CN113530650B

CN113530650B - Efficient SCR (Selective catalytic reduction) cylinder type mixer and vehicle adopting same

Info

Publication number: CN113530650B
Application number: CN202110865316.7A
Authority: CN
Inventors: 刘志辉; 欧阳凤霞; 张宏飞; 刘金; 李智
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-12-23
Anticipated expiration: 2041-07-29
Also published as: CN113530650A

Abstract

The invention discloses a high-efficiency SCR (Selective catalytic reduction) barrel mixer and a vehicle adopting the same, wherein a U-shaped mixing pipe and a baffle are arranged in an inner cavity of a post-processor mixer barrel of the high-efficiency SCR barrel mixer, a urea nozzle for spraying urea spray into the U-shaped mixing pipe is arranged on the post-processor mixer barrel, and the U-shaped mixing pipe is arranged in the direction inclined to the axis of the post-processor mixer barrel; the baffle is arranged in the inner cavity of the mixer cylinder of the post-processor; the U-shaped mixing pipe comprises a first pipe body, an intermediate pipe body and a second pipe body, wherein the first pipe body and the intermediate pipe body are arranged in a first cavity, the second pipe body is arranged in a second cavity, the intermediate pipe body is arranged between the first pipe body and the second pipe body and is communicated with the first pipe body and the second pipe body, and the second pipe body is a double-layer porous pipe. According to the invention, the U-shaped mixing pipe is designed in the connecting cavity between the DPF and the SCR to promote the atomization of the urea water solution, and the second pipe body of the U-shaped mixing pipe is a double-layer porous pipe, so that the urea fog beam and the exhaust gas are further fully mixed, and the requirement of ammonia uniformity in the mixer is met.

Description

Efficient SCR (Selective catalytic reduction) cylinder type mixer and vehicle adopting same

Technical Field

The invention relates to the technical field of vehicle denitration, in particular to a high-efficiency SCR (selective catalytic reduction) cylinder type mixer and a vehicle adopting the same.

Background

Selective Catalytic Reduction (SCR) refers to Selective Catalytic Reduction of NO in flue gas using a reducing agent (e.g., NH3, liquid ammonia, urea) under the action of a catalyst _x Reacting and generating nontoxic and pollution-free N ₂ And H ₂ And (O). Automotive exhaust systems include an injection system that injects a Diesel Exhaust Fluid (DEF) or a solution of a reductant, such as urea, and water upstream of an SCR catalyst (selective catalytic reduction catalyst). A mixer is positioned upstream of the SCR catalyst and mixes the engine exhaust gases and the urea conversion products.

The Chinese patent with the granted publication number of CN 107530655B discloses a full-rotating mixer, which comprises: 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. .

The Chinese patent with publication number CN 108331643A discloses a compact DOC-DPF-SCR post-treatment device, which is integrally of a U-shaped structure 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, and the opening is used for the inlet of gas to be treated. The whole is U type structure, and from one end to the other end in proper order including DOC-DPF unit, air intake mixer and the SCR unit that is connected, just DOC-DPF unit is equipped with opening up, the opening is used for pending gaseous entering. The interface with the opening is swivelling joint, and can pass through to rotate the subassembly that admits 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 109184863A discloses an SCR mixing system and an SCR mixer thereof, which include an SCR carrier and a mixer housing with a urea nozzle, and further include: 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: 1. the aftertreatment mixer design is not compact enough, resulting in a larger overall size of the vehicle aftertreatment, increased cost and occupying larger vehicle chassis mounting controls; 2. the short mixing distance of the mixer easily causes urea to enter the rear SCR carrier without being fully mixed in the mixer, thereby causing the blockage of the carrier; 3. the urea solution in the mixer is still at risk of hitting the walls in the early stages of the urea spray, leading to a risk of clogging of the urea crystals.

Disclosure of Invention

The invention aims to provide a high-efficiency SCR drum mixer and a vehicle adopting the same, which can reduce the risk of urea spray crystallization and promote the mixing uniformity of urea and gas.

In order to achieve the purpose, the invention adopts the technical scheme that: the weight of the fender bracket assembly can be reduced while the mounting reliability of the fender is ensured.

In order to achieve the above purpose, on one hand, the high-efficiency SCR drum mixer designed by the present invention includes a post-processor mixer drum, the inner cavity of the post-processor mixer drum is provided with a U-shaped mixing pipe and a baffle, the post-processor mixer drum is provided with a urea nozzle for spraying urea spray into the U-shaped mixing pipe, and the U-shaped mixing pipe is arranged in the inner cavity of the post-processor mixer drum in an inclined manner to the axial direction of the post-processor mixer drum; the baffle is sleeved on the U-shaped mixing pipe and is arranged in the inner cavity of the post-processor mixer cylinder body so as to divide the inner cavity of the post-processor mixer cylinder body into a first cavity and a second cavity; the U-shaped mixing pipe comprises a first pipe body arranged in the first cavity, a middle pipe body and a second pipe body arranged in the second cavity, the middle pipe body is arranged between the first pipe body and the second pipe body and is communicated with the first pipe body and the second pipe body, urea spray of the urea nozzle enters an opening at one end of the first pipe body, and the second pipe body is a double-layer perforated pipe.

In one embodiment, the second tubular body has an inner tubular body and an outer tubular body that are coaxially disposed, the second tubular body having an axis that is perpendicular to the axis of the aftertreatment mixer cartridge and parallel to the axis of the first tubular body; a plurality of inner flow through holes are uniformly formed in the pipe wall of the inner pipe body so as to communicate the interior of the inner pipe body with the interior of the outer pipe body; a plurality of outflow through holes are uniformly formed in the pipe wall of the outer pipe body so as to communicate the inside and the outside of the outer pipe body.

In one embodiment, one end of the inner tube body is connected with one end of the middle tube body, the outer tube body is coaxially arranged outside the inner tube body, and the inner flow through holes and the outer flow through holes are circumferentially arranged at intervals along the outer wall.

In one embodiment, the baffle is in a plane that is neither parallel to nor perpendicular to the axis of the aftertreatment mixer barrel, and the baffle is in a plane that is parallel to the axis of the first and second tubes.

In one embodiment, the baffle is a metal plate and is provided with a mounting hole for the intermediate pipe to pass through, the size of the mounting hole is equal to the pipe diameter of the intermediate pipe body, and the intermediate pipe body is welded and fixed with the baffle.

In one embodiment, the first pipe body comprises a plurality of spinning disks, the spinning disks surround the axis direction of the first pipe body to form a pipe shape, and a gap is reserved between every two adjacent spinning disks; the spinning disk is the folded plate, the spinning disk perpendicular to the cross-section of first body axis direction is the dogleg.

In one embodiment, a swirler is further disposed within the second chamber and is secured downstream of the second tube perpendicular to the axis of the aftertreatment mixer barrel.

In one embodiment, the swirler comprises a swirler body, a plurality of through holes are formed in the middle of the swirler body, a plurality of swirl holes (4.3) are formed around the periphery of the through holes, and each swirl hole is provided with a swirl guide plate which is obliquely arranged.

In order to achieve the above objects, in another aspect, the present invention is directed to a vehicle, the efficient SCR cartridge mixer described above, installed in an exhaust system of the vehicle.

In one embodiment, the first cavity of the aftertreatment mixer cartridge is communicated to an engine exhaust of the vehicle.

The invention has the beneficial effects that: in the efficient SCR barrel mixer and the vehicle adopting the same, the U-shaped mixing pipe is designed in the connecting cavity between the DPF and the SCR to promote the atomization of the urea water solution, and the second pipe body of the U-shaped mixing pipe is a double-layer porous pipe, so that the urea fog beam and the exhaust gas are further fully mixed, and the requirement on the uniformity of ammonia in the mixer is met; the spraying angle of the urea fog beam from the urea nozzle is designed, so that the urea fog beam can be prevented from colliding with the wall too early, and the risk of crystallization is avoided; has the advantages of simple structure, good atomization effect of the urea aqueous solution, uniform gas mixing and the like.

Drawings

Specific embodiments of the present invention will now be described in detail below with reference to the accompanying drawings. It is to be understood that the drawings are not necessarily to scale and that the drawings are merely illustrative of exemplary embodiments of the disclosure and are not to be considered limiting of the scope of the disclosure. In the drawings:

FIG. 1 is a schematic perspective view of a high efficiency SCR cartridge mixer in accordance with a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the high efficiency SCR barrel mixer of FIG. 1 taken along a vertical section through an axis; the three-dimensional structure schematic diagram of the fender supporting rod;

FIG. 3 is a cross-sectional view of the high efficiency SCR barrel mixer of FIG. 1 taken in a horizontal cross-section through an axis; FIG. 4 is a perspective view of the high efficiency SCR cartridge mixer of FIG. 1 with the aftertreatment mixer cartridge removed; (ii) a

FIG. 5 is a cross-sectional view of the high efficiency SCR cartridge mixer of FIG. 2 with the aftertreatment mixer cartridge removed;

FIG. 6 is a right side view of the high efficiency SCR cartridge mixer of FIG. 1;

FIG. 7 is a left side view of the high efficiency SCR cartridge mixer of FIG. 1;

FIG. 8 is an enlarged perspective view of the baffle of FIG. 4;

FIG. 9 is a perspective view of a swirler in a high efficiency SCR barrel mixer in accordance with another preferred embodiment of the present invention.

The elements in the figures are numbered as follows: a mixer 100; a post-processor mixer cartridge 1 (wherein, a first cavity 1.1, a second cavity 1.2); a U-shaped mixing pipe 2 (wherein, a first pipe body 2.1, a middle pipe body 2.2, a second pipe body 2.3, a spinning disk 2.11, an inner pipe body 2.31, an outer pipe body 2.32, an inner flow through hole 2.311, an outer flow through hole 2.321); a baffle 3 (wherein, a mounting hole 3.1); a swirler 4 (wherein, a swirler body 4.1, a through hole 4.2, a swirl hole 4.3 and a swirl guide plate 4.4); a urea nozzle 5.

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.

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 singular but may also refer to 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 "on.. Above", "over.. Under." and "next", unless a word or term such as "exactly" or "directly" is used, cases where there is no contact or contact therebetween may be included. 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.

According to the efficient SCR cylinder type mixer and the vehicle adopting the same, the mixer is designed in a connecting cavity between a DPF (Diesel Particulate Filter, also called a Diesel Particulate trap regenerator) and an SCR of the vehicle, a cyclone is designed in a front-section pipe of a U-shaped tank through a U-shaped flow channel design, so that interaction between airflow and urea mist beams is realized, mixing of urea spraying and exhaust is increased, and the urea spraying angle is designed to reduce the early collision of the urea mist beams against the wall, so that the risk of crystallization is avoided; the middle section of the U-shaped pipe adopts an inclined design to avoid the deposition of urea solution; the rear section of the U-shaped pipe is provided with a double-layer perforated 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 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.

Referring to fig. 1 to 3, the high efficiency SCR drum mixer 100 of the present invention includes an aftertreatment mixer drum 1, wherein the aftertreatment mixer drum 1 is a hollow straight drum structure. The inner cavity of the post-processor mixer cylinder 1 is provided with a U-shaped mixing pipe 2 and a baffle 3,U. The mixing pipe 2 and the baffle 3 are arranged in the inner cavity of the post-processor mixer cylinder 1 obliquely to the axial direction 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 number of cyclones 4 (as shown in figure 9) may also be provided in the second chamber 1.2. The outer wall of the post-processor mixer cylinder 1 is provided with a urea nozzle 5 for spraying urea spray into the post-processor mixer cylinder, and the urea nozzle 5 sprays the urea spray into an opening at one end of the U-shaped mixing pipe 2.

Please refer to fig. 4, 5, 6 and 7,U, the mixing tube 2 is U-shaped as a whole, and includes a first tube 2.1, an intermediate tube 2.2 and a second tube 2.3 connected in sequence, wherein the intermediate tube 2.2 is disposed between the first tube 2.1 and the second tube 2.3 for communicating the two. The cross sections of the first pipe body 2.1, the middle pipe body 2.2 and the second pipe body 2.3 are all circular structures. First body 2.1 is located first cavity 1.1, and second body 2.3 is located first cavity 1.2, and first body 2.1 and second body 2.3 pass baffle 3 transitional coupling through middle body 2.2, and middle body 2.2 runs through baffle 3 and both ends respectively with first body 2.1, second body 2.3 fixed connection. The urea nozzle 5 is communicated with the upper end opening of the first pipe body 2.1 of the U-shaped mixing pipe 2 and sprays urea spray inwards.

The axis of the first pipe body 2.1 of the U-shaped mixing pipe 2 is perpendicular to the axis direction of the mixer barrel body 1 of the postprocessor, and comprises a plurality of spinning disks 2.11 arranged around the axis of the first pipe body, the spinning disks 2.11 are spaced to form a pipe shape, and a gap is reserved between every two adjacent spinning disks 2.11. More specifically, spinning disk 2.11 is the zigzag board, and spinning disk 2.11 is the dogleg in the cross-section of the first body 2.1's of perpendicular to axis direction to the exhaust that will get into in the first cavity 1.1 gets into in the first body 2.1 and mixes with the urea spraying from the clearance between two adjacent spinning disks 2.11.

The second tube 2.3 of the U-shaped mixing tube 2 has an inner tube 2.31 and an outer tube 2.32 arranged coaxially, and the axis of the second tube 2.3 is perpendicular to the axial direction of the post-processor mixer barrel 1 and parallel to the axis of the first tube 2.1. The inner tube 2.31 is connected to one end of the intermediate tube 2.2, and the outer tube 2.32 is coaxially disposed outside the inner tube 2.31. The inner pipe body 1.31 is provided with inner flow through holes 2.311 on the pipe wall to communicate the inside of the inner pipe body 2.31 with the inside of the outer pipe body 2.32. The wall of the outer tube 2.32 is uniformly provided with outflow through holes 2.321 for communicating the inside and outside of the outer tube 2.32. The inner flow through holes 2.311 and the outer flow through holes 2.321 are arranged along the circumferential direction of the outer wall at intervals, so that the inner and outer of the second pipe body 2.3 can be fully mixed for multiple times.

As shown in fig. 8, the baffle 3 may be made of metal, the baffle 3 is provided with a mounting hole 3.1 for the U-shaped mixing tube 2 to pass through, and the U-shaped mixing tube 2 (the intermediate tube body 2.2) is welded and fixed to the mounting hole 3.1 of the baffle 3. The plane in which the baffles 3 lie is not parallel and perpendicular to the axis of the aftertreatment mixer cylinder 1, i.e. the baffles 3 are arranged obliquely within the aftertreatment mixer cylinder 1. The plane of the baffle 3 is parallel to the axes of the first tube body 1.1 and the second tube body 1.2 of the U-shaped mixing tube 2, i.e. the baffle 3 is arranged parallel to the first tube body 1.1 and the second tube body 1.2. 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 the mounting hole 3.1 on the baffle 3 matches with the pipe diameter size of the middle pipe body 2.2, so that the middle pipe body 2.2 can penetrate through the mounting hole 3.1 conveniently, mutual assembly between the two is facilitated, the middle pipe body 2.2 is fixed with the mounting hole 3.1 of the baffle 3 in a welding mode, and the whole structure is stable.

As shown in fig. 9, a cyclone 4 may be provided in the second chamber 2.2 of the aftertreatment mixer cartridge 1, the cyclone 4 being fixed downstream of the second duct 2.3 in a manner perpendicular to the axis of the aftertreatment mixer cartridge 1. Swirler 4 includes swirler body 4.1, and a plurality of through-hole 4.2 has been seted up at swirler body 4.1's middle part, through-hole 4.2's peripheral encircleing is provided with a plurality of whirl hole 4.3, is provided with the whirl deflector 4.4 that the slope was arranged on every whirl hole 4.3. The rear end of the high-efficiency SCR cylinder mixer fully mixes urea fog drops with exhaust gas by designing the action of the plurality of cyclones, so that the mixing uniformity of ammonia is improved.

In the illustrated embodiment, four through holes 4.2 are formed 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 swirl holes 4.3 are rectangular, the swirl guide plate 4.4 is also rectangular, and the swirl guide plate 4.4 and the plane of the swirl holes 4.3 are arranged at an acute angle. 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 a vehicle, wherein the vehicle is provided with the efficient SCR cartridge mixer 100, the efficient SCR cartridge mixer 100 comprises a post-processor mixer cylinder 1, and the post-processor mixer cylinder 1 is of a hollow straight cylinder structure. The inner cavity of the post-processor mixer cylinder 1 is provided with a U-shaped mixing pipe 2 and a baffle 3,U. The mixing pipe 2 and the baffle 3 are arranged in the inner cavity of the post-processor mixer cylinder 1 obliquely to the axial direction 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 number of cyclones 4 (as shown in figure 9) may also be provided in the second chamber 1.2. The outer wall of the post-processor mixer cylinder 1 is provided with a urea nozzle 5 for spraying urea spray into the post-processor mixer cylinder, and the urea nozzle 5 sprays the urea spray into an opening at one end of the U-shaped mixing pipe 2.

The U-shaped mixing pipe 2 is integrally U-shaped, and has a first pipe body 2.1, a middle pipe body 2.2 and a second pipe body 2.3 which are connected in sequence, and the middle pipe body 2.2 is arranged between the first pipe body 2.1 and the second pipe body 2.3 and is used for communicating the first pipe body and the second pipe body. The cross sections of the first pipe body 2.1, the middle pipe body 2.2 and the second pipe body 2.3 are all circular structures. First body 2.1 is located first cavity 1.1, and second body 2.3 is located first cavity 1.2, and first body 2.1 and second body 2.3 pass baffle 3 transitional coupling through middle body 2.2, and middle body 2.2 runs through baffle 3 and both ends respectively with first body 2.1, second body 2.3 fixed connection. The urea nozzle 5 is communicated with the upper end opening of the first pipe body 2.1 of the U-shaped mixing pipe 2 and sprays urea spray inwards.

The axis of the first pipe body 2.1 of the U-shaped mixing pipe 2 is perpendicular to the axis direction of the mixer barrel body 1 of the postprocessor, and comprises a plurality of spinning disks 2.11 arranged around the axis of the first pipe body, the spinning disks 2.11 are spaced to form a pipe shape, and a gap is reserved between every two adjacent spinning disks 2.11. More specifically, spinning disk 2.11 is the zigzag board, and spinning disk 2.11 is dogleg at the cross-section of the first body 2.1's of perpendicular to axis direction to the exhaust that will get into in the first cavity 1.1 gets into in the first body 2.1 and mixes with the urea spraying from the clearance between two adjacent spinning disks 2.11.

The second tube 2.3 of the U-shaped mixing tube 2 has an inner tube 2.31 and an outer tube 2.32 arranged coaxially, and the axis of the second tube 2.3 is perpendicular to the axial direction of the post-processor mixer barrel 1 and parallel to the axis of the first tube 2.1. The inner tube body 2.31 is connected with one end of the middle tube body 2.2, and the outer tube body 2.32 is coaxially arranged outside the inner tube body 2.31. The pipe wall of the inner pipe body 1.31 is evenly provided with inner flow through holes 2.311 to communicate the inside of the inner pipe body 2.31 with the inside of the outer pipe body 2.32. The wall of the outer tube 2.32 is uniformly provided with outflow through holes 2.321 for communicating the inside and outside of the outer tube 2.32. The inner flow through holes 2.311 and the outer flow through holes 2.321 are arranged along the circumferential direction of the outer wall at intervals, so that the inner and outer of the second pipe body 2.3 can be fully mixed for multiple times.

The baffle 3 can be made of metal materials, a mounting hole 3.1 for the U-shaped mixing pipe 2 to penetrate through is arranged on the baffle 3, and the U-shaped mixing pipe 2 (the middle pipe body 2.2) is welded and fixed with the mounting hole 3.1 of the baffle 3. The plane in which the baffles 3 lie is not parallel and perpendicular to the axis of the aftertreatment mixer cylinder 1, i.e. the baffles 3 are arranged obliquely within the aftertreatment mixer cylinder 1. The plane of the baffle 3 is parallel to the axes of the first tube 1.1 and the second tube 1.2 of the U-shaped mixing tube 2, i.e. the baffle 3 is arranged parallel to the first tube 1.1 and the second tube 1.2. 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 the mounting hole 3.1 on the baffle 3 matches with the pipe diameter size of the middle pipe body 2.2, so that the middle pipe body 2.2 can conveniently run through the mounting hole 3.1, mutual assembly of the two is facilitated, and the middle pipe body 2.2 is welded and fixed with the mounting hole 3.1 of the baffle 3, so that the whole structure is stable.

In the high efficiency SCR cartridge mixer 100 described above, urea spray is injected into the aftertreatment mixer cartridge 1 through the urea nozzle 5 and enters the U-shaped mixing pipe 2 through the upper end opening of the first pipe 2.1. Waste gas entering the first cavity 1.1 from one side of the post-processor mixer cylinder 1 is blocked by the baffle 3 and is gathered in the first cavity 1.1. Waste gas in the first cavity 1.1 enters the first pipe body 2.1 through the clearance between two adjacent spinning disks 2.11 with the mode of whirl inside, and urea spraying meets the waste gas of high temperature and is atomized rapidly and mixes with waste gas. The swirl vanes 2.11 cause the air stream to interact with the urea spray beam, increasing the mixing of the urea spray and the exhaust. By designing the spray angle of the urea mist from the urea nozzle 5, the urea mist can be prevented from prematurely hitting the wall, thereby avoiding the risk of crystallization. The middle pipe body 2.2 of the middle section of the U-shaped mixing pipe is obliquely arranged, so that the urea solution is prevented from being deposited. The second pipe body 2.3 at the rear section of the U-shaped pipe is a double-layer porous pipe, so that the urea fog beam and the exhaust gas are further fully mixed, and the requirement on uniformity of ammonia in the mixer is met.

In summary, compared with the prior art, in the high-efficiency SCR barrel mixer and the vehicle adopting the mixer, the mixer promotes the atomization of the urea aqueous solution, promotes the atomization of the urea aqueous solution entering the mixer and fully mixes the urea aqueous solution with the exhaust gas, can effectively prevent the deposition and crystallization of the urea, and has the advantages of simple structure, good atomization effect of the urea aqueous solution, uniform gas mixing and the like. In the high-efficiency SCR cylinder type mixer and the vehicle adopting the mixer, the mixer has the advantages of simple design structure, easy processing and forming, lower cost and lighter weight, meets the requirements of the future post-treatment system of the automobile industry, and has practical value.

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.

The above-described embodiments of the present invention only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A high efficiency SCR drum mixer, characterized by: the urea spraying 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), a urea nozzle (5) for spraying urea spray into the U-shaped mixing pipe (2) is arranged on the post-processor mixer cylinder (1), and the U-shaped mixing pipe (2) is inclined to the axial direction of the post-processor mixer cylinder (1) and is 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 is arranged in the inner cavity of the post-processor mixer cylinder (1) to divide the inner cavity of the post-processor mixer cylinder (1) into a first cavity (1.1) and a second cavity (1.2); the U-shaped mixing pipe (2) comprises a first pipe body (2.1) arranged in the first cavity (1.1), an intermediate pipe body (2.2) and a second pipe body (2.3) arranged in the second cavity (1.2), the intermediate pipe body (2.2) is arranged between the first pipe body (2.1) and the second pipe body (2.3) and communicated with the first pipe body (2.1) and the second pipe body (2.3), urea spray of the urea nozzle (5) enters an opening at one end of the first pipe body (2.1), and the second pipe body (2.3) is a double-layer porous pipe; the second tube (2.3) has an inner tube (2.31) and an outer tube (2.32) arranged coaxially, one end of the inner tube (2.31) being connected to one end of the intermediate tube (2.2), the outer tube (2.32) being arranged coaxially outside the inner tube (2.31).

2. A high efficiency SCR cartridge mixer as defined in claim 1, wherein: the axis of the second tube (2.3) is perpendicular to the axis of the post-processor mixer drum (1) and parallel to the axis of the first tube (2.1); a plurality of inner flow through holes (2.311) are uniformly formed in the pipe wall of the inner pipe body (2.31) so as to communicate the inside of the inner pipe body (2.31) with the inside of the outer pipe body (2.32); the pipe wall of the outer pipe body (2.32) is uniformly provided with a plurality of outer flow through holes (2.321) so as to communicate the inside and the outside of the outer pipe body (2.32).

3. A high efficiency SCR cartridge mixer as defined in claim 2, wherein: the inner flow through holes (2.311) and the outer flow through holes (2.321) are arranged at intervals along the circumferential direction of the outer wall.

4. A high efficiency SCR cartridge mixer as defined in claim 1, wherein: the plane of the baffle (3) is not parallel or perpendicular to the axis of the post-processor mixer cylinder (1), and the plane of the baffle (3) is parallel to the axes of the first pipe body (2.1) and the second pipe body (2.3).

5. A high efficiency SCR cartridge mixer as defined in claim 4, wherein: the baffle (3) is a metal plate and is provided with a mounting hole (3.1) for the middle pipe body (2.2) to run through, the size of the mounting hole (3.1) is equal to the pipe diameter of the middle pipe body (2.2), and the middle pipe body (2.2) is welded and fixed with the baffle (3).

6. A high efficiency SCR cartridge mixer as defined in claim 1, wherein: the first pipe body (2.1) comprises a plurality of spinning disks (2.11), the spinning disks (2.11) surround the axial direction of the first pipe body (2.1) to form a pipe shape, and a gap is reserved between every two adjacent spinning disks (2.11); the spinning disk (2.11) is a folded plate, and the spinning disk (2.11) is perpendicular to the cross section of the axis direction of the first pipe body (2.1) is in a folded line shape.

7. A high efficiency SCR cartridge mixer as defined in claim 6, wherein: a swirler (4) is further arranged in the second cavity (1.2), and the swirler (4) is fixed at the downstream of the second tube (2.3) in a mode of being perpendicular to the axis of the post-processor mixer barrel (1).

8. A high efficiency SCR cartridge mixer as defined in claim 7, 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 periphery 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).

9. A vehicle, characterized in that: a high efficiency SCR cartridge mixer (100) comprising any one of claims 1 to 8, the high efficiency SCR cartridge mixer (100) being installed in an exhaust system of the vehicle.

10. The vehicle according to claim 9, characterized in that: the first cavity (1.1) of the aftertreatment mixer cartridge (1) is connected to an engine exhaust of the vehicle.