JP2015102730A - Sound absorption structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorption structure capable of absorbing sound corresponding to various frequency ranges without losing a sense of design unity.SOLUTION: A sound absorption structure comprises: an acceptance member 10 fixed to a building frame 50 side; a resonator main unit material 20 fitted to the acceptance member 10; and small opening lids 30 fixed at both ends of the resonator main unit material 20. The resonator main unit material 20 has a substantially U-shaped cross-section. The small opening lids 30 cover both end openings of the resonator main unit material 20, and the acceptance member 10 is fitted to a longitudinal opening of the resonator main unit material 20 to form a Helmholtz resonator. A barrier plate extending in a longitudinal direction is provided inside the Helmholtz resonator.

Description

  The present invention relates to a sound absorbing structure using a Helmholtz resonator.

  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 is generated when entering, and frictional heat is generated by vibration of the air hole portion, and a part of the vibration energy is converted into heat energy, thereby producing a sound absorbing action.

  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.

(Claim 1)
The sound absorbing structure according to claim 1 is a sound absorbing structure using a Helmholtz resonator, wherein the receiving member is fixed to a building housing side, the resonator body material fitted to the receiving member, and the resonance Small resonator lids fixed to both ends of the resonator body material, the resonator body material is substantially U-shaped in cross section, and both ends of the resonator body material are covered with the small mouth lid, and the resonator A partition that extends in the longitudinal direction inside the Helmholtz resonator is formed by fitting the receiving member into a longitudinal opening of the main body material to form a sound absorbing chamber, opening an air port in the sound absorbing chamber to form a Helmholtz resonator. Is provided.

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.
That is, the partition wall is characterized in that the interior of the Helmholtz resonator is asymmetrically separated.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.
That is, the air opening is opened at the side of the receiving member.

(Claim 4)
The invention described in claim 4 is characterized by the following points in addition to the characteristics of the invention described in claim 3 described above.
That is, the panel material is fixed to the building frame side, and the receiving member is fixed to the flat surface of the panel material.

(Claim 5)
The invention described in claim 5 is characterized by the following points in addition to the characteristics of the invention described in claim 4 described above.
That is, a concave portion is provided on the surface of the panel material, and the receiving member is fixed to the concave portion.

(Claim 6)
The invention described in claim 6 is characterized by the following points in addition to the characteristics of the invention described in claim 4 or 5.
That is, a leg portion is provided on the back surface of the panel material, and the leg portion is brought into contact with the building frame side.

(Claim 7)
The invention described in claim 7 is characterized by the following points in addition to the characteristics of the invention described in any one of claims 1-6.
That is, a fall prevention means for directly or indirectly connecting the receiving member and the resonator body material is provided.

(Claim 8)
The invention described in claim 8 is characterized by the following points in addition to the characteristics of the invention described in any one of claims 1-7.
That is, a decorative groove is provided on the surface of the resonator body material.

  Invention of Claim 1 is as above, The receiving member fixed to the building skeleton side, The resonator main body material fitted to the said receiving member, The small edge fixed to the both ends of the said resonator main body material And the resonator body material has a substantially U-shaped cross section, and both ends of the resonator body material are covered with the small lid, and the receiving member is disposed in the longitudinal opening of the resonator body material. To form a sound absorbing chamber, an air opening is opened in the sound absorbing chamber to form a Helmholtz resonator, and a partition wall extending in the longitudinal direction is provided inside the Helmholtz resonator. The Helmholtz resonator can be easily manufactured simply by fitting the main body and attaching the small-mouth lid, so that workability is good. Moreover, since the volume of the sound absorption chamber can be changed by providing the partition wall, sound absorption in various frequency ranges is possible 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.

  Further, the invention according to claim 2 is as described above, and the partition walls asymmetrically separate the inside of the Helmholtz resonator, so that the sound absorption chambers can absorb sound in different frequency ranges.

  Further, the invention according to claim 3 is as described above, and since the air port of the Helmholtz resonator is opened at the side portion of the receiving member, the air port can be provided at a position that is difficult to visually recognize from the outside. , Good design.

  Further, the invention according to claim 4 is as described above, and the panel material is fixed to the building housing side, and the receiving member is fixed to the flat surface of the panel material. However, since the sound absorbing structure can be attached and the installation location of the sound absorbing structure is not selected, the use range can be expanded. 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.

  Further, the invention according to claim 5 is as described above, and since the concave portion is provided on the surface of the panel material and the receiving member is fixed to the concave portion, the receiving member can be easily attached by using the concave portion as a guide. be able to.

  Further, the invention according to claim 6 is as described above, and since the leg portion is provided on the back surface of the panel material and the leg portion is brought into contact with the building housing side, the receiving member is attached to the panel material such as a screw. When stopping with a stopper, 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 a fall prevention means for directly or indirectly connecting the receiving member and the resonator body material. Even if the fitting with the member is disengaged, the resonator body material can be prevented from falling.

  Further, the invention according to claim 8 is as described above, and since the decorative groove is provided on the surface of the resonator body material, when a partition wall or the like is formed on the back surface of the resonator body material, the structure streak etc. Even when the appearance defect is generated, it is difficult to visually recognize the appearance defect such as streak by the decorative groove, so that the design property is not impaired.

It is the figure which arrange | positioned the sound-absorbing structure on the ceiling and was seen from the bottom. FIG. 2 is a partially enlarged front view according to the first embodiment (a view seen from the direction A in FIG. 1, but omitting the fore cover). It is a partially expanded side view (figure seen from the B direction in FIG. 1) which concerns on 1st Embodiment. It is a partially expanded side view (figure seen from the C direction in FIG. 1) which concerns on 1st Embodiment. It is an exploded view of the sound absorption structure concerning a 1st embodiment. It is (a) front view of the resonator main body material which concerns on 1st Embodiment, (b) It is a bottom view. (A) (b) (c) is a figure explaining the attachment method of the fall prevention means which concerns on 1st Embodiment. It is a figure explaining the attachment method of another fall prevention means concerning a 1st embodiment. FIG. 4 is a partially enlarged front view according to the second embodiment (a view seen from the direction A in FIG. 1, but omitting the fore cover). It is a partially expanded side view (figure seen from the B direction in FIG. 1) which concerns on 2nd Embodiment. It is a partially expanded side view (figure seen from the C direction in FIG. 1) which concerns on 2nd Embodiment. It is an exploded view of the sound absorption structure concerning a 2nd embodiment. It is (a) front view of the resonator main body material which concerns on 2nd Embodiment, (b) It is a bottom view. (A) (b) (c) is a figure explaining the attachment method of the fall prevention means which concerns on 2nd Embodiment. It is a figure explaining the attachment method of another fall prevention means concerning a 2nd embodiment.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  The sound absorbing structure according to the present embodiment absorbs sound using a Helmholtz resonator. In the present embodiment, the sound absorbing structure is disposed on an indoor ceiling surface as shown in FIG. The sound absorbing structure includes a base material 35 fixed to the ceiling surface of the building housing 50, a panel material 38 fixed to the lower part of the base material 35, and the receiving member 10 fixed to the panel material 38 in a rib shape. And a resonator main body 20 fitted to the receiving member 10 and a fore cover 30 fixed to both ends of the resonator main body 20.

  2 to 4, for example, the base material 35 is fixed to the lower surface of the receiving material 39 that is suspended and supported by the hanger 40 from the ceiling surface of the building housing 50, and is fixed to the ceiling surface of the building housing 50.

  The panel material 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 material 35. As shown in FIGS. It is fixed at the bottom with screws. In the present embodiment, since the ceiling portion is covered with the panel material 38, an appearance like a spandrel is obtained when a resonator main body material 20 described later is attached.

  As shown in FIG. 2, the panel member 38 has a groove-shaped recess 38 b formed on a surface 38 a (surface on which the receiving member 10 is fixed). The recess 38b is used as a guide for fixing the receiving member 10. Further, a pair of leg portions 38 d are formed in a rib shape on the back surface 38 c (surface fixed to the base material 35) of the panel material 38, and the leg portions 38 d are in contact with the base material 35. The leg portions 38d are erected on both sides of a receiving member fixing screw 32 used for fixing the receiving member 10, and serve to receive a load when the receiving member fixing screw 32 is tightened. Yes. That is, when the receiving member fixing screw 32 is tightened, an excessive load is applied to the panel member 38 to prevent a dent phenomenon.

  As shown in FIG. 5 and the like, the receiving member 10 is a long material fixed to the flat surface of the panel member 38 described above. The receiving member 10 has a substantially U-shaped cross section including a support portion 11 fixed in contact with the panel member 38 and a protruding edge portion 14 formed to rise from both ends of the support portion 11 at a substantially right angle. This is an extruded shape made of aluminum. The support portion 11 is formed with a convex portion 12 so as to be fitted into the concave portion 38b of the panel material 38, and a screw hole 13 through which the receiving member fixing screw 32 is penetrated. The receiving member 10 can be fixed to the panel member 38 by being fitted into the recess 38 b and fixed with the receiving member fixing screw 32. Further, an arrowhead-shaped locking claw 15 is formed at the outer front end portion of the protruding edge portion 14, and by engaging this locking claw 15 with a locking claw 23 of a resonator body material 20 described later, The resonator body material 20 can be fitted and fixed to the receiving member 10 with one touch. At the base of the protruding edge 14, a step 16 is formed to receive the tip of the locking claw 23 of the resonator body material 20. The fitted and fixed resonator body 20 is fixed without rattling. It is formed so that.

  Further, a small hole 18 a and a large hole 18 b are formed on the base side further than the step portion 16. The small hole 18 a and the large hole 18 b are for forming the air port 18 of the Helmholtz resonator in the side portion of the receiving member 10. In the present embodiment, the left and right projecting edge portions 14 are provided with air holes 18 of different sizes, and specifically, one projecting edge portion 14 is continuously provided with small holes 18a at predetermined intervals, Large holes 18b that open larger than the small holes 18a are continuously provided in the other protruding edge portion 14 at a predetermined interval. As shown in FIG. 2, the small holes 18 a and the large holes 18 b are opened at positions that are not covered by the side surface portion 22 of the resonator body material 20 described later.

  Further, an L-shaped partition wall receiving piece 19 is formed on the inner side surface of the receiving member 10 so as to protrude substantially parallel to the protruding edge portion 14. The partition wall receiving piece 19 is used to divide the inside of the Helmholtz resonator by being in close contact with the partition wall piece 28 of the resonator body material 20 described later. The partition wall receiving piece 19 is provided over the entire length in the longitudinal direction of the receiving member 10.

  As shown in FIG. 5 and the like, the resonator main body material 20 is a long material fitted and fixed to the receiving member 10, and is set to the same length as the receiving member 10. The resonator main body 20 is an extruded aluminum member having a front face portion 21 and side face portions 22 formed substantially at right angles from both ends of the front face portion 21 and having a substantially U-shaped cross section. An arrowhead-shaped locking claw 23 is formed on the inner side of the end portion of the side surface portion 22 and can be engaged with the locking claw 15 of the receiving member 10. Further, a lid fixing screw hole 25 for fixing a small-sized lid 30 (to be described later) is provided on the base side of the locking claw 23. The lid fixing screw hole 25 is formed so as to protrude inward, and the tip of the locking claw 15 of the receiving member 10 comes into contact therewith. In this way, by bringing the tip of the locking claw 15 into contact with the lid fixing screw hole 25, the locking claw 15 is prevented from entering when fitted to the receiving member 10, and is securely fixed.

  Further, an L-shaped partition wall piece 28 is formed on the inner side surface of the resonator main body 20 so as to protrude substantially parallel to the side surface portion 22. The partition piece 28 is provided at a position corresponding to the partition receiving piece 19 of the receiving member 10 described above, and the inside of the Helmholtz resonator is divided by being in close contact with the partition receiving piece 19. Since the partition wall piece 28 is erected over the entire length in the longitudinal direction of the receiving member 10, as shown in FIG. 2 and the like, the interior of the Helmholtz resonator is divided into two sound absorbing chambers. In the present embodiment, since the partition wall piece 28 and the partition wall receiving piece 19 are arranged at positions shifted to the left and right, the inside of the Helmholtz resonator is asymmetrically separated, and the first is a relatively large internal space. It is divided into a sound absorption chamber S1 and a second sound absorption chamber S2 having a smaller volume than the first sound absorption chamber S1. In the present embodiment, the small hole 18a is opened on the first sound absorbing chamber S1 side and the large hole 18b is opened on the second sound absorbing chamber S2. However, the present invention is not limited to this. The size of the air port 18 may be changed as appropriate according to the frequency range in which sound absorption is desired.

  As shown in FIG. 5 and the like, the fore cover 30 is a plate-like aluminum member fixed to 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.

  In the sound absorbing structure as described above, as shown in FIGS. 2 to 4, the opening portions at both ends of the resonator body material 20 are covered with the small lid 30, and the receiving member is disposed at the longitudinal opening portion of the resonator body material 20. 10 is attached, a first sound absorbing chamber S1 and a second sound absorbing chamber S2 shielded from the outside are formed inside the box-shaped member formed of the resonator body member 20, the small lid 30 and the receiving member 10. Will be. However, the first sound absorbing chamber S1 and the second sound absorbing chamber S2 are not completely cut off from the outside, and the first sound absorbing chamber S1 and the second sound absorbing chamber S2 are formed through the air port 18 that opens to the side of the receiving member 10. It communicates with the outside.

  Specifically, as shown in FIG. 2, the resonator body material 20 is fixed to the flat surface of the panel material 38 via the receiving member 10, so that the tip of the side surface portion 22 of the resonator body material 20 is a panel. It is set so as not to contact the material 38. For this reason, a gap G is formed between the resonator body member 20 and the flat surface of the panel member 38. Since the small hole 18a and the large hole 18b are formed in the protruding edge portion 14 of the receiving member 10 so as to face the gap G, the first sound absorbing chamber S1 and the large sound hole S1 are formed using the small hole 18a and the large hole 18b. An air port 18 of a Helmholtz resonator that communicates the second sound absorbing chamber S2 with the outside is formed.

  Thus, according to the present embodiment, the Helmholtz resonator is configured by the first sound absorbing chamber S1 and the second sound absorbing chamber S2, the small hole 18a, and the large hole 18b, so that a predetermined sound absorbing effect can be obtained. It has become.

  In addition, since the resonator body material 20 according to the present embodiment has the partition piece 28 protruding from the back surface side of the front surface portion 21, appearance defects such as streaks may occur during extrusion. For example, since the thickness of the extruded shape of the front surface portion 21 changes due to the provision of the partition piece 28, the structure streak appears linearly in the extrusion direction due to the non-uniformity of the metal structure and alloy composition. May occur and may impair the design. In the present embodiment, in order to avoid such a problem, a decorative groove 27 is 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.

  In the present embodiment, the resonator body 20 is fixed to the receiving member 10 by engaging the locking claws 15 and 23 with each other. 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 connected to each other (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. 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 the wall or the like. It may be fixed to a flat surface.

  The procedure for attaching the fall prevention cord 33 is as follows. That is, first, as shown in FIG. 7A, the fixing portion 33 a at one end of the fall prevention rope 33 is fixed to the rope fixing hole 30 b of the fore cover 30 by the rope fixing screw 34. Thereafter, as shown in FIG. 7B, the fore edge lid 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. 7 (c), the resonator body material 20 is fitted and fixed to the receiving member 10, and the fixing portion 33 a at the other end of the fall prevention cable 33 is fixed to the panel material 38 by the cable fixing screw 34. To do. 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 17 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. Next, the resonator body 20 is fitted and fixed to the receiving member 10. Then, the lid fixing screw 31 inserted through the fixing hole 30a of the small lid 30 is screwed into the lid fixing screw hole 25 of the resonator body material 20, and the lid fixing screw inserted through the receiving member fixing hole 30c of the small lid 30 is provided. The screw 31 is screwed into the lid fixing screw hole 17 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 receiving member 10 fixed to the ceiling surface of the building housing 50, the resonator body material 20 fitted to the receiving member 10, and the resonator body material 20 And the resonator body material 20 has a substantially U-shaped cross section, and both ends of the resonator body material 20 are covered with the mouthpiece cover 30, and the resonator Since the Helmholtz resonator is formed by fitting the receiving member 10 into the longitudinal opening of the main body member 20 and the partition wall extending in the longitudinal direction is provided inside the Helmholtz resonator, the resonator main body member 20 is provided on the receiving member 10. Since the Helmholtz resonator can be easily manufactured by simply fitting the small lid 30 and attaching the small lid 30, the workability is good. Moreover, since the volume of the sound absorption chamber can be changed by providing the partition wall, sound absorption in various frequency ranges is possible without losing the sense of unity of the design. In addition, since the sound absorbing structure uses a Helmholtz resonator, no sound absorbing material such as glass wool is required, and the recyclability is excellent.
Further, since the partition wall asymmetrically separates the interior of the Helmholtz resonator, it is possible to absorb sound in different frequency ranges in the respective sound absorbing chambers.

  Further, since the air port 18 of the Helmholtz resonator is opened at the protruding edge portion 14 of the receiving member 10, the air port 18 can be provided at a position that is difficult to visually recognize from the outside, and the design is good.

  In addition, since the panel material 38 is fixed to the surface where the base material 35 is required, and the receiving member 10 is fixed to the flat surface of the panel material 38, the sound absorbing structure is attached even at a location not provided with the flat surface. Since the installation location of the sound absorbing structure is not selected, the range of use can be expanded. 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.

  Moreover, since the recessed part 38b was provided in the surface 38a of the said panel material 38, and the said receiving member 10 was fixed to the said recessed part 38b, the receiving member 10 can be easily attached by using the recessed part 38b as a guide.

  Further, since the leg portion 38d is provided on the back surface 38c of the panel material 38 and the leg portion 38d is brought into contact with the ceiling surface of the building housing 50, when the receiving member 10 is fixed to the panel material 38 with a fastener such as a screw. Further, the dent can be prevented by supporting the leg portion 38d. 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.

  Moreover, since the fall prevention means which connects the said receiving member 10 and the said resonator main body material 20 directly or indirectly is provided, fitting with the resonator main body material 20 and the receiving member 10 should come off by any chance. Even so, the resonator body material 20 can be prevented from falling.

  In addition, since the decorative groove 27 is provided on the surface of the resonator body material 20, even when a partition wall or the like is formed on the back surface of the resonator body material 20, even if an appearance defect such as a structure streak occurs, the makeup groove 27 makes it difficult to visually recognize external defects such as streaks, so that the design is not impaired.

  Moreover, since the receiving member 10, the resonator main body material 20, the small mouth lid 30, the panel material 38, and the like constituting the sound absorbing structure are all made of aluminum, they can be easily recycled.

  In the present embodiment, the receiving member 10 is fixed via the panel material 38. However, the present invention is not limited to this, and the receiving member 10 is fixed directly to the flat surface of the building housing 50 without using the panel material 38. May be. If it does in this way, when resonator body material 20 is attached, it can be made the appearance like a louver material. Thus, the sound absorbing structure according to the present embodiment can be constructed with the same feeling as a spandrel or louver, and the presence or absence of the panel material 38 can be selected in consideration of design.

  Further, by changing the volume ratio of the resonator body material 20 to change the volume, changing the position and shape of the partition wall, and changing the size of the air port 18, various sound ranges are absorbed. be able to.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. Note that the basic structure of the present embodiment is the same as that of the first embodiment, and therefore, differences from the first embodiment will be described while avoiding redundant descriptions.

  The peripheral material 36 according to the present embodiment is divided as shown in FIGS. 9 to 11, and a decorative cover 37 is connected and fixed. The decorative cover 37 is provided so as to cover the end of the resonator body material 20 below the resonator body material 20. If such a decorative cover 37 is provided, the design is improved.

  In the present embodiment, the panel member 38 is not used, and the receiving member 10 is formed so as to protrude on both sides, so that the receiving member 10 also serves as the panel member 38. That is, the receiving member 10 according to the present embodiment is an aluminum extruded profile that is fixed to the ceiling surface of the building housing 50 via the base material 35 as shown in FIGS. It is fixed to the lower part of 35 with a screw or the like. The receiving member 10 includes a support portion 11 that forms a flat surface, and a protruding edge portion 14 that rises from the support portion 11 at a substantially right angle.

  Both ends of the support portion 11 are formed so as to project in the width direction, and include a first projecting piece 11a projecting to one end side and a second projecting piece 11c projecting to the other end side. The end portion of the first overhanging piece 11a is provided with a fixed end portion 11b that is in contact with the base material 35 and fixed with a stopper, and the first overhanging piece 11a of the adjacent receiving member 10 of another material is provided. And the second overhanging piece 11c are engaged with each other. For this reason, a plurality of receiving members 10 are arranged in parallel, and the first overhanging piece 11a and the second overhanging piece 11c of the receiving members 10 that are adjacent to each other are engaged with each other. A flat surface to which the material 20 can be attached can be formed.

  Also in this receiving member 10, an arrowhead-like locking claw 15 is formed at the outer front end portion of the protruding edge portion 14, and this locking claw 15 is engaged with the locking claw 23 of the resonator body material 20. By combining, the resonator main body 20 can be fitted and fixed to the receiving member 10 with one touch. Further, a small hole 18a and a large hole 18b for forming an air port 18 of the Helmholtz resonator are formed at the base of the protruding edge portion 14. A partition wall receiving piece 19 for dividing the inside of the Helmholtz resonator by being in close contact with the partition wall piece 28 of the resonator body material 20 is formed on the inner side surface of the receiving member 10 over the entire length in the longitudinal direction of the receiving member 10. It is erected across.

  The resonator body member 20 has substantially the same configuration as that of the first embodiment, and a partition piece 28 is formed to protrude on the inner surface. In addition, as shown in FIG. 13, a decorative groove 27 is provided on the surface of the resonator body material 20 in order to make it difficult to visually recognize an appearance defect such as a structure streak.

  In the sound absorbing structure as described above, as shown in FIGS. 9 to 11, the opening portions at both ends of the resonator body material 20 are covered with the small lid 30, and the receiving member is disposed at the longitudinal opening portion of the resonator body material 20. 10 is attached, a first sound absorbing chamber S1 and a second sound absorbing chamber S2 shielded from the outside are formed inside the box-shaped member formed of the resonator body member 20, the small lid 30 and the receiving member 10. Will be. However, the first sound absorbing chamber S1 and the second sound absorbing chamber S2 are not completely cut off from the outside, and the first sound absorbing chamber S1 and the second sound absorbing chamber S2 are formed through the air port 18 that opens to the side of the receiving member 10. It communicates with the outside.

  Specifically, as shown in FIG. 9, the resonator main body material 20 is fixed to the flat surface of the receiving member 10, so that the tip of the side surface portion 22 of the resonator main body material 20 is a flat surface (first overhang). It is set not to contact the piece 11a and the second overhanging piece 11c). For this reason, a gap G is formed between the resonator body member 20 and the flat surface of the receiving member 10. Since the small hole 18a and the large hole 18b are formed in the side portion of the receiving member 10 so as to face the gap G, the first sound absorbing chamber S1 and the second sound absorbing chamber S1 are formed using the small hole 18a and the large hole 18b. An air port 18 of a Helmholtz resonator that communicates the sound absorption chamber S2 with the outside is formed.

  Thus, according to the present embodiment, the Helmholtz resonator is configured by the first sound absorbing chamber S1 and the second sound absorbing chamber S2, the small hole 18a, and the large hole 18b, and a predetermined sound absorbing effect can be obtained. .

In addition, as a fall prevention means which connects the receiving member 10 and the resonator main body material 20 directly or indirectly, as shown in FIG.14 and FIG.15, the structure similar to 1st Embodiment is applied. Can do.
In the second embodiment as described above, the same effect as that of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Receiving member 11 Support part 11a 1st overhanging piece 11b Fixed end part 11c 2nd overhanging piece 12 Convex part 13 Screw hole 14 Protruding edge 15 Locking claw 16 Step part 17 Screw hole 18 for fixing a lid 18 Air opening 18a Small hole 18b Large hole 19 Bulkhead receiving piece 20 Resonator body material 21 Front face portion 22 Side face portion 23 Locking claw 25 Lid hole 27 for fixing the lid 28 Separating piece 30 Small edge lid 30a Fixing hole 30b Cable fixing hole 30c Receiving member fixing hole 31 Lid Fixing screw 32 Receiving member fixing screw 33 Fall prevention rope (fall prevention means)
33a fixing part 34 rope fixing screw 35 base material 36 edge material 37 decorative cover 38 panel material 38a surface 38b recess 38c back surface 38d leg part 39 receiving material 40 hanger 50 building housing S1 first sound absorbing chamber S2 second sound absorbing chamber G gap

Claims (8)

A sound absorbing structure using a Helmholtz resonator,
A receiving member fixed to the building frame side;
A resonator body material fitted to the receiving member;
A small lid fixed to both ends of the resonator body material;
With
The resonator body material has a substantially U-shaped cross section, covers both end openings of the resonator body material with the small lid, and fits the receiving member into the longitudinal opening of the resonator body material to absorb sound. Forming a chamber, opening an air port in the sound absorption chamber to form a Helmholtz resonator,
A sound absorbing structure, wherein a partition wall extending in a longitudinal direction is provided inside the Helmholtz resonator.   The sound absorbing structure according to claim 1, wherein the partition wall asymmetrically separates the interior of the Helmholtz resonator.   The sound absorbing structure according to claim 1, wherein the air opening is opened at a side portion of the receiving member.   The sound absorbing structure according to claim 3, wherein a panel material is fixed to a building housing side, and the receiving member is fixed to a flat surface of the panel material.   The sound absorbing structure according to claim 4, wherein a concave portion is provided on a surface of the panel material, and the receiving member is fixed to the concave portion.   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 a building housing side.   The sound absorbing structure according to any one of claims 1 to 6, further comprising fall prevention means for directly or indirectly connecting the receiving member and the resonator body material.   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.

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