CN106948913B - A kind of exhaust gas processing device and exhaust pipe being convenient to clean urea crystals object - Google Patents

A kind of exhaust gas processing device and exhaust pipe being convenient to clean urea crystals object Download PDF

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Publication number
CN106948913B
CN106948913B CN201710186827.XA CN201710186827A CN106948913B CN 106948913 B CN106948913 B CN 106948913B CN 201710186827 A CN201710186827 A CN 201710186827A CN 106948913 B CN106948913 B CN 106948913B
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China
Prior art keywords
screw thread
inner tube
pipe assembly
exhaust gas
gas processing
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CN201710186827.XA
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Chinese (zh)
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CN106948913A (en
Inventor
赵文仲
李龙超
穆立侠
张雪林
刘芯娟
滕建耐
许涛
候亦波
周涛
宁科亮
常耀红
业德明
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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Priority to CN201710186827.XA priority Critical patent/CN106948913B/en
Publication of CN106948913A publication Critical patent/CN106948913A/en
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Publication of CN106948913B publication Critical patent/CN106948913B/en
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Classifications

    • 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
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • 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
    • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the 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
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing

Abstract

The invention discloses a kind of exhaust gas processing devices and exhaust pipe for being convenient to clean urea crystals object, wherein including mixing pipe assembly and two sealing pipe assemblies；Two sealing pipe assemblies are separately mounted to the both ends of mixing pipe assembly；It mixes pipe assembly and is equipped with urea nozzle mounting hole；Sealing pipe assembly includes the first screw thread outer tube, screw thread inner tube and the second screw thread outer tube, there is external thread structure on the periphery at the both ends of screw thread inner tube, the first end of screw thread inner tube has opening, and the second end closing of screw thread inner tube, the periphery of the second end of screw thread inner tube is equipped with multiple through-holes；The first end of first screw thread outer tube is threadedly coupled with the first end of screw thread inner tube, the first end of second screw thread outer tube is threadedly coupled with the second end of screw thread inner tube, the internal diameter of the first end of second screw thread outer tube is less than the internal diameter of second end, and the second end of the second screw thread outer tube is equipped with baffle ring；The bottom for mixing pipe assembly is equipped with dewatering outlet, is detachably equipped with drain plug at dewatering outlet.Urea crystals object can be quickly cleaned.

Description

A kind of exhaust gas processing device and exhaust pipe being convenient to clean urea crystals object
Technical field
The present invention relates to motor vehicle emission technical field more particularly to a kind of vent gas treatment dresses for being convenient to clean urea crystals object It sets and exhaust pipe.
Background technique
SCR technology route is one of the mainstream technology route that heavy-duty diesel vehicle realizes IV or more discharge standard of state.Its principle It is that urea is sprayed into exhaust pipe, pyrolysis occurs for urea and hydrolysis generates NH3, NH3With the NO in exhaustXIt is anti-that redox occurs It answers, generates N2And H2O, so that reaching reduces NOXThe purpose of discharge.The most common failure mode of SCR technology route is urea knot It is brilliant.Its principle is that urea generates HNCO (isocyanic acid) in pyrolysis, and HNCO may occur side reaction and generate cyanuric acid- (HNCO)3, and cyanuric acid-(HNCO)3It is exactly the main component of urea crystals object.After urea crystals, crystal can be carried out rapidly Accumulation blocks the flow area of exhaust pipe, causes the OBD (emission monitoring diagnostic system) of engine to alarm, very when serious It is unsmooth and flame-out because being vented to engine occurs.
To solve the problems, such as that urea crystals, currently existing scheme mainly optimize urea nozzle design, exhaust pipe design and urine Plain mixer design avoids urea from being rebuffed as far as possible so that urea mixing is more uniform；Optimize urea and spray calibration strategy, to the greatest extent Urea injection may be improved plays spray temperature, avoids overspray.Nonetheless, urea crystals are still unlikely to prevent completely, In vehicle sections operating condition, urea still can be crystallized.
In the prior art, NO is reduced by SCR technologyxMain two kinds of the exhaust gas processing device of discharge, the first structure, such as Shown in Fig. 1 to Fig. 3, Fig. 1 is the first exhaust gas processing device structural schematic diagram disclosed in the prior art, and Fig. 2 is that mixing tube is total At structural schematic diagram, Fig. 3 be mixer structural schematic diagram, including the first connecting tube 1 ', urea nozzle 2 ', mixing pipe assembly 3 ', second connecting tube 4 ', SCR catalyst 5 ' and third connecting tube 6 ', the first connecting tube 1 ', mixing pipe assembly 3 ', the second connection Pipe 4 ', SCR catalyst 5 ' and third connecting tube 6 ' are sequentially communicated and junction is welding, the outlet of urea nozzle 2 ' and mixing tube Assembly 3 ' is connected to；Mixing pipe assembly 3 ' includes mixing tube 301 ' and mixer 302 ', and mixer 302 ' is fixed on mixing tube 301 ' Side.Urea is sprayed into from urea nozzle 2 ', is adequately mixed at mixer 32 with exhaust, is urged evenly into SCR Change device to be chemically reacted.Under individual operating conditions, urea can the region between mixer 302 ' and urea nozzle 2 ' crystallize. Once occurring, crystal can be accumulated rapidly for crystallization, or even the flow area of blocking exhaust pipe.Due to the delivery temperature at crystal 350 DEG C are extremely difficult to, and to maintain longer time, crystal can not be made to decompose using high temperature；2) due to mixing pipe assembly It is welding that 3 ' front and backs, which connect the 1 ', second connecting tube 4 ' with first, and the method for not also being available mechanical percussion removes crystal.Condition And mechanical tap can damage mixer 302 '.It can only will be replaced from the first connection 1 ' to the second connecting tube 4 ' is whole, valence Lattice are expensive.
Second of structure in the prior art, as shown in figure 4, Fig. 4 is second of vent gas treatment disclosed in the prior art Apparatus structure schematic diagram, the difference of such structure and the first structure are only that between the second connecting tube 4 ' and SCR catalyst 5 ' Connection be flanged joint.Be compared with the advantages of the first structure, when urea crystals occur, can will from the second connecting tube 4 ' to Part between first connecting tube 1 ' is removed from vehicle to be replaced, without replacement SCR catalyst 5 ' and third connecting tube 6 ', but And certain replacement cost can be generated, or part will be removed and remove crystallization using method physically or chemically, operation is extremely It is inconvenient.
How quickly and easily urea crystals object to be cleared up, is this field one of major issue urgently to be resolved.
Summary of the invention
The object of the present invention is to provide a kind of exhaust gas processing devices and exhaust pipe for being convenient to clean urea crystals object, are mixing The both ends of pipe assembly form memory space and reach by injecting hot water into the memory space and be convenient to clean urea crystals object Purpose.
The invention proposes a kind of exhaust gas processing devices for being convenient to clean urea crystals object, wherein including mixing pipe assembly With two sealing pipe assemblies；
The two sealing pipe assemblies are separately mounted to the both ends of the mixing pipe assembly；The mixing pipe assembly is equipped with urine Plain nozzle mounting hole；
The sealing pipe assembly includes the first screw thread outer tube, screw thread inner tube and the second screw thread outer tube, the screw thread inner tube There is external thread structure, the first end of the screw thread inner tube has opening, the second end of the screw thread inner tube on the periphery at both ends The periphery of closing, the second end of the screw thread inner tube is equipped with multiple through-holes；
The first end of the first screw thread outer tube is threadedly coupled with the first end of the screw thread inner tube, outside second screw thread The first end of pipe is threadedly coupled with the second end of the screw thread inner tube, and the internal diameter of the first end of the second screw thread outer tube is less than The second end of the internal diameter at two ends, the second screw thread outer tube is equipped with baffle ring；The end face of the second end of the screw thread inner tube can be supported It leans against on the baffle ring, and the hole on baffle ring is closed；
The bottom of the mixing pipe assembly is equipped with dewatering outlet, is detachably equipped with drain plug at the dewatering outlet.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein preferably, the screw thread inner tube Periphery be equipped with boss, and the boss is located at the middle part of the screw thread inner tube.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein preferably, of the boss Number is 4, and is distributed uniformly and circumferentially.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein further include gasket preferably Piece, the gasket seal are fixed in the second end of the screw thread inner tube, and have ripple struction on the gasket seal.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein preferably, the mixing tube is total At both ends be connected to respectively with the second ends of the second screw thread outer tube on two sealing pipe assemblies.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein preferably, the screw thread inner tube Second end periphery on multiple through-holes be uniformly distributed.
It is convenient to clean the exhaust gas processing device of urea crystals object as described above, wherein preferably, the mixing tube is total It is welding at the connection type between both ends and sealing pipe assembly.
The invention also provides a kind of exhaust pipes, wherein including exhaust gas processing device as described in any one of the above embodiments.
The present invention provides a kind of exhaust gas processing devices and exhaust pipe for being convenient to clean urea crystals object, by mixing tube The both ends installation sealing pipe assembly of assembly, by the screw thread inner tube on rotary seal pipe assembly, so that sealing pipe assembly is first It is switched under working condition and the second working condition, when two sealing pipe assemblies are under the first working condition, exhaust pipe is just Often work；When two sealing pipe assemblies are under the second working condition, can be closed in the two sides of mixing pipe assembly, so that mixed It closes pipe assembly and forms cavity.In this way, hot water is injected into the cavity by urea nozzle mounting hole, so as to quickly clean urine Plain crystal.
Detailed description of the invention
Fig. 1 is the exhaust gas processing device structural schematic diagram of the first structure disclosed in the prior art；
Fig. 2 is the structural schematic diagram of mixing tube assembly disclosed in the prior art；
Fig. 3 is the structural schematic diagram of mixer disclosed in the prior art；
Fig. 4 is the exhaust gas processing device structural schematic diagram of second of structure disclosed in the prior art；
Fig. 5 is the mixing pipe assembly and the mounting structure schematic diagram for sealing pipe assembly that the specific embodiment of the invention proposes；
Fig. 6 is the structural schematic diagram for the mixing pipe assembly that the specific embodiment of the invention proposes；
Fig. 7 is the cross-sectional view for the mixing pipe assembly that the specific embodiment of the invention proposes；
Fig. 8 is the structural schematic diagram under sealing the first working condition of pipe assembly that the specific embodiment of the invention proposes；
Fig. 9 is the sectional view along A-A in Fig. 8；
Figure 10 is the structural schematic diagram under sealing the second working condition of pipe assembly that the specific embodiment of the invention proposes；
Figure 11 is the B-B direction cross-sectional view in Figure 10；
Figure 12 is the structural schematic diagram for the screw thread inner tube that the specific embodiment of the invention proposes；
Figure 13 is C-C in Figure 12 to cross-sectional view；
Figure 14 is the side view that the specific embodiment of the invention proposes sealing pipe assembly；
Figure 15 is the partial sectional view for the screw thread inner tube that the specific embodiment of the invention proposes；
Figure 16 is the structural schematic diagram under the first working condition of exhaust gas processing device that the specific embodiment of the invention proposes；
Figure 17 is the structural schematic diagram under the second working condition of exhaust gas processing device that the specific embodiment of the invention proposes.
Description of symbols:
1 '-the first connecting tube, 2 '-urea nozzles, 3 '-mixing pipe assemblies, 4 '-the second connecting tubes, 5 '-SCR catalysts, 6 '-third connecting tubes；
301 '-mixing tubes, 302 '-mixers, 303 '-urea nozzle mounting holes；
1- seals pipe assembly, 2- gasket seal, 3- drain plug；
101- the first screw thread outer tube, 102- screw thread inner tube, 103- the second screw thread outer tube, 104- baffle ring, 105- boss, 106- Through-hole.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Fig. 5 is the mixing pipe assembly and the mounting structure schematic diagram for sealing pipe assembly that the specific embodiment of the invention proposes； Fig. 6 is the structural schematic diagram for the mixing pipe assembly that the specific embodiment of the invention proposes；Fig. 7 mentions for the specific embodiment of the invention The cross-sectional view of mixing pipe assembly out；Fig. 8 is under the first working condition of sealing pipe assembly that the specific embodiment of the invention proposes Structural schematic diagram；Fig. 9 is the sectional view along A-A in Fig. 8；Figure 10 is the sealing pipe assembly that the specific embodiment of the invention proposes Structural schematic diagram under second working condition；Figure 11 is the B-B direction cross-sectional view in Figure 10；Figure 12 is the specific embodiment of the invention The structural schematic diagram of the screw thread inner tube of proposition；Figure 13 is C-C in Figure 12 to cross-sectional view；Figure 14 is the specific embodiment of the invention It is proposed the side view of sealing pipe assembly；Figure 15 is the partial sectional view for the screw thread inner tube that the specific embodiment of the invention proposes；Figure Structural schematic diagram under 16 the first working conditions of exhaust gas processing device proposed for the specific embodiment of the invention；Figure 17 is this hair Structural schematic diagram under the second working condition of exhaust gas processing device that bright specific embodiment proposes.
Figure 17 is arrived referring to figure 5., and the specific embodiment of the invention proposes a kind of tail gas for being convenient to clean urea crystals object Processing unit, wherein including mixing pipe assembly 3 ', two sealing pipe assemblies 1 and gasket seal 2；
The two sealing pipe assemblies 1 are separately mounted to the both ends of the mixing pipe assembly 3 '；On the mixing pipe assembly 3 ' Equipped with urea nozzle mounting hole 303 '；
The sealing pipe assembly 1 includes the first screw thread outer tube 101, screw thread inner tube 102 and the second screw thread outer tube 103, described External thread structure is equipped on the periphery at the both ends of screw thread inner tube 102, the first end of the screw thread inner tube 102 has opening, institute The second end closing of screw thread inner tube 102 is stated, the periphery of the second end of the screw thread inner tube 102 is equipped with multiple through-holes 106；
The first end of the first screw thread outer tube 101 is threadedly coupled with the first end of the screw thread inner tube 102, and described second The first end of screw thread outer tube 103 is threadedly coupled with the second end of the screw thread inner tube 102, and the of the second screw thread outer tube 103 The internal diameter of one end is less than the internal diameter of the second end of the second screw thread outer tube 103；It so, it is possible to guarantee outside second screw thread The periphery of the first end of pipe 103 and the screw thread inner tube 102 is tightly connected, so that the second end of the second screw thread outer tube 103 Between the screw thread inner tube 102 have certain gap, guarantee the screw thread inner tube 102 can by through-hole 106 with it is described The connection of second screw thread outer tube 103；The second end of the second screw thread outer tube 103 is equipped with baffle ring 104；The screw thread inner tube 102 The end face of second end can be resisted against on the baffle ring 104, and the hole on baffle ring 104 is closed；In this way, working as the screw thread inner tube When the end face of 102 second end is not resisted against on the baffle ring 104, the screw thread inner tube 102 and the hole on the baffle ring 104 Connection.
The bottom of the mixing pipe assembly 3 ' is equipped with dewatering outlet, is detachably equipped with drain plug 3 at the dewatering outlet.
When specifically used, by mix 3 ' both ends of pipe assembly two sealing pipe assemblies 1 respectively with the first connecting tube 1 ', second Connecting tube 4 ' is connected to；Second connecting tube 4 ', SCR catalyst 5 ' and third connecting tube 6 ' are sequentially connected with；Sealing pipe assembly 1 has two A working condition under the first working condition, has a certain distance, screw thread between baffle ring 104 and the second end of screw thread inner tube 102 Inner tube 102 is connected to by through-hole 106 with the hole on baffle ring 104；Under second working condition, the second end of screw thread inner tube 102 against On baffle ring 104, and the second end of screw thread inner tube 102 shuts the hole on baffle ring 104, the hole on through-hole 106 and baffle ring 104 without Method connection.When two sealing pipe assemblies 1 are in the first working condition, the exhaust gas processing device is in the first working condition Under, tail gas can sequentially pass through the first connecting tube 1 ', sealing pipe assembly 1, mixing pipe assembly 3 ', sealing pipe assembly 1, second and connect Pipe 4 ', SCR catalyst 5 ' and third connecting tube 6 '；When two sealing pipe assemblies 1 are in the second working condition, the tail gas Processing unit is under the second working condition, the two sides for sealing pipe assembly 1 can be formed sealing space.When needing to mixer When crystal on 302 ' are handled, two screw thread inner tubes 102 are rotated, two sealing pipe assemblies 1 is made to be in the second working condition, The urea nozzle 2 ' being mounted on urea nozzle mounting hole 303 ' is removed, and injects hot water or hot alcohol, due to crystal melamine Acid is soluble in the feature of hot water or hot alcohol, can be allowed to quickly dissolve；Then drain plug 3 is opened, flows out solution by dewatering outlet. It so, it is possible to achieve the purpose that quickly to handle crystal.
The periphery of the screw thread inner tube 102 is equipped with boss 105 as a preferred method, and the boss 105 is located at The middle part of the screw thread inner tube 102.Further, the number of the boss 105 is 4, and is distributed uniformly and circumferentially.Such as This can be allowed to convenient for operating to screw thread inner tube 102 in the first working condition and the second work by the way that boss 105 is arranged Switch between state.
The gasket seal 2 is fixed in the second end of the screw thread inner tube 102 as a preferred method, and described There is ripple struction on gasket seal 2.It so, it is possible to guarantee that in a second operative state, sealing pipe assembly 1 has good close Feng Xing.When it is implemented, the both ends of the mixing pipe assembly 3 ' are respectively and outside the second screw thread on two sealing pipe assemblies 1 The second end of pipe 103 is connected to.In this way, it is smaller to be formed by space when two sealing pipe assemblies 1 are in the second working condition, A small amount of hot water, which is added, can complete cleaning for crystal.
Multiple through-holes 106 on the periphery of the second end of the screw thread inner tube 102 uniformly divide as a preferred method, Cloth.In this way, by the way that multiple through-holes 106 are arranged certain noise reduction can be played the role of, meanwhile, it is capable to make urea in tail gas Mixing it is more uniform.Mixing 3 ' the both ends of pipe assembly and the connection type sealed between pipe assembly 1 are welding.
The specific embodiment of the invention also proposed a kind of exhaust pipe, wherein be mentioned including the specific embodiment of the invention The exhaust gas processing device of confession.
It is upper that structure, feature and effect of the invention are described in detail according to embodiment shown in schema, it is described above Only presently preferred embodiments of the present invention, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to conception of the invention Made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings, It should be within the scope of the present invention.

Claims (8)

1. a kind of exhaust gas processing device for being convenient to clean urea crystals object, which is characterized in that close including mixing pipe assembly and two Tube sealing assembly；
The two sealing pipe assemblies are separately mounted to the both ends of the mixing pipe assembly；The mixing pipe assembly is sprayed equipped with urea Mouth mounting hole；
The sealing pipe assembly includes the first screw thread outer tube, screw thread inner tube and the second screw thread outer tube, the both ends of the screw thread inner tube Periphery on be equipped with external thread structure, the first end of the screw thread inner tube has opening, the second end seal of the screw thread inner tube It closes, the periphery of the second end of the screw thread inner tube is equipped with multiple through-holes；
The first end of the first screw thread outer tube is threadedly coupled with the first end of the screw thread inner tube, the second screw thread outer tube First end is threadedly coupled with the second end of the screw thread inner tube, and the internal diameter of the first end of the second screw thread outer tube is less than second end Internal diameter, the second end of the second screw thread outer tube is equipped with baffle ring；The end face of the second end of the screw thread inner tube can be resisted against On the baffle ring, and the hole on baffle ring is closed；
The bottom of the mixing pipe assembly is equipped with dewatering outlet, is detachably equipped with drain plug at the dewatering outlet.
2. the exhaust gas processing device according to claim 1 for being convenient to clean urea crystals object, which is characterized in that the screw thread The periphery of inner tube is equipped with boss, and the boss is located at the middle part of the screw thread inner tube.
3. the exhaust gas processing device according to claim 2 for being convenient to clean urea crystals object, which is characterized in that the boss Number be 4, and be distributed uniformly and circumferentially.
4. the exhaust gas processing device according to claim 1 for being convenient to clean urea crystals object, which is characterized in that further include close Gasket, the gasket seal are fixed in the second end of the screw thread inner tube, and have ripple struction on the gasket seal.
5. the exhaust gas processing device according to claim 1 for being convenient to clean urea crystals object, which is characterized in that the mixing The both ends of pipe assembly are connected to the second end of the second screw thread outer tube on two sealing pipe assemblies respectively.
6. the exhaust gas processing device according to claim 1 for being convenient to clean urea crystals object, which is characterized in that the screw thread Multiple through-holes on the periphery of the second end of inner tube are uniformly distributed.
7. being convenient to clean the exhaust gas processing device of urea crystals object described in -6 any one according to claim 1, feature exists In the mixing pipe assembly both ends and the connection type sealed between pipe assembly are welding.
8. a kind of exhaust pipe, which is characterized in that including such as described in any item exhaust gas processing devices of claim 1-7.
CN201710186827.XA 2017-03-27 2017-03-27 A kind of exhaust gas processing device and exhaust pipe being convenient to clean urea crystals object Active CN106948913B (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110439656B (en) * 2019-08-20 2020-06-05 安徽江淮汽车集团股份有限公司 Urea crystal dissolving and removing device
CN114060184B (en) * 2020-07-31 2023-04-07 比亚迪股份有限公司 Water-gas mixing device and engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006108419A1 (en) * 2005-04-13 2006-10-19 Grundfos Nonox A/S A mixing device for mixing urea and air
CN202467994U (en) * 2012-02-08 2012-10-03 潍柴动力股份有限公司 Mixed section pipeline of SCR (Selective Catalytic Reduction) exhaust pipe
CN104121081A (en) * 2014-07-02 2014-10-29 潍柴动力股份有限公司 Air inlet pipe of SCR tail gas processing system and SCR tail gas processing system
CN105041433A (en) * 2015-09-01 2015-11-11 安徽江淮汽车股份有限公司 Automotive SCR system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006108419A1 (en) * 2005-04-13 2006-10-19 Grundfos Nonox A/S A mixing device for mixing urea and air
CN202467994U (en) * 2012-02-08 2012-10-03 潍柴动力股份有限公司 Mixed section pipeline of SCR (Selective Catalytic Reduction) exhaust pipe
CN104121081A (en) * 2014-07-02 2014-10-29 潍柴动力股份有限公司 Air inlet pipe of SCR tail gas processing system and SCR tail gas processing system
CN105041433A (en) * 2015-09-01 2015-11-11 安徽江淮汽车股份有限公司 Automotive SCR system

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