JPH06264740A - Insulated exhaust pipe for engine - Google Patents

Insulated exhaust pipe for engine

Info

Publication number
JPH06264740A
JPH06264740A JP5544193A JP5544193A JPH06264740A JP H06264740 A JPH06264740 A JP H06264740A JP 5544193 A JP5544193 A JP 5544193A JP 5544193 A JP5544193 A JP 5544193A JP H06264740 A JPH06264740 A JP H06264740A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
pipe
exhaust
inner pipe
engine
walls
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
JP5544193A
Other languages
Japanese (ja)
Inventor
Yoneji Tanaka
米治 田中
Original Assignee
Tanaka Pipe:Kk
株式会社田中パイプ
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

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/14Exhaust 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 having thermal insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/14Exhaust 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 having thermal insulation
    • F01N13/141Double-walled exhaust pipes or housings

Abstract

PURPOSE: To improve the purification efficiency by swirling exhaust gas from respective groove-like walls and uniforming the harmful component density through the process of constituting an inner pipe by circumferentially lining a plurality of spirally extended groove-like walls, in an insulated exhaust pipe for an engine.
CONSTITUTION: An insulated exhaust pipe 3 is composed of an inner pipe 7 for communicating an exhaust manifold 2 with a catalytic converter 4, an outer pipe 8 for surrounding the inner pipe 7 and an insulating material 10 to be filled into a cylindrical clearance 9 formed between the inner and outer pipes 7, 8 except for both ends. Both ends of both pipes 7, 8 are respectively and closely joined with each other, and flanges 11, 12 are welded thereon. In the inner pipe 7, three lines of grooved-like walls 7a formed into an U shape in section, and whose recessed surface is turned inward are circumferentially lined, and the groove-like walls 7a are so formed into a spiral shape as to be twisted in the same direction. Thereby, exhaust gas to flow through the inner pipe 7 produces swirling flow, and its harmful component density is uniformed, so that the purification efficiency is enhanced.
COPYRIGHT: (C)1994,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、エンジン用断熱排気管に関し、特に、エンジンの排気マニホールドを排気浄化器に連通するインナパイプと、これを包容するアウタパイプとからなるものゝ改良に関する。 BACKGROUND OF THE INVENTION The present invention relates to a heat-insulating exhaust pipe for an engine, in particular, the inner pipe communicating the exhaust manifold of the engine to the exhaust purifier comprises one ゝ an improvement from the outer pipe to embrace this.

【0002】 [0002]

【従来の技術】かゝる断熱排気管は、例えば実公昭60 BACKGROUND OF THE INVENTION Such heat insulation exhaust pipe, for example the actual Publication 60
−29625号公報に開示されているように既に知られている。 It is already known as disclosed in -29625 JP.

【0003】 [0003]

【発明が解決しようとする課題】断熱排気管は、エンジンの排ガスを保温しつゝ排気浄化器に導き、排ガスに含まれるHC、CO、NOx等の有害成分を酸化又は還元により除去させるものであるが、排ガスの有害成分濃度が不均一であると、排気浄化器には部分的に大なる浄化負担が加わることになり、浄化効率及び耐久性の低下という不都合を招く。 [SUMMARY OF THE INVENTION adiabatic exhaust pipe leads to the exhaust gas of the engine to the thermal insulation quality ゝ exhaust purifier, as it can remove HC contained in the exhaust gas, CO, by oxidation or reduction of harmful components such as NOx the case, the harmful component concentration of the exhaust gas is not uniform, an exhaust purifier in part will be larger becomes purifying burden is applied to the leads the disadvantage that reduction of the purification efficiency and durability.

【0004】本発明は、かゝる事情に鑑みてなされたもので、排気浄化器に導入するエンジンの排ガスの有害成分濃度を均一化し、排気浄化器の浄化効率及び耐久性の向上に寄与し得る前記エンジン用断熱排気管を提供することを目的とする。 [0004] The present invention has been made in view of the mentioned circumstances, the harmful component concentration of the exhaust gas of the engine to be introduced into the exhaust purifier equalized, contributing to the improvement of the purification efficiency and durability of the exhaust gas purifier and to provide the engine heat-insulating exhaust pipe to obtain.

【0005】 [0005]

【課題を解決するための手段】上記目的を達成するために、本発明は、螺旋状に延びる複数条の溝状壁を周方向に連ねてインナパイプを構成したことを特徴とする。 To achieve the above object of the Invention The present invention is characterized by being configured the inner pipe lined with grooved walls of plural rows extending helically in the circumferential direction.

【0006】 [0006]

【実施例】以下、図面により本発明の一実施例について説明する。 BRIEF DESCRIPTION An embodiment of the present invention with reference to the drawings.

【0007】先ず、図1において、1は自動車用エンジンを示し、それの排気マニホールド2には、本発明の断熱排気管3を介して排気浄化器としての触媒コンバータ4が接続される。 [0007] First, in FIG. 1, 1 denotes an automobile engine, the exhaust manifold 2 of it, the catalytic converter 4 as an exhaust purifier is connected via a heat insulating exhaust pipe 3 of the present invention. 更に、この触媒コンバータ4には排気管5を介して消音器6が接続される。 Further, muffler 6 is connected through an exhaust pipe 5 to the catalytic converter 4.

【0008】図2及び図3に示すように、断熱排気管3 [0008] As shown in FIGS. 2 and 3, the heat insulating exhaust pipe 3
は、排気マニホールド2を触媒コンバータ4に連通するインナパイプ7と、このインナパイプ7を包容するアウタパイプ8と、両端部を除いてこれらインナ及びアウタパイプ7,8間に画成される筒状の空隙9に充填される断熱材10とから構成される。 Includes an inner pipe 7 for communicating the exhaust manifold 2 to the catalytic converter 4, the outer pipe 8 for encasing the inner pipe 7, a cylindrical gap is defined between these inner and outer pipe 7,8, except both end portions composed of heat insulating material 10 for being filled to 9. 両パイプ7,8の両端部は、それぞれ互いに密合されており、これらには排気マニホールド2及び触媒コンバータ4に接続するためのフランジ11,12が溶接される。 Both end portions of the pipes 7 and 8 are engaged respectively close to each other, these include a flange 11, 12 for connection to an exhaust manifold 2 and the catalytic converter 4 is welded.

【0009】前記インナパイプ7は、両端部を除いて、 [0009] The inner pipe 7, except for the both end portions,
凹面を内方へ向けた断面U字状の3条の溝状壁7a‥を周方向に連ねて構成され、しかも各溝状壁7aは同一方向に捩じれた螺旋状に形成される。 It consists of U-shaped section of Article groove wall 7a ‥ of having a concave surface facing inwardly lined in the circumferential direction, yet the groove walls 7a are formed spirally twisted in the same direction.

【0010】また前記アウタパイプ8も、両端部を除いて、凹面を内方へ向けた断面U字状の3条の溝状壁8a [0010] The outer pipe 8 also, except for the both end portions, of the U-shaped section 3 of Article having a concave surface facing inward groove wall 8a
‥を周方向に連ねて構成される。 Configured been chosen ‥ in the circumferential direction. このアウタパイプ8においても各溝状壁8aは同一方向に捩じれた螺旋状に形成されると共に、前記インナパイプ7の溝状壁7aと同一位相に配置される。 Also with each groove wall 8a is formed spirally twisted in the same direction in this outer pipe 8, it is arranged in a groove-like wall 7a and the same phase of the inner pipe 7. したがって、両パイプ7,8間の空隙9は各部一定となり、この空隙9を埋める前記断熱材10の肉厚も一定となる。 Therefore, the gap 9 between the pipes 7 and 8 becomes each unit constant, the thickness of the heat insulating material 10 to fill the gap 9 is also constant.

【0011】次にこの実施例の作用について説明する。 [0011] Next the operation of this embodiment will be described.

【0012】エンジン1の排ガスが排気マニホールド2 [0012] The exhaust gas of the engine 1 exhaust manifold 2
に排出されると、断熱排気管3により触媒コンバータ4 Once discharged, the catalytic converter 4 by heat insulating exhaust pipe 3
に導かれ、こゝで排ガス中の有害成分が酸化又は還元により除去された後、排気管5、消音器6を順次経て外部へ排出される。 It led, after harmful components in the exhaust gas at this ゝ has been removed by oxidation or reduction, and is discharged to the outside through the exhaust pipe 5, the muffler 6 sequentially.

【0013】ところで、断熱排気管3においては、インナパイプ7を構成する3条の溝状壁7a‥が螺旋状に捩じられているので、インナパイプ7内を流れる排ガスは、上記溝状壁7a‥の螺旋状凹面に誘導されて旋回流を生じ、これにより排ガスは攪拌され、その有害成分濃度が均一化する。 By the way, in the heat insulating exhaust pipe 3, since the groove walls 7a ‥ of Article 3 constituting the inner pipe 7 is twisted spirally, the exhaust gas flowing in the inner pipe 7, the groove wall is induced in the spiral concave 7a ‥ caused a swirling flow, thereby the exhaust gas is stirred, the harmful component concentration becomes uniform. しかも、排ガスの熱で加熱されたインナパイプ7は断熱材10及びアウタパイプ8により保温されるので、排ガスは大きく温度降下することなく触媒コンバータ4に導入される。 Moreover, the inner pipe 7 which is heated by the exhaust gas heat because it is kept warm by the heat insulating material 10 and the outer pipe 8, is introduced into the catalytic converter 4 without exhaust gas to increase the temperature drop. したがって、触媒コンバータ4では、その全域で排ガス中の有害成分を除去することになるから、浄化効率が高まり、しかも浄化負担が局部的に集中することもないことから、触媒コンバータの耐久性向上にも寄与し得る。 Thus, the catalytic converter 4, since will remove harmful components in the exhaust gas in the entire region, increased purification efficiency, moreover since the purifying burden not be locally concentrated, the durability of the catalytic converter It may also contribute.

【0014】図4は本発明の第2実施例を示すもので、 [0014] Figure 4 shows a second embodiment of the present invention,
アウタパイプ8を断面円形のパイプで作った点を除けば前実施例と同様の構成であり、図中、前実施例と対応する部分には、それと同一の符号を付す。 The outer pipe 8 has the same configuration as that of the previous embodiment except made with a circular section of the pipe, in the figure, the portions corresponding to the previous embodiment, the same the same reference numerals.

【0015】尚、上記実施例においては、本発明の要旨を逸脱することなく種々の設計変更が可能である。 [0015] In the above embodiment, and various design changes are possible without departing from the gist of the present invention. 例えば、インナパイプ7の溝状壁7aを3条以上の条数に変えることもできる。 For example, it is also possible to vary the groove walls 7a of the inner pipe 7 to the number of threads of 3 or more strips. また、イナン及びアウタパイプ7, In addition, Inan and the outer pipe 7,
8間の空隙9は、そこに断熱材を充填せず、断熱空隙とすることもできる。 Gap 9 between 8 therein without filling a heat insulating material may be a heat insulation air gap.

【0016】 [0016]

【発明の効果】以上のように本発明によれば、断熱排気管において、螺旋状に延びる複数条の溝状壁を周方向に連ねてインナパイプを構成したので、断熱排気管を通るエンジンの排ガスを各溝状壁により旋回させて、排ガス中の有害成分濃度を均一化させることができ、したがってこのような排ガスを導入した排気浄化器では、その全域で排ガス中の有害成分を除去することになるから浄化効率が高く、しかも浄化負担が広く分散することから排気浄化器の耐久性向上にも寄与する。 According to the present invention as described above, according to the present invention, in the adiabatic exhaust pipe, so to constitute a inner pipe lined with grooved walls of plural rows extending helically in the circumferential direction, of the engine through a heat insulating exhaust pipe the exhaust gas swirled by the respective groove-like walls, it is possible to equalize the harmful component concentration in the exhaust gas, therefore the exhaust purifier of introducing such an exhaust gas, the removal of harmful components in the exhaust gas in the entire region purification efficiency since become the high and contributes to durability of the exhaust gas purifier from the purifying burden is dispersed widely.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の第1実施例を示す自動車用エンジンの排気系の平面図。 Figure 1 is a plan view of an exhaust system of an automobile engine that shows the first embodiment of the present invention.

【図2】上記排気系における断熱排気管の拡大縦断面図。 Figure 2 is an enlarged longitudinal sectional view of the heat insulating exhaust pipe in the exhaust system.

【図3】図2の3−3線断面図。 [3] cross-sectional view taken along line 3-3 of FIG.

【図4】本発明の第2実施例を示す、図3に対応した断面図。 4 shows a second embodiment of the present invention, cross-sectional view corresponding to FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

1・・・・・エンジン 2・・・・・排気マニホールド 3・・・・・断熱排気管 4・・・・・排気浄化器としての触媒コンバータ 7・・・・・インナパイプ 7a・・・・溝状壁 8・・・・・アウタパイプ 1 ..... engine 2 ----- exhaust manifold 3 ----- catalytic converter 7 ----- inner pipe 7a · · · · as heat insulating exhaust pipe 4 ----- exhaust purifier groove-shaped wall 8 ..... outer pipe

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 エンジン(1)の排気マニホールド(2)を排気浄化器(4)に連通するインナパイプ(7)と、これを包容するアウタパイプ(8)とからなる、エンジン用断熱排気管において、 螺旋状に延びる複数条の溝状壁(7a)を周方向に連ねてインナパイプ(7)を構成したことを特徴とする、エンジン用断熱排気管。 And 1. A inner pipe communicating with the exhaust purifier (4) an exhaust manifold (2) of the engine (1) (7), consisting of a outer pipe (8) for encasing it, in the adiabatic exhaust pipe for an engine characterized by being configured the inner pipe (7) chosen plural rows of groove walls extending spirally (7a) in the circumferential direction, the heat insulating exhaust pipe for an engine.
JP5544193A 1993-03-16 1993-03-16 Insulated exhaust pipe for engine Pending JPH06264740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5544193A JPH06264740A (en) 1993-03-16 1993-03-16 Insulated exhaust pipe for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5544193A JPH06264740A (en) 1993-03-16 1993-03-16 Insulated exhaust pipe for engine

Publications (1)

Publication Number Publication Date
JPH06264740A true true JPH06264740A (en) 1994-09-20

Family

ID=12998688

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5544193A Pending JPH06264740A (en) 1993-03-16 1993-03-16 Insulated exhaust pipe for engine

Country Status (1)

Country Link
JP (1) JPH06264740A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728937A1 (en) * 1994-12-28 1996-07-05 Aisin Seiki gate valve structure for a turbocharger
WO2000012879A1 (en) * 1998-09-01 2000-03-09 Gerd Gaiser Exhaust gas purification device
JP2006009793A (en) * 2004-05-28 2006-01-12 Koichi Hatamura Exhaust pipe structure
US7175422B2 (en) 2001-08-06 2007-02-13 Southwest Research Institute Method for accelerated aging of catalytic converters incorporating injection of volatilized lubricant
US7212926B2 (en) 2002-08-06 2007-05-01 Southwest Research Institute Testing using a non-engine based test system and exhaust product comprising alternative fuel exhaust
US7277801B2 (en) 2001-08-06 2007-10-02 Southwest Research Institute Method for testing catalytic converter durability
US7299137B2 (en) 2002-08-06 2007-11-20 Southwest Research Institute Method for drive cycle simulation using non-engine based test system
FR2906302A1 (en) * 2006-09-22 2008-03-28 Faurecia Sys Echappement Exhaust gas purification unit for heat engine of motor vehicle, has inlet section with spiral ribs providing speed to gas along circumferential direction with respect to central line, and substrate with upstream face turned towards inlet
US7412335B2 (en) 2002-08-06 2008-08-12 Southwest Research Institute Component evaluations using non-engine based test system
US7741127B2 (en) 2001-08-06 2010-06-22 Southwest Research Institute Method for producing diesel exhaust with particulate material for testing diesel engine aftertreatment devices
CN102182537A (en) * 2011-05-06 2011-09-14 常州常瑞天力动力机械有限公司 Exhaust pipe of automobile
JP2018087509A (en) * 2016-11-28 2018-06-07 マツダ株式会社 Exhaust device of engine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2728937A1 (en) * 1994-12-28 1996-07-05 Aisin Seiki gate valve structure for a turbocharger
WO2000012879A1 (en) * 1998-09-01 2000-03-09 Gerd Gaiser Exhaust gas purification device
US7175422B2 (en) 2001-08-06 2007-02-13 Southwest Research Institute Method for accelerated aging of catalytic converters incorporating injection of volatilized lubricant
US7277801B2 (en) 2001-08-06 2007-10-02 Southwest Research Institute Method for testing catalytic converter durability
US7741127B2 (en) 2001-08-06 2010-06-22 Southwest Research Institute Method for producing diesel exhaust with particulate material for testing diesel engine aftertreatment devices
US7412335B2 (en) 2002-08-06 2008-08-12 Southwest Research Institute Component evaluations using non-engine based test system
US7212926B2 (en) 2002-08-06 2007-05-01 Southwest Research Institute Testing using a non-engine based test system and exhaust product comprising alternative fuel exhaust
US7299137B2 (en) 2002-08-06 2007-11-20 Southwest Research Institute Method for drive cycle simulation using non-engine based test system
JP2006009793A (en) * 2004-05-28 2006-01-12 Koichi Hatamura Exhaust pipe structure
FR2906302A1 (en) * 2006-09-22 2008-03-28 Faurecia Sys Echappement Exhaust gas purification unit for heat engine of motor vehicle, has inlet section with spiral ribs providing speed to gas along circumferential direction with respect to central line, and substrate with upstream face turned towards inlet
CN102182537A (en) * 2011-05-06 2011-09-14 常州常瑞天力动力机械有限公司 Exhaust pipe of automobile
JP2018087509A (en) * 2016-11-28 2018-06-07 マツダ株式会社 Exhaust device of engine

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