JPS595783Y2 - Silencer ventilation system for buildings - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that is attached to the wall of a building and that ensures air circulation even though it attenuates the transmission of sound from inside and outside.

Air circulation between the inside and outside of a building is an essential condition for livability, and ventilation holes are provided at required locations in the building, such as on walls.

However, since ventilation holes ensure free air circulation, sound can also be freely distributed and transmitted, so outdoor noise may enter the room through the ventilation holes and destroy the quiet atmosphere, or There was a defect that the sounds emitted by pianos, stereos, etc. were emitted outside, causing a nuisance to other nearby residents.

Therefore, the inventor conducted research and development with the aim of creating a device that can effectively attenuate the transmission of sound between the outdoors and indoors while still ensuring free ventilation. This is the structure of the present invention.

In order to quickly understand the structure of the present invention, a detailed explanation will be given below based on an example diagram.

That is, as shown in FIGS. 1 to 4, a partition wall 3 is provided in the interior of an inner cylinder body 2 having a desired cross-sectional shape with through holes 1 dotted in the peripheral wall so as to be located approximately halfway from both ends, and the inner cylinder A cover plate 4 projecting like a brim from the outer periphery is fixed to both ends of the body 2, and a ventilation hole 5 is formed in each of the cover plates 4 at both ends so as to communicate with the inside of the inner cylindrical body 2. A flexible sound-absorbing layer 8 is laid on the inner surface of the outer cylinder 7 which has a desired cross-sectional shape and has a sufficient internal volume to form a ventilation chamber 6 on the outer periphery of the cylinder 2. The inner cylindrical body 2 is inserted through the inner cylindrical body 2 so as to be located in the center, and the outer cylindrical body 7 is inserted so that the ventilation chamber 6 around the outer periphery of the inner cylindrical body 2 is sealed.
It is constructed by fixing the lid plates 4 at both ends of the inner cylindrical body 2 by abutting the mounting portions 9 provided at both ends thereof.

Now, in the above device of the present invention, the inner cylinder body 2 and the outer cylinder body 7 may be made of any material such as plastic, metal, wood, etc., but they should be as durable as possible and noiseless. It is preferable to select a material that does not resonate with the vibrations of the building and is easy to manufacture.The appropriate cross-sectional shape is a rectangular, circular, polygonal, etc. shape that gives an aesthetic appearance to the building and harmonizes with it.

In addition, the shape of the through hole 1 provided in the peripheral wall of the inner cylinder body 2 is circular;
The partition wall 3 is not limited to a rectangular or groove shape, and the purpose can be achieved even if the partition wall 3 provided inside the inner cylinder body 2 is positioned toward either end.

The shape of the ventilation hole 5 provided in the cover plate 4 is not limited to the screen shape shown in the figure, but may also have an appropriate design shape such as a lattice shape or a dotted shape with round holes. If the cylinder body 2 is shaped so as to be inclined downward from the inside to the outside, rainwater and dust can be prevented from entering.

The flexible sound absorbing layer laid on the inner surface of the outer cylinder 7 is made of a flexible resin material such as polyurethane foam, or a flexible elastic material with large air gaps such as felt material. is optimal.

In order to insert and arrange inside the outer cylinder 7 and fix the inner cylinder 2,
In addition to the structure shown in the figure in which the outer circumferential portion of the cover plate 4 provided at both ends of the inner cylinder body 2 is fixed by abutting on the removable portions 9 provided at both ends of the outer cylinder body 70, the outer circumference of the cover plate 4 The structure may be such that the portion is enlarged and fixed directly to both end surfaces (edges) of the outer cylinder body 7.

Note that the fixing structure between the cover plate 4 at both ends of the inner cylinder body 20 and both ends of the outer cylinder body 7, or the fixing structure between both ends of the inner cylinder body 2 and the cover plate 4, can be fixed by tightening with screws, screwing, fitting, etc. If it is configured to be detachable, it is convenient because it is easy to attach it to a building, clean it, and wash it.

Next, the usage state of the device according to the present invention will be explained below based on the embodiment diagrams.

FIG. 5 shows the device according to the present invention being used by being attached to the wall W of a building.

Therefore, the outer cylindrical body 7 is fitted into the attachment hole 10 provided in the wall W. It is formed to be larger than the outer diameter of the outer cylinder 7 and is in contact with the wall W, and the side located in the outdoor O (the right side of the wall W in the figure) separated by the wall W is fitted to the outer periphery of the outer cylinder 7. A decorative edge plate 11 is brought into contact with the wall W, and the wall W is clamped between the cover plate 4 on the side of the door I and the decorative edge plate 11 on the side of the outdoor O, and the outer cylinder body 7 is fixed.

In addition, FIG. 5 shows a structure in which the lid plates 4 at both ends of the inner cylindrical body 2 are removably fixed to mounting portions 9 provided at both ends of the outer cylindrical body 7 with screws 12, respectively.

Figure 6 also shows how the device according to the present invention can be used on a wall W in a building.
It was used by attaching it to beam B installed on the top of the.

In the device shown in FIG. 6, the areas of the cover plates 4 at both ends are enlarged so as to largely protrude from the outer periphery of the outer cylinder 7, and the cover plates 4 are attached to both ends of the outer cylinder 7 by screws 12, respectively. It has a removably fixed structure.

Therefore, the outer cylindrical body 7 is fitted into the attachment hole 10 provided in the beam B,
The beam B is clamped and fixed by the lid plates 4 at both ends, but the entire device is shifted toward the outdoor O side, and the thickness of the beam B is equal to the length of the screw 12 that fixes the lid plate 4 on the indoor I side. Adjust.

When used as shown in FIG. 6, it is preferable to have a structure in which the inner cylindrical body 2 is fixed to attachment portions 9 provided at both ends of the outer cylindrical body 7 by screwing or the like.

When the device according to the present invention is installed on the wall W or beam B as shown in FIGS. 5 and 6, the air from the outside O and the inside I flows from the ventilation hole 5 of the cover plate 4 to the inner cylinder 2. In order to flow into the ventilation chamber 6 through the through hole 1 provided in the peripheral wall of the inner cylindrical body 2, it can be exchanged freely and smoothly to completely fulfill the role of ventilation, and the interior
The living atmosphere of the building will not be deteriorated.

Generally, there are three types of silencing methods: interference silencing, expansion silencing, and resonance silencing.

Interferometric silencing is a method of reducing sound by applying sound interference by dividing the paths of sound waves, changing the path difference between each, shifting the phase of the sound waves passing through each, and merging them. Expansion silencing This method creates a structure that expands the sound wave passage and contracts it again, and uses sound wave reflection at discontinuous sections of the cross-sectional area to prevent sound propagation. When a neck is provided and combined with a cavity, the neck has mass,
In this method, the cavity acts as a spring, causing a kind of resonance effect, and absorbing sound energy through resonance absorption.

The device of the present invention aims to obtain a synergistic effect by combining the above-mentioned three types of silencing methods: the interference type silencing method, the expansion type silencing method, and the resonance type silencing method. When in use, both the noise from outside and the sound from the piano and stereo emitted from inside the door enter the inner cylinder 2 through the ventilation hole 5 of the cover plate 4, but there is a partition wall inside the inner cylinder 2. 3, it does not directly lead out to the opposite side, but enters the ventilation chamber 6 through the through hole 1 of the inner cylinder 2, and then passes through the through hole 1 again to the inner cylinder 2 and the ventilation hole 5 of the cover plate 4. The path leading to indoor I or outdoor O is followed.

However, since the vent hole 5 of the cover plate 4 acts as a neck in the resonance type muffling method, and the inside of the inner cylinder body 2 acts as a cavity, the energy of the sound wave is absorbed, and furthermore, the inner cylinder body 2 acts as a cavity. The sound waves that have entered are prevented from being directly directed to the opposite side by the partition wall 3, and are passed through the through hole 1 provided in the peripheral wall of the inner cylindrical body 2 to the ventilation chamber 6.
Furthermore, when the sound waves pass through the through hole 1, they are divided and the path difference of the sound waves is changed by passing through the inner cylinder body 2 → the ventilation chamber 6 → the inner cylinder body 2, so the interference type muffling method is used. Similarly, the interference of sound waves takes place, and in addition, when the sound waves enter the ventilation chamber 6 of the outer cylinder body 7 from the inner cylinder body 2, the passage of the sound waves is expanded, and the propagation is reduced as in the expansion type muffling method. prevented,
Sound waves are greatly attenuated.

In addition to the synergistic effect of sound reduction by the three types of noise reduction methods mentioned above, the sound waves that enter the ventilation chamber 6 from the inner cylinder 2 through the through hole 1 are absorbed by the flexible sound absorbing material installed on the inner surface of the outer cylinder 7. Since the energy is absorbed and reduced by the layer 8, the sound attenuation effect is further enhanced, and the transmission of sound waves between the outdoor area O and the indoor area 2 becomes extremely small and weak.

Therefore, the noise from outside O hardly intrudes into the inside room ■, and the noise from outside room I
The sound emitted from the outside does not propagate to the outside O, so that a comfortable living atmosphere inside the room can be ensured, and at the same time, it does not disturb the residents near the outside O.

When we conducted an experiment using the device of this invention, we found that there was a reduction effect of about 5 phons on average, although there was a slight difference depending on the frequency of the sound waves, but even with 5 phons, there was no perceptual effect. was large, and the silencing effect was noticeable to humans.

The illustrated usage example of the device of the present invention is a wall W of a building,
and beam B, but are not limited to this, and include windows,
It can be installed at any necessary location on a building, such as a door, or it can also be installed on a building as a shielding plate by attaching the device of the present invention to another board and covering that board. It is possible to obtain the same effects as shown and explained above regardless of the usage condition or attachment location.

Furthermore, two or more of the devices of the present invention can be used side by side if the required amount of ventilation is large in a building.

As described above, although the device of the present invention ensures free and smooth air circulation, the propagation of sound from the air flow path is attenuated and prevented, resulting in extremely improved livability. At the same time, it does not damage the environment for nearby residents and has many practical effects, such as eliminating pollution.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the device of the present invention, FIG. 2 is a side view of the same device, FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 5th cross-sectional view along the line B-B in the direction of the arrow
The figure is a cross-sectional view showing the above device being used while being attached to a wall of a building, and FIG. 6 is a sectional view showing the above device being used being attached to a beam of a building. 1...Through hole, 2...Inner cylinder, 3...
...Partition wall, 4...Lid plate, 5...Vent hole, 6...Vent chamber, 7...Outer cylinder body, 8
...Sound absorbing layer, 9...Attachment part, W...
...Wall, 10...Mounting hole, ■...Indoor, O...Outdoor, 11...Decorative edge board,
12...Screw, B...Beam, 13...
...Drainage hole, 14...Rain shield elbow.

Claims (1)

[Scope of utility model registration request] A partition wall is provided inside the inner cylindrical body with perforations dotted in the peripheral wall so as to be located approximately halfway from both ends, and a partition wall is provided inside the outer cylindrical body so that a ventilation chamber is formed around the outer periphery of the inner cylindrical body. The outer cylindrical body and the inner cylindrical body are connected to each other by attachment portions at both ends, and a cover plate is fixed to the end of the inner cylindrical body, and the cover plates at both ends each have a passage that communicates with the inner cylindrical body. A noise-reducing ventilation device for buildings constructed by forming pores.