WO2016134647A1 - 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
WO2016134647A1
WO2016134647A1 PCT/CN2016/074311 CN2016074311W WO2016134647A1 WO 2016134647 A1 WO2016134647 A1 WO 2016134647A1 CN 2016074311 W CN2016074311 W CN 2016074311W WO 2016134647 A1 WO2016134647 A1 WO 2016134647A1
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WO
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Prior art keywords
tube
mixing
outlet
semicircular
mixing tube
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PCT/CN2016/074311
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English (en)
French (fr)
Inventor
司马翔
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天纳克（苏州）排放***有限公司
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Application filed by 天纳克（苏州）排放***有限公司 filed Critical 天纳克（苏州）排放***有限公司
Publication of WO2016134647A1 publication Critical patent/WO2016134647A1/zh

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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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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

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 comprising a first semicircular tube and a second semicircular tube that cooperate with each other, the first semicircular tube and the The second semicircular tubes are mutually offset in the radial direction to form a first outlet and a second outlet on the circumference;
  • the first semicircular tube includes a first end surface, a second end surface opposite to the first end surface, and the first end, a first space between the second end faces;
  • the second semicircular tube includes a third end surface, a fourth end surface opposite to the third end surface, and a second space between the third and fourth end surfaces;
  • the first space communicates with the second space to form a mixing space of the mixing tube, the mixing space is in communication with the first outlet and the second outlet;
  • the first end surface and the third end An end surface is located at one side of the mixing tube to form an air inlet, the second end surface and the fourth end surface are located on the other side of the mixing tube, and
  • the first semicircular tube includes a first end and a second end respectively located at two sides; the second semicircular tube includes a third end and a fourth end respectively located at two sides; The first end is adjacent to the third end, the first outlet is located between the first end and the third end; the second end is adjacent to the fourth end, and the second outlet is located at the Between the second end and the fourth end.
  • the second end is located inside the fourth end, and the A second end portion extends into the second space; the third end is located inside the first end, and the third end portion extends into the first space.
  • the first semicircular pipe is located at an upper portion of the mixing pipe, and the second semicircular pipe is located at a lower portion of the mixing pipe.
  • the radius of the first semicircular pipe is the same as the radius of the second semicircular pipe.
  • the first semicircular tube and the second semicircular tube are cut from the same cylindrical tube.
  • 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 baffle, a second cavity between the first baffle and the second baffle, and a third cavity located downstream of the second baffle, wherein the exhaust treatment device further includes a mixer located in the first cavity, a mixing tube located in the second cavity, and a selective catalytic reduction module located downstream of the third cavity, the mixer The mixing tube is in communication with the 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 a mixing chamber located inside, the mixing chamber is in communication with the opening, and the exhaust treatment device further comprises a housing mounted on the housing a nozzle for injecting a urea solution in the mixing chamber in the axial direction.
  • 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 cavity is in communication;
  • the second baffle seals the second end face and the fourth end face such that exhaust gas entering the mixing pipe can only be from the first outlet and the second outlet go away.
  • the casing is provided with an exhaust gas inlet at an end thereof, the mixer and the exhaust gas inlet are axially offset from each other, and the mixer and the mixing pipe are The axes are aligned with each other.
  • the mixing tube of the present invention comprises a first semi-circular tube and a second semi-circular tube which are matched with each other, and has a simple structure; the first semi-circular tube and the second semi-circular tube are mutually offset in the radial direction to form a circle on the circumference.
  • the evaporation rate is increased, the uniformity of mixing is improved, and the risk of urea crystallization is lowered.
  • 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 an exploded perspective view of another angle of Figure 5.
  • Figure 7 is a perspective view of the mixer of Figure 6.
  • Fig. 8 is a front view of Fig. 7, and the direction of rotation of the air flow is indicated by arrows.
  • Figure 9 is a perspective view of the mixing tube of Figure 6.
  • Fig. 10 is a front view of Fig. 9.
  • 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, and a plurality of outward flanges 231 are disposed on the circumference thereof and corresponding to the flanges 231 .
  • the flange 231 is obliquely arranged to form a swirl as the exhaust enters the mixer from the opening 232 (shown by the arrows in Figure 8).
  • 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 includes a first semicircular tube 241 and a second semicircular tube 242 that cooperate with each other.
  • the first semicircular tube 241 and the second semicircular tube 242 are mutually mutually radial. Staggered to form a first outlet 243 and a second outlet 244 on the circumference.
  • the first semicircular tube 241 includes a first end surface 2411, a second end surface 2412 opposite to the first end surface 2411, and a first space 2413 between the first and second end surfaces 2411, 2412.
  • the second semicircular tube 242 includes a third end surface 2421 , a fourth end surface 2422 opposite to the third end surface 2421 , and a second space 2423 between the third and fourth end surfaces 2421 , 2422 .
  • the first space 2413 communicates with the second space 2423 to form a mixing space 240 of the mixing tube 24.
  • the mixing space 240 is in communication with both the first outlet 243 and the second outlet 244.
  • the first end surface 2411 and the third end surface 2421 are located on one side of the mixing tube 24 (the front side in the embodiment shown in FIG. 9) to form an air inlet 245.
  • the second end surface 2412 and the fourth end surface 2422 are located on the other side of the mixing tube 24 (the rear side in the embodiment shown in FIG. 9), and are used to be blocked by the second partition plate 222.
  • the first outlet 243 is opposite to the opening direction of the second outlet 244 to form a swirling flow (shown by a wide arrow in FIG. 11).
  • the first semicircular tube 241 includes a first end 2414 and a second end 2415 respectively located at two sides; the second semicircular tube 242 includes a third end 2424 respectively located at two sides. And a fourth end 2425.
  • the first end 2414 is adjacent to the third end 2424, the first outlet 243 is located between the first end 2414 and the third end 2424; the second end 2415 is adjacent to the fourth end 2425
  • the second outlet 244 is located between the second end 2415 and the fourth end 2425.
  • the second end 2415 is located inside the fourth end 2425, and the second end 2415 extends partially into The second space 2423 is inside.
  • the third end 2424 is located inside the first end 2414 and the third end 2424 extends partially into the first space 2413.
  • the first semicircular tube 241 is located at an upper portion of the mixing tube 24, and the second semicircular tube 242 is located at a lower portion of the mixing tube 24.
  • the radius R1 of the first semicircular tube 241 is the same as the radius R2 of the second semicircular tube 242.
  • the first semicircular tube 241 and the second semicircular tube 242 are cut from the same cylindrical tube to save cost.
  • both ends of the mixing tube 24 are welded to the first partition 221 and the second partition 222, respectively.
  • the second partition plate 222 is provided with a plurality of through holes 2221 at the periphery of the mixing tube 24, and the through holes 2221 are in communication with the third cavity 253; the second partition plate 222 connects the second end surface 2412 and The fourth end face 2422 is sealed such that exhaust gas entering the mixing tube 24 can only exit the first outlet 243 and the second outlet 244.
  • exhaust gas enters the mixing space 240 from the air inlet 245, and then forms a swirling flow from the first outlet 243 and the second outlet 244 away from the mixing tube 24. .
  • the structure of the mixing tube 24 of the present invention is relatively simple and easy to manufacture and assemble.
  • the first semicircular tube 241 and the second semicircular tube 242 are mutually offset in the radial direction to form a first outlet 243 and a second outlet 244 on the circumference, and the first outlet 243 is opposite to the opening direction of the second outlet 244.
  • the swirl will also rotate after entering the mixing space 240, 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 uniformity of the mixing.
  • the swirling direction formed by the first outlet 243 and the second outlet 244 is the same (that is, two streams of the same swirling flow are formed), and the swirl formed in the mixing space 240 is formed. There is also a strengthening effect.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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），用于发动机排气处理装置（100）中，其包括相互配合的第一半圆管（241）和第二半圆管（242），该第一半圆管与该第二半圆管在径向上相互错开以在圆周上形成第一出口（243）和第二出口（244），该第一出口与该第二出口的开口方向相反以形成旋流。该混合管结构简单，旋流在进入混合空间后还会旋转，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。还公开了一种具有该混合管的排气处理装置。

Description

混合管及其排气处理装置
本申请要求了申请日为2015年2月27日，申请号为201520118477.X，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***(例如选择性催化还原***，SCR***)管路中氨分布的均匀程度对***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，其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在径向上相互错开以圆周上形成第一出口以及第二出口；所述第一半圆管包括第一端面、与所述第一端面相对的第二端面以及位于所述第一、第二端面之间的第一空间；所述第二半圆管包括第三端面、与所述第三端面相对的第四端面以及位于所述第三、第四端面之间的第二空间；所述第一空间与所述第二空间连通以形成所述混合管的混合空间，所述混合空间与所述第一出口以及所述第二出口均连通；所述第一端面与所述第三端面位于所述混合管的一侧以形成进气口，所述第二端面与所述第四端面位于所述混合管的另一侧，并用以被堵上；所述第一出口与所述第二出口的开口方向相反以形成旋流。
作为本发明进一步改进的技术方案，所述第一半圆管包括分别位于两侧的第一末端以及第二末端；所述第二半圆管包括分别位于两侧的第三末端以及第四末端；所述第一末端靠近所述第三末端，所述第一出口位于所述第一末端与所述第三末端之间；所述第二末端靠近所述第四末端，所述第二出口位于所述第二末端与所述第四末端之间。
作为本发明进一步改进的技术方案，所述第二末端位于所述第四末端的内侧，且所述第 二末端部分延伸入所述第二空间内；所述第三末端位于所述第一末端的内侧，且所述第三末端部分延伸入所述第一空间内。
作为本发明进一步改进的技术方案，所述第一半圆管位于所述混合管的上部，所述第二半圆管位于所述混合管的下部。
作为本发明进一步改进的技术方案，所述第一半圆管的半径与所述第二半圆管的半径相同。
作为本发明进一步改进的技术方案，所述第一半圆管与所述第二半圆管是由同一根圆柱管切割而成的。
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，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；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***没有设置穿孔；所述第二隔板在所述混合管的***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第二端面以及所述第四端面密封住，使得进入所述混合管的排气只能从所述第一出口与所述第二出口离开。
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，本发明的混合管包括相互配合的第一半圆管以及第二半圆管，结构简单；所述第一半圆管与第二半圆管在径向上相互错开以圆周上形成第一出口以及第二出口，所述第一出口与所述第二出口的开口方向相反以形成旋流，此旋流在进入混合空间后还会旋转，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另一角度的立体分解图。
图7是图6中混合器的立体图。
图8是图7的主视图，并且用箭头标示出了气流的旋转方向。
图9是图6中混合管的立体图。
图10是图9的主视图。
图11与图10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6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6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6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7及图8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进入所述混合器时能够形成旋流(参图8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***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9至图11所示，所述混合管24包括相互配合的第一半圆管241以及第二半圆管242，所述第一半圆管241与所述第二半圆管242在径向上相互错开以圆周上形成第一出口243以及第二出口244。所述第一半圆管241包括第一端面2411、与所述第一端面2411相对的第二端面2412以及位于所述第一、第二端面2411、2412之间的第一空间2413。所述第二半圆管242包括第三端面2421、与所述第三端面2421相对的第四端面2422以及位于所述第三、第四端面2421、2422之间的第二空间2423。所述第一空间2413与所述第二空间2423连通以形成所述混合管24的混合空间240。所述混合空间240与所述第一出口243以及所述第二出口244均连通。所述第一端面2411与所述第三端面2421位于所述混合管24的一侧(在图9所示的实施方式中为前侧)以形成进气口245。所述第二端面2412与所述第四端面2422位于所述混合管24的另一侧(在图9所示的实施方式中为后侧)，并用以被所述第二隔板222堵上。所述第一出口243与所述第二出口244的开口方向相反以形成旋流(参图11中的宽箭头所示)。
请参图9及图10所示，所述第一半圆管241包括分别位于两侧的第一末端2414以及第二末端2415；所述第二半圆管242包括分别位于两侧的第三末端2424以及第四末端2425。所述第一末端2414靠近所述第三末端2424，所述第一出口243位于所述第一末端2414与所述第三末端2424之间；所述第二末端2415靠近所述第四末端2425，所述第二出口244位于所述第二末端2415与所述第四末端2425之间。
所述第二末端2415位于所述第四末端2425的内侧，且所述第二末端2415部分延伸入 所述第二空间2423内。所述第三末端2424位于所述第一末端2414的内侧，且所述第三末端2424部分延伸入所述第一空间2413内。
在本发明图示的实施方式中，所述第一半圆管241位于所述混合管24的上部，所述第二半圆管242位于所述混合管24的下部。所述第一半圆管241的半径R1与所述第二半圆管242的半径R2相同。优选地，所述第一半圆管241与所述第二半圆管242是由同一根圆柱管切割而成的，以节省成本。
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***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将所述第二端面2412以及所述第四端面2422密封住，使得进入所述混合管24的排气只能从所述第一出口243与所述第二出口244离开。
请参图11所示，工作时，排气从所述进气口245进入所述混合空间240，然后从所述第一出口243与所述第二出口244形成漩涡流离开所述混合管24。
通过设置相互配合的第一半圆管241以及第二半圆管242，本发明混合管24的结构比较简单，易于制造和装配。所述第一半圆管241与第二半圆管242在径向上相互错开以圆周上形成第一出口243以及第二出口244，所述第一出口243与所述第二出口244的开口方向相反用以形成排气旋流，此旋流在进入混合空间240后还会旋转，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。另外，请参图11所示，所述第一出口243与所述第二出口244处形成的旋流方向一致(即形成两股旋向相同的气流)，对混合空间240内形成的旋流也有加强效果。
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在径向上相互错开以圆周上形成第一出口以及第二出口；所述第一半圆管包括第一端面、与所述第一端面相对的第二端面以及位于所述第一、第二端面之间的第一空间；所述第二半圆管包括第三端面、与所述第三端面相对的第四端面以及位于所述第三、第四端面之间的第二空间；所述第一空间与所述第二空间连通以形成所述混合管的混合空间，所述混合空间与所述第一出口以及所述第二出口均连通；所述第一端面与所述第三端面位于所述混合管的一侧以形成进气口，所述第二端面与所述第四端面位于所述混合管的另一侧，并用以被堵上；所述第一出口与所述第二出口的开口方向相反用以形成排气旋流。
  2. 如权利要求1所述的混合管，其特征在于：所述第一半圆管包括分别位于两侧的第一末端以及第二末端；所述第二半圆管包括分别位于两侧的第三末端以及第四末端；所述第一末端靠近所述第三末端，所述第一出口位于所述第一末端与所述第三末端之间；所述第二末端靠近所述第四末端，所述第二出口位于所述第二末端与所述第四末端之间。
  3. 如权利要求2所述的混合管，其特征在于：所述第二末端位于所述第四末端的内侧，且所述第二末端部分延伸入所述第二空间内；所述第三末端位于所述第一末端的内侧，且所述第三末端部分延伸入所述第一空间内。
  4. 如权利要求1所述的混合管，其特征在于：所述第一半圆管位于所述混合管的上部，所述第二半圆管位于所述混合管的下部。
  5. 如权利要求1所述的混合管，其特征在于：所述第一半圆管的半径与所述第二半圆管的半径相同。
  6. 如权利要求1所述的混合管，其特征在于：所述第一半圆管与所述第二半圆管是由同一根圆柱管切割而成的。
  7. 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6项中任意一项所述的混合管。
  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；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7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***没有设置穿孔；所述第二隔板在所述混合管的***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第二端面以及所述第四端面密封住，使得进入所述混合管的排气只能从所述第一出口与所述第二出口离开。
  10. 如权利要求7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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