EP0396753A1 - Dämpfvorrichtung für auspuffgas - Google Patents

Dämpfvorrichtung für auspuffgas Download PDF

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Publication number
EP0396753A1
EP0396753A1 EP89903246A EP89903246A EP0396753A1 EP 0396753 A1 EP0396753 A1 EP 0396753A1 EP 89903246 A EP89903246 A EP 89903246A EP 89903246 A EP89903246 A EP 89903246A EP 0396753 A1 EP0396753 A1 EP 0396753A1
Authority
EP
European Patent Office
Prior art keywords
muffler
carbon fibers
bulky
cylindrical body
resins
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Withdrawn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
EP89903246A
Other languages
English (en)
French (fr)
Other versions
EP0396753A4 (en
Inventor
Hideo Yoshikawa
Katsuyoshi Takeuchi
Hiromi Ishikawa
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.)
YOSHIKAWA Hideo
Yamato Co Ltd
Eneos Corp
Original Assignee
YOSHIKAWA Hideo
Nippon Petrochemicals Co Ltd
Yamato Co 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 YOSHIKAWA Hideo, Nippon Petrochemicals Co Ltd, Yamato Co Ltd filed Critical YOSHIKAWA Hideo
Publication of EP0396753A1 publication Critical patent/EP0396753A1/de
Publication of EP0396753A4 publication Critical patent/EP0396753A4/en
Withdrawn legal-status Critical Current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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/16—Selection of particular 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
    • 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
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using 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
    • F01N2310/00—Selection of sound absorbing or insulating material

Definitions

  • the present invention relates to a muffler for exhaust combustion gas noise and particularly to an exhaust muffler to be mounted to internal combustion engines such as automobiles and motorbikes, jet engines, or gas turbines to attenuate exhaust gas noise while allowing the exhaust gas from any such engine to pass therethrough, or an exhaust muffler for boilers or combustors such as those for heating or cooling.
  • the outer shell of a muffler is constituted using a synthetic resin which exhibits a noise attenuating effect in place of a metallic material.
  • Resins reinforced with fibers such as carbon fibers and glass fibers are exemplified therein.
  • synthetic resins involve problems; for example, they are not proof against the high temperature of exhaust gas and the connection thereof with mirror plates is difficult.
  • the present invention relates to a muffler for exhaust combustion gas noise which has a cylindrical body, an inlet pipe and an outlet pipe and in which the interior of the said cylindrical body is filled with bulky, accumulated carbon fibers, or such accumulated carbon fibers are mounted to the cylindrical body interior.
  • the cylindrical body, inlet pipe and outlet pipe which constitute the muffler of the present invention may be of known shapes and structures. If desired, the muffler of the invention may be further provided with a partition plate and a conduit, or resonance holes may be formed in the inlet, outlet pipes and the conduit.
  • accumulated carbon fibers to be filled or mounted in the muffler of the present invention there are included mat- and felt-like shapes, fabrics and three-dimensional fabrics.
  • the bulky, accumulated carbon fibers used in the present invention have a bulk density in the range of 0.001 to 0.20 g/cm3.
  • the "bulk density” as referred to herein indicates a bulk density of the said accumulated carbon fibers when mounted or filled in the interior of the muffler body. If the bulk density is lower than 0.001 g/cm 3 , there will not be obtained a satisfactory muffling effect, and if the bulk density is higher than 0.20 g/cm 3 , the amount of fuel consumed will be increased due to pressure loss although there will be obtained a satisfactory muffling effect.
  • a particularly preferred bulk density range is 0.02 to 0. 20 g /cm 3 .
  • carbon fibers to be used for obtaining the bulky, accumulated carbon fibers in the present invention there may be used any of rayon-, polyacrylonitrile-, petroleum pitch- and coal pitch-based carbon fibers, but pitch-based carbon fibers are particularly effective.
  • length of the carbon fibers there may be used any of short, medium and long carbon fibers. These carbon fibers are characteristic in that they are superior in the resistance to heat and to acids and low in thermal conductivity.
  • carbon fibers as used herein is a generic term for carbon fibers and graphite fibers.
  • the method for obtaining the bulky, accumulated carbon fibers used in the present invention is not specially limited. There may be used any conventional method; for example, a method in which raw carbon fibers are accumulated and needle-punched, a method in which accumulated pitch fibers obtained by fiberizing and deposition from molten pitch according to a vortex method are rendered infusible and then carbonized, a method in which carbon fibers are subjected to a paper making process, or a method in which those products obtained are further subjected to needle punching. Also employable is a product obtained by impregnating the accumulated carbon fibers with a heat- carbonizable synthetic resin and then heat-treating the thus- impregnated carbon fibers to carbonize the synthetic resin. This product is improved in strength, shape retaining property, deterioration-dissipation preventing property and heat resistance.
  • the bulky, accumulated carbon fibers used in the present invention may be a mixture of carbon fibers and organic or inorganic carbon fibers. By using this mixture there can be attained improvement of strength andvshape; retaining property.
  • inorganic fibers there is no special limitation. For example, there may be used boron fibers, silicon carbide fibers, alumina fibers, silicone titanium carbon oxide fibers and amorphous fibers. In the case where organic fibers are used, it is preferable for the improvement of heat resistance that the organic fibers be heat-carbonized after the mixing.
  • the method for filling the interior of the cylindrical body with the bulky, accumulated carbon fibers or mounting the latter to the cylindrical body interior may be done suitably for the interior space of the muffler.
  • the bulky, accumulated carbon fibers may be mounted to suitable portions(s), preferably at least one of the inner wall of the cylindrical body, the outer and inner surfaces of a conduit and the surface of a partition plate.
  • thermoplastic and thermosetting resins are employable.
  • a heat-resisting resin exhibits a noise absorbing effect particularly in a viscoelastic region not lower than its glass transition point, and a liquid crystal polymer has an extremely high heat deformation temperature, which is not lower than 300°C, and thus superior particularly in heat resistance.
  • additives may be incorporated in the heat-resisting resin.
  • additives there is no special limitation.
  • the muffler of the present invention exhibits the following functions and effects.
  • the crystal-noncrystal combination of each individual carbon fiber is in conformity with exhaust combustion gas conditions. More particularly, the crystal and noncrystal textures constituting each carbon fiber correspond to a spring having elasticity and a dash pot having viscoelasticity, respectively, functioning as a whole as a viscous damping oscillation system, and this system resonates with the frequency of exhaust combustion gas such as the exhaust gas from an engine.
  • the present invention is characteristic in that an outstanding effect is exhibited under the temperature condition of exhaust combustion gas.
  • the kinds of mufflers were produced as working examples by mounting ceramic paper as lining 5 to the inner surface of a cylindrical body 1 having such a sectional structure as shown in Fig. 1 and formed using a heat-resisting resin (a phenolic resin) and filling a chamber 6 in the cylindrical body 1 with a petroleum pitch-based carbon fiber felt at different bulk densities. Also produced were a muffler not filled with any filler and a muffler filled with rock wool as comparative examples. These mufflers were tested for noise muffling effects.
  • Fig. 4 shows the relation between the engine speed (rpm) and a total noise level (db(A)) observed at a constant engine output of 15 kw.
  • Fig. 4 1 shows the result obtained using the muffler not filled with any filler; 0, 3 and 4 show the results obtained using the mufflers filled with the bulky, accumulated carbon fibers at bulk densities of 0.035, 0.53 and 0.070 (g/cm 3 ), respectively; and 5 shows the results obtained using the muffler filled with 0.15 g/cm of rock wool.
  • the ese mufflers were each subjected to frequency analysis to check the relation between frequency and noise level. The results are as shown in Fig. 5.
  • the muffler 1 which is a working example of the present invention is low in noise level and superior in noise muffling effect as compared with the conventional examples 2 and 3.
  • a carbon felt 11 (10 mm thick) was mounted three rolls in thickness of 30 mm (tatal weight: 265 g) to the inner surface of cylindrical body 1 having such a sectional structure as shown in Fig. 6 and formed of a liquid crystal polyester "XYDAR" (trade name, a product of Amoco Performance Products, Inc., U.S.A.) reinforced with glass fibers.
  • XYDAR liquid crystal polyester
  • This muffler was mounted to a 1.5L, 4-cylinder, 4- cycle, gasoline engine and the relation between the engine speed (rpm) and a total noise level (db(A)) was checked in the same manner as in Run 1 at a constant engine output of 22 kw. The results are as shown in Fig. 7.
  • a muffler was produced and test was conducted in the same manner as in Run 3 except that the cylindrical body 1 was replaced by a cylindrical body formed of a liquid crystal polyester "XYDAR" (trade name, a product of Amoco Performance Products, Inc., U.S.A.). The results are as shown in Fig. 7.
  • XYDAR liquid crystal polyester
  • this muffler was checked for noise muffling effect using an FFT analyzer in the same manner as in Run 2. The results are as shown in Fig. 7.
EP19890903246 1988-07-28 1989-03-01 Silencer for combustion exhaust gas Withdrawn EP0396753A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18673488A JPH0237105A (ja) 1988-07-28 1988-07-28 燃焼排気ガス騒音用消音器
JP186734/88 1988-07-28

Publications (2)

Publication Number Publication Date
EP0396753A1 true EP0396753A1 (de) 1990-11-14
EP0396753A4 EP0396753A4 (en) 1991-03-27

Family

ID=16193713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890903246 Withdrawn EP0396753A4 (en) 1988-07-28 1989-03-01 Silencer for combustion exhaust gas

Country Status (4)

Country Link
EP (1) EP0396753A4 (de)
JP (1) JPH0237105A (de)
BE (1) BE1002925A3 (de)
WO (1) WO1990001109A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394451A1 (de) * 1988-07-15 1990-10-31 Nippon Petrochemicals Company, Limited Dämpfervorrichtung
EP0626505A2 (de) * 1993-04-28 1994-11-30 YOSHIKAWA, Hideo Denitrierender Schalldämpfer und modifizierte Kohlenstofffasern oder -partikel hierfür
WO2007117701A3 (en) * 2006-04-12 2007-11-22 Owens Corning Fiberglas Tech Long fiber thermoplastic composite muffler system
WO2008073137A1 (en) * 2006-12-14 2008-06-19 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated reflective chamber
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
WO2012149537A1 (en) * 2011-04-29 2012-11-01 E. I. Du Pont De Nemours And Company Muffler assembly with mounting adapter(s) and process of manufacture
US8424636B2 (en) 2011-04-29 2013-04-23 E.I. Du Pont De Nemours And Company Muffler assembly and process of manufacture
US8505682B2 (en) 2011-04-29 2013-08-13 E I Du Pont De Nemours And Company Lightweight polymeric exhaust components
EP3034666A1 (de) * 2014-12-17 2016-06-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dämm- und filterstoff und seine verwendung als inertes schallabsorbierendes material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040657A1 (de) * 1980-05-27 1981-12-02 Carl Matthews Vorrichtung und Verfahren zur Schalldämpfung und Auspuffsysteme und Rohre für Klima- oder Heizungsanlagen, welche diese Vorrichtung enthalten
JPS5712815A (en) * 1980-06-27 1982-01-22 Shigetaro Yamaoka Cleaner for exhaust gas from discharge type mimeographic plate making
GB2143902A (en) * 1983-01-20 1985-02-20 Honda Motor Co Ltd Heat and sound insulating apparatus
EP0146249A2 (de) * 1983-11-18 1985-06-26 TBA Industrial Products Limited Glasfaserprodukte
US4589516A (en) * 1984-02-20 1986-05-20 Honda Giken Kogyo Kabushiki Kaisha Muffler for internal combustion engines
WO1988002695A1 (en) * 1986-10-14 1988-04-21 The Dow Chemical Company Sound and thermal insulation
EP0269116A2 (de) * 1986-11-26 1988-06-01 Showa Denko Kabushiki Kaisha Abgasschalldämpfer aus Harz für Brennkraftmaschinen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62182420A (ja) * 1986-02-06 1987-08-10 Daiwa Kogyo Kk 焼結式排気消音器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040657A1 (de) * 1980-05-27 1981-12-02 Carl Matthews Vorrichtung und Verfahren zur Schalldämpfung und Auspuffsysteme und Rohre für Klima- oder Heizungsanlagen, welche diese Vorrichtung enthalten
JPS5712815A (en) * 1980-06-27 1982-01-22 Shigetaro Yamaoka Cleaner for exhaust gas from discharge type mimeographic plate making
GB2143902A (en) * 1983-01-20 1985-02-20 Honda Motor Co Ltd Heat and sound insulating apparatus
EP0146249A2 (de) * 1983-11-18 1985-06-26 TBA Industrial Products Limited Glasfaserprodukte
US4589516A (en) * 1984-02-20 1986-05-20 Honda Giken Kogyo Kabushiki Kaisha Muffler for internal combustion engines
WO1988002695A1 (en) * 1986-10-14 1988-04-21 The Dow Chemical Company Sound and thermal insulation
EP0269116A2 (de) * 1986-11-26 1988-06-01 Showa Denko Kabushiki Kaisha Abgasschalldämpfer aus Harz für Brennkraftmaschinen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 78 (C-102)() 15 May 1982, & JP-A-57 12815 (YAMAOKA SHIGETARO) 22 January 1982, *
See also references of WO9001109A1 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0394451A1 (de) * 1988-07-15 1990-10-31 Nippon Petrochemicals Company, Limited Dämpfervorrichtung
EP0394451A4 (en) * 1988-07-15 1991-12-11 Nippon Petrochemicals Company, Limited Muffler
EP0626505A2 (de) * 1993-04-28 1994-11-30 YOSHIKAWA, Hideo Denitrierender Schalldämpfer und modifizierte Kohlenstofffasern oder -partikel hierfür
EP0626505A3 (de) * 1993-04-28 1995-03-08 Hideo Yoshikawa Denitrierender Schalldämpfer und modifizierte Kohlenstofffasern oder -partikel hierfür.
US7730996B2 (en) 2006-04-12 2010-06-08 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated crash management
WO2007117701A3 (en) * 2006-04-12 2007-11-22 Owens Corning Fiberglas Tech Long fiber thermoplastic composite muffler system
CN101460714B (zh) * 2006-04-12 2011-06-08 Ocv智识资本有限责任公司 长纤维热塑性复合材料的消声器系统
WO2008073137A1 (en) * 2006-12-14 2008-06-19 Ocv Intellectual Capital, Llc Long fiber thermoplastic composite muffler system with integrated reflective chamber
CN101578430B (zh) * 2006-12-14 2011-10-12 Ocv智识资本有限责任公司 具有一体的反射腔的长纤维热塑复合消声器系统
WO2012149537A1 (en) * 2011-04-29 2012-11-01 E. I. Du Pont De Nemours And Company Muffler assembly with mounting adapter(s) and process of manufacture
US8424636B2 (en) 2011-04-29 2013-04-23 E.I. Du Pont De Nemours And Company Muffler assembly and process of manufacture
US8505682B2 (en) 2011-04-29 2013-08-13 E I Du Pont De Nemours And Company Lightweight polymeric exhaust components
EP3034666A1 (de) * 2014-12-17 2016-06-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dämm- und filterstoff und seine verwendung als inertes schallabsorbierendes material

Also Published As

Publication number Publication date
JPH0237105A (ja) 1990-02-07
WO1990001109A1 (en) 1990-02-08
BE1002925A3 (fr) 1991-08-20
EP0396753A4 (en) 1991-03-27

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