JP2017134236A - Sound absorbing structure and method of installing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorbing structure capable of absorbing sound in various frequency ranges without losing design unity.SOLUTION: A sound absorbing structure makes use of Helmholtz resonators, and each resonator body member 20 includes partitioning wall members 29 for partitioning an internal space thereof. Each partitioning wall member 29 is an airtight material that is installed on a resonator body member 20 side to be in contact with a counter surface. At least one of the spaces partitioned by the partitioning wall members 29 becomes an acoustic chamber that functions as a Helmholtz resonator.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a sound absorbing structure attached to a ceiling or a wall surface and a method for installing the sound absorbing structure.

  Conventionally, a sound absorbing structure that absorbs sound using the principle of a Helmholtz resonator is known. Such Helmholtz resonators are generally configured using a perforated plate with a large number of air holes, and sound in a predetermined frequency range defined by the diameter of the air holes and the volume of the sound absorbing chamber is generated inside the sound absorbing structure. Resonance occurs when the air enters, and frictional heat is generated by the vibration of the air hole part, and a part of vibration energy is converted into heat energy to produce a sound absorbing action. It is defined by the diameter of the hole and the volume of the sound absorption chamber.

  In order to arrange a sound absorbing structure using such a Helmholtz resonator on a ceiling surface or the like, for example, a structure as described in Patent Document 1 can be used. That is, Patent Document 1 discloses that a strip or a protrusion projecting to the upper surface side of the bottom surface portion by denting the lower surface side of the bottom surface portion into a longitudinal required portion of the bottom surface portion of the main body having a groove shape with an upper opening. A plurality of protruding protrusions are provided, and a sound absorbing hole is provided in parallel on the top surface of the protruding protrusion, and a connecting protrusion is provided in the longitudinal direction on one of the outer side surfaces of the main body. And the ceiling material which provided the insertion groove part which can insert the front-end | tip edge part of this connection protrusion in the other side wall outer surface part of the main body is disclosed. By applying the structure described in Patent Document 1 and providing a sound absorbing chamber closed on the back side of the hole, a sound absorbing structure using a Helmholtz resonator can be arranged on the ceiling surface or the like.

Japanese Utility Model Publication No. 63-8309

  However, in the sound absorbing structure as described above, there is a problem that even if a plurality of sound absorbing chambers are provided, the volume of each sound absorbing chamber is the same, so that the frequency range in which sound can be absorbed is limited. The volume of the sound absorbing chamber can be changed by forming the sound absorbing chambers to have different external shapes. However, if the external shapes are different, the unity of the design is lost, so the design is poor. In addition, there is a problem that the number of parts increases and costs increase.

  Then, this invention makes it a subject to provide the sound-absorbing structure which can absorb sound corresponding to various frequency ranges, without losing the sense of unity of a design.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

  The invention according to claim 1 is a sound absorbing structure using a Helmholtz resonator, having a substantially U-shaped resonator main body having a pair of side walls and a front wall portion connecting the side walls, and the resonator main body Partition material for partitioning the internal space of the material, the resonator body material is attached so that the substantially U-shaped opening faces the housing side, the partition material is the housing side or the resonance An airtight material that is attached to the container main body and contacts the opposite surface, and at least one of the spaces partitioned by the partition material is a sound absorption chamber that functions as a Helmholtz resonator with an air opening. It is characterized by that.

  The invention according to claim 2 is characterized in that, in addition to the feature of the invention according to claim 1, at least one of the side walls of the resonator main body is provided with a gap between the tip and the housing side. And the gap serves as an air port of the Helmholtz resonator.

  The invention according to claim 3 is characterized in that, in addition to the features of the invention according to claim 1 or 2, a plurality of attachment portions for the partition material are provided in the internal space of the resonator body material. It is characterized by.

  In addition to the features of the invention according to any one of claims 1 to 3, the invention according to claim 4 is a panel member fixed to the housing side, a receiving member attached to the panel member, The resonator main body material is fixed to the receiving member.

  According to a fifth aspect of the present invention, in addition to the feature of the fourth aspect of the present invention described above, the surface of the panel material is provided with a recess for guiding the receiving member to a fixed position. Features.

  The invention described in claim 6 is characterized in that, in addition to the feature of the invention described in claim 4 or 5, a leg portion is provided on the back surface of the panel material, and the leg portion is brought into contact with the housing side. Features.

  The invention according to claim 7 is the fall prevention means for connecting the resonator body material directly or indirectly to the housing side in addition to the features of the invention according to any one of claims 1 to 6. It is characterized by providing.

  The invention described in claim 8 is characterized in that a decorative groove is provided on the surface of the resonator body material in addition to the feature of the invention described in any of claims 1-7.

  The invention according to claim 9 is characterized in that, in addition to the features of the invention according to any one of claims 1 to 7 described above, the surface of the resonator body material is flattened, and a cosmetic material is pasted on the surface. It is characterized by.

  The invention according to claim 10 is characterized in that, in addition to the feature of the invention according to any one of claims 1 to 9, a plurality of the partition materials are fixed at an arbitrary interval inside the resonator body material. To do.

  In addition to the features of the invention according to any one of claims 1 to 10, the invention according to claim 11 includes a plurality of the resonator body materials so that the resonator body materials that absorb different frequencies are adjacent to each other. Are arranged at arbitrary intervals on the housing side.

  According to a twelfth aspect of the present invention, there is provided a resonator body material having a substantially U-shaped cross section, a partition wall material for partitioning an internal space of the resonator body material, and for fixing the resonator body material to the housing side. A sound absorbing structure using a Helmholtz resonator including a receiving member, a step of fixing the receiving member to the housing side, and a step of attaching a partition material to the housing side or the resonator body material side And a step of fitting and fixing the receiving member and the resonator body material, and at least one of the spaces defined by the partition material is a sound absorption chamber that functions as a Helmholtz resonator. It is characterized by.

  The invention according to claim 1 is as described above, and includes a partition wall material for partitioning the internal space of the resonator body material, and the partition wall material is attached to the housing side or the resonator body material side and is provided on the opposing surface. At least one of the spaces that are airtight members that are in contact with each other and partitioned by the partition wall material is a sound absorption chamber that functions as a Helmholtz resonator with an air opening. According to such a configuration, the volume of the sound absorbing chamber can be changed by the partition material, so that sound can be absorbed in various frequency ranges without losing the sense of unity of the design.

Further, since the sound absorbing structure uses a Helmholtz resonator, a sound absorbing material such as glass wool is unnecessary. Since glass wool is not used, it does not need to be treated as industrial waste and is excellent in recyclability.
Moreover, since the partition material is an airtight material, the airtightness of the sound absorption chamber is increased, and the sound absorption effect can be improved.

  The invention according to claim 2 is as described above, and at least one of the side walls of the resonator main body is disposed with a gap between a tip and the housing side, and the gap Becomes the air port of the Helmholtz resonator. According to such a configuration, since the gap provided between the front end of the side wall and the housing side functions as an air port of the Helmholtz resonator, there is no labor for drilling, and processing costs can be reduced. Furthermore, since the air port of the Helmholtz resonator is opened on the side wall, the air port can be provided at a position that is difficult to visually recognize from the outside, and thus the design is good.

  The invention according to claim 3 is as described above, and a plurality of attachment portions for the partition wall material are provided in the internal space of the resonator body material. According to such a configuration, it is possible to easily change the volume of the sound absorbing chamber according to the frequency range of the sound absorbing object by simply changing the mounting position of the partition wall material. Further, since it is possible to absorb various frequency ranges with the same shape material without manufacturing a shape material having a different volume of the sound absorption chamber, it is not necessary to manufacture a plurality of molds, and the manufacturing cost can be suppressed.

  The invention according to claim 4 is as described above, and includes a panel member fixed to the housing side and a receiving member attached to the panel member, and the resonator body member is provided on the receiving member. Fixed. According to such a configuration, it is possible to attach the sound absorbing structure even at a location not provided with a flat surface, and it is possible to widen the usage range because the installation location of the sound absorbing structure is not selected. Moreover, since it is also possible to attach a Helmholtz resonator as an accent of the panel material, the design can be improved by using the sound absorbing structure as a cosmetic material. If the color of the sound absorbing structure is changed by painting or a sheet, the design can be further improved.

  The invention according to claim 5 is as described above, and a recess for guiding the receiving member to a fixed position is provided on the surface of the panel material. According to such a structure, a receiving member can be easily attached by using a recessed part as a guide.

  Further, the invention according to claim 6 is as described above, and a leg portion is provided on the back surface of the panel material, and the leg portion is brought into contact with the housing side. According to such a structure, when stopping a receiving member on a panel material with stoppers, such as a screw, a dent can be prevented by supporting with a leg part. That is, when the panel material is recessed, there is a possibility that the resonator body material and the receiving member cannot be reliably joined, but such a phenomenon can be suppressed.

  The invention according to claim 7 is as described above, and includes fall prevention means for connecting the resonator body material directly or indirectly to the housing side. According to such a configuration, even if the resonator body material is removed, the resonator body material can be prevented from falling.

  The invention according to claim 8 is as described above, and a decorative groove is provided on a surface of the resonator body material. According to such a configuration, even when an appearance defect such as a structure streak occurs due to the protruding locking piece for mounting on the resonator body material, it is difficult to visually recognize the appearance defect such as a streak by the decorative groove. As a result, designability is not impaired.

  The invention according to claim 9 is as described above, and the surface of the resonator main body is flattened, and a decorative material is attached to the surface. According to such a configuration, since the Helmholtz resonator can be attached as an accent of the panel material, the design can be improved by using the sound absorbing structure as a decorative material.

  Further, the invention according to claim 10 is as described above, and a plurality of the partition materials are fixed inside the resonator body material at an arbitrary interval. According to such a configuration, since the volume of the sound absorbing chamber can be changed depending on the position where the partition wall material is attached, sound absorption in various frequency ranges can be performed without losing the sense of unity of the design.

  The invention according to claim 11 is as described above, and a plurality of the resonator body materials are arranged at arbitrary intervals on the housing side so that the resonator body materials that absorb different frequencies are adjacent to each other. . According to such a configuration, it is possible to improve the sound absorption rate compared to arranging the resonator body materials that absorb sound at different frequencies for each frequency.

  Moreover, according to the invention of Claim 12, the above-described sound absorbing structure can be installed.

(A) The figure which arranged the sound-absorbing structure on the ceiling, (b) The figure which arranged the sound-absorbing structure on the wall. FIG. 2 is a view of the sound absorbing structure as viewed from the X direction in FIG. (A) The elements on larger scale of the A section in FIG. 2, (b) It is the BB sectional drawing in FIG. It is an exploded view of a sound absorption structure. (A) It is a front view of a resonator main body material, (b) It is a figure which shows a sound absorption structure (a receiving member is abbreviate | omitted). (A)-(e) is a figure which shows the example of a change of the attachment position of a partition material. It is a figure explaining the attachment method of a fall prevention means. It is a figure explaining the attachment method of another fall prevention means. It is a figure which shows the sound-absorbing structure which concerns on the modification 1 (a receiving member is abbreviate | omitted), Comprising: (a) The figure which shows the resonator main body material provided with the small refracting part, (b) The resonator main body provided with the large refracting part It is a figure which shows material. It is a figure which shows the sound-absorbing structure which concerns on the modification 2 (a receiving member is abbreviate | omitted), Comprising: (a)-(e) is a figure which shows the example of a change of the attachment position of a partition material.

  Embodiments of the present invention will be described with reference to the drawings.

  The sound absorbing structure according to this embodiment performs sound absorption using a Helmholtz resonator. The sound absorbing structure may be disposed on the ceiling surface as shown in FIG. 1 (a), or may be disposed on the wall surface as shown in FIG. 1 (b). In the following description, an example in which a sound absorbing structure is attached to the ceiling surface will be described.

  The sound absorbing structure in this embodiment is fixed in a rib shape to the base material 51 fixed to the ceiling surface of the building housing 50, the panel material 38 fixed to the lower part of the base material 51, and the panel material 38. The receiving member 10 is configured to include a resonator main body material 20 fitted to the receiving member 10, and a partition wall material 29 for partitioning the internal space of the resonator main body material 20. In addition, when attaching a sound absorption structure to a flat surface as shown in FIG.1 (b), you may abbreviate | omit the base material 51 and the panel material 38. FIG. In addition, the small lid 30 may be fixed to both ends of the resonator body material 20.

  As shown in FIGS. 2 and 3, the base material 51 is fixed to the lower surface of the receiving material 52 that is suspended and supported from the ceiling surface of the building housing 50, for example, and is fixed to the ceiling surface of the building housing 50.

  The panel member 38 is an extruded aluminum member that forms a flat surface by being fixed to the ceiling surface of the building housing 50 via the base member 51. As shown in FIGS. It is fixed with a screw etc. in the lower part of. In the present embodiment, since the ceiling is covered with the panel material 38, when a plurality of resonator body materials 20 to be described later are fixed at an arbitrary interval, an appearance like a spandrel is obtained (note that FIG. When the resonator body material 20 is attached without using the panel material 38 as shown in FIG.

  In the present embodiment, one receiving member 10 and the resonator main body 20 are formed to be attachable to one panel member 38. Therefore, when arranging a plurality of resonator body members 20 in parallel, a plurality of panel members 38 are connected and arranged in accordance with the number of resonator body members 20.

  As shown in FIGS. 3A and 5B, the panel material 38 has a groove-shaped recess 38 a formed on the surface (surface on which the receiving member 10 is fixed). The recess 38a is used as a guide for guiding the receiving member 10 to a fixed position. In addition, as shown in FIG. 9, you may provide the inclination part 38b in the both-sides edge of this recessed part 38a. If the inclined portion 38b is provided, the receiving member 10 can be easily introduced into the concave portion 38a, so that workability can be improved.

  Further, a leg portion 38 c is formed in a rib shape on the back surface (surface fixed to the base material 51) of the panel material 38, and the leg portion 38 c is in contact with the base material 51. The leg portion 38c is erected in the vicinity of the receiving member fixture 14 used for fixing the receiving member 10, and plays a role of receiving a load when the receiving member fixture 14 is tightened. That is, when the receiving member fixture 14 is tightened, an excessive load is applied to the panel member 38 to prevent a dent phenomenon.

  As shown in FIG. 4 and the like, the receiving member 10 is a short material fixed to the panel member 38 or the building frame 50 described above. The receiving member 10 includes a flat plate-like support portion 11 that is fixed in contact with the panel member 38 or the building housing 50, and a rising portion 12 that is formed to rise from both ends of the support portion 11 at a substantially right angle. It is an extruded shape made of aluminum having a substantially U-shaped cross section. The support portion 11 is formed with a width that fits into the recess 38 a of the panel material 38. The receiving member 10 can be fixed to the panel member 38 by fitting the supporting portion 11 into the concave portion 38 a and fixing it with the receiving member fixing tool 14.

  In addition, an engagement recess 12 a that is recessed inward is formed on the outer surface of the rising portion 12 of the receiving member 10. The engaging recess 12a is for engaging a locking claw 23a of a resonator body material 20 to be described later. By engaging the locking claw 23a, the resonator body material can be applied to the receiving member 10 with a single touch. 20 can be fitted and fixed. Further, the leading end portion 12b of the rising portion 12 is inclined inward as it goes in the leading end direction, so that it can easily enter the locking claw 23a of the resonator body material 20.

  A lid fixing screw hole 13 is formed on the inner surface side of the receiving member 10. The lid fixing screw hole 13 is for screwing a receiving member fixing screw 32 described later, and is provided inside the rising portion 12.

  The resonator body material 20 is a long material as shown in FIG. 4 and the like, and is fitted and fixed to the receiving member 10 described above. As shown in FIG. 5, the resonator main body material 20 is an aluminum extruded shape member having a pair of side walls 22 and a front wall portion 21 connecting the side walls 22 and having a substantially U-shaped cross section. The resonator body member 20 is attached to the receiving member 10 such that the substantially U-shaped opening faces the panel member 38 side or the building housing 50 side.

  On the inner side of the resonator main body 20, a pair of locking pieces 23 are formed so as to protrude substantially parallel to the side wall 22. The pair of locking pieces 23 are used for attachment to the receiving member 10, and are bent into a “<” shape at the middle portion to form a locking claw 23 a. When the resonator body material 20 is pressed against the receiving member 10 in order to attach the resonator body material 20, the locking piece 23 is elastically deformed so that the locking claw 23 a is against the engaging recess 12 a of the receiving member 10 described above. Engage with each other. Thereby, the resonator body 20 is attached to the receiving member 10.

  In addition, a lid fixing screw hole 25 for fixing a small-mouth cover 30 described later is provided inside the resonator body material 20.

  In addition, a plurality of attachment portions 24 each including a pair of protruding pieces substantially parallel to the side wall 22 are provided inside the resonator body material 20. The attachment portion 24 is for attaching a partition wall material 29 described later, and protrudes at a height of half or less of the side wall 22. The mounting portion 24 is provided over the entire length of the resonator body material 20 in the longitudinal direction. In the present embodiment, since a plurality of mounting portions 24 are provided (specifically, four rows), the mounting position of the partition wall material 29 can be changed by changing which mounting portion 24 is used. Has been.

  As shown in FIG. 4 and the like, the fore cover 30 is a plate-like aluminum member that covers the openings at both ends of the resonator body material 20. A fixing hole 30a is formed in the small mouth lid 30 so that the lid fixing screw 31 penetrated through the fixing hole 30a is screwed into the lid fixing screw hole 25 of the resonator body material 20, thereby reducing the small mouth. The lid 30 is fixed to the resonator body material 20.

  The partition material 29 is a long material as shown in FIG. 4 and is an airtight material formed of an elastic material such as rubber or resin. As shown in FIG. 5B, the partition wall material 29 according to the present embodiment protrudes in a ring shape in cross section from the fixing portion 29a which is pushed into the mounting portion 24 of the resonator body material 20 and attached. Elastic deformation portion 29b. In this partition wall material 29, a fixing portion 29a is attached to the resonator body material 20 side, and an elastic deformation portion 29b is in pressure contact with and in contact with the opposing surface (panel material 38 or building housing 50).

  In the sound absorbing structure as described above, since the substantially U-shaped opening of the resonator body member 20 faces the panel member 38 or the building housing 50, an internal space is formed in the resonator body member 20. This internal space is partitioned by a partition material 29. By making this partitioned space into a sound absorption chamber that functions as a Helmholtz resonator, sound absorption by the sound absorption structure is realized.

  The sound absorbing chamber is not completely shut off from the outside, and communicates with the outside through the air port K. Specifically, as shown in FIG. 5B, the side wall 22 of the resonator body member 20 is disposed with a gap between the tip and the panel member 38 on the building housing 50 side. Thus, the air port K of the Helmholtz resonator is opened in the side walls 22 of the resonator body 20. For this reason, as shown in FIG. 6, two sound absorbing chambers (first sound absorbing chamber S <b> 1 and second sound absorbing chamber S <b> 2) are formed on both sides of the resonator body material 20. Thus, the Helmholtz resonator is constituted by the first sound absorbing chamber S1, the second sound absorbing chamber S2, and the air port K, so that a predetermined sound absorbing effect can be obtained.

  Here, the frequency range in which the Helmholtz resonator can absorb sound varies depending on the volume of the sound absorbing chamber. For this reason, in order to absorb sound in various frequency ranges, it is preferable to change the volume of the sound absorbing chamber. In this regard, in the sound absorbing structure according to the present embodiment, as shown in FIGS. 6A to 6E, the volume of the sound absorbing chamber can be changed only by changing the position of the partition wall material 29. At this time, the volume of the sound absorbing chamber may be reduced by using two partition walls 29 as shown in FIG. 6 (a), or the partition wall 29 is removed as shown in FIG. 6 (b). Only one may be used to increase the volume of the sound absorption chamber as much as possible. Moreover, as shown to Fig.6 (a) etc., you may make the 1st sound absorption chamber S1 and the 2nd sound absorption chamber S2 into the same volume, and as shown to FIG.6 (b) etc., 1st sound absorption chamber S1. And the second sound absorbing chamber S2 may have different volumes (asymmetric).

  In addition, since the resonator body material 20 according to the present embodiment has the locking piece 23 protruding from the inside, an appearance defect such as a streak may occur during extrusion. For example, since the thickness of the front wall portion 21 changes due to the provision of the locking piece 23, a structure streak appears in a linear pattern in the extrusion direction due to the non-uniformity of the metal structure and alloy composition. However, there is a risk of deteriorating the design. In order to avoid such a problem, a decorative groove 27 may be provided on the surface of the resonator body material 20 as shown in FIG. By applying the decorative groove 27, even if an appearance defect such as a structure streak occurs, the appearance defect such as a streak can be made difficult to visually recognize by the decorative groove 27, so that the design is not impaired. Alternatively, the surface of the resonator body material 20 may be formed flat, and a cosmetic material may be attached to the flat surface.

  By the way, in this embodiment, the resonator main body material 20 is fixed to the receiving member 10 by engaging the locking claw 23a. In the unlikely event that this engagement is disengaged, the resonator body material 20 may fall, and therefore a fall prevention means for directly or indirectly connecting the receiving member 10 and the resonator body material 20 may be provided. .

  For example, as shown in FIG. 7, a fall prevention cord 33 may be provided as a fall prevention means. The fall prevention cord 33 is provided with ring-shaped fixing portions 33a at both ends. The fixing portion 33a at one end is fixed to the small lid 30 and the fixing portion 33a at the other end is fixed to the panel member 38. The receiving member 10 and the resonator body material 20 are indirectly coupled (in addition, the fixing portion 33a at one end is fixed to the resonator body material 20, and the receiving member 10 and the resonator body material 20 are directly connected to each other. When the sound absorbing structure is directly attached to a flat surface such as a wall, the fixing portion 33a at one end is fixed to the sound absorbing structure and the fixing portion 33a at the other end is fixed to a flat surface such as a wall. It may be fixed to the surface.)

  The procedure for attaching the fall prevention cord 33 is as follows. That is, first, as shown in FIG. 7A, the fixing portion 33a at one end of the fall prevention cord 33 is fixed to the fall prevention hole 30b of the fore cover 30 by a rope fixing tool 34 such as a screw. Thereafter, as shown in FIG. 7 (b), the fore cover 30 is fixed to the resonator body material 20. On the other hand, the receiving member 10 is fixed to the panel material 38. Then, as shown in FIG. 7C, the resonator main body material 20 is fitted and fixed to the receiving member 10, and the fixing portion 33a at the other end of the fall prevention cord 33 is fixed to the panel member 38 by a rope fixing tool 35 such as a screw. Secure to. Thereby, since the receiving member 10 and the resonator main body material 20 are connected via the fall prevention cord 33, even if the engagement between the receiving member 10 and the resonator main body material 20 is disengaged, the resonator The main body material 20 can be prevented from falling.

  Moreover, you may employ | adopt another aspect as a fall prevention means. For example, as shown in FIG. 8, you may use the fore cover 30 as a fall prevention means. In this case, a lid fixing screw hole 13 for fixing the small lid 30 to the receiving member 10 may be provided.

  The procedure for attaching the fall prevention means is as follows. That is, first, the receiving member 10 is fixed to the panel material 38. (When the sound absorbing structure is directly attached to a flat surface such as a wall, the receiving member 10 is fixed to the building housing 50.) Next, the resonator body 20 is fitted and fixed to the receiving member 10. The lid fixing screw 31 having the small lid 30 inserted through the fixing hole 30a is screwed into the lid fixing screw hole 25 of the resonator body material 20, and the receiving member fixing inserted through the receiving member fixing hole 30c of the small lid 30 is provided. The screw 32 is screwed into the lid fixing screw hole 13 of the receiving member 10, and the small edge lid 30 is fixed to the receiving member 10 and the resonator body material 20. Thereby, since the receiving member 10 and the resonator main body material 20 are connected via the small-mouth cover 30, the resonator main body material 20 can be prevented from falling.

  As described above, according to the present embodiment, the partition wall material 29 for partitioning the internal space of the resonator body material 20 is provided, and the partition wall material 29 is attached to the resonator body material 20 side and is provided on the opposing surface. At least one of the spaces which are airtight materials in contact with each other and partitioned by the partition wall material 29 is a sound absorption chamber functioning as a Helmholtz resonator. According to such a configuration, since the volume of the sound absorbing chamber can be changed by the partition wall material 29, it is possible to absorb sound in various frequency ranges without losing the sense of unity of the design.

Further, since the sound absorbing structure uses a Helmholtz resonator, a sound absorbing material such as glass wool is unnecessary. Since glass wool is not used, it does not need to be treated as industrial waste and is excellent in recyclability. Furthermore, in the embodiment, since the sound absorbing structure is made of aluminum, it specializes in recyclability.
Moreover, since the partition material 29 is an airtight material, the airtightness of the sound absorption chamber is increased, and the sound absorption effect can be improved.

  A plurality of attachment portions 24 for the partition wall material 29 are provided in the internal space of the resonator body material 20. According to such a configuration, the volume of the sound absorbing chamber can be easily changed in accordance with the frequency range of the sound absorbing object simply by changing the mounting position of the partition wall material 29. Further, since it is possible to absorb various frequency ranges with the same shape material without manufacturing a shape material having a different volume of the sound absorption chamber, it is not necessary to manufacture a plurality of molds, and the manufacturing cost can be suppressed.

  Further, the air port K of the Helmholtz resonator is opened on the side wall 22 of the resonator body material 20. According to such a configuration, since the air port K can be provided at a position that is difficult to visually recognize from the outside, the design is good, and further, the air port K is provided without performing the hole machining operation. Costs and labor can be reduced.

  Further, the panel member 38 fixed to the building housing 50 side and the receiving member 10 attached to the panel member 38 are provided, and the resonator body member 20 is fixed to the receiving member 10. According to such a configuration, it is possible to attach the sound absorbing structure even at a location not provided with a flat surface, and it is possible to widen the usage range because the installation location of the sound absorbing structure is not selected. Moreover, since it is also possible to attach a Helmholtz resonator as an accent of the panel material 38, the design can be improved by using the sound absorbing structure as a decorative material. If the color of the sound absorbing structure is changed by painting or a sheet, the design can be further improved.

  Further, a recess 38 a for guiding the receiving member 10 to a fixed position is provided on the surface of the panel member 38. According to such a configuration, the receiving member 10 can be easily attached by using the recess 38a as a guide.

  Further, leg portions 38 c are provided on the back surface of the panel material 38, and the leg portions 38 c are brought into contact with the base material 51. According to such a configuration, when the receiving member 10 is fixed to the panel member 38 with a stopper such as a screw, the dent can be prevented by supporting it with the leg portion 38c. That is, when the panel material 38 is recessed, there is a possibility that the resonator body material 20 and the receiving member 10 cannot be reliably joined, but such a phenomenon can be suppressed.

  In addition, a fall prevention means for directly or indirectly coupling the resonator body material 20 to the building housing 50 side is provided. According to such a configuration, even if the resonator body material 20 is removed, the resonator body material 20 can be prevented from dropping.

  As shown in FIG. 2 and the like, in the above-described embodiment, two types of resonator main body materials 20 that absorb sound at different frequencies are used, and these two types of resonator main body materials 20 are connected to the building housing 50 side. Are alternately arranged at arbitrary intervals. If a plurality of resonator body materials 20 are arranged at an arbitrary interval on the building housing 50 side so that the resonator body materials 20 that absorb different frequencies in this manner are adjacent to each other, resonance that absorbs different frequencies is achieved. The sound absorption rate can be improved as compared with the case where the main body 20 is arranged for each frequency.

(Modification 1)
In the above-described embodiment, the volume of the sound absorbing chamber is changed by changing the position of the partition wall material 29, and thereby the frequency range in which sound can be absorbed is adjusted. In this way, the frequency range in which sound can be absorbed may be adjusted by changing the shape of the air port K.

  That is, in this embodiment, as shown in FIG. 9, a resonator body material 20 having a different shape of the air port K is used. The resonator body member 20 shown in FIG. 9A is provided with small refracting portions 22a, with the ends of the side walls 22 on both sides bent slightly inward. On the other hand, the resonator main body material 20 shown in FIG. 9B has a large refracting portion 22a, with the tip of the left side wall 22 bent greatly inward. When other conditions of the sound absorbing chamber (such as the size of the air port K and the size (volume) of the sound absorbing chamber) are the same, the smaller the refracting portion 22a, the higher the sound can be absorbed. The larger the frequency, the lower the frequency of sound that can be absorbed. As described above, various frequency ranges may be absorbed by changing the length or the like of the refracting portion 22a.

In this modified example, a partition wall 28 having the same height protrudes inside the resonator body member 20 substantially in parallel with the side wall 22. A partition wall material 29 having an O-shaped cross section is attached to the tip of the partition wall 28. The partition material 29 is an airtight material formed of an elastic material such as rubber or resin, and is in pressure contact with the opposing surface (the panel material 38 or the building housing 50).
Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.

(Modification 2)
In the above-described embodiment, the example in which the partition wall material 29 is attached to the resonator body material 20 side has been described. However, the present invention is not limited thereto, and the partition wall material 29 may be attached to the base material 51. That is, as shown in FIG. 10, a plurality of mounting portions 38d are provided on the panel material 38, and the fixing portions 29a of the partition wall material 29 are pushed into the mounting portions 38d for mounting, and the elastic deformation portions 29b are opposed to each other (resonator body material). The 20 front wall portions 21) may be brought into pressure contact with each other.
Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Receiving member 11 Support part 12 Standing part 12a Engaging recessed part 12b Tip part 13 Lid hole for lid fixing 14 Receiving member fixing tool 20 Resonator body material 21 Front wall part 22 Side wall 22a Refraction part 23 Locking piece 23a Locking claw 24 Attachment Part 25 Screw hole for fixing the lid 27 Cosmetic groove 28 Partition part 29 Partition material 29a Fixing part 29b Elastic deformation part 30 Small lid 30a Fixing hole 30b Fall prevention hole 30c Receiving member fixing hole 31 Cover fixing screw 32 Receiving member fixing screw 33 Fall prevention rope (fall prevention means)
33a fixing part 34, 35 rope fixing tool 38 panel material 38a concave part 38b inclined part 38c leg part 38d mounting part 50 building frame 51 base material (ceiling frame)
52 Receiving Material K Air Port S1 First Sound Absorption Room S2 Second Sound Absorption Room

Claims (12)

A sound absorbing structure using a Helmholtz resonator,
A resonator body material having a substantially U-shaped cross section having a pair of side walls and a front wall portion connecting the side walls;
Partition material for partitioning the internal space of the resonator body material,
With
The resonator body material is attached so that the substantially U-shaped opening faces the housing side,
The partition material is an airtight material attached to the housing side or the resonator body material side and in contact with the opposing surface,
A sound absorbing structure, wherein at least one of the spaces defined by the partition material is a sound absorbing chamber functioning as a Helmholtz resonator having an air opening.   At least one of the side walls of the resonator main body is disposed with a gap between a tip and the housing side, and the gap serves as an air port of the Helmholtz resonator. Item 2. A sound absorbing structure according to Item 1.   The sound absorbing structure according to claim 1, wherein a plurality of attachment portions for the partition material are provided in the internal space of the resonator body material. A panel material fixed to the housing side;
A receiving member attached to the panel material;
With
The sound absorbing structure according to claim 1, wherein the resonator main body is fixed to the receiving member.   The sound absorbing structure according to claim 4, wherein a concave portion for guiding the receiving member to a fixed position is provided on a surface of the panel material.   The sound absorbing structure according to claim 4 or 5, wherein a leg portion is provided on a back surface of the panel material, and the leg portion is brought into contact with the housing side.   The sound absorbing structure according to any one of claims 1 to 6, further comprising fall prevention means for directly or indirectly coupling the resonator body material to the housing side.   The sound absorbing structure according to any one of claims 1 to 7, wherein a decorative groove is provided on a surface of the resonator body material.   The sound absorbing structure according to claim 1, wherein a surface of the resonator main body is flattened and a decorative material is attached to the surface.   The sound absorbing structure according to any one of claims 1 to 9, wherein a plurality of the partition materials are fixed at an arbitrary interval inside the resonator main body material.   The said resonator main body material which absorbs a different frequency is arrange | positioned in the said housing | casing side at arbitrary intervals so that the said resonator main body material may adjoin, The any one of Claims 1-10 characterized by the above-mentioned. Sound absorption structure. A resonator body material having a substantially U-shaped cross section;
Partition material for partitioning the internal space of the resonator body material,
A receiving member for fixing the resonator body material to the housing side;
A sound absorbing structure installation method using a Helmholtz resonator comprising:
Fixing the receiving member to the housing side;
Attaching a partition material to the housing side or the resonator body material side;
Fitting and fixing the receiving member and the resonator body material;
With
A method for installing a sound absorbing structure, wherein at least one of the spaces partitioned by the partition material is a sound absorbing chamber functioning as a Helmholtz resonator.

Images