WO2020217862A1 - Structure de réduction du bruit pour tuyaux d'échappement - Google Patents

Structure de réduction du bruit pour tuyaux d'échappement Download PDF

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Publication number
WO2020217862A1
WO2020217862A1 PCT/JP2020/014391 JP2020014391W WO2020217862A1 WO 2020217862 A1 WO2020217862 A1 WO 2020217862A1 JP 2020014391 W JP2020014391 W JP 2020014391W WO 2020217862 A1 WO2020217862 A1 WO 2020217862A1
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WO
WIPO (PCT)
Prior art keywords
inorganic
molded body
glass fiber
thickness
fiber molded
Prior art date
Application number
PCT/JP2020/014391
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English (en)
Japanese (ja)
Inventor
森川　修
森　正
馬渕　知樹
Original Assignee
ニチアス株式会社
トヨタ自動車株式会社
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Publication date
Application filed by ニチアス株式会社, トヨタ自動車株式会社 filed Critical ニチアス株式会社
Publication of WO2020217862A1 publication Critical patent/WO2020217862A1/fr

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    • 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 (1) A sound reduction structure for an exhaust pipe having an inorganic fiber-containing mat arranged between the inner pipe and the outer pipe of an automobile exhaust pipe having a coaxial double cylindrical structure of an inner pipe and an outer pipe.
  • the inorganic fiber-containing mat has an inorganic binder dispersed in a base material made of an inorganic fiber molded body, and has a ventilation resistance of 1.8 to 2 on one side main surface of the base material made of the glass fiber molded body. It has an inorganic porous film of .6 kPa ⁇ s / m and has.
  • the base material made of the glass fiber molded body is made of an inorganic fiber needle processed product in which the ratio of the needle processed holes having a hole diameter of 0.05 to 0.70 mm to all the needle processed holes on the surface is 80 to 100%.
  • the inorganic fiber-containing mat is converted into a solid content, 0.5 to 5.0% by mass of the inorganic binder is dispersed in 95.0 to 99.5% by mass of the base material made of the inorganic fiber molded body.
  • a sound-reducing structure for an exhaust pipe characterized in that the surface provided with the inorganic porous film is arranged so as to face the inner pipe and has a thickness of 5 to 30 mm.
  • Examples of the inorganic fiber constituting the inorganic fiber molded body include one or more selected from glass fiber, silica fiber, alumina fiber, silica alumina fiber, rock wool, basalt fiber, zirconia fiber and the like, which are economical and available. Glass fiber is preferable in consideration of ease of use and the like.
  • the hole diameter of the needle-processed hole provided on the surface of the inorganic fiber-containing molded body is determined from the tomographic photograph of the hole measured by an X-ray CT device (Skyscan1272 Micro-CT manufactured by BRUKER).
  • an X-ray CT device Skyscan1272 Micro-CT manufactured by BRUKER.
  • the aeration resistance of the inorganic porous membrane is adjusted so that the inorganic fiber molded body coated with the inorganic binder has a thickness of 15 mm and a bulk density of 130 kg / m 3, and then the aeration specified in JIS L1096.
  • the flow resistance of the air flow rate when air is passed from the coated surface side in the direction perpendicular to the main surface of the inorganic fiber molded body at a differential pressure of 0.125 kPa It means the one measured by a measuring instrument (manufactured by Kato Tech Co., Ltd., product name: KES-F8-AP1) and converted into airflow resistance.
  • Inorganic fiber-containing mats with an inorganic porous film on one side are considered to have Helmfortz-type film vibration (resonance) characteristics, and Masaru Koyasu (Theory of Sound Insulation / Absorption Materials and Composite Materials, Journal of the Japan Society for Composite Materials, No. Based on the report of Vol. 2, No. 4 (1976)), the maximum value (structural resonance frequency) f 0 of the resonance frequency of the sound absorption performance of the inorganic fiber-containing mat according to the present invention can also be expressed by the following equation (1). Conceivable.
  • a bentonite-containing film (thickness 0.2 mm, pore size 0.5%, aeration resistance 2.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side as the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, forming 3 kPa ⁇ s / m and a bentonite content of 100% by mass).
  • a bentonite-containing film (thickness 0.2 mm, pore size 0.6%, ventilation resistance 1.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, forming 75 kPa ⁇ s / m and having a bentonite content of 100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4).
  • a bentonite-containing film (thickness 0.19 mm, pore size 0.55%, ventilation resistance 2.) was formed on the inner main surface of the glass fiber molded body by winding it in a cylindrical shape with the inner peripheral surface side and then drying it.
  • a glass fiber-containing mat (thickness 10 mm, inner diameter 40 mm, outer diameter 60 mm) having a cylindrical shape as a whole was obtained, which formed 05 kPa ⁇ s / m and had a bentonite content of 100% by mass).
  • (4) Filling Step of Glass Fiber-Containing Mat Using the glass fiber-containing mat obtained in (3) above, the glass fiber-containing mat is combined with the inner tube 2 and the outer tube 3 in the same manner as in Example 1 (4).
  • the ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface (95%) was obtained. Further, when a plurality of the above-mentioned glass fiber molded bodies were laminated and pressurized, and the ventilation resistance was measured at a thickness of 15 mm and a bulk density of 130 kg / m 3 , it was 1.0 kPa ⁇ s / m.
  • Impregnation Step of Inorganic Binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.
  • the ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface (95%) was obtained. Further, when a plurality of the above-mentioned glass fiber molded bodies were laminated and pressurized, and the ventilation resistance was measured at a thickness of 15 mm and a bulk density of 130 kg / m 3 , it was 1.0 kPa ⁇ s / m.
  • Impregnation Step of Inorganic Binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.
  • the ratio of needle-machined holes with a hole diameter of 0.05 to 0.70 mm to the total needle-machined holes on the surface (95%) was obtained. Further, when the above-mentioned glass fiber molded products were laminated and pressurized, and the ventilation resistance was measured at a thickness of 15 mm and a bulk density of 130 kg / m 3 , it was 1.0 kPa ⁇ s / m.
  • Impregnation Step of Inorganic Binder The glass fiber molded body having a thickness of 6 mm is impregnated with an aqueous dispersion having a bentonite content of 2.5% by mass and squeezed with a felt roller to convert the impregnation amount into solid content.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne une nouvelle structure de réduction de bruit pour tuyaux d'échappement qui offre une performance de réduction de bruit suffisante, en particulier pour un son basse fréquence ne dépassant pas 1 kHz, même lorsque la structure est mince.　La structure de réduction de bruit pour tuyaux d'échappement comporte : un coussinet composé de fibres inorganiques ; un corps moulé en fibre inorganique en tant que matériau de base ; et est disposé entre un tuyau interne et un tuyau externe. Le coussinet contenant des fibres inorganiques comprend : une quantité prescrite de liant inorganique dispersé à l'intérieur d'un corps moulé à base de fibres inorganiques comprenant une pièce d'aiguille en fibre inorganique munie d'un trou de traitement d'aiguille déterminé ; et une membrane poreuse inorganique présentant une résistance à la ventilation déterminée, sur une surface principale sur un côté. La structure de réduction de bruit pour tuyaux d'échappement est caractérisée en ce qu'elle présente une épaisseur de 5 à 30 mm et en ce que la surface sur laquelle la membrane poreuse inorganique est prévue est disposée de manière à faire face au tuyau interne.
PCT/JP2020/014391 2019-04-26 2020-03-27 Structure de réduction du bruit pour tuyaux d'échappement WO2020217862A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-086046 2019-04-26
JP2019086046A JP6831422B2 (ja) 2019-04-26 2019-04-26 排気管用減音構造体

Publications (1)

Publication Number Publication Date
WO2020217862A1 true WO2020217862A1 (fr) 2020-10-29

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PCT/JP2020/014391 WO2020217862A1 (fr) 2019-04-26 2020-03-27 Structure de réduction du bruit pour tuyaux d'échappement

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JP (1) JP6831422B2 (fr)
WO (1) WO2020217862A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7127894B1 (ja) 2021-03-08 2022-08-30 中川産業株式会社 車両用マフラーの製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090272600A1 (en) * 2008-04-30 2009-11-05 Ibiden Co., Ltd. Mat member, method for manufacturing the mat member, muffler and method for manufacturing the muffler
JP2018028314A (ja) * 2016-08-12 2018-02-22 ニチアス株式会社 吸音構造体および吸音構造体の製造方法
WO2018174180A1 (fr) * 2017-03-24 2018-09-27 イビデン株式会社 Matériau isophonique et composant de véhicule

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090272600A1 (en) * 2008-04-30 2009-11-05 Ibiden Co., Ltd. Mat member, method for manufacturing the mat member, muffler and method for manufacturing the muffler
JP2018028314A (ja) * 2016-08-12 2018-02-22 ニチアス株式会社 吸音構造体および吸音構造体の製造方法
WO2018174180A1 (fr) * 2017-03-24 2018-09-27 イビデン株式会社 Matériau isophonique et composant de véhicule

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JP2020180604A (ja) 2020-11-05
JP6831422B2 (ja) 2021-02-17

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