CN213654960U - Mixer assembly and exhaust aftertreatment package - Google Patents

Abstract

A mixer assembly is used for being matched with a urea nozzle and comprises a mixing pipe and a cyclone pipe which is positioned in the mixing pipe and extends along the axial direction, wherein the cyclone pipe comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; 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 airflow cavity that the whirl pipe is linked together, the extension pipe is followed the protruding income of axial of whirl pipe in the airflow cavity. The utility model discloses still relate to a tail gas aftertreatment encapsulation that has above-mentioned blender subassembly. Compared with the prior art, the utility model discloses a set up the edge protruding income of axial of whirl pipe extension in the airflow cavity, the tail gas of having avoided getting into in the airflow cavity rushes into the whirl pipe to the homogeneity of air current has been improved.

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

The existing exhaust aftertreatment package typically includes a mixer assembly including a swirl tube for mixing exhaust gas with urea droplets to promote evaporation of the urea droplets, reduce urea crystallization risk, and improve the performance of the exhaust aftertreatment package. However, how to improve the uniformity of the tail gas entering the cyclone tube is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a better blender subassembly of homogeneity 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 mixing pipe and a cyclone pipe which is positioned in the mixing pipe and extends along the axial direction, wherein the cyclone pipe comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; 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 airflow cavity that the whirl pipe is linked together, the extension pipe is followed the protruding income of axial of whirl pipe in the airflow cavity.

As a further improved technical scheme of the utility model, the cyclone tube be equipped with a plurality of air current entry that the air current cavity is linked together, the outward appearance of cyclone tube is the toper or cylindrical.

As a further improved technical scheme of the utility model, at least part of the extension pipe is wrapped on the periphery of the airflow inlet.

As a further improved technical solution of the utility model, the mixer subassembly include with the cyclone tube is connected and is located the porous broken pipe in the low reaches of cyclone tube, porous broken pipe is located in the mixing tube.

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 spiral-flow tube part is inserted and is installed among the porous broken pipe and fix through the welding.

As a further improved technical solution of the present invention, the extension pipe portion is inserted and installed in the mixing pipe and fixed by welding.

As a further improved technical solution of the present invention, the mixer assembly includes a porous crushing pipe passing through the cyclone pipe, the porous crushing pipe includes a first porous pipe section located in the cyclone pipe, a second porous pipe section located in the mixing pipe, and a tapered section connecting the first porous pipe section and the second porous pipe section.

As a further improved technical scheme of the utility model, the diameter of second porous pipeline section is greater than the diameter of first porous pipeline section.

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 set up the edge protruding income of axial of whirl pipe extension in the airflow cavity, the tail gas of having avoided getting into in the airflow cavity rushes into the whirl pipe to improve the homogeneity of air current, be favorable to improving the performance, reduce urea crystallization risk.

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 a first embodiment.

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

Figure 4 is a top view of a mixer assembly of the present invention in a second embodiment.

Fig. 5 is a schematic sectional view taken along line a-a in fig. 4.

Fig. 6 is a schematic sectional view taken along line B-B in fig. 4.

Fig. 7 is a partially enlarged view of a picture frame portion C of fig. 6.

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. 1 to 7, 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 illustrated embodiment of the present invention, the swirl tube 7 extends axially, and the swirl tube 7 comprises an inner cavity 70 and an air inlet 72. The urea nozzle 8 is configured to spray atomized urea droplets into 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 910, and the mounting claws 910 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 region corresponding to the gas flow inlet 72 is conical (as shown in fig. 2) or cylindrical (as shown in fig. 7).

Referring to fig. 4 to 7, in another embodiment of the present invention, the mixer assembly 3 includes a perforated crushing pipe 91 passing through the cyclone pipe 7, and the perforated crushing pipe 91 includes a first perforated pipe segment 911 located in the cyclone pipe 7, a second perforated pipe segment 912 located in the mixing pipe 6, and a tapered segment 913 connecting the first perforated pipe segment 911 and the second perforated pipe segment 912. The diameter of the second porous tube segment 912 is greater than the diameter of the first porous tube segment 911. With this arrangement, the area covered by the urea droplets ejected from the urea nozzle 8 can be enlarged, so that the urea droplets are better dispersed, and the risk of urea crystallization due to the local ejection of excessive urea droplets is reduced.

The utility model discloses a set up the edge protruding income of axial of whirl pipe 7 extension 92 in the air current cavity 51 has avoided getting into the tail gas among the air current cavity 51 and has gone into among the whirl pipe 7 to improve the homogeneity of air current, be favorable to improving the performance, reduce urea crystallization risk.

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 (10)

1. A mixer assembly is used for being matched with a urea nozzle and comprises a mixing pipe and a cyclone pipe which is positioned in the mixing pipe and extends along the axial direction, wherein the cyclone pipe comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the mixer assembly is characterized by further comprising a shell and an extension pipe, wherein the extension pipe is connected with the mixing pipe and is located at the upper stream of the mixing pipe, the shell is provided with an airflow cavity communicated with the cyclone pipe, and the extension pipe extends into the airflow cavity in a protruding mode in the axial direction of the cyclone pipe.

2. The mixer assembly according to claim 1, wherein: the cyclone tube is provided with a plurality of airflow inlets communicated with the airflow cavity, and the outer surface of the cyclone tube is conical or cylindrical.

3. The mixer assembly according to claim 2, wherein: the extension pipe is at least partially wrapped around the periphery of the airflow inlet.

4. The mixer assembly according to claim 1, wherein: the mixer subassembly include with the whirl pipe is connected and is located the broken pipe of porous of the low reaches of whirl pipe, the broken pipe of porous is located in the mixing tube.

5. The mixer assembly according to claim 4, 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.

6. The mixer assembly according to claim 4, wherein: the cyclone tube portion is inserted and installed in the perforated crushing tube and fixed by welding.

7. The mixer assembly according to claim 1, wherein: the extension pipe portion is inserted and installed in the mixing pipe and fixed by welding.

8. The mixer assembly according to claim 1, wherein: the mixer assembly includes a perforated breaker tube passing through the swirl tube, the perforated breaker tube including a first perforated tube section located within the swirl tube, a second perforated tube section located within the mixer tube, and a conical section connecting the first perforated tube section and the second perforated tube section.

9. The mixer assembly according to claim 8, wherein: the diameter of the second porous tube segment is greater than the diameter of the first porous tube segment.

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.

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