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CN-121985268-A - Sound-absorbing assembly, sound-producing device and electronic equipment

CN121985268ACN 121985268 ACN121985268 ACN 121985268ACN-121985268-A

Abstract

The invention belongs to the technical field of electroacoustic, and particularly relates to a sound absorption assembly, a sound production device and electronic equipment, wherein the sound absorption assembly comprises a shell, active carbon powder particles with average particle diameters of 1-50 mu m and sound absorption particles with average particle diameters of 200-450 mu m, wherein the active carbon powder particles are filled in an accommodating space in the shell in a mixing mode, the sound absorption particles are spherical-like particles formed by bonding a plurality of molecular sieve particles, the surface layer of each active carbon powder particle is provided with a hydrophobic structure, the stacking density of the active carbon powder particles is 0.2-0.6 g/cm 3 , the ratio of the stacking density of the active carbon powder particles to the stacking density of the sound absorption particles is 0.7-1, ventilation holes communicated with the accommodating space are formed in the shell, and the pore diameters of the ventilation holes are smaller than the minimum particle diameters of the active carbon powder particles. According to the invention, the active carbon particles can be filled in gaps generated by stacking sound-absorbing particles, so that the low-frequency acoustic performance of the sound-producing device is improved, and even if the sound-absorbing particles are broken, the shell can play a good role in isolation, and the sound-producing monomers are prevented from being polluted by broken powder.

Inventors

  • WANG CUICUI
  • PAN QUANQUAN
  • LING FENGGUANG
  • LI CHUN

Assignees

  • 歌尔股份有限公司

Dates

Publication Date
20260505
Application Date
20251226

Claims (10)

  1. 1. The sound absorption assembly is characterized by comprising a shell with an accommodating space, and active carbon particles and sound absorption particles mixed and filled in the accommodating space, wherein the surface layer of the active carbon particles is provided with a hydrophobic structure, the average particle size D50 of the active carbon particles is 1-50 mu m, the stacking density of the active carbon particles is 0.2 g/cm 3 ~0.6 g/cm 3 , and the ratio of the stacking density of the active carbon particles to the stacking density of the sound absorption particles is 0.7-1; the sound-absorbing particles are spheroidal particles formed by bonding a plurality of molecular sieve particles, and the average particle diameter D50 of the sound-absorbing particles is 200-450 mu m; The shell is provided with ventilation holes communicated with the accommodating space, and the aperture of each ventilation hole is smaller than the minimum particle size of the activated carbon powder particles.
  2. 2. The sound absorbing assembly of claim 1, wherein the hydrophobic structure of the activated carbon particles comprises at least one of a silane hydrophobic group, a fluorine atom-containing graft group, a metal oxide hydrophobic layer, a polymer coating, a biomass hydrophobic layer, a graphene layer, a carbon nanotube layer.
  3. 3. The sound absorbing assembly of claim 1, wherein the ratio of the sound absorbing particles to the activated carbon particles is 1:0.5-1 by volume.
  4. 4. The sound absorbing assembly of claim 1, wherein the shell has a thickness of 0.1 mm to 0.5 mm.
  5. 5. The sound absorbing assembly of claim 1, wherein the housing comprises a main housing and a cover housing, the main housing and the cover housing circumscribing to form the receiving space, At least one of the main shell and the cover shell is of a ventilation structure, and the ventilation structure is provided with the ventilation holes.
  6. 6. The sound absorbing assembly of claim 5, wherein the air permeable structure has an air permeability of 1000 mm/s to 1500 mm/s and/or, The bursting strength of the ventilation structure is more than or equal to 1N.
  7. 7. The sound absorbing assembly of claim 5, wherein the breathable structure comprises at least one of a fibrous woven fabric, a nonwoven fabric, a hot melt web, an open cell polymer foam, and a core-cell film.
  8. 8. The sound absorbing assembly of claim 5, wherein one of the main housing and the cover housing is a non-breathable structure comprising a film or sheet of at least one of polypropylene, polyethylene, polycarbonate, polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, polyamide, and/or, The cover shell and the main shell are bonded by an adhesive or a hot melt.
  9. 9. A sound generating device is characterized by comprising a shell with an inner space and a sound generating monomer arranged in the shell, wherein the sound generating monomer is matched with the shell to limit a front sound cavity and a rear sound cavity in the inner space of the shell, The sound absorbing assembly of any one of claims 1-8 disposed within the rear acoustic cavity.
  10. 10. An electronic device comprising the sound emitting apparatus of claim 9.

Description

Sound-absorbing assembly, sound-producing device and electronic equipment Technical Field The invention belongs to the technical field of electroacoustic technology, and particularly relates to a sound absorption assembly, a sound production device and electronic equipment. Background At present, in order to solve the problem that the low-frequency performance of a loudspeaker is reduced due to the reduction of the space of a rear acoustic cavity, technicians generally fill sound-absorbing particles made of porous materials into the rear acoustic cavity so as to realize the virtual increase effect of the resonance space of the acoustic rear cavity of the loudspeaker. However, the average particle size of the sound-absorbing particles filled in the rear sound cavity is generally 300-400 μm, and when the particles are stacked, gaps among the particles are generated, so that the volume of the rear sound cavity cannot be effectively filled, the acoustic improvement effect is reduced, in the power-on operation of the loudspeaker, the sound-absorbing particles flow along with air flow in the rear sound cavity, collision and friction occur between the sound-absorbing particles and the cavity wall or the sound-absorbing particles, and the sound-absorbing particles are easy to break and fall off to pollute sounding monomers. Thus, there is a need for improvements in existing speakers. Disclosure of Invention The invention aims to provide a sound-absorbing assembly, a sound-producing device and electronic equipment, wherein the sound-absorbing assembly can adopt a full-coverage structural design, can completely fill and attach all spaces of a rear sound cavity, active carbon particles and sound-absorbing particles are mixed and filled in a shell of the sound-absorbing assembly, the active carbon particles can be filled in gaps generated by stacking the sound-absorbing particles, the filling quantity of sound-absorbing materials in the sound-absorbing assembly is greatly improved, the low-frequency acoustic performance of the sound-producing device is further improved, the sound-absorbing materials are limited and accommodated in the shell of the sound-absorbing assembly, and in the working process, even if the sound-producing sound-absorbing particles are broken, the shell can play a good role of isolation, so that broken powder is prevented from polluting sound-producing monomers, and the durability and the service life of the sound-absorbing materials are improved. The invention provides a sound absorbing assembly, which comprises a shell with an accommodating space, and active carbon particles and sound absorbing particles mixed and filled in the accommodating space, wherein the surface layer of the active carbon particles is provided with a hydrophobic structure, the average particle size D50 of the active carbon particles is 1-50 mu m, the stacking density of the active carbon particles is 0.2 g/cm 3~0.6 g/cm3, the ratio of the stacking density of the active carbon particles to the stacking density of the sound absorbing particles is 0.7-1, the sound absorbing particles are quasi-spherical particles formed by bonding a plurality of molecular sieve particles, the average particle size D50 of the sound absorbing particles is 200-450 mu m, air holes communicated with the accommodating space are formed in the shell, and the aperture of the air holes is smaller than the minimum particle size of the active carbon particles. In some embodiments, the hydrophobic structure of the activated carbon particles comprises at least one of a silane hydrophobic group, a fluorine atom-containing grafting group, a metal oxide hydrophobic layer, a polymer coating layer, a biomass hydrophobic layer, a graphene layer, a carbon nanotube layer. In some embodiments, the filling volume ratio of the sound absorbing particles to the activated carbon particles is 1:0.5-1. In some embodiments, the sound absorbing particles have an average particle size D50 of 200 μm to 450 μm. In some embodiments, the activated carbon particles have an average particle size D50 of 1 μm to 50 μm. In some embodiments, the thickness of the housing is 0.1 mm to 0.5 mm. In some embodiments, the housing comprises a main housing and a cover housing, the main housing and the cover housing surround to form the accommodation space, at least one of the main housing and the cover housing is a ventilation structure, and the ventilation structure is provided with the ventilation holes. In some embodiments, the air permeability of the air permeable structure is 1000 mm/s to 1500 mm/s. In some embodiments, the breathable structure has a burst strength of 1 or more N. In some embodiments, the material of the ventilation structure includes at least one of a fibrous woven fabric, a non-woven fabric, a hot melt web, an open cell polymer foam, and a core-cell membrane. In some embodiments, one of the main casing and the cover casing is a non-breathable structure, and the non-brea