JPS6346650Y2 - - Google Patents
Info
- Publication number
- JPS6346650Y2 JPS6346650Y2 JP18453681U JP18453681U JPS6346650Y2 JP S6346650 Y2 JPS6346650 Y2 JP S6346650Y2 JP 18453681 U JP18453681 U JP 18453681U JP 18453681 U JP18453681 U JP 18453681U JP S6346650 Y2 JPS6346650 Y2 JP S6346650Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- sound absorber
- porous sound
- outside air
- internal combustion
- 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 41
- 239000003054 catalyst Substances 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 20
- 230000030279 gene silencing Effects 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 230000003584 silencer Effects 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 15
- 230000007423 decrease Effects 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 241000234435 Lilium Species 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000001743 silencing effect 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
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N CuO Inorganic materials [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- -1 NiCr 2 O 4 Chemical class 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(II) oxide Inorganic materials [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 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
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910000108 silver(I,III) oxide Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (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に対処した内
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 silencer for an internal combustion engine that deals with 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排気ガス流路
を直線的に形成し、かつ消音効果の点からは多孔
質の吸音体を使用するのがよく、また消音効果を
長期間にわたつて維持するには上記吸音体の目詰
りを防止できる触媒を利用することが望ましい。 Here, in order to reduce pressure loss, it is better to form the exhaust gas flow path in a straight line, and to use a porous sound absorber from the point of view of silencing effect, and to maintain the silencing effect over a long period of time. Therefore, it is desirable to use a catalyst that can prevent clogging of the sound absorber.
第１図は上記要請にしたがつて提案された内燃
機関用排気消音装置の縦断側面図を示す。 FIG. 1 shows a longitudinal sectional side view of an exhaust silencing device for an internal combustion engine proposed in response to the above request.
第１図において、１は消音装置の筐体、２は筐
体１の排気上流側端部３に接続された排気入口
管、４は筐体１の排気下流側端部５に接続された
排気出口管である。６は内部を吸音用排気通路７
とした円筒形の多孔質吸音体であり、タールやカ
ーボンなどの付着を防止するための触媒、たとえ
ば低温酸化触媒などを含有する耐熱性結合剤を表
面から塗着硬化してなる。こうすると、上記触媒
粒子が吸音体６の内部に侵入して、空孔部の内表
面に付着する。上記排気入口管２と排気出口管４
との間は上記多孔質吸音体６の吸音用排気通路７
により直線的に接続されている。 In FIG. 1, 1 is the casing of the silencer, 2 is an exhaust inlet pipe connected to the exhaust upstream end 3 of the casing 1, and 4 is the exhaust gas connected to the exhaust downstream end 5 of the casing 1. This is the exit pipe. 6 is an exhaust passage for sound absorption inside 7
It is a cylindrical porous sound absorbing body made by applying and hardening a heat-resistant binder containing a catalyst such as a low-temperature oxidation catalyst from the surface to prevent the adhesion of tar and carbon. In this way, the catalyst particles enter the inside of the sound absorber 6 and adhere to the inner surface of the cavity. The above exhaust inlet pipe 2 and exhaust outlet pipe 4
A sound absorbing exhaust passage 7 of the porous sound absorbing body 6 is provided between the porous sound absorbing body 6 and
connected in a straight line.
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６の吸音用排気通路７を通り、排気出口管
４より大気中に排出される。 In the exhaust silencer configured as above, the exhaust gas discharged from the internal combustion engine is
As shown by the solid arrow, the exhaust gas passes from the exhaust inlet pipe 2 through the sound-absorbing exhaust passage 7 of the porous sound absorber 6, and is discharged into the atmosphere from the exhaust outlet pipe 4.
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
気中に放散されるが、その間に音波が多孔質吸音
体６に吸収されることにより、排気出口管４から
大気中に放散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 dissipated into the atmosphere through the same route as the exhaust gas. Exhaust noise emitted from the pipe 4 into the atmosphere is reduced.
ここで、排気ガス中にはガソリンなどの燃料の
燃焼残渣であるタールやカーボンなどが混有して
いるため、それらが多孔質吸音体６の表面に付着
し、多孔質吸音体６が目詰りを起こす。これは多
孔質吸音体６の吸音力の低下を招き、装置の消音
性能を激減させることに結びつく。 Here, since tar and carbon, which are combustion residues of fuel such as gasoline, are mixed in the exhaust gas, these adhere to the surface of the porous sound absorber 6, causing the porous sound absorber 6 to become clogged. wake up This leads to a decrease in the sound absorbing power of the porous sound absorber 6, leading to a drastic decrease in the silencing performance of the device.
これを阻止するため、たとえば低温酸化触媒を
含有する耐熱性結合剤を前記多孔質吸音体６に塗
着硬化させ、多孔質吸音体６の目詰りを防止する
構造になつている。 In order to prevent this, for example, a heat-resistant binder containing a low-temperature oxidation catalyst is applied to the porous sound absorber 6 and cured, thereby preventing clogging of the porous sound absorber 6.
しかし、通常の内燃機関の排気ガス中に含まれ
る酸素量は非常に少なく、従来の装置に利用した
触媒、たとえば低温酸化触媒などが充分な化学反
応を起こし得るほどの酸素量を含んでいない。こ
のため、触媒の能力が充分発揮されず、いつたん
触媒粒子がタールやカーボンなどで覆われると、
それらを分解または排除できなくなり、長期間に
わたつて使用すると、多孔質吸音体６の表面にタ
ールやカーボンなどが多量に付着し、消音性能が
著しく低下するという欠点があつた。 However, the amount of oxygen contained in the exhaust gas of a typical internal combustion engine is very small, and does not contain enough oxygen for the catalysts used in conventional devices, such as low-temperature oxidation catalysts, to cause a sufficient chemical reaction. For this reason, the ability of the catalyst is not fully demonstrated, and once the catalyst particles become covered with tar, carbon, etc.
It becomes impossible to decompose or eliminate them, and when used for a long period of time, a large amount of tar, carbon, etc. adhere to the surface of the porous sound absorber 6, resulting in a disadvantage that the sound deadening performance is significantly reduced.
この考案は上記欠点を除去するためになされた
もので、排気入口管からの噴流により生じる負圧
によつて外気を環状間隙に吸入させ、その外気で
タールやカーボンなどの付着防止用触媒の活性化
を促進させることにより、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性能を
発揮するほか、容易に製造できる内燃機関用排気
消音装置を提供することを目的としている。 This idea was devised to eliminate the above-mentioned drawbacks.The negative pressure generated by the jet from the exhaust inlet pipe causes outside air to be sucked into the annular gap, and the outside air activates the catalyst to prevent the adhesion of tar and carbon. The purpose of this project is to prevent clogging of the porous sound absorber and provide stable sound-dampening performance over a long period of time, as well as to provide an exhaust muffling device for internal combustion engines that is easy to manufacture. .
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ａ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概略断面図である。この図に
おいて、１は筐体、２は筐体１の排気上流側端部
３に接続されて排気ガスが導入される排気入口
管、４は筐体１の排気下流側端部５に接続された
排気出口管である。６は先に述べたような触媒を
利用した円筒形の多孔質吸音体で、内部には上記
排気入口管２の下流側に接続される吸音用排気通
路７が形成され、この吸音用排気通路７は、排気
入口管２の外径より大径となつている。上記多孔
質吸音体６は、第２図ｂで示すように、多数の空
孔部２０とその空孔部２０を形成する骨格２１と
からなる。各空孔部２０は、多孔質吸音体６の内
周面６ａおよび外周面６ｂにおいてそれぞれ開口
している。多孔質吸音体６の内周面６ａには、一
点鎖線で示すように、触媒２２を含有した結合剤
２５が塗着硬化され、この触媒２２は、上記内周
面６ａに塗着された際に、上記各空孔部２０に侵
入して、各空孔部２０の内表面２０ａに付着して
いる。 FIG. 2a is a schematic cross-sectional view of an exhaust silencing device for an internal combustion engine according to an embodiment of this invention. In this figure, 1 is a housing, 2 is an exhaust inlet pipe connected to the exhaust upstream end 3 of the housing 1 to introduce exhaust gas, and 4 is connected to the exhaust downstream end 5 of the housing 1. This is the exhaust outlet pipe. Reference numeral 6 denotes a cylindrical porous sound absorber using a catalyst as described above, and a sound absorbing exhaust passage 7 connected to the downstream side of the exhaust inlet pipe 2 is formed inside the body. 7 has a larger diameter than the outer diameter of the exhaust inlet pipe 2. The porous sound absorber 6 is composed of a large number of pores 20 and a skeleton 21 forming the pores 20, as shown in FIG. 2b. Each of the pores 20 is open at the inner circumferential surface 6a and the outer circumferential surface 6b of the porous sound absorber 6, respectively. A binder 25 containing a catalyst 22 is applied and hardened to the inner circumferential surface 6a of the porous sound absorber 6, as shown by the dashed line. Then, it invades each of the holes 20 and adheres to the inner surface 20a of each hole 20.
上記多孔質吸音体６は、第２図ａの筐体１内に
収納され、吸音用排気通路７により排気入口管２
と排気出口管４との間を直線的に接続している
が、多孔質吸音体６の排気入口部８は排気入口管
２の先端噴射部９に対し、この先端噴射部９との
間に環状間隙１０を保つて同心的に配置されてい
る。この環状間隙１０は、上記排気入口管２から
の噴流により生じる負圧によつて外気を吸入させ
るものである。すなわち、上記多孔質吸音体６の
排気入口部８、排気入口管２の先端噴射部９、両
者８，９間の環状間隙１０によりエジエクタ１１
が構成されている。また上記筐体１の排気上流側
端部３は二重壁構造で、その間は外気導入通路１
２に形成され、かつこの外部導入通路１２の一端
は上記排気上流側端部３の前方に開口した外気流
入口１３に、他端は上記エジエクタ１１の流出口
としての環状間隙１０にそれぞれ接続されてい
る。なお、排気出口管４の内径は吸着用排気通路
７の直径とほぼ同径である。 The porous sound absorber 6 is housed in the casing 1 shown in FIG.
and the exhaust outlet pipe 4 are connected linearly, but the exhaust inlet part 8 of the porous sound absorber 6 is connected to the tip injection part 9 of the exhaust inlet pipe 2. They are arranged concentrically with an annular gap 10 maintained between them. This annular gap 10 allows outside air to be sucked in by the negative pressure generated by the jet flow from the exhaust inlet pipe 2. That is, the exhaust inlet part 8 of the porous sound absorber 6, the tip injection part 9 of the exhaust inlet pipe 2, and the annular gap 10 between them 8 and 9 form the ejector 11.
is configured. Furthermore, the exhaust upstream end 3 of the casing 1 has a double wall structure, with an outside air introduction passage 1 between the two walls.
2, one end of this external introduction passage 12 is connected to an outside air inlet 13 opened in front of the exhaust upstream end 3, and the other end is connected to an annular gap 10 serving as an outlet of the ejector 11. ing. The inner diameter of the exhaust outlet pipe 4 is approximately the same as the diameter of the adsorption exhaust passage 7.
上記のように構成された排気用消音装置におい
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
６の吸音用排気通路７を通り、排気出口管４より
大気中に排出され、また、排気音は多孔質吸音体
６に吸収される。このとき、エジエクタ１１にお
いて、排気ガスの排気入口管２から吸音用排気通
路７への噴流により生じる負圧によつて、外気流
入口１３から外気導入通路１２に、さらにこの外
気導入通路１２から環状間隙１０を通して吸音用
排気通路７内に外気（点線矢印）が吸入される。
この外気によつて、第２図ｂの多孔質吸音体６の
空孔部２０に付着した触媒２２に十分な酸素量が
供給される。これにより、触媒２２の活性化が促
進されるため、排気ガス中に含まれるタール、カ
ーボンなどの分解または除去が円滑に行なわれ
る。したがつて、多孔質吸音体６の空孔部２０に
タールなどが付着しないので、目詰りが阻止さ
れ、長期間にわたつて安定した消音性能が得られ
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 7 of the porous sound-absorbing body 6; The exhaust gas is discharged into the atmosphere from the exhaust outlet pipe 4, and the exhaust sound is absorbed by the porous sound absorber 6. At this time, in the ejector 11, the negative pressure generated by the jet of exhaust gas from the exhaust inlet pipe 2 to the sound-absorbing exhaust passage 7 causes the outside air inlet 13 to flow into the outside air introduction passage 12, and from this outside air introduction passage 12 into the annular shape. Outside air (dotted line arrow) is drawn into the sound absorbing exhaust passage 7 through the gap 10.
This outside air supplies a sufficient amount of oxygen to the catalyst 22 attached to the pores 20 of the porous sound absorber 6 shown in FIG. 2b. This promotes activation of the catalyst 22, so that tar, carbon, and the like contained in the exhaust gas are smoothly decomposed or removed. Therefore, since tar and the like do not adhere to the pores 20 of the porous sound absorber 6, clogging is prevented and stable sound damping performance can be obtained over a long period of time.
ところで、上記触媒２２を含有した結合剤２５
を第２図ａの多孔質吸音体６の内周面６ａだけで
なく、外周面６ｂにも塗着するようにしてもよ
い。 By the way, the binder 25 containing the catalyst 22
may be applied not only to the inner circumferential surface 6a of the porous sound absorber 6 shown in FIG. 2a but also to the outer circumferential surface 6b.
なお、第２図ａのように、外気流入口１３を筐
体１の排気上流側端部３に設けた場合には、この
考案にかかる排気消音装置が車両に設けられ、矢
印Ａ方向に外気を切る場合、エジエクタ１１の作
用を助長して、多孔質吸音体６内への風量供給量
を増大させることができる。 Note that when the outside air inlet 13 is provided at the exhaust upstream end 3 of the housing 1 as shown in FIG. When the sound absorber 6 is turned off, the action of the ejector 11 is promoted and the amount of air supplied into the porous sound absorber 6 can be increased.
第３図はこの考案にかかる排気消音装置を排気
量1400c.c.のガソリンエンジン乗用車の排気消音装
置として応用し、実走行でその消音性能を調査し
た結果を示す。なお、ここでいう消音性能とは消
音装置のあり、なし時の排気音オーバーオール値
の差であり、その測定はJISD−1616に基づくも
のである。 Fig. 3 shows the results of an investigation into the silencing performance of the exhaust silencing device according to this invention in actual driving, when the exhaust silencing device was applied to a gasoline engine passenger car with a displacement of 1400 c.c. Note that the silencing performance here refers to the difference in the overall value of exhaust sound with and without a silencing device, and its measurement is based on JISD-1616.
図中、横軸は実走行距離を、縦軸は走行距離が
零の時の装置の消音量を基準（零デシベル）とし
たときの各走行距離毎の消音性能の低下量を示し
ており、また実線は従来の消音装置を、点線はこ
の考案における消音装置のそれを示している。 In the figure, the horizontal axis represents the actual distance traveled, and the vertical axis represents the amount of reduction in noise reduction performance for each distance traveled, with the silencing volume of the device when the distance traveled is zero as the reference (zero decibels). Moreover, the solid line shows the conventional muffler, and the dotted line shows the muffler according to this invention.
図の結果から明らかなように、従来の消音装置
における消音性能は約15000Km以上の走行距離に
なると極端に低下しはじめ、30000Km程度で15dB
もの低下がみられた。 As is clear from the results shown in the figure, the noise reduction performance of conventional noise reduction devices begins to deteriorate significantly when the distance traveled is approximately 15,000km or more, and at approximately 30,000km, the noise reduction performance begins to deteriorate by 15dB at approximately 30,000km.
A decline was seen.
しかし、この考案による消音装置の性能は
30000Km走行後においても3dB程度の低下がみら
れるだけであつた。 However, the performance of the silencer based on this invention is
Even after driving for 30,000 km, a decrease of only about 3 dB was observed.
30000Km走行後の消音装置をそれぞれ分解し、
多孔質吸音体６の表面および内面を目視観察した
結果、従来の装置については、タールやカーボン
の付着が激しく、著しい吸音材の目詰りがみられ
たが、この考案の装置においてはタールやカーボ
ンがあまり付着しておらず、目詰りも比較的少な
かつた。 Disassemble each silencer after driving 30,000km,
As a result of visual observation of the surface and inner surface of the porous sound absorber 6, it was found that in the conventional device, there was heavy adhesion of tar and carbon, resulting in significant clogging of the sound absorbing material, but in the device of this invention, tar and carbon There was not much adhesion, and there was relatively little clogging.
これにより、この考案による消音装置は内燃機
関用排気消音装置として実用に充分貢献し得るも
のであることが確認された。 As a result, it was confirmed that the muffler according to this invention can fully contribute to practical use as an exhaust muffler for internal combustion engines.
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、外気流入口１３は筐体１の排気下
流側端部５に設けることができる。このような構
成では、この排気消音装置が既に述べたように矢
印Ａ方向に外気を切る場合、外気導入通路１２に
雨水や塵埃が入りにくくなり、かつ外気流入口１
３からエジエクタ１１までの外気導入通路１２の
長さを長くとることができ、外気導入通路１２を
通しての排気音の漏洩が低減されるとともに、エ
ジエクタ１１に引き込まれる空気が多孔質吸音体
６を通る排気ガスにより充分予熱され、多孔質吸
音体６へのタールやカーボンなどの付着防止効果
が増大する。さらに、外気導入通路１２により筐
体１の外周部１４を排気上流側端部３と同様の２
重壁構造とすることができ、したがつて筐体１か
らの透過音も低減される。 FIG. 4 shows another embodiment of this invention. As shown in this figure, the outside air inlet 13 can be provided at the exhaust downstream end 5 of the housing 1 . With such a configuration, when this exhaust silencer cuts the outside air in the direction of the arrow A as described above, it becomes difficult for rainwater and dust to enter the outside air introduction passage 12, and the outside air inlet 1
3 to the ejector 11 can be made longer, leakage of exhaust sound through the outside air introduction passage 12 is reduced, and the air drawn into the ejector 11 passes through the porous sound absorber 6. It is sufficiently preheated by the exhaust gas, and the effect of preventing tar, carbon, etc. from adhering to the porous sound absorber 6 is increased. Furthermore, the outside air introduction passage 12 connects the outer peripheral part 14 of the casing 1 to the same position as the exhaust upstream end 3.
It can have a heavy-walled structure, and therefore the transmitted sound from the housing 1 is also reduced.
第５図もこの考案の他の実施例を示す。この図
に示すように、排気出口管として排気方向に拡が
る拡大管１５を設けることができる。この構成で
は、拡大管１５の入口部の排気速度が出口部での
それより大きくなり、多孔質吸音体６内の圧力が
低下することにより、外気流入口１３からの外気
の導入作用が助長され、上記触媒の活性化がさら
に促進される。 FIG. 5 also shows another embodiment of this invention. As shown in this figure, an enlarged pipe 15 expanding in the exhaust direction can be provided as an exhaust outlet pipe. In this configuration, the exhaust speed at the inlet of the expansion tube 15 becomes higher than that at the outlet, and the pressure inside the porous sound absorber 6 decreases, thereby promoting the introduction of outside air from the outside air inlet 13. , the activation of the catalyst is further promoted.
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.
また、低温酸化触媒としては、MnO2，CuO，
NiO，CoO，Co3O4，Cr2O3，Fe2O3，Ag2O，
ZnO，PbOなどの金属酸化物や、MnFe2O4，
NiCr2O4，MnCr2O4，CuCr2O4などの複合金属酸
化物や、Pt，Pd，Rh，Ru，Agなどの貴金属単
体を使用することができる。 In addition, as low-temperature oxidation catalysts, MnO 2 , CuO,
NiO, CoO, Co3O4 , Cr2O3 , Fe2O3 , Ag2O ,
Metal oxides such as ZnO, PbO, MnFe 2 O 4 ,
Composite metal oxides such as NiCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 or noble metals such as Pt, Pd, Rh, Ru, Ag can be used.
ところで、上記エジエクタ１１の代りに、排気
入口管２の先端噴射部９にベンチユリを形成する
ことによつても上記と同様の効果が得られるが、
このベンチユリの場合には、形状的に製作が困難
であるとともに、ベンチユリ部の長さが長く、そ
のベンチユリ部によつて多孔質吸音体６の排気入
口部８の内面が閉ざされるため、多孔質吸音体６
の吸音効果が低下する。この点、この考案では、
排気入口管２と多孔質吸音体６とを互いに径違い
に形成してなるエジエクタ１１を採用しているの
で、製造が容易であるとともに、多孔質吸音体６
の全長を無駄なく使用することができ、消音効果
を損うことがない。 By the way, the same effect as above can be obtained by forming a bench lily at the tip injection part 9 of the exhaust inlet pipe 2 instead of the ejector 11.
In the case of this bench lily, it is difficult to manufacture due to its shape, the length of the bench lily is long, and the inner surface of the exhaust inlet part 8 of the porous sound absorber 6 is closed by the bench lily, so the porous Sound absorber 6
The sound absorption effect of In this regard, in this idea,
Since the ejector 11 in which the exhaust inlet pipe 2 and the porous sound absorber 6 are formed with different diameters from each other is adopted, manufacturing is easy and the porous sound absorber 6
The entire length can be used without waste, and the silencing effect will not be impaired.
以上説明したように、この考案によれば、排気
入口管からの噴流により生じる負圧によつて環状
間隙に外気を吸入させ、その外気でタールやカー
ボンなどの付着防止用触媒の活性化を促進させる
ことにより、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性能を発揮するほ
か、容易に製造でき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, the negative pressure generated by the jet from the exhaust inlet pipe causes outside air to be sucked into the annular gap, and the outside air promotes the activation of the catalyst for preventing the adhesion of tar and carbon. By doing so, it is possible to prevent clogging of the porous sound absorber, to exhibit stable sound damping performance over a long period of time, and to provide an exhaust muffler for an internal combustion engine that can be easily manufactured.
第１図は従来提案されている内燃機関用排気消
音装置の断面図、第２図ａ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断面図、第２
図ｂは多孔質吸音体における触媒の付着状態を説
明する拡大断面図、第３図は消音性能図、第４図
および第５図はこの考案の他の実施例にかかる内
燃機関用排気消音装置の断面図である。
１……筐体、２……排気入口管、５……排気下
流側端部、６……多孔質吸音体、７……吸音用排
気通路、１０……環状間隙、１２……外気導入通
路、１３……外気流入口、１５……拡大管、２０
……空孔部、２０ａ……内表面、２２……触媒。
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 sectional view of a conventionally proposed exhaust silencing device for internal combustion engines, FIG. 2a is a sectional view of an exhaust silencing device for internal combustion engines according to an embodiment of this invention,
Fig. b is an enlarged cross-sectional view illustrating the state of adhesion of the catalyst on the porous sound absorber, Fig. 3 is a silencing performance diagram, and Figs. 4 and 5 are exhaust silencing devices for internal combustion engines according to other embodiments of this invention. FIG. DESCRIPTION OF SYMBOLS 1... Housing, 2... Exhaust inlet pipe, 5... Exhaust downstream end, 6... Porous sound absorber, 7... Sound absorbing exhaust passage, 10... Annular gap, 12... Outside air introduction passage , 13... Outside air inlet, 15... Expansion tube, 20
...Void portion, 20a...Inner surface, 22...Catalyst.
In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
接続された吸音用排気通路を円筒形の多孔質吸
音体で形成し、この多孔質吸音体の空孔部の内
表面にタール、カーボンなどの付着防止用触媒
を付着させた内燃機関用排気消音装置におい
て、上記吸音用排気通路を上記排気入口管の外
径よりも大径にして、上記排気入口管と多孔質
吸音体との間に、上記排気入口管からの噴流に
より生じる負圧によつて外気を吸入させる環状
間隙を形成し、かつ上記多孔質吸音体を収容し
た筐体に上記環状間隙への外気導入通路を形成
したことを特徴とする内燃機関用排気消音装
置。 (2) 外気流入口を筐体の排気下流側端部に設けた
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。 (3) 筐体の排気出口部に排気方向に拡がる拡大管
を設けた実用新案登録請求の範囲第１項または
第２項記載の内燃機関用排気消音装置。[Scope of Claim for Utility Model Registration] (1) A sound-absorbing exhaust passage connected to the downstream side of the exhaust inlet pipe into which exhaust gas is introduced is formed of a cylindrical porous sound absorber, and the air in the porous sound absorber is In an exhaust silencer for an internal combustion engine in which a catalyst for preventing adhesion of tar, carbon, etc. is attached to the inner surface of the hole, the sound-absorbing exhaust passage is made to have a larger diameter than the outer diameter of the exhaust inlet pipe, and the exhaust inlet An annular gap is formed between the pipe and the porous sound absorber, through which outside air is sucked in by negative pressure generated by the jet flow from the exhaust inlet pipe, and the annular gap is formed in the casing housing the porous sound absorber. An exhaust silencer for an internal combustion engine, characterized in that an outside air introduction passage is formed. (2) The exhaust silencing device for an internal combustion engine according to claim 1, wherein the outside air inlet is provided at the exhaust downstream end of the casing. (3) The exhaust silencing device for an internal combustion engine according to claim 1 or 2, wherein an expansion pipe expanding in the exhaust direction is provided at the exhaust outlet of the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18453681U JPS5887917U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18453681U JPS5887917U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5887917U JPS5887917U (en) | 1983-06-15 |
| JPS6346650Y2 true JPS6346650Y2 (en) | 1988-12-02 |
Family
ID=29984777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18453681U Granted JPS5887917U (en) | 1981-12-09 | 1981-12-09 | Exhaust silencer for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5887917U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07657Y2 (en) * | 1986-03-06 | 1995-01-11 | エヌデ−シ−株式会社 | Silencer for air blower |
-
1981
- 1981-12-09 JP JP18453681U patent/JPS5887917U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5887917U (en) | 1983-06-15 |
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