JP2008248746A - Muffler with exhaust emission control function - Google Patents

Muffler with exhaust emission control function Download PDF

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JP2008248746A
JP2008248746A JP2007089441A JP2007089441A JP2008248746A JP 2008248746 A JP2008248746 A JP 2008248746A JP 2007089441 A JP2007089441 A JP 2007089441A JP 2007089441 A JP2007089441 A JP 2007089441A JP 2008248746 A JP2008248746 A JP 2008248746A
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cylinder
casing
exhaust gas
supply pipe
reducing agent
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Isato Aizawa
勇人 相沢
Daisuke Shirai
大輔 白井
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Tokyo Roki Co Ltd
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Tokyo Roki Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler with an exhaust emission control function capable of preventing drop of conversion efficiency of a reduction catalyst by sufficiently mixing exhaust gas and liquid reducer without providing a mixer structure body. <P>SOLUTION: The muffler 100 with the exhaust emission control function includes a turn part 51 in an exhaust gas channel inside thereof, and is divided into an upstream side exhaust gas channel 50a and a downstream side exhaust gas channel 50b. The muffler 100 is provided with a roughly box shape casing 1 of which one end side is blocked, a first cylinder 10, a second cylinder 20, and a reducer supply pipe 30. The first cylinder 10 and the second cylinder 20 are arranged on a side wall section of the casing 1 with lining up in a diagonal direction. The reducer supply pipe 30 is inserted toward the first cylinder 10 from a side wall near the second cylinder 20 of the side wall of the casing 1, and is connected in a circumference tangential direction of the first cylinder 10. A ventilation hole 10a is formed on a region in opposite side of a region to which the reducer supply pipe 30 is connected, in a region at a downstream side of the region to which the reducer supply pipe 30 is connected in the side wall of the first cylinder 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、排気浄化機能付き消音装置に関し、特に、内部の排気流通路に折返部を有し、当該排気流通路が、折返部より上流側の上流側排気流通路と、折返部より下流側の下流側排気流通路と、に区画された排気浄化機能付き消音装置に関する。   The present invention relates to a silencer with an exhaust purification function, and in particular, has an internal exhaust flow passage with a folded portion, and the exhaust flow passage is upstream from the folded portion, and downstream from the folded portion. It is related with the silencer with an exhaust gas purification function divided into the downstream exhaust flow path of the.

排気浄化機能付き消音装置は、内燃機関から排出された排気ガスによる騒音を低減するための消音装置であって、還元触媒の作用によって排気ガスを浄化する機能を備えたものである。近年、かかる排気浄化機能付き消音装置として、例えば、ディーゼルエンジンから排出された排気ガス中に含まれるNOxを低減する機能を備えたSCR内蔵マフラが開発されている。このSCR内蔵マフラは、内部の排気流通路に液体還元剤(例えば、尿素水等)を噴射供給し、選択還元触媒(Selective Catalytic Reduction)の作用によって排気ガス中に含まれるNOxを低減するとともに、排気ガスによる騒音を低減する装置である。   The silencer with an exhaust purification function is a silencer for reducing noise caused by exhaust gas discharged from an internal combustion engine, and has a function of purifying exhaust gas by the action of a reduction catalyst. In recent years, as such a silencer with an exhaust purification function, for example, an SCR built-in muffler having a function of reducing NOx contained in exhaust gas discharged from a diesel engine has been developed. The SCR built-in muffler injects and supplies a liquid reducing agent (for example, urea water or the like) to an internal exhaust flow passage, and reduces NOx contained in the exhaust gas by the action of a selective catalytic reduction (Selective Catalytic Reduction). This device reduces noise caused by exhaust gas.

ところで、このような装置を車載するには、その構造上、液体還元剤を噴射供給する位置から還元触媒までの排気ガスの流路長を限定し、短い距離にせざるを得ない。そこで、かかる排気浄化機能付き消音装置として、従来より、内部の排気流通路に折返部を有し、当該排気流通路が、折返部より上流側の上流側排気流通路と、折返部より下流側の下流側排気流通路と、に区画されたものが開発されている(例えば、下記特許文献1参照)。   By the way, in order to mount such a device on the vehicle, the length of the exhaust gas flow path from the position where the liquid reducing agent is injected and supplied to the reduction catalyst is limited to a short distance. Therefore, as such a silencer with an exhaust purification function, conventionally, an internal exhaust flow passage has a folded portion, and the exhaust flow passage is upstream of the folded portion and downstream of the folded portion. A downstream exhaust flow passage has been developed (see, for example, Patent Document 1 below).

しかし、かかる排気浄化機能付き消音装置にあっては、折返部で排気ガスの流れ方向を強制的に変える構造となっているため、排気ガスの流れに偏りが生じる。従って、この排気ガスに供給された液体還元剤が排気流通路内に十分に分散されず、排気ガスと液体還元剤とが十分に混合されないまま不均一な状態で還元触媒に供給されることとなる。その結果、還元触媒における排気ガスの浄化効率が低減してしまう。   However, such a silencer with an exhaust purification function has a structure in which the flow direction of the exhaust gas is forcibly changed at the turn-back portion, so that the flow of the exhaust gas is biased. Therefore, the liquid reducing agent supplied to the exhaust gas is not sufficiently dispersed in the exhaust flow passage, and the exhaust gas and the liquid reducing agent are supplied to the reduction catalyst in a non-uniform state without being sufficiently mixed. Become. As a result, the exhaust gas purification efficiency in the reduction catalyst is reduced.

そこで、従来の技術にあっては、排気流通路内にミキサ構造体を設けて、排気ガスの流れを改善するとともに、排気ガスと液体還元剤とが十分に混合されるようにしている。これにより、排気ガスと液体還元剤とが均一な状態で還元触媒に供給されるようになり、還元触媒における排気ガスの浄化効率の低減を防止することが可能となる。
特許第3715981号公報
Therefore, in the conventional technique, a mixer structure is provided in the exhaust flow passage to improve the flow of the exhaust gas, and the exhaust gas and the liquid reducing agent are sufficiently mixed. As a result, the exhaust gas and the liquid reducing agent are supplied to the reduction catalyst in a uniform state, and it is possible to prevent a reduction in the exhaust gas purification efficiency in the reduction catalyst.
Japanese Patent No. 3715981

しかしながら、折返部を有する排気浄化機能付き消音装置において、従来の技術の如く、排気流通路内にミキサ構造体を設ける場合には、当該装置の製造工程が複雑なものとなり、製造コストが著しく増加してしまう。   However, if the mixer structure is provided in the exhaust flow passage in the silencer with an exhaust purification function having a turning portion as in the prior art, the manufacturing process of the device becomes complicated and the manufacturing cost increases remarkably. Resulting in.

本発明は、上記問題に鑑みてなされたものであり、排気流通路内にミキサ構造体を設けることなく、排気ガスの流れを改善するとともに、排気ガスと液体還元剤とが十分に混合されるようにし、還元触媒における排気ガスの浄化効率の低減を防止することが可能な排気浄化機能付き消音装置を提供することを目的とする。   The present invention has been made in view of the above problems, and improves the flow of exhaust gas without providing a mixer structure in the exhaust flow passage, and the exhaust gas and the liquid reducing agent are sufficiently mixed. Thus, an object of the present invention is to provide a silencer with an exhaust purification function capable of preventing a reduction in exhaust gas purification efficiency in a reduction catalyst.

上記課題を解決するために、本発明は、内部の排気流通路に折返部を有し、当該排気流通路が、前記折返部より上流側の上流側排気流通路と、前記折返部より下流側の下流側排気流通路と、に区画された排気浄化機能付き消音装置であって、一端側が閉塞された略箱型のケーシングと、一端側の側壁に通気孔が形成され、当該一端側が前記ケーシングの閉塞部に接続された状態で前記ケーシング内に設けられ、内部に前記上流側排気流通路が形成された第一の円筒と、一端側に還元触媒が配置され、当該一端側が前記閉塞部から離間された状態で前記ケーシング内に設けられ、内部に前記下流側排気流通路が形成された第二の円筒と、一端側が前記第一の円筒に接続されるとともに、他端側が前記ケーシング外に配置され、当該他端側に液体還元剤を前記第一の円筒内に向けて噴射供給する噴射ノズルが設けられた還元剤供給管と、を備え、
前記第一の円筒と前記第二の円筒とが、前記ケーシングの側壁断面において対角方向に並ぶように配置され、前記還元剤供給管が、前記ケーシングの側壁のうち前記第二の円筒に近い側の側壁から前記第一の円筒に向けて挿入された状態で、当該第一の円筒の円周接線方向に接続され、前記通気孔が、前記第一の円筒の側壁のうち前記還元剤供給管が接続された領域よりも下流側の領域で、且つ当該還元剤供給管が接続された領域と反対側の領域に形成されていることを特徴とする。
In order to solve the above-mentioned problem, the present invention has a folded portion in an internal exhaust flow passage, and the exhaust flow passage includes an upstream exhaust flow passage upstream of the folded portion and a downstream side of the folded portion. A silencer with an exhaust purification function, which is partitioned into a downstream exhaust flow passage, and has a substantially box-shaped casing closed at one end, and a vent hole formed in a side wall at one end, the one end being the casing The first cylinder is provided in the casing in a state of being connected to the closed portion, and the upstream exhaust flow passage is formed therein, and a reduction catalyst is disposed on one end side, and the one end side extends from the closed portion. A second cylinder provided in the casing in a separated state and having the downstream exhaust flow passage formed therein, one end side being connected to the first cylinder, and the other end side being outside the casing Placed and liquid on the other end side And a reducing agent supply pipe injecting and supplying the injection nozzle is provided towards the said first cylinder to Motozai,
The first cylinder and the second cylinder are arranged in a diagonal direction in a side wall cross section of the casing, and the reducing agent supply pipe is close to the second cylinder among the side walls of the casing. In the state of being inserted from the side wall toward the first cylinder, it is connected in the circumferential tangential direction of the first cylinder, and the vent hole is provided with the reducing agent in the side wall of the first cylinder. It is characterized in that it is formed in an area downstream of the area where the pipe is connected and in the area opposite to the area where the reducing agent supply pipe is connected.

また、本発明において、前記還元剤供給管は、その他端側が前記第二の円筒側に傾斜するように配置されていることを特徴とする。   Moreover, in this invention, the said reducing agent supply pipe | tube is arrange | positioned so that the other end side may incline to the said 2nd cylinder side.

本発明の排気浄化機能付き消音装置によれば、排気流通路内にミキサ構造体を設けることなく、排気ガスの流れを改善するとともに、排気ガスと液体還元剤とが十分に混合されるようにし、還元触媒における排気ガスの浄化効率の低減を防止することが可能となる。   According to the silencer with an exhaust purification function of the present invention, the flow of the exhaust gas is improved without providing the mixer structure in the exhaust flow passage, and the exhaust gas and the liquid reducing agent are sufficiently mixed. Further, it is possible to prevent the exhaust gas purification efficiency from being reduced in the reduction catalyst.

以下、図1及び図2を参照しながら、本発明の各実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

===第一実施形態===
図1は、本発明の第一実施形態に係る排気浄化機能付き消音装置100、並びにその内部における排気ガス及び尿素水の流れを示す図である。図1(a)は排気浄化機能付き消音装置100の閉塞部側から排気ガスと尿素水の流れを見た図、図1(b)は排気浄化機能付き消音装置100の側壁側から排気ガスと尿素水の流れを見た図である。
=== First Embodiment ===
FIG. 1 is a diagram showing a silencer 100 with an exhaust purification function according to a first embodiment of the present invention, and the flow of exhaust gas and urea water therein. FIG. 1A is a view of the flow of exhaust gas and urea water from the closed portion side of the silencer 100 with the exhaust purification function, and FIG. 1B is the exhaust gas from the side wall side of the silencer 100 with the exhaust purification function. It is the figure which looked at the flow of urea water.

<排気浄化機能付き消音装置100の構成>
まず、排気浄化機能付き消音装置100の構成について説明する。
図1に示すように、排気浄化機能付き消音装置100は、内部の排気流通路50に折返部51を有し、排気流通路50が、折返部51より上流側の上流側排気流通路50aと、折返部51より下流側の下流側排気流通路50bと、に区画されている。この排気浄化機能付き消音装置100は、ケーシング1と、第一の円筒10と、第二の円筒20と、還元剤供給管30とを備えている。
<Configuration of Silencer 100 with Exhaust Purification Function>
First, the configuration of the silencer 100 with the exhaust purification function will be described.
As shown in FIG. 1, the silencer 100 with the exhaust purification function has a folded portion 51 in an internal exhaust flow passage 50, and the exhaust flow passage 50 is connected to an upstream exhaust flow passage 50 a upstream of the folded portion 51. , And is divided into a downstream side exhaust flow passage 50b downstream of the folded portion 51. The silencer 100 with the exhaust purification function includes a casing 1, a first cylinder 10, a second cylinder 20, and a reducing agent supply pipe 30.

ケーシング1は、略箱型であり、一端側が閉塞されて閉塞部1aが形成されている。ケーシング1の内部には、仕切板2,3が設けられており、この仕切板2,3によって第一の円筒10と第二の円筒20がケーシング1内に支持固定されている。これら第一の円筒10と第二の円筒20は、ケーシング1の側壁断面(図1(a)参照)においてその対角方向に並ぶように配置され、より具体的には、当該側壁断面の相互に対向する略角部にそれぞれ配置されている。   The casing 1 is substantially box-shaped, and one end side is closed to form a closed portion 1a. Partition plates 2 and 3 are provided in the casing 1, and the first cylinder 10 and the second cylinder 20 are supported and fixed in the casing 1 by the partition plates 2 and 3. The first cylinder 10 and the second cylinder 20 are arranged so as to be aligned in the diagonal direction in the side wall cross section of the casing 1 (see FIG. 1A). Are disposed at substantially corners facing each other.

第一の円筒10は、一端側の側壁に通気孔10aが形成され、当該一端側がケーシング1の閉塞部1aに接続された状態でケーシング1内に設けられ、その内部に上流側排気流通路50aが形成されている。通気孔10aは、この第一の円筒10の側壁のうち還元剤供給管30が接続された領域よりも下流側の領域で、且つ当該還元剤供給管30が接続された領域と反対側の領域を中心に複数形成されている。なお、上流側排気流通路50a内には、上流側から順にDOC(Diesel Oxidation Catalyst)4とDPF(Diesel Particulate Filter)5が配置されている。但し、本発明において、第一の円筒10は、DOC4、DPF5が配置されたものに限定されるものではなく、これらDOC4、DPF5の少なくともいずれか一方が配置されていないものであってもよい。 The first cylinder 10 is provided in the casing 1 with a vent hole 10a formed in the side wall on one end side and connected to the closed portion 1a of the casing 1, and the upstream side exhaust flow passage 50a is provided therein. Is formed. The vent hole 10a is a region on the downstream side of a region where the reducing agent supply pipe 30 is connected in the side wall of the first cylinder 10 and a region opposite to the region where the reducing agent supply tube 30 is connected. A plurality are formed around the center. A DOC (Diesel Oxidation Catalyst) 4 and a DPF (Diesel Particulate Filter) 5 are arranged in this order from the upstream side in the upstream exhaust flow passage 50a. However, in the present invention, the first cylinder 10 is not limited to the one in which the DOC 4 and the DPF 5 are arranged, and at least one of the DOC 4 and the DPF 5 may not be arranged.

第二の円筒20は、一端側にSCR6が配置され、当該一端側が閉塞部1aから離間された状態でケーシング1内に設けられ、その内部に下流側排気流通路50bが形成されている。この下流側排気流通路50b内には、SCR6の下流側にNHスリップ7が配置されている。但し、本発明において、第二の円筒20は、SCR6、NHスリップ7が配置されたものに限定されるものではなく、例えば、SCR6の代わりに他の還元触媒が配置されたものであってもよく、また、NHスリップ7が配置されていないものであってもよい。 The second cylinder 20 is provided with the SCR 6 on one end side, provided in the casing 1 in a state where the one end side is separated from the closing portion 1a, and a downstream exhaust flow passage 50b is formed therein. An NH 3 slip 7 is disposed on the downstream side of the SCR 6 in the downstream exhaust flow passage 50b. However, in the present invention, the second cylinder 20 is not limited to the one in which the SCR 6 and the NH 3 slip 7 are arranged. For example, another reduction catalyst is arranged in place of the SCR 6. Alternatively, the NH 3 slip 7 may not be disposed.

還元剤供給管30は、一端側が第一の円筒10に接続されるとともに、他端側がケーシング1外に配置され、当該他端側に尿素水8を第一の円筒10内に向けて噴射供給する噴射ノズル31が設けられている。この還元剤供給管30は、ケーシング1の側壁のうち第二の円筒20が配置された側から第一の円筒10に対して直交するように挿入され、当該第一の円筒10の円周接線方向に接続されている。なお、還元剤供給管30の径は、第一の円筒10の径よりも小さく、同図に示すケーシング1の中心線と平行に配置されている。   The reducing agent supply pipe 30 has one end connected to the first cylinder 10 and the other end arranged outside the casing 1. The urea water 8 is injected and supplied to the other end on the other side of the first cylinder 10. An injection nozzle 31 is provided. The reducing agent supply pipe 30 is inserted so as to be orthogonal to the first cylinder 10 from the side where the second cylinder 20 is disposed on the side wall of the casing 1, and the circumferential tangent of the first cylinder 10. Connected in the direction. In addition, the diameter of the reducing agent supply pipe 30 is smaller than the diameter of the first cylinder 10 and is arranged in parallel with the center line of the casing 1 shown in FIG.

<排気ガスと尿素水の流れ>
次に、排気浄化機能付き消音装置100の内部における排気ガスと尿素水8の流れについて説明する。
<Flow of exhaust gas and urea water>
Next, the flow of exhaust gas and urea water 8 in the silencer 100 with the exhaust purification function will be described.

内燃機関から排出された排気ガスは、排気浄化機能付き消音装置100の内部に流入し、上流側排気流通路50aに配置されたDOC4及びDPF5を通過する。排ガス中に含まれていたNOは、DOC4で酸化されてNOとなる。また、排ガス中に含まれていたPMは、DPF5で捕集されて排気ガスから除去される。そして、DOC4及びDPF5を通過した排気ガスに対し、還元剤供給管30の噴射ノズル31から尿素水8が噴射供給される。この還元剤供給管30は、前述した通り、第一の円筒10に対して直交するように配置され、当該第一の円筒10の円周接線方向に接続されているので、噴射供給された尿素水8は、第一の円筒10に流入する際に、第一の円筒10の内壁面に沿った旋回流を形成し、上流側排気流通路50aを流れる。DOC4及びDPF5を通過した排気ガスは、折返部51付近を通過する際に、旋回流を形成した尿素水8と攪拌混合される。 The exhaust gas discharged from the internal combustion engine flows into the silencer 100 with the exhaust purification function, and passes through the DOC 4 and the DPF 5 arranged in the upstream exhaust flow passage 50a. NO contained in the exhaust gas becomes oxidized in the NO 2 at DOC 4. Further, PM contained in the exhaust gas is collected by the DPF 5 and removed from the exhaust gas. Then, urea water 8 is injected and supplied from the injection nozzle 31 of the reducing agent supply pipe 30 to the exhaust gas that has passed through the DOC 4 and the DPF 5. As described above, the reducing agent supply pipe 30 is arranged so as to be orthogonal to the first cylinder 10 and is connected in the circumferential tangential direction of the first cylinder 10. When the water 8 flows into the first cylinder 10, it forms a swirling flow along the inner wall surface of the first cylinder 10 and flows through the upstream exhaust flow passage 50a. The exhaust gas that has passed through the DOC 4 and the DPF 5 is stirred and mixed with the urea water 8 that has formed a swirl flow when passing through the vicinity of the turning portion 51.

尿素水8と攪拌混合された排気ガスは、閉塞部1aの壁面で堰き止められ、通気孔10aから第一の円筒10の外部に流出する。その際、尿素水8と攪拌混合された排気ガスは、折返部51付近で旋回しながら強制的に流れ方向を変えられ、通気孔10aによって均一に分散された状態となる。そして、この排気ガスは、旋回しながら第二の円筒20の開口端部からその内部に流入し、下流側排気流通路50bを流れ、均一に分散された状態でSCR6及びNHスリップ7を通過する。なお、排ガス中に含まれていたNOx(NOを含む)は、SCR6で還元浄化されてNとなる。また、SCR6で消費されずに排ガス中に残存する尿素水8及びNHは、NHスリップ7で吸着されて排ガスから除去され、若しくはNHスリップ7で酸化浄化されてNとなる。SCR6及びNHスリップ7を通過して浄化された排ガスは、排気浄化機能付き消音装置100の外部に流出する。 The exhaust gas stirred and mixed with the urea water 8 is blocked by the wall surface of the blocking portion 1a and flows out of the first cylinder 10 through the vent hole 10a. At that time, the exhaust gas stirred and mixed with the urea water 8 is forced to change the flow direction while swirling in the vicinity of the turning portion 51, and is uniformly dispersed by the vent holes 10a. Then, the exhaust gas flows into the inside of the opening of the second cylinder 20 while turning, flows through the downstream exhaust flow passage 50b, and passes through the SCR 6 and the NH 3 slip 7 in a uniformly dispersed state. To do. Note that NOx (including NO 2 ) contained in the exhaust gas is reduced and purified by the SCR 6 to become N 2 . The urea water 8 and NH 3 remaining in the exhaust gas without being consumed by the SCR 6 are adsorbed by the NH 3 slip 7 and removed from the exhaust gas, or oxidized and purified by the NH 3 slip 7 to become N 2 . The exhaust gas purified through the SCR 6 and the NH 3 slip 7 flows out of the silencer 100 with the exhaust purification function.

以上の通り、排気浄化機能付き消音装置100にあっては、従来の技術の如くミキサ構造体を設けることなくとも、折返部51における排気ガスの流れが改善され、排気ガスと尿素水8とが十分に混合された状態になる。その結果、排気ガスと尿素水8とが均一に分散された状態でSCR6に供給されるようになる。これにより、SCR6における排気ガスの浄化効率の低減を防止することが可能となる。   As described above, in the silencer 100 with the exhaust purification function, the flow of the exhaust gas in the folded portion 51 is improved without providing the mixer structure as in the conventional technique, and the exhaust gas and the urea water 8 are separated. It is in a fully mixed state. As a result, the exhaust gas and the urea water 8 are supplied to the SCR 6 in a uniformly dispersed state. As a result, it is possible to prevent the exhaust gas purification efficiency of the SCR 6 from being reduced.

なお、図1(a)に示す如く、第一の円筒10及び第二の円筒20の配置を適宜設計し、第一の円筒10と第二の円筒20とのオフセット距離(R)が、できる限り長くなるようにしておくことが好ましい。オフセット距離(R)が長くなると、同図に示す空間A及び空間Bの領域がいずれも広がる。空間A及び空間Bは、ケーシング1と第一の円筒10及び第二の円筒20で囲まれた空間を示す。空間Aは、その空間のうち還元剤供給管30が挿入された側の領域を示し、空間Bは、空間Aと反対側の領域を示す。このように、空間Aの領域を広げておくことにより、尿素水8の旋回力が向上し、また、空間Bの領域を広げておくことにより、通気孔10aを通過した排気ガスの旋回力が向上する。その結果、折返部51における排気ガスの流れがより改善され、排気ガスと尿素水8とが十分に混合された状態になる。   In addition, as shown to Fig.1 (a), arrangement | positioning of the 1st cylinder 10 and the 2nd cylinder 20 is designed suitably, and the offset distance (R) of the 1st cylinder 10 and the 2nd cylinder 20 can be performed. It is preferable to keep it as long as possible. As the offset distance (R) becomes longer, the areas of the space A and the space B shown in FIG. A space A and a space B indicate a space surrounded by the casing 1, the first cylinder 10, and the second cylinder 20. The space A indicates a region on the side where the reducing agent supply pipe 30 is inserted, and the space B indicates a region opposite to the space A. Thus, the swirling force of the urea water 8 is improved by expanding the area of the space A, and the swirling force of the exhaust gas that has passed through the vent hole 10a is increased by expanding the area of the space B. improves. As a result, the flow of the exhaust gas in the turning portion 51 is further improved, and the exhaust gas and the urea water 8 are sufficiently mixed.

===第二実施形態===
図2は、本発明の第二実施形態に係る排気浄化機能付き消音装置200及びその内部における排気ガスと尿素水の流れを示す図である。なお、図2において、図1と同一若しくは類似の箇所には同一の符号を付すこととし、図1と異なる箇所を中心に説明する。
=== Second Embodiment ===
FIG. 2 is a view showing the silencer 200 with the exhaust purification function according to the second embodiment of the present invention and the flow of exhaust gas and urea water therein. In FIG. 2, the same or similar parts as those in FIG.

図2に示すように、排気浄化機能付き消音装置200は、図1に示した排気浄化機能付き消音装置100とほぼ同じ構成する。しかし、この排気浄化機能付き消音装置200は、排気浄化機能付き消音装置100と異なり、還元剤供給管30の他端側が、第二の円筒20側に傾斜するように配置されている。   As shown in FIG. 2, the silencer 200 with an exhaust purification function has substantially the same configuration as the silencer 100 with an exhaust purification function shown in FIG. However, unlike the silencer 100 with the exhaust purification function, the silencer 200 with the exhaust purification function is arranged so that the other end side of the reducing agent supply pipe 30 is inclined toward the second cylinder 20 side.

具体的には、噴射ノズル31が設けられている還元剤供給管30の他端側が、図2(a)に示すケーシング1の中心線側に傾斜した状態で、第一の円筒10に接続されている。また、この第一の円筒10に形成される通気孔10aは、図1に示した通気孔10aの場合よりも、閉塞部1a側よりの領域を中心に複数形成されている。そして、還元剤供給管30の円筒長(X)は、図1に示した還元剤供給管30のそれ(X)よりも長く(X>X)なるように構成されている。 Specifically, the other end side of the reducing agent supply pipe 30 provided with the injection nozzle 31 is connected to the first cylinder 10 in a state inclined to the center line side of the casing 1 shown in FIG. ing. Further, a plurality of vent holes 10a formed in the first cylinder 10 are formed around the area from the closed portion 1a side as compared with the case of the vent hole 10a shown in FIG. The cylindrical length (X 2 ) of the reducing agent supply pipe 30 is configured to be longer (X 2 > X 1 ) than that (X 1 ) of the reducing agent supply pipe 30 shown in FIG.

このような構成とした場合には、還元剤供給管30を介して第一の円筒10内に噴射供給された尿素水8の旋回力が向上するとともに、通気孔10aを通過した排気ガスの旋回力が向上する。その結果、従来の技術の如くミキサ構造体を設けることなくとも、折返部51における排気ガスの流れがより改善され、排気ガスと尿素水8とが十分に混合された状態になる。従って、排気ガスと尿素水8とがよりいっそう均一に分散された状態でSCR6に供給されるようになる。これにより、SCR6における排気ガスの浄化効率の低減を防止することが容易となる。   In such a configuration, the turning force of the urea water 8 injected and supplied into the first cylinder 10 through the reducing agent supply pipe 30 is improved, and the turning of the exhaust gas that has passed through the vent hole 10a. Power is improved. As a result, without providing a mixer structure as in the prior art, the flow of exhaust gas in the folded portion 51 is further improved, and the exhaust gas and the urea water 8 are sufficiently mixed. Therefore, the exhaust gas and the urea water 8 are supplied to the SCR 6 in a more uniformly dispersed state. Thereby, it becomes easy to prevent the reduction of the exhaust gas purification efficiency in the SCR 6.

また、このような構成とした場合には、尿素水8及び排気ガスの旋回力を維持しつつ、しかも還元剤供給管30から閉塞部1aまでの距離(Y)を、図1に示した構成とした場合の距離(Y)よりも短く(Y<Y)することも可能となり、その結果、折返部51の領域を小さくすることができる。これにより、排気浄化機能付き消音装置200を、排気浄化機能付き消音装置100よりもコンパクトにすることが可能となる。 Further, in the case of such a configuration, the distance (Y 2 ) from the reducing agent supply pipe 30 to the closing portion 1a is shown in FIG. 1 while maintaining the turning force of the urea water 8 and the exhaust gas. It is also possible to make the distance (Y 2 <Y 1 ) shorter than the distance (Y 1 ) when configured, and as a result, the area of the folded portion 51 can be reduced. Thereby, the silencer 200 with the exhaust purification function can be made more compact than the silencer 100 with the exhaust purification function.

本発明の第一実施形態に係る排気浄化機能付き消音装置を示す図である。It is a figure showing a silencer with an exhaust purification function concerning a first embodiment of the present invention. 本発明の第二実施形態に係る排気浄化機能付き消音装置を示す図である。It is a figure which shows the silencer with an exhaust gas purification function which concerns on 2nd embodiment of this invention.

符号の説明Explanation of symbols

1 ケーシング
6 SCR
8 尿素水
10 第一の円筒
10a 通気孔
20 第二の円筒
30 還元剤供給管
31 噴射ノズル
50 排気流通路
51 折返部
100,200 排気浄化機能付き消音装置
1 Casing 6 SCR
8 Urea water 10 1st cylinder 10a Vent 20 20 2nd cylinder 30 Reducing agent supply pipe 31 Injection nozzle 50 Exhaust flow passage 51 Folding part 100,200 Silencer with exhaust purification function

Claims (2)

内部の排気流通路に折返部を有し、当該排気流通路が、前記折返部より上流側の上流側排気流通路と、前記折返部より下流側の下流側排気流通路と、に区画された排気浄化機能付き消音装置であって、
一端側が閉塞された略箱型のケーシングと、
一端側の側壁に通気孔が形成され、当該一端側が前記ケーシングの閉塞部に接続された状態で前記ケーシング内に設けられ、内部に前記上流側排気流通路が形成された第一の円筒と、
一端側に還元触媒が配置され、当該一端側が前記閉塞部から離間された状態で前記ケーシング内に設けられ、内部に前記下流側排気流通路が形成された第二の円筒と、
一端側が前記第一の円筒に接続されるとともに、他端側が前記ケーシング外に配置され、当該他端側に液体還元剤を前記第一の円筒内に向けて噴射供給する噴射ノズルが設けられた還元剤供給管と、
を備え、
前記第一の円筒と前記第二の円筒とが、前記ケーシングの側壁断面においてその対角方向に並ぶように配置され、
前記還元剤供給管が、前記ケーシングの側壁のうち前記第二の円筒に近い側の側壁から前記第一の円筒に向けて挿入された状態で、当該第一の円筒の円周接線方向に接続され、
前記通気孔が、前記第一の円筒の側壁のうち前記還元剤供給管が接続された領域よりも下流側の領域で、且つ当該還元剤供給管が接続された領域と反対側の領域に形成されていることを特徴とする排気浄化機能付き消音装置。
An internal exhaust flow passage has a folded portion, and the exhaust flow passage is partitioned into an upstream exhaust flow passage upstream of the folded portion and a downstream exhaust flow passage downstream of the folded portion. A silencer with an exhaust purification function,
A substantially box-shaped casing whose one end is closed;
A first cylinder in which a vent hole is formed in a side wall on one end side, the one end side is provided in the casing in a state of being connected to a closed portion of the casing, and the upstream exhaust flow passage is formed therein;
A second catalyst in which a reduction catalyst is disposed on one end side, the one end side is provided in the casing in a state of being separated from the closing portion, and the downstream exhaust flow passage is formed therein;
One end side is connected to the first cylinder, the other end side is disposed outside the casing, and an injection nozzle for supplying the liquid reducing agent into the first cylinder is provided on the other end side. A reducing agent supply pipe;
With
The first cylinder and the second cylinder are arranged so as to be aligned in a diagonal direction in a side wall cross section of the casing,
The reducing agent supply pipe is connected in the circumferential tangential direction of the first cylinder with the reducing agent supply pipe inserted from the side wall of the casing closer to the second cylinder toward the first cylinder. And
The vent hole is formed in a region on the downstream side of the region where the reducing agent supply pipe is connected, on the side wall of the first cylinder, and in a region opposite to the region where the reducing agent supply tube is connected. A muffler with an exhaust purification function, characterized in that
請求項1において、
前記還元剤供給管は、その他端側が前記第二の円筒側に傾斜するように配置されていることを特徴とする排気浄化機能付き消音装置。
In claim 1,
The silencer with an exhaust purification function, wherein the reducing agent supply pipe is disposed so that the other end side is inclined toward the second cylinder side.
JP2007089441A 2007-03-29 2007-03-29 Muffler with exhaust emission control function Pending JP2008248746A (en)

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JP2010116864A (en) * 2008-11-13 2010-05-27 Mitsubishi Motors Corp Exhaust system structure of engine
WO2010079847A1 (en) * 2009-01-09 2010-07-15 トヨタ自動車株式会社 Exhaust gas purification device for an internal combustion engine
WO2010089924A1 (en) * 2009-02-03 2010-08-12 ヤンマー株式会社 Exhaust purification apparatus
JP2012225316A (en) * 2011-04-22 2012-11-15 Mitsubishi Fuso Truck & Bus Corp Exhaust gas emission control device of internal combustion engine
JP2012229649A (en) * 2011-04-26 2012-11-22 Toyota Motor Corp Exhaust emission control system of internal combustion engine
CN104747256A (en) * 2013-12-27 2015-07-01 陕西汽车集团有限责任公司 Urea mixer in exhaust gas emission system of diesel car
EP2529091B1 (en) 2010-01-25 2016-04-06 Peugeot Citroën Automobiles SA Exhaust gas aftertreatment device of an internal combustion engine
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010116864A (en) * 2008-11-13 2010-05-27 Mitsubishi Motors Corp Exhaust system structure of engine
JP5163755B2 (en) * 2009-01-09 2013-03-13 トヨタ自動車株式会社 Exhaust gas purification device for internal combustion engine
US9145810B2 (en) 2009-01-09 2015-09-29 Toyota Jidosha Kabushiki Kaisha Device for purifying exhaust gas of an internal combustion engine
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WO2010079847A1 (en) * 2009-01-09 2010-07-15 トヨタ自動車株式会社 Exhaust gas purification device for an internal combustion engine
KR101331086B1 (en) * 2009-01-09 2013-11-19 도요타 지도샤(주) Device for purifying exhaust gas of an internal combustion engine
CN102272420B (en) * 2009-01-09 2014-07-09 丰田自动车株式会社 Exhaust gas purification device for an internal combustion engine
WO2010089924A1 (en) * 2009-02-03 2010-08-12 ヤンマー株式会社 Exhaust purification apparatus
KR101292627B1 (en) 2009-02-03 2013-08-01 얀마 가부시키가이샤 Exhaust purification apparatus
US8627653B2 (en) 2009-02-03 2014-01-14 Yanmar Co., Ltd. Exhaust purification apparatus
EP2529091B1 (en) 2010-01-25 2016-04-06 Peugeot Citroën Automobiles SA Exhaust gas aftertreatment device of an internal combustion engine
JP2012225316A (en) * 2011-04-22 2012-11-15 Mitsubishi Fuso Truck & Bus Corp Exhaust gas emission control device of internal combustion engine
JP2012229649A (en) * 2011-04-26 2012-11-22 Toyota Motor Corp Exhaust emission control system of internal combustion engine
CN104747256A (en) * 2013-12-27 2015-07-01 陕西汽车集团有限责任公司 Urea mixer in exhaust gas emission system of diesel car
JP2018165477A (en) * 2017-03-28 2018-10-25 いすゞ自動車株式会社 Exhaust emission control device of internal combustion engine

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