WO1998019054A1 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
WO1998019054A1
WO1998019054A1 PCT/EP1997/006018 EP9706018W WO9819054A1 WO 1998019054 A1 WO1998019054 A1 WO 1998019054A1 EP 9706018 W EP9706018 W EP 9706018W WO 9819054 A1 WO9819054 A1 WO 9819054A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
helical
outer ring
silencer according
internals
Prior art date
Application number
PCT/EP1997/006018
Other languages
German (de)
English (en)
Inventor
Burkhard Gelhar
Henrik Kluge
Dieter Lohmann
Original Assignee
Deutsches Zentrum für Luft- und Raumfahrt e.V.
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 Deutsches Zentrum für Luft- und Raumfahrt e.V. filed Critical Deutsches Zentrum für Luft- und Raumfahrt e.V.
Priority to DE29723969U priority Critical patent/DE29723969U1/de
Publication of WO1998019054A1 publication Critical patent/WO1998019054A1/fr

Links

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
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels 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
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels

Definitions

  • the invention relates to a silencer for internal combustion engines.
  • a silencer device for engines, compressors etc. which has a perforated outlet pipe that allows the passage of outlet gases and is arranged in an annular casing.
  • the space between the outlet pipe and the casing is filled with a sound wave absorbing material.
  • a helical or helical sheet is arranged in the outlet pipe, which forces the outlet gas to move in a helical manner, whereby it nestles very closely against the perforated wall of the outlet pipe. The exit movement is thus guided in the direction of the helical wall.
  • CH 313 645 discloses a sound attenuation device with two coaxially arranged tubes within a housing. The tubes have perforated walls.
  • a screw is inserted between the inner and outer tube, the inner tube being filled with a refractory fiber material.
  • the exit gas therefore flows helically through the annular space created between the outer and inner tube, part of the gas penetrating into the layer of refractory material provided between the housing and the outer tube and another part into the fiber material in the inner tube. This expands the gas.
  • the object of the invention is to provide improved sound damping for internal combustion engines.
  • This object is achieved in that helical internals are provided in the silencer duct, and in that the duct is surrounded by an outer ring duct, the outer ring duct being filled with a gas. Further developments of the invention are defined in the subclaims.
  • Helical internals also have the advantage of creating helical channels, so that compared to silencer designs without a helix, the same volume can be accommodated in a smaller outer container. This not only saves material and makes the silencer lighter, it also has the other advantages of lower external volume.
  • the helical internals create a more uniform flow, especially in comparison to chamber systems, which leads to a reduction in flow resistance and thus to lower losses.
  • the outer ring channel is filled with a gas, particularly preferably with air.
  • the combustion gas emerging from the channel can therefore enter the outer ring channel unhindered, as a result of which the sound waves can also be conducted away unhindered. This leads to the desired sound attenuation.
  • helical internals can be provided in a variety of different shapes. Depending on the pitch of the helical screw, an optimal back pressure can be generated for a specific air flow.
  • the ratio of pitch to diameter of the helical screw is less than 20 and greater than 1, it is particularly preferred if the ratio is 6.
  • the pitch is the length of the screw for one period, measured on the axis. Such conditions can still be achieved by bending a surface area and at the same time are highly effective as damping.
  • a very low back pressure can also be set by a specific choice of the use of the helical surfaces.
  • the pitch of the helical screw is constant.
  • the material used for example the sheet metal, warps somewhat.
  • the constant pitch would fluctuate around an average or remain essentially constant.
  • Fig. 1 is a perspective, partially sectioned illustration of an embodiment of the invention.
  • FIG. 2 shows a schematic sectional illustration through a silencer from FIG. 1.
  • Fig. 1 shows the essential components of the silencer according to the invention.
  • An internal combustion engine (not shown, for example a 2-cylinder aircraft engine) with two cylinders discharges its exhaust gases via two ports 1 and 2, from right to left in the illustration.
  • Exhaust manifolds 3 and 4 begin at connections 1 and 2. These feed the exhaust gas to the actual silencer 7 via compensators 5 and 6.
  • the muffler 7 has an outer casing 10.
  • the casing 10 is fastened to the fuselage (not shown) in this example by means of a schematically indicated fastening 11.
  • the outer jacket 10 forms an outer annular channel 12. This can have a circular cross section, but is oval in the exemplary embodiment shown.
  • the inner tubes 20 and 21 each surround an inner channel 22 and 23, respectively. This should be given special consideration in the following with regard to the invention.
  • helical internals 30 are provided in the two inner channels 22 and 23.
  • the helical internals 30 consist of one of the external requirements of the exhaust gas resistant material, in particular a corresponding metal.
  • the helical internals 30 form a helical screw with a ratio of pitch to diameter of less than 20 and more than 1, in particular 6. They are obtained by bending a metallic surface piece.
  • the inner tubes 20 and 21 themselves can be made of a similar material and have perforations (not shown).
  • the inner channels 22 and 23 are connected to the outer ring channel 12 through these perforations.
  • the outer ring channel 12 is filled with a gas, in particular with air.
  • each of the helical internals 30 is used from both sides at the same time as a boundary wall of the flow, unlike with separate chambers and constrictions or also with baffle-like internals. Not only the internals, but also the flow is helical. Since the flow resistance to the exit from the perforations into the outer ring channel is low, depending on their dimensions and in comparison, low sound insulation can be achieved.

Landscapes

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

Abstract

Un silencieux pour moteurs à combustion comporte une conduite (22, 23) par laquelle passent les gaz d'échappement. Dans cette conduite (22, 23) sont installées des pièces hélicoïdales de manière à atténuer le bruit des gaz d'échappement. La conduite (22, 23) est entourée d'un canal annulaire rempli d'un gaz.
PCT/EP1997/006018 1996-10-31 1997-10-31 Silencieux WO1998019054A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29723969U DE29723969U1 (de) 1996-10-31 1997-10-31 Schalldämpfer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996144089 DE19644089A1 (de) 1996-10-31 1996-10-31 Schalldämpfer
DE19644089.0 1996-10-31

Publications (1)

Publication Number Publication Date
WO1998019054A1 true WO1998019054A1 (fr) 1998-05-07

Family

ID=7809789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/006018 WO1998019054A1 (fr) 1996-10-31 1997-10-31 Silencieux

Country Status (2)

Country Link
DE (2) DE19644089A1 (fr)
WO (1) WO1998019054A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19932714A1 (de) * 1999-07-16 2001-01-25 Deutsch Zentr Luft & Raumfahrt Rohrförmige luftdurchströmte Vorrichtung mit aktiver Schallreduktionseinrichtung
DE102009000494A1 (de) 2009-01-29 2010-09-30 Deutsches Zentrum für Luft- und Raumfahrt e.V. Schalldämpfer mit schraubenförmigem Gaskanal
US8312962B2 (en) 2009-02-05 2012-11-20 Deutsches Zentrum Fur Luft-Und Raumfahrt E.V. Sound absorber having helical fixtures

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE189988C (fr) *
CH313645A (de) 1952-12-22 1956-04-30 Passerini Pietro Schalldämpfungsvorrichtung für Explosionsmotoren
FR1149456A (fr) 1955-10-29 1957-12-26 Andre Boet Et Cie Perfectionnements aux silencieux, notamment pour moteurs à explosion
US2924296A (en) * 1957-07-25 1960-02-09 Clark Equipment Co Dry muffler and mounting means therefor
US3132717A (en) * 1955-05-27 1964-05-12 Bolt Beranek & Newman Acoustically absorbent conduit
DE1185021B (de) * 1955-05-11 1965-01-07 J R Andersson & Co A B Geraeuschdaempfer fuer stroemende Gase mit schallabsorbierenden Waenden

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE189988C (fr) *
CH313645A (de) 1952-12-22 1956-04-30 Passerini Pietro Schalldämpfungsvorrichtung für Explosionsmotoren
DE1185021B (de) * 1955-05-11 1965-01-07 J R Andersson & Co A B Geraeuschdaempfer fuer stroemende Gase mit schallabsorbierenden Waenden
US3132717A (en) * 1955-05-27 1964-05-12 Bolt Beranek & Newman Acoustically absorbent conduit
FR1149456A (fr) 1955-10-29 1957-12-26 Andre Boet Et Cie Perfectionnements aux silencieux, notamment pour moteurs à explosion
US2924296A (en) * 1957-07-25 1960-02-09 Clark Equipment Co Dry muffler and mounting means therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19932714A1 (de) * 1999-07-16 2001-01-25 Deutsch Zentr Luft & Raumfahrt Rohrförmige luftdurchströmte Vorrichtung mit aktiver Schallreduktionseinrichtung
DE19932714C2 (de) * 1999-07-16 2001-05-03 Deutsch Zentr Luft & Raumfahrt Rohrförmige luftdurchströmte Vorrichtung mit aktiver Schallreduktionseinrichtung
DE102009000494A1 (de) 2009-01-29 2010-09-30 Deutsches Zentrum für Luft- und Raumfahrt e.V. Schalldämpfer mit schraubenförmigem Gaskanal
US8312962B2 (en) 2009-02-05 2012-11-20 Deutsches Zentrum Fur Luft-Und Raumfahrt E.V. Sound absorber having helical fixtures

Also Published As

Publication number Publication date
DE29723969U1 (de) 1999-08-12
DE19644089A1 (de) 1998-05-14

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