JP2009243113A - Sound absorbing structure of ventilation hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorbing structure of a ventilation hole from which a sound absorbing material is easily removed and which is usable for a long period of time without impairing sound absorbing properties and ventilating properties and manufacturable at low cost. <P>SOLUTION: The sound absorbing material for the ventilation hole is formed of a flexible soft foam body having open cells. The sound absorbing structure is formed cylindrical and has flexibility. Especially, the sound absorbing structure uses a sound absorbing material which is formed of a polyether soft polyurethane foam material with a permeability of 5-150 ml/cm<SP>2</SP>/s and washable. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a sound absorption structure of a ventilation hole composed of a ventilation hole connecting two or more spaces and a sound absorption material for a ventilation hole inserted into the ventilation hole, and is particularly installed on an outer wall portion for ventilating air in a building. The sound absorption structure of the ventilation hole.

Conventionally, in order to improve the air environment inside a residence or other building, various building structures and ventilation facilities that secure a necessary ventilation amount have been proposed. In particular, in recent years, “sick house syndrome” in which volatile components contained in building materials and adhesives affect the human body has become a social problem, and there is a demand for improved ventilation capacity. The structure it has is being adopted.

On the other hand, the presence of a ventilation hole is not preferable for maintaining the sound environment in the house. That is, noise generated from a main road, a railroad, or the like enters through the ventilation hole, which causes deterioration of the sound environment in the room. Conventionally, it is only necessary to close the shutter of the ventilation hole, but at the present time when ventilation is always required for 24 hours, the shutter cannot be closed.

Therefore, various methods for imparting soundproof performance to the ventilation holes have been proposed. For example, Patent Document 1 discloses a structure of a ventilation hole having a silencer on the inner surface of an outdoor hood. Patent Document 2 discloses a sound absorption structure for a ventilation hole in which a silencer having a high frequency silencer and a low frequency silencer in a housing having a specific structure is inserted into the ventilation hole. Furthermore, an active silencer as disclosed in Patent Document 3 is also disclosed.

However, the method of installing the sound deadening material on the inner surface of the outdoor hood forms a large sound deadening chamber in the hood, so that the hood is naturally larger than the normal one. Therefore, there is a problem that the silencer cannot be attached when it is not preferable to provide a large hood on the wall surface or when the width of the wall provided with the ventilation hole is small. In addition, the method of inserting a silencer having a high-frequency silencer and a low-frequency silencer in a housing having a specific structure into the ventilation hole causes clogging due to dust, dust, etc. entering through the ventilation hole, resulting in performance degradation. In addition, it is not easy to maintain the performance degradation, and it is not easy to insert and remove the silencer. Furthermore, a device with an extremely complicated configuration such as an active silencer is not suitable for ordinary houses, condominiums, and the like.
JP 2001-289472 A JP 2003-130410 A Japanese Utility Model Publication No. 5-64897

  In view of the above problems, in the sound absorption structure of the ventilation hole, the present invention can obtain sound absorption performance without being influenced by the structure of the outer wall, and in addition to the easy insertion and removal of the sound absorbing material, Providing sound absorption structure of ventilation holes with excellent maintenance performance.

According to the present invention, the following inventions 1 to 6 are provided.
A sound absorption structure of a ventilation hole comprising a ventilation hole connecting a space of 1.2 or more and a sound absorption material for a ventilation hole inserted into the ventilation hole, wherein the sound absorption material for the ventilation hole is a flexible material having open cells. A sound absorbing structure for a ventilation hole, which is made of foam and is detachably held in the ventilation hole.
2. 2. The sound absorbing structure for a ventilation hole according to 1 above, wherein the sound absorbing material for the ventilation hole is a flexible polyurethane foam.
3. 3. The sound absorbing structure for ventilation holes according to 2 above, wherein the flexible polyurethane foam is a polyether urethane foam. 4. The sound absorbing structure for a ventilation hole according to any one of the above 1 to 3, wherein the sound absorbing material for the ventilation hole has a gas permeability of 10 to 70 ml / cm ² / s.
5. The sound absorbing structure for a ventilation hole according to any one of the above 1 to 4, wherein the sound absorbing material for the ventilation hole is cylindrical.

  The sound absorption structure of the ventilation hole according to the present invention makes it easy to insert and remove the sound absorbing material because a flexible continuous foam such as a flexible polyurethane foam is detachably held in the ventilation hole using its elastic force. It is. In addition, since flexible polyurethane foam, particularly polyether-based flexible polyurethane foam, can be cleaned, maintenance is easy, it can be used repeatedly, and a comfortable indoor sound environment can be maintained.

  The sound absorption structure of the ventilation hole according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a sound absorption structure of a ventilation hole according to the present invention. As shown in this figure, a flexible foam 1 having open cells is removably held in a ventilation hole 7 penetrating an outer wall 4 of a building. Note that there are many structures in which a sleeve is fitted inside the ventilation hole. However, even if the flexible foam is attached to and detached from the ventilation hole via other members such as the sleeve, It shall be included in the invention. In FIG. 1, a register (air volume adjusting device) 8 is attached on the indoor side, and a hood 9 is installed on the outdoor side.

It is preferable that the flexible foam 1 in FIG. 1 is detachably held in the ventilation hole using its elastic force. That is, by using a flexible foam slightly larger in diameter than the inside diameter of the ventilation hole and inserting it into the ventilation hole while being slightly bent, it is held in the ventilation hole by the repulsive elastic force of the flexible foam. It is. By using this repulsive elastic force, it can be attached or removed from the ventilation hole very easily. With such a mounting method, it is only necessary to remove the resistor and insert the flexible foam into the ventilation hole, so that it does not rely on a specialist.

  The sound absorbing material 1 for ventilation holes held in the ventilation holes 7 is used for a long time. If it is a normal sound-absorbing material, dust or dust adheres depending on the period of use and air permeability is impaired. Therefore, the sound absorbing material 1 for ventilation holes of the present invention is made of a soft foam having open cells, and is fixed using elastic force as described above. Therefore, the sound absorbing material 1 for ventilation holes can be easily removed by removing the resistor 4. It can be removed and further washed. By cleaning, the attached dust or dust can be removed and used again. In such a case, even if the air permeability is impaired by long-term use, the lost air permeability can be obtained without affecting the sound absorption by washing. In addition, no specialized tools are required for maintenance, and anyone can easily perform them. Note that it is not necessary to hold the sound absorbing material in the entire ventilation hole, and the length of the sound absorbing material may be set as appropriate according to the length of the ventilation hole. The length of the sound absorbing material is preferably 50 to 200 mm, particularly 70 to 180 mm in view of ease of attachment and removal and sound absorbing performance.

FIG. 2 is a perspective view showing an example of the sound absorbing material for ventilation holes of the present invention. The flexible foam 1 has a cylindrical structure made of a polyether-based flexible polyurethane foam, and has an uneven portion 1A and a hollow portion 1B at one end. The flexible foam 1 preferably has a cylindrical shape having a hollow portion as shown in FIG. In the present invention, a flexible foam made of open cells is used. However, in consideration of sound absorption performance, it is preferable to use a continuous foam having low air permeability. A cylindrical shape like this is preferred. In addition, since it is very difficult to cut a flexible polyurethane foam into a hollow shape, it may be cylindrical when mounted, and even if it has a cutting line for extracting a hollow portion in a part of the cylindrical shape good. Furthermore, it is preferable to provide the concavo-convex portion 1 </ b> A at one end, particularly at the end located on the outdoor side. This is because the concave and convex portion 1A makes it easy to insert the sleeve into the sleeve by making the tip thin. In addition, it is good also as not only an unevenness | corrugation but a simple tip taper shape.

The air permeability of the sound absorbing material for ventilation is preferably 5 to 150 ml / cm ² / s. This is because if the air permeability is less than 5 ml / cm ² / s, the air permeability is too low and the amount of air necessary for the ventilation hole is reduced. If it exceeds 100 ml / cm ² / s, This is because the sound absorption performance is lowered. Most preferably, it is 10-70 ml / cm < ² > / s. The sound absorption is measured using JIS K 6400-7: 2004 (Method B).

The sound absorbing material for ventilation holes of the present invention uses a flexible foam having open cells, specifically, a flexible polyurethane foam, a melamine foam, a cellulosic foam or the like.

The sound absorbing material for the ventilation hole is preferably a flexible polyurethane foam. The flexible polyurethane foam is a urethane foam raw material composition containing at least an additive such as a polyol component, a polyisocyanate component and a foaming agent, and if necessary, a foam stabilizer, a catalyst, a crosslinking agent, an antioxidant, an ultraviolet absorber, and a colorant. It can be obtained by reaction and foaming by a known production method such as a one-shot method or a molding method. For example, in the one-shot method, each component is simultaneously added to the mixing chamber and simultaneously mixed by vigorous stirring to produce a polyurethane foam. The obtained polyurethane foam is processed into a desired sound absorbing material shape such as a tubular shape by cutting or the like.

The flexible polyurethane foam is roughly classified into, for example, a polyester urethane foam, a polyether urethane foam, and a polyester ether urethane foam depending on the kind of the polyol component that is a main raw material, and any polyurethane foam may be used in the present invention. In view of cleaning and repeated use of the ventilation hole sound absorbing material in the present invention, polyester ether urethane foam and polyether urethane foam are preferable, and polyether polyurethane foam is particularly preferable.

Polyether urethane foam has lower hydrolysis performance than polyester type, has excellent production stability, and can stably produce a wide range of foams. As the sound absorbing material for ventilation holes of the present invention, a material having a density of about 13 to 40 kg / m ³ is preferably employed. In addition, the number of cells of the polyether urethane foam is preferably 25 to 60 from the viewpoint of ease of control and air permeability. The hardness is preferably 80N to 150N from the viewpoint of ease of attachment and removal. The density is described in JIS K 7222, the number of cells is described in JIS K 6400-1: 2004 (Appendix 1), and the hardness is described in JIS K 6400-2: 2004 (Method D). Measured by the method.

As the polyether polyol used for the production of the polyether urethane foam, a compound having two or more active hydrogen atoms in one molecule as an initiator and an alkylene oxide added thereto can be used. . Examples of the compound having two or more active hydrogen atoms used herein include ethylene glycol, propylene glycol, glycerin, trimethylolpropane, triethanolamine, pentaerythritol, sorbitol, sucrose, and the like. Examples of the alkylene oxide include ethylene oxide and propylene oxide.

The polyester ether polyol used for the production of the polyester ether urethane foam includes dehydration condensation of a half ester produced by reacting the polyether polyol with a dicarboxylic anhydride such as phthalic anhydride, and a basic catalyst or the like to the half ester. And the like obtained by adding an epoxide in the presence of.

The above-mentioned polyester urethane foam, polyether urethane foam and polyester ether urethane foam are commercially available. For example, “Clara Foam” (manufactured by Kurashiki Textile Co., Ltd.) can be used.

(Experimental example 1)
The sound absorbing performance of the present invention is measured using a noise measuring device. In the noise measuring apparatus, a sleeve having a diameter of 100 mm and a length of 200 mm is provided in a box made of a rectangular parallelepiped having a length and width of 400 mm and a height of 600 mm. In the experiment, white noise is generated from a speaker installed in the box, and a measuring device outside the box is provided at a position 200 mm from the tip of the sleeve to measure the amount of noise generated from the inside of the box.

  First, white noise is generated from a speaker installed in the noise generating device in a hollow state without installing a sound absorbing material in the sleeve. At this time, the measured amount of noise was 57 dB.

Subsequently, the sound absorbing material for ventilation holes of the present invention is inserted into the sleeve, and the amount of noise is measured. The sound absorbing material to be used is a polyether polyurethane foam having an air flow rate of 20 ml / cm ² / s, a density of 21 kg / m ³ , a hardness of 105 N, and a cell count of 40. The shape is a cylinder having a diameter of 103 mm, a length of 80 mm, and a hollow part diameter of 50 mm. The above sound-absorbing material is inserted into the sleeve from the outside of the box and held by the repulsive force of the urethane foam. After insertion, white noise is generated from the speaker installed in the noise generator. The measured value of the noise level at this time was 47 dB. The amount of noise was reduced by 10 dB, and good sound absorption performance was shown.

Subsequently, the polyether polyurethane foam was hand-washed with a commercially available laundry detergent for 5 minutes. After washing, it was thoroughly dried and the amount of noise was measured as described above. The amount of noise at this time was 50 dB. Even after washing, the sound absorption performance was good.

(Experimental example 2)
The sound-absorbing material used was a polyether polyurethane foam having an air flow rate of 10 ml / cm ² / s, a density of 30 kg / m ³ , a hardness of 140 N, and a number of cells of 45. The shape is a cylindrical shape with a diameter of 103 mm, a length of 80 mm, and a hollow part diameter of 50 mm, and an uneven part with a height of 30 mm is given to the end located inside the box. The above sound-absorbing material is inserted into the sleeve from the outside of the box and held by the repulsive force of the urethane foam. After insertion, white noise is generated from the speaker installed in the noise generator. At this time, the measured amount of noise was 49 dB. The amount of noise was reduced by 8 dB, and good sound absorption performance was shown.

Subsequently, the polyether polyurethane foam was hand-washed with a commercially available laundry detergent for 5 minutes. After washing, it was thoroughly dried and the amount of noise was measured as described above. The amount of noise at this time was 51 dB. Even after washing, the sound absorption performance was good.

  The sound absorbing material for a ventilation hole and the sound absorbing structure of the ventilation hole using the same according to the present invention can be used for a ventilation hole that connects two or more spaces such as an outer wall of a house.

Schematic sectional view showing the structure of a ventilation hole using the sound absorbing material of the present invention Schematic perspective view showing the sound absorbing material of the present invention

Explanation of symbols

1 Sound-absorbing material 2 Ventilation hole 3 Outer wall 4 Register 5 Hood 1A Concavity and convexity 1B

Claims (5)

A sound absorption structure of a ventilation hole comprising a ventilation hole connecting two or more spaces and a sound absorption material for ventilation hole inserted into the ventilation hole, wherein the sound absorption material for ventilation hole is a flexible foam having open cells A sound absorbing structure for a ventilation hole, characterized in that it is detachably held in the ventilation hole.   The sound absorbing structure for a ventilation hole according to claim 1, wherein the flexible foam having open cells is a flexible polyurethane foam.   The sound absorbing structure for a ventilation hole according to claim 2, wherein the flexible polyurethane foam is a polyether urethane foam. The sound absorption structure for a ventilation hole according to any one of claims 1 to 3, wherein the ventilation material has a breathability of 10 to 70 ml / cm ² / s. The sound absorption structure for a ventilation hole according to any one of claims 1 to 4, wherein the sound absorption material for a ventilation hole is cylindrical.

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