EP1209348A1 - Silencing device, particularly for turbocharged engine - Google Patents

Silencing device, particularly for turbocharged engine Download PDF

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Publication number
EP1209348A1
EP1209348A1 EP01402977A EP01402977A EP1209348A1 EP 1209348 A1 EP1209348 A1 EP 1209348A1 EP 01402977 A EP01402977 A EP 01402977A EP 01402977 A EP01402977 A EP 01402977A EP 1209348 A1 EP1209348 A1 EP 1209348A1
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EP
European Patent Office
Prior art keywords
cylinder
partition
segment
forming
toric
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Granted
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EP01402977A
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German (de)
French (fr)
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EP1209348B1 (en
Inventor
Henri Lepoutre
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WEVISTA
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Westaflex-Automobile SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
    • F02M35/1261—Helmholtz resonators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1283—Manufacturing or assembly; Connectors; Fixations

Definitions

  • the present invention relates to a device forming a silencer to be fitted between an air supply duct of combustion coming out for example from an engine turbine and an outlet duct through which the air or the fluid of combustion towards, for example, an exchanger thermal.
  • these devices mufflers feature a hollow shaped main body cylindrical-circular; an inlet fitting and a fitting cylindro-circular outlet each having a diameter less than the diameter of the main body and mounted on the side and on the other side of the main body, at least one part forming partition defining with the inner surface of the body main hollow at least two toric chambers in the interior space of the main body defined, in section transverse, between the diameter of the body and the diameter of fittings, the toric chambers being in communication direct with the virtual cylinder, which is defined by the diameter of the fittings and through which the fluid of a connection to each other, through a slot circular extending around the entire periphery of this cylinder virtual.
  • the devices of the prior art present several disadvantages.
  • the circular slots extending around the entire periphery of the virtual cylinder are there, for reasons of ease of manufacture, too large dimensions. It follows, during the flow of air in the virtual cylinder between the inlet fitting and the fitting outlet, significant pressure losses of the fluid which goes into the resonance chambers.
  • the present invention aims to overcome these disadvantages by proposing a new device forming muffler mounted between an air intake duct and a easy air or fluid outlet manufacture, and in particular does not require many stamping tools and which at the same time allows also to limit the pressure drops inside the quiet.
  • the device forming silencer intended to be mounted between a first duct air or fluid inlet and a second outlet duct of air or fluid, this device being notably mounted between an engine turbine and a heat exchanger;
  • the muffler consisting of a hollow main body of cylindrical shape, an inlet fitting and a fitting cylindrical outlet of cross section less than the cross section of the main body and at least one part forming a partition defining with the inner surface of the main hollow body at least two toric chambers in the main body region that is around the virtual cylinder defined by the virtual extension of the two connections towards each other, the toric chambers being in direct communication with this virtual cylinder each along a slit extending around the entire periphery of the virtual cylinder, is characterized in that the chambers rings are partly separated from the virtual cylinder by the part forming a partition and / or one and / or both conduits between which is mounted the silencer.
  • the or the parts forming the partition is (are) one (s) part (s) cylindrical (s) whose generating curve in the plane parallel to the direction of fluid flow has a first line segment defining a wall of separation between the toric chambers and the cylinder virtual, a second line segment defining a separation between two toric chambers, and a third line segment forming a corner with the second segment, and there is formed in the inner surface of the hollow body a annular recess, the corner abuts against a side wall of the recess, so that when one weld this third segment in this recess, we get simple precise positioning of the workpiece forming a partition, and therefore a precise dimension of the chambers of resonance with the possibility of carrying out a manufacture on a large scale without having to measure each time with precision positioning of the partition.
  • the width dimension of the recess is substantially equal to the dimension of the third line segment of the part forming a partition. This improves the accuracy even more positioning.
  • the main hollow body consists of two bells identical which can be connected to each other at the level of their outer edge.
  • the bells consist of a cylinder whose curve generator in the plane of the cylinder axis, namely the fluid flow axis, consists of a first line segment substantially parallel to the axis of flow and corresponding to a diameter substantially equal to the diameter of the inlet or outlet ducts, a second line segment substantially parallel to the first line segment but at a greater distance from the axis of the cylinder and a third distance straight line even larger from the cylinder axis so to define a recess in cooperation with the third segment of the other bell.
  • auxiliary toroidal chamber communicating with the interior of the virtual cylinder by through an opening spanning less than 360 °, especially less than 240 °, preferably less than 120 °.
  • the third bedroom is formed by adding a second internal partition with the same shape as the first partition.
  • Figure 1 shows a first mode of production of a device according to the invention.
  • Figure 2 shows another mode of realization of a device according to the invention.
  • FIG. 1 there is described a mounted silencer between an air inlet duct 1, which is connected on the other goes to the turbine of an engine (not shown), and a outlet duct 2 leading directly or indirectly through through other conduits to a heat exchanger.
  • the air flows between line 1 and line 2.
  • the device can also be used with a flow air in the other direction, the duct 2 becoming the duct inlet and conduit 1 the outlet conduit.
  • This muffler remove or decrease noise generated by the turbine of the turbo engine. To do so, we uses the well-known technique of the Helmholtz resonator.
  • the silencer consists of a hollow main body 3 of cylindrical-circular shape.
  • This main cylindrical-circular body consists of a first circular cylinder 4 forming the inlet connection, of a second cylinder 4 ' circular forming the outlet fitting, a third circular cylinder 5, a fourth circular cylinder 5 ' and a fifth circular cylinder 6, the cylinders 5, 5 ' and 6 circulars defining the interior region of the quiet.
  • the diameter of the circular cylinder 6 is a slightly larger than the diameter of the 5 and 5 'cylinders circular, for example from 0.2 to 5 mm.
  • One piece 8 cylindrical defines inside the main body two Helmholtz rooms 9 and 10.
  • This part 8 forming a partition is a cylindrical part whose generating curve in the plane of the figure, which is a plane parallel to the direction of fluids, consists of a first line segment 11 substantially parallel to the axis flow, of a second line segment 12 intermediate, which defines the partition, and a third line segment 13 at a greater distance from the axis than the first straight line 11.
  • Chamber 9, in the plane of the figure, is delimited by the wall of the main body, by the partition 12 and by the line segment 11.
  • the chamber 10 is delimited, on the one hand by the wall of the external body, and on the other hand by the partition 12 and by the part of the wall of the duct 2 which protrudes inside the hollow body.
  • This room 10 communicates with the interior of the virtual cylinder by through an annular slot 15.
  • the length of the segment 13 on the right is substantially equal to the width in this plane of cylinder 6.
  • This cylinder 6 is welded to the cylinder 13 by welding or brazing.
  • connections 4 and 4 have diameters slightly larger than the diameters of conduits 1 and 2 and are welded to them after being threaded through the conduits.
  • the silencer (the hollow body and the part forming partition) is made of stainless steel 0.6 or 0.8 mm thick.
  • the hollow body consists of two halves, which are in the form of two bells.
  • Each bell has a first small circular cylinder and a second cylinder larger diameter circular and a third cylinder circular slightly larger in diameter than the second.
  • the third largest circular cylinder diameter can be formed relative to the second cylinder by stamping.
  • the two halves are joined at the level of their outer edge at the weld joint, the third cylinders of the two bells form, after having have been welded to each other at their edge 22 outside, the positioning cylinder 6.
  • Figure 2 shows another mode of variant embodiment of a device according to the invention.
  • the identical parts to those of figure 1 are there designated by the same reference numerals.
  • This embodiment differs from the first one part by the presence of a second part 8 'forming partition of identical shape to the first part 8 forming partition and on the other hand, by the presence of a third toric chamber 30.
  • This third toric chamber 30 is in communication with the interior of the outlet duct 2 only by a rectangular window 31 extending over 120 ° from the periphery of the outlet duct 2.
  • This conception gives room 30 a resonant frequency relatively low, compared to the frequencies of the 9 'chambers and 10 ', allowing the frequency band to be widened over which acts the muffler.
  • this room 30 does not work according to the principle of a Helmholtz resonator but according to the principle of an open tube at both ends, which meet at the same connection point.
  • Room 8 ', via its segment 11 ', is a short distance from conduit 2. However, one can weld them together or not do it, as it is shown in figure. A slight play between the two is not effect not detrimental to acoustics. Segments 13 and 13 'of the two parts 8 and 8' forming a partition are the same dimensions, i.e. half the width of the recess ring finger 6.
  • each of the segments 13 and 13 ' (at know the ends forming with segments 12 and 12 'a corner) abuts against a respective stop formed by the side walls of the recess 6.
  • the two parts 8 and 8 ' by this positioning wedge against stop, can be precisely positioned.
  • the fact that the sum of the lengths of two segments 13 and 13 'or substantially equal to the width of the recess improves even more positioning accuracy.
  • the silencers shown in Figures 1 and 2 do not are not symmetrical. According to another embodiment possible they could be. In addition, in the case of non-symmetrical embodiments they can be used with one-way or one-way air flow the other.

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

Abstract

Dispositif formant silencieux, destiné à être monté entre un premier conduit 1 d'entrée d'air ou de fluide et un deuxième conduit 2 de sortie d'air ou de fluide, ce dispositif étant notamment monté entre une turbine de moteur et un échangeur thermique ; le silencieux étant constitué d'un corps 3 principal creux cylindrique, d'un raccord 4 d'entrée et d'un raccord 4' de sortie cylindrique ayant une ou des sections droites inférieures à celle du corps 3 principal et d'au moins une pièce 8 formant cloison définissant avec la surface intérieure du corps principal creux au moins deux chambres 9, 10 toriques. <IMAGE>Device forming a silencer, intended to be mounted between a first duct 1 for air or fluid inlet and a second duct 2 for air or fluid outlet, this device being notably mounted between a motor turbine and a heat exchanger ; the silencer consisting of a cylindrical hollow main body 3, an inlet connector 4 and a cylindrical outlet connector 4 'having one or more cross sections smaller than that of the main body 3 and at least one piece 8 forming a partition defining with the inner surface of the hollow main body at least two toric chambers 9, 10. <IMAGE>

Description

La présente invention concerne un dispositif formant silencieux à monter entre un conduit d'amenée d'air de combustion sortant par exemple d'une turbine de moteur et un conduit de sortie par lequel sort l'air ou le fluide de combustion en direction par exemple d'un échangeur thermique.The present invention relates to a device forming a silencer to be fitted between an air supply duct of combustion coming out for example from an engine turbine and an outlet duct through which the air or the fluid of combustion towards, for example, an exchanger thermal.

On connaít déjà des silencieux de ce genre dans l'art antérieur. Dans l'art antérieur, ces dispositifs de silencieux comportent un corps principal creux de forme cylindro-circulaire ; un raccord d'entrée et un raccord de sortie cylindro-circulaires ayant chacun un diamètre inférieur au diamètre du corps principal et montés de part et d'autre du corps principal, au moins une pièce formant cloison définissant avec la surface intérieure du corps principal creux au moins deux chambres toriques dans l'espace intérieur du corps principal définies, en section transversale, entre le diamètre du corps et le diamètre des raccords, les chambres toriques étant en communication directe avec le cylindre virtuel, qui est défini par le diamètre des raccords et dans lequel passe le fluide d'un raccord à l'autre, par l'intermédiaire d'une fente circulaire s'étendant sur tout le pourtour de ce cylindre virtuel.We already know such mufflers in prior art. In the prior art, these devices mufflers feature a hollow shaped main body cylindrical-circular; an inlet fitting and a fitting cylindro-circular outlet each having a diameter less than the diameter of the main body and mounted on the side and on the other side of the main body, at least one part forming partition defining with the inner surface of the body main hollow at least two toric chambers in the interior space of the main body defined, in section transverse, between the diameter of the body and the diameter of fittings, the toric chambers being in communication direct with the virtual cylinder, which is defined by the diameter of the fittings and through which the fluid of a connection to each other, through a slot circular extending around the entire periphery of this cylinder virtual.

Les dispositifs de l'art antérieur présentent plusieurs inconvénients. D'une part, les fentes circulaires s'étendant sur tout le pourtour du cylindre virtuel y sont, pour des raisons de facilité de fabrication, de trop grandes dimensions. Il s'ensuit, pendant l'écoulement de l'air dans le cylindre virtuel entre le raccord d'entrée et le raccord de sortie, des pertes de charge importantes du fluide qui passe dans les chambres de résonance.The devices of the prior art present several disadvantages. On the one hand, the circular slots extending around the entire periphery of the virtual cylinder are there, for reasons of ease of manufacture, too large dimensions. It follows, during the flow of air in the virtual cylinder between the inlet fitting and the fitting outlet, significant pressure losses of the fluid which goes into the resonance chambers.

En outre, lors de la mise en place de ce type de silencieux, le positionnement de la pièce formant cloison est très important. En effet, la largeur des chambres toriques doit être fonction de manière précise de la fréquence des ondes sonores que l'on souhaite amortir. Par conséquent, il convient de positionner de manière très précise la pièce formant cloison. Cela prend beaucoup de temps, ce qui dans une optique de fabrication à grande échelle pose problème. Enfin, la fabrication elle-même du corps principal creux est compliquée à réaliser.In addition, when setting up this type of silent, positioning of the part forming a partition is very important. The width of the rooms torics must be a precise function of the frequency of the sound waves that one wishes to dampen. Through therefore, it is advisable to position in a very specifies the part forming a partition. It takes a lot of time, which from a large manufacturing perspective scale is problematic. Finally, the manufacture itself of main hollow body is complicated to realize.

La présente invention vise à pallier ces inconvénients en proposant un nouveau dispositif formant silencieux monté entre un conduit d'entrée d'air et un conduit de sortie d'air ou de fluide qui est facile à fabriquer, et notamment ne nécessite pas de nombreux outillages d'emboutissage et qui en même temps permet également de limiter les pertes de charge à l'intérieur du silencieux.The present invention aims to overcome these disadvantages by proposing a new device forming muffler mounted between an air intake duct and a easy air or fluid outlet manufacture, and in particular does not require many stamping tools and which at the same time allows also to limit the pressure drops inside the quiet.

Suivant l'invention, le dispositif formant silencieux, destiné à être monté entre un premier conduit d'entrée d'air ou de fluide et un deuxième conduit de sortie d'air ou de fluide, ce dispositif étant notamment monté entre une turbine de moteur et un échangeur thermique ; le silencieux étant constitué d'un corps principal creux de forme cylindrique, d'un raccord d'entrée et d'un raccord de sortie cylindriques de section droite inférieure à la section droite du corps principal et d'au moins une pièce formant cloison définissant avec la surface intérieure du corps principal creux au moins deux chambres toriques dans la région du corps principal qui se trouve autour du cylindre virtuel défini par le prolongement virtuel des deux raccords l'un vers l'autre, les chambres toriques étant en communication directe avec ce cylindre virtuel chacune suivant une fente s'étendant sur tout le pourtour du cylindre virtuel, est caractérisé en ce que les chambres toriques sont séparées en partie du cylindre virtuel par la pièce formant cloison et/ou l'un et/ou les deux conduits entre lesquels est monté le silencieux.According to the invention, the device forming silencer, intended to be mounted between a first duct air or fluid inlet and a second outlet duct of air or fluid, this device being notably mounted between an engine turbine and a heat exchanger; the muffler consisting of a hollow main body of cylindrical shape, an inlet fitting and a fitting cylindrical outlet of cross section less than the cross section of the main body and at least one part forming a partition defining with the inner surface of the main hollow body at least two toric chambers in the main body region that is around the virtual cylinder defined by the virtual extension of the two connections towards each other, the toric chambers being in direct communication with this virtual cylinder each along a slit extending around the entire periphery of the virtual cylinder, is characterized in that the chambers rings are partly separated from the virtual cylinder by the part forming a partition and / or one and / or both conduits between which is mounted the silencer.

En utilisant ainsi les parois externes des deux conduits d'entrée et de sortie et une paroi auxiliaire issue de la pièce formant cloison séparant les deux chambres en forme de corps, on s'assure que la dimension suivant le sens de l'écoulement de la fente de communication entre ces chambres et l'écoulement principal de fluide reste de petite dimension et on diminue ainsi les pertes de charge, et ce de manière simple sans nécessiter notamment d'outillages supplémentaires et de pièces supplémentaires. Thus using the outer walls of the two inlet and outlet ducts and an auxiliary wall from of the room forming a partition separating the two chambers in body shape, we make sure that the dimension according to the direction of the flow from the communication slot between these chambers and the main fluid flow remains small dimension and this reduces pressure losses, and this simple way without requiring in particular tools additional and additional parts.

Suivant un perfectionnement de l'invention, la ou les pièces formant cloison est (sont) une (des) pièce(s) cylindrique(s) dont la courbe génératrice dans le plan parallèle au sens de l'écoulement du fluide comporte un premier segment de droite définissant une paroi de séparation entre les chambres toriques et le cylindre virtuel, un second segment de droite définissant une séparation entre deux chambres toriques, et un troisième segment de droite formant un coin avec le deuxième segment, et il est formé dans la surface intérieure du corps creux un renfoncement annulaire, le coin venant buter contre une paroi latérale du renfoncement, de sorte que lorsque l'on soude ce troisième segment dans ce renfoncement, on obtient de manière simple un positionnement précis de la pièce formant cloison, et donc une dimension précise des chambres de résonance avec la possibilité de réaliser une fabrication à grande échelle sans avoir à chaque fois à mesurer avec précision le positionnement de la cloison.According to an improvement of the invention, the or the parts forming the partition is (are) one (s) part (s) cylindrical (s) whose generating curve in the plane parallel to the direction of fluid flow has a first line segment defining a wall of separation between the toric chambers and the cylinder virtual, a second line segment defining a separation between two toric chambers, and a third line segment forming a corner with the second segment, and there is formed in the inner surface of the hollow body a annular recess, the corner abuts against a side wall of the recess, so that when one weld this third segment in this recess, we get simple precise positioning of the workpiece forming a partition, and therefore a precise dimension of the chambers of resonance with the possibility of carrying out a manufacture on a large scale without having to measure each time with precision positioning of the partition.

Suivant un perfectionnement de l'invention, la dimension en largeur du renfoncement est sensiblement égale à la dimension du troisième segment de droite de la pièce formant cloison. On améliore ainsi encore plus la précision du positionnement.According to an improvement of the invention, the width dimension of the recess is substantially equal to the dimension of the third line segment of the part forming a partition. This improves the accuracy even more positioning.

Suivant un perfectionnement de l'invention, le corps principal creux est constitué de deux cloches identiques pouvant se raccorder l'une à l'autre au niveau de leur bord extérieur.According to an improvement of the invention, the main hollow body consists of two bells identical which can be connected to each other at the level of their outer edge.

Suivant un perfectionnement de l'invention, les cloches sont constituées d'un cylindre dont la courbe génératrice dans le plan de l'axe du cylindre, à savoir l'axe d'écoulement des fluides, est constitué d'un premier segment de droite sensiblement parallèle à l'axe d'écoulement et correspondant à un diamètre sensiblement égal au diamètre des conduits d'entrée ou de sortie, un deuxième segment de droite sensiblement parallèle au premier segment de droite mais à plus grande distance de l'axe du cylindre et d'un troisième segment de droite à distance encore plus grande de l'axe du cylindre pour ainsi définir un renfoncement en coopération avec le troisième segment de l'autre cloche.According to an improvement of the invention, the bells consist of a cylinder whose curve generator in the plane of the cylinder axis, namely the fluid flow axis, consists of a first line segment substantially parallel to the axis of flow and corresponding to a diameter substantially equal to the diameter of the inlet or outlet ducts, a second line segment substantially parallel to the first line segment but at a greater distance from the axis of the cylinder and a third distance straight line even larger from the cylinder axis so to define a recess in cooperation with the third segment of the other bell.

Suivant un perfectionnement de l'invention, il est formé au moins une troisième chambre torique auxiliaire communiquant avec l'intérieur du cylindre virtuel par l'intermédiaire d'une ouverture s'étendant sur moins de 360°, notamment moins de 240°, de préférence moins de 120°.According to an improvement of the invention, it is formed at least a third auxiliary toroidal chamber communicating with the interior of the virtual cylinder by through an opening spanning less than 360 °, especially less than 240 °, preferably less than 120 °.

Suivant un perfectionnement de l'invention, la troisième chambre est formée par ajout d'une deuxième cloison interne de même forme que la première cloison.According to an improvement of the invention, the third bedroom is formed by adding a second internal partition with the same shape as the first partition.

Aux dessins donnés uniquement à titre d'exemple, on décrit un mode de réalisation préféré de l'invention.In the drawings given only by way of example, a preferred embodiment of the invention is described.

La figure 1 représente un premier mode de réalisation d'un dispositif suivant l'invention ; etFigure 1 shows a first mode of production of a device according to the invention; and

La figure 2 représente un autre mode de réalisation d'un dispositif suivant l'invention.Figure 2 shows another mode of realization of a device according to the invention.

A la figure 1, il est décrit un silencieux monté entre un conduit 1 d'entrée d'air, qui est relié d'autre part à la turbine d'un moteur (non représentée), et un conduit 2 de sortie menant directement ou indirectement par l'intermédiaire d'autres conduits à un échangeur thermique. L'air s'écoule entre le conduit 1 et le conduit 2. Le dispositif peut également être utilisé avec un écoulement d'air dans l'autre sens, le conduit 2 devenant le conduit d'entrée et le conduit 1 le conduit de sortie. On souhaite à l'aide de ce silencieux supprimer ou diminuer des bruits générés par la turbine du moteur turbo. Pour se faire, on utilise la technique bien connue du résonateur de Helmholtz. Le silencieux est constitué d'un corps 3 principal creux de forme cylindro-circulaire. Ce corps principal cylindro-circulaire est constitué d'un premier cylindre 4 circulaire formant le raccord d'entrée, d'un deuxième cylindre 4' circulaire formant le raccord de sortie, d'un troisième cylindre 5 circulaire, d'un quatrième cylindre 5' circulaire et d'un cinquième cylindre 6 circulaire, les cylindres 5, 5' et 6 circulaires définissant la région intérieure du silencieux. Le diamètre du cylindre 6 circulaire est un petit peu plus grand que le diamètre des cylindres 5 et 5' circulaires, par exemple de 0,2 à 5 mm. Une pièce 8 cylindrique définit à l'intérieur du corps principal deux chambres 9 et 10 de Helmholtz. Cette pièce 8 formant cloison est une pièce cylindrique dont la courbe génératrice dans le plan de la figure, qui est un plan parallèle à la direction d'écoulement des fluides, est constituée d'un premier segment de droite 11 sensiblement parallèle à l'axe d'écoulement, d'un deuxième segment de droite 12 intermédiaire, qui définit la cloison, et d'un troisième segment de droite 13 à plus grande distance de l'axe que la première droite 11. La chambre 9, dans le plan de la figure, est délimitée par la paroi du corps principal, par la cloison 12 et par le segment de droite 11. Cette chambre 9, en forme de tore défini à une distance de l'axe d'écoulement égale au diamètre des raccords et des conduits, communique avec le cylindre virtuel défini par les deux conduits 1 et 2 par l'intermédiaire d'une fente 14 annulaire.In Figure 1, there is described a mounted silencer between an air inlet duct 1, which is connected on the other goes to the turbine of an engine (not shown), and a outlet duct 2 leading directly or indirectly through through other conduits to a heat exchanger. The air flows between line 1 and line 2. The device can also be used with a flow air in the other direction, the duct 2 becoming the duct inlet and conduit 1 the outlet conduit. We wish to using this muffler remove or decrease noise generated by the turbine of the turbo engine. To do so, we uses the well-known technique of the Helmholtz resonator. The silencer consists of a hollow main body 3 of cylindrical-circular shape. This main cylindrical-circular body consists of a first circular cylinder 4 forming the inlet connection, of a second cylinder 4 ' circular forming the outlet fitting, a third circular cylinder 5, a fourth circular cylinder 5 ' and a fifth circular cylinder 6, the cylinders 5, 5 ' and 6 circulars defining the interior region of the quiet. The diameter of the circular cylinder 6 is a slightly larger than the diameter of the 5 and 5 'cylinders circular, for example from 0.2 to 5 mm. One piece 8 cylindrical defines inside the main body two Helmholtz rooms 9 and 10. This part 8 forming a partition is a cylindrical part whose generating curve in the plane of the figure, which is a plane parallel to the direction of fluids, consists of a first line segment 11 substantially parallel to the axis flow, of a second line segment 12 intermediate, which defines the partition, and a third line segment 13 at a greater distance from the axis than the first straight line 11. Chamber 9, in the plane of the figure, is delimited by the wall of the main body, by the partition 12 and by the line segment 11. This chamber 9, torus-shaped defined at a distance from the flow axis equal to the diameter of fittings and conduits, communicates with the virtual cylinder defined by the two conduits 1 and 2 via an annular slot 14.

En outre, la chambre 10 est délimitée, d'une part par la paroi du corps extérieur, et d'autre part par la cloison 12 et par la partie de la paroi du conduit 2 qui fait saillie à l'intérieur du corps creux. Cette chambre 10 communique avec l'intérieur du cylindre virtuel par l'intermédiaire d'une fente annulaire 15. La longueur du segment 13 de droite est sensiblement égale à la largeur dans ce plan du cylindre 6. Ce cylindre 6 est soudé au cylindre 13 par soudure ou brasure.In addition, the chamber 10 is delimited, on the one hand by the wall of the external body, and on the other hand by the partition 12 and by the part of the wall of the duct 2 which protrudes inside the hollow body. This room 10 communicates with the interior of the virtual cylinder by through an annular slot 15. The length of the segment 13 on the right is substantially equal to the width in this plane of cylinder 6. This cylinder 6 is welded to the cylinder 13 by welding or brazing.

Le coin formé entre les deux segments 12 et 13 vient sensiblement buter contre une des parois latérales du renfoncement 6, ce qui permet de positionner avec précision la pièce 8 par rapport au corps creux. Le fait que les deux largeurs des cylindres 6 et 13 soient sensiblement égales assurent encore plus que le positionnement de la pièce 8 par rapport au corps creux lorsqu'elle est soudée au niveau du cylindre 6 est toujours la même. Les raccords 4 et 4' ont des diamètres légèrement supérieurs aux diamètres des conduits 1 et 2 et sont soudés à ceux-ci après avoir été enfilés dans les conduits.The corner formed between the two segments 12 and 13 substantially abuts against one of the side walls of the recess 6, which allows positioning with precision the part 8 relative to the hollow body. The fact that both widths of cylinders 6 and 13 are substantially equal ensure even more than the positioning of the part 8 by relative to the hollow body when welded at the cylinder 6 is always the same. Connections 4 and 4 'have diameters slightly larger than the diameters of conduits 1 and 2 and are welded to them after being threaded through the conduits.

Le silencieux (le corps creux et la pièce formant cloison) est en acier inox d'épaisseur 0,6 ou 0,8 mm. The silencer (the hollow body and the part forming partition) is made of stainless steel 0.6 or 0.8 mm thick.

Le corps creux est constitué de deux moitiés, qui sont sous la forme de deux cloches. Chaque cloche comporte un premier petit cylindre circulaire et un deuxième cylindre circulaire de plus grand diamètre et un troisième cylindre circulaire de diamètre légèrement plus grand que le deuxième. Le troisième cylindre circulaire de plus grand diamètre peut être formé par rapport au deuxième cylindre par emboutissage. Les deux moitiés sont réunies au niveau de leur bord extérieur au niveau du joint de soudure, les troisièmes cylindres des deux cloches forment, après avoir été soudés l'un à l'autre au niveau de leur bord 22 extérieur, le cylindre 6 de positionnement.The hollow body consists of two halves, which are in the form of two bells. Each bell has a first small circular cylinder and a second cylinder larger diameter circular and a third cylinder circular slightly larger in diameter than the second. The third largest circular cylinder diameter can be formed relative to the second cylinder by stamping. The two halves are joined at the level of their outer edge at the weld joint, the third cylinders of the two bells form, after having have been welded to each other at their edge 22 outside, the positioning cylinder 6.

Le positionnement des deux demi cloches par rapport aux conduits 1 et 2 est réalisé par l'intermédiaire de reliefs 20, 21 (représentés uniquement à la figure 1 mais pouvant également être prévus à la figure 2) répartis sur le pourtour de chaque conduit 1 et 2, par exemple trois reliefs à 120° les uns des autres, au niveau desquels viennent buter les bords extérieurs des raccords 4 et 4' et qui définissent ainsi le positionnement précis de ces deux raccords par rapport aux deux conduits dans lesquels ils s'insèrent avant d'y être soudés. Ceci permet d'obtenir un dimensionnement précis du corps de silencieux par rapport aux conduits 1 et 2 et donc une valeur précise de la largeur des fentes de communication entre les chambres toriques et le cylindre virtuel.The positioning of the two half bells by with respect to conduits 1 and 2 is carried out via reliefs 20, 21 (shown only in Figure 1 but can also be provided in Figure 2) distributed over the periphery of each duct 1 and 2, for example three reliefs at 120 ° from each other, where they come up against the outer edges of fittings 4 and 4 'which define thus the precise positioning of these two fittings by compared to the two conduits in which they are inserted before to be welded to it. This allows to obtain a dimensioning accuracy of the silencer body with respect to conduits 1 and 2 and therefore a precise value of the width of the slots of communication between the toric chambers and the cylinder virtual.

La figure 2 représente un autre mode de réalisation en variante d'un dispositif suivant l'invention. Les parties identiques à celles de la figure 1 y sont désignées par les mêmes références numériques.Figure 2 shows another mode of variant embodiment of a device according to the invention. The identical parts to those of figure 1 are there designated by the same reference numerals.

Ce mode de réalisation diffère du premier d'une part par la présence d'une deuxième pièce 8' formant cloison de forme identique à la première pièce 8 formant cloison et d'autre part, par la présence d'une troisième chambre torique 30. Cette troisième chambre 30 torique est en communication avec l'intérieur du conduit 2 de sortie uniquement par une fenêtre 31 rectangulaire s'étendant sur 120° du pourtour du conduit 2 de sortie. Cette conception confère à la chambre 30 une fréquence de résonnance relativement basse, comparée aux fréquences des chambres 9' et 10', permettant d'élargir la bande fréquentielle sur laquelle agit le silencieux.This embodiment differs from the first one part by the presence of a second part 8 'forming partition of identical shape to the first part 8 forming partition and on the other hand, by the presence of a third toric chamber 30. This third toric chamber 30 is in communication with the interior of the outlet duct 2 only by a rectangular window 31 extending over 120 ° from the periphery of the outlet duct 2. This conception gives room 30 a resonant frequency relatively low, compared to the frequencies of the 9 'chambers and 10 ', allowing the frequency band to be widened over which acts the muffler.

En fait, cette chambre 30 ne fonctionne pas selon le principe d'un résonateur de Helmholtz mais selon le principe d'un tube ouvert aux deux bouts, qui se rejoignent au même point de connexion.In fact, this room 30 does not work according to the principle of a Helmholtz resonator but according to the principle of an open tube at both ends, which meet at the same connection point.

La pièce 8', par l'intermédiaire de son segment 11', est à faible distance du conduit 2. Cependant, on peut les souder ensemble ou ne pas le faire, comme cela est représenté à la figure. Un léger jeu entre les deux n'est en effet pas préjudiciable à l'acoustique. Les segments 13 et 13' des deux pièces 8 et 8' formant cloison sont de mêmes dimensions, à savoir la moitié de la largeur du renfoncement annulaire 6.Room 8 ', via its segment 11 ', is a short distance from conduit 2. However, one can weld them together or not do it, as it is shown in figure. A slight play between the two is not effect not detrimental to acoustics. Segments 13 and 13 'of the two parts 8 and 8' forming a partition are the same dimensions, i.e. half the width of the recess ring finger 6.

Une extrémité de chacun des segments 13 et 13' (à savoir les extrémités formant avec les segments 12 et 12' un coin) vient en butée contre une butée respective formée par les parois latérales du renfoncement 6. Ainsi, les deux pièces 8 et 8', par ce positionnement coin contre butée, peuvent être positionnées avec précision. Le fait que la somme des longueurs de deux segments 13 et 13' soit sensiblement égale à la largeur du renfoncement améliore encore plus la précision du positionnement.One end of each of the segments 13 and 13 '(at know the ends forming with segments 12 and 12 'a corner) abuts against a respective stop formed by the side walls of the recess 6. Thus, the two parts 8 and 8 ', by this positioning wedge against stop, can be precisely positioned. The fact that the sum of the lengths of two segments 13 and 13 'or substantially equal to the width of the recess improves even more positioning accuracy.

Les silencieux représentés aux figures 1 et 2 ne sont pas symétriques. Suivant un autre mode de réalisation possible, ils pourraient l'être. En outre, dans le cas des modes de réalisation non symétriques, ils peuvent être utilisés avec un écoulement de l'air dans un sens ou dans l'autre.The silencers shown in Figures 1 and 2 do not are not symmetrical. According to another embodiment possible they could be. In addition, in the case of non-symmetrical embodiments they can be used with one-way or one-way air flow the other.

Claims (9)

Dispositif formant silencieux, destiné à être monté entre un premier conduit (1) d'entrée d'air ou de fluide et un deuxième conduit (2) de sortie d'air ou de fluide, ce dispositif étant notamment monté entre une turbine de moteur et un échangeur thermique ; le silencieux étant constitué d'un corps (3) principal creux cylindrique, d'un raccord (4) d'entrée et d'un raccord (4') de sortie cylindrique ayant une ou des sections droites inférieures à celle du corps (3) principal et d'au moins une pièce (8) formant cloison définissant avec la surface intérieure du corps principal creux au moins deux chambres (9, 10) toriques dans la région du corps principal qui se trouve autour du cylindre virtuel défini par le prolongement virtuel des deux raccords (4, 4') l'un vers l'autre, les chambres toriques étant chacune en communication directe avec ce cylindre virtuel suivant une fente (14, 15) s'étendant sur tout le pourtour du cylindre virtuel, caractérisé en ce que les chambres toriques sont séparées en partie du cylindre virtuel par la pièce formant cloison et/ou l'un et/ou les deux conduits entre lesquels est monté le silencieux.Muffler device, intended to be mounted between a first air or fluid inlet duct (1) and a second air or fluid outlet duct (2), this device being in particular mounted between an engine turbine and a heat exchanger; the silencer consisting of a main hollow cylindrical body (3), an inlet fitting (4) and a cylindrical outlet fitting (4 ') having one or more cross sections smaller than that of the body (3 ) main and at least one part (8) forming a partition defining with the inner surface of the hollow main body at least two toric chambers (9, 10) in the region of the main body which is around the virtual cylinder defined by the extension virtual of the two connections (4, 4 ') towards each other, the toric chambers each being in direct communication with this virtual cylinder according to a slot (14, 15) extending over the entire periphery of the virtual cylinder, characterized in that the toric chambers are separated in part from the virtual cylinder by the partition-forming part and / or one and / or the two conduits between which the silencer is mounted. Dispositif suivant la revendication 1, caractérisé en ce que le corps creux et les raccords sont des cylindres circulaires.Device according to claim 1, characterized in that the hollow body and the connections are circular cylinders. Dispositif suivant la revendication 1 ou 2, caractérisé en ce que la pièce (8) formant cloison est une pièce cylindrique, notamment circulaire, dont la courbe génératrice dans le plan parallèle au sens de l'écoulement du fluide comporte un premier segment (11) de droite définissant une paroi de séparation entre les chambres toriques et le cylindre virtuel, un deuxième segment (12) de droite définissant une séparation entre les deux chambres toriques, et un troisième segment (13) de droite, et il est formé dans la surface intérieure du corps creux un renfoncement (6) annulaire, le coin formé entre les deux segments (12) et (13) venant buter contre une des parois latérales du renfoncement (6). Device according to claim 1 or 2, characterized in that the part (8) forming a partition is a cylindrical part, in particular circular, whose generating curve in the plane parallel to the direction of flow of the fluid comprises a first segment (11) on the right defining a partition wall between the toric chambers and the virtual cylinder, a second segment (12) on the right defining a separation between the two toric chambers, and a third segment (13) on the right, and it is formed in the surface inside the hollow body an annular recess (6), the corner formed between the two segments (12) and (13) abutting against one of the side walls of the recess (6). Dispositif suivant la revendication 3, caractérisé en ce que La dimension en largeur du renfoncement (6) est sensiblement égale à la dimension du troisième segment (13) de droite de la pièce formant cloison.Device according to claim 3, characterized in that the width dimension of the recess (6) is substantially equal to the dimension of the third segment (13) on the right of the part forming a partition. Dispositif suivant l'une des revendications 1 à 4, caractérisé en ce que le corps principal creux est constitué de deux cloches identiques pouvant se raccorder l'une à l'autre au niveau de leur bord (22) extérieur.Device according to one of claims 1 to 4, characterized in that the hollow main body consists of two identical bells which can be connected to each other at their outer edge (22). Dispositif suivant la revendication 5, caractérisé en ce que les cloches sont constituées d'un cylindre dont la courbe génératrice dans le plan de l'axe du cylindre, à savoir l'axe d'écoulement des fluides, est constitué d'un premier segment de droite sensiblement parallèle à l'axe d'écoulement et correspondant à un diamètre sensiblement égal au diamètre des conduits d'entrée ou de sortie, un deuxième segment de droite sensiblement parallèle au premier segment de droite mais à plus grande distance de l'axe du cylindre et d'un troisième segment de droite à distance encore plus grande de l'axe du cylindre pour ainsi définir un renfoncement en coopération avec le troisième segmentde l'autre cloche.Device according to Claim 5, characterized in that the bells consist of a cylinder, the generating curve of which in the plane of the axis of the cylinder, namely the axis of flow of the fluids, consists of a first segment line substantially parallel to the flow axis and corresponding to a diameter substantially equal to the diameter of the inlet or outlet conduits, a second line segment substantially parallel to the first line segment but at greater distance from the axis of the cylinder and of a third line segment at an even greater distance from the axis of the cylinder so as to define a recess in cooperation with the third segment of the other bell. Dispositif suivant l'une des revendications précédentes, caractérisé par des moyens de positionnement des raccords (4, 4') par rapport aux conduits (1, 2), notamment sous la forme de reliefs (20, 21) répartis sur le pourtour des conduits à un niveau où l'on souhaite que viennent en butée contre ces reliefs les bords extérieurs respectifs de raccords.Device according to one of the preceding claims, characterized by means for positioning the connections (4, 4 ') relative to the conduits (1, 2), in particular in the form of reliefs (20, 21) distributed around the circumference of the conduits at a level where it is desired that the respective outer edges of fittings come into abutment against these reliefs. Dispositif suivant l'une des revendications précédentes, caractérisé en ce qu'il est formé au moins une chambre (30) torique auxiliaire communiquant avec l'intérieur du cylindre virtuel par l'intermédiaire d'une ouverture s'étendant sur moins de 360°, notamment de moins de 240°, de préférence moins de 120°.Device according to one of the preceding claims, characterized in that there is formed at least one auxiliary toric chamber (30) communicating with the interior of the virtual cylinder by means of an opening extending over less than 360 ° , especially less than 240 °, preferably less than 120 °. Dispositif suivant la revendication 8, caractérisé en ce que la troisième chambre (30) est formée par ajout d'une deuxième cloison (8') interne de même forme que la première cloison (8).Device according to claim 8, characterized in that the third chamber (30) is formed by adding a second internal partition (8 ') of the same shape as the first partition (8).
EP01402977A 2000-11-23 2001-11-21 Silencing device, particularly for turbocharged engine Revoked EP1209348B1 (en)

Applications Claiming Priority (2)

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FR0015100A FR2816991B1 (en) 2000-11-23 2000-11-23 SILENT FORMING DEVICE, ESPECIALLY FOR A TURBO ENGINE
FR0015100 2000-11-23

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EP1209348B1 EP1209348B1 (en) 2006-06-14

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EP (1) EP1209348B1 (en)
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DE60120611T2 (en) 2007-06-06
US20020070075A1 (en) 2002-06-13
US6681888B2 (en) 2004-01-27
JP4137433B2 (en) 2008-08-20
FR2816991A1 (en) 2002-05-24
FR2816991B1 (en) 2003-01-17
KR20020040617A (en) 2002-05-30
DE60120611D1 (en) 2006-07-27
JP2002195006A (en) 2002-07-10
EP1209348B1 (en) 2006-06-14

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