JP7066166B2 - Sound insulation structure - Google Patents

Description

Patent Law Article 30, Paragraph 2 Applicable October 4, 2017 Published at the 2nd Kansai Factory Equipment and Equipment Exhibition.

Application of Article 30, Paragraph 2 of the Patent Law October 31, 2017 Published at the Construction Machinery Exhibition / Building Experience Fair Future 2017.

The present invention relates to a sound insulating structure.

A sound insulation structure that is provided around a noise source to insulate unpleasant noise is known.
As shown in FIG. 11, the sound insulating structure 1 of Patent Document 1 includes four rectangular plate-shaped shielding members 2 and a frame 3 attached to the shielding member 2, and these shielding members 2 and the frame. As a whole, it has a square tubular shape. The inside of the sound insulation structure 1 of Patent Document 1 is partitioned by four shielding members 2 as an accommodation space for accommodating a noise source.

The frame 3 attached to the shielding member 2 in the sound insulating structure 1 of Patent Document 1 has four columns 4 attached to both ends in the width direction of the shielding member 2 and extending in the vertical direction, and the upper ends of the columns 4 to each other. It includes four beams 5 to be connected, a base plate 6 attached to the lower end of the column 4, and a connecting joint 7 attached to the upper end of the column 4. As a result, the shielding member 2 is supported by the skeleton 3.

Japanese Unexamined Patent Publication No. 2011-43586

By the way, for example, when a small generator is housed in a storage space and used as a noise source, the inner surface of the sound insulation structure 1 is contaminated by the exhaust gas discharged when the small generator is driven, and sound absorption occurs. The effect may be reduced. Therefore, after using the sound insulation structure 1, it is necessary to wipe off the dirty portions on the inner and outer surfaces of the sound insulation structure 1.

However, in the sound insulating structure 1 described in Patent Document 1, the frame 3 is attached to the peripheral edge of the shielding member 2, and a step is generated between the shielding member 2 and the frame 3, so that the sound insulating structure is a sound insulating structure. There is a problem that it is difficult to wipe off the dirt on the surface of No. 1, and in particular, it is difficult to wipe off the dirt on the boundary portion between the shielding member 2 and the frame 3.

In order to solve the above problems, the present invention is a sound insulation structure provided with a main body portion formed of a hollow plate-shaped sound absorbing panel, and the sound absorbing panel is formed with a hinge portion extending in the height direction. The main body portion is formed in a tubular shape extending in the height direction by closing the hinge portion, and partitions a storage space for accommodating a noise source inside, and the hinge portion is the plate thickness of the sound absorbing panel. It is characterized in that it is configured to be thin.

According to the above configuration, the main body portion formed of the sound absorbing panel is formed in a tubular shape for partitioning the accommodation space by closing the hinge portion extending in the height direction. The hinge portion is configured by reducing the thickness of the sound absorbing panel. That is, the sound absorbing panels for partitioning the accommodation space are connected by a hinge portion formed by reducing the plate thickness of the panel, and are formed in a tubular shape. Therefore, a connecting member for connecting the sound absorbing panels is not required. Even if dirt adheres to the surface of the sound insulation structure when the noise source is housed in the storage space and used, it is easy to wipe off the dirt.

In the above sound insulation structure, a sound absorbing material made of a porous material is further provided, and the sound absorbing panel has a plurality of cells and communicates with each other by opening to the accommodation space side to communicate the inside and outside of the cells. It is preferable that the sound absorbing material has holes and is provided on the accommodation space side of the sound absorbing panel.

In the above sound insulation structure, the hinge portion includes a first hinge portion and a second hinge portion, and the main body portion has a square plate-shaped first sound absorbing panel and a square plate-shaped second sound absorbing panel as the sound absorbing panel. A panel and two square plate-shaped third sound absorbing panels are provided, respectively. The first sound absorbing panel and the second sound absorbing panel are adjacent to each other via the first hinge portion, and the second sound absorbing panel and the second sound absorbing panel are adjacent to each other. The three sound absorbing panels are adjacent to each other via the second hinge portion, the width dimension of the third sound absorbing panel is shorter than the width dimension of the first sound absorbing panel and the width dimension of the second sound absorbing panel, and the main body portion is The first hinge portion is closed and the second hinge portion is opened to partition the accommodation space, and the first hinge portion is opened and the second hinge portion is closed to fold the non-folded portion. It is preferably used.

In the sound insulation structure, it is preferable that at least one of the first hinge portion and the second hinge portion is configured to be detachable.
In the sound insulation structure, the sound absorbing panel has a core layer in which a plurality of pillar-shaped cells extending in the thickness direction are arranged side by side in the height direction, and a pair of core layers joined to both surfaces in the thickness direction. A skin layer is provided, and the skin layer on the accommodation space side of the pair of the skin layers is provided with the communication holes, and both end faces in the height direction of the sound absorbing panel are sealed. preferable.

According to the present invention, a sound insulating structure that can easily wipe off dirt on the surface can be obtained.

(A) is a perspective view of a sound absorbing panel, (b) is a β-β line sectional view in (a), and (c) is a γ-γ line sectional view in (a). (A) is a perspective view of a sheet material constituting the core layer of the sound absorbing panel, (b) is a perspective view showing a state in which the sheet material is being folded, and (c) is a perspective view showing a state in which the sheet material is folded. .. (D) is a cross-sectional view showing a mode of forming a communication hole of a sound absorbing panel. Perspective view of the sound insulation structure. Top view of the usage pattern of the sound insulation structure. Top view of the non-use form of the sound insulation structure. Perspective view of the sound insulation structure. (A) to (d) are views for explaining the sealing method of the end portion of the sound absorbing panel. (A) to (c) are diagrams illustrating a method of molding a hinge portion of a sound absorbing panel. (A) is a diagram for explaining the first hinge portion and the second hinge portion, and (b) is a diagram for explaining the third hinge portion. The figure explaining the modification example of the opening of a sound insulation structure. Top view of a conventional sound insulation structure.

Hereinafter, embodiments of the sound insulation structure 50 of the present invention will be described. First, the hollow plate material 10 used as the sound absorbing panel of the sound insulating structure 50 will be described.
As shown in FIG. 1A, the hollow plate material 10 is joined to a core layer 20 in which a plurality of cells S are arranged side by side and both sides in the thickness direction of the core layer 20 (both upper and lower sides in FIG. 1A). It is composed of sheet-shaped skin layers 30 and 40. As shown in FIGS. 1 (b) and 1 (c), the core layer 20 is formed by folding a single thermoplastic resin sheet material formed into a predetermined shape. The core layer 20 is composed of an upper wall portion 21, a lower wall portion 22, and a side wall portion 23 that is erected between the upper wall portion 21 and the lower wall portion 22 and divides the cell S into a hexagonal column shape. There is. In FIG. 1A, only some cells S (first cell S1 and second cell S2) are designated with reference numerals.

As shown in FIGS. 1 (b) and 1 (c), the first cell S1 and the second cell S2 having different configurations are present in the cell S partitioned inside the core layer 20. As shown in FIG. 1 (b), in the first cell S1, an upper wall portion 21 having a two-layer structure is provided above the side wall portion 23. Each layer of the upper wall portion 21 of this two-layer structure is joined to each other. Further, in the first cell S1, a lower wall portion 22 having a one-layer structure is provided below the side wall portion 23. On the other hand, as shown in FIG. 1 (c), in the second cell S2, the upper wall portion 21 having a one-layer structure is provided above the side wall portion 23. Further, in the second cell S2, a lower wall portion 22 having a two-layer structure is provided below the side wall portion 23. Each layer of the lower wall portion 22 of this two-layer structure is joined to each other. Further, as shown in FIGS. 1 (b) and 1 (c), the space between the adjacent first cells S1 and the space between the adjacent second cells S2 are partitioned by the side wall portion 23 having a two-layer structure. Has been done.

As shown in FIG. 1A, the first cells S1 are arranged side by side so as to form a row along the X direction, and when viewed from above, two adjacent first cells S1 are hexagonal 1s. Sharing the side. Similarly, the second cells S2 are arranged side by side in a row along the X direction, and when viewed from above, two adjacent second cells S2 share one side of the hexagon. The columns of the first cell S1 and the columns of the second cell S2 are arranged alternately in the Y direction orthogonal to the X direction. The core layer 20 has a honeycomb structure as a whole due to the first cell S1 and the second cell S2.

As shown in FIGS. 1 (a) to 1 (c), a skin layer 30 which is a sheet material made of a thermoplastic resin is bonded to the upper surface of the core layer 20 configured as described above. Further, a skin layer 40, which is a sheet material made of a thermoplastic resin, is bonded to the lower surface of the core layer 20. In this embodiment, the upper portion of the side wall portion 23 in the core layer 20 is blocked by the upper wall portion 21 and the skin layer 30 of the core layer 20. That is, the upper wall portion 21 and the skin layer 30 constitute the upper closed wall 11 that partitions the cell S from above. Similarly, the lower portion of the side wall portion 23 in the core layer 20 is closed by the lower wall portion 22 and the skin layer 40 of the core layer 20. That is, the lower wall portion 22 and the skin layer 40 constitute the lower closed wall 12 that partitions the cell S from the lower side.

As shown in FIGS. 1 (b) and 1 (c), the upper closed wall 11 of the hollow plate material 10 is provided with a communication hole 15 for communicating the inside and outside of the cell S. Specifically, as shown in FIG. 1 (b), in the first cell S1, the communication hole 15 penetrates the skin layer 30 on the upper surface side and the upper wall portion 21 of the two-layer structure. Further, as shown in FIG. 1 (c), in the second cell S2, the communication hole 15 penetrates the skin layer 30 on the upper surface side and the upper wall portion 21 of the one-layer structure.

As shown in FIG. 1 (a), one communication hole 15 is provided for each cell S. In this embodiment, the communication hole 15 is located at the center of the hexagonal shape of each cell S when the hollow plate material 10 is viewed from above. As shown in FIGS. 1 (b) and 1 (c), the diameter of the opening of each communication hole 15 is set to be equal to or less than the length of one side of the hexagon when the cell S is viewed from above. Specifically, the diameter of the opening of each communication hole 15 is set to a fraction of the distance P1 between the centers of the cells S adjacent to each other in the X direction (for example, about 0.5 to 3.0 mm). ..

Next, a method for manufacturing the hollow plate material 10 will be described with reference to FIG.
As shown in FIG. 2A, the first sheet material 100 is formed by molding one sheet made of a thermoplastic resin into a predetermined shape. In the first sheet material 100, a strip-shaped flat surface region 110 and a bulging region 120 are alternately arranged in the longitudinal direction (X direction) of the first sheet material 100. In the bulging region 120, a first bulging portion 121 having a cross-sectional downward groove shape composed of an upper surface and a pair of side surfaces is formed over the entire extending direction (Y direction) of the bulging region 120. The angle between the upper surface and the side surface of the first bulging portion 121 is preferably 90 degrees, and as a result, the cross-sectional shape of the first bulging portion 121 becomes a downward U-shape. Further, the width of the first bulging portion 121 (the length in the lateral direction of the upper surface) is equal to the width of the plane region 110, and the bulging height of the first bulging portion 121 (the length in the lateral direction of the side surface). ) Is set to be twice as long.

Further, in the bulging region 120, a plurality of second bulging portions 122 having a trapezoidal shape obtained by dividing a regular hexagon into two with the longest diagonal line are orthogonal to the first bulging portion 121. It is formed. The bulging height of the second bulging portion 122 is set to be equal to the bulging height of the first bulging portion 121. Further, the distance between the adjacent second bulging portions 122 is equal to the width of the upper surface of the second bulging portion 122.

The first bulging portion 121 and the second bulging portion 122 are formed by partially bulging the sheet upward by utilizing the plasticity of the sheet. Further, the first sheet material 100 can be molded from one sheet by a well-known molding method such as a vacuum forming method or a compression molding method.

As shown in FIGS. 2A and 2B, the core layer 20 is formed by folding the first sheet material 100 configured as described above along the boundary lines P and Q. Specifically, the first sheet material 100 is valley-folded at the boundary line P between the flat surface region 110 and the bulging region 120, and the mountain is folded at the boundary line Q between the upper surface and the side surface of the first bulging portion 121. Fold it and compress it in the X direction. Then, as shown in FIGS. 2 (b) and 2 (c), the upper surface and the side surface of the first bulging portion 121 are folded, and the end surface of the second bulging portion 122 and the plane region 110 are folded. , A prismatic compartment 130 extending in one Y direction with respect to one bulging region 120 is formed. The hollow plate-shaped core layer 20 is formed by continuously forming the compartments 130 in the X direction. In this embodiment, the direction in which the first sheet material 100 is compressed for folding is the direction in which the cells S are arranged side by side (X direction).

When the first sheet material 100 is compressed as described above, the upper wall portion 21 of the core layer 20 is formed by the upper surface and the side surface of the first bulging portion 121, and the end surface and the flat surface of the second bulging portion 122 are formed. The lower wall portion 22 of the core layer 20 is formed by the region 110. As shown in FIG. 2C, a portion of the upper wall portion 21 in which the upper surface and the side surface of the first bulging portion 121 are folded to form a two-layer structure, and a second bulging portion in the lower wall portion 22. The portions where the end faces of 122 and the plane region 110 are folded to form a two-layer structure are the overlapping portions 131, respectively.

Further, the hexagonal column-shaped region formed by folding the second bulging portion 122 to form a partition becomes the second cell S2, and the hexagonal column-shaped region formed by partitioning between a pair of adjacent compartments 130 is the second cell. It becomes 1 cell S1. In the present embodiment, the upper surface and the side surface of the second bulging portion 122 form the side wall portion 23 of the second cell S2, and the side surface of the second bulging portion 122 and the second bulging portion 122 in the bulging region 120. The flat surface portion located between them constitutes the side wall portion 23 of the first cell S1. Then, the contact portion between the upper surfaces of the second bulge portion 122 and the contact portion between the plane portions in the bulge region 120 form a side wall portion 23 having a two-layer structure. Further, in the first cell S1, the upper portion thereof is partitioned by a pair of superposition portions 131, and in the second cell S2, the lower portion thereof is partitioned by a pair of superposition portions 131. When carrying out such a folding step, it is preferable that the first sheet material 100 is heat-treated to be in a softened state.

A second sheet material made of a thermoplastic resin is bonded to the upper surface and the lower surface of the core layer 20 thus obtained by heat welding, respectively. The second sheet material joined to the upper surface of the core layer 20 becomes the skin layer 30, and together with the upper wall portion 21 of the core layer 20, constitutes an upper blocking wall 11 that closes the cell S from above. The second sheet material joined to the lower surface of the core layer 20 becomes the skin layer 40, and constitutes the lower closing wall 12 that closes the cell S from the lower side together with the lower wall portion 22 of the core layer 20.

When the second sheet material (skin layers 30 and 40) is heat-welded to the core layer 20, the upper wall portion 21 (superimposed portion 131) of the two-layer structure in the first cell S1 is heat-welded to each other. .. Similarly, the lower wall portion 22 (superimposed portion 131) of the two-layer structure in the second cell S2 is heat-welded to each other.

By each of the above steps, a large number of first cell S1 or second cell S2 are arranged side by side so as to form a row in the X direction, and a large number of first cell S1 and second cell S2 are alternately arranged side by side in the Y direction. The plate material 10 is obtained.

After that, a large number of communication holes 15 are formed in the upper wall portion 21 (upper closed wall 11) of the skin layer 30 and the core layer 20 of the hollow plate material 10. The communication hole 15 is formed by penetrating a penetrating jig T such as a drill, a needle, or a punch through the upper wall portion 21 of the skin layer 30 and the core layer 20 of the hollow plate material 10. As shown in FIG. 2D, the penetrating jig T has a configuration in which a plurality of penetrating jigs T are arranged at substantially the same intervals as the intervals between the centers of adjacent cells S. The hollow plate material 10 is arranged and fixed on the lower side of the plurality of penetrating jigs T, and the penetrating jig T is moved downward. In this way, in the skin layer 30 of the hollow plate material 10 and the upper wall portion 21 of the core layer 20, one communication hole 15 is formed in each substantially central portion of each cell S. Through the above steps, the hollow plate material 10 in which the plurality of communication holes 15 are formed is manufactured. The hollow plate material 10 of the present embodiment has a plate thickness of about 20 mm.

Next, the configuration of the sound insulation structure 50 using the above hollow plate material 10 as the sound absorbing panel will be described.
As shown in FIG. 3, the sound insulation structure 50 of the present embodiment has a main body portion 60 having a rectangular tubular shape when viewed from above by bending a hollow plate material 10 as a sound absorbing panel, and an inner surface surface of the main body portion 60. It is provided with the joined sound absorbing materials 71 and 72. The inside of the sound insulation structure 50 is partitioned by the main body 60 and the sound absorbing materials 71 and 72 into a storage space C for accommodating a noise source (for example, a generator, a motor, etc.).

As shown in FIG. 3, the main body 60 includes a square plate-shaped first sound absorbing panel 61, a square plate-shaped second sound absorbing panel 62, and a square plate-shaped third sound absorbing panel 63 as sound absorbing panels. .. The first sound absorbing panel 61 is provided at two positions facing each other when the sound insulating structure 50 has a rectangular tubular shape when viewed from above. The second sound absorbing panel 62 is provided at two positions facing each other at a position symmetrical with respect to the center point in the top view of the sound insulating structure 50 when the sound insulating structure 50 has a rectangular tubular shape in the top view. Has been done. Similarly, the third sound absorbing panel 63 faces the sound insulating structure 50 at a position symmetrical with respect to the center point in the top view of the sound insulating structure 50 when the sound insulating structure 50 has a rectangular tubular shape in the top view. It is provided in a place.

As shown in FIGS. 3 to 5, the first sound absorbing panel 61 and the second sound absorbing panel 62 are adjacent to each other via the first hinge portion 81. In the first hinge portion 81, the thermoplastic resin constituting the core layer 20 and the skin layers 30 and 40 is thermally deformed by thermally melting the hollow plate material 10 constituting the sound absorbing panel, and the plate thickness thereof is the other portion. It is formed thinner. As a result, the first hinge portion 81 has a shape recessed in a substantially right-angled triangular shape when viewed from above, and the portion where the thickness of the hollow plate material 10 constituting the sound absorbing panel is the thinnest can be opened and closed as the rotation shaft 81a. It is configured. The first sound absorbing panel 61 and the second sound absorbing panel 62 rotate around the rotation shaft 81a of the first hinge portion 81, and the first hinge portion 81 is closed (the state shown in FIGS. 3 and 4). It can take any position between the open state and the open state (the state shown in FIG. 5).

As shown in FIGS. 3 and 6, in the sound insulation structure 50 of the present embodiment, one of the first hinge portions 81 of the two locations is the first hinge portion 81 (the front side of FIGS. 3 and 6). The shape is divided into two along the rotation shaft 81a, and the opening 51 of the sound insulation structure 50 is formed. Therefore, as shown in FIG. 6, the noise source can be accommodated in the accommodation space C through the opening 51, and the noise source can be taken out from the accommodation space C.

As shown in FIGS. 3 to 5, the second sound absorbing panel 62 and the third sound absorbing panel 63 are adjacent to each other via the second hinge portion 82. The second hinge portion 82 is formed by thermally deforming the thermoplastic resin constituting the core layer 20 and the skin layers 30 and 40 by thermally melting the hollow plate material 10 constituting the sound absorbing panel, and the plate thickness thereof is increased. It is formed thinner than other parts. As a result, the second hinge portion 82 has a shape recessed in a substantially right-angled triangular shape when viewed from above, and the portion where the thickness of the hollow plate material 10 constituting the sound absorbing panel is the thinnest can be opened and closed as the rotation shaft 82a. It is configured. The second sound absorbing panel 62 and the third sound absorbing panel 63 rotate around the rotation shaft 82a of the second hinge portion 82, and the second hinge portion 82 is closed (state shown in FIG. 5) and opened. It can take any position between the states (states shown in FIGS. 3 and 4).

As shown in FIG. 3, the third sound absorbing panel 63 and the first sound absorbing panel 61 are adjacent to each other via the third hinge portion 83. The third hinge portion 83 is formed by thermally melting and thermally deforming the hollow plate material 10 constituting the sound absorbing panel, and then heat-welding the thermoplastic resin constituting the core layer 20 and the skin layers 30 and 40. , The third sound absorbing panel 63 and the first sound absorbing panel 61 are joined and fixed so as to be substantially orthogonal to each other. In this respect, the third hinge portion 83 does not have a hinge structure, but in the molding process described later, it is formed into a substantially right-angled triangular shape in the upper surface view similar to the first hinge portion 81 and the second hinge portion 82. After that, it is joined and fixed by heat welding. In other words, in the third sound absorbing panel 63 and the first sound absorbing panel 61, the third hinge portion 83 is rotated around the rotation shaft 83a in the molding process described later, and the third hinge portion 83 is closed. In this state, they are joined and fixed to each other by heat welding. In the present embodiment, the hinge structure (third hinge portion 83) joined by heat welding and the hinge structure having a divided shape (first hinge portion 81 forming the opening 51) are included in the molding step. A portion formed by rotatably joining adjacent sound absorbing panels 61, 62, 63 to each other is referred to as a hinge portion.

As shown in FIG. 9A, the first hinge portion 81 and the second hinge portion 82 have the same shape. In the first hinge portion 81 and the second hinge portion 82, the portions where the thickness of the hollow plate material 10 is the thinnest are the flat flat portions 81b and 82b. The width of the flat surface portions 81b and 82b is preferably, for example, 2 to 5 mm, and is about 3 mm in the present embodiment. Therefore, in reality, the first hinge portion 81 and the second hinge portion 82 rotate with arbitrary positions on the flat surface portions 81b and 82b as rotation shafts 81a and 82a.

On the other hand, as shown in FIG. 9B, in the third hinge portion 83 before heat welding, a flat flat portion 83b is formed in the portion where the thickness of the hollow plate material 10 is the thinnest, and the width thereof is wide. Is narrower than the flat surface portions 81b and 82b of the first hinge portion 81 and the second hinge portion 82, and is about 1 mm in the present embodiment.

The first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63 are oriented orthogonal to the direction in which the rows of the first cell S1 and the second cell S2 extend inside the sound absorbing panels 61, 62, 63. (Y direction in FIGS. 1 and 2) is arranged so as to be in the height direction of the sound insulation structure 50. Further, the sound absorbing panels 61, 62, and 63 are arranged so that the side where the communication hole 15 is provided (that is, the skin layer 30 side) faces the accommodation space C side.

As shown in FIGS. 3 and 6, a notch 52 is formed at the lower end of the widthwise end of one of the first sound absorbing panel 61 and the sound absorbing material 71. The cutout portion 52 has a triangular shape cut off at the lower end portion of one of the first sound absorbing panel 61 and the sound absorbing material 71. The notch 52 is not formed at the lower ends of the other first sound absorbing panel 61 and the sound absorbing material 71.

As shown in FIG. 3, strip-shaped sealing portions 61a are provided on the upper end surface and the lower end surface of the first sound absorbing panel 61, respectively. The width direction dimension of the sealing portion 61a is the same as the thickness dimension of the first sound absorbing panel 61, and the length direction dimension of the sealing portion 61a is the same as the width direction dimension of the first sound absorbing panel 61. ing. The sealing portion 61a has the same shape as the upper end surface and the lower end surface of the first sound absorbing panel 61. The sealing portion 61a prevents the internal space (cell S) of the first sound absorbing panel 61 from being exposed on the upper end surface and the lower end surface of the first sound absorbing panel 61, and the upper end surface of the first sound absorbing panel 61. And the lower end surface is reinforced.

Further, a strip-shaped sealing portion 52a is provided at the end edge of the cutout portion 52 in the first sound absorbing panel 61. By providing the sealing portion 52a, the internal space (cell S) of the first sound absorbing panel 61 is not exposed in the cutout portion 52 of the first sound absorbing panel 61. Therefore, it is difficult for water and dust to enter the core layer 20 of the hollow plate material 10 from the edge of the notch 52. Further, the edge of the notch 52 is reinforced by the sealing portion 52a.

Similarly, strip-shaped sealing portions 62a are provided on the upper end surface and the lower end surface of the second sound absorbing panel 62, respectively. Further, a strip-shaped sealing portion 63a is provided on each of the upper end surface and the lower end surface of the third sound absorbing panel 63. The sealing portion 62a has the same shape as the upper end surface and the lower end surface of the second sound absorbing panel 62, and the sealing portion 63a has the same shape as the upper end surface and the lower end surface of the third sound absorbing panel 63. These sealing portions 62a and 63a prevent the internal space (cell S) from being exposed on the upper end surface and the lower end surface of the second sound absorbing panel 62 and the third sound absorbing panel 63, and the second sound absorbing portion. The upper end surface and the lower end surface of the panel 62 and the third sound absorbing panel 63 are reinforced.

As shown in FIGS. 4 and 5, the widthwise dimension L1 of the first sound absorbing panel 61 is longer than the widthwise dimension L2 of the second sound absorbing panel 62, and the widthwise dimension L2 of the second sound absorbing panel 62 is It is longer than the dimension L3 in the width direction of the third sound absorbing panel 63. Above all, the dimension L3 in the width direction of the third sound absorbing panel 63 is determined in relation to the thickness dimension of the sound absorbing materials 71 and 72, which will be described later. Specifically, the dimension L3 in the width direction of the third sound absorbing panel 63 is the thickness of the hollow plate material 10 constituting the first sound absorbing panel 61 and the plate thickness of the hollow plate material 10 constituting the second sound absorbing panel 62. The thickness is substantially the same as or slightly larger than the thickness obtained by adding the thickness of the sound absorbing material 71 and the thickness of the sound absorbing material 72, which will be described later. In other words, the dimension L3 in the width direction of the third sound absorbing panel 63 is substantially the same as or slightly larger than the thickness obtained by adding the thicknesses of the sound absorbing material 71 and the sound absorbing material 72 to the value twice the plate thickness of the hollow plate material 10. There is.

As shown in FIGS. 3 and 4, handle members 92 are attached to the surfaces of the two first sound absorbing panels 61 opposite to the accommodation space C, respectively. The handle member 92 has a band shape extending in the width direction of the first sound absorbing panel 61, and both ends thereof are fixed to the first sound absorbing panel 61 by rivets (studs) (not shown). The handle member 92 is located at the center of the first sound absorbing panel in the width direction and above the center in the height direction.

As shown in FIGS. 3 and 6, two female hook-and-loop fasteners 91a are attached to the surface of the second sound absorbing panel 62 on the side where the opening 51 is formed, which is opposite to the accommodation space C. The female hook-and-loop fastener 91a is arranged closer to the opening 51 side in the second sound absorbing panel 62. Further, two female hook-and-loop fasteners 91a are arranged one above the other with the center of the second sound absorbing panel 62 in the height direction interposed therebetween in the width direction of the second sound absorbing panel 62.

Further, two male hook-and-loop fasteners 91 are attached to the surface of the first sound absorbing panel 61 on the side where the opening 51 is formed, which is opposite to the accommodation space C. The male hook-and-loop fastener 91 has a strip shape extending in the width direction of the first sound absorbing panel 61, and one end in the longitudinal direction thereof is fixed to the first sound absorbing panel 61. As shown in FIG. 6, the other end of the male hook-and-loop fastener 91 in the longitudinal direction protrudes to the outside in the width direction of the first sound absorbing panel 61.

As shown in FIGS. 3 to 6, a quadrangular plate-shaped sound absorbing material 71 is attached to the accommodation space C side of the first sound absorbing panel 61. In this embodiment, the sound absorbing material 71 is detachably attached to the surface of the first sound absorbing panel 61 on the accommodation space C side by a hook-and-loop fastener (not shown). The dimension in the height direction of the sound absorbing material 71 is slightly shorter than the dimension in the height direction of the surface of the first sound absorbing panel 61 on the accommodation space C side, and the lower end of the sound absorbing material 71 is the lower end of the first sound absorbing panel 61. It is installed at a slightly higher position. By doing so, when the sound insulating structure is used, the lower end of the sound absorbing material 71 does not touch the ground and becomes less likely to get dirty. Further, the dimension in the width direction of the sound absorbing material 71 is substantially the same as or slightly shorter than the dimension in the width direction of the surface of the first sound absorbing panel 61 on the accommodation space C side.

A quadrangular plate-shaped sound absorbing material 72 is attached to the accommodation space C side of the second sound absorbing panel 62. In this embodiment, the sound absorbing material 72 is detachably attached to the surface of the second sound absorbing panel 62 on the accommodation space C side by a hook-and-loop fastener (not shown). The height dimension of the sound absorbing material 72 is slightly shorter than the height dimension of the surface of the second sound absorbing panel 62 on the accommodation space C side, and the lower end of the sound absorbing material 72 is the lower end of the second sound absorbing panel 62. It is installed at a slightly higher position. By doing so, when the sound insulating structure is used, dirt on the lower end of the sound absorbing material 72 is suppressed.

Further, the dimension in the width direction of the sound absorbing material 72 is shorter than the dimension in the width direction of the surface of the second sound absorbing panel 62 on the accommodation space C side. Specifically, the dimension in the width direction of the sound absorbing material 72 is shorter than the dimension in the width direction of the surface of the second sound absorbing panel 62 on the accommodation space C side by the thickness of the sound absorbing material 71. The sound absorbing material 72 is attached to the edge of the third sound absorbing panel 63 side at the same position as the edge of the surface of the second sound absorbing panel 62 on the accommodation space C side on the third sound absorbing panel 63 side. At the end edge on the 1 sound absorbing panel 61 side, the edge on the side of the accommodation space C side of the second sound absorbing panel 62 is displaced toward the third sound absorbing panel 63 by the thickness of the sound absorbing material 71 from the edge on the first sound absorbing panel 61 side. It is installed in the position.

No sound absorbing material is attached to the accommodation space C side of the third sound absorbing panel 63.
The sound absorbing materials 71 and 72 of the present embodiment are glass wool formed by adhering glass fibers while compressing them. Glass wool is a porous material with innumerable gaps between glass fibers.

Next, a usage mode of the sound insulation structure 50 configured as described above will be described.
When using the sound insulation structure 50, first, as shown in FIG. 6, the two second hinge portions 82 are opened so that the second sound absorbing panel 62 and the third sound absorbing panel 63 are linear in the upper view. The first hinge portion 81 on the opposite side of the opening 51 is slightly opened to separate the first sound absorbing panel 61 and the second sound absorbing panel 62 on the opening 51 side. At this time, the opening 51 is opened. In this state, the noise source is moved to the opening 51 side of the sound insulation structure 50, or the opening 51 of the sound insulation structure 50 is moved to the noise source side, and the noise source is moved from the opening 51 into the accommodation space C. Contain. When the sound insulating structure 50 is moved, the sound insulating structure 50 can be easily moved by having the handle member 92 attached to the surface of the first sound absorbing panel 61 opposite to the accommodation space C.

Subsequently, the first sound absorbing panel 61 and the second sound absorbing panel 62 on the opening 51 side are brought close to each other to close the opening 51. At this time, the first hinge portion 81 between the first sound absorbing panel 61 and the second sound absorbing panel 62 on the opposite side of the opening 51 is in a closed state. As a result, as shown in FIG. 3, the sound insulation structure 50 has a cylindrical shape as a whole, and the noise source is accommodated in the accommodation space C which is the internal space thereof.

When the sound insulating structure 50 is used, the male hook-and-loop fastener 91 attached to the surface of the first sound absorbing panel 61 opposite to the accommodation space C is placed on the side opposite to the accommodation space C of the second sound absorbing panel 62. It is fixed to two female hook-and-loop fasteners 91a attached to the surface. As a result, the opening 51 cannot be opened, and the rectangular tubular shape of the sound insulating structure 50 is maintained.

In the sound insulation structure 50 used, as shown in FIG. 3, the notch 52 of the first sound absorbing panel 61 on the opening 51 side communicates with each other inside and outside the accommodation space C. Therefore, the cables can be pulled out from the noise source housed inside the sound insulation structure 50 to the outside through the notch 52.

When noise is emitted from the noise source while the noise source is housed inside the sound insulation structure 50, the noise in the relatively high frequency range of the noise from the noise source is the noise of the sound absorbing materials 71 and 72. Propagating the air in the gap, the vibration of the air is consumed as heat energy due to the friction and viscous resistance of the air. On the other hand, among the noise from the noise source, the noise in the middle frequency range is absorbed by the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63. Specifically, noise (vibration of air) is guided to the inside of the cell S through the communication holes 15 in the sound absorbing panels 61, 62, 63. Then, the air vibrates violently in the vicinity of the communication hole 15 that communicates the inside and outside of the cell S, and the air rubs against the peripheral portion of the communication hole 15, so that the vibration of the air is consumed as heat energy. By absorbing noise by such different principles, the sound insulation structure 50 absorbs noise in a relatively wide frequency range.

By the way, in general, when the noise source is surrounded by the sound insulation structure 50 as described above, when the sound insulation structure 50 reflects the noise, the noise reverberates in the accommodation space C of the sound insulation structure 50, and the sound insulation structure Noise may be loud even outside the body 50 depending on the location. In this respect, in the sound insulating structure 50 of the above embodiment, since the sound absorbing materials 71, 72 and the sound absorbing panels 61, 62, 63 absorb noise, the reverberation in the accommodation space C can be suppressed and the propagated sound can be reduced.

Next, the non-use form of the sound insulation structure 50 will be described.
When the sound insulation structure 50 configured as described above is not used, it can be in an unused form as shown in FIG. First, the male hook-and-loop fastener 91 fixed to the female hook-and-loop fastener 91a is removed, and the opening 51 is opened as shown in FIG. Subsequently, the noise source is moved from the opening 51 side of the sound insulation structure 50, or the sound insulation structure 50 is moved from the noise source side, and the noise source is moved to the outside of the accommodation space C of the sound insulation structure 50. When the sound insulating structure 50 is moved, the sound insulating structure 50 can be easily moved by having the handle member 92 attached to the surface of the first sound absorbing panel 61 opposite to the accommodation space C.

By driving the noise source, dirt may adhere to the surface of the sound insulation structure 50 on the accommodation space C side. In addition, dirt may adhere to the surface opposite to the accommodation space C. Therefore, the dirt on the inner and outer surfaces on the accommodation space C side is wiped off. At this time, the dirt on the surface of the sound absorbing materials 71 and 72 is wiped off, and if necessary, the sound absorbing materials 71 and 72 are removed to wipe off the dirt on the surface of each of the sound absorbing materials 61, 62 and 63.

Then, the male hook-and-loop fastener 91 is fixed to the female hook-and-loop fastener 91a again.
As shown in FIG. 5, in this state, the first sound absorbing panel 61 and the second sound absorbing panel 62 are rotated around the rotation shaft 81a of the first hinge portion 81, and the second sound absorbing panel 62 and the third sound absorbing panel 62 are rotated. The panel 63 is rotated around the rotation shaft 82a of the second hinge portion 82. As a result, the first hinge portion 81 (including the first hinge portion 81 forming the opening 51) is opened, and the first sound absorbing panel 61 and the second sound absorbing panel 62 are linear in the upper view. Further, the second hinge portion 82 is closed, and the third sound absorbing panel 63 is in a state orthogonal to the first sound absorbing panel 61 and the second sound absorbing panel 62 in the top view.

At this time, the dimension L3 in the width direction of the third sound absorbing panel 63 is substantially the same as the thickness obtained by adding the thicknesses of the sound absorbing material 71 and the sound absorbing material 72 to the value twice the plate thickness of the hollow plate material 10. Therefore, the surfaces of the sound absorbing materials 71 and 72 on the accommodation space C side are arranged at positions close to each other with almost no gap. As shown in FIG. 5, the sound insulation structure 50 is a folded non-use form.

Next, a method of manufacturing the sound insulation structure 50 will be described. The method for manufacturing the sound insulating structure 50 is a step of forming the main body 60, and a step of attaching the male hook-and-loop fastener 91, the female hook-and-loop fastener 91a, and the handle member 92 to the surface of the main body 60 opposite to the accommodation space C. A step of attaching the sound absorbing materials 71 and 72 to the sound absorbing panels 61 and 62 of the main body 60 is provided.

First, the process of molding the main body portion 60 will be described. The step of molding the main body 60 is, as shown in FIGS. 7 (a) to 7 (d), the step of molding the sealing portions 61a, 62a, 63a, 52a of the main body 60, as shown in FIG. 8 (a). In the process of forming the first hinge portion 81 and the second hinge portion 82 of the main body portion 60, as shown in FIGS. 8 (b) and 8 (c), the third hinge portion 83 of the main body portion 60 is formed. It has a process of heat welding. The hollow plate material 10 shown in FIG. 7 is a state in which the sound absorbing panel constituting the sound insulating structure 50 is viewed from the side, and the hollow plate material 10 shown in FIG. 8 is a state in which the sound absorbing panel constituting the sound insulating structure 50 is viewed from above. It is a state. That is, in FIG. 7, the left-right direction of the paper surface corresponds to the height direction of the sound insulation structure 50, and in FIG. 8, the left-right direction of the paper surface corresponds to the width direction of the sound insulation structure 50.

First, a hollow plate material 10 having a predetermined size is prepared prior to molding the sealing portions 61a, 62a, 63a, 52a of the main body portion 60. The size of the hollow plate material 10 is slightly larger than the overall size of the unfolded shape of the main body portion 60. Specifically, in the height direction of the main body 60, the height of the main body 60 is increased by approximately two plate thicknesses of the hollow plate material 10, and in the width direction of the main body 60, the main body is increased. Prepare a size that is substantially the same as the overall width dimension of the developed shape of 60.

As shown in FIGS. 7 (a) and 7 (b), in the step of forming the sealing portions 61a, 62a, 63a, 52a of the main body 60, the heating jig 210 is provided above and the pressure jig below. A processing device 200 provided with 220 is used. The heating jig 210 is provided with a heating blade 210a whose thickness M1 is slightly larger than the plate thickness of the hollow plate material 10 while extending over the entire length in the width direction of the hollow plate material 10. Further, the pressurizing jig 220 is provided with a pressurizing portion 220a whose height H1 is slightly larger than the thickness M1 of the heating blade 210a while extending over the entire length of the hollow plate material 10 in the width direction.

As shown in FIG. 7A, the hollow plate material 10 is set on the processing apparatus 200. At this time, the hollow plate material 10 is set so that the portion corresponding to the upper end edge of the sound insulating structure 50 in the height direction is located below the heating jig 210. That is, the edge in the direction orthogonal to the extending direction of the rows of the first cell S1 and the second cell S2 (Y direction in FIGS. 1 and 2) is set so as to be located below the heating jig 210. Further, the hollow plate material 10 is set so that the skin layer 30 side provided with the communication holes 15 faces upward and the edge of the hollow plate material 10 is aligned with the edge of the heating jig 210.

As shown in FIG. 7A, in this state, the heating jig 210 is moved downward toward the hollow plate material 10. The heating jig 210 is heated to a temperature at which the thermoplastic resin constituting the hollow plate material 10 is thermally melted. Therefore, the end portion of the hollow plate material 10 is thermally melted and compressed by heating and pressurizing by the heating jig 210 over the entire length in the width direction. Since the skin layer 30 provided with the communication holes 15 faces upward in the hollow plate material 10, the hexagonal columnar cell S formed in the core layer 20 is compressed in the height direction. At this time, the upper wall portion 21, the lower wall portion 22, and the side wall portion 23 of the core layer 20 constituting the hollow plate material 10 and the skin layers 30 and 40 are thermally melted and integrated.

As shown in FIG. 7 (b), after the heating jig 210 is moved upward from the hollow plate material 10, the pressure jig 220 is the end portion (back surface portion) where the hollow plate material 10 is compressed and thinned. It is moved upward from the skin layer 40 side toward. At this time, the end portion of the hollow plate material 10 is in a state of being heat-softened by heating with the heating jig 210. Therefore, as shown in FIG. 7 (c), the end portion of the thinned hollow plate material 10 is pushed by the pressure jig 220, bent, and joined to the hollow plate material 10. At the end where the hollow plate material 10 is thinned, the hollow plate material 10 is compressed in the height direction of the cell S, and the thermoplastic resins constituting the core layer 20, the skin layers 30, and 40 are thermally melted and integrated. The end face of the hollow plate material 10 is sealed by joining a portion where the thermoplastic resin is thermally melted and integrated. Further, at the bent and joined ends, the skin layer 40 side of the hollow plate material 10 is located on the outside. That is, the side on which the communication hole 15 is not formed is located on the outside. Therefore, it is possible to prevent water and dust from entering the core layer 20 of the hollow plate material 10.

As shown in FIG. 7 (c), since the thickness M1 of the heating blade 210a of the heating jig 210 is slightly larger than the plate thickness of the hollow plate material 10, the portion thinned to seal the end face of the hollow plate material 10 is hollow. The plate material 10 is bent and joined in a shape protruding in the thickness direction. Therefore, as shown in FIG. 7D, the portion of the hollow plate material 10 protruding in the thickness direction is cut by a cutting jig (not shown) and molded so that the edge of the hollow plate material 10 on the skin layer 30 side becomes smooth. do.

Subsequently, the portion corresponding to the lower end edge of the sound insulation structure 50 in the height direction is also formed in the same manner, and the end face of the hollow plate material 10 is sealed. In this way, the hollow plate material 10 is formed with the sealing portions 61a, 62a, 63a, 52a of the main body portion 60, and the upper end surface and the lower end surface of the sound insulating structure 50 and the edge of the notch portion 52 are sealed. Be stopped.

Next, a step of forming the first hinge portion 81 and the second hinge portion 82 of the main body portion 60 and a step of forming the third hinge portion 83 of the main body portion 60 and heat welding will be described.
As shown in FIGS. 8A and 8B, in the step of forming the first hinge portion 81 and the second hinge portion 82 of the main body portion 60, a mounting table 300 extending in the horizontal direction and a mounting table 300 provided above the mounting table 300 are provided. A processing device having heating jigs 310 and 320 is used. The heating jig 310 and the heating jig 320 are configured to be vertically movable separately.

The heating jig 310 includes a heating blade 310a having a tip shape corresponding to the first hinge portion 81 and the second hinge portion 82 while extending over the entire length in the direction corresponding to the height direction of the sound insulating structure 50. ing. Further, the heating jig 320 is provided with a heating blade 320a having a tip shape corresponding to the third hinge portion 83 while extending over the entire length in the direction corresponding to the height direction of the sound insulating structure 50.

As shown in FIG. 8A, the heating blade 310a of the heating jig 310 has a substantially right-angled triangular cross-section that tapers toward the tip, and a flat portion 310b that is flat in the horizontal direction is formed at the tip. There is. The flat portion 310b has a width of about 3 mm. Further, as shown in FIG. 8B, the heating blade 320a of the heating jig 320 has a substantially right-angled triangular cross section that tapers toward the tip, and a flat portion 320b that becomes flat in the horizontal direction is formed at the tip. Has been done. The flat portion 320b has a width of about 1 mm.

First, the hollow plate material 10 on which the sealing portions 61a, 62a, and 63a are formed is set on the mounting table 300. At this time, the positions corresponding to the first hinge portion 81 and the second hinge portion 82 of the sound insulating structure 50 are located below the heating blade 310a of the heating jig 310, respectively, and the positions corresponding to the third hinge portion 83 are heated. Set it so that it is located below the heating blade 320a of the jig 320. Further, the hollow plate material 10 is set so that the skin layer 30 side provided with the communication holes 15 faces upward.

As shown in FIG. 8A, in this state, the heating jig 310 is moved downward toward the hollow plate material 10. The heating blade 310a of the heating jig 310 is heated to a temperature at which the thermoplastic resin constituting the hollow plate material 10 is thermally melted. Therefore, the hollow plate material 10 is thermally melted and compressed by heating and pressurizing by the heating blade 310a of the heating jig 310 over the entire length in the height direction. As a result, the first hinge portion 81 and the second hinge portion 82 having the same shape as the heating blade 310a are formed. In FIG. 8A, only one of the five heating jigs 310 is numbered.

Since the heating blade 310a has a substantially right-angled triangular cross section, the formed first hinge portion 81 and the second hinge portion 82 have the thinnest hollow plate material 10 as shown in FIG. 9A. The thickness gradually decreases toward the flat flat portions 81b and 82b. Since the hollow plate material 10 has the skin layer 30 side provided with the communication holes 15 facing upward, the hexagonal columnar cell S formed in the core layer 20 tends toward the flat surface portions 81b and 82b. It will be gradually compressed in the height direction. Further, the upper wall portion 21, the lower wall portion 22, and the side wall portion 23 of the core layer 20 constituting the hollow plate material 10 and the skin layers 30 and 40 are thermally melted and integrated. Therefore, in the flat surface portions 81b and 82b, the core layer 20 and the skin layers 30 and 40 integrated by heat melting are in the most compressed state, and the density of the thermoplastic resin constituting the hollow plate material 10 is high. It's getting higher. Therefore, the strength is the strongest as compared with other parts. Further, since the hollow plate material 10 is most compressed and the thickness of the hollow plate material 10 is thin, it is the easiest to bend.

Further, since the flat portion 310b of the heating blade 310a is set to about 3 mm, the widths of the flat portions 81b and 82b of the first hinge portion 81 and the second hinge portion 82 are about 3 mm. Therefore, the first hinge portion 81 and the second hinge portion 82 can rotate at arbitrary positions on the flat surface portions 81b and 82b as the rotation shafts 81a and 82a. In the first hinge portion 81 and the second hinge portion 82, the rotation shafts 81a and 82a are configured, and the flat surface portions 81b and 82b having the strongest strength have a width of 3 mm, so that the hinge structure has a hinge structure. The rigidity is high.

As shown in FIG. 8B, after the heating jig 310 is moved upward from the hollow plate material 10, the heating jig 320 is moved downward toward the hollow plate material 10. The heating blade 320a of the heating jig 320 is heated to a temperature at which the thermoplastic resin constituting the hollow plate material 10 is thermally melted. Therefore, the hollow plate material 10 is thermally melted and compressed by heating and pressurizing by the heating blade 320a of the heating jig 320 over the entire length in the height direction. As a result, the third hinge portion 83 having the same shape as the heating blade 320a is formed. In FIG. 8B, only one of the two heating jigs 320 is numbered.

Since the heating blade 320a has a substantially right-angled triangular cross section, the formed third hinge portion 83 is a flat flat surface having the thinnest thickness of the hollow plate material 10 as shown in FIG. 9B. The shape is such that the thickness gradually decreases toward the portion 83b. Since the hollow plate material 10 has the skin layer 30 side provided with the communication holes 15 facing upward, the hexagonal columnar cell S formed in the core layer 20 gradually increases toward the flat surface portion 83b. It will be compressed in the height direction. Further, the upper wall portion 21, the lower wall portion 22, and the side wall portion 23 of the core layer 20 constituting the hollow plate material 10 and the skin layers 30 and 40 are thermally melted and integrated. Therefore, in the flat surface portion 83b, the core layer 20 and the skin layers 30 and 40 that are thermally melted and integrated are in the most compressed state, and have the highest strength. Further, since the flat portion 320b of the heating blade 320a is set to about 1 mm, the width of the flat portion 83b of the third hinge portion 83 is about 1 mm.

As shown in FIG. 8C, after the heating jig 320 is moved upward from the hollow plate material 10, the first sound absorbing panel 61 and the third sound absorbing panel 63 are rotated by the third hinge portion 83. It is supported by using the support member 400. At this time, in the third hinge portion 83, the thermoplastic resin is in a state of being thermally softened by heating with the heating jig 320. Therefore, in the third hinge portion 83, the first sound absorbing panel 61 and the third sound absorbing panel 63 are heat-welded and joined. At this time, since the width of the flat surface portion 83b in the third hinge portion 83 is about 1 mm, the first sound absorbing panel 61 and the third sound absorbing panel 63 are firmly joined without a gap.

Next, the male hook-and-loop fastener 91, the female hook-and-loop fastener 91a, and the handle member 92 are attached to the surface of the main body 60 opposite to the accommodation space C. Further, the hook-and-loop fastener is fixed at a predetermined position on the surface of the main body 60 on the side of the accommodation space C, the hook-and-loop fastener is fixed to the sound absorbing materials 71 and 72, and the sound absorbing materials 71 and 72 are attached to the sound absorbing panels 61 and 62.

Through the above steps, the sound insulation structure 50 is obtained.
According to the above embodiment, the following effects are obtained.
(1) In the sound insulation structure 50 of the above embodiment, the first sound absorbing panel 61 and the second sound absorbing panel 62 are connected to each other by the first hinge portion 81 having a thinned hollow plate material 10, and the first hinge is connected to each other. It can be rotated by opening and closing the portion 81. Further, the second sound absorbing panel 62 and the third sound absorbing panel 63 are connected to each other by a second hinge portion 82 having a thinned hollow plate material 10, and can be rotated by opening and closing the second hinge portion 82. It is said that. As a result, it is not necessary to separately attach a connecting member for connecting the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63, and the inner surface of each sound absorbing panel 61, 62, 63 is a connecting portion thereof. It has a smooth shape including (hinge portions 81 and 82). Therefore, even if dirt adheres to the inner surface of the sound insulating structure 50 when the noise source is accommodated and used in the accommodation space, the dirt can be easily wiped off.

(2) In the sound insulating structure 50 of the above embodiment, the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63 are formed of a hollow plate material 10 having a smooth surface. Further, the first hinge portion 81 and the second hinge portion 82 are smooth on their outer surfaces. Therefore, although the outer surface of each of the sound absorbing panels 61, 62, 63 is attached with the male hook-and-loop fastener 91, the female hook-and-loop fastener 91a, and the handle member 92, the other parts have a smooth shape. Even if dirt adheres to the outer surface of the sound insulation structure 50, it is easy to wipe off the dirt.

(3) In the sound insulating structure 50 of the above embodiment, the sound absorbing materials 71 and 72 are attached to the surfaces of the first sound absorbing panel 61 and the second sound absorbing panel 62 on the accommodation space C side with a hook-and-loop fastener, if necessary. The sound absorbing materials 71 and 72 can be removed. Therefore, it is easy to remove the sound absorbing materials 71 and 72 and wipe the surfaces of the first sound absorbing panel 61 and the second sound absorbing panel 62 on the accommodation space C side.

(4) In the sound insulation structure 50 of the above embodiment, since it is not necessary to separately attach a connecting member for connecting the first sound absorption panel 61, the second sound absorption panel 62, and the third sound absorption panel 63, the sound insulation structure 50 is used. The number of constituent members can be reduced.

(5) When another member is attached to a sound insulating structure such as a connecting member for connecting the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63, a noise source is provided in the accommodation space C. When housed and used, another member may vibrate due to vibration from the noise source, and chattering noise may occur. In the sound insulation structure 50 of the above embodiment, since the connecting member is not attached, the generation of such chattering sound is suppressed.

(6) In the sound insulation structure 50 of the above embodiment, the first hinge portion 81 and the second hinge portion 82 are formed by thermally melting the hollow plate material 10 to form the core layer 20 and the skin layers 30 and 40. The thickness of the hollow plate material 10 is reduced in a state where the thermoplastic resin is integrated. Therefore, the first hinge portion 81 and the second hinge portion 82 are easy to bend.

(7) In the sound insulation structure 50 of the above embodiment, the first hinge portion 81 and the second hinge portion 82 have flat surface portions 81b and 82b having a width of about 3 mm. That is, there is a width in the portions of the first hinge portion 81 and the second hinge portion 82 that are the rotation shafts 81a and 82a. Therefore, the repulsiveness of the first hinge portion 81 and the second hinge portion 82 is reduced, and the bending resistance is increased.

(8) When the noise source is accommodated in the accommodation space C and used, the sound insulation structure 50 of the above embodiment is used by closing the first hinge portion 81 and opening the second hinge portion 82. When the noise source is not accommodated, the non-use form can be obtained by opening the first hinge portion 81 and closing the second hinge portion 82. Therefore, it is possible to save space when storing or transporting the sound insulation structure 50.

(9) In the sound insulation structure 50 of the above embodiment, the dimension L3 in the width direction of the third sound absorbing panel 63 constitutes the plate thickness of the hollow plate material 10 constituting the first sound absorbing panel 61 and the second sound absorbing panel 62. The thickness of the hollow plate material 10 is substantially the same as or slightly larger than the thickness obtained by adding the thickness of the sound absorbing material 71 and the thickness of the sound absorbing material 72. In other words, the thickness is almost the same as or slightly larger than the thickness obtained by adding the thicknesses of the sound absorbing material 71 and the sound absorbing material 72 to the value twice the plate thickness of the hollow plate material 10. Therefore, by opening the first hinge portion 81 and closing the second hinge portion 82, the first sound absorbing panel 61 and the second sound absorbing panel 62 become linear in the upper view, and the third sound absorbing panel 63 is the first sound absorbing panel 61. In the non-used form in which the sound absorbing panel 62 is orthogonal to the second sound absorbing panel 62 in the top view, the surfaces of the sound absorbing materials 71 and 72 on the accommodation space C side are arranged at positions close to each other with almost no gap. Therefore, it is possible to save space when storing or transporting the sound insulation structure 50.

(10) In the sound insulation structure 50 of the above embodiment, of the two first hinge portions 81, one of the first hinge portions 81 has a shape divided into two along the rotation shaft 81a. The opening 51 of the sound insulation structure 50 is formed. Therefore, the noise source can be accommodated in the accommodation space C through the opening 51, and the noise source can be taken out from the accommodation space C.

(11) In the sound insulation structure 50 of the above embodiment, the two female hook-and-loop fasteners 91a attached to the surface opposite to the accommodation space C in the second sound absorption panel 62 are connected to the accommodation space C in the first sound absorption panel 61. The male hook-and-loop fastener 91 attached to the surface opposite to the above is fixed. Therefore, it is easy to close the opening 51 with the female hook-and-loop fastener 91a and the male hook-and-loop fastener 91.

(12) In the sound insulation structure 50 of the above embodiment, a plurality of cells S are arranged side by side in the first sound absorption panel 61, the second sound absorption panel 62, and the third sound absorption panel 63, and open to the accommodation space C side. The communication hole 15 is formed. Further, sound absorbing materials 71 and 72 are attached to the surfaces of the first sound absorbing panel 61 and the second sound absorbing panel 62 on the accommodation space C side. Therefore, the noise from the noise source in the accommodation space C of the main body 60 is attenuated not only in the sound absorbing materials 71 and 72 but also in the cells S of the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63. And be absorbed. Here, in the sound absorbing materials 71 and 72 made of a porous material, the air propagates in the gaps between the sound absorbing materials 71 and 72, and the vibration of the air is used as heat energy due to the friction and viscous resistance of the air. Sound is absorbed by being consumed. On the other hand, in the first sound absorbing panel 61, the second sound absorbing panel 62, and the third sound absorbing panel 63 having the plurality of cells S, the air violently vibrates in the vicinity of the communication hole 15 that communicates the inside and outside of the cell S, and the air concerned. Frictions with the peripheral portion of the communication hole 15 causes the vibration of air to be consumed as heat energy. That is, the sound absorbing materials 71, 72 and the sound absorbing panels 61, 62, 63 absorb noise by different principles. By using sound absorption based on different principles in combination, the sound insulation structure 50 of the above embodiment is expected to have a sound absorption effect in a wide frequency range as compared with the case where sound absorption is performed only by the sound absorption materials 71 and 72. can.

(13) In the sound insulating structure 50 of the above embodiment, since the sound absorbing materials 71 and 72 can be removed as needed, the sound absorbing material 71 is used when the sound insulating structure 50 is folded and transported in an unused form. , 72 can be removed to make it lighter, or the old sound absorbing materials 71, 72 can be replaced with new ones.

(14) In the sound insulation structure 50 of the above embodiment, glass wool is used as the sound absorbing materials 71 and 72. Since glass wool is a flame-retardant material made of glass fiber, the sound insulation structure 50 can be used even in a site where flammable fuel or electricity is handled, such as in a factory or a construction site.

(15) In the sound insulating structure 50 of the above embodiment, the hollow plate material 10 having a honeycomb structure is adopted as the sound absorbing panels 61, 62, 63. As a result, the sound absorbing panels 61, 62, 63 are lightweight, and the bending rigidity of the sound absorbing panels 61, 62, 63 is correspondingly high. Therefore, for example, it is possible to prevent the sound absorbing panels 61, 62, 63 from bending due to their own weight while the sound absorbing panels 61, 62, 63 are being used as the sound insulating structure 50.

(16) As shown in FIGS. 2A to 2D, in the hollow plate material 10, the side wall portion 23 of the core layer 20 extends in the Y direction. Therefore, even if water infiltrates into the cell S of the core layer 20, it is unlikely that the water penetrates the side wall portion 23 and spreads in the X direction. On the other hand, in the hollow plate material 10, the side wall portions 23 of the two layers of the core layer 20 are overlapped in the X direction, and the side wall portions 23 of these two layers are not always completely joined. Therefore, if water infiltrates into the cell S of the core layer 20, the water may spread in the Y direction from the gap between the side wall portions 23 of the two layers.

In the sound insulation structure 50 of the above embodiment, the sound absorbing panels 61, 62, 63 are vertically oriented in the direction orthogonal to the direction in which the rows of the first cell S1 and the second cell S2 extend (the Y direction in FIGS. 1 and 2). It is arranged so as to be in the direction. That is, in each of the sound absorbing panels 61, 62, 63, water is more likely to spread in the vertical direction than in the width direction. Therefore, in the sound insulation structure 50 of the above embodiment, sealing portions 61a, 62a, 63a are provided on the upper end surfaces and the lower end surfaces of the sound absorbing panels 61, 62, 63. Therefore, it is possible to prevent water from entering the inside of the cell S from the upper side or the lower side of each sound absorbing panel.

(17) In the sound insulation structure 50 of the above embodiment, the sealing portion 61a of the first sound absorbing panel 61 has the same shape as the upper end surface and the lower end surface of the first sound absorbing panel 61. Further, the sealing portion 62a of the second sound absorbing panel 62 has the same shape as the upper end surface and the lower end surface of the second sound absorbing panel 62, and the sealing portion 63a of the third sound absorbing panel 63 has the same shape as the third sound absorbing panel 63. It has the same shape as the upper end surface and the lower end surface of. Further, the edge of the notch 52 is also sealed by the sealing portion 52a. Therefore, due to these sealing portions 61a, 62a, 63a, 52a, at the upper end surface and the lower end surface of the first sound absorbing panel 61, the second sound absorbing panel 62 and the third sound absorbing panel 63, and at the edge of the notch 52, they are The internal space (cell S) is not exposed. The intrusion of water and dust into the inside of each panel 61, 62, 63 is suppressed.

(18) In the sealing portions 61a, 62a, 63a of the sound insulating structure 50 of the above embodiment, the upper wall portion 21, the lower wall portion 22, the side wall portion 23, and the skin layer 30 of the core layer 20 constituting the hollow plate material 10 , 40 are thermally melted and integrated. Therefore, the sealing portions 61a, 62a, 63a have high rigidity, and the end faces of the sound absorbing panels 61, 62, 63 are reinforced by the sealing portions 61a, 62a, 63a.

(19) In the sound insulation structure 50 of the above embodiment, cables extending from the noise source in the accommodation space C can be pulled out to the outside of the sound insulation structure 50 through the notch 52 of the first sound absorption panel 61. .. Therefore, it is unlikely that cables will be sandwiched between the ground and the sound insulation structure 50, and the sound insulation structure 50 will rattle and be placed.

(20) In the above embodiment, one of the first hinge portions 81 has a shape divided into two along the rotation shaft 81a, and constitutes an opening 51 of the sound insulation structure 50. Therefore, the noise source can be accommodated in the accommodation space C through the opening 51, and the noise source can be taken out from the accommodation space C. The usability of the sound insulation structure 50 is improved.

(21) In the above embodiment, the handle member 92 is provided on the first sound absorbing panel 61. Therefore, when the sound insulation structure 50 is folded or carried, it is easy to grip and easy to handle.

The above embodiment can be changed as follows. The following modification examples may be applied in combination as appropriate.
The sound insulation structure 50 of the above embodiment has a cylindrical shape having a rectangular shape when viewed from above, but may have a triangular shape when viewed from above and a polygonal shape having a pentagonal shape or more when viewed from above. In this case, the sound insulation structure 50 does not necessarily have to be in an unused form. That is, when the sound absorbing panels 61, 62, 63 are folded, the surfaces of the sound absorbing materials 71, 72 on the accommodation space C side do not have to be arranged at positions close to each other with almost no gap.

-The sound absorbing panels 61, 62, 63 of the above embodiment have a square shape, but are not limited to this. For example, it may be trapezoidal.
In the sound insulation structure 50 of the above embodiment, one of the first hinge portions 81 is detachable along the rotation shaft 81a, and the opening 51 is formed at the position of the rotation shaft 81a. , Not limited to this. The first hinge portion 81 may not be detachable and the opening 51 may not be formed. Further, the opening 51 may be formed by forming one of the second hinge portions 82 into a shape so as to be detachable. Further, at least one of the two first hinge portions 81 and the two second hinge portions 82 may be formed in a shape that is separably divided so that the opening 51 is formed.

The portion forming the opening 51 is divided along the rotation axis 81a of the first hinge portion 81 having a substantially right-angled triangular shape when viewed from above, but the shape of the portion where the opening 51 is formed is Not limited to this. For example, as shown in the enlarged portion of the top view of FIG. 10, the edge of the first sound absorbing panel 61 on the opening 51 side and the edge of the second sound absorbing panel 62 on the opening 51 side are both rectangular in top view. There may be. In this case, the sound absorbing materials 71 and 72, the male hook-and-loop fastener 91, and the female hook-and-loop fastener 91a may be appropriately attached to positions where the sound insulating structure 50 can be used and not used.

In the first hinge portion 81 and the second hinge portion 82, the thermoplastic resin constituting the core layer 20 and the skin layers 30 and 40 is thermally melted and integrated by the heating blade 310a of the heated heating jig 310. It is molded by. The molding method of the first hinge portion 81 and the second hinge portion 82 is not limited to this, and may be formed by cutting out, for example, a substantially right-angled triangular cross section with a cutting jig.

As shown in FIG. 8A, in the sound insulation structure 50 of the present embodiment, the first hinge portion 81 constituting the opening 51 is replaced with the other first hinge portions 81 and the second hinge portion 81 not forming the opening 51. Similar to the hinge portion 82, it was formed by the heating blade 310a of the heating jig 310. The present invention is not limited to this, and for example, as shown in FIG. 7 as a series of steps, the molding may be performed by the heating jig 210 and the pressure jig 220. In this case, the heating blade 210a of the heating jig 210 may have a shape that matches the shape of the first hinge portion 81 constituting the opening 51 and the sealing portion that seals the first hinge portion 81. Further, the shape of the pressure jig 220 may be such that the pressure is applied to a shape that matches the first hinge portion 81.

The third hinge portion 83 has a rotating shaft 83a after the thermoplastic resins constituting the core layer 20 and the skin layers 30 and 40 are thermally melted and integrated by the heating blade 320a of the heated heating jig 320. It is molded by closing around and being heat welded. The molding method of the third hinge portion 83 is not limited to this, and for example, after cutting into a substantially right-angled triangular cross section with a cutting tool, the cut portion is heated to heat-melt the thermoplastic resin and heat-weld. It may be molded by.

The first hinge portion 81, the second hinge portion 82, and the third hinge portion 83 have a substantially right-angled triangular shape when viewed from above, but the present invention is not limited to this. For example, it may have a square shape when viewed from above, or it may have a W-shape when viewed from above. The sound absorbing panels 61, 62, 63 may be rotatable around the rotating shafts 81a, 82a, 83a, and the accommodation space C may be formed by the sound absorbing panels 61, 62, 63.

In the sound insulation structure 50 of the above embodiment, the portion of the third hinge portion 83 is heat-welded and cannot be opened or closed. The present invention is not limited to this, and the portion of the third hinge portion 83 may be heat-welded and may have a hinge structure that can be opened and closed. In this case, it is preferable that the third hinge portion 83 has a flat surface portion 83b formed by about 3 mm, similarly to the first hinge portion 81 and the second hinge portion 82.

The materials of the core layer 20 and the skin layers 30 and 40 are not limited, and examples thereof include thermoplastic resins such as polypropylene and vinyl chloride, paper, and metals. Further, for example, a functional resin or an additive may be added, such as adding a flame-retardant resin or an additive to the thermoplastic resin.

The core layer 20 is not limited to the one obtained by folding the first sheet material 100 to form the core layer 20, but the core layer may be formed by using a plurality of sheet materials. For example, a strip-shaped sheet material may be bent at predetermined intervals, and a plurality of these sheet materials may be arranged side by side to form a core layer. In the case of this modification, the bent portion of each sheet material constitutes the side wall portion of the cell.

The skin layers 30 and 40 are not limited to being bonded to the core layer 20 by heat welding, and the skin layers 30 and 40 may be bonded to the core layer 20 by, for example, using an adhesive or the like. Further, even if an adhesive layer made of, for example, a thermoplastic resin is interposed between the core layer 20 and the skin layers 30 and 40, and the skin layers 30 and 40 are bonded to the core layer 20 by the adhesive force of the adhesive layer. good.

A sheet material may be joined between the hollow plate material 10 and the sound absorbing materials 71 and 72 on the accommodation space C side of the skin layer 30 in the hollow plate material 10 (sound absorbing panel). For example, a moisture permeable waterproof sheet that allows gas permeation and suppresses water permeation may be bonded to the outer surface of the skin layer 30 on the side where the communication hole 15 is provided. The moisture-permeable waterproof sheet can be attached to the hollow plate material 10 with, for example, a hook-and-loop fastener, double-sided tape, or an adhesive. The moisture-permeable waterproof sheet is preferably provided with innumerable fine holes penetrating in the thickness direction, and the pore diameter of the fine holes is 100 μm, which is the size of water particles (water droplets such as rain and fog). It is preferably sufficiently small compared to about 2000 μm and sufficiently large compared to several nm or less, which is the size of a gas molecule, for example, about 0.3 to 1.0 μm. By doing so, it is possible to suppress the change in the sound absorbing characteristics of the sound absorbing panels 61, 62, 63 due to the intrusion of water into the cell S through the communication hole 15. In addition, the moisture permeable waterproof sheet allows the permeation of gas.

Further, a sheet material other than the moisture permeable waterproof sheet such as a resin sheet or a soundproof sheet may be interposed, but in that case, the sheet material transmits the frequency absorbed by the sound absorbing panels 61, 62, 63. It is preferably the material and thickness.

Another sheet material may be bonded to the outer surface of the skin layer 40 in the hollow plate material 10 (sound absorbing panels 61, 62, 63). The sheet material may be, for example, a metal sheet (metal foil), a steel plate, paper, cloth, or the like. Further, the skin layer 40 itself may be made of a metal sheet (metal foil), paper, cloth or the like.

The shape of the cell S in the hollow plate material 10 (sound absorbing panels 61, 62, 63) is not limited to the hexagonal column shape. For example, the shape of the cell S may be a quadrangular prism shape or a cylindrical shape. Further, cells S having different shapes may be mixed. Further, in the hollow plate material 10, not only when adjacent cells S are in contact with each other, there may be a gap between two adjacent cells S. When there is a gap between the cell S and the cell S, not only the communication hole 15 that communicates the inside and outside of the cell S but also the communication hole that communicates the inside and outside of the space between the cell S and the cell S is provided. It may be provided.

In the hollow plate material 10, a plurality of communication holes 15 may be provided for one cell S. Further, the communication hole 15 may not be provided corresponding to all cells S, or may be provided corresponding to some cells S.

The dimensions of the sound absorbing panels 61, 62, 63 (hollow plate material 10), the volume of the cell S, and the like may be appropriately changed according to the size and sound absorbing performance required for the sound insulating structure 50. For example, in the sound insulation structure 50 of the present embodiment, the thickness of the sound absorbing panel is not limited to about 20 mm, but is preferably 15 to 50 mm, more preferably 20 to 30 mm. The volume of the cell S is preferably 0.6 to 3.0 cubic centimeters, particularly preferably 1.0 to 2.5 cubic centimeters. In the case of the volume of such a cell S, when the thickness of the sound absorbing panel is 20 mm, the peak of the sound absorbing frequency is about 800 Hz, and when the thickness of the sound absorbing panel is 30 mm, the peak of the sound absorbing frequency is about 630 Hz.

A notch 52 is provided at the lower end of the first sound absorbing panel 61, but the position of the notch 52 is not particularly limited. It may be the lower end of the second sound absorbing panel 62, the lower end of the third sound absorbing panel 63, or may be provided at a position straddling the lower ends of the plurality of sound absorbing panels 61, 62, 63. .. Further, the sound absorbing panels 61, 62, 63 may be provided at an intermediate position in the height direction and an upper end portion instead of the lower end portion. The notch 52 can also be omitted.

The sound insulation structure 50 may include a square plate-shaped lid member that covers the upper opening. The square plate-shaped lid member is preferably composed of a sound absorbing panel made of the hollow plate material 10.

-The materials of the sound absorbing materials 71 and 72 are not limited to glass wool. The sound absorbing materials 71 and 72 may be a non-woven fabric obtained by adhering fibers made of synthetic resin while compressing them. Further, the material is not limited to the material composed of fibers, and may be a porous synthetic resin material having a plurality of holes inside, such as a urethane mat (urethane foam foam).

The thicknesses of the sound absorbing materials 71 and 72 can be appropriately changed, but are preferably 10 to 100 mm, more preferably about 20 to 50 mm. If the thicknesses of the sound absorbing materials 71 and 72 and the thicknesses of the sound absorbing panels 61, 62 and 63 are set to be about the same, it becomes easy to obtain a high sound absorbing coefficient in a wide frequency range while making the overall thickness relatively small. ..

In the sound insulation structure 50 of the present embodiment, one band-shaped handle member 92 is attached to the surface of the first sound absorbing panel 61 opposite to the accommodation space C side, but the position and number of the handle members 92 are different. It can be changed as appropriate. Further, the handle member 92 may be omitted.

-Other configurations may be adopted in place of the male hook-and-loop fastener 91 and the female hook-and-loop fastener 91a provided in the opening 51. For example, instead of the above-mentioned hook-and-loop fasteners, a plurality of strings may be attached to the first sound absorbing panel 61 and the second sound absorbing panel 62 sandwiching the opening 51. In the case of this modification, for example, by connecting the string extending from the first sound absorbing panel 61 and the string extending from the second sound absorbing panel 62, both are held in a connected state. Further, the male hook-and-loop fastener 91 and the female hook-and-loop fastener 91a may be omitted.

The mounting mode of the sound absorbing materials 71 and 72 to the sound absorbing panels 61 and 62 is not limited to the hook-and-loop fastener. For example, the sound absorbing materials 71 and 72 may be attached to the sound absorbing panels 61 and 62 with rivets (rivets). In the case of this modification, the sound absorbing materials 71 and 72 cannot be removed from the sound absorbing panels 61 and 62 or are difficult to remove, but if the sound absorbing materials 71 and 72 are made of a material such as glass wool that does not easily deteriorate over time, In terms of sound absorption performance, problems are unlikely to occur. Further, if the sound absorbing materials 71 and 72 and the sound absorbing panels 61 and 62 are attached in such a manner that dirt does not easily adhere to them, no problem will occur when wiping off the dirt after use.

The sound absorbing panels 61, 62, and 63 are not arranged so that the direction orthogonal to the direction in which the rows of the first cell S1 and the second cell S2 extend (the Y direction in FIGS. 1 and 2) is the vertical direction. May be good. For example, the sound absorbing panels 61, 62, 63 may be arranged so that the direction orthogonal to the extending direction of the rows of the first cell S1 and the second cell S2 is the width direction. In this case, it is preferable that both end faces of the sound absorbing panels 61, 62, 63 in the width direction are sealed by the sealing portions 61a, 62a, 63a.

The sealing portions 61a, 62a, 63a, and 52a are integrally formed with the hollow plate material 10 by thermally melting and compressing the end portions of the hollow plate material 10. Not limited to this, the sealing portions 61a, 62a, 63a, 52a may be provided as a member separate from the hollow plate material 10. For example, a flat plate-shaped member made of a thermoplastic resin may be heat-welded as sealing portions 61a, 62a, 63a, 52a.

The upper end surfaces and lower end surfaces of the sound absorbing panels 61, 62, 63 may not be sealed by the sealing portions 61a, 62a, 63a. Further, the edge of the notch 52 may not be sealed by the sealing portion 52a. If it is assumed that the sound insulating structure 50 is not exposed to rain or the like and the sound insulating structure 50 is not exposed to water, the sealing portions 61a, 62a, 63a, 52a are omitted. There is no harmful effect. Further, instead of the sealing portions 61a, 62a, 63a, 52a, the upper end surface and the lower end surface of the sound absorbing panels 61, 62, 63 and the edge of the notch portion 52 are sealed with a sealing member of a member different from the hollow plate material 10. You may stop.

In the sound insulation structure 50 of the above embodiment, the first hinge portion 81 and the second hinge portion 82 are formed to be recessed from the accommodation space C side of the sound insulation structure 50, but the present invention is not limited to this. For example, the shape may be recessed from the opposite side of the accommodation space C side of the sound insulation structure 50.

The sound insulation structure 50 of the above embodiment is formed by molding one hollow plate material 10, but is not limited to this, and the end faces of a plurality of hollow plate materials 10 are heat-welded to be integrated. It may be formed with. In this case, for example, a transparent or translucent hollow plate material 10 and a colored opaque hollow plate material 10 can be formed by heat welding and integrating them. In this way, the inside of the sound insulating structure 50 can be visually recognized through the transparent or translucent hollow plate material 10.

S ... cell, S1 ... first cell, S2 ... second cell, C ... accommodation space, L1 ... width dimension, L2 ... width dimension, L3 ... width dimension, 10 ... hollow plate material, 11 ... upper closed wall, 12 ... lower Closing wall, 15 ... communication hole, 20 ... core layer, 21 ... upper wall part, 22 ... lower wall part, 23 ... side wall part, 30 ... skin layer, 40 ... skin layer, 50 ... sound insulation structure, 51 ... opening , 52 ... notch, 60 ... main body, 61 ... first sound absorbing panel, 61a ... sealing part, 62 ... second sound absorbing panel, 62a ... sealing part, 63 ... third sound absorbing panel, 63a ... sealing part, 71 ... Sound absorbing material, 72 ... Sound absorbing material, 81 ... First hinge part, 82 ... Second hinge part, 83 ... Third hinge part, 100 ... First sheet material, 110 ... Flat area, 120 ... Swelling area, 121 ... 1st bulging part, 122 ... 2nd bulging part, 130 ... compartment, 131 ... overlapping part.

Claims (2)

A sound insulation structure having a main body formed of a hollow plate-shaped sound absorbing panel and a sound absorbing material formed of a porous material .
The sound absorbing panel is formed with a hinge portion extending in the height direction.
The main body portion is formed in a tubular shape extending in the height direction by closing the hinge portion, and partitions a storage space for accommodating a noise source inside.
The hinge portion is formed on the surface of the sound absorbing panel on the accommodation space side as a concave groove having a triangular cross section, so that the thickness of the sound absorbing panel is reduced .
The sound absorbing panel has a plurality of cells and has a communication hole that opens to the accommodation space side to allow communication between the inside and outside of the cell.
The sound absorbing material is provided on the accommodation space side of the sound absorbing panel.
The dimension in the height direction of the sound absorbing material is shorter than the dimension in the height direction of the sound absorbing panel, and in a state where the main body portion is formed in a tubular shape, the lower end of the sound absorbing material is from the lower end of the sound absorbing panel. It is installed so that it is in a high position,
The sound absorbing panel comprises a core layer in which a plurality of pillar-shaped cells extending in the thickness direction are arranged side by side in the height direction, and a pair of skin layers joined to both surfaces of the core layer in the thickness direction.
A sound insulation structure characterized in that a communication hole is provided on the entire surface of the skin layer on the accommodation space side of the pair of skin layers . A sound insulation structure having a main body formed of a hollow plate-shaped sound absorbing panel and a plate-shaped sound absorbing material formed of a porous material.
The sound absorbing panel is formed with a hinge portion extending in the height direction.
The main body portion is formed in a tubular shape extending in the height direction by closing the hinge portion, and partitions a storage space for accommodating a noise source inside.
The sound absorbing panel has a plurality of cells and has a communication hole that opens to the accommodation space side to allow communication between the inside and outside of the cell.
The sound absorbing material is provided on the accommodation space side of the sound absorbing panel .
The hinge portion includes a first hinge portion and a second hinge portion configured by reducing the plate thickness of the sound absorbing panel.
The main body includes two square plate-shaped first sound absorbing panels, a square plate-shaped second sound absorbing panel, and a square plate-shaped third sound absorbing panel as the sound absorbing panels.
The first sound absorbing panel and the second sound absorbing panel are adjacent to each other via the first hinge portion, and the second sound absorbing panel and the third sound absorbing panel are adjacent to each other via the second hinge portion.
The first sound absorbing panel and the second sound absorbing panel are provided with the sound absorbing material, and the third sound absorbing panel is not provided with the sound absorbing material.
The width dimension of the third sound absorbing panel is shorter than the width dimension of the first sound absorbing panel and the width dimension of the second sound absorbing panel, and the thickness of the first sound absorbing panel, the thickness of the second sound absorbing panel, and the first. It is about the same as the thickness obtained by adding the thickness of the sound absorbing material provided on the 1 sound absorbing panel and the thickness of the sound absorbing material provided on the second sound absorbing panel.
The main body portion is used to partition the accommodation space by closing the first hinge portion and opening the second hinge portion, and by opening the first hinge portion and closing the second hinge portion. It is considered to be a folded non-use form,
At least one of the first hinge portion and the second hinge portion is configured to be detachable.
A sound insulation structure characterized by that.

Images