2017-09-21 2017-12-22 苏州夸克新材料科技有限公司 A kind of follow-on sound-absorbing material
CN108059388A (en) * 2017-11-29 2018-05-22 瑞声科技(新加坡)有限公司 Sound-absorbing particle and preparation method thereof, loudspeaker enclosure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107500604A (en) * 2017-09-21 2017-12-22 苏州夸克新材料科技有限公司 A kind of follow-on sound-absorbing material
CN108059388A (en) * 2017-11-29 2018-05-22 瑞声科技(新加坡)有限公司 Sound-absorbing particle and preparation method thereof, loudspeaker enclosure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111147987A (en) * 2020-01-02 2020-05-12 歌尔股份有限公司 Sound-absorbing particle, sound-generating device, and electronic apparatus
CN111163403A (en) * 2020-01-02 2020-05-15 歌尔股份有限公司 Sound-absorbing particle, sound-generating device, and electronic apparatus
CN114827799A (en) * 2021-01-28 2022-07-29 镇江贝斯特新材料有限公司 Porous block material and application thereof, electronic device for reducing wind noise and application thereof
CN118102193A (en) * 2024-04-25 2024-05-28 歌尔股份有限公司 Sound-absorbing particle, preparation method thereof, sound-producing device and electronic equipment
CN118102193B (en) * 2024-04-25 2024-08-16 歌尔股份有限公司 Sound-absorbing particle, preparation method thereof, sound-producing device and electronic equipment

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