JP6382592B2 - Sound absorption panel - Google Patents

Description

  The present invention relates to a sound absorbing panel that absorbs sound.

  Conventionally, a sound absorbing panel that absorbs sound has been used for the purpose of suppressing reverberation in a room or preventing noise. As an example of such a sound absorbing panel, there is a resonator type soundproof panel described in Patent Document 1.

  The resonator type soundproof panel described in Patent Document 1 includes a resonator corresponding to a so-called Helmholtz resonator. The resonator includes a hollow portion formed inside the panel and a slit that communicates the hollow portion with the outside. The opening end area and depth of the slit and the volume of the hollow portion are set to values according to the target frequency (resonance frequency).

  According to the resonator type soundproof panel, the sound energy of the target frequency can be absorbed into the hollow portion through the slit and attenuated to absorb the sound of that frequency.

JP-A-8-246421

  However, since the resonator type soundproof panel described in Patent Document 1 is integrally formed as a whole, it is difficult to change the sound absorption frequency according to the construction site.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a sound absorbing panel capable of easily changing a sound absorbing frequency according to a construction site.

In order to solve the above-described problems, the present invention provides a front wall in which a plurality of through holes are formed, a rear wall disposed to face the front wall, and a sound absorption between the front wall and the rear wall. A plurality of partition walls that divide the sound absorption space into a plurality of partition regions by connecting the front wall and the rear wall in a space, and at least one of the plurality of partition walls is the front wall and Ri non-fixed wall der detachably mountable to said rear wall, at least two of the plurality of partition walls are fixed wall fixed to the front wall and the rear wall, of the two said fixed wall The one fixed wall is fixed to one end side of each of the front wall and the rear wall, and the other fixed wall of the two fixed walls is the front wall and the rear wall. Fixed to the other end of each, the front wall, the rear wall And the two fixed walls constitute a rectangular tube-shaped outer shell, and each of the front wall and the rear wall is formed with an engaging portion with which the non-fixed wall is engaged, The non-fixed wall is detachable from the engaging portion of the front wall and the rear wall, and provides a sound absorbing panel.

According to the sound absorbing panel of the present invention, at least one of the plurality of partition walls is a non-fixed wall that can be attached to and detached from the front wall and the rear wall. By attaching and detaching the non-fixed wall to the front wall and the rear wall, the partition position of the sound absorption space can be changed, and the volume of the partition region can be changed. If the volume of the partition area is changed, the sound absorption frequency can be changed.
Further, according to the sound absorbing panel according to the present invention, the non-fixed wall is firmly attached to the front wall and the rear wall by engaging the non-fixed wall with the engaging portions formed on the front wall and the rear wall. Can do.
Further, according to the sound absorbing panel according to the present invention, the front wall and the rear wall are always supported by the fixed wall, so that the bending of the front wall and the rear wall can be suppressed. Therefore, it is possible to prevent the front wall and the rear wall from being bent and the interval between the front wall and the rear wall from fluctuating, making it difficult to attach and detach the unfixed wall to the front wall and the rear wall.
Therefore, the sound absorption frequency can be easily changed according to the construction site.

  In the present invention, it is preferable that a plurality of the fixing walls are provided and a plurality of the engaging portions are formed between the adjacent fixing walls.

  According to this configuration, a plurality of engaging portions are formed between the fixed wall and the fixed wall, and the position where the non-fixed wall is provided can be arbitrarily selected from among the engaging portions. Various positions can be changed. Therefore, the sound absorption frequency can be variously changed.

  In the present invention, the engaging portion includes a fitting groove formed in the front wall so that one end of the non-fixed wall is detachably slidably fitted, and the other end of the non-fixed wall is detachable. A fitting groove formed on the rear wall so as to be slidably engageable, and the fitting groove formed on the front wall and the fitting groove formed on the rear wall are opposed to each other. It is preferable that they are arranged.

  According to this configuration, the non-fixed wall can be easily attached and detached by sliding both end portions of the non-fixed wall with respect to the fitting groove.

  In the present invention, the non-fixed wall includes a first wall and a second wall that is orthogonal to the first wall and has a plurality of through holes. The front wall and the rear wall are connected by engaging a joint portion, and the second wall extends along the front wall in a state where the first wall connects the front wall and the rear wall. It is preferable that the sound absorbing space is partitioned into a plurality of partition regions in a direction that extends and is perpendicular to the front wall.

  According to this configuration, the sound absorbing space can be partitioned into a plurality of partition regions in a direction perpendicular to the front wall by the second wall in which the through hole is formed. As a result, sound is absorbed in a plurality of stages by the front wall side partition area and the rear wall side partition area partitioned by the second wall. Thereby, sound absorption efficiency can be improved.

  In this invention, it is preferable that the edge part of the said 2nd wall can be attached or detached to the engaging part formed in the side surface of the said fixed wall.

  According to this configuration, by engaging the end portion of the second wall with the engaging portion formed on the side surface of the fixed wall, vibration of the second wall due to sound pressure is suppressed, and sound absorption efficiency is increased. Can do.

  As described above, according to the present invention, it is possible to provide a sound absorbing panel capable of easily changing the sound absorbing frequency according to the construction site.

It is a perspective view which shows the structure of the sound absorption panel which concerns on 1st Embodiment of this invention, and is a figure which shows an example of arrangement | positioning of a non-fixed wall. It is a figure which shows the state which looked at a part of sound-absorbing panel shown by FIG. 1 from A direction. It is a perspective view which shows the example which changed arrangement | positioning of the non-fixed wall in the sound-absorbing panel which concerns on 1st Embodiment of this invention. It is a perspective view which shows the other example which changed arrangement | positioning of the non-fixed wall in the sound-absorbing panel which concerns on 1st Embodiment of this invention. It is a perspective view which shows the further another example which changed arrangement | positioning of the non-fixed wall in the sound-absorbing panel which concerns on 1st Embodiment of this invention. It is a perspective view which shows the example which does not arrange | position a non-fixed wall in the sound-absorbing panel which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the modification of the sound absorption panel which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the sound absorption panel which concerns on 2nd Embodiment of this invention. In the sound-absorption panel which concerns on 2nd Embodiment of this invention, it is a perspective view which shows the state before providing a sheet | seat member. It is a perspective view which shows the structure of the modification of the sound absorption panel which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the structure of the sound absorption panel which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the structure of the sound absorption panel which concerns on 4th Embodiment of this invention. It is a figure which shows the state which looked at a part of sound-absorbing panel shown by FIG. 12 from A direction. It is a perspective view which shows the modification 1 of the sound absorption panel which concerns on 4th Embodiment of this invention. It is a perspective view which shows the modification 2 of the sound absorption panel which concerns on 4th Embodiment of this invention. It is a perspective view which shows the modification 3 of the sound absorption panel which concerns on 4th Embodiment of this invention. It is a perspective view which shows the modification 4 of the sound absorption panel which concerns on 4th Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)
The sound absorbing panel 1 according to the first embodiment will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the sound absorbing panel 1 is a panel for absorbing sound, and includes a front wall 2, a rear wall 3, and a plurality of partition walls 5 and 6. The partition walls 5 and 6 include a fixed wall 5 fixed to the front wall 2 and the rear wall 3 and a non-fixed wall 6 removably attached to the front wall 2 and the rear wall 3. The front wall 2, the rear wall 3, and the two outermost fixed walls 5 form a rectangular tubular outer portion 15. A rectangular parallelepiped sound absorbing space SP surrounded by the outer shell 15 is formed between the front wall 2 and the rear wall 3. A rectangular opening OP is formed at both axial ends of the outer shell 15. In the example shown in FIG. 1, five fixed walls 5 and eight non-fixed walls 6 are provided. The fixed wall 5 and the non-fixed wall 6 partition the sound absorption space SP into a plurality of partition regions SP1 and partition the opening OP into a plurality of openings OP1.

  Hereinafter, each component will be described in detail.

  The front wall 2 is formed in a rectangular shape, for example, as shown in FIG. Examples of the material of the front wall 2 include synthetic resins such as polystyrene resin, polyethylene resin, and vinyl chloride resin, and inorganic materials such as metal, but are not particularly limited. The same applies to the material of the rear wall 3 and the partition walls 5 and 6. A plurality of through holes 8 are formed in the front wall 2. The through-hole 8 is for guiding external sound into the sound-absorbing panel 1 and absorbing sound due to energy loss when the sound passes through the through-hole 8. The shape of the front wall 2 is not limited to a rectangular shape, and may be other shapes such as a square shape.

  The front wall 2 is arranged in parallel to each other so as to face the rear wall 3. An end portion of the fixed wall 5 is integrally formed on a surface of the front wall 2 on the rear wall 3 side (hereinafter referred to as “an inner surface of the front wall 2”). Each fixed wall 5 extends along the axial direction of the outer shell portion 15 (the short direction of the front wall 2). The fixed walls 5 are arranged in the longitudinal direction of the front wall 2.

  A plurality of fitting grooves 7 are formed on the inner surface of the front wall 2 to slidably fit one end of the non-fixed wall 6 in a detachable manner. The fitting groove 7 extends along the axial direction of the outer shell portion 15. The fitting groove 7 is a groove formed between two parallel ridges 9 and 9 formed on the inner surface of the front wall 2. The ridges 9, 9 extend along the axial direction of the outer shell 15. Although the number of the fitting grooves 7 is not particularly limited, in the example shown in FIG. 1, three fitting grooves 7 are formed between the adjacent fixed walls 5 and 5. Thereby, the three non-fixed walls 6 can be attached between the adjacent fixed walls 5 and 5.

  The fitting grooves 7 are adjacent to each other at a plurality of locations. The spacing S between the fitting grooves 7 is the same at any location where the fitting grooves 7 are adjacent (see FIG. 2). Moreover, the fixed wall 5 is located next to the fitting groove 7 in a plurality of places. In any place where the fixed wall 5 is located next to the fitting groove 7, the interval between the fitting groove 7 and the fixing wall 5 is the same as the interval S between the fitting grooves 7 (see FIG. 2).

  The rear wall 3 is formed in the same shape and size as the front wall 2. A through hole may or may not be formed in the rear wall 3 as shown in FIG. On the surface of the rear wall 3 on the front wall 2 side, a fitting groove 7 is formed at a position facing the fitting groove 7 formed on the front wall 2. The fitting groove 7 formed in the front wall 2 and the fitting groove 7 formed in the rear wall 3 are opposed to each other, and a pair of fitting grooves 7 (hereinafter referred to as “fitting” is formed by the opposed fitting grooves 7. (Referred to as a groove pair 7, 7 "). The plurality of fitting groove pairs 7 and 7 are arranged side by side in the longitudinal direction of the front wall 2 and the rear wall 3, that is, in the direction perpendicular to the axis of the outer shell portion 15.

  For example, the fixed wall 5 is formed in a rectangular shape as shown in FIG. Both ends of the fixed wall 5 are integrally formed with the front wall 2 and the rear wall 3. Each fixed wall 5 extends along the short direction of the front wall 2 and is arranged in the longitudinal direction of the front wall 2. The fixed walls 5 are arranged in parallel to each other. The two fixed walls 5 located on the outermost sides connect the short sides of the front wall 2 and the rear wall 3. The fixed wall 5 is not provided between the long side of the front wall 2 and the long side of the rear wall 3.

  Both ends of the non-fixed wall 6 are slidably fitted in fitting groove pairs 7 and 7 formed in the front wall 2 and the rear wall 3. The distance between the end on the front wall 2 side and the end on the rear wall 3 side of the non-fixed wall 6 is substantially equal to the distance between the fitting grooves 7 in the fitting groove pairs 7 and 7. Each non-fixed wall 6 extends along the short direction of the front wall 2 and is arranged in the longitudinal direction of the front wall 2 in a state of being attached to the pair of fitting grooves 7 and 7.

  By aligning both ends of the non-fixed wall 6 with the fitting groove pair 7, 7 and pushing the end of the non-fixed wall 6 into the fitting groove pair 7, 7 while sliding with respect to the fitting groove 7, The non-fixed wall 6 can be attached to the fitting groove pair 7, 7. Further, the non-fixed wall 6 can be removed from the fitting groove pair 7, 7 by sliding the non-fixed wall 6 with respect to the fitting groove pair 7, 7 and pulling it out from the fitting groove pair 7, 7.

  In the example shown in FIG. 1, the fixed wall 5 and the non-fixed wall 6 partition the sound absorption space SP into 12 partition regions SP1 along the longitudinal direction of the front wall 2 and the rear wall 3. A non-fixed wall 6 is fitted in the third to tenth fitting groove pairs 7 and 7 from the left in FIG. The non-fixed wall 6 is not fitted in the first, second, eleventh, and twelfth fitting groove pairs 7 and 7 from the left. Therefore, when the interval between the adjacent fitting grooves 7 is S, the partition region SP1 (1 piece) having a width 3S, the partition region SP1 (10 pieces) having a width S, and the partition region SP1 having a width 3S in this order from the left. (1) is formed.

  Each partition region SP1 and the through hole 8 constitute a so-called Helmholtz resonator.

  Sound generated outside the sound absorbing panel 1 is transmitted to each of the plurality of partition regions SP1 through the plurality of through holes 8. Each partition region SP1 has a specific resonance frequency according to its volume, the diameter and depth of the through-hole 8, etc., and mainly resonates the sound of the resonance frequency and converts the sound energy into heat energy. . Thereby, in each partition area SP1, sounds near the resonance frequency are mainly absorbed.

  Since the plurality of partitioned areas SP1 shown in FIG. 1 are not unified in volume, they can exhibit a sound absorbing effect on sounds in a plurality of frequency bands. As a result, a sound absorption effect can be exhibited in a wide frequency band.

  Next, a method for changing the arrangement of the non-fixed walls 6 from the state shown in FIG. 1 will be described.

  In the example shown in FIG. 3, the non-fixed walls 6 are attached to the third, fifth, and tenth fitting groove pairs 7 and 7 from the left. To change from the state shown in FIG. 1 to the state shown in FIG. 3, the non-fixed wall 6 is slid out of the fourth, sixth, seventh, and ninth fitting groove pairs 7 and 7 from the left in FIG. That's fine. As a result, as shown in FIG. 3, from the left, a partition area having a width 3S (one), a partition area having a width S (one), a partition area having a width 2S (four), and a partition area having a width S A partition area (one) having (one) and a width of 3S is formed.

  As in the case of FIG. 1, the plurality of partitioned regions shown in FIG. 3 are not unified in volume, and therefore can exhibit a sound absorbing effect in a wide frequency band.

  In the example shown in FIG. 4, the non-fixed walls 6 are attached to the first to twelfth (all) fitting groove pairs 7 and 7 from the left. In order to change from the state shown in FIG. 1 to the state shown in FIG. 4, the non-fixed wall 6 is slide-fitted into the first, second, eleventh, and twelfth fitting groove pairs 7 and 7 from the left shown in FIG. Good. As a result, as shown in FIG. 4, partitioned areas (16 pieces) having a width S are formed in order from the left.

  Since the plurality of partitioned regions shown in FIG. 4 are unified in a small volume, the sound absorbing effect can be exerted intensively with respect to the sound in a high frequency band.

  In the example shown in FIG. 5, the non-fixed walls 6 are attached to the second, fifth, eighth, and eleventh fitting groove pairs 7, 7 from the left. To change from the state shown in FIG. 1 to the state shown in FIG. 5, the non-fixed wall 6 is slid from the third, fourth, sixth, seventh, ninth and tenth fitting groove pairs 7 and 7 from the left shown in FIG. The non-fixed wall 6 may be slid and fitted into the second and eleventh fitting groove pairs 7 and 7 from the left. As a result, as shown in FIG. 5, partitioned areas (eight) having a width of 2S are formed in order from the left.

  The volume of the plurality of partitioned regions shown in FIG. 5 is unified to a volume larger than that in FIG. 4, so that the sound absorption effect can be exerted intensively for sounds in a frequency band lower than that in FIG. 4.

  In the example shown in FIG. 6, the non-fixed wall 6 is not attached. To change from the state shown in FIG. 1 to the state shown in FIG. 6, the non-fixed wall 6 may be slid out of the third to tenth fitting groove pairs 7 and 7 shown in FIG. Thereby, the partition area | region (4 pieces) of width 3S is formed in an order from the left.

  Since the plurality of partitioned regions shown in FIG. 6 are unified in volume larger than that in FIG. 5, the sound absorption effect can be exerted intensively with respect to the sound in the frequency band lower than that in FIG.

  As described above, according to the sound absorption panel 1 according to the present embodiment, the partition position of the sound absorption space SP is changed by sliding the non-fixed wall 6 with respect to the fitting groove pairs 7 and 7 to be attached and detached. Thus, partition areas SP1 having various sizes can be formed. Thereby, the sound absorption frequency of the sound absorption panel 1 can be easily changed according to a construction site.

  As shown in FIG. 7, a front wall 2 </ b> A may be provided instead of the front wall 2. The front wall 2A is formed with through holes 8A having a smaller diameter and higher density than the through holes 8 shown in FIG. Also in the sound absorbing panel 1A having such a through hole 8A, the sound absorbing frequency of the sound absorbing panel 1 can be easily changed according to the construction site.

(Second Embodiment)
The sound absorbing panel 1B according to the second embodiment will be described with reference to FIGS. About the structure similar to 1st Embodiment, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  In the sound absorbing panel 1B, a sheet member 10 (see FIG. 8) in which a plurality of through holes 11 are formed is mounted on the surface of the front wall 2B (see FIG. 9). A plurality of communication grooves 12 are formed in the front wall 2B. The communication groove 12 extends in a direction intersecting with the fixed wall 5 and the non-fixed wall 6 (longitudinal direction of the front wall 2B). The communication groove 12 communicates the external space and each partitioned region partitioned by the fixed wall 5 and the non-fixed wall 6 through the through hole 11 in a state where the seat member 10 is mounted on the front wall 2B. The broken line in FIG. 8 is a line indicating the position of the communication groove 12.

  Sound generated outside the sound absorbing panel 1 </ b> B is transmitted to each of the plurality of partition regions via the through hole 11 and the communication groove 12. Each partition area converts sound energy into heat energy as in the first embodiment. Thereby, a sound is absorbed in each division area.

  Also in the sound absorbing panel 1B, the sound absorbing frequency can be easily changed according to the construction site.

  As shown in FIG. 10, a sheet member 10 </ b> C may be provided instead of the sheet member 10. The sheet member 10 </ b> C has through holes 11 </ b> C having a smaller diameter and higher density than the through holes 11 shown in FIG. 8. Also in the sound absorbing panel 1C having such a through hole 11C, the sound absorbing frequency can be easily changed according to the construction site.

(Third embodiment)
A sound absorbing panel 1D according to the third embodiment will be described with reference to FIG. About the structure similar to 1st Embodiment, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  In the sound absorbing panel 1D, a plurality of through holes 13 are formed in the non-fixed wall 6D. By forming the plurality of through holes 13 in the non-fixed wall 6 </ b> D, the sound transmitted into each partition region via the through hole 8 is transmitted to the adjacent partition region via the through hole 13. Thereby, sound absorption is performed in a plurality of stages through a plurality of partitioned regions, and sound absorption efficiency can be improved. Moreover, also in this sound absorption panel 1D, a sound absorption frequency can be easily changed according to a construction site.

(Fourth embodiment)
A sound absorbing panel 1E according to the fourth embodiment will be described with reference to FIGS. About the structure similar to 1st Embodiment, the same referential mark is attached | subjected and the description is abbreviate | omitted.

  In the sound absorbing panel 1E, the non-fixed wall 6E has a first wall 6e1 and a second wall 6e2. Both ends of the first wall 6e1 can be attached to and detached from the fitting groove pairs 7,7. The first wall 6e1 connects the front wall 2 and the rear wall 3 in a state where both ends are fitted in the fitting groove pairs 7 and 7, and the sound absorption space SP is divided into a plurality of partition regions SP1 along the front wall 2. Partition.

  The second wall 6e2 is orthogonal to the first wall 6e1 and has a plurality of through holes 14. The second wall 6e2 extends along the front wall 2 in a state where both end portions of the first wall 6e1 are fitted in the fitting groove pairs 7 and 7. The second wall 6e2 partitions the sound absorption space SP into a plurality of partition regions SP1 in a direction perpendicular to the front wall 2.

  According to the sound absorbing panel 1E, the sound absorbing space SP can be partitioned into a plurality of partitioned regions SP1 in a direction perpendicular to the front wall 2 by the second wall 6e2 in which the through holes 14 are formed. Thereby, the sound is absorbed in two stages by the partition area SP1 on the front wall 2 side partitioned by the second wall 6e2 and the partition area SP1 on the rear wall 3 side. Thereby, sound absorption efficiency can be improved.

  The fourth embodiment is not limited to the examples shown in FIGS. For example, a fitting groove (not shown) may be formed on the side surface of the fixed wall 5 so that the end of the second wall 6e2 can be slidably fitted into the fitting groove. By fitting the end of the second wall 6e2 into the fitting groove formed in the fixed wall 5, the second wall 6e2 is suppressed from vibrating due to the sound pressure, and the sound absorption efficiency can be increased.

  Moreover, the structure of a non-fixed wall is not restricted to the example shown in FIG.

  For example, the diameter of the through hole 14 may be changed. By changing the hole diameter, the sound absorption frequency can be variously changed.

  The non-fixed wall 6F shown in FIG. 14 includes three first walls 6f1 arranged in parallel to each other, and one second wall 6f2 orthogonal to the central portion of each first wall 6f1. Each first wall 6f1 is formed in the same size. A plurality of through holes (not shown) are formed in the second wall 6f2. The sound absorbing space surrounded by the front wall 2, the rear wall 3, and the two fixed walls 5 can be partitioned into eight partition regions SP1 by the non-fixed wall 6F.

  The non-fixed wall 6G shown in FIG. 15 includes one first wall 6g1 and two second walls 6g2 orthogonal to two locations of the first wall 6g1. Each second wall 6g2 is formed in the same size. A plurality of through holes (not shown) are formed in each second wall 6g2. The sound absorption space surrounded by the front wall 2, the rear wall 3, and the two fixed walls 5 can be partitioned into six partition regions SP1 by the non-fixed wall 6G.

  In the example shown in FIG. 15, one fitting groove pair 7, 7 is provided between the adjacent fixed walls 5, but as in FIG. 14, three fitting groove pairs 7, 7 are provided. May be.

  The non-fixed wall 6H shown in FIG. 16 includes one first wall 6h1 and three second walls 6h2 orthogonal to three locations of the first wall 6h1. Each second wall 6h2 is formed in the same size. A plurality of through holes (not shown) are formed in each second wall 6h2. The sound absorbing space surrounded by the front wall 2, the rear wall 3, and the two fixed walls 5 can be partitioned into eight partition regions SP1 by the non-fixed wall 6H.

  The non-fixed wall 6I shown in FIG. 17 includes a first wall 6i1, two second walls 6i2 orthogonal to two locations of the first wall 6i1, and two third walls 6i3. Each second wall 6i2 is formed in the same size. The third wall 6i3 connects the two second walls 6i2 on the left and right sides of the first wall 6i1. A plurality of through holes (not shown) are formed in each second wall 6i2 and each third wall 6i3. With each non-fixed wall 6I, the sound absorption space surrounded by the front wall 2, the rear wall 3, and the two fixed walls 5 can be partitioned into eight partitioned regions SP1.

  If the shape of the non-fixed wall is changed as shown in FIGS. 14 to 17, the sound absorption frequency can be changed in various ways according to the construction site.

  In addition, in each said embodiment, although the partition wall which comprises an outline part is made into the fixed wall 5, it is not restricted to this. The partition wall constituting the outer portion may be a non-fixed wall 6 that can be attached to and detached from the engaging portions formed on the front wall 2 and the rear wall 3.

  Moreover, in each said embodiment, although the edge part of the non-fixed wall is fitted in the fitting groove 7, it is not restricted to this. For example, a fitting groove may be formed at both ends of the non-fixed wall, a protrusion may be formed on the front wall and the rear wall, and the protrusion may be detachably fitted into the fitting groove. In addition to forming hook-shaped engaging portions on both ends of the non-fixed wall, hook-shaped engaging portions are also formed on the front wall and the rear wall, and these engaging portions are detachably engaged with each other. Also good. Further, the non-fixed wall may be detachable from the front wall and the rear wall by means of attachment / detachment means other than engagement, for example, a magnet.

  Moreover, you may change the thickness of the non-fixed wall which has a through-hole. By changing the thickness of the non-fixed wall having the through hole, the depth of the through hole is changed, and the sound absorption frequency can be further diversified.

  Moreover, in each said embodiment, although the fixed wall is provided, it is not necessary to provide a fixed wall (all the partition walls are good also as a non-fixed wall).

  In each of the above embodiments, the opening OP is formed at both ends of the outer shell 15. A non-fixed wall (not shown) that closes the opening OP can be attached to and detached from the front wall and the rear wall. You may attach to. The sound absorbing effect can be enhanced by closing the opening OP.

  The non-fixed wall may be detachable from the front wall and the rear wall at least when the sound absorbing panel is assembled, and may be fixed to the front wall and the rear wall by a fixing means such as an adhesive after the assembly is completed.

1,1A-1E Sound absorbing panel 2,2A, 2B Front wall 3 Rear wall 5 Fixed wall (partition wall)
6,6E-6I Non-fixed wall (partition wall)
6e1 to 6i1 first wall 6e2 to 6i2 second wall 6i3 third wall 7 fitting groove 8, 8A front wall through hole 9 ridge 10, 10C sheet member 11, 11C sheet member through hole 12 communication groove 13 non-fixed Wall through-hole 14 Second wall through-hole 15 Outer part OP, OP1 Opening part SP Sound absorption space SP1 Partition area

Claims (5)

A front wall formed with a plurality of through holes;
A rear wall disposed opposite the front wall;
In the sound absorbing space between the front wall and the rear wall, by connecting the front wall and the rear wall, a plurality of partition walls that partition the sound absorbing space into a plurality of partition regions,
At least one of the plurality of the partition walls, the Ri front wall and non-fixed wall der detachably mountable to said rear wall, at least two of the plurality of partition walls, the front wall and the rear wall A fixed wall fixed,
The one fixed wall of the two fixed walls is fixed to one end side of each of the front wall and the rear wall, and the other fixed wall of the two fixed walls is Fixed to the other end of each of the front wall and the rear wall;
The front wall, the rear wall, and the two fixed walls constitute a rectangular tube-shaped outer shell,
Each of the front wall and the rear wall is formed with an engaging portion with which the non-fixed wall is engaged,
The sound absorbing panel, wherein the non-fixed wall is detachable with respect to the engaging portions of the front wall and the rear wall . The engaging portion is
A fitting groove formed in the front wall so that one end of the non-fixed wall is detachably slidably fitted;
A fitting groove formed on the rear wall so that the other end of the non-fixed wall is slidably detachably fitted;
The sound absorbing panel according to claim 1 , wherein the fitting groove formed on the front wall and the fitting groove formed on the rear wall are arranged to face each other. Wherein the mutually opposing faces of the front wall and the rear wall, and a plurality of the engaging portion between the stationary wall adjacent is formed, according to claim 1 or claim 2 Sound absorbing panel. The non-fixed wall includes a first wall and a second wall that is orthogonal to the first wall and has a plurality of through holes,
The first wall connects the front wall and the rear wall by engaging both ends of the first wall with the engaging portion.
The second wall extends along the front wall in a state where the first wall connects the front wall and the rear wall, and the sound absorbing space is divided into a plurality of partition regions in a direction perpendicular to the front wall. The sound absorbing panel according to any one of claims 1 to 3 , wherein the sound absorbing panel is partitioned. The sound absorbing panel according to claim 4 , wherein an end portion of the second wall is detachable from an engaging portion formed on a side surface of the fixed wall.

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