CN114382571A

CN114382571A - Layering crushing urea mixing device

Info

Publication number: CN114382571A
Application number: CN202210096796.XA
Authority: CN
Inventors: 张旭; 陈增响; 何伟娇; 周稳超; 易军
Original assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Current assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-04-22
Anticipated expiration: 2042-01-27
Also published as: CN114382571B

Abstract

The application discloses a layered crushing urea mixing device which comprises a barrel, a supporting plate, a cyclone tube, a perforated tube, a crushing plate and a blocking cover, wherein a first mounting hole is formed in the barrel, a second mounting hole is formed in the supporting plate, and the cyclone tube is communicated with the first mounting hole and the second mounting hole; the support plate divides the interior of the cylinder into an air inlet cavity and an air outlet cavity, tail gas can enter the cyclone tube through the air inlet after entering the air inlet cavity, and urea solution enters the cylinder through the cyclone tube, can contact with the tail gas and passes through the perforated tube, the crushing plate and the plugging cover along with the tail gas; the perforated pipe is provided with a through hole which can crush urea; the crushing plate and the blocking cover can greatly improve the atomization level of urea and reduce the risk of urea crystallization.

Description

Layering crushing urea mixing device

Technical Field

The application relates to the technical field of automobile exhaust treatment devices, in particular to a layered crushing urea mixing device.

Background

The automobile exhaust contains harmful gases such as CO (carbon monoxide), HC (hydrocarbon) and NOx (nitrogen oxide), and the automobile exhaust needs to be purified to protect the environment and human bodies.

Selective Catalytic Reduction (SCR) is a treatment process for NOx in automobile exhaust. Specifically, after entering the SCR device, the exhaust gas is sprayed with a reducing agent ammonia or urea, and NOx is reduced to nitrogen and oxygen under the action of a catalyst.

Among the conventional SCR equipment, for guaranteeing the mixed effect of urea solution and tail gas, can set up the blender before the SCR carrier, the main function of blender lets tail gas and urea granule homogeneous mixing, breaks into littleer urea granule with urea nozzle spun urea solution, prevents the urea aqueous solution crystallization, and the while is with atomizing ammonia (urea hydrolysis production ammonia) evenly takes to SCR carrier end face to improve SCR's conversion efficiency. How to reduce the low-temperature crystallization of urea and evenly bring ammonia to the end face of an SCR carrier is a key link in the SCR technology. The existing structure has the problems of easy crystallization of urea, uneven ammonia mixing, overlarge exhaust back pressure of the mixer structure, overlarge size of the mixer and the like.

Disclosure of Invention

The utility model aims at overcoming the not enough that exists among the prior art, provides a broken urea mixing arrangement in layering.

In order to realize above technical objective, the application provides a broken urea mixing arrangement of layering includes: the barrel is provided with a first mounting hole; the supporting plate is arranged in the cylinder body and divides the interior of the cylinder body into an air inlet cavity and an air outlet cavity, and a second mounting hole is formed in the supporting plate; the cyclone tube is communicated with the first mounting hole and the second mounting hole, a plurality of air inlets are formed in the cyclone tube and are arranged at intervals along the circumferential direction, and the air inlets are positioned in the air inlet cavity; the porous pipe is arranged in the air outlet cavity and communicated with the cyclone pipe, and a plurality of through holes are formed in the porous pipe; the crushing plate is arranged in the porous pipe, a circulation hole and a plurality of crushing holes are formed in the crushing plate, the plurality of crushing holes are arranged around the circulation hole, and the aperture of the circulation hole is larger than that of the crushing holes; the blanking cover is arranged at the downstream of the crushing plate and comprises a cover part which is just opposite to the circulation hole.

Furthermore, a plurality of auxiliary flow holes are formed on the cover part.

Furthermore, the plug cover also comprises a branch part which is arranged on the side edge of the cover part; the blanking cover is arranged in the porous pipe, and the branch part is used for contacting the inner wall of the porous pipe.

Further, the circulation hole is a circular hole, the cover part is disc-shaped, and the outer diameter of the cover part is not larger than the aperture of the circulation hole.

Furthermore, at least two rows of through holes are formed in the perforated pipe, each row comprises a plurality of through holes, and the through holes in each row are arranged at intervals along the circumferential direction; the crushing plate and the blocking cover are arranged in the perforated pipe at intervals, and at least one row of through holes are arranged between the crushing plate and the blocking cover at intervals.

Further, the through hole is a kidney-shaped hole.

Further, the pipe diameter of the perforated pipe is larger than that of the cyclone pipe.

Furthermore, the supporting plate is also provided with an air blowing hole; after the tail gas enters the air inlet cavity, part of the tail gas enters the cyclone tube through the air inlet hole, and the other part of the tail gas enters the air outlet cavity through the air blowing hole.

Further, the support plate includes: the air blowing hole is formed in the first connecting plate; the second mounting hole is formed in the mounting plate; the mounting plate is connected with the first connecting plate and the second connecting plate; wherein, the side that first connecting plate and second connecting plate do not link to each other with the mounting panel is circular-arc.

Furthermore, the layered crushing urea mixing device also comprises a rotational flow plate which is arranged in the air outlet cavity; the rotational flow plate is provided with a plurality of rotational flow openings which are arranged at intervals along the circumferential direction; the cyclone plate is also provided with a middle opening, and the middle opening is arranged among the plurality of cyclone openings.

The application provides a layered crushing urea mixing device which comprises a barrel, a supporting plate, a cyclone tube, a perforated tube, a crushing plate and a blocking cover, wherein a first mounting hole is formed in the barrel, a second mounting hole is formed in the supporting plate, and the cyclone tube is communicated with the first mounting hole and the second mounting hole; the support plate divides the interior of the cylinder into an air inlet cavity and an air outlet cavity, tail gas can enter the cyclone tube through the air inlet after entering the air inlet cavity, and urea solution enters the cylinder through the cyclone tube, can contact with the tail gas and passes through the perforated tube, the crushing plate and the plugging cover along with the tail gas; the perforated pipe is provided with a through hole which can crush urea; the crushing plate and the blocking cover can greatly improve the atomization level of urea and reduce the risk of urea crystallization.

Drawings

FIG. 1 is a schematic perspective view of a layered urea crushing and mixing device provided in the present application;

FIG. 2 is a front sectional view of the urea mixing device of FIG. 1;

FIG. 3 is a sectional view of the urea layering and crushing mixing device in FIG. 1 in another direction;

FIG. 4 is an exploded view of the support plate, the cartridge and the swirl plate of FIG. 1;

FIG. 5 is a schematic diagram of the cyclone tube of FIG. 1;

fig. 6 is an exploded view of the perforated pipe, breaker plate and closure of fig. 1.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The application provides broken urea mixing arrangement of layering includes: the cylinder 10 is provided with a first mounting hole 11; the support plate 20 is arranged in the cylinder 10 and divides the interior of the cylinder 10 into an air inlet cavity and an air outlet cavity, and the support plate 20 is provided with a second mounting hole 21; the cyclone tube 30 is communicated with the first mounting hole 11 and the second mounting hole 21, a plurality of air inlets 31 are formed in the cyclone tube 30, the plurality of air inlets 31 are arranged at intervals along the circumferential direction, and the air inlets 31 are positioned in the air inlet cavity; the perforated pipe 40 is arranged in the air outlet cavity and communicated with the cyclone pipe 30, and a plurality of through holes 41 are formed in the perforated pipe 40; the crushing plate 50 is arranged in the perforated pipe 40, a flow hole 51 and a plurality of crushing holes 52 are formed in the crushing plate 50, the plurality of crushing holes 52 are arranged around the flow hole 51, and the aperture of the flow hole 51 is larger than that of the crushing holes 52; and a cap 60 provided downstream of the breaker plate 50, the cap 60 including a cap portion 61, the cap portion 61 facing the flow hole 51.

Specifically, referring to fig. 1 and 2, in the embodiment shown in fig. 2, the left side of the cylinder 10 is an air inlet end, and the right side of the cylinder 10 is an air outlet end, and the upper side of the cylinder 10 is provided with a first mounting hole 11; tail gas enters the cylinder body 10 from left to right through the air inlet end, and urea enters the cylinder body 10 from top to bottom through the first mounting hole 11.

With reference to fig. 2, in the illustrated embodiment, the supporting plate 20 is disposed in the cylinder 10, such that an air inlet cavity is formed on the left side of the cylinder 10, an air outlet cavity is formed on the right side of the cylinder 10, the first mounting hole 11 faces the air inlet cavity and communicates with the cyclone tube 30, and a portion of the cyclone tube 30 having the air inlet 31 is located in the air inlet cavity.

Since the support plate 20 can obstruct the circulation of the exhaust gas, the exhaust gas enters the air inlet cavity of the barrel 10 and then enters the cyclone tube 30 through the air inlet hole 31.

Because first mounting hole 11 communicates cyclone tube 30, urea can get into cyclone tube 30 when passing through first mounting hole 11. Thus, in the swirl tube 30, the exhaust gas and urea come into contact with each other and can be mixed; further, tail gas and urea can pass through cyclone 30, get into perforated pipe 40, through perforated pipe 40, breaker plate 50 and blanking cover 60, and tail gas and urea get into the air outlet cavity to can finally leave barrel 10 through the end of giving vent to anger.

With continued reference to fig. 1 and 2, in the illustrated embodiment, the first mounting hole 11 and the second mounting hole 21 cooperate to realize the mounting of the swirl tube 30, and the swirl tube 30 is inserted into the first mounting hole 11 and the second mounting hole 21. Along the tube length direction of the cyclone tube 30, the cyclone tube 30 comprises an inlet end and an outlet end, the inlet end of the cyclone tube 30 penetrates through the first mounting hole 11, and urea can enter the cyclone tube 30 through the inlet end; the exit end of swirl tube 30 passes second mounting hole 21, can guide tail gas and urea to get into the air outlet chamber. Meanwhile, the portion of the cyclone tube 30, which is provided with the air inlet 31, is located in the air inlet cavity, and the tail gas entering the cylinder 10 can enter the cyclone tube 30 through the air inlet 31.

Referring to fig. 2 and 5, the exhaust gas in the air inlet chamber surrounds the swirl tube 30 and enters the swirl tube 30 through each air inlet hole 31. Because a plurality of air inlets 31 on the cyclone tube 30 pipe wall are arranged along circumference, the tail gas can form rotatory air current in cyclone tube 30. Meanwhile, since the aperture of the air inlet hole 31 is smaller than the pipe diameter of the cylinder 10, when the exhaust gas enters the air inlet hole 31 under a certain exhaust gas flow rate, the flow velocity of the exhaust gas will increase due to the reduction of the flow area. Therefore, a high-speed rotating airflow is formed in the cyclone tube 30, the airflow can wrap the urea and is beneficial to mixing of the urea and the airflow, the urea can be guided to flow to the perforated tube 40, and the risk of crystallization of the urea in the cyclone tube 30 is reduced.

With continued reference to fig. 2, in the illustrated embodiment, the perforated pipe 40 is disposed below the second mounting hole 21 and in the air outlet cavity, and the outlet end of the cyclone pipe 30 extends into the perforated pipe 40, which is beneficial to ensure that the urea and the tail gas in the cyclone pipe 30 enter the perforated pipe 40.

Because the plurality of through holes 41 are formed in the wall of the perforated pipe 40, after the urea and the tail gas enter the perforated pipe 40, part of the gas and liquid (the urea sprayed into the cylinder 10 is a mist urea solution, so the gas and liquid, i.e., the tail gas and the urea) can move towards the crushing plate 50 and the blocking cover 60 along the perforated pipe 40, and another part of the gas and liquid can overflow through the through holes 41. It is easy to understand, because tail gas forms rotatory air current in cyclone tube 30, the urea granule that rotatory air current was wrapped in can be the centrifugal motion, consequently, the whirl gets into porous pipe 40 after, receives centrifugal force's influence, and the urea granule can dash the pipe wall to porous pipe 40 gradually, and then strikes porous pipe 40's wall or spills over from through-hole 41, and at this moment, through-hole 41 helps broken urea granule, and then is favorable to urea to hydrolyze, the ammonia mixes with the tail gas, and can reduce the risk of urea crystallization in porous pipe 40. In addition, urea and tail gas overflowing through the through hole 41 can further circulate and mix in the gas outlet cavity, and the gas outlet cavity can increase the diffusion space, so that the urea and the tail gas can uniformly circulate, and the catalytic reduction of the downstream SCR carrier on the tail gas is further facilitated.

With continued reference to FIG. 2, in the illustrated embodiment, the breaker plate 50 is disposed within the perforated tube 40, and the exhaust gas and urea flowing along the perforated tube 40 contact the breaker plate 50. Referring to fig. 6, since the diameter of the flow holes 51 is larger than that of the crushing holes 52, the flow holes 51 with large diameter are preferably selected to flow when the exhaust gas and urea flow through the crushing plate 50; therefore, most of the gas and liquid will pass through the breaker plate 50 through the flow holes 51; at the same time, another portion of the gas-liquid will pass through the breaker plate 50 through the breaker holes 52. Because the crushing holes 52 are arranged around the crushing plate 50, when the tail gas and the urea flow through the crushing plate 50, the gas-liquid flow on the crushing plate 50 is uniform, the back pressure is stable, and the urea is not easy to crystallize.

With continued reference to fig. 2, in the illustrated embodiment, the cap 60 is disposed downstream of the breaker plate 50 and spaced from the breaker plate 50. Therefore, after the exhaust gas and urea pass through the breaker plate 50, the gas-liquid flows out from the gap between the cap 60 and the breaker plate 50 (i.e., overflows from the outer side of the cap 61). Because the interval between blanking cover 60 and the breaker plate 50 is greater than circulation hole 51 and broken hole 52 on the breaker plate 50, tail gas and urea flow through the in-process of breaker plate 50 and blanking cover 60, its flow area is by little grow, and under this effect, tail gas and vaporific urea can mix better, and simultaneously, the gas-liquid flows at a high speed between blanking cover 60 and breaker plate 50, can reduce accumulational probability, the reduction urea crystallization risk of urea on blanking cover 60.

To facilitate the positioning of the cap 60, the cap 60 can be positioned in the perforated tube 40 or outside the perforated tube 40.

Since the cover portion 61 of the blocking cover 60 faces the flow hole 51, in order to prevent urea from accumulating on the cover portion 61,

alternatively, the cover portion 61 is provided with a plurality of sub-orifice holes 61 a.

In one embodiment, referring to fig. 3 and 6, the cover portion 61 is provided with a plurality of turns of the auxiliary orifice 61a, and the plurality of turns of the auxiliary orifice 61a are concentrically arranged. Any one turn includes a plurality of auxiliary flow holes 61a, and the plurality of auxiliary flow holes 61a in any one turn are arranged at equal intervals in the circumferential direction. Meanwhile, the density of the auxiliary flow holes 61a in the plurality of circles is different, and the closer to the center of the circle, the smaller the interval between two adjacent auxiliary flow holes 61a in one circle is. Further, a sub orifice 61a is provided at the center position. In this way, the auxiliary orifices 61a in the cover portion 61 are offset and densely distributed, and more auxiliary orifices 61a can be provided by more sufficiently utilizing the space of the cover portion 61, so that the effects of dispersing the exhaust gas and urea, avoiding urea crystallization, and reducing the back pressure of the cap 60 can be achieved.

When the cover part 61 is provided with the auxiliary flow hole 61a, the tail gas and the urea which pass through the crushing plate 50 are influenced by the size of the channel, most of the gas and liquid can overflow from the space between the blocking cover 60 and the crushing plate 50, and the other part of the gas and liquid can overflow through the auxiliary flow hole 61a, and the flow velocity of the gas and liquid overflowing through the auxiliary flow hole 61a can be increased due to the small aperture of the auxiliary flow hole 61a, so that the urea is further crushed, and the ammonia mixing is enhanced.

In conclusion, through setting up through breaker plate 50 and blanking cover 60, can improve the atomizing level of urea, reduce the risk of urea crystallization by a wide margin.

Optionally, the plug 60 further includes a branch portion 62, and the branch portion 62 is disposed on a side of the cover portion 61; the blanking cap 60 is disposed in the perforated tube 40 and the leg 62 is adapted to contact the inner wall of the perforated tube 40.

Referring to fig. 2 and 6 in combination, in the illustrated embodiment, three branches 62 are disposed on the periphery of the cover 61, the three branches 62 are disposed at equal intervals, and each branch 62 includes a transverse extension and a longitudinal extension. When the blanking cap 60 is in the perforated tube 40, the outer diameter of the cap portion 61 is smaller than the inner diameter of the perforated tube 40, the lateral extension extends towards the inner wall of the perforated tube 40, and the longitudinal extension can be fitted against the inner wall of the perforated tube 40; such that the longitudinal extension is secured to the perforated tube 40 to facilitate securing the blanking cap 60 within the perforated tube 40. Further, since the number of the branch portions 62 is small and the interval is large, the branch portions 62 do not affect the flow of the exhaust gas, and the exhaust gas and urea passing through the breaker plate 50 can flow out from the interval between the cover portion 61 and the inner wall of the perforated pipe 40.

Optionally, the leg 62 is welded to the perforated tube 40.

Alternatively, the circulation hole 51 is a circular hole, the lid portion 61 is a disk shape, and the outer diameter of the lid portion 61 is not larger than the diameter of the circulation hole 51.

Specifically, referring to fig. 2 and 6, in the illustrated embodiment, the perforated pipe 40 is a circular pipe, the crushing plate 50 is also a disk, the center of the crushing plate 50 is provided with a flow hole 51, and a plurality of crushing holes 52 are arranged at equal intervals along the circumferential direction (the center of the circumference is the center of the crushing plate 50) and surround the flow hole 51. The crushing plate 50 structure that the symmetry set up is more stable, and tail gas and urea distribute more evenly when flowing through crushing plate 50, and mixing and crushing effect are better. Further, the cover 61 is disposed coaxially with the flow hole 51, so that the flow of the exhaust gas and the urea is more stable and balanced.

The outer diameter of the cover part 61 is not larger than the diameter of the circulation hole 51, so that the circulation space of the tail gas and the urea after passing through the crushing plate 50 can be enlarged, the gas-liquid flow direction can be dispersed, the crystallization position can be dispersed, and the crystallization risk can be reduced.

In some cases, the outer diameter of the cover 61 may be slightly larger than the diameter of the flow hole 51.

Optionally, the breaker plate 50 is welded to the perforated tube 40.

Optionally, at least two rows of through holes 41 are formed in the perforated pipe 40, each row includes a plurality of through holes 41, and the plurality of through holes 41 in any row are arranged at intervals along the circumferential direction; the crushing plate 50 and the blocking cover 60 are arranged in the perforated pipe 40 at intervals, and at least one row of through holes 41 are arranged between the crushing plate 50 and the blocking cover 60 at intervals.

Referring specifically to fig. 2, in the illustrated embodiment, three rows of through holes 41 are formed in the perforated tube 40 along the length of the perforated tube 40, and each row includes a plurality of circumferentially arranged through holes 41. A row of through holes 41 are arranged between the crushing plate 50 and the blocking cover 60 at intervals, so that on one hand, the through holes 41 can be avoided, the crushing plate 50 and the blocking cover 60 can be conveniently and fixedly connected with the inner wall of the perforated pipe 40, and the arrangement of the crushing plate 50 and the blocking cover 60 at intervals is ensured; on the other hand, because the through hole 41 is provided between the crushing plate 50 and the blocking cover 60, the exhaust gas and urea passing through the crushing plate 50 can flow out from the through hole 41, the cover 61 and the perforated pipe 40, and the auxiliary flow hole 61a, which is more beneficial to the atomization of urea and the mixing of ammonia gas and exhaust gas.

Optionally, the through hole 41 is a kidney-shaped hole.

It should be explained that the porosity of the perforated tube 40 affects the urea retention, and urea tends to crystallize within the perforated tube 40 if a substantial portion of the urea collects in the perforated tube 40 and flows downstream along the perforated tube 40. Make through-hole 41 be waist type hole, the flow area of through-hole 41 is bigger, and the gas-liquid flow through-hole 41 outflow is bigger, even urea is at porous pipe 40 internal crystallization, the crystallization also can conveniently be taken away to the gas-liquid of outflow to the process of guaranteeing tail gas and urea mixture lasts, stable and high-efficient.

Optionally, the perforated tube 40 has a tube diameter greater than the tube diameter of swirl tube 30.

Referring to fig. 2 specifically, in the illustrated embodiment, the diameter of the swirl tube 30 is small, and after the tail gas enters the swirl tube 30, the flow velocity is large, which is beneficial to forming a high-speed swirl; the swirling flow can entrain urea to flow downstream. Easily understand, the vaporific urea solution that the urea nozzle sprayed into cyclone tube 30 is the taper, consequently, the urea that gets into cyclone tube 30 can be towards cyclone tube 30's pipe wall diffusion, through the inlet port 31 that circumference was arranged, make tail gas form the whirl, can make things convenient for tail gas contact urea, can also prevent urea contact cyclone tube 30, and then the crystallization on cyclone tube 30.

Meanwhile, because the pipe diameter of the perforated pipe 40 is large, after the tail gas wraps the urea and enters the perforated pipe 40, the urea cannot immediately contact the pipe wall of the perforated pipe 40 due to the increase of the diffusion space, and therefore the wall contact time of the urea can be prolonged, and the urea can be conveniently pyrolyzed in the perforated pipe 40.

In order to fully utilize the space of the gas outlet cavity and prolong the motion path of the tail gas and the urea, the cyclone tube 30 is optionally obliquely arranged in the cylinder 10. For example, in the embodiment shown in fig. 2, the swirl tube 30 is inclined from top to bottom to the right and is inserted into the first mounting hole 11 and the second mounting hole 21; after entering the cyclone tube 30, the urea is entrained by the rotating airflow and moves obliquely from top to bottom.

Through setting up the slope of cyclone tube 30, it encircles cyclone tube 30 still to be favorable to the tail gas in the chamber of admitting air, and then guarantees that tail gas gets into cyclone tube 30 through a plurality of inlet ports 31 to form the high-speed rotatory air current that assembles in cyclone tube 30.

Likewise, optionally, the perforated tube 40 is disposed obliquely within the barrel 10. For example, in the embodiment shown in fig. 2, the perforated pipe 40 is inclined from top to bottom to the right, and the axis of the perforated pipe 40 is collinear with the axis of the swirling pipe 30, so that the smooth passage formed by the perforated pipe 40 and the swirling pipe 30 is facilitated, and the urea can be prevented from directly impacting the pipe wall of the perforated pipe 40 and crystallizing on the perforated pipe 40 when the tail gas and urea enter the perforated pipe 40 along the swirling pipe 30. In addition, through setting up the direction slope of perforated pipe 40 towards keeping away from backup pad 20, the backup pad 20 is kept away from to through-hole 41, can increase the outside diffusion space of tail gas and urea, makes things convenient for some tail gas and urea to pass through-hole 41 and gets into out the air cavity, plays broken urea, even air current, improves the effect that the ammonia mixes.

For conveniently connecting swirl tube 30 and barrel 10, in an embodiment, the broken urea mixing arrangement in layering that this application provided still includes: the nozzle base 1 is used for connecting a urea nozzle; and the clam shell 2 is supported and arranged on the first mounting hole 11 and used for connecting the nozzle base 1 and the cyclone tube 30. Wherein, the urea nozzle is used for outputting urea.

Specifically, referring to fig. 1 and 2 in combination, the supporting clam shell 2 is disposed outside the cylinder 10 and can shield the first mounting hole 11, so as to prevent dust and protect the cylinder 10 and its internal structure. An opening is formed in the supporting clam shell 2, the nozzle base 1 is arranged on the supporting clam shell 2, a urea channel is arranged in the nozzle base 1, and the urea channel is communicated with the opening. In practice in the exhaust system of a vehicle, the nozzle base 1 is used in conjunction with a urea nozzle which is capable of spraying urea solution which is capable of passing through a urea passage and an opening supporting the clam shell 2. The upper end of the cyclone tube 30 is hermetically connected with the inner wall of the supporting clam shell 2, and the inlet end of the cyclone tube 30 is communicated with the opening of the supporting clam shell 2; the urea solution can enter the cyclone tube 30 after passing through the opening of the supporting clam shell 2, and then contacts the tail gas.

Optionally, the upper end of the cyclone tube 30 is welded and fixed with the inner wall of the supporting clam shell 2.

In the embodiment shown in fig. 2, cyclone tube 30 slope sets up, for avoid supporting clamshell 2 to hinder tail gas to encircle cyclone tube 30 and flow, get into cyclone tube 30 from a plurality of inlet ports 31, the aperture of first mounting hole 11, and the inner space that supports clamshell 2 is greater than cyclone tube 30's external dimension, and from the left hand right side, support clamshell 2 along the size increase of upper and lower direction, make the inner wall that supports clamshell 2 and cyclone tube 30 between have the interval, so that the tail gas circulates.

Optionally, a fin 32 is disposed on one side of any one of the air inlet holes 31, the fin 32 is protruded out of the cyclone tube 30, and the fin 32 is inclined towards the corresponding air inlet hole 31; a plurality of fins 32 are arranged in an array about the axial center of swirl tube 30.

Specifically, referring to fig. 2 and 5 in combination, since the fins 32 are protruded out of the cyclone tube 30, an inclined air inlet channel is formed between each fin 32 and the corresponding air inlet 31; when the exhaust gas flows to the air inlet holes 31, the exhaust gas is interfered by the fins 32, and part of the exhaust gas enters the corresponding air inlet holes 31 along the fins 32; because inlet channel slope, tail gas follow inlet channel rush into cyclone tube 30 after, can receive the blockking of the circular pipeline of cyclone tube 30 inner wall, tail gas is along the diversion of cyclone tube 30 inner wall, and then forms effectual whirl.

Because a plurality of fins 32 are arranged around the axle center array of cyclone tube 30, the extending direction of a plurality of fins 32 is the different tangential direction of same interior circle (the centre of a circle of this interior circle and the centre of a circle of cyclone tube 30 circular cross-section are concurrent), consequently, all along tangential motion through the tail gas that each inlet port 31 got into cyclone tube 30, multichannel tail gas assembles in cyclone tube 30, can strengthen the whirl effect, is favorable to the mixture and the flow of tail gas and urea.

Optionally, the supporting plate 20 is further provided with a blowing hole 22; after the tail gas enters the air inlet cavity, part of the tail gas enters the cyclone tube 30 through the air inlet hole 31, and the other part of the tail gas enters the air outlet cavity through the air blowing hole 22.

In the embodiment shown in fig. 2, the blow holes 22 are directly below the perforated pipe 40. Therefore, the exhaust gas blown into the gas outlet chamber through the blowing holes 22 can blow the urea flowing out through the perforated pipe 40, the crushing plate 50 and the blocking cover 60, thereby preventing the urea from being crystallized on the perforated pipe 40, the crushing plate 50, the blocking cover 60 or the support plate 20. Since the blow hole 22 is also close to the bottom of the drum 10, the exhaust gas blown through the blow hole 22 can also prevent urea from dropping onto the drum 10. In addition, because the blowing holes 22 are opposite to the air outlet end of the cylinder 10, the tail gas blown in through the blowing holes 22 can also promote the urea to flow towards the air outlet end, which is beneficial to the mixing and circulation of the urea and the tail gas.

In order to limit the moving path of the exhaust gas after entering the cylinder 10, the supporting plate 20 is connected with the inner wall of the cylinder 10 in a sealing way. Optionally, the support plate 20 is welded within the barrel 10.

In one embodiment, the support plate 20 includes: the first connecting plate 23, the air blowing hole 22 is arranged on the first connecting plate 23; the mounting plate 24, the second mounting hole 21 locates on mounting plate 24; a second connecting plate 25, and the mounting plate 24 connects the first connecting plate 23 and the second connecting plate 25; the first connecting plate 23 and the second connecting plate 25 are not connected to the mounting plate 24 and have a circular arc shape.

Referring specifically to fig. 1, 2 and 4 in combination, in the illustrated embodiment, the first connecting plate 23, the mounting plate 24 and the second connecting plate 25 are connected in a stepped manner, the mounting plate 24 is disposed at an angle to the first connecting plate 23, and the second connecting plate 25 is parallel to the first connecting plate 23. Therefore, when the supporting plate 20 is fixed in the cylinder 10, a gap is formed between the mounting plate 24 and the first mounting hole 11, and at least the portion of the cyclone tube 30, which is provided with the air inlet 31, is located in the gap, so that the tail gas flows around the cyclone tube 30.

Because be the pipe passageway in the barrel 10 for one side that first connecting plate 23 and second connecting plate 25 do not link to each other with mounting panel 24 is circular-arcly, and the leakproofness that backup pad 20 and barrel 10 are connected is guaranteed to the inner wall that first connecting plate 23 and second connecting plate 25's circular arc limit can laminate barrel 10.

Optionally, a skirt is arranged on the periphery of the support plate 20, and when the support plate 20 is arranged in the cylinder 10, the skirt is attached to the inner wall of the cylinder 10. Through setting up the shirt rim, can increase the area of contact of backup pad 20 and barrel 10 inner wall, be favorable to the sealing connection of backup pad 20 and barrel 10, can also increase the structural rigidity of backup pad 20.

Optionally, the first connecting plate 23 and/or the second connecting plate 25 are provided with an extension wall 26; when the support plate 20 is disposed within the cartridge body 10, the extension wall 26 abuts the inner wall of the cartridge body 10.

Referring specifically to fig. 2 and 4 in combination, in the illustrated embodiment, the support plate 20 is provided with a skirt at its periphery that extends from the inlet chamber to the outlet chamber. Meanwhile, the extension wall 26 is arranged on the skirt edge below the arc side edge of the first connecting plate 23, which is far away from the mounting plate 24, the extension wall 26 further extends the skirt edge, so that the extension wall can be better attached to the inner wall of the cylinder 10, the structural rigidity of the support plate 20 is enhanced, and the sealing performance of the support plate 20 connected with the cylinder 10 is improved. In addition, an extension wall 26 is also arranged above the arc side edge of the second connecting plate 25 away from the mounting plate 24, and the extension wall 26 further extends the skirt edge and is used for attaching and connecting the inner wall of the cylinder 10.

By arranging the extension wall 26, the contact area of the support plate 20 and the cylinder 10 is larger, and the connection is more stable; when the exhaust gas impacts the support plate 20, the support plate 20 is not easily displaced and deformed.

Further, when the extension walls 26 are provided on both the first connection plate 23 and the second connection plate 25, the extension walls 26 on both sides can be engaged with each other, thereby enhancing the stability of the installation of the support plate 20.

Optionally, the hole periphery of the second mounting hole 21 is provided with a bent wall 21 a; at least part of the cyclone tube 30 extends into the second mounting hole 21 and contacts the bent wall 21 a; and/or, the folded wall 21a extends into the perforated tube 40.

Referring to fig. 2 and 4 in combination, in the illustrated embodiment, the bent wall 21a extends into the hole of the second mounting hole 21, is away from the first mounting hole 11, and has a certain length. The lower extreme of cyclone tube 30 stretches into in the second mounting hole 21, and the outer wall of bending wall 21a contact cyclone tube 30 can increase the area of contact of second mounting hole 21 and cyclone tube 30, is favorable to cyclone tube 30 fixed the setting on second mounting hole 21.

Optionally, swirl tube 30 is welded to the bent wall 21 a.

With continued reference to FIG. 2, in the illustrated embodiment, the upper end of the perforated tube 40 is connected to the inner wall of the support plate 20 facing away from the intake chamber, and the perforated tube 40 surrounds the folded wall 21a such that the folded wall 21a extends into the perforated tube 40. Because the bent wall 21a is hermetically connected to the cyclone tube 30, the exhaust gas and urea flowing out through the cyclone tube 30 can stably and efficiently enter the perforated tube 40.

Optionally, the upper end of the perforated tube 40 is welded to the inner wall of the support plate 20 facing away from the inlet chamber.

Optionally, the layered crushing urea mixing device provided by the application further comprises a cyclone plate 70, which is arranged in the gas outlet cavity; the cyclone plate 70 is provided with a plurality of cyclone openings 71, and the plurality of cyclone openings 71 are arranged at intervals along the circumferential direction; the swirl plate 70 is further provided with intermediate openings 72, the intermediate openings 72 being provided between the plurality of swirl openings 71.

Referring first to fig. 2 and 3, in the illustrated embodiment, the swirl plate 70 and the support plate 20 are disposed in the cylinder at an interval, the swirl plate 70 is disposed at the right side of the support plate 20, and the perforated pipe 40 is disposed between the swirl plate 70 and the support plate 20; form the mixing chamber between whirl plate 70 and the backup pad 20, through porous pipe 40, breaker plate 50 and blanking cover 60 entering gas outlet cavity's tail gas and urea can flow, reach better mixture and evenly distributed's effect in the mixing chamber.

After passing through the swirl plate 70, the exhaust gas and urea can flow out of the cartridge 10 and downstream. Generally, the downstream of the cylinder 10 is communicated with an SCR carrier, the SCR carrier has a catalytic effect, and after entering the SCR carrier, the ammonia gas generated by hydrolysis of the tail gas and urea is catalyzed by the SCR carrier, so that an oxidation-reduction reaction can be rapidly performed, and a tail gas purification effect is further achieved.

With reference to fig. 4, in the illustrated embodiment, the cyclone plate 70 is provided with eight cyclone openings 71, and the eight cyclone openings 71 are arranged in an array along the circumferential direction, so that the plate surface space of the cyclone plate 70 can be fully utilized, and the effect of reducing the back pressure of the cyclone plate 70 is achieved. When tail gas and urea solution in the mixing chamber flow through whirl board 70, can flow out from each whirl trompil 71 respectively, because a plurality of whirl trompils 71 are arranged along the circumferencial direction, the tail gas and the urea solution that flow out whirl trompil 71 can form the whirl, are favorable to the gas-liquid to get into in the SCR carrier of low reaches evenly.

For better circulation of the exhaust gas and the urea solution, the swirl plate 70 is further provided with an intermediate opening 72, and in the embodiment shown in fig. 4, the intermediate opening 72 is provided at the center of the circle where the plurality of swirl openings 71 are located, so that the exhaust gas and the urea flowing through the swirl plate 70 can uniformly pass through the swirl openings 71 and the intermediate opening 72. In this case, the intermediate holes 72 can further adjust the back pressure of the swirl plate 70, and can also assist the swirl holes 71 to improve ammonia mixing.

Optionally, the swirl apertures 71 are semi-circular, the swirl apertures 71 comprising straight edges and circular arc edges; a cover plate 73 is arranged on one side, away from the support plate 20, of the rotational flow open pore 71, the cover plate 73 shields the rotational flow open pore 71 and is spaced from the straight edge of the rotational flow open pore 71, and exhaust gas and urea can flow out through the space.

Specifically, with reference to fig. 3 and 4, a cover plate 73 is disposed on the right side of any semicircular rotational flow opening 71, and the cover plate 73 is substantially in the shape of an inverted bowl and can cover the right side of the rotational flow opening 71; meanwhile, the cover plate 73 is connected to the circular arc edge of the cyclone opening 71 and spaced apart from the straight line edge of the cyclone opening 71, so that the exhaust gas and urea can flow through the cyclone plate 70 at a spacing. Receive the injecion and the guide of cover plate 73, when tail gas and urea solution pass through whirl trompil 71, its flow direction slope and wriggle are favorable to strengthening the whirl effect, still are favorable to improving the velocity of flow, and then guarantee that the ammonia mixes the effect.

Optionally, the middle opening 72 is truncated cone-shaped, and the aperture of the middle opening 72 on the side close to the support plate 20 is larger than the aperture of the middle opening 72 on the side away from the support plate 20.

Trompil 72 is the round platform form in the middle of through setting up, and when tail gas and urea passed through middle trompil 72, middle trompil 72 can guide tail gas and urea to its export flow, and the output direction of further control tail gas and urea ensures that tail gas and urea flow direction through middle trompil 72 predetermine the position, guarantees the utilization ratio of SCR carrier.

Further, by setting the caliber of the middle opening 72 to be gradually reduced, the flow rate of the tail gas and the urea can be increased in the process of passing through the middle opening 72, and the ammonia mixing effect is facilitated.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A hierarchical broken urea mixing arrangement which characterized in that includes:

the cylinder body (10), wherein a first mounting hole (11) is formed in the cylinder body (10);

the support plate (20) is arranged in the barrel (10) and divides the interior of the barrel (10) into an air inlet cavity and an air outlet cavity, and a second mounting hole (21) is formed in the support plate (20);

the cyclone tube (30), the cyclone tube (30) is communicated with the first mounting hole (11) and the second mounting hole (21), a plurality of air inlets (31) are formed in the cyclone tube (30), the plurality of air inlets (31) are arranged at intervals along the circumferential direction, and the air inlets (31) are positioned in the air inlet cavity;

the porous pipe (40) is arranged in the air outlet cavity and communicated with the cyclone pipe (30), and a plurality of through holes (41) are formed in the porous pipe (40);

the crushing plate (50) is arranged in the porous pipe (40), a flow hole (51) and a plurality of crushing holes (52) are formed in the crushing plate (50), the crushing holes (52) are arranged around the flow hole (51), and the aperture of the flow hole (51) is larger than that of the crushing holes (52);

and the blocking cover (60) is arranged at the downstream of the crushing plate (50), the blocking cover (60) comprises a cover part (61), and the cover part (61) is opposite to the circulating hole (51).

2. The urea stratified crushed mixer as claimed in claim 1, wherein said cover portion (61) is provided with a plurality of auxiliary flow holes (61 a).

3. The urea stratified crushed mixer according to claim 1, wherein said closure (60) further comprises a leg (62), said leg (62) being provided laterally to said cover (61);

the plug (60) is arranged in the porous pipe (40), and the branch part (62) is used for contacting the inner wall of the porous pipe (40).

4. The urea layering and crushing mixing device according to claim 1, wherein the flow holes (51) are circular holes, the cover part (61) is disc-shaped, and the outer diameter of the cover part (61) is not larger than the diameter of the flow holes (51).

5. The urea layered crushing and mixing device according to claim 1, wherein at least two rows of said through holes (41) are opened on said perforated pipe (40), any row comprises a plurality of said through holes (41), and the plurality of said through holes (41) in any row are arranged at intervals along the circumferential direction;

the crushing plate (50) and the blocking cover (60) are arranged in the porous pipe (40) at intervals, and at least one row of through holes (41) are arranged between the crushing plate (50) and the blocking cover (60) at intervals.

6. The urea mixing device according to claim 1, characterized in that the through holes (41) are kidney-shaped holes.

7. The urea stratified crushed mixing apparatus as claimed in claim 1, wherein a pipe diameter of said perforated pipe (40) is larger than a pipe diameter of said cyclone pipe (30).

8. The urea mixing device according to any one of claims 1-7, characterized in that the support plate (20) is further provided with air blowing holes (22);

after the tail gas enters the air inlet cavity, part of the tail gas enters the cyclone tube (30) through the air inlet hole (31), and the other part of the tail gas enters the air outlet cavity through the air blowing hole (22).

9. The urea stratified crushing mixing device as claimed in claim 8, said support plate (20) comprising:

the first connecting plate (23), the air blowing hole (22) is arranged on the first connecting plate (23);

the mounting plate (24), the said second mounting hole (21) is set in the said mounting plate (24);

a second connecting plate (25), the mounting plate (24) connecting the first connecting plate (23) and the second connecting plate (25);

wherein, the side of the first connecting plate (23) and the second connecting plate (25) which is not connected with the mounting plate (24) is in a circular arc shape.

10. The urea layering and crushing mixing device according to any one of claims 1-7, further comprising a cyclone plate (70) disposed in the air outlet chamber;

the cyclone plate (70) is provided with a plurality of cyclone open pores (71), and the plurality of cyclone open pores (71) are arranged at intervals along the circumferential direction;

the cyclone plate (70) is further provided with a middle opening hole (72), and the middle opening hole (72) is formed among the cyclone opening holes (71).