JP4397402B2 - Exhaust purification device - Google Patents

Exhaust purification device Download PDF

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Publication number
JP4397402B2
JP4397402B2 JP2007112153A JP2007112153A JP4397402B2 JP 4397402 B2 JP4397402 B2 JP 4397402B2 JP 2007112153 A JP2007112153 A JP 2007112153A JP 2007112153 A JP2007112153 A JP 2007112153A JP 4397402 B2 JP4397402 B2 JP 4397402B2
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reducing agent
exhaust
exhaust pipe
collision
exhaust gas
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JP2008267288A (en
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晋一郎 川北
圭司 大嶋
義明 西島
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Denso Corp
Soken Inc
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Denso Corp
Nippon Soken Inc
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Priority to JP2007112153A priority Critical patent/JP4397402B2/en
Priority to US12/104,566 priority patent/US20080256931A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

本発明は、エンジンの排ガスを還元剤により浄化する排気浄化装置に関する。   The present invention relates to an exhaust purification device that purifies exhaust gas from an engine with a reducing agent.

従来から、エンジンの排ガスに含まれる窒素酸化物（ＮＯｘ）を還元剤により還元して浄化する排気浄化装置が公知である。この還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。 2. Description of the Related Art Conventionally, exhaust gas purification apparatuses that reduce and purify nitrogen oxide (NO x ) contained in engine exhaust gas with a reducing agent are known. This reducing agent is, for example, urea water, and ammonia (NH 3 ) generated by decomposition of urea reacts with NO x by a catalyst to generate harmless nitrogen (N 2 ) and water (H 2 O). Thus, NO x is purified.

ところで、この排気浄化装置には、還元剤を噴射する添加弁と、噴射された還元剤を衝突により分散させる衝突分散機構とを備え、添加弁を排気管に直接装着するものがある（例えば、特許文献１参照）。この排気浄化装置によれば、添加弁の先端部は排気管の内部に突出し、還元剤は、この先端部に開口する噴孔から、直接、排気管の内部に噴射され、衝突分散機構により排ガス中に分散した後に触媒に導かれる。
このため、添加弁の先端部は、排ガスの直撃を受けて高温に加熱されるので、熱劣化したりデポジットが付着したりする虞がある。
特開２００６−２０７３９５号公報 By the way, this exhaust purification device includes an addition valve that injects a reducing agent and a collision dispersion mechanism that disperses the injected reducing agent by a collision, and the addition valve is directly attached to an exhaust pipe (for example, Patent Document 1). According to this exhaust gas purification apparatus, the tip of the addition valve protrudes into the exhaust pipe, and the reducing agent is directly injected into the exhaust pipe from the injection hole opened at the tip, and the exhaust gas is discharged by the collision dispersion mechanism. After being dispersed in, it is led to the catalyst.
For this reason, since the tip of the addition valve is heated to a high temperature by being directly hit by the exhaust gas, there is a risk of thermal degradation or deposits.
JP 2006-207395 A

本発明は、上記の問題点を解決するためになされたものであり、その目的は、エンジンの排ガスを還元剤により浄化する排気浄化装置において、添加弁への排ガスの直撃を回避することにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to avoid a direct hit of exhaust gas on an addition valve in an exhaust purification device that purifies exhaust gas of an engine with a reducing agent. .

〔請求項１の手段〕
請求項１に記載の排気浄化装置は、排ガスが通る排気管と、排気管の内部に還元剤を噴射する添加弁とを備え、噴孔の開口部を有する添加弁の先端部が、排気管の内周面よりも外周側に配された状態で排気管の内部に臨む。
これにより、添加弁の先端部は、排気管の内部に突出しない状態で排気管の内部に臨むことができる。このため、添加弁は、排ガスの直撃を回避しつつ、排気管の内部に還元剤を噴射することができる。 [Means of Claim 1]
The exhaust emission control device according to claim 1 is provided with an exhaust pipe through which exhaust gas passes and an addition valve for injecting a reducing agent into the exhaust pipe, and a tip portion of the addition valve having an opening of an injection hole is an exhaust pipe. It faces the inside of the exhaust pipe in a state of being arranged on the outer peripheral side with respect to the inner peripheral surface.
Thereby, the front-end | tip part of an addition valve can face the inside of an exhaust pipe in the state which does not protrude inside the exhaust pipe. For this reason, the addition valve can inject the reducing agent into the exhaust pipe while avoiding the direct hit of the exhaust gas.

また、排気浄化装置は、排気管の内部で還元剤の噴射方向と交差する位置に配され、噴射された還元剤の衝突を受けるとともに衝突した還元剤を排ガス中に分散させる衝突分散機構を備える。そして、衝突分散機構は、噴射された還元剤の衝突を受ける衝突板であり、衝突板との衝突により還元剤を排ガス中に分散させるとともに、排気管を直進してきた排ガスに衝突板を通過させることで排ガスの流れを旋回流に変換する。
これにより、還元剤噴霧の微粒化を促進することができるので、添加弁への排ガスの直撃を回避しながら、還元剤を排ガス中に効率的に分散させることができる。また、排ガスの流れを旋回流に変換することにより、還元剤の排ガス中への分散が、さらに効率的になる。 Further, the exhaust purification device is provided with a collision dispersion mechanism that is disposed at a position intersecting the injection direction of the reducing agent inside the exhaust pipe and receives the collision of the injected reducing agent and disperses the colliding reducing agent in the exhaust gas. The The collision dispersion mechanism is a collision plate that receives the collision of the injected reducing agent, and disperses the reducing agent in the exhaust gas due to the collision with the collision plate, and allows the exhaust plate that has traveled straight through the exhaust pipe to pass through the collision plate. This converts the flow of exhaust gas into a swirling flow.
Thereby, since atomization of the reducing agent spray can be promoted, the reducing agent can be efficiently dispersed in the exhaust gas while avoiding direct hit of the exhaust gas to the addition valve. Further, by converting the flow of the exhaust gas into a swirl flow, the reducing agent is more efficiently dispersed in the exhaust gas.

〔請求項２の手段〕
請求項２に記載の排気浄化装置によれば、添加弁は、排気管の管壁部と一体の装着部に装着される。
これにより、排気管の一部に添加弁および衝突分散機構を装備して、１つのモジュールを構成することができる。このため、添加弁および衝突分散機構の配置の自由度を高めることができる。 [Means of claim 2 ]
According to the exhaust purification device of the second aspect , the addition valve is mounted on the mounting portion integral with the tube wall portion of the exhaust pipe.
Thereby, a part of the exhaust pipe can be equipped with the addition valve and the collision dispersion mechanism to constitute one module. For this reason, the freedom degree of arrangement | positioning of an addition valve and a collision dispersion | distribution mechanism can be raised.

〔請求項３の手段〕
請求項３に記載の排気浄化装置によれば、添加弁は、排気管の軸方向に対して垂直に還元剤を噴射するように配され、衝突分散機構は、噴孔の開口部の直下に設けられている。また、衝突板は、９０度の中心角を有する略同一径の扇形板状の４つのフィンであり、４つのフィンは、添加弁が還元剤を噴射する方向を鉛直下方とみなすと、直進してきた排ガスの流れに垂直な排気管の内部断面を４等分した左上、右上、右下、左下の各々の領域に配されている。そして、左上のフィンおよび右下のフィンは、各々の扇形の２辺の内で左右方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられ、右上のフィンおよび左下のフィンは、各々、上下方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられている。
これにより、噴射された還元剤を確実に衝突分散機構に衝突させて分散効率を高めることができる。 [Means of claim 3]
According to the exhaust purification device of the third aspect, the addition valve is arranged so as to inject the reducing agent perpendicularly to the axial direction of the exhaust pipe, and the collision dispersion mechanism is located directly below the opening of the injection hole. Is provided. The impingement plate is four fan-shaped plate fins having a central angle of 90 degrees and substantially the same diameter, and the four fins go straight when the direction in which the addition valve injects the reducing agent is regarded as vertically downward. The exhaust pipe perpendicular to the flow of the exhaust gas is divided into four areas in the upper left, upper right, lower right, and lower left, respectively. The upper left fin and the lower right fin are provided so as to rotate and incline to the downstream side with one side parallel to the left-right direction as the rotation center among the two sides of each sector shape. The upper right fin and the lower left fin Are provided so as to be inclined to the downstream side with one side parallel to the vertical direction as the center of rotation.
Thereby, the injected reducing agent can be reliably caused to collide with the collision dispersion mechanism to increase the dispersion efficiency.

最良の形態１の排気浄化装置は、排ガスが通る排気管と、排気管の内部に還元剤を噴射する添加弁とを備え、噴孔の開口部を有する添加弁の先端部が、排気管の内周面よりも外周側に配された状態で排気管の内部に臨む。
また、この排気浄化装置は、排気管の内部で還元剤の噴射方向と交差する位置に配され、噴射された還元剤の衝突を受けるとともに衝突した還元剤を排ガス中に分散させる衝突分散機構を備える。
そして、衝突分散機構は、噴射された還元剤の衝突を受ける衝突板であり、衝突板との衝突により還元剤を排ガス中に分散させるとともに、排気管を直進してきた排ガスに衝突板を通過させることで排ガスの流れを旋回流に変換する。 The exhaust emission control device of the best mode 1 includes an exhaust pipe through which exhaust gas passes, and an addition valve that injects a reducing agent into the exhaust pipe, and the tip of the addition valve having an opening of an injection hole is provided on the exhaust pipe. It faces the inside of the exhaust pipe in a state of being arranged on the outer peripheral side with respect to the inner peripheral surface.
In addition, this exhaust purification device is arranged at a position intersecting the injection direction of the reducing agent inside the exhaust pipe, and receives a collision dispersion mechanism that receives the collision of the injected reducing agent and disperses the colliding reducing agent in the exhaust gas. Prepare.
The collision dispersion mechanism is a collision plate that receives the collision of the injected reducing agent, and disperses the reducing agent in the exhaust gas due to the collision with the collision plate, and allows the exhaust plate that has traveled straight through the exhaust pipe to pass through the collision plate. This converts the flow of exhaust gas into a swirling flow.

そして、この排気浄化装置によれば、添加弁は、排気管の管壁部と一体の装着部に装着される。また、添加弁は、排気管の軸方向に対して垂直に還元剤を噴射するように配され、衝突分散機構は、噴孔の開口部の直下に設けられている。
また、衝突板は、９０度の中心角を有する略同一径の扇形板状の４つのフィンであり、４つのフィンは、添加弁が還元剤を噴射する方向を鉛直下方とみなすと、直進してきた排ガスの流れに垂直な排気管の内部断面を４等分した左上、右上、右下、左下の各々の領域に配されている。そして、左上のフィンおよび右下のフィンは、各々の扇形の２辺の内で左右方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられ、右上のフィンおよび左下のフィンは、各々、上下方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられている。 And according to this exhaust gas purification device, the addition valve is mounted on the mounting portion integral with the tube wall portion of the exhaust pipe. The addition valve is arranged so as to inject the reducing agent perpendicular to the axial direction of the exhaust pipe, and the collision dispersion mechanism is provided immediately below the opening of the injection hole.
The impingement plate is four fan-shaped plate fins having a central angle of 90 degrees and substantially the same diameter, and the four fins go straight when the direction in which the addition valve injects the reducing agent is regarded as vertically downward. The exhaust pipe perpendicular to the flow of the exhaust gas is divided into four areas in the upper left, upper right, lower right, and lower left, respectively. The upper left fin and the lower right fin are provided so as to rotate and incline to the downstream side with one side parallel to the left-right direction as the rotation center among the two sides of each sector shape. The upper right fin and the lower left fin Are provided so as to be inclined to the downstream side with one side parallel to the vertical direction as the center of rotation.

〔実施例１の構成〕
実施例１の排気浄化装置１の構成を、図１および図２を用いて説明する。
排気浄化装置１は、エンジンの排ガスに還元剤を噴射供給して排ガスに含まれる窒素酸化物（ＮＯｘ）を還元して浄化するものである。還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。 [Configuration of Example 1]
The configuration of the exhaust emission control device 1 according to the first embodiment will be described with reference to FIGS. 1 and 2.
The exhaust emission control device 1 supplies and supplies a reducing agent to exhaust gas from an engine to reduce and purify nitrogen oxides (NO x ) contained in the exhaust gas. The reducing agent is, for example, urea water, and ammonia (NH 3 ) generated by decomposition of urea reacts with NO x by a catalyst to generate harmless nitrogen (N 2 ) and water (H 2 O). Thus, NO x is purified.

排気浄化装置１は、排ガスが通る排気管２と、排気管２の内部に還元剤を噴射する添加弁３と、所定のタンク４から還元剤を吸引して添加弁３の方に吐出する供給ポンプ５と、噴射された還元剤を衝突により排ガス中に分散させる衝突分散機構６と、添加弁３や供給ポンプ５等の作動を制御する電子制御装置（ＥＣＵ）７とを備える。
なお、ＥＣＵ７は、制御機能および演算機能を有するＣＰＵ、ＲＯＭおよびＲＡＭ等の記憶装置、入力装置ならびに出力装置等により構成される周知のマイクロコンピュータである。 The exhaust gas purification apparatus 1 includes an exhaust pipe 2 through which exhaust gas passes, an addition valve 3 that injects a reducing agent into the exhaust pipe 2, and a supply that sucks the reducing agent from a predetermined tank 4 and discharges it toward the addition valve 3. A pump 5, a collision dispersion mechanism 6 that disperses the injected reducing agent in the exhaust gas by collision, and an electronic control unit (ECU) 7 that controls the operation of the addition valve 3, the supply pump 5, and the like are provided.
The ECU 7 is a well-known microcomputer including a CPU having a control function and an arithmetic function, a storage device such as a ROM and a RAM, an input device, an output device, and the like.

排気管２は、触媒よりも上流側の排ガス流路の一部を形成する。また、排気管２は、軸方向の長さが１０ｃｍ程度となるように管壁部１０が設けられ、さらに、管壁部１０の両端に他の排ガス流路部材との接続部をなすフランジ１１が設けられている。そして、排気管２に添加弁３が装着されるとともに衝突分散機構６が設けられることで、排気管２、添加弁３および衝突分散機構６は１つのモジュールを構成する。   The exhaust pipe 2 forms a part of the exhaust gas flow channel upstream of the catalyst. Further, the exhaust pipe 2 is provided with a tube wall portion 10 so that the length in the axial direction is about 10 cm, and further, flanges 11 forming connection portions with other exhaust gas flow path members at both ends of the tube wall portion 10. Is provided. The addition pipe 3 is attached to the exhaust pipe 2 and the collision dispersion mechanism 6 is provided, so that the exhaust pipe 2, the addition valve 3 and the collision dispersion mechanism 6 constitute one module.

ここで、添加弁３が装着される装着部１２は、管壁部１０と一体に設けられて、排気管２の軸方向に垂直かつ図２の図示上方に突出する筒状をなす。そして、装着部１２の内部は、排気管２の内部に連通しており、添加弁３は、装着部１２の内部に先端部１３が挿入された状態で排気管２に装着される。   Here, the attachment portion 12 to which the addition valve 3 is attached is provided integrally with the tube wall portion 10 and has a cylindrical shape perpendicular to the axial direction of the exhaust pipe 2 and protruding upward in FIG. The inside of the mounting portion 12 communicates with the inside of the exhaust pipe 2, and the addition valve 3 is mounted on the exhaust pipe 2 with the tip portion 13 inserted in the mounting portion 12.

添加弁３は、供給ポンプ５から吐出された還元剤を内部に受け入れるとともに、受け入れた還元剤を先端部１３に導いて先端に開口する噴孔（図示せず）から噴射する。ここで、添加弁３は、排気管２の軸方向に対して垂直に還元剤を噴射するように装着部１２に装着されている。また、添加弁３の先端部１３は、上記のように装着部１２の内部に収容され、管壁部１０の内周面よりも外周側に存在するように配されて排気管２の内部に臨む。   The addition valve 3 receives the reducing agent discharged from the supply pump 5 inside, and guides the received reducing agent to the tip portion 13 and injects it from an injection hole (not shown) opened at the tip. Here, the addition valve 3 is mounted on the mounting portion 12 so as to inject the reducing agent perpendicular to the axial direction of the exhaust pipe 2. Further, the distal end portion 13 of the addition valve 3 is accommodated inside the mounting portion 12 as described above, and is arranged so as to be present on the outer peripheral side with respect to the inner peripheral surface of the tube wall portion 10. Come on.

なお、添加弁３は、例えば、ソレノイドコイル（図示せず）への通電により生じる磁気吸引力により弁体（図示せず）を駆動して噴孔を開放する電磁ソレノイド弁である。また、添加弁３の内部に供給された還元剤の内で噴射されなかった還元剤は、タンク４に戻される。   The addition valve 3 is, for example, an electromagnetic solenoid valve that opens a nozzle hole by driving a valve body (not shown) by a magnetic attractive force generated by energizing a solenoid coil (not shown). Further, the reducing agent that has not been injected among the reducing agents supplied into the addition valve 3 is returned to the tank 4.

衝突分散機構６は、噴孔の開口部の直下、すなわち排気管２の内部で還元剤の噴射方向と交差する位置に設けられ、例えば、９０度の中心角を有する略同一径の４つの扇形板状のフィン１６、１７、１８、１９を衝突板として有する。 The collision dispersion mechanism 6 is provided immediately below the opening of the nozzle hole, that is, at a position that intersects the injection direction of the reducing agent inside the exhaust pipe 2, and has, for example, four sectors of approximately the same diameter having a central angle of 90 degrees. Plate-like fins 16 , 17 , 18 , 19 are provided as collision plates .

４つのフィン１６、１７、１８、１９は、図２（ａ）に示す排気管２の円状の内部断面を４等分した左上、右上、右下、左下の各々の領域に配されている。そして、左上、右下のフィン１６、１８は、各々の扇形の２辺の内で左右方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられ、右上、左下のフィン１７、１９は、各々、上下方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられている。このため、排ガスの流れは、衝突分散機構６を通過することにより、排気管２の軸方向に直進する直線流から周方向に旋回する旋回流に変換される。   The four fins 16, 17, 18, and 19 are arranged in each of the upper left, upper right, lower right, and lower left regions obtained by dividing the circular inner cross section of the exhaust pipe 2 shown in FIG. . The upper left and lower right fins 16 and 18 are provided so as to rotate and tilt to the downstream side with one side parallel to the left-right direction as the rotation center among the two sides of each fan shape. , 19 are provided so as to rotate and incline downstream with one side parallel to the vertical direction as the center of rotation. For this reason, the flow of exhaust gas passes through the collision dispersion mechanism 6 and is converted from a linear flow straight in the axial direction of the exhaust pipe 2 to a swirl flow swirling in the circumferential direction.

ここで、装着部１２は、図２（ａ）の図示右側に偏在するように設けられており、還元剤の噴射方向は主に右下のフィン１８と交差する。このため、噴射された還元剤は、フィン１８に衝突し、添加弁３の直下に向かう方向から排気管２の軸方向を下流側に向かう方向に進行方向を変える。そして、下流側に向かう還元剤は、排ガスの旋回流に乗り排ガス中に分散しながら触媒に導かれる。   Here, the mounting portion 12 is provided so as to be unevenly distributed on the right side of FIG. 2A, and the reducing agent injection direction mainly intersects with the lower right fin 18. For this reason, the injected reducing agent collides with the fins 18 and changes the traveling direction from the direction directly below the addition valve 3 to the direction toward the downstream side of the axial direction of the exhaust pipe 2. Then, the reducing agent heading downstream is guided to the catalyst while being dispersed in the exhaust gas by swirling the exhaust gas.

〔実施例１の効果〕
実施例１の排気浄化装置１は、排ガスが通る排気管２と、排気管２の内部に還元剤を噴射する添加弁３とを備え、噴孔が開口する添加弁３の先端部１３は、管壁部１０の内周面よりも外周側に存在するように配されて排気管２の内部に臨む。
これにより、添加弁３の先端部１３は、排気管２の内部に突出しない状態で排気管２の内部に臨むことができる。このため、添加弁３は、排ガスの直撃を回避しつつ、排気管２の内部に還元剤を噴射することができる。 [Effect of Example 1]
The exhaust emission control device 1 according to the first embodiment includes an exhaust pipe 2 through which exhaust gas passes, and an addition valve 3 that injects a reducing agent into the exhaust pipe 2. It is arranged so as to be present on the outer peripheral side of the inner peripheral surface of the tube wall portion 10 and faces the inside of the exhaust pipe 2.
Thereby, the front-end | tip part 13 of the addition valve 3 can face the inside of the exhaust pipe 2 in the state which does not protrude inside the exhaust pipe 2. FIG. For this reason, the addition valve 3 can inject the reducing agent into the exhaust pipe 2 while avoiding the direct hit of the exhaust gas.

また、排気浄化装置１は、噴射された還元剤の衝突を受けるとともに衝突した還元剤を排ガス中に分散させる衝突分散機構６を備え、衝突分散機構６は、排気管２の内部で還元剤の噴射方向と交差する位置に配される。
これにより、還元剤噴霧の微粒化を促進することができるので、還元剤を排ガス中に効率的に分散させることができる。 The exhaust emission control device 1 also includes a collision dispersion mechanism 6 that receives a collision of the injected reducing agent and disperses the collided reducing agent in the exhaust gas, and the collision dispersion mechanism 6 includes the reducing agent inside the exhaust pipe 2. It is arranged at a position that intersects the injection direction.
Thereby, since atomization of a reducing agent spray can be accelerated | stimulated, a reducing agent can be efficiently disperse | distributed in waste gas.

また、排気管２に添加弁３が装着されるとともに衝突分散機構６が設けられることで、排気管２、添加弁３および衝突分散機構６は１つのモジュールを構成する。
これにより、添加弁３および衝突分散機構６の配置の自由度を高めることができる。 Further, the addition pipe 3 is attached to the exhaust pipe 2 and the collision dispersion mechanism 6 is provided, so that the exhaust pipe 2, the addition valve 3 and the collision dispersion mechanism 6 constitute one module.
Thereby, the freedom degree of arrangement | positioning of the addition valve 3 and the collision dispersion | distribution mechanism 6 can be raised.

また、添加弁３は、排気管２の軸方向に対して垂直に還元剤を噴射するように配され、衝突分散機構６は、噴孔の開口部の直下に設けられている。
これにより、噴射された還元剤を確実に衝突分散機構６に衝突させて分散効率を高めることができる。
さらに、衝突分散機構６は、排ガスの流れを旋回流に変換するため、還元剤の排ガス中への分散がより効率的になる。 The addition valve 3 is arranged so as to inject the reducing agent perpendicular to the axial direction of the exhaust pipe 2, and the collision dispersion mechanism 6 is provided immediately below the opening of the injection hole.
As a result, the injected reducing agent can be reliably caused to collide with the collision dispersion mechanism 6 to increase the dispersion efficiency.
Furthermore, since the collision dispersion mechanism 6 converts the flow of the exhaust gas into a swirling flow, the reducing agent is more efficiently dispersed in the exhaust gas.

〔変形例〕
実施例１の排気浄化装置１によれば、添加弁３は、排気管２の軸方向に対して垂直に還元剤を噴射するものであったが、軸方向に対して垂直以外の傾斜角を有する方向から噴射できるように添加弁３を配してもよい。 [Modification]
According to the exhaust gas purification apparatus 1 of the first embodiment, the addition valve 3 injects the reducing agent perpendicular to the axial direction of the exhaust pipe 2, but has an inclination angle other than perpendicular to the axial direction. You may arrange | position the addition valve 3 so that it can inject from the direction which has.

排気浄化装置の構成図である。It is a block diagram of an exhaust emission control device. （ａ）はモジュールを下流側から視た正面図であり、（ｂ）は（ａ）の右側からモジュールの内部を視た側面図である。(A) is a front view of the module from the lower stream side, a side view of the interior of the module from the right side of (b) is (a).

符号の説明Explanation of symbols

１ 排気浄化装置
２ 排気管
３ 添加弁
６ 衝突分散機構
１０ 管壁部
１２ 装着部
１３ 先端部 DESCRIPTION OF SYMBOLS 1 Exhaust purification device 2 Exhaust pipe 3 Addition valve 6 Collision dispersion mechanism 10 Tube wall part 12 Mounting part 13 Tip part

Claims (3)

排ガスが通る排気管と、この排気管の内部に還元剤を噴射する添加弁と、
前記排気管の内部で還元剤の噴射方向と交差する位置に配され、噴射された還元剤の衝突を受けるとともに衝突した還元剤を排ガス中に分散させる衝突分散機構とを備え、
噴孔の開口部を有する前記添加弁の先端部が、前記排気管の内周面よりも外周側に配された状態で前記排気管の内部に臨み、
前記衝突分散機構は、噴射された還元剤の衝突を受ける衝突板であり、前記衝突板との衝突により還元剤を排ガス中に分散させるとともに、前記排気管を直進してきた排ガスに前記衝突板を通過させることで排ガスの流れを旋回流に変換することを特徴とする排気浄化装置。 An exhaust pipe through which exhaust gas passes, an addition valve for injecting a reducing agent into the exhaust pipe,
A collision dispersion mechanism that is disposed at a position intersecting the injection direction of the reducing agent inside the exhaust pipe, receives a collision of the injected reducing agent, and disperses the colliding reducing agent in the exhaust gas;
The tip of the addition valve having the opening of the nozzle hole faces the inside of the exhaust pipe in a state of being arranged on the outer peripheral side of the inner peripheral surface of the exhaust pipe,
The collision dispersion mechanism is a collision plate that receives a collision of the injected reducing agent, disperses the reducing agent in the exhaust gas due to the collision with the collision plate, and also applies the collision plate to the exhaust gas that has traveled straight through the exhaust pipe. An exhaust emission control device that converts a flow of exhaust gas into a swirl flow by passing the exhaust gas. 請求項１に記載の排気浄化装置において、
前記添加弁は、前記排気管の管壁部と一体の装着部に装着されることを特徴とする排気浄化装置。 The exhaust emission control device according to claim 1,
The exhaust purification apparatus according to claim 1, wherein the addition valve is attached to a mounting portion integral with a pipe wall portion of the exhaust pipe. 請求項２に記載の排気浄化装置において、
前記添加弁は、前記排気管の軸方向に対して垂直に還元剤を噴射するように配され、
前記衝突分散機構は、前記噴孔の開口部の直下に設けられ、
前記衝突板は、９０度の中心角を有する略同一径の扇形板状の４つのフィンであり、
前記４つのフィンは、前記添加弁が還元剤を噴射する方向を鉛直下方とみなすと、直進してきた排ガスの流れに垂直な前記排気管の内部断面を４等分した左上、右上、右下、左下の各々の領域に配され、
左上のフィンおよび右下のフィンは、各々の扇形の２辺の内で左右方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられ、
右上のフィンおよび左下のフィンは、各々、上下方向に平行な１辺を回転中心として下流側に回転傾斜するように設けられていることを特徴とする排気浄化装置。 The exhaust emission control device according to claim 2,
The addition valve is arranged to inject a reducing agent perpendicular to the axial direction of the exhaust pipe,
The collision dispersion mechanism is provided immediately below the opening of the nozzle hole ,
The collision plate is four fan-shaped fins having substantially the same diameter and a central angle of 90 degrees,
The four fins, when the direction in which the addition valve injects the reducing agent is regarded as a vertically downward direction, upper left, upper right, lower right, and the internal cross section of the exhaust pipe perpendicular to the flow of exhaust gas that has traveled straight. Arranged in each lower left area,
The upper left fin and the lower right fin are provided so as to be inclined to the downstream side with one side parallel to the left-right direction as the rotation center among the two sides of each fan shape,
The exhaust gas purification apparatus, wherein the upper right fin and the lower left fin are provided so as to rotate and incline downstream with one side parallel to the vertical direction as a rotation center .
JP2007112153A 2007-04-20 2007-04-20 Exhaust purification device Expired - Fee Related JP4397402B2 (en)

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