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WO2019138969A1 - Boîte d'insonorisation - Google Patents

Boîte d'insonorisation Download PDF

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Publication number
WO2019138969A1
WO2019138969A1 PCT/JP2019/000088 JP2019000088W WO2019138969A1 WO 2019138969 A1 WO2019138969 A1 WO 2019138969A1 JP 2019000088 W JP2019000088 W JP 2019000088W WO 2019138969 A1 WO2019138969 A1 WO 2019138969A1
Authority
WO
WIPO (PCT)
Prior art keywords
soundproof
sound
fine
honeycomb core
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/000088
Other languages
English (en)
Japanese (ja)
Inventor
昇吾 山添
真也 白田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Priority to JP2019564669A priority Critical patent/JPWO2019138969A1/ja
Publication of WO2019138969A1 publication Critical patent/WO2019138969A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the present invention relates to a soundproof box, and more specifically, at least two or more types of soundproof walls having a soundproof structure of different frequency characteristics including a soundproof wall having a soundproof structure having a through hole in one of two face plates sandwiching a honeycomb core. It relates to the soundproof box used.
  • a box using a honeycomb board as a wall material is lightweight and has high rigidity, it is used as a soundproof box that can be easily installed.
  • the sound absorbing material is not disposed inside the box, there is a problem that the reverberation in the box becomes large and a problem that the sound reflected inside the box leaks out of the box, so the soundproof performance of the box is deteriorated.
  • the soundproofness of the soundproof box is enhanced, but the volume inside the box is reduced.
  • the wall of such a box is constituted by a honeycomb structure, and one surface plate of the surface plate covering both sides of the honeycomb core is made a porous material (see Patent Document 1), or a plurality of By providing a perforated surface plate having through holes and providing a sound absorbing material and / or a sound insulating material on this perforated surface plate (see Patent Documents 2, 3 and 4), or forming a honeycomb core into a multilayer structure, in between By arranging the internal porous plate (see Patent Document 5), it is intended to improve the soundproofing performance such as the sound absorption coefficient while reducing the weight as compared with the prior art.
  • Patent Document 1 proposes a sound absorber in which a porous material made of a paper material having a predetermined porosity is disposed on a honeycomb utilizing Helmholtz resonance of the honeycomb.
  • Patent Document 2 proposes that a fine through-hole corresponding to a honeycomb cell is formed in a surface plate bonded on a honeycomb to constitute a Helmholtz sound absorbing structure, and further, to bond an unwoven fabric on the upper surface thereof. With this structure, the sound absorbing effect can be added while maintaining high rigidity, and the sound absorbing frequency band can be expanded by the non-woven fabric.
  • Patent Documents 3 and 4 fine sound holes corresponding to the honeycomb cells are formed in the face plate bonded on the honeycomb to form a sound absorbing structure, and a sound absorbing material and / or a sound insulating material is provided on the upper surface thereof.
  • the sound insulation effect can be enhanced while maintaining high rigidity, and the sound insulation effect can be further enhanced by the sound absorbing material and / or the sound insulating material.
  • the honeycomb core between the porous surface plate and the back plate has a single-layer structure in the peripheral portion and a multi-layer structure in the inner portion, and improves the sound insulation performance as a partition panel in which one or more internal porous plates are disposed therebetween.
  • the reverberation time in the room can be optimized. Further, in Patent Document 5, the number of resonance frequencies that can be absorbed by the Helmholtz resonance principle is increased by setting the aperture ratio of the porous surface plate and the internal porous plate in a stepwise smaller manner, thereby absorbing a broad band sound. be able to.
  • the object of the present invention is to solve the above-mentioned problems of the prior art and to provide at least two types of soundproof structures of different frequency characteristics including a soundproof wall having a soundproof structure having a through hole in one of two face plates sandwiching a honeycomb core.
  • An object of the present invention is to provide a soundproof box capable of realizing thinness, lightness, high rigidity and broad-band soundproofing by using the above soundproof wall.
  • sound insulation includes the meanings of “sound insulation” and “sound absorption” as acoustic characteristics, but in particular means “sound insulation”.
  • sound insulation refers to “shielding the sound”. That is, “sound insulation” means “do not transmit sound”. Therefore, “sound insulation” means including “reflecting” sound (reflection of sound) and “absorbing” sound (absorption of sound) (Sanshodo Daijinrin (third edition), and Japanese acoustics) See the materials society web page http://www.onzai.or.jp/question/soundproof.html, and http://www.onzai.or.jp/pdf/new/gijutsu201312_3.pdf). In the following, basically, “reflection” and “absorption” are not distinguished, but both are referred to as “sound insulation” and “shielding”, and when both are distinguished, “reflection” and “absorption” are said. .
  • a soundproof box has a honeycomb core, a first face plate sandwiching the honeycomb core, and a second face plate, and a through hole perforated in the first face plate.
  • the plurality of soundproof walls have a soundproof structure, and the plurality of soundproof walls have two or more types of soundproof walls having a soundproof structure having different frequency characteristics.
  • two types of soundproof walls in the two or more types of soundproof walls are disposed to face each other.
  • two more types of soundproof walls in two or more types of soundproof walls be disposed to face each other.
  • a soundproof structure has a sound-absorbing body arrange
  • a soundproof wall having a soundproof structure having a sound absorbing body and a soundproof wall having a soundproof structure excluding the sound absorbing body are disposed to face each other.
  • the 1st face plate of a soundproof structure has a through-hole from which a diameter differs.
  • the soundproof structure constitutes a Helmholtz resonator with a second surface plate and a space surrounded by a through hole having at least one diameter of the through holes having different diameters of the first surface plate and the inner surface of the honeycomb core.
  • the soundproof structure includes an air column resonator with a second surface plate and a space surrounded by a through hole having at least one diameter of through holes with different diameters of the first surface plate and the inner surface of the honeycomb core.
  • the honeycomb core is preferably made of paper, metal or resin.
  • the second front plate is preferably made of paper, metal or resin.
  • the first front plate is made of paper, metal or resin.
  • the high frequency side frequency (f2) is lower than the high frequency absorption peak frequency (f3),
  • the sound absorption coefficient of the soundproof wall which has this absorption peak is more than the frequency (f4) by the side of low frequency among the frequencies in 10%.
  • the diameter of the through hole is preferably 1.0 mm or more, and the opening ratio of the through hole in the first surface plate is preferably 1.0% or more.
  • the thickness of the sound absorber is preferably 50 mm or less.
  • the sound absorber is preferably made of a fine through hole plate, a woven cloth, a knit or a non-woven fabric.
  • the fine through hole plate preferably penetrates in the thickness direction and has a plurality of fine through holes each having a diameter of 1 ⁇ m to 250 ⁇ m.
  • the material of a fine through-hole board is a flame retardant material.
  • the flame retardant material is preferably metal.
  • the metal is preferably aluminum or an aluminum alloy.
  • a sound-absorbing body has a deodorizing function.
  • the sound absorber be disposed only on one surface located on the honeycomb core side of the first front plate.
  • the sound absorbers are disposed on both surfaces of the first front plate.
  • the present invention it is thin by using for at least two or more types of soundproof walls having a soundproof structure of different frequency characteristics including a soundproof wall having a soundproof structure having a through hole in one of two face plates sandwiching a honeycomb core. It is possible to realize light weight, high rigidity and wide-range sound insulation.
  • FIG. 5 is a top view schematically showing the soundproof structure shown in FIG. 4 partially broken. It is a fragmentary sectional view showing typically another example of the soundproofing structure used as a soundproofing wall in the soundproofing box of the present invention.
  • FIG. 7 is a top view schematically showing the soundproof structure shown in FIG.
  • FIG. 1 It is a fragmentary sectional view showing typically another example of the soundproofing structure used as a soundproofing wall in the soundproofing box of the present invention.
  • FIG. 1 It is sectional drawing which shows typically an example of the Helmholtz resonator used for this invention. It is a graph showing the aperture ratio dependence of the normal incidence sound absorption coefficient of the Helmholtz resonator shown in FIG. It is a graph showing the spectrum of the sound pressure of the Helmholtz resonator shown in FIG. It is a graph showing the noise level with respect to the aperture ratio of the Helmholtz resonator shown in FIG. It is a fragmentary sectional view showing typically another example of the soundproofing structure used as a soundproofing wall in the soundproofing box of the present invention.
  • FIG. 1 is a perspective view schematically showing an example of an acoustic measurement system of a soundproof box of Example 1 of the present invention and Comparative Examples 1 to 3. It is a graph which shows the noise level of the exterior of the soundproof box of Example 1 of this invention, and Comparative Examples 1-3. It is a graph which shows the noise level inside the soundproof box of Example 1 of this invention, and Comparative Examples 1-3.
  • a soundproof box according to the present invention will be described in detail based on a preferred embodiment shown in the attached drawings. Although the description of the configuration requirements described below may be made based on the representative embodiments of the present invention, the present invention is not limited to such embodiments.
  • a numerical range represented using “to” means a range including numerical values described before and after “to” as the lower limit value and the upper limit value.
  • a soundproof box according to the present invention comprises a plurality of soundproof walls having a soundproof structure having a honeycomb core, a first face plate sandwiching the honeycomb core, and a second face plate, and a through hole perforated in the first face plate.
  • the plurality of soundproof walls are soundproof boxes having two or more types of soundproof walls having a soundproof structure having frequency characteristics different from one another.
  • the soundproof box according to the present invention uses at least two or more types of soundproof walls having a soundproof structure of different frequency characteristics including a soundproof wall having a soundproof structure having a through hole in one of two face plates sandwiching a honeycomb core. It is possible to realize thin, light weight, high rigidity and broad band soundproofing.
  • the soundproof box according to the present invention can constitute a soundproof box capable of wide-range soundproofing with a simple box configuration by enhancing the sound absorbing performance of the soundproof wall.
  • the soundproof box of the present invention can also be used, for example, as a soundproof cabin for pets such as a kennel, a soundproof box for a device (generator, PC) as a noise source, or a soundproof room for people.
  • a soundproof cabin for pets such as a kennel
  • a soundproof box for a device generator, PC
  • a soundproof room for people or a soundproof room for people.
  • an opening for intake and an opening for exhaust may be provided in the soundproof structure on either side of the soundproof box, although not shown.
  • the soundproof box of the present invention generally uses a soundproof wall on the entire surface of a polyhedron such as a rectangular parallelepiped or the entire surface except one surface
  • the present invention is not limited to this, and a polyhedron It may be a cylindrical body of a soundproof surrounding structure using a soundproof wall on the entire surface except the two opposing faces of the above.
  • the soundproof box according to the present invention is formed by boxing the inside (sidewalls excluding windows, ceilings, floors, etc.) of buildings and other building structures (eg, houses, halls, elevators, music classrooms, meeting rooms etc.) It can be used for building applications such as covering panels and the like, transportation applications such as interiors of automobiles, and logistics applications such as box materials and packing materials.
  • the soundproof structure of the present invention can be used for other copying machines, blowers, air conditioners, ventilating fans, pumps, generators, ducts and the like.
  • the soundproof structure of the present invention further includes industrial machines such as coating machines in factories and the like, various types of manufacturing equipment emitting sounds such as rotary machines and transport machines, vehicles such as automobiles and trains, Equipment for transportation of aircraft, etc., as well as refrigerators, washing machines, dryers, televisions, copiers, microwave ovens, game machines, air conditioners, fans, PCs (personal computers), vacuum cleaners, air purifiers, ventilation fans, etc. It can be used for general household appliances etc.
  • the soundproof box of this invention is suitably arrange
  • FIG. 1 is a perspective view schematically showing an example of a soundproof box according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the soundproof box shown in FIG.
  • the soundproof box 30 according to the present invention has a rectangular parallelepiped shape, and among the six sides, the soundproof wall 32 on the right side in FIG. 1, the soundproof wall 34 on the left side, the four soundproof walls 36 on the near side in FIG. 1, the back side in FIG. 1, the upper side (ceiling) in FIG. Have.
  • the soundproof wall 32 has the soundproof structure 10 necessary for the present invention
  • the soundproof wall 34 has the soundproof structure 10A necessary for the present invention.
  • the soundproof structure 10 of the soundproof wall 32 and the soundproof structure 10A of the soundproof wall 34 which will be described in detail later, both have a honeycomb core 12 and a through hole 18 sandwiching the honeycomb core 12 as shown in FIG.
  • the soundproof structure 10A further has the sound absorbing body 22, the soundproof structure 10A has different frequency characteristics, although it has the first face plate 16 and the second face plate 20 without the through holes.
  • the remaining four soundproof walls 36 have a soundproof structure 11 that can be used together in the present invention.
  • the soundproof structure 11 will be described in detail later, as shown in FIG. 2, the soundproof structure 11 has a honeycomb core 12 and two second surface plates 20 having no through holes and sandwiching the honeycomb core 12. It has frequency characteristics different from 10 and 10A.
  • the soundproof box 30 according to the present invention as shown in FIGS. 1 and 2, the soundproof structure 10 having different frequency characteristics and the two soundproof walls 32 and 34 having 10A are disposed to face each other. Is preferred. However, the present invention is not limited thereto, and may not be disposed to face each other. For example, in the example shown in FIG. 1, one of the four sound barriers 36 may be replaced with the sound barrier 34.
  • the soundproof box 30 shown in FIGS. 1 and 2 has a soundproof structure 10 having different frequency characteristics and a pair of two soundproof walls 32 and 34 having 10A.
  • the invention is not limited to this, and may have two or more pairs. That is, it is preferable to increase the soundproofing effect by increasing the number of pairs of soundproof walls in which the soundproofing structures having different sound absorbing properties are arranged to two or three.
  • the soundproof box 30A shown in FIG. 3 in addition to the two soundproof walls 32 and 34 arranged opposite to each other, the two soundproof walls 32a arranged opposite to each other, and There may be three sets of the set 34a and the two sets of the sound barriers 32b and 34b disposed to face each other.
  • FIG. 3 in addition to the two soundproof walls 32 and 34 arranged opposite to each other, the two soundproof walls 32a arranged opposite to each other, and There may be three sets of the set 34a and the two sets of the sound barriers 32b and 34b disposed to face each other. In the example shown in FIG.
  • the sound barriers 32a and 32b have a soundproof structure 10
  • the sound barriers 34a and 34b have a soundproof structure 10A.
  • the sound absorbing characteristics of the three opposing soundproof walls of the soundproof wall consisting of a honeycomb core are different.
  • all three dimensions in the soundproof box can also correspond to the mode by adopting such a configuration.
  • the two soundproof walls 32 and 34, 32a and 34a, and 32b and 34b are used, but the present invention is not limited thereto. I will not.
  • two or more soundproof walls having a soundproof structure having different frequency characteristics may be provided, and they may not be disposed to face each other.
  • the soundproof walls 32 and 34 having the soundproof structures 10 and 10A have three types of soundproof walls in which a soundproof wall having a soundproof structure 10B (see FIG. 8) necessary for the present invention described later is added. Also good.
  • any soundproof structure having different frequency characteristics may be used.
  • the through holes 18 of the first surface plate 16 are The diameter may be different, the size of the honeycomb core 12 may be different, or the sound absorber 22 may be different.
  • the low frequency sound has a long wavelength, it interferes in the soundproof box and easily forms a mode. Therefore, it tends to leak out of the soundproof box.
  • modes are formed between soundproof walls which are paired in a six-sided box (parallel to each other), and there are roughly three modes. Therefore, in order to soundproof each mode at various frequencies, the frequency of the soundproof structure (soundproofing member) of at least one pair of opposing soundproof walls as in the soundproof box 30 and 30A shown in FIG. 1 and FIG. It is desirable that the characteristics be different.
  • these soundproof walls have a mechanism that can be detached from each other.
  • a mechanism that can be detached from each other it is possible to combine various types of soundproof walls arbitrarily and easily to soundproof various modes. That is, by providing an attachment / detachment mechanism which can easily remove the soundproof wall, various soundproof walls can be easily combined, which is preferable.
  • FIG. 4 is a cross-sectional view schematically showing an example of a soundproofing structure used for the soundproofing box of the present invention.
  • FIG. 5 is a top view schematically showing the soundproof structure shown in FIG. 4 partially broken.
  • FIG. 6 is a cross-sectional view schematically showing another example of the soundproofing structure used in the soundproofing box of the present invention.
  • FIG. 7 is a top view schematically showing the soundproof structure shown in FIG.
  • FIG. 8 is a cross-sectional view schematically showing another example of the soundproof structure used in the soundproof box of the present invention.
  • the soundproof structure 10A shown in FIGS. 6 and 7 includes a honeycomb core 12 having a plurality of openings 14, a plate-like first surface plate 16 having a plurality of through holes 18, and a second surface plate 20.
  • the soundproof structure 10A shown in FIGS. 6 and 7 includes a honeycomb core 12 having a plurality of openings 14, a plate-like first surface plate 16 having a plurality of through holes 18, and a second surface plate 20.
  • a sound absorber 22 that is, in the soundproof structure 10 shown in FIGS. 4 and 5, the soundproof structure 10A shown in FIGS. 6 and 7 has the sound absorber 22 between the first surface plate 16 and the honeycomb core 12. Therefore, first, the soundproofing structure 10A shown in FIGS. 6 and 7 will be described, and then the soundproofing structure 10 shown in FIGS. 4 and 5 will be described.
  • the soundproof structure 10A shown in FIG. 6 and FIG. 7 is used for the soundproof box 30 and 30A shown in FIG. 1 and FIG.
  • the soundproof structure 10A includes the honeycomb core 12 having the plurality of openings 14, the plate-like first surface plate 16 having the plurality of through holes 18, the second surface plate 20, and the sound absorber 22; Have.
  • the first front plate 16 and the second front plate 20 are arranged to sandwich the honeycomb core 12 with a space therebetween.
  • the first surface plate 16 is bonded to one surface of the honeycomb core 12 via the sound absorber 22.
  • the second surface plate 20 is bonded to the other surface of the honeycomb core 12.
  • the sound absorber 22 is disposed between the first surface plate 16 and the honeycomb core 12 (that is, one surface located on the honeycomb core side of the first surface plate).
  • the sound absorber 22 is composed of a fine through hole plate 26 having a plurality of fine through holes 24.
  • FIG. 7 in order to make the structure of the soundproof structure 10A easy to understand, a portion where the first surface plate 16 and the sound absorbing body 22 (fine through hole plate 26) are broken is shown in Table The part where only the face plate 16 is broken is shown in the middle of FIG.
  • the honeycomb core 12 is disposed between the first front plate 16 and the second front plate 20, is a frame having a plurality of honeycomb cells (frames), and has a plurality of openings 14 penetrating in the thickness direction. Have. That is, each honeycomb cell (frame) has an opening 14 respectively.
  • the plurality of openings 14 of the honeycomb core 12 are closed by the first face plate 16 and the sound absorber 22 arranged on both sides and the second face plate 20. Behind the through holes 18 of the first surface plate 16 and the fine through holes 24 of the fine through hole plate 26 as the sound absorber 22, the opening 14 of the honeycomb core 12 is a closed space, and a rear air layer is formed.
  • the plurality of through holes 18 of the first front plate 16 be disposed corresponding to the plurality of openings 14 of the honeycomb core 12 respectively.
  • the plurality of through holes 18 are also regularly arranged in the first surface plate 16 according to the plurality of openings 14 regularly arranged.
  • the arrangement of the plurality of openings 14 of the honeycomb core 12 and the arrangement of the plurality of through holes 18 of the first surface plate 16 are not limited to those described above.
  • the two or more through holes 18 of the first surface plate 16 may be arranged to correspond to the openings 14 of the honeycomb core 12.
  • the plurality of openings 14 may not be regularly arranged in the honeycomb core 12.
  • the honeycomb core 12 preferably has a honeycomb structure. That is, the shape of the opening 14 is preferably a honeycomb (regular hexagonal) shape in a planar shape, but it is not particularly limited in the present invention.
  • the shape of the opening 14 may be a circle, an ellipse, a square (square), another rectangle such as a rectangle, a rhombus, or a parallelogram, a triangle such as an equilateral triangle, an isosceles triangle, or a right triangle.
  • it may be a polygon including a regular polygon such as a regular octagon, an ellipse or the like, or it may be indeterminate.
  • the diameter (pore diameter or size) of the opening 14 is defined as the distance between opposing sides passing through the center or the equivalent circle diameter.
  • a polygon, an ellipse, or an irregular shape it can be defined as a circle equivalent diameter.
  • the equivalent circle diameter and the radius are respectively the diameter and the radius when converted to a circle having the same area.
  • the diameter (size) of the opening 14 of the honeycomb core 12 is larger than the diameter of the through hole 18 of the first surface plate 16.
  • the diameter of the opening 14 can be said to be the size (for example, the width or the length) of the honeycomb cells of the honeycomb core 12.
  • the diameter of the opening 14 is preferably 1.0 mm to 500 mm, more preferably 5 mm to 250 mm, and particularly preferably 10 mm to 100 mm.
  • the reason why the diameter of the opening 14 is preferably 1.0 mm to 500 mm is that if it is smaller than 1.0 mm, the air viscosity resistance at the side wall of the cylindrical honeycomb core becomes high, and the sound absorption effect is reduced Also, it is difficult to manufacture.
  • the aperture ratio of the openings 14 of the honeycomb core 12 is larger than the aperture ratio of the through holes 18 of the first surface plate 16.
  • the shape and / or diameter of the openings 14 (or honeycomb cells) may be the same and constant in all the openings 14 (or honeycomb cells), but may be different and different sizes ( Openings (frames, honeycomb cells) of which shapes are different may also be included.
  • the planar shape and the size (planar size) of the honeycomb core 12 are not particularly limited, and may be appropriately determined according to the planar shape and the size of the first surface plate 16 or the second surface plate 20. You just have to choose it.
  • the thickness of the honeycomb core 12 is equal to the distance (separation distance) between the sound absorber 22 and the second surface plate 20, but since the thickness of the sound absorber 22 is thin, the first surface plate 16 and the second surface plate 20 Can be said to be approximately equal to the distance between the
  • the thickness of the honeycomb core 12 is not particularly limited, and may be determined or selected depending on the place where the soundproof structure 10A of the present invention is used and the environment.
  • the thickness of the honeycomb core 12 is, for example, preferably 1.0 mm to 200 mm, more preferably 5 mm to 100 mm, and particularly preferably 10 mm to 50 mm.
  • the reason why the thickness of the honeycomb core 12 is preferably 1.0 mm to 200 mm is that the rigidity is greatly reduced when the thickness is less than 1.0 mm, and when the thickness is more than 200 mm, the soundproof structure becomes thicker. However, there is no space for placement.
  • the material of the honeycomb core 12 is lightweight and has high rigidity, and the honeycomb core 12 can support the first surface plate 16 and the sound absorber 22, and the space between the sound absorber 22 and the second surface plate 20 can be obtained. It is not particularly limited as long as the air column resonance structure can be configured together with the first face plate 16, the sound absorber 22, and the second face plate 20 while maintaining the distance constant.
  • the material of the honeycomb core 12 may be, for example, a flammable material or a flame retardant material.
  • the flammable material refers to materials other than the following flame retardant materials, and examples thereof include resin materials such as paper, wood, and synthetic resin. Examples of paper include cardboard, boards and the like.
  • the resin material examples include acrylic resin such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate, polyamideid, polyarylate, polyetherimide, polyacetal, polyetheretherketone, polyphenylene sulfide, polysulfone, poly Examples include butylene terephthalate, polyimide, and triacetyl cellulose.
  • acrylic resin such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate, polyamideid, polyarylate, polyetherimide, polyacetal, polyetheretherketone, polyphenylene sulfide, polysulfone, poly Examples include butylene terephthalate, polyimide, and triacetyl cellulose.
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PET polycarbonate
  • polyamideid polyarylate
  • polyetherimide polyacetal
  • polyetheretherketone polyphenylene sulf
  • a flame retardant material refers to a material other than the above-mentioned combustible material, but in the case of a building material, a non-combustible material defined in Building Standard Act Article 2, Item 9, Building Standard Act Enforcement Order 1 Refers to the quasi-combustible materials specified in item 5 and the flame-retardant materials specified in Article 1 item 6 of the same Article. These materials do not burn for more than 5 minutes after the start of heating when heat from a normal fire is applied, they do not cause deformation, melting, cracking and other damage harmful to fire protection, harmful to evacuation It is necessary to meet three points of not producing smoke or gas.
  • materials such as a metal material, an inorganic material, a flame-retardant plywood, a flame-retardant fiber board, and a flame-retardant plastic board, can be mentioned, for example.
  • a metal material aluminum, steel, titanium, magnesium, tungsten, iron, steel, chromium, chromium molybdenum, nichrome molybdenum, and these alloys etc. can be mentioned, for example.
  • As an inorganic material glass, concrete, a gypsum board, sapphire, ceramics, etc. can be mentioned, for example.
  • it can be used as a flame retardant material by coating a flammable material with an aramid resin or the like.
  • honeycomb core 12 As a material of honeycomb core 12 other than these, the material containing carbon fiber, such as carbon fiber reinforced plastic (CFRP), carbon fiber, and glass fiber reinforced plastic (GFRP), can also be mentioned. In addition, you may use combining the multiple types of material of these honey-comb cores 12. As shown in FIG. It is preferable to use a metal such as aluminum as the material of the honeycomb core 12 because non-combustibility can be imparted and high fire resistance can be obtained. By using a metal or resin as the material of the honeycomb core 12, the rigidity is preferably high. On the other hand, it is preferable to use paper as the material of the honeycomb core 12 because the material can be easily incinerated, easily discarded, and made lighter.
  • CFRP carbon fiber reinforced plastic
  • GFRP glass fiber reinforced plastic
  • the honeycomb core 12 is preferably made of paper, metal, or resin.
  • the thickness of the material of the honeycomb core 12 is such that the honeycomb core 12 is light in weight and has high rigidity, has rigidity capable of supporting the first surface plate 16 and the sound absorber 22, and the sound absorber 22 and Table 2 It is not particularly limited as long as the space between the face plate 20 can be kept constant and the honeycomb core 12 can form an air column resonance structure together with the second face plate 20.
  • the thickness of the material of the honeycomb core 12 is, for example, preferably 0.001 mm (1 ⁇ m) to 5 mm, more preferably 0.01 mm (10 ⁇ m) to 2 mm, and 0.1 (100 ⁇ m) mm to 1 mm Being particularly preferred.
  • the reason why the thickness of the material of the honeycomb core 12 is preferably 0.001 mm (1 ⁇ m) to 5 mm is that if it is less than 0.001 mm (1 ⁇ m), the rigidity decreases. If it exceeds 5 mm, the weight becomes heavy, and the weight merit of the honeycomb is lost.
  • the fixing method of the sound absorbing body 22 and the honeycomb core 12 and the fixing method of the honeycomb core 12 and the second surface plate 20 are as long as the honeycomb core 12 can be fixed to the sound absorbing body 22 and the second surface plate 20. But it is not particularly restrictive.
  • the fixing method may include, for example, a method using an adhesive or a method using a physical fixing tool. In the method of using an adhesive, the adhesive is applied on the both surfaces (of the honeycomb cell) surrounding the opening 14 of the honeycomb core 12 and the sound absorber 22 and the second surface plate 20 are mounted thereon. Place and fix to the honeycomb core 12.
  • epoxy-based adhesive (Araldite (registered trademark) (manufactured by Nichiban Co., Ltd.) and the like)
  • cyanoacrylate-based adhesive (Aron Alpha (registered trademark) (manufactured by Toagosei Co., Ltd. and the like)
  • acrylic An adhesive etc. can be mentioned.
  • the sound absorber 22 or the first face plate 16, the sound absorber 22 and the second face plate 20 which are disposed so as to cover and sandwich the opening 14 of the honeycomb core 12 can be used.
  • a method of holding the fixing member between the honeycomb core 12 and a fixing member such as a rod and fixing the fixing member to the honeycomb core 12 by using a fixing tool such as a screw or a screw can be mentioned.
  • the first surface plate 16 has a plate shape and has a plurality of through holes 18 penetrating in the thickness direction.
  • the first surface plate 16 functions as a protective layer of the sound absorber 22 on the back side of the first surface plate 16 (between the first surface plate 16 and the honeycomb core 12), and this sound absorber 22 is in direct contact with an external object. Contact can be prevented, and mechanical damage to the sound absorber 22 can be suppressed.
  • the first surface plate 16 having the plurality of through holes 18 covers the sound absorber 22. The appearance of the sound absorber 22 can be improved.
  • the through holes 18 of the first surface plate 16 correspond to the openings 14 of the honeycomb core 12.
  • a back air layer in a closed space is formed by the honeycomb core 12 and the second surface plate 20 behind the through holes 18 of the first surface plate 16 and the fine through holes 24 of the sound absorber 22 (fine through hole plate 26). Be done.
  • the honeycomb core 12 forming the through holes 18 and the back air layer behind them and the second surface plate 20 constitute an air column resonance structure.
  • the portion of the first face plate 16 having the holes 18 and the portion of the second face plate 20 corresponding to one opening 14 constitute an air column resonance structure.
  • the through holes 18 of the first face plate 16 are large holes that do not interfere with air column resonance (do not induce Helmholtz resonance).
  • the sound absorbing body 22 does not constitute air column resonance itself, but is for adding resistance to the air column resonance structure to widen a sound absorbing zone.
  • the plurality of through holes 18 may be arranged in the first surface plate 16, it may be regularly arranged according to the plurality of openings 14 of the honeycomb core 12. preferable.
  • One through hole 18 may be provided in the first surface plate 16.
  • the thickness of the first face plate 16 is not particularly limited as long as the sound absorber 22 can be protected.
  • the thickness of the first surface plate 16 is, for example, preferably 0.01 mm to 50 mm, more preferably 0.1 mm to 30 mm, and particularly preferably 1.0 mm to 10 mm.
  • the planar shape and the size (planar size) of the first surface plate 16 are not particularly limited, and may be appropriately determined according to the place where the soundproof structure 10A using the first surface plate 16 is used, the environment, and the like. You just have to choose it.
  • the plurality of through holes 18 of the first surface plate 16 are preferably arranged to correspond to the plurality of openings 14 of the honeycomb core 12 respectively.
  • one through hole 18 of the first surface plate 16 and one opening 14 of the honeycomb core 12 be arranged in one-to-one correspondence.
  • the present invention is not limited thereto, and if it does not disturb the air column resonance constituted by the honeycomb core 12 and the second surface plate 20 (does not induce the Helmholtz resonance), one opening of the honeycomb core 12 Two or more through holes 18 may be provided to 14.
  • the plurality of through holes 18 of the first front plate 16 are preferably regularly arranged, but may be randomly (irregularly) arranged.
  • the shape of the through hole 18 is preferably planar and circular, but is not particularly limited in the present invention.
  • the shape of the through hole 18 may be a square (square), another rectangle such as a rectangle, a rhombus, or a parallelogram, a triangle such as an equilateral triangle, an isosceles triangle or a right triangle, an equilateral pentagon, or an equilateral hexagon It may be a polygon including a regular polygon, or an ellipse or the like, or it may be indeterminate.
  • the diameter of the through hole 18 can be defined in the same manner as the diameter (size) of the opening 14.
  • the diameter of the through hole 18 of the first surface plate 16 is preferably 1.0 mm or more, more preferably 5 mm or more, and still more preferably 10 mm or more.
  • the diameter of the through hole 18 is preferably 100 mm or less, more preferably 50 mm or less, and particularly preferably 25 mm or less.
  • the reason for limiting the preferable range of the diameter of the through hole 18 to 1.0 mm or more is that, when the diameter of the through hole 18 is smaller than 1 mm, the viscous resistance at the side wall of the through hole 18 becomes large. If disposed below the first front plate 16, the acoustic resistance becomes too large, and the sound absorption characteristic is degraded.
  • the reason for limiting the preferable range of the diameter of the through hole 18 to 100 mm or less is because the rigidity of the soundproof structure is lowered when the diameter is larger than 100 mm.
  • the shape and / or diameter of the through holes 18 may be constant in all the through holes 18, but may include frames of different sizes (including different shapes).
  • the diameter of the through hole 18 of the first surface plate 16 is larger than the diameter of the fine through hole 24 of the fine through hole plate 26 which is the sound absorbing body 22, and the penetration of the first surface plate 16 is also possible.
  • the aperture ratio of the holes 18 is larger than the aperture ratio of the fine through holes 24 of the sound absorber 22.
  • the aperture ratio of the through holes 18 of the first surface plate 16 can be defined as the ratio of the area of the through holes 18 to the area of the above-described closed space (back air layer).
  • the aperture ratio of the through holes 18 can be defined as the average aperture ratio of the through holes 18.
  • the average open area ratio of the through holes 18 can be determined as the total area ratio of all the through holes 18 to the area of the entire opening 14 of the honeycomb core 12 (the ratio of the total area of all the through holes 18).
  • the area of the entire opening 14 may be determined from the product of the average diameter and the number and the average diameter and the number of the all openings 14 within a predetermined range of the honeycomb core 12.
  • the area of the holes 18 may be determined from the product of the average diameter and the number by determining the average diameter and the number of all the through holes 18 within a predetermined range of the first surface plate 16.
  • the aperture ratio of the through hole 18 is preferably 1.0% or more, more preferably 5% or more, still more preferably 10% or more, and 20% or more. Particularly preferred.
  • the reason why the aperture ratio is preferably 1.0% or more is that, when the aperture ratio of the through holes 18 of the first surface plate 16 is 1.0% or more, the air weight of the through holes 18 and the honeycomb This is because Helmholtz resonance consisting of an air spring by the core 12 hardly occurs, air column resonance determined by the length of the air column of the honeycomb core occurs, and sound absorption in a wide band becomes possible.
  • an aperture ratio of 5% or more is preferable in order to realize broadband sound absorption.
  • the opening ratio is preferably 90% or less, more preferably 80% or less, still more preferably 70% or less, and particularly preferably 50% or less.
  • the reason why the aperture ratio of the through holes 18 is more preferably 5% or more can be considered as follows.
  • the dependence of the aperture ratio of the normal incidence sound absorption coefficient of the Helmholtz resonance structure as shown in FIG. 9 (the ratio of the area of the through hole to the area of the closed space) is determined by calculation. It was calculated how much the noise level dropped.
  • the Helmholtz resonance structure 28 shown in FIG. 9 is one cell of the soundproof structure 10A shown in FIG. 6 excluding the sound absorber 22 and is one cell of the soundproof structure 10 shown in FIG. Can.
  • the Helmholtz resonance structure 28 has a honeycomb core 12 having an opening 14, a first face plate 16 having a through hole 18, and a second face plate 20.
  • a indicates the radius of the through hole 18
  • w indicates the diameter of the opening 14
  • h indicates the thickness of the first surface plate 16
  • l indicates the thickness of the honeycomb core 12.
  • FIG. 12 One of the results is shown in FIG. 12 as a representative.
  • the noise level decreases rapidly when the aperture ratio reaches 5%. Also, it can be seen that the noise level decreases even though the amount of reduction decreases at 10%. Furthermore, it can be seen that at 20%, the bottom of the reduction amount comes to bottom. The remaining graphs showed similar results.
  • the upper limit of the aperture ratio is better for the muffling effect as the aperture ratio is higher, but if it is too large, the rigidity of the first surface plate is reduced, so 90% or less is preferable and 70% or less is more preferable. And 50% or less at which the muffling effect is saturated is most preferable.
  • the calculation method is as follows. Assuming that the acoustic impedance of the Helmholtz resonance structure 28 is Zh, it can be expressed by the following equation (1).
  • R is the acoustic resistance in the through hole 18, and was set so that the sound absorption coefficient is 99% at the time of resonance (the imaginary part is 0).
  • h ′ is the thickness of the first surface plate 16 including the open end correction of the through hole 18. Also, ⁇ is the air density, c is the speed of sound, l is the length of the back space, and ⁇ is the angular frequency.
  • the first term of the imaginary part indicates the inductance of the through hole 18, and the second term indicates the capacitance of the closed space.
  • the normal incidence sound absorption coefficient ⁇ was calculated from the following equation (2).
  • Z air c c, ⁇ : density of air, c: sound velocity
  • the noise level was calculated by changing the noise absorption effect.
  • the sound absorbing body 22 can be protected, and sound absorption is performed between the honeycomb core 12 and the first surface plate 16 so that the sound absorbing body 22 is supported on one surface of the honeycomb core 12.
  • the material is not particularly limited as long as the body 22 can be held and the distance between the body 22 and the second surface plate 20 can be maintained constant, and the same material as the honeycomb core 12 can be used.
  • the first surface plate 16 protects the sound absorber 22, and the honeycomb core 12 and the second surface plate 20 are formed behind the through holes 18 of the first surface plate 16. It is sufficient if the air column resonance structure can be configured by
  • the first front plate 16 is preferably made of paper, metal or resin.
  • the second surface plate 20 is spaced apart from the first surface plate 16 on the other surface of the honeycomb core 12 (the lower surface in FIG. 6; ie, the surface opposite to the side on which the sound absorber 22 is provided). Be done.
  • the second surface plate 20 is for sealing the other side (the lower side in FIG. 6) of the plurality of openings 14 of the honeycomb core 12, and the sound absorber 22 and the first surface plate 16 are interposed therebetween. It is for holding the honeycomb core 12.
  • the thickness of the second surface plate 20 is not particularly limited as long as the sound absorber 22 and the honeycomb core 12 can be supported between the second surface plate 20 and the first surface plate 16, but for example, 0.1 mm to 100 mm is preferable.
  • planar shape and the size (planar size) of the second surface plate 20 are not particularly limited, depending on the planar shape, the size, etc. of the first surface plate 16 or the sound absorber 22 and the honeycomb core 12. It may be determined appropriately and may be selected.
  • the material of the second surface plate 20 is not particularly limited as long as the sound absorber 22 and the honeycomb core 12 can be held between the first surface plate 16 and the same material as the first surface plate 16 is used. be able to.
  • various metals such as paper, aluminum, and iron, and various resin materials such as polyethylene terephthalate (PET) can be used.
  • PET polyethylene terephthalate
  • the second front plate 20 is preferably made of paper, metal or resin.
  • the second surface plate 20 may be a component member or wall or the like of various devices on which a soundproof structure is installed as long as the sound absorber 22 and the honeycomb core 12 can be sandwiched between the second surface plate 20 and the first surface plate 16. Good.
  • the surface of the honeycomb core 12 opposite to the surface on which the first surface plate 16 is disposed may be used as the second surface plate 20 by arranging the frame so as to be in contact with the wall.
  • the honeycomb core 12 and the second surface plate 20 may be integrated.
  • the sound absorber 22, the honeycomb core 12 and the second surface plate 20 may be integrated.
  • a member or the like in which the honeycomb core 12 and the second surface plate 20 are integrated can be manufactured, for example, by a 3D printer.
  • the member in which the sound absorber 22, the honeycomb core 12 and the second surface plate 20 are integrated is, for example, a member forming the sound absorber 22, the honeycomb core 12 and the second surface plate 20 integrally molded by a 3D printer. As will be described later, it can be manufactured by forming the fine through holes 24 in the member forming the sound absorber 22 with a laser.
  • the sound absorber 22 is disposed in contact with one surface (upper surface in FIG. 6) of the honeycomb core 12 and the other main surface (lower surface in FIG. 6) of the first surface plate 16. 1 is sandwiched between the surface plate 16 and the honeycomb core 12.
  • the sound absorber 22 functions as an air column resonance structure in the closed space behind a plurality of fine through holes of the sound absorber 22 formed by the sound absorber 22 itself, the honeycomb core 12 and the second surface plate 20. is there.
  • the sound absorber 22 is preferably a fine through hole plate or a film having a plurality of fine through holes.
  • the sound absorber 22 may be a sound absorber made of woven fabric, knitted fabric, non-woven fabric, or a fiber such as felt, a porous material such as urethane, a through hole plate with a through hole, and the like.
  • the sound absorbing body 22 is disposed between the first surface plate 16 and the honeycomb core 12, and only one surface (lower surface in FIG. 6) located on the honeycomb core 12 side of the first surface plate 16
  • the present invention is not limited to this, and may be disposed on both surfaces of the first face plate 16.
  • the sound absorber 22 is constituted by a fine through hole plate 26 having a plurality of fine through holes 24 penetrating in the thickness direction.
  • the plurality of fine through holes 24 of the fine through hole plate 26 preferably have an average diameter of 1.0 ⁇ m to 250 ⁇ m.
  • the fine through holes 24 may be perforated regularly or randomly in the fine through hole plate 26 in shape, size (diameter) and arrangement.
  • the diameter of the fine through holes 24 can be defined in the same manner as the diameter of the through holes 18.
  • the reason why the average diameter of the fine through holes 24 is preferably 1.0 ⁇ m to 250 ⁇ m is that if the average diameter is less than 1.0 ⁇ m, the acoustic resistance is too large and the sound absorption characteristics are deteriorated. This is because when it exceeds 250 ⁇ m, the inductance of the fine through holes 24 increases and the band narrows.
  • the sound absorber 22 may be a film-like film or a fibrous film as long as it has a plurality of fine through holes 24 penetrating in the thickness direction. In the case of a fibrous film, the space between the fibers can be regarded as a fine through hole 24.
  • the fine through-hole plate 26 may be a film of fibers themselves as it may be regular or random in the fine through-holes 24, and is a woven or non-woven fabric having various weaves, good.
  • the sound absorbing body 22 composed of the fine through hole plate 26 is more preferable because a high sound absorbing effect can be obtained even in a thin state.
  • the shape of the fine through hole 24 is planar and circular, it is not particularly limited in the present invention.
  • the shape of the micro through hole 24 may be a rectangle, a rhombus, or another quadrilateral such as a parallelogram, a regular triangle such as an equilateral triangle, an isosceles triangle or a right triangle, a regular pentagon, or a regular hexagon. It may be a polygon including or oval or the like, or may be indeterminate.
  • the soundproof structure 10A has a first surface plate 16 having a through hole 18 and an air column resonance structure formed by a honeycomb core 12 and a second surface plate 20 behind a sound absorber 22 consisting of a fine through hole plate 26. While improving the sound absorption performance, the effect of broadening the sound absorption frequency is achieved.
  • the average diameter of the plurality of fine through holes 24 formed in the fine through hole plate 26 is 0.1 ⁇ m or more and less than 100 ⁇ m, and the average aperture ratio of the fine through holes 24 is in the following range. In some cases, even if there is no resonance structure formed by the first surface plate 16 having the through holes 18, the honeycomb core 12, and the second surface plate 20 alone, the fine through hole plate 26 alone has high sound absorption. It can function as a soundproof structure that produces an effect.
  • the fine through hole plate 26 has fine through holes 24 with an average diameter of 0.1 ⁇ m or more and less than 100 ⁇ m with an average aperture ratio in the above range, so that inside of the fine through holes 24 when sound passes through the fine through holes 24. Sound is absorbed by the friction between the wall and air. That is, the fine through hole plate 26 is a closed space of the air layer behind the resonance structure formed by the first surface plate 16 having the through holes 18, the fine through hole plate 26 itself, the honeycomb core 12, and the second surface plate 20. Sound absorption by resonance with the sound absorption with a mechanism that is not resonance can be performed together.
  • the sound absorption in the fine through hole plate 26 is a sound absorption effect by air column resonance that causes the resonance between the air layer in the fine through hole 24 and the air layer in the closed space, and The friction between the air and the inner wall surface of the fine through hole 24 when the air passes is used together with the sound absorption effect.
  • the sound absorbing mechanism of the sound absorbing body 22 itself comprising the fine through hole plate 26 is to the thermal energy of the energy of the sound due to the friction between the inner wall surface of the fine through hole 24 and the air when the sound passes through the fine through hole 24 Estimated to be a change in This mechanism is different from the mechanism by resonance because it is caused by the fine size of the fine through holes 24.
  • a path that passes directly as a sound in air by the fine through holes 24 has a much smaller acoustic impedance than a path that is once converted to film vibration and then emitted again as a sound. Therefore, the sound is more likely to pass through the path of the fine through holes 24 than the membrane vibration.
  • the sound When passing through the fine through hole portion, the sound is concentrated and passed from the entire wide area on the fine through hole plate 26 to the narrow area of the fine through hole 24.
  • the local velocity is extremely increased by the collection of sounds in the minute through holes 24.
  • the friction As the friction is correlated with the speed, the friction increases in the fine through holes 24 and is converted to heat.
  • the average diameter of the fine through holes 24 is small, the ratio of the edge length of the fine through holes 24 to the opening area is large, so that the friction generated at the edges and the inner wall surface of the fine through holes 24 can be increased. Conceivable.
  • an optimum ratio exists to the average aperture ratio of the fine through holes 24.
  • the average diameter is relatively large such as about 50 ⁇ m or more
  • the smaller the average aperture ratio the higher the absorption rate.
  • the average aperture ratio is large, the sound passes through each of the many fine through holes 24, whereas when the average aperture ratio is small, the number of the fine through holes 24 decreases, so one fine The sound passing through the through hole 24 increases, and the local velocity of air passing through the fine through hole 24 is further increased, and the friction generated at the edge and the inner wall surface of the fine through hole 24 can be further increased.
  • the size can be freely set. For this reason, in the minute through holes 24 of the minute through hole plate 26 disposed on the upper side in FIG. 6 of the first surface plate 16 when the sound absorbers 22 are disposed on both surfaces of the first surface plate 16. It is valid. Further, as described above, since the sound absorption by the fine through holes 24 is absorbed by the friction when the sound passes through the fine through holes 24, the sound can be absorbed regardless of the frequency band of the sound, and the sound is absorbed in a wide band Can.
  • the degree of freedom in selecting the material of the fine through hole plate 26 is high, and the problems of environmental pollution and environmental performance are also Problems can be reduced because materials can be selected together.
  • the fine through hole plate 26 has the fine through holes 24, even if a liquid such as water adheres to the fine through hole plate 26, the surface tension prevents water from avoiding the fine through holes 24. Since the fine through holes 24 are not closed, the sound absorption performance is unlikely to be reduced. Further, since the fine through hole plate 26 is a thin layered film, it can be curved according to the place to be arranged.
  • the upper limit value of the average diameter of the fine through holes 24 is less than 100 ⁇ m, preferably 80 ⁇ m or less, more preferably 70 ⁇ m or less, still more preferably 50 ⁇ m or less, and most preferably 30 ⁇ m or less. This is because the smaller the average diameter of the fine through holes 24, the larger the ratio of the length of the edge of the fine through holes 24 contributing to the friction to the opening area of the fine through holes 24, and the friction It is because it becomes easy to occur. Moreover, 0.5 micrometer or more is preferable, as for the lower limit of an average diameter, 1.0 micrometer or more is more preferable, and 2 micrometers or more are still more preferable. If the average diameter is too small, the viscous resistance at the time of passing through the fine through holes 24 is too high to pass sound sufficiently, so that even if the aperture ratio is increased, sufficient sound absorbing effect can not be obtained.
  • the average opening rate rho of the fine through holes 24 is the average opening rate of the fine through holes 24
  • the average aperture ratio rho is preferably in the range of rho_center ⁇ 0.050 ⁇ (phi / 30) ⁇ 2 or more, rho_center + 0.505 ⁇ (phi / 30) ⁇ 2 or less, and rho_center ⁇ 0.048 ⁇ (phi / 30) ⁇ 2 or more
  • the range of (rho_center ⁇ 0.24 ⁇ (phi / 10) ⁇ 2 ) or more and (rho_center + 0.57 ⁇ (phi / 10) ⁇ 2 ) or less is particularly preferable, and (rho_center ⁇ 0.185 ⁇ (phi / 10) ⁇ 2 ) or more,
  • the average opening of the fine through holes 24 is to optimize the sound absorption coefficient of the sound absorbing body 22 alone (absorptivity when sound passes through the sound absorbing body 22).
  • optimizing the sound absorption coefficient of the sound absorber 22 alone results in obtaining high acoustic resistance in the sound absorber 22.
  • the average diameter of the fine through holes 24 is obtained by photographing the surface of the sound absorbing body 22 at a magnification of 200 times using a high resolution scanning electron microscope (SEM) from the surface side of the sound absorbing body 22. Then, 20 fine through holes 24 whose circumferences are annularly connected are extracted, their diameters are read, and their average value is calculated as an average diameter. If the number of micro through holes 24 is less than 20 in one SEM photograph, SEM photographs are taken at another position around the periphery and counted until the total number reaches 20. In addition, a diameter measured the area of the part of the fine through-hole 24, respectively, and evaluated using the diameter (circle equivalent diameter) when replacing with the circle used as the same area.
  • SEM scanning electron microscope
  • the shape of the opening of the fine through hole 24 is not limited to a substantially circular shape, when the shape of the opening is non-circular, the diameter of the circle having the same area was evaluated. Therefore, for example, even in the case of a fine through hole having a shape in which two or more fine through holes are integrated, this is regarded as one fine through hole 24 and the circle equivalent diameter of the fine through hole 24 is the diameter.
  • the circle equivalent diameter, the aperture ratio and the like can all be calculated by Analyze Particles using “Image J” (https://imagej.nih.gov/ij/).
  • the average aperture ratio is obtained by photographing the surface of the sound absorber 22 at a magnification of 200 times from directly above using a high resolution scanning electron microscope (SEM), and the field of view of 30 mm ⁇ 30 mm of the obtained SEM photograph (5 places) Of the fine through holes 24 and the non-fine through holes are binarized with image analysis software etc., and the ratio from the total of the open areas of the fine through holes 24 and the area of the field of view (geometrical area) It calculates from (opening area / geometrical area), and calculates the average value in each visual field (five places) as an average aperture ratio.
  • SEM scanning electron microscope
  • the plurality of fine through holes 24 may be formed of fine through holes 24 of one type of diameter as long as the average diameter is 1.0 ⁇ m to 250 ⁇ m, and fine through holes 24 of two or more types of diameters. It may consist of From the viewpoint of productivity, the viewpoint of durability, etc., it is preferable to be composed of fine through holes 24 of two or more diameters. As for the productivity, if the variation in diameter is allowed from the viewpoint of performing a large amount of etching processing, the productivity is improved. Also, from the viewpoint of durability, the size of dust and dirt varies depending on the environment, so if it is a fine through-hole with a single diameter, all fine through-holes when the size of the main dust roughly matches the fine through-hole It will affect the holes. By providing micro through holes of a plurality of different diameters, the device can be applied in various environments.
  • the dust passing through the outermost surface of the fine through hole is caught in the small diameter part of the inside, compared to the fact that the dust tends to remain as it is.
  • the shape with the largest diameter at the above functions advantageously in the suppression of dust clogging.
  • the largest diameter is "largest diameter> dust size> other surface"
  • the inner wall surface of the fine through holes is preferably roughened.
  • the surface roughness Ra of the inner wall surface of the fine through hole is preferably 0.1 ⁇ m or more, more preferably 0.1 ⁇ m to 10.0 ⁇ m, and 0.2 ⁇ m or more and 1.0 ⁇ m or less Is more preferred.
  • the surface roughness Ra can be measured by measuring the inside of the fine through holes with an AFM (Atomic Force Microscope).
  • AFM Anatomic Force Microscope
  • SPA300 manufactured by Hitachi High-Tech Science Co., Ltd.
  • the cantilever can be measured in DFM (Dynamic Force Mode) mode using OMCL-AC200TS. Since the surface roughness of the inner wall surface of the fine through hole is about several microns, it is preferable to use AFM in terms of having a measurement range and accuracy of several microns.
  • the average particle diameter of the convex portion by regarding each of the convex portions of the unevenness in the fine through hole as particles.
  • an SEM image field of view of about 1 mm ⁇ 1 mm
  • yen which becomes the same area as each area is calculated
  • the average particle diameter of the convex portion is preferably 0.1 ⁇ m or more and 10.0 ⁇ m or less, and more preferably 0.15 ⁇ m or more and 5.0 ⁇ m or less.
  • the ventilation flow resistance of the sound absorber 22 is preferably 10 to 50000 Rayls, more preferably 50 to 10000 Rayls, and 100 to 2000 Rayls. Is most preferred.
  • the sound absorption coefficient (viscous resistance) optimum for the first surface plate 16 having a small diameter of the through hole 18 and a small aperture ratio can be obtained at 10 Rays or more, but there is almost no resistance if it is smaller. On the other hand, when it exceeds 50000 Rayls, the resistance is too large and reflection mainly occurs to reduce the sound absorption effect.
  • the thickness of the fine through hole plate 26 which is the sound absorbing body 22 is not limited. However, since the friction energy received when the sound passes through the fine through hole 24 increases with the thickness, the sound absorbing performance is further improved. Conceivable. Moreover, when it is extremely thin, it is difficult to handle it and it is easy to break it. On the other hand, it is preferable that the miniaturization, the air permeability and the light transmission be thin. In the case of using etching or the like for the method of forming the fine through holes 24, the longer the thickness, the longer the preparation time, and the thinner is desirable from the viewpoint of productivity.
  • the thinner one is preferable. Therefore, 50 mm or less is preferable, as for the thickness of the sound absorbing body 22, 20 mm or less is more preferable, and 10 mm or less is still more preferable. On the other hand, if the thickness of the sound absorbing body 22 is too thin, the sound absorbing body 22 is susceptible to mechanical damage, so it is preferably 0.1 ⁇ m or more, more preferably 1.0 ⁇ m or more, and 10 ⁇ m or more.
  • the distance between the first front plate 16 and the second front plate 20 becomes longer by the thickness of the sound absorber 22, so a low frequency and a wide band can be obtained. It can absorb sound.
  • the planar shape and the size (planar size) of the sound absorber 22 are not particularly limited, and may be appropriately determined according to the planar shape of the first front plate 16, the size, etc., and may be selected appropriately. .
  • the sound absorbing body 22 is a film-like (film-like) fine through hole plate 26 having a plurality of fine through holes 24
  • the material of such a fine through hole plate 26 is not particularly limited, and the same material as the material of the honeycomb core 12 can be used.
  • the material of the sound absorber 22 is, for example, aluminum, titanium, nickel, permalloy, 42 alloy, kovar, nichrome, copper, beryllium, phosphor bronze, brass, nickel, tin, zinc, iron, tantalum, niobium, molybdenum, zirconium , Metals such as gold, silver, platinum, palladium, steel, tungsten, lead, stainless steel, and iridium; alloy materials based on those metals; PET (polyethylene terephthalate), TAC (triacetyl cellulose), polyvinylidene chloride, polyethylene, Polyvinyl chloride, polymethylbenzene, COP (cycloolefin polymer), polycarbonate, zeonoa, PEN (polyethylene naphthalate), polypropylene, and polyimide, ABS resin (acrylonitrile (Acrylonitrile), butadiene (Butadiene), styre (Styrene) copoly
  • the material of the sound absorber 22 is preferably a flame retardant material particularly when the first surface plate 16, the second surface plate 20, and the honeycomb core 12 are made of a flammable material such as paper.
  • the flame retardant material is more preferably a metal material. That is, it is more preferable to use a metal material from the viewpoints of high flame retardancy, high Young's modulus, low vibration even when the thickness is thin, and the effect of sound absorption by friction in fine through holes is easily obtained.
  • copper, nickel, stainless steel, titanium and aluminum are more preferable from the viewpoint of cost and availability.
  • the average diameter of the fine through holes may be adjusted to a smaller range by metal plating at least on the inner surface of the fine through holes.
  • a conductive material such as a metal material which is not electrically charged as a material of the sound absorber 22
  • fine dust, dust and the like are not attracted to the film by static electricity, and the fine through hole plate 26 It is possible to suppress that the sound absorption performance is reduced due to dust, dirt and the like being clogged in the through hole 24.
  • heat resistance can be made high by using a metal material as a material of a fine through-hole board.
  • ozone resistance can be enhanced.
  • an electromagnetic wave can be shielded.
  • the metal material has a large reflectance to radiant heat by far infrared rays
  • the metal material is used as a material of the fine through-hole plate to also function as a heat insulating material for preventing heat transfer by the radiant heat.
  • the fine through hole plate functions as a reflective film because the diameter of the fine through holes is small.
  • a structure in which a plurality of fine through holes are opened in metal is known to function as a high pass filter of frequency. For example, a window with a metal mesh of a microwave oven has a property of shielding visible light that is high frequency while passing microwaves used in the microwave oven.
  • Radiant heat is a heat transfer mechanism in which far infrared rays are emitted from an object in accordance with the object temperature and transmitted to another object.
  • the average diameter of the fine through holes formed in the fine through hole plate is preferably 20 ⁇ m or less.
  • a resin material or glass material that can be made transparent can be used.
  • a PET film has relatively high Young's modulus among resin materials, is easily available, and has high transparency, so that fine through holes can be formed to provide a suitable soundproof structure.
  • the micro through-hole plate is appropriately subjected to surface treatment (plating treatment, oxide film treatment, surface coating (fluorine, ceramic), etc.) according to the material to improve the durability of the micro through-hole plate. be able to.
  • an oxide film can be formed on the surface by performing an alumite treatment (anodic oxidation treatment) or a boehmite treatment. By forming an oxide film on the surface, corrosion resistance, abrasion resistance, abrasion resistance and the like can be improved. Further, by adjusting the treatment time and adjusting the thickness of the oxide film, it is possible to adjust the color tone by optical interference.
  • coloring, decoration, decoration, design, etc. can be given to a fine through-hole board.
  • an appropriate method may be selected depending on the material of the fine through hole plate and the state of surface treatment. For example, printing using an inkjet method can be used.
  • coloring with high durability can be performed by performing a color alumite process.
  • the color alumite treatment is a treatment in which the surface is subjected to alumite treatment, then impregnated with a dye, and then the surface is sealed. By this, it can be set as the fine through-hole board with high designability, such as the presence or absence and color of metallic luster.
  • the anodized film is formed only on the aluminum portion, so that the dye covers the fine through holes and the decoration is performed without reducing the sound absorption characteristics. It can be performed.
  • various colors and designs can be added.
  • the fine through hole plate may be a fiber itself or a fibrous membrane such as a non-woven fabric.
  • the spaces between the fibers can be regarded as through holes.
  • the fibers are irregularly overlapped, and in the case of the non-woven fabric, the fibers are irregularly woven, so the fibers are not parallel or orthogonal to each other.
  • a through hole is formed in the space surrounded by Accordingly, the fiber diameter and the density determine the average diameter and the average opening ratio of the fine through holes.
  • a fine through-hole board is a fibrous film
  • 100 micrometers or less are more preferable.
  • the fiber diameter of the fibrous film is usually about several tens of ⁇ m. Therefore, many yarns will not be laminated
  • the material of the fibrous film includes aramid fiber, glass fiber, cellulose fiber, nylon fiber, vinylon fiber, polyester fiber, polyethylene fiber, polypropylene fiber, polyolefin fiber, rayon fiber, low density polyethylene resin fiber, ethylene vinyl acetate resin fiber , Fiber made of resin material such as synthetic rubber fiber, copolyamide resin fiber, copolyester resin fiber, etc .; paper (tissue paper, Japanese paper etc.); SUS fiber (stainless fiber sheet manufactured by Yodogawa Paper Co., Ltd. "Tomy Fileck” Fibers made of a metal material such as “SS” etc.); fibers of a carbon material, fibers of a carbon-containing material, and the like.
  • the absorption characteristic in the present invention is generated when sound passes through the fine through holes, the acoustic characteristics hardly change even if the material of the fibrous member changes.
  • the material can be selected freely.
  • it can also select according to characteristics other than an acoustic characteristic. For example, if heat resistance is required, a metal material can be selected, and if weight reduction is required, a plastic material can be selected.
  • the sound absorber 22 and the first front plate 16 may be disposed in contact with each other, but it is preferable that they be adhered and fixed. By bonding and fixing the sound absorber 22 and the first surface plate 16, the rigidity of the sound absorber 22 can be made higher, and the resonance vibration frequency can be made higher.
  • the adhesive used to bond and fix the sound absorber 22 and the first surface plate 16 may be selected according to the material of the sound absorber 22 and the material of the first surface plate 16 or the like.
  • epoxy-based adhesive Aldite (registered trademark) (manufactured by Nichiban Co., Ltd.) and the like
  • cyanoacrylate-based adhesive Aron Alpha (registered trademark) (manufactured by Toagosei Co., Ltd. and the like)
  • acrylic A system adhesive etc. can be mentioned.
  • the sound absorber 22 have a deodorizing function.
  • a deodorizing function in the case where the sound absorbing body 22 is a fibrous film, a fine through hole plate, or a porous material, it is sufficient to impregnate the deodorant in each of the fibers.
  • a deodorant a well-known deodorant can be used.
  • Deodorants include, for example, odor-free air and cloth deodorant mist made by Kobayashi Pharmaceutical Co., Ltd., Orbuse's Revenge Natural Caribbean Rush Up Spray (CR-TN012), Goodwill Biol Will Clear Spray E483184H) and the like.
  • the soundproof structure 10 shown in FIGS. 4 and 5 includes a honeycomb core 12 having a plurality of openings 14, a plate-like first surface plate 16 having a plurality of through holes 18, and a second surface plate 20.
  • the soundproof structure 10 shown in FIG. 4 and FIG. 5 is the soundproof structure 10A shown in FIG. 6 and FIG. 7 with the sound absorber 22 between the first front plate 16 and the honeycomb core 12 removed. Therefore, only differences from the soundproof structure 10A will be described below.
  • the first front plate 16 and the second front plate 20 are arranged to sandwich the honeycomb core 12 with a space therebetween.
  • the first surface plate 16 is directly bonded to one surface of the honeycomb core 12.
  • the second surface plate 20 is bonded to the other surface of the honeycomb core 12.
  • ruptured the 1st face plate 16 is shown on the left side of FIG.
  • the thickness of the honeycomb core 12 is equal to the distance (separation distance) between the first front plate 16 and the second front plate 20. Moreover, as a material of the honeycomb core 12 in the soundproof structure 10, it is lightweight and has high rigidity, and the honeycomb core 12 can support the first surface plate 16, and the first surface plate 16 and the second surface plate 20 If the Helmholtz resonance structure or the air column resonance structure can be configured according to the diameter of the through hole 18 of the first surface plate 16 together with the first surface plate 16 and the second surface plate 20, It is not particularly limited.
  • the thickness of the material of the honeycomb core 12 is such that the honeycomb core 12 is light in weight and has high rigidity, has rigidity capable of supporting the first surface plate 16, and the first surface plate 16 and the second surface plate 20
  • the honeycomb core 12 together with the first face plate 16 and the second face plate 20 has a Helmholtz resonance structure or air column according to the diameter of the through hole 18 of the first face plate 16. It is not particularly limited as long as the resonant structure can be configured.
  • the first surface plate 16 and the honeycomb core 12 are preferably fixed without a gap.
  • the method of fixing the first surface plate 16 and the honeycomb core 12 may be the same as the method of fixing the honeycomb core 12 and the second surface plate 20.
  • the adhesive is applied on both sides of the surface (of the honeycomb cell) surrounding the opening 14 of the honeycomb core 12, and the first surface plate 16 and the second surface plate 20 are formed thereon. Place and fix to the honeycomb core 12.
  • the through holes 18 of the first surface plate 16 correspond to the openings 14 of the honeycomb core 12. Behind the through holes 18 of the first face plate 16, the first face plate 16, the honeycomb core 12, and the second face plate 20 form a back air layer in the closed space.
  • the first surface plate 16, the honeycomb core 12, and the second surface plate 20 that form the through holes 18 and the back air layer behind them form a Helmholtz resonance structure or an air column resonance structure. That is, the portion of the honeycomb core 12 having one opening 14, the portion of the first surface plate 16 having one through hole 18 corresponding to one opening 14, and the second surface plate 20 corresponding to one opening 14.
  • the part of “(i)” constitutes a Helmholtz resonance structure or a column resonance structure.
  • a soundproof structure 10B shown in FIG. 8 includes a honeycomb core 12 having a plurality of openings 14, a plate-shaped first surface plate 16 having a plurality of through holes 18, a second surface plate 20, and a sound absorber 22. And urethane 27. That is, in the soundproof structure 10 shown in FIG. 4 and FIG. 5, the soundproof structure 10A shown in FIG. 8 has urethane 27 as a sound absorber 22 on the surface of the first surface plate 16 (surface opposite to the honeycomb core 12). It is possessed. Therefore, only differences from the soundproof structure 10 will be described below.
  • the soundproof structure 10B shown in FIG. 8 has the urethane 27 as the sound absorber 22 on the surface of the first face plate 16 (the surface opposite to the honeycomb core 12). It is possible to widen the soundproof frequency band.
  • non-woven fabric, woven cloth, knitted fabric, gypsum board, felt or the like can be mentioned.
  • the urethane 27 is fixed to the surface of the first surface plate 16 by the same method as the method of fixing the first surface plate 16 to the honeycomb core 12 and the method of fixing the honeycomb core 12 to the second surface plate 20. It should be a method.
  • fine through hole plates 26 shown in FIGS. 6 and 7 may be used as the sound absorber 22 instead of the urethane 27. When the fine through hole plate 26 is used, the same effect as the soundproof structure 10A shown in FIG. 6 and FIG. 7 can be obtained.
  • the soundproof structure 11 constituting the soundproof wall 36 As shown in FIG. 13, it has a honeycomb core 12 having a plurality of openings 14 and two second surface plates 20 sandwiching the honeycomb core. Since the soundproof structure 11 is also low in soundproof performance, it is thin, light in weight, and high in rigidity, so the soundproof wall 36 is thin, strong and light in weight. Therefore, the soundproof box 30, which is composed of the soundproof walls 32, 34, and 36, each of which is thin, light and has high rigidity, 10, 10A and 11, is thin, strong and light. In order to provide soundproofing performance to the soundproofing structure 11, as the soundproofing structure 11A shown in FIG.
  • the sound absorber 22 on the surface (surface opposite to the honeycomb core 12) of one second surface plate 20.
  • Urethane 27 may be installed.
  • the soundproofing structure 11A by having the urethane 27 or the like on the surface of the second surface plate 20, it is possible to impart and improve the soundproofing performance as in the soundproofing structure 10B shown in FIG.
  • the soundproof structure 11A In order to absorb sound, it is necessary to thicken the sound absorber 22 and the volume in the soundproof box is reduced. Therefore, as shown in FIG. 4 and FIG. 5, the first surface plate 16 with the through holes 18 opened is It is preferable to use the soundproof structure to be used as a soundproof wall.
  • the soundproofing structure used in the present invention can also be used as a soundproofing member combining two or more kinds of soundproofing walls having a soundproofing structure having different frequency characteristics as described below, in addition to the above.
  • Soundproofing materials for building materials Soundproofing materials used for building materials
  • Soundproofing members for air conditioning equipment Soundproofing members installed in ventilation openings and air conditioning ducts to prevent external noise
  • Soundproof member for external opening A soundproof member installed in the window of a room to prevent noise from indoor or outdoor
  • Soundproofing material for ceiling A soundproofing material installed on the ceiling of the room to control the sound in the room
  • Floor soundproofing members Soundproofing members installed on the floor that control the sound in the room
  • Soundproofing members for internal openings Soundproofing members installed on indoor doors or bran to prevent noise from each room
  • Soundproofing material for toilets Installed in the toilet or in the door (outdoor), a soundproofing material to prevent noise from the toilet
  • Interior adjustment members soundproof members for controlling the sound of a room
  • Simple soundproof room member A soundproof member that can be easily assembled and moved easily Soundproof room for pets: A soundproofing unit that encloses the pet room and prevents noise.
  • Amusement facilities Soundproof members installed in game centers, sports centers, concert halls, movie theaters, etc.
  • Soundproofing members for temporary construction enclosures Soundproofing members that cover the construction site and prevent noise from leaking around
  • Soundproofing members for tunnels Soundproofing members installed in a tunnel to prevent noise leaking to the inside and the outside of the tunnel can be mentioned.
  • the soundproof structure of the first embodiment of the present invention is basically configured as described above.
  • the soundproof box 30 As shown in FIGS. 1 and 2, in the soundproof box 30 according to the present invention, a soundproof structure 10 having different frequency characteristics, and two soundproof walls 32 and 34 having 10A are disposed facing each other. Four soundproof walls 36 having 11 are added to form a rectangular parallelepiped shape. For this reason, the soundproof box 30 of the present invention is thin and light, and can obtain high soundproofing performance in a wide range of high rigidity and high frequency. Thus, in the soundproof box 30, when the soundproof structure 10 having different frequency characteristics and the two soundproof walls 32 and 34 having 10A are disposed facing each other, high soundproof performance in a wide frequency band is achieved. It is preferable to arrange so as to exhibit sound absorption characteristics as shown in FIG.
  • the sound absorption coefficient of the sound barrier having low frequency absorption peak (f1) is 10%.
  • the high frequency side frequency (f2) is lower than the high frequency absorption peak frequency (f3), and the sound absorption coefficient of the soundproof wall having this absorption peak is 10% low frequency side frequency (f4) Or more) is preferable.
  • this frequency (f4) is more than the absorption peak (f1) of a low frequency. That is, it is preferable to satisfy the following formula (3).
  • the sound absorption coefficient of the sound barrier having a low frequency absorption peak (f1) for determining the frequency (f2) is more preferably 25%, most preferably 50%.
  • the sound absorption coefficient of the sound barrier having the high frequency absorption peak frequency (f3) for determining the frequency (f4) is more preferably 25%, and most preferably 50%.
  • the soundproof structure 10 of the two soundproof walls 32 and 34 and the second surface plate 20 of 10A are front side (outside) Therefore, the first face plate 16 is bonded so as to be on the back side (inner side). That is, both sides of the soundproof structure 10 of the two soundproof walls 32 and 34 and the first face plate 16 of 10A are the side surfaces of the soundproof structure 11 of the two soundproof walls 36 (the second faceboard 20, the honeycomb core 12, and (2) Each side end of the face plate 20 is adhered and fixed to form four side walls of a rectangular parallelepiped. Next, the four sound barriers 32, 34, 36 constituting the four sides of the rectangular parallelepiped shown in FIG.
  • the soundproof structures 10, 10A, 11 are preferably fixed using an adhesive as in the case of fixing the honeycomb core 12 and the second surface plate 20, etc., but it is possible to use a physical fixing tool. Any fixing method may be used. As described above, by arranging the soundproof box 30 having six rectangular walls to cover the noise source, a high soundproof effect can be obtained in a wide band.
  • soundproof box 30 uses soundproof walls including two or more soundproof walls having a soundproof structure having frequency characteristics different from each other for the six sides of the rectangular parallelepiped
  • soundproof walls may be used on five side walls of a rectangular parallelepiped to cover the noise source, or soundproof walls may be used on four sides of the rectangular parallelepiped so as to surround the noise source.
  • one or more openings may be provided on the wall of one surface as an entrance and exit in the soundproof structure 10A.
  • an opening (not shown) for intake and exhaust may be provided.
  • the soundproof box 30 can be used for a pet cabin or the like. Further, attaching a handle (not shown) to the soundproof box 30 makes it possible to carry a lightweight soundproof box, which is preferable. That is, it is preferable because the handle functions as a portable soundproof box such as a pet gauge.
  • the soundproof box 30 described above has a rectangular parallelepiped shape, the present invention is not limited to this, and as long as it has a box shape, it may have a cubic shape or any other hexahedron shape. In addition, it may be a polyhedron shape such as a tetrahedron shape, a pentahedron shape, or an octahedron shape.
  • the soundproof box of the present invention is basically configured as described above.
  • Example 1 Examples of the soundproof structure of the soundproof wall used for the soundproof box used in the present embodiment are shown in FIGS. 13, 14, 4 and 6.
  • Structural example 1 is a soundproof structure 11 in which a paper honeycomb core 12 (made by core pack Nishikawa) with a thickness of 30 mm is bonded and fixed with a second face plate 20 made by paper with a thickness of 1.0 mm (made by core pack Nishikawa) Yes, as shown in FIG.
  • Structural Example 2 is a soundproof structure 11A in which a 15 mm thick urethane is adhered and disposed on the second surface plate 20 of the soundproof structure 11 of Structural Example 1 and is shown in FIG.
  • the through holes 18 having a diameter of 1.0 mm are opened in a zigzag shape with a center distance of 12 mm in the second surface plate 20 on one side of the soundproof structure 11 of the structural example 1 by a laser processing machine (GCC LaserPro C1802) It is the soundproof structure 10 which made the 1st surface board 16 and is shown in FIG.
  • the soundproof structure 10 has a Helmholtz resonance structure in which mass-to-spring resonance occurs due to a closed space (a space surrounded by one cell of the honeycomb core 12 and the second surface plate 20) of the through hole 18 and the back honeycomb portion. .
  • Structural example 4 is a minute through hole 24 of 25 ⁇ m as a sound absorber 22 between the honeycomb core 12 and the first surface plate 16 made of paper in which the through holes 18 having a diameter of 2 mm are opened in parallel at a center distance of 4 mm.
  • FIG. 6 shows a soundproof structure 10A in which a minute through-hole plate 26 made of aluminum and having a thickness of 20 ⁇ m opened at an aperture ratio of 6.5% is disposed.
  • the adhesive used for adhesive fixing was Spray Paste 77 (manufactured by 3M).
  • FIG. 16 shows the results of measurement of the normal incidence sound absorption coefficient of each of the structural examples 1 to 4 by the measurement using the self-made acoustic tube, using the acoustic tube.
  • Measurement of acoustic characteristics using a self-made acoustic tube was a measurement by a transfer function method using four microphones in a self-made acrylic acoustic tube. This method is in accordance with "ASTM E2611-09: Standard Test Method for Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix Method".
  • As the acoustic tube for example, one having the same measurement principle as WinZac manufactured by Nittobo Acoustic Engineering Co., Ltd. was used.
  • the soundproof structure 10 of the present embodiment was disposed at the measurement site of the acoustic pipe, and the measurement of the normal incidence sound absorption coefficient of each soundproof structure was performed in the range of 100 Hz to 4000 Hz.
  • the inner diameter of the acoustic tube is 40 mm and can be sufficiently measured up to 4000 Hz or more.
  • the normal incidence sound absorption coefficient is low in the measurement range because there is no sound absorbing body.
  • Structural Example 2 it can be seen that the sound absorption coefficient increases in the high frequency region.
  • Structural Example 3 shows a low frequency sound absorption characteristic having a peak around 700 Hz. This sound absorption characteristic is due to Helmholtz resonance.
  • Structural Example 4 shows high sound absorption characteristics in a wide band of 500 Hz or more. This is considered to be caused by the high acoustic resistance of the fine through holes 24 being added to the air column resonance of the pillars of the cells of the honeycomb core 12.
  • Example 1 Five soundproof walls having a soundproof structure of 50 cm ⁇ 50 cm were fixed with an adhesive to prepare soundproof boxes of Example 1 and Comparative Examples 1 to 3 to be measured.
  • the soundproof wall 32 which consists of the soundproof structure 10 of the structural example 3 shown in FIG.
  • the soundproof wall 34 which consists of the soundproof structure 10A of the structural example 4 shown in FIG.
  • the two side surfaces of the soundproof box of Comparative Example 1 are replaced by a soundproof wall 32 having the soundproof structure 10 of Structural Example 3 shown in FIG. 4 and a soundproof wall 34 having the soundproof structure 10A of Structural Example 4 shown in FIG. It is referred to as Example 1.
  • FIG. 17 shows a measurement system for evaluating the soundproofness of the soundproof box of Example 1 using the soundproof walls of Structural Examples 1 to 4 and Comparative Examples 1 to 3.
  • a speaker 44 for emitting a sound source was disposed inside the soundproof box of Example 1 and Comparative Examples 1 to 3. Outside the three microphones 46 and the soundproof box 42 inside the soundproof wall of the soundproof box 42, the microphone 48 was placed 50 cm from the soundproof box 42 at a height of 70 m, and the sound from inside and outside the box from the speaker 44 was measured.
  • the average noise amount (microphone sound pressure level) of the microphone outside the soundproof box 42 when pink noise is produced from the speaker 44 is shown in FIG.
  • Comparative Example 1 since there is no sound absorbing structure, the volume leaking out is large. In Comparative Example 2, a large soundproofing effect is obtained in the vicinity of 630 Hz due to the Helmholtz resonance sound absorption effect of Structural Example 3. On the other hand, in the comparative example 3, since the broadband sound absorbing structure of the structural example 4 is used, soundproofing can be performed at a wide frequency. In Example 1, the soundproofing effect near 630 Hz by the Helmholtz of Structural Example 3 and the soundproofing effect of the wide band of Structural Example 4 can be combined to realize a high soundproofing effect in a wide band.
  • FIG. 19 shows data (microphone sound pressure level) obtained by averaging the sound pressures of the three microphones inside the box. From this data, it can be seen that the structure of the first embodiment can mute the sound in a wide band even inside the soundproof box. From the above results, the effects of the present invention are clear.
  • the soundproof box according to the present invention can be used, for example, as a soundproof hut for pets such as kennels, or a soundproof box for equipment (generator, PC) cover serving as a noise source, or a soundproof room for people.
  • the soundproof box of the present invention is formed by boxing the inside (side walls excluding windows, ceiling, floor, etc.) of a building or other architectural structure (eg, a house, a hall, an elevator, a music classroom, a meeting room, etc.) It can be used for building applications such as covering panels and the like, transportation applications such as interiors of automobiles, and logistics applications such as box materials and packing materials.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)

Abstract

La présente invention concerne une boîte d'insonorisation qui a une pluralité de parois d'insonorisation ayant chacune une structure d'insonorisation ayant : une âme en nid d'abeilles ; une première plaque de surface et une seconde plaque de surface qui prennent en sandwich l'âme en nid d'abeilles ; et des trous traversants perforés dans la première plaque de surface, la pluralité de parois d'insonorisation ayant au moins deux types de parois d'insonorisation ayant des caractéristiques de fréquence différentes les unes des autres. La boîte d'insonorisation de la présente invention est mince et légère, et est apte à parvenir à une rigidité élevée et à une insonorisation à large bande.
PCT/JP2019/000088 2018-01-10 2019-01-07 Boîte d'insonorisation Ceased WO2019138969A1 (fr)

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JP7591363B2 (ja) 2020-07-01 2024-11-28 株式会社Lixil 建材
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CN111916040B (zh) * 2020-08-13 2022-07-05 哈尔滨工程大学 一种带有穿孔板的膜型声学超材料吸隔声装置
CN112340602A (zh) * 2020-10-29 2021-02-09 西南交通大学 一种应用于门式起重机的复合层降噪罩
CN112340602B (zh) * 2020-10-29 2021-05-25 西南交通大学 一种应用于门式起重机的复合层降噪罩
CN115579226A (zh) * 2022-09-09 2023-01-06 江苏宝亨新电气有限公司 一种高隔音油浸式变压器及其快速制作方法

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