JP4236879B2 - EGR gas cooling device - Google Patents

EGR gas cooling device Download PDF

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Publication number
JP4236879B2
JP4236879B2 JP2002210406A JP2002210406A JP4236879B2 JP 4236879 B2 JP4236879 B2 JP 4236879B2 JP 2002210406 A JP2002210406 A JP 2002210406A JP 2002210406 A JP2002210406 A JP 2002210406A JP 4236879 B2 JP4236879 B2 JP 4236879B2
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Prior art keywords
pipe
egr
egr gas
cooling device
egr pipe
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JP2004053107A (en
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孝彦 内藤
尚矢 久保田
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Sankei Giken Kogyo Co Ltd
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Sankei Giken Kogyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Description

【０００１】
【発明の属する技術分野】
本発明は、自動車等のエンジンの排気系から排出された排気ガスの一部をＥＧＲガスとしてエンジンの吸気系に再循環させるいわゆるＥＧＲガスの冷却装置に関する。
【０００２】
【従来の技術】
従来、上記のようなエンジンから排出される排気ガス中の窒素酸化物を低減させる等の目的で、エンジンの排気系から排出される排気ガスの一部をＥＧＲガスとしてエンジンの吸気系に再循環させるいわゆる排気ガス再循環（ＥＧＲ）装置を設けることは知られている。この場合、吸気系に再循環させるＥＧＲガスは、適度に冷却する必要があり、従来はＥＧＲ配管の途中に冷却手段を備えたＥＧＲガス冷却装置を設けるようにしている。
【０００３】
上記のようなＥＧＲガス冷却装置としては、例えば特開平１１−１９３９９２号や特開平１１−１９３９９３号公報に開示されているように、ＥＧＲガスを流通させるＥＧＲ配管を多数の管材で構成し、それらを覆う外管と上記ＥＧＲ配管との間に冷却水を流通させて上記ＥＧＲガスを冷却するものが知られているが、構造が複雑で製造コストが嵩み、また装置が大型化して車載重量が増大する等の問題がある。
【０００４】
そこで、例えば特開２００１−２０７９１９のようにＥＧＲ配管の外周に冷却水を流通させる筒状の外側水冷ジャケットを設けると共に、上記ＥＧＲ配管内に細い管状の内側水冷ジャケットを設けることが提案されている。しかしながら、ＥＧＲ配管内に細い管状の内側水冷ジャケットを設けるのは、煩雑かつ面倒で製作コストが嵩む等の不具合がある。
【０００５】
また例えば特開２０００−２６５９０８のようにＥＧＲ配管を単管とし、そのＥＧＲ配管の外周に冷却水を流通させる冷却管（外管）を設けると共に、上記ＥＧＲ配管の周方向複数箇所に軸線方向に延びる凹部を形成することによって上記ＥＧＲ配管を横断面波状に形成し、それによってＥＧＲ配管の表面積を増大させて冷却効率を高めるが提案されているが、上記のＥＧＲ配管内を流れるＥＧＲガスは単にそのまま通過するだけなので、必ずしも充分な冷却効果が得られない等の問題があった。
【０００６】
【発明が解決しようとする課題】
本発明は上記の問題点に鑑みて提案されたもので、簡単な構成により、冷却効果の優れたＥＧＲガス冷却装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記の目的を達成するために本発明によるＥＧＲガス冷却装置は、以下の構成としたものである。即ち、エンジンの排気系から排出された排気ガスの一部をＥＧＲガスとしてエンジンの吸気系に再循環させるＥＧＲ配管の外周に外管を設け、その外管とＥＧＲ配管との間に冷却水を流通させて上記ＥＧＲ配管内を通るＥＧＲガスを冷却するＥＧＲガス冷却装置において、上記外管内のＥＧＲ配管に、該ＥＧＲ配管の両端部よりも大径の直管状または紡錘形状の膨出部と、その膨出部よりも小径の狭窄部とを設け、その狭窄部として上記ＥＧＲ配管の両端部と略同径で該ＥＧＲ配管の内方に突出するリング状の突出部を設けたことを特徴とする。なお、上記ＥＧＲ配管の狭窄部には、必要に応じて多数の小突起を設けるようにしてもよい。
【０００９】
【発明の実施の形態】
以下、本発明によるＥＧＲガス冷却装置を図に示す実施形態に基づいて具体的に説明する。
【００１０】
図１は本発明によるＥＧＲガス冷却装置の一実施形態を示すもので、図において、１はＥＧＲ配管で、その一端側はフランジ継手２および図に省略した接続管等を介してエンジンの排気マニホールド等に連通接続され、他端はフランジ継手３および図に省略した接続管等を介してエンジンの吸気マニホールド等に連通接続されている。
【００１１】
上記ＥＧＲ配管１は、本実施形態においては、その中間部にハイドロフォーム加工等により両端部１ａ，１ｂよりも大径の直管状の膨出部（拡径部）１ｃを形成し、その膨出部１ｃの軸線方向略中央部に、狭窄部Ａとして配管１の内方に突出するリング状の突出部（縮径部）１ｄを設けたものである。その突出部１ｄは、上記両端部１ａ，１ｂの内径と略同径に形成されている。
【００１２】
上記ＥＧＲ配管１の周囲には、上記膨出部１ｃおよび突出部１ｄを覆うようにして外管４を上記配管１と略同心状に設けることによって、上記配管１と外管４との間に冷却水を流通させるための通路Ｓを形成したもので、上記外管４の両端部は、図の場合は配管１と外管４とに溶接等で一体的に固着したリング状の端板４ａ，４ｂで閉塞した構成であるが、外管４のいずれか一方もしくは両方の端部を絞り加工して閉塞するようにしてもよい。
【００１３】
図中、５は冷却水導入管で、その導入管５に図に省略した連通管等を接続してエンジン冷却水の一部を上記配管１と外管４との間の上記通路Ｓ内に導入した後、配水管６から図に省略した連通管等を介してエンジン冷却水の管路内等に帰還させる構成である。７は上記配管１と外管４との間に残留する空気を排出させるための抜気管である。なお、図中の６を上記通路Ｓ内への冷却水導入管とし、５を配水管としてもよい。
【００１４】
なお上記のＥＧＲガス冷却装置を構成する部材の材質等は適宜であるが、好ましくはステンレス等の耐食性および耐熱性のよい金属を用いるとよく、特にＥＧＲ配管１としては、ＳＵＳ４３６を用いると、耐食性および耐熱性がよいだけでなく、熱伝導性がよく、冷却効率を向上させることができる。
【００１５】
上記の構成において、ＥＧＲ配管１と外管４との間の冷却水通路Ｓ内に冷却水を流通させた状態で、図に省略したエンジンからの排気ガスの一部をＥＧＲガスとして上記ＥＧＲ配管１の一端側（図の場合は左側の端部１ａ側）から該配管１内に導入すると、本実施形態においては、ＥＧＲ配管１の中間部に両端部１ａ，１ｂよりも大径の膨出部１ｃが形成されているので、先ず、その膨出部１ｃでＥＧＲガスが膨張する。その際、ＥＧＲガスの大部分は、図１（ａ）に矢印で示すようにＥＧＲ配管１の半径方向外方に拡がる傾向となり、上記膨出部１ｃの内面に押し付けられるようにして上記内面に沿って移動する。次いで、ＥＧＲガスは狭窄部Ａとしての突出部１ｄで圧縮された後、再び膨出部１ｃで膨張して膨出部１ｃの内面に向かって拡散し、その内面に押し付けられるようにして移動する。それによって、ＥＧＲガス中の熱が配管１の内面に順次良好に伝達され、上記配管１と外管４との間に流通する冷却水で効率よく冷却することができるものである。なお、その冷却されたＥＧＲガスは上記ＥＧＲ配管１の他端側（図の場合は右側の端部１ｂ側）から図に省略した接続管等を介してエンジンの吸気マニホールド等に導かれる。
【００１６】
上記のように本発明においては、ＥＧＲ配管１の途中に狭窄部Ａとしての突出部１ｄを設けたから、その突出部１ｄでＥＧＲガスが圧縮されたのち膨張し、その膨張する際のＥＧＲガスが拡がる作用でＥＧＲガス中の熱を配管１に効率よく伝達して冷却することができる。また図示例のように外管４の内側のＥＧＲ配管１に膨出部１ｃを形成すると、ＥＧＲ配管１の表面積が増し、そのＥＧＲ配管１と外管４との間の冷却水通路Ｓ内を流れる冷却水との接触面積が増大して冷却効果を更に向上させることが可能となる。
【００１７】
なお上記実施形態は、突出部１ｄの両側の膨出部１ｃを直管状に形成したが、例えば図２のように膨出部１ｃを滑らかな紡錘形状に形成してもよい。このように構成すると、ＥＧＲガスが突出部１ｄを通過する際の上記の膨張・拡散機能を維持した上でＥＧＲガスの流れをスムーズにすることができると共に、ＥＧＲガスが膨出部１ｃから突出部１ｄに移動する際に膨出部１ｃ内面へのＥＧＲガスの接触頻度や接触圧力等が増大して冷却効果を高めることができる。
【００１８】
上記のような狭窄部を構成する突出部１ｄは、ＥＧＲ配管１の軸線方向に複数個設けてもよく、その場合、突出部１ｄの大きさ形状等は適宜異ならせてもよく、あるいは同一の大きさ形状に形成してもよい。上記のように突出部１ｄを複数個設けると、ＥＧＲガスが膨張・拡散する回数が増えて冷却効果が向上すると共に、配管１の表面積が増し、その配管１と外管４との間の冷却水通路Ｓ内を流れる冷却水との接触面積が増大して冷却効果を更に向上させることができる。
【００２１】
また上記のようなＥＧＲ配管１の膨出部１ｃに、例えば図３のように多数の小突起１ｅを設けるようにしてもよく、そのような小突起１ｅを設けると、上記配管１の表面積、ひいては配管１と外管４との間の通路Ｓ内を流れる冷却水との接触面積が増大して冷却効果を更に向上させることができる。なお、上記図３の場合は小突起１ｅをＥＧＲ配管１の内側に突出させたが、ＥＧＲ配管１の外側に突出させてもよい。
【００２７】
【発明の効果】
以上のように本発明によるＥＧＲガス冷却装置は、ＥＧＲ配管１内に狭窄部Ａを設けたから、その狭窄部ＡによってＥＧＲ配管１の軸線方向におけるそれと直交方向の内空横断面積または内空横断面形状を変化させることが可能となり、その狭窄部ＡをＥＧＲガスが通過する際に、該ＥＧＲガスが一旦収縮もしくは圧縮されたのちに膨張し、その膨張力でＥＧＲガスがＥＧＲ配管１の内面に押し付けられるように順次接触してＥＧＲガス中の熱がＥＧＲ配管１に良好に伝達される。そして、そのＥＧＲ配管１に伝達された熱は、上記ＥＧＲ配管１と外管４との間に流通する冷却水によって効率よく冷却することができるもので、ＥＧＲ配管内に狭窄部を設けるだけの極めて簡単な構成によって冷却効率の優れたＥＧＲガス冷却装置を提供できるものである。
【図面の簡単な説明】
【図１】 （ａ）は本発明によるＥＧＲガス冷却装置の一実施形態を示す縦断面図。
（ｂ）は（ａ）におけるｂ−ｂ線断面図。
【図２】 本発明によるＥＧＲガス冷却装置の他の実施形態を示す縦断面図。
【図３】 ＥＧＲ配管の周面に小突起を設けた例の縦断面図。
【符号の説明】
１ ＥＧＲ配管
１ａ、１ｂ 端部
１ｃ 膨出部
１ｄ 突出部
１ｅ 小突起
２、３ フランジ継手
４ 外管
４ａ，４ｂ 端板
５ 冷却水導入管
６ 配水管
７ 抜気管
Ａ 狭窄部
Ｓ 冷却水通路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a so-called EGR gas cooling device that recirculates a part of exhaust gas discharged from an exhaust system of an engine such as an automobile to an intake system of the engine as EGR gas.
[0002]
[Prior art]
Conventionally, a part of exhaust gas discharged from the engine exhaust system is recirculated to the engine intake system as EGR gas for the purpose of reducing nitrogen oxides in the exhaust gas discharged from the engine as described above. It is known to provide so-called exhaust gas recirculation (EGR) devices. In this case, the EGR gas to be recirculated to the intake system needs to be appropriately cooled, and conventionally, an EGR gas cooling device provided with a cooling means is provided in the middle of the EGR pipe.
[0003]
As the EGR gas cooling apparatus as described above, for example, as disclosed in Japanese Patent Application Laid-Open Nos. 11-1931992 and 11-193993, an EGR pipe for circulating EGR gas is constituted by a large number of pipe members, It is known that the EGR gas is cooled by circulating cooling water between the outer pipe covering the EGR pipe and the EGR pipe, but the structure is complicated and the manufacturing cost is increased, and the apparatus is enlarged to increase the weight of the vehicle. There is a problem such as increase.
[0004]
Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 2001-207919, it is proposed to provide a cylindrical outer water cooling jacket for circulating cooling water on the outer periphery of the EGR pipe, and to provide a thin tubular inner water cooling jacket in the EGR pipe. . However, the provision of a thin tubular inner water-cooling jacket in the EGR pipe has problems such as complicated and cumbersome production costs.
[0005]
Further, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-265908, the EGR pipe is a single pipe, and cooling pipes (outer pipes) for circulating the cooling water are provided on the outer circumference of the EGR pipe. It has been proposed that the EGR pipe is formed in a corrugated cross section by forming an extending recess, thereby increasing the surface area of the EGR pipe and increasing the cooling efficiency, but the EGR gas flowing in the EGR pipe is simply Since it passes only as it is, there is a problem that a sufficient cooling effect cannot always be obtained.
[0006]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above problems, and an object of the present invention is to provide an EGR gas cooling device having an excellent cooling effect with a simple configuration.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an EGR gas cooling apparatus according to the present invention has the following configuration. That is, an outer pipe is provided on the outer periphery of the EGR pipe that recirculates part of the exhaust gas discharged from the engine exhaust system as EGR gas to the intake system of the engine, and cooling water is provided between the outer pipe and the EGR pipe. In the EGR gas cooling device that circulates and cools the EGR gas that passes through the EGR pipe, the EGR pipe in the outer pipe has a straight tubular or spindle-shaped bulging portion that is larger in diameter than both ends of the EGR pipe, A narrowed portion having a diameter smaller than that of the bulging portion is provided, and a ring-shaped projecting portion that is substantially the same diameter as both ends of the EGR pipe and projects inward of the EGR pipe is provided as the narrowed portion. To do. In addition, you may make it provide many small protrusions in the constriction part of the said EGR piping as needed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an EGR gas cooling device according to the present invention will be specifically described based on an embodiment shown in the drawings.
[0010]
FIG. 1 shows an embodiment of an EGR gas cooling apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes an EGR pipe, one end of which is connected to an engine exhaust manifold via a flange joint 2 and a connection pipe omitted in the figure. The other end is connected in communication with an intake manifold of the engine through a flange joint 3 and a connection pipe omitted in the drawing.
[0011]
In the present embodiment, the EGR pipe 1 is formed with a straight tubular bulging portion (expanded portion) 1c having a diameter larger than both end portions 1a and 1b by hydroforming or the like at the intermediate portion thereof. A ring-shaped protruding portion (reduced diameter portion) 1d protruding inward of the pipe 1 is provided as a constricted portion A at a substantially central portion in the axial direction of the portion 1c. The protruding portion 1d is upper Symbol both ends 1a, and is formed on the inner diameter substantially the same diameter of 1b.
[0012]
Around the EGR pipe 1, an outer pipe 4 is provided substantially concentrically with the pipe 1 so as to cover the bulging part 1 c and the protruding part 1 d, so that the pipe 1 and the outer pipe 4 are interposed between them. A passage S for circulating the cooling water is formed, and both end portions of the outer pipe 4 in the figure are ring-shaped end plates 4a fixed integrally to the pipe 1 and the outer pipe 4 by welding or the like. 4b, but either one or both ends of the outer tube 4 may be drawn and closed.
[0013]
In the figure, reference numeral 5 denotes a cooling water introduction pipe. A communication pipe or the like not shown in the figure is connected to the introduction pipe 5 so that a part of the engine cooling water is put into the passage S between the pipe 1 and the outer pipe 4. After the introduction, the configuration is such that the water is returned from the water distribution pipe 6 to the engine cooling water pipe or the like via a communication pipe or the like omitted in the drawing. 7 is an exhaust pipe for discharging the air remaining between the pipe 1 and the outer pipe 4. In the figure, 6 may be a cooling water introduction pipe into the passage S, and 5 may be a water distribution pipe.
[0014]
In addition, although the material of the member which comprises said EGR gas cooling device is appropriate, it is preferable to use a metal with good corrosion resistance and heat resistance such as stainless steel, and in particular, when SUS436 is used as the EGR pipe 1, the corrosion resistance is good. In addition to good heat resistance, heat conductivity is good, and cooling efficiency can be improved.
[0015]
In the above configuration, in a state in which the cooling water is circulated in the cooling water passage S between the EGR pipe 1 and the outer pipe 4, the EGR pipe uses a part of the exhaust gas from the engine omitted in the drawing as the EGR gas. 1 is introduced into the pipe 1 from one end side (the left end 1a side in the figure), in this embodiment, the middle portion of the EGR pipe 1 has a larger diameter than the both ends 1a and 1b. Since the portion 1c is formed, first, the EGR gas expands in the bulging portion 1c. At that time, most of the EGR gas tends to expand outward in the radial direction of the EGR pipe 1 as indicated by an arrow in FIG. 1A, and is pressed against the inner surface of the bulging portion 1c. Move along. Next, after the EGR gas is compressed by the projecting portion 1d as the constricted portion A, it expands again at the bulging portion 1c, diffuses toward the inner surface of the bulging portion 1c, and moves so as to be pressed against the inner surface. . Thereby, the heat in the EGR gas is sequentially and satisfactorily transmitted to the inner surface of the pipe 1 and can be efficiently cooled with the cooling water flowing between the pipe 1 and the outer pipe 4. The cooled EGR gas is guided from the other end side of the EGR pipe 1 (on the right end 1b side in the figure) to an intake manifold of the engine through a connection pipe omitted in the drawing.
[0016]
As described above, in the present invention, since the protruding portion 1d as the constricted portion A is provided in the middle of the EGR pipe 1, the EGR gas is expanded after being compressed by the protruding portion 1d, and the EGR gas at the time of the expansion is expanded. Due to the spreading action, the heat in the EGR gas can be efficiently transmitted to the pipe 1 and cooled. Moreover, when the bulging part 1c is formed in the EGR pipe 1 inside the outer pipe 4 as shown in the illustrated example, the surface area of the EGR pipe 1 increases, and the inside of the cooling water passage S between the EGR pipe 1 and the outer pipe 4 is increased. The contact area with the flowing cooling water is increased, and the cooling effect can be further improved.
[0017]
In the above embodiment, the bulging portions 1c on both sides of the projecting portion 1d are formed in a straight tube shape, but the bulging portions 1c may be formed in a smooth spindle shape as shown in FIG. If comprised in this way, while maintaining the said expansion | swelling and spreading | diffusion function at the time of EGR gas passing the protrusion part 1d, while the flow of EGR gas can be made smooth, EGR gas protrudes from the bulge part 1c. When moving to the portion 1d, the contact frequency of EGR gas to the inner surface of the bulging portion 1c, the contact pressure, and the like can be increased to enhance the cooling effect.
[0018]
Protruding portion 1d constituting a constriction as described above may be provided plurality in the axial direction of the E GR pipe 1, in which case, the size shape of the protruding portion 1d may be different suitable Yichun, or You may form in the same magnitude | size shape. When a plurality of protrusions 1d are provided as described above, the number of times that the EGR gas expands and diffuses increases, the cooling effect improves, the surface area of the pipe 1 increases, and the cooling between the pipe 1 and the outer pipe 4 occurs. The contact area with the cooling water flowing in the water passage S is increased, and the cooling effect can be further improved.
[0021]
Further, a large number of small protrusions 1e may be provided on the bulging portion 1c of the EGR pipe 1 as described above, for example, as shown in FIG. 3 , and when such small protrusions 1e are provided, the surface area of the pipe 1 is increased. As a result, the contact area with the cooling water flowing in the passage S between the pipe 1 and the outer pipe 4 is increased, and the cooling effect can be further improved. In the case of FIG. 3 described above, the small protrusion 1e is protruded inside the EGR pipe 1, but may be protruded outside the EGR pipe 1.
[0027]
【The invention's effect】
As described above, since the EGR gas cooling apparatus according to the present invention has the narrowed portion A in the EGR pipe 1, the narrowed portion A allows the internal air cross-sectional area or the internal air cross section in the direction perpendicular to the axial direction of the EGR pipe 1. It becomes possible to change the shape, and when the EGR gas passes through the constriction A, the EGR gas expands after being contracted or compressed once, and the EGR gas is expanded on the inner surface of the EGR pipe 1 by the expansion force. The heat in the EGR gas is transferred to the EGR pipe 1 satisfactorily in contact with each other so as to be pressed. The heat transmitted to the EGR pipe 1 can be efficiently cooled by the cooling water flowing between the EGR pipe 1 and the outer pipe 4, and only a constricted portion is provided in the EGR pipe. It is possible to provide an EGR gas cooling device having an excellent cooling efficiency with an extremely simple configuration.
[Brief description of the drawings]
FIG. 1A is a longitudinal sectional view showing an embodiment of an EGR gas cooling device according to the present invention.
(B) is the bb sectional view taken on the line in (a).
FIG. 2 is a longitudinal sectional view showing another embodiment of the EGR gas cooling device according to the present invention.
FIG. 3 is a longitudinal sectional view of an example in which small protrusions are provided on the peripheral surface of an EGR pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 EGR piping 1a, 1b End part 1c Expansion part 1d Protrusion part 1e Small protrusion 2, 3 Flange joint 4 Outer pipe 4a, 4b End plate 5 Cooling water introduction pipe 6 Water distribution pipe 7 Exhaust pipe A Constriction part S Cooling water passage

Claims (2)

エンジンの排気系から排出された排気ガスの一部をＥＧＲガスとしてエンジンの吸気系に再循環させるＥＧＲ配管の外周に外管を設け、その外管とＥＧＲ配管との間に冷却水を流通させて上記ＥＧＲ配管内を通るＥＧＲガスを冷却するＥＧＲガス冷却装置において、上記外管内のＥＧＲ配管に、該ＥＧＲ配管の両端部よりも大径の直管状または紡錘形状の膨出部と、その膨出部よりも小径の狭窄部とを設け、その狭窄部として上記ＥＧＲ配管の両端部と略同径で該ＥＧＲ配管の内方に突出するリング状の突出部を設けたことを特徴とするＥＧＲガス冷却装置。An outer pipe is provided on the outer periphery of the EGR pipe that recirculates a part of the exhaust gas discharged from the engine exhaust system to the intake system of the engine as EGR gas, and cooling water is circulated between the outer pipe and the EGR pipe. In the EGR gas cooling device that cools the EGR gas that passes through the EGR pipe, the EGR pipe in the outer pipe includes a straight tubular or spindle-shaped bulging portion that is larger in diameter than both ends of the EGR pipe, and its bulge. An EGR characterized in that a narrowed portion having a smaller diameter than the projecting portion is provided, and a ring-shaped projecting portion that is substantially the same diameter as both ends of the EGR pipe and projects inward of the EGR pipe is provided as the narrowed portion. Gas cooling device. 上記ＥＧＲ配管の膨出部に多数の小突起を設けてなる請求項１に記載のＥＧＲガス冷却装置。 The EGR gas cooling device according to claim 1 , wherein a plurality of small protrusions are provided on the bulging portion of the EGR pipe .
JP2002210406A 2002-07-19 2002-07-19 EGR gas cooling device Expired - Fee Related JP4236879B2 (en)

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JP2010266141A (en) * 2009-05-15 2010-11-25 Tlv Co Ltd Heat exchanger
JP2010266142A (en) * 2009-05-15 2010-11-25 Tlv Co Ltd Vaporization cooler
JP2011191034A (en) * 2010-03-16 2011-09-29 Showa Denko Kk Dual-pipe heat exchanger
JP5556644B2 (en) * 2010-12-17 2014-07-23 株式会社デンソー Multi-tube heat exchanger
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WO2016139711A1 (en) * 2015-03-02 2016-09-09 中国電力株式会社 Heat exchange device and fuel gas generation device
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