JP4060760B2 - Sound absorbing panel and sound absorbing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound absorbing panel and a sound absorbing device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known a sound absorbing device configured by arranging a thin plate (sound absorbing panel) provided with a large number of fine holes on a front surface of a rigid wall at a predetermined interval (see Non-Patent Document 1 below).
[0003]
This sound absorbing device does not require a sound absorbing material such as a fiber, and has an advantage of being able to absorb a low frequency band that is difficult to absorb with a conventional sound absorbing material.
[0004]
[Non-Patent Document 1]
Maa Dah-you, “Theory and design of microperforated panel sound-absorbing constructions”, SCIENTIA SINICA, Jan-Feb, 1975, pp55-71
[0005]
[Problems to be solved by the invention]
A resonator-type sound absorbing device combining a perforated plate, an air layer, and a rigid wall has been known before the publication of Non-Patent Document 1, but Non-Patent Document 1 sets the hole diameter to 1 mm or less, A theoretical analysis has been announced that the pitch can be absorbed to the low frequency range by using the viscous resistance of the air in the fine holes by appropriately determining the pitch.
[0006]
However, precisely processing the hole diameter to 1 mm or less requires considerable processing technology, and it is necessary to select a material that can be processed precisely, so the selection of the material is limited in terms of appearance and cost. .
[0007]
In addition, since the holes are uniformly perforated on the surface of the sound absorbing panel, the total number is enormous, and a lot of man-hours are required for drilling. For example, in one of the numerical examples of Non-Patent Document 1, the hole diameter is 0.75 mm as the first case, the hole pitch is 4.7 times the hole diameter, the hole diameter is 0.75 mm as the second case, and the hole pitch is the hole diameter. Although taken up 7.7 fold, about 80,000 per 1 m ² is the number of holes in the former, the latter is about 30,000 per 1 m ² is, for example, when using such interior materials of building materials, the hole The total number of numbers was enormous.
[0008]
It is an object of the present invention to improve the productivity of fine hole portions that require precision processing, and to provide a degree of freedom in selecting the material of the sound absorbing panel base material portion to enrich the appearance and reduce costs. And
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention uses a fine hole portion and a sound absorbing panel base material portion as separate members.
[0010]
That is, the present invention provides a sound-absorbing panel disposed on the front surface of a rigid wall at a predetermined interval, and includes a panel base material in which a large number of mounting holes penetrating in the plate thickness direction are formed, and a cross-sectional area from the mounting holes. And a large number of minute hole members fitted in the respective attachment holes.
[0011]
According to such a sound absorbing panel, it is not necessary to provide precise fine holes directly in the panel base material, so that excellent productivity can be realized. Moreover, the material of the panel base material is not restricted from the viewpoint of the workability of precise fine holes.
[0012]
Further, in such a sound absorbing panel, it is preferable that a connection portion for connecting a plurality of the fine hole members is provided at intervals of the mounting holes formed in the panel base material.
[0013]
If it does in this way, it can attach to a panel base material efficiently in the state which connected a plurality of fine hole members.
[0014]
In such a sound absorbing panel, it is desirable that the plurality of fine hole members and the connecting portion are integrally formed.
[0015]
If it does in this way, a plurality of fine hole members and a connection part can be manufactured efficiently.
[0016]
Further, in such a sound-absorbing panel, the panel and the base material is composed of a material having a different stiffness, it is desirable with a rear cover plate which was disposed to cover the rear side surface of the panel base material.
[0017]
If it does in this way, since the acoustic rigidity of the back side surface of a sound-absorbing panel can be secured by a back surface covering plate, the material of a panel base material can be selected according to the appearance etc.
[0018]
In such a sound absorbing panel, it is desirable that the back cover plate and the plurality of fine hole members are integrally formed.
[0019]
If it does in this way, a back surface covering board and a plurality of fine hole members can be manufactured efficiently. Moreover, a plurality of fine holes can be efficiently attached to the panel base material.
[0020]
In such a sound absorbing panel, it is desirable that the panel base material is made of a foam material.
[0021]
In this case, in addition to the sound absorbing effect by the sound absorbing panel having the fine holes, the sound absorbing effect by the foamable material can be obtained, so that a better overall sound absorbing performance can be obtained.
[0022]
The sound absorbing device according to the present invention includes a rigid wall, any one of the above sound absorbing panels, and holding means for holding the sound absorbing panel on a front surface of the rigid wall at a predetermined interval. To do.
[0023]
According to such a sound absorbing device, it is possible to realize excellent productivity by the sound absorbing panel.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0025]
(First embodiment)
FIG. 1 is a partial cross-sectional perspective view of the sound absorbing device according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional explanatory view of a sound absorbing panel provided in the sound absorbing device.
[0026]
As shown in FIG. 1, the sound absorbing device 10 holds a sound absorbing panel 30 at a position through a predetermined interval on a front surface of the rigid wall 20 made of an acoustically strong material, a sound absorbing panel 30, and the rigid wall 20. And a holding member (holding means) 50.
[0027]
The holding member 50 is attached to the front surface side of the rigid wall 20, and the sound absorbing panel 30 is attached to the front end edge portion thereof by, for example, screwing. What is necessary is just to set the space | interval of the rigid wall 20 and the sound absorption panel 30 suitably according to the sound absorption performance etc. which are calculated | required.
[0028]
The sound absorbing panel 30 is composed of a panel base material 31 and a large number of fine hole members 40.
[0029]
The panel base material 31 has a large number of mounting holes 32 penetrating in the thickness direction. The mounting holes 32 are provided at predetermined pitches in the vertical and horizontal directions of the panel base material 31, for example, every 10 mm.
[0030]
The fine hole members 40 are configured to have substantially the same outer shape as the mounting holes 32, and are fitted into the mounting holes 32 of the panel base material 31 by means such as press fitting or adhesion.
[0031]
The mounting holes 32 and the fine hole members 40 are formed in a cylindrical shape here, but may have any cross-sectional shape. Further, the cross-sectional shape may change in the thickness direction of the sound absorbing panel 30 (the depth direction of the mounting holes 32).
[0032]
The fine hole member 40 is formed with a fine hole 41 having a smaller cross-sectional area than the attachment holes 32.
[0033]
As shown in FIG. 2, the shape of the fine hole 41 may be a shape that is formed in a tapered shape from one side of the fine hole member 40. The size of the fine hole 41 is, for example, 0.6 mm at the smallest portion.
[0034]
As the shape of the fine hole 41, various shapes as exemplified in FIG. Specifically, as shown in FIG. 3A, the microhole 41 has straight large hole portions 411 and 411 having relatively large diameters from both the upper and lower sides of the microhole member 40, and a wall portion 412 that partitions them. Further, a form in which a fine hole part 413 is provided, a form in which the fine hole part 414 provided in the wall part 412 is tapered as shown in FIG. 3 (b), or the wall part as shown in FIG. 3 (c). A shape in which the fine hole portion 415 provided in 412 is tapered toward the upper and lower sides, or a straight large hole portion 416 having a relatively large diameter is formed from only one side of the fine hole member 40 as shown in FIG. A tapered fine hole 417 is formed at the tip and penetrated through the other surface, or a straight fine hole 418 is formed at the tip of the large hole 416 as shown in FIG. The form etc. which were penetrated to the other surface can be mentioned.
[0035]
Further, the fine hole 41 may be provided at a position shifted from the center of the fine hole member 40, or a plurality of fine holes 41 may be provided in each fine hole member 40.
[0036]
Such a fine hole member 40 is a small member as compared with the panel base material 31 and is therefore easily processed with precision. For this reason, it is easy to form the fine holes 41 more precisely.
[0037]
The material of the fine hole member 40 is not particularly limited as long as the fine hole 41 can be formed. However, the fine hole member 40 is preferably made of a material superior in precision workability to the panel base material 31. Specifically, various plastic materials can be cited if productivity is important, and various metal materials can be cited if thermal conductivity is important. Moreover, although the manufacturing method in particular of this microporous member 40 is not restrict | limited, When it comprises from various plastic materials, injection molding can be mentioned as a suitable manufacturing method. Further, since more accurate processing can be performed, the fine holes 41 may be manufactured by cutting with a drill or an automatic lathe.
[0038]
On the other hand, since it is only necessary to form mounting holes 32... Larger than the fine holes 41 for obtaining sound absorption performance in the panel base material 31, the panel base material 31 is directly formed on the panel base material 31, which is a larger member than the fine hole member 40. Since it is not necessary to provide precise fine holes directly on the surface, excellent productivity can be realized.
[0039]
Moreover, the panel base material 31 can be configured to be thicker than the thickness required for the fine holes 41 to ensure sufficient mechanical strength.
[0040]
Moreover, the raw material of the panel base material 31 is not restricted from the viewpoint of the workability of precise fine holes. For this reason, as the panel base material 31, various materials such as acoustically strong and rigid plate materials such as wood, stone, slate, concrete, metal plate, and synthetic resin plate can be employed.
[0041]
Furthermore, the panel base material 31 can also be comprised from the foamable material which has the sound absorption performance in a medium-high frequency band. Specific examples of the foam material include foam plastic and foam concrete.
[0042]
FIG. 4 is an explanatory diagram of the sound absorbing performance when the panel base material is made of a foamable material. When the sound absorbing panel 30 having the fine holes 41... Provides an excellent sound absorbing effect in a relatively low frequency region as shown in FIG. 4A, a relatively high frequency as shown in FIG. When the panel base material 31 is made of a foam material having an excellent sound absorbing effect in the region, these sound absorbing effects are added together to obtain a better overall sound absorbing performance as shown in FIG. Can do.
[0043]
(Second Embodiment)
Next, a second embodiment will be described.
[0044]
FIG. 5 is an explanatory cross-sectional view of a sound absorbing panel according to the second embodiment of the present invention, and FIG. 6 is a plan view of a microporous member. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
[0045]
In the sound absorbing panel 30 according to the second embodiment, a plurality of fine hole members 40 are connected to each other by a connecting portion 42. The connecting portion 42 has a plurality of fine hole members 40 (specifically, three in each of the vertical direction and the horizontal direction so as to correspond to the positions of the plurality of mounting holes 32 formed in the panel base material 31. A total of 9 pieces arranged one by one) are connected via the formation interval of the mounting holes 32.
[0046]
The plurality of microporous members 40... Connected in this way are integrally configured as a microporous member assembly 43 together with the connecting portions 42. Specifically, it can be manufactured, for example, by injection molding of synthetic resin.
[0047]
Thus, since the plurality of microporous members 40 are integrally formed, each of them can easily handle the small microporous members 40. Moreover, since the attachment positioning to the panel base material 31 of several fine hole member 40 ... can be performed collectively, an assembly can be performed efficiently. Further, even after the fine hole members 40 are attached to the panel base material 31, the fine hole members 40 are connected so as to remain in a predetermined position, so that dropping from the attachment holes 32 can be reduced. it can.
[0048]
Further, the connecting portions 43... Positioned at the peripheral edge portions of the respective microporous member assemblies 43 are provided with coupling means 44 for connecting with the connecting portions 42 of the adjacent microporous member assemblies 43. It has been. Specifically, the coupling means 44 includes an engagement portion 441 that is slightly inflated formed at one end portion of the coupling portions 42 and 42 that are coupled to each other, and an engaged portion that engages with the engagement portion 441. Part 442.
[0049]
In this way, each microporous member assembly 43 is provided with the coupling means 44, so that a plurality of microporous member assemblies 43 are connected in advance, and more microporous members 40 are integrally handled, The panel base material 31 can be efficiently mounted in the mounting holes 32. Moreover, dropping of the fine hole members 40 attached to the panel base material 31 can be further reduced.
[0050]
(Third embodiment)
Next, a third embodiment will be described.
[0051]
FIG. 7 is a cross-sectional explanatory view of a sound absorbing panel according to the third embodiment of the present invention. Hereinafter, the same reference numerals are given to the same components as those in the first and second embodiments, and the duplicate description will be omitted.
[0052]
In the sound absorbing panel 30 according to the third embodiment, the back surface of the panel base material 31 is covered with the back cover plate 45. The back cover plate 45 is made of a material different from the panel base material 31 and acoustically rigid. Specific examples include a synthetic resin plate and an aluminum plate. The back cover plate 45 has at least the fine holes 41 of the fine hole members 40 so that the panel base material 31 is not exposed to the back side.
[0053]
Thus, since the back side of the panel base material 31 is covered with the back cover plate 45, the acoustic rigidity of the back side surface of the sound absorbing panel 30 is ensured regardless of the material of the panel base material 31, and the fine holes The sound absorption effect having Therefore, the material of the panel base material 31 can be selected according to, for example, the appearance.
[0054]
In the sound absorbing panel according to the third embodiment, the back cover plate 45 is formed integrally with a plurality of fine hole members 40. Specifically, it is integrally molded, for example, by injection molding of a synthetic resin material.
[0055]
As described above, since the plurality of fine hole members 40 are integrally formed with the back cover plate 45, each of the small hole members 40 can be easily handled as in the second embodiment described above. In addition, it is possible to efficiently attach the plurality of fine hole members 40 to the panel base material 31 and to reduce the dropout of the fine hole members 40 from the attachment holes 32.
[0056]
As mentioned above, although this invention was demonstrated based on three embodiment, this invention is not limited to the said embodiment, In the range of the summary, it can change suitably.
[0057]
【The invention's effect】
As described above, according to the sound absorbing panel and the sound absorbing device according to the present invention, it is not necessary to directly provide precise fine holes in the panel base material constituting the sound absorbing panel, so that excellent productivity can be realized. In addition, the material of the panel base material is not restricted from the viewpoint of the workability of precise fine holes.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view of a sound absorbing device according to a first embodiment of the present invention.
FIG. 2 is an explanatory cross-sectional view of the sound absorbing device according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional explanatory view illustrating the shape of a microhole formed in a microhole member.
FIG. 4 is an explanatory diagram of sound absorption performance when the panel base material is made of a foamable material.
FIG. 5 is a cross-sectional explanatory view of a sound absorbing panel according to a second embodiment of the present invention.
FIG. 6 is a plan view of a fine hole member provided in the sound absorbing panel.
FIG. 7 is a cross-sectional explanatory view of a sound absorbing panel according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Sound absorbing device 20 Rigid wall 30 Sound absorbing panel 31 Panel base material 32 Mounting hole 40 Fine hole member 41 Fine hole 42 Connecting part 43 Fine hole member aggregate 44 Coupling means 45 Back surface covering plate 50 Holding member (holding means)

Claims (7)

A sound-absorbing panel disposed on the front surface of the rigid wall at a predetermined interval,
A panel base material in which a large number of mounting holes penetrating in the plate thickness direction are formed;
Micro holes having a smaller cross-sectional area than the mounting holes are formed, and a large number of micro hole members fitted into the mounting holes,
A sound absorbing panel characterized by comprising: The sound absorbing panel according to claim 1, further comprising a connecting portion that connects a plurality of the fine hole members at intervals of the mounting holes formed in the panel base material. The sound absorbing panel according to claim 2, wherein the plurality of fine hole members and the connecting portion are integrally formed. The sound-absorbing panel according to claim 1, further comprising a back cover plate that is made of a material having rigidity different from that of the panel base material and is arranged so as to cover a back side surface of the panel base material. The sound absorbing panel according to claim 4, wherein the back cover plate and the plurality of fine hole members are integrally formed. The sound absorbing panel according to claim 1, wherein the panel base material is made of a foamable material. A rigid wall,
The sound absorbing panel according to any one of claims 1 to 6,
Holding means for holding the sound absorbing panel on the front surface of the rigid wall at a predetermined interval;
A sound absorbing device comprising:

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