JP2000356120A - Standing wave preventing device for pipe - Google Patents
Standing wave preventing device for pipeInfo
- Publication number
- JP2000356120A JP2000356120A JP11167449A JP16744999A JP2000356120A JP 2000356120 A JP2000356120 A JP 2000356120A JP 11167449 A JP11167449 A JP 11167449A JP 16744999 A JP16744999 A JP 16744999A JP 2000356120 A JP2000356120 A JP 2000356120A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tube
- sound
- standing wave
- length
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
- Pipe Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車の排気管又
は吸気管のように、騒音が発生する管からの定在波を防
止する定在波防止装置に係り、特に、管長を自由に変化
し難い場所に使用される管の定在波防止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standing wave preventing device for preventing a standing wave from a noise-generating pipe such as an exhaust pipe or an intake pipe of a motor vehicle, and in particular, to freely changing a pipe length. The present invention relates to a standing wave prevention device for a pipe used in a difficult place.
【０００２】[0002]
【従来の技術】図１２に示すように音源から図１２
（ａ），（ｄ）のような均一のｄＢ値の音やピークのｄ
Ｂ値の音を発する音源からの音が管長Ｌの管１３に伝達
されると図１２（ｂ），（ｅ）に示すように管１３内で
音波が生じ、例えば低周波数の音が丁度管１３の管長Ｌ
の共鳴周波数と一致するといわゆる定在波が発生し、大
きなｄＢ値の騒音が生ずる。なお、この騒音の波形は前
記音源の音の形態（図１２（ａ），（ｄ））により異な
り、図１２（ｃ）や図１２（ｆ）に示すようなピーク値
が生ずる。なお、図１２（ｃ）の場合は１／２波長の倍
数で共鳴が起る。2. Description of the Related Art As shown in FIG.
(A) Sound of uniform dB value as in (d) and d of peak
When a sound from a sound source emitting a B-valued sound is transmitted to a tube 13 having a tube length L, a sound wave is generated in the tube 13 as shown in FIGS. 13 pipe lengths L
When the resonance frequency coincides with the resonance frequency, a so-called standing wave is generated, and noise having a large dB value is generated. The waveform of this noise differs depending on the form of the sound of the sound source (FIGS. 12A and 12D), and peak values as shown in FIGS. 12C and 12F are generated. In the case of FIG. 12C, resonance occurs at a multiple of a half wavelength.
【０００３】図１３（ａ）は同一形状，管長の管１４，
１５を並設した管体からなり、この管体に音源からの音
が伝達されると、図１２の場合と同様に、それぞれの管
１４，１５に図１３（ｂ）に示すような音波が生じ、管
１４，１５の排出側ではこれ等の音波が合体し図１３
（ｂ′）に示すような音波となって排出される。この場
合も前記音波の波長が管１４，１５の管長と一致すると
大きな定在波が生じ、図１３（ｃ）に示すように大きな
騒音レベルの音を発生させる。FIG. 13A shows a tube 14 having the same shape and length.
When a sound from a sound source is transmitted to this tube, a sound wave as shown in FIG. 13B is transmitted to each of the tubes 14 and 15 as in the case of FIG. At the discharge side of the tubes 14 and 15, these sound waves coalesce, and FIG.
The sound wave is emitted as shown in FIG. Also in this case, when the wavelength of the sound wave coincides with the tube length of the tubes 14 and 15, a large standing wave is generated, and a sound having a large noise level is generated as shown in FIG.
【０００４】[0004]
【発明が解決しようとする課題】図１４（ａ）は図１３
における不具合を解消させる目的で管１６及び管１６と
形状，管長の異なる管１７を並設せしめたものである。
この管１７は図１４（ｂ）に示すように管の排出側にお
ける音波の形態が丁度管１６の音波の形態の逆位相にな
るようにその形状，管長を設定したものからなる。この
ため、管１６，１７の脈動が相殺され、排出側では図１
４（ｂ′）に示すような音波となり、図１４（ｃ）に示
すように低い騒音レベルの音が排出される。しかしなが
ら、図１４（ａ）に示した構造の管体では、管１６は通
常のものであるが管１７が特殊な形状のものからなり、
管長も長くコスト高のものとなり、かつこれ等の管１
６，１７の配設場所によっては管１７が他の部材等と干
渉する恐れがあり、実際上使用することが難しい場合が
ある。FIG. 14 (a) is a diagram corresponding to FIG.
In order to solve the problem described above, the pipe 16 and the pipes 17 having different shapes and lengths from the pipe 16 are arranged side by side.
As shown in FIG. 14B, the shape and length of the tube 17 are set such that the form of the sound wave on the discharge side of the tube is exactly the opposite phase to the form of the sound wave of the tube 16. For this reason, the pulsation of the pipes 16 and 17 is offset, and at the discharge side, FIG.
The sound wave becomes as shown in FIG. 4 (b '), and a sound with a low noise level is emitted as shown in FIG. 14 (c). However, in the pipe body having the structure shown in FIG. 14A, the pipe 16 is of a normal shape but the pipe 17 is of a special shape.
The pipe length is long and expensive, and these pipes 1
Depending on the locations where the tubes 6 and 17 are disposed, the tube 17 may interfere with other members and the like, and it may be difficult to actually use the tube.
【０００５】一方、管体からの騒音を低減されるための
公知技術としては従来より各種のものがあるが、例え
ば、実開平６−５００９７号公報や特開平７−１８７５
５号公報が挙げられる。実開平６−５００９７号公報の
「騒音低減装置」は、エアクリーナとレゾネータを配置
する吸気管において、前記エアクリーナからＬ＝λ（２
Ｎ＋１）／４を満足する距離のところにレゾネータを配
置して吸気騒音の低減を図るものである。なお、λはレ
ゾレータの共振波長，Ｎは任意の自然数である。この公
知技術により吸気騒音は低減するが、この公知技術は一
般的なレゾネータによる減音機構であり、後に説明する
本発明のように管長を変えないで音波の形態を変える吸
音層部を用いるものとは構成において大きく相異するも
のである。また、特開平７−１８７５５号公報の「消音
器」は、吸音通路にこれから分岐するブランチ管を設
け、ブランチ管の共振を利用して消音効果を有するもの
であるが、前記のレゾネータと同様にブランチ管の取り
付け位置やその形状が特定され、自由度のある選択がで
きない問題点があり任意の場所にセットし難い場合も多
い。[0005] On the other hand, there are various conventional techniques for reducing the noise from the pipe body. For example, Japanese Unexamined Utility Model Publication No. Hei 6-50097 and Japanese Unexamined Patent Publication No. Hei 7-1875.
No. 5 publication. A “noise reduction device” disclosed in Japanese Utility Model Laid-Open Publication No. 6-50097 discloses an air intake pipe in which an air cleaner and a resonator are arranged.
A resonator is arranged at a distance satisfying (N + 1) / 4 to reduce intake noise. Here, λ is the resonance wavelength of the resonator, and N is an arbitrary natural number. Although the intake noise is reduced by this known technique, this known technique is a sound reduction mechanism using a general resonator, and uses a sound absorbing layer portion that changes the form of a sound wave without changing the pipe length as in the present invention described later. Is greatly different in configuration. Japanese Patent Application Laid-Open No. 7-18755 discloses a "silencer" in which a branch pipe is provided in a sound-absorbing passage, and has a noise-reducing effect by utilizing resonance of the branch pipe. The mounting position and the shape of the branch pipe are specified, and there is a problem in that the branch pipe cannot be freely selected, and it is often difficult to set the branch pipe at an arbitrary place.
【０００６】本発明は、以上の事情に鑑みて発明された
ものであり、管長を変えることなく、管体の「みかけ管
長」を変えて管長と波長との合致による定在波の発生を
防止し、騒音を低減する管の定在波防止装置を提供する
ことを目的とする。The present invention has been made in view of the above circumstances, and prevents the generation of a standing wave due to the match between the tube length and the wavelength by changing the "apparent tube length" of the tube without changing the tube length. It is another object of the present invention to provide a standing wave preventing device for a pipe that reduces noise.
【０００７】[0007]
【課題を解決するための手段】本発明は、以上の目的を
達成するために、管内に生ずる音波の波長が管長の共鳴
周波数に一致した際に発生する定在波（共鳴）を管長を
変えることなく防止する防止装置であって、該装置は、
管路内に音波に接する吸音層部を設ける管の定在波防止
装置を構成するものである。更に具体的に、前記管が、
単一の管体からなることを特徴とする。また、前記管
が、複数本の管体又は管路の並設したものからなり、前
記管体又は管路の少なくとも１つに前記吸音層部を設け
ることを特徴とする。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention changes the length of a standing wave (resonance) generated when the wavelength of a sound wave generated in a tube coincides with the resonance frequency of the length of the tube. Prevention device for preventing without
This device constitutes a standing wave preventing device for a pipe in which a sound absorbing layer portion in contact with a sound wave is provided in a pipe. More specifically, said tube is
It is characterized by comprising a single tube. Further, the pipe is composed of a plurality of pipes or pipes arranged in parallel, and the sound absorbing layer is provided on at least one of the pipes or pipes.
【０００８】管路の途中に管内の音波に接する吸音層部
を設けることにより管内の音波の形態が変わり、管長を
変えるのとほぼ同一の効果が生ずる。このため、管内の
音波の波長と管長の共鳴周波数との一致が回避され、定
在波の発生がなくなる。これにより、大幅な騒音防止効
果を上げることができる。By providing a sound absorbing layer portion in contact with the sound wave in the pipe in the middle of the pipe, the form of the sound wave in the pipe changes, and almost the same effect as changing the length of the pipe occurs. For this reason, the coincidence between the wavelength of the sound wave in the tube and the resonance frequency of the tube length is avoided, and the generation of a standing wave is eliminated. As a result, a significant noise prevention effect can be achieved.
【０００９】[0009]
【発明の実施の形態】以下、本発明の管の定在波防止装
置の実施の形態を図面を参照して詳述する。図１は単一
の管からなる管体の場合であり、図２は２本の管からな
る管体の場合である。勿論、管体は２本の管に限定する
ものではない。図６（ａ），（ｂ）に示すように、両端
開放の場合で説明すると管長Ｌの管１ｃに音源１８から
の音が導入されると管１ｃ内の管路７には図示のような
波長の共鳴が生ずる。図示のようにこの音波の１／２波
長が管１ｃの管長Ｌの倍数と一致すると定在波（共鳴）
が発生し、大きな騒音レベルの音が排出される。これを
防止するには、図７に示すように、例えば図６の管体１
ｃよりもλ／４（λは音波の波長）だけ管長の長い管１
ｄを用い、入力波長が管長の共鳴周波数と一致しない位
置にくるようにすれば定在波は発生しない。しかしなが
ら、この対策では管長が長くなり、スペース的にもコス
ト的にも問題である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a standing wave preventing device for a pipe according to an embodiment of the present invention. FIG. 1 shows the case of a tube composed of a single tube, and FIG. 2 shows the case of a tube composed of two tubes. Of course, the tube is not limited to two tubes. As shown in FIGS. 6A and 6B, in the case where both ends are open, when a sound from the sound source 18 is introduced into the tube 1c having the length L, the pipe line 7 in the tube 1c is as shown in the drawing. Wavelength resonance occurs. As shown in the figure, when a half wavelength of this sound wave matches a multiple of the tube length L of the tube 1c, a standing wave (resonance).
Is generated and a sound with a large noise level is emitted. To prevent this, for example, as shown in FIG.
tube 1 having a tube length longer than c by λ / 4 (λ is the wavelength of the sound wave)
If the input wavelength is set at a position that does not match the resonance frequency of the tube length using d, no standing wave is generated. However, this measure increases the length of the pipe, and is problematic in terms of space and cost.
【００１０】本発明は、図６（ａ），（ｂ）の管１ｃと
同一の管長を保持したまま定在波をなくすものであり、
図１（ａ），（ｂ）にその構造が示されている。この定
在波防止装置１００は、管長Ｌの管１を前記図６に示し
た管１ｃと同径の管部４と拡径管部３とを設けたものか
ら形成する。拡径管部３内には吸音層部２が充填され
る。以上により、管１の管内には図６に示した管１ｃと
同一内径の管路７が形成される。なお、吸音層部２の収
納される拡径管部３の外径は特に余り大きくする必要は
ないためその周辺の部材との干渉はほとんど考慮する必
要はない。また、吸音層部２としては特に材質等を限定
する必要はないが、吸音性のある材質、例えば、ガラス
ウールが用いられる。勿論、これに限定するものではな
い。The present invention eliminates standing waves while maintaining the same tube length as the tube 1c in FIGS. 6 (a) and 6 (b).
1 (a) and 1 (b) show the structure. In this standing wave prevention device 100, a tube 1 having a tube length L is formed from a tube provided with a tube portion 4 having the same diameter as the tube 1c shown in FIG. The sound absorbing layer 2 is filled in the enlarged diameter tube 3. As described above, a pipe 7 having the same inner diameter as the pipe 1c shown in FIG. The outer diameter of the enlarged-diameter tube portion 3 in which the sound-absorbing layer portion 2 is housed does not need to be particularly large, so that there is almost no need to consider interference with surrounding members. The material of the sound absorbing layer 2 is not particularly limited, but a material having a sound absorbing property, for example, glass wool is used. Of course, it is not limited to this.
【００１１】以上の構造の管１内に音源１８からの音が
入口５から導入されると、吸音層部２がない場合は図６
のような形態の音波が導入され定在波が発生するが、本
実施の形態のように管１の中間部に吸音層部２があると
音波は吸音層部２の通過時に同じ周波数でありながら波
長が短くなる。この特性を利用し吸音層の長さを工夫す
ることにより、図１（ａ），（ｂ）に示すように管１の
出口６における音波の形態が同じ共鳴周波数でありなが
ら図示のようにすることができる。以上により、音波の
波長が管１の共鳴管長Ｌと一致せず定在波の発生が防止
される。以上のように、管１の管長を全く変えることな
く、その「みかけ管長」を図７に示したものと同一にす
ることが可能になり、定在波が確実に防止される。な
お、実験例として管長Ｌが３０ｃｍの管が定在波をなく
すためには６０ｃｍにする必要があったが３０ｃｍのま
まで中間部にガラスウールの吸音層部２を設けるだけで
定在波の発生がなくなり、騒音レベルが大幅に低下した
ことが実証された。When the sound from the sound source 18 is introduced from the inlet 5 into the tube 1 having the above-described structure, if the sound absorbing layer 2 is not provided, FIG.
When a sound absorbing layer 2 is provided at an intermediate portion of the tube 1 as in the present embodiment, the sound wave has the same frequency when passing through the sound absorbing layer 2. However, the wavelength becomes shorter. By utilizing this characteristic and devising the length of the sound absorbing layer, as shown in FIGS. 1A and 1B, the sound waves at the outlet 6 of the tube 1 have the same resonance frequency but have the same resonance frequency as shown in the figure. be able to. As described above, the wavelength of the sound wave does not match the resonance tube length L of the tube 1 and the generation of a standing wave is prevented. As described above, it is possible to make the “apparent tube length” the same as that shown in FIG. 7 without changing the tube length of the tube 1 at all, and the standing wave is reliably prevented. As an experimental example, a tube having a tube length L of 30 cm had to be set to 60 cm in order to eliminate the standing wave. Emissions disappeared, demonstrating that the noise level was significantly reduced.
【００１２】図１（ａ），（ｂ）は単一の管１を用いた
場合であるが、図２の定在波防止装置１００ａは２本の
管１Ａ，１Ｂからなる管体１ａを用いたものである。管
１Ａ，管１Ｂは並設され、管１Ａの吸音層部２ａを除い
た場合には両者は同一形状のものからなる。管１Ａ，管
１Ｂの入口側は合体し管１Ｃを形成し、出口側も合体し
管１Ｄを形成する。管１Ａの中間部には拡径管部３ａが
形成され、拡径管部３ａ内には吸音層部２ａが充填され
る。以上により、管１Ｂ及び管１Ａには管路８及び管路
９が形成されるが、この両者は見かけ上は同一形状のも
のからなる。FIGS. 1 (a) and 1 (b) show a case where a single tube 1 is used. The standing wave preventing device 100a shown in FIG. 2 uses a tube 1a composed of two tubes 1A and 1B. It was what was. The tube 1A and the tube 1B are provided side by side, and when the sound absorbing layer 2a of the tube 1A is removed, both have the same shape. The inlet sides of the tubes 1A and 1B are combined to form a tube 1C, and the outlet sides are also combined to form a tube 1D. An enlarged-diameter tube portion 3a is formed in an intermediate portion of the tube 1A, and the inside of the enlarged-diameter tube portion 3a is filled with a sound absorbing layer portion 2a. Thus, the pipes 8 and 9 are formed in the pipes 1B and 1A, both of which are apparently of the same shape.
【００１３】図８及び図１０（ａ）は図２における管１
Ｂの管路８内に発生している音波を示す。この場合は図
示のように波長と管長の共鳴周波数が一致するためこの
ままでは定在波が発生する。一方、図９及び図１０
（ｂ）は図２の管１Ａ内の音波を示すもので、この管路
９内に生ずる音波は吸音層部２ａの影響により図示のよ
うに波長が変化し、定在波が発生しない形態になる。従
って、管１Ｂと管１Ａの合体する管１Ｄの部分では管１
Ｂと管１Ａとに発生している音波が互いに干渉し、図１
０（ｃ）のような波形となり、結果として定在波の発生
が防止される。図１１は周波数と騒音レベルとの関係を
示す線図であるが、図示のように吸音層部２ａを用いな
い場合の騒音レベル（点線で示す）が実線のように大幅
に低減する。特に、低周波数の部分で大幅の騒音レベル
の低減が見られる。以上のように、複数管の場合でも図
１４に示したような複雑な形状の管を用いることなく、
管長を変えることなく定在波の発生を防止することがで
きる。FIGS. 8 and 10 (a) show the tube 1 in FIG.
7A shows a sound wave generated in the pipeline 8 of FIG. In this case, since the wavelength and the resonance frequency of the tube length match as shown, a standing wave is generated as it is. 9 and 10
(B) shows the sound wave in the pipe 1A of FIG. 2, and the sound wave generated in the pipe 9 changes in wavelength as shown in the figure due to the influence of the sound absorbing layer 2a, and does not generate a standing wave. Become. Therefore, at the part of the tube 1D where the tube 1B and the tube 1A are united, the tube 1
B and the sound waves generated in the tube 1A interfere with each other, and FIG.
The waveform becomes like 0 (c), and as a result, generation of a standing wave is prevented. FIG. 11 is a diagram showing the relationship between the frequency and the noise level. The noise level (indicated by a dotted line) when the sound absorbing layer 2a is not used as shown in FIG. In particular, a significant reduction in the noise level is seen in the low frequency part. As described above, even in the case of a plurality of tubes, without using a tube having a complicated shape as shown in FIG.
The generation of standing waves can be prevented without changing the pipe length.
【００１４】図２は２本の管１Ｂ，１Ａを並設した管１
ａの場合であるが、図３は２つの管路１０，１１を内部
に設けた管体１ｂを用いた定在波防止装置１００ｂを示
す。図３，図４，図５に示すように管体１ｂは中間板１
２で区切られる拡径管部１Ａ′，１Ｂ′と、この前後に
連結される管１Ｃ′，管１Ｄ′とからなる。拡径管部１
Ａ′の内部には吸音層部２ｂが充填され管路１０を形成
している。以上の構造により、管路１０と管路１１を通
る音波の波長の形態が前記の場合と同様に変わり、逆位
相化され、定在波の形成がなくなる。以上により、前記
と同様の騒音防止効果が上げられる。FIG. 2 shows a tube 1 in which two tubes 1B and 1A are juxtaposed.
As shown in FIG. 3A, FIG. 3 shows a standing wave prevention device 100b using a tubular body 1b having two pipelines 10 and 11 provided therein. As shown in FIG. 3, FIG. 4 and FIG.
It is composed of enlarged diameter pipe sections 1A 'and 1B' divided by 2, and pipes 1C 'and 1D' connected before and after this section. Expanded tube section 1
The inside of A 'is filled with the sound absorbing layer portion 2b to form the conduit 10. With the above structure, the form of the wavelength of the sound wave passing through the pipes 10 and 11 is changed in the same manner as in the above case, the phases are reversed, and the formation of standing waves is eliminated. As described above, the same noise prevention effect as described above can be obtained.
【００１５】以上の説明によって明らかなように、本発
明の管の定在波防止装置は単一の管体，複数の管体に拘
らず、その管長を変えることなく定在波の発生が防止さ
れる。そのため、管体と他の部材との干渉もなく、高コ
ストの形状の管構造が不要であり、挿着の容易化と低コ
スト化が図れる。なお、吸音層部２，２ａ，２ｂ等はガ
ラスウールを始め音波を吸収し得る任意の公知部材でよ
く、特別な装備も必要としない。そのため、安価に実施
できる。As is apparent from the above description, the standing wave preventing apparatus for a pipe according to the present invention prevents the generation of standing waves without changing the length of a single pipe or a plurality of pipes. Is done. Therefore, there is no interference between the tube and other members, and a tube structure having a high cost is not required, so that insertion can be facilitated and cost can be reduced. The sound absorbing layer portions 2, 2a, 2b, etc. may be any known member capable of absorbing sound waves, such as glass wool, and do not require special equipment. Therefore, it can be implemented at low cost.
【００１６】[0016]
【発明の効果】本発明の管の定在波防止装置によれば、
単一及び複数の管体から発する定在波に基づく騒音が、
管長を変えることなく低減でき、かつ容易に、かつ安価
に実施できる効果が上げられる。According to the standing wave preventing device for a pipe of the present invention,
Noise based on standing waves emanating from single and multiple tubes,
The effect can be reduced without changing the pipe length, and can be easily and inexpensively implemented.
【図１】本発明の定在波防止装置の一実施の形態の構造
を示す模式的断面図。FIG. 1 is a schematic cross-sectional view showing a structure of an embodiment of a standing wave prevention device of the present invention.
【図２】２本の管からなる定在波防止装置の構造を示す
模式的断面図。FIG. 2 is a schematic cross-sectional view showing a structure of a standing wave prevention device including two tubes.
【図３】２つの管路からなる定在波防止装置の構造を示
す模式的断面図。FIG. 3 is a schematic cross-sectional view showing a structure of a standing wave prevention device including two conduits.
【図４】図３のＡ−Ａ線拡大断面図。FIG. 4 is an enlarged sectional view taken along line AA of FIG. 3;
【図５】図３のＢ−Ｂ線拡大断面図。FIG. 5 is an enlarged sectional view taken along line BB of FIG. 3;
【図６】従来の単一の管における定在波の発生状態を説
明する模式的断面図。FIG. 6 is a schematic cross-sectional view illustrating a state of generation of a standing wave in a conventional single tube.
【図７】図６における定在波の発生防止のための解決手
段の１つを示す模式的断面図。FIG. 7 is a schematic cross-sectional view showing one of means for solving the problem of standing wave generation in FIG. 6;
【図８】図２における管１Ｂ内の音波の形態を示す模式
的断面図。FIG. 8 is a schematic cross-sectional view showing a form of a sound wave in a tube 1B in FIG.
【図９】図２における管１Ａ内の音波の形態を示す模式
的断面図。FIG. 9 is a schematic cross-sectional view showing a form of a sound wave in the tube 1A in FIG.
【図１０】図２の定在波の低減効果を説明するための模
式的線図。FIG. 10 is a schematic diagram for explaining the effect of reducing the standing wave in FIG. 2;
【図１１】図２の定在波防止装置と従来の管体における
騒音レベルの周波数の比較を示す線図。FIG. 11 is a diagram showing a comparison of noise level frequencies between the standing wave prevention device of FIG. 2 and a conventional pipe body.
【図１２】従来の単一の管体内の音波と騒音レベルを示
す模式図。FIG. 12 is a schematic diagram showing sound waves and noise levels in a single conventional tube.
【図１３】２本の管からなる従来の管体内の音波と騒音
レベルを示す模式図。FIG. 13 is a schematic diagram showing sound waves and noise levels in a conventional pipe body composed of two pipes.
【図１４】図１３における管体の定在波低減手段の１つ
を示す模式図。FIG. 14 is a schematic view showing one of the standing wave reducing means of the tubular body in FIG.
１ 管 １ａ 管 １ｂ 管 １Ａ 管 １Ａ′ 管 １Ｂ 管 １Ｂ′ 管 １Ｃ 管 １Ｃ′ 管 １Ｄ 管 １Ｄ′ 管 ２ 吸音層部 ２ａ 吸音層部 ２ｂ 吸音層部 ３ 拡径管部 ３ａ 拡径管部 ４ 管部 ５ 入口 ６ 出口 ７ 管路 ８ 管路 ９ 管路 １０ 管路 １１ 管路 １２ 中間板 １８ 音源 １００ 定在波防止装置 １００ａ 定在波防止装置 １００ｂ 定在波防止装置 DESCRIPTION OF SYMBOLS 1 pipe 1a pipe 1b pipe 1A pipe 1A 'pipe 1B pipe 1B' pipe 1C pipe 1C 'pipe 1D pipe 1D' pipe 2 Sound absorbing layer part 2a Sound absorbing layer part 2b Sound absorbing layer part 3 Large diameter tube part 3a Large diameter tube part 4 Part 5 Inlet 6 Outlet 7 Pipe 8 Pipe 9 Pipe 10 Pipe 11 Pipe 12 Intermediate plate 18 Sound source 100 Standing wave prevention device 100a Standing wave prevention device 100b Standing wave prevention device
Claims (3)
波数に一致した際に発生する定在波（共鳴）を管長を変
えることなく防止する防止装置であって、該装置は、管
路内に音波に接する吸音層部を設けることを特徴とする
管の定在波防止装置。An apparatus for preventing a standing wave (resonance) generated when a wavelength of a sound wave generated in a pipe coincides with a resonance frequency of the pipe length without changing the pipe length. A standing wave preventing device for a pipe, wherein a sound absorbing layer portion in contact with a sound wave is provided on the tube.
に記載の管の定在波防止装置。2. The tube according to claim 1, wherein said tube comprises a single tube.
3. The standing wave prevention device for a pipe according to claim 1.
したものからなり、前記管体又は管路の少なくとも１つ
に前記吸音層部を設けることを特徴とする請求項１に記
載の管の定在波防止装置。3. The pipe according to claim 1, wherein the pipe comprises a plurality of pipes or pipes arranged in parallel, and the sound absorbing layer is provided on at least one of the pipes or pipes. 3. The standing wave prevention device for a pipe according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11167449A JP2000356120A (en) | 1999-06-14 | 1999-06-14 | Standing wave preventing device for pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11167449A JP2000356120A (en) | 1999-06-14 | 1999-06-14 | Standing wave preventing device for pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000356120A true JP2000356120A (en) | 2000-12-26 |
Family
ID=15849915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11167449A Pending JP2000356120A (en) | 1999-06-14 | 1999-06-14 | Standing wave preventing device for pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000356120A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7111601B2 (en) * | 2004-03-18 | 2006-09-26 | Visteon Global Technologies, Inc. | Air induction system having an environmentally resistant acoustic membrane |
| CN102230408A (en) * | 2011-06-27 | 2011-11-02 | 胡洪霞 | Mixed silencer |
| JP2016183844A (en) * | 2015-03-26 | 2016-10-20 | 大阪瓦斯株式会社 | Thermoacoustic engine |
| JPWO2016056077A1 (en) * | 2014-10-08 | 2017-04-27 | 三菱電機株式会社 | Expansion valve and refrigeration cycle apparatus using expansion valve |
| CN107223033A (en) * | 2014-12-26 | 2017-09-29 | 三星电子株式会社 | Vacuum cleaner and its control method |
| JP2018138822A (en) * | 2018-04-12 | 2018-09-06 | 三菱電機株式会社 | Expansion valve and refrigeration cycle device using expansion valve |
-
1999
- 1999-06-14 JP JP11167449A patent/JP2000356120A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7111601B2 (en) * | 2004-03-18 | 2006-09-26 | Visteon Global Technologies, Inc. | Air induction system having an environmentally resistant acoustic membrane |
| CN102230408A (en) * | 2011-06-27 | 2011-11-02 | 胡洪霞 | Mixed silencer |
| JPWO2016056077A1 (en) * | 2014-10-08 | 2017-04-27 | 三菱電機株式会社 | Expansion valve and refrigeration cycle apparatus using expansion valve |
| CN106795981A (en) * | 2014-10-08 | 2017-05-31 | 三菱电机株式会社 | Expansion valve and the refrigerating circulatory device using expansion valve |
| EP3205916A4 (en) * | 2014-10-08 | 2018-05-09 | Mitsubishi Electric Corporation | Expansion valve, and refrigeration cycle device using expansion valve |
| US10401065B2 (en) | 2014-10-08 | 2019-09-03 | Mitsubishi Electric Corporation | Expansion valve, and refrigeration cycle system using expansion valve |
| CN107223033A (en) * | 2014-12-26 | 2017-09-29 | 三星电子株式会社 | Vacuum cleaner and its control method |
| CN107223033B (en) * | 2014-12-26 | 2021-01-26 | 三星电子株式会社 | Vacuum cleaner and control method for the same |
| JP2016183844A (en) * | 2015-03-26 | 2016-10-20 | 大阪瓦斯株式会社 | Thermoacoustic engine |
| JP2018138822A (en) * | 2018-04-12 | 2018-09-06 | 三菱電機株式会社 | Expansion valve and refrigeration cycle device using expansion valve |
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