EP3636909A1 - Vorrichtung zur lärmreduzierung für einspeiseleitung eines wärmeverbrennungsmotors, der mit einem turbokompressor ausgestattet ist - Google Patents

Vorrichtung zur lärmreduzierung für einspeiseleitung eines wärmeverbrennungsmotors, der mit einem turbokompressor ausgestattet ist Download PDF

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Publication number
EP3636909A1
EP3636909A1 EP19197918.6A EP19197918A EP3636909A1 EP 3636909 A1 EP3636909 A1 EP 3636909A1 EP 19197918 A EP19197918 A EP 19197918A EP 3636909 A1 EP3636909 A1 EP 3636909A1
Authority
EP
European Patent Office
Prior art keywords
attenuation device
acoustic
acoustic attenuation
absorption element
fibers
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.)
Pending
Application number
EP19197918.6A
Other languages
English (en)
French (fr)
Inventor
Thomas JEAN
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.)
Novares France SAS
Original Assignee
Novares France SAS
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 Novares France SAS filed Critical Novares France SAS
Publication of EP3636909A1 publication Critical patent/EP3636909A1/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
    • F02M35/1266—Intake silencers ; Sound modulation, transmission or amplification using resonance comprising multiple chambers or compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9023—Fibrous materials

Definitions

  • the present invention relates to an acoustic attenuation device for an intake line of a thermal combustion engine equipped with one or more turbochargers.
  • Internal combustion engines have a low frequency acoustic component ranging from 30Hz to 1kHz. This component is generated by the opening and closing of the valves, as well as by the resonance of the different engine cavities (combustion chambers, ducts, ).
  • turbocharged engines there is a high frequency acoustic component ranging from 800 Hz to 15 kHz. This acoustic component is generated by the turbocharger and can propagate and radiate through the air intake ducts.
  • an acoustic attenuation device using open cavities on a main duct in which the gaseous fluid circulates.
  • These open cavities can be completely or partially filled with a porous or fibrous material so as to modify the noise attenuation characteristics of the cavities. Since these cavities are open, the porous or fibrous material which it contains is subjected to the flow of gaseous fluid circulating in the main conduit. It can therefore deteriorate over time due to the eroding effect of the gaseous fluid.
  • the solution envisaged so far to avoid this deterioration consists in using materials which are more resistant to erosion. In particular, materials of the metallic foam type prove to be particularly effective at this level. However, these materials have the disadvantage of being expensive and of having a relatively low sound absorption power.
  • the object of the invention is to propose a device for attenuating noise, which makes it possible to effectively attenuate the noise propagated in the air intake ducts while limiting the cost of manufacturing said ducts.
  • the acoustic attenuation device of the invention makes it possible to separate the interior space of the peripheral chamber, in which the sound absorption element is housed, from the interior space of the duct, in which the fluid circulates. gaseous.
  • the sound absorption element is therefore no longer in contact with the gaseous fluid. This results in less erosion, which allows the use of fibrous or porous material which is less expensive and which has a sound absorption capacity greater than that of materials of the metallic foam type.
  • the invention relates to an air intake assembly for a vehicle, comprising a turbocharger having an air inlet and an air outlet and an acoustic attenuation device as described above.
  • the acoustic attenuation device is positioned upstream of the turbocharger.
  • FIG. 1 With reference to the figure 1 there is shown a known configuration of an acoustic attenuation device for an intake line of a thermal combustion engine equipped with a turbocharger.
  • This device 1 comprises in particular a main conduit 2 through which the air or the gas mixture circulates in the direction of circulation S, said conduit 2 extending along a direction axis ZZ '.
  • the duct 2 has a substantially cylindrical geometry. It is defined by a peripheral wall 3 having an internal diameter D1.
  • the peripheral wall 3 is provided with a through opening 4, said through opening 4 opening into a peripheral chamber 5 of annular shape.
  • the peripheral chamber 5 is delimited by the internal walls of a bell 6 of cylindrical shape which is arranged coaxially around the duct 2 so as to completely cover the through opening 4.
  • the bell 6 is notably defined by an external diameter D2 and a length L.
  • FIG 2 With reference to the figure 2 there is shown another known configuration of an acoustic attenuation device for an intake line of a thermal combustion engine equipped with a turbocharger.
  • This device 1 'differs from the device 1 shown in the figure 1 by the presence of a partition wall 7 at the level of the through opening 4.
  • This partition wall 7 is formed by a strip of porous materials arranged in the extension of the peripheral wall 3 so as to close the peripheral chamber 5.
  • the constituent strip of the wall 7 has a certain permeability, in particular between 650 l / m 2 / s and 1200 l / m 2 / s, and is generally made up of a textile made of polymer fibers or metallic fibers. The wall 7 thus ensures a flow that is substantially free of pressure drop while allowing acoustic attenuation.
  • an acoustic attenuation device 10 differs from the device 1 'shown in the figure 2 by the presence of an element of sound absorption 8 inside the peripheral chamber 5.
  • the sound absorption element 8 has an annular profile and partially fills, in particular half, the peripheral chamber 5. It can advantageously be fixed on the bell 6 , for example by welding or by clipping, so as to leave a free space between the partition wall 7 and the sound absorption element 8.
  • the sound absorption element 8 could advantageously be formed from a material chosen from among polymer foams, in particular polyurethane foams or polyurethane foams covered with a laminated film of polypropylene or polyethylene, the foams preferably having a density of between 8 and 55 kg / m 3 , or among the materials comprising polymer fibers, in particular comprising 30% polypropylene fibers and 70% polyethylene fibers.
  • Example 1 corresponds to the configuration shown on the figure 1 , in which the diameter D1 is 56 mm, the diameter D2 is 90 mm and the length L is 90 mm.
  • Example 2 corresponds to the configuration shown on the figure 2 , in which the diameter D1 is 56 mm, the diameter D2 is 90 mm and the length L is 90 mm, and in which the partition wall 7 is formed in a textile material made of polymer fibers comprising 30% of polypropylene fibers and 70% polyethylene fibers and has a permeability of 850 l / m 2 / s.
  • Example 3 corresponds to the configuration shown on the figure 3 , in which the diameter D1 is 56 mm, the diameter D2 is 90 mm and the length L is 90 mm, in which the partition wall 7 is formed in a textile material made of polymer fibers comprising 30% of polypropylene fibers and 70% polyethylene fiber and has a permeability of 850 l / m 2 / s and in which the sound absorption element 8 is formed from a material of open-cell trenched polyurethane foam covered with a laminated film of polypropylene or polyethylene and having a density of 25 kg / m 3 .
  • the sound absorption element 8 is arranged in such a way that the laminated film is directed towards the main duct 2. It can therefore be seen that the sound attenuation of the device of example 3 is at least 5 dB higher than that devices of examples 1 and 2, in particular in the frequency range between 1500 and 2500 Hz, which corresponds to the frequencies generally associated with turbocharged engines.
  • an acoustic attenuation device 11 according to a second embodiment of the invention.
  • This device 11 differs from the device 10 shown in the figure 3 in that the sound absorption element 8 completely fills the peripheral chamber 5, so that the sound absorption element 8 and the partition wall 7 are in contact.
  • FIG 9 With reference to the figure 9 there is shown a graph making it possible to compare the acoustic performances of the device 11 according to the invention with those of the device 1 of the prior art and of the device 10 according to the invention.
  • Examples 1 and 3 correspond to those defined above for the figure 8 and example 4 corresponds to the configuration shown on the figure 4 , in which the diameter D1 is 56 mm, the diameter D2 is 90 mm and the length L is 90 mm, in which the partition wall 7 is formed in a textile material made of polymer fibers comprising 30% of polypropylene fibers and 70% polyethylene fiber and has a permeability of 850 l / m 2 / s and in which the sound absorption element 8 is formed from a polyurethane foam material.
  • the acoustic attenuation of the device of Example 4 is greater than that of the devices of Examples 1 and 3 in the frequency range between 2000 and 2500 Hz.
  • the device of Example 4 can therefore be used preferentially in the event that the frequencies emitted by the turbocharged engine fall within this specific range.
  • the sound absorption element 8 is formed from a material comprising polypropylene fibers and polyethylene fibers, preferably in the proportion of 30% of polypropylene fibers and 70% of polyethylene fibers. This type of material has the advantage of being easily compressible, as illustrated on the figure 7 .
  • the device 12 shown in the figure 5 differs from the device 10 shown in the figure 3 by the fact that the sound absorption element 8 comprises a first part 81 and a second part 82 contiguous to the first part 81.
  • the first and second parts 81, 82 both have an annular shape defined by an external diameter d1, respectively d2, and an internal diameter d1 ', respectively d2'.
  • the external diameters d1 and d2 are equal, while the internal diameter d1 'of the first part 81 is greater than the internal diameter d2' of the second part 82, so that, in the first part 81, a space free is present between the partition wall 7 and the sound absorption element 8 and, in the second part 82, the sound absorption element 8 and the partition wall 7 are in contact.
  • This device 12 will therefore have different acoustic attenuation characteristics from those of the device 10.
  • the device 13 shown in the figure 6 differs from the device 10 shown in the figure 3 by the fact that the sound absorption element 8 has an annular shape defined by a constant external diameter d and an internal diameter continuously decreasing along its length, according to the direction of circulation S, so that, at at least a first end, the sound absorption element 8 and the partition wall 7 are in contact, and, at at least one second end, a free space is present between the partition wall 7 and the element acoustic absorption 8.
  • This device 13 will therefore have different acoustic attenuation characteristics from those of device 10.
  • the device 14 shown in the figure 7 differs from the device 10 shown in the figure 3 by the fact that the bell 6 has an increasing section in the direction of circulation S, the external diameter D2 increasing in stages.
  • the sound absorption element 8 also has an increasing section in the direction of circulation S so as to completely fill the peripheral chamber 5. It has in particular three contiguous parts 83, 84 and 85, whose internal diameters d3 ′, d4 'and d5' are equal and whose external diameters d3, d4 and d5 are defined by the relation d3 ⁇ d4 ⁇ d5.
  • This device 14 will therefore have different acoustic attenuation characteristics from those of the device 10.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP19197918.6A 2018-10-08 2019-09-18 Vorrichtung zur lärmreduzierung für einspeiseleitung eines wärmeverbrennungsmotors, der mit einem turbokompressor ausgestattet ist Pending EP3636909A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1859280A FR3086978B1 (fr) 2018-10-08 2018-10-08 Dispositif d'attenuation acoustique pour une ligne d'admission d'un moteur a combustion thermique equipee d'un turbocompresseur

Publications (1)

Publication Number Publication Date
EP3636909A1 true EP3636909A1 (de) 2020-04-15

Family

ID=65244165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19197918.6A Pending EP3636909A1 (de) 2018-10-08 2019-09-18 Vorrichtung zur lärmreduzierung für einspeiseleitung eines wärmeverbrennungsmotors, der mit einem turbokompressor ausgestattet ist

Country Status (2)

Country Link
EP (1) EP3636909A1 (de)
FR (1) FR3086978B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350223A (en) * 1980-01-16 1982-09-21 Nissan Motor Co., Ltd. Silencer
FR2551501A1 (fr) * 1983-08-31 1985-03-08 Nissan Motor Dispositif d'admission pour un moteur automobile a combustion interne
WO1997009527A1 (de) * 1995-09-05 1997-03-13 Woco Franz-Josef Wolf & Co. Schalldämpfer
EP1255071A1 (de) * 2001-05-04 2002-11-06 Mecaplast Sam Schalldämmungsanordnung in einem Kreislauf eines Gasfluidums
EP1780398A1 (de) * 2005-10-25 2007-05-02 Hutchinson Ansaugschalldämpfer für einer Brennkraftmaschine mit Turbolader
WO2017068264A1 (fr) * 2015-10-19 2017-04-27 Mecaplast France Dispositif d'atténuation acoustique pour une ligne d'admission

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350223A (en) * 1980-01-16 1982-09-21 Nissan Motor Co., Ltd. Silencer
FR2551501A1 (fr) * 1983-08-31 1985-03-08 Nissan Motor Dispositif d'admission pour un moteur automobile a combustion interne
WO1997009527A1 (de) * 1995-09-05 1997-03-13 Woco Franz-Josef Wolf & Co. Schalldämpfer
EP1255071A1 (de) * 2001-05-04 2002-11-06 Mecaplast Sam Schalldämmungsanordnung in einem Kreislauf eines Gasfluidums
FR2824383A1 (fr) 2001-05-04 2002-11-08 Mecaplast Sa Dispositif d'attenuation du niveau sonore d'un circuit de fluide gazeux
EP1780398A1 (de) * 2005-10-25 2007-05-02 Hutchinson Ansaugschalldämpfer für einer Brennkraftmaschine mit Turbolader
WO2017068264A1 (fr) * 2015-10-19 2017-04-27 Mecaplast France Dispositif d'atténuation acoustique pour une ligne d'admission

Also Published As

Publication number Publication date
FR3086978A1 (fr) 2020-04-10
FR3086978B1 (fr) 2020-10-23

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