CN217632624U

CN217632624U - Mixer structure for exhaust emission

Info

Publication number: CN217632624U
Application number: CN202220937966.8U
Authority: CN
Inventors: 陈勇; 沈天宇; 赵治国; 王帅
Original assignee: Zhejiang Yinlun Machinery Co Ltd
Current assignee: Zhejiang Yinlun Machinery Co Ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-10-21
Anticipated expiration: 2032-04-20

Abstract

The utility model discloses a mixer structure for tail gas emission, which comprises a mixing cavity shell, a mixing cavity component and a urea nozzle mounting seat, wherein the mixing cavity component and the urea nozzle mounting seat are arranged on the mixing cavity shell; the mixing cavity assembly comprises a finned tube and an air inlet pipe, wherein the air inlet pipe is arranged inside the finned tube and forms a preset gap with the finned tube; the pipe diameter of the finned tube is gradually reduced from the direction far away from the air outlet, wherein the rotational flow fins on the finned tube are arranged into a sectional structure. The utility model discloses can make leading-in tail gas take place to the mixed chamber casing and flow around to this mixed distance between extension tail gas and the urea makes urea and tail gas can mix fully, and then has the effect that improves the conversion rate, prevents the urea crystallization.

Description

Mixer structure for exhaust emission

Technical Field

The application relates to the technical field related to engine tail gas treatment, in particular to a mixer structure for tail gas emission.

Background

The exhaust gases of motor vehicles are generally treated by SCR technology to reduce the emission of nitrogen oxides (NOx), in particular by spraying an aqueous urea solution, which is vaporized and pyrolyzed to generate ammonia (NH) ₃ ) Ammonia gas reduces NOx to N in a catalyst ₂ 。

At present, when the existing tail gas emission mixer mixes tail gas and urea aqueous solution, a fluid retention area easily exists, so that the disturbance effect of the tail gas and the urea aqueous solution is poor, the mixing effect of the tail gas and the urea is poor, the concentration distribution is uneven, the conversion rate and the ammonia escape rate are unsatisfactory, and the defects of urea crystallization and the like are easily caused.

Disclosure of Invention

In view of the above, it is necessary to provide a mixer structure for exhaust gas emission for solving the above technical problems.

A mixer structure for tail gas emission comprises a mixing cavity shell, a mixing cavity assembly and a urea nozzle mounting seat, wherein the mixing cavity assembly and the urea nozzle mounting seat are arranged on the mixing cavity shell;

the mixing cavity assembly comprises a finned tube and an air inlet pipe, wherein the air inlet pipe is arranged inside the finned tube and forms a preset gap with the finned tube; the pipe diameter of the finned tube is gradually reduced from the direction far away from the air outlet, wherein the rotational flow fins on the finned tube are arranged into a sectional type structure.

In this application, through the reasonable structure setting of above-mentioned finned tube and air inlet pipe, utilize the structural feature of finned tube, can make leading-in to take place the bypass to mixing chamber casing internal exhaust to this mixed distance between extension tail gas and the urea makes urea and tail gas can mix fully, and then has the effect that improves the conversion rate, prevents the urea crystallization.

In one embodiment, the opening angle of the swirl fin on the finned tube is 25-35 degrees.

It can be understood that the opening angle of the swirl fin on the finned tube is set to be 25-35 degrees, so that the opening angle of the swirl fin on the finned tube is specifically set, and the tail gas guided into the finned tube can be ensured to generate the streaming.

In one embodiment, the number of the swirl fins is 8-12, wherein the length of each swirl fin is 20-60 mm.

It can be understood that the number of the swirl fins and the arrangement of the structural length are specifically realized through the structural arrangement.

In one embodiment, a plurality of through holes are formed in the end portion, facing the urea nozzle mounting seat, of the finned tube, and the through holes are distributed on the finned tube at intervals.

It can be understood that the risk of crystallization at the nozzle of the urea nozzle during the operation of the mixer structure can be reduced by forming the through holes on the finned tube, thereby further preventing the urea from crystallizing.

In one embodiment, the air inlet pipe is provided with a three-jaw connector, and the air inlet pipe is fixedly mounted on the finned pipe through the three-jaw connector.

It can be understood that the assembly connection between the air inlet pipe and the finned tube is realized through the structural arrangement of the three-jaw connecting piece, so that the assembly precision between the air inlet pipe and the finned tube is ensured, and the anti-seismic performance of the mixing cavity assembly is improved.

In one embodiment, the device further comprises a diversion cavity assembly and a connecting assembly, wherein the diversion cavity assembly is mounted on the finned tube through the connecting assembly, so that gas in the mixing cavity assembly can be discharged outwards through the diversion cavity assembly.

It can be understood that, through the structure setting of above-mentioned water conservancy diversion chamber subassembly and coupling assembling for this blender structure during operation can play the effect of water conservancy diversion with water conservancy diversion chamber subassembly to the outside emission of gas, with the reduction flow field resistance, reduces the effect of air current backpressure, can also make finally more even via this blender structure combustion gas distribution, and satisfy the effect of discharging the requirement simultaneously.

In one embodiment, the diversion cavity assembly includes a diversion housing, and an arc diversion surface is disposed on the diversion housing, and receives the gas discharged from the mixing cavity assembly and guides the gas to be discharged outwards.

It can be understood that, through the structural arrangement of the flow guide shell, the flow guide effect on gas when the flow guide cavity assembly works is realized, and the effect of simplifying the structure is achieved.

In one embodiment, the diversion cavity assembly further comprises a diversion cavity heat shield, and the diversion cavity heat shield is arranged to wrap the diversion shell.

It can be understood that through the structural arrangement of the heat shield of the flow guide cavity, the temperature loss of gas passing through the flow guide shell can be reduced, so that the urea atomization effect is improved, and the risk of urea crystallization is reduced.

In one embodiment, the connecting assembly comprises a clamp, and the diversion cavity assembly can be detachably mounted on the mixing cavity assembly through the clamp.

It can be understood that the structure arrangement of the hoop realizes the assembly connection of the connecting component to the diversion cavity component and the mixing cavity component, so as to facilitate the assembly connection between the diversion cavity component and the mixing cavity component; utilize the structural characteristic of clamp, can also be according to the demand that uses, adjust the effect of assembly angle between water conservancy diversion chamber subassembly and the hybrid chamber subassembly.

In one embodiment, the connecting assembly further comprises a first connecting pipe and a second connecting pipe, the first connecting pipe is fixedly installed on the finned tube, and the second connecting pipe is fixedly installed on the diversion cavity assembly;

the first connecting pipe and the second connecting pipe are fixedly connected through the clamp.

It can be understood that, through the structural arrangement of the first connecting pipe and the second connecting pipe, the structural arrangement of the clamp when the flow guide cavity assembly and the mixing cavity assembly are fixedly connected is specifically realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a mixer for exhaust emission according to an embodiment of the present disclosure.

Fig. 2 is a sectional view of a mixer structure for exhaust gas according to an embodiment of the present disclosure.

FIG. 3 is an exploded view of the mixing chamber assembly of the present application.

Reference numerals: 10. a mixing chamber housing; 11. an air outlet; 12. an air inlet; 13. a mixing chamber heat shield; 20. a mixing chamber assembly; 21. a finned tube; 211. swirl fins; 212. a through hole; 22. an air inlet hole pipe; 221. a three-jaw connector; 30. a urea nozzle mount; 40. a diversion cavity assembly; 41. a flow-guiding housing; 411. an arc-shaped flow guide surface; 42. the flow guide cavity is provided with a heat shield; 50. a connection assembly; 51. clamping a hoop; 52. a first connecting pipe; 53. a second connection pipe.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "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 "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 "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a mixer structure for exhaust emission is applied to automobile exhaust emission and handles, specifically can be with tail gas leading-in to this mixer structure to make tail gas and urea mix, then discharge the tail gas and the ammonia that obtain after the mixing process.

As shown in fig. 1 to 3, a mixer structure for exhaust emission according to an embodiment of the present disclosure includes a mixing chamber housing 10, a mixing chamber assembly 20 and a urea nozzle mounting seat 30 disposed on the mixing chamber housing 10, a diversion chamber assembly 40, and a connection assembly 50.

Wherein, one side of the mixing chamber assembly 20 is communicated with the air outlet 11 of the mixing chamber housing 10, and the other side is disposed facing the urea nozzle mounting seat 30. It should be noted that, the urea nozzle mounting seat 30 is specifically and fixedly mounted on one side of the mixing cavity housing 10 away from the air outlet 11, and is specifically used for assembling a urea nozzle, so that when the mixer structure works, the urea nozzle can spray urea aqueous solution into the mixing cavity assembly 20, so that urea and tail gas are mixed in the mixing cavity assembly 20, and nitrogen oxide contained in the tail gas is pyrolyzed.

In the present application, the mixing chamber assembly 20 includes a finned tube 21 and an air inlet pipe 22, the air inlet pipe 22 being installed inside the finned tube 21 with a predetermined gap from the finned tube 21; the pipe diameter of finned tube 21 reduces from the direction of keeping away from gas outlet 11 gradually, wherein, whirl fin 211 on the finned tube 21 sets up to the sectional type structure for this blender structure during operation, utilize the structural feature of finned tube 21, can make leading-in tail gas to the mixing chamber casing 10 take place the stream of detouring, with the mixing distance between this extension tail gas and the urea, make urea and tail gas can mix fully in this mixing chamber subassembly 20, and then have the effect that improves the conversion rate, prevent the urea crystallization. It should be noted that the fin fins 211 on the finned tube 21 of the present application may be provided in a two-stage configuration.

The opening angle of the swirl fin 211 on the finned tube 21 is 25-35 degrees, so that the opening angle of the swirl fin 211 on the finned tube 21 is specifically realized, and the tail gas guided into the finned tube can be ensured to generate the streaming.

Secondly, the number of the swirl fins 211 is 8-12, wherein the length of each swirl fin 211 is 20-60 mm, so that the number and the structural length of the swirl fins 211 are specifically set.

In an embodiment, the end portion of the finned tube 21 on one side facing the urea nozzle mounting seat 30 is provided with a plurality of through holes 212, and the through holes 212 are distributed on the finned tube at intervals, so that the risk of crystallization at the nozzle of the urea nozzle during the operation of the mixer structure can be reduced, and the function of further preventing urea crystallization is achieved.

Specifically, the through holes 212 of the present application are arranged as waist-shaped holes, and the plurality of waist-shaped holes are uniformly distributed on the finned tube 21, so that the structural arrangement of the through holes 212 is specifically realized, and the plurality of waist-shaped holes are uniformly distributed on the finned tube 21, which further plays a role in reducing urea crystals.

In an embodiment, the air inlet pipe 22 is provided with the three-jaw connector 221, and the air inlet pipe 22 is fixedly mounted on the finned tube 21 through the three-jaw connector 221, so that the assembly between the air inlet pipe 22 and the finned tube 21 is realized, and thus, not only is the assembly precision between the air inlet pipe 22 and the finned tube 21 ensured, but also the seismic performance of the mixing chamber assembly 20 is improved. In the present invention, the number of the three-jaw connectors 221 is two, one of the three-jaw connectors 221 is provided at an end portion of the air inlet pipe 22 facing the urea nozzle mount 30 and is attached to the small-diameter end portion of the fin pipe 21 by welding, and the other three-jaw connector 221 is provided so as to extend out of the fin pipe 21 and is attached to the connection block 50 by welding. It should be noted that the three-jaw connector 221 and the air inlet pipe 22 are connected together.

The utility model provides a water conservancy diversion chamber subassembly 40 is installed on finned tube 21 through coupling assembling 50, so that gas can outwards discharge through water conservancy diversion chamber subassembly 40 in the hybrid chamber subassembly 20, make this blender structure during operation, can play the effect of water conservancy diversion to the outside emission of gas with water conservancy diversion chamber subassembly 40, with reducing the flow field resistance, reduce the effect of air current backpressure, simultaneously can also make finally more even via the gas distribution of this blender structure combustion gas, and satisfy the effect of outwards discharging the requirement.

In an embodiment, the diversion cavity assembly 40 includes a diversion housing 41, an arc-shaped diversion surface 411 is disposed on the diversion housing 41, and the arc-shaped diversion surface 411 receives the gas discharged from the mixing cavity assembly 20 and guides the gas to be discharged outwards, so as to realize the diversion effect on the gas when the diversion cavity assembly 40 works, and have the effect of simplifying the structure. That is to say, when the diversion cavity assembly 40 works, diversion of the gas to be discharged outwards can be realized by arranging the arc diversion surfaces 411 with different radians on the diversion shell 41 according to the use requirement. It should be noted that the arc-shaped guiding surface 411 of the guiding housing 41 of this embodiment can guide the gas to be discharged in a direction perpendicular to the direction of the gas flow in the mixing chamber assembly 20. The gas is specifically a mixture of the off gas and ammonia gas.

Wherein, this water conservancy diversion chamber subassembly 40 still includes water conservancy diversion chamber heat shield 42, and water conservancy diversion chamber heat shield 42 parcel draft shell 41 sets up, utilizes water conservancy diversion chamber heat shield 42 to the heat preservation operation of draft shell 41, can reduce the temperature loss of gas when passing through draft shell 41 like this to this improves urea atomization effect, and reduces the risk of urea crystallization.

Similarly, the mixing chamber housing 10 is also covered with the mixing chamber heat shield 13 to keep the temperature of the mixing chamber housing 10 warm, so that the temperature loss of the exhaust gas introduced through the air inlet 12 of the mixing chamber housing 10 can be reduced. It should be noted that, in the mixing chamber housing 10 of the present application, the air inlet 12 is disposed in the radial direction of the finned tube 21, and the aperture of the air inlet 12 is larger than the aperture of the air outlet 11, so as to increase the flow velocity of the tail gas in the mixing chamber assembly 20, and have an effect of further improving the mixing effect of the tail gas and the urea.

In an embodiment, the connection assembly 50 includes a clamp 51, the diversion cavity assembly 40 can be detachably installed on the mixing cavity assembly 20 through the clamp 51, thereby specifically realizing the structural arrangement of the connection assembly 50, so as to facilitate the assembly connection between the diversion cavity assembly 40 and the mixing cavity assembly 20, and utilize the structural characteristics of the clamp 51, so that the assembly angle between the diversion cavity assembly 40 and the mixing cavity assembly 20 can also be adjusted according to the use requirement, it should be noted that, the diversion cavity assembly 40 and the mixing cavity assembly 20 are connected by the clamp 51, the structure is simplified, the disassembly and assembly are convenient, and the clamp 51 can also be used on the spot, thereby reducing the cost.

The connecting assembly 50 further comprises a first connecting pipe 52 and a second connecting pipe 53, the first connecting pipe 52 is fixedly mounted on the finned tube 21, the second connecting pipe 53 is fixedly mounted on the diversion chamber assembly 40, and the first connecting pipe 52 and the second connecting pipe 53 are fixedly connected through a hoop 51, so that the structural arrangement of the hoop 51 when the diversion chamber assembly 40 and the mixing chamber assembly 20 are fixedly connected is specifically realized. It should be noted that, in the present application, the first connecting pipe 52 may be configured as a taper pipe structure, and the first connecting pipe 52 and the finned tube 21 are connected and fixed by welding, the second connecting pipe 53 is mounted on the diversion shell 41 of the diversion chamber assembly 40 by welding, and the first connecting pipe 52 and the second connecting pipe 53 are partially overlapped and the overlapped parts are connected and fixed by the clamp 51.

To sum up, the utility model discloses a mixer structure is through reasonable structure setting for this mixer structure during operation can realize the intensive mixing to tail gas and urea, and then has the effect that improves the conversion rate, prevents the urea crystallization.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments 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 application shall be subject to the appended claims.

Claims

1. A mixer structure for tail gas emission comprises a mixing cavity shell (10), a mixing cavity assembly (20) and a urea nozzle mounting seat (30), wherein the mixing cavity assembly (20) and the urea nozzle mounting seat (30) are arranged on the mixing cavity shell (10), one side of the mixing cavity assembly (20) is communicated with a gas outlet (11) of the mixing cavity shell (10), and the other side of the mixing cavity assembly is arranged facing the urea nozzle mounting seat (30);

the mixing chamber component (20) is characterized by comprising a finned tube (21) and an air inlet hole tube (22), wherein the air inlet hole tube (22) is arranged inside the finned tube (21) and forms a preset gap with the finned tube (21); the pipe diameter of the finned tube (21) is gradually reduced from the direction far away from the air outlet (11), wherein the rotational flow fins (211) on the finned tube (21) are arranged to be of a sectional structure.

2. The mixer structure for exhaust emission according to claim 1, wherein an opening angle of the swirl fin (211) on the fin tube (21) is 25 ° to 35 °.

3. The mixer structure for exhaust gas emission according to claim 1, wherein the number of the swirl fins (211) is 8 to 12, wherein the length of each swirl fin (211) is 20mm to 60mm.

4. The mixer structure for exhaust emission according to claim 1, wherein the finned tube (21) has a plurality of through holes (221) opened at one end portion thereof facing the urea nozzle mount (30), and the plurality of through holes (221) are distributed at intervals on the finned tube (21).

5. The mixer structure for exhaust emission according to claim 1, wherein a three-jaw connector (221) is provided on the air inlet hole pipe (22), and the air inlet hole pipe (22) is fixedly mounted on the fin pipe (21) through the three-jaw connector (221).

6. The mixer structure for exhaust emission according to claim 1, further comprising a guide chamber assembly (40) and a connection assembly (50), wherein the guide chamber assembly (40) is mounted on the finned tube (21) through the connection assembly (50) so that the gas in the mixing chamber assembly (20) can be discharged outside through the guide chamber assembly (40).

7. The mixer structure for exhaust emission according to claim 6, wherein the guide chamber assembly (40) includes a guide housing (41), and an arc guide surface (411) is disposed on the guide housing (41), and the arc guide surface (411) receives the gas discharged from the mixing chamber assembly (20) and guides the gas to be discharged to the outside.

8. The mixer structure for exhaust emission according to claim 7, wherein the diversion cavity assembly (40) further comprises a diversion cavity heat shield (42), and the diversion cavity heat shield (42) is disposed to wrap the diversion housing (41).

9. The mixer structure for exhaust emission according to claim 6, wherein the connection assembly (50) includes a clip (51), and the baffle chamber assembly (40) is detachably mountable to the mixing chamber assembly (20) through the clip (51).

10. The mixer structure for exhaust emission according to claim 9, wherein the connection assembly (50) further includes a first connection pipe (52) and a second connection pipe (53), the first connection pipe (52) being fixedly mounted on the fin tube (21), the second connection pipe (53) being fixedly mounted on the guide chamber assembly (40);

the first connecting pipe (52) and the second connecting pipe (53) are fixedly connected through the clamp (51).