CN210686097U

CN210686097U - Mixing device

Info

Publication number: CN210686097U
Application number: CN201921901013.0U
Authority: CN
Inventors: 张强; 王杰; 黄晓巍; 王世杰
Original assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Current assignee: Faurecia Emissions Control Technologies Development Shanghai Co Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-06-05
Anticipated expiration: 2029-11-06

Abstract

The utility model provides a mixer, it includes urceolus, inner tube assembly and whirl device, the closed tubular structure of tip opening and back tip before the inner tube assembly, the inner tube assembly is installed in the urceolus, the preceding tip of inner tube assembly with the internal face laminating of urceolus is fixed, makes the preceding tip of inner tube assembly with cavity before forming between the urceolus, the inner tube assembly with form the back cavity between the urceolus, whirl device installs perpendicularly in the inner tube assembly. The utility model discloses a to inner structure optimization, methods such as design upgrading to promote the anti crystallization ability of blender, respond to the challenge of six products in the country. The mixer is simple in structure, and after the mixer is processed through the inline structure, the problem of crystallization and precipitation can be effectively solved with low cost and compact space, and the national emission standard is met.

Description

Mixing device

Technical Field

The utility model relates to an automobile exhaust handles the field, in particular to blender.

Background

In the prior art, the current commercial vehicle market employs metal mechanical structures to direct the mixing of the after-treatment exhaust gases with a 32.5% urea aqueous solution. In general, a mixer adopts structures such as a pore plate, a circular barrel and a special-shaped blade to guide airflow to rotate, fully mix with the urea aqueous solution, and crush the urea aqueous solution at a specific structure to decompose the urea aqueous solution, thereby achieving the purpose of gasifying the urea aqueous solution.

However, as emissions regulations escalate, lower temperatures, more compact spaces, and higher urea injection quantities present higher challenges to existing designs. Current mechanical structures can't decompose higher urea aqueous solution completely to easily produce the crystallization, block up the blender, increase the backpressure of aftertreatment ware, thereby influence the performance of aftertreatment ware.

In view of the above, those skilled in the art have developed mixer structures in an attempt to overcome the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that it is easy in order to overcome the unable higher urea water of decomposing completely of mixer structure among the prior art, produce the crystallization easily, block up defects such as blender, provide a mixer.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

the mixer is characterized by comprising an outer cylinder, an inner cylinder assembly and a cyclone device, wherein the inner cylinder assembly is of a cylindrical structure with an opening at the front end and a closed rear end, the inner cylinder assembly is installed in the outer cylinder, the front end of the inner cylinder assembly is fixedly attached to the inner wall surface of the outer cylinder, a front cavity is formed between the front end of the inner cylinder assembly and the outer cylinder, a rear cavity is formed between the inner cylinder assembly and the outer cylinder, and the cyclone device is vertically installed in the inner cylinder.

According to the utility model discloses an embodiment, the inner tube assembly includes inner tube, inlet end cover and rear end cap, the inlet end cover is installed the front end of inner tube, just the inlet end cover with the internal face fixed connection of urceolus, and seal the rear cavity, the guide air current gets into in the front cavity, the rear end cap is fixed the rear end of inner tube.

According to one embodiment of the present invention, the diameter of the inner cylinder is 70% -80% of the diameter of the outer cylinder.

According to an embodiment of the present invention, the mounting position of the inner cylinder is opposite to that of the outer cylinder.

According to the utility model discloses an embodiment, the surface of rear end cap is arc surface, plane or curved surface.

According to the utility model discloses an embodiment, the swirl device includes cyclone tube and wire net, the wire net is fixed the bottom of cyclone tube, the top of swirl device is fixed extremely the last internal face of inner tube, swirl device's bottom is fixed extremely the lower internal face of inner tube.

According to an embodiment of the utility model, the upper portion of whirl pipe encircles and is provided with a plurality of whirl pipe blades, the opening angle of whirl pipe blade is 20-45.

According to the utility model discloses an embodiment, the wire net is the 3D network structure of wave type.

According to an embodiment of the present invention, the mixer further comprises a fan-shaped blade installed at a lower end of the rear end of the inner tube.

According to an embodiment of the present invention, the mixer further comprises a nozzle holder fixed on the outer cylinder and located above the swirling device.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses the blender is through optimizing internal structure, methods such as design upgrading to promote the anti crystallization ability of blender, respond to the challenge of six products in the country. The mixer is simple in structure, and after the mixer is processed through the inline structure, the problem of crystallization and precipitation can be effectively solved with low cost and compact space, and the national emission standard is met.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:

fig. 1 is a perspective view of the mixer of the present invention.

Fig. 2 is a front view of the mixer of the present invention.

Fig. 3 is a rear view of the mixer of the present invention.

Fig. 4 is an exploded view of the mixer of the present invention.

Fig. 5 is a schematic view of the flow of the air in the mixer of the present invention.

[ reference numerals ]

Outer cylinder 10

Inner barrel assembly 20

Swirling device 30

Front cavity A

Rear cavity B

Inner cylinder 21

Air inlet end cap 22

Rear end cap 23

Swirl tube 31

Wire mesh 32

Swirl tube vanes 311

Nozzle holder 40

Fan-shaped blade 50

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 1 is a perspective view of the mixer of the present invention. Fig. 2 is a front view of the mixer of the present invention. Fig. 3 is a rear view of the mixer of the present invention. Fig. 4 is an exploded view of the mixer of the present invention. Fig. 5 is a schematic view of the flow of the air in the mixer of the present invention.

As shown in fig. 1 to 5, the utility model discloses a mixer, it includes urceolus 10, inner tube assembly 20 and whirl device 30, inner tube assembly 20 is preceding tip opening and the closed tubular structure of back tip, installs inner tube assembly 20 in urceolus 10, and the preceding tip of inner tube assembly 20 is fixed with the laminating of the internal face of urceolus 10 for cavity A before forming between the preceding tip of inner tube assembly 20 and urceolus 10, cavity B after forming between inner tube assembly 20 and the urceolus 10, install whirl device 30 in inner tube assembly 20 perpendicularly.

Preferably, the inner cylinder assembly 20 includes an inner cylinder 21, an air inlet cover 22 and a rear cover 23, the air inlet cover 22 is installed at the front end of the inner cylinder 21, the air inlet cover 22 is fixedly connected with the inner wall surface of the outer cylinder 10 and closes the rear cavity B to guide the airflow into the front cavity a, and the rear cover 23 is fixed at the rear end of the inner cylinder 21.

Specifically, a rear end cap 23 is welded to the rear end of the inner barrel 21 for sealing the inner chamber to ensure complete flow of gas from the interior of the swirling device 30 to the rear end. An inlet end cover 22 is mounted on the front end of the inner cylinder 21 for connecting the inner cylinder 21 and the outer cylinder 10 and closing a cavity (i.e., a rear cavity B) in the middle of the inner and outer cylinders.

The rear end cap 23 is here preferably an eccentric end cap welded to the rear end of the inner barrel 21 for sealing the inner chamber and thereby ensuring that the airflow is completely circulated from the interior of the swirl tube to the rear end.

Further, the diameter of the inner cylinder 21 is 70% -80% of the diameter of the outer cylinder 10. Meanwhile, the mounting position of the inner cylinder 21 is an eccentric mounting structure relative to the outer cylinder 10, which is used for ensuring the longest air flow path. The outer surface of the rear end cap 23 may preferably be a circular arc, a flat surface, or a curved surface.

More preferably, the swirling device 30 includes a swirling pipe 31 and a steel mesh 32, the steel mesh 32 is fixed at the bottom of the swirling pipe 31, the top of the swirling device 30 is fixed to the upper inner wall surface of the inner cylinder 21, and the bottom of the swirling device 30 is fixed to the lower inner wall surface of the inner cylinder 21.

The upper part of the cyclone tube 31 is uniformly provided with a plurality of cyclone tube blades 311 in a surrounding manner, the opening angle of the cyclone tube blades 311 is preferably 20-45 degrees, the cyclone tube blades 311 are uniformly distributed at the upper end of the cyclone tube 31, and the number of the cyclone tube blades 311 can be set to be 8-16, so that good airflow direction and low back pressure are ensured.

The steel mesh 32 is preferably a 3D mesh structure of the wave type. The steel wire mesh 32 is fixed at the bottom of the cyclone tube 31 and is used for crushing and mixing urea and waste gas.

The steel wire mesh 32 may be made of thin-diameter steel wires of 316 or 304 material, preferably, by a drawing process, to form a wave-shaped 3D mesh structure, which provides more specific surface area in a limited space, thereby increasing the heat exchange area between urea droplets and exhaust gas. It is preferably used in an amount of 0.23g to 0.4/cm³Density, on the premise of ensuring the anti-crystallization capacity, the back pressure of the system is effectively controlled.

The mixer further includes a nozzle holder 40, and the nozzle holder 40 is fixed to the outer tub 10 above the swirling device 30. The nozzle holder 40 is preferably fixed to the upper end of the skin 10 using a stainless steel casting process, wherein the mounting position ensures that the nozzle spray is centered on the swirl tube 31,

in addition, the mixer further includes a fan-shaped blade 50, and the fan-shaped blade 50 is installed at the lower end portion of the rear end of the inner cylinder 21 to guide the airflow entering the rear chamber B, so that NH3 UI (uniformity of distribution of ammonia gas) can be improved.

According to the above structural description, as shown in fig. 1, the arrow a of the mixer of the present invention represents that the exhaust gas enters the mixer, the arrow b represents that the urea aqueous solution is sprayed into the mixer from top to bottom, and the arrow c represents that the gas mixed by the exhaust gas and the urea aqueous solution enters the SCR (selective catalytic reduction) carrier.

As shown in FIG. 5, in the mixer of the present invention, the waste gas enters the inner barrel 21 from the front cavity A, and through the swirl tube 31, the urea aqueous solution (e.g. 32.5%) is sprayed into the swirl tube 31 from the top by the nozzle holder 40 to mix with the waste gas. Simultaneously, urea is hydrolyzed, and the pyrolysis is the ammonia, through blender inner structure water conservancy diversion vortex effect, makes ammonia and waste gas intensive mixing, improves the ammonia degree of consistency in getting into the SCR effectively, promotes reaction efficiency. Then, the mixer flows downwards from the steel wire mesh 32 into the rear cavity B, and finally flows out from the rear end of the outer barrel 10.

The utility model discloses the inside of blender adopts the cyclone tube, carries out the vortex to the air current, makes the air current in the cyclone tube with NH₃And (4) fully mixing. Adding a steel wire mesh at the tail end of the cyclone tube, and adding NH₃And mixing with the airflow again to solve the problem of precipitation. It adopts circular shape inner tube, can guide gaseous entering cyclone tube more effectively, realizes adopting less guider (for example fan-shaped blade) to improve NH3 UI (ammonia distribution degree of consistency).

To sum up, the utility model discloses the blender is through calculating the exhaust flow, and temperature and urea injection volume generate EAR value and are used for assessing the anti crystallization risk of treater around now. On the premise that the EAR value is generally low at present, the anti-crystallization capacity of the mixer is improved by methods such as internal structure optimization and design upgrading of the mixer, and the mixer is suitable for the challenge of products in China.

The mixer is simple in structure, and after the mixer is processed through the inline structure, the problem of crystallization and precipitation can be effectively solved with low cost and compact space, and the national emission standard is met.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.

Claims

1. The mixer is characterized by comprising an outer cylinder, an inner cylinder assembly and a cyclone device, wherein the inner cylinder assembly is of a cylindrical structure with an opening at the front end and a closed rear end, the inner cylinder assembly is installed in the outer cylinder, the front end of the inner cylinder assembly is fixedly attached to the inner wall surface of the outer cylinder, a front cavity is formed between the front end of the inner cylinder assembly and the outer cylinder, a rear cavity is formed between the inner cylinder assembly and the outer cylinder, and the cyclone device is vertically installed in the inner cylinder assembly.

2. The mixer of claim 1 wherein the inner barrel assembly includes an inner barrel, an inlet end cap mounted to a front end of the inner barrel and fixedly attached to an inner wall surface of the outer barrel and enclosing the rear cavity to direct the airflow into the front cavity, and a rear end cap secured to a rear end of the inner barrel.

3. The mixer of claim 2, wherein the diameter of the inner barrel is 70% to 80% of the diameter of the outer barrel.

4. The mixer of claim 3 wherein said inner barrel is mounted in an eccentric configuration relative to said outer barrel.

5. The mixer of claim 2 wherein the outer surface of the rear end cap is radiused, planar or curved.

6. The mixer of claim 1, wherein the swirling device comprises a swirling tube and a steel mesh, the steel mesh is fixed to a bottom of the swirling tube, a top of the swirling device is fixed to an upper inner wall surface of the inner barrel, and a bottom of the swirling device is fixed to a lower inner wall surface of the inner barrel.

7. The mixer of claim 6, wherein the swirl tube is provided at an upper portion thereof with a plurality of swirl tube blades circumferentially arranged, and the swirl tube blades have an opening angle of 20 ° to 45 °.

8. The mixer of claim 6, wherein the steel mesh is a wave-shaped 3D mesh structure.

9. The mixer of claim 1 further comprising fan blades mounted at a lower end of the rear end of the inner barrel.

10. The mixer of claim 2 further comprising a nozzle mount secured to the outer barrel above the swirl device.