JP2001142467A - Sound absorbing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorbing plate which allows a sound wave to be smoothly transduced into vibration energy. SOLUTION: This sound absorbing plate is formed by loading sound absorbing material into a flat box which is composed of a surface plate, a back surface and side plates on the periphery thereof. The surface plate is made of a porous plate, brackets 11b, 15 are disposed on the inner part of the surface plate inside the side plate, the surface of the sound absorbing material 13 is pressed by the brackets, an interval S1 is formed over the whole surface between the sound absorbing material 13 and the surface plate, at the same time, projected lines 14 which protrude inwardly on proper positions in the back surface 11a are formed, the back face of the sound absorbing material 13 is pressed by the projected lines 14 and an interval S2 is formed over the whole surface between the sound absorbing material 13 and the back surface 11a. When the sound wave enters into the sound absorbing plate 10 from the surface, the plate 10, at first, performs the sound absorbing action based on the principle of the Hermholtz resonator, etc., by means of the porous surface plate 1, subsequently, acoustic energy is transduced to vibration energy and the sound absorbing is performed in the sound absorbing material 13. At this time, the smooth vibration of the sound absorbing material 13 is obtained owing to the intervals S1, S2 and a high sound absorbing effect is exhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing plate which is mounted on both side walls of an automobile road, a back wall (lower surface) of an elevated road, a factory site boundary wall, a building wall, and the like.

[0002]

2. Description of the Related Art Due to increasing interest in the living environment, a sound absorbing wall composed of a sound absorbing plate is constructed in a noise generating source to prevent the generated noise from being absorbed and cut off and diffused outside.

[0003] The sound absorbing plate is, for example, a Japanese Utility Model Laid-Open No. 6-579.
No. 12, as disclosed in FIG. 9 and FIG.
A sound absorbing material 5 is loaded in a flat box body 4 including a front plate 1, a back plate 2, and a side plate 3 around the back plate 2, and at least the front plate 1 is a perforated plate. The sound absorbing material 5 is made of glass wool or the like. When a sound wave enters in the direction of the arrow in FIG. 10, first, the sound absorbing function based on the principle of the Helmholtz resonator by the porous surface plate 1 and the like is performed, and then the sound absorbing layer (the sound absorbing material 5) is formed. Within), acoustic energy is converted to vibrational energy to absorb sound.

[0004]

As described above, this kind of sound absorbing plate is converted by the vibration energy in the sound absorbing material 5, so that the sound absorbing material 5 needs to be held so as to vibrate.

However, in the conventional sound absorbing plate, as shown in FIG. 10, the surface of the sound absorbing plate 5 is brought into contact with the surface plate 1, the back surface is brought into contact with the support rod 6, and the sound absorbing material 5 is firmly held on the front and back surfaces. And holding. For this reason, the sound absorbing material 5 could not vibrate sufficiently, and was insufficient in sound absorption coefficient.

An object of the present invention is to make it possible for a sound absorbing material to vibrate smoothly.

[0007]

In order to achieve the above object, according to the present invention, the sound absorbing material is vibrated between the inner surface of the box and the entire surface of the sound absorbing material and the entire back surface. The possible spacing was formed.

[0008] Due to the presence of this interval, the sound absorbing material vibrates smoothly and converts acoustic energy into vibration energy to absorb sound. The size of the interval is appropriately selected by experiments or the like based on the size of the sound absorbing plate, the material of the sound absorbing material, and the like so as to obtain effective vibration.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is as follows.
In a sound absorbing plate in which a sound absorbing material is loaded in a flat box body including a front plate, a back plate, and a side plate around the rear plate, the front plate is a perforated plate, and a bracket is provided inside the surface plate on the inner surface of the side plate. A configuration is adopted in which the sound absorbing material is pressed down on the surface to form an interval over the entire surface between the sound absorbing material and the surface plate, and the sound absorbing material can smoothly vibrate due to both the intervals.

In another embodiment, similarly, in a sound absorbing plate in which a sound absorbing material is loaded in a flat box body including a front plate, a back plate, and a side plate around the front plate, a front plate and a back plate on the inner surface of the side plate are used. Provide brackets inside each,
Hold down the front and back of the sound absorbing material with these two brackets,
The above-described gaps are formed between the sound absorbing material and the front plate and the back plate, and the sound absorbing material can be smoothly vibrated by both the gaps.

When sound waves penetrate from the surface, the sound-absorbing plate having these structures first performs a sound-absorbing action based on the principle of the Helmholtz resonator by the porous surface plate, as in the prior art.
Next, the sound energy is converted into vibration energy in the sound absorbing material to absorb sound. At this time, smooth vibration of the sound absorbing material is obtained due to the above-mentioned interval, and a high sound absorbing effect is exhibited.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. 1 to FIG.
The box body 11 has a rib 14 formed by bending in the middle of the bottom plate (back plate) 11a, and a tongue piece 11b is provided on the upper edge of the front surface. The left and right surfaces of the box body 11 are formed by fitting the side pieces 11c.

The lid 12 is made of perforated metal and has a tongue piece 12a on the lower edge of the front surface. The sound absorbing material 13 is made of glass wool or the like. The sound absorbing material 13 is loaded into the box main body 11, the cover 12 is put on the box main body 11 through the intervening metal member 15, and the box main body 11 is covered with screws or spot welding. 12 is fixed. At this time, the surface of the sound absorbing material 13 is covered with a protective sheet such as a glass cloth (not shown).

In this fixed state, as shown in FIG. 3, the back surface of the sound absorbing material 13 is supported by a rib 14, and the tongue 1
1b and the three-point support supported by being held by the intervening hardware 15, over the entire front and back surfaces of the sound absorbing material 13,
Gaps S1 and S2 are formed. These gaps S1 and S2 are 5
mm or more.

For example, as shown in FIG. 4, a required number of the sound absorbing plates 10 are stacked and fixed on the side wall W vertically and horizontally to form a soundproof wall. At this time, the end faces in the longitudinal direction of the sound absorbing plate 10 are fitted with each other to effectively prevent sound transmission at the boundary of the sound absorbing plate 10. That is, it also has an effective sound insulation effect.

FIGS. 5 to 7 show another embodiment in which the fitting structure of the sound absorbing plates 10 is changed, and the sound absorbing plate 10 is provided with a tongue 11b on the front side and a bracket 15 on the rear side. The gaps S1 and S2 are formed by supporting the material 13. The sound absorbing plate 10 forms a sound absorbing wall as shown in FIG. In the figure, 11d is a rear plate of the box body 11,
The rib 14 can be omitted.

The support of the back plate 11 by the ribs 14 is not limited to one place, but may be any two or more points as shown in FIG.
Further, the bracket such as the tongue piece 11b may not be formed over the entire length of the peripheral upper edge, but may be provided intermittently at an appropriate position.

[0018]

As described above, according to the present invention, the sound absorbing performance is improved and the device is made robust.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is a sectional view of the embodiment.

FIG. 4 is a sectional view showing the construction of the embodiment.

FIG. 5 is a perspective view of another embodiment.

FIG. 6 is a sectional view of the embodiment.

FIG. 7 is a sectional view showing the construction of the embodiment.

FIG. 8 is a sectional view of another embodiment.

FIG. 9 is a perspective view of a conventional example.

FIG. 10 is a sectional view of the same.

[Explanation of symbols]

 Reference Signs List 10 sound absorbing plate 11 box body 11a bottom plate (back plate) 11b tongue piece (bracket) 12 lid 13 sound absorbing material 14 rib 15 intervening hardware (bracket) S1, S2 gap

Continued on the front page F term (reference) 2D001 AA01 BA03 BB01 CA02 CB02 CD03 2E001 DF04 FA03 FA30 GA07 GA18 GA24 GA45 HA33 LA01 LA05 5D061 AA22 BB02 BB18 BB21 BB35 BB37

Claims (3)

[Claims] 1. A sound absorbing plate in which a sound absorbing material 13 is loaded in flat box bodies 11 and 12 each comprising a front plate, a back plate, and side plates around the back plate, wherein the surface plate is a perforated plate and the sound absorbing material is 13. A sound absorbing plate, wherein intervals S1 and S2 at which the sound absorbing plate 13 can vibrate are formed between the inner surface of the box and the entire surface of the front surface and the back surface of the box. 2. Brackets 11b and 15 are provided on the inner surface of the side plate inside the surface plate.
The space S1 is formed between the sound-absorbing material 13 and the surface plate by pressing the surface of the sound-absorbing material 13 with b and 15, and the inwardly projecting ridge 14 is formed on the back plate 11a at an appropriate position. The sound absorbing plate according to claim 1, wherein the back surface of the sound absorbing material (13) is held down by 14 to form the space (S2) between the sound absorbing material (13) and the back material (11a). 3. Brackets 11b and 15 are provided on the inner surface of the side plate inside the front plate and the rear plate, respectively, and the front and rear surfaces of the sound absorbing material 13 are pressed by the brackets 11b and 15 to form the sound absorbing material 13 and the front plate. The sound absorbing plate according to claim 1, wherein the gaps (S1, S2) are formed between the sound absorbing plate and the back plate (11a).