JP5426154B2 - Piping joint structure - Google Patents

Piping joint structure Download PDF

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JP5426154B2
JP5426154B2 JP2008323404A JP2008323404A JP5426154B2 JP 5426154 B2 JP5426154 B2 JP 5426154B2 JP 2008323404 A JP2008323404 A JP 2008323404A JP 2008323404 A JP2008323404 A JP 2008323404A JP 5426154 B2 JP5426154 B2 JP 5426154B2
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pipe
downstream
upstream
flange
flanges
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JP2010144849A (en
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稔 小和田
宏 築坂
功 大原
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Hino Motors Ltd
Isuzu Motors Ltd
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Hino Motors Ltd
Isuzu Motors Ltd
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本発明は、ミスト分を含むガスを内部に流す配管の継手構造に関するものである。   The present invention relates to a joint structure for piping that allows a gas containing mist to flow inside.

従来より、ディーゼルエンジンにおいては、排気ガスが流通する排気管の途中に、酸素共存下でも選択的にＮＯxを還元剤と反応させる性質を備えた選択還元型触媒を装備し、該選択還元型触媒の上流側に必要量の還元剤を添加して該還元剤を選択還元型触媒上で排気ガス中のＮＯx（窒素酸化物）と還元反応させ、これによりＮＯxの排出濃度を低減し得るようにしたものがある。   Conventionally, a diesel engine is equipped with a selective reduction catalyst having a property of selectively reacting NOx with a reducing agent even in the presence of oxygen in the middle of an exhaust pipe through which exhaust gas flows, and the selective reduction catalyst A required amount of a reducing agent is added to the upstream side of the catalyst so that the reducing agent undergoes a reduction reaction with NOx (nitrogen oxide) in the exhaust gas on the selective catalytic reduction catalyst, thereby reducing the NOx emission concentration. There is what I did.

他方、プラント等における工業的な排煙脱硝処理の分野では、還元剤にアンモニア（ＮＨ3）を用いてＮＯxを還元浄化する手法の有効性が既に広く知られているところであるが、自動車の場合には、アンモニアそのものを搭載して走行することに関し安全確保が困難であるため、近年においては、毒性のない尿素水を還元剤として使用することが提案されている（例えば、特許文献１参照）。 On the other hand, in the field of industrial flue gas denitration treatment in plants and the like, the effectiveness of a method for reducing and purifying NOx using ammonia (NH 3 ) as a reducing agent is already widely known. Since it is difficult to ensure safety with respect to traveling with ammonia itself, in recent years, it has been proposed to use non-toxic urea water as a reducing agent (see, for example, Patent Document 1). .

即ち、尿素水を選択還元型触媒の上流側で排気ガス中に添加すれば、該排気ガス中で尿素水が次式によりアンモニアと炭酸ガスに熱分解され、選択還元型触媒上で排気ガス中のＮＯxがアンモニアにより良好に還元浄化されることになる。
［化１］
（ＮＨ2）2ＣＯ＋Ｈ2Ｏ→２ＮＨ3＋ＣＯ2 That is, if urea water is added to the exhaust gas upstream of the selective catalytic reduction catalyst, the urea water in the exhaust gas is thermally decomposed into ammonia and carbon dioxide gas by the following formula, and the exhaust gas is exhausted on the selective catalytic reduction catalyst. NOx is reduced and purified well by ammonia.
[Chemical 1]
(NH 2 ) 2 CO + H 2 O → 2NH 3 + CO 2

この際、排気ガス中に添加された尿素水がアンモニアと炭酸ガスに熱分解されるまでの十分な反応時間を確保するため、尿素水の添加位置から選択還元型触媒までの間は、所要長さの排気管で接続され、この排気管の内部には、尿素水のミスト分を含む排気ガスが流れることになる。   At this time, in order to secure a sufficient reaction time until the urea water added to the exhaust gas is thermally decomposed into ammonia and carbon dioxide, the required length from the urea water addition position to the selective catalytic reduction catalyst is required. In this exhaust pipe, exhaust gas containing urea water mist flows.

図３は尿素水のミスト分を含む排気ガス１を内部に流すようにした排気管２，３の継手構造を示しており、ここに図示している例では、上流側の排気管２の最下流端にフランジサポート４を介して配設されたフランジ５と、下流側の排気管３の最上流端にフランジサポート６を介して配設されたフランジ７とをボルト８及びナット９によりガスケット１０を挟んだ上で締結するようにしている。   FIG. 3 shows a joint structure of the exhaust pipes 2 and 3 in which the exhaust gas 1 containing the mist content of urea water is caused to flow inside. In the example shown here, the most upstream exhaust pipe 2 is shown. A flange 5 disposed at the downstream end via a flange support 4 and a flange 7 disposed at the most upstream end of the downstream exhaust pipe 3 via a flange support 6 are connected to a gasket 10 by bolts 8 and nuts 9. It is made to conclude after pinching.

ここで、前記各フランジサポート４，６は、各排気管２，３の主構造を成す配管本体２ａ，３ａの端部に外嵌装着されて前記各排気管２，３の先端部分を構成するスリーブ部４ａ，６ａと、該スリーブ部４ａ，６ａの接続相手側端で配管本体２ａ，３ａの半径方向外側へ屈曲して締結時の合わせ面を形成し且つその背面側にフランジ５，７を装着するようにした鍔部４ｂ，６ｂとから成る薄肉の板金部品となっている。   Here, the flange supports 4 and 6 are externally fitted to the end portions of the pipe main bodies 2a and 3a constituting the main structure of the exhaust pipes 2 and 3 to constitute the tip portions of the exhaust pipes 2 and 3, respectively. The sleeve portions 4a, 6a, and the connecting mating ends of the sleeve portions 4a, 6a are bent outward in the radial direction of the pipe bodies 2a, 3a to form a mating surface at the time of fastening, and flanges 5, 7 are provided on the back side thereof. It is a thin sheet metal part composed of the flanges 4b, 6b to be mounted.

尚、このようなフランジサポート４，６を用いているのは、厚肉のフランジ５，７を薄肉の配管本体２ａ，３ａに直に溶接した場合よりも溶接歪みが小さくなることと、肉厚のフランジ５，７を尿素水による腐食を考慮した高価な耐食性素材としなくて済むことを意図しているからである。
特開２００８−１９６３２８号公報 Such flange supports 4 and 6 are used because the weld distortion is smaller than when the thick flanges 5 and 7 are directly welded to the thin pipe main bodies 2a and 3a, and the thickness is increased. This is because the flanges 5 and 7 are intended not to be expensive corrosion-resistant materials in consideration of corrosion by urea water.
JP 2008-196328 A

しかしながら、図３に示す如き配管継手構造では、フランジ５，７相互の合わせ面が流路内で排気ガス１の流れに直接晒された状態となってしまい、尿素水のミスト分が前記合わせ面に流入し易く、また、排気ガス１の流れに乗りきれずに流路内の底部に溜まる尿素水の液滴もフランジ５，７相互の合わせ面の谷部に集まり易いという問題があり、浸透性の高い尿素水がボルト８の緩み等を要因として外部に滲み出て周辺部品を腐食してしまう虞れがあった。   However, in the pipe joint structure as shown in FIG. 3, the mating surfaces of the flanges 5 and 7 are directly exposed to the flow of the exhaust gas 1 in the flow path, and the mist content of urea water becomes the mating surface. In addition, there is a problem that urea water droplets that cannot easily catch the flow of the exhaust gas 1 and collect at the bottom of the flow path easily collect in the valleys of the mating surfaces of the flanges 5 and 7. There is a possibility that highly-pure urea water oozes out to the outside due to loosening of the bolts 8 and corrodes peripheral parts.

本発明は上述の実情に鑑みてなしたもので、ミスト分を含むガスを内部に流す配管の継手箇所における液漏れを防止することを目的としている。   This invention is made | formed in view of the above-mentioned situation, and it aims at preventing the liquid leak in the joint location of the piping which flows the gas containing a mist part inside.

本発明は、ミスト分を含むガスを内部に流す配管の継手構造であって、上流側の配管の端部を下流側の配管の端部に差し込む形式とし、上流側の配管の最下流端から上流側へ所要長さ遡った位置に第一フランジを配設し且つ下流側の配管の最上流端に第二フランジを配設して第一及び第二フランジの相互を締結し、第一フランジよりも下流側へ延在する上流側の配管の張出部分により第一及び第二フランジの相互の合わせ面を内周側から被覆し、上流側の配管の張出部分と下流側の配管の内周面との間に、ラビリンス構造を成す流入抵抗体を全周に亘り配設し、下流側の配管における上流側の配管の最下流端が入り込む位置よりも下流側で且つ該位置に近い位置に、排気ガスの流れに乗りきれずに底部に溜まった液滴を収容してフランジ相互の合わせ面への遡りを防ぐ窪み部を形成したことを特徴とするものである。
The present invention is a pipe joint structure for flowing a gas containing mist to the inside, wherein the end of the upstream pipe is inserted into the end of the downstream pipe, from the most downstream end of the upstream pipe. A first flange is disposed at a position retroactive to the upstream side, and a second flange is disposed at the most upstream end of the downstream pipe to fasten the first and second flanges together. Covering the mating surfaces of the first and second flanges from the inner peripheral side with the upstream pipe extension extending further downstream than the upstream pipe extension and the downstream pipe. An inflow resistor having a labyrinth structure is arranged over the entire circumference between the inner peripheral surface and the downstream side of the downstream side of the downstream side of the upstream side of the downstream side of the pipe, and closer to the position. In the position, the droplets that cannot reach the exhaust gas flow and collect at the bottom are accommodated. To the formation of the recess prevent dating back to the mating surface and is characterized in.

而して、このようにすれば、上流側の配管の張出部分により第一及び第二フランジの相互の合わせ面が内周側から被覆されることになるので、フランジ相互の合わせ面が流路内で排気ガスの流れに直接晒されなくなり、ガス中のミスト分が前記合わせ面に流入しなくなる。   Thus, in this way, the mating surfaces of the first and second flanges are covered from the inner peripheral side by the projecting portion of the upstream pipe, so that the mating surfaces of the flanges flow. It is not directly exposed to the flow of exhaust gas in the road, and mist in the gas does not flow into the mating surface.

また、上流側の配管内で排気ガスの流れに乗りきれずに底部に溜まった液滴も、排気ガスの流れに押し流されて下流側へ移動する際に、上流側の配管の張出部分によりフランジ相互の合わせ面を乗り越えて下流側の配管へ導かれるため、フランジ相互の合わせ面に集まらなくなる。   In addition, when the liquid droplets accumulated at the bottom of the upstream pipe that cannot reach the exhaust gas flow are pushed away by the exhaust gas flow and moved downstream, Since it passes over the mating surfaces of the flanges and is guided to the downstream pipe, it does not collect on the mating surfaces of the flanges.

尚、下流側の配管内で排気ガスの流れに乗りきれずに底部に溜まった液滴は、排気ガスの流れによりそのまま下流側へ送り出されるが、仮に上流側へ向かって下り勾配となっているような場合であっても、液滴が窪み部に溜められることになるため、液滴がフランジ相互の合わせ面に遡ることはない。
In addition, the liquid droplets accumulated at the bottom without being able to ride the exhaust gas flow in the downstream pipe are sent to the downstream side as they are due to the exhaust gas flow, but temporarily have a downward slope toward the upstream side. Even in such a case, since the liquid droplets are accumulated in the depressions, the liquid droplets do not trace back to the mating surfaces of the flanges.

しかも、上流側の配管の張出部分と下流側の配管の内周面との間に、ラビリンス構造を成す流入抵抗体を全周に亘り配設しているので、フランジ相互の合わせ面へのミスト分や液滴の流入をより確実に阻むことが可能となる。
 In addition, since an inflow resistor that forms a labyrinth structure is arranged over the entire circumference between the upstream pipe overhanging part and the downstream pipe inner peripheral surface, It becomes possible to more reliably prevent the inflow of mist and droplets.

更に、本発明においては、前記上流側の配管の最下流端から上流側へ所要長さ遡った位置に第一のフランジサポートを介して前記第一フランジを配設し且つ前記下流側の配管の最上流端に前記第二のフランジサポートを介して前記第二フランジを配設して前記第一及び第二フランジの相互を締結した配管継手構造であって、前記第二のフランジサポートの最下流端は、前記上流側の配管の最下流端より下流側に配置され、前記液溜め用の窪み部は、前記下流側の配管の前記第二のフランジサポートの最下流端より下流側に形成されていることが好ましい。
Further, in the present invention, the first flange is disposed via a first flange support at a position retroactive to a required length from the most downstream end of the upstream pipe to the upstream side, and the downstream pipe A pipe joint structure in which the second flange is disposed at the most upstream end via the second flange support and the first and second flanges are fastened to each other, and the most downstream of the second flange support The end is disposed on the downstream side of the most downstream end of the upstream side pipe, and the recess for reservoir is formed on the downstream side of the most downstream end of the second flange support of the downstream side pipe. It is preferable.

上記した本発明の配管継手構造によれば、下記の如き種々の優れた効果を奏し得る。   According to the pipe joint structure of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）上流側の配管の張出部分により第一及び第二フランジの相互の合わせ面を内周側から被覆したことによって、フランジ相互の合わせ面へのミスト分の流入や液滴の溜まりを回避することができ、ボルトの緩み等を要因として配管の継手箇所に液漏れが生じる虞れを防止することができる。   (I) By covering the mating surfaces of the first and second flanges from the inner peripheral side with the projecting portion of the upstream pipe, inflow of mist and accumulation of droplets on the mating surfaces of the flanges can be prevented. It is possible to avoid this, and it is possible to prevent the possibility of liquid leakage at the joints of the piping due to loosening of the bolts or the like.

（ＩＩ）上流側の配管の張出部分と下流側の配管の内周面との間に、ラビリンス構造を成す流入抵抗体を全周に亘り配設しているので、フランジ相互の合わせ面へのミスト分や液滴の流入をより確実に阻むことができる。
(II) between the inner peripheral surface of the projecting portion and the downstream-side piping on the upstream side of the pipe, since the inflow resistor constituting a labyrinth structure is disposed over the entire circumference, the mating surfaces of the flange each other It is possible to more reliably prevent the inflow of mist and droplets.

（ＩＩＩ）下流側の配管における上流側の配管の最下流端が入り込む位置よりも下流側で且つ該位置に近い位置に、排気ガスの流れに乗りきれずに底部に溜まった液滴を収容してフランジ相互の合わせ面への遡りを防ぐ窪み部を形成しているので、上流側へ向かって下り勾配となっているような特殊なケースであっても、窪み部に液滴を溜めて該液滴をフランジ相互の合わせ面に遡らせないようにすることができる。
(III) In the downstream pipe, the liquid droplets accumulated at the bottom without being able to get through the exhaust gas flow are accommodated at a position downstream of and closer to the position where the most downstream end of the upstream pipe enters. In this case, even in a special case that has a downward slope toward the upstream side, liquid droplets are accumulated in the recess and It is possible to prevent the droplets from going back to the mating surfaces of the flanges.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明を実施する形態の一例を示すもので、図３と同一の符号を付した部分は同一物を表わしている。   FIG. 1 shows an example of an embodiment for carrying out the present invention, and the parts denoted by the same reference numerals as those in FIG. 3 represent the same items.

図１に示す如く、本形態例においては、尿素水のミスト分を含む排気ガス１を内部に流す排気管２，３同士を接続するにあたり、上流側の排気管２の端部を下流側の排気管３の端部に差し込む形式を採用しており、上流側の排気管２の最下流端から上流側へ所要長さ遡った位置にフランジサポート４を介してフランジ５を配設すると共に、下流側の排気管３の最上流端にフランジサポート６を介してフランジ７を配設し、これらフランジ５，７の相互をボルト８及びナット９によりガスケット１０を挟んだ上で締結することにより、フランジ５よりも下流側へ延在する上流側の排気管２の張出部分２ｂによりフランジ５，７の相互の合わせ面を内周側から被覆させるようにしている。   As shown in FIG. 1, in this embodiment, when connecting the exhaust pipes 2 and 3 for flowing the exhaust gas 1 containing the mist of urea water to the inside, the end of the upstream exhaust pipe 2 is connected to the downstream side. A type that is inserted into the end of the exhaust pipe 3 is adopted, and a flange 5 is disposed via a flange support 4 at a position retroactive to the upstream side from the most downstream end of the exhaust pipe 2 on the upstream side, A flange 7 is disposed at the most upstream end of the downstream exhaust pipe 3 via a flange support 6, and the flanges 5, 7 are fastened with a gasket 10 sandwiched between bolts 8 and nuts 9. The mating surfaces of the flanges 5 and 7 are covered from the inner peripheral side by the protruding portion 2b of the upstream side exhaust pipe 2 extending downstream from the flange 5.

また、特に本形態例においては、上流側の排気管２の張出部分２ｂと、下流側の排気管３におけるフランジサポート６のスリーブ部６ａ内周面との間に、ラビリンス構造を成す流入抵抗体として、ワイヤーメッシュ１１を全周に亘り配設している。このワイヤーメッシュ１１は、例えば、上流側の排気管２の張出部分２ｂにおける外周部に予め装着しておけば良い。   Particularly in the present embodiment, an inflow resistance that forms a labyrinth structure between the projecting portion 2b of the upstream exhaust pipe 2 and the inner peripheral surface of the sleeve portion 6a of the flange support 6 in the downstream exhaust pipe 3 is provided. As a body, the wire mesh 11 is arranged over the entire circumference. For example, the wire mesh 11 may be attached in advance to the outer peripheral portion of the projecting portion 2 b of the upstream exhaust pipe 2.

更に、下流側の排気管３における上流側の排気管２の最下流端が入り込む位置よりも下流側で且つ該位置に近い位置には、排気ガス１の流れに乗りきれずに底部に溜まった液滴を収容してフランジ５，７相互の合わせ面への遡りを防ぐ窪み部１２を形成しており、より具体的には、前記上流側の排気管２の最下流端より下流側にフランジサポート６の最下流端が配置され、このフランジサポート６の最下流端より下流側に前記液溜め用の窪み部１２が形成されている。この窪み部１２は、少なくとも各排気管２，３の据え付け時に下側となる部位に形成すれば良いが、据え付け姿勢の制約を受けないよう下流側の排気管３の全周に形成されていても良い。
Further, in the downstream exhaust pipe 3, the downstream end of the upstream exhaust pipe 2 is located downstream from the position where the upstream exhaust pipe 2 enters and close to the position, and the exhaust gas 1 cannot be completely covered with the flow of the exhaust gas 1 and accumulated at the bottom. A recess 12 is formed to store the droplets and prevent the flanges 5 and 7 from going back to the mating surfaces. More specifically, the flange is formed downstream of the most downstream end of the upstream exhaust pipe 2. The most downstream end of the support 6 is disposed, and the liquid reservoir recess 12 is formed on the downstream side of the most downstream end of the flange support 6. The depression 12 may be formed at least on the lower portion when the exhaust pipes 2 and 3 are installed, but is formed on the entire circumference of the downstream exhaust pipe 3 so as not to be restricted by the installation posture. Also good.

而して、このように排気管２，３の継手構造を構成すれば、上流側の排気管２の張出部分２ｂによりフランジ５，７の相互の合わせ面が内周側から被覆されることになるので、フランジ５，７相互の合わせ面が流路内で排気ガス１の流れに直接晒されなくなり、排気ガス１中に含まれる尿素水のミスト分が前記合わせ面に流入しなくなる。   Thus, when the joint structure of the exhaust pipes 2 and 3 is configured in this way, the mating surfaces of the flanges 5 and 7 are covered from the inner peripheral side by the protruding portion 2b of the exhaust pipe 2 on the upstream side. Therefore, the mating surfaces of the flanges 5 and 7 are not directly exposed to the flow of the exhaust gas 1 in the flow path, and the urea water mist contained in the exhaust gas 1 does not flow into the mating surface.

また、上流側の排気管２内で排気ガス１の流れに乗りきれずに底部に溜まった液滴も、排気ガス１の流れに押し流されて下流側へ移動する際に、上流側の排気管２の張出部分２ｂによりフランジ５，７相互の合わせ面を乗り越えて下流側の排気管３へ導かれるため、フランジ５，７相互の合わせ面に集まらなくなる。   Further, when the liquid droplets accumulated at the bottom without being able to ride the exhaust gas flow 1 in the upstream exhaust pipe 2 are pushed away by the flow of the exhaust gas 1 and move downstream, the upstream exhaust pipe 2 Since the two overhanging portions 2b get over the mating surfaces of the flanges 5 and 7 and are guided to the exhaust pipe 3 on the downstream side, they do not collect on the mating surfaces of the flanges 5 and 7.

尚、下流側の排気管３内で排気ガス１の流れに乗りきれずに底部に溜まった液滴は、排気ガス１の流れによりそのまま下流側へ送り出されるが、仮に上流側へ向かって下り勾配となっているような場合であっても、液滴が窪み部１２に溜められることになるため、液滴がフランジ５，７相互の合わせ面に遡ることはない。   In addition, the liquid droplets accumulated in the bottom without being able to ride the exhaust gas 1 flow in the downstream exhaust pipe 3 are sent to the downstream side as they are due to the flow of the exhaust gas 1, but temporarily descend toward the upstream side. Even in such a case, since the liquid droplets are accumulated in the recess 12, the liquid droplets do not go back to the mating surfaces of the flanges 5 and 7.

更に、本形態例の場合は、上流側の排気管２の張出部分２ｂと、下流側の排気管３におけるフランジサポート６のスリーブ部６ａ内周面との間に、ワイヤーメッシュ１１を全周に亘り配設しているので、フランジ５，７相互の合わせ面への尿素水のミスト分や液滴の流入をより確実に阻むことが可能となる。   Further, in the case of the present embodiment, the wire mesh 11 is placed between the protruding portion 2b of the upstream exhaust pipe 2 and the inner peripheral surface of the sleeve portion 6a of the flange support 6 in the downstream exhaust pipe 3. Therefore, it is possible to more reliably prevent urea water mist and droplets from flowing into the mating surfaces of the flanges 5 and 7.

特に流入抵抗体としてワイヤーメッシュ１１は好適であり、この種のワイヤーメッシュ１１には、単にラビリンス構造を成してシール性を向上するというだけでなく、拡縮性を有しているという特徴があるため、製作精度や組み付け精度のバラツキ、熱膨張等といった要素を吸収し易く、また、そのメッシュ構造によりミスト分に対する高いトラップ機能を発揮させることも可能である。   In particular, the wire mesh 11 is suitable as an inflow resistor, and this type of wire mesh 11 has a feature that it has not only a labyrinth structure but improved sealing performance, but also has expandability. Therefore, it is easy to absorb factors such as variations in manufacturing accuracy and assembly accuracy, thermal expansion, and the like, and it is also possible to exhibit a high trap function for mist due to the mesh structure.

従って、上記形態例によれば、上流側の排気管２の張出部分２ｂによりフランジ５，７の相互の合わせ面を内周側から被覆したことによって、フランジ５，７相互の合わせ面へのミスト分の流入や液滴の溜まりを回避することができ、ボルト８の緩み等を要因として排気管２，３の継手箇所に液漏れが生じる虞れを防止することができる。   Therefore, according to the above-mentioned embodiment, the mutual mating surfaces of the flanges 5 and 7 are covered from the inner peripheral side by the projecting portion 2b of the exhaust pipe 2 on the upstream side. Inflow of mist and accumulation of droplets can be avoided, and it is possible to prevent the possibility of liquid leakage at the joints of the exhaust pipes 2 and 3 due to loosening of the bolts 8 and the like.

また、上流側の排気管２の張出部分２ｂと、下流側の排気管３におけるフランジサポート６のスリーブ部６ａ内周面との間に、ワイヤーメッシュ１１を全周に亘り配設しているので、フランジ５，７相互の合わせ面への尿素水のミスト分や液滴の流入をより確実に阻むことができる。   Further, the wire mesh 11 is disposed over the entire circumference between the projecting portion 2b of the upstream exhaust pipe 2 and the inner peripheral surface of the sleeve portion 6a of the flange support 6 in the downstream exhaust pipe 3. Therefore, it is possible to more reliably prevent urea water mist and droplets from flowing into the mating surfaces of the flanges 5 and 7.

更に、下流側の排気管３における上流側の排気管２の最下流端が入り込む位置よりも下流側で且つ該位置に近い位置に、排気ガス１の流れに乗りきれずに底部に溜まった液滴を収容してフランジ５，７相互の合わせ面への遡りを防ぐ窪み部１２を形成しているので、上流側へ向かって下り勾配となっているような特殊なケースであっても、窪み部１２に液滴を溜めて該液滴をフランジ５，７相互の合わせ面に遡らせないようにすることができる。
Further, the liquid that has accumulated at the bottom without being able to ride the flow of the exhaust gas 1 at a position closer to the downstream side than the position where the most downstream end of the upstream side exhaust pipe 2 enters the downstream side exhaust pipe 3. Since the recess 12 is formed to store the droplets and prevent the flanges 5 and 7 from going back to the mating surfaces, the recesses are formed even in a special case having a downward slope toward the upstream side. The liquid droplets can be accumulated in the portion 12 so that the liquid droplets do not go back to the mating surfaces of the flanges 5 and 7.

図２は本発明の配管継手構造の参考例を示すもので、上流側の排気管２の張出部分２ｂと、下流側の排気管３におけるフランジサポート６のスリーブ部６ａ内周面との間にワイヤーメッシュ１１を配設することに替えて、上流側の排気管２の張出部分２ｂにおける最下流端にフレア形状１３を付したものであり、このようにすることによっても、尿素水のミスト分や液滴がフランジ５，７相互の合わせ面へ流入し難くすることが可能である。
FIG. 2 shows a reference example of the pipe joint structure of the present invention. Between the protruding portion 2b of the upstream exhaust pipe 2 and the inner peripheral surface of the sleeve portion 6a of the flange support 6 in the downstream exhaust pipe 3. Instead of arranging the wire mesh 11, the flare shape 13 is added to the most downstream end of the projecting portion 2b of the upstream exhaust pipe 2, and by doing so, the urea water is also provided. It is possible to make it difficult for mist and droplets to flow into the mating surfaces of the flanges 5 and 7.

尚、本発明の配管継手構造は、上述の形態例にのみ限定されるものではなく、尿素水をミスト状に添加された排気ガスを内部に流す排気管への適用に限定されないこと、また、流入抵抗体はワイヤーメッシュに限定されないこと、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, the pipe joint structure of the present invention is not limited only to the above-described embodiment, and is not limited to application to an exhaust pipe through which exhaust gas added with urea water in a mist form flows. Of course, the inflow resistor is not limited to a wire mesh, and various modifications can be made without departing from the scope of the present invention.

本発明を実施する形態の一例を示す断面図である。It is sectional drawing which shows an example of the form which implements this invention. 本発明の配管継手構造の参考例を示す断面図である。It is sectional drawing which shows the reference example of the piping joint structure of this invention. 従来例を示す断面図である。It is sectional drawing which shows a prior art example.

符号の説明Explanation of symbols

１ 排気ガス（ガス）
２ 排気管（配管）
２ｂ 張出部分
３ 排気管（配管）
４ フランジサポート（第一のフランジサポート）
５ フランジ（第一フランジ）
６ フランジサポート（第二のフランジサポート）
７ フランジ（第二フランジ）
８ ボルト
９ ナット
１１ ワイヤーメッシュ（流入抵抗体）
１２ 窪み部 1 Exhaust gas (gas)
2 Exhaust pipe (pipe)
2b Overhang 3 Exhaust pipe (pipe)
4 Flange support (first flange support)
5 Flange (first flange)
6 Flange support (second flange support)
7 Flange (second flange)
8 bolts 9 nuts 11 wire mesh (inflow resistor)
12 Indentation

Claims (2)

ミスト分を含むガスを内部に流す配管の継手構造であって、
上流側の配管の端部を下流側の配管の端部に差し込む形式とし、
上流側の配管の最下流端から上流側へ所要長さ遡った位置に第一フランジを配設し且つ下流側の配管の最上流端に第二フランジを配設して第一及び第二フランジの相互を締結し、
第一フランジよりも下流側へ延在する上流側の配管の張出部分により第一及び第二フランジの相互の合わせ面を内周側から被覆し、
上流側の配管の張出部分と下流側の配管の内周面との間に、ラビリンス構造を成す流入抵抗体を全周に亘り配設し、
下流側の配管における上流側の配管の最下流端が入り込む位置よりも下流側で且つ該位置に近い位置に、排気ガスの流れに乗りきれずに底部に溜まった液滴を収容してフランジ相互の合わせ面への遡りを防ぐ窪み部を形成したことを特徴とする配管継手構造。 A pipe joint structure for flowing a gas containing mist to the inside,
The end of the upstream pipe is inserted into the end of the downstream pipe,
A first flange is disposed at a position retroactive to a required length from the most downstream end of the upstream pipe to the upstream side, and a second flange is disposed at the most upstream end of the downstream pipe. Mutually signed
Covering the mating surfaces of the first and second flanges from the inner peripheral side by the projecting portion of the upstream pipe extending downstream from the first flange ,
Between the projecting portion of the upstream pipe and the inner peripheral surface of the downstream pipe, an inflow resistor having a labyrinth structure is arranged over the entire circumference.
In the downstream side pipe, the downstream side of the upstream side pipe of the upstream side pipe enters the downstream side and close to this position to store droplets accumulated at the bottom without being able to catch the exhaust gas flow and A pipe joint structure characterized in that a recess is formed to prevent going back to the mating surface . 前記上流側の配管の最下流端から上流側へ所要長さ遡った位置に第一のフランジサポートを介して前記第一フランジを配設し且つ前記下流側の配管の最上流端に前記第二のフランジサポートを介して前記第二フランジを配設して前記第一及び第二フランジの相互を締結した配管継手構造であって、
前記第二のフランジサポートの最下流端は、前記上流側の配管の最下流端より下流側に配置され、
前記液溜め用の窪み部は、前記下流側の配管の前記第二のフランジサポートの最下流端より下流側に形成されていることを特徴とする請求項１に記載の配管継手構造。 The first flange is disposed via a first flange support at a position retroactive to the upstream side from the most downstream end of the upstream pipe and the second flange is disposed at the most upstream end of the downstream pipe. A pipe joint structure in which the second flange is disposed through the flange support and the first and second flanges are fastened together,
The most downstream end of the second flange support is disposed on the downstream side of the most downstream end of the upstream pipe,
2. The pipe joint structure according to claim 1 , wherein the recess for collecting liquid is formed on a downstream side of a most downstream end of the second flange support of the pipe on the downstream side .
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