JP4525989B2 - EGR gas cooling device - Google Patents
EGR gas cooling device Download PDFInfo
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- JP4525989B2 JP4525989B2 JP30093298A JP30093298A JP4525989B2 JP 4525989 B2 JP4525989 B2 JP 4525989B2 JP 30093298 A JP30093298 A JP 30093298A JP 30093298 A JP30093298 A JP 30093298A JP 4525989 B2 JP4525989 B2 JP 4525989B2
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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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１０、図１１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１１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、かかる接合構造の場合、胴管１１の両開口端部と端部キャップ１４ａ、１４ｂおよびチューブシート１３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胴管１１内の冷却媒体（エンジンの冷却液など）が図１１中矢印で示すように水洩れが発生すると、端部キャップ１４ａ、１４ｂのガス流入口１４ａ−１または流出口１４ｂ−１側へ漏洩して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の重大原因となる。
【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ろう付け部からの水洩れによるエンジン故障やエンジン損傷の問題を解決するためになされたもので、胴管、チューブシートおよび端部キャップの接合構造を改善することによって、万一水洩れが発生してもエンジンに全く影響をおよぼさない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、かつ端部キャップの胴管側端部と胴管の端部キャップ側端部とが近接して固着された構造の多管式のＥＧＲガス冷却装置において、冷却媒体流入口を有する胴管の両端部と冷却媒体流入口を有しないチューブシートおよび端部キャップの接合構造として、開口端部を拡径した断面カップ形で薄肉のチューブシートを用い、胴管の両端部および端部キャップをそれぞれ前記カップ形のチューブシートに固着する接合構造であって、一方の前記カップ形チューブシートは、当該開口端部の拡径部が内向きになるように胴管の端部に前記拡径部が外嵌されて当該部分が固着され、さらに該チューブシートの背面側原径部外周端部に前記端部キャップが外嵌されて固着され、他方の前記カップ形チューブシートは、当該開口端部の拡径部が外向きになるように当該チューブシートの背面側原径部外周端部が胴管の端部を拡径して設けた拡径部に内嵌されて当該部分が固着され、さらに該チューブシートの拡径部の内面側に前記端部キャップが内嵌されて固着され、前記一方のチューブシートと胴管の外側接合部と、チューブシートと端部キャップの外側接合部が管軸方向に、前記他方のチューブシートと胴管の外側接合部と、チューブシートと端部キャップの外側接合部が管軸方向および径方向に、それぞれ離間した構造となしたＥＧＲガス冷却装置を要旨とするものである。
また、本発明は、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、かつ端部キャップの胴管側端部の固着部と胴管の端部キャップ側端部の固着部が近接して設けられた構造の多管式のＥＧＲガス冷却装置において、冷却媒体流入口を有する胴管の両端部と冷却媒体流入口を有しないチューブシートおよび端部キャップの接合構造として、開口端部を拡径した断面カップ形で薄肉のチューブシートを用い、胴管の両端部および端部キャップをそれぞれ前記カップ形のチューブシートに固着する接合構造であって、両方の前記カップ形チューブシートは、それぞれ当該開口端部の拡径部が内向きになるように胴管の端部に前記拡径部が外嵌されて当該部分が固着され、各チューブシートの背面側原径部外周端部にそれぞれ前記端部キャップが外嵌されて固着され、胴管の両端部とチューブシートの外側接合部と、チューブシートと端部キャップの外側接合部がそれぞれ管軸方向に離間した構造となしたＥＧＲガス冷却装置をもう一つの要旨とするものである。
【０００８】
すなわち、本発明は胴管、チューブシートおよび端部キャップのろう付け部に万一亀裂が生じても、胴管内の冷却媒体（エンジンの冷却液など）のエンジン内部への侵入を防止するため、胴管の両端部とチューブシートの接合部と、チューブシートと端部キャップの接合部をそれぞれ分離させた構造としたもので、これによりチューブシートと端部キャップの接合部に亀裂が生じても胴管内の冷却媒体が当該亀裂部から漏洩することが全くないばかりでなく、胴管の両端部とチューブシートの接合部に亀裂が生じても胴管内の冷却媒体は装置外へ漏出するだけなので、端部キャップのガス流入口または流出口側内部への漏洩を完全に防止することができる。
【０００９】
【発明の実施の形態】
図１は本発明に係る多管式のＥＧＲガス冷却装置の一実施例を、図２〜図９は本発明に係る多管式のＥＧＲガス冷却装置の参考例を、それぞれ示すもので、図１は開口端部を拡径した断面カップ形で薄肉のチューブシートを用いた、胴管、チューブシートおよび端部キャップの接合構造の一実施例を示すＥＧＲガス流入口側および流出口側の断面図、図２〜図８は断面コ字形またはカップ形のチューブシートを用いた、胴管、チューブシートおよび端部キャップの接合構造の参考例を示すＥＧＲガス流入口側および流出口側の断面図、図９は厚肉のチューブシートを用いた胴管、チューブシートおよび端部キャップの接合構造の参考例を示す図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、３ａ〜３ｉ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。
【００１０】
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、開口端部を拡径した断面カップ形で薄肉のチューブシート３ａ、３ａ´を用い、胴管１の一方（図１の左側）は前記チューブシート３ａをその開口端部の拡径部が内向きになるように、また胴管１の他方（図１の右側）は前記チューブシート３ａと同一の形状構造を有するチューブシート３ａ′をその開口端部の拡径部が外向きになるようにそれぞれ配置し、この両端部のチューブシート３ａ、３ａ´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している。また、図示のように、チューブシート３ａ、３ａ′をその開口端部の拡径部がそれぞれ内向き、外向きになるように非対称に配置した構造の場合は、内向きのチューブシート３ａの開口端部の拡径部を胴管１の端部に外嵌して当該部分をろう付けまたは溶接により固着し、当該チューブシート３ａの背面側原径部外周端部にはＥＧＲガスの流入口４−１、流出口４−２が設けられた端部キャップ４を外嵌して当該部分をろう付けまたは溶接により固着し、一方、外向きのチューブシート３ａ′側は、胴管１の他端部を拡径して設けた拡径部にチューブシート３ａ′の背面側原径部外周端部を内嵌して当該部分をろう付けまたは溶接により固着し、また該チューブシート３ａ′の拡径部の内面側に端部キャップ４を内嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、胴管１の両端部とチューブシート３ａ、３ａ′の接合部イと、チューブシート３ａ、３ａ′と端部キャップ４の接合部ロとが分離した構造となしている。
そしてこのような構造とするとＥＧＲガス冷却装置の各部のろう付けの際にチューブシート３ａ側を下側にして樹立させてろう材を外周側に配置してろう付け作業をすれば溶融したろう材が流下しても各接合部のろう付けは確実に実施することができる。
なおこの図１の接合構造におけるチューブシート３ａ、３ａ′側を相互に内向きあるいは相互に外向きに対向して配置して対称的に胴管１や端部キャップ４にそれぞれ固着することも可能である。
【００１１】
次に、図２〜図９に参考例として示す多管式のＥＧＲガス冷却装置について説明する。
図２に示す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、両端部にそれぞれ内向きに配置したカップ形のチューブシート３ｂ（拡径部なし）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している。一方、チューブシート３ｂはその外周部もしくは内周部（図示せず）の開口端部を胴管１の両端内壁もしくは外壁に内嵌して当該部分をろう付けまたは溶接により固着している。また、前記チューブシート３ｂの背面側（外側）の外周端部にはＥＧＲガスの流入口４−１、流出口４−２が設けられた端部キャップ４が外嵌されて当該部分をろう付けまたは溶接により固着され、前記胴管１の両端内壁もしくは外壁とチューブシート３ｂの接合部イと、チューブシート３ｂと端部キャップ４の接合部ロとが分離した構造となしている。なお、胴管１の両端内壁とチューブシート３ｂの接合部イでは、胴管１の外周面とチューブシート３ｂａの外周面をそれぞれ面一に設けているが、胴管１はチューブシート３ｂの外周面に突出させて接合してもよいことはいうまでもない。
【００１２】
図３に示すＥＧＲガス冷却装置は、図２の接合構造と同様、カップ形のチューブシート３ｃを内向きに配置した例であり、この場合はチューブシート３ｃを胴管１の両端内壁に嵌合して当該部分をろう付けまたは溶接により固着し、端部キャップ４はチューブシート３ｃに外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図１と同様、胴管１の両端内壁とチューブシート３ｃの接合部イと、チューブシート３ｃと端部キャップ４の接合部ロとが分離した構造となしている。なお、チューブシート３ｃと端部キャップ４の接合部ロでは、チューブシート３ｃの外周面と端部キャップ４の外周面をそれぞれ面一に設けているが、端部キャップ４はチューブシート３ｃの外周面に突出させて接合してもよいことはいうまでもない。
【００１３】
図４に示すＥＧＲガス冷却装置は、図２、図３の接合構造と同様、カップ形のチューブシート３ｄを内向きに配置した例であり、この場合はチューブシート３ｄを胴管１の両端部に外嵌して当該部分をろう付けまたは溶接により固着し、端部キャップ４はチューブシート３ｄに外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図１と同様、胴管１の両端外壁とチューブシート３ｄの接合部イと、チューブシート３ｄと端部キャップ４の接合部ロとが分離した構造となしている。
【００１４】
上記図２〜図４はいずれもカップ形のチューブシートを内向きに配置した例であるのに対し、以下に説明する図５〜図８はいずれもカップ形のチューブシートを図２〜図４とは向きが逆の外向きに配置した例である。
すなわち、図５に示すＥＧＲガス冷却装置は、外向きに配置したカップ形のチューブシート３ｅの背面側外周端部に胴管１の両端を外嵌して当該部分をろう付けまたは溶接により固着し、端部キャップ４はチューブシート３ｅの外周面と面一に外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図１〜図４と同様、胴管１の両端部とチューブシート３ｅの接合部イと、チューブシート３ｅと端部キャップ４の接合部ロとが分離した構造となしている。なお、端部キャップ４はチューブシート３ｅの外周面と面一でなく、チューブシート３ｅの外周面に突出するように外嵌して接合してもよいことはいうまでもない。
【００１５】
図６に示すＥＧＲガス冷却装置は、外向きに配置した側壁に膨出部を有するカップ形のチューブシート３ｆの背面側外周端部を胴管１の両端内壁に面一に内嵌して当該部分をろう付けまたは溶接により固着し、また該チューブシート３ｆの開口端側外周端部に端部キャップ４を面一に外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図５と同様、胴管１の両端内壁とチューブシート３ｆの接合部イと、チューブシート３ｆと端部キャップ４の接合部ロとが分離した構造となしている。なお、この図６の接合構造において、胴管１の両端内壁とチューブシート３ｆの接合部イと、チューブシート３ｆと端部キャップ４の接合部ロは共に、胴管１、チューブシート３ｆおよび端部キャップ４の外周面をそれぞれ面一に設けているが、必ずしも面一でなくてもよい。また、チューブシート３ｆは外向きのみならず、内向きに配置することも可能である。
【００１６】
図７に示すＥＧＲガス冷却装置は、外向きに配置したカップ形のチューブシート３ｇの背面側外周端部を胴管１の両端部に内嵌して当該部分をろう付けまたは溶接により固着し、また該チューブシート３ｇの開口端部に端部キャップ４を内嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図５、図６と同様、胴管１の両端内壁とチューブシート３ｇの接合部イと、チューブシート３ｇと端部キャップ４の接合部ロとが分離した構造となしている。
なお図７において胴管１の両端部または一端部を図４の右側に示すように拡径しこの拡径部をチューブシート３ｇの背面側外周端部に外嵌して固着することもできる。
【００１７】
図８に示すＥＧＲガス冷却装置は、外向きに配置したカップ形のチューブシート３ｈの背面側外周端部を胴管１の両端部に面一に内嵌して当該部分をろう付けまたは溶接により固着し、また該チューブシート３ｈの開口側外周端部に端部キャップ４を外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も図５、図６、図７と同様、胴管１の両端部とチューブシート３ｈの接合部イと、チューブシート３ｈと端部キャップ４の接合部ロとが分離した構造となしている。
【００１８】
一方、図９に示すＥＧＲガス冷却装置は、カップ形のチューブシートに替えて、厚肉のチューブシート３ｉを使用し、この厚肉チューブシート３ｉの胴管１側外周端部に胴管１の両端を外嵌して当該部分をろう付けまたは溶接により固着し、端部キャップ４はチューブシート３ｉの外周面と面一に外嵌して当該部分をろう付けまたは溶接により固着した構造となしたもので、この場合も胴管１の両端内壁とチューブシート３ｉの接合部イと、チューブシート３ｉと端部キャップ４の接合部ロとが分離した構造となしている。なお、胴管１はチューブシート３ｉの外周面と面一に外嵌して接合してもよいことはいうまでもない。
【００１９】
上記した図１〜図９に示す各ＥＧＲガス冷却装置において、仮に胴管１の両端内壁とチューブシート３ａ〜３ｉの接合部イに亀裂が入るなど何等かの理由により水洩れが生じた場合、この接合部イはチューブシート３ａ〜３ｉと端部キャップ４の接合部ロと離れた位置にあるため、接合部イから洩れた水はそのまま外部へ漏出し、端部キャップ４内へ侵入することはない。また、チューブシート３ａ〜３ｉと端部キャップ４の接合部ロは胴管１内部と完全に隔離した位置にあるため、仮に当該接合部ロに亀裂などが生じても水洩れは皆無である。
【００２０】
なお図１〜図８では、チューブシートとしてカップ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に替えて、断面形状がコ字形のチューブシートを用いても同様の作用効果が得られることはいうまでもない。また、カップ形やコ字形のチューブシートは鍛造、鋳造、削り出し、プレス成形などの手段により製造される。
【００２１】
【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、冷却媒体流入口を有する胴管の両端部と冷却媒体流入口を有しないチューブシートの接合部と、チューブシートと端部キャップの接合部をそれぞれ分離させた構造としたことにより、チューブシートと端部キャップの接合部にたとえ亀裂が生じても胴管内の冷却媒体が当該亀裂部から漏洩することが全くないばかりか、胴管の両端部とチューブシートの接合部に亀裂が生じても胴管内の冷却媒体は装置外へ漏出するので、胴管内の冷却媒体（エンジンの冷却液など）のエンジン内部への侵入を完全に防止することができるという大なる効果を奏する。
【図面の簡単な説明】
【図１】 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、開口端部を拡径した断面カップ形で薄肉のチューブシートを用いた、胴管、チューブシートおよび端部キャップの接合構造の一実施例を示すＥＧＲガス流入口および流出口側の断面図である。
【図２】 本発明に係る多管式のＥＧＲガス冷却装置の参考例を示し、カップ形のチューブシートを内向きに用いた、胴管、チューブシートおよび端部キャップの接合構造を示す図１相当図である。
【図３】 同じくカップ形のチューブシートを内向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図４】 同じくカップ形のチューブシートを内向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図５】 同じくカップ形のチューブシートを外向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図６】 同じくカップ形のチューブシートを外向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図７】 同じくカップ形のチューブシートを外向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図８】 同じくカップ形のチューブシートを外向きに用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図９】 厚肉のチューブシートを用いた、胴管、チューブシートおよび端部キャップの接合構造の他の参考例を示す図１相当図である。
【図１０】 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中央部を省略して示す横断平面図である。
【図１１】 同上装置の胴管、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。
【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
３ａ〜３ｉ 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. 10 and FIG. 11, 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. Construction It has become.
[0005]
[Problems to be solved by the invention]
As shown in an enlarged view of FIG. 11, the trunk tube 11, the sheet metal tube sheet 13, and the end caps 14 a and 14 b in the conventional multi-tube heat exchanger used for cooling the EGR gas are shown in FIG. 11, the tube sheet 13 is fixed between the end caps 14a and 14b by brazing in the furnace. And the end caps 14a and 14b and the brazed portion of the tube sheet 13 are cracked due to any cause, for example, poor brazing in the manufacturing stage, vibration or shock, and the like. When a water leak occurs as indicated by an arrow in FIG. 11, it leaks to the gas inlet 14a-1 or outlet 14b-1 side of the end caps 14a, 14b and mixes with EGR gas. A significant cause of invading engine failure or engine damage within the engine and.
[0006]
The present invention has been made to solve the problem of engine failure and engine damage due to water leakage from the brazed part due to the joining structure of the trunk tube, tube sheet and end cap of the above-described multi-tube heat exchanger. Therefore, by improving the joint structure of the trunk tube, tube sheet, and end cap, it is intended to provide an EGR gas cooling device that does not affect the engine at all even if water leaks. is there.
[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 a trunk pipe provided with a cooling medium inlet and a cooling medium outlet at both ends, End caps are provided at both ends of the trunk tube, and EGR gas inlets and outlets are provided at the end caps, and at the outer opening ends of the gas inlets and outlets of the end caps. In a multi-tube EGR gas cooling apparatus having a structure in which a fastening flange is fixedly fitted to the outside and an end cap side end portion of an end cap and an end cap side end portion of the end tube are fixed in close proximity to each other, As the joining structure of the tube sheet having no medium inlet and the tube sheet not having the cooling medium inlet and the end cap, a cross-sectional cup-shaped thin tube sheet having an enlarged opening end is used. Both ends and end key Each of the cup-shaped tube sheets is fixed to the cup-shaped tube sheet, and the cup-shaped tube sheet is arranged at the end of the trunk tube so that the diameter-expanded portion of the opening end is inward. The enlarged diameter portion is externally fitted and the portion is fixed, and the end cap is externally fitted and fixed to the outer peripheral end portion of the back side original diameter portion of the tube sheet, and the other cup-shaped tube sheet is The outer diameter end portion of the back side of the tube sheet is fitted into the enlarged diameter portion provided by expanding the end portion of the tube so that the enlarged diameter portion of the opening end portion faces outward. Further, the end cap is fitted and fixed to the inner surface side of the diameter-expanded portion of the tube sheet, and the one tube sheet and the outer joint of the trunk tube, and the outer joint of the tube sheet and the end cap The other tube case in the tube axis direction. Doo and the outer joint portion of the cylinder tube, the outer joint portion of the tubesheet and the end cap to the tube axis and the radial direction, in which the EGR gas cooling device without the respective spaced structure gist.
In the present invention , the heat transfer tube group is fixedly arranged on a tube sheet fixed in the vicinity of both ends of the trunk pipe provided with the cooling medium inlet and the cooling medium outlet at both ends, and further, the both ends of the trunk pipe The end cap is provided with an EGR gas inlet and outlet, and a fastening flange is provided at the outer opening end of the gas inlet and outlet of the end cap. In a multi-tube type EGR gas cooling device that is fitted and fixed, and has a structure in which a fixing portion of the end cap side end portion of the end cap and a fixing portion of the end cap side end portion of the trunk tube are provided close to each other. As the joining structure of the tube sheet having no medium inlet and the tube sheet not having the cooling medium inlet and the end cap, a cross-sectional cup-shaped thin tube sheet having an enlarged opening end is used. Both ends and end caps Each of the cup-shaped tube sheets is bonded to the cup-shaped tube sheet, and both of the cup-shaped tube sheets are expanded at the end of the trunk tube so that the diameter-expanded portion of the opening end is inward. The diameter part is externally fitted and the part is fixed, and the end cap is externally fitted and fixed to the outer peripheral end part of the back side original diameter part of each tube sheet. Another aspect of the present invention is an EGR gas cooling device in which the outer joint portion of the tube portion and the tube cap and the end cap are separated from each other in the tube axis direction.
[0008]
That is, in the present invention, even if a crack occurs in the brazed portion of the trunk tube, the tube sheet, and the end cap, in order to prevent the cooling medium (engine coolant, etc.) in the trunk tube from entering the engine, It has a structure in which the joint part of the tube tube and the joint part of the tube sheet and the joint part of the tube sheet and the end cap are separated from each other, so that even if a crack occurs in the joint part of the tube sheet and the end cap Not only does the cooling medium in the trunk pipe leak from the crack, but the cooling medium in the trunk pipe only leaks out of the device even if cracks occur at both ends of the trunk pipe and the joint between the tube sheets. Further, it is possible to completely prevent the end cap from leaking into the gas inlet or outlet side.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a multi-tube EGR gas cooling device according to the present invention, and FIGS. 2 to 9 show reference examples of the multi-tube EGR gas cooling device according to the present invention. 1 is an EGR gas inlet side and outlet side cross section showing an embodiment of a joining structure of a trunk tube, a tube sheet, and an end cap using a thin tube sheet having a cup-shaped cross section with an enlarged opening end. FIGS. 2 to 8 are sectional views of an EGR gas inlet side and outlet side showing a reference example of a joining structure of a trunk tube, a tube sheet, and an end cap using a U-shaped or cup-shaped tube sheet. 9 is a view corresponding to FIG. 1 showing a reference example of a joining structure of a trunk tube, a tube sheet, and an end cap using a thick tube sheet, 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, 3a to 3i are tube sheets, 4 is an end cap, 4-1 is an EGR gas inlet, 4-2 is an EGR gas outlet, and 5 is a fastening flange.
[0010]
First, the multi-tube EGR gas cooling device of the present invention shown in FIG. 1 has an open end portion inside a trunk tube 1 provided with a cooling medium inlet 1-1 and a cooling medium outlet 1-2 at both ends. Using tube cups 3a and 3a 'having an enlarged cross-sectional cup shape and a thin wall, one of the trunk tubes 1 (the left side in FIG. 1) is arranged so that the enlarged diameter portion of the open end of the tube sheet 3a faces inward. Further, the other tube tube 1 (the right side in FIG. 1) has a tube sheet 3a 'having the same shape and structure as the tube sheet 3a, with the enlarged end portion of the opening end thereof facing outward, Both ends of the heat transfer tube group 2 are fixed to the tube sheets 3a and 3a 'at both ends by brazing or welding. Further, as shown in the figure, in the case where the tube sheets 3a and 3a 'are asymmetrically arranged so that the enlarged diameter portions of the opening ends are inward and outward, respectively, the opening of the inwardly facing tube sheet 3a is provided. The enlarged diameter portion of the end portion is externally fitted to the end portion of the trunk tube 1 and the portion is fixed by brazing or welding, and an EGR gas inlet 4 is provided at the outer peripheral end portion of the back side original diameter portion of the tube sheet 3a. -1, end cap 4 provided with outlet 4-2 is externally fitted and the part is fixed by brazing or welding, while the outward tube sheet 3a 'side is the other end of trunk 1 The outer diameter end of the back side of the tube sheet 3a ′ is fitted into the enlarged diameter portion provided by expanding the diameter of the tube sheet 3a ′, and the portion is fixed by brazing or welding, and the diameter of the tube sheet 3a ′ is increased. The end cap 4 is fitted on the inner surface side of the part and the part is brazed Or, it has a structure that is fixed by welding, so that the both ends of the trunk tube 1 and the joints a of the tube sheets 3a and 3a 'and the joints b of the tube sheets 3a and 3a' and the end cap 4 are separated. And has a structure.
And if it is such a structure, when brazing each part of an EGR gas cooling device, it will be established with the tube sheet 3a side down, and the brazing material will be placed on the outer peripheral side and the brazing material will be melted. Even if it flows down, the brazing of each joint can be carried out reliably.
In addition, the tube sheets 3a and 3a 'in the joining structure of FIG. 1 can be arranged to face each other inwardly or outwardly from each other and symmetrically fixed to the trunk tube 1 and the end cap 4, respectively. It is.
[0011]
Next, a multi-tube EGR gas cooling apparatus shown as a reference example in FIGS. 2 to 9 will be described.
The EGR gas cooling apparatus shown in FIG. 2 is a cup-shaped tube that is disposed inward 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 sheet 3b (no expanded diameter portion) by brazing or welding. On the other hand, the tube sheet 3b has an open end portion of an outer peripheral portion or an inner peripheral portion (not shown) fitted into both inner walls or outer walls of the body tube 1, and the portion is fixed by brazing or welding. An end cap 4 provided with an EGR gas inlet 4-1 and an outlet 4-2 is fitted on the outer peripheral end of the back side (outer side) of the tube sheet 3b to braze the part. Alternatively, it is fixed by welding so that the inner wall or outer wall of both ends of the body tube 1 and the joint portion (b) of the tube sheet 3b and the joint portion (b) of the tube sheet 3b and the end cap 4 are separated. In addition, although the outer peripheral surface of the trunk tube 1 and the outer peripheral surface of the tube sheet 3ba are each provided in the joint part a of the both ends inner wall of the trunk tube 1 and the tube sheet 3b, the trunk tube 1 is the outer periphery of the tube sheet 3b. Needless to say, the protrusions may be joined to the surface.
[0012]
The EGR gas cooling device shown in FIG. 3 is an example in which a cup-shaped tube sheet 3c is disposed inward as in the joining structure of FIG. 2, and in this case, the tube sheet 3c is fitted to the inner walls at both ends of the trunk tube 1 Then, the part is fixed by brazing or welding, and the end cap 4 is externally fitted to the tube sheet 3c so that the part is fixed by brazing or welding. , and it forms a junction b at both ends inner wall of the cylinder tube 1 and the tube sheet 3c, a structure in which the junction b is separated tubesheet 3c and the end cap 4. In the junction B of the tubesheet 3c and the end cap 4, it is provided with the outer peripheral surface and the outer peripheral surface of the end cap 4 of the tube sheet 3c each flush, the end cap 4 of the tube sheet 3c periphery Needless to say, the protrusions may be joined to the surface.
[0013]
The EGR gas cooling device shown in FIG. 4 is an example in which a cup-shaped tube sheet 3d is disposed inward as in the joint structure of FIGS. 2 and 3 , and in this case, the tube sheet 3d is disposed at both ends of the body tube 1. Figure the parts and fixed by brazing or welding fitted, the end cap 4 which was without a structure which is fixed by brazing or welding the portion fitted to the tube sheet 3d, also in this case 1 similarly to, and forms a junction b at both ends walls and tube sheet 3d of the body tube 1, a structure in which the junction b is separated tubesheet 3d and the end cap 4.
[0014]
FIG 2 to FIG 4 while are examples arranged inwardly of the tube sheet of any cup, 5-8 2-4 Both the tubesheet of cup-shaped as described below Is an example in which the orientation is reversed outward.
In other words, the EGR gas cooling device shown in FIG. 5 is configured such that both ends of the body tube 1 are externally fitted to the outer peripheral end portion of the back side of the cup-shaped tube sheet 3e arranged outwardly, and the portion is fixed by brazing or welding. The end cap 4 has a structure in which the outer periphery of the tube sheet 3e is flush with the outer peripheral surface, and the portion is fixed by brazing or welding. In this case as well, as in FIGS. 1 has a structure in which the joint portion A between the tube sheet 3e and the tube sheet 3e and the joint portion b between the tube sheet 3e and the end cap 4 are separated. Needless to say, the end cap 4 is not flush with the outer peripheral surface of the tube sheet 3e but may be externally fitted so as to protrude from the outer peripheral surface of the tube sheet 3e.
[0015]
The EGR gas cooling device shown in FIG. 6 is configured such that the outer peripheral end of the back side of the cup-shaped tube sheet 3f having a bulging portion on the side wall disposed outwardly is flush with the inner walls at both ends of the trunk tube 1. The part is fixed by brazing or welding, and the end cap 4 is fitted on the outer peripheral end of the tube sheet 3f on the opening end side so that the part is fixed by brazing or welding. In this case as well, as in FIG. 5, the inner wall at both ends of the trunk tube 1 and the joint portion a between the tube sheet 3f and the joint portion b between the tube sheet 3f and the end cap 4 are separated. In the joining structure of FIG. 6, both the inner wall of both ends of the trunk tube 1 and the joint portion a of the tube sheet 3f and the joint portion b of the tube sheet 3f and the end cap 4 are both the trunk tube 1, the tube sheet 3f and the end. Although the outer peripheral surfaces of the part caps 4 are provided flush with each other, they are not necessarily flush. Further, the tube sheet 3f can be arranged not only outward but also inward.
[0016]
The EGR gas cooling device shown in FIG. 7 has the outer peripheral end portion on the back side of the cup-shaped tube sheet 3g arranged outwardly fitted to both end portions of the trunk tube 1, and the portion is fixed by brazing or welding, Further, the end cap 4 is fitted into the open end of the tube sheet 3g and the portion is fixed by brazing or welding. In this case as well, as in FIGS. In this structure, the inner wall of both ends and the joint portion (b) of the tube sheet 3g and the joint portion (b) of the tube sheet 3g and the end cap 4 are separated.
In FIG. 7, both end portions or one end portion of the body tube 1 can be expanded as shown on the right side of FIG. 4, and the expanded portion can be externally fitted and fixed to the outer peripheral end portion on the back side of the tube sheet 3g.
[0017]
The EGR gas cooling device shown in FIG. 8 has a back-side outer peripheral end portion of a cup-shaped tube sheet 3h arranged outwardly fitted to both ends of the trunk tube 1 in a flush manner, and the portion is brazed or welded. In addition, the end cap 4 is externally fitted to the opening side outer peripheral end of the tube sheet 3h, and the portion is fixed by brazing or welding. In this case as well, FIG. As in FIG. 7, the structure is such that both end portions of the body tube 1 and the joint portion a of the tube sheet 3 h and the joint portion b of the tube sheet 3 h and the end cap 4 are separated.
[0018]
On the other hand, the EGR gas cooling apparatus shown in FIG. 9 uses a thick tube sheet 3i instead of the cup-shaped tube sheet, and the thick tube sheet 3i has a tube 1 at the outer peripheral end of the tube 1 side. Both ends are externally fitted and the part is fixed by brazing or welding, and the end cap 4 is externally fitted flush with the outer peripheral surface of the tube sheet 3i and the part is fixed by brazing or welding. In this case as well, the inner wall at both ends of the body tube 1 and the joint portion a between the tube sheet 3i and the joint portion b between the tube sheet 3i and the end cap 4 are separated. Needless to say, the body tube 1 may be externally fitted and joined to the outer peripheral surface of the tube sheet 3i.
[0019]
In each of the EGR gas cooling devices shown in FIGS. 1 to 9 described above, if water leakage occurs due to any reason such as a crack in the inner wall of both ends of the trunk tube 1 and the joint portion a of the tube sheets 3a to 3i, Since this joint part i is located at a position away from the joint part b between the tube sheets 3a to 3i and the end cap 4, the water leaking from the joint part a leaks to the outside as it is and enters the end cap 4. There is no. Further, since the joint portion b between the tube sheets 3a to 3i and the end cap 4 is located at a position completely separated from the inside of the trunk tube 1, even if a crack or the like occurs in the joint portion b, there is no water leakage.
[0020]
In addition, although the cup-shaped thing was demonstrated as an example in FIGS. 1-8, it replaces with a cup-shaped tube sheet, and the same effect is obtained even if it uses a tube sheet whose cross-sectional shape is a U-shape. Needless to say. In addition, cup-shaped and U-shaped tube sheets are produced by means such as forging, casting, machining, and press molding.
[0021]
【The invention's effect】
As described above, the EGR gas cooling device of the present invention includes both the end portions of the trunk pipe having the cooling medium inlet, the joining portion of the tube sheet not having the cooling medium inlet, and the joining portion of the tube sheet and the end cap. Due to the separated structure, even if a crack occurs in the joint between the tube sheet and the end cap, the cooling medium in the trunk does not leak at all from the crack, and both ends of the trunk Even if a crack occurs in the joint between the tube sheet and the tube sheet, the cooling medium in the trunk pipe leaks out of the device, so that it is possible to completely prevent the cooling medium in the trunk pipe (such as engine coolant) from entering the engine. There is a great effect that you can.
[Brief description of the drawings]
FIG. 1 exemplifies a structure of a multi-tube EGR gas cooling device according to the present invention, and includes a trunk tube, a tube sheet and an end using a thin tube sheet having a cup-shaped cross section with an enlarged opening end. It is sectional drawing by the side of the EGR gas inflow port and outflow port which shows one Example of the joining structure of a part cap.
FIG. 2 shows a reference example of a multi-tube EGR gas cooling apparatus according to the present invention, and shows a joining structure of a trunk tube, a tube sheet, and an end cap using a cup-shaped tube sheet facing inward . It is an equivalent figure.
FIG. 3 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, which similarly uses a cup-shaped tube sheet inward.
FIG. 4 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, which similarly uses a cup-shaped tube sheet inward.
FIG. 5 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, similarly using a cup-shaped tube sheet facing outward.
FIG. 6 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, similarly using a cup-shaped tube sheet facing outward.
FIG. 7 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, similarly using a cup-shaped tube sheet facing outward.
FIG. 8 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap, similarly using a cup-shaped tube sheet facing outward.
FIG. 9 is a view corresponding to FIG. 1 and showing another reference example of a joining structure of a trunk tube, a tube sheet, and an end cap using a thick tube sheet.
FIG. 10 is a cross-sectional plan view showing an example of a conventional multi-tube EGR gas cooling device that is the subject of the present invention, with the central portion omitted.
FIG. 11 is an enlarged cross-sectional view illustrating a joint portion of the trunk tube, the tube sheet, and the end cap of the apparatus.
[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 3a-3i Tube sheet 4 End cap 4-1 EGR gas inflow port 4-2 EGR gas outflow port 5 Fastening flange
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30093298A JP4525989B2 (en) | 1998-06-05 | 1998-10-22 | EGR gas cooling device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-173990 | 1998-06-05 | ||
| JP17399098 | 1998-06-05 | ||
| JP30093298A JP4525989B2 (en) | 1998-06-05 | 1998-10-22 | EGR gas cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000054916A JP2000054916A (en) | 2000-02-22 |
| JP4525989B2 true JP4525989B2 (en) | 2010-08-18 |
Family
ID=26495761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30093298A Expired - Fee Related JP4525989B2 (en) | 1998-06-05 | 1998-10-22 | EGR gas cooling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4525989B2 (en) |
Families Citing this family (7)
| 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 |
| US8069905B2 (en) | 2003-06-11 | 2011-12-06 | Usui Kokusai Sangyo Kaisha Limited | EGR gas cooling device |
| DE20316688U1 (en) * | 2003-10-29 | 2004-03-11 | Behr Gmbh & Co. Kg | heat exchangers |
| JP4931390B2 (en) * | 2005-09-12 | 2012-05-16 | 臼井国際産業株式会社 | EGR gas cooling device |
| FR2933178A1 (en) * | 2008-06-26 | 2010-01-01 | Valeo Systemes Thermiques | HEAT EXCHANGER AND CARTER FOR THE EXCHANGER |
| JP5321271B2 (en) | 2009-06-17 | 2013-10-23 | 株式会社デンソー | Heat exchanger for high temperature gas cooling |
| DE102015210942A1 (en) * | 2015-06-15 | 2016-12-15 | Mahle International Gmbh | Heat exchanger |
-
1998
- 1998-10-22 JP JP30093298A patent/JP4525989B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000054916A (en) | 2000-02-22 |
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