CN217270407U - Mixer, diesel engine tail gas after-treatment system and diesel vehicle - Google Patents
Mixer, diesel engine tail gas after-treatment system and diesel vehicle Download PDFInfo
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- CN217270407U CN217270407U CN202123449978.0U CN202123449978U CN217270407U CN 217270407 U CN217270407 U CN 217270407U CN 202123449978 U CN202123449978 U CN 202123449978U CN 217270407 U CN217270407 U CN 217270407U
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model relates to a blender, diesel engine tail gas aftertreatment system and diesel vehicle belongs to engine aftertreatment technical field, has solved the poor and great problem of aftertreatment backpressure of gas mixture mixing homogeneity in the blender, including the shell, the shell is inside to have set gradually whirl pipe, mixing mechanism, air current switching-over board and perforated plate along the waste gas flow direction, mixing mechanism includes the concave plate, the end of giving vent to anger at the whirl pipe is fixed to the opening end of concave plate, a plurality of exhaust holes have been seted up to the concave plate, and every exhaust hole department is equipped with guide vane, its characterized in that, the edge in exhaust hole includes first edge part and the second edge part that sets up along the pitch arc, guide vane is for setting along the second edge part towards the curved arc of concave plate outside direction and guide vane and the coupling part of concave plate. Adopt the utility model discloses a blender has improved mist's homogeneity and aftertreatment backpressure less.
Description
Technical Field
The utility model relates to an engine aftertreatment technical field, concretely relates to blender, diesel engine tail gas aftertreatment system and diesel vehicle.
Background
The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.
The SCR mixer is arranged between the exhaust pipe and the SCR carrier, and is mainly used for improving the mixing uniformity between urea spray and waste gas and improving the NOx conversion efficiency.
The SCR blender that currently commonly uses is U type blender, and in the present U type blender, present U type blender comprises cyclone tube, porous inner tube, porous outer tube, W board and perforated plate, and urea and waste gas advance to go into the cyclone tube and mix, pass through porous inner tube and porous outer tube mixed evaporation after the cyclone tube flows out, after the reflection of W board, get into the SCR carrier through the perforated plate, and present blender has following defect:
the backpressure of the post-treatment after the porous pipe is adopted is large, the mixing degree of urea and waste gas is limited, the distribution uniformity of ammonia is low, and the emission value of NOx is large.
At present, there is an SCR blender, the setting of perforated pipe has been cancelled, the mixed end bowl structure of whirl at whirl socle end installation increases the secondary and mixes, the limited and great problem of aftertreatment backpressure of above-mentioned urea and waste gas mixing degree has been solved, the inventor discovers, exhaust hole on this SCR blender end bowl adopts the rectangular hole, guide vane adopts the straight strip guide vane of rectangle, the blade can produce great stress in the junction with end bowl, the durability is poor, the guide vane of above-mentioned device adopts welded connection, it is long consuming time to process, if adopt the mould punching press, inconvenient preparation mould, the inventor still discovers, when adopting the straight strip guide vane of rectangle, gaseous both sides space outflow from the blade easily, certain influence has been produced to gaseous flow direction.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above-mentioned prior art, providing a blender, conveniently making the mould, be suitable for batch production, the direction of air current is faster moreover, more smooth and easy and natural.
In order to realize the purpose, the utility model adopts the following technical scheme:
in a first aspect, the embodiment of the utility model provides a mixer, including the shell, spiral-flow tube, mixing mechanism, air current switching-over board and perforated plate have set gradually along the waste gas flow direction in the shell, mixing mechanism includes the notch plate, the end of giving vent to anger at the spiral-flow tube is fixed to the opening end of notch plate, a plurality of exhaust holes have been seted up to the notch plate, and every exhaust hole department is equipped with guide vane, the edge in exhaust hole includes first edge portion and the second edge portion along pitch arc setting, guide vane is along the second edge portion setting for the curved arc of orientation notch plate outside direction and guide vane and the concave plate's the coupling part.
In a second aspect, embodiments of the present invention provide a diesel engine exhaust aftertreatment system, provided with the mixer of the first aspect.
In a third aspect, embodiments of the present invention provide a diesel vehicle provided with the engine aftertreatment system of the first aspect.
Above-mentioned the utility model has the advantages as follows:
the utility model discloses a mixer, mixing mechanism's guide vane is the arc, can adopt the arc mould with notch plate and guide vane integral type stamping process, the arc mould is conveniently processed the preparation, do benefit to batch production, and adopt the guide vane of arc, guide vane and notch plate be connected the face along second edge portion distribution, second edge position arc, make guide vane play the restriction to gaseous flow direction, the gaseous defect of following the blade both ends outflow of rectangle vertical bar blade has been avoided adopting, make gaseous direction that can require according to flowing, the disturbance to other exhaust hole outflow gases has been avoided, make the direction of air current more smooth and easy and natural, the air current mixing dynamics is bigger better, additionally, adopt convex guide vane, guide vane and notch plate's hookup location department stress is little, the durability is better.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a front view of the overall structure of embodiment 1 of the present invention;
fig. 2 is a side view of the whole structure of embodiment 1 of the present invention;
FIG. 3 is a front view of the mixing mechanism according to embodiment 1 of the present invention;
fig. 4 is a bottom view of the mixing mechanism according to embodiment 1 of the present invention;
the device comprises a cyclone tube 1, a mixing mechanism 2, an airflow reversing plate 3, a porous plate 4, a first shell part 5, a second shell part 6, a third shell part 7, a urea injection nozzle 8 and a support plate 9, wherein the first shell part is provided with a first spiral flow inlet and a second spiral flow inlet;
2-1 parts of a concave plate, 2-2 parts of exhaust holes, 2-2-1 parts of a first edge part, 2-2-2 parts of a second edge part, and 2-3 parts of guide vanes;
2-3-1, an inner arc surface, 2-3-2, an outer arc surface, 2-3-3, a first end surface, and 2-3-4, a second end surface.
Detailed Description
Example 1
This embodiment provides a mixing arrangement, for U type mixing arrangement, as shown in fig. 1-2, including shell and the cyclone tube 1 that sets gradually along waste gas flow direction inside the shell that sets gradually of setting up, mixing mechanism 2, airflow reversing plate 3 and perforated plate 4, waste gas gets into cyclone tube 1 through the air inlet of shell, the axis of cyclone tube 1 and the axis mutually perpendicular of shell air inlet, urea jet nozzle 8 on the shell sends into cyclone tube 1 with the urea spray beam, mix with waste gas in cyclone tube 1, mixing mechanism 2 is gone into after the mist flows out cyclone tube 1, mixing mechanism 2 discharges the mist with the form of spiral air current, further improve mixing gas's mixing uniformity, the mist by mixing mechanism 2 exhaust is reflected under airflow reversing plate 3's effect, the gas outlet through perforated plate 4 and shell flows.
The shell adopts a U-shaped shell structure, the shell comprises a first shell part 5, a second shell part 6 and a third shell part 7 which are vertically arranged at two ends of the first shell part 5, the end parts of the second shell part 6 and the third shell part 7 are respectively provided with a flange structure for being connected with other equipment, the cross sections of the second shell part 6 and the third shell part 7 are circular or square, the cross sections of the second shell part and the third shell part in the embodiment are circular, the second shell part 6 is used as an air inlet for being connected with an exhaust tail pipe, the third shell part 7 is used as an air outlet for being connected with an SCR carrier, waste gas discharged by the exhaust tail pipe can enter the inner space of the shell through the second shell part 6, and after being mixed with urea spray beams sprayed into the shell, the waste gas is discharged by the third shell part 7 and enters the SCR carrier.
The end of the first housing part 5 close to the second housing part 6 is provided with a urea injection nozzle 8, and urea can be injected into the interior of the housing through the urea injection nozzle 8 and mixed with exhaust gas.
As shown in fig. 3-4, the mixing mechanism 2 is fixed at the air outlet end of the swirl tube 1, the mixing mechanism includes a concave plate 2-1, the open end of the concave plate 2-1 is fixedly connected with the air outlet end of the swirl tube 1, in one embodiment, the concave plate 2-1 is fixedly connected with the swirl tube 1 in a detachable manner such as a bolt, in another embodiment, the open end of the concave plate 2-1 is welded and fixed with the air outlet end of the swirl tube 1, and those skilled in the art can set the mixing mechanism according to actual needs, and the concave plate 2-1 is welded and fixed with the swirl tube 1, so that the sealing performance can be ensured.
Since the open end of the concave plate 2-1 is fixed with the cyclone tube 1, the concave plate 2-1 is bent toward the direction of the airflow reversing plate 4.
In this embodiment, one side of the concave plate facing the cyclone tube is defined as the inner side of the concave plate, and the other side is defined as the outer side of the concave plate.
The concave plate 2-1 is provided with a plurality of exhaust holes 2-2, the exhaust holes 2-2 are used for exhausting mixed gas exhausted by the cyclone tube 1, the exhaust holes 2-2 are distributed along a closed loop line, the closed loop line is a closed loop circular line or a closed square line or a closed oval line, and the like, and a person skilled in the art can specifically set the exhaust holes according to the shape of the concave plate 2-1, wherein the closed loop line in the embodiment is a closed line with a first section connected to a tail end, such as a circular line or a square line or an oval line.
The area of the exhaust hole 2-2 is larger than the aperture of the perforated pipe in the traditional U-shaped mixer, the flow area of mixed gas is increased, the resistance when the gas flows is reduced, the back pressure of post-treatment is further reduced, and the specific size of the exhaust hole can be set according to actual needs.
In order to make the exhaust distribution uniform, a plurality of exhaust holes 2-2 are distributed at equal intervals along a closed loop line.
In this embodiment, the edge of the exhaust hole includes a first edge portion 2-2-1 and a second edge portion 2-2-2, the first edge portion 2-2-1 is distributed along a straight line, the second edge portion 2-2-2 is distributed along an arc line, one end of the second edge portion is connected to one end of the first edge portion, and the other end of the second edge portion is connected to the other end of the first edge portion, so that the edge line of the exhaust hole is a closed loop line.
The guide vanes 2-3 are arranged at the exhaust holes 2-2, and the guide vanes 2-3 can guide the exhausted gas, so that the exhausted gas flows out in a spiral airflow state, the cyclone effect of the mixed gas is enhanced, the concentration uniformity of NH3 in the mixed gas is further enhanced, and the crystallization risk is reduced.
The guide vanes 2-3 are arc-shaped plates which are bent towards the outer side direction of the concave plate 2-1.
The portion of the guide vane for connection with the concave plate 2-1 is provided along the second edge portion, so that the guide vane can form a window for gas discharge.
The arc-shaped plate is provided with an inner arc surface 2-3-1, an outer arc surface 2-3-2, a first end surface 2-3-3 and a second end surface 2-3-4 which are positioned between the edges of the inner arc surface 2-3-1 and the outer arc surface 2-3-2, the first end surface 2-3-3 is used as the end surface of the arc-shaped plate connected with the concave plate 2-1, the arc-shaped plate is fixed with the bottom surface of the concave plate 2-1 through the first end surface 2-3-3, and the first end surface is arranged along the second edge part of the exhaust hole.
The second end face 2-3-4 is the end face of the mixed gas discharge end, in the embodiment, the tangential plane at the connecting edge of the inner arc face 2-3-1, the outer arc face 2-3-2 and the second end face 2-3-4 have a set included angle which is set to be 35-55 degrees.
When the mixed gas flows through the mixing mechanism, the guide vanes 2-3 guide the mixed gas to form a certain airflow direction, so that the mixing of the post-treatment waste gas is enhanced, and the uniformity of the mixed gas is improved.
In this embodiment, guide vane 2-3 adopt the arc, adopt arc mould to carry out stamping process, for adopting the straight strip blade of rectangle, the mould is convenient for the preparation, do benefit to batch production, and adopt the guide vane of arc, guide vane and concave plate's the face of being connected is along second edge portion distribution, second edge portion arc, the restriction has been played to gaseous flow direction, make gas can flow according to the direction that requires, the interference to other exhaust hole outflow gas flows has been avoided, make the direction of air current faster, it is more smooth and easy and natural, the air current mixing dynamics is bigger better, in addition, adopt convex guide vane, guide vane and concave plate's hookup location department stress is little, the durability is better.
At least one diversion hole is formed in the pipe wall of the cyclone pipe 1, a cyclone sheet extending outwards in an inclined mode is arranged at the diversion hole, and waste gas can enter the cyclone pipe through the diversion hole to form spiral air flow to be mixed with urea entering the cyclone pipe.
In this embodiment, for convenient waste gas gets into cyclone tube 1, multiunit water conservancy diversion hole is seted up to cyclone tube 1's pipe wall, and multiunit water conservancy diversion hole is arranged along cyclone tube 1's axis direction, and same group has a plurality of water conservancy diversion holes and a plurality of water conservancy diversion holes of same group equidistant arrangement.
The projection of second shell 6 on cyclone tube 1 along its axis direction corresponds with the region at water conservancy diversion hole place for the waste gas that second shell 6 flowed in can get into inside cyclone tube 1.
The water conservancy diversion hole adopts the rectangular hole, and water conservancy diversion hole department is provided with the spinning disk that leans out the extension, spinning disk length and water conservancy diversion hole length assorted rectangle piece, and the long limit edge of one side of spinning disk is fixed in the long limit edge of rectangular hole.
Be provided with backup pad 9 between the medial surface of the first shell 5 of the medial surface of the outer tubular surface of cyclone tube 1 and shell promptly, cyclone tube 1 utilizes backup pad 9 to support, in this embodiment, backup pad 9 and cyclone tube 1 and the medial surface welded fastening of first shell 5, and cyclone tube 1 passes through backup pad 9 to be fixed inside first shell 5, and simultaneously, backup pad 9 sets up in the below of water conservancy diversion hole place region, is close to the end setting of giving vent to anger of cyclone tube.
One side of third shell 7 is equipped with airflow reversing plate 3, and airflow reversing plate 3 is fixed in the inside of first shell 5 for the gas of mixing mechanism 2 exhaust commutates, makes the mist get into third shell 7 and then discharges through third shell 7.
The angle between the airflow reversing plate 3 and the axis of the third shell part 7, namely the axis of the air outlet of the shell, is 42-48 degrees, and in the embodiment, the angle between the airflow reversing plate and the axis of the third shell part is 45 degrees.
Install perforated plate 4 in third shell 7, perforated plate 4 sets up the gas outlet position department at the shell for the evaporation hydrolysis of urea promotes the homogeneity that the ammonia distributes, and the perforated plate is a circular slab with third shell cross sectional dimension assorted, and the perforated plate sets up with the axis of third shell is perpendicular, is equipped with a plurality of through-holes of arranging along the array on the perforated plate, the through-hole is the hole of circular port or quad slit or other shapes, and the through-hole on the perforated plate is the circular port in this embodiment.
The working principle of the mixer of the embodiment is as follows: waste gas gets into cyclone tube 1 through second shell 6, urea jet nozzle 8 sprays the urea beam in to cyclone tube 1, waste gas and urea mix in cyclone tube 1, the mist that the mixture formed gets into concave plate 2-1, then discharge through exhaust hole 2-2, form the helical airflow under guide vane 2-3's effect, mist further mixes, the homogeneity of mist has been promoted, mist arrives behind the air current reversing plate 3 through the switching-over action flow direction perforated plate 4 of air current reversing plate, discharge by third shell 7 behind perforated plate 4.
Parts such as shell, cyclone tube 1, mixing mechanism 2, air current reversing plate 3 and perforated plate 4 in this embodiment all adopt high temperature resistant metal material to make, long service life and structural strength are high.
Example 2
The embodiment provides a diesel engine exhaust aftertreatment system, which is provided with the mixer in embodiment 1, wherein the second shell part 6 of the mixer is connected with an exhaust tail pipe as an air inlet, the third shell part 7 is connected with an SCR carrier as an air outlet, and other structures of the diesel engine exhaust aftertreatment system can adopt the existing structures, which are not described in detail herein.
Example 3
The embodiment provides a diesel vehicle provided with the diesel engine exhaust gas after-treatment system of embodiment 2, the diesel vehicle is a passenger car or a heavy truck or an engineering machinery vehicle using a diesel engine, and the like.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. The utility model provides a mixer, includes the shell, and the shell is inside to have set gradually whirl pipe, mixing mechanism, air current switching-over board and perforated plate along the waste gas flow direction, mixing mechanism includes the notch plate, the end of giving vent to anger at the whirl pipe is fixed to the opening end of notch plate, a plurality of exhaust holes have been seted up to the notch plate, and every exhaust hole department is equipped with guide vane, its characterized in that, the edge in exhaust hole includes first edge portion and the second edge portion that sets up along the pitch arc, guide vane is the curved arc of orientation notch plate outside direction and guide vane and the hookup section of notch plate along the second edge portion setting.
2. The mixer of claim 1, wherein the guide vanes have an intrados surface, an extrados surface, and first and second end surfaces between edges of the intrados surface and the extrados surface, the arc plate being secured to the bottom surface of the concave plate by the first end surface, the first end surface being disposed along the second edge portion, and a set angle being provided between a tangential surface at a connecting edge of the intrados surface, the extrados surface and the second end surface.
3. A mixer according to claim 2, wherein said set angle is 35 ° -55 °.
4. A mixer according to claim 1, wherein a plurality of said exhaust holes are equally spaced.
5. A mixer according to claim 1, wherein a support plate is provided between the outer surface of the swirl tube and the inner surface of the housing, the swirl tube being supported by the support plate.
6. A mixer according to claim 1, wherein the axis of said swirl tube is perpendicular to the axis of the inlet of said housing.
7. A mixer according to claim 1, wherein said flow diverter plate is oriented at an angle of 42 ° to 48 ° with respect to the axis of the outlet opening of said housing.
8. A mixer according to claim 1, wherein said perforated plate is disposed at the location of the gas outlet of said housing.
9. An engine exhaust aftertreatment system, characterized in that a mixer according to any one of claims 1-8 is provided.
10. A diesel vehicle characterized by being provided with the engine exhaust aftertreatment system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123449978.0U CN217270407U (en) | 2021-12-31 | 2021-12-31 | Mixer, diesel engine tail gas after-treatment system and diesel vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123449978.0U CN217270407U (en) | 2021-12-31 | 2021-12-31 | Mixer, diesel engine tail gas after-treatment system and diesel vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217270407U true CN217270407U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123449978.0U Active CN217270407U (en) | 2021-12-31 | 2021-12-31 | Mixer, diesel engine tail gas after-treatment system and diesel vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN217270407U (en) |
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2021
- 2021-12-31 CN CN202123449978.0U patent/CN217270407U/en active Active
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