JP4220364B2 - Ventilation system - Google Patents

Description

  The present invention relates to a ventilation system that achieves sound insulation of a ventilation duct.

In general, a ventilation device (class 3 ventilation) that ventilates the indoor air of a building is provided with a ventilation passage (supply port) connected to multiple outside air to take in outside air, and a ventilation fan is installed separately from this ventilation fan. Is used to exhaust the air.
When building houses, etc., when there are main roads or factories nearby, increase the airtightness of the sash, make double sashes, take sound insulation measures according to the noise level, and reduce the sound environment in the house We are trying to improve. However, since sound also enters from the air supply port for ventilating the house, it is necessary to install a silencer at the ventilation port and take measures against noise. Conversely, if the noise source is indoors, such as in a karaoke room or a factory, it is necessary to install a silencer so that sound does not leak outside through the ventilation opening.
In recent years, with the trend of airtightness and thermal insulation of houses, in order to prevent noise from the ventilator, the ventilator has a synthetic resin foam such as rubber foam, polystyrene foam and polyurethane foam, glass wool, rock wool, etc. Inorganic sound absorbing material is used.
As a technique related to a ventilation system having such a soundproofing effect, a technique described in Japanese Patent Laid-Open No. 5-302369 is known.
JP-A-5-302369

However, in the ventilator provided with the above-described silencer, the silencer obstructs the ventilation air volume, and at the same time, frequent filter replacement is necessary to maintain the function. Moreover, when trying to obtain a predetermined ventilation amount, there was a problem that the diameter of the ventilation port had to be increased.
On the other hand, in a duct in which an air conditioner and a ventilation duct communicate with each other, noise generated by the fan is reflected in the ventilation duct while propagating from one end to the other end of the ventilation duct, and some frequency components cause resonance and are amplified. Therefore, when the air is blown through the ventilation duct, there is a problem that an increase in noise due to resonance inside the ventilation duct must be suppressed and a noise level transmitted to the room must be reduced.
In recent years, devices that mute by generating sound waves that cancel the sound of the sound source, such as active mute, are known, but in addition to sound wave generators such as speakers and sensors, various devices are required, and ventilation of houses There is a problem that it is expensive and expensive to use for the mouth.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to arrange a porous body having parallel pipes in a ventilation duct, thereby preventing a wide range of noise. Another object of the present invention is to provide a ventilation system that can exhibit a high noise reduction effect, has low ventilation resistance, does not require electronic control, and is easy to install.

  As a means for achieving the above object, in the ventilation system according to claim 1 of the present invention, in the ventilation system provided with an air passage duct disposed through the wall of the building, the pipes are arranged in parallel and porous. The porous body is arranged in at least a part of the duct, and noise propagating through the duct together with air is attenuated by passing through the porous body to obtain a sound insulation effect.

  In the ventilation system according to claim 2, in the ventilation system according to claim 1, torsion is formed in the front-rear direction of the main body of the porous body, and each pipe is curved.

  In the ventilation system according to claim 3, in the ventilation system according to claim 1 or 2, the porous body is inserted and arranged from either side of the air suction port or the discharge port, and the porous body can be taken out at the time of maintenance. .

  In the ventilation system according to claim 4, in the ventilation system according to any one of claims 1 to 3, the porous body is made of a flexible material, and the torsion angle can be adjusted at the time of construction so that the porous body can be mounted.

In the ventilation system according to claim 1, since the porous body in which the pipes are arranged in parallel is arranged in at least a part of the duct, the noise propagating in the duct can be attenuated by the porous body to obtain a sound insulation effect. .
In addition, it can be installed in a limited space such as a ventilation hole, can exhibit a high silencing effect against both high-frequency noise and low-frequency noise from highways and railways, has low ventilation resistance, electronic control, etc. The installation work is easy.

  In the ventilation system according to claim 2, since the torsion is formed in the front-rear direction of the main body of the porous body and each pipe is curved, the noise propagating in the duct is effectively attenuated by the curved pipe. A sound insulation effect can be obtained.

  In the ventilation system according to the third aspect, since the porous body is inserted and arranged from either the air suction port or the discharge port, the porous body can be taken out and cleaned during maintenance.

  In the ventilation system according to claim 4, since the porous body is made of a flexible material and can be mounted by adjusting the torsion angle at the time of construction, the performance can be improved depending on the wall thickness and noise state. The best twist angle can be adjusted.

  Hereinafter, the best mode for carrying out the present invention will be described.

The ventilation system of the present invention is a system applied to a ventilation duct in a house or a building. The porous body 5 shown in FIG. 2 is arranged in the duct 2, and the noise is shunted by diverting the noise by diverting the air. It is the structure to do.
As shown in FIG. 1, the ventilation system of the present invention is connected to a duct 2 disposed through a building wall 1, a porous body 5 inserted and installed in the duct 2, and a duct 2 on the indoor side. The hood 3, the fan arranged in the hood 3, and the exhaust air guide plate 4 arranged outside the building are the main components.
Indoor air is sucked by a fan in the hood 3, passes through the duct 2, is guided to the guide plate 4, and is exhausted and ventilated upward.

The duct 2 is a ventilation hole that communicates the inside and outside of the building and exhausts air to the outside. The size and shape of the duct 2 are determined by the use of the duct, the installation site, etc. In this embodiment, A cylindrical duct having a length of about 1 m (actually applicable to about 30 cm) and a diameter of several tens of cm is used.
A porous body 5 is inscribed in the inner periphery of the duct 2, and the outer shape of the porous body 5 is formed in a cylindrical shape, and the outer dimensions are determined so as to be in close contact with the inner periphery of the duct 2.

As shown in FIG. 2, the porous body 5 is composed of a cylindrical main body that fits in the inner periphery of the duct 2 and a plurality of pipes 6 perforated in the main body, and the plurality of pipes 6 have the same diameter and the same length. The pipes are gathered together at a predetermined interval.
The main body of the porous body 5 is formed of a flexible resinous soft material, and a twist is formed from the upstream side to the downstream side of the air flow, that is, in the front-rear direction.
The porous body 5 is manufactured by drilling a circular hole (pipe 6) in a cylindrical resin main body parallel to the central axis of the cylinder (Fig. 2a), and extending the hole in the front-rear direction of the main body. The torsion is formed (Fig. 2B), and the pipes inside are curved.
In this embodiment, the torsion angle of the porous body is such that the front and rear ends are rotated by 180 degrees, and the internal pipe is gradually curved according to the torsion angle (FIG. 2C).
By disposing the porous body 5 on at least one of the suction side and the discharge side of the ventilation duct 2, resonance noise passing through the duct or vibration to be amplified is attenuated when passing through the pipe.

As a method of forming a twist in the porous body 5, a method may be used in which the resin body is softened by heating, and then cooled and cured at room temperature after being twisted. It is also possible to form the resin body from a foamable flexible resin, which is a flexible material at room temperature, and torsion at the time of mounting on the duct.
As described above, by twisting the porous body 5 at the time of mounting on the duct 2, it is possible to select and install the best twist angle in terms of performance.

  An outer end is connected to the guide plate 4 outside the discharge port of the porous body 5. Therefore, by pulling the guide plate 4 during maintenance, the porous body 5 can be pulled out from the duct 2 and taken out.

Next, the operation of this embodiment will be described.
The porous body 5 is installed in the duct 2 in accordance with the noise condition around the building or the noise generated from the room. The porous body 5 can be disposed along the entire length of the duct, but the porous body may be inserted into one end of the air supply port or the exhaust port of the duct 2.
When the porous body 5 is mounted, the best combination of the pipe size, the number of pipes, and the torsion angle of the main body is selected according to the ambient noise.
By installing the porous body 5, when the noise passes through the porous body 5, the curved pipe 6 attenuates the noise and performs sound insulation.
In addition, some frequencies are amplified by causing resonance, but the resonance is cut off when passing through the pipe 6 to prevent amplification. Therefore, a sound insulation effect can be obtained without installing a filter or a silencer.
Dust, dust, etc. accumulate on the porous pipe 6 with use. At that time, the porous body can be taken out from the duct and cleaned. Therefore, the efficiency at the time of maintenance is achieved.

As mentioned above, although the Example of this invention was described, a concrete structure is not limited to the said Example, Even if there is a design change etc. of the range which does not deviate from the summary of invention, it is contained in this invention.
For example, the porous body 5 described in the above embodiment can be configured by combining a plurality of independent pipes in parallel.
Further, the shape of the pipe 6 described in the above embodiment is not limited to a circle, and an ellipse or other square shape may be employed.

It is a schematic side view of the ventilation system of this invention. It is explanatory drawing which shows the manufacturing method of a porous body.

Explanation of symbols

1 wall
2 Duct 3 Hood 4 Guide plate 5 Porous body 6 Pipe

Claims (4)

In a ventilation system with a duct for air passage arranged through the wall of the building,
Pipes are arranged in parallel to form a porous body, and the porous body is disposed at least in a part of the duct,
A ventilation system characterized in that noise propagating in a duct together with air is attenuated by passing through a porous body to obtain a sound insulation effect.   The ventilation system according to claim 1, wherein a twist is formed in the front-rear direction of the main body of the porous body, and each pipe is curved.   The ventilation system according to claim 1 or 2, wherein the porous body is inserted and arranged from either the air suction port or the discharge port, and the porous body can be taken out during maintenance.   The ventilation system according to any one of claims 1 to 3, wherein the porous body is formed of a flexible material and can be mounted by adjusting a twist angle at the time of construction.

Images