EP0271465A2 - Silencieux - Google Patents

Silencieux Download PDF

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Publication number
EP0271465A2
EP0271465A2 EP87850384A EP87850384A EP0271465A2 EP 0271465 A2 EP0271465 A2 EP 0271465A2 EP 87850384 A EP87850384 A EP 87850384A EP 87850384 A EP87850384 A EP 87850384A EP 0271465 A2 EP0271465 A2 EP 0271465A2
Authority
EP
European Patent Office
Prior art keywords
silencer
focusing point
sound
wall
absorbing material
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.)
Withdrawn
Application number
EP87850384A
Other languages
German (de)
English (en)
Other versions
EP0271465A3 (fr
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
Priority claimed from NO865041A external-priority patent/NO865041D0/no
Application filed by Individual filed Critical Individual
Publication of EP0271465A2 publication Critical patent/EP0271465A2/fr
Publication of EP0271465A3 publication Critical patent/EP0271465A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention is related to a silencer accord­ing to the preamble of the claims.
  • Silencers of different designs are known especially in connection with muffling of sound waves from combustion engines, also ellipsoidic or elliptic silencers where the sound is liberated in one focusing point of the ellipsis and upon reflection is focused in the second focusing point where the substantial part of the sound is absorbed by a sound absorbing material.
  • Fig. 1 discloses a longitudinal sect­ion through the silencer in a plane having an elliptic outer shape
  • Fig. 2-8 disclose different embodiments of the cross section of the silencer from a revolution body in Fig. 2, to a disc shape in Fig. 4-8
  • Fig. 9-13 disclose different embodiments of the silencer in a longitudinal section perpen­dicular to the section in Fig. 1
  • Fig. 14 discloses a section corresponding to Fig. 9-13, of a further embodiment, compris­ing a container in the first focusing point, filled with sound absorbing material
  • Fig. 15 discloses a section corre­sponding to Fig. 9-13 of an embodiment comprising another arrangement of the introduction pipe
  • Fig. 1 discloses a longitudinal sect­ion through the silencer in a plane having an elliptic outer shape
  • Fig. 2-8 disclose different embodiments of the cross section of the silencer from a revolution body in Fig. 2, to a disc shape in Fig. 4-8
  • Fig. 16 discloses a section corresponding to Fig. 1 of a further embodiment of the invention, where the sound absorbing material is arranged in an extension of the introduction pipe
  • Fig. 17 discloses a section corresponding to Fig. 1, of an embodiment comprising a silencer being cut in the first focusing point
  • Fig. 18 discloses an embodiment of the silencer where the two focusing points are overlapping
  • Fig. 19 discloses a section corre­sponding to Gi. 4-8, where the upper and lower sides of the silencer are concave.
  • the silencer according to the invention has an ellip­tical wall 3 in longitudinal section, as disclosed in Fig. 1.
  • the silencer furthermore comprises an introduction pipe 1 terminating substantially in one of the focusing points of the ellipsis, whereas the output pipe 2 preferably is arranged in the opposite end of the silencer, for the exhaust of gases.
  • the silencer in Fig. 1 may have the shape of an ellip­soid with a circular cross section as disclosed in Fig. 2, an elliptical section as disclosed in Fig. 3, or a disc form as disclosed in Fig. 4-8.
  • the elliptic wall 3 of the silencer may have inwardly from the mid plane bevelled end walls in both sides as disclosed in Fig. 5, one end wall 3 as disclosed in Fig. 4 where the disc shaped silencer is a disc of the ellipsoid in Fig. 2.
  • the silencer in Fig. 6 substantially corresponds to the silencer in Fig. 4, the three transitions of the end walls to the surfaces 6 of the disc, thereby being rounded.
  • the silencer comprises cylind­ric walls 3 in an elliptic shape and flat upper and lower surfaces 6, whereas Fig. 8 discloses a corresponding embodi­ment, however with rounded transitions between the end wall 3 and the surfaces 6 of the disc.
  • Fig. 19 discloses a silencer comprising a substantially rectangular cross section, the upper and lower surfaces 6, however being concave.
  • Fig. 9-13 disclose different embodiments of the silen­cer in an longitudinal section perpendicularly to the section in Fig. 1.
  • Fig. 9 and 10 disclose the silencer having against each other sloping upper and lower surfaces 6, Fig. 9 thereby having the largest distance between upper and lower surfaces at the introduction pipe and Fig. 10 the opposite shape.
  • Fig. 11 and 12 disclose silencers where the upper and lower surfaces 6 have the same distance at the introducton and the exhaust pipes, but where the distance between them is larger in Fig. 11 and less in Fig. 12.
  • Fig. 13 discloses a silencer having parallel upper and lower surfaces 6.
  • Fig. 14 discloses a silencer corresponding to Fig. 13, but where a box 9 is arranged on the silencer, near the first focusing point 8, comprising an aperture 5 between the box and the internal of the silencer, substantially in the first focusing point 8.
  • the box 9 is filled with sound absorbing material 10.
  • Fig. 15 discloses the introduction pipe 1 arranged in the first focusing point 8 perpendicularly to the longi­tudinal axes of the silencer and Fig. 16 discloses a silencer where a box 11 is arranged as an extension of the introduction pipe 1 and which is filled with sound absorbing material 12.
  • Fig. 17 discloses embodiment where the introduction pipe 1 for the sound, terminates at the first focusing point 8.
  • the rear part of the ellipsis here is replaced with a wall 11 from the edge of the introduction pipe to the circum­ference of the ellipsis. According to the wave theory, the sound waves will follow this edge, however not be reflected from it. With such a wall 11 more sound waves can be reflected to the first focusing point 8.
  • the wall 11 should be straight or slightly curved as disclosed in the Figure.
  • the cross section of the wall may have a shape as described above.
  • Fig. 18 discloses a special embodiment of the elliptical silencer where the two focusing points overlap and where the sound waves therefore are reflected directly back to the first focusing point.
  • the sound waves will propagate from the first focusing point 8 against the wall 3 of the silencer and on this way move through the sound absorbing material 4 which is dampening part of the sound, whereas the rest of the sound waves will be reflected from the wall 3 and focused to the second focusing point 7 to continue against the opposite wall 3 and thereafter being reflected to the first focusing point 8.
  • the sound waves grately will propagate back to the sound source through the introduction pipe.
  • the sound waves being focused therefore may be absorbed by the sound absorbing material 4 in the silencer itself, or by means of resonance dampening by means of the box 9 filled with sound absorbing material 10, as disclosed in Fig. 14.
  • the reflected sound waves are absorbed by the sound absorbing material 12 in a separate dampening means, namely the box 11 being arranged on the introduction pipe upstreams the elliptic silencer.
  • the sound absorbing material may be arranged any place in the silencer and the muffling thereby will increase with the amount of material.
  • the exhause pipe of the silencer may be arranged anywhere however not in the focusing point 7 or 8. An arrange­ment as disclosed in the drawing probably will give the best result.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP87850384A 1986-12-12 1987-12-11 Silencieux Withdrawn EP0271465A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO865041 1986-12-12
NO865041A NO865041D0 (no) 1986-12-12 1986-12-12 Lyddemper.
NO873269 1987-08-05
NO873269A NO873269L (no) 1986-12-12 1987-08-05 Lyddemper.

Publications (2)

Publication Number Publication Date
EP0271465A2 true EP0271465A2 (fr) 1988-06-15
EP0271465A3 EP0271465A3 (fr) 1990-02-14

Family

ID=26647993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850384A Withdrawn EP0271465A3 (fr) 1986-12-12 1987-12-11 Silencieux

Country Status (2)

Country Link
EP (1) EP0271465A3 (fr)
NO (1) NO873269L (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL53952C (fr) * 1900-01-01
FR992706A (fr) * 1944-08-09 1951-10-22 Sival Soc Perfectionnements apportés aux dispositifs extincteurs d'un bruit se propageant dans un fluide en écoulement, notamment aux silencieux pour moteurs à combustion interne et armes à feu
DE891343C (de) * 1950-12-01 1953-09-28 Karl Dr-Ing Habil Goesele Anordnung zur Unterdrueckung von Durchlass-Resonanzen bei Rohrstuecken
WO1987000241A1 (fr) * 1985-06-27 1987-01-15 Tore Reinhardtsen Silencieux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL53952C (fr) * 1900-01-01
FR992706A (fr) * 1944-08-09 1951-10-22 Sival Soc Perfectionnements apportés aux dispositifs extincteurs d'un bruit se propageant dans un fluide en écoulement, notamment aux silencieux pour moteurs à combustion interne et armes à feu
DE891343C (de) * 1950-12-01 1953-09-28 Karl Dr-Ing Habil Goesele Anordnung zur Unterdrueckung von Durchlass-Resonanzen bei Rohrstuecken
WO1987000241A1 (fr) * 1985-06-27 1987-01-15 Tore Reinhardtsen Silencieux

Also Published As

Publication number Publication date
EP0271465A3 (fr) 1990-02-14
NO873269D0 (no) 1987-08-05
NO873269L (no) 1988-06-13

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