CN118148751A - Mixer, SCR, aftertreatment system and vehicle - Google Patents
Mixer, SCR, aftertreatment system and vehicle Download PDFInfo
- Publication number
- CN118148751A CN118148751A CN202410585366.3A CN202410585366A CN118148751A CN 118148751 A CN118148751 A CN 118148751A CN 202410585366 A CN202410585366 A CN 202410585366A CN 118148751 A CN118148751 A CN 118148751A
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- flow
- air
- mixing core
- air outlet
- mixer
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000004202 carbamide Substances 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims description 77
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 24
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The invention belongs to the technical field of aftertreatment systems, and discloses a mixer, SCR, an aftertreatment system and a vehicle. The mixer includes a barrel, a mixing core, a support structure, and a flow directing assembly. The mixing core is in communication with a urea supply unit in which the engine exhaust gas stream and urea can be mixed. The support structure is arranged in the cylinder body and divides the inner space of the cylinder body into an upper air part, a middle air part and a lower air part, the support structure is opposite to the position of the air flow inlet of the cylinder body, an air inlet channel is formed in the position, opposite to the air flow inlet of the cylinder body, of the support structure, and the exhaust air flow of the engine can enter the mixing core from the air inlet channel along the axial direction of the cylinder body in a straight-line flow direction. The flow guiding component is arranged on the outer side of the mixing core in a surrounding mode, so that the exhaust air flow of the engine enters the mixing core in a swirl mode with opposite swirl directions at the upper air part and the lower air part. The mixer can enrich the air inlet path, promote the mixing sufficiency of urea and engine exhaust air flow, and effectively alleviate the problem of urea crystallization.
Description
Technical Field
The invention relates to the technical field of aftertreatment systems, in particular to a mixer, SCR (selective catalytic reduction), an aftertreatment system and a vehicle.
Background
SCR (SELECTIVE CATALYTIC Reduction selective catalytic Reduction unit) is a device for eliminating nitrogen oxides in engine exhaust gas by using a selective catalytic Reduction reaction, which can convert nitrogen oxides in engine exhaust gas into nitrogen gas under the action of a catalyst by using ammonia gas generated by urea hydrolysis. A mixer is typically provided at the inlet end of the SCR to thoroughly mix the urea spray and engine exhaust before entering the SCR carrier to increase the conversion efficiency of nitrogen oxides.
The mixer that prior art provided is provided with the swirl tube for make engine exhaust and urea form the whirl, then set up the steel wool in the mixer exit position, urea and engine exhaust pass through the effect of swirl tube and mix the back and get into the SCR carrier through the steel wool. Above-mentioned blender has urea and the problem that engine exhaust mixing time is short, mix inadequately and the air current velocity of flow is low, and the wire cloth that sets up can lead to the too high problem of backpressure, and then leads to urea crystallization to eliminate incompletely.
The prior art proposes an aftertreatment package that allows engine exhaust to enter in a reverse spin manner on the upper and lower sides of the mixer axis by providing a swirl assembly to reduce back pressure. The aftertreatment package still has the problem of insufficient air inlet mode of the mixer, and the mixing sufficiency of urea and the exhaust gas flow of the engine needs to be improved.
Accordingly, there is a need for a mixer, SCR, aftertreatment system and vehicle that address the above issues.
Disclosure of Invention
According to one aspect of the present invention, it is an object to provide a mixer that is capable of enriching an intake path, improving mixing sufficiency of urea and an engine exhaust gas flow, and effectively alleviating the problem of urea crystallization.
To achieve the purpose, the invention adopts the following technical scheme:
a mixer, comprising:
A cylinder;
A mixing core, which is communicated with the urea supply unit, and in which an engine exhaust gas flow and urea can be mixed;
The support structure is arranged in the cylinder body and divides the inner space of the cylinder body into an upper air part, a middle air part and a lower air part, an air inlet channel is formed in the position, opposite to the air flow inlet of the cylinder body, of the support structure, and the exhaust air flow of the engine can enter the mixing core from the air inlet channel along the axial direction of the cylinder body in a straight-line flow direction;
the flow guiding assembly is arranged on the outer side of the mixing core in a surrounding mode, so that the exhaust air flow of the engine enters the mixing core in a swirl mode with opposite swirl directions at the upper air part and the lower air part.
As an alternative scheme of the mixer provided by the invention, the bracket structure comprises an air outlet positioning part and a stop part, wherein the stop part is arranged in the cylinder body and divides the cylinder body into an air inlet section and an air outlet section, and the cyclone plate is positioned in the air outlet section;
The air outlet positioning part is positioned at the air inlet section and connected with the stop part, the mixing core is positioned at the air outlet positioning part, the space of the cylinder above the air outlet positioning part is the upper air part, the space of the cylinder below the air outlet positioning part is the lower air part, and the cavity in the air outlet positioning part is the middle air part;
and the air flow of the air inlet section flows to the air outlet section through the air outlet of the air outlet positioning part.
As an alternative scheme of the mixer provided by the invention, the mixer further comprises a cyclone plate, wherein the cyclone plate is arranged in the cylinder and is positioned in the air outlet section, and the engine exhaust air flow flowing out from the air outlet of the air outlet positioning part flows through the cyclone plate and then flows out in a cyclone mode.
As an alternative scheme of the mixer provided by the invention, the center of the cyclone plate is provided with a diversion cambered surface, the cyclone plate is also provided with a plurality of circulation parts, and the circulation parts are arranged in an annular array by taking the diversion cambered surface as the center;
the air outlet is opposite to the diversion cambered surface, and the diversion cambered surface can guide the engine exhaust air flow flowing out of the air outlet to the circulation part, and the engine exhaust air flow flowing into the circulation part flows out in a rotational flow mode.
As an alternative to the mixer provided by the invention, the end of the mixing core remote from the urea supply unit is provided with a perforated bottom bowl from which the engine exhaust gas flow can flow into the mixing core.
As an alternative to the mixer provided by the invention, a perforated plate is provided in the mixing core, the perforated plate being arranged at an angle to the axial direction of the mixing core.
As an alternative scheme of the mixer provided by the invention, the flow guiding assembly comprises a first flow guiding piece and a second flow guiding piece, wherein the first flow guiding piece and the second flow guiding piece are arranged at intervals along the axial direction of the mixing core and are respectively arranged on the periphery of the mixing core in a surrounding way;
The direction of the side opening of the first flow guiding piece is opposite to the direction of the side opening of the second flow guiding piece, and the rotational flow direction of the engine exhaust gas flow flowing into the mixing core along the first flow guiding piece is opposite to the rotational flow direction of the engine exhaust gas flow flowing into the mixing core along the second flow guiding piece.
As an alternative to the mixer provided by the present invention, the mixer further includes a rectifying plate through which the swirling engine exhaust gas flow flowing out of the swirling plate can be integrated and flow out of the cylinder in a straight flow manner.
According to a further aspect of the invention, it is an object to provide an SCR comprising an SCR carrier and a urea supply unit, as well as a mixer according to any of the above aspects, which mixer is arranged at the inlet end of the SCR carrier, which urea supply unit communicates with the mixing core of the mixer, into which mixer urea can be supplied, into which mixer urea can be mixed in advance with an engine exhaust gas flow.
According to yet another aspect of the present invention, it is an object to provide an aftertreatment system comprising a DOC, a DPF, and an SCR as set forth in the above, the DOC being in communication with an exhaust pipe of an engine, the DPF being in communication with the DOC, the SCR being configured to harmlessly treat nitrogen oxides in an exhaust gas stream of the engine.
According to still another aspect of the present invention, it is an object to provide a vehicle including an engine and an aftertreatment system as set forth in the above-described aspects, the aftertreatment system being disposed at a rear end of the engine exhaust pipe.
The invention has the beneficial effects that:
The mixer provided by the invention comprises a cylinder body, a mixing core, a bracket structure and a flow guide assembly. The mixing core is in communication with a urea supply unit, in which the engine exhaust gas flow and urea can be mixed. By means of the mixing core, urea and engine exhaust gas flow can be mixed, and the contact area of the urea and the engine exhaust gas flow is increased. The support structure is arranged in the cylinder body, the inner space of the cylinder body is divided into an upper air part, a middle air part and a lower air part, an air inlet channel is formed at the position, opposite to an air flow inlet of the cylinder body, of the support structure, and exhaust air flow of the engine can directly enter the mixing core along the axial direction of the cylinder body from the air inlet channel in a straight-line flow direction. The flow guiding component is arranged outside the mixing core in a surrounding way, so that the exhaust gas flow of the engine enters the mixing core in a swirl mode with opposite swirl directions at the upper gas part and the lower gas part. Through the arrangement of the engine exhaust gas flow in opposite rotation directions in the upper gas part and the lower gas part, the uniformity and the flow speed of the engine exhaust gas flow can be improved, the back pressure is reduced, and the mixing effect of the engine exhaust gas flow and urea is improved. Through the setting of this supporting structure and air inlet channel, can make engine exhaust air current get into the mixing core with sharp route, on the basis that the spiral route of two different directions got into the mixing core, further richened the air inlet route of mixing the core, effectively improved urea and engine exhaust air current's quick intensive mixing.
The urea in the SCR provided by the invention is not easy to crystallize, and has good harmless treatment effect and high efficiency on nitrogen oxides in the exhaust gas flow of the engine.
The aftertreatment system provided by the invention can carry out innocent treatment on the exhaust gas flow of the engine, and ensures the environmental protection of the exhaust.
Drawings
FIG. 1 is a schematic diagram of an SCR provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a mixer according to an embodiment of the present invention;
FIG. 3 is a partially exploded schematic illustration of a mixer provided in an embodiment of the present invention;
FIG. 4 is an exploded schematic view of a hybrid core provided by an embodiment of the present invention;
FIG. 5 is a schematic structural view of a support structure according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a swirl plate according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a rectifying plate according to an embodiment of the present invention;
FIG. 8 is a cloud of mixer face airflow velocity uniformity provided by an embodiment of the invention;
FIG. 9 is a cloud chart of the ammonia distribution uniformity of the mixer end face provided by an embodiment of the present invention;
fig. 10 is a flow chart of air flow rates in a mixer provided by an embodiment of the invention.
In the figure:
10. A urea supply unit; 20. an SCR carrier; 30. a mixer;
100. A cylinder;
200. A mixing core; 210. a mixing through hole; 220. a perforated bottom bowl; 230. a porous plate;
300. a flow guiding assembly; 310. a first flow guide; 320. a second flow guide;
400. A support structure; 410. an air outlet positioning part; 411. a first positioning plate; 4111. a first mounting hole; 4112. a first vent hole; 412. a second positioning plate; 4121. a second mounting hole; 4122. a second vent hole; 413. a connecting plate; 4131. an end air inlet; 420. a stop portion;
500. A swirl plate; 510. a diversion cambered surface; 520. a flow-through section; 521. swirl air outlet holes; 522. a baffle;
600. a rectifying plate; 610. and a rectifying air outlet hole.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Fig. 1 shows a schematic diagram of an SCR provided by an embodiment of the present invention. Referring to FIG. 1, the present embodiment provides a mixer, SCR, aftertreatment system, and vehicle. The vehicle comprises an engine and the aftertreatment system provided by the embodiment, wherein the aftertreatment system comprises a DOC (Diesel Oxidation Catalyst oxidation catalytic unit), a DPF (Diesel Particulate Filter diesel particulate trap unit) and the SCR which are sequentially arranged at the rear end of an engine exhaust pipe. The DOC is communicated with an exhaust pipe of the engine, the DPF is communicated with the DOC, and the SCR is communicated with the DOC. The SCR is configured to harmlessly treat nitrogen oxides in an engine exhaust gas stream.
Specifically, the SCR includes an SCR carrier 20 and a urea supply unit 10, and further includes a mixer 30 provided in the present embodiment. The mixer 30 is disposed at an inlet end of the SCR carrier 20, the urea supply unit 10 is connected to the mixer 30, urea can be supplied into the mixer 30, and urea and engine exhaust gas flow can be premixed in the mixer 30 before entering the SCR carrier 20. The urea supply unit 10 includes a urea tank and a urea injection device that communicates with the urea tank and the mixer 30. The engine exhaust gas flow enters the mixer 30, and meanwhile, a urea injection device injects quantitative urea aqueous solution into the mixer 30 in a granular form, a catalyst is arranged in the SCR carrier 20, and urea and harmful nitrogen oxides in the engine exhaust gas flow undergo selective reduction reaction under the action of the catalyst to react into harmless nitrogen.
FIG. 2 shows a schematic structural view of a mixer provided by an embodiment of the present invention; fig. 3 shows a partially exploded schematic view of a mixer provided by an embodiment of the present invention. Referring to fig. 2 and 3, the present embodiment provides a mixer 30 including a barrel 100 and a mixing core 200. The opening at one end in the axial direction of the cylinder 100 is an air inlet that communicates with the exhaust pipe of the engine, and the opening at the other end is an air outlet that communicates with the inlet of the SCR carrier 20. The mixing core 200 is disposed in the cylinder 100 and is disposed at an angle to the axial direction of the cylinder 100, and in this embodiment, the mixing core 200 is disposed specifically perpendicular to the axial direction of the cylinder 100. The mixing core 200 is connected to the urea injection device of the urea supply unit 10, and is provided with a plurality of mixing through holes 210, and engine exhaust gas flow can flow from the mixing through holes 210 into the mixing core 200. That is, the engine exhaust gas flow can flow in from the flow inlet and into the mixing core 200 to be thoroughly mixed with urea, and the completely mixed engine exhaust gas flow and urea flow from the flow outlet to the SCR carrier 20 to react.
Fig. 4 is an exploded view showing a structure of a mixing core according to an embodiment of the present invention, and referring to fig. 3 and 4, the mixing core 200 has a hollow cylindrical structure with two open ends, and a plurality of mixing through holes 210 are formed at a peripheral side portion of the mixing core 200. One end of the mixing core 200 can extend out of the cylinder 100 and be connected to the urea injection device, the other end of the mixing core is arranged in the cylinder 100, a porous bottom bowl 220 is arranged, engine exhaust gas flow can flow into the mixing core 200 from the porous bottom bowl 220, that is, the engine exhaust gas flow can flow into the mixing core 200 from the periphery of the mixing core 200 and can flow into the mixing core 200 from the bottom end of the mixing core 200 through the porous bottom bowl 220, the richness of the air inlet path of the mixing core 200 is increased, the uniformity of air inlet is ensured, the uniform mixing of the exhaust gas flow and urea of the following engine is facilitated, and the uniformity of the urea distribution and the uniformity of the speed of the air flow out of the mixer are improved, and the effect can be shown by cloud diagrams in fig. 8 and 9.
Specifically, the mixing core 200 is provided therein with a porous plate 230. The porous plate 230 has a disk-like structure disposed at an angle to the axial direction of the mixing core 200, and in this embodiment, the porous plate 230 is disposed perpendicular to the axial direction of the mixing core 200, above the porous bottom bowl 220. By providing the porous plate 230, the porous plate 230 can pass the air supply flow, but can block urea particles to a certain extent, and strengthen the collision and decomposition of urea particles.
Fig. 5 shows a schematic structural view of a support structure provided by an embodiment of the present invention, and referring to fig. 2, 3 and 5, the mixer further includes a support structure 400. The support structure 400 is disposed within the barrel 100, and the mixing core 200 is positioned within the support structure 400. The bracket structure 400 can improve the assembly stability of the hybrid core.
Specifically, the support structure 400 is disposed in the cylinder 100, and divides the internal space of the cylinder 100 into an upper air part, a middle air part and a lower air part. The engine exhaust gas flow enters the mixing core 200 in a swirl manner with opposite swirl directions at the upper gas part and the lower gas part, an air inlet channel is formed at the position of the bracket structure 400 opposite to the gas flow inlet of the cylinder 100, and the engine exhaust gas flow can enter the mixing core 200 from the air inlet channel in a straight-line flow direction along the axis direction of the cylinder 100. Through the arrangement of the engine exhaust gas flow in opposite rotation directions in the upper gas part and the lower gas part, the uniformity and the flow speed of the engine exhaust gas flow can be improved, the back pressure is reduced, and the mixing effect of the engine exhaust gas flow and urea is improved. Through the arrangement of the support structure 400, the engine exhaust gas flow can enter the mixing core 200 in a straight line path and two different-direction spiral direction paths, so that the air inlet path of the mixing core 200 is further enriched, the rapid and full mixing of urea and the engine exhaust gas flow is effectively improved, and the effect can be shown by an air flow speed flow diagram in fig. 10.
Specifically, the support structure 400 includes an air out positioning portion 410 and a stopper portion 420. The stop part 420 has a circular plate structure, is disposed in the cylinder 100 and is perpendicular to the axis of the cylinder 100, and divides the cylinder 100 into an air inlet section and an air outlet section along the axis direction, wherein the air inlet section is a part between the air inlet of the cylinder 100 and the stop part 420, and the air outlet section is a part between the air outlet of the cylinder 100 and the stop part 420. The air outlet positioning portion 410 is located at the air inlet section and connected to the stopping portion 420. The mixing core 200 can be positioned at the air outlet positioning portion 410, the air outlet of the air outlet positioning portion 410 is disposed at the stop portion 420, and the engine exhaust air flow and urea are mixed in the air inlet section and can only flow from the air outlet to the air outlet section.
More specifically, the air outlet positioning portion 410 includes a first positioning plate 411, a second positioning plate 412, and a connecting plate 413. The first positioning plate 411 and the second positioning plate 412 are parallel to each other and are spaced apart from each other along a direction perpendicular to the axial direction of the cylinder 100, and an air portion is defined between the first positioning plate 411 and the second positioning plate 412. The connecting plate 413 is disposed at one ends of the first positioning plate 411 and the second positioning plate 412 near the air inlet, and the ends of the first positioning plate 411 and the second positioning plate 412 far from the connecting plate 413 are respectively connected to the stop portion 420 to form a strip-shaped air outlet. The first positioning plate 411 and the second positioning plate 412 are respectively provided with a first mounting hole 4111 and a second mounting hole 4121, the first mounting hole 4111 and the second mounting hole 4121 are opposite to each other, and the mixing core 200 penetrates through the first mounting hole 4111 and the second mounting hole 4121 to realize positioning.
More specifically, the first positioning plate 411 is provided with a plurality of first ventilation holes 4112, the second positioning plate 412 is provided with a plurality of second ventilation holes 4122, and the connecting plate 413 is provided with a plurality of end air inlets 4131 to form an air inlet channel for facilitating the exhaust air flow of the transmitter to enter the middle air part in a direction parallel to the axis of the cylinder 100. Through the above arrangement, the engine exhaust gas flow can flow through the intake section of the cylinder 100, preventing the occurrence of the problem that the first positioning plate 411, the second positioning plate 412 or the connecting plate 413 blocks the flow, causing the rise of the back pressure.
With continued reference to fig. 2 and 3, the mixer further includes a flow guide assembly 300, wherein the flow guide assembly 300 is disposed around the periphery of the mixing core 200, so that the engine exhaust gas flows into the mixing core 200 in a swirling manner. Through the flow guiding assembly 300, the engine exhaust gas flow can flow into the mixing core 200 in a rotational flow manner, so that the uniformity and the flow speed of the engine exhaust gas flow are improved, the back pressure is reduced, and the mixing effect of the engine exhaust gas flow and urea is improved.
Specifically, the baffle assembly 300 includes a first baffle 310 and a second baffle 320. The first flow guiding members 310 and the second flow guiding members 320 are arranged at intervals along the axial direction of the mixing core 200, and are respectively arranged around the circumference of the mixing core 200, the first flow guiding members 310 are specifically arranged at one side of the first positioning plate 411, which is away from the second positioning plate 412, and the second flow guiding members 320 are specifically arranged at one side of the second positioning plate 412, which is away from the first positioning plate 411. The side openings of the first flow guide 310 and the side openings of the second flow guide 320 are disposed opposite to each other, and the swirling direction of the engine exhaust gas flow flowing into the mixing core 200 along the first flow guide 310 is opposite to the swirling direction of the engine exhaust gas flow flowing into the mixing core 200 along the second flow guide 320. By the above arrangement, two kinds of swirl directions into the mixing core 200 can be provided for the engine exhaust gas flow, and the speed uniformity of the engine exhaust gas flow is improved.
Fig. 6 shows a schematic structural diagram of a swirl plate according to an embodiment of the present invention, and referring to fig. 2,3 and 6, the mixer further includes a swirl plate 500. The swirl plate 500 is disposed in the cylinder 100, at the rear end of the mixing core 200, and at the air outlet section of the cylinder 100. The engine exhaust gas flow can flow out in a swirling manner after flowing into the swirling plate 500. By providing the swirl plate 500, the engine exhaust gas flow flowing out of the mixing core 200 can form swirl again, so that the mixing degree of the engine exhaust gas flow and urea is further enhanced, and the problem of urea crystallization is effectively alleviated.
Specifically, a diversion cambered surface 510 is disposed at the center of the swirl plate 500, the diversion cambered surface 510 is in a circular ring structure, protrudes towards the direction of the stop portion 420, and gradually decreases in height along the radial direction away from the geometric center of the swirl plate 500, so as to guide the airflow, and facilitate the airflow flowing on the swirl plate 500. The swirl plate 500 is further provided with a plurality of flow-through portions 520, and the plurality of flow-through portions 520 are arranged in an annular array with the flow-guiding cambered surface 510 as a center. The air outlet of the air outlet positioning portion 410 is opposite to the diversion cambered surface 510, and the diversion cambered surface 510 can guide the engine exhaust air flow flowing out from the air outlet to the circulation portion 520, and the engine exhaust air flow flowing into the circulation portion 520 flows out in a rotational flow manner.
More specifically, the flow-through portion 520 includes a swirl outlet orifice 521 and a baffle 522. The cyclone outlet 521 is formed in the cyclone plate 500, and the baffle 522 is disposed on a side of the cyclone plate 500 facing the stop 420 and on a side of the cyclone outlet 521. Under the action of the baffles 522, the airflow guided to the swirl outlet holes 521 by the diversion cambered surface 510 can form a swirl.
Fig. 7 is a schematic structural view of a rectifying plate according to an embodiment of the present invention, and referring to fig. 2, 3 and 7, the mixer 30 further includes a rectifying plate 600, and the rectifying plate 600 has a circular plate-like structure, and a shape of the rectifying plate matches a shape of an air flow outlet of the cylinder 100. The rectifying plate 600 is provided with a plurality of rectifying outlet holes 610. The plurality of rectifying air outlet holes 610 can be uniformly distributed or non-uniformly distributed according to actual needs, the number and the aperture size can be selected according to actual situations, and the shape is not limited to round holes or strip holes. The swirling engine exhaust gas flow flowing out of the swirling plate 500 can be integrated through the rectifying plate 600 and flow out of the cylinder 100 in a straight line.
Preferably, in this embodiment, in order to adapt to the flow rate of the exhaust gas flow of the engine flowing through the cross section of the cylinder 100, the plurality of rectifying outlet holes 610 at the center of the rectifying plate 600 may be set to have a larger aperture to adapt to the larger flow rate at the same time, and the plurality of rectifying outlet holes 610 around the periphery of the center may be set to have a smaller aperture to facilitate the flow rate at the center.
When the engine exhaust gas flow enters from the gas flow inlet of the cylinder 100, the engine exhaust gas flow is divided into two approximately, wherein one air flow forms a forward rotational flow under the guiding action of the first guiding element 310, and enters the mixing core 200 from the mixing through hole 210 located in the area of the side of the first positioning plate 411 facing away from the second positioning plate 412, and the other air flow forms a reverse rotational flow under the guiding action of the second guiding element 320, and enters the mixing core 200 from the mixing through hole 210 located in the area of the side of the second positioning plate 412 facing away from the first positioning plate 411. After the exhaust gas flow of the engine and the urea are fully mixed in the mixing core 200, the exhaust gas flow flows onto the diversion cambered surface 510 from the gas outlet of the gas outlet positioning part 410, is guided to the circulation part 520 by the diversion cambered surface 510, flows to the rectifying plate 600 in a rotational flow mode, and flows to the inlet of the SCR carrier 20 in a linear flow mode under the action of the rectifying plate 600.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (11)
1. A mixer, comprising:
a cylinder (100);
A mixing core (200) in communication with the urea supply unit (10), the engine exhaust gas flow and urea being capable of mixing in the mixing core (200);
The support structure (400) is arranged in the cylinder body (100), the inner part of the cylinder body (100) is divided into an upper air part, a middle air part and a lower air part, an air inlet channel is formed in the position, opposite to an air flow inlet of the cylinder body (100), of the support structure (400), and the exhaust air flow of the engine can enter the mixing core (200) from the air inlet channel in a straight-line flow direction along the axis direction of the cylinder body (100);
and the flow guide assembly (300) is arranged on the outer side of the mixing core (200) in a surrounding mode, so that the exhaust gas flow of the engine enters the mixing core (200) in a swirl mode with opposite swirl directions at the upper gas part and the lower gas part.
2. The mixer of claim 1, wherein the bracket structure (400) comprises an air outlet positioning portion (410) and a stop portion (420), the stop portion (420) being disposed within the barrel (100) dividing the barrel (100) into an air inlet section and an air outlet section;
The air outlet positioning part (410) is positioned at the air inlet section and connected with the stop part (420), the mixing core (200) is positioned at the air outlet positioning part (410), a space of the cylinder (100) above the air outlet positioning part (410) is the upper air part, a space of the cylinder (100) below the air outlet positioning part (410) is the lower air part, and a cavity in the air outlet positioning part (410) is the middle air part;
the air flow of the air inlet section flows to the air outlet section through the air outlet of the air outlet positioning part (410).
3. The mixer according to claim 2, further comprising a swirl plate (500), wherein the swirl plate (500) is disposed in the barrel (100) and is located in the air outlet section, and the engine exhaust air flow flowing out from the air outlet of the air outlet positioning portion (410) flows through the swirl plate (500) and then flows out in a swirling manner.
4. A mixer according to claim 3, wherein a diversion cambered surface (510) is arranged at the center of the cyclone plate (500), the cyclone plate (500) is further provided with a plurality of circulation parts (520), and the plurality of circulation parts (520) are arranged in an annular array with the diversion cambered surface (510) as the center;
The air outlet of the air outlet positioning part (410) is opposite to the diversion cambered surface (510), and the diversion cambered surface (510) can guide the engine exhaust air flow flowing out from the air outlet to the circulation part (520), and the engine exhaust air flow flowing into the circulation part (520) flows out in a rotational flow mode.
5. The mixer according to claim 1, characterized in that the end of the mixing core (200) remote from the urea supply unit (10) is provided with a perforated bottom bowl (220), from which perforated bottom bowl (220) the engine exhaust gas flow can flow into the mixing core (200).
6. The mixer according to claim 1, characterized in that a perforated plate (230) is provided in the mixing core (200), the perforated plate (230) being arranged at an angle to the axial direction of the mixing core (200).
7. The mixer according to claim 1, wherein the flow guiding assembly (300) comprises a first flow guiding member (310) and a second flow guiding member (320), the first flow guiding member (310) and the second flow guiding member (320) are arranged at intervals along the axial direction of the mixing core (200), and are respectively arranged around the periphery of the mixing core (200);
The direction of the side opening of the first flow guiding member (310) is opposite to the direction of the side opening of the second flow guiding member (320), and the rotational flow direction of the engine exhaust gas flow flowing into the mixing core (200) along the first flow guiding member (310) is opposite to the rotational flow direction of the engine exhaust gas flow flowing into the mixing core (200) along the second flow guiding member (320).
8. The mixer according to any of claims 1-7, further comprising a rectifying plate (600), through which rectifying plate (600) the engine exhaust gas flow can integrate and flow out of the cartridge (100) in a straight flow.
SCR, characterized in that it comprises an SCR carrier (20) and a urea supply unit (10), and further comprises a mixer according to any one of claims 1-8, said mixer being arranged at the inlet end of said SCR carrier (20), said urea supply unit (10) being in communication with said mixing core (200) of said mixer, being able to supply urea into said mixer, in which urea and an engine exhaust gas flow are able to be mixed.
10. An aftertreatment system comprising a DOC in communication with an exhaust pipe of an engine, a DPF in communication with the DOC, and the SCR in communication with the DOC configured to harmlessly treat nitrogen oxides in an exhaust gas stream of the engine, and the SCR of claim 9.
11. A vehicle comprising an engine and the aftertreatment system of claim 11 disposed at a rear end of the engine exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410585366.3A CN118148751A (en) | 2024-05-13 | 2024-05-13 | Mixer, SCR, aftertreatment system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410585366.3A CN118148751A (en) | 2024-05-13 | 2024-05-13 | Mixer, SCR, aftertreatment system and vehicle |
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| CN118148751A true CN118148751A (en) | 2024-06-07 |
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| CN202410585366.3A Pending CN118148751A (en) | 2024-05-13 | 2024-05-13 | Mixer, SCR, aftertreatment system and vehicle |
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