CN209510424U - A kind of preprocessor structure of detachable integrated urea nozzle - Google Patents

Abstract

The utility model 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.The utility model integrated level 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

A kind of preprocessor structure of detachable integrated urea nozzle

Technical field

The utility model relates to the preprocessor structures that a kind of square detachably integrates urea nozzle, suitable for meeting state IV, state V, state's VI regulation diesel oil commercial vehicle.

Background technique

Diesel engine state IV, state V, state VI emission regulation in exhaust contaminant (mainly particle and oxynitrides NOx limit value) reduces many compared with national Ⅲ emission regulation.It is difficult to realize simultaneously in engine machine and reduces above two row Gas pollutant, SCR (selective catalysis reduction) system can be effectively reduced the content of oxynitrides in exhaust contaminant, make engine Exhaust contaminant meet 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 it urinates The arrangement requirement of plain 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 to spray The arrangements requirement such as mouth and pipeline biasing.The bend pipe and pipeline welding procedure of existing pipeline arrangement are difficult to meet above-mentioned requirements；

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. there may be urea crystals for aqueous solution of urea, there may be let out for the pipeline urea crystals of existing pipeline arrangement 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 pipeline and after It generates and accumulates inside processor, 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 can not then be used as SCR The reducing agent ammonia of reaction participates in selective catalysis reduction reaction, may cause the exceeded failure of vehicle nitrogen oxides, or even limit whole Vehicle output torque；

6. there may be urea crystals, existing pipeline arrangements to observe inside preprocessor at any time for aqueous solution of urea Whether generation crystallizes；

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 The arrangement of no mixer not can guarantee drop and being sufficiently mixed for air-flow guarantees urea mixing uniformity and ammonia evaporation 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, is unfavorable for Weight cost declining drops；

12. there are various (loading, traction, self-unloading, harmful influences etc.) for vehicle, generalization, integrated, module as far as possible is needed Change to guarantee product diversity.Existing pipeline arrangement is unfavorable for generalization, integrated, modularization.

To solve the above problems, exhaust system is required to reduce urea crystals wind while guaranteeing urea mixing uniformity Danger.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 Strong, high, the detachable dress watch of heat utilization efficiency, the simple low cost of sealing, with mixer, anti-urea crystals ability Urea nozzle arrangement, arrangement difficulty can be reduced, realize urea it is uniform mixing and very strong anti-urea crystals ability.

Summary of the invention

The technical problem to be solved by the present invention is to provide a kind of integrated-type, modular detachably integrated urea sprays Whether the preprocessor structure of mouth, the structure dissembling inspection preprocessor inside and mixer can generate urea crystals at any time, and The internal urea crystals generated of cleaning can be dismantled at any time.

In order to solve the above-mentioned technical problem, the preprocessor structure of the detachable integrated urea nozzle of the utility model, packet Include preprocessor shell, air inlet unit, mixed cell, SCR unit, muffling unit and outlet cell；The preprocessor There is columnar mixing chamber, the rear end of mixing chamber is porous end cap in shell；Air inlet unit is fixed on preprocessor On the drive end bearing bracket of shell, there is partially protruding into preprocessor shell for opening, and it protrudes into preprocessor enclosure interior point Axis it is parallel with the axis of mixing chamber；Mixed cell is mounted on the side of preprocessor shell, including urea nozzle seat Welding assembly, fluid path assembly, urea mixer assembly；Urea nozzle seat welding assembly passes through bolt and gasket and external urea Nozzle 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 Side on and close to preprocessor shell rear end cap arrange.

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 The miner diameter end of the porous end cap of end connection 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 method Weld together in orchid by circumferencial direction；Air inlet tube protrudes into preprocessor shell and is welded on one with half opening antipriming pipe It rises.

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 pedestal, Outer mixing tube is successively welded together to form fluid path assembly；The side of preprocessor shell is fixed on boss mouth step flange On；Mixing tube and porous end cap form urea mixer assembly in fluid path assembly interior welds；Wherein with gap step flange Gap matches to be formed circumferentially positioned and connected using gasket and the sealing of V-type clip assembly with the step with boss mouth step flange It connects；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 the side of preprocessor shell On face, gas outlet flange welding is on the outer end face of escape pipe.

The utility model using urea nozzle seat is directly integrated be arranged on preprocessor and with urea mixer assembly Be used cooperatively, can well solve pipeline, urea nozzle difficult arrangement, urea mixing uniformity be difficult to guarantee, anti-urea crystals energy The problems such as power is insufficient.

The utility model is in the junction of urea nozzle seat and preprocessor by traditional nozzle carrier and pipeline welding manner It is changed to flange gasket connection type, guarantees detachable, the observable of urea nozzle seat while guaranteeing sealing.It can tear open at any time It unloads and checks whether generate urea crystals with mixer inside preprocessor.The internal urea crystals generated of cleaning can be dismantled at any time. The utility model integrated level is high, simple at low cost.

The utility model most critical technology is the detachable urea nozzle holder structure for guaranteeing leakproofness.The structure is concave and convex platform Rank 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, and can pass through and open detachable urine Plain nozzle carrier structure observation.Urea mixing tube can be observed completely and be cleared up to the structure after opening simultaneously, and aperture size guarantees 80mm or more facilitates and simply clears up a small amount of urea crystals with tool.Entire post-processor assembly caused by avoiding because of urea crystals 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 etc. It can shorten.Completely eliminate influence of the pipeline foozle to urea crystals.Modular assembly is relatively reliable, more advantageous logical With change.

Increase urea mixer inside preprocessor, adds the structure of mixing chamber to greatly improve using the inside and outside spinning disk of original creation The gas of gas circuit supply enters the uniformity of mixing tube.The design of inside and outside mixing tube can greatly improve the mutual impact of gas-liquid Effect.Allow even into gas adequately impact fluid path penetrating urea, be crushed urea droplets adequately, hydrolyze.Simultaneously For hydrolytic process in mixing tube, extraneous gas substantially increases mixing tube temperature, 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 Detachable structure is then opened observation and cleaning by situation.

Detailed description of the invention

Fig. 1 is that the square of the utility model detachably integrates the preprocessor structural perspective of urea nozzle.

Fig. 2 is that the square of the utility model detachably integrates the preprocessor structure sectional view of urea nozzle.

Fig. 3 is the gas circuit fluid path signal that the square of the utility model detachably integrates the preprocessor structure of urea nozzle Figure.

Fig. 4 is the cross-sectional view of assembly air inlet unit.

Fig. 5 is half opening antipriming pipe perspective view.

Fig. 6 is the partial perspective view of the utility model.

Fig. 7 a is the partial sectional view of mixed cell, and Fig. 7 b is the partial enlarged view of Fig. 7 a.

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, Mix chamber enclosure；106, the porous end cap of mixing chamber；107, fixed cone；2, air inlet unit；201, inlet flange；202, air inlet connecting Pipe；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 pedestal；309, it urinates Plain nozzle carrier welds pedestal；310, urea nozzle seat；311, band gap step flange；312, V-type clip assembly；4, SCR unit； 401, carrier before SCR；402, carrier after SCR；403, SCR package casing；501, first partition；502, the second noise elimination partition；6, Outlet cell；601, gas outlet flange；602, escape pipe；701, block temperature sensor；702, nitrogen oxide sensor seat.

Specific embodiment

The utility model is described in further detail below by specific embodiment and in conjunction with attached drawing.

As shown in Figure 1, Figure 2, Figure 3 shows, the preprocessor structure of the detachable integrated urea nozzle of the utility model is series connection 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 include weld together drive end bearing bracket 101, outer housing 102, Rear end cap 103；There is columnar mixing chamber in preprocessor shell 1；Mixing chamber include be welded and fixed together it is mixed Close 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 is fixed It is arranged on drive end bearing bracket 101 in the front end of mixing chamber enclosure 105；Mixing chamber enclosure 105 is located in preprocessor shell 1, end The miner diameter end of the porous end cap 106 of end connection 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 tube 202 protrude into inlet flange 201 and weld together by circumferencial direction；Air inlet tube 202 protrudes into drive end bearing bracket 101 and and half opening Antipriming pipe 203, which welds together, constitutes drive end bearing bracket welding assembly；Half opening antipriming pipe 203 is by porous section 2031 of front and rear portion Half opening section 2032 constitute；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 includes urea nozzle seat welding assembly, fluid path assembly, urine Plain mixer assembly；Band gap step flange 311, urea nozzle seat 310, urea nozzle seat weld pedestal 309, transition pedestal 308 are successively welded together to form dismountable urea nozzle seat welding assembly；After band boss mouth step flange 307 is fixed on On the side for managing device shell 1；Band boss mouth step flange 307, fluid path import pedestal 306, outer mixing tube 305 are successively welded on one It rises and forms fluid path assembly；Mixing tube 304 and porous end cap 303 form urea mixer assembly in fluid path assembly interior welds；Its The middle gap with gap step flange 311 matches to be formed circumferentially positioned and used with the step with boss mouth step flange 307 Gasket and V-type clip assembly 312 are tightly connected；Urea mixer assembly is welded with the aperture for mixing 105 side of chamber enclosure.

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 107 bigger diameter end of fixed cone and 403 front end of SCR package casing；Second noise elimination partition 502 is welded on SCR package casing On the outside of 403 middle part.

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 702 are further fixed on the outer housing 102.

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 with by air admission unit 2 gas circuit provide high-temp waste gas impingement mix. The high-temp waste gas of the aqueous solution of urea of fluid path and gas circuit is sufficiently sufficiently mixed water through interior mixing tube 304, porous end cap 303 again Solution 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 urine by peep hole Element crystallization.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 under the effect of the catalyst Selective catalysis reduction reaction occurs with the nitrogen oxides in exhaust gas.More uniform gaseous mixture is rectified again by carrier 401 before SCR Carrier 402 relays the raw selective catalysis reduction reaction of supervention after flowing into SCR, by nitrogen oxides be reduced to the limit value of emission regulation with Under.And the reducing agent of SCR reaction is to hydrolyze the ammonia generated while being also exhaust contaminant.Therefore need not participate in SCR reaction Ammonia harmless nitrogen and water are oxidized to by the ammoxidation catalyst of 402 tail portion of carrier after being coated in 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 practical at this Pass through each mixing chamber, the water conservancy diversion in mixed cell 3, SCR unit 4 when flowing in the equipment for after-treatment that new embodiment provides Integral energy, high-frequency noise will be made to substantially reduce when the structures such as cavity, SCR carrier.Using muffling unit 5 second eliminate the noise every Plate 502 enters in the noise elimination cavity being collectively formed by first partition 501, the second noise elimination partition 502 and rear end cap 103 after reducing 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 seat simultaneously 505, block temperature sensor 504 is disposed on outer housing 102 whether qualification is gone forward side by side with the temperature of monitoring exhaust and nitrogen oxides Row feedback control.

The preprocessor structure of the utility model is being guaranteed using the flange seal connection structure of concave-convex step surface band positioning Detachable urea nozzle holder structure is formed while sealing performance, facilitates observation and cleaning preprocessor internal mixer crystallization. Connector uses V-type clip assembly, simple and reliable, and assembly is much convenient to flange bolt connection structure, and has good pressure Clamp force and centering corrective.

The utility model has the following characteristics: being difficult to meet for urea nozzle pipeline arrangement bend pipe and pipeline welding procedure Problem is integrated on preprocessor using by urea nozzle seat welding assembly, bend pipe and pipeline welding can be changed to stamping parts Welding 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 utility model, can using integrated urea nozzle scheme With by all pipeline cost declinings before preprocessor be non-stainless steel；

2, for the urea crystals leakage of existing pipeline arrangement, corrosion impact aesthetics problem, using flange, sealing Pad, 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 that high-temperature gas and aqueous solution of urea are strong using urea mixer Convection current 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 urine Element crystallization 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.Using integrated urea nozzle structure, Ke Yi great It is big to 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.

The post-processor assembly of the utility model can solve pipeline urea nozzle arrangement, pipeline urea leakage crystallization, pipe The industry problems of urea crystals, can freely apply in the system of close coupling preprocessor inside road.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, process for machining and manufacturing Simply, arrangement is convenient, assembly good reliability, has the very strong market competitiveness.

Using the post-processor assembly of the utility model, 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, reduction is urged The purpose of agent bullion 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 (107) 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).