JPH1163601A - Ventilator having sound absorbing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a working efficiency and a sound absorption ability, by using a sound absorption board made of a porous concrete material in which a reinforcing material is embedded as a sound absorption plate which forms at least a bottom surface and an air flow passage of a ventilator in the vertical type ventilator in which the air flow passage is formed by the sound absorption plate. SOLUTION: A vertical type ventilator 1 installed on a roof 11 of a building is formed by a sound absorption plate 2 made of a porous concrete material in which a reinforcing material 3 is embedded and a sound absorption plate 2a for a bottom surface and a sound absorption plate 2b for an outer wall constitute a box-shaped body. Sound absorption plates 2c for an air flow passage are mounted in the inside of the ventilator 1 in an inclined manner. The sound absorption plates 2a, 2b are assembled into a sheet of sound absorption plate 2 using L-shaped steel members, 4 and the sound absorption plates 1c are mounted by a mounting steel members 5 such that two sound absorption plates 1c intersect each other thus forming an air flow passage 6. Between the sound absorption plates 2a, 2b, a gap is defined by a longitudinal member 7 so as to form an air inlet 8, a dome is mounted on a ceiling portion of the ventilator 1, and an air outlet is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator having a sound absorbing function for ventilating air in a factory, tower parking, subway or the like while reducing noise leakage to the outside.

[0002]

2. Description of the Related Art As a ventilator having a sound absorbing function for ventilating indoor air while reducing noise leakage to the outside, a vertical ventilator 20 conventionally mounted on a building roof as shown in FIG. Alternatively, there is a horizontal ventilation device 21 attached to the side of the building as shown in FIG. 9, and the fiber-based sound absorbing material 22 of glass wool or rock wool has been used for these ventilation devices. Further, as the fiber-based sound absorbing material 22, a porous gap 23 is used as shown in FIG. 8 or FIG.

[0003] Ventilation devices 20, 21 using these fiber-based sound absorbing materials 22 and porous concrete sound absorbing materials 23.
6 to 10, a reinforcing steel plate 24 such as a large iron plate is used for the following reasons, as shown in FIGS. That is, since the fiber-based sound absorbing material 22 is flexible, the sound absorbing plate of the ventilation devices 20 and 21 cannot be constituted by itself, and the sound absorbing material 23 made of a porous concrete material is fragile, so that the sound absorbing plate is large. Therefore, a large number of small sound absorbing plates 23 made of a porous concrete material are attached to a large reinforcing steel plate 24.

[0004] The reinforcing steel plate 24 is provided with a vertical ventilation device 2.
0 is formed around the outer wall when the outer wall is formed,
In the case of the sound absorbing plate 25c that forms the air flow passage 6, it has been used as a reinforcing plate for attaching a large number of small sound absorbing plates 23 to both surfaces. In the vertical ventilation device 20,
When assembling it on the building roof 11 or during periodic cleaning, an operator often rides on the bottom plate to assemble or clean the sound absorbing plate for the air flow passage or the outer wall. Accordingly, a thick and durable reinforcing steel plate 24 is also laid on the lower surface of the bottom plate for the purpose of reinforcing the bottom plate, and a fiber-based sound absorbing material 22 and a small sound absorbing material 23 of a porous concrete material are adhered thereon. Can be

[0005] In the horizontal (tubular) ventilation device 21 shown in Figs.
A thick and durable reinforcing steel plate is provided on the lower surface of the sound absorbing plate 25a on the bottom surface, also serving as a scaffold for a worker to work on the sound absorbing plate 25a on the bottom surface when assembling or performing periodic cleaning. 24 are often laid.

[0006]

However, the structure in which the steel plate 24 is assembled and the sound absorbing members 22 and 23 are further adhered to both sides of the steel plate 24 requires time and effort to handle the heavy steel plate 24. Further, in the case of the vertical ventilation device 20, the sticking of the sound absorbing materials 22, 23 to the indoor surface of the sound absorbing plate 25a on the bottom surface is usually omitted because of the poor workability of the ventilation device. Therefore, the steel plate 24 was exposed on this surface, and no sound absorbing performance was obtained. Further, since the steel plate 24 reflects sound inside the sound absorbing plate, the thickness of the sound absorbing plate 25 was sufficiently utilized, and particularly, the sound absorbing performance in a low frequency range could not be provided.

Further, since the steel plate 24 is used, there is a problem that water droplets fall due to dew condensation generated on the surface of the steel plate 24 due to a temperature difference between the outside air and the room. Therefore, an object of the present invention is to omit a steel plate to eliminate problems such as handleability and dew condensation, to improve construction efficiency and sound absorption performance, and to have a sound absorption function that enables further weight reduction and cost reduction. It is intended to provide a ventilation device.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has an air intake / exhaust port attached to a building roof and having an air intake / exhaust opening indoors and on the roof, and an air flow passage formed by a sound absorbing plate inside. In a vertical ventilation device having a sound absorbing function of a formed casing, a sound absorbing plate forming an air flow passage with at least a bottom surface of the ventilation device is a sound absorbing plate made of a porous concrete material in which a reinforcing material is embedded. The ventilation device having a sound absorbing function is characterized in that:

According to a second aspect of the present invention, there is provided a cylindrical shape which is attached to the side of a building and has air intake / exhaust ports opened indoors and outdoors, and an air flow passage formed by a sound absorbing plate inside. In a horizontal ventilation device having a sound absorbing function of a body, a sound absorbing plate forming an air flow passage with at least a bottom surface of the ventilation device is a sound absorbing plate made of a porous concrete material in which a reinforcing material is embedded. A ventilation device having a sound absorbing function was configured.

The operation of the present invention will be described below. In the sound-absorbing plate according to the present invention, since a reinforcing material such as a reinforcing bar is embedded in the sound-absorbing plate made of a porous concrete material, the bending strength of the sound-absorbing plate becomes extremely large, and the size can be increased. Therefore, when this sound absorbing plate is used as a sound absorbing plate for forming an air flow passage inside the ventilation device, it is possible to assemble the sound absorbing plate using only the L-shaped steel material without requiring a thick and wide steel plate for reinforcement. Furthermore, if the outer wall of the entire ventilation device is configured by using the sound absorbing plate, the steel plate conventionally provided on the outer wall surface can be eliminated.

[0011] In addition, since the reinforcing material is embedded in the sound absorbing plate on the bottom surface of the vertical or horizontal ventilation device,
A sufficient strength can be obtained so that even if a person rides on the bottom surface, a steel plate for reinforcing the bottom surface as in the related art is not required. And
By eliminating the heavy steel plate for reinforcing the bottom surface, the steel plate itself is not required to be installed, and it is not necessary to attach the sound absorbing plate to the steel plate. Therefore, the workability is greatly improved and the weight can be reduced. In the case of a vertical ventilation device, the indoor surface of the bottom surface also serves as a sound absorbing surface, so that it can also serve to absorb indoor noise. Since there is no steel plate in the center of the sound absorbing plate that reflects sound even in the sound absorbing characteristics, the entire thickness of the sound absorbing plate works effectively for sound absorption in the low frequency range even with the sound absorbing plate of the same thickness as before. become.

Further, since the steel plate on the outer wall surface is eliminated and the sound absorbing plate according to the present invention has heat insulating properties, dew condensation due to a temperature difference between the inside and outside air does not occur on the surface of the ventilation device of the present invention. Further, in the vertical ventilation device, the overall weight is reduced as compared with a conventional device using glass wool as a sound absorbing material, and the burden on the roof is reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. In addition, the same code | symbol is attached | subjected to the code | symbol same as a conventional example. FIG. 1 shows a building roof 11 made of a steel plate.
FIG. 2 is a perspective view of a vertical ventilation device 1 having a sound absorbing function installed in the apparatus, and FIG. 2 is a sectional view thereof. This ventilation device 1
Is constituted by a sound absorbing plate 2 made of a porous concrete material in which a reinforcing material 3 is buried therein. The sound absorbing plate 2 is composed of a sound absorbing plate 2a for a bottom surface and a sound absorbing plate 2b for an outer wall. An airflow passage sound-absorbing plate 2c is provided inside and inclined. Further, the bottom sound absorbing plate 2a and the outer wall sound absorbing plate 2b are each assembled with only one large sound absorbing plate 2 by means of an L-shaped steel material 4, and the air flow passage sound absorbing plate 1c is formed by the mounting steel material 5. The sheets are attached so as to intersect with each other to form an air flow passage 6.

Further, a vertical steel member 7 is provided between the sound absorbing plate 2a for the bottom surface and the sound absorbing plate 2b for the outer wall to form an air inlet 8 which is open indoors. As shown in FIG. 2, a dome 9 is provided on the ceiling of the ventilation device 1, and an air outlet 10 that opens to the outside is formed.

In the above ventilating apparatus 1, the air inlet 8
Indoor air taken in from the air is discharged to the outside through the air discharge passage 10 through the air flow passage 6, and at this time, the indoor noise is generated on both sides of the bottom sound absorbing plate 2a and the air flow passage sound absorbing plate 1c, and Sound is absorbed by the inner surface of the outer wall sound absorbing plate 2b, so that air ventilation and indoor noise absorption are simultaneously achieved. In particular, since the indoor side surface of the bottom sound absorbing plate 2a directly absorbs indoor noise, the sound absorbing effect of that surface becomes remarkable.
Further, since the bottom sound absorbing plate 2a has a high strength, a worker can work on the ventilation device 1 when assembling the ventilation device 1, so that the construction efficiency is improved.

FIG. 3 is a perspective view of a horizontal ventilation device 12 having a sound absorbing function installed on a building side wall 13, and FIG. 4 is a sectional view thereof. This ventilation device 12 also has a reinforcing material 3 inside.
Are formed by a sound absorbing plate 2 made of a porous concrete material in which a sound absorbing plate 2a for a bottom surface and a sound absorbing plate 2b for an outer wall are formed. The air inlet 8 is formed on the indoor side, and the air outlet 10 is formed on the outdoor side. Further, a plurality of airflow passage sound absorbing plates 2c are arranged in the inside thereof in the vertical direction. Further, the bottom sound absorbing plate 2a and the corresponding outer wall sound absorbing plate 2b are composed of only two large sound absorbing plates, and are attached to the flange 14, the L-shaped steel member 4, and the like.
Also in the above ventilator 12, the ventilation of the air and the sound absorption of the indoor noise are simultaneously achieved similarly to the ventilator 1, and the sound absorbing plate 2a for the bottom surface has the reinforcing member 3 buried therein so that the strength is increased. Also, at the time of assembling the ventilating device 12, it is possible for the operator to work on it.

In the above embodiment, the sound absorbing plate 2 made of a porous concrete material in which the reinforcing material 3 is buried is attached to the bottom surface.
Although a more desirable ventilation device applied to all of the outer wall and the air flow passage has been described, in the present invention, the sound absorbing plate 2 is used.
The purpose is achieved only by applying to the bottom surface and the air flow passage.

The porous concrete material constituting the sound absorbing plate 2 according to the present invention is not particularly limited, but those obtained by the following two methods are suitable. One is to mix the raw slurry and the foam by the preform method of mixing the separately produced air bubbles with the raw slurry mainly composed of siliceous and calcareous materials or the mix foam method of foaming the raw material slurry to form the air bubbles. Or by bubbling a foaming material such as aluminum metal powder mixed into the raw material slurry, thereby producing a semi-cured body in which open cells are formed. And it is a porous concrete material obtained by subjecting the semi-cured body to autoclave curing in a saturated steam atmosphere of 140 ° C. or higher.

The other is a porous concrete material obtained by connecting natural or artificial fine aggregates of sub-millimeters to several millimeters with a binder such as cement. Fine aggregates include tiles, ceramic waste, glass waste, expansive shale, and the like, and water glass, cement, and the like are applied as binders.

In the case of the porous concrete material manufactured by the former method, it is more preferable that the bulk specific gravity is 0.23 to 0.5 and the open cells have 30% or more. That is, when the open cells have 30% or more, the sound absorbing performance becomes more excellent, and the bulk specific gravity is 0.23 to 0.1.
Those in the range of 5 are lightweight and have sufficient strength as a rigid body, so that they are sufficient.

As the reinforcing material 3 to be buried, a reinforcing bar, a wire net, a lath net, a bundle of carbon fibers or aramid fibers, or the like can be used. In particular, the reinforcing bar preferably has sufficient strength and is inexpensive. Further, the reinforcing member 3 is buried in the sound absorbing plate 2 in a mat shape as shown in FIG. 1, but it is more preferable that the reinforcing member 3 is formed in a cage shape (not shown) to increase the strength.

When the sound absorbing plate 2 according to the present invention is used for the outer walls of the ventilators 1 and 7, it is preferable to impregnate the surface layer with a water-repellent material, especially silicon-based dimethylpolysiloxane and methylphenylpolysiloxane. Organopolysoloxane such as siloxane and alkyl-modified polysiloxane is preferred.

Further, in the present invention, FIG.
As shown in (b), it is preferable to provide a linear or curved concavo-convex pattern on the surface of the sound absorbing plate 2 because the sound absorbing area is further increased and higher sound absorbing performance can be obtained.
Here, a peak a: 30 to 45 mm, a valley b: 20 to 30 m
m, inclined portion c: 10 to 20 mm, depth d: 15 to 30 m
m, the surface area is increased by about 40% or more as compared with a flat surface. According to the measurement method of the reverberation chamber sound absorption coefficient according to JIS A1409, the center frequency is 2
Sound absorption coefficient from 0.9 to 1.0 at 50 to 4000 Hz
To improve.

Hereinafter, the present invention will be described more specifically based on examples.

EXAMPLE A porous concrete material constituting the sound absorbing plate 2 of the present example was manufactured as follows. The raw material slurry was composed of 48 parts by weight of silica powder as a siliceous raw material, 48 parts by weight of early strength cement as a calcareous raw material, 4 parts by weight of gypsum dihydrate as a hardening control material, and 0.12 of aluminum metal powder as a foaming material for the solid content. Parts by weight and water 78
Basically, parts by weight were mixed, and a higher alcohol sulfate as a surfactant and methylcellulose as a viscosity modifier were further mixed.

The raw material slurry is poured into a formwork in which eight reinforcing rods each having a diameter of 3 mm and 29 horizontal reinforcing rods are arranged in a mesh shape so as to be located at the center in the thickness direction, and foamed. After that, cut with a piano wire to the predetermined dimensions,
Finally, it is cured in a saturated steam atmosphere at 180 ° C. for about 10 hours in an autoclave. The porous concrete material thus obtained had a bulk specific gravity of 0.40 in an air-dried state. Thus, a sound absorbing plate 2 made of a porous concrete material (thickness 50 mm, width 600 mm, length 2000 mm) mainly composed of calcium silicate was obtained. In addition, a panel in which the sound absorbing plate 2 is cut into a length of 1000 mm according to JIS
As a result of a test according to A 5416, the load was 100 kg.
/ M ² or more.

Further, as shown in FIG.
The sound absorbing plate 2b for the outer wall, the internal sound absorbing plate 2c for the cross airflow passage, and the sound absorbing plate 2a for the bottom surface are attached to the die steel member 4 with bolts, and the height is 1000 mm, the width is 1000 mm, and the height is 500 mm.
The vertical ventilation device 1 (excluding the dome 9) was manufactured. At this time, the sound absorbing plate 2 is fixed to the L-shaped steel member 4 and the mounting steel member 5 of the ventilator with bolts having a diameter of 12 mm while supporting both ends thereof. The sound absorbing plate 2 whose surface was impregnated with a silicon-based water-repellent material was used as the sound absorbing plate 2b for the outer wall exposed outdoors.

Conventionally, after the steel plate 24 is bolted to the L-shaped steel member 4 of the ventilation device, the sound absorbing members 22 and 23 are adhered and fixed on the steel member 24 with an adhesive, a screw, or the like. The simplification of the construction greatly reduced man-hours and the number of parts. Further, after the floor sound absorbing plate 2a of the ventilator was installed first, the assembling work of the internal air flow passage sound absorbing plate 2c was possible with a person riding on the bottom sound absorbing plate 2a. For the overall weight, glass wool sound absorbing material 2
The conventional ventilator 20 consisting of 2 and a steel plate 24 is 180k
g, the ventilation device 20 comprising the porous concrete material 23 and the steel plate 24 weighs 245 kg, whereas the ventilation device 1 of the present invention has a weight of 170 kg, which is the lightest.

The horizontal ventilation device 12 shown in FIGS. 3 and 4 has the same effect as that of the first embodiment, that is, the work of assembling the steel plate 24 is eliminated, and the construction efficiency can be greatly improved. The work of assembling the sound absorbing plate 2c for the air flow passage inside the vehicle on the plate 2a could be easily performed.

[0029]

According to the present invention, in a ventilation device having a sound absorbing function, a sound absorbing plate made of a porous concrete material in which a reinforcing material such as a reinforcing steel bar is embedded is applied as a sound absorbing plate. The following various effects can be obtained. That is, (1) The steel plate for reinforcing the sound absorbing plate, which has been conventionally used, becomes unnecessary, and the sound absorbing plate can be enlarged. Therefore, the work of attaching a plurality of small sound absorbing plates to the reinforcing steel plate has been performed. Therefore, the construction efficiency is remarkably improved, and the handling of the reinforcing steel plate is not required. (2) Especially when the bottom surface is assembled, the worker can perform the assembling operation on the sound absorbing plate without providing a reinforcing steel plate, and can perform the periodic cleaning on the bottom surface. (3) Further, by omitting the reinforcing steel plate on the bottom surface, the indoor sound absorbing effect is improved, and dew condensation on the surface is eliminated. (4) By eliminating thick and wide steel plate for reinforcement,
The weight of the entire ventilation device can be reduced. (5) The cost is reduced by improving the construction efficiency and omitting the reinforcing steel plate and each member. (6) In particular, when the sound absorbing plate according to the present invention is applied to the entire ventilation device, the above effects are more remarkable.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional perspective view of a vertical ventilation device according to the present invention.

FIG. 2 is a sectional view of a vertical ventilation device according to the present invention.

FIG. 3 is a partial cross-sectional perspective view of a horizontal ventilation device according to the present invention.

FIG. 4A is a cross-sectional view of a horizontal ventilation device according to the present invention. (B) A of FIG. 4 (a) of the horizontal ventilation device of the present invention
Sectional view seen from the direction. (C) B of FIG. 4 (a) of the horizontal ventilation device of the present invention
Sectional view seen from the direction.

FIG. 5 (a) is a cross-sectional view of a sound absorbing plate according to the present invention, which has an uneven pattern on its surface. (B) A front view of a sound absorbing plate according to the present invention having an uneven pattern on its surface.

FIG. 6 is a partial sectional perspective view of a conventional vertical ventilation device using glass wool.

FIG. 7 is a cross-sectional view of a conventional vertical ventilation device using glass wool.

FIG. 8 is a partial cross-sectional perspective view of a conventional vertical ventilation device using porous concrete.

FIG. 9 is a partial cross-sectional perspective view of a conventional horizontal ventilation device using glass wool.

FIG. 10 is a partial cross-sectional perspective view of a conventional vertical ventilation device using porous concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical ventilation device 2 Sound absorbing plate 2a Sound absorbing plate for bottom 2b Sound absorbing plate for outer wall 2c Sound absorbing plate for air flow passage 3 Reinforcement material 4 L-shaped steel material 5 Mounting steel material 6 Air flow passage 7 Vertical steel material 8 Air intake 9 Dome DESCRIPTION OF SYMBOLS 10 Air outlet 11 Steel plate roof 12 Horizontal ventilation device 13 Building side wall 14 Flange

Claims (3)

[Claims] 1. A vertical ventilation system having a sound-absorbing function of a housing which is attached to a building roof and has an air intake / exhaust port opened indoors and on a roof and has an air flow passage formed therein by a sound-absorbing plate. In the device, a sound absorbing plate forming an air flow passage with at least a bottom surface of the ventilating device is a sound absorbing plate made of a porous concrete material in which a reinforcing material is embedded. 2. A horizontal ventilation device having a sound absorbing function of a cylindrical body which is attached to the side of a building and has air intake / exhaust ports opened indoors and outdoors and has an air flow passage formed therein by a sound absorbing plate. The ventilation device having a sound absorbing function according to any one of claims 1 to 3, wherein a sound absorbing plate forming an air flow passage with at least a bottom surface of the ventilation device is a sound absorbing plate made of a porous concrete material in which a reinforcing material is embedded. 3. The ventilation device having a sound absorbing function according to claim 1, wherein the reinforcing member is a reinforcing bar.