CN213743605U

CN213743605U - Vehicle aftertreatment SCR mixer

Info

Publication number: CN213743605U
Application number: CN202022962571.7U
Authority: CN
Inventors: 宋爽
Original assignee: Tianjin Jinyu Power Technology Co ltd
Current assignee: Tianjin Jinyu Power Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-07-20
Anticipated expiration: 2030-12-10

Abstract

The utility model relates to a SCR blender technical field discloses an automobile-used aftertreatment SCR blender, including U type elbow, the one end of U type elbow is connected with the exhaust entry, and the other end intercommunication of U type elbow has the urceolus, the inside fixedly connected with guide plate of U type elbow, the one end inboard of urceolus is provided with the whirl bucket, and the one end department that the lateral surface of urceolus corresponds the whirl bucket is provided with the urea sprayer, the lower extreme inboard of whirl bucket is connected with the holding ring, the inner wall distribution of holding ring has a plurality of whirl leaf, the inside bottom department welding that is located the whirl bucket of urceolus has the vortex storehouse, the top welding that the lateral surface of whirl bucket is located the vortex storehouse. The invention can enhance the mixing of the urea and the exhaust tail gas, reduce the flow dead zone in the mixer and enhance the air disturbance at the urea drop point under the condition of not increasing the flow resistance, thereby accelerating the decomposition and evaporation of the urea, effectively reducing the wall surface liquid film and greatly reducing the generation of urea crystals.

Description

Vehicle aftertreatment SCR mixer

Technical Field

The utility model relates to a SCR blender technical field specifically is an automobile-used aftertreatment SCR blender.

Background

Urea-SCR (Urea-selective catalytic reduction) is a main technical means for reducing NOx emission of a national six-diesel locomotive, and is a technology for eliminating nitrogen oxides in tail gas of a diesel engine by utilizing catalytic reduction reaction of ammonia gas and NOx, and an SCR mixer is a device arranged between an exhaust pipe and an SCR carrier and is mainly used for improving the mixing uniformity between Urea spray and waste gas, increasing ammonia evaporation and improving NOx conversion efficiency;

however, the risk of urea crystallization is high in the use process of the existing SCR mixer, so that the problems of increase of the oil consumption of the whole vehicle, reduction of the NOx conversion efficiency after treatment and the like are caused; accordingly, one skilled in the art provides an aftertreatment SCR mixer for a vehicle that solves the problems set forth in the background above.

Disclosure of Invention

An object of the utility model is to provide an automobile-used aftertreatment SCR blender to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an automobile-used aftertreatment SCR blender, includes U type elbow, the one end lower surface of U type elbow is connected with the exhaust entry, and the other end intercommunication of U type elbow has the urceolus, the inside fixedly connected with guide plate of U type elbow, the one end inboard of urceolus is provided with the whirl bucket, and the lateral surface of urceolus corresponds the one end department of whirl bucket and is provided with the urea sprayer, the lower extreme inboard of whirl bucket is connected with the holding ring, the inner wall distribution of holding ring has a plurality of whirl leaf, the inside department welding that is located the bottom of whirl bucket of urceolus has the vortex storehouse, the lateral surface of whirl bucket is located the top welding in vortex storehouse and has the baffle of blocking, the other end of urceolus is provided with the exhaust outlet, and the inside of urceolus closes on one side in the vortex storehouse and is provided with the perforated plate.

As a further aspect of the present invention: the U-shaped elbow comprises an inner layer and an outer layer, the inner layer and the outer layer are stainless steel plates, one end of the blocking baffle is connected with a connecting plate, the middle of the blocking baffle is located on the outer side face of the cyclone barrel, a clamping groove is formed in the outer side face of the blocking baffle, a plurality of small holes are distributed in the outer side face of the lower end of the blocking baffle, the upper end of the blocking baffle and the inner side wall of the U-shaped elbow are fixed through welding of the connecting plate, and the lower end of the blocking baffle is clamped on the outer side face of the cyclone barrel through the clamping groove and is fixed through welding.

As a further aspect of the present invention: the upper end in vortex storehouse and the lower surface welded fastening of whirl bucket, and the lower extreme in vortex storehouse and the inside wall welded fastening of urceolus, the one end side in vortex storehouse corresponds the air-out punishment of U type elbow and has a plurality of windward hole, and the one end side in vortex storehouse is located windward hole below and is provided with the windward groove, the one end in vortex storehouse is located and sets up the splitter box between the inside wall of the below in windward groove and urceolus, and the other end side in vortex storehouse corresponds the perforated plate punishment and has distributed a plurality of exhaust vent.

As a further aspect of the present invention: the outer side of the outer barrel is provided with a mounting seat at the bottom end of the urea injector, the mounting seat is fixed on the upper surface of the outer barrel through bolts, and the urea injector and the cyclone barrel are coaxially arranged.

As a further aspect of the present invention: the upper end of the rotational flow barrel is circularly cut with a plurality of inward bent flow guide vanes, the top end of the rotational flow barrel is welded at one end of the upper surface of the outer barrel, which is positioned on the urea injector, and the side surface of the other end of the rotational flow barrel is welded and fixed with the flow guide plate.

As a further aspect of the present invention: the whirl leaf is including installing a plurality of upper blade that is circular distribution in holding ring inner wall upper end, the below that the inner wall of holding ring is located the upper blade is circular distribution and has a plurality of lower blade, the quantity of upper blade and lower blade is the same, and upper blade and lower blade stagger each other in the position of holding ring inner wall, upper blade and lower blade are the distortion form, and upper blade and lower blade all with the inner wall welded fastening of holding ring, the whirl leaf is fixed mutually through the holding ring with the whirl bucket.

As a further aspect of the present invention: the surface distribution of perforated plate has a plurality of bleeder vents, and the perforated plate is a circular structure, the external diameter of perforated plate and the internal diameter looks adaptation of urceolus, and perforated plate and urceolus fixed connection.

As a further aspect of the present invention: one end of the outer barrel is communicated with the air outlet end of the U-shaped elbow, and the outer barrel is of a double-layer pipe structure.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model relates to a vehicle post-treatment SCR mixer, which is in actual operation;

1. the utility model does not change the peripheral structure of the original post-treatment, can directly replace the original SCR mixer, has compact structure, and does not influence the arrangement of the original urea injection system and the post-treatment of the whole vehicle;

2. heat exchange with the external environment is reduced, the temperature of the mixer is raised as fast as possible during cold start, the temperature and airflow speed of liquid drops attached to the wall are raised in the urea injection process, evaporation and decomposition are accelerated, and the crystallization risk is reduced;

3. the flow distribution of the tail gas in the mixer is optimized, the space is reasonably utilized, the flow resistance is reduced, the unidirectional flow of the tail gas is converted into vortex, the utilization rate of the tail gas is improved in a limited space, and the mixing of urea spray and the tail gas is promoted;

4. analyzing and eliminating a flow dead zone from a flow angle, avoiding urea crystallization caused by retention of urea liquid drops, enhancing the mixing of urea spray and tail gas in a sectional manner, accelerating the evaporation of the liquid drops and the decomposition of the urea, and reducing the crystallization risk;

5. the uniformity of the air flow speed and the ammonia distribution uniformity at the front end of the SCR catalyst are improved through optimized design, and the SCR conversion efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of an internal structure of an outer cylinder in an automotive aftertreatment SCR mixer;

FIG. 2 is a cross-sectional view of a U-bend and outer barrel of a vehicular aftertreatment SCR mixer;

FIG. 3 is a schematic diagram of a spoiler bin in an automotive aftertreatment SCR mixer;

FIG. 4 is a schematic structural view of an outer barrel in an automotive aftertreatment SCR mixer;

FIG. 5 is a schematic view of the mounting of the guide vanes in an automotive aftertreatment SCR mixer;

FIG. 6 is a schematic view of the distribution of swirl vanes in a vehicular aftertreatment SCR mixer;

FIG. 7 is a schematic diagram of a blocker plate in an automotive aftertreatment SCR mixer.

In the figure: 1. a U-shaped elbow; 2. a baffle; 3. a cyclone barrel; 4. a swirl vane; 5. a turbulent flow bin; 6. blocking the partition plate; 7. a perforated plate; 8. an outer cylinder; 9. an exhaust outlet; 10. an exhaust gas inlet; 11. a urea injector; 12. an inner layer; 13. an outer layer; 14. a mounting seat; 15. a positioning ring; 31. a guide vane; 41. an upper blade; 42. a lower blade; 51. a shunt slot; 52. a windward tank; 53. a windward hole; 54. an air outlet; 61. a connecting plate; 62. a small hole; 63. a clamping groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 7, in an embodiment of the present invention, an SCR mixer for post-treatment of a vehicle includes a U-shaped elbow 1, an exhaust inlet 10 is connected to a lower surface of one end of the U-shaped elbow 1, and the other end of the U-shaped elbow 1 is communicated with an outer cylinder 8, a guide plate 2 is fixedly connected to an inside of the U-shaped elbow 1, and functions to redistribute tail gas coming in from the inlet of the U-shaped elbow 1, and divide the tail gas into two parts, so as to prevent the gas from totally rushing to one side due to inertia, and achieve an effect of fully utilizing space by a reasonable design structure, a cyclone barrel 3 is disposed inside one end of the outer cylinder 8, a urea injector 11 is disposed at an end of an outer side surface of the outer cylinder 8 corresponding to the cyclone barrel 3, a positioning ring 15 is connected to an inside lower end of the cyclone barrel 3, a plurality of cyclone blades 4 are disposed on an inner wall of the positioning ring 15, a turbulence chamber 5 is welded at a bottom end of the cyclone barrel 3 inside the outer cylinder 8, the outer side surface of the rotational flow barrel 3 is positioned above the turbulent flow bin 5 and welded with a blocking baffle 6, the other end of the outer barrel 8 is provided with an exhaust outlet 9, a porous plate 7 is arranged on one side of the inner part of the outer barrel 8 close to the turbulent flow bin 5, a plurality of air holes are distributed on the surface of the porous plate 7, the porous plate 7 is of a circular structure, the outer diameter of the porous plate 7 is matched with the inner diameter of the outer barrel 8, the porous plate 7 is fixedly connected with the outer barrel 8, and one end of the outer barrel 8 is in through connection with the air outlet end of the U-shaped elbow 1;

u type elbow 1 includes inlayer 12 and skin 13, and inlayer 12 and skin 13 are corrosion resistant plate, and oxidation catalyst converter and particulate trap are installed to U type elbow 1's front end, and SCR blender and SCR catalyst converter are installed to the rear end, adopt double-deck corrosion resistant plate with U type elbow 1, can reduce U type elbow 1's heat dissipation, promote the heat preservation effect.

One end of the blocking baffle 6 is connected with a connecting plate 61, the middle part of the blocking baffle 6 is positioned on the outer side surface of the cyclone barrel 3 and is provided with a clamping groove 63, the outer side surface of the lower end of the blocking baffle 6 is distributed with a plurality of small holes 62, the upper end of the blocking baffle 6 and the inner side wall of the U-shaped elbow 1 are welded and fixed through the connecting plate 61, the lower end of the blocking baffle 6 is clamped on the outer side surface of the cyclone barrel 3 through the clamping groove 63 and is welded and fixed, the blocking baffle 6 has the function of blocking air flow, so that most of tail gas flows through the cyclone barrel 3, a certain distance is kept between the area of the upper side of the blocking baffle 6 close to the blades of the cyclone barrel 3 and the cyclone barrel 3, and the holes at the position of the outer side surface of the upper end of the cyclone barrel 3 corresponding to the guide vanes 31 (the holes are arranged at the positions of the outer, not only can reduce the flow resistance of the blocking baffle 6, but also can reduce the flow dead zone on the leeward side of the blocking baffle 6, and reduce the crystallization risk.

The upper end of the turbulence bin 5 is welded and fixed with the lower surface of the rotational flow barrel 3, the lower end of the turbulence bin 5 is welded and fixed with the inner side wall of the outer barrel 8, a plurality of windward holes 53 are distributed at the position, corresponding to the air outlet of the U-shaped elbow 1, of the side surface of one end of the turbulence bin 5, a windward groove 52 is arranged below the windward holes 53, a diversion groove 51 is arranged between the position, below the windward groove 52, of one end of the turbulence bin 5 and the inner side wall of the outer barrel 8, a plurality of air outlet holes 54 are distributed at the position, corresponding to the perforated plate 7, of the side surface of the other end of the turbulence bin 5, the arrangement of the turbulence bin 5 is used for promoting further mixing of urea spray passing through the rotational flow blades 4 and tail gas, and meanwhile, urea liquid drops are prevented from directly impacting the cold wall surface of the outer barrel 8 of the mixer, and the urea crystallization risk is reduced; the windward side surface of the burbling bin 5 is provided with windward holes 53, which have the functions of reducing the resistance of the mixer on the one hand, and on the other hand, the direction of the air flow flowing in through the windward holes 53 is almost vertical to the urea spraying direction, so that the air disturbance can be enhanced, the atomization of the urea spraying and the mixing with the tail gas are promoted, the windward tank 52 is similar to the windward holes 53 in function, so that the gas flow speed near the drop point of the urea can be enhanced, the wall surface flow dead zone can effectively reduce the crystallization risk, the arrangement of the diversion channel 51 can not only play a role of diversion and reduce the flow resistance of the mixer, but also can heat the bottom of the burbling bin 5 by utilizing the exhaust heat, so that the effect of quickly increasing the temperature is achieved, the positive effect of reducing the generation of crystals is achieved, and the other side surface of the burbling bin 5 corresponds to the plurality of air outlet holes 54 arranged at the outlet, so that the flow resistance is reduced on the one hand, and the redistribution of the exhaust flow rate can be achieved, through the optimal design, the flow velocity in the cross section behind the turbulent flow bin 5 and the ammonia generated by the decomposition of urea are distributed more uniformly.

The outer side surface of the outer barrel 8 is provided with a mounting seat 14 at the bottom end of the urea injector 11, and the mounting seat 14 is fixed on the upper surface of the outer barrel 8 through bolts, so that the urea injector 11 is convenient to mount and fix; the urceolus 8 is double-deck tubular construction, is for the inside temperature fast of blender after better heat preservation and cold start, and in addition, the outside of urceolus 8 also can wrap up the heat preservation cotton, guarantees that the SCR catalyst converter normally works.

Urea sprayer 11 is coaxial setting with whirl bucket 3, the upper end of whirl bucket 3 is circular cutting has the water conservancy diversion leaf 31 of a plurality of incurving, its effect is to form the vortex through the air current conversion that guide plate 2 came, strengthen the mixing of the urea solution of injection and tail gas, through the cooperation with guide plate 2, make the air input of each blade entry as far as possible even, reach the purpose that reduces the flow resistance, and simultaneously, because each blade entry flow is even, can make the urea spraying maintain in whirl bucket 3 middle parts, avoid the air current to blow the urea spraying partially, and the top welding of whirl bucket 3 is located the one end department of urea sprayer 11 at the upper surface of urceolus 8, and the other end side of whirl bucket 3 and guide plate 2 welded fastening.

The swirl vane 4 is including installing in the a plurality of upper blade 41 that is circular distribution in holding ring 15 inner wall upper end, the inner wall of holding ring 15 is located the below of upper blade 41 and is circular distribution and has a plurality of lower blade 42, upper blade 41 is the same with lower blade 42's quantity, and upper blade 41 staggers each other with lower blade 42 in the position of holding ring 15 inner wall, can strengthen the air disturbance effect, upper blade 41 is the distortion form with lower blade 42, in order to reduce the central part blade and concentrate and the flow resistance who produces, and upper blade 41 and lower blade 42 all with the inner wall welded fastening of holding ring 15, swirl vane 4 is fixed mutually through holding ring 15 with swirl bucket 3, and the radial dimension of holding ring 15 is the same with swirl bucket 3, make things convenient for the fixed and the installation of swirl bucket 3 and swirl vane 4.

The utility model discloses a theory of operation is: the SCR mixer structure of the utility model is beneficial to rapid temperature increase under the cold start condition, after the urea injection condition is satisfied, gas enters the U-shaped elbow 1 through the exhaust inlet 10, is guided by the guide plate 2, the tail gas is divided into two parts, the gas is prevented from completely rushing to one side due to inertia, then the urea is sprayed out by the urea sprayer 11, the gas is rapidly mixed with the tail gas rotating at high speed in the cyclone barrel 3, the urea is accelerated to evaporate and decompose, when the gas passes through the cyclone blades 4, the tail gas turbulence is further strengthened and is secondarily mixed with the broken liquid drops after hitting the cyclone blades 4, when the gas flows through the turbulence bin 5, the mixed gas is mixed with the high-temperature tail gas flowing in the vertical direction from the side surface again, and the high-temperature tail gas flowing in the windward side of the turbulence bin 5 rapidly sweeps away the urea turbulence possibly generated in the bin 5, the crystallization risk is reduced, and then the adjustment function of the turbulence bin 5 and the perforated plate 7 is passed through, improve air velocity and ammonia distribution uniformity before the SCR catalyst, reduce the average flow speed, help improving SCR conversion efficiency, from this it is visible, the utility model is not only compact structure, do not influence arranging of the original urea injection system of whole car and aftertreatment in addition, SCR blender when overall structure design helps cold start carries the temperature fast and keeps warm with the normal during operation, has eliminated the dead zone that flows, has avoided the crystallization that the urea liquid drop is detained and the evaporation causes, and the utility model discloses under the condition that does not increase the flow resistance, strengthened the mixture of urea with tail gas, improved the air velocity uniformity and the ammonia distribution uniformity of SCR catalyst front end, help promoting SCR conversion efficiency.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The vehicle aftertreatment SCR mixer comprises a U-shaped elbow (1) and is characterized in that an exhaust inlet (10) is connected to the lower surface of one end of the U-shaped elbow (1), the other end of the U-shaped elbow (1) is communicated with an outer barrel (8), a guide plate (2) is fixedly connected inside the U-shaped elbow (1), a swirl barrel (3) is arranged on the inner side of one end of the outer barrel (8), a urea injector (11) is arranged at one end, corresponding to the swirl barrel (3), of the outer side surface of the outer barrel (8), a positioning ring (15) is connected to the inner side of the lower end of the swirl barrel (3), a plurality of swirl blades (4) are distributed on the inner wall of the positioning ring (15), a turbulence bin (5) is welded at the position, located at the bottom end of the swirl barrel (3), of the outer side surface of the swirl barrel (3), a blocking partition plate (6) is welded above the turbulence bin (5), the other end of urceolus (8) is provided with exhaust outlet (9), and the inside of urceolus (8) is close to one side in vortex storehouse (5) and is provided with perforated plate (7).

2. The vehicle aftertreatment SCR mixer according to claim 1, wherein the U-shaped elbow (1) comprises an inner layer (12) and an outer layer (13), the inner layer (12) and the outer layer (13) are stainless steel plates, one end of the blocking baffle (6) is connected with a connecting plate (61), the middle of the blocking baffle (6) is located on the outer side surface of the cyclone barrel (3) and is provided with a clamping groove (63), a plurality of small holes (62) are distributed on the outer side surface of the lower end of the blocking baffle (6), the upper end of the blocking baffle (6) and the inner side wall of the U-shaped elbow (1) are welded and fixed through the connecting plate (61), and the lower end of the blocking baffle (6) is clamped on the outer side surface of the cyclone barrel (3) through the clamping groove (63) and is welded and fixed.

3. The vehicle aftertreatment SCR mixer of claim 1, wherein the upper end of the turbulent flow bin (5) is welded and fixed to the lower surface of the rotational flow barrel (3), the lower end of the turbulent flow bin (5) is welded and fixed to the inner side wall of the outer barrel (8), a plurality of windward holes (53) are distributed at the air outlet position of the side face of one end of the turbulent flow bin (5) corresponding to the U-shaped elbow (1), a windward groove (52) is arranged below the windward holes (53), a diversion groove (51) is arranged between the lower part of the windward groove (52) and the inner side wall of the outer barrel (8) at one end of the turbulent flow bin (5), and a plurality of air outlet holes (54) are distributed at the position of the side face of the other end of the turbulent flow bin (5) corresponding to the porous plate (7).

4. The vehicle aftertreatment SCR mixer of claim 1, wherein the outer side surface of the outer cylinder (8) is provided with a mounting seat (14) at the bottom end of the urea injector (11), the mounting seat (14) is fixed on the upper surface of the outer cylinder (8) through bolts, and the urea injector (11) and the swirl barrel (3) are coaxially arranged.

5. The vehicle aftertreatment SCR mixer of claim 1, wherein the upper end of the cyclone barrel (3) is cut in a circular shape with a plurality of inwardly bent guide vanes (31), the top end of the cyclone barrel (3) is welded on the upper surface of the outer barrel (8) at one end of the urea injector (11), and the other end side of the cyclone barrel (3) is welded and fixed with the guide plate (2).

6. The vehicle aftertreatment SCR mixer of claim 1, wherein the swirl vane (4) comprises a plurality of upper vanes (41) which are arranged on the upper end of the inner wall of the positioning ring (15) and are distributed in a circular manner, the inner wall of the positioning ring (15) is arranged below the upper vanes (41) and is distributed in a circular manner with a plurality of lower vanes (42), the upper vanes (41) and the lower vanes (42) are same in number, the upper vanes (41) and the lower vanes (42) are staggered with respect to each other in the inner wall of the positioning ring (15), the upper vanes (41) and the lower vanes (42) are twisted, the upper vanes (41) and the lower vanes (42) are welded and fixed with the inner wall of the positioning ring (15), and the swirl vane (4) and the swirl barrel (3) are fixed by the positioning ring (15).

7. The SCR mixer of claim 1, wherein the perforated plate (7) has a plurality of air holes distributed on the surface thereof, the perforated plate (7) has a circular structure, the outer diameter of the perforated plate (7) is adapted to the inner diameter of the outer barrel (8), and the perforated plate (7) is fixedly connected to the outer barrel (8).

8. The vehicle aftertreatment SCR mixer of claim 1, wherein one end of the outer cylinder (8) is connected to the air outlet end of the U-shaped elbow (1) in a through manner, and the outer cylinder (8) has a double-layer tube structure.