EP1510668B1 - Silencieux et dispositif d'échappement - Google Patents

Silencieux et dispositif d'échappement Download PDF

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Publication number
EP1510668B1
EP1510668B1 EP04017953A EP04017953A EP1510668B1 EP 1510668 B1 EP1510668 B1 EP 1510668B1 EP 04017953 A EP04017953 A EP 04017953A EP 04017953 A EP04017953 A EP 04017953A EP 1510668 B1 EP1510668 B1 EP 1510668B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
flow
exhaust pipe
muffler
swirling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04017953A
Other languages
German (de)
English (en)
Other versions
EP1510668A1 (fr
EP1510668B8 (fr
Inventor
Rolf Dr. Jebasinski
Sascha Leng
Marco Jess
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP1510668A1 publication Critical patent/EP1510668A1/fr
Application granted granted Critical
Publication of EP1510668B1 publication Critical patent/EP1510668B1/fr
Publication of EP1510668B8 publication Critical patent/EP1510668B8/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures

Definitions

  • the invention relates to a silencer according to the preamble of claim 1 for an exhaust system of a motor vehicle. Furthermore, the invention relates to an exhaust system for a motor vehicle, with a silencer according to the invention.
  • the pressure pulses produced in the exhaust gas by the combustion process in the internal combustion engine lead in the exhaust gas flow flowing through the exhaust system to the formation of sound waves in different frequency ranges.
  • silencers in particular the audible for human hearing frequencies are to be damped.
  • the sound waves are transmitted from the exhaust system to the body or the chassis of the vehicle and stimulate them to vibrate.
  • the silencer as the actual silencer unit has at least one sound absorber, a sound reflector or a resonator.
  • the muffler unit of the muffler is connected via a plurality of openings, such as slots, holes, slots and the like, with the exhaust pipe in flow communication.
  • the sound waves of the pulsating exhaust gas flow are passed through the openings in the muffler unit, in which the sound waves are attenuated in a known manner by absorption or reflection.
  • the invention solves the problem by a silencer having the features of claim 1. Furthermore, the invention solves the problem by an exhaust system according to claim 13, which is equipped with a silencer according to the invention.
  • the forming flow profile of the exhaust gas flow is now specifically disturbed in the exhaust pipe at a distance in front of the opening edges.
  • the formation of such high-frequency tones is thus prevented in the inventive silencer, but at least significantly reduced.
  • the silencer in a particularly preferred embodiment of the silencer according to the invention, it is proposed to arrange a plurality of turbulence elements in succession in the flow direction of the exhaust gas stream. This ensures that the exhaust gas flow over a longer pipe section of the exhaust pipe is specifically disturbed in its flow profile, so that even with a distribution the openings which connect the exhaust pipe with the muffler unit, the generation of high-frequency tones is prevented over a relatively long pipe section.
  • the swirling elements according to the invention can in this case be arranged between the openings, without the damping behavior of the silencer being impaired overall.
  • the turbulence elements which are arranged in a common plane transverse to the flow direction of the exhaust gas flow, are provided uniformly spaced from each other on the inner surface of the exhaust gas pipe. In this way it is ensured that the boundary layers of the flow are swirled on the entire inner surface of the exhaust pipe.
  • the openings which connect the exhaust pipe with the silencer unit formed only on one side of the exhaust pipe for example in a laterally attached as a Helmholtz resonator tube, it is also sufficient if only in front of the provided with the openings réelleoberphasechenabites the exhaust pipe swirling elements are provided ,
  • a plurality of mutually arranged in a common plane transversely to the flow direction of the exhaust gas flow arranged Vermmdungsetti are combined into groups, while the individual groups of Verwirbelungsetti seen in the flow direction of the exhaust stream are arranged successively.
  • the individual groups of the swirling elements can be arranged offset from one another. However, they can also be arranged relative to one another in such a way that the turbulence elements of different groups overlap one another, that is to say each are arranged on a common line in the flow direction of the exhaust gas stream.
  • the distances between the successive groups of the swirling elements are kept constant, so that a uniform pattern of swirling elements is formed.
  • the silencer In order to ensure that the exhaust gas stream is swirled sufficiently for a predetermined length of the exhaust pipe at successively arranged Verwirbelungsalementen, it is further proposed in the silencer according to the invention that the distance between successively arranged turbulence in the flow direction of the exhaust stream is dimensioned so that the subsequently arranged turbulence in a section is arranged in the exhaust pipe, in which the turbulence caused by the immediately upstream turbulence element of the boundary layers of the exhaust gas flow to the inner surface of the exhaust pipe are still effective.
  • the Verwirbelungs institute In the integral formation of the Verwirbelungs institute with the exhaust pipe is proposed to form the Verwirbelungs institute by forming the exhaust pipe in which, for example, from the outside into the outer surface of the exhaust pipe a ProfiWarkmaschine is pressed, which leads to the formation of the Verwirbelungs elements on the inner surface of the exhaust pipe.
  • the height of the turbulators should be such that it is greater than the maximum possible thickness of resulting laminar boundary layers.
  • the height of each turbulence element in the radial direction viewed transversely to the flow direction of the exhaust gas flow, should be such that it corresponds to 1/5 to 1/15 of the diameter of the exhaust pipe.
  • Particularly good results could be achieved with swirl elements, which corresponded to 1/10 of the diameter of the exhaust pipe.
  • each turbulence element viewed transversely to the flow direction of the exhaust gas flow should again be dimensioned such that the turbulence element is an obstacle effective for the boundary layers of the exhaust gas flow, without the exhaust gas flow being appreciably affected overall.
  • the width corresponds to 1/2 to 1/8, preferably 1/3, of the diameter of the exhaust pipe, without the total exhaust gas flow is significantly affected.
  • the exhaust pipe is in flow connection with an absorption silencer, a reflection silencer or a resonator.
  • a plurality of muffler units of the same or different type may be in flow communication with the exhaust pipe, for example a reflection muffler and a resonator.
  • the invention relates to an exhaust system for a motor vehicle, which is equipped with a silencer according to the invention.
  • Fig. 1 is a schematic sectional view of an inventive muffler 10 is shown for an exhaust system in a motor vehicle.
  • the muffler 10 is connected in a conventional manner either via flanges to the piping of the exhaust system or already integrated directly into the exhaust system.
  • the muffler 10 has a muffler housing 12, which has a hollow cylindrical shape in the illustrated embodiment.
  • the muffler housing 12 is closed at its two open ends in each case by a cover 14 or 16.
  • a hollow-cylindrical exhaust pipe 18 which is guided through formed on the two covers 14 and 16 receiving openings 20 and 22 in the longitudinal direction of the muffler housing 12.
  • the exhaust pipe 18 is welded to the two covers 14 and 16 of the muffler housing 12.
  • a Helmholtz resonator 24 is arranged in the form of an L-shaped bent tube 26, which formed at the shorter end tube opening 28 is welded to the outer surface of the exhaust pipe 18.
  • a transverse to the longitudinal direction of the exhaust pipe 18 extending partition 30 is arranged in the muffler housing 12, which divides the muffler housing 12 into a reflection chamber 32, which serves as a reflection muffler unit 34 in the muffler 10 according to the invention.
  • Low-frequency sound waves conducted from the exhaust pipe 18 into the reflection chamber 32 are here damped in a known manner by reflection and interference.
  • a plurality of openings 36 and 38 are formed on the exhaust pipe 18.
  • the openings 36 are in flow connection with the pipe opening 28 of the pipe 22 fastened to the outer surface of the exhaust pipe 18.
  • the openings 38 connect the exhaust pipe 18 to the reflection chamber 32.
  • the exhaust gas flowing through the exhaust pipe 18 can communicate with the standing in Helmholtz resonator 20 gas column and with the volume of gas contained in the reflection chamber 32 for vibration transmission.
  • a plurality of swirling elements 40 are provided in a plane transverse to the flow direction R of the exhaust gas stream, and protrude radially inwards from the inner surface of the exhaust pipe 18.
  • the swirling elements 40 are formed only immediately in front of the Helmholtz resonator 24 in communication, side openings 36 on the exhaust pipe 18, but not sideways to these.
  • one of the swirling elements 40 is shown in an enlarged perspective view.
  • the swirling element 40 is formed as a knob and was formed from the outside by a molding tool inwardly into the tube interior of the exhaust pipe 18.
  • the swirling element 40 is designed and dimensioned such that it represents an obstacle for the boundary layer of the exhaust gas flow flowing along the inner surface of the exhaust pipe 18, through which the flow profile of the exhaust gas stream experiences a noticeable swirling and is specifically disturbed after passing through the swirling element 40, without thereby the total exhaust gas flow is significantly affected.
  • the swirling element 40 is dimensioned in its height h so that it corresponds to 1/10 of the diameter of the exhaust pipe 18, so that it is ensured that the swirling element 40 protrudes through the laminar boundary layer of the exhaust gas stream seen completely in the radial direction.
  • the width of the swirling element 40 corresponds to 1/3 of the diameter of the exhaust pipe 18, while its length I corresponds to about 1/6 of the diameter of the exhaust pipe 18.
  • the rear side facing away from the flowed surface of the swirling element 40 in the direction of flow R of the exhaust gas can furthermore be designed such that a tear-off edge for the flow is formed, which leads to additional turbulence in the boundary layer of the exhaust gas flow.
  • Corresponding swirling elements 40 are further formed in the pipe section of the exhaust pipe 18 which passes through the reflection chamber 32.
  • turbulators 40 are provided, which are arranged in a common plane transversely to the flow direction R of the exhaust gas arranged and combined in groups 42. 1, a total of five successively arranged in the flow direction R arranged groups 42 are provided, each spaced from each other in the exhaust pipe 18 and formed between which the openings 38 for connecting the exhaust pipe 18 to the reflection chamber 32. 4, in which a section along the section line IV-IV in Fig. 1 is shown, the Verwirbelungsieri 40 are each a group 42 uniformly distributed over the inner circumference of the exhaust pipe 18 formed in the embodiment shown in Fig.

Landscapes

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

Claims (13)

  1. Silencieux pour un dispositif d'échappement d'un véhicule automobile, comprenant un boîtier de silencieux (12) à travers lequel passe un tuyau d'échappement (18) pour le faire traverser par des courants de gaz d'échappement à rendre silencieux, et au moins un bloc silencieux (24, 34) qui est en liaison fluidique avec le tuyau d'échappement (18) par le biais d'ouvertures (36, 38), plusieurs éléments de tourbillonnement (40), disposés devant les ouvertures (36, 38) en regardant dans le sens de l'écoulement (R) du courant de gaz d'échappement, faisant saillie de la surface intérieure du tuyau d'échappement (18) vers l'intérieur, caractérisé en ce que les éléments de tourbillonnement (40) sont disposés à une certaine distance devant les bords d'ouverture des ouvertures (36, 38) et sont réalisés sous la forme de boutons estampés vers l'intérieur sur la surface extérieure du tuyau d'échappement (18).
  2. Silencieux selon la revendication 1, plusieurs éléments de tourbillonnement (40) étant disposés successivement en regardant dans le sens de l'écoulement (R) du courant de gaz d'échappement.
  3. Silencieux selon la revendication 1 ou 2, les éléments de tourbillonnement (40), lesquels sont disposés dans un plan commun transversalement au sens de l'écoulement (R) du courant de gaz d'échappement, étant prévus sur la surface intérieure du tuyau d'échappement (18) espacés régulièrement les uns des autres.
  4. Silencieux selon la revendication 1, 2 ou 3, plusieurs éléments de tourbillonnement (40) disposés dans un plan commun transversalement au sens de l'écoulement (R) du courant de gaz d'échappement étant à chaque fois rassemblés en un groupe (42) et les groupes (42) individuels d'éléments de tourbillonnement (40), vus dans le sens de l'écoulement (R) du courant de gaz d'échappement, étant disposés les uns après les autres, les écarts entre les groupes (42) d'éléments de tourbillonnement (40) successifs étant de préférence constants.
  5. Silencieux selon au moins l'une des revendications 1 à 4, l'écart entre des éléments de tourbillonnement (40) qui se suivent directement, vu dans le sens de l'écoulement (R) du courant de gaz d'échappement, étant choisi de telle sorte que l'élément de tourbillonnement (40) qui se trouve à la suite est disposé dans une section dans le tuyau d'échappement (18) dans laquelle les tourbillonnements des couches limites du courant de gaz d'échappement provoqués par l'élément de tourbillonnement (40) qui le précède immédiatement sont encore actifs sur la surface intérieure du tuyau d'échappement (18).
  6. Silencieux selon au moins l'une des revendications 1 à 5, un élément de tourbillonnement (40) étant disposé devant chaque ouverture.
  7. Silencieux selon au moins l'une des revendications précédentes, les éléments de tourbillonnement (40) étant formés d'une seule pièce avec le tuyau d'échappement (18).
  8. Silencieux selon au moins l'une des revendications précédentes, les éléments de tourbillonnement (40) étant formés par déformation sur la surface du tuyau d'échappement (18).
  9. Silencieux selon au moins l'une des revendications précédentes, la hauteur (h) de chaque élément de tourbillonnement (40) dans le sens radial, vue transversalement par rapport au sens de l'écoulement (R) du courant de gaz d'échappement, étant choisie de telle sorte qu'elle correspond à 1/5 à 1/15, de préférence à 1/10 du diamètre du tuyau d'échappement (18).
  10. Silencieux selon au moins l'une des revendications précédentes, la largeur (b) de chaque élément de tourbillonnement (40), vue transversalement par rapport au sens de l'écoulement (R) du courant de gaz d'échappement, étant choisie de telle sorte qu'elle correspond à 1/2 à 1/4, de préférence à 1/3 du diamètre du tuyau d'échappement (18).
  11. Silencieux selon au moins l'une des revendications précédentes, la longueur (1) de chaque élément de tourbillonnement (40), vue dans le sens de l'écoulement (R) du courant de gaz d'échappement, étant choisie de telle sorte qu'elle correspond à 1/3 à 1/12, de préférence à 1/6 du diamètre du tuyau d'échappement (18).
  12. Silencieux selon au moins l'une des revendications précédentes, le bloc silencieux étant un silencieux à réflexion (34) ou un résonateur (24).
  13. Dispositif d'échappement pour un véhicule automobile muni d'un silencieux (10) selon l'une des revendications 1 à 12.
EP20040017953 2003-08-27 2004-07-29 Silencieux et dispositif d'échappement Expired - Lifetime EP1510668B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10339290 2003-08-27
DE2003139290 DE10339290A1 (de) 2003-08-27 2003-08-27 Schalldämpfer sowie Abgasanlage

Publications (3)

Publication Number Publication Date
EP1510668A1 EP1510668A1 (fr) 2005-03-02
EP1510668B1 true EP1510668B1 (fr) 2006-06-14
EP1510668B8 EP1510668B8 (fr) 2006-09-13

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ID=34089199

Family Applications (1)

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EP20040017953 Expired - Lifetime EP1510668B8 (fr) 2003-08-27 2004-07-29 Silencieux et dispositif d'échappement

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EP (1) EP1510668B8 (fr)
DE (2) DE10339290A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009059684A1 (de) * 2009-12-19 2011-06-22 J. Eberspächer GmbH & Co. KG, 73730 Abgasbehandlungseinrichtung
CN105986853B (zh) 2015-02-05 2020-01-17 福特环球技术公司 消声器
CN109057917A (zh) * 2018-09-27 2018-12-21 上海天纳克排气系统有限公司 消音器
CN109026301A (zh) * 2018-10-12 2018-12-18 天纳克汽富晟(长春)汽车零部件有限公司 尾气后处理组件
CN113482754A (zh) * 2021-07-30 2021-10-08 重庆长安汽车股份有限公司 一种消声装置及车辆

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388804A (en) * 1981-08-17 1983-06-21 J. I. Case Company Exhaust assembly for tractors
DE19639079A1 (de) * 1996-09-24 1998-03-26 Gillet Heinrich Gmbh Schalldämpfer
US5959263A (en) * 1998-05-07 1999-09-28 Biggs Manufacturing, Inc. Bypass muffler

Also Published As

Publication number Publication date
EP1510668A1 (fr) 2005-03-02
DE10339290A1 (de) 2005-04-07
EP1510668B8 (fr) 2006-09-13
DE502004000756D1 (de) 2006-07-27

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