CN213450559U

CN213450559U - Mixer assembly and exhaust aftertreatment package

Info

Publication number: CN213450559U
Application number: CN202022664238.8U
Authority: CN
Inventors: 孙强; 吴涛涛; 金华; 凌睿
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-06-15
Anticipated expiration: 2030-11-17

Abstract

A mixer assembly is used for being matched with a urea nozzle and comprises a cyclone tube extending along the axial direction, the cyclone tube is formed by combining components which have the same structures and can be shared by at least two parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops. The utility model discloses still relate to a tail gas aftertreatment encapsulation including above-mentioned blender subassembly. Compared with the prior art, the utility model discloses a spiral-flow tube adopts the same and part combination that can realize the part sharing of two at least partial structures to form, has reduced the complexity of structure to the cost is reduced.

Description

Mixer assembly and exhaust aftertreatment package

Technical Field

The utility model relates to a blender subassembly and tail gas aftertreatment encapsulation belongs to engine exhaust aftertreatment technical field.

Background

Existing exhaust aftertreatment packages typically include a mixer assembly including a mixing tube to mix the exhaust with urea droplets to facilitate evaporation of the urea droplets, reduce urea crystallization risk, and improve the performance of the exhaust aftertreatment package. However, the mixing tube in the prior art has a complex structure and high cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lower blender subassembly of cost and tail gas aftertreatment encapsulation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a mixer assembly is used for being matched with a urea nozzle and comprises a cyclone tube extending along the axial direction, the cyclone tube is formed by combining components which have the same structures and can be shared by at least two parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops.

As a technical scheme of the utility model further improved, the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side is equipped with to the sunken first depressed part that forms of direction of interior cavity, first depressed part with the second side has formed jointly airflow inlet.

As a technical scheme of the utility model further improved, the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side is equipped with to keeping away from the convex first bellying of direction of interior cavity, first bellying with the second side has formed jointly airflow inlet.

As a technical scheme of the utility model further improved, the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side is equipped with to the sunken first depressed part that forms of direction of interior cavity, the second side is equipped with and keeps away from the convex second bellying of direction of interior cavity, first depressed part with the second bellying has formed jointly airflow inlet.

As a further improved technical solution of the present invention, the spiral-flow tube corresponds to the outer surface of the region where the airflow inlet is located is conical or cylindrical.

As a further improved technical solution of the present invention, the mixer assembly includes a porous crushing pipe connected to the cyclone pipe and located at the downstream of the cyclone pipe.

As the utility model discloses further modified technical scheme, the blender subassembly is including cup jointing the cyclone tube with mixing tube on the porous broken pipe.

As a further improved technical scheme of the utility model, porous broken pipe is kept away from the one end of whirl pipe is equipped with a plurality of installation claws, the installation claw is fixed on the inner wall of hybrid tube.

As a further improved technical scheme of the utility model, the blender subassembly still include the casing and with the hybrid tube is connected and is located the extension pipe in the upper reaches of hybrid tube, the casing be equipped with the air current cavity that the air current entry is linked together, the extension pipe is followed the protruding income of axial of whirl pipe in the air current cavity.

The utility model also discloses an exhaust aftertreatment encapsulation, it include the diesel oxidation catalyst converter, with the diesel oxidation catalyst converter links to each other and is located the diesel particulate trap in the low reaches of diesel oxidation catalyst converter, with the mixer subassembly that the diesel particulate trap links to each other and with the mixer subassembly links to each other and is located the selectivity catalytic reduction agent in the low reaches of mixer subassembly, the mixer subassembly is aforementioned mixer subassembly.

Compared with the prior art, the utility model discloses a spiral-flow tube adopts the same and part combination that can realize the part sharing of two at least partial structures to form, has reduced the complexity of structure to the cost is reduced.

Drawings

Fig. 1 is a schematic diagram of the exhaust aftertreatment package of the present invention.

Fig. 2 is a schematic cross-sectional view of a mixer assembly of the present invention in one embodiment.

Fig. 3 is an exploded perspective view of the mixer assembly of the present invention.

Fig. 4 is a partially exploded perspective view of the mixer assembly of the present invention.

FIG. 5 is a schematic perspective view of the swirl tube and perforated breaker tube when connected together.

FIG. 6 is a top view of the perforated crash tube of FIG. 5 removed.

Fig. 7 is an exploded view of fig. 6.

FIG. 8 is an exploded perspective view of the swirl tube.

Figure 9 is a perspective view of another embodiment of the mixer assembly of the present invention.

Fig. 10 is a front view of fig. 9.

Fig. 11 is a schematic sectional view taken along line a-a in fig. 9.

FIG. 12 is a schematic perspective view of another embodiment of a swirl tube.

Fig. 13 is an exploded perspective view of fig. 12.

Detailed Description

Referring to fig. 1, the present invention discloses an exhaust gas aftertreatment package, which includes a Diesel Oxidation Catalyst (DOC)1, a Diesel Particulate Filter (DPF)2 connected to the diesel oxidation catalyst 1 and located at a downstream of the diesel oxidation catalyst 1, a mixer assembly 3 connected to the diesel particulate filter 2, and a Selective Catalytic Reduction (SCR)4 connected to the mixer assembly 3 and located at a downstream of the mixer assembly 3.

Referring to fig. 2 to 13, the mixer assembly 3 includes a housing 5, a mixing tube 6 connected to the housing 5, and a cyclone tube 7 located in the mixing tube 6. The housing 5 is provided with an airflow cavity 51 for letting the exhaust gas flow in. The exhaust gas flows into the gas flow chamber 51 and then flows through the mixer assembly 3. The mixer component 3 is used for being matched with the urea nozzle 8, the urea nozzle 8 is used for spraying atomized urea liquid drops into the cyclone tube 7, and tail gas is mixed with the urea liquid drops under the guidance of the mixer component 3 so as to realize the evaporation of the urea liquid drops.

In the embodiment of the present invention, the swirl tube 7 extends axially, and the swirl tube 7 is formed by combining at least two parts 71 which have the same structure and can be shared by parts. The swirl tube 7 comprises an inner cavity 70 and the urea nozzle 8 is arranged to spray atomized urea droplets into the inner cavity 70. The joint of two adjacent parts 71 forms an airflow inlet 72 communicated with the inner cavity 70. The airflow inlet 72 communicates with the airflow chamber 51. The gas stream inlet 72 is configured to introduce a gas stream into the inner cavity 70 in a clockwise or counterclockwise direction and mix with the urea droplets.

In an embodiment of the present invention, the mixer assembly 3 further comprises a perforated crushing pipe 91 connected to the swirl pipe 7 and located downstream of the swirl pipe 7, and an extension pipe 92 connected to the mixing pipe 6 and located upstream of the mixing pipe 6. The mixing pipe 6 is sleeved on the cyclone pipe 7 and the porous crushing pipe 91. One end of the porous crushing pipe 91, which is far away from the cyclone pipe 7, is provided with a plurality of mounting claws 911, and the mounting claws 911 are fixed on the inner wall of the mixing pipe 6.

In one embodiment of the present disclosure, the swirl tube 7 is partially inserted into the perforated crushing tube 91 and fixed by welding. The extension pipe 92 is partially inserted and installed in the mixing pipe 6 and fixed by welding. The extension tube 92 protrudes into the airflow cavity 51 in the axial direction of the swirl tube 7, and the extension tube 92 is at least partially wrapped around the periphery of the airflow inlet 72. So set up, extension pipe 92 can avoid getting into the tail gas in the airflow cavity 51 directly washes into in the cyclone tube 7. In fact, the exhaust gas entering the gas flow chamber 51 needs to bypass the extension tube 92 and then flow into the inner chamber 70 in a swirling manner from the gas flow inlet 72. This design is beneficial for improving the uniformity of the airflow distribution.

The outer surface of the cyclone tube 7 in the area corresponding to the gas flow inlet 72 is conical (as shown in fig. 5) or cylindrical (as shown in fig. 9).

The number of the parts 71 is two or more. As shown in fig. 5 to 11, the number of the parts 71 is three; referring to fig. 12 and 13, the number of the parts 71 is four.

Specifically, referring to fig. 8, in an embodiment of the present invention, the component 71 includes a first component 711 and a second component 712 adjacent to the first component 711, the first component 711 is provided with a first side 7111 close to the airflow inlet 72, the second component 712 is provided with a second side 7121 close to the airflow inlet 72, wherein the first side 7111 is provided with a first concave portion 7112 concavely formed in the direction of the inner cavity 70, and the first concave portion 7112 and the second side 7121 together form the airflow inlet 72.

Specifically, referring to fig. 12 and 13, in another embodiment of the present invention, the component 71 includes a first component 711 and a second component 712 adjacent to the first component 711, the first component 711 is provided with a first side 7111 close to the airflow inlet 72, the second component 712 is provided with a second side 7121 close to the airflow inlet 72, wherein the first side 7111 is provided with a first protrusion 7113 protruding in a direction away from the inner cavity 70, and the first protrusion 7113 and the second side 7121 together form the airflow inlet 72.

It is understood that in other embodiments, the member 71 includes a first member 711 and a second member 712 adjacent to the first member 711, the first member 711 is provided with a first side 7111 close to the airflow inlet 72, the second member 712 is provided with a second side 7121 close to the airflow inlet 72, wherein the first side 7111 is provided with a first concave portion 7112 concavely formed in the direction of the inner cavity 70, the second side 7121 is provided with a second convex portion (similar to the first convex portion 7113 in fig. 12 and 13) protruding in the direction away from the inner cavity 70, and the first concave portion 7112 and the second convex portion together form the airflow inlet 72.

Compared with the prior art, the utility model discloses a cyclone tube 7 adopts the same and part 71 combination that can realize the part sharing of two at least part structures to form, has reduced the complexity of structure and technology to the cost is reduced.

The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the present invention in detail with reference to the above embodiments, the skilled personnel in the art should understand that the technical personnel in the technical field can still modify or substitute the present invention, and all the technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A mixer assembly is used for being matched with a urea nozzle and is characterized by comprising a cyclone tube extending along the axial direction, wherein the cyclone tube is formed by combining at least two parts which have the same structure and can be shared by parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops.

2. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side be equipped with to the sunken first depressed part that forms of direction of interior cavity, first depressed part with the second side has formed jointly airflow inlet.

3. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that the first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side is equipped with to keeping away from the convex first bellying of direction of interior cavity, first bellying with the second side has formed jointly airflow inlet.

4. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side be equipped with to the sunken first depressed part that forms of direction of interior cavity, the second side is equipped with to keeping away from the convex second bellying of direction of interior cavity, first depressed part with the second bellying has formed jointly airflow inlet.

5. The mixer assembly according to claim 1, wherein: the outer surface of the cyclone tube corresponding to the area where the airflow inlet is located is conical or cylindrical.

6. The mixer assembly according to claim 1, wherein: the mixer subassembly include with the cyclone tube is connected and is located the broken pipe of porous of cyclone tube's low reaches, the mixer subassembly is including cup jointing the cyclone tube with mixing tube on the broken pipe of porous.

7. The mixer assembly according to claim 1, wherein: the cyclone tube is formed by combining three parts or four parts which have the same structure and can realize the sharing of parts.

8. The mixer assembly according to claim 6, wherein: one end of the porous crushing pipe, which is far away from the cyclone pipe, is provided with a plurality of mounting claws, and the mounting claws are fixed on the inner wall of the mixing pipe.

9. The mixer assembly according to claim 6, wherein: the blender subassembly still includes the casing and with the hybrid tube is connected and is located the extension pipe in the upper reaches of hybrid tube, the casing be equipped with the air current cavity that the air current entry is linked together, the extension pipe is followed the protruding income of axial of whirl pipe in the air current cavity.

10. An exhaust aftertreatment package comprising a diesel oxidation catalyst, a diesel particulate trap connected to and downstream of the diesel oxidation catalyst, a mixer assembly connected to the diesel particulate trap, and a selective catalytic reduction agent connected to and downstream of the mixer assembly, wherein the mixer assembly is according to any one of claims 1 to 9.