JP2008144580A - Soundproofing panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproofing panel which displays excellent sound absorbing performance in a wide range of frequency bands and whose soundproofing components are easy to be recycled. <P>SOLUTION: The soundproofing panel 5 is provided with a rectangular shaped frame 5b that has a back plate 5c at one side, and sound absorbing materials contained within a casing 5a covered with a detachable front plate 5d provided with a plurality of sound wave passages pa allowing sound waves to pass through at the other open side thereof. Each sound absorbing material having an aluminum foil 5f with innumerable fine through holes are provided across air layers between the back plate 5c and the front plate 5d within the soundproofing panel casing 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a soundproof panel and a soundproof wall, and more specifically, is highly recyclable and lightweight, and can absorb noise in a wide frequency band from a low frequency band to a high frequency band. The present invention relates to a soundproof panel.

  As a sound-absorbing structure, a structure having a combination of a porous sound-absorbing member such as glass wool and a material excellent in weather resistance, water resistance, and heat resistance has been conventionally used. However, with such a sound absorbing structure, the weather resistance, water resistance, and heat resistance of glass wool could be compensated, but it was not sufficient, and the problem of recyclability was not solved. In addition, when using a resonator type sound absorbing structure or a plate vibration type sound absorbing structure which is a sound absorbing structure other than the case where a porous sound absorbing member typified by glass wool is used, due to the sound absorbing mechanism, There was a problem. That is, since the sound absorption mechanism is energy dissipation due to a resonance phenomenon, the sound absorption frequency band is narrow and the sound absorption performance is inferior to that of a porous sound absorbing member such as a porous sound absorbing member such as glass wool.

  As a sound-absorbing structure that can solve the above-mentioned problems, for example, a structure that will be described later using an aluminum foil or an aluminum thin plate is known. The sound absorbing structures according to the conventional examples 1 and 2 will be described with reference to the accompanying drawings.

  First, the sound absorbing structure according to Conventional Example 1 will be described with reference to FIG. 7 of its perspective view and FIG. 8 of its sectional view. That is, in this sound absorbing structure, the first thin film 41 made of a metal thin film such as an aluminum foil and the second thin film 42 are laminated so as to be adjacent to each other. As shown in FIG. 8, the first thin film 41 and the second thin film 42 are formed with a large number of protrusions a directed to one side in the stacking direction of the first thin film 41 and the second thin film 42. Has been. Therefore, according to the soundproof structure according to the conventional example 1, when sound waves are incident, the first and second thin films 41 and 42 vibrate and the overlapping portions come into contact with each other and rub against each other. The energy dissipation occurs and the sound is absorbed.

  In the sound absorbing structure configured as described above, as described above, the sound energy is dissipated by the mechanism in which the first and second thin films 41 and 42 come into contact with each other and rub against each other. In comparison, excellent sound absorption performance can be exhibited in a wider frequency band. Moreover, by adopting a metal foil such as aluminum as the material of the first and second thin films 41 and 42, it is difficult to recycle the conventional sound absorbing structure such as glass wool, which had to be disposed of as shredder dust. In comparison, the sound absorbing structure can be easily recycled. The first and second thin films 41 and 42 are provided with a large number of fine through holes (see, for example, Patent Document 1).

  Next, a soundproof structure according to Conventional Example 2 will be described with the same name used in the publication with reference to FIG. That is, the soundproof structure according to the conventional example 2 is configured such that the exterior plate 51 and the interior plate 52 having a large number of through holes 52a are arranged to face each other. The interior plate 52 is set so that the plate thickness, the hole diameter, and the opening ratio satisfy a design condition to be described later that causes a viscous action to occur in the air flowing through the through hole 52a. In this setting condition, the frequency bandwidth that provides a sound absorption coefficient of 0.3 or more is set to 10% or more with respect to the resonance frequency. Reference numeral 53 denotes an air layer.

According to such a soundproof structure according to Conventional Example 2, by generating a viscous action in the air, the conversion of air vibrations due to the viscous action into thermal energy is promoted, resulting in sufficient sound absorption performance in a wide frequency bandwidth. Is surely demonstrated. Thereby, in addition to the noise at the resonance frequency, excellent sound absorbing performance is exhibited for noise other than this frequency. Note that the exterior plate 51 and the interior plate 52 having a soundproof structure according to the conventional example 2 are formed of a metal such as iron or aluminum or a synthetic resin (see, for example, Patent Document 2).
JP 2004-264374 A Japanese Patent Laid-Open No. 2003-50586

  According to the sound absorbing structure according to Conventional Example 1 disclosed in the above Japanese Patent Laid-Open No. 2004-264374 and the soundproof structure according to Conventional Example 2 disclosed in the Japanese Patent Laid-Open No. 2003-50586, as described above, resonance Compared to a sound absorbing structure that uses only the phenomenon to dissipate sound wave energy, it can exhibit excellent sound absorbing performance in a wide frequency band. In addition, since the sound absorbing member constituting the sound absorbing structure according to Conventional Example 1 and the soundproof structure according to Conventional Example 2 can be easily recycled, it is extremely excellent. Therefore, if the sound absorption structure according to Conventional Example 1 or the soundproof structure according to Conventional Example 2 can be used as, for example, a soundproof wall for an expressway, it can greatly contribute to the elimination of noise pollution. It is thought that it becomes.

  However, in any of the publications related to the conventional examples 1 and 2, only a basic concept of a sound absorbing structure or a soundproof structure is disclosed, and a specific structure is not disclosed.

  Accordingly, an object of the present invention is to provide a soundproof panel that can exhibit excellent sound absorbing performance in a wide frequency band and in which the sound absorbing member can be easily recycled.

  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above-described problem, the means employed by the soundproof panel according to claim 1 of the present invention includes a rectangular frame portion, and A soundproofing member in which a sound absorbing member is housed in a case that includes a back plate on one side of the frame portion and that is covered with a detachable front plate that has a plurality of sound wave passages on the other opening side through which sound waves can pass. In the panel, the sound absorbing member is a planar metal member provided in the case with an air layer between the back plate and the front plate, and provided with a number of fine through holes. It is characterized by.

  In the soundproof panel according to claim 1 of the present invention, the planar metal member provided with a large number of fine through-holes which are sound absorbing members of the soundproof panel is between the back plate of the case and the front plate of the case. The air layer is provided apart. Therefore, according to the soundproof panel according to the first aspect of the present invention, since the air layer is formed, a sound wave resonance phenomenon occurs between the air layers, and a large number of fine through holes opened in the planar metal member. Viscous action occurs in the vibrated air, which causes the sonic energy to disappear.

  In addition, according to the soundproof panel of the first aspect of the present invention, the conversion of air vibration into thermal energy is promoted by the viscous action of air, and as a result, sufficient sound absorption performance is reliably exhibited over a wide frequency bandwidth. Therefore, in addition to the noise at the resonance frequency, excellent sound absorbing performance is exhibited for noise other than this frequency. Therefore, as in the case of the soundproof structures according to the conventional examples 1 and 2, the sound absorption performance is excellent in a wider frequency band than the sound absorption structure that dissipates the sound wave energy by using only the resonance phenomenon. Can do.

  In the soundproof panel according to claim 1 of the present invention, the sound absorbing member is formed of a planar metal member. Therefore, according to the soundproof panel according to claim 1 of the present invention, it is easier to recycle compared to a difficult-to-recycle material such as glass wool having a sound absorbing structure according to the related art that had to be disposed of as shredder dust or the like.

  Hereinafter, soundproof panels according to Embodiments 1 and 2 of the present invention will be described with reference to the attached drawings.

  The soundproof panel according to Embodiment 1 of the present invention will be described below with reference to the attached drawings. 1 is a front view of a soundproof wall using a soundproof panel according to the first embodiment of the present invention, FIG. 2 is a schematic front view of the soundproof panel according to the first embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG.

  Reference numeral 1 shown in FIG. 1 denotes a soundproof wall using the soundproof panel according to Embodiment 1 of the present invention. The soundproof wall 1 uses 16 soundproof panels 5 configured as described later. As shown in FIGS. 2 and 3, the soundproof panel 5 is made of aluminum and includes a rectangular case 5a (described later) and a sound absorbing member (described later) housed in the case 5a. The case 5a includes a rectangular frame portion 5b, and includes a back plate 5c on one side of the frame portion 5b, and the other opening side includes a plurality of sound wave passages Pa through which sound waves can pass. It is covered with a free front plate 5d having a thickness of 0.8 mm.

  In the case of the first embodiment, the sound wave passage Pa through which the sound wave can pass is a through hole having a diameter of 0.8 mm. After the soundproof panel 5 according to Embodiment 1 is attached to the soundproof wall frame, sound waves are passed through the surface of the front plate 5d of the soundproof panel 5 into the soundproof panel 5 and rain into the soundproof panel 5 is observed. A louver 1a for preventing the intrusion is attached.

  The sound absorbing member is provided at each of the upper and lower corresponding positions in the case 5a, with an air layer between the back plate 5c, the front plate 5d, and itself. Edges are engaged with three pairs of end locking portions 5e each having a hole having a circular cross section along the longitudinal direction and a groove communicating with the hole from the opposite side via a round bar-like engaging member 5g. It is composed of three aluminum foils 5f that are stopped and provided with a large number of fine through holes (the diameter of the through holes is, for example, about 0.1 mm).

  Each of these three aluminum foils 5f is attached by fitting the engaging member 5g into the hole of the end locking portion 5e. Of course, after the mounting operation is completed, the side members are fixed to form the case 5a. In the case of the first embodiment, the aluminum foil 5f has a three-layer structure. However, the aluminum foil 5f is not limited to a three-layer structure, and should be changed according to specifications.

  In the soundproof panel 5 according to the first embodiment, the thickness of the aluminum foil 5f is 30 μm. In this case, the end locking portion 5e is formed in a shape having a hole having a circular cross section, and the engaging member 5g has a round bar shape. However, the present invention is not limited to this, and, for example, the end locking portion 5e can be formed in a shape having a square cross section, and the engagement member 5g can be formed into a square bar shape. That is, since an extrusion mold material is used, the above can be easily realized. Such a soundproof panel 5 is manufactured at a factory and is transported to the site and attached to a soundproof frame.

  Hereinafter, the operation mode of the soundproof panel 5 according to Embodiment 1 of the present invention will be described. That is, in the soundproof panel 5 according to the first embodiment, as described above, the aluminum foil 5f provided with a number of fine through holes of the soundproof panel 5 is between the back plate 5c of the case 5a and the case 55a. An air layer is provided between the front plate 5d and the front plate 5d.

  Therefore, according to the soundproof panel 5 according to the first embodiment of the present invention, as in the soundproof structure according to the conventional example 2, a sound wave resonance phenomenon occurs between the air layers, and a large number of fine holes opened in the aluminum foil 5f. As a result of viscous action occurring in the air that vibrates vigorously in the through-hole, and conversion to thermal energy is promoted by the viscous action of the air, sufficient sound absorption performance is reliably exhibited over a wide frequency bandwidth. Thereby, in addition to the noise at the resonance frequency, it is possible to exhibit excellent sound absorption performance for noise other than this frequency.

  Further, according to the soundproof panel 5 according to the first embodiment of the present invention, since the aluminum foil 5f is used as the sound absorbing member, it is disposed of as shredder dust or the like as in the soundproof structure according to the conventional example 1 or 2. Recycling is easier compared to difficult-to-recycle materials such as glass wool with a sound-absorbing structure that must be used.

  A soundproof panel according to Embodiment 2 of the present invention will be described with reference to FIG. 4 which is a schematic cross-sectional view thereof. The soundproof panel 6 according to the second embodiment of the present invention is made of aluminum including a rectangular case 6a and a sound absorbing member to be described later housed in the case 6a. The case 6a includes a rectangular frame portion 6b, and includes a back plate 6c on one side of the frame portion 6b, and the other opening side includes a plurality of sound wave passages Pa through which sound waves can pass. It is covered with a free front plate 6d. In this case, the sound wave passage Pa is a through hole having a diameter of 0.8 mm.

  The sound absorbing member is provided at each of the upper and lower corresponding positions in the case 6a, with an air layer between the back plate 6c, the front plate 6d, and itself. From three aluminum foils 6f each having an edge attached to the surface of three pairs of sticking members 6e having a flat strip shape projecting in opposite directions with a double-sided tape, and provided with a number of fine through holes. It is configured. In this case, the aluminum foil 6f has a three-layer structure. However, as in the case of the first embodiment, the aluminum foil 6f is not particularly limited to the three-layer structure and should be changed according to specifications. The thickness of the aluminum foil 6f is 30 μm.

  Hereinafter, the operation mode of the soundproof panel 6 according to the second embodiment of the present invention will be described. That is, according to the soundproof panel 6, as in the soundproof structure according to the conventional example 2, by generating a viscous action on the air, the conversion of the air vibration by the viscous action into thermal energy is promoted, resulting in a wide frequency range. Sufficient sound absorption performance is reliably demonstrated in the bandwidth. Thereby, in addition to the noise at the resonance frequency, excellent sound absorbing performance is exhibited even for noises other than this frequency, so that the soundproof panel according to the first embodiment is effective.

Further, the edge of the aluminum foil can be attached to the inner wall of the case by means described later other than the first and second embodiments.
(1) The edge of the aluminum foil is sandwiched between the opposing surfaces of the fitting part of the fitting type case composed of a male frame and a female frame. (Embodiment 3)
(2) The edge of the aluminum foil is provided with an edge attachment member having a screw hole at the edge, and the edge attachment member is fixed by a screw fitted in a hole provided in the case. (Embodiment 4)
(3) The edge of the aluminum foil is clamped by a lateral M-shaped clamping formation portion formed on the inner wall of the case. (Embodiment 5)
(4) The edge of the aluminum foil is hung on the parallel hung members provided on the opposite inner wall sides of the case. (Embodiment 6)

  In the soundproof panels according to Embodiments 1 to 6 of the present invention, aluminum foil is used as the sound absorbing member. However, an aluminum thin plate can be used, and an aluminum plate in which fibers are attached to the surface is used. Moreover, the aluminum foil by which a fiber is stuck on the surface can also be used.

  By the way, in the soundproof panel according to Embodiments 1 to 6 of the present invention, the sound absorbing effect of the soundproof panel is improved by providing a plurality of partition plates in a direction orthogonal to the longitudinal direction inside the case of the soundproof panel. An excellent soundproofing effect can be obtained.

  More specifically, by providing a partition plate with an interval smaller than ½ of the wavelength of the sound to be soundproofed, sound waves that have entered the soundproof panel can be advanced in a direction perpendicular to the sound absorbing member, so that the soundproof panel The sound absorption effect is improved. In addition, by providing partition plates at intervals other than a multiple of 1/2 of the wavelength of the sound to be sound-proofed, the sound waves that have entered the sound-proof panel are prevented from traveling in the direction along the sound-absorbing member, and are orthogonal to the sound-absorbing member. The sound absorption effect of the soundproof panel is improved because the soundproof panel can be moved in the direction.

  Furthermore, by providing a partition plate at random intervals for a plurality of frequencies to be soundproofed, it is possible to prevent a decrease in sound absorption performance of sound waves having a specific frequency that has entered the soundproof panel. The sound absorption effect of the soundproof panel for the sound of the frequency is improved. Therefore, any one of the three types of soundproof panels having the above configuration is fitted into each of the plurality of panel mounting frames of the soundproof wall frame to form a soundproof wall, thereby realizing a soundproof wall with better soundproof performance. can do.

When arranging a plurality of partition plates in a direction perpendicular to the longitudinal direction inside the case of the soundproof panel, one of the following two methods may be used.
(1) After arranging the sound absorbing member in the case, a plate-like partition plate is inserted and installed from one end side of the case.
(2) A plate-shaped partition plate is disposed when the sound absorbing member is disposed in the case. The material of the partition plate may be metal (preferably from the viewpoint of recyclability) or resin, and is not particularly limited to the material. In addition, the partition plate may be disposed on the sound absorbing member with an adhesive or the like, or may be disposed on the constituent member on the end surface of the case and not connected to the sound absorbing member.

Hereinafter, the Example which measured the oblique incidence sound absorption coefficient of the soundproof wall using the soundproof panel 5 which concerns on Embodiment 1 of this invention is demonstrated. This oblique incidence sound absorption coefficient measurement test was performed using equipment having a configuration as shown in FIG. That is, the reflected sound in the specular direction when the impulse sound is incident on the completely reflecting surface (concrete floor) at a certain angle and the reflected sound when the sample (soundproof wall) is installed on this completely reflecting surface are measured. From the result, the oblique incident sound absorption coefficient α (θ) is obtained by the following equation. However, E _s (f) and E _r (f) in the following formula are energy spectra of reflected pulses on the complete reflection surface when the sample (soundproof wall) is installed.
α (θ) = 1−E _s (f) / E _r (f)
Note that θ is obtained by arithmetically averaging α (θ) measured every 15 ° from 0 ° to 45 °.

  The sound absorption coefficient of the soundproof wall using the soundproof panel shown in FIG. 3 (the soundproof panel 5 according to Embodiment 1 of the present invention) is 70 to 70 in a frequency band of 400 to 3150 Hz, as shown in FIG. 90%, which indicates that the sound absorption performance is extremely excellent.

  In the soundproof panels according to the first to sixth embodiments, aluminum is used as the material of the metal member constituting the sound absorbing member. However, metal plates such as a steel plate, a copper plate, a magnesium plate, and a titanium plate are also used. Since it can be used, it is not limited to aluminum. In addition, since the soundproof panels according to the first to sixth embodiments are merely examples of the present invention, the scope of the technical idea of the present invention is limited by these first to sixth embodiments. is not.

It is a front view of the soundproof wall using the soundproof panel which concerns on form 1 of this invention. It is a typical front view of the soundproof panel which concerns on form 1 of this invention. It is the sectional view on the AA line of FIG. It is a typical cross-sectional view of the soundproof panel according to Embodiment 2 of the present invention. It is an oblique explanatory sound absorption coefficient measurement test condition explanatory drawing. It is a sound absorption coefficient explanatory graph figure of the soundproof wall using the soundproof panel (Soundproof panel 5 which concerns on Embodiment 1 of this invention) shown in FIG. It is a perspective view of the soundproof structure which concerns on the prior art example 1. FIG. It is sectional drawing of the soundproof structure which concerns on the prior art example 1. FIG. It is sectional drawing of the soundproof structure which concerns on the prior art example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Soundproof wall, 1a ... Galley 5 ... Soundproof panel, 5a ... Case, 5b ... Frame part, 5c ... Back plate, 5d ... Front plate, 5e ... End part latching part, 5f ... Aluminum foil, 5g ... Engagement member 6 ... Soundproof panel, 6a ... Case, 6b ... Frame, 6c ... Back plate, 6d ... Front plate, 6e ... Adhering member, 6f ... Aluminum foil pa ... Sound wave passage

Claims (1)

  In a case provided with a rectangular frame portion, a back plate on one side of the frame portion, and the other opening side covered with a removable front plate having a plurality of sound wave passages through which sound waves can pass In the soundproof panel in which the sound absorbing member is housed, the sound absorbing member is provided in the case with an air layer between the back plate and the front plate, and a large number of fine through holes are provided. A soundproof panel, which is a planar metal member provided.

Images