JP4121187B2 - EGR gas cooling device - Google Patents

EGR gas cooling device Download PDF

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Publication number
JP4121187B2
JP4121187B2 JP17398998A JP17398998A JP4121187B2 JP 4121187 B2 JP4121187 B2 JP 4121187B2 JP 17398998 A JP17398998 A JP 17398998A JP 17398998 A JP17398998 A JP 17398998A JP 4121187 B2 JP4121187 B2 JP 4121187B2
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Prior art keywords
tube
tube sheet
egr gas
heat transfer
sheet
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JPH11351074A (en
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豊博 古屋
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Usui Co Ltd
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Usui Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンの冷却液、カーエアコン用冷媒または冷却風などによってＥＧＲガスを冷却する装置に関する。
【０００２】
【従来の技術】
排気ガスの一部を排気系から取出して、再びエンジンの吸気系に戻し、混合気に加える方法は、ＥＧＲ（Ｅｘｈａｕｓｔ Ｇａｓ Ｒｅｃｉｒｃｕｌａｔｉｏｎ：排気再循環）と称される。ＥＧＲはＮＯｘ（窒素酸化物）の発生抑制、ポンプ損失の低減、燃焼ガスの温度低下に伴う冷却液への放熱損失の低減、作動ガス量・組成の変化による比熱比の増大と、これに伴うサイクル効率の向上など、多くの効果が得られることから、エンジンの熱効率を改善するには有効な方法とされている。
【０００３】
しかるに、ＥＧＲガスの温度が高くなりかつＥＧＲガス量が増大すると、その熱作用によりＥＧＲバルブの耐久性が劣化し、早期破損を招く場合があったり、その防止のために水冷構造とする必要があることや吸気温度の上昇に伴い充填効率の低下により燃費の低下などが認識されている。このような事態を避けるため、エンジンの冷却液などによってＥＧＲガスを冷却する装置が用いられている。この装置としては、一般に多管式の熱交換器が利用される。
【０００４】
この場合に利用される多管式の熱交換器は、図５、図６にその一例を示すごとく、両端部に冷却媒体流入口１１−１および冷却媒体流出口１１−２を設けた胴管１１内部において、伝熱管群１２の両端部が板金製のチューブシート１３にろう付けにより固定され、一方、チューブシート１３はその外周端部を胴管１１の内壁にろう付けにより固着して配列され、前記胴管１１の一方の端部にはＥＧＲガスの流入口１４ａ−１が設けられた端部キャップ１４ａが固着され、また他方の端部にはＥＧＲガスの流出口１４ｂ−１が設けられた端部キャップ１４ｂが固着された構成となし、かつ前記端部キャップ１４ａ、１４ｂのガス流入口１４ａ−１および流出口１４ｂ−１の外側開口端部に締結用フランジ１５ａ、１５ｂが外嵌固着された構造となっている。
【０００５】
【発明が解決しようとする課題】
従来の、ＥＧＲガスの冷却に用いられる多管式の熱交換器における胴管１１、板金製のチューブシート１３および端部キャップ１４ａ、１４ｂの接合部は図６に拡大して示すごとく、胴管１１の両開口端部と端部キャップ１４ａ、１４ｂとの間にチューブシート１３が炉中ろう付けにより固定された構造となっているが、かかる構造の場合、ろう付け時の胴管１１と伝熱管群１２、チューブシート１３および端部キャップ１４ａ、１４ｂの加熱・冷却のタイムラグによる各部の熱膨張差により、図７に示すごとくチューブシート１３が変形し、ろう付け性、ろう付け強度が低下するという問題があった。そして、このようなチューブシート１３の変形は伝熱管長が長いほど顕著であることも確認されている。
【０００６】
本発明は、上記した多管式熱交換器の胴管、チューブシートおよび端部キャップの接合構造に起因するチューブシートの変形によるろう付け性、ろう付け強度の低下の問題を解決するためになされたもので、チューブシートの形状を変えることによって伝熱管長の長短にかかわらずろう付け時の熱膨張の影響をほとんど受けることのないＥＧＲガス冷却装置を提供しようとするものである。
【０００７】
【課題を解決するための手段】
本発明は、上記課題を解決するため、両端部に冷却媒体流入口および冷却媒体流出口が設けられた胴管の内壁の両端部付近に固定されたチューブシートに伝熱管群が固着配列され、さらに前記胴管の両端部には端部キャップが設けられ、また前記端部キャップにはＥＧＲガスの流入口と流出口が設けられ、前記端部キャップのガス流入口および流出口の外側開口端部に締結用フランジが外嵌固着された構造の多管式のＥＧＲガス冷却装置において、伝熱管群の両端部を固着配列するチューブシートを断面コ字形状またはカップ形とし、該チューブシートと前記伝熱管群がろう付けによって接合固着され、さらに該チューブシートの外周面が胴管内壁の両端部に固着され、該チューブシートの管軸方向外端部に端部キャップが固着された構造となしたことを特徴とするものである。
【０００８】
すなわち、本発明はろう付け時の胴管、伝熱管群、チューブシートおよび端部キャップの熱膨張差によるチューブシートの変形を防止するため、チューブシートを断面コ字形状またはカップ形としたもので、これによりチューブシートと伝熱管群を先にろう付けし、後工程で胴管内壁の両端部とチューブシートとを溶接することが可能となりチューブシートに対する熱影響をほとんどなくすことができる。
【０００９】
また、本発明における断面コ字形状またはカップ形のチューブシートは、外向きまたは内向きのいずれの向きに配置してもよく、またサイズ的には両方共に同一径のものを用いるのが一般的であるが、伝熱管の長いＥＧＲガス冷却装置の場合は製作上径の異なるチューブシートを用いる方が好ましい。すなわち、伝熱管が長くなると胴管が楕円形状となり、チューブシートと胴管との組付け性が悪くなる。このため径の異なるチューブシートを用いると、仮に胴管が多少楕円形状となっていても、径の大きい方のチューブシート側はそのまま外嵌でき、径の小さいチューブシート側は胴管の径を絞って外嵌することになるため、胴管とチューブシートとの組付け性が良好となるからである。
【００１０】
【発明の実施の形態】
図１〜図４は本発明に係る多管式のＥＧＲガス冷却装置の構造を例示したもので、図１は断面コ形で同一径のチューブシートを外向きに用いたＥＧＲガス冷却装置の一実施例を中央部を省略して示す拡大横断平面図、図２は断面コ形で径の異なるチューブシートを外向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図、図３は断面コ字形で同一径のチューブシートを内向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図、図４は断面コ形で径の異なるチューブシートを内向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図であり、１は胴管、１−１は冷却媒体流入口、１−２は冷却媒体流出口、２は伝熱管群、３はチューブシート、４は端部キャップ、４−１はＥＧＲガスの流入口、４−２はＥＧＲガスの流出口、５は締結用フランジである。
【００１１】
まず、図１に示す本発明の多管式のＥＧＲガス冷却装置は、両端部に冷却媒体流入口１−１および冷却媒体流出口１−２を設けた胴管１内部において、両端部にそれぞれ外向きに配置した断面コ字形のチューブシート３に伝熱管群２の両端部をろう付けまたは溶接により固定する。一方、チューブシート３はその外周部を胴管１の両端内壁にろう付けまたは溶接により追って固着する。また、前記チューブシート３の一方の開口端部にはＥＧＲガスの流入口４−１が設けられた端部キャップ４が固着され、また他方の開口端部にはＥＧＲガスの流出口４−２が設けられた端部キャップ４が固着され、この両側の端部キャップ４に締結用フランジ５が固着された構成となしている。
【００１２】
次に、図２に示すＥＧＲガス冷却装置は、チューブシートと胴管との組付け性を考慮して、径の異なる断面コ字形チューブシートを外向きに用いた例で、この場合胴管１は径の大きい方のチューブシート３の外径と同一径の内径を有し、径の大きい方のチューブシート３側は胴管１をそのまま径の大きい方のチューブシート３に外嵌して追ってろう付けまたは溶接し、径の小さい方のチューブシート３側は胴管１の端部を絞って当該チューブシート３に外嵌して追ってろう付けまたは溶接する。そして、両端部のチューブシート３の開口端部に端部キャップ４を予めろう付けまたは溶接する。
【００１３】
また、図３に示すＥＧＲガス冷却装置は、断面コ字形で同一径のチューブシートを内向きに用いた例で、構造的にはチューブシート３が内向きに配置され、その背面側端部に端部キャップ４が溶接されている以外は図１のものと同一である。
【００１４】
さらに、図４に示すＥＧＲガス冷却装置は、チューブシートと胴管との組付け性を考慮して、径の異なる断面コ字形チューブシートを内向きに用いた例で、構造的にはチューブシート３が内向きに配置され、その背面側端部に端部キャップ４が溶接されている以外は図２のものと同一である。
【００１５】
上記した図１〜図４に示す各ＥＧＲガス冷却装置において、その組立てに際しては、断面コ字形のチューブシート３に伝熱管群２を先にろう付けし、後工程で胴管１の両側を溶接することができるので、チューブシート３に対する胴管１と伝熱管群２の熱膨張の影響をほぼ皆無にできる。また、この手順で組立てることにより、胴管１をチューブシート３に溶接する前にチューブシート３と伝熱管群２とのろう付け状態の良否をチューブシート３の両側から確認することができる点でも有利である。
【００１６】
なおここでは、チューブシートとして断面コ字形のものを例にとり説明したが、カップ形のチューブシートでも同様の作用効果が得られることはいうまでもない。
【００１７】
【発明の効果】
以上説明したごとく、本発明のＥＧＲガス冷却装置は、伝熱管群を固着配列するチューブシートを断面コ字形状またはカップ形としたことにより、ろう付け時の胴管、伝熱管群、チューブシートおよび端部キャップの熱膨張差によるチューブシートの変形をほぼ完全に防止することができ優れたろう付け性、ろう付け強度が得られ、また両側のチューブシートのサイズを変えることによって伝熱管の長いものでもろう付け時の熱膨張の影響をほとんど受けることがないため、チューブシートの変形をほぼ完全に防止することができ、ろう付け性、ろう付け強度の優れたものが得られ、さらに胴管をチューブシートに溶接する前にチューブシートと伝熱管群とのろう付け状態の良否を確認することができるので、品質の信頼性を確保できるなどの優れた効果を奏する。
【図面の簡単な説明】
【図１】断面コ字形で同一径のチューブシートを外向きに用いたＥＧＲガス冷却装置の一実施例を中央部を省略して示す拡大横断平面図である。
【図２】断面コ字形で径の異なるチューブシートを外向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図である。
【図３】断面コ字形で同一径のチューブシートを内向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図である。
【図４】断面コ字形で径の異なるチューブシートを内向きに用いたＥＧＲガス冷却装置の一実施例を示す図１相当図
【図５】本発明の対象とする従来の多管式のＥＧＲガス冷却装置の一例を示す一部破断平面図である。
【図６】同上従来のＥＧＲガス冷却装置の胴管、チューブシートおよび端部キャップの接合部分を拡大して示す断面図である。
【図７】図６に示す接合部分の変形例を拡大して示す断面図である。
【符号の説明】
１ 胴管
１−１ 冷却媒体流入口
１−２ 冷却媒体流出口
２ 伝熱管群
３ チューブシート
４ 端部キャップ
４−１ ＥＧＲガスの流入口
４−２ ＥＧＲガスの流出口
５ 締結用フランジ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus that cools EGR gas with engine coolant, a car air conditioner refrigerant, cooling air, or the like.
[0002]
[Prior art]
A method in which a part of the exhaust gas is taken out from the exhaust system, returned to the engine intake system, and added to the air-fuel mixture is called EGR (Exhaust Gas Recirculation). EGR suppresses the generation of NOx (nitrogen oxide), reduces pump loss, reduces heat dissipation loss to the coolant due to lowering of combustion gas temperature, and increases specific heat ratio due to changes in working gas amount / composition. Since many effects such as improvement of cycle efficiency can be obtained, it is an effective method for improving the thermal efficiency of the engine.
[0003]
However, when the temperature of the EGR gas is increased and the amount of EGR gas is increased, the durability of the EGR valve is deteriorated due to its thermal action, which may cause premature breakage, and a water cooling structure is necessary to prevent this. It is recognized that there is a decrease in fuel consumption due to a decrease in charging efficiency as the intake air temperature increases. In order to avoid such a situation, an apparatus that cools EGR gas with engine coolant or the like is used. As this apparatus, a multi-tube heat exchanger is generally used.
[0004]
As shown in FIG. 5 and FIG. 6, the multitubular heat exchanger used in this case is a trunk pipe provided with a cooling medium inlet 11-1 and a cooling medium outlet 11-2 at both ends. 11, both end portions of the heat transfer tube group 12 are fixed to the tube sheet 13 made of sheet metal by brazing, while the tube sheet 13 is arranged with its outer peripheral end fixed to the inner wall of the trunk tube 11 by brazing. An end cap 14a provided with an EGR gas inlet 14a-1 is fixed to one end of the trunk tube 11, and an EGR gas outlet 14b-1 is provided at the other end. The end cap 14b is fixed, and the fastening flanges 15a and 15b are externally fixed to the outer opening ends of the gas inlet 14a-1 and the outlet 14b-1 of the end caps 14a and 14b. Structure and You have me.
[0005]
[Problems to be solved by the invention]
As shown in an enlarged view of FIG. 6, the joint portion of the trunk tube 11, the sheet metal tube sheet 13 and the end caps 14a and 14b in the conventional multi-tube heat exchanger used for cooling the EGR gas is shown in FIG. 11 has a structure in which the tube sheet 13 is fixed by brazing in the furnace between both open end portions and the end caps 14a, 14b. The tube sheet 13 is deformed as shown in FIG. 7 due to the difference in thermal expansion between the heating tube group 12, the tube sheet 13, and the end caps 14a and 14b due to the time lag of heating and cooling, and the brazing property and brazing strength are lowered. There was a problem. And it has also been confirmed that such deformation of the tube sheet 13 becomes more conspicuous as the heat transfer tube length is longer.
[0006]
The present invention has been made in order to solve the problems of brazing property and brazing strength reduction due to deformation of the tube sheet due to the joining structure of the above-described tube tube, tube sheet and end cap of the multi-tube heat exchanger. Therefore, an EGR gas cooling device that is hardly affected by thermal expansion during brazing regardless of the length of the heat transfer tube by changing the shape of the tube sheet is provided.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a heat transfer tube group fixedly arranged on a tube sheet fixed in the vicinity of both ends of the inner wall of the trunk tube provided with a cooling medium inlet and a cooling medium outlet at both ends, further, the the end cap provided we are at both ends of the cylinder tube, also inlet and the outlet of the EGR gas is provided in said end cap, the outer opening of the gas inlet and outlet of said end cap In a multi-tube EGR gas cooling apparatus having a structure in which a fastening flange is fitted and fixed to an end portion, a tube sheet in which both ends of a heat transfer tube group are fixedly arranged has a U-shaped cross section or a cup shape, the heat transfer tube group are bonded secured by brazing, it is further fixed to both end portions of the outer peripheral surface cylinder inner wall of the tube sheet, and the end cap in the axial direction of the tube outer end of the tube sheet is secured structure It is characterized in that the.
[0008]
That is, in the present invention, in order to prevent deformation of the tube sheet due to the difference in thermal expansion of the trunk tube, the heat transfer tube group, the tube sheet, and the end cap during brazing, the tube sheet has a U-shaped cross section or a cup shape. This brazing by the lithium Yubushito and the heat transfer tube bank above, it is possible to substantially eliminate thermal influence on the tubesheet becomes possible to weld the end portions and the tube sheet of the body tube wall in a later step.
[0009]
In addition, the U-shaped tube shape or cup-shaped tube sheet in the present invention may be arranged in either the outward direction or the inward direction, and in general, both of them have the same diameter. However, in the case of an EGR gas cooling device having a long heat transfer tube, it is preferable to use tube sheets having different diameters in terms of production. That is, when the heat transfer tube becomes long, the trunk tube becomes elliptical, and the assembling property between the tube sheet and the trunk tube is deteriorated. For this reason, when tube sheets with different diameters are used, even if the trunk tube is somewhat elliptical, the tube sheet side with the larger diameter can be externally fitted as it is, and the tube sheet side with the smaller diameter has the diameter of the trunk tube. This is because the outer tube is squeezed and fitted, so that the assembling property between the trunk tube and the tube sheet becomes good.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 exemplify the structure of a multi-tube EGR gas cooling apparatus according to the present invention. FIG. 1 is a diagram of an EGR gas cooling apparatus that uses a tube sheet having a U-shaped cross section and the same diameter outwardly. FIG. 2 is an enlarged cross-sectional plan view showing the embodiment with the central portion omitted, and FIG. 2 is an equivalent view of FIG. 1 showing an embodiment of an EGR gas cooling device using a tube sheet having a U-shaped cross section and a different diameter outward. FIG. 4 is a view corresponding to FIG. 1 showing an embodiment of an EGR gas cooling device using a tube sheet having the same U-shape and the same diameter inward, and FIG. 4 is an EGR using a tube sheet having a cross-section and a different diameter inward. FIG. 1 is a view corresponding to FIG. 1 showing an embodiment of a gas cooling device, wherein 1 is a trunk tube, 1-1 is a cooling medium inlet, 1-2 is a cooling medium outlet, 2 is a heat transfer tube group, 3 is a tube sheet, 4 is an end cap, 4-1 is an EGR gas inlet, and 4-2 is an EGR gas flow. Mouth, 5 is a fastening flange.
[0011]
First, the multi-tube type EGR gas cooling device of the present invention shown in FIG. 1 is provided at both ends in the body tube 1 provided with a cooling medium inlet 1-1 and a cooling medium outlet 1-2 at both ends. Both ends of the heat transfer tube group 2 are fixed to the tube sheet 3 having a U-shaped cross section disposed outward by brazing or welding. On the other hand, the outer periphery of the tube sheet 3 is fixed to the inner walls of both ends of the body tube 1 by brazing or welding. An end cap 4 provided with an EGR gas inlet 4-1 is fixed to one opening end of the tube sheet 3, and an EGR gas outlet 4-2 is attached to the other opening end. The end cap 4 provided with is fixed, and the fastening flange 5 is fixed to the end caps 4 on both sides.
[0012]
Next, the EGR gas cooling device shown in FIG. 2 is an example in which a U-shaped tube sheet having a different diameter is used outwardly in consideration of the assembling property of the tube sheet and the trunk tube. Has the same inner diameter as the outer diameter of the tube sheet 3 with the larger diameter, and the tube sheet 3 side with the larger diameter follows the body tube 1 as it is by being externally fitted to the tube sheet 3 with the larger diameter. Brazing or welding is performed, and the tube sheet 3 side having a smaller diameter is squeezed at the end of the body tube 1 and externally fitted to the tube sheet 3 to be brazed or welded. Then, the end caps 4 are brazed or welded in advance to the open ends of the tube sheets 3 at both ends.
[0013]
In addition, the EGR gas cooling device shown in FIG. 3 is an example in which a tube sheet having a U-shaped cross section and the same diameter is used inward, and the tube sheet 3 is structurally arranged inwardly, 1 except that the end cap 4 is welded.
[0014]
Further, the EGR gas cooling device shown in FIG. 4 is an example in which a U-shaped tube sheet having a different diameter is used inward in consideration of the assembling property of the tube sheet and the trunk tube. 2 is the same as that of FIG. 2 except that the end cap 4 is welded to the rear side end portion.
[0015]
In each EGR gas cooling device shown in FIGS. 1 to 4 described above, when assembling, the heat transfer tube group 2 is brazed first to the tube sheet 3 having a U-shaped cross section, and both sides of the body tube 1 are welded in a subsequent process. Therefore, the influence of the thermal expansion of the trunk tube 1 and the heat transfer tube group 2 on the tube sheet 3 can be almost eliminated. Also, by assembling in this procedure, it is possible to confirm the quality of the brazed state between the tube sheet 3 and the heat transfer tube group 2 from both sides of the tube sheet 3 before welding the tube 1 to the tube sheet 3. It is advantageous.
[0016]
Here, the tube sheet having a U-shaped cross section has been described as an example, but it goes without saying that a similar effect can be obtained even with a cup-shaped tube sheet.
[0017]
【The invention's effect】
As described above, the EGR gas cooling device of the present invention has a tubular sheet, a heat transfer tube group, a tube sheet, and a tube sheet at the time of brazing by making the tube sheet to which the heat transfer tube group is fixedly arranged in a U-shaped cross section or a cup shape. Deformation of the tube sheet due to the difference in thermal expansion of the end cap can be almost completely prevented, resulting in excellent brazing and brazing strength, and by changing the size of the tube sheet on both sides, even long heat transfer tubes Because it is almost unaffected by thermal expansion during brazing, deformation of the tube sheet can be almost completely prevented, and excellent brazing and brazing strength can be obtained. The quality of the brazed state between the tube sheet and the heat transfer tube group can be checked before welding to the sheet, ensuring reliability of quality, etc. It exhibits an excellent effect.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional plan view showing an embodiment of an EGR gas cooling device using a tube sheet having a U-shaped cross section and the same diameter outwardly, with the central portion omitted.
FIG. 2 is a view corresponding to FIG. 1 showing an embodiment of an EGR gas cooling device using a tube sheet having a U-shaped cross section and a different diameter outwardly;
FIG. 3 is a view corresponding to FIG. 1 showing an embodiment of an EGR gas cooling apparatus using a tube sheet having a U-shaped cross section and the same diameter inward.
FIG. 4 is a view corresponding to FIG. 1 showing an embodiment of an EGR gas cooling device in which a tube sheet having a U-shaped cross section and a different diameter is used inward. FIG. 5 is a diagram showing a conventional multi-tube EGR that is an object of the present invention. It is a partially broken top view which shows an example of a gas cooling device.
FIG. 6 is an enlarged cross-sectional view showing a joint portion of a trunk tube, a tube sheet, and an end cap of the conventional EGR gas cooling apparatus.
7 is an enlarged cross-sectional view showing a modified example of the joint portion shown in FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body pipe 1-1 Cooling medium inflow port 1-2 Cooling medium outflow port 2 Heat transfer tube group 3 Tube sheet 4 End cap 4-1 EGR gas inflow port 4-2 EGR gas outflow port 5 Fastening flange

Claims (1)

両端部に冷却媒体流入口および冷却媒体流出口が設けられた胴管の内壁の両端部付近に固定されたチューブシートに伝熱管群が固着配列され、さらに前記胴管の両端部には端部キャップが設けられ、また前記端部キャップにはＥＧＲガスの流入口と流出口が設けられ、前記端部キャップのガス流入口および流出口の外側開口端部に締結用フランジが外嵌固着された構造の多管式のＥＧＲガス冷却装置において、伝熱管群の両端部を固着配列するチューブシートを断面コ字形状またはカップ形とし、該チューブシートと前記伝熱管群がろう付けによって接合固着され、さらに該チューブシートの外周面が胴管内壁の両端部に固着され、該チューブシートの管軸方向外面端部に端部キャップが固着された構造となしたことを特徴とするＥＧＲガス冷却装置。A heat transfer tube group is fixedly arranged on a tube sheet fixed near both ends of the inner wall of the trunk tube provided with a cooling medium inlet and a cooling medium outlet at both ends, and end portions are provided at both ends of the trunk tube. cap provided et al are also in the end cap outlet is provided with the inlet of the EGR gas, the fastening flange is fitted fixed to the outer open end of the gas inlet and outlet of said end cap In the multi-tube type EGR gas cooling device having the above-described structure, the tube sheet that fixes and arranges both ends of the heat transfer tube group has a U-shaped cross section or a cup shape, and the tube sheet and the heat transfer tube group are joined and fixed by brazing. , is further secured the outer peripheral surface of the tube sheet at both ends of the cylinder tube wall, EGR gas, characterized in that the end cap in the axial direction of the tube outer surface end portion of the tube sheet is without a fixed structure Retirement system.
JP17398998A 1998-06-05 1998-06-05 EGR gas cooling device Expired - Fee Related JP4121187B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP17398998A JP4121187B2 (en) 1998-06-05 1998-06-05 EGR gas cooling device

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JP4121187B2 true JP4121187B2 (en) 2008-07-23

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Publication number Priority date Publication date Assignee Title
JP2001272185A (en) * 2000-03-27 2001-10-05 Calsonic Kansei Corp Egr gas cooling device and manufacturing method therefor
JP2007051576A (en) * 2005-08-17 2007-03-01 Tokyo Roki Co Ltd Egr cooler
KR100774690B1 (en) 2006-12-04 2007-11-08 현대자동차주식회사 Egr cooler for automobile
DE102007010134A1 (en) 2007-02-28 2008-09-04 Behr Gmbh & Co. Kg Heat exchanger e.g. radiator, for e.g. exhaust gas recycling system of diesel engine, has block closure element for fluid-sealed separation of chamber and fluid contact, and housing provided for connecting block at contact
EP2719885B1 (en) * 2012-10-11 2016-12-14 Volvo Car Corporation An arrangement for cooling exhaust gases in an internal combustion engine

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