EP0708880B1 - Standardisierte fischgrätschalldämpfer für brennkraftmaschinen - Google Patents

Standardisierte fischgrätschalldämpfer für brennkraftmaschinen Download PDF

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Publication number
EP0708880B1
EP0708880B1 EP95933221A EP95933221A EP0708880B1 EP 0708880 B1 EP0708880 B1 EP 0708880B1 EP 95933221 A EP95933221 A EP 95933221A EP 95933221 A EP95933221 A EP 95933221A EP 0708880 B1 EP0708880 B1 EP 0708880B1
Authority
EP
European Patent Office
Prior art keywords
silencers
gas flow
silencer
diaphragms
fishbone
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
EP95933221A
Other languages
English (en)
French (fr)
Other versions
EP0708880A1 (de
Inventor
Paul Eugène Alois DECLERCQ
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0708880A1 publication Critical patent/EP0708880A1/de
Application granted granted Critical
Publication of EP0708880B1 publication Critical patent/EP0708880B1/de
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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with exhaust gas flow passages
    • 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

Definitions

  • the invention relates to silencers.
  • the object of the invention is to provide a silencer with which these drawbacks can be avoided. This object is achieved with a silencer according to claim 1.
  • Back pressure or head loss build-up is close to zero, thanks also to the absence of acoustic jamming.
  • the sound waves do move into each of the numerous shallow cells, by diffraction ( ⁇ > d),and are converted from frontal waves into concentric ones, which results in axial smoothing out of the sound pressure variations.
  • noise reduction is intensified for the same overall silencer dimensions.
  • the silencer is composed by an enclosure (1, 2), with preferably a near circular or elliptic cross section, to which the up- (3) and downstream pipes (4) are connected.
  • This enclosure is subdivided longitudinally into a high number of shallow cells, by transversal diaphragms (5).
  • the (exhaust) gas flows through (circular) holes in the diaphragms, approx. the same diameter as the up-and downstream pipe diameter, and aligned with these.
  • a high passage rate perforated pipe or mesh (6) may be running through the diaphragm holes (fig. 1& 2). This perforated pipe would facilitate the assembly and improve further the gas flow, and heat exchange.
  • the fishbone subdivision may be obtained by the introduction of a cartridge (ceramic, sintered, cast, extruded, etc.) (fig. 5), or the silencer might be produced as a monolithic construction (ceramic, sintered, casting, extrusion, etc.) (fig. 6).
  • This ratio sr should be ⁇ 0.5.
  • the high number of diaphragms stiffens the enclosure, and eliminates shell noise (fig. 1, 2, 3).
  • Metallic silencers of this type have their structure so well cooled that they act as heat exchangers, consequently as extractors, which improves the engine's performance.
  • the new silencer is made of one single material (fig. 1-4; fig. 6) or, alternatively, is fitted with (a)cartridge(s), which is (are) easily introduced or exchanged for overhaul (fig. 5).
  • a cartridge implies a generally cylindrical shape.
  • Cross sections should be near circular or elliptic, while they are acoustically the stiffest, and allow the thinnest mantle material thickness, avoiding shell noise.
  • the diaphragms should be stiff enough and well clamped, not to transmit noise to the next cell by vibrating themselves. They can be simply or doubly curved (stamped) for maximum stiffness and lightness, and acoustical efficiency (fig. 2)
  • Their clamping can be by heat-shrinking of the mantle around them (either of a complete cylinder which is heated, or by the shrinkage of 1 or 2 longitudinal welds, (1 open shell or 2 part-shells) f.i.
  • the gas flow channel can be concentric but may be eccentric (fig. 3 & 4).

Landscapes

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

Claims (5)

  1. Ein Schalldämpfer bestehend aus einem Behälter mit Ein- und Auslaßkanälen, innerhalb welcher dicht aneinander angeordnete Diafragmen zahlreiche niedrige Zellen gestalten, dabei eine Fischgräteneinteilung formend, die Gase fließend durch Öffnungen in die Diafragmen,
    die Niedrigkeit der Zellen gekennzeichnet von der Ratio: ai/t ,
    wobei:
    ai der Abstand zwischen den Diafragmen ist, vermessen in der Richtung der Gasflüsse,
    t das mittlere Quermaß des Behälters ist,
    diese Ratio ≤ 0,5 seiend, die Diafragmen flach seiend oder einfach oder doppelt gekrümmt,
    die Gasflußöffnungen zentral sitzend in dem Behälter (Fig. 1, 2, 5, 6) oder exzentrisch (Fig. 3, 4),
    ein (Fig. 1, 2, 3, 5, 6) oder mehrere (Fig. 4) Gasflüsse gebend durch einen einzelnen Schalldämpfer.
  2. Ein Schalldämpfer gemäß Anspruch 1 mit einem perforiertem Rohr laufend durch die Öffnungen jedem Gasfluß angehörend.
  3. Ein Schalldämpfer gemäß Ansprüchen 1 und 2 in welchem die Fischgrateinteilung von einem Einsatz dargestellt wird.
  4. Ein Schalldämpfer gemäß Ansprüchen 1 und 2 welcher als Monolith hergestellt wird (Fig. 6).
  5. Ein Schalldämpfer gemäß Ansprüchen 1, 2, 3 und 4, welcher aus Aluminiumlegierung hergestellt wird.
EP95933221A 1992-10-02 1992-10-02 Standardisierte fischgrätschalldämpfer für brennkraftmaschinen Expired - Lifetime EP0708880B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1992/002290 WO1993019287A1 (en) 1992-10-02 1992-10-02 Fishbone standardised silencers for (internal) combustion engines

Publications (2)

Publication Number Publication Date
EP0708880A1 EP0708880A1 (de) 1996-05-01
EP0708880B1 true EP0708880B1 (de) 1998-07-08

Family

ID=8165688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95933221A Expired - Lifetime EP0708880B1 (de) 1992-10-02 1992-10-02 Standardisierte fischgrätschalldämpfer für brennkraftmaschinen

Country Status (4)

Country Link
EP (1) EP0708880B1 (de)
AT (1) ATE168167T1 (de)
AU (1) AU2679992A (de)
WO (1) WO1993019287A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0018620D0 (en) * 2000-07-28 2000-09-13 Draftex Ind Ltd Noise attenuation arrangements for pressurised-gas conduits

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2502709A (en) * 1940-11-01 1950-04-04 Harley A Dorman Exhaust muffler including plural venturi elements
US3655010A (en) * 1970-07-17 1972-04-11 Tenneco Inc Acoustic conduit with wrinkle section
US4287962A (en) * 1977-11-14 1981-09-08 Industrial Acoustics Company Packless silencer
DE3101252A1 (de) * 1981-01-16 1982-09-02 Alcan Aluminiumwerke GmbH, 3400 Göttingen Abgasschalldaempfer fuer brennkraftmaschinen und verfahren zu dessen herstellung

Also Published As

Publication number Publication date
WO1993019287A1 (en) 1993-09-30
EP0708880A1 (de) 1996-05-01
AU2679992A (en) 1993-10-21
ATE168167T1 (de) 1998-07-15

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