CN212318126U - Spiral slice type urea mixing device - Google Patents
Spiral slice type urea mixing device Download PDFInfo
- Publication number
- CN212318126U CN212318126U CN202021157271.5U CN202021157271U CN212318126U CN 212318126 U CN212318126 U CN 212318126U CN 202021157271 U CN202021157271 U CN 202021157271U CN 212318126 U CN212318126 U CN 212318126U
- Authority
- CN
- China
- Prior art keywords
- urea
- spiral
- pipe
- plate
- partition plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model relates to the technical field of diesel engine tail gas after-treatment, in particular to a spiral-plate urea mixing device, which comprises an air inlet component, a cylinder body, a front end cover and a nozzle base, the urea spraying device comprises a urea nozzle, a rotational flow component and a supporting plate, wherein the rotational flow component is arranged in a barrel, the front end of the rotational flow component is welded with a front end cover, the rear end of the rotational flow component is connected with the supporting plate, the outer side of the supporting plate is welded on the barrel, a nozzle base for installing the urea nozzle is welded at a hole at the front end of the front end cover, an air inlet component for connecting an air inlet pipe is welded at the hole of the barrel, the rotational flow component comprises a mixing cavity partition plate, a spiral sheet, a hole pipe and an expansion pipe, one end of the expansion pipe is welded on the mixing cavity partition plate and sleeved with the hole pipe, the spiral sheet is sleeved at the front end of the hole pipe and welded on the mixing cavity partition plate, a notch; the utility model discloses can realize the breakage and the decomposition of urea, reduce the crystallization of urea, promote the decomposition rate of urea.
Description
Technical Field
The utility model relates to a diesel engine tail gas aftertreatment technical field, more specifically relates to a flight formula urea mixing arrangement.
Background
Traditional SCR catalyst converter passes through the connecting seat with the urea nozzle and settles on the blast pipe, and is great to arranging the space demand, and to the different chassis of the same engine, the condition in different arrangement spaces will lead to urea to spray the position and change, and urea spraying performance also changes to lead to needing to mark again.
Meanwhile, the integration of the urea nozzle on the SCR catalyst is required by many customers, and the integration nozzle is difficult to arrange and insufficient in urea atomization space, which easily causes the urea liquid drop to be directly injected onto the EGP wall surface, thereby causing a serious urea crystallization problem.
Disclosure of Invention
The utility model provides a spiral piece formula urea mixing arrangement to the integrated nozzle who exists leads to the urea liquid drop directly to spray to the EGP wall easily owing to arrange difficulty, urea atomizing space not enough among the solution prior art, and produces serious urea crystallization problem.
As a first aspect of the present invention, a spiral-plate urea mixing device is provided, including an air inlet assembly, a cylinder, a front end cap, a nozzle base, a urea nozzle, a cyclone assembly and a support plate, wherein the cyclone assembly is disposed in the cylinder, the front end of the cyclone assembly is connected to the front end cap, the rear end of the cyclone assembly is connected to the support plate, the support plate is connected to the cylinder, a nozzle base for installing the urea nozzle is connected to a front end opening of the front end cap, and an air inlet assembly for connecting an air inlet pipe is connected to an opening of the cylinder 2; the cyclone assembly comprises a mixing cavity partition plate, a spiral sheet, a hole pipe and an expansion pipe, wherein an air outlet is formed in one end of the mixing cavity partition plate, one end of the expansion pipe is connected to the air outlet at one end of the mixing cavity partition plate and sleeved with the hole pipe, the other end of the expansion pipe is connected to a supporting plate, and the spiral sheet is sleeved at the front end of the hole pipe and welded on the mixing cavity partition plate; the side of the mixing chamber partition board is provided with a notch, the spiral piece comprises an extension end and an arc end, the extension end is connected with one end of the notch, and the arc end is enclosed at the outer side of the hole pipe and connected with an air outlet on the mixing chamber partition board through a bottom flanging of the hole pipe so as to form an annular air flow channel in the mixing chamber partition board.
Further, the radial clearance between the hole pipe and the expansion pipe is 6-13 mm.
Furthermore, the support legs at the two ends of the hole pipe are respectively connected to the spiral sheet and the expansion pipe.
Furthermore, two support legs are respectively arranged at the front end and the rear end of the hole pipe.
Further, the cyclone assembly and the support plate form a first mixing chamber in the cylinder, and the cyclone assembly and the front end cover form a second mixing chamber in the cylinder.
Further, the extending ends of the spiral sheets are sealed, and the arc ends of the spiral sheets are opened.
Furthermore, the front end of the hole pipe is provided with a plurality of big holes, and the rear end of the hole pipe is provided with a plurality of small holes.
Furthermore, the aperture of the large hole is 6-10 mm, and the aperture of the small hole is 4-6 mm.
The utility model provides a spiral piece formula urea mixing arrangement has following advantage:
1) the spiral-plate-selecting mixer structure is adopted, urea is mixed by utilizing rotating airflow, the urea is prevented from sticking on the wall of the pipe wall too early, and the urea sticking points are different along with the change of the flow speed under different working conditions, so that the urea is prevented from sticking on the wall at the same position all the time to generate crystallization;
2) the spiral piece structure is adopted to generate rotary airflow, so that the urea blowing device can play a role in blowing and sweeping the urea, and can quickly take away the urea in the mixing cavity;
3) the urea is divided and mixed by adopting a pore pipe with a big pore at the upper end and a small pore at the lower end, the small pore has better crushing effect on the urea, and the urea can be divided into an inner part and an outer part of the pore pipe; the large hole at the upper end can guide airflow into the hole pipe without generating large back pressure; meanwhile, the strong rotational flow formed in the gap between the hole pipe and the mixing pipe can also quickly take away the urea, so that the accumulation of the urea on the pipe wall is prevented;
4) the rear end of the mixer is expanded by adopting a taper pipe, the rotating urea diffuses to the periphery under the action of centrifugal force, the expansion of the taper pipe enhances the diffusion effect, and the mixing effect of air flow is improved;
5) the spiral mixer improves the uniformity of gas flow mixing and ammonia distribution on the end face of the SCR carrier.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is an external structural schematic diagram of the spiral-piece urea mixing device of the present invention.
Fig. 2 is the internal structure schematic diagram of the spiral piece type urea mixing device of the present invention.
Fig. 3 is an exploded view of the spiral piece type urea mixing device of the present invention.
Fig. 4 is a schematic view of a cyclone assembly of the spiral-vane urea mixing device of the present invention.
Fig. 5 is an exploded view of the spiral flow component of the spiral-vane urea mixing device of the present invention.
Description of reference numerals: 1-an air intake assembly; 2, a cylinder body; 3-front end cover; 4-nozzle base; 5-urea nozzle; 6, a rotational flow component; 6-1-mixing chamber partition; 6-2-flight; 6-3-hole tube; 6-4-expanding the tube; 7-support plate.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the specific embodiments, structures, features and effects of the spiral-plate urea mixing device according to the present invention with reference to the accompanying drawings and preferred embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the present embodiment, a spiral-plate urea mixing device is provided, as shown in fig. 1-3, including an air intake assembly 1, a cylinder 2, a front end cover 3, a nozzle base 4, a urea nozzle 5, a cyclone assembly 6, and a support plate 7, where the cyclone assembly 6 is disposed in the cylinder 2, the front end of the cyclone assembly 6 is welded to the front end cover 3, the rear end of the cyclone assembly 6 is fixedly connected to the support plate 7, the outer side of the support plate 7 is welded to the cylinder 2, the nozzle base 4 for installing the urea nozzle 5 is welded to an opening at the front end of the front end cover 3, and the air intake assembly 1 for connecting an air intake pipe is welded to an opening of the cylinder 2; as shown in fig. 4-5, the swirling flow component 6 includes a mixing chamber partition plate 6-1, a spiral plate 6-2, a perforated pipe 6-3 and an expansion pipe 6-4, wherein one end of the mixing chamber partition plate 6-1 is provided with an air outlet, one end of the expansion pipe 6-4 is welded at the air outlet of one end of the mixing chamber partition plate 6-1 and sleeved with the perforated pipe 6-3, the other end of the expansion pipe 6-4 is welded on a support plate 7, and the spiral plate 6-2 is sleeved at the front end of the perforated pipe 6-3 and welded on the mixing chamber partition plate 6-1; the side surface of the mixing cavity partition plate 6-1 is provided with a notch, the spiral sheet 6-2 comprises an extension end and an arc end, the extension end is welded and fixed with one end of the notch, and the arc end surrounds the outer side of the hole pipe 6-3 and is welded at an air outlet on the mixing cavity partition plate 6-1 through a bottom flanging of the arc end so as to form an annular air flow channel in the mixing cavity partition plate 6-1.
Preferably, the radial gap between the perforated tube 6-3 and the expansion tube 6-4 is 6mm, through which part of the gas flow passes.
Preferably, the support legs at the two ends of the perforated pipe 6-3 are respectively welded on the spiral sheet 6-2 and the expansion pipe 6-4 to play a role in fixing.
Preferably, the front end and the rear end of the perforated pipe 6-3 are respectively provided with two support legs.
Preferably, the cyclone assembly 6 and the support plate 7 form a first mixing chamber in the cylinder 2, and the cyclone assembly 6 and the front end cover 3 form a second mixing chamber in the cylinder 2.
Preferably, the extended ends of the spiral sheet 6-2 are sealed, and the circular arc ends thereof are opened.
Preferably, the front end of the perforated pipe 6-3 is provided with a plurality of big holes, and the rear end thereof is provided with a plurality of small holes.
Preferably, the aperture of the large hole is 6-10 mm, and the aperture of the small hole is 4-6 mm.
The working process of the utility model is as follows:
as shown in fig. 2, when engine exhaust enters the device of the present invention through the air intake assembly 1, the engine exhaust firstly enters a first chamber formed between the cyclone assembly 6, the support plate 7 and the cylinder 2, and enters a second mixing chamber formed between the cyclone assembly 6 and the front end cover 3 through a gap on the mixing chamber partition plate 6-1; the spiral piece 6-2 is welded on the mixing cavity partition plate 6-1, the spiral piece 6-2 is arranged around the air outlet hole on the mixing cavity partition plate 6-1, one end of the spiral piece is sealed, the other end of the spiral piece is opened, the air flow flows around the spiral piece 6-2 in the mixing cavity II to form strong rotating air flow, the rotating air flow enters a gap between the hole pipe 6-3 and the expansion pipe 6-4 through the opened end on the other side of the spiral piece 6-2, and a part of the air flow enters the inside of the hole pipe 6-3 through the opening hole on the hole pipe 6-3; the front end of the perforated pipe 6-3 is provided with a large hole with the diameter of 6-10 mm, and the rear end is provided with a small hole with the diameter of 4-6 mm, so that not only can the rotary airflow be ensured not to generate large pressure loss when entering from the large hole at the front end of the perforated pipe 6-3, but also a part of rotary airflow is ensured to flow between the perforated pipe 6-3 and the expansion pipe 6-4;
the urea is continuously sprayed into the pore pipe 6-3 by the urea nozzle 5 arranged on the spraying group base 4 while the urea is distributed by the pore pipe 6-3, and the sprayed urea generally forms a cone angle (determined according to the characteristics of a spraying system) of 17-26 degrees when the urea is sprayed, so that the sprayed urea collides the wall of a small pore section at the rear end of the pore pipe 6-3 and is decomposed; when the exhaust flow is large, the urea is greatly influenced by the rotating airflow and is close to the wall collision position; when the exhaust flow is small, the urea is less influenced by the rotating airflow and the wall collision position is close to the front. Therefore, the urea is influenced differently by the rotating airflow, the wall collision position of the urea is changed, and the risk of accumulation of the urea at the same position is reduced; meanwhile, after the urea hits the wall of the hole pipe 6-3, one part of the urea enters the gap between the hole pipe 6-3 and the expansion pipe 6-4, and the other part of the urea is left in the hole pipe 6-3, so that urea is shunted, and the possibility of urea accumulation is further reduced;
urea in the gap between the hole pipe 6-3 and the expansion pipe 6-4 and urea in the hole pipe 6-3 are finally diffused to the whole cylinder body 2 through the bell mouth at the rear end of the expansion pipe 6-4, so that the uniformity of the air flow distribution and the uniformity of the urea distribution on the end face of the catalyst are ensured.
The utility model provides a spiral slice formula urea mixing arrangement adopts and selects spiral slice formula blender structure, utilizes rotatory air current mixed urea, prevents that urea from landing on the wall too early, and along with the change of the velocity of flow under the different work condition, urea landing point is different, has prevented that urea from landing on the wall and producing the crystallization in the same position all the time; the spiral piece structure is adopted to generate rotary airflow, so that the urea blowing device can play a role in blowing and sweeping the urea, and can quickly take away the urea in the mixing cavity; the urea is divided and mixed by adopting a pore pipe with a big pore at the upper end and a small pore at the lower end, the small pore has better crushing effect on the urea, and the urea can be divided into an inner part and an outer part of the pore pipe; the large upper end holes can guide airflow into the hole pipes without generating large back pressure. Meanwhile, the strong rotational flow formed in the gap between the hole pipe and the mixing pipe can also quickly take away the urea, so that the accumulation of the urea on the pipe wall is prevented; the rear end of the mixer is expanded by adopting a taper pipe, the rotating urea diffuses to the periphery under the action of centrifugal force, the expansion of the taper pipe enhances the diffusion effect, and the mixing effect of air flow is improved; the spiral mixer improves the uniformity of gas flow mixing and ammonia distribution on the end face of the SCR carrier.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (8)
1. A spiral piece type urea mixing device comprises an air inlet assembly (1), a cylinder body (2), a front end cover (3), a nozzle base (4), a urea nozzle (5), a rotational flow assembly (6) and a supporting plate (7), and is characterized in that the rotational flow assembly (6) is arranged in the cylinder body (2), the front end of the rotational flow assembly (6) is connected with the front end cover (3), the rear end of the rotational flow assembly (6) is connected with the supporting plate (7), the supporting plate (7) is connected onto the cylinder body (2), a nozzle base (4) used for installing the urea nozzle (5) is connected to an opening at the front end of the front end cover (3), and the air inlet assembly (1) used for connecting an air inlet pipe is connected to an opening of the cylinder body (2);
the cyclone assembly (6) comprises a mixing cavity partition plate (6-1), a spiral sheet (6-2), a hole pipe (6-3) and an expansion pipe (6-4), wherein an air outlet is formed in one end of the mixing cavity partition plate (6-1), one end of the expansion pipe (6-4) is connected to the air outlet in one end of the mixing cavity partition plate (6-1) and sleeved with the hole pipe (6-3), the other end of the expansion pipe (6-4) is connected to a support plate (7), and the spiral sheet (6-2) is sleeved at the front end of the hole pipe (6-3) and welded on the mixing cavity partition plate (6-1); the side surface of the mixing cavity partition plate (6-1) is provided with a notch, the spiral piece (6-2) comprises an extension end and an arc end, the extension end is connected with one end of the notch, and the arc end surrounds the outer side of the hole pipe (6-3) and is connected with the air outlet hole on the mixing cavity partition plate (6-1) through a bottom flanging of the arc end so as to form an annular air flow channel in the mixing cavity partition plate (6-1).
2. A spiral-plate urea mixing device according to claim 1, characterized in that the radial clearance between the perforated pipe (6-3) and the expansion pipe (6-4) is 6-13 mm.
3. A spiral-plate urea mixing device according to claim 1, characterized in that the legs at both ends of the perforated pipe (6-3) are connected to the spiral plate (6-2) and the expansion pipe (6-4), respectively.
4. A spiral-plate urea mixing device according to claim 3, characterized in that the perforated pipe (6-3) is provided with two legs at the front and back ends.
5. A spiral-plate urea mixing device according to claim 1, characterized in that the cyclone assembly (6) and the support plate (7) form a first mixing chamber in the barrel (2), and the cyclone assembly (6) and the front end cover (3) form a second mixing chamber in the barrel (2).
6. A spiral-plate urea mixing device according to claim 1, characterized in that the extension ends of the spiral plates (6-2) are sealed and the arc ends are open.
7. A spiral-plate urea mixing device according to claim 1, characterized in that the front end of the perforated pipe (6-3) is provided with a plurality of large holes and the rear end thereof is provided with a plurality of small holes.
8. A spiral piece type urea mixing device according to claim 7, wherein the diameter of the large holes is 6-10 mm, and the diameter of the small holes is 4-6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021157271.5U CN212318126U (en) | 2020-06-22 | 2020-06-22 | Spiral slice type urea mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021157271.5U CN212318126U (en) | 2020-06-22 | 2020-06-22 | Spiral slice type urea mixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212318126U true CN212318126U (en) | 2021-01-08 |
Family
ID=74027589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021157271.5U Active CN212318126U (en) | 2020-06-22 | 2020-06-22 | Spiral slice type urea mixing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212318126U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648845A (en) * | 2020-06-22 | 2020-09-11 | 无锡威孚力达催化净化器有限责任公司 | Spiral slice type urea mixing device |
| CN113790092A (en) * | 2021-09-27 | 2021-12-14 | 无锡威孚力达催化净化器有限责任公司 | Double-vortex flow type urea mixing device |
-
2020
- 2020-06-22 CN CN202021157271.5U patent/CN212318126U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111648845A (en) * | 2020-06-22 | 2020-09-11 | 无锡威孚力达催化净化器有限责任公司 | Spiral slice type urea mixing device |
| CN113790092A (en) * | 2021-09-27 | 2021-12-14 | 无锡威孚力达催化净化器有限责任公司 | Double-vortex flow type urea mixing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212318126U (en) | Spiral slice type urea mixing device | |
| CN207945006U (en) | Side air inlet spar-type platforms SCR mixing arrangements | |
| CN213175779U (en) | Chassis type SCR purifier and axial injection urea mixing device thereof | |
| CN110332035B (en) | SCR mixer and engine | |
| CN108194178B (en) | A kind of radial spray mixer for mixing exhaust and reducing agent fluid | |
| WO2020155834A1 (en) | Swirl vane-type urea injection mixing apparatus | |
| WO2016146015A1 (en) | Mixing tube and exhaust gas treatment device thereof | |
| CN112983604B (en) | SCR urea solution mixer | |
| CN209179849U (en) | Engine exhaust post-processes mixing arrangement | |
| CN214403720U (en) | SCR mixing device | |
| CN111648845A (en) | Spiral slice type urea mixing device | |
| CN111779558A (en) | Urea mixer for U-shaped large end cover | |
| CN112196646A (en) | Mixer assembly and exhaust aftertreatment package | |
| CN111156072A (en) | Tail gas aftertreatment mixing arrangement | |
| CN112814767A (en) | Ammonia mixer of automobile exhaust system | |
| CN208138018U (en) | SCR assembly integrating sound elimination function | |
| CN114542248A (en) | SCR system and engine | |
| CN109826697B (en) | Swirl device for diesel engine emission aftertreatment | |
| CN217233627U (en) | U-shaped post-treatment urea mixing device | |
| CN208816207U (en) | A kind of diesel SCR catalytic exhaust apparatus | |
| CN213450557U (en) | Mixing chamber subassembly and tail gas aftertreatment encapsulation | |
| CN107076000A (en) | Vertical ultrasonic Wave Decomposition pipe | |
| CN212690146U (en) | A blade blender for end cover side is spouted | |
| CN111963281B (en) | High-efficient blender of diesel engine aftertreatment | |
| CN210889080U (en) | Liquid-gas mixing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |