EP0229148B1 - Schalldämpfer - Google Patents

Schalldämpfer Download PDF

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Publication number
EP0229148B1
EP0229148B1 EP86904417A EP86904417A EP0229148B1 EP 0229148 B1 EP0229148 B1 EP 0229148B1 EP 86904417 A EP86904417 A EP 86904417A EP 86904417 A EP86904417 A EP 86904417A EP 0229148 B1 EP0229148 B1 EP 0229148B1
Authority
EP
European Patent Office
Prior art keywords
focusing point
silencer according
absorbing material
sound
sound absorbing
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
EP86904417A
Other languages
English (en)
French (fr)
Other versions
EP0229148A1 (de
Inventor
Tore Reinhardtsen
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
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 Individual filed Critical Individual
Priority to AT86904417T priority Critical patent/ATE40582T1/de
Publication of EP0229148A1 publication Critical patent/EP0229148A1/de
Application granted granted Critical
Publication of EP0229148B1 publication Critical patent/EP0229148B1/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
    • F01N1/08—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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/16—Chambers with particular shapes, e.g. spherical

Definitions

  • the present invention is concerned with a silencer, especially for muffling sound waves form combustion engines.
  • Silencers of the type described are known from DE-C-338 906 and NO-C-56 196.
  • the silencer according to the first mention patent comprises a house having two against eachother facing and to eachother connected parabolic hollow members where the exhaust gases are brought in near one or both focusing points. From the focusing point the sound waves will be reflected on the internal wall and deflected to parallel beams which at the opposite internal wall are deflected and directed against the second parabolic focusing point.
  • a dampening of the noice is aimed at by mixing and swirling of the sound beams, whereby an extension of the cross section area is present from the focusing points towards the middle of the device.
  • the known silencer has a comparatively complicated construction and an interference between different sound waves must be established to achieve effectivety.
  • Fig. 1 discloses a section I-I in Fig. 2
  • Fig. 2 discloses a section II-II in Fig. 1
  • Fig. 3 discloses a section corresponding to Fig. 2 of a second embodiment having another arrangement of the input
  • Fig. 4 discloses a section corresponding to Fig. 2 of a further embodiment of the invention
  • Fig. 5-7 are righthand use of the silencer on Fig. 2, disclosing different side wall designes
  • Fig. 8-11 are sections corresponding to Fig. 2 disclosing different designs of the top and bottom of the silencer according to the invention
  • Fig. 12 discloses a section according to Fig. 1 of a further embodiment of the silencer according to the invention.
  • the silencer according to the present invention comprises, as principally disclosed in Fig. 1, an input 1 for gases transmitting sound waves, an output 2 for the exhaust, a closed container comprising a top 7, a bottom 8 and a surrounding side wall 3, and a sound absorbing material 6.
  • the side wall 3 has the shape of an ellipses, whereby the input 1 terminates approximately at the first focusing point 4 and sound absorbing material is arranged on and around the second focusing point 5.
  • the combustion gases from a not shown combustion engine are brought into the container through the input 1 in such a way that the sound waves are dispersed substantially from the first focusing point 4 in all directions, thereby being reflected from the side wall 3 and directed against" the second focusing point 5 where the sound waves substantially are absorbed. Part of the sound waves is directed also straight forward from the input 1 and thereby being absorbed by the sound absorbing material 6 directly.
  • the input 1 may be arranged as disclosed in Fig. 2 or as disclosed in Fig. 3, in both cases however, the sound waves will enter the container substantially in the first focusing point 4.
  • the input 1 principally is a pipe extending through the side wall 3 and as far as to the first focusing point 4.
  • the input pipe can be drawn back as far as to the sidewall 3 without extending into the interior of the container. Principally this is disclosed in Fig. 3 where the input is terminated at the container wall, in this case the bottom 8.

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)

Claims (12)

1. Schalldämpfer, insbesondere zur Dämpfung von Schallwellen von Verbrennungsmotoren, gekennzeichnet durch einen geschlossenen Behälter bestehend aus einem Oberteil (7) und einem Unterteil (8) sowie einer den Oberteil und den Unterteil verbindenten Seitenwand (3) mit elliptischer Form im mittleren Längsschnitt zwischen Ober- und Unterteil, sowie durch einen Gaseinlaß (1), der die Geräusche annähernd auf einen ersten Brennpunkt (4) der Ellipse leitet, einen Auslaß (2) im Bereich des zweiten Brennpunktes (5) der Ellipse, und ein schallabsorbierendes Material (6), das sich zumindest im zweiten Brennpunkt (5) der Ellipse zwischen Oberteil und Unterteil erstreckt, welches schallabsorbierende Material (6) dadurch für eine wesentliche Absorbierung des Schalls eingerichtet ist.
2. Schalldämpfer nach Patentanspruch 1, dadurch gekennzeichnet, daß sowohl der Unterteil (8) als auch der Oberteil (7) flach ausgebildet und in einem Winkel zueinander angeordnet sind, wobei der gegenseitige Abstand von der Einlaßseite mit dem ersten Brennpunkt (4) zur Auslaßseite mit dem zweiten Brennpunkt (5) hin zunimmt.
3. Schalldämpfer nach Patentanspruch 1, dadurch gekennzeichnet, daß der Unterteil (8) und der Oberteil (7) flach ausgebildet und in einem Winkel zueinander angeordnet sind, wobei der gegenseitige Abstand von der Einlaßseite mit dem ersten Brennpunkt (4) zur Auslaßseite mit dem Zweiten Brennpunkt (5) hin abnimmt.
4. Schalldämpfer nach Patentanspruch 1, dadurch gekennzeichnet, daß der Unterteil (8) und der Oberteil (7) flach ausgebildet sind und parallel zueinander verlaufen.
5. Schalldämpfer nach Patentanspruch 1, dadurch gekennzeichnet, daß der Unterteil (8) und der Oberteil (7) einen zunehmenden Abstand von den Brennpunkten (4, 5) zur Mittelfläche zwischen den Brennpunkten hin aufweisen.
6. Schalldämpfer nach Patentanspruch 1, dadurch gekennzeichnet, daß der Unterteil (8) und der Oberteil (7) einen abnehmenden Abstand von den Brennpunkten (4, 5) zur Mittelfläche zwischen den Brennpunkten hin aufweisen.
7. Schalldämpfer nach einem der Patentansprüche 1 bis 6, gekennzeichnet durch einen schallabsorbierendes Material enthaltenden, auf dem Oberteil angeordneten Kasten (9) und eine Öffnung (10) im Oberteil beim zweiten Brennpunkt (5), wodurch das schallabsorbierende Material (6) beim zweiten Brennpunkt (5) mit dem schallabsorbierenden Material des Kastens (9) verbunden und die Gesamtmenge an schallabsorbierendem Material erhöht ist.
8. Schalldämpfer nach einem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, daß das schallabsorbierende Material (6) einen wesentlichen Teil des Behältervolumens einnimmt.
9. Schalldämpfer nach einem der Patentansprüche 1 bis 7, dadurch gekennzeichnet, daß das schallabsorbierende Material (6) um den zweiten Brennpunkt (5) herum zylindrische Form aufweist.
10. Schalldämpfer nach einem der Patentansprüche 1 bis 9, dadurch gekennzeichnet, daß die Seitenwände (3) zwischen Unterteil (8) und Oberteil (7) gerade verlaufen.
11. Schalldämpfer nach einem der Patentansprüche 1 bis 9, dadurch gekennzeichnet, daß die Seitenwände (3) zwischen Unterteil (8) und Oberteil (7) einen Teil eines Ellipsoids darstellen.
12. Schalldämpfer nach einem der Patentansprüche 1 bis 9, dadurch gekennzeichnet, daß die Seitenwände (3) von der mittleren Schnittebene des Behälters zum Unterteil (8) und zum Oberteil (9) hin konisch einwärts verlaufen.
EP86904417A 1985-06-27 1986-06-26 Schalldämpfer Expired EP0229148B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86904417T ATE40582T1 (de) 1985-06-27 1986-06-26 Schalldaempfer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO852587 1985-06-27
NO852587A NO156384C (no) 1985-06-27 1985-06-27 Lyddemper.

Publications (2)

Publication Number Publication Date
EP0229148A1 EP0229148A1 (de) 1987-07-22
EP0229148B1 true EP0229148B1 (de) 1989-02-01

Family

ID=19888363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904417A Expired EP0229148B1 (de) 1985-06-27 1986-06-26 Schalldämpfer

Country Status (6)

Country Link
EP (1) EP0229148B1 (de)
AT (1) ATE40582T1 (de)
AU (1) AU6120886A (de)
DE (1) DE3662010D1 (de)
NO (2) NO156384C (de)
WO (1) WO1987000241A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO873269L (no) * 1986-12-12 1988-06-13 Tore Reinhardtsen Lyddemper.
AU2018387880A1 (en) * 2017-12-18 2020-06-11 Nitto Kohki Co., Ltd. Fluid device and buffer tank for same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE338906C (de) * 1917-03-04 1921-06-15 Gottfried Begas Dipl Ing Auspuffschalldaempfer
NO56196C (de) * 1933-11-21
US4538701A (en) * 1982-07-19 1985-09-03 Tecumseh Products Company Muffler

Also Published As

Publication number Publication date
DE3662010D1 (en) 1989-03-09
ATE40582T1 (de) 1989-02-15
NO870802D0 (no) 1987-02-26
NO156384C (no) 1987-09-09
NO852587L (no) 1986-12-29
NO870802L (no) 1987-02-26
NO156384B (no) 1987-06-01
NO164935B (no) 1990-08-20
EP0229148A1 (de) 1987-07-22
AU6120886A (en) 1987-01-30
NO164935C (no) 1990-11-28
WO1987000241A1 (en) 1987-01-15

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