WO2016146015A1 - 混合管及其排气处理装置 - Google Patents

混合管及其排气处理装置 Download PDF

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Publication number
WO2016146015A1
WO2016146015A1 PCT/CN2016/076038 CN2016076038W WO2016146015A1 WO 2016146015 A1 WO2016146015 A1 WO 2016146015A1 CN 2016076038 W CN2016076038 W CN 2016076038W WO 2016146015 A1 WO2016146015 A1 WO 2016146015A1
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Prior art keywords
mixing tube
tube
mixing
mixer
treatment device
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PCT/CN2016/076038
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English (en)
French (fr)
Inventor
王林
曹刚
李硕
王平
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天纳克（苏州）排放系统有限公司
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Publication of WO2016146015A1 publication Critical patent/WO2016146015A1/zh

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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
    • 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
    • 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
    • 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 invention relates to a mixing tube and an exhaust gas treatment device thereof, and belongs to the technical field of engine exhaust aftertreatment.
  • the uniformity of ammonia distribution in the exhaust aftertreatment system (eg, selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the ammonia distribution is uneven, it will lead to excessive ammonia in the local area and easy to cause ammonia leakage, while in other thin ammonia regions, the nitrogen oxide (NOx) conversion efficiency is too low. Uneven distribution of ammonia over a long period of time can result in uneven aging of the catalyst, thereby affecting the overall performance of the catalyst. In addition, the uneven distribution of urea droplets may cause the local tube wall or mixed structure temperature to be too low to form crystallization, which may block the exhaust pipe when severe, resulting in a decrease in engine power performance.
  • SCR system selective catalytic reduction system
  • An object of the present invention is to provide a mixing tube which is simple in structure and uniform in mixing, and an exhaust gas treatment device having the same.
  • a mixing tube for use in an engine exhaust treatment device the mixing tube has a hollow structure, and one end of the mixing tube is formed with an air flow inlet, and the mixing tube is The other end is blocked; the end surface of the mixing tube is spiral, and the outer wall of the mixing tube is provided with an airflow outlet extending in the axial direction to form an exhaust swirl.
  • the end face having a spiral shape is formed by connecting a plurality of arcs whose curvature radii are sequentially increased.
  • the mixing tube includes a first semi-circular tube and a second semi-circular tube that cooperate with each other, and the first semi-circular tube has a different radius from the second semi-circular tube, and the first semi-circular tube Connected to one side of the second semicircular tube, the first semicircular tube and the other side of the second semicircular tube are radially offset from each other to form the gas flow outlet.
  • the mixing tube surrounds at least one turn.
  • the present invention also provides an exhaust treatment device including a housing to be mounted to a plurality of partitions in the housing, the plurality of partitions including a first partition and a second partition, the housing including a first cavity upstream of the first spacer a second cavity between the first partition and the second partition, and a third cavity downstream of the second partition, wherein the exhaust treatment device further includes a mixer in a chamber, a mixing tube in the second chamber, and a selective catalytic reduction module located downstream of the third chamber, wherein the mixer is in communication with the mixing tube
  • the mixing tube is the above-mentioned mixing tube.
  • the mixer has a hollow cylindrical shape, and has a plurality of outward flanges on the circumference and a plurality of openings corresponding to the flanges, the flanges are arranged obliquely to exhaust A swirl can be formed when entering the mixer from the opening.
  • the mixer is provided with an internal mixing chamber, and the mixing chamber is in communication with the opening;
  • the exhaust treatment device further includes a housing mounted on the housing and used along A nozzle that injects a urea solution axially into the mixing chamber.
  • the first partition plate is not provided with a perforation at a periphery of the mixer; the second partition plate is provided with a plurality of perforations at a periphery of the mixing tube, and the perforations are
  • the third chamber is in communication; the second partition seals the other end of the mixing tube such that exhaust gas entering the mixing tube can only exit from the gas flow outlet.
  • the casing is provided with an exhaust gas inlet at an end thereof, the mixer and the exhaust gas inlet are offset from each other in the axial direction, and the mixer is mixed with the mixer.
  • the tubes are aligned with each other in the axial direction.
  • the mixing tube of the present invention is spiraled to form an exhaust swirl, thereby increasing the stroke of the airflow in a limited space, increasing the distance of evaporation of the urea droplets, increasing the evaporation rate, and improving the mixing. Uniformity reduces the risk of urea crystallization.
  • Figure 1 is a perspective view of an exhaust gas treatment device of the present invention.
  • Figure 2 is a partial exploded perspective view of Figure 1 with the first reactor separated.
  • Figure 3 is a partially exploded perspective view of Figure 2 after removal of the rear end housing.
  • Figure 4 is a perspective view of the hybrid structure of the present invention.
  • Fig. 5 is an exploded perspective view of Fig. 4;
  • Figure 6 is a perspective view of the mixer of Figure 5.
  • Fig. 7 is a front view of Fig. 6, and the direction of rotation of the air flow is indicated by arrows.
  • Figure 8 is a perspective view of the mixing tube of Figure 5.
  • Figure 9 is a side elevational view of Figure 8 taken along an angle.
  • Figure 11 is a side elevational view of the mixing tube of the present invention in another embodiment.
  • Figure 12 is the same angle as Figure 11, and the direction of rotation of the airflow is indicated by arrows.
  • the present invention discloses an exhaust treatment device 100 for treating exhaust gas from an engine.
  • the exhaust treatment device 100 includes a first reactor 1, a mixing structure 2, a second reactor 3, and a third reactor 4.
  • the first reactor 1, the second reactor 3, and the third reactor 4 are sequentially arranged in the flow direction of the exhaust gas.
  • the first reactor 1 is an oxidation catalyst (DOC)
  • the second reactor 3 is a selective oxidation catalytic module (SCR)
  • the third reactor 4 is an ammonia leakage catalyst. Module (ASC).
  • DOC oxidation catalyst
  • SCR selective oxidation catalytic module
  • ASC ammonia leakage catalyst.
  • the hybrid structure 2 includes a housing 21 , a plurality of partitions 22 mounted in the housing 21 , a mixer 23 located in the housing 21 , and a mixing tube 24 .
  • the housing 21 is cylindrical in shape and includes an exhaust inlet 210 in communication with the first reactor 1.
  • the housing 21 also includes an end plate 211 on one side.
  • the plurality of partitions 22 include a first partition 221 and a second partition 222.
  • the housing 21 includes a first cavity 251 located upstream of the first spacer 221 and a second portion between the first spacer 221 and the second spacer 222. a cavity 252 and a third cavity 253 located downstream of the second spacer 222.
  • the mixer 23 is located in the first cavity 251 and is erected between the end plate 211 and the first partition 221 .
  • the mixing tube 24 is located in the second cavity 252 and is erected between the first partition 221 and the second partition 222.
  • the second reactor 3 is located downstream of the third cavity 253.
  • the housing 21 further includes a first inspection window 261 corresponding to the first cavity 251 and a second inspection window 262 corresponding to the second cavity 252.
  • both the mixer 23 and the mixing tube 24 are two.
  • the exhaust inlet 210 of the housing 21 is offset from the axis of the housing 21, and in the embodiment shown in Figure 3, the exhaust inlet 210 is biased upward. With this arrangement, it is possible to flow a sufficient space in the lower portion of the end plate 211 for mounting the nozzle 26.
  • the number of nozzles 26 is two (only one is shown schematically in Figure 3), the number of nozzles 26 being the same as the number of said mixers 23.
  • the mixer 23 has a hollow cylindrical shape with a plurality of outward flanges 231 on the circumference and corresponding to the flanges 231 .
  • the flange 231 is obliquely arranged to form a swirl flow when the exhaust gas enters the mixer 23 from the opening 232 (shown by the arrow in Fig. 7).
  • the mixer 23 is provided with a mixing chamber 233 located inside, which is in communication with the opening 232.
  • the nozzle 26 mounted on the end plate 211 sprays the atomized urea solution axially into the mixing chamber 233.
  • the swirling exhaust gas can be more fully mixed with the urea spray droplets after entering the mixing chamber 233, thereby improving the mixing uniformity, accelerating the evaporation of the urea droplets, forming a uniform ammonia distribution, thereby improving the conversion efficiency of NOx and reducing the urea crystallization. risks of.
  • the mixer 23 is also offset from the axis of the housing 21.
  • the mixer 23 is biased toward the lower portion of the first cavity 251 to form a larger mixing space at the upper portion of the first cavity 251 to increase the mixing distance. That is, the mixer 23 and the exhaust gas inlet 210 are axially offset from each other.
  • both ends of the mixer 23 are welded to the end plate 211 and the first partition 221, respectively.
  • the first partition plate 221 is provided with a through hole 2211 at a position corresponding to the mixer 23, and the first partition plate 221 is not provided with a perforation at a periphery of the mixer 23.
  • the exhaust gas entering the mixing chamber 233 is mixed with the urea spray droplets and then passed through the perforations 2211 of the first separator 221 into the mixing tube 24.
  • the mixing tube 24 and the mixer 23 are aligned with each other in the axial direction and communicate with each other.
  • the mixing tube 24 has a hollow structure, the end surface of the mixing tube 24 has a spiral shape, and one end of the mixing tube 24 is formed with an air flow.
  • the other end of the mixing tube 24 is blocked.
  • the outer wall of the mixing tube 24 is provided with an air flow outlet 241 extending in the axial direction to form an exhaust swirl (refer to the wide arrow in Fig. 10).
  • the end face having a spiral shape is formed by connecting a plurality of arcs whose curvature radii are sequentially increased.
  • the mixing tube 24 is surrounded by several turns. There is only one airflow outlet 241 to facilitate the formation of a swirl.
  • the mixing tube 24 includes a first semicircular tube 242 and a second semicircular tube 243 that cooperate with each other.
  • the radius R1 of the first semicircular tube 242 is different from the radius R2 of the second semicircular tube 243.
  • the first semicircular tube 242 is coupled to one side of the second semicircular tube 243, and the other side of the first semicircular tube 242 and the second semicircular tube 243 are radially offset from each other to form the Airflow outlet 241.
  • both ends of the mixing tube 24 are welded to the first partition 221 and the second partition 222, respectively.
  • the second partition 222 is provided with a plurality of perforations 2221 at the periphery of the mixing tube 24, and the perforations 2221 are in communication with the third cavity 253; the second partition 222 will be another of the mixing tubes 24.
  • One end (right end in FIG. 3) is sealed such that exhaust gas entering the mixing tube 24 can only exit from the airflow outlet 241.
  • exhaust gas enters the mixing tube 24 from the gas flow inlet 240, and then a swirling flow exits the mixing tube 24 from the gas flow outlet 241.
  • This arrangement increases the stroke of the gas flow in a limited space to increase the distance of evaporation of the urea droplets, increase the evaporation rate, improve the uniformity of mixing, and reduce the risk of urea crystallization.

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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)

Abstract

一种混合管（24），混合管（24）呈中空结构，混合管的一端形成有气流进口，混合管的另一端被堵上；混合管（24）的端面呈螺旋状，混合管（24）的外壁上设有沿轴向延伸的气流出口以形成排气旋流。还公开了一种具有混合管的排气处理装置；该混合管和排气处理装置增加了气流在有限空间内的行程，增加了尿素液滴蒸发的距离，提高了蒸发率，提高了混合的均匀性，降低了尿素结晶的风险。

Description

混合管及其排气处理装置
本申请要求了申请日为2015年3月17日，申请号为201520150098.9，发明名称为“混合管及其排气处理装置”的中国实用新型专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种混合管及其排气处理装置，属于发动机排气后处理技术领域。
背景技术
研究表明排气后处理系统(例如选择性催化还原系统，SCR系统)管路中氨分布的均匀程度对系统的整体性能和耐久性能有重要的影响。如果氨分布不均匀会导致局部区域氨过多从而易造成氨泄漏，而在另一些氨稀薄区域造成氮氧化合物(NOx)转化效率过低。长时间氨的不均匀分布会导致催化剂老化不均匀，从而影响催化剂的整体性能。另外，尿素液滴的不均匀分布会造成局部管壁或混合结构温度过低，形成结晶，严重时会堵塞排气管、导致发动机动力性能下降。
因此，有必要提供一种新型的混合管及其具有该混合管的排气处理装置，以解决上述技术问题。
发明内容
本发明的目的在于提供一种结构简单且混合均匀的混合管以及具有该混合管的排气处理装置。
为实现上述目的，本发明采用如下技术方案：一种混合管，用于发动机排气处理装置中，所述混合管呈中空结构，所述混合管的一端形成有气流进口，所述混合管的另一端被堵上；所述混合管的端面呈螺旋状，所述混合管的外壁上设有沿轴向延伸的气流出口以形成排气旋流。
作为本发明进一步改进的技术方案，呈螺旋状的所述端面是由曲率半径依次增大的多个圆弧连接而成。
作为本发明进一步改进的技术方案，所述混合管包括相互配合的第一半圆管以及第二半圆管，所述第一半圆管与所述第二半圆管的半径不同，所述第一半圆管与所述第二半圆管的一侧连接在一起，所述第一半圆管与所述第二半圆管的另一侧在径向上相互错开以形成所述气流出口。
作为本发明进一步改进的技术方案，所述气流出口仅有一个。
作为本发明进一步改进的技术方案，所述混合管至少环绕一圈。
本发明还提供了一种排气处理装置，其包括壳体以安装于所述壳体内的若干隔板，所述若干隔板包括第一隔板以及第二隔板，所述壳体包括位于所述第一隔板上游的第一腔体、位 于所述第一隔板与所述第二隔板之间的第二腔体、以及位于所述第二隔板下游的第三腔体，其中所述排气处理装置还包括位于所述第一腔体内的混合器、位于所述第二腔体内的混合管以及位于所述第三腔体下游的选择性催化还原模块，其特征在于：所述混合器与所述混合管相连通，所述混合管为上述的混合管。
作为本发明进一步改进的技术方案，所述混合器呈中空的圆柱体状，其圆周上设有若干向外的翻边以及对应这些翻边的若干开口，所述翻边倾斜布置以当排气从所述开口进入所述混合器时能够形成旋流。
作为本发明进一步改进的技术方案，所述混合器设有位于内部的混合腔，所述混合腔与所述开口连通；所述排气处理装置还包括安装在所述壳体上且用以沿轴向向所述混合腔中喷射尿素溶液的喷嘴。
作为本发明进一步改进的技术方案，所述第一隔板在所述混合器的外围没有设置穿孔；所述第二隔板在所述混合管的外围设有若干穿孔，且这些穿孔与所述第三腔体连通；所述第二隔板将所述混合管的另一端密封住，使得进入所述混合管的排气只能从所述气流出口离开。
作为本发明进一步改进的技术方案，所述壳体在其端部设有排气入口，所述混合器与所述排气入口在所述轴向上相互错开，所述混合器与所述混合管在所述轴向上相互对齐。
相较于现有技术，本发明的混合管呈螺旋状以形成排气旋流，因此增加了气流在有限空间内的行程，以增加尿素液滴蒸发的距离，提高了蒸发率，提高了混合的均匀性，降低了尿素结晶的风险。
附图说明
图1是本发明排气处理装置的立体示意图。
图2是图1的部分立体分解图，其中将第一反应器分离出来。
图3是图2去除后端壳体之后的部分立体分解图。
图4是本发明混合结构的立体图。
图5是图4的立体分解图。
图6是图5中混合器的立体图。
图7是图6的主视图，并且用箭头标示出了气流的旋转方向。
图8是图5中混合管的立体图。
图9是图8沿某一角度的侧视图。
图10与图9的角度相同，并用箭头标示出了气流的旋转方向。
图11是本发明的混合管于另一实施方式中的侧视图。
图12与图11的角度相同，并用箭头标示出了气流的旋转方向。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面结合附图和具体实施例对本发明进行详细描述。
请参图1至图5所示，本发明揭示了一种排气处理装置100，用以处理发动机的排气。所述排气处理装置100包括第一反应器1、混合结构2、第二反应器3以及第三反应器4。在本发明图示的实施方式中，所述第一反应器1、所述第二反应器3与所述第三反应器4在排气的流动方向上依次排列。并且，在功能上，所述第一反应器1为氧化催化器(DOC)、所述第二反应器3为选择性氧化催化模块(SCR)、所述第三反应器4为氨泄漏催化器模块(ASC)。所属技术领域的技术人员可以理解，上述第一、第二、第三反应器1、3、4可以根据实际需要设计为其他类型的催化器或者组合，在此不再赘述。
请参图3至图5所示，所述混合结构2包括壳体21、安装于所述壳体21内的若干隔板22、位于所述壳体21内的混合器23以及混合管24。在本发明图示的实施方式中，所述壳体21呈圆柱体状，其包括与所述第一反应器1连通的排气入口210。所述壳体21还包括位于一侧的端板211。所述若干隔板22包括第一隔板221以及第二隔板222。请参图3所示，所述壳体21包括位于所述第一隔板221上游的第一腔体251、位于所述第一隔板221与所述第二隔板222之间的第二腔体252、以及位于所述第二隔板222下游的第三腔体253。所述混合器23位于所述第一腔体251内且架设固定在所述端板211与所述第一隔板221之间。所述混合管24位于所述第二腔体252内且架设固定在所述第一隔板221与所述第二隔板222之间。所述第二反应器3位于所述第三腔体253的下游。为了便于检视所述混合结构2的内部，所述壳体21还包括对应于所述第一腔体251的第一检视窗261以及对应于所述第二腔体252的第二检视窗262。
请参图3至图5所示，在本发明图示的实施方式中，所述混合器23与所述混合管24均为两个。所述壳体21的排气入口210偏离所述壳体21的轴线，在图3所示的实施方式中，所述排气入口210偏向上部。如此设置，便可以在端板211的下部流出足够的空间用以安装喷嘴26。在本发明的一种实施方式中，所述喷嘴26为两个(图3中只示意性的显示了一个)，所述喷嘴26的数量与所述混合器23的数量相同。
请参图6及图7所示，在本发明图示的实施方式中，所述混合器23呈中空的圆柱体状，其圆周上设有若干向外的翻边231以及对应这些翻边231的若干开口232。所述翻边231倾斜布置以当排气从所述开口232进入所述混合器23时能够形成旋流(参图7中的箭头所示)。所述混合器23设有位于内部的混合腔233，所述混合腔233与所述开口232连通。在工作时，安装在端板211上的喷嘴26沿轴向向所述混合腔233中喷射雾化的尿素溶液。旋流的排气在进入混合腔233之后能够与尿素喷雾液滴更充分地混合，提高混合均匀性，加快尿素液滴的蒸发，形成均匀的氨分布，从而提高NOx的转化效率，降低尿素结晶的风险。
请参图3所示，所述混合器23同样偏离所述壳体21的轴线。在本发明图示的实施方式中，所述混合器23偏向所述第一腔体251的下部，以在所述第一腔体251的上部形成较大的混合空间，增加混合距离。也就是说，所述混合器23与所述排气入口210在轴向上相互错开。
在本发明的一种实施方式中，所述混合器23的两端分别焊接在所述端板211与所述第一隔板221上。所述第一隔板221在对应所述混合器23的位置设有穿孔2211，而所述第一隔板221在所述混合器23的外围没有设置穿孔。如此设置，进入所述混合腔233中的排气与尿素喷雾液滴混合之后穿过所述第一隔板221的穿孔2211进入所述混合管24中。
所述混合管24与所述混合器23在所述轴向上相互对齐且相互连通。请参图8至图10所示，在本发明的一种实施方式中，所述混合管24呈中空结构，所述混合管24的端面呈螺旋状，所述混合管24的一端形成有气流进口240，所述混合管24的另一端被堵上。所述混合管24的外壁上设有沿轴向延伸的气流出口241以形成排气旋流(参图10中的宽箭头所示)。在本发明图示的实施方式中，呈螺旋状的所述端面是由曲率半径依次增大的多个圆弧连接而成。所述混合管24环绕若干圈。所述气流出口241仅有一个，以便于形成旋流。
请参图11及图12所示，在本发明的另一种实施方式中，所述混合管24包括相互配合的第一半圆管242以及第二半圆管243。所述第一半圆管242的半径R1与所述第二半圆管243的半径R2不同。所述第一半圆管242与所述第二半圆管243的一侧连接在一起，所述第一半圆管242与所述第二半圆管243的另一侧在径向上相互错开以形成所述气流出口241。通过设置相互配合的第一半圆管242以及第二半圆管243，本发明混合管24的结构比较简单，易于制造和装配。
在本发明的一种实施方式中，所述混合管24的两端分别焊接在所述第一隔板221与所述第二隔板222上。所述第二隔板222在所述混合管24的外围设有若干穿孔2221，且这些穿孔2221与所述第三腔体253连通；所述第二隔板222将所述混合管24的另一端(在图3中为右端)密封住，使得进入所述混合管24的排气只能从所述气流出口241离开。
请参图10及图12所示，工作时，排气从所述气流进口240进入所述混合管24，然后从所述气流出口241形成漩涡流离开所述混合管24。如此设置，增加了气流在有限空间内的行程，以增加尿素液滴蒸发的距离，提高了蒸发率，提高了混合的均匀性，降低了尿素结晶的风险。
另外，以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (10)

  1. 一种混合管，用于发动机排气处理装置中，其特征在于：所述混合管呈中空结构，所述混合管的一端形成有气流进口，所述混合管的另一端被堵上；所述混合管的端面呈螺旋状，所述混合管的外壁上设有沿轴向延伸的气流出口以形成排气旋流。
  2. 如权利要求1所述的混合管，其特征在于：呈螺旋状的所述端面是由曲率半径依次增大的多个圆弧连接而成。
  3. 如权利要求1所述的混合管，其特征在于：所述混合管包括相互配合的第一半圆管以及第二半圆管，所述第一半圆管与所述第二半圆管的半径不同，所述第一半圆管与所述第二半圆管的一侧连接在一起，所述第一半圆管与所述第二半圆管的另一侧在径向上相互错开以形成所述气流出口。
  4. 如权利要求1所述的混合管，其特征在于：所述气流出口仅有一个。
  5. 如权利要求1所述的混合管，其特征在于：所述混合管至少环绕一圈。
  6. 一种排气处理装置，其包括壳体以安装于所述壳体内的若干隔板，所述若干隔板包括第一隔板以及第二隔板，所述壳体包括位于所述第一隔板上游的第一腔体、位于所述第一隔板与所述第二隔板之间的第二腔体、以及位于所述第二隔板下游的第三腔体，其中所述排气处理装置还包括位于所述第一腔体内的混合器、位于所述第二腔体内的混合管以及位于所述第三腔体下游的选择性催化还原模块，其特征在于：所述混合器与所述混合管相连通，所述混合管为权利要求1至5项中任意一项所述的混合管。
  7. 如权利要求6所述的排气处理装置，其特征在于：所述混合器呈中空的圆柱体状，其圆周上设有若干向外的翻边以及对应这些翻边的若干开口，所述翻边倾斜布置以当排气从所述开口进入所述混合器时能够形成旋流。
  8. 如权利要求7所述的排气处理装置，其特征在于：所述混合器设有位于内部的混合腔，所述混合腔与所述开口连通；所述排气处理装置还包括安装在所述壳体上且用以沿轴向向所述混合腔中喷射尿素溶液的喷嘴。
  9. 如权利要求6所述的排气处理装置，其特征在于：所述第一隔板在所述混合器的外围没有设置穿孔；所述第二隔板在所述混合管的外围设有若干穿孔，且这些穿孔与所述第三腔体连通；所述第二隔板将所述混合管的另一端密封住，使得进入所述混合管的排气只能从所述气流出口离开。
  10. 如权利要求6所述的排气处理装置，其特征在于：所述壳体在其端部设有排气入口，所述混合器与所述排气入口在所述轴向上相互错开，所述混合器与所述混合管在所述轴向上相互对齐。
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