Mixer assembly

Abstract

A mixer assembly includes a housing, a mixing tube located in the housing, and a mixing element located in the mixing tube. The shell comprises an airflow cavity and a mounting hole used for mounting a urea nozzle. The mixing pipe comprises a first inner cavity, a plurality of spinning disks and a plurality of first airflow channels. And air flow flowing into the air flow cavity can penetrate through the first air flow channels under the guidance of the swirling pieces so as to flow into the first inner cavity in a swirling manner. And the urea nozzle is used for spraying a conical urea spray beam into the first inner cavity. The mixing element comprises a conical wall, a second inner cavity and a plurality of second airflow channels penetrating through the conical wall. The urea spraying beam and the rotational flow air flow in the first pipe body are mixed and then penetrate through the second air flow channels to flow into the second inner cavity. The mixer assembly improves mixing of tail gas and urea.

Description

Technical Field

[0001] The utility model relates to a mixer component and belongs to the technical field of engine exhaust post-processing. Background Art

[0002] The mixer assembly in the related art includes a mixing tube and a urea crushing tube located in the mixing tube.

[0003] When the urea spray jet from the urea nozzle is roughly cone-shaped, and the amount of urea on the outside is much greater than that on the inside, the urea crushing tube in the related art needs to be designed to be matched to further promote the mixing of the exhaust gas and the urea droplets. Utility Model Content

[0004] The purpose of the utility model is to provide a mixer component with better mixing effect.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a mixer assembly, comprising a shell, a mixing tube located in the shell, and a mixing element located in the mixing tube; the shell comprises an airflow cavity and a mounting hole for mounting a urea nozzle; the mixing tube comprises a first inner cavity, a plurality of swirl sheets exposed in the airflow cavity, and a plurality of first airflow channels corresponding to the plurality of swirl sheets, the plurality of first airflow channels connecting the airflow cavity and the first inner cavity; the airflow flowing into the airflow cavity can pass through the plurality of first airflow channels under the guidance of the plurality of swirl sheets to flow into the first inner cavity in a swirl shape; the urea nozzle is used to spray a conical urea spray into the first inner cavity; the mixing element comprises a conical wall, a second inner cavity, and a plurality of second airflow channels penetrating the conical wall, the plurality of second airflow channels connecting the first inner cavity and the second inner cavity; the urea spray and the swirl-shaped airflow in the first tube are mixed and then pass through the plurality of second airflow channels to flow into the second inner cavity.

[0006] As a further improved technical solution of the utility model, the mixing element includes a head facing the mounting hole, the conical wall includes a first edge away from the head, and the first edge is fixed to the inner wall of the mixing tube.

[0007] As a further improved technical solution of the utility model, the conical wall includes a second edge opposite to the first edge, the head is fixed to the conical wall and covers the second edge, and the head is provided with an arc-shaped surface protruding toward the mounting hole; the first edge is welded and fixed to the inner wall of the mixing tube.

[0008] As a further improved technical solution of the utility model, the mixing tube includes a first tube body and a second tube body, the first tube body and the second tube body are two separate parts, and the first tube body and the second tube body are fixed together;

[0009] The first edge of the tapered wall is welded and fixed to the inner wall of the second tube body; the second edge of the tapered wall and the head are located in the first tube body.

[0010] As a further improved technical solution of the utility model, the head is located in the first inner cavity along the axial direction, and the head and the plurality of swirl sheets at least partially overlap in the axial direction.

[0011] As a further improved technical solution of the utility model, the conical wall and the plurality of swirl sheets partially overlap in the axial direction.

[0012] As a further improved technical solution of the utility model, the plurality of first airflow channels and the plurality of second airflow channels are all narrow slots.

[0013] As a further improved technical solution of the present invention, the plurality of second air flow channels include a plurality of first narrow slots and a plurality of second narrow slots located below the plurality of first narrow slots.

[0014] As a further improved technical solution of the utility model, the housing includes an airflow inlet, a first cavity connected to the airflow inlet, an airflow outlet, and a second cavity connected to the airflow outlet; the airflow cavity includes the first cavity;

[0015] The plurality of swirl plates are located in the first cavity, the mixing tube extends into the second cavity, and the mixing tube includes an air flow port located in the second cavity.

[0016] As a further improved technical solution of the present invention, the mixer assembly further includes a reflection plate located in the second cavity, the reflection plate is substantially ω-shaped and is located at the airflow port.

[0017] Compared with the prior art, the mixing element of the utility model includes a conical wall, a second inner cavity and a plurality of second air flow channels penetrating the conical wall, wherein the conical wall matches the conical urea spray beam; after mixing, the urea spray beam and the swirling airflow in the first tube body pass through the plurality of second air flow channels to flow into the second inner cavity, thereby improving the mixing of the exhaust gas and urea. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the mixer assembly of the utility model in one embodiment.

[0019] Figure 2 is along Figure 1 Schematic diagram of the cross section along line AA.

[0020] Figure 3 yes Figure 2 A partial enlarged view of the middle frame portion B, with the urea nozzle and spray jet schematically indicated.

[0021] Figure 4 is along Figure 1 Schematic diagram of the cross section along the CC line.

[0022] Figure 5 Yes Figure 1 Front view after the middle shell.

[0023] Figure 6 is along Figure 5 Schematic diagram of the cross section of the DD line.

[0024] Figure 7 is along Figure 5 Schematic diagram of the cross section along line EE. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description involves the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as recorded in the claims of the present invention.

[0026] The terms used in the present invention are only for the purpose of describing specific implementations and are not intended to limit the scope of protection of the present invention. It should be understood that the terms such as "first", "second" and similar terms used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish the names of features.

[0027] Please refer to Figures 1 to 7 As shown, the utility model discloses a mixer assembly, which comprises a housing 1 , a mixing tube 2 located in the housing 1 , and a mixing element 3 located in the mixing tube 2 .

[0028] The housing 1 includes an airflow cavity 11 and a mounting hole 12 for mounting the urea nozzle 4. In the illustrated embodiment of the present utility model, the housing 11 includes an airflow inlet 111, a first cavity 112 connected to the airflow inlet 111, an airflow outlet 113, and a second cavity 114 connected to the airflow outlet 113. The airflow cavity 11 includes the first cavity 112. In the illustrated embodiment of the present utility model, the housing 11 includes a partition (not shown) to separate the first cavity 112 from the second cavity 114.

[0029] The mixing tube 2 includes a first inner cavity 21, a plurality of swirl sheets 22 exposed in the airflow cavity 11, and a plurality of first airflow channels 23 corresponding to the plurality of swirl sheets 22. The plurality of first airflow channels 23 connect the airflow cavity 11 and the first inner cavity 21. The airflow flowing into the airflow cavity 11 can pass through the plurality of first airflow channels 23 under the guidance of the plurality of swirl sheets 22 to flow into the first inner cavity 21 in a swirl shape.

[0030] The urea nozzle 4 is used to spray a conical urea spray beam into the first inner cavity 21. In the embodiment shown in the figure of the utility model, the amount of urea on the outer side of the conical urea spray beam is much greater than that on the inner side. Preferably, the conical urea spray beam is hollow, that is, only the outer side has urea droplets.

[0031] In the illustrated embodiment of the utility model, the mixing tube 2 includes a first tube body 2a and a second tube body 2b. The first tube body 2a and the second tube body 2b are two separate parts, and the first tube body 2a and the second tube body 2b are fixed together. Preferably, the first tube body 2a and the second tube body 2b are welded and fixed together. The first tube body 2a is partially inserted into the second tube body 2b for easy installation.

[0032] The plurality of swirl blades 22 are located in the first cavity 112 , the mixing tube 2 extends into the second cavity 114 , and the mixing tube 2 includes an air flow port 20 located in the second cavity 114 .

[0033] In the illustrated embodiment of the utility model, the mixing element 3 is roughly in the shape of a badminton. The mixing element 3 includes a conical wall 31, a head 32, a second inner cavity 33, and a plurality of second air flow channels 34 that penetrate the conical wall 31. The head 32 is directly opposite to the mounting hole 12, and the conical wall 31 includes a first edge 311 away from the head 32 and a second edge 312 opposite to the first edge 311. The head 32 is fixed to the conical wall 31 and covers the second edge 312, and the head 32 is provided with an arc surface 321 that protrudes toward the mounting hole 12. The first edge 311 is fixed to the inner wall of the mixing tube 2. In the illustrated embodiment of the utility model, the first edge 311 is welded and fixed to the inner wall of the mixing tube 2 to force most of the mixed airflow to flow into the second inner cavity 33 only from the plurality of second air flow channels 34. The first edge 311 of the conical wall 31 is welded and fixed to the inner wall of the second tube body 2b; the second edge 312 of the conical wall 31 and the head 32 are located in the first tube body 2a. The head 32 is located in the first inner cavity 21 along the axial direction, and the head 32 and the plurality of swirl sheets 22 at least partially overlap in the axial direction; the conical wall 31 and the plurality of swirl sheets 22 partially overlap in the axial direction to improve the compactness of the structure.

[0034] The plurality of second air flow channels 34 connect the first inner cavity 21 and the second inner cavity 33 ; the urea spray and the swirl-shaped airflow in the first tube 2 a are mixed and then pass through the plurality of second air flow channels 34 to flow into the second inner cavity 33 .

[0035] In the illustrated embodiment of the present utility model, the plurality of first airflow channels 23 and the plurality of second airflow channels 34 are all slots. The plurality of second airflow channels 34 include a plurality of first slots 341 and a plurality of second slots 342 located below the plurality of first slots 341. In the illustrated embodiment of the present utility model, the length of each of the first slots 341 is greater than the length of each of the second slots 342 to better distribute the airflow. Of course, those skilled in the art will understand that the number, shape, length relationship, etc. of the first airflow channels 23 and the second airflow channels 34 can be flexibly adjusted according to the area of ​​the conical wall 31, and do not constitute a limitation to the present utility model.

[0036] In addition, the mixer assembly further includes a reflector plate 25 located in the second cavity 114 and an airflow distribution plate 26 near the airflow outlet 113. The reflector plate 25 is substantially ω-shaped and is located at the airflow port 20. The reflector plate 25 is used to enable the airflow to swirl better on both sides, increase the mixing distance, and thus better promote the mixing of the exhaust gas and urea.

[0037] When in use, the exhaust gas discharged from the engine flows into the first cavity 112 from the air flow inlet 111; the exhaust gas passes through the first air flow channels 23 under the guidance of the plurality of swirl plates 22 to flow into the first inner cavity 21 of the first tube 2a in a swirl shape; when the injection condition is met, the urea nozzle 4 sprays a conical urea spray beam into the first inner cavity 21 of the mixing tube 2; the swirl-shaped air flow wraps the urea droplets and mixes them in the space between the mixing tube 2 and the mixing element 3, and the mixed air flow then passes through the second air flow channels 34 to flow into the second tube 2b; then, the mixed air flow passes through the air flow port 20 and flows into the second cavity 114 under the action of the reflector 25; then, the air flow flows out evenly from the air flow outlet 113 under the action of the air flow distribution plate 26.

[0038] Compared with the prior art, the mixing element 3 of the present invention includes a conical wall 31, a second inner cavity 33 and a plurality of second air flow channels 34 penetrating the conical wall 31, and the conical wall 341 matches the conical urea spray beam; after mixing, the urea spray beam and the swirl-shaped airflow in the first tube body 2a pass through the plurality of second air flow channels 34 to flow into the second inner cavity 33, thereby improving the mixing of the exhaust gas and urea.

[0039] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A mixer assembly, characterized in that: The invention comprises a shell, a mixing tube located in the shell, and a mixing element located in the mixing tube; the shell comprises an airflow cavity and a mounting hole for mounting a urea nozzle; the mixing tube comprises a first inner cavity, a plurality of swirl sheets exposed in the airflow cavity, and a plurality of first airflow channels corresponding to the plurality of swirl sheets, the plurality of first airflow channels communicating the airflow cavity and the first inner cavity; the airflow flowing into the airflow cavity can pass through the plurality of first airflow channels under the guidance of the plurality of swirl sheets to flow into the first inner cavity in a swirl shape; the urea nozzle is used to spray a conical urea spray into the first inner cavity; the mixing element comprises a conical wall, a second inner cavity, and a plurality of second airflow channels penetrating the conical wall, the plurality of second airflow channels communicating the first inner cavity and the second inner cavity; the urea spray passes through the plurality of second airflow channels after mixing with the swirl-shaped airflow in the mixing tube to flow into the second inner cavity.

2. The mixer assembly according to claim 1, characterized in that: The mixing element comprises a head facing the mounting hole, the tapered wall comprises a first edge away from the head, and the first edge is fixed to the inner wall of the mixing tube.

3. The mixer assembly according to claim 2, characterized in that: The conical wall includes a second edge opposite to the first edge, the head is fixed to the conical wall and covers the second edge, and the head is provided with an arc surface protruding toward the mounting hole; the first edge is welded and fixed to the inner wall of the mixing tube.

4. The mixer assembly according to claim 3, characterized in that: The mixing tube comprises a first tube body and a second tube body, wherein the first tube body and the second tube body are two separate parts, and the first tube body and the second tube body are fixed together; The first edge of the tapered wall is welded and fixed to the inner wall of the second tube body; the second edge of the tapered wall and the head are located in the first tube body.

5. The mixer assembly according to claim 3, characterized in that: The head is axially located in the first inner cavity, and the head at least partially overlaps with the plurality of swirl plates in the axial direction.

6. The mixer assembly according to claim 5, characterized in that: The conical wall and the plurality of swirl plates partially overlap in the axial direction.

7. The mixer assembly according to claim 1, characterized in that: The plurality of first airflow channels and the plurality of second airflow channels are all slots.

8. The mixer assembly according to claim 7, characterized in that: The plurality of second air flow channels include a plurality of first slots and a plurality of second slots located below the plurality of first slots.

9. The mixer assembly of claim 1, wherein: The housing comprises an airflow inlet, a first cavity connected to the airflow inlet, an airflow outlet, and a second cavity connected to the airflow outlet; the airflow cavity comprises the first cavity; The plurality of swirl plates are located in the first cavity, the mixing tube extends into the second cavity, and the mixing tube includes an air flow port located in the second cavity.

10. The mixer assembly of claim 9, wherein: The mixer assembly further includes a reflection plate located in the second cavity, wherein the reflection plate is substantially ω-shaped and located at the air flow port.

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