CN210134991U - Urea mixer and vehicle - Google Patents
Urea mixer and vehicle Download PDFInfo
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- CN210134991U CN210134991U CN201920402329.9U CN201920402329U CN210134991U CN 210134991 U CN210134991 U CN 210134991U CN 201920402329 U CN201920402329 U CN 201920402329U CN 210134991 U CN210134991 U CN 210134991U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The urea mixer that this scheme provided, the air current gets into mixing mechanism back from the entry of mixing the outer tube, forms strong rotatory air current under swirler's spinning disk effect earlier, breaks up nozzle spun urea solution and drives the rotatory anteclass of urea, gets into the toper porous tube afterwards, and urea solution can pass the toper porous tube at this in-process, carries out breakage, mixes, decomposes, makes urea solutionThe mixed gas is fully and uniformly mixed with the exhaust gas of the engine, and then is further decomposed and fully atomized under the drive of the gas flow, and the SCR conversion efficiency is improved to a certain extent. In the high-efficiency SCR route, the full mixing and crushing capacity of the urea solution and the exhaust gas can be improved to the maximum extent, and NH is improved3Uniformity of (d) is improved. The scheme also provides a vehicle with the urea mixer.
Description
The applicant claims priority of chinese patent application having application number 201821623633.8 entitled "a catalytic reaction assembly and aftertreatment system" filed on 2018, 09/30.8, the entire contents of which are incorporated herein by reference and hereby claimed.
Technical Field
The utility model relates to the technical field of vehicles, especially, relate to a urea mixer and vehicle.
Background
The injected urea solution cannot be converted into NH in real time due to poor atomization, uneven mixing or insufficient decomposition of urea3But rather, byproducts are formed, urea precipitates are formed, and the reduction reaction is unstable, thereby affecting the stability of NOx emissions and conversion efficiency. Because the mass of urea liquid drops is much larger than that of gas, crystals formed in a gas flow stagnation area are remained and grow continuously by taking the urea liquid drops as cores if the urea liquid drops cannot be completely decomposed in time, and finally the urea crystals are formedCalculus and the exhaust back pressure of the engine gradually rise, so that the engine cannot continue to normally run.
Therefore, how to improve the full mixing and crushing capacity of the urea solution and the exhaust gas and improve NH3The uniformity of the method is a difficult problem to be solved in the field at the present stage.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a urea mixer has promoted urea solution and carminative intensive mixing and crushing ability, has improved NH3Uniformity of (d) is improved. Furthermore, the utility model also provides a vehicle of having above-mentioned urea mixer.
In order to achieve the above object, the utility model provides a following technical scheme:
a urea mixer comprises a mixing mechanism and a mixing outer pipe arranged outside the mixing mechanism in a covering mode, wherein the mixing mechanism comprises a rotational flow device and a conical perforated pipe which are connected with each other.
Preferably, in the urea mixer, the swirling device includes a plate-type swirling tube, and a tube wall of the plate-type swirling tube is provided with a plurality of swirling plates arranged in the circumferential direction.
Preferably, in the urea mixer, the swirling device further includes a perforated pipe disposed at a front end of the plate-type swirling pipe.
Preferably, in the urea mixer, the mixing mechanism further includes a support plate for connecting the swirling device and the conical perforated pipe, and the support plate is connected to the mixing outer pipe.
Preferably, in the urea mixer, the supporting plate is provided with a ring groove.
Preferably, in the urea mixer, the support plate is an annular plate, and an outer edge of the annular plate is connected to the mixing outer tube.
Preferably, in the urea mixer, the mixing mechanism further includes a mixing blade disposed at a rear end of the tapered perforated pipe.
Preferably, in the urea mixer described above, the mixing blades are plural in number.
Preferably, in the urea mixer, the mixing blades are uniformly arranged on the inner wall of the mixing outer pipe.
A vehicle comprising a urea mixer, wherein the urea mixer is any one of the urea mixers described above.
According to the technical scheme, after the air flow enters the mixing mechanism from the inlet of the mixing outer pipe, the air flow forms strong rotary air flow under the action of the spinning disk of the spinning device, the urea solution sprayed out of the nozzle is scattered and drives the urea to rotate and flow forward, and then the urea solution enters the conical porous pipe. In the high-efficiency SCR route, the full mixing and crushing capacity of the urea solution and the exhaust gas can be improved to the maximum extent, and NH is improved3Uniformity of (d) is improved. The scheme also provides a vehicle with the urea mixer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings required to be used in the description of the embodiments or the background art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a urea mixer provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a swirling device provided in an embodiment of the present invention.
In the figure:
1. mixing the outer tube; 2. a swirling device; 201. a plate swirl tube; 202. a perforated pipe; 3. a tapered perforated pipe; 4, a support plate; 5. mixing the blades.
Detailed Description
The core of the utility model is to provide a urea mixer, promoted urea solution and carminative intensive mixing and crushing capacity, improved NH3Uniformity of (d) is improved. Furthermore, another core of the present invention is to provide a vehicle having the above urea mixer.
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.
As shown in figure 1, the utility model discloses a urea mixer, including mixing mechanism and the mixing tube 1 that the cover was located the mixing mechanism outside, mixing mechanism includes interconnect's whirl device 2 and toper perforated pipe 3.
The cyclone device 2 is used for forming strong rotating airflow through the gas inside the cyclone device, and the conical porous pipe 3 is a conical pipe provided with a plurality of through holes and used for crushing, mixing and decomposing the solution passing through the conical pipe. The conical design can improve the flow speed of the tail gas of the engine on one hand, and the porous structure can promote the mixing of the urea and the tail gas on the other hand.
The urea mixer that this scheme provided, the air current gets into the mixing mechanism back from the entry of mixing outer tube 1, form strong rotatory air current under the spinning disk effect of whirl device 2 earlier, break up nozzle spun urea solution and drive the rotatory antegrade of urea, get into toper porous tube 3 afterwards, urea solution can pass toper porous tube 3 at this in-process, carry out the breakage, mix, decompose, make urea solution and engine exhaust carry out abundant homogeneous mixing, then further decompose and abundant atomizing under the drive of air current, and improve SCR conversion efficiency to a certain extent. In the high-efficiency SCR route, the full mixing and crushing capacity of the urea solution and the exhaust gas can be improved to the maximum extent, and NH is improved3The uniformity, urea evaporation rate and mixing uniformity of the urea are fully evaporated and heatedThe effect of the solution.
In a specific embodiment, the swirling device 2 includes a plate-type swirling tube 201, and a tube wall of the plate-type swirling tube 201 is a plurality of swirling plates circumferentially arranged. After the air current gets into whirl device 2, through the effect of slice formula whirl pipe 201, form strong rotatory air current, the urea solution of injection is driven by strong rotatory air current.
In a further embodiment, the swirling device 2 further comprises a perforated tube 202 disposed at the front end of the plate swirl tube 201. The perforated pipe 202 is a straight pipe with a plurality of through holes. The strong disturbance action is generated in the mixing outer tube 1 by the airflow of the perforated tube 202 and the main airflow, so that the urea aqueous solution and the exhaust gas can be fully mixed and crushed, and the effects of full evaporation and pyrolysis are achieved.
In order to better fix the swirling device 2 and the conical perforated pipe 3 in the mixing outer pipe 1, the mixing mechanism further comprises a support plate 4 for connecting the swirling device 2 and the conical perforated pipe 3, and the support plate 4 is connected with the mixing outer pipe 1.
The backup pad plays the support fixed action to whirl device 2 and toper perforated pipe 3, mixes outer tube 1 fluting in backup pad department, from mixing outer tube outside welding backup pad, improves urea mixer's mechanical strength.
According to the actual requirement, the support plate 4 can be designed as an annular plate, the outer edge of which is connected to the mixing outer tube 1.
In the preferred embodiment, the support plate 4 is provided with a ring groove. The air current can effectively avoid the flowing dead zone that the mainstream air mixture formed after reaching the supporting plate 4 through the annular groove, and the crystallization that the urea liquid drop gravity sinks and produces has been avoided.
In a particular embodiment, the mixing mechanism further comprises a mixing blade 5 arranged at the rear end of the conical perforated tube 3. The mixing outer pipe 1 is grooved at the mixing blades 5, and the mixing blades 5 are welded from the outer side of the mixing outer pipe, so that the mechanical strength of the urea mixer is improved.
Specifically, the number of the mixing blades 5 is plural. A plurality of mixing blades 5 are uniformly arranged on the inner wall of the mixing outer tube 1.
The air current carries urea solution to flow through mixing blade 5, carries out the secondary and strengthens rotatory gas velocity of flow, increases the mixing of urea solution and air current, atomizes, and mixing blade further improves tail gas flow velocity, prevents that urea solution from to the internal face of urea mixing outer tube 1 on, causing and piling up the crystallization.
By adopting the structure, the actual mixing process of the urea is as follows: after the air current enters the mixing mechanism from the inlet of the mixing outer tube 1, a strong rotary air current is formed under the action of the spinning disk of the spinning device 2, the urea solution sprayed out of the nozzle is scattered and drives the urea to rotate to flow forward, and then the urea solution enters the conical porous tube 3, and in the process, the urea solution can pass through the conical porous tube 3 to be crushed, mixed and decomposed, then the air current drives the urea solution to flow through the mixing blades 5, the secondary enhanced rotary air flow speed is carried out, the mixing and atomization of the urea solution and the air current are enhanced, the urea solution is prevented from reaching the inner wall surface of the urea mixing outer tube 1, and accumulation and crystallization are caused, meanwhile, the strong disturbance effect is generated in the mixing outer tube 1 by the air current and the main air current through the porous tube 202, the sufficient mixing and crushing of the urea solution and exhaust can be improved.
The scheme comprehensively considers the crushing of the cyclone device 2, the conical perforated pipe 3 and the mixing blade 5 on the urea liquid drops and the mixing effect of the air flow, creatively combines three structural devices, furthest exerts the advantages of each structure in the urea solution decomposition and atomization process, and ensures that the urea solution is crushed and decomposed to the maximum extent, so that the decomposed NH is decomposed3The urea uniformly enters the front end face of the SCR carrier, the SCR conversion efficiency is improved, and the risk of urea crystallization is reduced.
In addition, the application also discloses a vehicle, which comprises a urea mixer, wherein the urea mixer is the urea mixer disclosed in the above embodiment, and therefore, the vehicle with the urea mixer also has all the technical effects described above, and the details are not repeated herein.
The urea nozzle and the nozzle holder are disposed at the front end of the urea mixer and are mounted together on the aftertreatment package.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The urea mixer is characterized by comprising a mixing mechanism and a mixing outer pipe (1) covered outside the mixing mechanism, wherein the mixing mechanism comprises a cyclone device (2) and a conical perforated pipe (3) which are connected with each other.
2. Urea mixer according to claim 1, characterized in that the swirl device (2) comprises a plate swirl tube (201), the wall of the plate swirl tube (201) being a plurality of circumferentially arranged swirl plates.
3. Urea mixer according to claim 2, characterized in that the swirl device (2) further comprises a perforated tube (202) arranged at the front end of the plate swirl tube (201).
4. Urea mixer according to claim 1, characterized in that the mixing means further comprise a support plate (4) for connecting the swirling device (2) and the conical perforated tube (3), the support plate (4) being connected with the mixing outer tube (1).
5. Urea mixer according to claim 4, characterized in that the support plate (4) is provided with a ring groove.
6. Urea mixer according to claim 4, characterized in that the support plate (4) is an annular plate, the outer edge of which is connected to the mixing outer tube (1).
7. Urea mixer according to claim 1, characterized in that the mixing means further comprise a mixing blade (5) arranged at the rear end of the conical perforated tube (3).
8. Urea mixer according to claim 7, characterized in that the number of mixing blades (5) is multiple.
9. Urea mixer according to claim 8, characterized in that a number of mixing blades (5) are evenly arranged on the inner wall of the mixing outer tube (1).
10. A vehicle comprising a urea mixer, characterized in that the urea mixer is a urea mixer according to any one of claims 1-9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018216236338 | 2018-09-30 | ||
| CN201821623633 | 2018-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210134991U true CN210134991U (en) | 2020-03-10 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920402392.2U Active CN209761535U (en) | 2018-09-30 | 2019-03-27 | Catalytic reaction assembly and aftertreatment system |
| CN201920402329.9U Active CN210134991U (en) | 2018-09-30 | 2019-03-27 | Urea mixer and vehicle |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920402392.2U Active CN209761535U (en) | 2018-09-30 | 2019-03-27 | Catalytic reaction assembly and aftertreatment system |
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| CN (2) | CN209761535U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627951A (en) * | 2020-12-24 | 2021-04-09 | 北京理工大学 | SCR rotational flow mixing tube |
| CN113187591A (en) * | 2021-06-16 | 2021-07-30 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
-
2019
- 2019-03-27 CN CN201920402392.2U patent/CN209761535U/en active Active
- 2019-03-27 CN CN201920402329.9U patent/CN210134991U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627951A (en) * | 2020-12-24 | 2021-04-09 | 北京理工大学 | SCR rotational flow mixing tube |
| CN113187591A (en) * | 2021-06-16 | 2021-07-30 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
| CN113187591B (en) * | 2021-06-16 | 2022-08-23 | 一汽解放汽车有限公司 | Variable mixer of engine SCR (Selective catalytic reduction) postprocessor and control method thereof |
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| Publication number | Publication date |
|---|---|
| CN209761535U (en) | 2019-12-10 |
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