JP3367030B2 - Silencing method and silencing panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening method and a sound deadening panel for absorbing sound from a wide area as much as possible and for muting sound by repeating sound absorption and attenuation.

[0002]

2. Description of the Related Art A conventionally known box type sound absorbing panel is
A large number of through holes (aperture ratio 55% to 65%) were provided in the wall plate on the sound source side, and a sound absorbing material such as glass wool was filled in the box.

Also, a structure is known in which a slit (aperture ratio of about 60%) is provided in a wall plate instead of the through hole, and a cover plate is projected in each slit to prevent rainwater from entering. .

[0004]

According to the above-mentioned conventional panel, when the opening ratio of the sound absorbing port is improved, the strength of the front wall plate is reduced, which may reduce the strength of the panel. In addition, since there is no guide plate, rainwater will infiltrate (a rainwater shelter will interfere with induction), water will accumulate in the panel, or it will adhere to the sound absorbing material and reduce its durability.
There is a problem that the material of the sound absorbing material is restricted. Further, since the sound absorbing material is filled in the panel, there is a possibility that the sound absorbing material may reflect sound other than that absorbed by the sound absorbing portion to the outside.

Furthermore, only sound absorption is possible, and attenuation due to circulation or the like was not considered.

[0006]

SUMMARY OF THE INVENTION According to the present invention, an opening ratio of a sound absorbing port of a wall plate is increased and a guide plate having an appropriate angle with respect to a sound source side is provided, and an annular circulation of guide sound is provided behind the wall plate. By providing a passage and installing a sound absorbing plate in the circulation passage, the above-mentioned conventional problems are solved.

That is, the invention of the method is a sound deadening method characterized in that a sound wave is received from a passage opening toward a sound source, the outer circumference of the sound absorbing material is rotated, and the sound is absorbed and attenuated to cancel the sound.

According to the invention, a sound absorbing port is formed in parallel with the wall plate on the sound source side of the box-shaped panel with an opening ratio of 70% or more.
Each sound absorbing port is integrally provided with a guide plate having an appropriate angle with respect to the sound source side, and inside the panel, sound absorbing plates are installed at predetermined intervals in the front and rear and the upper part to form an annular path, and a rear wall. A sound deadening panel having a sound absorbing plate layered on the inner surface.
Next, in another invention, the sound absorbing plate is pressure-molded glass wool and the surface thereof is covered with glass cloth, and the guide plates provided at the respective sound absorbing ports have variable angles, and the drive system of the guide plates is a control system. Is a concatenation of the outputs of.

The sound absorbing plate mentioned above is formed by press-molding glass wool into a plate shape and covering the outer surface with glass cloth.

The thickness of the sound absorbing plate is preferably 50 mm or more, and more preferably 50 mm to 100 mm. Further, it is practical that the distance between the sound absorbing plate and the wall plate in the circulation path is about 50 mm to 100 mm, and one circulation length is preferably 100 mm or more.
As the material of the sound absorbing plate (sound insulation material) of the present invention, a pressed product of plant fiber, sand, etc. can be used in addition to glass wool. The form of the sound absorbing plate is not limited to a single pressure-molded plate, but may be a lamination of thin plates, the use of a porous material, or any other material and form conventionally used as a sound absorbing plate. In the present invention, the case where the angle of the guide plate is changed is a case where the guide plate is installed in a place where the direction of the sound source changes.

[0011]

According to the present invention, since the opening ratio of the sound absorbing hole can be increased and the guide plate is provided, noise and the like can be guided as much as possible. Further, since the air gap is provided behind the sound absorbing hole, the air gap is formed as an annular circulation path, and the sound absorbing plate is installed in the circulation path, the induced noise is effectively silenced by sound absorption and attenuation.

[0012]

First Embodiment The present invention will be described with reference to the embodiments shown in FIGS.

A top plate 2 and a bottom plate 3 having a predetermined width are provided above and below the rear wall plate 1.
And are projected and fixed at a right angle to the front, and the front wall plate 4 is fixed to the front part between the top plate 2 and the bottom plate 3 in parallel with the rear wall plate 1. The front wall plate 4 has horizontally long sound absorbing ports 5 and 5 having an opening ratio of 85.
%, And guide plates 6, 6 of 30 ° to 60 ° are integrally provided along the edges of the sound absorbing ports 5, 5. The front wall plate 4 is formed of, for example, an aluminum material, the guide plate is integrally extruded, and the sound absorbing ports 5 and 5 are drilled. A sound absorbing plate 7 made of glass wool is layered on the inner surface of the rear wall plate 1, and a predetermined gap is maintained between the inner surface of the sound absorbing plate 7 and the inner surface of the front wall plate 4 above and below the glass wool. The core sound absorbing plate 8 is installed. The core sound absorbing plate 8, the sound absorbing plate 7, the front wall plate 4, and the upper and lower closing plates 9 and 10 form a circulation path 11. The closing plates 9 and 1
0 connects the upper and lower sides of the rear wall plate 1 and the front wall plate 4 in an arcuate cross section, and forms the circulation path 11 in a substantially elliptical cross section.

In the above embodiment, the arrow 1 from the sound source 12
When the noise propagates as shown in 3, the noise is indicated by arrows 14 and 1
5 and 16 enter the circulation path 11 directly or by being reflected by the guide plates 6 and 6, and when the circulation path 11 is entered, directionality is imparted and circulation is performed as indicated by arrows 17, 18, 19, and 20. The sound absorbing plate 7 and the core sound absorbing plate 8 absorb the sound midway, and the sound is attenuated during circulation, so that the sound deadening effect can be remarkably improved as a whole (for example, the sound deadening rate is 15% to 40%).

The angle of the guide plate in the above-mentioned embodiment is premised on the sound source position of the main noise that can be placed in advance at the installation location of the panel,
Determine the angle that most efficiently induces noise. For example, in the case of the Shinkansen, the noise generated by the wheels is used as the main noise, and it is determined corresponding to each sound source.

[0016]

Second Embodiment Next, the embodiment of FIGS. 3 and 4 will be described.

A top plate 2 and a bottom plate 3 having a predetermined width are fixed to the upper and lower sides of the rear wall plate 1 so as to project forward at a right angle, and the front wall plate 4 is attached to the front portion between the top plate 2 and the bottom plate 3 by a rear wall. Fix parallel to plate 1.
The front wall plate 4 has horizontally elongated sound absorbing ports 5 and 5 having an opening ratio of 80.
%, And the rotary shafts 21 and 21 are installed along the edges of the sound absorbing ports 5 and 5, respectively.
Is rotatably installed by bearings 23, 23 provided on adjacent walls 22, 22 laterally of the sound absorbing ports 5, 5. Worm gears 24, 24 are fixed to the respective rotary shafts 21, 21, the worm gears 24, 24 engage a worm 26 of a drive shaft 25, and the drive shaft 25 is connected to a shaft 28 of a pulse motor 27.

In the above, if the position of the sound source changes, 29
a, 29b, 29c, etc., and the output (pulse) of the control computer 30 is detected by a single or a plurality of detectors, and the output is input to the control computer 30. input. If, for example, a pulse motor 27 is used as a drive system to rotate the motor shaft 28, the drive shaft 25 connected to the motor shaft 28 rotates, and the rotary shaft 2 passes through the worm 26 and the worm gear 24.
1 rotates to the right or left as indicated by the arrow 31, which causes the guide plate 33 to move as indicated by the arrow 32.
The angle of can be adjusted. According to the above embodiment,
The guidance efficiency can be improved by adjusting the angle of the guide plate 33 when the sound source moves.

In the above embodiment, only the angle adjustment of the guide plate is described, but the installation angle of the entire panel can be changed.

[0020]

According to the present invention, since the guide plate is integrally formed on the front wall, the guide plate reinforces the panel, and the aperture ratio of the sound absorbing port can be remarkably improved. Also, when the angle of the guide plate is variable, the front wall can be reinforced together with the rotary shaft by inserting the rotary shaft and projecting the rotary shaft abutting portion. The aperture ratio can be improved.

Since the circulation path is provided on the back side of the front wall,
When inducing noise, the induction resistance becomes smaller and the induction rate can be improved as compared with the conventional panel filled with the sound absorbing material.

Next, since the sound absorbing plate is provided in the circulation path, it is possible to remarkably improve the sound deadening effect of the induced sound by absorbing and damping the sound.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment panel of the present invention.

FIG. 2 is a front view in which a part is also omitted.

FIG. 3 is a sectional view in which a part of another implementation panel is omitted.

FIG. 4 is a partial front view showing a state where the rotary shaft is installed.

FIG. 5 is a cross-sectional view showing a drive system of which a part is omitted.

FIG. 6 is a block diagram of a control system of the same.

[Explanation of symbols]

1 rear wall board 2 top plate 3 bottom plate 4 front wall board 5 Sound absorption mouth 6 Information board 7 sound absorbing board 8 core sound absorbing board 9, 10 Closure plate 11 circuit 12 sound sources

Claims (5)

(57) [Claims] 1. A sound deadening method comprising receiving a sound wave from a passage opening toward a sound source, rotating the outer periphery of a sound absorbing material, and muting the sound wave by absorbing and attenuating the sound wave. 2. An aperture ratio of 70 to the wall plate on the sound source side of the box-shaped panel.
% Or more sound absorbing ports are provided in parallel, and each sound absorbing port is integrally provided with a guide plate having an appropriate angle with respect to the sound source side. Inside the panel, the sound absorbing plates are provided at a predetermined interval in the front and rear and the upper part. Is installed to form an annular path, and a sound absorbing plate is layered on the inner surface of the rear wall. 3. The sound deadening panel according to claim 2, wherein the sound absorbing plate is made of pressure-molded glass wool, and the surface of which is covered with glass cloth. 4. The sound deadening panel according to claim 2, wherein a guide plate provided at each sound absorbing port has a variable angle, and a drive system of the guide plate is connected to an output of a control system. 5. The sound deadening panel according to claim 2, wherein the sound source side wall plate is formed by integrally extruding the sound absorbing hole perforating plate and the guide plate.