CN109798168A - A kind of preprocessor structure of detachable integrated urea nozzle - Google Patents
A kind of preprocessor structure of detachable integrated urea nozzle Download PDFInfo
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- CN109798168A CN109798168A CN201811507577.6A CN201811507577A CN109798168A CN 109798168 A CN109798168 A CN 109798168A CN 201811507577 A CN201811507577 A CN 201811507577A CN 109798168 A CN109798168 A CN 109798168A
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- 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
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Abstract
The present invention relates to a kind of preprocessor structure of detachable integrated urea nozzle, there is mixing chamber in the preprocessor shell of the structure；Air inlet unit is fixed on the drive end bearing bracket of preprocessor shell and its opening portion is protruded into preprocessor shell；Mixed cell is mounted on the side of preprocessor shell, and urea nozzle seat welding assembly connect with external urea nozzle and connect by V-type clip assembly with fluid path assembly；Fluid path assembly is connect with urea mixer assembly, and urea mixer assembly is located in mixing chamber；SCR unit is located in preprocessor shell, and front end is connect with mixing chamber, rear end cap of the rear end close to preprocessor shell；Muffling unit is arranged in the periphery of SCR unit；Outlet cell is disposed adjacent to the rear end cap position of preprocessor shell.Integrated level of the present invention is high, and dissembling inspection preprocessor inside and mixer whether can generate urea crystals at any time, and can dismantle the internal urea crystals generated of cleaning at any time.
Description
Technical field
The present invention relates to the preprocessor structures that a kind of square detachably integrates urea nozzle, suitable for meeting state IV, state
V, the diesel oil commercial vehicle of state VI regulation.
Background technique
Diesel engine state IV, state V, state VI emission regulation in exhaust contaminant (mainly particle and nitrogen oxidation are closed
Object NOx) limit value, reduced compared with national Ⅲ emission regulation very much.It is difficult to realize that reduction is above two simultaneously in engine machine
Exhaust contaminant, SCR (selective catalysis reduction) system can be effectively reduced the content of oxynitrides in exhaust contaminant, make to send out
The exhaust contaminant of motivation meets emission regulation demands.
With the extensive application of SCR technology, the aqueous solution of urea as reducing agent needs to spray by urea nozzle in advance
Enter in gas exhaust piping and be sufficiently mixed uniformly with exhaust gas, for redox reaction occurs with NOx on preprocessor carrier.But
The arrangement requirement of urea nozzle is harsher, and there are following technical problems for existing urea nozzle arrangement:
1. urea nozzle is arranged on pipeline, there are urea nozzle and pipeline axis angle, nozzle carrier welding and assembling height, urea
The arrangements requirement such as nozzle and pipeline biasing.The bend pipe and pipeline welding procedure of existing pipeline arrangement are difficult to meet above-mentioned want
It asks；
2. urea nozzle is arranged on pipeline, since urea has corrosivity, it is desirable that all pipelines contacted with urea are all
Stainless steel material, higher cost must be used；
3. aqueous solution of urea is there may be urea crystals, the pipeline urea crystals of existing pipeline arrangement there may be
Leakage, corrosion, largely effect on aesthetics；
4. aqueous solution of urea is there may be urea crystals, the urea crystals of existing pipeline arrangement may in pipeline and
It generates and accumulates inside preprocessor, influence exhaust system backpressure or even blocking pipeline and preprocessor；
5. there may be urea crystals for aqueous solution of urea, urea crystals such as occur, then this part urea then can not conduct
The reducing agent ammonia of SCR reaction participates in selective catalysis reduction reaction, may cause the exceeded failure of vehicle nitrogen oxides, or even limit
Vehicle output torque processed；
6. there may be urea crystals, existing pipeline arrangements to observe in preprocessor at any time for aqueous solution of urea
Whether portion generates crystallization；
7. there may be urea crystals for aqueous solution of urea.Once crystallization is generated, after existing pipeline arrangement can not be cleared up
The crystallization generated inside processor；
8. aqueous solution of urea hydrolysis needs lasting high temperature (140 DEG C), the pipeline inner wall of existing single layer pipeline arrangement
Temperature declines quickly, and systematic heat utilization rate is low, not can guarantee continuous high temperature；
9. the drop of aqueous solution of urea need adequately with air flow contacts, impact, be crushed evaporation rate to guarantee ammonia, it is existing
It not can guarantee drop whether there is or not the arrangement of mixer and being sufficiently mixed for air-flow guarantee that urea mixing uniformity and ammonia evaporate
Rate；
10. the mixing of aqueous solution of urea needs certain reaction time with hydrolysis, existing pipeline arrangement need to arrange compared with
Long pipeline (>=500mm) is unfavorable for saving space to guarantee mixing and hydrolysis time；
11. vehicle urea tank is arranged in after exhaust system, needed between urea nozzle and urea tank urea supply pipeline into
Row connection.The urea nozzle and the distance between urea tank of existing pipeline arrangement are longer, and feeding pipe is also longer, unfavorable
Yu Jiangchong cost declining；
12. there are various (loading, traction, self-unloading, harmful influences etc.) for vehicle, generalization, integrated, mould as far as possible is needed
Block guarantees product diversity.Existing pipeline arrangement is unfavorable for generalization, integrated, modularization.
To solve the above problems, exhaust system is required to reduce urea crystals while guaranteeing urea mixing uniformity
Risk.It requires really to have occurred once crystallizing simultaneously, it is also desirable to have observable that can clear up the structure of crystallization.
Therefore, be badly in need of now it is a kind of can solve the above problem, on preprocessor integrated-type, it is modular, guarantee
It is sealing, with mixer, anti-urea crystals ability is strong, it is high, the detachable dress watch of heat utilization efficiency, simple it is low at
This urea nozzle arrangement, can reduce arrangement difficulty, realize that the uniform of urea mixes and very strong anti-urea crystals energy
Power.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of integrated-type, modular detachably integrated urea nozzles
Preprocessor structure, which can be at any time inside dissembling inspection preprocessor and whether mixer generate urea crystals, and can
The internal urea crystals generated of disassembly cleaning at any time.
In order to solve the above-mentioned technical problem, the preprocessor structure of detachable integrated urea nozzle of the invention, including it is rear
Processor shell, air inlet unit, mixed cell, SCR unit, muffling unit and outlet cell；The preprocessor shell
Interior to have columnar mixing chamber, the rear end of mixing chamber is porous end cap；Air inlet unit is fixed on preprocessor shell
Drive end bearing bracket on, there is partially protruding into preprocessor shell for opening, and its axis for protruding into preprocessor enclosure interior point
Line is parallel with the axis of mixing chamber；Mixed cell is mounted on the side of preprocessor shell, including the welding of urea nozzle seat
Assembly, fluid path assembly, urea mixer assembly；Urea nozzle seat welding assembly is sprayed by bolt and gasket and external urea
Mouth connection, and connect by V-type clip assembly with fluid path assembly；Fluid path assembly is connect with urea mixer assembly, and urea is mixed
Clutch assembly is located in mixing chamber；SCR unit is located in preprocessor shell, and front end is connect with mixing chamber, and rear end is leaned on
The rear end cap of nearly preprocessor shell；Muffling unit is arranged in the periphery of SCR unit；Outlet cell is arranged in preprocessor shell
Rear end cap on the side of body and close to preprocessor shell is arranged.
The mixing chamber includes mixing chamber end cap, mixing chamber enclosure, the porous end cap of mixing chamber, fixed cone；Described
Mixing chamber end cap is fixed on drive end bearing bracket；Mixing chamber enclosure is located in preprocessor shell, and front end connects mixing chamber end cap,
End connects the miner diameter end of the porous end cap of mixing chamber and fixed cone.
The air inlet unit includes inlet flange, air inlet tube, half opening antipriming pipe；Air inlet tube protrudes into air inlet
Weld together in flange by circumferencial direction；Air inlet tube is protruded into preprocessor shell and is welded on half opening antipriming pipe
Together.
The half opening antipriming pipe includes porous section and half opening section.
In the mixed cell, band gap step flange, urea nozzle seat, urea nozzle seat weld pedestal, transition bottom
Seat is successively welded together to form dismountable urea nozzle seat welding assembly；Band boss mouth step flange, fluid path import bottom
Seat, outer mixing tube are successively welded together to form fluid path assembly；The side of preprocessor shell is fixed on boss mouth step flange
On face；Mixing tube and porous end cap form urea mixer assembly in fluid path assembly interior welds；Wherein band gap step flange
Gap matched with the step with boss mouth step flange to be formed it is circumferentially positioned and using gasket and V-type clip assembly it is close
Envelope connection；The aperture of urea mixer assembly and mixing chamber side is welded.
The SCR unit includes carrier and SCR package casing after carrier, SCR before SCR；Carrier and SCR rear bearing before SCR
Body is filled in by carrier liner in SCR package casing and being fixed in SCR package casing formation SCR assembly by tandem；
Carrier side before the SCR of SCR assembly and fixed cone circumference soldering are formed into SCR unit.
The muffling unit includes first partition and the second noise elimination partition；First partition and fixed cone bigger diameter end and SCR
The welding of package casing front end；Second noise elimination partition is welded on the outside medium position of SCR package casing.
The outlet cell includes gas outlet flange and escape pipe；Escape pipe is weldingly fixed on preprocessor shell
On side, gas outlet flange welding is on the outer end face of escape pipe.
The present invention is arranged on preprocessor using urea nozzle seat to be directly integrated and is cooperated with urea mixer assembly
Use, can well solve pipeline, urea nozzle difficult arrangement, urea mixing uniformity be difficult to guarantee, anti-urea crystals ability not
The problems such as sufficient.
The present invention is changed to by traditional nozzle carrier with pipeline welding manner in the junction of urea nozzle seat and preprocessor
Flange gasket connection type guarantees detachable, the observable of urea nozzle seat while guaranteeing sealing.It can dismantle at any time
It checks inside preprocessor and whether mixer generates urea crystals.The internal urea crystals generated of cleaning can be dismantled at any time.This
Invention integrated level is high, simple at low cost.
Most critical technology of the present invention is the detachable urea nozzle holder structure for guaranteeing leakproofness.The structure is concave-convex step
Flange encryption packing adds the sealing structure of V-type clip assembly.It can be very good to guarantee leakproofness, do not generate gas and urea is let out
Leakage, can repeatedly use.The technology ensure that once urea crystals and blocking really occur, can be detachable by opening
The observation of urea nozzle holder structure.The structure can observe completely and clear up urea mixing tube simultaneously after opening, and aperture size guarantees
In 80mm or more, facilitates and simply clear up a small amount of urea crystals with tool.Entire preprocessor is total caused by avoiding because of urea crystals
At failure.
Preprocessor can greatly improve the system integration using integrated urea nozzle scheme, and it is anisotropic to reduce System level gray correlation.
It can be non-stainless steel by former stainless steel pipeline cost declining while substantially reducing pipeline arrangement difficulty.Urea supply pipeline
Deng can also shorten.Completely eliminate influence of the pipeline foozle to urea crystals.Modular assembly is relatively reliable, more
Advantageous generalization.
Increase urea mixer inside preprocessor, adds the structure of mixing chamber to mention significantly using the inside and outside spinning disk of original creation
The gas of high gas circuit supply enters the uniformity of mixing tube.It is mutual that the design of inside and outside mixing tube can greatly improve gas-liquid
Percussion.Allow even into gas adequately impact fluid path penetrating urea, be crushed urea droplets adequately, hydrolyze.
For hydrolytic process in mixing tube, extraneous gas substantially increases mixing tube temperature simultaneously, is advantageous to improve percent hydrolysis.
The harm of urea crystals is huge, and scheme of the crude urine element arrangement of nozzles on pipeline is unfavorable for avoiding urea crystals.Knot
Brilliant major influence factors have temperature, flow velocity, breakup of drop situation, if continuous injection etc..Increase the integrated urea spray of mixer
Its porous mixing tube of mouth scheme is surrounded by high-temperature exhaust air completely, therefore temperature is higher.Interior mixing tube circumferential direction aperture ensure that flow velocity is equal
It is even, no flow dead zone.The urea of uniform gas shock fluid path is conducive to its broken hydrolysis.Such as find that urea nozzle is continuously sprayed
Situation is penetrated, then detachable structure is opened into observation and cleaning.
Detailed description of the invention
Fig. 1 is the preprocessor structural perspective that square of the invention detachably integrates urea nozzle.
Fig. 2 is the preprocessor structure sectional view that square of the invention detachably integrates urea nozzle.
Fig. 3 is the gas circuit fluid path schematic diagram for the preprocessor structure that square of the invention detachably integrates urea nozzle.
Fig. 4 is the cross-sectional view of assembly air inlet unit.
Fig. 5 is half opening antipriming pipe perspective view.
Fig. 6 is partial perspective view of the invention.
Fig. 7 a is the partial sectional view of mixed cell, and Fig. 7 b is the partial enlarged view of Fig. 5.
Fig. 8 is the cross-sectional view of SCR unit.
Fig. 9 is the cross-sectional view of muffling unit.
Figure 10 is the cross-sectional view of outlet cell.
1, preprocessor outer housing；101, drive end bearing bracket；102, outer housing, 103, rear end cap；104, mixing chamber end cap；
105, chamber enclosure is mixed；106, the porous end cap of mixing chamber；107, fixed cone；2, air inlet unit；201, inlet flange；202,
Air inlet tube；203, half opening antipriming pipe；2031, porous section；2032, half opening section；3, mixed cell；303, porous end cap；
304, interior mixing tube；305, outer mixing tube；306, fluid path import pedestal；307, band boss mouth step flange；308, transition bottom
Seat；309, urea nozzle seat welds pedestal；310, urea nozzle seat；311, band gap step flange；312, V-type clip is total
At；4, SCR unit；401, carrier before SCR；402, carrier after SCR；403, SCR package casing；501, first partition；502,
Two noise elimination partitions；6, outlet cell；601, gas outlet flange；602, escape pipe；701, block temperature sensor；702, nitrogen oxygen passes
Sensor seat.
Specific embodiment
Below by specific embodiment and in conjunction with attached drawing, the present invention is described in further detail.
As shown in Figure 1, Figure 2, Figure 3 shows, the preprocessor structure of detachable integrated urea nozzle of the invention is tandem junction
Structure, including preprocessor shell 1, air inlet unit 2, mixed cell 3, SCR unit 4, muffling unit 5 and outlet cell 6；
As shown in Fig. 1,2,4, the preprocessor shell 1 includes drive end bearing bracket 101, the outer housing welded together
102, rear end cap 103；There is columnar mixing chamber in preprocessor shell 1；Mixing chamber includes being welded and fixed together
Mixing chamber end cap 104, mixing chamber enclosure 105, the porous end cap 106 of mixing chamber, fixed cone 107；The mixing chamber end cap
104 front ends for being fixed on mixing chamber enclosure 105 are arranged on drive end bearing bracket 101；Mixing chamber enclosure 105 is located at preprocessor shell 1
Interior, end connects the miner diameter end of the porous end cap 106 of mixing chamber and fixed cone 107.
The air inlet unit 2 includes inlet flange 201, air inlet tube 202, half opening antipriming pipe 203；Air inlet connecting
Pipe 202 protrudes into inlet flange 201 to be welded together by circumferencial direction；Air inlet tube 202 protrudes into drive end bearing bracket 101 and with half
Open porous pipe 203, which welds together, constitutes drive end bearing bracket welding assembly；Half opening antipriming pipe 203 is by porous section 2031 of front
It is constituted with the half opening section 2032 at rear portion；The axis of air inlet tube 202 is parallel with mixing 105 axis of chamber enclosure.
As shown in Fig. 2, Fig. 7 a, Fig. 7 b, the mixed cell 3 include urea nozzle seat welding assembly, fluid path assembly,
Urea mixer assembly；Band gap step flange 311, urea nozzle seat 310, urea nozzle seat weld pedestal 309, transition bottom
Seat 308 is successively welded together to form dismountable urea nozzle seat welding assembly；Band boss mouth step flange 307 is fixed on
On the side of preprocessor shell 1；Band boss mouth step flange 307, fluid path import pedestal 306, outer mixing tube 305 successively weld
It is connected together to form fluid path assembly；Mixing tube 304 and porous end cap 303 form urea mixer in fluid path assembly interior welds
Assembly；Gap wherein with gap step flange 311, which matches to be formed with the step with boss mouth step flange 307, circumferentially to be determined
Position is simultaneously tightly connected using gasket and V-type clip assembly 312；Urea mixer assembly with mix 105 side of chamber enclosure
Aperture welding.
As shown in figure 8, the SCR unit 4 includes carrier 402 and SCR package casing after carrier 401, SCR before SCR
403；Before SCR after carrier 401 and SCR carrier 402 by tandem by carrier liner fill in in SCR package casing 403 simultaneously
It is fixed in SCR package casing 403 and forms SCR assembly；By 401 side of carrier before the SCR of SCR assembly and 107 circumferential weld of fixed cone
It connects.
As shown in figure 9, the muffling unit 5 includes and first partition 501 and the second noise elimination partition 502；First partition
501 weld with 106 bigger diameter end of fixed cone and 403 front end of SCR package casing；It is outer that second noise elimination partition 502 is welded on SCR encapsulation
On the outside of the middle part of shell 403.
As shown in Figure 10, the outlet cell 6 includes gas outlet flange 601 and escape pipe 602；Escape pipe 602 welds
It is fixed on the side of outer housing 102, gas outlet flange 601 is welded on the outer end face of escape pipe 602.
As shown in Figure 10, block temperature sensor 701 and nitrogen oxide sensor seat are further fixed on the outer housing 102
702。
The high-temperature exhaust air of engine by air admission unit 2 inlet flange 201, air inlet tube 202, half opening antipriming pipe 203
Sequentially enter the inside of preprocessor shell 1.Entered by the open side of half opening antipriming pipe 203 by drive end bearing bracket 101, outer housing
102, the gas circuit diversion cavity that chamber enclosure 105, fixed cone 107, first partition 501, outer mixing tube 305 are collectively formed is mixed, through gas
Road diversion cavity is guided to around the opening flabellum of outer mixing tube 305.Aqueous solution of urea to be sprayed by fluid path is provided to be sprayed into it
The vertical impact air-flow in direction.
Aqueous solution of urea passes sequentially through V-type clip assembly 312, band gap benching tunnelling method by the fluid path diversion cavity of mixed cell 3
Orchid 311, urea nozzle seat 310, urea nozzle seat welding pedestal 309, transition pedestal 308, band boss mouth step flange 307, liquid
Road import pedestal 306 introduces inside outer mixing tube 305, and impacts and mix with the high-temp waste gas provided by gas circuit in air admission unit 2
It closes.Sufficiently the high-temp waste gas of the aqueous solution of urea of fluid path and gas circuit is sufficiently mixed through interior mixing tube 304, porous end cap 303 again
Hydrolysis generates ammonia, provides reducing agent for the selective catalysis reduction reaction of SCR unit.
The wherein detachable urea nozzle connection structure V-type clip assembly 312 of mixed cell 3, band gap step flange
311, urea nozzle seat 310, urea nozzle seat welding pedestal 309, transition pedestal 308, band boss mouth step flange 307, can be with
Guarantee that the aqueous solution of urea of gas circuit high-temp waste gas and fluid path seals No leakage.V-type clip assembly 312 can be dismantled at any time simultaneously,
Separation is with gap step flange 311 and with boss mouth step flange 307.Observe whether internal mixer generates by peep hole
Urea crystals.Urea crystals are such as generated, the ingot inside peep hole cleaning can also be passed through.
To guarantee that SCR conversion efficiency maximizes, it is desirable to which the reducing agent ammonia that mixed cell 3 imports uniformly flows into SCR
Preceding carrier 401.The gaseous mixture rectified through porous end cap 303 uniformly flows into before SCR in carrier 401 and in the effect of catalyst
Selective catalysis reduction reaction occurs for the nitrogen oxides in lower and exhaust gas.More uniform mixing is rectified by carrier 401 before SCR
Carrier 402 relays the raw selective catalysis reduction reaction of supervention after gas flows into SCR again, and nitrogen oxides is reduced to the limit of emission regulation
Value is following.And the reducing agent of SCR reaction is to hydrolyze the ammonia generated while being also exhaust contaminant.Therefore it needs that SCR will not be participated in
The ammonia of reaction is oxidized to harmless nitrogen and water by the ammoxidation catalyst coated in 402 tail portion of carrier after SCR.
The major function of preprocessor includes reducing to discharge pollutants and reduce exhaust noise, is had been subjected at SCR unit 4
The exhaust gas to discharge pollutants is managed also to need to reduce exhaust noise by muffling unit 5.The exhaust airstream of engine is in the present invention
In the equipment for after-treatment that embodiment provides when flowing by each mixing chamber in mixed cell 3, SCR unit 4, water conservancy diversion cavity,
Integral energy, high-frequency noise will be made to substantially reduce when the structures such as SCR carrier.Using the second noise elimination partition of muffling unit 5
Enter in the noise elimination cavity being collectively formed by first partition 501, the second noise elimination partition 502 and rear end cap 103 after 502 reduction energy
Reactive muffling.
Outlet cell 6 will reduce discharge by SCR unit 4 and discharge and make an uproar by the satisfaction that muffling unit 5 reduces noise
Outside the gaseous mixture discharge assembly of sound regulation.Gas is followed by escape pipe 602, gas outlet flange 601.Nitrogen oxide sensor simultaneously
Whether seat 505, block temperature sensor 504 are disposed on outer housing 102 temperature and nitrogen oxides to monitor exhaust qualified simultaneously
Carry out feedback control.
The flange seal connection structure that preprocessor structure of the invention is positioned using concave-convex step surface band, it is close in guarantee
Detachable urea nozzle holder structure is formed while sealing property, facilitates observation and cleaning preprocessor internal mixer crystallization.Even
Fitting uses V-type clip assembly, simple and reliable, and assembly is much convenient to flange bolt connection structure, and has good compression
Power and centering corrective.
The present invention has a characteristic that arranging that bend pipe and pipeline welding procedure are difficult to meet for urea nozzle pipeline asks
Topic, is integrated on preprocessor using by urea nozzle seat welding assembly, bend pipe and pipeline welding can be changed to stamping parts weldering
Binding structure can reduce difficulty of processing, guarantee machining accuracy and assembly welding precision；
1, aiming at the problem that pipeline uses stainless steel higher cost, the integrated urea nozzle scheme of present invention use can be incited somebody to action
All pipeline cost declinings before preprocessor are non-stainless steel；
2, for the urea crystals leakage of existing pipeline arrangement, corrosion impact aesthetics problem, using flange, close
Packing, clip form sealing, can guarantee gas and the sealing of aqueous solution of urea two-phase；
Accumulating for internal crystallization influences back pressure problems, guarantees high-temperature gas and aqueous solution of urea using urea mixer
Strong convection impact, improves local gas flow velocity, improves Crystallization.
3, emission problem is influenced for crystallization, guarantees that urea is uniformly mixed using urea mixer, improves hydrolysis, reduce
Urea crystals risk improves the utilization rate of SCR carrier.
4, for internal crystallization can not observation problem, observed by detachable urea nozzle holder structure；
5, problem can not be cleared up for internal crystallization, is cleared up by detachable urea nozzle holder structure；
6, aiming at the problem that pipeline arrangement inner wall not can guarantee temperature, using bimetallic tube mixer, intermediate tube is by High Temperature Gas
Body surrounds, and greatly improves the mixing uniformity and percent hydrolysis of aqueous solution of urea, reduces crystallization risk.
7, not can guarantee drop and aiming at the problem that being sufficiently mixed of air-flow, using bimetallic tube mixer structure, external gas
Stream generates strong convection by mixer with internal urea droplets liquid stream, is conducive to the breakup of drop and hydrolysis of urea；
8, existing structure need to guarantee longer mixing apart from aiming at the problem that, using bimetallic tube mixer structure, with enhancing pair
Stream increases rotating flow to shorten mixing distance.
9, long for urea supply pipeline, it is unfavorable for dropping weight cost declining problem.It, can be with using integrated urea nozzle structure
Greatly shorten feeding pipe length.
10, preprocessor is guaranteed using integrated urea nozzle post-processing module for generalization, integrated low problem
The modularization of assembly meets the generalization demand of different automobile types.
Post-processor assembly of the invention can solve pipeline urea nozzle arrangement, pipeline urea leakage crystallization, pipeline
The industry problems of internal urea crystals can freely be applied in the system of close coupling preprocessor.Characteristics of compact layout, it is especially suitable
It is smaller for arrangement space, pipeline difficult arrangement, the system of preprocessor close coupling engine arrangement.Assembly performance is reliable, has
Mixer unit guarantees urea mixing uniformity, greatly promotes anti-urea crystals ability.Part universality is good, fabricates work
Skill is simple, and arrangement is convenient, assembly good reliability, has the very strong market competitiveness.
Using post-processor assembly of the invention, following technical effect can reach:
It can be achieved to reduce pipeline difficulty of processing, improve the purpose of assembly processing and welding precision.
Can be achieved, which reduces pipeline cost, is averaged 150 yuan/meter.
Gas-liquid two-phase can be achieved and seal No leakage, without external urea crystals.
Reduction system can be achieved and crystallize risk, guarantee that system back pressure is stablized, improve the purpose of fuel economy.
It can be achieved to increase urea mixing uniformity, improve percent hydrolysis, improve SCR carrier utilization rate, guarantee that system discharge is full
The purpose of sufficient national emission standard.
Detachable urea nozzle seat can be achieved, guarantee the purpose of internal mixer observable.
Detachable urea nozzle seat can be achieved, guarantee that internal mixer crystallizes the purpose that can be cleared up.
It can be achieved to improve mixing tube wall surface temperature, improve heating rate rate, reduce crystallization risk, reduce oil consumption, promote nitrogen oxygen
The purpose of compound conversion ratio.
The mixing uniformity of good aqueous solution of urea and high-temperature gas can be achieved, improve SCR carrier utilization rate, reduce
The purpose of catalyst noble metal content.
It can be achieved to reduce mixing distance 500mm, reduce the purpose of system arrangement space.
It can be achieved to shorten urea supply length of pipe 500mm, reduce the purpose of system cost.
Post-processor assembly generalization, modularization can be achieved, the vehicle diversification for being very advantageous in post-processor assembly is wanted
Arrangement of summing requires.
Claims (8)
1. a kind of preprocessor structure of detachable integrated urea nozzle, including preprocessor shell (1), air inlet unit (2),
Mixed cell (3), SCR unit (4), muffling unit (5) and outlet cell (6)；It is characterized in that the preprocessor shell
(1) there is columnar mixing chamber, the rear end of mixing chamber is porous end cap in；Air inlet unit (2) is fixed on post-processing
On the drive end bearing bracket (101) of device shell (1), there is partially protruding into preprocessor shell (1) for opening, and it protrudes into post-processing
The axis of device shell (1) inner part is parallel with the axis of mixing chamber；Mixed cell (3) is mounted on preprocessor shell (1)
On side, including urea nozzle seat welding assembly, fluid path assembly, urea mixer assembly；Urea nozzle seat welding assembly passes through
Bolt and gasket are connect with external urea nozzle, and are connect by V-type clip assembly (312) with fluid path assembly；Fluid path assembly
It is connect with urea mixer assembly, urea mixer assembly is located in mixing chamber；SCR unit (4) is located at preprocessor shell
(1) in, front end is connect with mixing chamber, rear end cap (103) of the rear end close to preprocessor shell (1)；Muffling unit (5) cloth
It is placed in the periphery of SCR unit (4)；Outlet cell (6) is arranged on the side of preprocessor shell (1) and close to preprocessor shell
The rear end cap (103) of body (1) is arranged.
2. the preprocessor structure of detachable integrated urea nozzle according to claim 1, it is characterised in that described is mixed
Closing cavity includes mixing chamber end cap (104), mixing chamber enclosure (105), the porous end cap of mixing chamber (106), fixed cone (107)；Institute
The mixing chamber end cap (104) stated is fixed on drive end bearing bracket (101)；Mixing chamber enclosure (105) is located in preprocessor shell (1),
Its front end connects mixing chamber end cap (104), and end connects the miner diameter end of the porous end cap of mixing chamber (106) and fixed cone (107).
3. the preprocessor structure of detachable integrated urea nozzle according to claim 1, it is characterised in that it is described into
Port unit (2) includes inlet flange (201), air inlet tube (202), half opening antipriming pipe (203)；Air inlet tube (202) is stretched
Enter and welds together in inlet flange (201) by circumferencial direction；Air inlet tube (202) protrude into preprocessor shell (1) and with
Half opening antipriming pipe (203) welds together.
4. the preprocessor structure of detachable integrated urea nozzle according to claim 3, it is characterised in that described half
Open porous pipe (203) includes porous section (2031) and half opening section (2032).
5. the preprocessor structure of detachable integrated urea nozzle according to claim 1, it is characterised in that described is mixed
It closes in unit (3), band gap step flange (311), urea nozzle seat (310), urea nozzle seat weld pedestal (309), transition
Pedestal (308) is successively welded together to form dismountable urea nozzle seat welding assembly；Band boss mouth step flange (307),
Fluid path import pedestal (306), outer mixing tube (305) are successively welded together to form fluid path assembly；Band boss mouth step flange
(307) it is fixed on the side of preprocessor shell (1)；Mixing tube (304) and porous end cap in fluid path assembly interior welds
(303) urea mixer assembly is formed；Gap wherein with gap step flange (311) with boss mouth step flange (307)
Step match to be formed circumferentially positioned and be tightly connected using gasket and V-type clip assembly (312)；Urea mixer assembly
Aperture with mixing chamber side is welded.
6. the preprocessor structure of detachable integrated urea nozzle according to claim 2, it is characterised in that the SCR
Unit (4) includes carrier (402) and SCR package casing (403) after carrier (401), SCR before SCR；Before SCR carrier (401) and
Carrier (402) is filled in SCR package casing (403) by carrier liner by tandem and is fixed on outside SCR encapsulation after SCR
SCR assembly is formed in shell (403)；Carrier (401) side before the SCR of SCR assembly and fixed cone (107) circumference soldering are formed into SCR
Unit (4).
7. the preprocessor structure of detachable integrated urea nozzle according to claim 6, it is characterised in that described disappears
Sound unit (5) includes first partition (501) and the second noise elimination partition (502)；First partition (501) and fixed cone (106) major diameter
End and the welding of SCR package casing (403) front end；Second noise elimination partition (502) is welded in the outside of SCR package casing (403)
Portion position.
8. the preprocessor structure of detachable integrated urea nozzle according to claim 1, it is characterised in that described goes out
Gas unit (6) includes gas outlet flange (601) and escape pipe (602)；Escape pipe (602) is weldingly fixed on preprocessor shell
(1) on side, gas outlet flange (601) is welded on the outer end face of escape pipe (602).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507577.6A CN109798168B (en) | 2018-12-11 | 2018-12-11 | Can dismantle post processor structure of integrated urea nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110657007A (en) * | 2019-10-31 | 2020-01-07 | 中自环保科技股份有限公司 | SCR urea mixer for diesel internal combustion engine aftertreatment system |
| CN110671173A (en) * | 2019-09-29 | 2020-01-10 | 潍柴动力股份有限公司 | Engine aftertreatment system and SCR mixer thereof |
| CN110761878A (en) * | 2019-12-03 | 2020-02-07 | 一汽解放汽车有限公司 | Box type integrated urea nozzle post-processor assembly |
| CN112922705A (en) * | 2021-03-11 | 2021-06-08 | 无锡恒和环保科技有限公司 | Novel post-treatment urea mixer for diesel engine |
| CN113530650A (en) * | 2021-07-29 | 2021-10-22 | 东风商用车有限公司 | Efficient SCR (Selective catalytic reduction) cylinder type mixer and vehicle adopting same |
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| CN113530650A (en) * | 2021-07-29 | 2021-10-22 | 东风商用车有限公司 | Efficient SCR (Selective catalytic reduction) cylinder type mixer and vehicle adopting same |
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