JPH07305974A - Silencer - Google Patents

Silencer

Info

Publication number
JPH07305974A
JPH07305974A JP6098897A JP9889794A JPH07305974A JP H07305974 A JPH07305974 A JP H07305974A JP 6098897 A JP6098897 A JP 6098897A JP 9889794 A JP9889794 A JP 9889794A JP H07305974 A JPH07305974 A JP H07305974A
Authority
JP
Japan
Prior art keywords
wall
noise
duct
sound
punched plate
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.)
Pending
Application number
JP6098897A
Other languages
Japanese (ja)
Inventor
Koukan Yana
光環 梁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kuken Kogyo Co Ltd
Original Assignee
Kuken Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kuken Kogyo Co Ltd filed Critical Kuken Kogyo Co Ltd
Priority to JP6098897A priority Critical patent/JPH07305974A/en
Publication of JPH07305974A publication Critical patent/JPH07305974A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide a device which functions with an improved sound-deadening efficiency and whose deadening effect keeps unabated against soiling such as that of dust. CONSTITUTION:A silencer consists of a duct for the exhaust or feeding of gaseous matter having a double wall, of which the inner wall consists of a punched plate 8 with through holes 8a opened and the outer wall 7 hermetically covers the duct. The rate at which the through holes are opened in the punched plate 8 and the distance between the inner and outer walls of the double wall are set according to the frequency of the noise that is to be arrested. Furthermore, the sound-deadening effect is enhanced by applying a sound-absorbing material 9, such as glass wool, to the punched plate 8 on the side between the two walls and with some space left from the outer wall 7. Moreover, since the diameter of the through holes in the punched plate and the rate at which they are opened both are set according to the frequency of the noise to be suppressed, distinguishing measures can be taken against noise in a wide variety of cases. Basically the punched plate is designed to effect the silencing, which effect remains good against soiling such as that of dust. Waterproofing work is not required.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、冷却塔や諸設備の排、
送風口などの消音装置に関するものである。
BACKGROUND OF THE INVENTION The present invention relates to the discharge of cooling towers and various equipment,
The present invention relates to a muffling device such as a ventilation port.

【0002】[0002]

【従来の技術】都市圏のビルや建造物には大容量の空調
設備や換気設備が必要であるが、ビルや住居地が隣接し
ていると、空調設備等の送風機の騒音は公害問題とな
る。そのため、騒音対策が必須となる。
2. Description of the Related Art Buildings and structures in urban areas require large-capacity air-conditioning equipment and ventilation equipment, but when buildings and residential areas are adjacent to each other, noise from the air-conditioning equipment and other blowers is a pollution problem. Become. Therefore, noise countermeasures are essential.

【0003】特開昭52−103050号公報には、冷
却塔内外への気流出入口に実質上の距離を有した通路を
設け、この通路入口から通路出口に至るまで直線的に短
絡する気流が生じないような邪魔板を該通路内に配置
し、この邪魔板によって形成される屈曲気流の流れを実
質上乱さないようにこの屈曲気流の進行方向に沿ったス
リット板を吸音性材料で構成した冷却塔の消音装置が開
示されている。
In Japanese Unexamined Patent Publication No. 52-103050, a passage having a substantial distance is provided at an air inlet / outlet to the inside and outside of a cooling tower, and an air flow that short-circuits linearly from the passage inlet to the passage outlet is generated. A baffle that does not exist is arranged in the passage, and a slit plate along the traveling direction of the bending airflow is formed of a sound absorbing material so as not to substantially disturb the flow of the bending airflow formed by the baffle cooling. A muffler for a tower is disclosed.

【0004】また、特開平1−114696号公報に
は、冷却塔のファンケーシング上に設置する消音ダクト
であって、ダクト本体を少なくとも径方向に2体に分割
形成し、各ダクト本体の上端部と下端部とに内方に突出
するカバーをダクト本体と一体に設けると共に、ダクト
本体の内側ほぼ全体には網、支持枠、押さえピン等を介
して吸音材を設け、該ダクト本体同志を筒状に接続して
ファンケーシング上に設置した冷却塔の消音ダクトが開
示されている。
Further, Japanese Patent Laid-Open No. 1-114696 discloses a sound deadening duct installed on a fan casing of a cooling tower, in which the duct main body is divided into at least two radial parts and the upper end portion of each duct main body is formed. A cover projecting inward is provided integrally with the duct main body at the lower end and the lower end, and a sound absorbing material is provided almost entirely inside the duct main body through a net, a support frame, a holding pin, etc. A muffler duct for a cooling tower, which is connected in a circular shape and installed on a fan casing, is disclosed.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、このよ
うな消音装置では、ほこりなどでグラスウールが汚れる
ことにより、消音性能が低下するため、定期清掃しなけ
ればならず、また防水工事が必要などの不便がある。ま
た、特定周波数、騒音の対応、消音効果などにも問題が
ある。
However, in such a muffling device, the muffling performance is deteriorated due to dirt of the glass wool due to dust or the like, so that the muffler must be regularly cleaned and waterproof work is inconvenient. There is. There are also problems with specific frequencies, noise handling, and noise reduction effects.

【0006】本発明が解決すべき課題は、消音性能を向
上させ、ほこりなどの汚れに対しても消音効果が低下し
ない装置を提供することにある。
The problem to be solved by the present invention is to provide a device which improves the sound deadening performance and does not deteriorate the sound deadening effect against dirt such as dust.

【0007】[0007]

【課題を解決するための手段】前記課題を解決するた
め、本発明の消音装置は、排気ないし送気ダクトを二重
壁とし、内壁はパンチング板、外壁は密閉とし、消去し
ようとする騒音の周波数よりパンチング板の開孔率及び
前記二重壁の内外壁間の距離を設定したものである。
In order to solve the above problems, the muffler of the present invention uses a double wall for the exhaust or air supply duct, a punching plate for the inner wall and a closed wall for the outer wall to eliminate the noise to be erased. The aperture ratio of the punching plate and the distance between the inner and outer walls of the double wall are set based on the frequency.

【0008】この消音装置において、二重壁内のパンチ
ング板側に、外壁とは間隔を隔ててグラスウール等の吸
音材を貼着してもよい。
In this sound deadening device, a sound absorbing material such as glass wool may be attached to the punching plate side in the double wall at a distance from the outer wall.

【0009】前記排気ないし送気ダクト内にファンモー
タが設置されている場合には、ファンモータのケーシン
グを、パンチング板で成形された流線型の消音殻体で覆
ったものとする。この場合、ファンモータのケーシング
の内壁にグラスウール等の吸音材を貼着したものとする
ことができる。
When a fan motor is installed in the exhaust or air supply duct, the casing of the fan motor is covered with a streamlined sound deadening shell formed of a punching plate. In this case, a sound absorbing material such as glass wool may be attached to the inner wall of the casing of the fan motor.

【0010】また、送風機が内部に設置される排気ない
し送気ダクトの円筒部と、このダクトの吸気側開口のベ
ルマウス形状部を二重壁とすることができる。
Further, the cylindrical portion of the exhaust or air supply duct in which the blower is installed and the bell mouth shape portion of the intake side opening of this duct can be double walls.

【0011】[0011]

【作用】本発明では、排気ないし送気ダクトを二重と
し、内壁はパンチング板、外壁は密閉とし、壁間、空気
共鳴振動により消音を行う。パンチング板の裏面に薄い
グラスウールを貼り、消音効果を向上させる。また、送
風機モータ軸を流線型消音殻体に内蔵し、モータから発
生する騒音を低減する。排気ないし送気ダクトの吸気側
開口の周壁部分をベルマウス形状とすることにより、内
部を通る空気の抵抗を小さくする。
In the present invention, the exhaust or air supply duct is doubled, the inner wall is punched and the outer wall is hermetically sealed, and the sound is damped by the air resonance vibration between the walls. A thin glass wool is attached to the back of the punching board to improve the sound deadening effect. In addition, the fan motor shaft is built into the streamlined sound deadening shell to reduce the noise generated from the motor. By making the peripheral wall portion of the intake side opening of the exhaust or air supply duct into a bellmouth shape, the resistance of the air passing through the inside is reduced.

【0012】[0012]

【実施例】以下、本発明を実施例を参照しながら具体的
に説明する。図1は本発明を冷却塔に適用した実施例を
示すものであり、1は冷却塔本体、2は熱交換器、3は
散水槽、4はファンモータ、5はファン、6は消音ダク
トである。消音ダクト6は、図2に示すように、外壁7
および外壁7と二重壁になっているパンチング板8から
なり、パンチング板8には孔8aが開口されている。孔
8aの開孔率αは、消去しようとする騒音の周波数fに
よって設定する。
EXAMPLES The present invention will be specifically described below with reference to examples. FIG. 1 shows an embodiment in which the present invention is applied to a cooling tower. 1 is a cooling tower main body, 2 is a heat exchanger, 3 is a sprinkler tank, 4 is a fan motor, 5 is a fan, and 6 is a muffling duct. is there. As shown in FIG. 2, the muffler duct 6 includes an outer wall 7
The outer wall 7 and the punching plate 8 are double walls, and the punching plate 8 has a hole 8a. The aperture ratio α of the hole 8a is set by the frequency f of the noise to be erased.

【0013】例えば、一つの実験式を示すと次の通りで
ある。 α=16π(f2 /c2 1 2)V(t+0.8√Se) 但し、c:音速、t:パンチング板の厚み、D1 :内壁
の径、V:内外壁間の容積、Se:孔の面積 この式は例示であり、他の式に基づいて求めることがで
きることは言うまでもない。
For example, one empirical formula is as follows. α = 16π (f 2 / c 2 D 1 2) V (t + 0.8√Se) where, c: sound velocity, t: punching plate having a thickness, D 1: diameter of the inner wall, V: volume between inner and outer walls, Se : Area of holes This formula is an example, and it goes without saying that it can be obtained based on other formulas.

【0014】なお、パンチング板8の外周に10〜50
mm程度のグラスウール9を張ると、振動減衰効果が向
上する。
The outer circumference of the punching plate 8 is 10 to 50.
When the glass wool 9 of about mm is stretched, the vibration damping effect is improved.

【0015】図3は本発明の他の実施例を示すものであ
る。図1の実施例との相違点は、消音ダクト6の内壁で
あるパンチング板8の入口の部分8bをアールとし、ま
たファンモータ4の周囲を流線型の消音殻体10で覆っ
たことである。消音殻体10は図5に示すように、外壁
がパンチング板11であり、内周にグラスウール12が
貼り付けられている。この消音殻体10は、中心軸線を
中心にして2分割〜4分割し、ファンモータ4の外側か
ら装着できるようにしている。この場合のパンチング板
11の周囲にも孔11aが設けられており、この場合の
直径d’と開孔率α’とは、同じく実験の結果、消去し
ようとする騒音の周波数fによって設定する。
FIG. 3 shows another embodiment of the present invention. The difference from the embodiment of FIG. 1 is that the entrance portion 8b of the punching plate 8 which is the inner wall of the sound deadening duct 6 is rounded, and the periphery of the fan motor 4 is covered with a streamlined sound deadening shell 10. As shown in FIG. 5, the sound deadening shell 10 has a punching plate 11 on the outer wall thereof and glass wool 12 attached to the inner periphery thereof. The sound deadening shell 10 is divided into two to four parts about the central axis line so that the sound deadening shell part 10 can be mounted from the outside of the fan motor 4. Holes 11a are also provided around the punching plate 11 in this case, and the diameter d'and the aperture ratio α'in this case are set by the frequency f of the noise to be erased as a result of the same experiment.

【0016】このようにして、ファンモータ4からの騒
音を低減するとともに、ファンモータ4を湿り空気など
による腐食から保護することができる。また、消音殻体
10を流線型とすることにより、空気の流れを整流し、
空気の流れを円滑にして騒音の発生を防止する。
In this way, the noise from the fan motor 4 can be reduced and the fan motor 4 can be protected from corrosion due to moist air. Further, by making the sound deadening shell body 10 streamlined, the flow of air is rectified,
Smooth the air flow to prevent noise.

【0017】騒音の抑制効果の実験例を次に示す。An experimental example of the noise suppressing effect is shown below.

【表1】 [Table 1]

【0018】このように、図1の消音装置では10
(A)dBの雑音抑制効果が得られ、図3の消音装置で
は13(A)dBの雑音抑制効果が得られた。
As described above, the muffling device of FIG.
The noise suppressing effect of (A) dB was obtained, and the noise suppressing effect of 13 (A) dB was obtained in the silencer of FIG.

【0019】[0019]

【発明の効果】上述したように、本発明によれば下記の
効果を奏する。
As described above, the present invention has the following effects.

【0020】 消音しようとする騒音周波数でパンチ
ング板の孔径、開孔率を決めるので、多種多様のケース
で特徴的な騒音対策ができる。
Since the hole diameter and the opening rate of the punching plate are determined by the noise frequency to be silenced, characteristic noise measures can be taken in various cases.

【0021】 基本的にはパンチング板で消音する構
造であるので、ほこりなどによる汚れに強い。防水工事
不要となる。
Basically, the structure is such that the punching plate muffles the sound, so it is resistant to dirt due to dust and the like. No need for waterproofing work.

【0022】 状況に応じて、壁間にグラスウール等
の多孔質材料を入れることにより一層消音効果が向上す
る。
Depending on the situation, the silencing effect can be further improved by inserting a porous material such as glass wool between the walls.

【0023】 騒音発生源のところで対策を施すの
で、消音効果が大である。
Since the countermeasure is taken at the noise source, the silencing effect is great.

【0024】 消音ダクトの中心部に流線型の消音殻
体を設けることにより、空気の流れを整流し、流れは円
滑になる。
By providing a streamlined sound deadening shell at the center of the sound deadening duct, the flow of air is rectified and the flow becomes smooth.

【0025】 モータを消音殻体に内蔵することによ
り、モータを湿り空気から保護し、モータの使用寿命が
長くなる。
By incorporating the motor in the sound deadening shell, the motor is protected from moist air and the service life of the motor is extended.

【0026】 排気ないし送気ダクトの吸気側開口の
周壁部分をベルマウス形状とすることにより、内部を通
る空気の抵抗を小さくし、騒音の発生を抑えることがで
きる。
By forming the peripheral wall portion of the intake side opening of the exhaust or air supply duct into a bellmouth shape, it is possible to reduce the resistance of the air passing through the inside and suppress the generation of noise.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の第1実施例を示す冷却塔の断面図で
ある。
FIG. 1 is a sectional view of a cooling tower showing a first embodiment of the present invention.

【図2】 第1実施例における消音ダクトの構造を示す
断面図である。
FIG. 2 is a cross-sectional view showing the structure of a sound deadening duct in the first embodiment.

【図3】 本発明の第2実施例を示す冷却塔の断面図で
ある。
FIG. 3 is a sectional view of a cooling tower showing a second embodiment of the present invention.

【図4】 第2実施例における消音ダクトの構造を示す
断面図である。
FIG. 4 is a sectional view showing the structure of a muffling duct in a second embodiment.

【図5】 第2実施例における消音殻体の構造を示す断
面図である。
FIG. 5 is a sectional view showing a structure of a sound deadening shell body according to a second embodiment.

【符号の説明】[Explanation of symbols]

1 冷却塔本体、2 熱交換器、3 散水槽、4 ファ
ンモータ、5 ファン、6 消音ダクト、7 外壁、8
パンチング板、8a 孔、8b 入口部、9グラスウ
ール、10 消音殻体、11 パンチング板11、11
a 孔、12グラスウール
1 cooling tower body, 2 heat exchanger, 3 sprinkler tank, 4 fan motor, 5 fan, 6 muffler duct, 7 outer wall, 8
Punching board, 8a hole, 8b entrance, 9 glass wool, 10 sound deadening shell, 11 punching board 11, 11
a hole, 12 glass wool

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 排気ないし送気ダクトを二重壁とし、内
壁はパンチング板、外壁は密閉とし、消去しようとする
騒音の周波数によりパンチング板の開孔率及び前記二重
壁の内外壁間の距離を設定したことを特徴とする消音装
置。
1. An exhaust or air supply duct has a double wall, an inner wall is a punching plate, and an outer wall is a hermetically sealed structure. A silencer characterized by setting a distance.
【請求項2】 二重壁内のパンチング板側に、外壁とは
間隔を隔ててグラスウール等の吸音材を貼着したことを
特徴とする請求項1記載の消音装置。
2. The sound deadening device according to claim 1, wherein a sound absorbing material such as glass wool is attached to the punching plate side in the double wall at a distance from the outer wall.
【請求項3】 排気ないし送気ダクト内にファンモータ
が設置されている場合には、ファンモータのケーシング
を、パンチング板で成形された流線型の消音殻体で覆っ
たことを特徴とする請求項1または2記載の消音装置。
3. When the fan motor is installed in the exhaust or air supply duct, the fan motor casing is covered with a streamlined sound deadening shell formed of a punching plate. The silencer according to 1 or 2.
【請求項4】 ファンモータのケーシングの内壁にグラ
スウール等の吸音材を貼着したことを特徴とする請求項
3記載の消音装置。
4. The sound deadening device according to claim 3, wherein a sound absorbing material such as glass wool is attached to the inner wall of the casing of the fan motor.
【請求項5】 送風機が内部に設置される排気ないし送
気ダクトの円筒部と、このダクトの吸気側開口のベルマ
ウス形状部を二重壁としたことを特徴とする請求項1ま
たは2記載の消音装置。
5. The double-walled structure according to claim 1, wherein a cylindrical portion of an exhaust or air supply duct in which the blower is installed and a bell mouth shape portion of an intake side opening of the duct are double walls. Silencer.
JP6098897A 1994-05-12 1994-05-12 Silencer Pending JPH07305974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6098897A JPH07305974A (en) 1994-05-12 1994-05-12 Silencer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6098897A JPH07305974A (en) 1994-05-12 1994-05-12 Silencer

Publications (1)

Publication Number Publication Date
JPH07305974A true JPH07305974A (en) 1995-11-21

Family

ID=14231929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6098897A Pending JPH07305974A (en) 1994-05-12 1994-05-12 Silencer

Country Status (1)

Country Link
JP (1) JPH07305974A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103471420A (en) * 2013-09-23 2013-12-25 北京中亚康源环保工程有限公司 Noise control device for air inlet of large machine ventilation cooling tower
JP2017195730A (en) * 2016-04-22 2017-10-26 ミネベアミツミ株式会社 motor
CN109931297A (en) * 2017-12-18 2019-06-25 厦门嘉达环保科技有限公司 Metope exhaust fan composite muffler
CN110081528A (en) * 2019-05-05 2019-08-02 中南大学 A kind of compound ventilation air-changing device of muting function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60170100U (en) * 1984-04-20 1985-11-11 松下精工株式会社 Silencer for axial blower
JPS62217833A (en) * 1986-03-18 1987-09-25 Toshiba Corp Muffling device of rotary electric machine
JPH041349U (en) * 1990-04-16 1992-01-08
JPH0516795A (en) * 1991-07-09 1993-01-26 Sumitomo Heavy Ind Ltd Silencer for fan of hovercraft(r)

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60170100U (en) * 1984-04-20 1985-11-11 松下精工株式会社 Silencer for axial blower
JPS62217833A (en) * 1986-03-18 1987-09-25 Toshiba Corp Muffling device of rotary electric machine
JPH041349U (en) * 1990-04-16 1992-01-08
JPH0516795A (en) * 1991-07-09 1993-01-26 Sumitomo Heavy Ind Ltd Silencer for fan of hovercraft(r)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103471420A (en) * 2013-09-23 2013-12-25 北京中亚康源环保工程有限公司 Noise control device for air inlet of large machine ventilation cooling tower
CN103471420B (en) * 2013-09-23 2015-03-18 北京中亚康源环保工程有限公司 Noise control device for air inlet of large machine ventilation cooling tower
JP2017195730A (en) * 2016-04-22 2017-10-26 ミネベアミツミ株式会社 motor
CN109931297A (en) * 2017-12-18 2019-06-25 厦门嘉达环保科技有限公司 Metope exhaust fan composite muffler
CN110081528A (en) * 2019-05-05 2019-08-02 中南大学 A kind of compound ventilation air-changing device of muting function
CN110081528B (en) * 2019-05-05 2020-06-30 中南大学 Ventilation device with mute effect

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