FR2790788A1 - Silencer for motor vehicle exhaust has chamber defining venturi and outer casing with sound absorbing infill - Google Patents

Silencer for motor vehicle exhaust has chamber defining venturi and outer casing with sound absorbing infill Download PDF

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Publication number
FR2790788A1
FR2790788A1 FR9903266A FR9903266A FR2790788A1 FR 2790788 A1 FR2790788 A1 FR 2790788A1 FR 9903266 A FR9903266 A FR 9903266A FR 9903266 A FR9903266 A FR 9903266A FR 2790788 A1 FR2790788 A1 FR 2790788A1
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FR
France
Prior art keywords
silencer
diffuser
regulator according
expansion chamber
fact
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Granted
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FR9903266A
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French (fr)
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FR2790788B1 (en
Inventor
Eric Penel
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PENEL RECH ET DEV
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PENEL RECH ET DEV
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Priority to FR9903266A priority Critical patent/FR2790788B1/en
Publication of FR2790788A1 publication Critical patent/FR2790788A1/en
Application granted granted Critical
Publication of FR2790788B1 publication Critical patent/FR2790788B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • 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
    • F01N1/085—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using a central core throttling gas passage
    • 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
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers

Abstract

The silencer for a motor vehicle exhaust has a chamber (3) of tapering cross section leading to a Venturi (2) and a conical diffuser (4). All these components are mounted in a tubular casing (1) defining an annular gap (5) around the components which is filled with a sound absorbing material.

Description

La présente invention a pour objet unThe subject of the present invention is a

silencieux-détendeur pour moteurs à explosions.  silencer-regulator for explosion engines.

Il concerne le domaine industriel et commercial de la fabrication et de la diffusion d'équipements pour moteurs thermiques et est en particulier destiné aux véhicules routiers de tous types, qu'ils soient propulsés par un moteur à deux ou quatre  It concerns the industrial and commercial field of manufacturing and distribution of equipment for heat engines and is in particular intended for road vehicles of all types, whether powered by a two or four engine

temps, diesel ou à essence.time, diesel or petrol.

Les nuisances sonores dues aux moteurs à combustion interne, et en tout premier lieu à ceux équipant des véhicules, ont sensiblement diminuées durant les dernières décennies, mais elles demeurent encore gênantes dans le cas surtout des moteurs de faible  The noise nuisance due to internal combustion engines, and in the first place to those fitted to vehicles, has significantly decreased in recent decades, but they are still troublesome in the case especially of low-power engines.

cylindrée ou, au contraire, des moteur de poids lourds.  displacement or, on the contrary, heavy-duty engines.

Pour réduire encore les émissions sonores des moteurs thermiques, l'utilisation des techniques connues entraîne en général soit une augmentation prohibitive de l'encombrement des dispositifs de détente et d'échappement, soit une baisse de rendement, soit encore, comme on le voit aujourd'hui sur beaucoup de voitures particulières, le fractionnement de ces équipements, ce qui se traduit bien sûr par un coût de revient plus élevé  To further reduce noise emissions from combustion engines, the use of known techniques generally leads either to a prohibitive increase in the size of the expansion and exhaust devices, or to a reduction in efficiency, or even, as we see today on many passenger cars, the splitting of this equipment, which of course results in a higher cost price

du véhicule.of the vehicle.

On connaît des pots d'échappement combinant les fonctions de détente et de modération du niveau sonore, utilisés en particulier pour les petites motos ou les scooters, et semblables par exemple au dispositif décrit dans le brevet N 2 751 029, qui consiste en un silencieux comprenant un corps cylindrique extérieur, des plaques d'extrémité avant et arrière, des plaques poreuses dans le corps et des plaques de séparation subdivisant l'intérieur du corps, dans lequel trois ou  Exhaust pipes are known which combine the functions of relaxation and moderation of the sound level, used in particular for small motorcycles or scooters, and similar for example to the device described in patent N 2 751 029, which consists of a silencer comprising an outer cylindrical body, front and rear end plates, porous plates in the body and partition plates dividing the interior of the body, wherein three or more

quatre éléments sont superposés et joints par soudage.  four elements are superimposed and joined by welding.

Des tuyaux d'échappement sont reliés et soudés aux plaques avec d'autres éléments. Le corps a une structure à couches multiples ayant des panneaux intérieurs et extérieurs formés pour comprimer au montage une unité  Exhaust pipes are connected and welded to the plates with other elements. The body has a multi-layered structure having interior and exterior panels formed to compress upon assembly a unit

intérieure fixée au corps.interior attached to the body.

Ce genre d'appareil est complexe à réaliser et  This kind of device is complex to produce and

l'efficacité des deux fonctions est souvent médiocre.  the effectiveness of the two functions is often poor.

Le dispositif selon la présente invention a pour objectif de proposer un pot d'échappement qui tout en étant relativement simple et d'un coût de fabrication modéré permet d'améliorer le rendement thermodynamique d'un moteur thermique tout en diminuant son émission sonore. Il est constitué successivement, d'amont en aval, d'une chambre de détente conique à section décroissante, d'un "venturi" et d'un diffuseur également conique, mais à section croissante, ces trois éléments étant enfermés dans une enceinte tubulaire coaxiale externe déterminée de manière à créer sur toute sa longueur un espace annulaire autour des trois éléments sus-mentionnés, cet espace étant rempli d'un matériau  The device according to the present invention aims to provide an exhaust pipe which, while being relatively simple and of moderate manufacturing cost, improves the thermodynamic efficiency of a heat engine while reducing its noise emission. It consists successively, from upstream to downstream, of a conical expansion chamber with decreasing section, of a "venturi" and of a diffuser also conical, but of increasing section, these three elements being enclosed in a tubular enclosure external coaxial determined so as to create over its entire length an annular space around the three above-mentioned elements, this space being filled with a material

absorbant le son.absorbing sound.

Sur les dessins annexés, donnés à titre d'exemples non limitatifs de formes de réalisation de l'objet de l'invention: la figure 1 représente une coupe longitudinale axiale du dispositif dans son ensemble et la figure 2 montre, dans les mêmes conditions, une variante d'exécution dont la chambre de  In the accompanying drawings, given by way of nonlimiting examples of embodiments of the subject of the invention: FIG. 1 represents an axial longitudinal section of the device as a whole and FIG. 2 shows, under the same conditions, an execution variant including the

détente et le diffuseur sont réalisés en tôle perforée.  trigger and diffuser are made of perforated sheet metal.

Le dispositif, figures 1 et 2, est constitué d'une enceinte cylindrique 1 de section cylindrique ou ovale dans laquelle un tube de Venturi 2 est inséré entre une chambre de détente 3 située à l'amont et un diffuseur 4 situé à l'aval pour former le conduit de passage des  The device, Figures 1 and 2, consists of a cylindrical enclosure 1 of cylindrical or oval section in which a Venturi tube 2 is inserted between an expansion chamber 3 located upstream and a diffuser 4 located downstream to form the passage duct for

gaz de préférence rectiligne.preferably straight gas.

L'enceinte 1 est formée d'une paroi extérieure coaxiale au conduit de passage des gaz. Entre les deux, est ménagé sur toute la longueur un espace annulaire 5 qui est rempli d'un matériau absorbant les sons tel que la laine de verre. Aux deux extrémités, des raccords amont 6 et aval 7 assurent la solidarisation de la paroi extérieure 1, des éléments constituant le conduit de passage des gaz et des tubulures d'entrée 8 et de sortie 9. La chambre de détente 3 est constituée d'un cône de section décroissante, dont le diamètre de la base est sensiblement plus grand que celui de la tubulure d'entrée 8 de façon à provoquer une expansion des gaz à  The enclosure 1 is formed by an outer wall coaxial with the gas passage duct. Between the two, an annular space 5 is provided over the entire length which is filled with a sound-absorbing material such as glass wool. At the two ends, upstream 6 and downstream 7 connections secure the external wall 1, elements constituting the gas passage duct and inlet 8 and outlet pipes 9. The expansion chamber 3 consists of a cone of decreasing section, the diameter of the base of which is appreciably larger than that of the inlet pipe 8 so as to cause an expansion of the gases to

l'entrée du système.the system entry.

Le tube de Venturi 2 est formé d'un élément tubulaire présentant un étranglement grâce à une paroi cintrée à convexité dirigé vers l'intérieur. Il assure une continuité entre la chambre de détente 3 et le  The Venturi tube 2 is formed of a tubular element having a constriction thanks to a curved wall with convexity directed inwards. It ensures continuity between the expansion chamber 3 and the

diffuseur 4.diffuser 4.

Ce dernier est formé d'un cône à section croissante d'une longueur supérieure au double de celle  The latter is formed by a cone with increasing section of a length greater than double that

de la chambre de détente.from the relaxation room.

Les parois de la chambre de détente 3, du venturi 2 et du diffuseur 4 peuvent tous être tout ou partie réalisés en tôle perforée ou en tôle pleine, selon que l'on souhaite favoriser l'aspect rendement, ou  The walls of the expansion chamber 3, of the venturi 2 and of the diffuser 4 can all be all or part made of perforated sheet metal or full sheet metal, depending on whether one wishes to favor the performance aspect, or

l'aspect sonore du silencieux.the sound aspect of the silencer.

Les gaz, en arrivant dans la chambre de détente 3, se détendent, donc les ondes sonores sont en partie absorbées par les parois de ladite chambre, passent ensuite par le "venturi" 2, afin de retrouver une vitesse suffisante pour générer une onde favorable à un meilleur "vidage" de la chambre de combustion. La partie diffuseur 4 sert quant à elle, de par sa forme conique, à rediminuer la vitesse atteinte dans le venturi, afin d'augmenter les vecteurs de pression générés de par sa forme sur sa paroi, ce qui a pour effet de diminuer encore les ondes sonores émises par le silencieux à l'air  The gases, arriving in the expansion chamber 3, relax, therefore the sound waves are partly absorbed by the walls of said chamber, then pass through the "venturi" 2, in order to find a speed sufficient to generate a favorable wave better "emptying" of the combustion chamber. The diffuser part 4 is used, by its conical shape, to reduce the speed reached in the venturi, in order to increase the pressure vectors generated by its shape on its wall, which has the effect of further reducing the sound waves emitted by the air silencer

libre.free.

Le positionnement des divers éléments constitutifs donne à l'objet de l'invention un maximum d'effets utiles qui n'avaient pas été, à ce jour, obtenus  The positioning of the various constituent elements gives the object of the invention a maximum of useful effects which had not, to date, been obtained.

par des dispositifs similaires.by similar devices.

Claims (6)

REVENDICATIONS 1 . Silencieux-détendeur pour moteurs à explosions, destiné en particulier aux véhicules routiers de tous types, qu'ils soient propulsés par un moteur à  1. Muffler for explosion engines, intended in particular for road vehicles of all types, whether powered by a deux ou quatre temps, diesel ou à essence.  two or four stroke, diesel or petrol. caractérisé en ce qu'il comporte un conduit de passage des gaz constitué successivement, d'amont en aval, d'une chambre de détente (3) conique à section décroissante, d'un tube de Venturi (2) et d'un diffuseur (4) également conique, mais à section croissante, ce conduit de passage des gaz étant logé dans une enceinte cylindrique (1) coaxiale externe, de section cylindrique ou ovale, déterminée de manière à créer sur toute sa longueur un espace annulaire (5) autour dudit conduit,  characterized in that it comprises a gas passage duct successively constituted, from upstream to downstream, of a conical expansion chamber (3) with decreasing section, a Venturi tube (2) and a diffuser (4) also conical, but with increasing section, this gas passage duct being housed in an external coaxial cylindrical enclosure (1), of cylindrical or oval section, determined so as to create an annular space (5) over its entire length around said conduit, cet espace étant rempli d'un matériau absorbant le son.  this space being filled with a sound absorbing material. 2 . Silencieux-détendeur selon la revendication 1, se caractérisant par le fait que le diamètre de la base de la chambre de détente (3) est sensiblement plus grand que celui de la tubulure d'entrée (8) du dispositif de façon à provoquer une expansion des  2. Silencer-regulator according to claim 1, characterized in that the diameter of the base of the expansion chamber (3) is substantially larger than that of the inlet manifold (8) of the device so as to cause expansion of gaz à l'entrée du système.gas at the inlet of the system. 3 . Silencieux-détendeur selon l'une  3. Silencer-regulator according to one quelconque des revendications précédentes, se  any of the preceding claims caractérisant par le fait que le diffuseur (4) a une longueur supérieure au double de celle de la chambre de  characterized by the fact that the diffuser (4) has a length greater than twice that of the détente.relaxation. 4 . Silencieux-détendeur selon l'une  4. Silencer-regulator according to one quelconque des revendications précédentes, se  any of the preceding claims caractérisant par le fait que le tube de Venturi (2) assure la continuité entre la chambre de détente (3) et le diffuseur (4), et est formé d'un élément tubulaire comportant une paroi cintrée à convexité dirigé vers l'intérieur. 50 Silencieux-détendeur selon l'une  characterized by the fact that the Venturi tube (2) ensures continuity between the expansion chamber (3) and the diffuser (4), and is formed of a tubular element comprising a curved wall with convexity directed inwards. 50 Silencer-regulator according to one quelconque des revendications précédentes, se  any of the preceding claims caractérisant par le fait qu'une partie ou la totalité de la chambre de détente (3) ou du tube de Venturi (2) ou du  characterized by the fact that part or all of the expansion chamber (3) or the Venturi tube (2) or the diffuseur (4) est réalisé en tôle perforée.  diffuser (4) is made of perforated sheet metal. 6 . Silencieux-détendeur selon l'une  6. Silencer-regulator according to one quelconque des revendications 1 à 4, se caractérisant par  any of claims 1 to 4, characterized by le fait que la chambre de détente (3), le tube de Venturi (2) et le diffuseur (4) sont réalisés entièrement en tôle  the fact that the expansion chamber (3), the Venturi tube (2) and the diffuser (4) are made entirely of sheet metal pleine.full. 7 . Silencieux-détendeur selon l'une  7. Silencer-regulator according to one quelconque des revendications précédentes, se  any of the preceding claims caractérisant par le fait qu'il comporte à ses deux extrémités, des raccords amont (6) et aval (7) agencés pour assurer la solidarisation de l'enceinte cylindrique (1), des éléments constituant le conduit de passage des gaz et des tubulures d'entrée (8) et de sortie (9) du dispositif.  characterized by the fact that it has at its two ends, upstream (6) and downstream (7) connections arranged to secure the cylindrical enclosure (1), elements constituting the gas passage pipe and the pipes inlet (8) and outlet (9) of the device.
FR9903266A 1999-03-12 1999-03-12 MUFFLER-REGULATOR FOR EXPLOSION ENGINES Expired - Fee Related FR2790788B1 (en)

Priority Applications (1)

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FR9903266A FR2790788B1 (en) 1999-03-12 1999-03-12 MUFFLER-REGULATOR FOR EXPLOSION ENGINES

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FR9903266A FR2790788B1 (en) 1999-03-12 1999-03-12 MUFFLER-REGULATOR FOR EXPLOSION ENGINES

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1624163A1 (en) * 2004-08-06 2006-02-08 Robert Bosch Gmbh Sound insulating device especially for a heating apparatus
CN102892983A (en) * 2010-05-18 2013-01-23 格瑞克明尼苏达有限公司 Low ice pneumatic motor exhaust muffler
CN104132001A (en) * 2013-04-18 2014-11-05 速飞得(浙江)自动化科技有限公司 Silencing cylinder of automatic cutting machine
US20230128285A1 (en) * 2021-10-26 2023-04-27 Bret Allen Dooley Compact slip-in spark arrestor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB986576A (en) * 1961-09-07 1965-03-17 Gruenzweig & Hartmann Silencer
GB2070682A (en) * 1980-02-09 1981-09-09 Engineering Components Ltd Silencer for the inlet to an air cleaner
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
US5174113A (en) * 1989-12-20 1992-12-29 Devil, Societe Anonyme Exhaust outlet with venturi
FR2736966A1 (en) * 1995-07-17 1997-01-24 Ferri Alain EXHAUST MUFFLER FOR EXPLOSION ENGINES, FOR AIRCRAFT
FR2751029A1 (en) 1996-07-11 1998-01-16 Honda Motor Co Ltd Silencer for motor vehicle internal combustion engine exhaust

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB986576A (en) * 1961-09-07 1965-03-17 Gruenzweig & Hartmann Silencer
GB2070682A (en) * 1980-02-09 1981-09-09 Engineering Components Ltd Silencer for the inlet to an air cleaner
US4690245A (en) * 1983-03-17 1987-09-01 Stemco, Inc. Flattened venturi, method and apparatus for making
US5174113A (en) * 1989-12-20 1992-12-29 Devil, Societe Anonyme Exhaust outlet with venturi
FR2736966A1 (en) * 1995-07-17 1997-01-24 Ferri Alain EXHAUST MUFFLER FOR EXPLOSION ENGINES, FOR AIRCRAFT
FR2751029A1 (en) 1996-07-11 1998-01-16 Honda Motor Co Ltd Silencer for motor vehicle internal combustion engine exhaust

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1624163A1 (en) * 2004-08-06 2006-02-08 Robert Bosch Gmbh Sound insulating device especially for a heating apparatus
CN102892983A (en) * 2010-05-18 2013-01-23 格瑞克明尼苏达有限公司 Low ice pneumatic motor exhaust muffler
CN104132001A (en) * 2013-04-18 2014-11-05 速飞得(浙江)自动化科技有限公司 Silencing cylinder of automatic cutting machine
US20230128285A1 (en) * 2021-10-26 2023-04-27 Bret Allen Dooley Compact slip-in spark arrestor
US11661873B2 (en) * 2021-10-26 2023-05-30 Bret A. Dooley Compact slip-in spark arrestor

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