JPS6226576Y2 - - Google Patents
Info
- Publication number
- JPS6226576Y2 JPS6226576Y2 JP18453781U JP18453781U JPS6226576Y2 JP S6226576 Y2 JPS6226576 Y2 JP S6226576Y2 JP 18453781 U JP18453781 U JP 18453781U JP 18453781 U JP18453781 U JP 18453781U JP S6226576 Y2 JPS6226576 Y2 JP S6226576Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- sound absorber
- porous sound
- internal combustion
- porous
- 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.)
- Expired
Links
- 239000006096 absorbing agent Substances 0.000 claims description 38
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 230000030279 gene silencing Effects 0.000 claims description 7
- 230000003584 silencer Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011358 absorbing material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
この考案は多孔質吸音体の目詰り防止構造を備
えた内燃機関用排気消音装置に関するものであ
る。[Detailed Description of the Invention] This invention relates to an exhaust muffling device for an internal combustion engine that has a structure to prevent clogging of a porous sound absorber.
一般に、内燃機関においては、排気音の低減の
ため、排気消音装置が排気系の出口に設けられて
いるが、この排気消音装置は排気ガス流に対して
ある抵抗をもつため、内燃機関の背圧上昇を招
き、機関出力の低下を招来する。したがつて、内
燃機関においては、圧力損失が小さく、消音効果
の大きい排気用消音装置が望まれる。 Generally, in internal combustion engines, an exhaust silencing device is installed at the exit of the exhaust system to reduce exhaust noise, but since this exhaust silencing device has a certain resistance to the exhaust gas flow, it This results in an increase in pressure and a decrease in engine output. Therefore, for internal combustion engines, an exhaust muffling device with low pressure loss and high muffling effect is desired.
ここで、圧力損失を低減するには、まず装置内
の排気通路を直線的に形成しなければならない。
また、装置内の排気通路を直線的に配置して、所
要の消音性能を得るには、吸音材を用いる以外に
適正な手段はない。また、通常排気音は広い周波
数帯域のスペクトル音から構成されているので、
吸音材としても、広い周波数帯域に対処可能な吸
音力を有する多孔質吸音体が望ましい。 Here, in order to reduce pressure loss, the exhaust passage within the device must first be formed linearly.
Furthermore, in order to arrange the exhaust passage in the device in a straight line and obtain the required sound-dampening performance, there is no proper means other than using a sound-absorbing material. In addition, exhaust noise usually consists of spectrum sounds in a wide frequency band, so
As a sound absorbing material, a porous sound absorbing body having a sound absorbing power capable of dealing with a wide frequency band is desirable.
上記要請にしたがつて製造された従来の排気消
音装置として第1図に示すものが知られている。 As a conventional exhaust muffling device manufactured in accordance with the above requirements, the one shown in FIG. 1 is known.
第1図において、1は消音装置の筐体であり、
その前端部には排気入口管2が、後端部には排気
出口管3がそれぞれ接続されている。4は筐体1
内に収容された円筒形の多孔質吸音体であり、こ
の多孔質吸音体4の内部は吸音用排気通路5とし
て、上記排気入口管2と排気出口管3との間を直
線的に接続している。なお、排気入口管2、排気
出口管3の内径は吸音用排気通路5の直径とほぼ
同一である。 In FIG. 1, 1 is a housing of a silencer;
An exhaust inlet pipe 2 is connected to its front end, and an exhaust outlet pipe 3 is connected to its rear end. 4 is housing 1
A cylindrical porous sound absorber is housed inside the porous sound absorber 4, and the inside of the porous sound absorber 4 serves as a sound absorbing exhaust passage 5, which connects the exhaust inlet pipe 2 and the exhaust outlet pipe 3 in a straight line. ing. Note that the internal diameters of the exhaust inlet pipe 2 and the exhaust outlet pipe 3 are approximately the same as the diameter of the sound-absorbing exhaust passage 5.
上記構成において、内燃機関から排出された排
気ガスは、図中、実線矢印で示すように、排気入
口管2より多孔質吸音体4の吸音用排気通路5を
通り、排気出口管3より大気中に排出される。 In the above configuration, exhaust gas discharged from the internal combustion engine passes from the exhaust inlet pipe 2 through the sound-absorbing exhaust passage 5 of the porous sound absorber 4, and enters the atmosphere from the exhaust outlet pipe 3, as shown by the solid arrow in the figure. is discharged.
一方、排気ガスとともに内燃機関から放出され
た排気音も上記排気ガスと同様の経路を通つて大
気中に放射されるが、その間に音波が多孔質吸音
体4に吸収されることにより、排気出口管3から
大気中に放射される排気音が低減される。 On the other hand, the exhaust sound emitted from the internal combustion engine along with the exhaust gas is also radiated into the atmosphere through the same route as the exhaust gas, but during that time, the sound waves are absorbed by the porous sound absorber 4, and the sound waves are absorbed at the exhaust outlet. Exhaust noise radiated into the atmosphere from the pipe 3 is reduced.
しかし、上記構成においては、排気ガス中に含
有されるタールやカーボンなどが多孔質吸音体4
の表面に付着することにより、多孔質吸音体4が
目詰りを起こし、多孔質吸音体4への音波の侵入
が困難になり、吸音力が著しく低下する。 However, in the above configuration, tar, carbon, etc. contained in the exhaust gas are removed from the porous sound absorber 4.
By adhering to the surface of the porous sound absorber 4, the porous sound absorber 4 becomes clogged, making it difficult for sound waves to penetrate into the porous sound absorber 4, and the sound absorption power is significantly reduced.
したがつて、内燃機関の排気消音装置に多孔質
吸音体4を応用するには、タールやカーボンなど
が多孔質吸音体4の表面に付着しないように考慮
しなければならない。 Therefore, in order to apply the porous sound absorber 4 to an exhaust silencer for an internal combustion engine, consideration must be given to prevent tar, carbon, etc. from adhering to the surface of the porous sound absorber 4.
この考案は上記観点からなされたもので、内部
を排気ガスが通過する円筒形の多孔質吸音体を筐
体内に設け、上記筐体内の吸音体外周空間にエア
ポンプを接続し、このエアポンプで多孔質吸音体
の外周部から内周部へ空気流を通過させることに
より、タールやカーボンなどによる多孔質吸音体
の目詰りを防止し、長期間にわたつて安定した消
音効果を発揮する内燃機関用排気消音装置を提供
することを目的としている。 This idea was made from the above point of view. A cylindrical porous sound absorber through which exhaust gas passes is provided inside the housing, an air pump is connected to the outer space of the sound absorber inside the housing, and the air pump is used to absorb the porous sound absorber. An exhaust for internal combustion engines that prevents clogging of the porous sound absorber with tar, carbon, etc. by passing airflow from the outer periphery to the inner periphery of the sound absorber, and provides a stable sound damping effect over a long period of time. The purpose is to provide a silencer.
以下、この考案の実施例を図面にもとづいて説
明する。 Hereinafter, embodiments of this invention will be described based on the drawings.
第2図はこの考案の一実施例にかかる内燃機関
用排気消音装置の縦断側面図である。この図にお
いて、1は筐体であり、その前端部には排気入口
管2が、後端部には排気出口管3がそれぞれ接続
されている。4は筐体1内に収容された円筒形の
多孔質吸音体であり、この多孔質吸音体4の内部
は吸音用排気通路5として、上記排気入口管2と
排気出口管3との間を直線的に接続している。ま
た、上記筐体1内の吸音体外周空間6には、配管
7を介してエアポンプ8が接続されている。 FIG. 2 is a longitudinal sectional side view of an exhaust silencer for an internal combustion engine according to an embodiment of the invention. In this figure, reference numeral 1 denotes a housing, to which an exhaust inlet pipe 2 is connected to the front end, and an exhaust outlet pipe 3 is connected to the rear end. Reference numeral 4 denotes a cylindrical porous sound absorber housed in the casing 1, and the inside of the porous sound absorber 4 serves as a sound absorbing exhaust passage 5, which runs between the exhaust inlet pipe 2 and the exhaust outlet pipe 3. connected in a straight line. Further, an air pump 8 is connected to the sound absorber outer circumferential space 6 in the housing 1 via a pipe 7.
上記のように構成された排気消音装置におい
て、内燃機関(図示せず)から排出された排気ガ
ス(実線矢印)は排気入口管2より多孔質吸音体
4の吸音用排気通路5を通り、排気出口管3より
大気中に排出され、かつ排気音は多孔質吸音体4
に吸収される。このとき、エアポンプ8から筐体
1内の吸音体外周空間6に強制的に圧縮空気が供
給されることにより、上記吸音体外周空間6から
多孔質吸音体4をその外周から内周へ通過して吸
音用排気通路5へ到る空気流(点線矢印)が形成
される。排気ガス中に含有されたタールやカーボ
ンなどは上記多孔質吸音体4を通過する空気流に
よつて多孔質吸音体4への付着を阻止され、その
結果として、長期間にわたつて安定した消音効果
が得られる。 In the exhaust silencer configured as described above, exhaust gas (solid arrow) discharged from the internal combustion engine (not shown) passes from the exhaust inlet pipe 2 through the sound-absorbing exhaust passage 5 of the porous sound absorber 4, and is then exhausted to the exhaust gas. It is discharged into the atmosphere from the outlet pipe 3, and the exhaust sound is passed through the porous sound absorber 4.
absorbed into. At this time, compressed air is forcibly supplied from the air pump 8 to the sound absorber outer circumferential space 6 in the housing 1, so that the compressed air passes from the sound absorber outer circumferential space 6 to the porous sound absorber 4 from its outer circumference to its inner circumference. An air flow (dotted line arrow) is formed that reaches the sound absorbing exhaust passage 5. Tar, carbon, etc. contained in the exhaust gas are prevented from adhering to the porous sound absorber 4 by the air flow passing through the porous sound absorber 4, and as a result, stable sound deadening is achieved over a long period of time. Effects can be obtained.
第3図は1400c.c.乗用車にこの考案の排気用消音
装置を装着し、約1万Kmの実走行を行つた際の消
音性能の劣化を調整した結果である。図中、A曲
線は走行前の消音性能、B曲線は1万Kmの走行後
のそれを示す。走行後、若干の消音性能の劣化が
見られるが、ほとんど影響がない程度のものであ
る。消音装置の分解結果からも、多孔質吸音材表
面へのタールやカーボンの付着は僅かであつた。
図中、C曲線はエアポンプ8がない場合、つまり
第1図に示された従来例に相当する場合であり、
空気流の供給が断たれるため、タールやカーボン
などが吸音材に付着し、急激な消音性能の劣化が
見られた。 Figure 3 shows the results of adjusting for the deterioration in noise reduction performance when a 1400 c.c. passenger car was equipped with the exhaust noise reduction device of this invention and was driven for approximately 10,000 km. In the figure, curve A shows the noise reduction performance before driving, and curve B shows the noise reduction performance after driving for 10,000 km. After driving, there is a slight deterioration in the silencing performance, but it is of a negligible degree. The disassembly results of the silencer also showed that there was very little tar or carbon adhering to the surface of the porous sound absorbing material.
In the figure, the C curve is the case without the air pump 8, that is, the case corresponding to the conventional example shown in FIG.
Because the air flow was cut off, tar, carbon, and other substances adhered to the sound-absorbing material, causing a rapid deterioration of sound-absorbing performance.
第4図はこの考案の他の実施例を示す。この図
に示すように、多孔質吸音体4の排気出口部に接
続する排気出口管として、排気方向に拡がるラツ
パ状の拡大管9を設けることができる。この構成
では、拡大管9の入口部の排気速度が出口部での
それよりも大きくなり、多孔質吸音体4内の圧力
が低下することにより、エアポンプ8からの風量
を増大させることができる。 FIG. 4 shows another embodiment of this invention. As shown in this figure, as an exhaust outlet pipe connected to the exhaust outlet portion of the porous sound absorber 4, a trumpet-shaped expansion tube 9 expanding in the exhaust direction can be provided. With this configuration, the exhaust speed at the inlet of the expansion tube 9 becomes higher than that at the outlet, and the pressure inside the porous sound absorber 4 decreases, so that the air volume from the air pump 8 can be increased.
上記エアポンプ8は消音装置専用形に構成する
場合と、他の用途に用いるエアポンプとの共用形
に構成する場合とがある。第5図はこの考案の消
音装置10を乗用車11に装着した例を示し、こ
の例ではエアポンプ8は燃料噴射用のエアポンプ
と共用形に構成されている。 The air pump 8 may be configured exclusively for use as a silencer, or may be configured to be used in common with air pumps used for other purposes. FIG. 5 shows an example in which the silencer 10 of this invention is installed in a passenger car 11, and in this example, the air pump 8 is configured to be used in common with the air pump for fuel injection.
なお、この考案において使用することができる
多孔質吸音体としては、セラミツクもしくはガラ
スからなる多孔体、あるいは、発泡金属、金属繊
維もしくは無機繊維強化金属のような市販されて
いる金属多孔体がある。上記金属多孔体の材質と
しては、Ni,Cu,Al,Ni−Cr,Fe−Cr,Fe−
Ni−Cr,Fe−Cr−Al、Ni−Fe−Cr−Alなどが
適している。 Note that porous sound absorbers that can be used in this invention include porous bodies made of ceramic or glass, or commercially available porous metal bodies such as foamed metal, metal fibers, or inorganic fiber-reinforced metals. The materials of the above metal porous body include Ni, Cu, Al, Ni-Cr, Fe-Cr, Fe-
Ni-Cr, Fe-Cr-Al, Ni-Fe-Cr-Al, etc. are suitable.
以上説明したように、この考案によれば、内部
を排気ガスが通過する円筒形の多孔質吸音体を筐
体内に設け、上記筐体内の吸音体外周空間にエア
ポンプを接続し、このエアポンプで多孔質吸音体
の外周部から内周部へ空気流を通過させることに
より、タールやカーボンなどによる多孔質吸音体
の目詰りを防止し、長期間にわたつて安定した消
音効果を発揮する内燃機関用排気消音装置を提供
することができる。 As explained above, according to this invention, a cylindrical porous sound absorber through which exhaust gas passes is provided in a housing, an air pump is connected to the outer circumferential space of the sound absorber in the housing, and this air pump For internal combustion engines, it prevents clogging of the porous sound absorber with tar, carbon, etc. by passing airflow from the outer periphery to the inner periphery of the porous sound absorber, and provides a stable noise reduction effect over a long period of time. An exhaust silencer can be provided.
第1図は従来の内燃機関用排気消音装置の縦断
側面図、第2図はこの考案の一実施例にかかる内
燃機関用排気消音装置の縦断側面図、第3図は消
音特性図、第4図はこの考案の他の実施例を示す
縦断側面図、第5図はこの考案を乗用車に装着し
た例を示す概略図である。
1……筐体、4……多孔質吸音体、8……エア
ポンプ、9……拡大管。なお、図中、同一符号は
同一または相当部分を示す。
FIG. 1 is a longitudinal side view of a conventional exhaust silencing device for an internal combustion engine, FIG. 2 is a longitudinal sectional side view of an exhaust silencing device for an internal combustion engine according to an embodiment of this invention, FIG. 3 is a silencing characteristic diagram, and FIG. The figure is a longitudinal side view showing another embodiment of this invention, and FIG. 5 is a schematic diagram showing an example in which this invention is installed in a passenger car. 1... Housing, 4... Porous sound absorber, 8... Air pump, 9... Expansion tube. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
音体を筐体内に設け、上記筐体内の吸音体外周
空間にエアポンプを接続し、このエアポンプに
より上記多孔質吸音体の外周部から内周部へ空
気流を通過させるようにしたことを特徴とする
内燃機関用排気消音装置。 (2) 多孔質吸音体の排気出口部に排気方向にラツ
パ状に拡がる拡大管を設けた実用新案登録請求
の範囲第1項記載の内燃機関用排気消音装置。[Scope of Claim for Utility Model Registration] (1) A cylindrical porous sound absorber through which exhaust gas passes is provided in a housing, an air pump is connected to the outer circumferential space of the sound absorber in the housing, and this air pump 1. An exhaust muffling device for an internal combustion engine, characterized in that an airflow is passed from an outer circumference to an inner circumference of a sound absorbing body. (2) The exhaust silencing device for an internal combustion engine according to claim 1, which is a registered utility model, wherein the exhaust outlet of the porous sound absorber is provided with an expansion tube that expands in the exhaust direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18453781U JPS5887918U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18453781U JPS5887918U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5887918U JPS5887918U (en) | 1983-06-15 |
JPS6226576Y2 true JPS6226576Y2 (en) | 1987-07-08 |
Family
ID=29984779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18453781U Granted JPS5887918U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5887918U (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2545934Y2 (en) * | 1990-03-29 | 1997-08-27 | 株式会社ニッソー | Air pump silencer |
JP2008064042A (en) * | 2006-09-08 | 2008-03-21 | Kyoto Univ | Noise reducing structure and method |
-
1981
- 1981-12-09 JP JP18453781U patent/JPS5887918U/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5887918U (en) | 1983-06-15 |
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