JPH0722009U

JPH0722009U - Silencer

Info

Publication number: JPH0722009U
Application number: JP5603293U
Authority: JP
Inventors: 修治岩上; 良幸畑崎
Original assignee: Shinmaywa Industries Ltd
Current assignee: Shinmaywa Industries Ltd
Priority date: 1993-09-21
Filing date: 1993-09-21
Publication date: 1995-04-21
Anticipated expiration: 2008-09-21
Also published as: JP2586485Y2

Abstract

(57)【要約】【目的】特定の周波数の音を効率よく消音する消音性
能を確保しつつ、よりコンパクトな消音器２１を提供す
ることを目的とする。【構成】消音器２１は接続部２２と消音部２３とフィ
ルタ部２４とからなる。ルーツブロワに接続状とされる
消音器２１の接続部２２に近い方に膨張形消音器部２３
ａが備えられる。該膨張形消音器部２３ａに続いて連続
状に共鳴形消音器部２３ｂが備えられる。 (57) [Abstract] [Purpose] An object of the present invention is to provide a more compact silencer 21 while ensuring the silencing performance of efficiently silencing sound of a specific frequency. [Structure] The silencer 21 includes a connection portion 22, a silencer portion 23, and a filter portion 24. The expansion-type silencer portion 23 is located closer to the connection portion 22 of the silencer 21 connected to the roots blower.
a is provided. A resonance type silencer portion 23b is continuously provided after the expansion type silencer portion 23a.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、ルーツブロワ等の流体機械に用いられ、特に吸込側の流体音を抑えるのに適する消音器に関するものである。 The present invention relates to a silencer which is used in a fluid machine such as a roots blower and is particularly suitable for suppressing the fluid noise on the suction side.

【０００２】[0002]

【従来の技術】[Prior art]

例えば、図６および図７に示される如く、ルーツブロワ１の吸込部２に接続される消音器として膨張形消音器３がある。 For example, as shown in FIGS. 6 and 7, there is an expansion silencer 3 as a silencer connected to the suction portion 2 of the roots blower 1.

【０００３】この膨張形消音器３は円管状の外筒４と、外筒４の両端部をそれぞれ閉塞状として装着された端板５、６と、外筒４の中心に沿って下側の端板５位置より上側の端板６を嵌通して上方突出状に装着された小径のパンチングメタル製内管７と、外筒４と同心状で下側の端板５の外面側に固定され、かつ外筒４より小径の入口管８と、ルーツブロワ１の吸込部２に対する接続用としての入口管８下端に備えられた接続フランジ部９と、内管７の前記上方突出部外方を囲繞して装着されたフィルタ部１０とを備えている。The expansion silencer 3 has a cylindrical outer cylinder 4, end plates 5 and 6 mounted with both ends of the outer cylinder 4 closed, and a lower end along the center of the outer cylinder 4. A small diameter punching metal inner tube 7 which is fitted in an upward projecting manner by inserting an end plate 6 above the position of the end plate 5 on the side, and an outer pipe side of the lower end plate 5 which is concentric with the outer cylinder 4. An inlet pipe 8 that is fixed and has a diameter smaller than that of the outer cylinder 4, a connection flange portion 9 provided at the lower end of the inlet pipe 8 for connecting to the suction portion 2 of the roots blower 1, and the upward protruding portion of the inner pipe 7. The filter unit 10 is mounted so as to surround the outside.

【０００４】前記フィルタ部１０は、内外二重構造とされたパンチングメタル製の外フィルタ受け１０ａおよび内フィルタ受け１０ｂと、両フィルタ受け１０ａ、１０ｂ間に装着されたフィルタ１０ｃとから構成されている。The filter unit 10 is composed of an outer filter receiver 10a and an inner filter receiver 10b made of punching metal having an inner and outer double structure, and a filter 10c mounted between the both filter receivers 10a and 10b. There is.

【０００５】そして、フィルタ部１０は、内管７の上端部に上方突出状に固定されたボルト部１１にナット１２で螺合締結された押え板１３と、前記上側の端板６とにより挟持状に保持されている。The filter portion 10 is sandwiched by a holding plate 13 screwed and fastened with a nut 12 to a bolt portion 11 fixed to the upper end portion of the inner pipe 7 in a protruding manner, and the upper end plate 6. Is held in a shape.

【０００６】また、外筒４と内管７との間の空洞部には吸音材１４が充填状に装着され、上下の端板５、６間が膨張形消音部１５として構成されている。Further, a sound absorbing material 14 is mounted in a space between the outer tube 4 and the inner tube 7 in a filling state, and an expansion type sound deadening part 15 is formed between the upper and lower end plates 5 and 6. .

【０００７】そして、ルーツブロワ１の作動により、空気はフィルタ部１０から吸引され、内管７、入口管８を通じてルーツブロワ１側に吸い込まれる。また、この際発生するルーツブロワ１側の流体音等の騒音は膨張形消音器３の膨張形消音部１５で消音される。Then, by the operation of the roots blower 1, air is sucked from the filter unit 10 and is sucked into the roots blower 1 side through the inner pipe 7 and the inlet pipe 8. Further, the noise such as the fluid sound on the side of the roots blower 1 generated at this time is silenced by the expansion type silencer 15 of the expansion type silencer 3.

【０００８】例えば、この種の膨張形の消音器として実開昭６０ー４７８９２号公報に開示の構造のものがある。For example, as an expansion type silencer of this type, there is a structure disclosed in Japanese Utility Model Laid-Open No. 60-47892.

【０００９】[0009]

【考案が解決しようとする課題】[Problems to be solved by the device]

しかしながら、上記膨張形消音器３にあっては、膨張形消音部１５の長さとして、消音しようとする周波数の波長の１／４の長さが最低でも必要とされ、低周波数の音を消音しようとすると消音器３全体が大形化する欠点があった。 However, in the expansion-type silencer 3, the expansion-type silencer 15 needs to have a length of at least ¼ of the wavelength of the frequency to be silenced, so that a low-frequency sound is generated. There was a drawback that the silencer 3 as a whole became large in size when it was attempted to muffle it.

【００１０】また、膨張形消音器３では、膨張形消音部１５の長さによって決まる基本周波数の奇数倍の周波数の音に消音効果があるが、それから外れた周波数の音には消音効果がないため、種々の周波数の音が含まれている場合には、通常、複数の長さの異なる膨張形消音部１５を組み合わせることによって消音する方式が採用されており、この点からも膨張形消音器３の大形化を招くという欠点があった。Further, in the expansion silencer 3, the sound having a frequency that is an odd multiple of the fundamental frequency determined by the length of the expansion silencer 15 has a muffling effect, but the sound having a frequency outside the range has a muffling effect. Therefore, when sound of various frequencies is included, a method of muffling is usually adopted by combining a plurality of expansion-type muffling sections 15 having different lengths. There is a drawback that the size of the silencer 3 is increased.

【００１１】そこで、本考案は上記問題点に鑑み、特定の周波数の音を効率よく消音する消音性能を確保しつつ、よりコンパクトな消音器を提供することを目的とする。In view of the above problems, an object of the present invention is to provide a more compact silencer while ensuring the silencing performance of efficiently silencing a sound of a specific frequency.

【００１２】[0012]

【課題を解決するための手段】[Means for Solving the Problems]

上記目的を達成するための技術的手段は、音源側に接続状とされる消音器の接続部に近い方に膨張形消音器部が備えられ、該膨張形消音器部に続いて共鳴形消音器部が備えられてなる点にある。 The technical means for achieving the above-mentioned object is to provide an expansion silencer near a connection portion of a silencer connected to the sound source side, and to connect the expansion silencer with a resonance type silencer. The point is that the silencer section is provided.

【００１３】[0013]

【作用】[Action]

本考案によれば、音源からでる音のうち、低周波数の音に対しては、膨張形消音器に比較して長さが短く構成できる共鳴形消音器部で消音し、他の周波数の音に対しては、膨張形消音器部で消音する。 According to the present invention, of the sound emitted from the sound source, the low frequency sound is silenced by the resonance silencer that can be configured to have a shorter length than the expansion silencer, and the other frequencies With respect to sound, it is silenced by the expansion silencer.

【００１４】この際、音源に近い方に膨張形消音器部が配置され、遠い方に共鳴形消音器部が配置されているため、音源からの音が共鳴形消音器部に入るまでに、軸方向のみに伝わる平面波に近くなり、目的とする特定の共鳴周波数の音が共鳴形消音器部によって効率よく消音できる。At this time, since the expansion type silencer section is arranged closer to the sound source and the resonance type silencer section is arranged farther from the sound source, before the sound from the sound source enters the resonance type silencer section, It becomes close to a plane wave that propagates only in the axial direction, and the sound of a specific resonance frequency of interest can be effectively silenced by the resonance silencer.

【００１５】[0015]

【実施例】【Example】

以下、本考案の実施例を図面に基づいて説明すると、図１に示される如く、消音器２１は、ルーツブロワ１の吸込部２に接続される接続部２２と、該接続部２２に続く消音部２３と、該消音部２３に続くフィルタ部２４とから主構成されている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a silencer 21 is connected to a suction portion 2 of a roots blower 1 and a connection portion 22 and a connection portion 22. It is mainly composed of a muffling section 23 and a filter section 24 following the muffling section 23.

【００１６】前記消音部２３は、接続部２２に近い側に配置された膨張形消音器部２３ａと遠い側に連続的に配置された共鳴形消音器部２３ｂとからなり、膨張形消音器部２３ａは前述同様、円管状の外筒２６と、外筒２６の両端部をそれぞれ閉塞状として装着された端板２７、２８と、外筒２６の中心に沿って両端板２７、２８間にわたって装着された小径のパンチングメタル製内管２９と、外筒２６と内管２９との間の空洞部に充填状に装着された吸音材３０とから構成されている。The muffling section 23 includes an inflatable silencer section 23 a arranged near the connecting section 22 and a resonant muffler section 23 b continuously arranged in the far side. Similarly to the above, the reference numeral 23a designates a cylindrical outer cylinder 26, end plates 27 and 28 mounted by closing both ends of the outer cylinder 26, and between both end plates 27 and 28 along the center of the outer cylinder 26. The inner pipe 29 is made of punching metal and has a small diameter, and the sound absorbing member 30 is filled in the cavity between the outer cylinder 26 and the inner pipe 29.

【００１７】また、上下の端板２７、２８には、内管２９の内径と同一径の開口２７ａ、２８ａがそれぞれその中心に連通状に形成されている。Further, the upper and lower end plates 27, 28 are formed with openings 27 a, 28 a having the same diameter as the inner diameter of the inner pipe 29, respectively, so as to communicate with the centers thereof.

【００１８】前記共鳴形消音器部２３ｂは、前記外筒２６の外径と同一径の円管状の外筒３１と、外筒３１の両端部をそれぞれ閉塞状として装着された端板２８、３２と、外筒３１の中心に沿って両端板２８、３２間にわたって装着されると共に前記内管２９と同一内径に形成された共鳴管３３とから構成されており、共鳴管３３には適宜径の共鳴孔３３ａが適宜数形成されている。そして、外筒３１と共鳴管３３との間の空洞部が共鳴室３４とされている。The resonance type silencer portion 23b includes a cylindrical outer cylinder 31 having the same diameter as the outer diameter of the outer cylinder 26, and an end plate 28 attached with both ends of the outer cylinder 31 closed. 32 and a resonance tube 33 which is mounted along the center of the outer cylinder 31 between the both end plates 28 and 32 and has the same inner diameter as the inner tube 29. The resonance tube 33 has an appropriate diameter. The resonance holes 33a are formed in an appropriate number. The cavity between the outer cylinder 31 and the resonance tube 33 serves as a resonance chamber 34.

【００１９】また、上側の端板３２にも前述同様、共鳴管３３の内径と同一径の開口３２ａがその中心に連通状に形成されている。Further, similarly to the above, an opening 32 a having the same diameter as the inner diameter of the resonance tube 33 is formed in the center of the upper end plate 32 so as to communicate with each other.

【００２０】前記フィルタ部２４位置において、端板３２上面側に、端板３２の開口３２ａと同一内径に形成されたパンチングメタル製の尾管３６が装着されており、尾管３６外方を囲繞して装着されたフィルタ部２４は、前述同様、内外二重構造とされたパンチングメタル製の外フィルタ受け２４ａおよび内フィルタ受け２４ｂと、両フィルタ受け２４ａ、２４ｂ間に装着されたフィルタ２４ｃとから構成されている。At the position of the filter portion 24, a tail pipe 36 made of punching metal and having the same inner diameter as the opening 32 a of the end plate 32 is mounted on the upper surface side of the end plate 32 and surrounds the outside of the tail pipe 36. As described above, the filter portion 24 mounted in the same manner includes an outer filter receiver 24a and an inner filter receiver 24b made of punching metal, which have an inner and outer double structure, and a filter 24c mounted between the filter receivers 24a and 24b. It consists of

【００２１】そして、フィルタ部２４は、尾管３６の上端部に上方突出状に固定されたボルト部３７にナット３８で螺合締結された押え板３９と、前記端板３２とにより挟持状に保持されている。The filter portion 24 is sandwiched by a holding plate 39 screwed and fastened with a nut 38 to a bolt portion 37 fixed to the upper end of the tail pipe 36 so as to project upward, and the end plate 32. Is held in a shape.

【００２２】前記接続部２２は、前述同様、外筒２６と同心状で下側の端板２７の外面側に固定され、かつ外筒２６より小径の入口管４１と、ルーツブロワ１の吸込部２に対する接続用としての入口管４１下端に備えられた接続フランジ部４２とから構成されている。As described above, the connecting portion 22 is concentric with the outer cylinder 26 and is fixed to the outer surface side of the lower end plate 27, and has a smaller diameter than the outer cylinder 26, and the suction portion 2 of the roots blower 1. And a connection flange portion 42 provided at the lower end of the inlet pipe 41 for connection to the.

【００２３】本考案の実施例は以上のように構成されており、消音器２１をルーツブロワ１に接続してルーツブロワ１が作動されると、空気はフィルタ部２４から吸引され、尾管３６、共鳴管３３、内管２９、入口管４１を通じてルーツブロワ１側に吸い込まれる。The embodiment of the present invention is configured as described above. When the muffler 21 is connected to the roots blower 1 and the roots blower 1 is operated, air is sucked from the filter portion 24, the tail pipe 36, and the resonance. It is sucked to the roots blower 1 side through the pipe 33, the inner pipe 29, and the inlet pipe 41.

【００２４】この際、ルーツブロワ１側から出た流体音等の騒音は、初めに膨張形消音器部２３ａに入り、この長さによって決まる基本周波数およびその奇数倍の、ルーツブロワ１から出る音のうち主に高周波数成分が消音される。At this time, the noise such as the fluid sound emitted from the Roots blower 1 side first enters the expansion silencer portion 23a, and the sound emitted from the Roots blower 1 of the fundamental frequency determined by this length and an odd multiple thereof. Of these, high frequency components are mainly muted.

【００２５】次に、目的とする低周波数の音に共鳴周波数が一致するように設計された共鳴形消音器部２３ｂに入り、低周波数成分が消音される。この場合、共鳴形消音器部２３ｂに到達する前に、膨張形消音器部２３ａを通過することで、音波がその軸方向のみに伝わる平面波に近くなり、設計された目的とする共鳴周波数の音が共鳴形消音器部２３ｂによって効率よく消音される。Next, the low frequency component is silenced by entering the resonance type silencer unit 23b designed so that the resonance frequency matches the target low frequency sound. In this case, by passing through the expansion type silencer portion 23a before reaching the resonance type silencer portion 23b, the sound wave becomes close to a plane wave transmitted only in its axial direction, and the sound of the designed target resonance frequency is obtained. Is effectively silenced by the resonance type silencer portion 23b.

【００２６】以上のように、音源からでる音のうち、低周波数の音に対しては、長さが短く構成できる共鳴形消音器部２３ｂで消音し、高周波数の音に対しては、膨張形消音器部２３ａで消音する構成としているため、膨張形消音器部２３ａも比較的短く構成でき、ここに、消音性能を確保しつつ、よりコンパクトな消音器２１を構成することができる。As described above, among the sounds emitted from the sound source, low-frequency sounds are silenced by the resonance-type silencer unit 23b which can be configured to have a short length, and high-frequency sounds are expanded. Since the muffler portion 23a is configured to mute the sound, the expansion muffler portion 23a can be configured to be relatively short, and a more compact muffler 21 can be configured while ensuring the muffling performance. it can.

【００２７】また、膨脹形消音器は内管の長さが長い程、消音性能が良好となるため、膨脹形消音器部２３ａに連続して共鳴形消音器部２３ｂが接続されていることにより、結果的に膨脹形消音器部２３ａの内管２９が長くなったのと同じ状態となって、膨脹形消音器部２３ａの消音性能も良好となる。Further, in the expansion-type silencer, the longer the length of the inner pipe, the better the sound-deadening performance. Therefore, the resonance-type silencer part 23b is connected to the expansion-type silencer part 23a continuously. As a result, the same state as when the inner tube 29 of the expansion type silencer portion 23a becomes long is obtained, and the muffling performance of the expansion type silencer portion 23a also becomes good.

【００２８】次に、具体的実施例について説明すると、図２に示される本考案の実施例における消音器２１の各部分の寸法を、入口管４１の内径Ｒ１＝６０ｍｍ、外筒２６の内径Ｒ２＝１８０ｍｍ、尾管３６の内径Ｒ３＝６０ｍｍ、入口管４１の軸方向長さＬ１＝８０ｍｍ、膨張形消音器部２３ａの軸方向長さＬ２＝２５０ｍｍ、共鳴形消音器部２３ｂの軸方向長さＬ３＝２３ｍｍ、尾管３６の軸方向長さＬ４＝８０ｍｍとした場合、図３に示されるような挿入損失と周波数の関係のデータが得られた。なお、図中、実線は計算値である。Explaining a concrete example, the size of each part of the silencer 21 in the example of the present invention shown in FIG. 2 is determined by the inner diameter R1 of the inlet pipe 41 = 60 mm and the outer cylinder 26. Inner diameter R2 = 180 mm, inner diameter R3 of tail pipe 36 = 60 mm, axial length L1 of inlet pipe 41 = 80 mm, axial length L2 = 250 mm of expansion silencer 23a, axis of common silencer 23b When the directional length L3 = 23 mm and the axial length L4 of the tail tube 36 = 80 mm, the data of the relationship between the insertion loss and the frequency as shown in FIG. 3 was obtained. In the figure, the solid line is the calculated value.

【００２９】また、図４に示される従来例における膨張形消音器３の各部分の寸法を、入口管８の内径Ｒ１１＝８０ｍｍ、外筒４の内径Ｒ１２＝１８０ｍｍ、内管７の内径Ｒ１３＝６０ｍｍ、入口管８の軸方向長さＬ１１＝８０ｍｍ、膨張形消音器部１５の軸方向長さＬ１２＝４２７ｍｍ、内管７の上方突出部の軸方向長さＬ１３＝６０ｍｍとした場合、図５に示されるような挿入損失と周波数の関係のデータが得られた。なお、図中、実線は計算値である。Further, the dimensions of each part of the expansion silencer 3 in the conventional example shown in FIG. 4 are as follows: inner diameter R11 of inlet pipe 8 = 80 mm, inner diameter R12 of outer cylinder 4 = 180 mm, inner diameter R13 of inner pipe 7 = 60 mm, the axial length L11 of the inlet pipe 8 = 80 mm, the axial length L12 of the expansion silencer part 15 = 427 mm, and the axial length L13 of the upward protrusion of the inner pipe 7 L60 = 60 mm. The data of the relationship between the insertion loss and the frequency as shown in 5 were obtained. In the figure, the solid line is the calculated value.

【００３０】以上のように、本具体的実施例における消音器２１にあっては、設計した目的とする共鳴周波数域（図３における周波数２２０Ｈｚ前後）において、大きな挿入損失が得られており、ここに、消音器２１の全長が従来の膨張形消音器３より短くても特定の周波数の音を効率よく消音でき、消音性能が同等以上のものが得られることがわかる。As described above, in the silencer 21 according to this specific example, a large insertion loss is obtained in the designed target resonance frequency range (around 220 Hz in FIG. 3), Here, it can be seen that even if the total length of the muffler 21 is shorter than that of the conventional expandable muffler 3, the sound of a specific frequency can be effectively muffled, and the muffling performance equal to or higher than that can be obtained.

【００３１】なお、膨張形消音器部２３ａや共鳴形消音器部２３ｂの長さは、消音を希望する周波数に応じて適宜設定すればよい。It should be noted that the lengths of the expansion silencer portion 23a and the resonance silencer portion 23b may be appropriately set according to the frequency at which silencing is desired.

【００３２】[0032]

【考案の効果】[Effect of device]

以上のように、本考案の消音器によれば、音源側に接続状とされる消音器の接続部に近い方に膨張形消音器部が備えられ、該膨張形消音器部に続いて共鳴形消音器部が備えられてなるものであり、低周波数の音に対しては、膨張形消音器に比較して長さが短く構成できる共鳴形消音器部で消音でき、他の周波数の音に対しては、膨張形消音器部で消音できるため、消音性能を確保しつつ、よりコンパクトに製作できる。また、音源に近い方に膨張形消音器部が配置され、遠い方に共鳴形消音器部が配置されているため、音源からの音が共鳴形消音器部に入るまでに、軸方向のみに伝わる平面波に近くなり、目的とする共鳴周波数の音が共鳴形消音器部によって効率よく消音できる利点がある。 As described above, according to the silencer of the present invention, the expansion silencer is provided near the connection part of the silencer connected to the sound source side, and the expansion silencer is connected to the expansion silencer. It is equipped with a resonance-type silencer.For low frequency sounds, the resonance-type silencer, which has a shorter length than the expansion-type silencer, can be used to muffle other frequencies. The expansion muffler can muffle the sound of the sound, so it can be manufactured more compactly while ensuring the muffling performance. Also, since the expansion silencer is located closer to the sound source and the resonance silencer is located farther away, the sound from the sound source enters the resonance silencer only in the axial direction. It has the advantage that it becomes close to the plane wave that is transmitted to, and the sound of the target resonance frequency can be effectively silenced by the resonance silencer section.

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

【図１】本考案の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

【図２】本考案の具体的実施例における説明図である。FIG. 2 is an explanatory diagram of a specific embodiment of the present invention.

【図３】同具体的実施例における周波数と挿入損失の関
係図である。FIG. 3 is a relationship diagram between frequency and insertion loss in the same specific example.

【図４】従来例の具体的実施例における説明図である。FIG. 4 is an explanatory diagram of a specific example of a conventional example.

【図５】同具体的実施例における周波数と挿入損失の関
係図である。FIG. 5 is a relationship diagram between frequency and insertion loss in the same specific example.

【図６】ルーツブロワと膨張形消音器との連結状態を示
す説明図である。FIG. 6 is an explanatory view showing a connected state of a roots blower and an expansion silencer.

【図７】従来例を示す断面図である。FIG. 7 is a cross-sectional view showing a conventional example.

【符号の説明】[Explanation of symbols]

１ルーツブロワ２吸込部２１消音器２２接続部２３消音部２３ａ膨張形消音器部２３ｂ共鳴形消音器部２４フィルタ部２４ａ外フィルタ受け２４ｂ内フィルタ受け２４ｃフィルタ２６外筒２７端板２８端板２９内管３０吸音材３１外筒３２端板３３共鳴管３３ａ共鳴孔３４共鳴室３６尾管３９押え板４１入口管４２接続フランジ部 1 Roots blower 2 Suction part 21 Silencer 22 Connection part 23 Silencing part 23a Expansion type silencer part 23b Resonance type silencer part 24 Filter part 24a Outer filter receiver 24b Inner filter receiver 24c Filter 26 Outer cylinder 27 End plate 28 End plate 29 Inside Tube 30 Sound absorbing material 31 Outer cylinder 32 End plate 33 Resonance tube 33a Resonance hole 34 Resonance chamber 36 Tail tube 39 Holding plate 41 Inlet tube 42 Connection flange part

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

【請求項１】音源側に接続状とされる消音器の接続部
に近い方に膨張形消音器部が備えられ、該膨張形消音器
部に続いて共鳴形消音器部が備えられてなることを特徴
とする消音器。1. An expansion type silencer portion is provided near a connection portion of a silencer connected to a sound source side, and a resonance silencer portion is provided following the expansion type silencer portion. A muffler characterized by that.