CN113356974A

CN113356974A - Efficient anti-crystallization SCR mixer and automobile comprising same

Info

Publication number: CN113356974A
Application number: CN202110605331.8A
Authority: CN
Inventors: 刘志辉; 许法亮; 陈旭; 魏明; 陈镇; 冯坦; 陈小迅
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-09-07
Anticipated expiration: 2041-05-31
Also published as: CN113356974B

Abstract

The invention discloses a high-efficiency crystallization-preventing SCR mixer and an automobile comprising the same, wherein the high-efficiency crystallization-preventing SCR mixer comprises a post-processor mixer cylinder, a U-shaped mixing pipe and a baffle are arranged in the inner cavity of the post-processor mixer cylinder, and the U-shaped mixing pipe is obliquely arranged in the inner cavity of the post-processor mixer cylinder; the baffle is sleeved on the U-shaped mixing pipe and divides the post-processor mixer cylinder into a first cavity and a second cavity; a plurality of cyclones are also arranged in the second cavity. The invention is provided with the U-shaped mixing pipe, and the rotational flow plate is arranged on one side of the U-shaped pipe, so that the urea fog beam and the exhaust gas are fully mixed, and the requirement on uniformity of ammonia in the mixer is met; the urea spraying angle is adjusted, so that the urea spray beam is prevented from colliding the wall too early, and the risk of crystallization is avoided; the other side of the mixing pipe is provided with a perforated pipe to promote the diffusion mixing of urea and the injection; the cyclone is designed at the rear side of the U-shaped mixing pipe, so that the mixing uniformity of urea and air is further promoted.

Description

Efficient anti-crystallization SCR mixer and automobile comprising same

Technical Field

The invention relates to the technical field of denitration, in particular to an SCR mixing system and an SCR mixer thereof, and particularly relates to a high-efficiency anti-crystallization SCR mixer and an SCR exhaust aftertreatment system comprising the same.

Background

Selective Catalytic Reduction (SCR) refers to the Selective reaction of a reducing agent (such as NH3, liquid ammonia, urea) with NOx in flue gas under the action of a catalyst to produce non-toxic and pollution-free N₂And H₂And O. Automotive exhaust systems include injection systems that inject a Diesel Exhaust Fluid (DEF) or a solution of a reductant, such as urea and water, upstream of a Selective Catalytic Reduction (SCR) catalyst. A mixer is positioned upstream of the SCR catalyst and mixes the engine exhaust gases and the urea conversion products.

Chinese patent No. CN 107530655B discloses a full rotary mixer, comprising: a mixer body defining a mixer central axis and having an inlet configured to receive engine exhaust gas and an outlet; an upstream baffle positioned within the mixer body; a downstream baffle positioned within the mixer body spaced from the upstream baffle in a direction along the mixer central axis; a doser defining a doser axis and positioned to spray a reducing agent into an area between the upstream baffle and the downstream baffle such that a mixture of reducing agent and exhaust gas exits the outlet; and wherein the mixture moves through a rotational flow path of at least 360 degrees before exiting the outlet. It still includes: a mixer body defining a mixer central axis and having an inlet configured to receive engine exhaust gas and an outlet; an upstream baffle positioned within the mixer body; a downstream baffle positioned within the mixer body spaced from the upstream baffle in a direction along the mixer central axis; a doser defining a doser axis and positioned to spray a reducing agent into an area between the upstream baffle and the downstream baffle such that a mixture of reducing agent and exhaust gas exits the outlet; and wherein the mixture moves through a rotational flow path of at least 360 degrees before exiting the outlet. A mixer body defining a mixer central axis and having an inlet configured to receive engine exhaust gas and an outlet; an upstream baffle positioned within the mixer body; a downstream baffle positioned within the mixer body spaced from the upstream baffle in a direction along the mixer central axis; a doser defining a doser axis and positioned to spray a reducing agent into an area between the upstream baffle and the downstream baffle such that a mixture of reducing agent and exhaust gas exits the outlet; and wherein the mixture moves through a rotational flow path of at least 360 degrees before exiting the outlet. A mixer body defining a mixer central axis and having an inlet configured to receive engine exhaust gas and an outlet; an upstream baffle positioned within the mixer body; a downstream baffle positioned within the mixer body spaced from the upstream baffle in a direction along the mixer central axis; a doser defining a doser axis and positioned to spray a reducing agent into an area between the upstream baffle and the downstream baffle such that a mixture of reducing agent and exhaust gas exits the outlet; and wherein the mixture moves through a rotational flow path of at least 360 degrees before exiting the outlet.

The Chinese patent with publication number CN 108331643A discloses a compact DOC-DPF-SCR post-treatment device, which is of a U-shaped structure integrally and sequentially comprises a DOC-DPF unit, an air inlet mixer and an SCR unit from one end to the other end, wherein the DOC-DPF unit is provided with an upward opening for the inlet of gas to be treated. The whole is of a U-shaped structure and sequentially comprises a DOC-DPF unit, an air inlet mixer and an SCR unit which are connected from one end to the other end, the DOC-DPF unit is provided with an upward opening, and the opening is used for allowing gas to be treated to enter. The interface with the opening is swivelling joint, and can pass through to rotate the subassembly of admitting air changes the orientation of air inlet. The interface is provided with a rectifying plate for rectifying the gas to be treated. The mounting support is used for assembling the whole vehicle and is provided with a first clamp and a second clamp which are used for clamping and fixing the DOC-DPF unit through sleeving and a third clamp which is used for clamping and fixing the SCR unit. The mounting bracket is provided with a first right-angle frame, a first hollow arc is fixed in the first right-angle frame, and the first tightening hoop penetrates through the first hollow arc, and is fixed with the mounting bracket.

Chinese patent publication No. CN 109184863 a discloses an SCR mixing system and an SCR mixer thereof, which includes an SCR carrier and a mixer housing with a urea nozzle, and further includes: one end of the first stage divergent pipe is connected with the mixer shell; and the second stage divergent pipe is connected with the other end of the first stage divergent pipe, the other end of the second stage divergent pipe is connected with the SCR carrier, and the first stage divergent pipe and the second stage divergent pipe are pipes which are gradually expanded from the mixer shell to the direction of the SCR carrier. The taper angle of the first stage divergent pipe is smaller than that of the second stage divergent pipe. The first stage divergent pipe and the second stage divergent pipe are connected through a straight pipe. The gas-liquid separator further comprises a first turbulence device used for guiding gas to flow uniformly, and the first turbulence device is arranged at the inlet of the first-stage gradually-expanding pipe. The first turbulence device is grid blades arranged on the inner wall of the inlet of the first-stage divergent pipe, and gas channels are formed between the grid blades. The gas turbulence device further comprises a second turbulence device used for enhancing turbulence of gas in the second-stage gradually-expanding pipe, and the second turbulence device is arranged at an inlet of the second-stage gradually-expanding pipe. The second turbulence device is a spiral blade which is uniformly arranged along the circumferential direction of the inlet of the second-stage gradually-expanding pipe. The SCR carrier is characterized by also comprising a third turbulence device for guiding gas to uniformly pass through the SCR carrier, wherein the third turbulence device is arranged in the middle of the second-stage divergent pipe. The third turbulence device is a disc matched with the middle position of the second-stage gradually-expanding pipe, a large round hole is formed in the center of the disc, and a plurality of small round holes which are uniformly distributed are formed in the circumferential direction of the large round hole.

However, the above technical solution has the following drawbacks: firstly, the post-processor mixer is not compact enough in design, so that the overall size of the vehicle post-processor is large, the cost is increased, and a large vehicle chassis installation control is occupied; secondly, the mixing distance of the mixer is short, so that urea is easily mixed into the SCR carrier in the mixer without being fully mixed, and the carrier is blocked; thirdly, the urea solution in the mixer still has the risk of hitting the wall in the early stage of the urea spray, thus leading to the risk of urea crystal blockage.

Disclosure of Invention

The invention aims to solve the defects of the background technology, and provides a high-efficiency crystallization-preventing SCR mixer and an automobile comprising the same, wherein the mixer is designed in a connecting cavity between a DPF and an SCR of the automobile, a U-shaped mixing pipe is designed, and a swirler is designed at one side of the U-shaped pipe, so that urea fog beams and exhaust gas are fully mixed, and the requirement of ammonia uniformity in the mixer is met; the urea spraying angle is adjusted, so that the urea spray beam is prevented from colliding the wall too early, and the risk of crystallization is avoided; the other side of the mixing pipe is provided with a perforated pipe to promote the diffusion mixing of urea and the injection; the cyclone is designed at the rear side of the U-shaped mixing pipe, so that the mixing uniformity of urea and air is further promoted.

In order to achieve the purpose, the invention adopts the technical scheme that: a high-efficiency anti-crystallization SCR mixer comprises a post-processor mixer cylinder, wherein a U-shaped mixing pipe and a baffle are arranged in the inner cavity of the post-processor mixer cylinder, and the U-shaped mixing pipe is obliquely arranged in the inner cavity of the post-processor mixer cylinder; the baffle is sleeved on the U-shaped mixing pipe and divides an inner cavity of the post-processor mixer cylinder into a first cavity and a second cavity; and a plurality of cyclones are also arranged in the second cavity.

In a preferred embodiment, the U-shaped mixing pipe has a first pipe body, an arc-shaped pipe body, and a second pipe body, and the arc-shaped pipe body is disposed between the first pipe body and the second pipe body to communicate the first pipe body and the second pipe body.

Preferably, the first pipe body and the second pipe body are transitionally connected through an arc-shaped pipe body, and the arc-shaped pipe body penetrates through the baffle and is fixedly connected with the baffle. According to the invention, the mixer is designed in the connecting cavity between the DPF and the SCR of the vehicle, the U-shaped mixing pipe is designed, the urea fog beam is sprayed into the cyclone on one side of the U-shaped pipe, and the spraying angle of the urea fog beam is designed, so that the urea fog beam is prevented from colliding the wall too early, and the risk of crystallization is avoided; the urea fog beam is sprayed into the cyclone to be fully mixed with the exhaust in the cyclone air, so that the urea fog beam and the exhaust are fully mixed, and the requirement of ammonia uniformity in the mixer is met. The efficient anti-crystallization SCR mixer can ensure that the mixer is designed to be compact enough, the mixing flow channel is long enough, and the pressure of the mixer is reduced; the mixer is simple in design structure, easy to machine and form, low in cost, light in weight, capable of meeting the requirements of future automobile industrial post-processing systems and high in practical value.

As a preferred embodiment, the first pipe body of the U-shaped mixing pipe comprises a plurality of swirl plates, the swirl plates are enclosed into a pipe shape, and a gap is reserved between two adjacent swirl plates; the spiral-flow plate is a folded plate, and the cross section of the spiral-flow plate is in a fold line shape.

As a preferred embodiment, a plurality of flow holes are arranged on the second pipe body of the U-shaped mixing pipe, and the plurality of flow holes are circumferentially arranged along the outer wall of the second pipe body at intervals; the cyclone and the second pipe body are positioned on the same side of the baffle.

According to the invention, through the design of the U-shaped mixing pipe flow channel, the rotational flow plate is designed in the front section pipe of the U-shaped mixing pipe to enable the interaction of air flow and urea fog beams, the mixing of urea spray and exhaust gas is increased, and the spray angle of the urea fog beams is designed to reduce the early collision of the urea fog beams on the wall, so that the risk of crystallization is avoided; the middle end of the U-shaped mixing pipe adopts an inclined design, so that the urea solution is prevented from being deposited; the rear section of the U-shaped mixing pipe is provided with a perforated pipe, so that the urea fog beam and the exhaust gas are fully mixed, and the requirement of ammonia uniformity in the mixer is met.

Preferably, the outer wall of the post-processor mixer cylinder is provided with a urea nozzle for injecting urea spray into the post-processor mixer cylinder, and the urea nozzle is communicated with the first pipe body of the U-shaped mixing pipe.

Preferably, the horizontal center line of the baffle is arranged at an obtuse angle with the central axis of the post-processor mixer cylinder, and the U-shaped mixing pipe is arranged perpendicular to the baffle.

In a preferred embodiment, the baffle plate is provided with a mounting hole for a U-shaped mixing pipe to pass through, and the U-shaped mixing pipe and the mounting hole of the baffle plate are welded and fixed.

In a preferred embodiment, the cyclone comprises a cyclone body, a plurality of through holes are formed in the middle of the cyclone body, a plurality of swirl holes are formed around the periphery of the through holes, and each swirl hole is provided with a swirl guide plate which is obliquely arranged. According to the rear end of the efficient anti-crystallization SCR mixer, the urea fog drops and exhaust gas are fully mixed through the effect of the plurality of cyclones, and the ammonia mixing uniformity is improved.

The invention also provides an automobile, and the efficient anti-crystallization SCR mixer is arranged on the automobile.

Compared with the prior art, the method has the following beneficial effects:

firstly, a mixer is designed in a connecting cavity between a DPF and an SCR of a vehicle, a U-shaped mixing pipe flow channel is designed, a rotational flow plate is designed in a front section pipe of the U-shaped mixing pipe to enable interaction of air flow and urea fog beams to increase mixing of urea spray and exhaust, and the spraying angle of the urea fog beams is designed to prevent the urea fog beams from colliding with the wall too early, so that the risk of crystallization is avoided; the middle end of the U-shaped mixing pipe adopts an inclined design, so that the urea solution is prevented from being deposited; the rear section of the U-shaped mixing pipe is provided with a perforated pipe, so that the urea fog beam and the exhaust gas are fully mixed, and the requirement of ammonia uniformity in the mixer is met.

Secondly, the efficient anti-crystallization SCR mixer can enable the mixer to be designed to be compact enough, a mixing flow channel to be long enough, and the pressure of the mixer to be reduced; the mixer is simple in design structure, easy to machine and form, low in cost, light in weight, capable of meeting the requirements of future automobile industrial post-processing systems and high in practical value.

Thirdly, the first pipe body of the U-shaped mixing pipe of the efficient anti-crystallization SCR mixer comprises a plurality of rotational flow plates, the rotational flow plates are enclosed into a pipe shape, a gap is reserved between every two adjacent rotational flow plates, and the special exhaust runner design is adopted; the second pipe body is provided with a plurality of circulation holes, interaction of exhaust and urea spraying is promoted, and the risk of early wall-hitting crystallization of urea is prevented by designing the spraying angle of the urea spraying beam.

Fourthly, the rear end of the efficient anti-crystallization SCR mixer is provided with a plurality of cyclones to fully mix urea fog drops and exhaust gas, so that the ammonia mixing uniformity is improved.

Fifthly, a swirler is arranged on the rear side of a U-shaped mixing pipe of the efficient anti-crystallization SCR mixer, so that the mixing uniformity of urea and air is further promoted.

Drawings

FIG. 1 is a schematic structural diagram of a high-efficiency anti-crystallization SCR mixer;

FIG. 2 is a schematic view of the high efficiency anti-crystallization SCR mixer shown in FIG. 1 at another angle;

FIG. 3 is a schematic cross-sectional view of the high efficiency anti-crystallization SCR mixer shown in FIG. 1;

FIG. 4 is a schematic cross-sectional view of the high efficiency anti-crystallization SCR mixer shown in FIG. 1 at another angle;

FIG. 5 is a schematic perspective view of the U-shaped mixing tube of FIG. 4;

FIG. 6 is a schematic perspective view of the baffle of FIG. 4;

FIG. 7 is an enlarged schematic view of the swirler of FIG. 1;

in the figure: 1-post-processor mixer cylinder, 1.1-first cavity, 1.2-second cavity, 2-U type mixing pipe, 2.1-first pipe, 2.11-rotational flow plate, 2.2-arc pipe, 2.3-second pipe, 2.31-flow hole, 3-baffle, 4-cyclone, 4.1-cyclone body, 4.2-through hole, 4.3-rotational flow hole, 4.4-rotational flow guide plate and 5-urea nozzle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 3, the efficient anti-crystallization SCR mixer of the present invention includes a post-processor mixer cylinder 1, wherein the post-processor mixer cylinder 1 is a hollow cylindrical structure. The inner cavity of the post-processor mixer barrel 1 is provided with a U-shaped mixing pipe 2 and a baffle 3, and the U-shaped mixing pipe 2 is obliquely arranged in the inner cavity of the post-processor mixer barrel 1; the baffle 3 is sleeved on the U-shaped mixing pipe 2, and the baffle 3 divides the inner cavity of the post-processor mixer cylinder 1 into a first cavity 1.1 and a second cavity 1.2; a plurality of cyclones 4 are also arranged in the second cavity 1.2. According to the invention, the mixer is designed in the connecting cavity between the DPF and the SCR of the vehicle, the U-shaped mixing pipe is designed, the spray angle of the urea fog beam is designed through the interaction of the air flow and the urea fog beam, and the early wall collision of the urea fog beam is reduced, so that the risk of crystallization is avoided; then, a cyclone is designed at the back to fully mix the urea fog beam with the exhaust gas, so that the requirement of ammonia uniformity in the mixer is met. The efficient anti-crystallization SCR mixer can ensure that the mixer is designed to be compact enough, the mixing flow channel is long enough, and the pressure of the mixer is reduced; the mixer is simple in design structure, easy to machine and form, low in cost, light in weight, capable of meeting the requirements of future automobile industrial post-processing systems and high in practical value.

As shown in fig. 4, the U-shaped mixing tube 2 has a first tube body 2.1, an arc tube body 2.2 and a second tube body 2.3, and the cross sections of the first tube body 2.1, the arc tube body 2.2 and the second tube body 2.3 are all circular structures. The arc body 2.2 sets up be used for communicating between first body 2.1 and the second body 2.3 with both. The first pipe body 2.1 and the second pipe body 2.3 are in transition connection through an arc-shaped pipe body 2.2; the arc-shaped pipe body 2.2 penetrates through the baffle 3 and is fixedly connected with the baffle. The outer wall of the post-processor mixer cylinder 1 is provided with a urea nozzle 5 for spraying urea into the post-processor mixer cylinder, and the urea nozzle 5 is communicated with the first pipe body 2.1 of the U-shaped mixing pipe 2. The first pipe body 2.1 of the U-shaped mixing pipe 2 comprises a plurality of cyclone plates 2.11, the cyclone plates 2.11 are enclosed into a pipe shape, and a gap is reserved between every two adjacent cyclone plates 2.11; the whirl plate 2.11 is a fold plate, and the cross section of the whirl plate 2.11 is in a fold line shape. A plurality of circulation holes 2.31 are formed in the second pipe body 2.3 of the U-shaped mixing pipe 2, and the plurality of circulation holes 2.31 are circumferentially arranged along the outer wall of the second pipe body 2.3 at intervals; the cyclone 4 is located on the same side of the baffle 3 as the second tube 2.3.

According to the invention, through the design of the U-shaped mixing pipe flow channel, the rotational flow plate is designed in the front section pipe of the U-shaped mixing pipe to enable the interaction of air flow and urea fog beams, the mixing of urea spray and exhaust gas is increased, and the spray angle of the urea fog beams is designed to prevent the urea fog beams from colliding with the wall too early, so that the risk of crystallization is avoided; the middle end of the U-shaped mixing pipe adopts an inclined design, so that the urea solution is prevented from being deposited; the rear section of the U-shaped mixing pipe is provided with a perforated pipe, so that the urea fog beam and the exhaust gas are fully mixed, and the requirement of ammonia uniformity in the mixer is met.

As shown in fig. 5, the baffle 3 is provided with a mounting hole 3.1 for the U-shaped mixing pipe 2 to pass through, and the U-shaped mixing pipe 2 and the mounting hole 3.1 of the baffle 3 are welded and fixed. The horizontal center line of baffle 3 and the axis of aftertreatment ware blender barrel 1 are the obtuse angle and arrange, U type hybrid tube 2 arranges with baffle 3 is perpendicular. Baffle 3 can be made by the metal material, and the horizontal central line of baffle 3 and the axis of aftertreatment ware mixer barrel 1 are the obtuse angle and arrange, and baffle 3 inclines to arrange in aftertreatment ware mixer barrel 1 promptly. The mounting hole 3.1 of the baffle 3 is eccentrically arranged, namely the mounting hole 3.1 is arranged above or below the central point of the baffle 3, thus being beneficial to the penetration of the U-shaped mixing pipe 2. The opening size of mounting hole 3.1 on the baffle 3 matches with the pipe diameter size of U type hybrid tube 2, makes things convenient for U type hybrid tube 2 to run through mounting hole 3.1 like this, is favorable to both to assemble each other, and U type hybrid tube 2 and the mounting hole 3.1 welded fastening of baffle 3, can make whole stable in structure like this.

As shown in fig. 6, the cyclone 4 includes a cyclone body 4.1, a plurality of through holes 4.2 are opened in the middle of the cyclone body 4.1, a plurality of cyclone holes 4.3 are provided around the outer circumference of the through holes 4.2, and each cyclone hole 4.3 is provided with a cyclone guide plate 4.4 arranged obliquely. According to the rear end of the efficient anti-crystallization SCR mixer, the urea fog drops and exhaust gas are fully mixed through the effect of the plurality of cyclones, and the ammonia mixing uniformity is improved. In this embodiment, four through holes 4.2 are opened in the middle of the swirler body 4.1, the four through holes 4.2 are arranged in two rows and two columns, and the opening shape of the through hole 4.2 is circular in this embodiment. The whirl hole 4.3 encircles the periphery that sets up at four through-holes 4.2, and in this embodiment, the periphery of four through-holes 4.2 is provided with two circles of whirl holes 4.3 around the ring, and first circle whirl hole 4.3 is provided with 6, 6 first circle whirl hole 4.3 interval evenly arranges. Every the slope is provided with whirl deflector 4.4 on the first circle whirl hole 4.3, and whirl deflector 4.4's one end and first circle whirl hole 4.3's one end fixed connection, the other end slope upwards extends the arrangement. The cyclone holes 4.3 are rectangular, the cyclone guide plates 4.4 are also rectangular, and the cyclone guide plates 4.4 and the planes of the cyclone holes 4.3 are arranged at acute angles. In this embodiment, the outer ring of the first circle of swirl holes 4.3 is further provided with a second circle of swirl holes 4.3, the number of the second circle of swirl holes 4.3 is 8, and the 8 swirl holes 4.3 are uniformly arranged at intervals. Each of the second circle first circle whirl hole 4.3 slope is provided with whirl deflector 4.4 on, the one end of whirl deflector 4.4 and the one end fixed connection of first circle whirl hole 4.3, and the other end slope upwards extends and arranges. The cyclone holes 4.3 are rectangular, the cyclone guide plates 4.4 are also rectangular, and the cyclone guide plates 4.4 and the planes of the cyclone holes 4.3 are arranged at acute angles.

The invention also provides an automobile, wherein the automobile is provided with a high-efficiency crystallization-preventing SCR mixer, the high-efficiency crystallization-preventing SCR mixer comprises a post-processor mixer cylinder 1, the inner cavity of the post-processor mixer cylinder 1 is provided with a U-shaped mixing pipe 2 and a baffle 3, and the U-shaped mixing pipe 2 is obliquely arranged in the inner cavity of the post-processor mixer cylinder 1; the baffle 3 is sleeved on the U-shaped mixing pipe 2, and the baffle 3 divides the inner cavity of the post-processor mixer cylinder 1 into a first cavity 1.1 and a second cavity 1.2; a plurality of cyclones 4 are also arranged in the second cavity 1.2. U type hybrid tube 2 has first body 2.1, arc body 2.2 and second body 2.3, arc body 2.2 sets up be used for communicating first body 2.1 with between the second body 2.3. The inner side end of the first pipe body 2.1 and the inner side end of the second pipe body 2.3 are in transitional connection through an arc-shaped pipe body 2.2, and the arc-shaped pipe body 2.2 penetrates through the baffle 3 and is fixedly connected with the baffle. The first pipe body 2.1 of the U-shaped mixing pipe 2 comprises a plurality of cyclone plates 2.11, the cyclone plates 2.11 are enclosed into a pipe shape, and a gap is reserved between every two adjacent cyclone plates 2.11; the whirl plate 2.11 is a fold plate, and the cross section of the whirl plate 2.11 is in a fold line shape. A plurality of circulation holes 2.31 are formed in the second pipe body 2.3 of the U-shaped mixing pipe 2, and the plurality of circulation holes 2.31 are circumferentially arranged along the outer wall of the second pipe body 2.3 at intervals; the cyclone 4 is located on the same side of the baffle 3 as the second tube 2.3. The outer wall of the post-processor mixer cylinder 1 is provided with a urea nozzle 5 for spraying urea into the post-processor mixer cylinder, and the urea nozzle 5 is communicated with the first pipe body 2.1 of the U-shaped mixing pipe 2. The baffle 3 is provided with a mounting hole 3.1 for the U-shaped mixing pipe 2 to penetrate through, and the U-shaped mixing pipe 2 is welded and fixed with the mounting hole 3.1 of the baffle 3. The horizontal center line of baffle 3 and the axis of aftertreatment ware blender barrel 1 are the obtuse angle and arrange, U type hybrid tube 2 arranges with baffle 3 is perpendicular. Baffle 3 can be made by the metal material, and the horizontal central line of baffle 3 and the axis of aftertreatment ware mixer barrel 1 are the obtuse angle and arrange, and baffle 3 inclines to arrange in aftertreatment ware mixer barrel 1 promptly. The mounting hole 3.1 of the baffle 3 is eccentrically arranged, namely the mounting hole 3.1 is arranged above or below the central point of the baffle 3, thus being beneficial to the penetration of the U-shaped mixing pipe 2. The opening size of mounting hole 3.1 on the baffle 3 matches with the pipe diameter size of U type hybrid tube 2, makes things convenient for U type hybrid tube 2 to run through mounting hole 3.1 like this, is favorable to both to assemble each other, and U type hybrid tube 2 and the mounting hole 3.1 welded fastening of baffle 3, can make whole stable in structure like this. The swirler 4 comprises a swirler body 4.1, a plurality of through holes 4.2 are formed in the middle of the swirler body 4.1, a plurality of swirl holes 4.3 are formed around the periphery of the through holes 4.2, and each swirl hole 4.3 is provided with a swirl guide plate 4.4 which is obliquely arranged. In this embodiment, four through holes 4.2 are opened in the middle of the swirler body 4.1, the four through holes 4.2 are arranged in two rows and two columns, and the opening shape of the through hole 4.2 is circular in this embodiment. The whirl hole 4.3 encircles the periphery that sets up at four through-holes 4.2, and in this embodiment, the periphery of four through-holes 4.2 is provided with two circles of whirl holes 4.3 around the ring, and first circle whirl hole 4.3 is provided with 6, 6 first circle whirl hole 4.3 interval evenly arranges. Every the slope is provided with whirl deflector 4.4 on the first circle whirl hole 4.3, and whirl deflector 4.4's one end and first circle whirl hole 4.3's one end fixed connection, the other end slope upwards extends the arrangement. The cyclone holes 4.3 are rectangular, the cyclone guide plates 4.4 are also rectangular, and the cyclone guide plates 4.4 and the planes of the cyclone holes 4.3 are arranged at acute angles. In this embodiment, the outer ring of the first circle of swirl holes 4.3 is further provided with a second circle of swirl holes 4.3, the number of the second circle of swirl holes 4.3 is 8, and the 8 swirl holes 4.3 are uniformly arranged at intervals. Each of the second circle first circle whirl hole 4.3 slope is provided with whirl deflector 4.4 on, the one end of whirl deflector 4.4 and the one end fixed connection of first circle whirl hole 4.3, and the other end slope upwards extends and arranges. The cyclone holes 4.3 are rectangular, the cyclone guide plates 4.4 are also rectangular, and the cyclone guide plates 4.4 and the planes of the cyclone holes 4.3 are arranged at acute angles. The mixer is designed in a connecting cavity between a DPF and an SCR of a vehicle, a U-shaped mixing pipe flow channel is designed, the rotational flow plate is designed in a front section pipe of the U-shaped mixing pipe to enable airflow and urea fog beams to interact, mixing of urea fog and exhaust is increased, and the spraying angle of the urea fog beams is designed to prevent the urea fog beams from colliding with the wall too early, so that the risk of crystallization is avoided; the middle end of the U-shaped mixing pipe adopts an inclined design, so that the urea solution is prevented from being deposited; the rear section of the U-shaped mixing pipe is provided with a perforated pipe, so that the urea fog beam and the exhaust gas are fully mixed, and the requirement of ammonia uniformity in the mixer is met.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.

Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims.

The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted.

Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.

It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.

Further, in constituting the component, although it is not explicitly described, it is understood that a certain error region is necessarily included. In describing positional relationships, for example, when positional sequences are described as being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps.

The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.

Claims

1. The utility model provides a high-efficient crystallization SCR blender that prevents which characterized in that: the mixing device comprises a post-processor mixer cylinder (1), wherein a U-shaped mixing pipe (2) and a baffle (3) are arranged in the inner cavity of the post-processor mixer cylinder (1), and the U-shaped mixing pipe (2) is obliquely arranged in the inner cavity of the post-processor mixer cylinder (1); the baffle (3) is sleeved on the U-shaped mixing pipe (2), and the baffle (3) divides the inner cavity of the post-processor mixer cylinder (1) into a first cavity (1.1) and a second cavity (1.2); a plurality of cyclones (4) are also arranged in the second cavity (1.2).

2. The high efficiency, crystallization-resistant SCR mixer of claim 1, wherein: u type hybrid tube (2) have first body (2.1), arc body (2.2) and second body (2.3), arc body (2.2) set up be used for between first body (2.1) and the second body (2.3) with both communicate.

3. The high efficiency, crystallization-resistant SCR mixer of claim 2, wherein: the first pipe body (2.1) is in transition connection with the second pipe body (2.3) through an arc-shaped pipe body (2.2), and the arc-shaped pipe body (2.2) penetrates through the baffle (3) and is fixedly connected with the baffle.

4. A high efficiency, anti-crystallization SCR mixer as defined in claim 3, wherein: the first pipe body (2.1) of the U-shaped mixing pipe (2) comprises a plurality of cyclone plates (2.11), the cyclone plates (2.11) are enclosed into a pipe shape, and a gap is reserved between every two adjacent cyclone plates (2.11); the swirl plate (2.11) is a folded plate, and the cross section of the swirl plate (2.11) is in a folded line shape.

5. The high efficiency, crystallization-resistant SCR mixer of claim 4, wherein: a plurality of circulation holes (2.31) are formed in a second pipe body (2.3) of the U-shaped mixing pipe (2), and the circulation holes (2.31) are circumferentially arranged at intervals along the outer wall of the second pipe body (2.3); the cyclone (4) and the second pipe body (2.3) are positioned on the same side of the baffle (3).

6. The high efficiency, crystallization-resistant SCR mixer of claim 5, wherein: the urea spraying device is characterized in that a urea nozzle (5) used for spraying urea into the urea spraying device is arranged on the outer wall of the post-processor mixer cylinder (1), and the urea nozzle (5) is communicated with a first pipe body (2.1) of the U-shaped mixing pipe (2).

7. The efficient anti-crystallization SCR mixer according to any one of claims 1 to 6, wherein: the horizontal center line of baffle (3) is arranged with the axis of aftertreatment ware mixer barrel (1) at an obtuse angle, U type hybrid tube (2) is arranged with baffle (3) is perpendicular.

8. The high efficiency, crystallization-resistant SCR mixer of claim 7, wherein: the baffle plate (3) is provided with a mounting hole (3.1) for the U-shaped mixing pipe (2) to penetrate through, and the U-shaped mixing pipe (2) is welded and fixed with the mounting hole (3.1) of the baffle plate (3).

9. The efficient anti-crystallization SCR mixer according to any one of claims 1 to 6, wherein: swirler (4) include swirler body (4.1), a plurality of through-hole (4.2) have been seted up at the middle part of swirler body (4.1), the peripheral of through-hole (4.2) is encircleed and is provided with a plurality of whirl hole (4.3), every be provided with the whirl deflector (4.4) that the slope was arranged on whirl hole (4.3).

10. An automobile, characterized in that: the automobile is provided with the efficient anti-crystallization SCR mixer as claimed in any one of claims 1 to 9.