Sound absorbers and sound absorber arrangement structures

Abstract

To provide a sound absorption device which can be easily retrofitted.SOLUTION: A sound absorption device is fitted to a space and comprises a sound absorption body installed on a ceiling surface facing the space, a wall surface or a floor surface or at least any surface of a structure to be installed in the space (hereinafter referred to as 'ceiling surface or the like' or exposed in the space. The sound absorption body has a long body, a slit formed in that body and a cavity in contact with the slit, and absorbs sound in the space by communicating the inner slit with the space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sound absorber and an arrangement structure of the sound absorber. [Background technology]

[0002] A known sound absorbing structure in which unit sound absorbers 2 are adjacent to each other via linear openings in a ceiling surface or the like facing a space is disclosed in Patent Document 1. However, this requires large-scale construction, and partial retrofitting after construction is difficult. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-188954 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above-described conventional situation, an object of the present invention is to provide a sound absorber and a sound absorber arrangement structure that can be easily retrofitted. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, the sound absorber of the present invention is characterized in that it is configured to be attached to a space and is installed on the surface of at least one of a wall, ceiling or floor facing the space, and a structure to be installed in the space (hereinafter referred to as "wall, etc."), or exposed within the space, and has a main body extending in the longitudinal direction, a slit formed along the longitudinal direction of the main body, a cavity communicating with the slit, and end caps that close the longitudinal ends of the cavity, and this internal slit communicates with the space to absorb sound within the space, and the main body comprises a first divided body that forms the cavity, and a second divided body attached to the surface side of the first divided body, and this second divided body has a throat portion that positions the opening of the slit toward the outside of the main body, and this throat portion is positioned outside the first divided body, and the throat portion is formed by the thickness of the surface side portion of the second divided body, and the width of the opening in the direction perpendicular to the longitudinal direction is determined by the attachment position of the second divided body to the first divided body. In the above configuration, the main body may have a pair of cavities on the left and right sides of the slit in a cross section perpendicular to the longitudinal direction, and sound absorbing material may be provided between each of the cavities and the slit. In order to achieve the above object, a feature of the sound absorber arrangement structure of the present invention is that, in a configuration equipped with any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on the wall surface. In order to achieve the above object, another feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on a wall surface, with the lower ends of the sound absorbers resting on the floor. In order to achieve the above object, a further feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on a wall surface, and the lower ends of the sound absorbers are spaced apart from the floor. In order to achieve the above object, another feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented horizontally and aligned vertically and attached to a wall surface. [Effects of the Invention]

[0006] According to the features of the sound absorber and sound absorber arrangement structure of the present invention, it is possible to easily attach the sound absorber to a space, a wall surface, or the like after the fact.

[0007] Other objects, configurations and effects of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a sound absorber according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along the XY plane of FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along the YZ plane of FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along the XZ plane of FIG. [Figure 5a] FIG. 3 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2. [Figure 5b] FIG. 10 is a perspective view showing dimensions for explaining the principle. [Figure 6a] 1 is a perspective view showing an example of the horizontal position of a sound absorber according to the present invention. FIG. [Figure 6b] FIG. 6B is a perspective view showing an example of the arrangement of FIG. 6A attached to the ceiling in a vertical position. [Figure 6c] FIG. 6B is a perspective view showing an example of the arrangement of FIG. 6A in a vertical position on the floor. [Figure 6d] FIG. 6B is a perspective view showing an example of the arrangement in which FIG. 6A is positioned vertically and midway between the ceiling and the floor. [Figure 7a] FIG. 10 is an XY cross-sectional view showing a state in which parts are assembled, illustrating a first modified example of the first embodiment. [Figure 7b] FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a first modified example of the first embodiment. [Figure 8] FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a second modified example of the first embodiment. [Figure 9a]FIG. 10 is an XY cross-sectional view showing a state in which parts according to a second embodiment are assembled. [Figure 9b] FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to a second embodiment. [Figure 10] FIG. 3 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the second embodiment. [Figure 11] FIG. 10 is an XY cross-sectional view showing a state in which parts are assembled, showing a first modified example of the second embodiment. [Figure 12a] FIG. 10 is an XY cross-sectional view showing a state in which parts according to a third embodiment are assembled. [Figure 12b] FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to a third embodiment. [Figure 13] FIG. 10 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the third embodiment. [Figure 14a] FIG. 13 is an XY cross-sectional view showing a state in which parts are assembled, showing a first modified example of the third embodiment. [Figure 14b] FIG. 13 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a first modified example of the third embodiment. [Figure 15a] FIG. 10 is an XY cross-sectional view showing a state in which parts according to a fourth embodiment are assembled. [Figure 15b] FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to a fourth embodiment. [Figure 16] FIG. 10 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the fourth embodiment. [Figure 17] FIG. 13 is an XY cross-sectional view showing a first modified example of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Next, a first embodiment of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 8, as appropriate.

[0010] Figure 1 is a perspective view of a sound absorber according to a first embodiment of the present invention. The internal structure is visible to make the cross section easier to understand, but both ends are sealed with end caps 9. A slit-shaped opening 8 is provided along the longitudinal direction in a long, narrow box-shaped main body 4. A throat 5 extends from the opening 8 into the inside of the main body 4. There is a cavity connected to the back of the throat 5, and a sound absorber 7 is installed next to this. A cavity 3 is provided at the back of the sound absorber, and the shape is long and narrow.

[0011] Next, the protrusions 6 are provided to prevent the sound absorber 7 from falling over or coming out of its correct position.

[0012] Figure 2 is a cross-sectional view of the XY plane in Figure 1. The sound absorber 2 has a flat surface with a groove formed on the surface, consisting of an opening 8 and a throat 5. It is attached to the interior wall board 113. It can be attached to the interior wall board 113 with adhesive, double-sided tape, screws, etc. If the wall is made of metal, it can be attached using a magnet or other common method.

[0013] Fig. 3 is a cross-sectional view taken along the YZ plane in Fig. 1, and Fig. 4 is a cross-sectional view taken along the XZ plane in Fig. 1. The sound absorber 2 is installed with its opening 8 facing the interior of the room. The sound absorber 2 has a cavity at the back of the opening 8, in which a sound absorbing body 7 is installed. Cavities 3 are provided on both sides of the sound absorber 7.

[0014] FIG. 5a is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2, and FIG. 5b is a perspective view showing dimensions for explaining the principle.

[0015] In the above, the resonance frequency f0 of the sound absorber is calculated, for example, as in the following equation 1. formula 1 f0={c / (2π)}×[(a×b) / {V1(l+Kb)}] 1 / 2 In the above equations, the variables are as follows (see Figures 5(a) and 5(b)): formula 2 K=1 / π+2 / π×loge(2a / b) formula 3 V1=A×B×La×b×l V1: Cavity volume, A: Cavity length, B: Cavity width, L: Cavity height, a: Opening length, b: Opening width, l: Throat

[0016] In Figures 5(a) and 5(b), L, l, etc. are the dimensions of the openings, and the figures show the relationship between the main body 4 and throat 5 of the sound absorber 2. Each dimension is an inside measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, because the throat l and / or opening width b are changeable, it is possible to adjust the resonant frequency to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as necessary.

[0017] FIG. 6 shows examples of sound absorber placement according to the present invention, with (a) in a horizontal position, (b) in a vertical position when attached to the ceiling, (c) in a vertical position when attached to the floor, and (d) in a vertical position when attached halfway between the ceiling and the floor. The configuration in (a) allows for efficient installation at the desired location for sound absorption, such as where a person's head is when seated. The configuration in (b) eliminates unnecessary protrusions at the foot of the wall by attaching the sound absorber to the ceiling, reducing the risk of injury to the feet. The configuration in (c) allows for more stable installation, since the main body 4 is installed on the floor and the weight of the sound absorber 2 is supported by the floor. The configuration in (d) allows for efficient installation at the desired location for sound absorption, covering the ears of people in a room from sitting in a chair to standing.

[0018] FIG. 7a is an XY cross-sectional view showing a state in which parts showing a first modified example of the first embodiment are assembled, and FIG. 7b is an XY cross-sectional view showing a state in which parts showing the first modified example of the first embodiment are separated.

[0019] The sound absorption frequency of the main body 4 can be set by the length l of the throat 5 and the width b of the opening 8 shown in Fig. 5a. To achieve this, a second divided body 12 is installed relative to the first divided body so that the length l of the throat 5 and the width b of the opening 8 are appropriately designed. Furthermore, because the throat portion 5 of the second divided body 12 is bent inward toward the first divided body 11, the sound absorber 2 has a slit at the opening 8 and a flat surface, so that even if the sound absorber 2 is installed inside a room, it will have a protruding shape, but it can be said that this shape does not cause any problems when installed inside a room.

[0020] As shown in Figure 7b, the sound absorption characteristics can be changed by changing the position and size of the second segment 12 while keeping the shape of the first segment 11 the same. Changing the characteristics of the sound absorber 2 by changing only the second segment 12 while keeping the shape of the first segment 11 the same has advantages both in terms of providing customers with a product that meets their performance requirements and in terms of manufacturing the product.

[0021] FIG. 8 is an XY cross-sectional view showing a second modified example of the first embodiment with the parts separated. By shaping the second divided body 13 as shown in FIG. 8, the size of the throat portion 5 and the opening 8 is automatically determined, which is advantageous in manufacturing. Furthermore, since the second divided body 13 covers the sides as well, there is an advantage in designing the surface and sides to have the same shape. Furthermore, by covering the sides as well as the surface of the sound absorber 2 with surface decoration such as paint, a sense of unity can be created for the product. The bottom surface is in close contact with the wall, so there is no need to worry too much about it.

[0022] The following are the second and subsequent embodiments. The same components and structures as those in the first embodiment are designated by the same reference numerals. Figure 9a is an XY cross-sectional view showing the assembled parts of the second embodiment, and Figure 9b is an XY cross-sectional view showing the separated parts of the second embodiment. The throat 5 and opening 8 are positioned facing outward from the main body 4. This allows the installation of a concealing material 23. The concealing material 23 serves to prevent objects or fingers from being inserted into the gap in the cavity 3 inside the main body 4 through the groove formed by the second divided body 22. It is also expected to have the effect of concealing the sound-absorbing material 7.

[0023] The sealing material 23 can be securely installed by being sandwiched between the main body 4 and the second divided body 22. Any material that does not affect the sound absorption performance can be used for the sealing material (for example, glass cloth, nonwoven fabric, punched metal, etc.).

[0024] Fig. 10 is a cross-sectional view showing dimensions for explaining the principle in the XY plane in the second embodiment, similar to Fig. 2. In the above, at the resonance frequency f0 of the sound absorber, equations 1 and 2 are the same as above, but V2 in the following equation 4 is used instead of V1 in equation 3 in equation 1. formula 4 V2=A×B×L V2: Cavity volume, A: Cavity length, B: Cavity width, L: Cavity height

[0025] In Figure 10, L, l, etc. are the dimensions of the openings, and the figure shows the relationship between the main body 4 and the throat 5 of the sound absorber 2. Each dimension is an internal measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, since the throat l and / or opening width b are changeable, it is possible to adjust the resonant frequency to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as necessary. Furthermore, by having the throat 5 and opening 8 extend outside the main body 4, V2 in Figure 10 is larger than V1 in Figure 5(a), which allows for a lower resonant frequency.

[0026] 11 is an XY cross-sectional view showing the assembled parts of a first modified example of the second embodiment. The width of the opening 8 is automatically determined by fitting the second divided body 22 along the side surface of the main body 4, thereby reducing installation errors. In addition, the material and paint of the second divided body 22 allow for a uniform design.

[0027] FIG. 12a is an XY cross-sectional view showing a state in which parts showing the third embodiment are assembled, and FIG. 12b is an XY cross-sectional view showing a state in which parts showing the third embodiment are separated.

[0028] By providing the second divided body 32 with the punched portion 32a on the first divided body 31, the same effect can be expected without using a sealing material. Foreign matter does not enter the hollow portion 3. Since the only materials that are calibrated are the first divided body 31 and the second divided body 32, the number of parts can be reduced.

[0029] FIG. 13 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the third embodiment.

[0030] In the above, the resonance frequency f0 of the sound absorber is calculated by the above-mentioned formula 1-3.

[0031] FIG. 14a is an XY cross-sectional view showing a first modified example of the third embodiment, and FIG. 14b is an XY cross-sectional view showing a state in which parts of the first modified example of the third embodiment are separated.

[0032] 14a is composed of a first divided body 33, a second divided body 34, and a third divided body 35. The external shape is composed of the second divided body 34, and the first divided body 33 can form a sealed structure for the second divided body 34. The third divided body 35 is provided to fix the position of the sound absorber 7.

[0033] By bending the end of the first divided body 35, the folded part of the second divided body fits into that part, so that the back surface is smooth and can be installed tightly against the wall, as shown in Figure 14a.

[0034] FIG. 15a is an XY cross-sectional view showing a state in which parts showing the fourth embodiment are assembled, and FIG. 15b is an XY cross-sectional view showing a state in which parts showing the fourth embodiment are separated.

[0035] By combining the first divided body 41 with the second divided body 42, the throat 5 and the opening 8 can be formed on the outside of the first divided body 41. Furthermore, by using a thick second divided body, the surface is flat and the opening 8 can be formed with a groove, making it convenient to install on the wall of a room, etc.

[0036] The second divided body 42 can be made of various materials such as wood, plastic, metal, etc. It is configured in such a way that a masking material 23 is placed on the first divided body 41 and then the second divided body 42 is placed over it. The second divided body 42 does not have to be a single body, but may be divided into several parts.

[0037] FIG. 16 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the fourth embodiment. In the above, the resonance frequency f0 of the sound absorber is calculated using the above equations 1, 2, and 4.

[0038] In Figure 16, L, l, etc. are the dimensions of the openings, and the figure shows the relationship between the main body 4 and the throat 5 of the sound absorber 2. Each dimension is an internal measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, since the throat l and / or opening width b are changeable, it is possible to adjust the resonance frequency to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as necessary. Furthermore, by having the throat 5 and opening 8 extend outside the main body 4, V2 in Figure 16 is larger than V1 in Figure 5(a), which allows for a lower resonance frequency.

[0039] 17 is an XY cross-sectional view showing a first modified example of the fourth embodiment. The weight can be reduced by providing the notched groove 42 in the second divided body 42. Since it is to be installed in a room, it goes without saying that a lighter weight is better for portability and installation. [Industrial Applicability]

[0040] The present invention can be used as a sound absorber that can be retrofitted to the walls, ceilings, floors, and pillars of a space. [Explanation of symbols]

[0041] 1: sound absorbing structure, 2: sound absorber, 3: cavity, 4: main body, 5: throat, 6: protrusion, 7: sound absorbing material, 8: opening, 9: end cap, 10: sound absorber, 11: first division, 12: second division, 13: second division, 20: sound absorber, 21: first division, 22: second division, 23: screening material, 24: second division, 30: sound absorber, 31: first division, 32: second division, 32a: punched portion, 33: first division, 34: second division, 34a: punched portion, 35: third division, 40: sound absorber, 41: first division Split body, 42: second split body, 42a: notch groove, 23: screen material, 100: indoor structure, 101: hanging bolt, 102: hanger, 103: sill support, 104: sill, 105: mounting angle, 106: mounting channel, 107: ceiling board, 110: runner, 111: stud, 112: foundation wall board, 113: interior wall board, 114: wall slab, 120: floor slab, 121: bottom runner, 130: support, B: cavity width, a: neck slit length, b: neck slit width, L: cavity height, l: neck height

Claims

1. A sound absorber to be attached to a space, which is installed on the surface of at least one of the ceiling, wall or floor surfaces facing the space, and a structure to be installed in the space (hereinafter referred to as "ceiling surface, etc."), or is exposed within the space, and has a main body extending in the longitudinal direction, a slit formed along the longitudinal direction of the main body, a cavity communicating with the slit, and end covers closing the longitudinal ends of the cavity, and this inner slit communicates with the space to absorb sound within the space, the main body includes a first divided body that forms the cavity and a second divided body attached to a surface side of the first divided body, the second divided body having a throat portion that positions an opening of the slit toward the outside of the main body, and the throat portion is positioned outside the first divided body; the throat portion is formed by the thickness of the surface side portion of the second segment; A sound absorber in which the width of the opening in a direction perpendicular to the longitudinal direction is determined by the attachment position of the second divided body relative to the first divided body.

2. 2. The sound absorber according to claim 1, wherein the main body has a pair of cavities on the left and right sides of the slit in a cross section perpendicular to the longitudinal direction, and a sound absorbing material is provided between each cavity and the slit.

3. 3. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, wherein the sound absorbers are attached to a wall surface in a vertical orientation and horizontally aligned arrangement.

4. 3. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, wherein the sound absorbers are oriented vertically and arranged horizontally on a wall surface, and the lower ends of the sound absorbers are attached to the floor.

5. 3. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, wherein the sound absorbers are oriented vertically and arranged horizontally on a wall surface, and the lower ends of the sound absorbers are spaced apart from the floor.

6. 3. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, wherein the sound absorbers are oriented horizontally and aligned vertically and attached to a wall surface.

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