CN110761878A - Box type integrated urea nozzle post-processor assembly - Google Patents

Box type integrated urea nozzle post-processor assembly Download PDF

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Publication number
CN110761878A
CN110761878A CN201911220526.XA CN201911220526A CN110761878A CN 110761878 A CN110761878 A CN 110761878A CN 201911220526 A CN201911220526 A CN 201911220526A CN 110761878 A CN110761878 A CN 110761878A
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CN
China
Prior art keywords
assembly
shell
baffle plate
urea nozzle
pipe
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Granted
Application number
CN201911220526.XA
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Chinese (zh)
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CN110761878B (en
Inventor
黄凯
龙远
王科星
邢喜春
朱宏志
朱光贞
刘守顺
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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Priority to CN201911220526.XA priority Critical patent/CN110761878B/en
Publication of CN110761878A publication Critical patent/CN110761878A/en
Application granted granted Critical
Publication of CN110761878B publication Critical patent/CN110761878B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • 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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1827—Sealings specially adapted for exhaust systems
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets or the like
    • 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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • 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
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention belongs to the technical field of engine equipment, and relates to a box type integrated urea nozzle post-processor assembly which comprises a shell, a post-processor and a post-processor, wherein the shell is provided with two axially-through ports and an air inlet arranged on the surface of the shell; the baffle plate assembly is arranged in the shell in a tight fit manner and comprises a first baffle plate and a second baffle plate which are arranged in parallel, the packaging shell is arranged between the first baffle plate and the second baffle plate, the air inlet end of the packaging shell is sequentially connected with the carrier, the gasket, the sound absorbing plate and the circular baffle plate, and the tail pipe connecting pipe is arranged in the mounting holes of the circular baffle plate and the sound absorbing plate in a fit manner; the inner end cover assembly is pressed at the inner end of the shell and comprises an inner end cover and a mixing tube, one end of the mixing tube is connected into a connecting hole at the upper part of the inner end cover, and the edge of the inner end cover is hermetically connected with the shell. The post processor assembly can be conveniently and quickly cleaned and maintained after crystallization is generated in the using process, and has strong arrangement advantages and market competitiveness.

Description

Box type integrated urea nozzle post-processor assembly
Technical Field
The invention belongs to the technical field of engine equipment, and relates to a box type integrated urea nozzle post-processor assembly.
Background
The limit of the exhaust pollutants (mainly particulate PM and nitrogen oxides NOx) in the emission regulations of the fourth and fifth countries is much lower than that in the emission regulations of the third country. The two exhaust pollutants are difficult to be reduced simultaneously in the engine, so that the catalytic reduction aftertreatment system is selected to be one of the technical routes meeting the emission regulations of the fourth country and the fifth country, the content of nitrogen oxide in the exhaust pollutants can be effectively reduced, and the exhaust pollutants of the engine can meet the emission regulations of the fourth country and the fifth country.
With the application of a large number of selective catalytic reduction post-treatment technologies, urea aqueous solution serving as a reducing agent needs to be sprayed into an exhaust pipeline through a urea nozzle in advance to be fully and uniformly mixed with exhaust gas, the mixture is atomized and hydrolyzed to generate ammonia gas, and the ammonia gas and NOx are subjected to oxidation-reduction reaction on a post-processor carrier to remove nitrogen oxides. During the atomization hydrolysis process of the urea aqueous solution, the urea aqueous solution generates solid byproducts such as biuret and melamine, namely urea crystals, due to the influence of conditions such as temperature and flow. Among the many factors affecting crystallization, the requirement of the arrangement condition of the urea nozzle is relatively strict, and the risk of urea crystallization is reduced while the uniformity of urea mixing is ensured. The requirement that the pipeline guarantees a specific bending angle, the welding height of a nozzle seat, the eccentric arrangement of the nozzle and the like so as to guarantee that the urea aqueous solution and the exhaust gas are mixed as uniformly as possible and the wall wetting phenomenon is not easy to occur, so that urea crystallization is caused, and the requirement is difficult to arrange the exhaust pipeline of certain vehicle types.
Along with the high-speed development of the domestic logistics industry and the strict implementation of the national governing overload regulations, a novel working condition appears in the long-distance transport vehicle: the operating conditions of light load and high speed are caused by the fact that a large number of general goods are transported in high-speed logistics, one full-load vehicle is leather shoes and down jackets, the load is about 5 tons, the highway runs for 80-90km/h, the engine is enabled to work within the range of 20% -30% load at about 1300r/min for a long time, and the operating conditions are large in urea injection amount, low in exhaust temperature and easy to form urea crystals. Under this kind of operating mode, the anti-crystallization ability of the mixed structure who arranges the urea nozzle on traditional pipeline is very not enough, need to adopt high-efficient blender urgently, promote mixed structure's urea mixing, the ability of atomizing hydrolysis, reduce the production of crystallization, and arrange the blender on traditional pipeline, the spatial arrangement is difficult, the production technology is complicated, the backpressure of blender is big, and arrange the mixing chamber of after-treatment ware with the urea blender, the space can be fully utilized, realize two functions of misce bene and anti-crystallization simultaneously, the exhaust can be for the wall heating of blender and urea contact simultaneously, greatly reduced the risk of the urea crystallization of the high-speed operating mode of underloading.
In addition, once urea crystallization actually occurs, the user or the service station also needs to have a structure which can observe and clean the crystallization, so that the maintainability of the post-processor is improved, and the service life of the post-processor is prolonged.
Therefore, there is an urgent need for an integrated, modular, simple and low-cost urea nozzle arrangement with a mixer, which can be disassembled for cleaning and inspection, and which can simultaneously achieve uniform mixing of urea and strong urea crystallization resistance.
Disclosure of Invention
Aiming at the problems, the invention provides the box type integrated urea nozzle post-processor assembly, and the post-processor assembly can be conveniently and quickly cleaned and maintained after crystallization is generated in the using process, and has strong arrangement advantages and market competitiveness.
According to the technical scheme of the invention: a box type integrated urea nozzle post-processor assembly is characterized by comprising a shell, a gas inlet and a gas outlet, wherein the shell is provided with two axially through ports and the gas inlet is formed in the surface of the shell;
the baffle plate assembly is arranged in the shell in a tight fit manner and comprises a first baffle plate and a second baffle plate which are arranged in parallel, the packaging shell is arranged between the first baffle plate and the second baffle plate, the air inlet end of the packaging shell is sequentially connected with the carrier, the gasket, the sound absorbing plate and the circular baffle plate, and the tail pipe connecting pipe is arranged in the mounting holes of the circular baffle plate and the sound absorbing plate in a fit manner;
the inner end cover assembly is pressed at the inner end of the shell and comprises an inner end cover and a mixing tube, one end of the mixing tube is connected into a connecting hole at the upper part of the inner end cover, the edge of the inner end cover is hermetically connected with the shell, the inner end of the mixing tube corresponding to the inner end cover is connected with a first port seat, and the mixing tube is supported in mounting holes at the upper parts of a first partition plate and a second partition plate;
the urea nozzle seat assembly is hermetically connected to the air inlet end of the partition plate assembly;
the air inlet pipe assembly is connected with an air inlet of the shell;
and the outer end cover assembly is connected to the outer port of the shell in a sealing manner.
As a further improvement of the invention, a mixer is arranged on one end surface of the mixing pipe close to the inner end cover.
As a further improvement of the invention, the outer end cover assembly comprises an outer end cover, a bracket and a guide plate, wherein the bracket is fixed on the outer end cover, the guide plate is arranged on the bracket, and the guide plate is arranged at the axial outer end of the gas outlet side of the mixing pipe.
As a further improvement of the invention, the outer end cover is provided with an airflow guide groove, and the lower part of the airflow guide groove corresponds to the axial air inlet port of the shell.
As a further improvement of the invention, the urea nozzle seat assembly comprises an installation pipe, a heat preservation pipe, a urea nozzle seat and a second opening seat, wherein the heat preservation pipe is arranged in the installation pipe and is fastened through the second opening seat, and the urea nozzle seat is arranged on the installation seat formed at the inner shaft end of the heat preservation pipe.
As a further improvement of the invention, the air inlet pipe assembly comprises a square flange and an air inlet pipe which is tightly connected with the square flange through a hexagon nut.
As a further improvement of the invention, the urea nozzle seat assembly is fixedly connected to the inner end cover assembly through a clamping ring.
As a further improvement of the invention, the tail pipe adapter is connected with an arc-shaped tail pipe.
The invention has the technical effects that: the product of the invention has simple and reasonable structure, can effectively realize the rotational flow mixing technology, sequentially passes through the mixing unit, the post-processing unit and the silencing unit in the whole exhaust flowing process, and the mixing unit adopts a non-contact rotational flow mixing structure formed by the rotational flow mixer and the guide plate, thereby fully ensuring the uniform mixing of the urea aqueous solution and reducing the risk of urea crystallization. Firstly, exhaust gas enters the middle cavity to heat the outer side pipe wall of the cyclone mixer, so that the wall surface temperature is improved, the urea aqueous solution is easier to evaporate after wetting the wall, and the thickness of a liquid film on the wet wall is reduced, thereby reducing the risk of crystallization; secondly, exhaust gas is mixed with the urea aqueous solution after passing through the spinning disk, and the exhaust gas rotates in the mixing pipe to advance, so that the mixing distance of the urea aqueous solution and the exhaust gas is increased, the heat exchange between the exhaust gas and the urea aqueous solution is facilitated, the atomization and hydrolysis of the urea aqueous solution are more sufficient, the risk of urea crystallization is reduced, and the mixing uniformity of the urea is improved.
The most key technology of the product is a detachable urea nozzle seat structure for ensuring the sealing property. The structure is a sealing structure of a concave-convex step mouth seat, an annular sealing gasket and a V-shaped clamp assembly. Can well ensure the sealing performance, does not generate gas and urea leakage, and can be repeatedly used for many times. This technique ensures that once urea crystallisation and blockage have indeed occurred, we can observe it by opening the detachable structure. Meanwhile, the urea mixing pipe can be completely observed and cleaned after the structure is opened, the size of the opening is ensured to be more than 100mm, the urea crystal can be conveniently cleaned by a tool, the failure replacement of the whole postprocessor assembly caused by the urea crystal is avoided, and the maintainability of the postprocessor is greatly improved.
The post-processor adopts the scheme of integrating the urea nozzle seat, and the integration, the universality and the attractiveness of the system can be greatly improved. When the difficulty of arranging the exhaust pipeline is greatly reduced, the urea nozzle is arranged on the postprocessor, the material of the exhaust pipeline can be changed from a stainless steel pipeline to a low-carbon steel pipeline and protected by a coating, and the cost can be reduced by more than 60%. The arrangement of the urea supply pipeline and the cooling water pipe is more reasonable and tidy, and meanwhile, the length of the pipeline can be correspondingly shortened, and the cost is reduced.
Drawings
FIG. 1 is an external appearance and cross-sectional view of a box-type integrated urea nozzle aftertreatment assembly.
FIG. 2 is an exploded view of the box-type integrated urea nozzle aftertreatment assembly.
FIG. 3 is an exploded view of the baffle assembly.
FIG. 4 is an exploded view of the inner end cap assembly.
FIG. 5 is an exploded view of the outer end cap assembly.
FIG. 6 is an exploded view of the urea nozzle carrier assembly.
FIG. 7 is an exploded view of the air intake duct assembly.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In fig. 1 to 7, the device comprises a nitrogen-oxygen sensor seat 1, a snap ring 2, a urea nozzle seat assembly 3, a gasket 4, an inner end cover assembly 5, an air inlet pipe assembly 6, a temperature sensor seat 7, an outer end cover assembly 8, a partition plate assembly 9, a tail pipe 10, a circular partition plate 11, a sound absorbing plate 12, a tail pipe adapter pipe 13, a first partition plate 14, a gasket 15, a carrier 16, a packaging shell 17, a second partition plate 18, a first port seat 19, an inner end cover 20, a mixing pipe 21, a guide plate 22, a support 23, an outer end cover 24, a shell 25, a second port seat 26, a urea nozzle seat 27, a heat preservation pipe 28, an installation pipe 29, a square flange 30, a hexagon nut 31, an air inlet pipe 32 and the like.
As shown in fig. 1 to 7, the invention relates to a box-type integrated urea nozzle postprocessor assembly, which comprises a shell 25, wherein two axial ends of the shell 25 are of an open structure, a partition plate assembly 9 is tightly arranged in the shell 25 in a matching manner, the partition plate assembly 9 comprises a first partition plate 14 and a second partition plate 18 which are arranged in parallel, the edges of the first partition plate 14 and the second partition plate 18 are attached to the inner wall of the shell 25, an encapsulation shell 17 is arranged in mounting holes of the first partition plate 14 and the second partition plate 18 in a matching manner, a carrier 16, a liner 15, a tail pipe adapter 13, a sound absorbing plate 12 and a circular partition plate 11 are sequentially arranged at the axial inner end of the encapsulation shell 17, the tail pipe adapter 13 is arranged in mounting holes of the circular partition plate 11 and the sound absorbing plate 12 in a matching manner, the axial end part of the tail pipe 13 is connected with an arc-shaped tail pipe.
The inner end cover assembly 5 is connected to the partition assembly 9 in a matched mode, the inner end cover assembly 5 comprises an inner end cover 20 and a mixing pipe 21 connected to the inner end cover 20, an inlet of the mixing pipe 21 penetrates through the inner end cover 20 and is connected with a first port base 19, a mixer is arranged on the mixing pipe 21 and close to the inner end cover 20, the mixer is structurally characterized in that a plurality of air guide blades are uniformly distributed on the mixing pipe 21 in the circumferential direction, each air guide blade is provided with a strip-shaped air inlet communicated with the inner cavity of the mixing pipe 21 in a matched mode, and the edge of the inner end cover 20 is fixedly connected to the shell 25. The outer end of the mixing pipe 21 is inserted into the support holes of the first partition plate 14 and the second partition plate 18, wherein the size of the support hole of the first partition plate 14 is larger than the outer diameter of the mixing pipe 21, so that the engine airflow can effectively pass through the mixer part of the mixing pipe 21, enter the mixing pipe 21, flow towards one side of the outer end cover assembly 8, flow into the package housing 17 through the inner side surface of the outer end cover 24, and be discharged through the tail pipe 10 at the end of the package housing 17. It will be appreciated that the inlet end of the mixing tube 21 is connected to a mixer 34, a ring of blades are uniformly arranged on the circumferential surface of the mixer 34, and a sound-deadening unit 33 is arranged between the first partition 14 and the inner end cap 20.
The inner end axial end part of the inner end cover assembly 5 is sequentially connected with the dense piece 4 and the urea nozzle seat assembly 3, and the urea nozzle seat assembly 3 is fastened on a first opening seat 19 of the inner end cover assembly 5 through a snap ring 2.
Urea nozzle holder assembly 3 is including installation pipe 29, insulating tube 28, urea nozzle holder 27 and second mouthful seat 26, wherein installation pipe 29 tight fit is connected on first mouthful seat 19, insulating tube 28 cooperation sets up in installation pipe 29, urea nozzle holder 27 is installed on insulating tube 28, second mouthful seat 26 and insulating tube 28 fastening connection, in order to realize urea nozzle holder 27 and insulating tube 28 reliable firm being connected, be provided with on insulating tube 28 with urea nozzle holder 27 matched with structure.
The area of the shell 25 corresponding to the area between the first partition 14 and the second partition 18 is provided with an air inlet, and the air inlet pipe assembly 6 is connected to the air inlet in a tight fit manner. The air inlet pipe assembly 6 comprises a square flange 30 and an air inlet pipe 32 fixedly connected with the square flange 30, and the square flange 30 and the air inlet pipe 32 are fixedly connected through a hexagon nut 31.
An outer end cover assembly 8 is arranged on an outer end sealing cover of the shell 25, the outer end cover assembly 8 comprises an outer end cover 24, an air guide groove is formed in the inner surface of the outer end cover 24, a support 23 is arranged in the air guide groove of the outer end cover 24, a guide plate 24 is connected to the support 23, the guide plate 24 is arranged at an axial air outlet end of the mixing pipe 21, and the lower end of the air guide groove extends to an air inlet of the packaging shell 17. In order to effectively monitor the temperature of the air flow, a temperature sensor seat 7 is arranged on the shell 25 between the outer end corresponding to the partition plate assembly 9 and the outer end cover assembly 8.
According to the invention, a concave-convex step surface and positioning opening seat sealing connection structure is adopted, a concave step surface is arranged on the heat preservation pipe 28, a convex step surface is arranged on the urea nozzle seat 27, and the convex step surface of the urea nozzle seat 27 is tightly matched with the concave step surface, so that a detachable urea nozzle seat structure is formed while the sealing performance is ensured, and the internal crystal of the post-processor mixer is convenient to observe and clean. The connecting piece adopts a V-shaped groove clamp assembly, is simple and reliable, is far convenient to assemble in a flange bolt connecting structure, and has good pressing force and centering correction.
The post-processor assembly disclosed by the invention can solve the industrial problems of pipeline urea nozzle arrangement, pipeline urea leakage crystallization and pipeline internal urea crystallization, and can be freely applied to a system of a tightly coupled post-processor. The system is compact in arrangement, and is particularly suitable for a system which has small arrangement space, is difficult to arrange pipelines and is closely coupled with an engine by an postprocessor. The assembly performance is reliable, the mixer unit ensures the urea mixing uniformity, and the urea crystallization resistance is greatly improved. The parts have good universality, simple processing and manufacturing process, convenient arrangement of the whole vehicle, good assembly reliability and strong market competitiveness.

Claims (8)

1. A box type integrated urea nozzle post-processor assembly is characterized by comprising a shell (25) and a post-processor, wherein the shell (25) is provided with two axially-through ports and an air inlet arranged on the surface of the shell (25);
the baffle plate assembly (9) is arranged in the shell (25) in a tight fit manner and comprises a first baffle plate (14) and a second baffle plate (18) which are arranged in parallel, the packaging shell (17) is arranged between the first baffle plate (14) and the second baffle plate (18), the air inlet end of the packaging shell (17) is sequentially connected with the carrier (16), the gasket (15), the sound absorbing plate (12) and the circular baffle plate (11), and the tail pipe connecting pipe (13) is arranged in the mounting holes of the circular baffle plate (11) and the sound absorbing plate (12) in a matched manner;
the inner end cover assembly (5) is pressed at the inner end of the shell (25) and comprises an inner end cover (20) and a mixing pipe (21), one end of the mixing pipe (21) is connected into a connecting hole at the upper part of the inner end cover (20), the edge of the inner end cover (20) is hermetically connected with the shell (25), the inner end of the mixing pipe (21) corresponding to the inner end cover (20) is connected with a first port seat (19), and the mixing pipe (21) is supported in mounting holes at the upper parts of the first partition plate (14) and the second partition plate (18);
the urea nozzle seat assembly (3) is connected to the air inlet end of the partition plate assembly (9) in a sealing mode;
an intake pipe assembly (6) connected to an intake port of the housing (25);
and the outer end cover assembly (8) is connected to the outer port of the shell (25) in a sealing mode.
2. The box-type integrated urea nozzle aftertreatment assembly according to claim 1, wherein the mixing tube (21) is provided with a mixer near one end surface of the inner end cap (20).
3. The box-type integrated urea nozzle aftertreatment assembly according to claim 1, wherein the outer end cover assembly (8) comprises an outer end cover (24), a bracket (23) and a baffle plate (22), the bracket (23) is fixed on the outer end cover (24), the baffle plate (22) is arranged on the bracket (23), and the baffle plate (22) is arranged at the axial outer end of the air outlet side of the mixing pipe (21).
4. The box-type integrated urea nozzle aftertreatment assembly according to claim 3, wherein the outer end cap (24) is provided with an air flow guide groove, and the lower part of the air flow guide groove corresponds to the axial air inlet port of the outer shell (17).
5. The box-type integrated urea nozzle post-processor assembly according to claim 1, wherein the urea nozzle holder assembly (3) comprises a mounting pipe (29), a heat preservation pipe (28), a urea nozzle holder (27) and a second port holder (26), the heat preservation pipe (28) is arranged in the mounting pipe (29) and is fastened through the second port holder (26), and the urea nozzle holder (27) is arranged on the mounting seat formed at the inner shaft end of the heat preservation pipe (28).
6. The box-type integrated urea nozzle aftertreatment assembly according to claim 1, wherein the air inlet pipe assembly (6) comprises a square flange (30) and an air inlet pipe (32) which is fixedly connected with the square flange (30) through a hexagon nut (31).
7. The box-type integrated urea nozzle aftertreatment assembly according to claim 1, wherein the urea nozzle holder assembly (3) is fixedly connected to the inner end cap assembly (5) by a snap ring (2).
8. The box-type integrated urea nozzle aftertreatment assembly according to claim 1, wherein the tailpipe connection (13) is connected to an arc-shaped tailpipe (10).
CN201911220526.XA 2019-12-03 2019-12-03 Box-type integrated urea nozzle post-processor assembly Active CN110761878B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911220526.XA CN110761878B (en) 2019-12-03 2019-12-03 Box-type integrated urea nozzle post-processor assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911220526.XA CN110761878B (en) 2019-12-03 2019-12-03 Box-type integrated urea nozzle post-processor assembly

Publications (2)

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