JPH06117399A - Muffler device for air jetting blower - Google Patents
Muffler device for air jetting blowerInfo
- Publication number
- JPH06117399A JPH06117399A JP26576292A JP26576292A JPH06117399A JP H06117399 A JPH06117399 A JP H06117399A JP 26576292 A JP26576292 A JP 26576292A JP 26576292 A JP26576292 A JP 26576292A JP H06117399 A JPH06117399 A JP H06117399A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- silencer
- sound
- electric motor
- case
- 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
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は自動車トンネルの換気設
備等に利用される噴流送風機(以下ジェットファンと言
う)のサイレンサとして好適なジェットファンの消音装
置に係り、特に、アクティブノイズコントロール(以下
ANCと言う)を使用したものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for a jet fan suitable as a silencer for a jet blower (hereinafter referred to as a jet fan) used in a ventilation facility of an automobile tunnel, and more particularly to an active noise control (hereinafter referred to as ANC). Say) used.
【0002】[0002]
【従来の技術】従来のジェットファンは、道路トンネル
技術基準(換気編)・同解説(昭和60年12月)日本道路
協会発行の第141頁から第145頁に記載のように、
電動機と、電動機に直結された羽根車を内蔵する本体ケ
ース、本体ケースの前後に設けられたサイレンサケース
より構成されている。このサイレンサケースは通風面側
に有孔鋼板を設け、有孔鋼板と外鋼板との間に吸音特性
の良好な吸音材をはさみこんだ構造となっている。2. Description of the Related Art A conventional jet fan is as described in Road Tunnel Technical Standards (Ventilation) / Commentary (December 1985), Japan Road Association, pages 141-145.
It is composed of an electric motor, a main body case containing an impeller directly connected to the electric motor, and a silencer case provided in front of and behind the main body case. This silencer case has a structure in which a perforated steel plate is provided on the ventilation surface side, and a sound absorbing material having good sound absorbing characteristics is sandwiched between the perforated steel plate and the outer steel plate.
【0003】[0003]
【発明が解決しようとする課題】従来のサイレンサは吸
音材の構造となっているため、消音量を大きくしジェッ
トファンの低騒音化を図るためには、サイレンサ部分を
長くする必要がある。しかし、ジェットファンはトンネ
ル天井部に設置されること、又、効率の面からも長くす
ることは望ましくない。Since the conventional silencer has a structure of a sound absorbing material, it is necessary to lengthen the silencer portion in order to increase the volume of noise and to reduce the noise of the jet fan. However, it is not desirable to install the jet fan on the ceiling of the tunnel and to make it long in terms of efficiency.
【0004】一方、ジェットファンの騒音の周波数特性
は、基本周波数(翼枚数×回転数)が100Hzから40
0Hzと低いこと、吸音材の特性から低周波領域の吸音
率が少ないため、サイレンサ部分を長くしても低周波領
域が残ってしまいオーバーオールの騒音レベル低減の効
果が少ない。On the other hand, the frequency characteristic of the noise of the jet fan shows that the fundamental frequency (the number of blades x the number of revolutions) is 100 Hz to 40 Hz.
Since it is as low as 0 Hz and the sound absorption coefficient in the low frequency region is small due to the characteristics of the sound absorbing material, even if the silencer portion is lengthened, the low frequency region remains and the overall noise level reduction effect is small.
【0005】本発明の目的は、低周波領域はANCの方
法により消音し、高周波領域は従来の吸音方法を使用す
ることで、従来より小形で消音効果の得られるサイレン
サを提供することにある。An object of the present invention is to provide a silencer which is smaller than conventional ones and which can obtain a silencing effect by using the ANC method for silencing the low frequency region and using the conventional sound absorbing method for the high frequency region.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明は電動機と羽根車から発生する騒音と別の音
源から、騒音と逆位相,同一周波数,同一音圧レベルの
音波をスピーカより発生させ、能動的に騒音を減衰させ
るアクティブノイズコントロールを備える。In order to achieve the above object, the present invention uses a sound source different from noise generated by an electric motor and an impeller to generate a sound wave having a phase opposite to that of the noise, the same frequency and the same sound pressure level from a speaker. An active noise control is provided to generate and actively attenuate noise.
【0007】[0007]
【作用】上記手段によれば、スピーカから騒音と逆位
相,同一周波数,同一音圧レベルの音波を発生させ、ケ
ース内で騒音と合成させることにより、能動的に騒音を
低減させ、しかも吸音材を用いたサイレンサケースと一
緒にジェットファンに取り付けることにより、オーバー
オールの騒音レベルが低減できる。According to the above means, sound waves having an opposite phase, the same frequency, and the same sound pressure level as the noise are generated from the speaker and are combined with the noise in the case, whereby the noise is actively reduced and the sound absorbing material is also provided. The noise level of the overall can be reduced by attaching it to the jet fan together with the silencer case using.
【0008】[0008]
【実施例】トンネルに設置されるジェットファンは、図
3に示すように誘導電動機2を使用し、一定回転で運転
するため、発生する騒音はほとんど変化せず、定常音と
考えられる。このため図4のように、電動機2と羽根車
1から発生する騒音と逆位相,同一周波数,同一音圧レ
ベルの一定音波を、サイレンサケース9に設けたスピー
カ3より出力することにより、騒音を相殺させて減音さ
せることができる。EXAMPLE A jet fan installed in a tunnel uses an induction motor 2 as shown in FIG. 3 and operates at a constant rotation, so that the generated noise hardly changes and is considered to be a steady noise. Therefore, as shown in FIG. 4, a constant sound wave having an opposite phase, the same frequency, and the same sound pressure level as the noise generated from the electric motor 2 and the impeller 1 is output from the speaker 3 provided in the silencer case 9 to reduce the noise. It can be offset to reduce the sound.
【0009】しかし、理論的には上記の通りであるが、
周囲温度の変化等により一定音波をスピーカより発生さ
せるだけでは騒音と逆位相の音波にならず、減音効果を
上げることができない。このため図5のように、サイレ
ンサケース9内にエラーマイク5を設置し、エラーマイ
クより合成音を取り込み、サイレンサケース9の外板部
に設けたコントローラ4を介しフィードッバックさせ、
スピーカより発生させる音を変化させることにより、消
音効果を上げることができる。However, theoretically as described above,
Only by generating a constant sound wave from the speaker due to a change in ambient temperature, etc., a sound wave having a phase opposite to that of noise cannot be obtained, and the sound reduction effect cannot be enhanced. Therefore, as shown in FIG. 5, the error microphone 5 is installed in the silencer case 9, the synthesized sound is taken in from the error microphone, and is fed back through the controller 4 provided on the outer plate portion of the silencer case 9.
The muffling effect can be improved by changing the sound generated from the speaker.
【0010】又、上記以外に、吸い込み側と吐出側では
実際には音が違うと考えられる。したがって、図6のよ
うに、吐出側と吸い込み側にそれぞれエラーマイク5を
設置し、コントローラ4を介して吸い込み側と吐出側そ
れぞれに最適な音波を発生させる複数個のスピーカ3を
設置し、音波を出力させることにより、騒音を低減させ
ることができる。In addition to the above, it is considered that the sound is actually different between the suction side and the discharge side. Therefore, as shown in FIG. 6, error microphones 5 are installed on the discharge side and the suction side, respectively, and a plurality of speakers 3 for generating optimum sound waves are installed on the suction side and the discharge side via the controller 4, respectively. By outputting, the noise can be reduced.
【0011】以上のように、ANCは低周波領域の消音
に優れているが、サイレンサケースの断面が大きくなる
と減音効果が小さくなるため、ANCを設置する断面寸
法を基本周波数の波長の半分以下になるよう、図1のよ
うに隔壁を設置して、ジェットファンの断面を複数個に
分割し、各々にスピーカを設置することにより、低周波
領域の騒音を効率良く低減させることができる。又、従
来より使用している、高周波領域の消音効果に優れてい
る吸音材を用いたサイレンサケースと組み合わせて使用
することにより、オーバーオールの騒音低減を図ること
ができる。As described above, although the ANC is excellent in silencing in the low frequency region, the noise reduction effect becomes smaller as the cross section of the silencer case becomes larger. Therefore, the cross sectional dimension where the ANC is installed is less than half the wavelength of the fundamental frequency. As shown in FIG. 1, a partition is installed as shown in FIG. 1, the jet fan is divided into a plurality of cross sections, and a speaker is installed in each of them, so that noise in a low frequency region can be efficiently reduced. Further, by using it in combination with a silencer case that is conventionally used and uses a sound absorbing material that is excellent in sound deadening effect in a high frequency range, overall noise can be reduced.
【0012】[0012]
【発明の効果】本発明によれば、ANCにより低周波領
域を低減することができるので、従来の高周波域の消音
に有効な吸音材を用いたサイレンサケースと組み合わせ
ることにより、従来の方法に比較して大きな消音効果の
得られるサイレンサを提供できる。According to the present invention, since the low frequency region can be reduced by ANC, it can be compared with the conventional method by combining with a conventional silencer case using a sound absorbing material effective for silencing the high frequency region. It is possible to provide a silencer having a great silencing effect.
【図1】スピーカ,エラーマイク,コントローラ,隔壁
を設置したジェットファンの噴流方向の断面図。FIG. 1 is a cross-sectional view of a jet fan provided with a speaker, an error microphone, a controller, and a partition wall in the jet direction.
【図2】図1のA−A矢視断面図。FIG. 2 is a sectional view taken along the line AA of FIG.
【図3】従来形ジェットファンの噴流方向の断面図。FIG. 3 is a sectional view of a conventional jet fan in a jet flow direction.
【図4】従来のジェットファンにスピーカのみを設置し
た噴流方向の断面図。FIG. 4 is a cross-sectional view in the jet direction in which only a speaker is installed in a conventional jet fan.
【図5】図4にエラーマイクとコントローラを設置した
断面図。FIG. 5 is a cross-sectional view in which an error microphone and a controller are installed in FIG.
【図6】図5のエラーマイクとコントローラを吸い込み
側と吐出側、両側に設置した断面図。6 is a cross-sectional view in which the error microphone and the controller of FIG. 5 are installed on the suction side, the discharge side, and both sides.
1…インペラ、2…電動機、3…スピーカ、4…コント
ローラ、5…エラーマイク、6…吸音材、7…隔壁。1 ... Impeller, 2 ... Electric motor, 3 ... Speaker, 4 ... Controller, 5 ... Error microphone, 6 ... Sound absorbing material, 7 ... Partition.
Claims (1)
を内蔵する本体ケースと、騒音を低減するために前記本
体ケースの前後に設けた円筒状の吸音材を装備したサイ
レンサケースよりなる噴流送風機において、前記電動機
と前記羽根車から発生する騒音とは別の音源から、騒音
と逆位相,同一周波数,同一音圧レベルの音波を付加し
て、能動的に騒音を減衰させるアクティブノイズコント
ロールを備えていることを特徴とする噴流送風機の消音
装置。1. A jet flow comprising an electric motor, a main body case having a built-in impeller directly connected to the electric motor, and a silencer case equipped with cylindrical sound absorbing materials provided in front of and behind the main body case to reduce noise. In the blower, active noise control for actively attenuating noise by adding sound waves having a phase opposite to that of the noise, the same frequency, and the same sound pressure level from a sound source different from the noise generated from the electric motor and the impeller is provided. A silencer for a jet blower characterized by being provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26576292A JPH06117399A (en) | 1992-10-05 | 1992-10-05 | Muffler device for air jetting blower |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26576292A JPH06117399A (en) | 1992-10-05 | 1992-10-05 | Muffler device for air jetting blower |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06117399A true JPH06117399A (en) | 1994-04-26 |
Family
ID=17421671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26576292A Pending JPH06117399A (en) | 1992-10-05 | 1992-10-05 | Muffler device for air jetting blower |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06117399A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0979199A (en) * | 1995-09-13 | 1997-03-25 | Hitachi Ltd | Motor-driven air blower |
US6078671A (en) * | 1996-09-05 | 2000-06-20 | Ebara Corporation | Silencer for attenuating a sound or noise transmitted through an air passage of a duct |
JP2006170045A (en) * | 2004-12-15 | 2006-06-29 | Hitachi Industries Co Ltd | Axial blower |
CN104963899A (en) * | 2015-07-14 | 2015-10-07 | 柳州职业技术学院 | Silencer of draught fan |
CN105351256A (en) * | 2015-11-28 | 2016-02-24 | 贵州航天林泉电机有限公司 | Muffler |
CN105736478A (en) * | 2016-03-30 | 2016-07-06 | 王刚 | Sound insulation and noise reduction device of draught fan |
US9872104B2 (en) | 2010-04-15 | 2018-01-16 | Nortek Air Solutions, Llc | Methods and systems for active sound attenuation in a fan unit |
EP2378133B1 (en) * | 2010-04-15 | 2018-07-18 | Nortek Air Solutions, LLC | Method and system for active sound attenuation in an air handling unit |
CN108591129A (en) * | 2018-04-02 | 2018-09-28 | 郑州云海信息技术有限公司 | A kind of adaptive server active noise reduction system and noise-reduction method |
CN109058175A (en) * | 2018-07-26 | 2018-12-21 | 广东海信家电有限公司 | A kind of denoising device |
CN110454421A (en) * | 2019-07-31 | 2019-11-15 | 宁波方太厨具有限公司 | A kind of method for noise reduction control of centrifugal blower and the centrifugal blower |
-
1992
- 1992-10-05 JP JP26576292A patent/JPH06117399A/en active Pending
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0979199A (en) * | 1995-09-13 | 1997-03-25 | Hitachi Ltd | Motor-driven air blower |
US6078671A (en) * | 1996-09-05 | 2000-06-20 | Ebara Corporation | Silencer for attenuating a sound or noise transmitted through an air passage of a duct |
JP2006170045A (en) * | 2004-12-15 | 2006-06-29 | Hitachi Industries Co Ltd | Axial blower |
US9872104B2 (en) | 2010-04-15 | 2018-01-16 | Nortek Air Solutions, Llc | Methods and systems for active sound attenuation in a fan unit |
EP2378133B1 (en) * | 2010-04-15 | 2018-07-18 | Nortek Air Solutions, LLC | Method and system for active sound attenuation in an air handling unit |
CN104963899A (en) * | 2015-07-14 | 2015-10-07 | 柳州职业技术学院 | Silencer of draught fan |
CN105351256A (en) * | 2015-11-28 | 2016-02-24 | 贵州航天林泉电机有限公司 | Muffler |
CN105736478A (en) * | 2016-03-30 | 2016-07-06 | 王刚 | Sound insulation and noise reduction device of draught fan |
CN108591129A (en) * | 2018-04-02 | 2018-09-28 | 郑州云海信息技术有限公司 | A kind of adaptive server active noise reduction system and noise-reduction method |
CN109058175A (en) * | 2018-07-26 | 2018-12-21 | 广东海信家电有限公司 | A kind of denoising device |
CN109058175B (en) * | 2018-07-26 | 2020-07-14 | 广东海信家电有限公司 | Noise reduction device |
CN110454421A (en) * | 2019-07-31 | 2019-11-15 | 宁波方太厨具有限公司 | A kind of method for noise reduction control of centrifugal blower and the centrifugal blower |
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