EP0380394A1 - Exhaust gas silencer and exhaust section including such a silencer - Google Patents

Exhaust gas silencer and exhaust section including such a silencer Download PDF

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Publication number
EP0380394A1
EP0380394A1 EP90400167A EP90400167A EP0380394A1 EP 0380394 A1 EP0380394 A1 EP 0380394A1 EP 90400167 A EP90400167 A EP 90400167A EP 90400167 A EP90400167 A EP 90400167A EP 0380394 A1 EP0380394 A1 EP 0380394A1
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EP
European Patent Office
Prior art keywords
silencer
exhaust
tube
gases
inner tube
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.)
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Application number
EP90400167A
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German (de)
French (fr)
Inventor
Henri Lescher
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Glaenzer Spicer SA
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Glaenzer Spicer SA
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Publication date
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Publication of EP0380394A1 publication Critical patent/EP0380394A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/12—Tubes being corrugated

Definitions

  • the present invention relates to a silencer for exhaust gases of an internal combustion engine of the type comprising an outer cylindrical casing and an inner coaxial cylindrical tube which delimit between them an annular cylindrical chamber in which are admitted the exhaust gases which penetrate in the silent.
  • the invention also relates to an exhaust line part incorporating such a silencer.
  • the high temperature of the exhaust gases generally has the drawback of making the materials, and in particular the metals, that make up the silencers work, often beyond the permissible conditions that are bearable in the long term.
  • vibrations at low frequencies created by the succession of explosions at certain speeds and by the mechanical excitation of certain organs such as the engine-muffler connection tubes as well as the transverse partitions of the muffler that are struck by the exhaust gases. , cause significant discomfort and cause a thud in the passenger compartment of the vehicle.
  • the aim of the present invention is to propose a silencer which makes it possible to reduce and distribute the temperature spikes to which the materials constituting the silencer are subjected and to simultaneously transform most of the low frequencies into medium and high frequencies which are more easy to cushion and absorb.
  • the invention must also make it possible to suppress the impact of the gas shock wave against walls or bottoms perpendicular to the direction of propagation of the gases and to distribute the gas jet over a larger surface.
  • the invention provides a silencer characterized in that the inner tube is a perforated tube, a first open end of which constitutes the single inlet for the gases into the silencer and the opposite opposite end of which is closed, and that the inner wall of the outer envelope is coated with a layer of absorbent material which extends axially substantially over the entire length of the inner tube.
  • the other closed end of the inner tube is shaped to cause the reflection of the gases.
  • the invention also provides an exhaust line part for the flow of exhaust gases from an internal combustion engine, of the type comprising a continuous external envelope of substantially constant cross section enclosing at least one acoustic attenuation block positioned longitudinally in the envelope so as to delimit at least one transfer section of the fluid of determined length so that the latter participates in the acoustic attenuation function of the part of exhaust line, characterized in that at least one section of the exhaust line portion is produced so as to constitute a silencer according to the invention, said continuous outer casing of substantially constant section forming the outer cylindrical casing of the silencer .
  • the section forming a silencer may for example be the inlet section of the exhaust line, and the exhaust line comprises a connection portion which connects the internal wall of the external envelope to the open end of the inner tube.
  • the partial section view of the figure represents a silencer 10, the cylindrical outer casing 12 of which is connected to a cylindrical inner tube 14 for admitting the gases by a conical connection portion 16.
  • the inner cylindrical tube 14 has a first open end 17 through which all of the exhaust gases circulating in a part of the exhaust line (not shown) are admitted thanks to the connection portion 16 which guides all of the gases to this open end.
  • the second end 18 of the inner tube 14 is one end closed by a flattened solid portion, that is to say non-perforated, against which come to reflect at least a part B of the gases A which penetrate into the inner tube 14. Any form from the end 18, for example of revolution, having no wall perpendicular to the flow and causing the reflection of the gases may be suitable for closing the tube.
  • the wall of the inner tube is perforated so as to allow the admission of the gases C into the annular cylindrical internal chamber 22 delimited radially by the outer wall of the tube interior 14 and through the internal wall of the exterior envelope 12.
  • the inner wall of the outer casing 12 is lined by an annular sleeve made of absorbent material 24.
  • the absorbent material may for example be a layer of steel wool maintained pressed radially outwards by a helical spring 26.
  • the coefficient of heat transferability of the material, for example aluminum, constituting the outer envelope 12 is chosen to be significantly greater than the coefficient of the absorbent material 24 so as to create a large temperature gradient, the thermal shock being absorbed by the absorbent material 24.
  • the length of the perforated inner tube 14 is large enough to allow a distribution of the heat flux to be absorbed over a large cylindrical surface and not punctual.
  • the inner tube 14 is also long enough not to create a back pressure which is harmful to the general flow of gases in the exhaust line.
  • shock wave does not at any time meet a wall perpendicular to the general direction of its propagation.
  • the low frequencies are transformed into medium and high frequencies by a phenomenon called "whistle".
  • the absorbent material 24 also participates in the acoustic attenuation function by absorbing a large part of these medium and high frequencies.
  • the reflected gases which emerge from the absorbent material have given up part of their calories, the latter gradually evacuating towards the outside to reach the envelope 12 which constitutes the medium for exchange with the outside air.
  • the final exchange surface can be increased by providing a corrugated zone 30 which projects radially outwards.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to an exhaust-gas silencer (10) of an internal-combustion engine, of the type comprising an outer cylindrical casing (12) and a coaxial inner cylindrical tube (14) which between them delimit an annular cylindrical chamber (22), into which are admitted the exhaust gases entering the silencer. …<??>According to the invention, the inner tube (14) is a perforated tube (28), of which a first open end (17) forms the single orifice for the admission of the gases into the silencer and of which the other opposite end (18) is closed, and the inner wall of the outer casing is lined with a layer (24) of absorbent material which extends axially substantially over the entire perforated length (28) of the inner tube. …<IMAGE>…

Description

La présente invention concerne un silencieux pour gaz d'échappement d'un moteur à combustion interne du type comportant une enveloppe cylindrique extérieure et un tube cylindrique intérieur coaxial qui délimitent entre eux une chambre cylindrique annulaire dans laquelle sont admis les gaz d'échappe­ment qui pénètrent dans le silencieux.The present invention relates to a silencer for exhaust gases of an internal combustion engine of the type comprising an outer cylindrical casing and an inner coaxial cylindrical tube which delimit between them an annular cylindrical chamber in which are admitted the exhaust gases which penetrate in the silent.

L'invention concerne également une partie de ligne d'échappement intégrant un tel silencieux.The invention also relates to an exhaust line part incorporating such a silencer.

La haute température des gaz d'échappement a généralement pour inconvénient de faire travailler les matériaux, et notamment les métaux, constitutifs des silencieux souvent au-delà des conditions admissibles et supportables à long terme.The high temperature of the exhaust gases generally has the drawback of making the materials, and in particular the metals, that make up the silencers work, often beyond the permissible conditions that are bearable in the long term.

Ces températures élevées créent des déforma­tions et/ou des destructions totales ou partielles dans les lignes d'échappement, surtout dans la zone d'entrée des silencieux, notamment du fait d'un phénomène de fatigue thermique. Ce phénomène prend de plus en plus d'importance avec la généralisation des lignes d'échappement comportant des unités de dépollution par traitement catalytique à la sortie desquelles les gaz atteignent communément des tempéra­tures supérieures à 900°C. De plus de très hautes températures ne facilitent pas l'utilisation des alliages légers dont la faible densité permet par ailleurs de très importantes réductions de poids.These high temperatures create deformations and / or total or partial destruction in the exhaust lines, especially in the zone of entry of the silencers, in particular due to a phenomenon of thermal fatigue. This phenomenon is becoming more and more important with the generalization of exhaust lines comprising depollution units by catalytic treatment at the outlet of which the gases commonly reach temperatures above 900 ° C. In addition, very high temperatures do not facilitate the use of light alloys, the low density of which also allows very significant weight reductions.

De plus des vibrations à basses fréquences, créées par la succession des explosions à certains régimes et par l'excitation mécanique de certains organes tels que les tubes de liaison moteur-silen­cieux ainsi que les cloisons transversales du silencieux que viennent percuter les gaz d'échappe­ment, apportent une gêne importante et provoquent un bruit sourd dans l'habitacle du véhicule.In addition, vibrations at low frequencies, created by the succession of explosions at certain speeds and by the mechanical excitation of certain organs such as the engine-muffler connection tubes as well as the transverse partitions of the muffler that are struck by the exhaust gases. , cause significant discomfort and cause a thud in the passenger compartment of the vehicle.

Le but de la présente invention est de proposer un silencieux qui permette de réduire et de répartir les pointes de températures auxquelles sont soumis les matériaux constitutifs du silencieux et de transformer simultanément la plus grande partie des basses fréquences en des fréquences moyennes et hautes qui sont plus aisées à amortir et à absorber. L'invention doit également permettre de supprimer l'impact de l'onde de choc des gaz contre des parois ou fonds perpendiculaires à la direction de propaga­tion des gaz et de répartir le jet de gaz sur une surface plus importante.The aim of the present invention is to propose a silencer which makes it possible to reduce and distribute the temperature spikes to which the materials constituting the silencer are subjected and to simultaneously transform most of the low frequencies into medium and high frequencies which are more easy to cushion and absorb. The invention must also make it possible to suppress the impact of the gas shock wave against walls or bottoms perpendicular to the direction of propagation of the gases and to distribute the gas jet over a larger surface.

Dans ce but l'invention propose un silen­cieux caractérisé en ce que le tube intérieur est un tube perforé dont une première extrémité ouverte constitue l'orifice d'admission unique des gaz dans le silencieux et dont l'autre extrémité opposée est fermée, et en ce que la paroi interne de l'enveloppe extérieure est revêtue d'une couche de matériau absorbant qui s'étend axialement sensiblement sur toute la longueur du tube intérieur.For this purpose, the invention provides a silencer characterized in that the inner tube is a perforated tube, a first open end of which constitutes the single inlet for the gases into the silencer and the opposite opposite end of which is closed, and that the inner wall of the outer envelope is coated with a layer of absorbent material which extends axially substantially over the entire length of the inner tube.

Selon une autre caractéristique, l'autre extrémité fermée du tube intérieur est conformée pour provoquer la réflexion des gaz.According to another characteristic, the other closed end of the inner tube is shaped to cause the reflection of the gases.

L'invention propose également une partie de ligne d'échappement pour l'écoulement des gaz d'échappement d'un moteur à combustion interne, du type comportant une enveloppe externe continue de section sensiblement constante renfermant au moins un bloc d'atténuation acoustique positionné longitudina­lement dans l'enveloppe de façon à délimiter au moins un tronçon de transfert du fluide de longueur déter­minée de manière que ce dernier participe à la fonction d'atténuation acoustique de la partie de ligne d'échappement, caractérisée en ce que au moins un tronçon de la partie de ligne d'échappement est réalisé de façon à constituer un silencieux selon l'invention, ladite enveloppe externe continue de section sensiblement constante formant l'enveloppe cylindrique extérieure du silencieux.The invention also provides an exhaust line part for the flow of exhaust gases from an internal combustion engine, of the type comprising a continuous external envelope of substantially constant cross section enclosing at least one acoustic attenuation block positioned longitudinally in the envelope so as to delimit at least one transfer section of the fluid of determined length so that the latter participates in the acoustic attenuation function of the part of exhaust line, characterized in that at least one section of the exhaust line portion is produced so as to constitute a silencer according to the invention, said continuous outer casing of substantially constant section forming the outer cylindrical casing of the silencer .

Le tronçon formant silencieux peut par exemple être le tronçon d'entrée de la ligne d'échappement, et la ligne d'échappement comporte une portion de raccordement qui relie la paroi interne de l'enveloppe externe à l'extrémité ouverte du tube intérieur.The section forming a silencer may for example be the inlet section of the exhaust line, and the exhaust line comprises a connection portion which connects the internal wall of the external envelope to the open end of the inner tube.

D'autres caractéristiques de l'invention apparaîtront à la lecture de la description qui va suivre pour la compréhension de laquelle on se reportera au dessin annexé dans lequel la figure unique représente un silencieux réalisé conformément aux enseignements de l'invention.Other characteristics of the invention will appear on reading the description which follows for the understanding of which reference will be made to the appended drawing in which the single figure represents a silencer produced in accordance with the teachings of the invention.

La vue en coupe partielle de la figure représente un silencieux 10 dont l'enveloppe extérieure cylindrique 12 est reliée à un tube intérieur cylindrique 14 d'admission des gaz par une portion conique de raccordement 16.The partial section view of the figure represents a silencer 10, the cylindrical outer casing 12 of which is connected to a cylindrical inner tube 14 for admitting the gases by a conical connection portion 16.

Le tube cylindrique intérieur 14 comporte une première extrémité ouverte 17 par laquelle est admis la totalité des gaz d'échappement circulant dans une partie de la ligne d'échappement (non représentée) grâce à la portion de raccordement 16 qui guide la totalité des gaz vers cette extrémité ouverte.The inner cylindrical tube 14 has a first open end 17 through which all of the exhaust gases circulating in a part of the exhaust line (not shown) are admitted thanks to the connection portion 16 which guides all of the gases to this open end.

La seconde extrémité 18 du tube intérieur 14 est une extrémité fermée par une portion aplatie pleine, c'est-à-dire non perforée, contre laquelle viennent se réfléchir au moins une partie B des gaz A qui pénètrent dans le tube intérieur 14. Toute forme de l'extrémité 18, par exemple de révolution, ne comportant pas de paroi perpendiculaire à l'écoulement et provoquant la réflexion des gaz peut convenir pour la fermeture du tube.The second end 18 of the inner tube 14 is one end closed by a flattened solid portion, that is to say non-perforated, against which come to reflect at least a part B of the gases A which penetrate into the inner tube 14. Any form from the end 18, for example of revolution, having no wall perpendicular to the flow and causing the reflection of the gases may be suitable for closing the tube.

Sur toute sa longueur située en regard de la paroi de l'enveloppe cylindrique extérieure 12, la paroi du tube intérieur est perforée de manière à permettre l'admission des gaz C dans la chambre interne cylindrique annulaire 22 délimitée radialement par la paroi externe du tube intérieur 14 et par la paroi interne de l'enveloppe extérieure 12.Over its entire length located opposite the wall of the outer cylindrical casing 12, the wall of the inner tube is perforated so as to allow the admission of the gases C into the annular cylindrical internal chamber 22 delimited radially by the outer wall of the tube interior 14 and through the internal wall of the exterior envelope 12.

Sur toute sa longueur en vis-à-vis du tube intérieur 14, la paroi interne de l'enveloppe exté­rieure 12 est doublée par un manchon annulaire en matériau absorbant 24. Le matériau absorbant peut par exemple être une couche de laine d'acier maintenue plaquée radialement vers l'extérieur par un ressort en hélice 26.Over its entire length opposite the inner tube 14, the inner wall of the outer casing 12 is lined by an annular sleeve made of absorbent material 24. The absorbent material may for example be a layer of steel wool maintained pressed radially outwards by a helical spring 26.

Les gaz C qui sortent du tube intérieur 14 par les perforations 28 pénètrent et éventuellement traversent le matériau absorbant 24 pour se réfléchir D contre la paroi interne de l'enveloppe extérieure 12.The gases C which exit from the internal tube 14 through the perforations 28 penetrate and possibly pass through the absorbent material 24 to reflect D against the internal wall of the external envelope 12.

Le coefficient de transmissibilité des calories du matériau, par exemple de l'aluminium, constitutif de l'enveloppe extérieure 12 est choisi pour être nettement supérieur au coefficient du matériau absorbant 24 de façon à créer un gradient de température important, le choc thermique étant encaissé par le matériau absorbant 24.The coefficient of heat transferability of the material, for example aluminum, constituting the outer envelope 12 is chosen to be significantly greater than the coefficient of the absorbent material 24 so as to create a large temperature gradient, the thermal shock being absorbed by the absorbent material 24.

De plus la longueur du tube intérieur 14 perforé est suffisamment grande pour permettre une répartition du flux thermique à absorber sur une surface cylindrique importante et non ponctuelle.In addition, the length of the perforated inner tube 14 is large enough to allow a distribution of the heat flux to be absorbed over a large cylindrical surface and not punctual.

Le tube intérieur 14 est également suffisam­ment long pour ne pas créer de contrepression nuisible à l'écoulement général des gaz dans la ligne d'échap­pement.The inner tube 14 is also long enough not to create a back pressure which is harmful to the general flow of gases in the exhaust line.

On constate que l'onde de choc ne rencontre à aucun moment de paroi parpendiculaire à la direction générale de sa propagation.It can be seen that the shock wave does not at any time meet a wall perpendicular to the general direction of its propagation.

Lors de leur passage à travers les trous 28 du tube perforé 14, les basses fréquences se transfor­ment en moyennes et hautes fréquences par un phénomène dit de "sifflet".During their passage through the holes 28 of the perforated tube 14, the low frequencies are transformed into medium and high frequencies by a phenomenon called "whistle".

Le matériau absorbant 24 participe également à la fonction d'atténuation acoustique en absorbant une grande partie de ces moyennes et hautes fréquen­ces.The absorbent material 24 also participates in the acoustic attenuation function by absorbing a large part of these medium and high frequencies.

Du fait de l'accroissement important de section entre le tube intérieur 14 et l'enveloppe extérieure 12 dans leurs zones qui délimitent en commun la chambre annulaire 22, par exemple dans un rapport compris entre 2 et 5, il se produit un ralentissement de la vitesse de propagation des gaz d'échappement ce qui permet une réduction du bruit régénéré.Due to the significant increase in section between the inner tube 14 and the outer casing 12 in their zones which jointly define the annular chamber 22, for example in a ratio of between 2 and 5, there is a slowing down of the speed of propagation of the exhaust gases which allows a reduction of the regenerated noise.

Les gaz réfléchis qui ressortent du matériau absorbant ont abandonné une partie de leurs calories, ces dernières s'évacuant progressivement vers l'exté­rieur pour atteindre l'enveloppe 12 qui constitue le médium d'échange avec l'air extérieur. La surface d'échange final peut être augmentée en prévoyant une zone annelée 30 qui fait saillie radialement vers l'extérieur.The reflected gases which emerge from the absorbent material have given up part of their calories, the latter gradually evacuating towards the outside to reach the envelope 12 which constitutes the medium for exchange with the outside air. The final exchange surface can be increased by providing a corrugated zone 30 which projects radially outwards.

Le passage des gaz, dans les trous 28 permet enfin de réaliser une homogénéisation des gaz et une meilleure combustion des imbrûlés.The passage of gases in the holes 28 finally makes it possible to achieve homogenization of the gases and better combustion of unburnt products.

Claims (7)

1. Silencieux (10) pour gaz d'échappement d'un moteur à combustion interne du type comportant une enveloppe cylindrique extérieure (12) et un tube cylindrique intérieur (14) coaxial qui délimitent entre eux une chambre cylindrique annulaire (22) dans laquelle sont admis les gaz d'échappement qui pénètrent dans le silencieux, le tube intérieur (14) étant un tube perforé (28) dont une première extrémité ouverte (17) constitue l'orifice d'admission unique des gaz dans le silencieux et dont l'autre extrémité opposée (18) est fermée, la paroi interne de l'enveloppe extérieure étant revêtue d'une couche (24) de matériau absorbant qui s'étend axialement sensiblement sur toute la longueur perforée (28) du tube intérieur, caractérisé en ce que ladite autre extrémité fermée du tube intérieur est conformée (20) pour provoquer la réflexion d'au moins une partie des gaz qui pénètrent dans le tube intérieur.1. Muffler (10) for exhaust gas from an internal combustion engine of the type comprising an outer cylindrical casing (12) and an inner cylindrical tube (14) coaxial which delimit between them an annular cylindrical chamber (22) in which exhaust gases are admitted which enter the muffler, the inner tube (14) being a perforated tube (28), a first open end (17) of which constitutes the single inlet for the gases into the muffler and the l the other opposite end (18) is closed, the internal wall of the external envelope being coated with a layer (24) of absorbent material which extends axially substantially over the entire perforated length (28) of the internal tube, characterized in that said other closed end of the inner tube is shaped (20) to cause the reflection of at least part of the gases which enter the inner tube. 2. Silencieux selon la revendication 1, caractérisé en ce que le coefficient de transmissibilité thermique du matériau constitutif de l'enveloppe extérieure (12) est supérieur à celui du matériau absorbant (24).2. Muffler according to claim 1, characterized in that the coefficient of thermal transmissibility of the material constituting the outer envelope (12) is greater than that of the absorbent material (24). 3. Silencieux selon l'une quelconque des revendica­tions précédentes, caractérisé en ce que l'enveloppe extérieure (12) comporte une zone annelée (30) pour augmenter la surface d'échange thermique avec l'exté­rieur.3. Muffler according to any one of the preceding claims, characterized in that the outer casing (12) has a corrugated zone (30) to increase the heat exchange surface with the outside. 4. Silencieux selon l'une quelconque des revendica­tions précédentes, caractérisé en ce que l'accroissement de section entre le tube intérieur (14) et l'enveloppe extérieure (12) dans leurs zones qui délimitent la chambre annulaire (22) est dans un rapport comporis entre 2 et 5.4. Muffler according to any one of the preceding claims, characterized in that the increase in section between the inner tube (14) and the outer casing (12) in their zones which delimit the annular chamber (22) is in a ratio between 2 and 5. 5. Partie de ligne d'échappement pour l'écoulement des gaz d'échappement d'un moteur à combustion interne, du type comportant une enveloppe externe continue de section sensiblement constante renfermant au moins un bloc d'atténuation acoustique positionné longitudinale­ment dans l'enveloppe de façon à délimiter au moins un tronçon de transfert du fluide de longueur déterminée de manière que ce dernier participe à la fonction d'atté­nuation acoustique de la partie de ligne d'échappement, caractérisée en ce que au moins un tronçon de la partie de ligne d'échappement est réalisé de façon à constituer un silencieux selon l'une des revendications précéden­tes, ladite enveloppe externe continue de section sensiblement constante formant l'enveloppe cylindrique extérieure (12) du silencieux.5. Part of the exhaust line for the flow of exhaust gases from an internal combustion engine, of the type comprising a continuous external envelope of substantially constant section enclosing at least one acoustic attenuation block positioned longitudinally in the envelope so as to delimit at least one transfer section of the fluid of determined length so that the latter participates in the function acoustic attenuation of the part of the exhaust line, characterized in that at least one section of the part of the exhaust line is produced so as to constitute a silencer according to one of the preceding claims, said outer casing continues to substantially constant section forming the outer cylindrical casing (12) of the silencer. 6. Partie de ligne d'échappement selon la revendi­cation 5, caractérisée en ce que le tronçon formant silencieux est le tronçon d'entrée de la ligne d'échap­pement.6. Part of the exhaust line according to claim 5, characterized in that the section forming a silencer is the inlet section of the exhaust line. 7. Partie de ligne d'échappement selon l'une des revendications 5 ou 6, caractérisée en ce qu'elle comporte une portion de raccordement qui relie la paroi interne de ladite enveloppe externe à ladite extrémité ouverte du tube intérieur.7. Part of the exhaust line according to one of claims 5 or 6, characterized in that it comprises a connection portion which connects the inner wall of said outer casing to said open end of the inner tube.
EP90400167A 1989-01-27 1990-01-22 Exhaust gas silencer and exhaust section including such a silencer Withdrawn EP0380394A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901064 1989-01-27
FR8901064A FR2642470A1 (en) 1989-01-27 1989-01-27 SILENCER FOR EXHAUST GASES AND EXHAUST LINE PART COMPRISING SUCH SILENCER

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EP90400167A Withdrawn EP0380394A1 (en) 1989-01-27 1990-01-22 Exhaust gas silencer and exhaust section including such a silencer

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KR100755722B1 (en) * 2007-03-08 2007-09-05 한국뉴매틱(주) Silencer for pneumatic device
JP5291206B2 (en) * 2009-02-27 2013-09-18 中国科学院声学研究所 Silencing method and silencer based on ray deflection theory
US9404365B2 (en) * 2013-02-13 2016-08-02 Taylor's Industrial Coatings, Inc. Steam diffusing apparatus and related methods
JP2014233796A (en) * 2013-06-03 2014-12-15 株式会社ディスコ Processing device
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US2913870A (en) * 1955-01-19 1959-11-24 George E Lashley Exhaust system
FR1129207A (en) * 1955-07-23 1957-01-17 Improvements made to silencers or exhaust pipes
US3710891A (en) * 1971-08-25 1973-01-16 R Flugger Automotive muffler
US3732948A (en) * 1971-09-20 1973-05-15 Nat Southwire Aluminum Muffler for aluminum cell tapping crucible
US3901350A (en) * 1972-06-30 1975-08-26 Eberspaecher J Muffler for a rotor vehicle internal combustion engine
FR2282533A1 (en) * 1974-08-20 1976-03-19 Burgess Ind QUIET
FR2589195A1 (en) * 1985-10-25 1987-04-30 Vibrasonic Soundproofed chimney for hot gases ejected from an exhaust pipe

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Publication number Priority date Publication date Assignee Title
EP0420266A2 (en) * 1989-09-29 1991-04-03 Tanabe Seiyaku Co., Ltd. Chromene or thiochromene derivatives, process for preparing the same, intermediate therefor, pharmaceutical compositions containing said derivatives and the use of said derivatives
EP0420266A3 (en) * 1989-09-29 1991-09-11 Tanabe Seiyaku Co., Ltd. Chromene or thiochromene derivatives, process for preparing the same, intermediate therefor, pharmaceutical compositions containing said derivatives and the use of said derivatives

Also Published As

Publication number Publication date
US5109950A (en) 1992-05-05
FR2642470A1 (en) 1990-08-03

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