EP1209348B1 - Silencing device, particularly for turbocharged engine - Google Patents

Silencing device, particularly for turbocharged engine Download PDF

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Publication number
EP1209348B1
EP1209348B1 EP01402977A EP01402977A EP1209348B1 EP 1209348 B1 EP1209348 B1 EP 1209348B1 EP 01402977 A EP01402977 A EP 01402977A EP 01402977 A EP01402977 A EP 01402977A EP 1209348 B1 EP1209348 B1 EP 1209348B1
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EP
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Prior art keywords
cylinder
straight segment
main body
axis
toric
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EP01402977A
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German (de)
French (fr)
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EP1209348A1 (en
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Henri Lepoutre
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WEVISTA
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WEVISTA
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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 silencer device to be mounted between a combustion air supply duct exiting for example a motor turbine and an outlet duct through which the air or the combustion fluid leaves in the direction, for example a heat exchanger.
  • Silencers of this type are already known in the prior art.
  • these silencer devices comprise a hollow main body of cylindro-circular shape; a cylindro-circular inlet and outlet fitting each having a diameter smaller than the diameter of the main body and mounted on either side of the main body, at least one partition piece defining with the inner surface of the hollow main body at least two O-chambers in the interior space of the main body defined, in cross-section, between the diameter of the body and the diameter of the connectors, the O-chambers being in direct communication with the virtual cylinder, which is defined by the diameter of the connectors and in which the fluid passes from one connector to the other, via a circular slot extending around the entire periphery of this virtual cylinder.
  • the positioning of the partition part is very important.
  • the width of the toric chambers must be a precise function of the frequency of the sound waves that it is desired to dampen. Therefore, it is necessary to very precisely position the partition piece. It takes a lot of time, which in a large manufacturing perspective scale poses problem.
  • the manufacture itself of the hollow main body is complicated to achieve.
  • the present invention aims to overcome these disadvantages by proposing a new silencer device mounted between an air inlet duct and an air outlet duct or fluid which is easy to manufacture, and in particular does not require many tools stamping and which at the same time also limits the pressure losses inside the silencer.
  • the silencer device intended to be mounted between a first air or fluid inlet duct and a second air or fluid outlet duct, this device being in particular mounted between an engine turbine and a heat exchanger;
  • the silencer consisting of a cylindrical hollow main body, an inlet fitting and a cylindrical outlet fitting of cross-section less than the cross-section of the main body and at least one partition piece defining with the inner surface of the main body hollow at least two toric chambers in the region of the main body which 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 following a slot extending all around the virtual cylinder, is characterized in that the toric chambers are partly separated from the virtual cylinder by the partition piece and / or one and / or both ducts between which is mounted the muffler.
  • the partition part (s) is (are) a cylindrical part (s) whose generating curve in the plane parallel to the direction of the flow of the fluid comprises a first segment. on the right defining a partition wall between the toric chambers and the virtual cylinder, a second straight segment defining a separation between two toric chambers, and a third straight segment forming a wedge with the second segment, and formed in the surface inside the hollow body an annular recess, the wedge abutting against a side wall of the recess, so that when this third segment is welded into this recess, a precise positioning of the partition piece is obtained in a simple manner, and therefore a precise dimension of the resonance chambers with the possibility of producing on a large scale without always having to accurately measure the e positioning of the partition.
  • the width dimension of the recess is substantially equal to the dimension of the third segment of the right of the partition piece. This further improves the positioning accuracy.
  • the hollow main body consists of two identical bells that can be connected to one another at their outer edge.
  • the bells consist of a cylinder whose generating curve in the plane of the axis of the cylinder, namely the flow axis of the fluids, consists of a first segment of the right 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 line segment even further distance from the axis of the cylinder to thereby define a recess in cooperation with the third segment of the other bell.
  • At least one third auxiliary toric chamber is formed which communicates with the inside of the virtual cylinder via an opening extending over less than 360 °, in particular less than 240 °, from preferably less than 120 °.
  • the third chamber is formed by adding a second internal partition of the same shape as the first partition.
  • FIG. 1 represents a first embodiment of a device according to the invention.
  • FIG. 2 represents another embodiment of a device according to the invention.
  • FIG. 1 there is described a muffler mounted between an air inlet duct 1, which is connected on the other hand to the turbine of a motor (not shown), and an outlet duct 2 leading directly or indirectly through other conduits to a heat exchanger.
  • the air flows between the duct 1 and the duct 2.
  • the device can also be used with a flow of air in the other direction, the duct 2 becoming the inlet duct and the duct 1 the outlet duct .
  • This silencer to remove or reduce noise generated by the turbine of the turbo engine.
  • the silencer consists of a hollow main body 3 of cylindro-circular shape.
  • This cylindro-circular main body consists of a first circular cylinder 4 forming the inlet connection, a second circular cylinder 4 'forming the outlet connection, a third circular cylinder 5, a fourth cylinder 5 circular and a circular fifth cylinder 6, the cylinders 5, 5 'and 6 circular defining the inner region of the silencer.
  • the diameter of the circular cylinder 6 is a little larger than the diameter of the cylinders 5 and 5 'circular, for example 0.2 to 5 mm.
  • One piece 8 cylindrical defines inside the main body two chambers 9 and 10 of Helmholtz.
  • This part 8 forming a partition is a cylindrical piece whose generating curve in the plane of the figure, which is a plane parallel to the flow direction of the fluids, consists of a first segment of line 11 substantially parallel to the axis flow, a second segment of line 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.
  • the 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 outer body, and on the other hand by the partition 12 and the portion of the wall of the conduit 2 which protrudes inside the hollow body.
  • This chamber 10 communicates with the inside of the virtual cylinder through an annular slot 15.
  • the length of the segment 13 of the right is substantially equal to the width in this plane of the cylinder 6.
  • This cylinder 6 is welded to the cylinder 13 by welding or brazing.
  • the wedge formed between the two segments 12 and 13 is substantially abutted against one of the side walls of the recess 6, which allows to accurately position the part 8 relative to the hollow body.
  • the fact that the two widths of the cylinders 6 and 13 are substantially equal ensures even more that the positioning of the part 8 relative to the hollow body when it is welded at the cylinder 6 is always the same.
  • the connectors 4 and 4 ' have diameters slightly greater than the diameters of the ducts 1 and 2 and are welded thereto after being threaded into the ducts.
  • the silencer (the hollow body and the partition piece) is made of 0.6 or 0.8 mm thick stainless steel.
  • 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 circular cylinder of larger diameter and a third circular cylinder of diameter slightly larger than the second.
  • the third circular cylinder of larger diameter may be formed relative to the second cylinder by stamping.
  • the two halves are joined at their outer edge at the weld joint, the third cylinders of the two bells form, after having been welded to one another at their outer edge 22, the positioning cylinder 6 .
  • the positioning of the two half-bells with respect to the ducts 1 and 2 is achieved by means of reliefs 20, 21 (shown only in FIG. 1 but which can also be provided in FIG. 2) distributed around the perimeter of each duct 1 and 2, for example three reliefs at 120 ° from each other, at which abut the outer edges of the connectors 4 and 4 'and which thus define the precise positioning of these two connections relative to the two ducts in which they fit before being soldered.
  • This makes it possible to obtain a precise dimensioning of the silencer body with respect to the ducts 1 and 2 and therefore a precise value of the width of the communication slots between the toric chambers and the virtual cylinder.
  • Figure 2 shows another alternative embodiment of a device according to the invention. Parts identical to those of Figure 1 are designated by the same reference numerals.
  • This embodiment differs from the first on the one hand by the presence of a second part 8 'forming a 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 toroidal chamber is in communication with the interior of the outlet conduit 2 only through a rectangular window 31 extending 120 ° from the periphery of the outlet conduit 2.
  • This design gives the chamber 30 a resonance frequency relatively low, compared to the frequencies of the chambers 9 'and 10', to expand the frequency band on which the silencer acts.
  • this chamber 30 does not operate 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 point of connection.
  • the part 8 ', through its segment 11', is at a small distance from the duct 2. However, they can be welded together or not, as shown in the figure. A slight game between the two is not detrimental to the acoustics.
  • the segments 13 and 13 'of the two parts 8 and 8' forming a partition are of the same dimensions, namely half the width of the annular recess 6.
  • each of the segments 13 and 13 ' (ie the ends forming with the segments 12 and 12' a wedge) abuts against a respective stop formed by the side walls of the recess 6.
  • the two pieces 8 and 8 ' by this positioning wedge against stop, can be positioned with precision.
  • the fact that the sum of the lengths of two segments 13 and 13 'is substantially equal to the width of the recess further improves the positioning accuracy.
  • the silencers shown in Figures 1 and 2 are not symmetrical. According to another possible embodiment, they could be. In addition, in the case of non-symmetrical embodiments, they can be used with air flow in one direction or 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)

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 silencer device to be mounted between a combustion air supply duct exiting for example a motor turbine and an outlet duct through which the air or the combustion fluid leaves in the direction, for example a heat exchanger.

On connaît 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.Silencers of this type are already known in the prior art. In the prior art, these silencer devices comprise a hollow main body of cylindro-circular shape; a cylindro-circular inlet and outlet fitting each having a diameter smaller than the diameter of the main body and mounted on either side of the main body, at least one partition piece defining with the inner surface of the hollow main body at least two O-chambers in the interior space of the main body defined, in cross-section, between the diameter of the body and the diameter of the connectors, the O-chambers being in direct communication with the virtual cylinder, which is defined by the diameter of the connectors and in which the fluid passes from one connector to the other, via a circular slot extending around the entire periphery of this virtual cylinder.

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 have several disadvantages. On the one hand, the circular slots extending around the entire circumference of the virtual cylinder are, for reasons of ease of manufacture, too large. As a result, during the flow of air in the virtual cylinder between the inlet connection and the outlet connection, significant pressure drops of the fluid passing through 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 silencer, the positioning of the partition part is very important. Indeed, the width of the toric chambers must be a precise function of the frequency of the sound waves that it is desired to dampen. Therefore, it is necessary to very precisely position the partition piece. It takes a lot of time, which in a large manufacturing perspective scale poses problem. Finally, the manufacture itself of the hollow main body is complicated to achieve.

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 silencer device mounted between an air inlet duct and an air outlet duct or fluid which is easy to manufacture, and in particular does not require many tools stamping and which at the same time also limits the pressure losses inside the silencer.

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 silencer device, intended to be mounted between a first air or fluid inlet duct and a second air or fluid outlet duct, this device being in particular mounted between an engine turbine and a heat exchanger; the silencer consisting of a cylindrical hollow main body, an inlet fitting and a cylindrical outlet fitting of cross-section less than the cross-section of the main body and at least one partition piece defining with the inner surface of the main body hollow at least two toric chambers in the region of the main body which 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 following a slot extending all around the virtual cylinder, is characterized in that the toric chambers are partly separated from the virtual cylinder by the partition piece and / or one and / or both ducts between which is mounted the muffler.

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.By thus using the outer walls of the two inlet and outlet ducts and an auxiliary wall coming from the partition piece separating the two body-shaped chambers, it is ensured that the dimension along the direction of the flow of the communication slot between these chambers and the main flow of fluid remains small and thus reduces the pressure losses, and in a simple manner without requiring in particular additional tools 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 partition part (s) is (are) a cylindrical part (s) whose generating curve in the plane parallel to the direction of the flow of the fluid comprises a first segment. on the right defining a partition wall between the toric chambers and the virtual cylinder, a second straight segment defining a separation between two toric chambers, and a third straight segment forming a wedge with the second segment, and formed in the surface inside the hollow body an annular recess, the wedge abutting against a side wall of the recess, so that when this third segment is welded into this recess, a precise positioning of the partition piece is obtained in a simple manner, and therefore a precise dimension of the resonance chambers with the possibility of producing on a large scale without always having to accurately measure the e 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 segment of the right of the partition piece. This further improves the positioning accuracy.

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 hollow main body consists of two identical bells that can be connected to one another at 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 generating curve in the plane of the axis of the cylinder, namely the flow axis of the fluids, consists of a first segment of the right 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 line segment even further distance from the axis of the cylinder to thereby 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, at least one third auxiliary toric chamber is formed which communicates with the inside of the virtual cylinder via an opening extending over less than 360 °, in particular less than 240 °, from 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 chamber is formed by adding a second internal partition of 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 solely 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 ; etFIG. 1 represents a first embodiment of a device according to the invention; and

La figure 2 représente un autre mode de réalisation d'un dispositif suivant l'invention.FIG. 2 represents another embodiment 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 FIG. 1, there is described a muffler mounted between an air inlet duct 1, which is connected on the other hand to the turbine of a motor (not shown), and an outlet duct 2 leading directly or indirectly through other conduits to a heat exchanger. The air flows between the duct 1 and the duct 2. The device can also be used with a flow of air in the other direction, the duct 2 becoming the inlet duct and the duct 1 the outlet duct . It is desired to use this silencer to remove or reduce noise generated by the turbine of the turbo engine. To do this, we use the well-known Helmholtz resonator technique. The silencer consists of a hollow main body 3 of cylindro-circular shape. This cylindro-circular main body consists of a first circular cylinder 4 forming the inlet connection, a second circular cylinder 4 'forming the outlet connection, a third circular cylinder 5, a fourth cylinder 5 circular and a circular fifth cylinder 6, the cylinders 5, 5 'and 6 circular defining the inner region of the silencer. The diameter of the circular cylinder 6 is a little larger than the diameter of the cylinders 5 and 5 'circular, for example 0.2 to 5 mm. One piece 8 cylindrical defines inside the main body two chambers 9 and 10 of Helmholtz. This part 8 forming a partition is a cylindrical piece whose generating curve in the plane of the figure, which is a plane parallel to the flow direction of the fluids, consists of a first segment of line 11 substantially parallel to the axis flow, a second segment of line 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. The 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 axis of flow equal to the diameter of the connections and the ducts, communicates with the virtual cylinder defined by the two ducts 1 and 2 by means of 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 outer body, and on the other hand by the partition 12 and the portion of the wall of the conduit 2 which protrudes inside the hollow body. This chamber 10 communicates with the inside of the virtual cylinder through an annular slot 15. The length of the segment 13 of the right is substantially equal to the width in this plane of the 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 wedge formed between the two segments 12 and 13 is substantially abutted against one of the side walls of the recess 6, which allows to accurately position the part 8 relative to the hollow body. The fact that the two widths of the cylinders 6 and 13 are substantially equal ensures even more that the positioning of the part 8 relative to the hollow body when it is welded at the cylinder 6 is always the same. The connectors 4 and 4 'have diameters slightly greater than the diameters of the ducts 1 and 2 and are welded thereto after being threaded into the ducts.

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 partition piece) is made of 0.6 or 0.8 mm thick stainless steel.

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 circular cylinder of larger diameter and a third circular cylinder of diameter slightly larger than the second. The third circular cylinder of larger diameter may be formed relative to the second cylinder by stamping. The two halves are joined at their outer edge at the weld joint, the third cylinders of the two bells form, after having been welded to one another at their outer edge 22, 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 with respect to the ducts 1 and 2 is achieved by means of reliefs 20, 21 (shown only in FIG. 1 but which can also be provided in FIG. 2) distributed around the perimeter of each duct 1 and 2, for example three reliefs at 120 ° from each other, at which abut the outer edges of the connectors 4 and 4 'and which thus define the precise positioning of these two connections relative to the two ducts in which they fit before being soldered. This makes it possible to obtain a precise dimensioning of the silencer body with respect to the ducts 1 and 2 and therefore a precise value of the width of the communication slots between the toric chambers and the virtual cylinder.

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 alternative embodiment of a device according to the invention. Parts identical to those of Figure 1 are 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 on the one hand by the presence of a second part 8 'forming a 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 toroidal chamber is in communication with the interior of the outlet conduit 2 only through a rectangular window 31 extending 120 ° from the periphery of the outlet conduit 2. This design gives the chamber 30 a resonance frequency relatively low, compared to the frequencies of the chambers 9 'and 10', to expand the frequency band on which the silencer acts.

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 chamber 30 does not operate 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 point of connection.

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.The part 8 ', through its segment 11', is at a small distance from the duct 2. However, they can be welded together or not, as shown in the figure. A slight game between the two is not detrimental to the acoustics. The segments 13 and 13 'of the two parts 8 and 8' forming a partition are of the same dimensions, namely half the width of the annular recess 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 '(ie the ends forming with the segments 12 and 12' a wedge) abuts against a respective stop formed by the side walls of the recess 6. Thus, the two pieces 8 and 8 ', by this positioning wedge against stop, can be positioned with precision. The fact that the sum of the lengths of two segments 13 and 13 'is substantially equal to the width of the recess further improves the 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 are not symmetrical. According to another possible embodiment, they could be. In addition, in the case of non-symmetrical embodiments, they can be used with air flow in one direction or the other.

Claims (9)

  1. Silencer system with a first air or fluid inlet pipe (1) and a second air or fluid outlet pipe (2), this system notably being intended for mounting between an engine turbine and a heat exchanger. The silencer consists of a hollow cylindrical main body (3), a cylindrical inlet connection (4) and outlet connection (4') with one or more straight sections below that of the main body (3) and of at least one partitioning part (8) defining, together with the internal surface of the main hollow body, at least two toric chambers (9, 10) in the area of the main body located around the virtual cylinder defined by the virtual extension of the two connections (4, 4') facing each other, the toric chambers each communicating directly with this virtual cylinder following a slot (14, 15) extending over the entire perimeter of the virtual cylinder, whereby the toric chambers are partly separated from the virtual cylinder by the partitioning part and/or one of the two pipes (1, 2) or the two pipes between which the silencer is mounted.
  2. System according to claim 1, whereby the hollow body and the connections are circular cylinders.
  3. System according to claim 1 or 2, whereby the partitioning part (8) is a cylindrical, notably circular part, the generating curve of which in the plane parallel to the direction of the fluid's flow comprises a first straight segment (11) defining a separating wall between the toric chambers and the virtual cylinder, a second straight segment (12) defining a separation between the two toric chambers, a third straight segment (13) and an annular reinforcement (6) is formed in the internal surface of the hollow body, the corner formed between the two segments (12) and (13) supporting one of the side walls of the reinforcement (6).
  4. System according to claim 3, whereby the width of the reinforcement (6) is roughly equal to the size of the third straight segment (13) of the partitioning part.
  5. System according to one of claims 1 to 4, whereby the hollow main body consists of two identical hoods that can be connected to one another on their outer edge (22).
  6. System according to claim 5, whereby the hoods consist of a cylinder, the generating curve of which in the plane of the cylinder's axis, i.e. the axis of the fluid flow, consists of a first straight segment roughly parallel to the axis of flow and corresponding to a diameter roughly equal to the diameter of the inlet and outlet pipes, a second straight segment roughly parallel to the first straight segment but at a greater distance from the axis of the cylinder and of a third straight segment at an even greater distance from the axis of the cylinder, thus defining a reinforcement working together with the third segment of the other hood.
  7. System according to one of the previous claims, whereby methods of positioning connections (4, 4') in relation to the pipes (1, 2), notably in the form of reliefs (20, 21) spread over the perimeter of the pipes where the respective outer edges of connections are required to support these reliefs.
  8. System according to one of the previous claims, whereby at least one auxiliary toric chamber (30) communicating with the inside of the virtual cylinder is formed by an aperture extending over less than 360°, notably less than 240° and preferably less than 120°.
  9. System according to claim 8, whereby the third chamber (30) is formed by adding a second internal partition (8') in 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)

Application Number Priority Date Filing Date Title
FR0015100A FR2816991B1 (en) 2000-11-23 2000-11-23 SILENT FORMING DEVICE, ESPECIALLY FOR A TURBO ENGINE
FR0015100 2000-11-23

Publications (2)

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EP1209348A1 EP1209348A1 (en) 2002-05-29
EP1209348B1 true EP1209348B1 (en) 2006-06-14

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EP01402977A Revoked EP1209348B1 (en) 2000-11-23 2001-11-21 Silencing device, particularly for turbocharged engine

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US (1) US6681888B2 (en)
EP (1) EP1209348B1 (en)
JP (1) JP4137433B2 (en)
KR (1) KR20020040617A (en)
DE (1) DE60120611T2 (en)
FR (1) FR2816991B1 (en)

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DE102005036676A1 (en) * 2005-08-04 2007-02-15 Faurecia Abgastechnik Gmbh Silencer for the exhaust system of a motor vehicle
JP4771546B2 (en) * 2007-03-22 2011-09-14 株式会社Ｒｏｋｉ Silencer duct
FR2946120B1 (en) * 2009-05-29 2015-11-06 Hutchinson ACOUSTICAL ATTENUATION DEVICE FOR THE INTAKE LINE OF A THERMAL MOTOR, AND ADMISSION LINE INCORPORATING IT.
WO2011161042A1 (en) * 2010-06-22 2011-12-29 Bekaert Combustion Technology B.V. Fluegas slit cavity muffler
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FR2983919B1 (en) * 2011-12-13 2014-01-03 Hutchinson ACOUSTICAL ATTENUATION DEVICE FOR THE INTAKE LINE OF A THERMAL MOTOR, AND ADMISSION LINE INCORPORATING IT.
AT513955A1 (en) * 2013-01-16 2014-08-15 Henn Gmbh & Co Kg Silencer and process for its production
CN107110079B (en) * 2015-01-12 2020-03-03 亨恩有限及两合股份公司 Vehicle silencer
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Publication number Publication date
FR2816991A1 (en) 2002-05-24
US6681888B2 (en) 2004-01-27
FR2816991B1 (en) 2003-01-17
DE60120611D1 (en) 2006-07-27
US20020070075A1 (en) 2002-06-13
DE60120611T2 (en) 2007-06-06
JP2002195006A (en) 2002-07-10
JP4137433B2 (en) 2008-08-20
KR20020040617A (en) 2002-05-30
EP1209348A1 (en) 2002-05-29

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