WO2021193735A1 - Mixer - Google Patents

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Publication number
WO2021193735A1
WO2021193735A1 PCT/JP2021/012289 JP2021012289W WO2021193735A1 WO 2021193735 A1 WO2021193735 A1 WO 2021193735A1 JP 2021012289 W JP2021012289 W JP 2021012289W WO 2021193735 A1 WO2021193735 A1 WO 2021193735A1
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WO
WIPO (PCT)
Prior art keywords
mixer
reducing agent
blades
exhaust gas
fin members
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PCT/JP2021/012289
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French (fr)
Japanese (ja)
Inventor
達也 上川
建都 金田
悠治 葛西
Original Assignee
いすゞ自動車株式会社
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Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Priority to CN202180023457.2A priority Critical patent/CN115315572B/en
Publication of WO2021193735A1 publication Critical patent/WO2021193735A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • 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
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Definitions

  • the present disclosure relates to a mixer that agitates exhaust gas and a reducing agent.
  • a urea SCR (Selective Catalytic Reduction) system is known as a system for purifying exhaust gas discharged from an internal combustion engine. Further, in this system, it is known that a mixer is provided between an injector for injecting urea water and an SCR catalyst in order to promote mixing and diffusion of exhaust gas and urea water (see, for example, Patent Document 1). ..
  • the conventional mixer has room for improvement in terms of stirring performance.
  • An object of one aspect of the present disclosure is to provide a mixer capable of further improving the stirring performance.
  • the mixer according to one aspect of the present disclosure is provided between the reducing agent supply device that supplies the reducing agent into the exhaust pipe and the NOx purification catalyst in the exhaust pipe through which the exhaust gas discharged from the internal combustion engine flows, and swirls the exhaust gas.
  • the blades are arranged so as to be densely packed.
  • the stirring performance can be further improved.
  • FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure according to the embodiment of the present disclosure.
  • FIG. 2 is a perspective view of the mixer according to the embodiment of the present disclosure.
  • FIG. 3 is a front view of the mixer according to the embodiment of the present disclosure.
  • FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure of the present embodiment.
  • the exhaust structure shown in FIG. 1 is mounted on, for example, a vehicle equipped with an internal combustion engine (for example, a commercial vehicle such as a bus or a truck).
  • the internal combustion engine may be a diesel engine or a gasoline engine.
  • the exhaust pipe 1 is a cylindrical pipe through which the exhaust gas discharged from the internal combustion engine flows. Although not shown, the upstream end of the exhaust pipe 1 is connected to an exhaust manifold provided in the internal combustion engine.
  • the arrow a shown in FIG. 1 indicates the flow direction of the exhaust gas in the exhaust pipe 1 (which may be referred to as the axial direction of the exhaust pipe 1).
  • the exhaust pipe 1 is provided with a urea water injection device 2, a mixer 3, and an SCR (Selective Catalytic Reduction) catalyst 4 in this order from the upstream side.
  • a urea water injection device 2 a mixer 3
  • an SCR (Selective Catalytic Reduction) catalyst 4 in this order from the upstream side.
  • the size, shape, positional relationship, and the like of each component shown in FIG. 1 are merely examples, and are not limited to those shown in FIG.
  • the urea water injection device 2 (an example of a reducing agent supply device) is a device that injects urea water (an example of a reducing agent) into the exhaust pipe 1.
  • the urea water injection device 2 is also called, for example, a dosing module or an injector.
  • the urea water injection device 2 has a plurality of injection ports independent of each other. Urea water is injected from these injection ports.
  • the urea water injected by the urea water injection device 2 is hydrolyzed on the downstream side of the mixer 3, for example.
  • Ammonia generated thereby (an example of a substance generated from the reducing agent) is supplied to the SCR catalyst 4.
  • the injection amount and injection timing of urea water are controlled by a control device (not shown).
  • the mixer 3 is a device that stirs and mixes urea water and exhaust gas.
  • the exhaust gas that has passed through the mixer 3 becomes a swirling flow that entrains urea water.
  • the urea water contained in this swirling flow vaporizes before reaching the SCR catalyst 4 to become ammonia.
  • SCR catalyst 4 (an example of NOx purification catalyst) is a catalyst that reduces NOx in exhaust gas to nitrogen by ammonia generated from urea water.
  • the SCR catalyst 4 may be housed in a catalyst converter (also referred to as a catalyst casing) which is a housing that can be attached to and detached from the exhaust pipe 1.
  • a catalyst converter also referred to as a catalyst casing
  • an ASC Ammonia Slip Catalyst
  • ASC is a catalyst that oxidizes and decomposes ammonia that cannot be completely consumed by the SCR catalyst 4. This makes it possible to prevent ammonia from being discharged into the atmosphere.
  • FIG. 2 is a perspective view of the mixer 3.
  • FIG. 3 is a front view of the mixer 3. Both FIGS. 2 and 3 show a state in which the mixer 3 is viewed from the upstream side in the flow direction of the exhaust gas.
  • the mixer 3 has fin members 3a, 3b, and 3c in this order from the upstream side in the flow direction of the exhaust gas.
  • the fin members 3a, 3b, and 3c are separate from each other and are arranged at predetermined intervals in the flow direction of the exhaust gas.
  • the fin members 3a to 3c have the same shape and the same size.
  • Each of the fin members 3a to 3c has three blade portions (reference numerals omitted) extending radially from the central portion.
  • the three blades are integrally formed. Further, the three blades are fixed (for example, welded) to the inner peripheral surface of the exhaust pipe 1.
  • the number of blades provided for each fin member is the same as the number of injection ports of the urea water injection device 2. Further, the total number of blades provided on all fin members is larger than the number of injection ports of the urea water injection device 2. In the present embodiment, assuming that the number of injection ports of the urea water injection device 2 is three, three blades are provided on one fin member, and the total number of blades provided on the three fin members is nine. The case of one is given as an example.
  • the fin members 3a to 3c are provided so as to be offset in the circumferential direction of the exhaust pipe 1 so that a region A in which the blades are dense (hereinafter referred to as a blade dense region A) is formed.
  • a blade dense region A a region A in which the blades are dense
  • the distance between the blades in the blade dense region A is such that the blade at the end of one blade dense region A and another blade adjacent to the blade. It is closer than the distance from the blade portion at the end of the densely packed region A.
  • the number of blade dense regions A is the same as the number of injection ports of the urea water injection device 2.
  • FIG. 3 shows a case where the number of injection ports of the urea water injection device 2 is three and three blade dense regions A are formed as an example.
  • the blade dense region A is formed corresponding to the position of the injection port of the urea water injection device 2 (more specifically, the region where the urea water injected from the injection port can directly hit).
  • the mixer 3 has a plurality of fin members 3a to 3c provided with the same number of blades as the number of injection ports of the urea water injection device 2, and the plurality of fin members 3a to 3c. Is characterized in that the blade portions of each of the plurality of fin members 3a to 3c are arranged so as to be densely arranged in the region A where the reducing agent injected from the injection port can directly hit.
  • the stirring performance of the exhaust gas and the urea water can be further improved.
  • the stirring performance is low, a white product due to urea water may be deposited in the exhaust pipe 1, but in the present embodiment, this can be prevented.
  • the mixer 3 is characterized by being composed of fin members 3a to 3c having the same shape and the same size.
  • the degree of density of the blades in the blade density area A can be easily adjusted. Further, the number of fin members can be easily increased or decreased according to the number of injection ports. Further, the manufacturing cost can be reduced as compared with the case where a plurality of fin members are integrally formed.
  • the SCR catalyst 4 has been described as an example of the NOx purification catalyst, but the present invention is not limited to this. Instead of the SCR catalyst 4, another selective reduction catalyst, a NOx adsorption catalyst, or a three-way catalyst may be used. In that case, a reducing agent other than urea water (for example, a hydrocarbon or the like) may be used.
  • the mixer of the present disclosure is useful for a mixer that mixes a gas (for example, exhaust gas) and a liquid (for example, a reducing agent).
  • a gas for example, exhaust gas
  • a liquid for example, a reducing agent

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

Abstract

A mixer that further improves mixing performance. This mixer is provided inside an exhaust pipe through which exhaust gas emitted from an internal combustion engine is discharged, between a reducing agent supply device, which supplies a reducing agent inside the exhaust pipe, and a NOx purification catalyst. The mixer generates a swirling flow that mixes the exhaust gas and the reducing agent. The mixer is provided with a great number of blades than the number of injection ports of the reducing agent supply device, and is positioned so that the blades are concentrated in a region corresponding to the position of the injection ports.

Description

ミキサーmixer
　本開示は、排ガスと還元剤とを攪拌するミキサーに関する。 The present disclosure relates to a mixer that agitates exhaust gas and a reducing agent.
　従来、内燃機関から排出された排ガスを浄化するシステムとして、尿素ＳＣＲ（Selective Catalytic Reduction）システムが知られている。また、このシステムでは、排ガスと尿素水との混合拡散を促進させるために、尿素水を噴射するインジェクタとＳＣＲ触媒との間にミキサーを設けることが知られている（例えば、特許文献１参照）。 Conventionally, a urea SCR (Selective Catalytic Reduction) system is known as a system for purifying exhaust gas discharged from an internal combustion engine. Further, in this system, it is known that a mixer is provided between an injector for injecting urea water and an SCR catalyst in order to promote mixing and diffusion of exhaust gas and urea water (see, for example, Patent Document 1). ..
日本国特開２０１４－１５８４８号公報Japanese Patent Application Laid-Open No. 2014-15848
　しかしながら、従来のミキサーは、攪拌性能の点で改善の余地があった。 However, the conventional mixer has room for improvement in terms of stirring performance.
　本開示の一態様の目的は、より攪拌性能を向上させることができるミキサーを提供することである。 An object of one aspect of the present disclosure is to provide a mixer capable of further improving the stirring performance.
　本開示の一態様に係るミキサーは、内燃機関から排出された排ガスが流れる排気管内において前記排気管内に還元剤を供給する還元剤供給装置とＮＯｘ浄化触媒との間に設けられ、前記排ガスの旋回流を発生させて前記排ガスと前記還元剤とを攪拌するミキサーであって、前記還元剤供給装置の噴射口の数よりも多くの羽根部を備え、前記噴射口の位置に対応する領域に前記羽根部が密集するように配置される。 The mixer according to one aspect of the present disclosure is provided between the reducing agent supply device that supplies the reducing agent into the exhaust pipe and the NOx purification catalyst in the exhaust pipe through which the exhaust gas discharged from the internal combustion engine flows, and swirls the exhaust gas. A mixer that generates a flow to stir the exhaust gas and the reducing agent, and has more blades than the number of injection ports of the reducing agent supply device, and the region corresponding to the position of the injection port is the said. The blades are arranged so as to be densely packed.
　本開示によれば、より攪拌性能を向上させることができる。 According to the present disclosure, the stirring performance can be further improved.
図１は、本開示の実施の形態に係る排気構造の構成の一例を示す模式図である。FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure according to the embodiment of the present disclosure. 図２は、本開示の実施の形態に係るミキサーの斜視図である。FIG. 2 is a perspective view of the mixer according to the embodiment of the present disclosure. 図３は、本開示の実施の形態に係るミキサーの正面図である。FIG. 3 is a front view of the mixer according to the embodiment of the present disclosure.
　以下、本開示の実施の形態について、図面を参照しながら説明する。なお、各図において共通する構成要素については同一の符号を付し、それらの説明は適宜省略する。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The components common to each figure are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
　まず、図１を用いて、本実施の形態の排気構造の構成について説明する。図１は、本実施の形態の排気構造の構成の一例を示す模式図である。 First, the configuration of the exhaust structure of the present embodiment will be described with reference to FIG. FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure of the present embodiment.
　図１に示す排気構造は、例えば、内燃機関を搭載した車両（例えば、バス、トラック等の商用車）に搭載される。内燃機関は、ディーゼルエンジンでもよいし、ガソリンエンジンでもよい。 The exhaust structure shown in FIG. 1 is mounted on, for example, a vehicle equipped with an internal combustion engine (for example, a commercial vehicle such as a bus or a truck). The internal combustion engine may be a diesel engine or a gasoline engine.
　排気管１は、内燃機関から排出された排ガスが流れる筒状の配管である。図示は省略するが、排気管１の上流端は、内燃機関に設けられた排気マニホールドに接続されている。図１に示す矢印ａは、排気管１内における排ガスの流れ方向（排気管１の軸方向と言ってもよい）を示している。 The exhaust pipe 1 is a cylindrical pipe through which the exhaust gas discharged from the internal combustion engine flows. Although not shown, the upstream end of the exhaust pipe 1 is connected to an exhaust manifold provided in the internal combustion engine. The arrow a shown in FIG. 1 indicates the flow direction of the exhaust gas in the exhaust pipe 1 (which may be referred to as the axial direction of the exhaust pipe 1).
　排気管１には、上流側から順に、尿素水噴射装置２、ミキサー３、ＳＣＲ（Selective Catalytic Reduction）触媒４が設けられている。なお、図１に示す各構成要素の大きさ、形状、位置関係等は、あくまで一例であり、図１の図示に限定されない。 The exhaust pipe 1 is provided with a urea water injection device 2, a mixer 3, and an SCR (Selective Catalytic Reduction) catalyst 4 in this order from the upstream side. The size, shape, positional relationship, and the like of each component shown in FIG. 1 are merely examples, and are not limited to those shown in FIG.
　尿素水噴射装置２（還元剤供給装置の一例）は、排気管１内に尿素水（還元剤の一例）を噴射する装置である。尿素水噴射装置２は、例えば、ドージングモジュールまたはインジェクタなどとも呼ばれる。 The urea water injection device 2 (an example of a reducing agent supply device) is a device that injects urea water (an example of a reducing agent) into the exhaust pipe 1. The urea water injection device 2 is also called, for example, a dosing module or an injector.
　尿素水噴射装置２は、互いに独立した複数の噴射口を有する。それら噴射口から尿素水は噴射される。 The urea water injection device 2 has a plurality of injection ports independent of each other. Urea water is injected from these injection ports.
　尿素水噴射装置２により噴射された尿素水は、例えば、ミキサー３より下流側において加水分解される。これにより発生したアンモニア（還元剤から発生する物質の一例）は、ＳＣＲ触媒４へ供給される。なお、尿素水の噴射量や噴射タイミングは、図示しない制御装置によって制御される。 The urea water injected by the urea water injection device 2 is hydrolyzed on the downstream side of the mixer 3, for example. Ammonia generated thereby (an example of a substance generated from the reducing agent) is supplied to the SCR catalyst 4. The injection amount and injection timing of urea water are controlled by a control device (not shown).
　ミキサー３は、尿素水と排ガスとを攪拌混合させる装置である。ミキサー３を通過した排ガスは、尿素水を巻き込んだ旋回流となる。この旋回流に含まれる尿素水は、ＳＣＲ触媒４に到達する前に気化してアンモニアとなる。 The mixer 3 is a device that stirs and mixes urea water and exhaust gas. The exhaust gas that has passed through the mixer 3 becomes a swirling flow that entrains urea water. The urea water contained in this swirling flow vaporizes before reaching the SCR catalyst 4 to become ammonia.
　ミキサー３の詳細については、図２、図３を用いて後述する。 The details of the mixer 3 will be described later with reference to FIGS. 2 and 3.
　ＳＣＲ触媒４（ＮＯｘ浄化触媒の一例）は、尿素水から発生したアンモニアにより、排ガス中のＮＯｘを窒素に還元する触媒である。 SCR catalyst 4 (an example of NOx purification catalyst) is a catalyst that reduces NOx in exhaust gas to nitrogen by ammonia generated from urea water.
　なお、ＳＣＲ触媒４は、排気管１に対して着脱可能な筐体である触媒コンバータ（触媒ケーシングとも呼ばれる）に収容されてもよい。 The SCR catalyst 4 may be housed in a catalyst converter (also referred to as a catalyst casing) which is a housing that can be attached to and detached from the exhaust pipe 1.
　また、図示は省略するが、ＳＣＲ触媒４の下流側に、ＡＳＣ（Ammonia Slip Catalyst）が設けられてもよい。ＡＳＣは、ＳＣＲ触媒４で消費しきれなかったアンモニアを酸化、分解する触媒である。これにより、アンモニアが大気中に排出されることを防止できる。 Although not shown, an ASC (Ammonia Slip Catalyst) may be provided on the downstream side of the SCR catalyst 4. ASC is a catalyst that oxidizes and decomposes ammonia that cannot be completely consumed by the SCR catalyst 4. This makes it possible to prevent ammonia from being discharged into the atmosphere.
　以上、本実施の形態の排気構造の構成について説明した。 The configuration of the exhaust structure of this embodiment has been described above.
　次に、図２を用いて、図１に示したミキサー３の構成について説明する。図２は、ミキサー３の斜視図である。図３は、ミキサー３の正面図である。図２、図３はともに、ミキサー３を排ガスの流れ方向の上流側から見た状態を示している。 Next, the configuration of the mixer 3 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a perspective view of the mixer 3. FIG. 3 is a front view of the mixer 3. Both FIGS. 2 and 3 show a state in which the mixer 3 is viewed from the upstream side in the flow direction of the exhaust gas.
　図２、図３に示すように、ミキサー３は、排ガスの流れ方向の上流側から順に、フィン部材３ａ、３ｂ、３ｃを有する。フィン部材３ａ、３ｂ、３ｃは、互いに別体であり、排ガスの流れ方向において所定の間隔を空けて配置されている。フィン部材３ａ～３ｃは、同じ形状かつ同じサイズである。 As shown in FIGS. 2 and 3, the mixer 3 has fin members 3a, 3b, and 3c in this order from the upstream side in the flow direction of the exhaust gas. The fin members 3a, 3b, and 3c are separate from each other and are arranged at predetermined intervals in the flow direction of the exhaust gas. The fin members 3a to 3c have the same shape and the same size.
　フィン部材３ａ～３ｃは、それぞれ、中心部分から放射状に分岐して伸びる３枚の羽根部（符号略）を有する。１つのフィン部材において、３枚の羽根部は、一体的に形成されている。また、３枚の羽根部は、排気管１の内周面に固定（例えば、溶接）されている。 Each of the fin members 3a to 3c has three blade portions (reference numerals omitted) extending radially from the central portion. In one fin member, the three blades are integrally formed. Further, the three blades are fixed (for example, welded) to the inner peripheral surface of the exhaust pipe 1.
　フィン部材１つあたりに設けられる羽根部の数は、尿素水噴射装置２の噴射口の数と同じである。また、全てのフィン部材に設けられる羽根部の総数は、尿素水噴射装置２の噴射口の数よりも多い。本実施の形態では、仮に尿素水噴射装置２の噴射口の数が３つであるとして、１つのフィン部材に羽根部が３つ設けられ、３つのフィン部材に設けられる羽根部の総数が９つである場合を例に挙げている。 The number of blades provided for each fin member is the same as the number of injection ports of the urea water injection device 2. Further, the total number of blades provided on all fin members is larger than the number of injection ports of the urea water injection device 2. In the present embodiment, assuming that the number of injection ports of the urea water injection device 2 is three, three blades are provided on one fin member, and the total number of blades provided on the three fin members is nine. The case of one is given as an example.
　フィン部材３ａ～３ｃは、図３に示すように、羽根部が密集した領域Ａ（以下、羽根部密集領域Ａという）が形成されるように、排気管１の周方向にずれて設けられている。換言すれば、図３に示す正面視において、羽根部密集領域Ａ内の羽根部同士の間隔は、ある羽根部密集領域Ａの端部にある羽根部と、その羽根部と隣り合う別の羽根部密集領域Ａの端部にある羽根部との間隔よりも密になっている。 As shown in FIG. 3, the fin members 3a to 3c are provided so as to be offset in the circumferential direction of the exhaust pipe 1 so that a region A in which the blades are dense (hereinafter referred to as a blade dense region A) is formed. There is. In other words, in the front view shown in FIG. 3, the distance between the blades in the blade dense region A is such that the blade at the end of one blade dense region A and another blade adjacent to the blade. It is closer than the distance from the blade portion at the end of the densely packed region A.
　羽根部密集領域Ａは、尿素水噴射装置２の噴射口の数と同じ数だけ形成される。図３では例として、尿素水噴射装置２の噴射口の数が３つであり、羽根部密集領域Ａが３つ形成される場合を示している。 The number of blade dense regions A is the same as the number of injection ports of the urea water injection device 2. FIG. 3 shows a case where the number of injection ports of the urea water injection device 2 is three and three blade dense regions A are formed as an example.
　また、羽根部密集領域Ａは、尿素水噴射装置２の噴射口の位置（より具体的には、噴射口から噴射された尿素水が直撃しうる領域）に対応して形成される。 Further, the blade dense region A is formed corresponding to the position of the injection port of the urea water injection device 2 (more specifically, the region where the urea water injected from the injection port can directly hit).
　このように、本実施の形態において、ミキサー３は、尿素水噴射装置２の噴射口の数と同数の羽根部を備えた複数のフィン部材３ａ～３ｃを有し、複数のフィン部材３ａ～３ｃは、噴射口から噴射された還元剤が直撃しうる領域Ａに、複数のフィン部材３ａ～３ｃそれぞれの羽根部が密集するように配置されることを特徴とする。 As described above, in the present embodiment, the mixer 3 has a plurality of fin members 3a to 3c provided with the same number of blades as the number of injection ports of the urea water injection device 2, and the plurality of fin members 3a to 3c. Is characterized in that the blade portions of each of the plurality of fin members 3a to 3c are arranged so as to be densely arranged in the region A where the reducing agent injected from the injection port can directly hit.
　よって、尿素水は、羽根部密集領域Ａに向けて噴射されるので、排ガスの旋回流に巻き込まれ易くなる。したがって、排ガスと尿素水との攪拌性能をより向上させることができる。攪拌性能が低い場合、尿素水に起因する白色生成物が排気管１内に堆積するおそれがあるが、本実施の形態では、それを防止することができる。 Therefore, since the urea water is injected toward the blade dense region A, it is easy to be involved in the swirling flow of the exhaust gas. Therefore, the stirring performance of the exhaust gas and the urea water can be further improved. When the stirring performance is low, a white product due to urea water may be deposited in the exhaust pipe 1, but in the present embodiment, this can be prevented.
　また、本実施の形態において、ミキサー３は、同形状かつ同サイズであるフィン部材３ａ～３ｃにより構成されることを特徴とする。 Further, in the present embodiment, the mixer 3 is characterized by being composed of fin members 3a to 3c having the same shape and the same size.
　よって、羽根部密集領域Ａにおける羽根部の密集の度合いを容易に調整できる。また、噴射口の数に応じたフィン部材の増減を容易に行うことができる。また、複数のフィン部材を一体的に形成する場合に比べて、製作コストを削減することができる。 Therefore, the degree of density of the blades in the blade density area A can be easily adjusted. Further, the number of fin members can be easily increased or decreased according to the number of injection ports. Further, the manufacturing cost can be reduced as compared with the case where a plurality of fin members are integrally formed.
　なお、本開示は、上記実施の形態の説明に限定されず、その趣旨を逸脱しない範囲において種々の変形が可能である。以下、変形例について説明する。 Note that the present disclosure is not limited to the description of the above-described embodiment, and various modifications can be made without departing from the spirit of the present embodiment. Hereinafter, a modified example will be described.
　［変形例１］
　実施の形態では、１つのフィン部材に設けられる羽根部が３つである場合を例に挙げて説明したが、これに限定されない。１つのフィン部材に設けられる羽根部の数は、例えば、尿素水噴射装置２の噴射口の数と同数であればよい。 [Modification 1]
In the embodiment, the case where one fin member has three blades is described as an example, but the present invention is not limited to this. The number of blades provided on one fin member may be, for example, the same as the number of injection ports of the urea water injection device 2.
　［変形例２］
　実施の形態では、ミキサー３を構成する複数のフィン部材が同じ形状かつ同じサイズである場合を例に挙げて説明したが、これに限定されない。例えば、ミキサー３を構成する複数のフィン部材は、互いに異なる形状やサイズであってもよい。 [Modification 2]
In the embodiment, the case where the plurality of fin members constituting the mixer 3 have the same shape and the same size has been described as an example, but the present invention is not limited to this. For example, the plurality of fin members constituting the mixer 3 may have different shapes and sizes from each other.
　［変形例３］
　実施の形態では、ＮＯｘ浄化触媒の一例としてＳＣＲ触媒４を例に挙げて説明したが、これに限定されない。ＳＣＲ触媒４の代わりに、他の選択還元型触媒、ＮＯｘ吸着触媒、または三元触媒が用いられてもよい。その場合、尿素水以外の還元剤（例えば、炭化水素等）が用いられてもよい。 [Modification 3]
In the embodiment, the SCR catalyst 4 has been described as an example of the NOx purification catalyst, but the present invention is not limited to this. Instead of the SCR catalyst 4, another selective reduction catalyst, a NOx adsorption catalyst, or a three-way catalyst may be used. In that case, a reducing agent other than urea water (for example, a hydrocarbon or the like) may be used.
　以上、変形例について説明した。上記変形例は、適宜組み合わせてもよい。 The modified example has been explained above. The above modified examples may be combined as appropriate.
　本出願は、２０２０年３月２７日付で出願された日本国特許出願（特願２０２０－０５７４１１）に基づくものであり、その内容はここに参照として取り込まれる。 This application is based on a Japanese patent application (Japanese Patent Application No. 2020-057411) filed on March 27, 2020, the contents of which are incorporated herein by reference.
　本開示のミキサーは、気体（例えば、排ガス）と液体（例えば、還元剤）とを混合させるミキサーに有用である。 The mixer of the present disclosure is useful for a mixer that mixes a gas (for example, exhaust gas) and a liquid (for example, a reducing agent).
　１　排気管
　２　尿素水噴射装置
　３　ミキサー
　３ａ、３ｂ、３ｃ　フィン部材
　４　ＳＣＲ 1 Exhaust pipe 2 Urea water injection device 3 Mixer 3a, 3b, 3c Fin member 4 SCR

Claims (5)

  1. 　内燃機関から排出された排ガスが流れる排気管内において前記排気管内に還元剤を供給する還元剤供給装置とＮＯｘ浄化触媒との間に設けられ、前記排ガスの旋回流を発生させて前記排ガスと前記還元剤とを攪拌するミキサーであって、
    　前記還元剤供給装置の噴射口の数よりも多くの羽根部を備え、
    　前記噴射口の位置に対応する領域に前記羽根部が密集するように配置される、
    　ミキサー。     In the exhaust pipe through which the exhaust gas discharged from the internal combustion engine flows, it is provided between the reducing agent supply device that supplies the reducing agent into the exhaust pipe and the NOx purification catalyst, and generates a swirling flow of the exhaust gas to generate the exhaust gas and the reduction. A mixer that stirs the agent
    The number of blades is larger than the number of injection ports of the reducing agent supply device.
    The blades are arranged so as to be densely packed in a region corresponding to the position of the injection port.
    mixer.
  2. 　前記還元剤供給装置の噴射口の数と同数の前記羽根部を備えたフィン部材を複数有し、
    　前記複数のフィン部材は、
    　前記噴射口の位置に対応する領域に、前記複数のフィン部材それぞれの前記羽根部が密集するように配置される、
    　請求項１に記載のミキサー。     It has a plurality of fin members having the same number of blades as the number of injection ports of the reducing agent supply device, and has a plurality of fin members.
    The plurality of fin members
    The blades of each of the plurality of fin members are arranged so as to be densely packed in the region corresponding to the position of the injection port.
    The mixer according to claim 1.
  3. 　前記複数のフィン部材は、
    　前記排ガスの流れ方向において、所定の間隔を空けて設けられている、
    　請求項２に記載のミキサー。     The plurality of fin members
    It is provided at a predetermined interval in the flow direction of the exhaust gas.
    The mixer according to claim 2.
  4. 　前記複数のフィン部材は、
    　同一形状および同一サイズである、
    　請求項２に記載のミキサー。     The plurality of fin members
    Same shape and size,
    The mixer according to claim 2.
  5. 　前記複数のフィン部材は、
    　互いに前記排気管の周方向にずれて設けられている、
    　請求項４に記載のミキサー。     The plurality of fin members
    The exhaust pipes are provided so as to be offset from each other in the circumferential direction.
    The mixer according to claim 4.
PCT/JP2021/012289 2020-03-27 2021-03-24 Mixer WO2021193735A1 (en)

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Citations (4)

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DE102015217357A1 (en) * 2015-09-10 2017-03-16 Volkswagen Aktiengesellschaft Mixing device and mixer system for an exhaust system of an internal combustion engine
JP2017214884A (en) * 2016-06-01 2017-12-07 いすゞ自動車株式会社 Exhaust emission control system
JP2019143532A (en) * 2018-02-20 2019-08-29 いすゞ自動車株式会社 Reductant injection device

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CN101900018A (en) * 2010-07-06 2010-12-01 清华大学 Urea mixing device
AU2017292601A1 (en) * 2016-07-07 2019-02-07 Caterpillar Inc. Dual mixer for exhaust gas aftertreatment systems
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JP2015031156A (en) * 2013-07-31 2015-02-16 カルソニックカンセイ株式会社 Exhaust emission control device
DE102015217357A1 (en) * 2015-09-10 2017-03-16 Volkswagen Aktiengesellschaft Mixing device and mixer system for an exhaust system of an internal combustion engine
JP2017214884A (en) * 2016-06-01 2017-12-07 いすゞ自動車株式会社 Exhaust emission control system
JP2019143532A (en) * 2018-02-20 2019-08-29 いすゞ自動車株式会社 Reductant injection device

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