JP2007077839A - Egr gas cooling device - Google Patents
Egr gas cooling device Download PDFInfo
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- JP2007077839A JP2007077839A JP2005264496A JP2005264496A JP2007077839A JP 2007077839 A JP2007077839 A JP 2007077839A JP 2005264496 A JP2005264496 A JP 2005264496A JP 2005264496 A JP2005264496 A JP 2005264496A JP 2007077839 A JP2007077839 A JP 2007077839A
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- egr gas
- cooling device
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- adapter ring
- gas cooling
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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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
- F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
Abstract
Description
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。 The present invention relates to an apparatus that cools EGR gas with engine coolant, a car air conditioner refrigerant, cooling air, or the like.
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、該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。 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), and the EGR is NOx (nitrogen oxide). There are many things such as suppression of gas generation, reduction of pump loss, reduction of heat dissipation loss to coolant due to lowering of combustion gas temperature, increase of specific heat ratio due to change of working gas amount and composition, and improvement of cycle efficiency accompanying this Since the effect is obtained, it is considered an effective method for improving the thermal efficiency of the engine.
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る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、とりわけトータル的な熱交換効率に優れる多管式の熱交換器からなる、シェルアンドチューブ型のＥＧＲ冷却装置が数多く採用されている。 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, a device that cools the EGR gas with engine coolant or the like is used, and in particular, a shell-and-tube type EGR cooling composed of a multi-tube heat exchanger having excellent total heat exchange efficiency. Many devices are used.
上記汎用の多管式の熱交換器からなるＥＧＲガス冷却装置は、図１７（ａ）にその一例を示すごとく、外周部の両端部に冷却媒体流入口３２および冷却媒体流出口３３を設けた胴管の左右開口部が、その内壁に板状のチューブシート３５の外周端部をろう付することによって閉塞されたシェル本体３１の内部において、該チューブシート３５に複数の伝熱管３４がその両端部を所定の間隔でろう付によって固着配列されることにより、ＥＧＲガス流路となる伝熱管群が形成され、該シェル本体３１の一方の端部にはＥＧＲガスの流入口３７が設けられたボンネット３６−１が固着され、対応する他方の端部にはＥＧＲガスの流出口３８が設けられたボンネット３６−２が固着され、それぞれのボンネット３６−１、３６−２のガス流入口３７および流出口３８の外側開口端部に締結用フランジ３７−１、３８−１が外嵌固着され、ＥＧＲガス回収配管路におけるＥＧＲガス冷却装置を構成し（例えば、特許文献１参照）、前記ＥＧＲガス流入口３７側のボンネット３６−１を介して流入した高温のＥＧＲガスが、前記シェル本体３１の内側にチューブシート３５を介して固着配列されてＥＧＲガス流路を形成する前記伝熱管群を通流する間に、該シェル本体３１の外周端部に設けられた冷却媒体入口３２から流入して、下流側の冷却媒体出口３３から流出するエンジン冷却水によって熱交換され、前記シェル本体３１のＥＧＲガス下流側のボンネット３６−２を介して、ＥＧＲガス流出口３８から排出されるＥＧＲガスは、所定の温度域にまで効果的に冷却されるように構成されている。 As shown in FIG. 17 (a), the EGR gas cooling apparatus including the general-purpose multi-tube heat exchanger is provided with the cooling medium inlet 32 and the cooling medium outlet 33 at both ends of the outer peripheral portion. Inside the shell main body 31 where the left and right openings of the trunk tube are closed by brazing the outer peripheral end of the plate-like tube sheet 35 to the inner wall thereof, a plurality of heat transfer tubes 34 are connected to the tube sheet 35 at both ends thereof. The heat transfer tube group serving as the EGR gas flow path is formed by fixing and arranging the parts by brazing at a predetermined interval, and an EGR gas inlet 37 is provided at one end of the shell body 31. A bonnet 36-1 is fixed, and a bonnet 36-2 provided with an EGR gas outlet 38 is fixed to the other corresponding end, and a gas inlet 37 of each of the bonnets 36-1 and 36-2 is fixed. The fastening flanges 37-1 and 38-1 are externally fitted and fixed to the outer opening end of the outlet 38 and constitute an EGR gas cooling device in the EGR gas recovery piping (see, for example, Patent Document 1). The high-temperature EGR gas that has flowed in through the bonnet 36-1 on the gas inlet 37 side is fixedly arranged inside the shell body 31 via the tube sheet 35 to form the EGR gas flow path. During the flow, heat is exchanged by the engine coolant flowing in from the cooling medium inlet 32 provided at the outer peripheral end of the shell main body 31 and flowing out from the cooling medium outlet 33 on the downstream side. The EGR gas discharged from the EGR gas outlet 38 through the hood 36-2 on the downstream side of the EGR gas is configured to be effectively cooled to a predetermined temperature range. That.
一方、上記排気ガス再循環システム（以下「ＥＧＲ冷却システム」ということがある。）においては、高温のＥＧＲガスを所定の温度域に冷却するだけに止まらず、該排気ガス中に含まれる所謂ＰＭと呼ばれる微粒子状物質からなる煤やカーボン等の堆積や汚れの付着を阻止することが、配管内の閉塞や熱交換器の性能低下を防止して、エンジンの信頼性を高める上で望ましいが、図１８（ａ）に例示するＥＧＲ冷却システムにおいては、排気ガス回収管路１５におけるＥＧＲクーラー（熱交換器）１６までの配管内部および／または前記ＥＧＲクーラー１６の排気ガスとの接触部の一部または全面に、同図（ｂ）に例示するような酸化触媒１７をコーティングして担持させるか、同図（ｃ）および（ｄ）に例示するような酸化触媒１７をコートして担持させた触媒コンバーター１８を、該配管内等に挿設する排気ガス再循環燃焼システムにおける異物付着防止方法（例えば、特許文献２参照）が提案されている。
上記従来のＥＧＲガス冷却装置においては、用いられる多管式熱交換器におけるシェル本体３１、板状のチューブシート３５およびボンネット３６−１、３６−２の接合部は同図（ｂ）に拡大して示すように、シェル本体３１の開口端部とボンネット３６−１、３６−２との間にチューブシート３５が炉中ろう付けにより固定された構造となっているが、かかる接合構造の場合、シェル本体３１の開口端部とボンネット３６−１、３６−２およびチューブシート３５のろう付け部に何等かの原因、例えば製造段階でのろう付け不良あるいは振動や衝撃などにより亀裂が入りシェル本体３１内の冷却媒体（エンジンの冷却液など）が同図（ｂ）中矢印で示すように水洩れが発生すると、ボンネット３６−１、３６−２のガス流入口３７または流出口３８側へ漏出し、ＥＧＲガスと混入してエンジン内部に侵入しエンジン故障やエンジン損傷等の重大なトラブルの原因となることが懸念され、早急に解決を望まれる大きな課題であった。 In the conventional EGR gas cooling apparatus, the joint portion of the shell main body 31, the plate-like tube sheet 35, and the bonnets 36-1 and 36-2 in the used multi-tube heat exchanger is enlarged in FIG. As shown in the figure, the tube sheet 35 is fixed between the open end of the shell body 31 and the bonnets 36-1, 36-2 by brazing in the furnace. The shell main body 31 is cracked due to some cause, for example, defective brazing or vibration or shock at the manufacturing stage, at the open end of the shell main body 31 and the brazed portions of the bonnets 36-1, 36-2 and the tube sheet 35. When water leakage occurs in the internal coolant (engine coolant, etc.) as indicated by arrows in FIG. 5B, the gas inlet 37 or the flow of the bonnets 36-1, 36-2. Leak into the mouth 38 side, is feared to cause serious trouble in the engine failure or engine damage like penetrates into the engine mixed with the EGR gas, it was a major challenge to the desired urgently resolved.
一方、上記排気ガス再循環燃焼システムにおける異物付着防止方法によれば、該配管内やＥＧＲクーラーにおける酸化触媒のコーティングや触媒コンバーターの挿設によって、煤やカーボン等の異物の堆積や付着を防止する上において優れた成果が確認されているが、用いられる酸化触媒は熱による劣化が著しく、例えばＥＧＲクーラーにおける伝熱管などに酸化触媒をコーティングした後に、チューブシートへの固着配列を炉中ろう付によって実施した場合には、該酸化触媒が熱によって劣化していわゆるシンタリング現象がおきそれによってその触媒活性を失い、酸化触媒としての機能を発揮することができないという課題が残されていた。本発明は上記した多管式熱交換器におけるシェル本体、チューブシートおよびボンネットなどの接合構造に起因するろう付け部を健全な状態で維持しながら、触媒コンバーターに内装された酸化触媒、還元触媒、三元触媒などの機能が保護された状態でＥＧＲクーラーに接合して、高温のＥＧＲガスを所定の温度域にまで安定的に冷却すると同時に、該ＥＧＲガス中に含有する煤やカーボンが、該配管系や熱交換器の管壁や器壁に堆積付着することを効果的に抑制し、当該システムの性能を長期間に亘って健全な状態で維持することのできると共に、吸気管に戻されるＥＧＲガスを予め浄化しておくことによってエンジンからの排気ガスの清浄度合を更に向上させることができるＥＧＲガス冷却装置を提供しようとするものである。 On the other hand, according to the foreign matter adhesion prevention method in the exhaust gas recirculation combustion system, accumulation of foreign matter such as soot and carbon is prevented by attaching an oxidation catalyst coating or a catalytic converter in the pipe or EGR cooler. Although excellent results have been confirmed above, the oxidation catalyst used is significantly deteriorated by heat. For example, after coating the oxidation catalyst on a heat transfer tube in an EGR cooler, the fixing arrangement on the tube sheet is brazed in the furnace. When implemented, the oxidation catalyst deteriorates due to heat and a so-called sintering phenomenon occurs, thereby losing its catalytic activity and leaving the function as an oxidation catalyst remaining. The present invention provides an oxidation catalyst, a reduction catalyst, and a catalytic converter built in a catalytic converter while maintaining a brazed portion due to a joining structure such as a shell body, a tube sheet, and a bonnet in the above-described multi-tube heat exchanger. It joins to an EGR cooler in a state where the functions of the three-way catalyst and the like are protected to stably cool the high-temperature EGR gas to a predetermined temperature range, and at the same time, soot and carbon contained in the EGR gas Effectively suppresses deposits and deposits on pipe walls and wall of pipes and heat exchangers, can maintain the performance of the system in a healthy state for a long time, and return to the intake pipe It is an object of the present invention to provide an EGR gas cooling device that can further improve the cleanliness of exhaust gas from an engine by purifying EGR gas in advance.
上記課題を解決するため本発明によるＥＧＲガス冷却装置は、シェル本体における外周部の左右両端部に冷却媒体出入口が設けられ、内壁部の左右両端部近傍にはチューブシートが固定され、該チューブシートを介して複数の伝熱管が間隔を隔てて固着配列されて伝熱管群を形成し、前記シェル本体における左右の両端部に、ＥＧＲガスの流入口と流出口とを形成するボンネットが、それぞれ一体に設けられる多管式熱交換型のＥＧＲガス冷却装置において、ＥＧＲガス流入口側ボンネットを延長して、触媒コンバーター収納用ケーシングを形成すると共に、該ケーシングとシェル本体とが、間に熱障壁部を介在させながら溶接によって接合されることを特徴的構成要件とするものである。 In order to solve the above problems, an EGR gas cooling device according to the present invention is provided with cooling medium inlets and outlets at the left and right ends of the outer peripheral portion of the shell body, and a tube sheet is fixed in the vicinity of the left and right ends of the inner wall. A plurality of heat transfer tubes are fixedly arranged at intervals through a heat transfer tube group to form a heat transfer tube group, and bonnets forming EGR gas inlets and outlets are integrally formed at both left and right ends of the shell body, respectively. In the multi-tube heat exchange type EGR gas cooling apparatus provided in the EGR gas, the EGR gas inlet bonnet is extended to form a casing for housing the catalytic converter, and the casing and the shell body are provided with a thermal barrier portion therebetween. It is characterized by joining by welding while interposing.
また、本発明による上記ＥＧＲガス冷却装置において、前記熱障壁部がシェル本体、チューブシート、アダプターリングおよび触媒コンバーター収納用ケーシングに形成する屈曲部、薄肉部、突合せフランジ部の中から選択される少なくとも１つ以上であることを特徴とするものである。 In the EGR gas cooling device according to the present invention, at least the thermal barrier portion is selected from a bent portion, a thin portion, and a butt flange portion formed in a shell body, a tube sheet, an adapter ring, and a catalytic converter housing casing. It is one or more.
さらに、本発明による上記ＥＧＲガス冷却装置において、前記触媒コンバーター収納用ケーシングとシェル本体とが、アダプターリングを介して一体として密着接合されることを特徴とするものである。 Furthermore, in the EGR gas cooling device according to the present invention, the casing for housing the catalytic converter and the shell main body are closely bonded together through an adapter ring.
またさらに、本発明による上記ＥＧＲガス冷却装置において、前記触媒コンバーター収納用ケーシングとチューブシートとが、アダプターリングを介して一体として密着接合されることを特徴とするものである。 Furthermore, in the EGR gas cooling device according to the present invention, the catalytic converter housing casing and the tube sheet are integrally and closely joined via an adapter ring.
本発明による上記ＥＧＲガス冷却装置は、前記アダプターリングの軸心方向における断面形状が、略Ｚ字形状であることを特徴とするものである。 The EGR gas cooling device according to the present invention is characterized in that the cross-sectional shape of the adapter ring in the axial direction is substantially Z-shaped.
本発明による上記ＥＧＲ冷却装置はさらに、前記アダプターリングが、円筒体であることを特徴とするものである。 The EGR cooling device according to the present invention is further characterized in that the adapter ring is a cylindrical body.
本発明によるＥＧＲガス冷却装置によれば、シェル本体におけるＥＧＲガスの流れの上流側に、ＥＧＲガス流入口となるボンネットを固着するに際し、該ボンネットの長さを延長してその内周部に、酸化触媒、還元触媒、三元触媒などの各種触媒を収納し得る触媒コンバーター用のケーシングとすると共に、該ケーシングとシェル本体との溶接による接合にあたり、該溶接部とシェル本体との間、若しくは該溶接部と触媒コンバーター用ケーシングとの間に、溶接熱の伝達を妨げるための熱障壁部を介在させることにより、シェル本体においては該シェル本体とチューブシートとの固着、若しくは該チューブシートと伝熱管端部との固着配列等において施されたろう付部への、溶接熱による影響を阻止してその健全な接合状態を維持すると同時に、触媒が担持されたコンバーターをシェル本体と一括ろう付けした場合の触媒コンバーター収納用のケーシングに収納された各種触媒がろう付け熱によりシンタリング現象を生じて劣化するのを防いで、該触媒の機能を初期の状態で維持することができる。従って本発明によるＥＧＲガス冷却装置は、排気ガス再循環燃焼システムにおけるＥＧＲクーラーとして、優れた冷却効率を発揮すると同時に、該排気ガス中に含有するＰＭやカーボンを可及的に減少して、それらの煤や汚れの堆積や付着に起因する配管の閉塞や熱交換効率の低下を未然に防ぐことができると共にエンジンからの排気ガスの清浄度合を更に向上させることができる。 According to the EGR gas cooling device of the present invention, when the hood serving as the EGR gas inlet is fixed to the upstream side of the EGR gas flow in the shell body, the length of the bonnet is extended to the inner periphery thereof. A casing for a catalytic converter that can accommodate various catalysts such as an oxidation catalyst, a reduction catalyst, and a three-way catalyst, and in joining the casing and the shell body by welding, between the welded portion and the shell body, or the In the shell body, the shell body and the tube sheet are fixed to each other or the tube sheet and the heat transfer tube are interposed by interposing a thermal barrier portion for preventing the transfer of welding heat between the welded portion and the catalytic converter casing. It is the same as preventing the influence of welding heat on the brazed part applied in the fixed arrangement with the end part and maintaining its healthy joining state. In addition, when the converter carrying the catalyst is collectively brazed to the shell body, various catalysts housed in the casing for housing the catalyst converter are prevented from being deteriorated due to a sintering phenomenon caused by brazing heat. Can be maintained in the initial state. Therefore, the EGR gas cooling device according to the present invention exhibits excellent cooling efficiency as an EGR cooler in an exhaust gas recirculation combustion system, and at the same time reduces PM and carbon contained in the exhaust gas as much as possible. It is possible to prevent the blockage of the piping and the decrease in heat exchange efficiency due to the accumulation and adhesion of soot and dirt, and to further improve the cleanliness of the exhaust gas from the engine.
本発明における上記熱障壁部の形成手段は、シェル本体とチューブシートとのろう付部の延長上にあるいずれかに、屈曲部や薄肉部、突合せフランジ部などを形成しても良く、シェル本体と、該シェル本体の前方に連なって接合される触媒コンバーター収納用ケーシングとの間の接合部材として、軸心方向における断面形状が略Ｚ字形状か、或いは単に円筒状のアダプターリングが用いることにより、該アダプターリングをそのまま熱障壁部とすることができると同時に、該アダプターリングに前記屈曲部や薄肉部、或いは突合せフランジ部を形成して熱の伝達を阻止することもできる。本発明における溶接による上記の接合手段は、当該多管式熱交換器における触媒コンバーターケーシングの接合のみならず、シェル本体におけるＥＧＲガス流入口側のボンネットの接合においても、好適に採用することが可能であり、それによって炉内ろう付けにおける構造上の制約を回避することができ、加えて溶接作業が簡略となってその信頼性が向上し、さらにはシェル本体の組込みにおける工数を省略できるなど、加工コストの大幅な削減が期待できる。 The means for forming the thermal barrier portion in the present invention may form a bent portion, a thin portion, a butt flange portion or the like on any of the extensions of the brazed portion between the shell body and the tube sheet. And a catalytic converter housing casing joined continuously in front of the shell body, the axial cross-sectional shape is substantially Z-shaped, or simply by using a cylindrical adapter ring. The adapter ring can be used as a thermal barrier as it is, and at the same time, the bent portion, the thin portion, or the butt flange portion can be formed on the adapter ring to prevent heat transfer. The above-mentioned joining means by welding in the present invention can be suitably employed not only for joining the catalytic converter casing in the multi-tube heat exchanger but also for joining the bonnet on the EGR gas inlet side in the shell body. Therefore, it is possible to avoid structural limitations in brazing in the furnace, in addition, the welding work is simplified and its reliability is improved, and further, the man-hours for assembling the shell body can be omitted, etc. A significant reduction in processing costs can be expected.
以下本発明の実施するための最良の形態について、添付した図面並びに実施例に基づいてさらに詳細に、且つ具体的に説明するが、本発明はこれにより拘束されるものではなく、本発明の主旨の範囲内で自由に設計変更が可能である。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in more detail and specifically with reference to the accompanying drawings and examples, but the present invention is not restricted thereby, and the gist of the present invention. The design can be freely changed within the range of
図１はシェル本体の前方に触媒コンバーター収納用ケーシングを一体として接合した、本発明によるＥＧＲガス冷却装置の一部省略縦断側面図、図２は本発明に係る第１実施例によるシェル本体と触媒コンバーターケーシングとの接合状態を示し、軸心方向における断面形状が略Ｚ字形状のアダプターリングを、両者間における熱障壁部として介在させ、溶接によって接合した状態を示す要部縦断側面図、図３は同じく第２実施例を示し、アダプターリングが円筒状であって、シェル本体の端部開口部内壁部にろう付によって固着されたチューブシートに予め該円筒状のアダプターリングを熱障壁部として介在させ、溶接によって接合した状態を示す要部拡大側面図、図４は同じく第３実施例を示し、シェル本体の端部開口部外周面にろう付によって固着されるチューブシートに、軸心方向における断面形状が略Ｚ字形状のアダプターリングを予め両者間における熱障壁部として介在させ、溶接によってケーシングと接合した状態を示す要部拡大側面図、図５および図６は本発明に係る第４、第５実施例を示し、アダプターリングの小径部が後方にシェル本体側に位置する要部拡大側面図、図７は同じく第６実施例を示し、シェル本体の端部開口部の内周壁面にろう付によって固着されるチューブシートの外周面が、円筒状に折り曲げられ、該円筒部分の中間部に外側に突出する屈曲部が形成され、その延長線上においてアダプターリングが予め溶接され，ろう付け後ケーシングが溶接によって接合される状態を示す要部拡大側面図、図８は同じく第７実施例を示し、上記実施例６において屈曲部が形成されない状態においてケーシングが接合される状態を示す要部拡大側面図、図９および図１０は同じく第８実施例と第９実施例を示し、前者は円筒状に形成されるチューブシートの外周部の先端部分が、やや肉厚に形成され、該肉厚部分とアダプターリングが予め溶接され，ろう付け後ケーシングが溶接によって接合され、後者におけるチューブシートはその板厚が厚く、該チューブシートの外周面に予め形成された段部とアダプターリングを予め溶接し、シェル本体における端部開口部内周面にろう付によって固着後、触媒コンバーターケーシングが、溶接により接合される状態を示すそれぞれ要部拡大側面図、図１１〜１３は本発明に係る他の実施態様に属し、熱障壁部としてのアダプターリングを用いず、チューブシート若しくはケーシング、或いはその双方の接合部分に熱障壁部を形成する第１０実施例〜第１２実施例を示し、図１１における第１０実施例においては、シェル本体の端部開口部の内壁面にろう付されたチューブシートの外周部先端を断面略Ｌ字状に延長し、一方、ケーシング接合部の先端部もそれに対応して断面Ｌ字状に形成して両者を突合せ、形成されるフランジ状の円周部を溶接によって接合する状態を示す要部拡大側面図、図１２における第１１実施例においては、チューブシートの外周部の先端延長部に、外周方向に突出した屈曲部を形成した状態でシェル本体における端部開口部内壁面にろう付し、該チューブシートの屈曲部先端とケーシングとを接合する状態を示し、図１３における第１２実施例においては、チューブシートの先端延長部に、前記実施例１１における屈曲部に加え、前記実施例１０における断面Ｌ字状に突合せ部を形成し、該突合せ部によって形成されるフランジ状の円周部を、溶接によって接合する状態を示す要部拡大側面図、図１４および１５においてはシェル本体と触媒コンバーター用ケーシングとの接合に、再びアダプターリングを用いる本発明に係る第１３実施例と第１４実施例とを示し、図１４に示す前者においては、シェル本体にろう付されたチューブシート先端に、軸心方向における断面形状が略Ｌ字形状にアダプターリングをろう付によって予め固着し、前記ケーシングの先端を同じく略Ｌ字状に形成し、上記実施例１０における突合せフランジ部と同様、そのフランジ状の円周部を溶接によって接合する状態を示す要部拡大側面図、図１５に示す後者においては、前記実施例１３におけるアダプターリングに、熱障壁部となる薄肉部を環状に形成した以外は、実質的に上記実施例と同様にしてシェル本体とケーシングが接合される状態を示す要部拡大斜視図、図１６は本発明におけるシェル本体と触媒コンバーター内蔵ケーシングとが、溶接によって接合される際の手順を説明するための、要部拡大側面図である。 FIG. 1 is a partially omitted vertical side view of an EGR gas cooling device according to the present invention in which a casing for housing a catalytic converter is integrally joined in front of a shell body, and FIG. 2 is a shell body and a catalyst according to a first embodiment of the present invention. FIG. 3 is a cross-sectional side view of an essential part showing a state of joining with a converter casing, showing an adapter ring having a substantially Z-shaped cross section in the axial direction as a thermal barrier between them and joined by welding. Shows the second embodiment, the adapter ring is cylindrical, and the cylindrical adapter ring is interposed as a thermal barrier portion in advance in a tube sheet fixed to the inner wall of the end opening of the shell body by brazing. 4 is an enlarged side view of the main part showing a state of being joined by welding. FIG. 4 shows the third embodiment, and brazing the outer peripheral surface of the end opening of the shell body. Accordingly, an enlarged side view of a main part showing a state in which an adapter ring having a substantially Z-shaped cross section in the axial direction is interposed in advance as a thermal barrier between the two and welded to the casing by welding. 5 and 6 show the fourth and fifth embodiments according to the present invention, an enlarged side view of the main portion where the small diameter portion of the adapter ring is located rearward on the shell body side, FIG. 7 shows the sixth embodiment, The outer peripheral surface of the tube sheet that is fixed to the inner peripheral wall surface of the end opening of the shell body by brazing is bent into a cylindrical shape, and a bent portion that protrudes outward is formed at an intermediate portion of the cylindrical portion. FIG. 8 shows a seventh embodiment of the present invention, in which the adapter ring is welded in advance on the wire and the casing is joined by welding after brazing. FIG. 9 and FIG. 10 similarly show the eighth embodiment and the ninth embodiment, and the former is formed in a cylindrical shape. The distal end portion of the outer peripheral portion of the tube sheet is formed to be slightly thick, the thick portion and the adapter ring are welded in advance, the brazed casing is joined by welding, and the tube sheet in the latter is thick. A state in which the step formed on the outer peripheral surface of the tube sheet and the adapter ring are welded in advance, and the catalytic converter casing is joined by welding after being fixed to the inner peripheral surface of the end opening of the shell body by brazing. FIG. 11 to 13 belong to other embodiments according to the present invention, respectively, without using an adapter ring as a thermal barrier, A tenth embodiment to a twelfth embodiment in which a thermal barrier portion is formed at the joint portion of the sheet or the casing or both are shown. In the tenth embodiment in FIG. 11, the inner wall surface of the end opening of the shell body is shown. The flanged end formed by extending the distal end of the outer periphery of the brazed tube sheet into a substantially L-shaped cross-section, and forming the corresponding end of the casing joint with an L-shaped cross-section correspondingly. The main part enlarged side view which shows the state which joins the circumference part of this by welding, In the 11th Example in FIG. 12, the state which formed the bending part which protruded in the outer peripheral direction in the front-end | tip extension part of the outer peripheral part of a tube sheet FIG. 13 shows a state where the shell body is brazed to the inner wall surface of the end opening and the bent portion tip of the tube sheet is joined to the casing. In the twelfth embodiment in FIG. In addition to the bent portion in the eleventh embodiment, a butt portion is formed in a cross-sectional L shape in the tenth embodiment, and a flange-shaped circumferential portion formed by the butt portion is welded to the tip extension portion of the tongue. 14 and 15 show a thirteenth embodiment and a fourteenth embodiment according to the present invention in which an adapter ring is used again to join the shell body and the catalytic converter casing. In the former shown in FIG. 14, the adapter ring is fixed to the tip of the tube sheet brazed to the shell main body in advance by brazing so that the cross-sectional shape in the axial direction is substantially L-shaped, and the tip of the casing is also substantially the same. It is formed in an L-shape and, similar to the butt flange portion in Example 10 above, an enlarged main portion showing a state in which the flange-shaped circumferential portion is joined by welding. In the latter shown in the side view and FIG. 15, the shell main body and the casing are substantially the same as in the above embodiment, except that the adapter ring in the embodiment 13 is formed with a thin wall portion to be a heat barrier portion in an annular shape. The principal part expansion perspective view which shows the state joined, FIG. 16: is a principal part expansion side view for demonstrating the procedure at the time of joining the shell main body and the catalyst converter built-in casing in this invention by welding.
本発明の多管式熱交換器型のＥＧＲガス冷却装置は、その基本的構造が図１に示すように後述するシェル本体２の外周の両端部に、冷却媒体流入口ｃ−１および冷却媒体流出口ｃ−２を設けられ、両端部が開口した胴管の内周部において、該両端部における開口部が金属製板材で形成されたカップ状のチューブシート２−１、２−２よって、それぞれ内向きに嵌挿されて閉塞され、該チューブシート２−１、２−２には複数の伝熱管７が所定の間隔を隔てて固着配列され、その両端部を通常ろう付けにより固定している。一方、前記チューブシート２−１、２−２はカップ状に形成されたその外周部を、前記胴管の両端開口部における内壁もしくは外壁に嵌挿もしくは外嵌して、当該部分を通常ろう付けにより固着して多管式熱交換器におけるシェル本体２を形成している。また、前記チューブシート２−１の外側の外周端部にはＥＧＲガスの流出口ｇ−２が設けられたボンネット３が外嵌され、これまた通常ろう付けまたは溶接により固着され、他方のチューブシート２−２の外側には、ＥＧＲガス流入口ｇ−１となるボンネットに代えて、該ボンネットを前方に延長するように形成された触媒コンバーター６収納用のケーシング４が外嵌され、その内部に各種触媒を担持させた触媒コンバーター６を内蔵した状態で、溶接によって一体として固着され、本発明における触媒コンバーター内蔵のＥＧＲ冷却装置１が提供される。 The multi-tube heat exchanger type EGR gas cooling device of the present invention has a basic structure as shown in FIG. 1 at both ends of the outer periphery of the shell body 2 to be described later, a cooling medium inlet c-1 and a cooling medium. In the inner peripheral part of the trunk tube provided with the outlet c-2 and both ends opened, the cup-like tube sheets 2-1 and 2-2 in which the openings at the both ends are formed of a metal plate, A plurality of heat transfer tubes 7 are fixedly arranged at predetermined intervals on the tube sheets 2-1 and 2-2, and both ends thereof are usually fixed by brazing. Yes. On the other hand, the tube sheets 2-1 and 2-2 are usually brazed by inserting or externally fitting the outer periphery of the cup sheet into the inner wall or the outer wall at both ends of the trunk tube. To form the shell body 2 in the multi-tube heat exchanger. A bonnet 3 provided with an EGR gas outlet g-2 is externally fitted to the outer peripheral end of the tube sheet 2-1, and is usually fixed by brazing or welding. On the outside of 2-2, instead of the bonnet serving as the EGR gas inlet g-1, a casing 4 for housing the catalytic converter 6 formed so as to extend the bonnet forward is externally fitted, and inside thereof The EGR cooling device 1 with a built-in catalytic converter according to the present invention is provided, which is fixed integrally by welding in a state in which the catalytic converter 6 carrying various catalysts is built-in.
ここで本実施例によるシェル本体２におけるチューブシート２−１および２−２の接合、該チューブシート２-１および２−２と、伝熱管７との接合については、図２における接合部分イ、ロ、ハ、ニで示す部分に置きろうを施し、炉内ろう付けによって一体として接合され、ＥＧＲガス流出口ｇ−２側ボンネット３とシェル本体２との接合については、炉内ろう付け若しくは溶接による接合のいずれかを適宜に選択することとなる。また、触媒コンバーター６内蔵ケーシング４と、シェル本体２との接合の接合方法についてより具体的に説明すると、図２に示すように接合される両者間に、軸心方向における断面形状が略Ｚ字形状のアダプターリング５を予めシェル本体２に溶接Ｗ１した後、チューブシート、管、シェル本体、ボンネットなどＥＧＲクーラー本体全体のろう付けを実施し、その後該アダプターリング５の他端を、溶接部Ｗ２において溶接によって接合して、シェル本体２と触媒コンバーター６を内蔵するケーシング４とを、一体として形成することにより排気ガス再循環燃焼システムにおける、ＥＧＲガス冷却装置１が完成する。 Here, for the joining of the tube sheets 2-1 and 2-2 in the shell body 2 according to the present embodiment, the joining of the tube sheets 2-1 and 2-2, and the heat transfer tube 7, the joining portion a in FIG. The parts indicated by (b), (c) and (d) are brazed and joined together by brazing in the furnace, and for joining the EGR gas outlet g-2 side bonnet 3 and the shell body 2, brazing or welding in the furnace One of the joinings according to the above will be selected as appropriate. Further, the joining method for joining the casing 4 with the built-in catalytic converter 6 and the shell body 2 will be described in more detail. The cross-sectional shape in the axial direction is substantially Z-shaped between the two joined as shown in FIG. After the adapter ring 5 having a shape is welded W 1 to the shell body 2 in advance, the entire EGR cooler body such as a tube sheet, a pipe, a shell body, and a bonnet is brazed, and then the other end of the adapter ring 5 is connected to the welded portion. The EGR gas cooling device 1 in the exhaust gas recirculation combustion system is completed by integrally joining the shell body 2 and the casing 4 containing the catalytic converter 6 by welding at W 2 .
本実施例における上記ＥＧＲガス冷却装置１によれば、シェル本体２と触媒コンバーター６を内蔵するケーシング４との溶接による接合に際し、間にアダプターリング５を介在させることによって熱障壁部として作用し、溶接の際に発生する高温の熱が、シェル本体２におけるチューブシート２−２とのろう付面、並びに該チューブシート２−２と伝熱管７とのろう付面に到達する以前に冷却され、熱歪などの影響を殆ど無視できる程度にまで低減すことができる。また、ケーシング４内に内蔵された触媒コンバーター６に担持された各種触媒も、溶接による熱の影響を回避してシンタリングすることなく、十分な触媒活性を維持した状態で内蔵されていることが確認され、ＥＧＲガス冷却装置における伝熱面への煤の堆積や付着は抑制され、ＥＧＲガスの伝熱空間の流出口付近における広汎な流路と、長い期間に亘って煤やカーボンの除去が効果的に実施され、該装置の性能が長期間に亘って健全な状態で維持されると共にエンジンからの排気ガスの清浄度が向上することが確認された。 According to the EGR gas cooling device 1 in the present embodiment, when the shell main body 2 and the casing 4 containing the catalytic converter 6 are joined by welding, the adapter ring 5 is interposed therebetween to act as a thermal barrier portion. The high-temperature heat generated during welding is cooled before reaching the brazed surface of the shell body 2 with the tube sheet 2-2 and the brazed surface of the tube sheet 2-2 and the heat transfer tube 7, It is possible to reduce the influence such as thermal strain to a level that can be almost ignored. Also, the various catalysts carried on the catalytic converter 6 built in the casing 4 may be built in a state in which sufficient catalytic activity is maintained without being affected by the influence of heat caused by welding and sintering. It is confirmed that soot accumulation and adhesion on the heat transfer surface in the EGR gas cooling device is suppressed, and a wide flow path in the vicinity of the outlet of the heat transfer space of the EGR gas and removal of soot and carbon over a long period of time. Effectively implemented, it was confirmed that the performance of the apparatus was maintained in a healthy state for a long time and the cleanliness of exhaust gas from the engine was improved.
図３に要部を拡大して示すように、アダプターリング５ａが円筒状であって、シェル本体２ａの端部開口部内壁部にろう付によって固着されるチューブシート２ａ−２に、該円筒状のアダプターリング５ａを熱障壁部として予め溶接Ｗ１して介在させ、シェル本体２ａと触媒コンバーター６ａを内蔵したケーシング４ａとを、溶接Ｗ２によって接合した以外は実施例１と同様にしてＥＧＲガス冷却装置１ａを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in the enlarged view of FIG. 3, the adapter ring 5a is cylindrical, and the cylindrical shape is attached to the tube sheet 2a-2 that is fixed to the inner wall of the end opening of the shell body 2a by brazing. adapter ring 5a and is interposed beforehand welded W 1 to as a thermal barrier portion, the shell main body 2a and a casing 4a incorporating a catalytic converter 6a, EGR gas except joined in the same manner as in example 1 by welding W 2 of As a result of obtaining a cooling device 1a and subjecting it to a cooling test in the EGR gas circulation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
図４に要部を拡大して示すように、シェル本体２ｂの端部開口部外周面にろう付によって固着されるチューブシート２ｂ−２に、軸心方向における断面形状が略Ｚ字形状のアダプターリング５ｂを、シェル本体２ｂと触媒コンバーター６ｂを内蔵するケーシング４ｂの両者間における熱障壁部として予めチューブシート２ｂ−２と溶接Ｗ１して介在させ、その後溶接Ｗ２によって接合したした以外は上記実施例１と同様にしてＥＧＲガス冷却装置１ｂを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in an enlarged view in FIG. 4, an adapter having a substantially Z-shaped cross section in the axial direction is attached to the tube sheet 2b-2 fixed to the outer peripheral surface of the end opening of the shell body 2b by brazing. the ring 5b, the shell main body 2b and catalytic converter 6b advance the tube sheet 2b-2 welding W 1 to be interposed as a thermal barrier portion between both casing 4b having a built-in, except where joined by subsequent welding W 2 above The EGR gas cooling device 1b was obtained in the same manner as in Example 1, and as a result of being subjected to the cooling test in the EGR gas circulation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
図５に要部を拡大して示すように、アダプターリング５ｃの小径部が後方のシェル本体２ｃ側に位置するようにして、それぞれ接合された以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｃを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in FIG. 5 in an enlarged manner, the EGR gas is the same as in Example 1 except that the small diameter portion of the adapter ring 5c is located on the rear shell body 2c side and is joined to each other. As a result of obtaining a cooling device 1c and subjecting it to a cooling test in the EGR gas circulation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
図６に要部を拡大して示すように、アダプターリング５ｄの小径部が後方のシェル本体２ｄ側に位置するようにして、それぞれ接合された以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｄを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in FIG. 6 in an enlarged manner, the EGR gas is the same as in Example 1 except that the small diameter portion of the adapter ring 5d is positioned on the rear shell body 2d side and is joined to each other. As a result of obtaining a cooling device 1d and subjecting it to a cooling test in the EGR gas circulation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
図７に要部を拡大して示すように、シェル本体２ｅの端部開口部の内周壁面にろう付によって固着されるチューブシート２ｅ−２の外周面が、円筒状に折り曲げられ、該円筒部分の中間部に外側に突出する屈曲部２ｅ−３が形成され、その延長線上において、アダプターリング５ｅが予めチューブシート２ｅ−２に溶接Ｗ１され、その後触媒コンバーター６ｅ内蔵のケーシング４ｅを、溶接Ｗ２によって接合した以外は上記実施例１と同様にしてＥＧＲガス冷却装置１ｅを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in an enlarged view in FIG. 7, the outer peripheral surface of the tube sheet 2e-2 fixed by brazing to the inner peripheral wall surface of the end opening of the shell body 2e is bent into a cylindrical shape. portions are bent portions 2e-3 protruding outward in the intermediate portion is formed, on its extended line, adapter ring 5e is welded W 1 in advance in the tubesheet 2e-2, then the catalytic converter 6e internal casing 4e, welding except joined by W 2 are obtained the EGR gas cooling device 1e in the same manner as in example 1, the results were subjected to cooling tests in EGR gas the circulation system under the same conditions as in example 1, also excellent as in example 1 The result was confirmed.
図８に要部を拡大して示すように、チューブシート２ｆ−２の外周面における円筒部の折り曲げ部に、外側に突出する屈曲部２ｅ−３を形成しなかった以外は、上記実施例６と同様にしてＥＧＲガス冷却装置１ｆを得、実施例１と同一の条件でＥＧＲガス該循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in FIG. 8 in an enlarged manner, the above Example 6 except that the bent portion 2e-3 protruding outward is not formed in the bent portion of the cylindrical portion on the outer peripheral surface of the tube sheet 2f-2. In the same manner as above, an EGR gas cooling device 1f was obtained and subjected to a cooling test in the EGR gas circulation system under the same conditions as in Example 1. As a result, the same excellent results as in Example 1 were confirmed.
図９に要部を拡大して示すように、第８実施例は、円筒状に形成されるチューブシート２ｇ−２の外周部の先端部分が、やや肉厚に形成され、該肉厚部分とアダプターリング５ｇとが予め溶接Ｗ１され、その後シェル２ｇ、チューブシート２ｇ−２、チューブ、ボンネットなどＥＧＲクーラー本体全体のろう付けを実施し、その後、ケーシング４ｇがアダプターリング５ｇに溶接Ｗ２によって接合され、上記実施例１と同様にしてＥＧＲガス冷却装置１ｇを得、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in the enlarged view of the main part in FIG. 9, in the eighth embodiment, the distal end portion of the outer peripheral portion of the tube sheet 2 g-2 formed in a cylindrical shape is formed slightly thick, and adapter ring 5g is previously welded W 1, then the shell 2g, tubesheet 2 g-2, was performed tube, the brazing of the entire EGR cooler body such as the hood, then the casing 4g is welded W 2 to the adapter ring 5g As a result of obtaining the EGR gas cooling device 1g in the same manner as in Example 1 and subjecting it to a cooling test in the EGR gas recirculation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed. It was.
図１０に要部を拡大して示すように、第９実施例は、チューブシート２ｈ−２はその板厚が厚く、シェル本体２ｈにおける端部開口部内周面にろう付によって固着されるが、該チューブシート２ｈ−２の外周面に予め形成された段部とアダプターリング５ｈが予め溶接Ｗ１され、その後シェル２ｈ、チューブシート２ｈ−２、チューブ、ボンネットなどＥＧＲクーラー本体全体のろう付けを実施し、その後、触媒コンバーター６ｈ内蔵のケーシング４ｈが、アダプターリング５ｈに溶接Ｗ２によってそれぞれ接合した以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｈを得、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 As shown in the enlarged view of the main part in FIG. 10, in the ninth embodiment, the tube sheet 2h-2 has a large plate thickness and is fixed to the inner peripheral surface of the end opening portion of the shell body 2h by brazing. the tubesheet 2h-2 of the outer peripheral surface preformed stepped portion and the adapter ring 5h is previously welded W 1, carried out thereafter shell 2h, tubesheet 2h-2, tubes, brazing of the entire EGR cooler body such as the hood and, thereafter, a catalytic converter 6h internal casing 4h are, except where respectively joined to the adapter ring 5h by welding W 2, to give the EGR gas cooling device 1h in the same manner as in example 1, the same conditions as in example 1 As a result of being subjected to a cooling test in the EGR gas recirculation system, the same excellent results as in Example 1 were confirmed.
図１１に要部を拡大して示す本実施例は、本発明に係る他の実施態様に属し、熱障壁部としてのアダプターリングを用いず、チューブシート若しくはケーシング、或いはその双方の接合部分に熱障壁部を形成する第１０実施例を示すものであって、図１１における第１０実施例においては、シェル本体２ｉの端部開口部の内壁面にろう付される、チューブシート２ｉ−２の外周部先端を断面形状略Ｌ字状２ｉ−４に形成して延長し、一方、ケーシング４ｉの接合部先端部もそれに対応して断面形状Ｌ字状４ｉ−４に形成して両者を突合せ、形成されるフランジ状の円周部を溶接Ｗ２によって接合した以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｉを得、冷却装置１ｉを、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 FIG. 11 shows an enlarged view of the main portion of the present embodiment, which belongs to another embodiment of the present invention, and does not use an adapter ring as a thermal barrier portion, and heats the tube sheet and / or casing, or the joint portion of both. 11 shows a tenth embodiment for forming a barrier portion. In the tenth embodiment in FIG. 11, the outer periphery of the tube sheet 2i-2 brazed to the inner wall surface of the end opening of the shell body 2i. The tip of the part is formed in a substantially L-shaped cross section 2i-4 and extended, while the tip of the joint part of the casing 4i is also formed in a cross-sectional L-shaped 4i-4 to match each other. except joined by welding W 2 a flange-like circumferential portion being to give the EGR gas cooling device 1i in the same manner as in example 1, the cooling device 1i, re EGR gas under the same conditions as in example 1 In the circulation system As a result of being subjected to a cooling test, the same excellent results as in Example 1 were confirmed.
図１２に要部を拡大して示す本実施例は、本発明に係る他の実施態様に属し、熱障壁部としてのアダプターリングを用いず、チューブシート若しくはケーシング、或いはその双方の接合部分に熱障壁部を形成する第１１実施例を示すものであって、図１２における第１１実施例においては、チューブシート２ｊ−２の外周部の先端延長部に、外周方向に突出した屈曲部２ｊ−３を形成した状態でシェル本体２ｊにおける端部開口部内壁面にろう付し、該チューブシート２ｊ−２の屈曲部先端とケーシング４ｊとを、溶接Ｗ２によって接合した以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｊを得、冷却装置１ｊを、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 FIG. 12 shows an enlarged main portion of the present embodiment, which belongs to another embodiment according to the present invention, and does not use an adapter ring as a thermal barrier portion, and heats a tube sheet or a casing, or a joint portion of both. An eleventh embodiment for forming a barrier portion is shown. In the eleventh embodiment in FIG. 12, a bent portion 2j-3 projecting in the outer peripheral direction is provided at the distal end extension of the outer peripheral portion of the tube sheet 2j-2. brazed to the end portion opening wall surface of the shell body 2j while forming, a bending portion tip and the casing 4j of the tubesheet 2j-2, except that welded W 2 are as in example 1 The EGR gas cooling device 1j was obtained, and the cooling device 1j was subjected to a cooling test in the EGR gas recirculation system under the same conditions as in Example 1. As a result, the same excellent results as in Example 1 were obtained. confirmed.
図１３に要部を拡大して示す本実施例は、本発明に係る他の実施態様に属し、熱障壁部としてのアダプターリングを用いず、チューブシート若しくはケーシング、或いはその双方の接合部分に熱障壁部を形成する第１２実施例を示すものであって、図１３における第１２実施例においては、チューブシート２ｋ−２の先端延長部に、前記実施例１１における屈曲部２ｊ−３と同様に形成される屈曲部２ｋ−３に加え、前記実施例１０における断面Ｌ字状２ｉ−４と同様の断面Ｌ字状部２ｋ−４の突合せ部を形成し、該突合せ部によって形成されるフランジ状の円周部を、溶接Ｗ２によって接合した以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｋを得、冷却装置１ｋを、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 FIG. 13 is an enlarged view of the main part of the present example, which belongs to another embodiment according to the present invention, and does not use an adapter ring as a thermal barrier part, and heats the tube sheet and / or casing. FIG. 13 shows a twelfth embodiment for forming a barrier portion. In the twelfth embodiment in FIG. 13, the distal end extension of the tube sheet 2k-2 is similar to the bent portion 2j-3 in the eleventh embodiment. In addition to the bent portion 2k-3 to be formed, a butt portion of the cross-section L-shaped portion 2k-4 similar to the cross-section L-shape 2i-4 in the tenth embodiment is formed, and a flange shape formed by the butt portion of the circumference, except for using welded W 2, to give the EGR gas cooling device 1k in the same manner as in example 1, the cooling device 1k, the EGR gas recirculation system under the same conditions as in example 1 As a result of being subjected to the cooling test, the same excellent results as in Example 1 were confirmed.
図１４において、シェル本体２ｌと触媒コンバーター用ケーシング４ｌとの接合に、再びアダプターリング５ｌを用いる、本発明に係る第１３実施例を要部を拡大して示し、図１４においては、シェル本体２ｌにろう付されたチューブシート２ｌ−２の先端に、軸心方向における断面形状が略Ｌ字形状にアダプターリング５ｌを溶接Ｗ１によって予め固着し、前記ケーシング４ｌの先端を同じく略Ｌ字状４ｌ−４に形成し、上記実施例１０における突合せフランジ部と同様、そのフランジ状の円周部を溶接Ｗ２によって接合した以外は、上記実施例１と同様にしてＥＧＲガス冷却装置１ｌを得、冷却装置１ｌを、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 In FIG. 14, the main part of the thirteenth embodiment according to the present invention, in which the adapter ring 5l is used again for joining the shell body 21 and the catalytic converter casing 4l, is shown enlarged. In FIG. the distal end of the tube sheet 2l-2, labeled Jiro, previously secured by the adapter ring welding 5l W 1 cross-sectional shape in the axial direction is substantially L-shaped, similarly approximately L-shaped 4l the distal end of the casing 4l forming -4, similar to the flange portion abutting in example 10 above, except that by joining circumferential portions of the flange-shaped by welding W 2, to give the EGR gas cooling device 1l in the same manner as in example 1, As a result of subjecting the cooling device 1l to a cooling test in the EGR gas recirculation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
図１５において、シェル本体２ｍと触媒コンバーター用ケーシング４ｍとの接合に、再びアダプターリング５ｍを用いる、本発明に係る第１４実施例とを要部を拡大して示し、図１５においては、前記実施例１３におけるアダプターリング５ｌと同様のアダプターリング５ｍに、熱障壁部となる薄肉部５ｍ−３を形成した以外は、実質的に上記実施例１３と同様にしてＥＧＲガス冷却装置１ｍを得、冷却装置１ｍを、実施例１と同一の条件でＥＧＲガス再循環システムにおける冷却試験に供した結果、実施例１と同じく優れた成果が確認された。 In FIG. 15, a 14th embodiment according to the present invention, in which the adapter ring 5m is used again for joining the shell main body 2m and the catalytic converter casing 4m, is shown in an enlarged manner. In FIG. An EGR gas cooling device 1m was obtained in substantially the same manner as in Example 13 except that a thin wall portion 5m-3 serving as a thermal barrier portion was formed on the adapter ring 5m similar to the adapter ring 5l in Example 13, and cooled. As a result of subjecting the apparatus 1m to a cooling test in the EGR gas recirculation system under the same conditions as in Example 1, the same excellent results as in Example 1 were confirmed.
本発明におけるＥＧＲ冷却装置の前部構造における溶接手順、具体的にはシェル本体とチューブシート、チューブシートまたはシェル本体とアダプターリング、アダプターリングとケーシング、シェル本体とケーシングとの溶接による接合が、任意の状態で選択される場合を含めて検討されるが、通常好ましい手順としては、図１６に例示するように、シェル本体側での接合を先行させ、アダプターを介してのケーシングの接合が、最終工程となるようにすることが手順の容易性と、ろう付部分の保護、或いは触媒コンバーターに内蔵される酸化触媒を保護する上で望ましい。なお、本発明においてＥＧＲガス冷却装置を構成する各部材については、耐熱性と耐食性に優れると共に、一定の機械的強度を有する金属製素材であれば任意であるが、好ましくはＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌなどから選択されるオーステナイト系ステンレススチールからなり、その板厚が０．０５〜１．０ｍｍの範囲の中から適宜に採用することが望ましい。また、各部材の加工方法についても特に制限しないが通常は鍛造、鋳造、削り出し、プレス成形などの手段により製造される。なお、多管式熱交換器で例示したがプレートタイプ熱交換器など種々のタイプの熱交換器にも使用可能であることはいうまでもない。 The welding procedure in the front structure of the EGR cooling device in the present invention, specifically, the shell body and tube sheet, the tube sheet or shell body and adapter ring, the adapter ring and casing, and the shell body and casing are joined by welding. However, as shown in FIG. 16, it is preferable to precede the joining on the shell body side and to join the casing through the adapter. In order to facilitate the procedure and protect the brazed portion or the oxidation catalyst incorporated in the catalytic converter, it is desirable to be a process. In addition, about each member which comprises an EGR gas cooling device in this invention, while being excellent in heat resistance and corrosion resistance, while being a metal raw material which has fixed mechanical strength, it is arbitrary, Preferably SUS304, SUS304L, SUS316 It is desirable to use austenitic stainless steel selected from SUS316L and the like, and to adopt the thickness appropriately from the range of 0.05 to 1.0 mm. Also, the processing method of each member is not particularly limited, but is usually manufactured by means such as forging, casting, machining, press molding and the like. In addition, although illustrated by the multi-tube heat exchanger, it cannot be overemphasized that it can be used also for various types of heat exchangers, such as a plate type heat exchanger.
上記各実施例からも明らかなように、本発明によるＥＧＲガス冷却装置は、シェル本体におけるチューブシートとの接合部と、該チューブシートと伝熱管両端部の接合部、或いはシェル本体とボンネットとの接合部等が、ろう付溶接を問わずに高い信頼性を以って保護されると同時に、シェル本体におけるＥＧＲガス流路の上流側ボンネットを延長し、その内周面に各種触媒を担持させた触媒コンバーターを内蔵し、溶接によって一体として接合するに際し、溶接部の熱の伝達を阻止する熱障壁部を設けることによって、チューブシートとシェル本体並びにチューブシートとチューブとのろう付部を保護すること、及び該コンバーターに担持された各種触媒の触媒活性を健全な状態で保護することを可能とし、排気ガス再循環燃焼システムを構成するＥＧＲクーラーを始めとする各種部材が、長期間に渉って機能することができるため当該産業分野において、幅広く採用されることが期待できる。 As is clear from the above embodiments, the EGR gas cooling device according to the present invention includes a joint between the shell body and the tube sheet, a joint between the tube sheet and both ends of the heat transfer tube, or a shell body and a bonnet. Joints are protected with high reliability regardless of brazing welding, and at the same time, the upstream bonnet of the EGR gas flow path in the shell body is extended, and various catalysts are supported on the inner peripheral surface. When the catalytic converter is built in and joined together by welding, a heat barrier is provided to prevent the heat transfer of the welded part, thereby protecting the brazed part of the tube sheet and the shell body and the tube sheet and the tube. And the catalytic activity of various catalysts carried by the converter can be protected in a healthy state, and an exhaust gas recirculation combustion system is provided. Various members including the EGR cooler to be formed is, in the industry because it can serve Te Wataru' a long period of time, it can be expected to be widely adopted.
１、１ａ、１ｂ、１ｃ、１ｄ、１ｅ、１ｆ、１ｇ、
１ｈ、１ｉ、１ｊ、１ｋ、１ｌ、１ｍ ＥＧＲガス冷却装置
２、２ａ、２ｂ、２ｃ、２ｄ、２ｅ、２ｆ、２ｇ、
２ｈ、２ｉ、２ｊ、２ｋ、２ｌ、２ｍ シェル本体
２−１、２−２、２ａ−２、２ｂ−２、２ｃ−２、２ｄ−２、
２ｅ−２、２ｆ−２、２ｇ−２、２ｈ−２、２ｉ−２、２ｊ−２、２ｋ−２、２ｌ−２、２ｍ−２ チューブシート
３ ボンネット
３−１、３−２ フランジ
４、４ａ、４ｂ、４ｃ、４ｄ、４ｅ、４ｆ、４ｇ、４ｈ、４ｉ、
４ｊ、４ｋ、４ｌ、４ｍ 触媒コンバーター用ケーシング
５、５ａ、５ｂ、５ｃ、５ｄ、５ｅ、５ｆ、５ｇ、５ｈ、
５ｌ、５ｍ アダプターリング
６、６ａ、６ｂ、６ｃ、６ｄ、６ｅ、６ｆ、６ｇ、６ｈ、６ｉ、
６ｊ、６ｋ、６ｌ、６ｍ 触媒コンバーター
７ 伝熱管
イ、ロ、ハ、ニ、ホ、ヘ ろう付部
Ｗ１、Ｗ２ 溶接部
ｃ−１ 冷却媒体入口
ｃ−２ 冷却媒体出口
ｇ−１ ＥＧＲガス流入口
ｇ−２ ＥＧＲガス流出口
1, 1a, 1b, 1c, 1d, 1e, 1f, 1g,
1h, 1i, 1j, 1k, 1l, 1m EGR gas cooling device 2, 2a, 2b, 2c, 2d, 2e, 2f, 2g,
2h, 2i, 2j, 2k, 2l, 2m shell body 2-1, 2-2, 2a-2, 2b-2, 2c-2, 2d-2,
2e-2, 2f-2, 2g-2, 2h-2, 2i-2, 2j-2, 2k-2, 2l-2, 2m-2 Tube sheet 3 Bonnet 3-1, 3-2 Flange 4, 4a 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i,
4j, 4k, 4l, 4m Catalytic converter casing 5, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h,
5l, 5m adapter ring 6, 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i,
6j, 6k, 6l, 6 m catalytic converter 7 Dennetsukan'i, B, C, D, E, with F brazing section W 1, W 2 weld c-1 coolant c-2 cooling medium outlet g-1 EGR gas Inlet g-2 EGR gas outlet
Claims (6)
The EGR gas cooling device according to any one of claims 1 to 5, wherein the adapter ring is a cylindrical body.
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| JP2005264496A JP4931390B2 (en) | 2005-09-12 | 2005-09-12 | EGR gas cooling device |
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