EP0243559B1 - Silencieux pour courant gazeux - Google Patents

Silencieux pour courant gazeux Download PDF

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Publication number
EP0243559B1
EP0243559B1 EP86401886A EP86401886A EP0243559B1 EP 0243559 B1 EP0243559 B1 EP 0243559B1 EP 86401886 A EP86401886 A EP 86401886A EP 86401886 A EP86401886 A EP 86401886A EP 0243559 B1 EP0243559 B1 EP 0243559B1
Authority
EP
European Patent Office
Prior art keywords
envelope
sleeve
orifice
gas
chamber
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
EP86401886A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0243559A1 (fr
Inventor
Jean-Paul Boet
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.)
Sa Andre Boet SA
Original Assignee
Sa Andre Boet SA
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 Sa Andre Boet SA filed Critical Sa Andre Boet SA
Priority to AT86401886T priority Critical patent/ATE54721T1/de
Publication of EP0243559A1 publication Critical patent/EP0243559A1/fr
Application granted granted Critical
Publication of EP0243559B1 publication Critical patent/EP0243559B1/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
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

Definitions

  • the present invention relates to silencers for gas streams comprising means for attenuating the noises caused by the expansion of the gases.
  • the latter consists mainly of a manifold connected to the engine and a silencer connected on the one hand, to this manifold and on the other hand, to an exhaust manifold.
  • the muffler and especially the silencer prevent gases from being released into the atmosphere with such physical criteria.
  • the muffler is the predominant element in which the gases relax and cool during their journey inside while maintaining an acceptable external noise level, despite the relaxation of these gases.
  • the known silencers consist of an elongated casing provided with an inlet orifice and a gas outlet orifice, which are respectively provided at its ends and to which are connected on the one hand, the manifold and on the other hand, the exhaust manifold.
  • One or more tubes, most often pierced with radial orifices, are arranged in the envelope and can also be surrounded by a fibrous coating thus lowering the noise level.
  • the path of the exhaust gases is nevertheless, substantially direct between the two ends of the casing, which affects the noise attenuation efficiency since it is transferred directly from the inlet to the outlet of the muffler.
  • the use of such mufflers reduces the power of the engine.
  • the object of the present invention is to optimize the expansion of gases in such silencers by maximizing the volume into which said gases open.
  • the silencer of the type described above is characterized in that the end of the gas intake manifold opens into said elongated casing at the level of said inlet orifice formed in said casing.
  • the end of said ferrule located in the chamber facing the inlet orifice may have a conical shape or the like.
  • the end of said ferrule located in the chamber facing the outlet orifice may have a conical shape or the like.
  • the envelope, the ferrule and the tubing are of the shape of revolution and are coaxial with one another.
  • the transverse partition dividing the shell into two adjacent chambers, is arranged in a plane perpendicular to the axis of said shell.
  • the two rooms can have an identical volume.
  • the ferrule comprises, at least in the first chamber facing the gas inlet orifice, a plurality of radial perforations.
  • a fibrous coating can be arranged at least in the chamber of said shell facing the gas inlet orifice.
  • the ends of said ferrule may also have a conical or similar shape.
  • the axis of the ferrule can be offset from the axis of the envelope.
  • a heat engine 1 of the internal combustion type to which is connected an exhaust 2 consisting mainly of a manifold 3 connected to the exhaust ports of the engine, a silencer 4 and an exhaust manifold 5.
  • the passage of the gas stream from the engine 1 takes place through the various elements mentioned in the exhaust pipe 2.
  • the silencer 4 for the gas stream according to the invention comprises a casing 7, of substantially elongated shape, provided with an orifice 8 for the entry of gases at a end 9 of the casing and a gas outlet orifice 10 at the other end 11 of the casing.
  • the gas inlet port 8 receives one end 12 of the manifold manifold 3 and the gas outlet port 10 receives one end 15 of the exhaust manifold 5.
  • the gas stream flowing in the silencer 4 is shown symbolically by arrows 16.
  • these expansion means consist on the one hand, by a ferrule 18 held against the internal wall 19 of the casing 7 by means of fixing lugs 20 and on the other hand, by the end 15 of the exhaust manifold 5.
  • the ferrule 18 comprises a transverse partition 23 which divides the interior volume of this ferrule into two adjacent chambers 24 and 25.
  • the chamber 24 is a view of the gas inlet orifice 8 while the chamber 25 is opposite the gas outlet orifice 10.
  • a communication passage 27 is formed between the outer wall 28 of the shell 18 and the inner wall 19 of the casing 7 thus allowing the transfer and evacuation of the gases from the chamber 24 receiving the gases from the manifold, at the chamber 25 in communication with the gas outlet pipe.
  • the length L of the ferrule 18 extends over most of the length L1 of the casing 7.
  • the ferrule 18 and the casing 7 are of the shape of revolution and are coaxial around an axis 30. Similarly, the end 12 of the manifold and the end 15 of the tubing exhaust 5 are coaxial with this axis 30.
  • the ferrule 18 also comprises in the first chamber 24, radial perforations 31 which have the purpose of reducing natural frequencies due to the coupling of the two adjacent chambers.
  • the expansion means according to the invention also consist of the end 15 of the exhaust pipe 5 arranged projecting in the chamber 25 of the shell so that the face 34 of said end 15 is opposite the partition 23
  • the arrangement of the end 15 in the chamber 25 then has an additional impedance against the gases before their ejection into the atmosphere.
  • a small part of the gases also passes through the radial perforations 31 formed in the first chamber 24 of the shell.
  • the gases 16 then propagate towards the partition 23, then orient themselves towards the exhaust pipe 5, where they rush in until they are ejected into the atmosphere.
  • the acoustic level reached by the gases being further lowered by virtue of the end 15 protruding in the second chamber 25 since the end 15 increases the gas output impedance.
  • the noise level obtained at the outlet of the exhaust manifold then gives particularly satisfactory results.
  • the silencer of the invention based on the acoustic coupling between two chambers defined by the shell, makes it possible to obtain a significant acoustic attenuation of the noise.
  • this silencer can be summarized by the fact that its transfer function is that of a low-pass filter with two degrees of freedom, that is to say that all frequencies above its cutoff frequency are strongly attenuated and the frequencies below it are weakly attenuated.
  • FIG. 3 illustrates an alternative embodiment for which the ends 35 and 36 of the shell 18 have been modified. They are presented in a conical shape.
  • Figure 4 illustrates an alternative embodiment ature for which the chamber 24 facing the orifice 8 of the gas inlet is covered with a fibrous coating 40 such as a mineral wool mattress.
  • a metal casing 41 pierced with orifices 42, maintains the fibrous coating 40 against the shell 18 and the partition 23. This treatment promotes the damping of the natural frequencies.
  • FIG. 5 illustrates an alternative embodiment, which consists in off-centering the shell 18 of the envelope 7.
  • the shell is integral with the envelope by means, for example, of a weld.
  • the new geometric axis 45 of the shell 18 is offset with respect to the axis 30 of the envelope.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Compressor (AREA)
EP86401886A 1986-04-30 1986-08-27 Silencieux pour courant gazeux Expired - Lifetime EP0243559B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401886T ATE54721T1 (de) 1986-04-30 1986-08-27 Schalldaempfer fuer gasstrom.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8606304A FR2598176B1 (fr) 1986-04-30 1986-04-30 Silencieux pour courant gazeux
FR8606304 1986-04-30

Publications (2)

Publication Number Publication Date
EP0243559A1 EP0243559A1 (fr) 1987-11-04
EP0243559B1 true EP0243559B1 (fr) 1990-07-18

Family

ID=9334808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401886A Expired - Lifetime EP0243559B1 (fr) 1986-04-30 1986-08-27 Silencieux pour courant gazeux

Country Status (5)

Country Link
EP (1) EP0243559B1 (es)
AT (1) ATE54721T1 (es)
DE (1) DE3672829D1 (es)
ES (1) ES2002833A6 (es)
FR (1) FR2598176B1 (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS271879B1 (en) * 1988-08-16 1990-12-13 Jaroslav Cervinka Exhaust silencer for internal combustion engines
DE3832030A1 (de) * 1988-09-21 1990-03-29 Wabco Westinghouse Fahrzeug Geraeuschdaempfer
FR2713701B1 (fr) * 1993-12-14 1996-03-01 Boet Sa Andre Silencieux pour courant gazeux.
FR2713702B1 (fr) * 1993-12-14 1996-03-01 Boet Sa Andre Silencieux pour courant gazeux.
DE10303947A1 (de) * 2003-01-31 2004-08-19 J. Eberspächer GmbH & Co. KG Schalldämpfer für ein Heizgerät, insbesondere Fahrzeugheizgerät
DE102010008403A1 (de) * 2010-02-18 2011-08-18 J. Eberspächer GmbH & Co. KG, 73730 Schalldämpfer
GB2479787A (en) * 2010-04-23 2011-10-26 Exhausts Uk Ltd Exhaust silencer with acoustic reducer cup
DE102017107602B3 (de) 2017-04-10 2018-09-20 Gardner Denver Deutschland Gmbh Kompressoranlage mit interner Luft-Wasser-Kühlung
DE102017107599A1 (de) 2017-04-10 2018-10-11 Gardner Denver Deutschland Gmbh Pulsations-Schalldämpfer für Kompressoren
DE102017107601B4 (de) 2017-04-10 2019-11-07 Gardner Denver Deutschland Gmbh Verfahren zur Steuerung eines Schraubenverdichters
CN108926266B (zh) * 2017-05-27 2021-10-26 广东美的生活电器制造有限公司 消音盖、杯盖组件和食物料理机
US11391195B2 (en) * 2019-06-19 2022-07-19 Tenneco Automotive Operating Company Inc. Exhaust system and muffler

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE513629A (es) *
DE918062C (de) * 1948-12-31 1954-09-16 Leistritz Maschfabrik Paul Schalldaempfer mit aufeinanderfolgenden Kammern
FR1226438A (fr) * 1958-10-09 1960-07-11 Silencieux pour l'écoulement des fluides
US3651888A (en) * 1970-07-24 1972-03-28 Tenneco Inc Multi-pass muffler
US4220219A (en) * 1978-09-14 1980-09-02 Flugger Ray T Lightweight muffler and method for muffling noise

Also Published As

Publication number Publication date
DE3672829D1 (de) 1990-08-23
ATE54721T1 (de) 1990-08-15
ES2002833A6 (es) 1988-10-01
EP0243559A1 (fr) 1987-11-04
FR2598176B1 (fr) 1990-01-19
FR2598176A1 (fr) 1987-11-06

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