CN220346187U - Nozzle and aftertreatment system - Google Patents

Abstract

The utility model provides a nozzle and a post-treatment system, the nozzle comprises a nozzle structure, the nozzle structure is provided with an inflow hole, and the nozzle structure further comprises: the opposite spraying body comprises a first conical structure, a plurality of first flow passages are arranged on the side surface of the first conical structure, and the first flow passages are sequentially arranged along the circumferential direction of the first conical structure; each first runner is provided with a first end and a second end which are sequentially arranged along the extending direction; the first cover body is provided with a first through hole, the first through hole comprises a first hole section and a second hole section which are sequentially communicated along the extending direction of the first through hole, and the first conical structure is arranged in the first hole section; the second end of each first flow channel is communicated with the second hole section, so that the fluid flowing in from the inflow hole flows through the first flow channel and then passes through the second hole Duan Penchu.

Description

Nozzle and aftertreatment system

Technical Field

The utility model relates to the technical field of nozzle equipment, in particular to a nozzle and a post-treatment system.

Background

With the rapid development of the automobile industry, the problem of tail gas pollution of diesel vehicles is more and more concerned. In the post-treatment technique, urea solution is typically used and sprayed into a post-treatment mixer where it is converted into ammonia and oxynitride by a series of physicochemical reactions such as collision, evaporative hydrolysis and pyrolysis. The urea injection system plays an important role in the spray atomization, evaporation pyrolysis and mixing processes of the urea aqueous solution, so that urea crystallization can be reduced, and cost and maintenance cost can be reduced; and the pyrolysis reaction is mainly carried out on the surface of urea atomized liquid drops, so that the size of the atomized particle size, the size of the atomized liquid drops, the uniformity of distribution and the like have important influence on the pyrolysis reaction effect.

At present, urea nozzles mostly adopt direct-injection six-hole nozzles, and the nozzle is only designed into a six-hole nozzle plate.

However, the above-mentioned urea nozzle atomization spray structure is difficult to achieve good atomization effect, the spray granularity is larger, urea solution is sprayed into the aftertreatment, a liquid film is easily formed on the nozzle head and the mixer wall, urea crystallization is caused, an exhaust pipeline is blocked, emission exceeds standard, and even an engine is possibly damaged under serious conditions; and the urea solution sprayed and atomized can not be fully pyrolyzed, the urea solution can not be fully mixed with the tail gas, so that the ammonia gas generated by the pyrolysis of the urea solution can not be mixed with NO in the tail gas _x The reaction is fully carried out, so that the lower the ammonia gas distribution uniformity coefficient and average mass fraction at the front end of the catalyst is, the NO is _x Is low in conversion efficiency.

Disclosure of Invention

The utility model mainly aims to provide a nozzle and a post-treatment system, which are used for solving the problems of poor atomizing effect and larger sprayed spray granularity of the nozzle in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a nozzle including a spout structure having an inflow hole, the spout structure further comprising: the opposite spraying body comprises a first conical structure, a plurality of first flow passages are arranged on the side surface of the first conical structure, and the first flow passages are sequentially arranged along the circumferential direction of the first conical structure; each first runner is provided with a first end and a second end which are sequentially arranged along the extending direction, the first end of each first runner extends to the bottom of the first conical structure and is communicated with the inflow hole, and the second end of each first runner extends to the top of the first conical structure; the first cover body is provided with a first through hole, the first through hole comprises a first hole section and a second hole section which are sequentially communicated along the extending direction of the first through hole, and the first conical structure is arranged in the first hole section; the second end of each first flow passage communicates with the second orifice segment such that fluid flowing from the inflow orifice flows through the first flow passage and then through the second orifice Duan Penchu.

Further, the plurality of first flow channels are uniformly arranged around a centerline of the first cone-shaped structure; and/or the first conical structure is a cone or a truncated cone structure, and each first runner extends along the extending direction of the bus of the first conical structure; and/or the first through hole is a conical hole, and the side surface of the first conical structure is attached to the inner wall of the first hole section; wherein, the first contained angle of the first through hole is more than or equal to 70 degrees and less than or equal to 120 degrees.

Further, the opposite spraying body further comprises: the bottom of the second conical structure is connected with the bottom of the first conical structure, a plurality of second flow passages are arranged on the side surface of the second conical structure, and the second flow passages are sequentially arranged along the circumferential direction of the second conical structure; each second flow channel is provided with a first end and a second end which are sequentially arranged along the extending direction, the first end of each second flow channel extends to the top of the second conical structure and is communicated with the inflow hole, and the second end of each second flow channel extends to the bottom of the second conical structure; the second flow channels are arranged in one-to-one correspondence with the first flow channels, and the second ends of the second flow channels are communicated with the first ends of the corresponding first flow channels, so that the fluid flowing in from the inflow holes sequentially flows through the second flow channels and the first flow channels and then passes through the second holes Duan Penchu.

Further, the plurality of second flow channels are uniformly arranged around a centerline of the second cone structure; and/or the second conical structure is a cone or truncated cone structure, and each second runner extends along the extending direction of the generatrix of the second conical structure.

Further, the opposite spraying body further comprises: the first end of the cylinder structure is connected with the bottom of the second conical structure, and the second end of the cylinder structure is connected with the bottom of the first conical structure; the side of the column structure is provided with a plurality of third flow passages, the second flow passages and the first flow passages are arranged in pairs, and the first ends and the second ends of the third flow passages are respectively communicated with the second flow passages arranged in pairs and the first flow passages arranged in pairs.

Further, the second flow passage, the third flow passage and the first flow passage, which are arranged in pairs, form a fluid passage; the first flow channel, the second flow channel and the third flow channel are projected on the corresponding projection surfaces to extend along the same direction; wherein, each projection surface is arranged perpendicular to the depth direction of the corresponding fluid channel; and/or, along the extending direction of the fluid channel, the widths of the fluid channel perpendicular to the extending direction thereof are equal.

Further, the cylinder structure is a cylinder, the cross section of the first end of the cylinder structure is the same as the cross section shape and the size of the bottom of the second cone structure, the cross section of the second end of the cylinder structure is the same as the cross section shape and the size of the bottom of the first cone structure, and each third runner extends along the extending direction of the bus of the cylinder structure.

Further, the spout structure further includes: the second cover body is connected with the first cover body, and a cavity for accommodating the opposite spraying body is formed between the second cover body and the first cover body; the inflow hole is arranged on the second cover body; the second cover body is also provided with a second through hole and a third through hole, and the inflow hole, the second through hole, the third through hole and the first through hole are sequentially communicated; the column structure is arranged in the third through hole, and the side surface of the column structure is attached to the wall of the third through hole; at least part of the second conical structure is arranged in the second through hole, and the side face of at least part of the second conical structure is attached to the inner wall of the second through hole.

Further, the first cover body is further provided with a fourth through hole, the fourth through hole is provided with a first end and a second end which are sequentially arranged along the extending direction of the fourth through hole, and the first end of the fourth through hole is communicated with one end of the first hole section of the second hole Duan Yuanli; the first end of the fourth through hole is equal to the flow cross section of one end of the first hole section of the second hole Duan Yuanli, and the fourth through hole is a round hole; wherein the diameter of the fourth through hole is greater than or equal to 0.3mm and less than or equal to 0.5mm.

Further, the first cover body is further provided with a fifth through hole, the fifth through hole is provided with a first end and a second end which are sequentially arranged along the extending direction of the fifth through hole, and the first end of the fifth through hole is communicated with the second end of the fourth through hole; the first end of the fifth through hole is equal to the second end of the fourth through hole in the cross-sectional flow area; the flow cross section of the fifth through hole gradually increases from the first end to the second end of the fifth through hole.

According to another aspect of the utility model, there is provided an aftertreatment system comprising a nozzle and an SCR treatment unit, the nozzle being a nozzle as described above.

By applying the technical scheme of the utility model, the nozzle comprises a nozzle structure, the nozzle structure is provided with an inflow hole, and the nozzle structure further comprises: the opposite spraying body comprises a first conical structure and a first cover body, wherein a plurality of first flow channels are formed in the side face of the first conical structure, the first cover body is provided with a first through hole, and the first through hole comprises a first hole section and a second hole section which are sequentially communicated along the extending direction of the first through hole. The urea solution flows through the first flow channels in sequence after entering the inflow holes and flows through the second holes Duan Penchu, wherein the plurality of first flow channels are opposite spray flow channels, so that urea rotational flow solutions flowing out of the second ends of the plurality of first flow channels collide with each other when meeting, the breaking of urea liquid drops and the atomization of urea solution are further promoted, and the problems that in the prior art, the nozzle atomization effect is poor and the sprayed spray granularity is large are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic view of the spout structure of a nozzle according to the present utility model;

fig. 2 shows a schematic view of a counter-jet body (four fluid channels) of a nozzle according to the utility model;

fig. 3 shows a bottom view of a counter-jet body (four fluid channels) of a nozzle according to the present utility model;

fig. 4 shows a schematic view of a counter-jet body (three fluid channels) of a nozzle according to the utility model;

fig. 5 shows a top view of a counter-jet body (three fluid channels) of a nozzle according to the utility model;

fig. 6 shows a schematic view of a counter-jet body (six fluid channels) of a nozzle according to the utility model;

fig. 7 shows a top view of a counter-jet body (six fluid channels) of a nozzle according to the utility model;

fig. 8 shows a schematic view of a first cap (with fourth and fifth through holes) of a nozzle according to the present utility model;

fig. 9 shows a schematic view of a first cap (without fourth and fifth through holes) of a nozzle according to the present utility model;

FIG. 10 shows a schematic view of a valve body of a nozzle according to the present utility model;

fig. 11 shows a schematic view of an embodiment of a nozzle according to the utility model.

Wherein the above figures include the following reference numerals:

1. a urea pipe quick-change joint; 2. a valve body; 3. an electromagnetic unit; 10. a spout structure; 11. an inflow hole; 13. a first cover; 131. a first through hole; 1311. a first bore section; 1312. a second bore section; 132. a fourth through hole; 133. a fifth through hole; 14. a second cover; 141. a second through hole; 142. a third through hole; 20. a spray body; 21. a first cone-shaped structure; 22. a column structure; 23. a third flow passage; 24. a first flow passage; 25. a second cone structure; 26. a second flow passage; 201. static iron; 202. pre-tightening a bolt; 203. pre-tightening a spring sleeve; 204. a pre-tightening spring; 205. a spout protective sleeve; 206. a push rod; 207. sealing the sphere.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The present utility model provides a nozzle, please refer to fig. 1 to 11, comprising a nozzle structure 10, the nozzle structure 10 having an inflow hole 11, the nozzle structure 10 further comprising: the opposite spray body 20 comprises a first conical structure 21, wherein a plurality of first flow channels 24 are arranged on the side surface of the first conical structure 21, and the first flow channels 24 are sequentially arranged along the circumferential direction of the first conical structure 21; each first flow passage 24 has a first end and a second end arranged in sequence along the extending direction thereof, the first end of each first flow passage 24 extends to the bottom of the first tapered structure 21 and communicates with the inflow hole 11, and the second end of each first flow passage 24 extends to the top of the first tapered structure 21; a first cover 13 having a first through hole 131, the first through hole 131 including a first hole section 1311 and a second hole section 1312 communicating in sequence along an extending direction thereof, the first taper structure 21 being provided in the first hole section 1311; the second end of each first flow passage 24 communicates with the second hole section 1312 so that the fluid flowing in from the inflow hole 11 flows through the first flow passage 24 and is ejected through the second hole section 1312.

The nozzle of the present utility model comprises a nozzle structure 10, the nozzle structure 10 is provided with an inflow hole 11, the nozzle structure 10 further comprises a counter-nozzle body 20 and a first cover body 13, the counter-nozzle body 20 comprises a first conical structure 21, a plurality of first flow passages 24 are arranged on the side surface of the first conical structure 21, the first cover body 13 is provided with a first through hole 131, and the first through hole 131 comprises a first hole section 1311 and a second hole section 1312 which are sequentially communicated along the extending direction of the first through hole 131. Urea solution enters the inflow hole 11, flows through the first flow passages 24 and the second hole sections 1312 in sequence, and is sprayed out; the first flow channels 24 are opposite-spraying flow channels, and the fluid flowing out from the second ends of the first flow channels 24 are converged to form fluid opposite-spraying, and urea solution after opposite spraying is mutually impacted in the second hole section 1312 and finally sprayed out. As can be seen, the urea solution counter-spray collision from the second ends of the plurality of first flow channels 24 promotes the breaking of urea droplets and the atomization of urea solution; the second bore section 1312 provides sufficient impingement space for the urea solution exiting the plurality of first flow passages 24 to spray finer, more uniform atomized droplets, thereby solving the problem of poor nozzle atomization in the prior art and larger spray particle size.

It should be noted that, the first tapered structure 21 has a first end and a second end that are sequentially disposed along an axial direction thereof, and the first tapered structure 21 is a tapered structure, so long as a cross section of the first tapered structure 21 gradually decreases from the first end to the second end, and a side surface thereof has an inclined surface that is disposed obliquely with respect to the axial direction, so that the plurality of first flow passages 24 are disposed on the inclined surface and form a converging and opposing spray at the second end of the first tapered structure 21.

Specifically, when urea solutions in the plurality of first flow passages 24 meet, collisions are generated between each other, as the collision angle increases, the velocity component of the liquid jet in the horizontal direction increases, the velocity component in the vertical direction decreases, the actual collision momentum of the two jets increases, so that the instability of the liquid film produced by the collisions in the lateral direction increases, the turbulent motion of the liquid is more intense, the fluctuation amplitude of the collision wave intuitively appears to increase, the critical breaking point is reached in a relatively short distance, and the increase of the collision angle also causes the liquid film to break up more, thereby promoting the breaking of urea liquid droplets and the atomization of urea solution.

In the present embodiment, the plurality of first flow passages 24 are uniformly arranged around the center line of the first taper structure 21; and/or, the first conical structure 21 is in a cone or truncated cone structure, and each first runner 24 extends along the extending direction of the generatrix of the first conical structure 21; and/or, the first through hole 131 is a conical hole, and the side surface of the first conical structure 21 is attached to the inner wall of the first hole section 1311; wherein the first included angle of the first through hole 131 is greater than or equal to 70 ° and less than or equal to 120 °.

Specifically, the plurality of first flow passages 24 are uniformly arranged around the center line of the first conical structure 21, so that urea solution can uniformly flow out of the plurality of first flow passages 24, and sufficient collision among the urea solution can be ensured, and sufficient atomization of the urea solution can be ensured.

Specifically, the first tapered structure 21 has a conical or truncated cone structure, and each first flow channel 24 extends along an extending direction of a bus bar of the first tapered structure 21, so as to facilitate smooth flow of the urea solution in the first flow channel 24.

Specifically, the first through hole 131 is a tapered hole, and the side surface of the first tapered structure 21 is attached to the inner wall of the first hole section 1311, so that it can be avoided that part of urea solution cannot flow through the first flow channel 24 to the second hole section, so that droplets of the part of urea solution cannot be sufficiently broken, and the atomization effect of the urea solution is affected; the third included angle θ of the first through hole 131 is greater than or equal to 70 ° and less than or equal to 120 °, as shown in fig. 8, such arrangement can ensure the flow rate of the urea solution flowing into the first through hole 131 and the impact strength to the first through hole 131, thereby ensuring the breaking degree of urea droplets, and further reducing the granularity of urea spray. It should be noted that, the first through hole 131 herein has a conical shape as a whole, and the top thereof is not a sharp point but has an opening.

In this embodiment, the opposite spray body further includes: the bottom of the second conical structure 25 is connected with the bottom of the first conical structure 21, a plurality of second flow channels 26 are arranged on the side surface of the second conical structure 25, and the plurality of second flow channels 26 are sequentially arranged along the circumferential direction of the second conical structure 25; each second flow passage 26 has a first end and a second end which are sequentially arranged along the extending direction thereof, the first end of each second flow passage 26 extends to the top of the second conical structure 25 and is communicated with the inflow hole 11, and the second end of each second flow passage 26 extends to the bottom of the second conical structure 25; the plurality of second flow channels 26 are disposed in one-to-one correspondence with the plurality of first flow channels 24, and the second end of each second flow channel 26 is communicated with the first end of the corresponding first flow channel 24, so that the fluid flowing in from the inflow hole 11 flows through the second flow channel 26 and the first flow channel 24 in sequence and is ejected through the second hole section 1312.

Specifically, urea solution flows from the inflow holes 11 to the plurality of second flow passages 26, then flows to the corresponding first flow passages 24 in sequence, and is ejected through the second hole sections 1312. The second cone-shaped structure 25 plays a role in uniformly distributing the urea solution, so that the urea solution uniformly flows into the first flow passages 24, and collision among the urea solution flowing out of the first flow passages 24 and urea liquid drop breakage are prevented from being influenced due to overlarge flow rate flowing into the first flow passages 24.

It should be noted that, the second cone structure 25 has a first end and a second end sequentially disposed along an axial direction thereof, and the second cone structure 25 is a cone-shaped structure, so long as a cross section of the second cone structure 25 in a direction from the first end to the second end thereof gradually increases, and a side surface thereof has an inclined surface obliquely disposed with respect to the axial direction, so that the plurality of second flow passages 26 are disposed on the inclined surface and all communicate with the inflow hole 11 at the first end of the second cone structure 25 to split the fluid to the third flow passage 23. Wherein the centre line of the inflow bore 11 extends in the axial direction of the second cone structure 25.

In the present embodiment, the plurality of second flow passages 26 are uniformly arranged around the center line of the second tapered structure 25; and/or, the second conical structure 25 is in a cone or truncated cone structure, and each second flow channel 26 extends along the extending direction of the generatrix of the second conical structure 25.

In particular, the plurality of second flow channels 26 are evenly arranged around the center line of the second cone structure 25, helping the second cone structure 25 to achieve an even split of urea solution.

Specifically, the second cone structure 25 is a cone or a truncated cone structure, which facilitates the smooth flow of urea solution in the second flow channel 26.

In the present embodiment, the opposite spray body 20 further includes: the first end of the column structure 22 is connected with the bottom of the second conical structure 25, and the second end of the column structure 22 is connected with the bottom of the first conical structure 21; wherein, a plurality of third flow channels 23 are arranged on the side surface of the column structure 22, the third flow channels 23, the second flow channels 26 and the first flow channels 24 are arranged in pairs, and the first ends and the second ends of the third flow channels 23 are respectively communicated with the second flow channels 26 arranged in pairs and the first flow channels 24 arranged in pairs.

Specifically, the urea solution flows through the third flow channel 23 and the first flow channel 24 in sequence after entering the second flow channel 26 from the inflow hole 11, and is then sprayed out through the second end of the first flow channel 24, and the third flow channel 23 is arranged to ensure a smooth transition of the fluid between the second flow channel 26 and the first flow channel 24.

In the present embodiment, the second flow passage 26, the third flow passage 23, and the first flow passage 24, which are provided in pairs, form a fluid passage; wherein, a plurality of fluid channels are arranged in one-to-one correspondence with a plurality of projection surfaces, and projections of the first fluid channel 24, the second fluid channel 26 and the third fluid channel 23 on the corresponding projection surfaces extend along the same direction; wherein, each projection surface is arranged perpendicular to the depth direction of the corresponding fluid channel; and/or, along the extending direction of the fluid channel, the widths of the fluid channel perpendicular to the extending direction thereof are equal.

Specifically, the projections of the first flow channel 24, the second flow channel 26 and the third flow channel 23 on the respective projection surfaces extend in the same direction, which facilitates the smooth flow of the urea solution in the flow channels.

In particular, the equal width of the fluid channels perpendicular to their extension direction along the extension direction of the fluid channels contributes to achieving a smooth transition of urea solution between the second flow channel 26, the third flow channel 23 and the first flow channel 24.

Optionally, the flow cross section of the fluid channel is semi-circular, such an arrangement facilitating processing.

In this embodiment, the column structure 22 is a cylinder, the cross section of the first end of the column structure 22 is the same as the cross section and the size of the bottom of the second cone structure 25, the cross section of the second end of the column structure 22 is the same as the cross section and the size of the bottom of the first cone structure 21, and each third flow channel 23 extends along the extending direction of the bus bar of the column structure 22.

In particular, such an arrangement helps to achieve a smooth transition of urea solution between the column structure 22 and the second cone structure 25.

In this embodiment, the spout structure 10 further includes: the second cover 14 is connected with the first cover 13 and forms a cavity for accommodating the opposite spray body 20 between the second cover and the first cover; the inflow hole 11 is provided on the second cover 14; the second cover 14 further has a second through hole 141 and a third through hole 142, and the inflow hole 11, the second through hole 141, the third through hole 142 and the first through hole 131 are sequentially communicated; the column structure 22 is disposed in the third through hole 142, and a side surface of the column structure 22 is attached to a wall of the third through hole 142; at least part of the second conical structure 25 is disposed in the second through hole 141, and at least part of the side surface of the second conical structure 25 is attached to the inner wall of the second through hole 141.

Specifically, the urea solution flows from the inflow hole 11, flows through the second through hole 141 and the third through hole 142 in this order, flows into the first through hole 131, flows through the second hole section 1312, and is then ejected; the side surface of the column structure 22 is attached to the wall of the third through hole 142, so that part of urea solution can be prevented from overflowing from the third flow channel 23; at least part of the side of the second conical structure 25 is attached to the inner wall of the second through hole 141, so that the problem that part of urea solution cannot flow through the second flow channel 26, thereby affecting the rotational flow and collision of the urea solution and affecting the atomization effect of the urea solution can be avoided.

In other embodiments, as shown in fig. 8, the first cover 13 further has a fourth through hole 132, where the fourth through hole 132 has a first end and a second end sequentially arranged along the extending direction of the fourth through hole 132, and the first end of the fourth through hole 132 is communicated with an end of the second hole section 1312 away from the first hole section 1311; the first end of the fourth through hole 132 and the second hole section 1312 have equal flow cross-sectional areas at the end far from the first hole section 1311, and the fourth through hole 132 is a round hole; wherein the diameter of the fourth through hole 132 is greater than or equal to 0.3mm and less than or equal to 0.5mm.

Specifically, the urea solution flows through the first hole section 1311 and the second hole section 1312 in this order, and then flows out of the fourth hole 132. Wherein the equal flow cross-sectional areas of the first end of the fourth through hole 132 and the end of the second hole section 1312 away from the first hole section 1311 means that the flow cross-section of the first end of the fourth through hole 132 is the same as the shape and the size of the flow cross-section of the end of the second hole section 1312 away from the first hole section 1311; the fourth through hole 132 is a round hole, which is beneficial to the rapid ejection of urea solution from the fourth through hole 132; the diameter of the fourth through hole 132 determines the spraying speed of urea spray and the particle size of urea, and the diameter of the fourth through hole 132 is smaller than or equal to 0.5mm, so that the urea spray can be quickly sprayed out of the fourth through hole 132, and small-particle-size urea liquid drops can be obtained; the diameter of the fourth through hole 132 is greater than or equal to 0.3mm, ensuring the spraying flow rate of urea spray.

In other embodiments, as shown in fig. 8, the first cover 13 further has a fifth through hole 133, the fifth through hole 133 has a first end and a second end sequentially arranged along the extending direction thereof, and the first end of the fifth through hole 133 communicates with the second end of the fourth through hole 132; the first end of the fifth through hole 133 is equal to the second end of the fourth through hole 132 in the flow cross-sectional area; wherein, in the direction from the first end to the second end of the fifth through hole 133, the flow cross section of the fifth through hole 133 is gradually increased.

Specifically, urea spray is sprayed from the fourth through hole 132 and then sequentially passes through the first end and the second end of the fifth through hole 133 and then is sprayed; in the direction from the first end to the second end of the fifth through hole 133, the flow section of the fifth through hole 133 is gradually increased, the spraying range of urea spray is enlarged, the urea spray beam sprayed out of the fourth through hole 132 is prevented from being blocked by the fifth through hole 133, and smooth spraying of urea spray is further ensured.

Optionally, the fifth through hole 133 is a tapered hole, and the fourth included angle of the fifth through hole 133To be larger than the spreading angle of the mist beam ejected from the fourth through hole 132, it is generally necessary to be larger than 60 °, and typically, for convenience of processing, the fourth included angle of the fifth through hole 133 is 90 °, as shown in fig. 8. The fifth through hole 133 here has a conical overall shapeThe top of the shape is not a sharp point, but is provided with an opening.

Specifically, by adjusting the size of the fourth through hole 132 and the third included angle θ, nozzles with different particle diameters and flow rates can be designed, and the application range of the nozzles is widened; when the required flow rate increases and the rotational flow is strong, the first cover 13 needs to be designed to have only the first through hole 131, and the fourth through hole 132 and the fifth through hole 133 are not needed, as shown in fig. 9, at this time, the flow rate of the urea solution increases, the rotational flow increases, and the particle size increases accordingly.

Specifically, when the size of the cylinder structure 22 is not limited, the number of fluid passages is N, and the diameter of the corresponding fourth through hole 132 is larger. Optionally, the number of fluid channels is one of 3 to 6, which can ensure the spraying strength of the urea solution and avoid the excessive increase of the production cost due to the size of the column structure 22.

Specifically, as shown in fig. 10 and 11, the nozzle of the utility model further comprises a urea pipe quick-change connector 1, a valve body 2 and an electromagnetic unit 3, wherein the urea pipe quick-change connector 1 is connected with a urea pressure pipe in normal use, a urea injection signal wire is inserted into the connector of the electromagnetic unit 3, and when a urea injection signal is sent to the electromagnetic unit 3, the electromagnetic unit 3 is electrified, and the valve body 2 is pulled to move leftwards, so that the nozzle is opened; the electromagnetic unit 3 is powered down, and the valve body 2 moves rightward under the action of the spring force, so that the nozzle is closed. Wherein, valve body 2 includes quiet iron 201, pretension bolt 202, pretension spring housing 203, pretension spring 204, spout protective sheath 205, ejector pin 206, sealing sphere 207 and spout structure 10, pretension spring 204 makes the sealing sphere 207 of ejector pin 206 head closely extrude on the second lid 14 of spout structure 10 under pretension bolt 202, shutoff inflow hole 11 for the nozzle is sealed, when electromagnetic unit 3 is electrified, pulling valve body 2 moves left, makes ejector pin 206 drive sealing sphere 207 left movement, opens inflow hole 11, makes the nozzle open, sprays urea.

The nozzle of this application processes fluid channel with certain angle on the conical surface of first toper structure and second toper structure, and urea solution is through striking each other behind many vertical fluid channel, accomplishes the atomizing mixing process through striking. Therefore, the application aims at the problem that the particle size of the nozzle is large, and the opposite-spraying type fluid channel is designed, so that the liquid impact is increased through opposite spraying, the particle size is reduced, and the ammonia conversion rate is improved. Aiming at the crystallization problem of the spray outlet of the spray nozzle, the opposite spray type fluid channel is designed, the horizontal direction speed is increased through the opposite spray structure, and crystallization caused by long-term use at the outlet of the spray nozzle can be well impacted, so that the crystallization at the outlet of the spray nozzle is prevented.

The impact wave generated by the jet type fluid channel is the most important factor for causing the liquid film to break, and the impact included angle generated by the jet type fluid channel is an important structural parameter for influencing the impact wave. Urea solution flowing out through a plurality of opposite spray type fluid channels mutually collides to improve the size of the collision wave, thereby leading to liquid film to aggravate crushing, reducing the particle diameter, increasing the atomization degree of urea spraying.

The utility model also provides an aftertreatment system, which comprises a nozzle and an SCR treatment unit, wherein the nozzle is the nozzle in the embodiment.

The aftertreatment system of the utility model comprises a nozzle, which is the nozzle in the above described embodiments, and an SCR treatment unit. The nozzle solves the problems of poor atomizing effect and larger sprayed spray granularity in the prior art.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

the nozzle of the present utility model comprises a nozzle structure 10, the nozzle structure 10 is provided with an inflow hole 11, the nozzle structure 10 further comprises a counter-nozzle body 20 and a first cover body 13, the counter-nozzle body 20 comprises a first conical structure 21, a plurality of first flow passages 24 are arranged on the side surface of the first conical structure 21, the first cover body 13 is provided with a first through hole 131, and the first through hole 131 comprises a first hole section 1311 and a second hole section 1312 which are sequentially communicated along the extending direction of the first through hole 131. Urea solution enters the inflow hole 11, flows through the first flow passages 24 and the second hole sections 1312 in sequence, and is sprayed out; the first flow channels 24 are opposite-spraying flow channels, and the fluid flowing out from the second ends of the first flow channels 24 are converged to form fluid opposite-spraying, and urea solution after opposite spraying is mutually impacted in the second hole section 1312 and finally sprayed out. As can be seen, the urea solution counter-spray collision from the second ends of the plurality of first flow channels 24 promotes the breaking of urea droplets and the atomization of urea solution; the second bore section 1312 provides sufficient impingement space for the urea solution exiting the plurality of first flow passages 24 to spray finer, more uniform atomized droplets, thereby solving the problem of poor nozzle atomization in the prior art and larger spray particle size.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (11)

1. A nozzle comprising a spout construction (10), the spout construction (10) having an inflow orifice (11), characterized in that the spout construction (10) further comprises:

the opposite spraying body (20) comprises a first conical structure (21), wherein a plurality of first flow passages (24) are arranged on the side surface of the first conical structure (21), and the first flow passages (24) are sequentially arranged along the circumferential direction of the first conical structure (21); each first flow passage (24) is provided with a first end and a second end which are sequentially arranged along the extending direction, the first end of each first flow passage (24) extends to the bottom of the first conical structure (21) and is communicated with the inflow hole (11), and the second end of each first flow passage (24) extends to the top of the first conical structure (21);

a first cover body (13) having a first through hole (131), the first through hole (131) including a first hole section (1311) and a second hole section (1312) which are sequentially communicated along an extending direction thereof, the first tapered structure (21) being provided in the first hole section (1311); the second end of each first flow passage (24) is communicated with the second hole section (1312) so that the fluid flowing in from the inflow hole (11) flows through the first flow passage (24) and then is sprayed out through the second hole section (1312).

2. The nozzle of claim 1, wherein the nozzle is configured to,

a plurality of the first flow channels (24) are uniformly arranged around the central line of the first conical structure (21); and/or the number of the groups of groups,

the first conical structures (21) are conical or circular truncated cone structures, and each first flow channel (24) extends along the extending direction of a bus of each first conical structure (21); and/or the number of the groups of groups,

the first through hole (131) is a conical hole, and the side surface of the first conical structure (21) is attached to the inner wall of the first hole section (1311); wherein a first included angle of the first through hole (131) is greater than or equal to 70 degrees and less than or equal to 120 degrees.

3. The nozzle according to claim 1, wherein the counter-jet body (20) further comprises:

the bottom of the second conical structure (25) is connected with the bottom of the first conical structure (21), a plurality of second flow channels (26) are arranged on the side surface of the second conical structure (25), and the second flow channels (26) are sequentially arranged along the circumferential direction of the second conical structure (25); each second flow passage (26) has a first end and a second end which are sequentially arranged along the extending direction, the first end of each second flow passage (26) extends to the top of the second conical structure (25) and is communicated with the inflow hole (11), and the second end of each second flow passage (26) extends to the bottom of the second conical structure (25);

the second flow channels (26) are arranged in a one-to-one correspondence with the first flow channels (24), and the second ends of the second flow channels (26) are communicated with the first ends of the first flow channels (24) respectively, so that fluid flowing in from the inflow holes (11) sequentially flows through the second flow channels (26) and the first flow channels (24) and then is sprayed out through the second hole sections (1312).

4. A nozzle as claimed in claim 3, wherein,

a plurality of the second flow channels (26) are uniformly arranged around the center line of the second conical structure (25); and/or the number of the groups of groups,

the second conical structure (25) is in a cone or truncated cone structure, and each second flow passage (26) extends along the extending direction of the bus of the second conical structure (25).

5. A nozzle according to claim 3, wherein the counter-jet body (20) further comprises:

a cylinder structure (22), a first end of the cylinder structure (22) being connected to the bottom of the second cone structure (25), a second end of the cylinder structure (22) being connected to the bottom of the first cone structure (21);

the side of the column structure (22) is provided with a plurality of third flow channels (23), the second flow channels (26) and the first flow channels (24) are arranged in pairs, and first ends and second ends of the third flow channels (23) are respectively communicated with the second flow channels (26) arranged in pairs and the first flow channels (24) arranged in pairs.

6. A nozzle according to claim 5, characterized in that the second flow channel (26), the third flow channel (23) and the first flow channel (24) arranged in pairs form a fluid channel; wherein,

the plurality of fluid channels are arranged in one-to-one correspondence with the plurality of projection surfaces, and projections of the first flow channel (24), the second flow channel (26) and the third flow channel (23) on the corresponding projection surfaces extend along the same direction; wherein, each projection surface is perpendicular to the depth direction of the corresponding fluid channel; and/or the number of the groups of groups,

along the extending direction of the fluid channel, the widths of the fluid channels perpendicular to the extending direction are equal.

7. The nozzle according to claim 5, characterized in that the cylindrical structure (22) is a cylinder, the cross section of the first end of the cylindrical structure (22) is identical to the cross section and the size of the bottom of the second conical structure (25), the cross section of the second end of the cylindrical structure (22) is identical to the cross section and the size of the bottom of the first conical structure (21), and each third flow channel (23) extends along the extension direction of the generatrix of the cylindrical structure (22).

8. The nozzle according to claim 5, wherein the spout structure (10) further comprises:

the second cover body (14) is connected with the first cover body (13) and forms a cavity for accommodating the opposite spraying body (20) between the second cover body and the first cover body; the inflow hole (11) is arranged on the second cover body (14);

the second cover body (14) is further provided with a second through hole (141) and a third through hole (142), and the inflow hole (11), the second through hole (141), the third through hole (142) and the first through hole (131) are sequentially communicated;

the column structure (22) is arranged in the third through hole (142), and the side surface of the column structure (22) is attached to the wall of the third through hole (142); at least part of the second conical structure (25) is arranged in the second through hole (141), and at least part of the side surface of the second conical structure (25) is attached to the inner wall of the second through hole (141).

9. The nozzle according to any one of claims 1 to 8, characterized in that the first cover body (13) further has a fourth through hole (132), the fourth through hole (132) having a first end and a second end arranged in sequence along its extension direction, the first end of the fourth through hole (132) being in communication with an end of the second hole section (1312) remote from the first hole section (1311); the first end of the fourth through hole (132) is equal to the flow cross section of one end of the second hole section (1312) far away from the first hole section (1311), and the fourth through hole (132) is a round hole;

wherein the diameter of the fourth through hole (132) is greater than or equal to 0.3mm and less than or equal to 0.5mm.

10. The nozzle according to claim 9, characterized in that the first cover (13) further has a fifth through hole (133), the fifth through hole (133) having a first end and a second end arranged in sequence along its extension direction, the first end of the fifth through hole (133) being in communication with the second end of the fourth through hole (132); the first end of the fifth through hole (133) and the second end of the fourth through hole (132) have the same flow cross-sectional area;

wherein the flow cross section of the fifth through hole (133) gradually increases from the first end to the second end of the fifth through hole (133).

11. An aftertreatment system comprising a nozzle and an SCR treatment unit, wherein the nozzle is a nozzle as claimed in any one of claims 1 to 10.