JP2001041021A - Silencer for air-conditioning duct - Google Patents
Silencer for air-conditioning ductInfo
- Publication number
- JP2001041021A JP2001041021A JP11212175A JP21217599A JP2001041021A JP 2001041021 A JP2001041021 A JP 2001041021A JP 11212175 A JP11212175 A JP 11212175A JP 21217599 A JP21217599 A JP 21217599A JP 2001041021 A JP2001041021 A JP 2001041021A
- Authority
- JP
- Japan
- Prior art keywords
- sound absorbing
- absorbing material
- resonator
- air
- conditioning duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Exhaust Silencers (AREA)
- Duct Arrangements (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、空調ダクトの流
路に介在し、流路を伝わる送風機等の騒音を低減する空
調ダクト用消音器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for an air-conditioning duct which is interposed in a flow path of an air-conditioning duct and reduces noise of a blower or the like transmitted through the flow path.
【０００２】[0002]
【従来の技術】従来より、この種の消音器として、流路
の周囲や流路中に設けたグラスウール等の吸音材により
音エネルギを吸収して騒音を低減する吸音型と、流路に
付設した共鳴器や流路断面の急拡大により音波の干渉や
反射を生じさせ、これを利用して騒音を低減するリアク
タンス型とがある。2. Description of the Related Art Conventionally, as a silencer of this type, a sound absorbing type for reducing noise by absorbing sound energy by a sound absorbing material such as glass wool provided around or in the flow path, and a sound absorbing type provided in the flow path. There is a reactance type in which interference or reflection of sound waves is caused by a sudden expansion of the resonator or the cross section of the flow path, and the noise is reduced by using the interference or reflection.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、吸音型
では、高周波域の騒音は低減できるが、低周波域の騒音
は効率よく吸収できず、リアクタンス型では、低周波域
の騒音も低減できるが、大きな設置スペースを要すると
いう問題がある。However, the sound absorbing type can reduce high-frequency noise, but cannot efficiently absorb low-frequency noise, and the reactive type can also reduce low-frequency noise. There is a problem that a large installation space is required.
【０００４】そこで、この発明は、低周波域の騒音から
高周波域の騒音まで低減でき、かつコンパクトな空調ダ
クト用消音器を提供することを課題とする。Accordingly, an object of the present invention is to provide a compact silencer for an air-conditioning duct that can reduce noise in a low frequency range to noise in a high frequency range.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するた
め、この発明は、空調ダクトの流路に介在し、流路を伝
わる騒音を低減する空調ダクト用消音器において、前記
流路に吸音材を配設すると共に、吸音材の端部に共鳴器
を付設したのである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a silencer for an air-conditioning duct which is interposed in a flow path of an air-conditioning duct and reduces noise transmitted through the flow path. And a resonator is attached to the end of the sound absorbing material.
【０００６】この消音器では、高周波域の騒音は吸音材
に吸収され、低周波域の騒音は吸音材端部に設けられた
共鳴器で低減されるので、コンパクトでありながら、広
い周波数域の騒音を低減できる。In this silencer, noise in the high frequency range is absorbed by the sound absorbing material, and noise in the low frequency range is reduced by the resonator provided at the end of the sound absorbing material. Noise can be reduced.
【０００７】また、この共鳴器を流線型とし、その表面
を吸音材の表面に滑らかに連続させると、空気抵抗が少
なくなり、圧力損失が抑制される。When the resonator is of a streamline type and its surface is smoothly connected to the surface of the sound absorbing material, air resistance is reduced and pressure loss is suppressed.
【０００８】なお、前記吸音材の内部に共鳴器を埋設す
ると、吸音材の端部の共鳴器では減音量が不足する場合
にも、共鳴器の容積を充分に確保して所要の減音量を得
ることができる。When a resonator is buried inside the sound absorbing material, even when the sound volume of the resonator at the end of the sound absorbing material is insufficient, the volume of the resonator is sufficiently ensured to obtain the required sound reduction. Obtainable.
【０００９】また、前記共鳴器の共鳴口を吸音材に向け
て開口させると、共鳴口が直接気流の影響を受けること
がなく、笛吹き音などの発生が防止される。Further, when the resonance port of the resonator is opened toward the sound absorbing material, the resonance port is not directly affected by the airflow, and the occurrence of a whistling sound or the like is prevented.
【００１０】[0010]
【発明の実施の形態】この発明の第１実施形態を図１及
び図２に基づいて説明する。図示のように、この消音器
では、流路Ｌをなす四角筒型の本体１において、周壁の
対向する内面にグラスウール等の吸音材２が固着され、
吸音材２の流路Ｌへの接触面は保護材３で覆われてい
る。各吸音材２の両端部には共鳴器４が付設されてい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. As shown in the figure, in this silencer, a sound absorbing material 2 such as glass wool is fixed to the opposing inner surfaces of the peripheral wall in a rectangular cylindrical main body 1 forming a flow path L,
The contact surface of the sound absorbing material 2 with the flow path L is covered with the protective material 3. Resonators 4 are attached to both ends of each sound absorbing material 2.
【００１１】前記共鳴器４は、断面形状が扇形の筒状体
であり、その弧状の表面が流路に面し、吸音材２の表面
に滑らかに連続している。また、共鳴器４の２方の平板
状の端面のうち、一方の端面が吸音材２に密着し、この
端面には複数の共鳴口５が開口している。共鳴器４の材
料としては、金属材料、高分子材料その他の不燃材料が
用いられている。The resonator 4 is a cylindrical body having a fan-shaped cross section, and its arc-shaped surface faces the flow path and is smoothly connected to the surface of the sound absorbing material 2. One end face of the two flat end faces of the resonator 4 is in close contact with the sound absorbing material 2, and a plurality of resonance ports 5 are opened in this end face. As a material of the resonator 4, a metal material, a polymer material, and other noncombustible materials are used.
【００１２】この消音器によると、高周波域の騒音は吸
音材２に吸収され、低周波域の騒音は共鳴器４で低減さ
れるので、コンパクトでありながら、広い周波数域の騒
音を低減できる。According to this silencer, noise in the high frequency range is absorbed by the sound absorbing material 2 and noise in the low frequency range is reduced by the resonator 4, so that noise in a wide frequency range can be reduced while being compact.
【００１３】また、吸音材２の端部に位置する共鳴器４
が流線型であるので、吸音材２や共鳴器４を設けたこと
による空気抵抗の増大が少なく、圧力損失が抑制され
る。The resonator 4 located at the end of the sound absorbing material 2
Is a streamlined type, the increase in air resistance due to the provision of the sound absorbing material 2 and the resonator 4 is small, and the pressure loss is suppressed.
【００１４】さらに、共鳴口５が吸音材２に向かって開
口しているので、共鳴口５は直接気流の影響を受けるこ
とがなく、笛吹き音などの発生が防止される。Further, since the resonance port 5 is open toward the sound absorbing material 2, the resonance port 5 is not directly affected by the airflow, and generation of a whistling sound or the like is prevented.
【００１５】次に、この発明の第２実施形態を図３に基
づいて説明する。図示のように、この消音器では、流路
Ｌをなす四角筒型の本体１において、周壁の一方の内面
に、グラスウール等の吸音材２が固着され、吸音材２の
流路Ｌへの接触面は保護材３で覆われている。吸音材２
の内部には直方体状の共鳴器４が埋設され、共鳴器４に
は吸音材２に向けて開口する複数の共鳴口５が設けられ
ている。Next, a second embodiment of the present invention will be described with reference to FIG. As shown in the figure, in this silencer, a sound absorbing material 2 such as glass wool is fixed to one inner surface of a peripheral wall in a rectangular cylindrical main body 1 forming a flow path L, and the sound absorbing material 2 contacts the flow path L. The surface is covered with a protective material 3. Sound absorbing material 2
A resonator 4 having a rectangular parallelepiped shape is buried inside the resonator. The resonator 4 is provided with a plurality of resonance ports 5 opening toward the sound absorbing material 2.
【００１６】このように、吸音材２の内部に共鳴器４を
埋設すると、共鳴器４として大きなものが使用できるの
で、充分な減音量を得ることができる。When the resonator 4 is buried inside the sound absorbing material 2 as described above, a large resonator 4 can be used, so that a sufficient volume reduction can be obtained.
【００１７】次に、この発明の第３実施形態を図４に基
づいて説明する。図示のように、この消音器では、流路
Ｌをなす四角筒型の本体１において、周壁の対向する内
面に加えて、流路Ｌの中央部にも吸音材２が設けられ、
各吸音材２の流路Ｌへの接触面は保護材３で覆われてい
る。各吸音材２の両端部には扇形断面の筒状共鳴器４が
付設され、各吸音材２の内部には共鳴器４が埋設されて
いる。これら各共鳴器４の共鳴口５は吸音材２に向かっ
て開口している。Next, a third embodiment of the present invention will be described with reference to FIG. As shown in the figure, in this silencer, a sound absorbing material 2 is provided at the center of the flow path L in addition to the inner surfaces of the peripheral wall facing each other in the rectangular cylindrical main body 1 forming the flow path L,
The contact surface of each sound absorbing material 2 with the flow path L is covered with a protective material 3. A cylindrical resonator 4 having a fan-shaped cross section is attached to both ends of each sound absorbing material 2, and the resonator 4 is embedded inside each sound absorbing material 2. The resonance port 5 of each of these resonators 4 opens toward the sound absorbing material 2.
【００１８】このように、各吸音材２の両端部及び内部
に共鳴器４を設けると、吸音材２の両端部に付設した共
鳴器４だけでは減音量が不足する場合にも、吸音材２の
内部に埋設した共鳴器４により共鳴器４の容積を充分に
確保できるので、所要の減音量を得ることができる。As described above, when the resonators 4 are provided at both ends and inside of each sound absorbing material 2, even if the sound volume reduction is insufficient with only the resonators 4 provided at both ends of the sound absorbing material 2, the sound absorbing materials 2 are provided. Since the volume of the resonator 4 can be sufficiently ensured by the resonator 4 embedded in the inside, the required sound reduction can be obtained.
【００１９】次に、この発明の第４実施形態を図５に基
づいて説明する。図示のように、この消音器では、流路
Ｌをなす本体１がエルボとなっており、その周壁の内周
部及び外周部の内面に吸音材２が設けられている。各吸
音材２の流路Ｌへの接触面は保護材３で覆われており、
本体１の外周部における吸音材２と周壁との間には、共
鳴器４が設けられている。この共鳴器４の共鳴口５は吸
音材２に向かって開口している。Next, a fourth embodiment of the present invention will be described with reference to FIG. As shown in the figure, in this silencer, a main body 1 forming a flow path L is an elbow, and a sound absorbing material 2 is provided on inner surfaces of an inner peripheral portion and an outer peripheral portion of a peripheral wall thereof. The contact surface of each sound absorbing material 2 with the flow path L is covered with a protective material 3,
A resonator 4 is provided between the sound absorbing material 2 and the peripheral wall on the outer peripheral portion of the main body 1. The resonance port 5 of the resonator 4 opens toward the sound absorbing material 2.
【００２０】このように、流路Ｌが屈曲したエルボにも
吸音材２と共鳴器４を組み合わせた構成を適用して、高
周波域と低周波域の騒音を低減することができる。As described above, the structure in which the sound absorbing material 2 and the resonator 4 are combined is applied to the elbow whose flow path L is bent, so that high-frequency noise and low-frequency noise can be reduced.
【００２１】[0021]
【実施例】上記のような構造の消音器の減音試験を、図
６に示すような設備を用いて行った。この設備は、前室
１０のスピーカ１１より様々な周波数の音を発生させ、
ダクト１２を通して残響室１３に放射される音をマイク
ロフォン１４で感知し、測定装置１５により平均音圧レ
ベルを測定するものである。EXAMPLE A noise reduction test of a muffler having the above-described structure was performed using equipment as shown in FIG. This equipment generates sounds of various frequencies from the speaker 11 in the front room 10,
The sound radiated to the reverberation room 13 through the duct 12 is sensed by the microphone 14, and the average sound pressure level is measured by the measuring device 15.
【００２２】そして、試験体Ｓをダクト１２に介在させ
た場合の音圧レベルを、試験体Ｓが介在しない場合の音
圧レベルと比較し、その差を減音量とした。試験体Ｓと
しては、図７に示すような１６０Ｈｚ用のものを用い
た。また、共鳴器を装備しない従来の吸音型消音器につ
いても比較例として測定を行った。Then, the sound pressure level when the test piece S was interposed in the duct 12 was compared with the sound pressure level when the test piece S was not interposed, and the difference was regarded as a reduced sound volume. As the specimen S, a specimen for 160 Hz as shown in FIG. 7 was used. In addition, a conventional sound absorbing silencer without a resonator was also measured as a comparative example.
【００２３】ここで、共鳴器４の共鳴周波数は次式（ヘ
ルムホルツ共鳴器の式）で導かれ、波長に比べて寸法の
小さい空洞は、中の空気がばねとして働き、その空洞が
外に通じていると空気は一つの塊として運動するため、
共鳴周波数で有効な減音量を得ることができる。Here, the resonance frequency of the resonator 4 is derived by the following equation (Helmholtz resonator equation). In a cavity whose size is smaller than the wavelength, the air inside acts as a spring and the cavity communicates with the outside. The air moves as one lump,
An effective sound reduction can be obtained at the resonance frequency.
【００２４】[0024]
【数１】 (Equation 1)
【００２５】この試験結果を図８に示す。図示のよう
に、この発明に係る消音器によると、外寸は従来のもの
と変わらないコンパクトなものであっても、従来のもの
ではあまり低減できない低周波域の騒音を十分に低減す
ることができる。FIG. 8 shows the test results. As shown in the figure, according to the silencer according to the present invention, even if the external dimensions are as compact as conventional ones, it is possible to sufficiently reduce low-frequency noise that cannot be reduced so much with conventional ones. it can.
【００２６】また、減音したい周波数と、実際に減音さ
れる周波数とが異なる場合には、施工後であっても、共
鳴器４を適当な寸法のものに交換するだけで、所要の周
波数の騒音が低減されるように容易に変更することがで
きる。When the frequency to be reduced is different from the frequency to be actually reduced, the required frequency can be changed simply by replacing the resonator 4 with one having an appropriate size even after the installation. Can be easily changed so as to reduce the noise.
【００２７】[0027]
【発明の効果】以上のように、この発明に係る消音器に
よると、高周波域の騒音は吸音材に吸収され、低周波域
の騒音は吸音材端部に設けられた共鳴器で低減されるの
で、コンパクトでありながら、広い周波数域の騒音を低
減できる。As described above, according to the silencer according to the present invention, high frequency noise is absorbed by the sound absorbing material, and low frequency noise is reduced by the resonator provided at the end of the sound absorbing material. Therefore, it is possible to reduce noise in a wide frequency range while being compact.
【図１】この発明の第１実施形態の概略断面図FIG. 1 is a schematic sectional view of a first embodiment of the present invention.
【図２】同上の吸音材と共鳴器の分解斜視図FIG. 2 is an exploded perspective view of the sound absorbing material and the resonator according to the first embodiment.
【図３】この発明の第２実施形態の概略断面図FIG. 3 is a schematic sectional view of a second embodiment of the present invention.
【図４】この発明の第３実施形態の概略断面図FIG. 4 is a schematic sectional view of a third embodiment of the present invention.
【図５】この発明の第４実施形態の概略断面図FIG. 5 is a schematic sectional view of a fourth embodiment of the present invention.
【図６】試験設備を示す図FIG. 6 is a view showing a test facility.
【図７】実施例の試験体の概略断面図FIG. 7 is a schematic cross-sectional view of a test piece of an example.
【図８】試験結果を示すグラフFIG. 8 is a graph showing test results.
１ 本体 ２ 吸音材 ３ 保護材 ４ 共鳴器 ５ 共鳴口 Ｌ 流路 DESCRIPTION OF SYMBOLS 1 Main body 2 Sound absorbing material 3 Protective material 4 Resonator 5 Resonance port L Flow path
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福田 栄次 大阪市西区北堀江１丁目12番19号 株式会 社栗本鐵工所内 (72)発明者 椴木 浩行 大阪市西区北堀江１丁目12番19号 株式会 社栗本鐵工所内 (72)発明者 長谷川 智之 大阪市西区北堀江１丁目12番19号 株式会 社栗本鐵工所内 Ｆターム(参考） 3G004 AA10 CA02 CA06 CA13 DA06 FA07 3L080 AE02 5D061 EE12 EE24 EE31 ──────────────────────────────────────────────────続 き Continued on the front page (72) Eiji Fukuda 1-12-19 Kitahorie, Nishi-ku, Osaka City Inside Kurimoto Iron Works, Ltd. No. Kurimoto Iron Works, Ltd. (72) Inventor Tomoyuki Hasegawa 1-12-19 Kitahorie, Nishi-ku, Osaka-shi EE31
Claims (4)
る騒音を低減する空調ダクト用消音器において、前記流
路に吸音材を配設すると共に、吸音材の端部に共鳴器を
付設したことを特徴とする空調ダクト用消音器。1. An air-conditioning duct silencer that is interposed in a flow path of an air-conditioning duct and reduces noise transmitted through the flow path, wherein a sound absorbing material is disposed in the flow path and a resonator is provided at an end of the sound absorbing material. A silencer for an air conditioning duct, which is attached.
おいて、前記共鳴器を流線型とし、その表面を前記吸音
材の表面に滑らかに連続させたことを特徴とする空調ダ
クト用消音器。2. The muffler for an air-conditioning duct according to claim 1, wherein said resonator has a streamlined shape and its surface is smoothly connected to the surface of said sound-absorbing material.
る騒音を低減する空調ダクト用消音器において、前記流
路に吸音材を配設すると共に、吸音材の内部に共鳴器を
埋設したことを特徴とする空調ダクト用消音器。3. A muffler for an air conditioning duct interposed in a flow path of an air conditioning duct to reduce noise transmitted through the flow path, wherein a sound absorbing material is disposed in the flow path and a resonator is embedded inside the sound absorbing material. A silencer for an air-conditioning duct.
音器において、前記共鳴器の共鳴口を吸音材に向けて開
口させたことを特徴とする空調ダクト用消音器。4. The muffler for an air conditioning duct according to claim 1, wherein a resonance port of the resonator is opened toward a sound absorbing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21217599A JP3431863B2 (en) | 1999-07-27 | 1999-07-27 | Silencer for air conditioning duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21217599A JP3431863B2 (en) | 1999-07-27 | 1999-07-27 | Silencer for air conditioning duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001041021A true JP2001041021A (en) | 2001-02-13 |
| JP3431863B2 JP3431863B2 (en) | 2003-07-28 |
Family
ID=16618160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21217599A Expired - Fee Related JP3431863B2 (en) | 1999-07-27 | 1999-07-27 | Silencer for air conditioning duct |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3431863B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2834328A1 (en) * | 2001-12-28 | 2003-07-04 | Roland Robert Mathieu | Air duct silencer has noise-damping baffles of aerodynamic section facing alternately in opposite directions. |
| JP2007263466A (en) * | 2006-03-28 | 2007-10-11 | Toyoda Gosei Co Ltd | Air conditioning duct |
| JP2014201271A (en) * | 2013-04-09 | 2014-10-27 | ヤンマー株式会社 | Ship air conditioner |
| CN111164671A (en) * | 2017-10-03 | 2020-05-15 | 富士胶片株式会社 | Sound-deadening tubular structure |
-
1999
- 1999-07-27 JP JP21217599A patent/JP3431863B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2834328A1 (en) * | 2001-12-28 | 2003-07-04 | Roland Robert Mathieu | Air duct silencer has noise-damping baffles of aerodynamic section facing alternately in opposite directions. |
| JP2007263466A (en) * | 2006-03-28 | 2007-10-11 | Toyoda Gosei Co Ltd | Air conditioning duct |
| JP2014201271A (en) * | 2013-04-09 | 2014-10-27 | ヤンマー株式会社 | Ship air conditioner |
| CN111164671A (en) * | 2017-10-03 | 2020-05-15 | 富士胶片株式会社 | Sound-deadening tubular structure |
| JPWO2019069908A1 (en) * | 2017-10-03 | 2020-10-22 | 富士フイルム株式会社 | Silent tubular structure |
| US11536411B2 (en) | 2017-10-03 | 2022-12-27 | Fujifilm Corporation | Silencing tubular structure body |
| CN111164671B (en) * | 2017-10-03 | 2023-09-01 | 富士胶片株式会社 | Sound-deadening tubular structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3431863B2 (en) | 2003-07-28 |
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