EP0151507A1 - Auspuffanlage - Google Patents

Auspuffanlage Download PDF

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Publication number
EP0151507A1
EP0151507A1 EP85300041A EP85300041A EP0151507A1 EP 0151507 A1 EP0151507 A1 EP 0151507A1 EP 85300041 A EP85300041 A EP 85300041A EP 85300041 A EP85300041 A EP 85300041A EP 0151507 A1 EP0151507 A1 EP 0151507A1
Authority
EP
European Patent Office
Prior art keywords
silencer
core
notches
openings
silencer according
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.)
Granted
Application number
EP85300041A
Other languages
English (en)
French (fr)
Other versions
EP0151507B1 (de
Inventor
Richard Dehane Schultz
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.)
Exhaust International Pty Ltd
Original Assignee
GILMAN Pty Ltd
Exhaust International Pty Ltd
GILMAN Pty Ltd
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 GILMAN Pty Ltd, Exhaust International Pty Ltd, GILMAN Pty Ltd filed Critical GILMAN Pty Ltd
Priority to AT85300041T priority Critical patent/ATE39543T1/de
Publication of EP0151507A1 publication Critical patent/EP0151507A1/de
Application granted granted Critical
Publication of EP0151507B1 publication Critical patent/EP0151507B1/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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • 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
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
    • 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
    • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2470/00—Structure or shape of exhaust gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow

Definitions

  • This invention relates to an exhaust system and in particular to an absorbtion type silencer for an exhaust system.
  • Absorbtion type silencers which comprise a cylindrical body having a plurality of holes, the space between th.e outside of the body and the inside of the cover containing sound absorption material such as a glass or ceramic fibres.
  • .It is an object of the present invention to provide an arrangement which is more effective in absorbing exhaust noise.
  • a silencer includes a cylindrical body including a plurality of open notches in its surface.
  • the notches may be of any shape, but are preferably cut transversely and a curved portion pressed into the surface to constitute a downwardly-depending lip.
  • the curved portion may be directed forwardly or rearwardly.
  • the notches constitute less than 30 percent of the surface area and are arranged in the form of a number of spirals longitudinally of the body. They are grouped together so that longitudinally adjacent notches are of the order of 10 mm apart. This arrangement ensures that portions of wavelengths or groups of wavelengths of sound are collected by at least one or a group of notches, whence the waves pass into the sound absorbing material to be absorbed in part and, in some and often most cases, become out of phase when reflected back into the body, thereby attenuating or altering the wave pattern of incoming waves. Attenuation also results from the inertia of the gas in the notches.
  • the spiral formation also causes a reduction in turburlence at high gas velocities.
  • the silencer of the invention may be used as such but it is preferred, particularly for. high volumes of exhaust to provide a secondary silencer compartment, which is preferably located on the downstream side of the silencer as described above.
  • this secondary silencer includes a core located centrally in a cover, the cover terminating in a curved formation, the core having two portions, the first portion including openings flanking the second portion, and the second portion having rearwardly (having regard to the flow of exhaust gas) facing openings flanking the first portion.
  • the end of the second portion may be fixed in the curved termination of the cover. In this manner, the gases issuing from the first portion pass the second portion and are reflected by the curved termination, and then enter the rearwardly facing openings of the second portion for passage to atmosphere.
  • the openings are 'formed by pinching (without altering the effective cross-sectional area) the ends of adjacent cylindrical bodies and then joining the bodies with the resulting openings located in opposite directions and at right angles to each other.
  • a plate may separate the first absorbtion type silencer compartment with the second.
  • Sound waves entering the second compartment will be diverted by the first openings and will be reflected by the curved termination (which may be convex or concave).
  • the reflected waves will serve to attenuate forward moving waves both as regards angle and phase. Further loss of wave intensity occurs by viscosity and friction loss, and still further attenuation occurs by reason of transfer of wave energy through the diaphragm or plate separating the compartments.
  • the second portion of the core of the second compartment includes a plurality of holes which serve to bleed off excess pressure in the plenum section of the silencer and also to assist in the attenuation of sound waves.
  • the absorbtion type silencer is combined with a reverse type silencer, the latter being indicated by the reference 10 while the resonance type silencer is indicated by the reference 20.
  • the resonance type section of the combined silencer comprises a core 22 which is housed in a shell 26, the space between the core and the shell being filled with suitable sound absorbing material such as glass or ceramic fibres.
  • the essence of the invention is the provision of open notches 24 in the wall of the core 22, the notches being formed by making a transverse cut 27 and pressing out downwardly depending lips 28, thereby forming a series of openings to the incoming wave forms.
  • the physical laws governing sound waves apply and the similarity to wind musical instruments is apparent.
  • certain wave forms will pass through one or more of the notches depending on the distance of the particular notch or group of notches from the opening of the core. These waves are then attenuated in the sound absorbing material, and the wave form returning to the core will be out of phase when the distance between notches is an appreciable fraction of the wavelength, thus serving to attenutate other wave forms having common characteristics.
  • downwardly depending lips may be pressed down on the downstream side of the transverse cut.
  • Holes placed at small fractions of a wavelength behave as a single hole at a single point but more efficiently.
  • the notches also behave as side branches, not only orifices, as due to the forming action they have an effective depth. The presence of this depth causes the acoustic impedance at the junction to differ from the characteristic for plane waves in a pipe, and consequently a reflected wave is produced. A portion of the incident acoustic energy is also transmitted into and dissipated in this branch. Both these factors contribute to a reduction in acoustic energy transmitted through the portion of the pipe lying behind the branch or branches.
  • the notches are preferably arranged spirally as described above.
  • the absorbtion type silencer section is followed by a reverse type section 10 which comprises a pair of cylindrical portions 12,14 the meeting ends of which are pinched as shown and overlap as shown, slots having been provided for this purpose.
  • a plurality of holes may be provided in the cylindrical portions 12,14.
  • the shell 30 (which may be integral with shell 26) of the reverse type silencer section has curved termination 32, formed by pinching the end of the cylinder forming it. The end of portion 14 extending through the orifice 34 in the shell 30.
  • the pinching of the portions 12,14 results in the formation of openings 16 in portion 12 and 18 on portion 14, these openings flanking the respective portions.
  • the exhaust gases and sound waves entering this section of the combined silencer have two routes - a first route through the centre of the two portions where the pinching causes the formation of a restriction in the form of a cross and a second route through the flanking openings from where the gases and the sound waves impinge on the curved termiation 32. It will be appreciated that shapes other than a cross may be formed depending on the alteration of the cross-section.
  • the restriction also causes a reduction in sound energy by altering the impedance of the system.
  • the reflected gases and sound waves then move rearwardly from a number of different points on the curved termination, some of the gases finding their way through the openings 18 and thence to atmosphere.
  • the reflected sound waves attenuate some of the incoming sound waves, and others impinge on the diaphragm 40 between the two sections of the combined silencer, and are transmitted through the diaphragm to this section in which they are damped by the absorbtion medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Valve Device For Special Equipments (AREA)
EP85300041A 1984-01-04 1985-01-03 Auspuffanlage Expired EP0151507B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85300041T ATE39543T1 (de) 1984-01-04 1985-01-03 Auspuffanlage.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA840050 1984-01-04
ZA8450 1984-01-04

Publications (2)

Publication Number Publication Date
EP0151507A1 true EP0151507A1 (de) 1985-08-14
EP0151507B1 EP0151507B1 (de) 1988-12-28

Family

ID=25577089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85300041A Expired EP0151507B1 (de) 1984-01-04 1985-01-03 Auspuffanlage

Country Status (4)

Country Link
EP (1) EP0151507B1 (de)
JP (1) JPS60228718A (de)
AT (1) ATE39543T1 (de)
DE (1) DE3567060D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032117A1 (en) * 1996-03-01 1997-09-04 Murray James Kite Emission control and/or silencer and/or separator and/or mixing apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62152016U (de) * 1986-03-18 1987-09-26
CN121127167A (zh) * 2023-10-30 2025-12-12 夏普株式会社 送风结构以及具备该送风结构的电动吸尘器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49204E (fr) * 1937-07-31 1938-12-07 Perfectionnements apportés à la construction de silencieux pour moteurs à explosion et analogues
US4140204A (en) * 1977-08-01 1979-02-20 Gator Products, Inc. Two-tube muffler and method of manufacture
US4184565A (en) * 1978-12-15 1980-01-22 Harris V C Exhaust muffler
US4278147A (en) * 1979-02-08 1981-07-14 Kawasaki Jukogyo Kabushiki Kaisha Muffler for engine, particularly motorcycle engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR49204E (fr) * 1937-07-31 1938-12-07 Perfectionnements apportés à la construction de silencieux pour moteurs à explosion et analogues
US4140204A (en) * 1977-08-01 1979-02-20 Gator Products, Inc. Two-tube muffler and method of manufacture
US4184565A (en) * 1978-12-15 1980-01-22 Harris V C Exhaust muffler
US4278147A (en) * 1979-02-08 1981-07-14 Kawasaki Jukogyo Kabushiki Kaisha Muffler for engine, particularly motorcycle engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997032117A1 (en) * 1996-03-01 1997-09-04 Murray James Kite Emission control and/or silencer and/or separator and/or mixing apparatus

Also Published As

Publication number Publication date
EP0151507B1 (de) 1988-12-28
JPS60228718A (ja) 1985-11-14
DE3567060D1 (en) 1989-02-02
ATE39543T1 (de) 1989-01-15

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