EP0794324A2 - Silencieux d'échappement à réflexion et absorption combinées à plusieurs chambres - Google Patents

Silencieux d'échappement à réflexion et absorption combinées à plusieurs chambres Download PDF

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Publication number
EP0794324A2
EP0794324A2 EP97102548A EP97102548A EP0794324A2 EP 0794324 A2 EP0794324 A2 EP 0794324A2 EP 97102548 A EP97102548 A EP 97102548A EP 97102548 A EP97102548 A EP 97102548A EP 0794324 A2 EP0794324 A2 EP 0794324A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
chamber
silencer according
jacket
absorption
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.)
Granted
Application number
EP97102548A
Other languages
German (de)
English (en)
Other versions
EP0794324A3 (fr
EP0794324B1 (fr
Inventor
Siegfried Wörner
Rudolf Buhmann
Dieter Spohn
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 EP0794324A2 publication Critical patent/EP0794324A2/fr
Publication of EP0794324A3 publication Critical patent/EP0794324A3/fr
Application granted granted Critical
Publication of EP0794324B1 publication Critical patent/EP0794324B1/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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using 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
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/04—Metallic wool, e.g. steel wool, copper wool or the like
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
    • 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
    • F01N2470/06—Tubes being formed by assembly of stamped or otherwise deformed sheet-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow

Definitions

  • the invention relates to a combined reflection-absorption aggas muffler in a multi-chamber design, in particular for heavy commercial vehicles, with a reflection chamber and an absorption chamber.
  • Reflection silencers cause both a reflection of the sound waves to the sound source and a multiplication of sound points (e.g. through perforated or slotted eaves), which bring about an improvement through interference.
  • a reflection silencer consists of chambers that are connected to each other by pipes. Reflection dampers are particularly effective in the low-frequency range. So-called three-way dampers with a large number of variants have proven their worth. As a rule, there are two to seven acoustic elements (e.g. cross-sectional jumps, deflections, row and Branch resonants and built-in intermediate pipes) available. The position of the muffler in the pipe essentially determines the quality of the damping. If the reflection damper is at the end of the line, the length of the tailpipe is important for the overall attenuation.
  • the outer jacket comes into direct contact with the exhaust gas, very high surface temperatures can arise - especially because silencers are increasingly integrated into the underbody group to reduce air resistance.
  • the outer jacket can be double-walled and with an insulation layer (e.g. made of mineral or ceramic fibers).
  • absorption silencers consist of a perforated pipe through which the exhaust gas is directed and which is surrounded by a chamber lined with sound-absorbing material.
  • the sound waves penetrate into the sound absorbing material via the round hole, slot hole or slot bridge perforation of the exhaust pipe carrying the exhaust gas.
  • the sound energy is converted into heat by friction in the absorption material.
  • the effect of an absorption damper depends, among other things. on the geometry of the perforation, the degree of sound absorption and the density of the stuffing used.
  • Absorption silencers provide broadband damping and generally cause less pressure loss than comparable reflection silencers.
  • the sound absorbent must be resistant to thermal and chemical effects, but also resistant to high-frequency exhaust gas pressure pulsation and mechanical vibration. Mineral or metal wool or a combination of the two is used as sound absorption material. Basalt wool is usually used, occasionally in combination with stainless steel wool.
  • acoustic fine tuning z. B. perforated eaves or Venturi nozzles can be provided. The latter will be venturi used against low-frequency sound components.
  • the invention has for its object to provide a combined absorption-reflection exhaust gas silencer of the type mentioned, which is simple in construction and is particularly suitable as a 78 dB damper for heavy commercial vehicles with a 6 and 8 cylinder engine.
  • the muffler is advantageously further developed by the features according to claims 2 to 18.
  • a substantially T-shaped exhaust gas inlet pipe is provided with a jacket-side exhaust gas inlet and a T-shaped exhaust gas branch, one end of which in the absorption chamber and the other end lies in the reflection chamber, the front ends of the T-shaped exhaust branch being closed and jacket-side outflow openings being formed both on the absorption chamber side and on the reflection chamber side.
  • the first jacket-side outlet openings assigned to the absorption chamber are preferably smaller than the second jacket-side outlet openings assigned to the reflection chamber.
  • the first and second jacket-side outlet openings can be formed on the jacket side of the exhaust gas branch, preferably facing away from the exhaust gas inlet.
  • a particularly advantageous development of the invention is characterized in that an exhaust gas outlet pipe is provided is whose inlet is arranged in the reflection chamber and extends at least partially through the absorption chamber, the exhaust gas outlet pipe in the jacket section associated with the absorption chamber containing further outflow openings.
  • the inlet of the exhaust gas outlet pipe is expediently provided with a Venturi nozzle or outflow nozzle.
  • the section of the exhaust gas outlet pipe assigned to the absorption chamber comprises a pipe region which is bent by approximately 180 ° and which contains the further exhaust gas outflow openings.
  • the muffler is preferably designed as a 2-chamber pot with a single outer jacket and a radial intermediate floor, which divides the interior of the muffler into the absorption chamber and the reflection chamber, with an edge absorption being integrated on the reflection chamber side on the outer jacket and on the front-side outer floor.
  • the edge absorption of the front outer floor is in particular in the form of a package arrangement in a sandwich construction, consisting of a perforated inner floor, a stainless steel wool fitting, a structure-borne sound floor, an insulating mat in two layers and a pot-like outer floor part.
  • the edge absorption of the outer shell of the muffler is preferably a perforated inner cage arranged on the inside of the reflection chamber of the outer shell with an intermediate insulating mat, which not only ensures good structure-borne sound insulation but also good thermal insulation of the outer shell.
  • An exhaust gas inlet pipe is preferably provided with an inlet which extends through the outer jacket of the muffler, in particular on the side of the absorption chamber.
  • the exhaust gas outlet pipe has in particular an outlet which also extends through the outer shell of the muffler, but in particular on the side of the reflection chamber.
  • Exhaust gas inlet pipe and exhaust gas outlet pipe are in particular at least partially formed sheet metal parts which can be composed of half-shells and welded to one another.
  • the area of the exhaust gas outlet pipe assigned to the absorption chamber can be at least partially wrapped with a layer of stainless steel wool.
  • An exhaust air tube preferably opens into the reflection chamber.
  • the silencer system is particularly suitable for heavy commercial vehicles.
  • the 2-chamber damper has an integrated edge absorption on the outer jacket and on the front outer floor on the reflection chamber side.
  • the muffler inlet is via a T-shaped outflow of the inner inlet pipe, which is coupled to the absorption chamber via a perforation and to the reflection chamber via an outflow shower.
  • the silencer exits via an outlet nozzle from the reflection chamber, wherein a coupling to the absorption chamber is provided by a perforation.
  • the combined reflection-absorption exhaust gas silencer 20 shown is designed in a multi-chamber design as a so-called 2-chamber pot. It has a single outer cross section 16 that is essentially oval to rectangular in cross section, a radial intermediate floor 17 being provided, which divides the interior of the muffler 20 into a right-hand reflection chamber 1 as shown in the drawing and an absorption chamber 2 as shown on the left.
  • the latter absorption chamber 2 - apart from the interior of the exhaust gas-carrying pipes to be described there - is filled with a sound-absorbing substance 21.
  • Both end or outer floors and the radial intermediate floor 17 of the 2-chamber pot, which is parallel to this, are essentially flat.
  • Both the exhaust gas inlet and the exhaust gas outlet extend through the outer jacket 16.
  • the exhaust gas inlet is located on the side of the absorption chamber 2, while the exhaust gas outlet is located on the side of the reflection chamber 1.
  • the muffler 20 has on the exhaust gas inlet side a one-part or multi-part essentially T-shaped exhaust gas inlet pipe 4 with a jacket-side Exhaust gas inlet and a T-shaped exhaust gas branch, one end of which is arranged in the absorption chamber 2 and the other end of which is arranged in the reflection chamber 1.
  • the front ends of the T-shaped exhaust branch are closed, and the rectilinear part of the exhaust branch which extends in the axial direction of the muffler has outlet openings 5, 6 on the jacket side both on the absorption chamber side and on the reflection chamber side.
  • the first jacket-side outflow openings 5 on the absorption chamber side have a smaller diameter than the second jacket-side outflow openings 6 on the reflection chamber side.
  • the muffler 20 On the outlet side, the muffler 20 has a single-part or multi-part exhaust gas outlet pipe 15 with a venturi nozzle 7 on the inlet side parallel to the straight-line part of the T-shaped exhaust branch of the exhaust gas inlet pipe 4 containing the outlet openings 5, 6.
  • the Venturi nozzle 7 has its inlet on the reflection chamber side, extends in a conical extension through the wall of the radial intermediate floor 17 into the absorption chamber 2 and merges there into a 180 ° curved section of the exhaust gas outlet pipe 15.
  • the further jacket-side outflow openings 8 are in groups along a radial flow cross-section, thus arranged essentially in a star shape according to the drawing in plan view.
  • the same number of openings 8 is located in each individual group of a flow cross section.
  • the last-mentioned aza number of openings 8 in particular also contains each flow cross-section of the T-shaped exhaust branch in the area of openings 5 of the same size, the tube diameter of the T-shaped exhaust branch preferably having the same tube diameter as the 180 ° elbow section.
  • the exhaust gas outlet pipe 15 extends parallel to the Venturi nozzle 7 back into the reflection chamber 1 and finally ends after a curvature on the outer jacket or outside of the outer jacket 16 for a connection to an end pipe of the exhaust system which is not of interest here.
  • an edge absorption for structure-borne sound insulation and thermal insulation is provided on the outer floor 18 of the muffler 20, which is on the right-hand side according to the drawing, and on the outer jacket 16.
  • the edge absorption on the front outer floor 18 is realized in particular in the form of a package arrangement in a sandwich construction, the package consisting of a perforated inner floor 9, a stainless steel wool molding 10, a structure-borne sound floor 19, an insulating mat in two layers 11, 12 and a pot-like outer floor part 13.
  • the edge absorption on the outer jacket 16 is achieved by a perforated inner cage 14 which is concentric with the outer jacket on the inside of the reflection chamber of the outer jacket 16 is arranged at a distance, an insulating mat 3 being provided in the intermediate space.
  • Exhaust gas inlet pipe 4 and the exhaust gas outlet pipe 15 are at least partially formed as sheet metal parts, the sheet metal parts being half-shells which are assembled and welded to one another.
  • An exhaust pipe (not shown) opens into the reflection chamber 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP97102548A 1996-03-05 1997-02-18 Silencieux d'échappement à réflexion et absorption combinées à plusieurs chambres Expired - Lifetime EP0794324B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19608273A DE19608273A1 (de) 1996-03-05 1996-03-05 Kombinierter Reflexions-Absorptions-Abgas-Schalldämpfer in Mehrkammerbauweise
DE19608273 1996-03-05

Publications (3)

Publication Number Publication Date
EP0794324A2 true EP0794324A2 (fr) 1997-09-10
EP0794324A3 EP0794324A3 (fr) 1998-05-06
EP0794324B1 EP0794324B1 (fr) 2002-08-28

Family

ID=7787151

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102548A Expired - Lifetime EP0794324B1 (fr) 1996-03-05 1997-02-18 Silencieux d'échappement à réflexion et absorption combinées à plusieurs chambres

Country Status (2)

Country Link
EP (1) EP0794324B1 (fr)
DE (2) DE19608273A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008073137A1 (fr) * 2006-12-14 2008-06-19 Ocv Intellectual Capital, Llc Systeme de silencieux composite a thermoplastique a fibres longues pourvu d'une chambre reflective integree
WO2008110252A1 (fr) * 2007-03-09 2008-09-18 Festo Ag & Co. Kg Amortisseur sonore à air comprimé destiné à des applications pneumatiques
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
AT510788A1 (de) * 2010-10-28 2012-06-15 Avl List Gmbh Abgasschalldämpferanordnung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7934580B2 (en) 2006-04-12 2011-05-03 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system
CN109386505B (zh) * 2017-08-09 2022-02-11 开利公司 用于制冷装置中的消音器以及制冷装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE866744C (de) * 1950-11-07 1953-02-12 Eberspaecher J Schallabsorber fuer speziell im Auspuff von Zweitaktern enthaltene Knackgeraeusche extrem steiler Druckfront
GB1446553A (en) * 1972-12-06 1976-08-18 Nicoll W L G Mufflers
DE9308419U1 (de) * 1993-06-05 1994-10-13 Roth-Technik GmbH, 76571 Gaggenau Schalldämpfer für vorzugsweise gasförmige Medien

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
WO2008073137A1 (fr) * 2006-12-14 2008-06-19 Ocv Intellectual Capital, Llc Systeme de silencieux composite a thermoplastique a fibres longues pourvu d'une chambre reflective integree
WO2008110252A1 (fr) * 2007-03-09 2008-09-18 Festo Ag & Co. Kg Amortisseur sonore à air comprimé destiné à des applications pneumatiques
AT510788A1 (de) * 2010-10-28 2012-06-15 Avl List Gmbh Abgasschalldämpferanordnung
AT510788B1 (de) * 2010-10-28 2012-10-15 Avl List Gmbh Abgasschalldämpferanordnung

Also Published As

Publication number Publication date
EP0794324A3 (fr) 1998-05-06
EP0794324B1 (fr) 2002-08-28
DE19608273A1 (de) 1997-09-11
DE59708027D1 (de) 2002-10-02

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