EP0029506B1 - Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes - Google Patents

Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes Download PDF

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Publication number
EP0029506B1
EP0029506B1 EP80106431A EP80106431A EP0029506B1 EP 0029506 B1 EP0029506 B1 EP 0029506B1 EP 80106431 A EP80106431 A EP 80106431A EP 80106431 A EP80106431 A EP 80106431A EP 0029506 B1 EP0029506 B1 EP 0029506B1
Authority
EP
European Patent Office
Prior art keywords
silators
waste gas
impedance
exhaust
noise
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
Application number
EP80106431A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029506A1 (de
Inventor
Oskar Dr. Bschorr
Eckehard Laudien
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of EP0029506A1 publication Critical patent/EP0029506A1/de
Application granted granted Critical
Publication of EP0029506B1 publication Critical patent/EP0029506B1/de
Expired 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • the invention relates to a device for reducing the exhaust or exhaust noise of hot and aggressive exhaust gases from internal combustion engines or thermodynamic systems by means of silators tuned to different frequencies.
  • silencers have been proposed in various forms to dampen the noise of exhaust or exhaust systems, but they are all based on the same relatively few basic principles, which are primarily absorption systems on open-pore materials, insulation by means of coordinated resonance volumes and impedance jumps. All of these known devices require relatively large designs and also these silencers are subject to very strong corrosion phenomena and the frequently occurring implementation of the absorption materials.
  • silators volume-changing resonators
  • the invention has for its object to provide a device of the type mentioned, which allows exhaust or exhaust systems to be reduced in volume, but to increase the muffler effect.
  • silators - Due to the proposed resonating resonators - which are referred to as silators - which are integrated with the exhaust gas channel, an impedance dip occurs in the region of their resonance frequency, which causes reflection. If several silators tuned to different frequencies are now arranged, broadband sound insulation is achieved in a simple manner. If the silators are now dampened, as provided by a preferred feature of the invention, they also absorb sound due to their resistance, and if the silator walls are provided with an anti-drumming coating, additional sound absorption takes place. In order to reduce the vibrating mass, it is advantageous if only the edge parts are provided with the covering. Of course, it is of course also possible to use the known method of using counter leaflets.
  • FIG. 1 and 1b show a schematic representation of sections through an exhaust or exhaust duct 1, which is provided with the silators 2 according to the proposal according to the invention. These are lenticular vacuum spaces made of sheet metal. Such silators are described in detail in DE-OS 2632290. Such elements have pronounced resonances, the impedances of which are below that of the air. Overall, this results in an impedance jump with an effective insulation effect. In order to make them broadband, several silators tuned to different frequencies are used. These are housed in a protective housing 4 and shielded against the exhaust duct 1 with metal wool 3. Instead of metal wool, other materials or perforated sheet metal can also be used.
  • FIG. 1 shows an analog design, consisting of exhaust duct 11, silators 12 and protective housing 14. Between the silators 12 there is a sound-permeable material 13, e.g. B. metal wool. The mode of operation is also the same as that described in FIG. 1.
  • FIG 3 again shows a longitudinal section through an exhaust duct 21 provided with a muffler, which in this case is divergent at its gas outlet in the direction of flow.
  • the silators 22 and 26 are seated, the former being dimensioned such that their impedance is smaller than the air impedance and the latter 26 are damped and approximately matched to the air impedance. This ensures optimal sound absorption.
  • the silators 22 and 26 are accommodated in a protective housing 24 which has an opening 25 on one side.
  • a perforated plate 23 is located between the exhaust duct 21 and the silators 22 and 26.
  • Fig. 4 shows an embodiment according to the invention, which is substantially analogous to that shown in Figs. 1a and 1.
  • Silators arranged on opposite sides. These are again in a protective housing and are separated from the exhaust duct by a sound-permeable material.
  • FIG. 1 shows an exemplary embodiment with damped silators 51. These have, preferably in the region of the exhaust gas jet, a damping coating or anti-drumming agent 52 which is covered by a contour plate 53. In order not to increase the resonating mass of the silators 51, this assignment is preferably located in the edge region of the silators 51. Due to this damping of the silators, they also absorb the sound due to their resistance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP80106431A 1979-11-23 1980-10-22 Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes Expired EP0029506B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2947256A DE2947256C2 (de) 1979-11-23 1979-11-23 Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes
DE2947256 1979-11-23

Publications (2)

Publication Number Publication Date
EP0029506A1 EP0029506A1 (de) 1981-06-03
EP0029506B1 true EP0029506B1 (de) 1983-09-07

Family

ID=6086711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106431A Expired EP0029506B1 (de) 1979-11-23 1980-10-22 Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes

Country Status (4)

Country Link
US (1) US4325458A (cg-RX-API-DMAC10.html)
EP (1) EP0029506B1 (cg-RX-API-DMAC10.html)
JP (1) JPS5685512A (cg-RX-API-DMAC10.html)
DE (1) DE2947256C2 (cg-RX-API-DMAC10.html)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5129793A (en) * 1990-10-24 1992-07-14 Copeland Corporation Suction muffler
US5267321A (en) * 1991-11-19 1993-11-30 Edwin Langberg Active sound absorber
US5341654A (en) * 1993-04-16 1994-08-30 Copeland Corporation Suction gas conduit
DE10102040A1 (de) * 2001-01-18 2002-07-25 Mahle Filtersysteme Gmbh Schalldämpfer

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904125A (en) * 1953-05-08 1959-09-15 Emhart Mfg Co Straight through silencer
CH436759A (de) * 1964-07-28 1967-05-31 Airtherm Consulting Ag Vorrichtung zur Schalldämpfung in von Gas durchströmten Kanälen mittels eines Membranschalldämpfers
JPS4937651U (cg-RX-API-DMAC10.html) * 1972-07-11 1974-04-03
DE7330817U (de) * 1973-07-13 1975-06-05 Bbc Ag Brown Boveri & Cie Absorptionsschalldämpfer
US3920095A (en) * 1974-02-01 1975-11-18 Brunswick Corp Free flow sound attenuating device and method of using
DE2433795C3 (de) * 1974-07-13 1980-12-18 Oskar Dipl.-Ing. Dr.Rer.Nat. 8000 Muenchen Bschorr Zwei- oder mehrschalige Hohlwand zur Abschirmung von Störschallquellen
CH581261A5 (en) * 1974-08-15 1976-10-29 Bernard Robert IC engine exhaust gas silencer - with gases passing through two concentric insulated chambers and entering Venturi at throat
FR2288858A1 (fr) * 1974-10-24 1976-05-21 Plessy Fernand Silencieux pour moteurs
FR2321590A2 (fr) * 1975-08-22 1977-03-18 Plessy Fernand Perfectionnements aux silencieux pour moteur
US4104426A (en) * 1975-11-28 1978-08-01 Mcdonnell Douglas Corporation Production of muffler material
DE2632290C3 (de) * 1976-07-17 1980-02-14 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Schallreduktion durch mitschwingende Resonatoren
DE2834823C2 (de) * 1978-08-09 1980-07-17 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Volumenändernde Resonatoren nach dem Tellerfeder-Prinzip
US4228869A (en) * 1976-07-17 1980-10-21 Messerschmitt-Bolkow-Blohm Gmbh Variable volume resonators using the Belleville spring principle

Also Published As

Publication number Publication date
EP0029506A1 (de) 1981-06-03
US4325458A (en) 1982-04-20
DE2947256A1 (de) 1981-05-27
DE2947256C2 (de) 1984-09-13
JPH0152563B2 (cg-RX-API-DMAC10.html) 1989-11-09
JPS5685512A (en) 1981-07-11

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