Engine exhaust aftertreatment device

Abstract

An engine exhaust aftertreatment device comprises a shell, a plurality of aftertreatment components and a cavity component. The cavity component comprises a first cavity component, a swirl tube component and a second cavity component. The swirl tube component comprises a connecting pipe and a swirl tube partially installed in the connecting pipe. The connecting pipe is provided with an expansion portion, and the swirl tube comprises a fin area for forming an exhaust swirl and a trumpet portion located at one end of the fin area. The trumpet portion is provided with a gap connected to the first cavity component. With such an arrangement, the swirl tube can improve the uniform mixing of the exhaust gas and the urea solution. In addition, the gap can allow part of the exhaust gas to pass through the gap and directly enter the connecting pipe, so that the exhaust gas flow rate can be distributed and the system back pressure can be correspondingly adjusted.

Description

Technical Field

[0001] The invention relates to an engine exhaust aftertreatment device. Background Art

[0002] Engine exhaust aftertreatment devices (such as diesel exhaust aftertreatment devices) are mainly used to treat or evolve toxic and harmful substances in exhaust. Toxic substances in exhaust mainly include hydrocarbons, carbon monoxide, nitrogen oxides and particulate matter.

[0003] In the prior art, there is a scheme that uses a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF) and a selective catalytic reducer (SCR) in combination to improve the efficiency of exhaust gas treatment. In one scheme, the oxidation catalytic converter and the particulate filter are arranged in series in a first housing, and a first cavity connected to the first housing is also arranged; the selective catalytic reducer is arranged in a second housing, and a second cavity connected to the second housing is also arranged; then the first and second cavities are connected in series by means of a connecting pipe. The exhaust gas and urea droplets are mixed in the connecting pipe, and the mixture then enters the second cavity and passes through the selective catalytic reducer to reduce harmful substances. However, after entering the second cavity, the mixture of exhaust gas and urea droplets is unevenly distributed, and thus the mixture cannot pass through the selective catalytic reducer evenly, which reduces the treatment efficiency. Summary of the invention

[0004] The object of the present invention is to provide an engine exhaust aftertreatment device with easily adjustable back pressure and capable of achieving relatively uniform mixing of exhaust gas and urea solution.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an engine exhaust after-treatment device, which includes a shell, a plurality of after-treatment components located in the shell, and a cavity component connecting the after-treatment components, wherein the plurality of after-treatment components include a first after-treatment component, a second after-treatment component aligned with and connected to the first after-treatment component, and a third after-treatment component arranged side by side with the first and second after-treatment components; the cavity component includes a first cavity component connected to the second after-treatment component, a vortex tube component connected to the first cavity component, and a vortex tube component for connecting the vortex tube component to the first cavity component. A flow tube assembly is connected to a second cavity assembly connected to the third after-treatment assembly; the vortex tube assembly includes a connecting tube connecting the first cavity assembly and the second cavity assembly and a vortex tube partially installed in the connecting tube, the connecting tube is provided with an expansion portion, the vortex tube includes a fin area for forming an exhaust vortex and a trumpet portion located at one end of the fin area, the fin area is at least partially located in the first cavity assembly and at least partially located in the expansion portion, the trumpet portion is fixed on the inner side of the connecting tube, and the trumpet portion is provided with a gap connected to the first cavity assembly.

[0006] As a further improved technical solution of the present invention, the connecting pipe is provided with a first part with a smaller diameter, the expanding part includes a second part with a larger diameter and a conical part connecting the first part and the second part; the horn part is provided with a plurality of fixing parts fixed on the inner side of the first part, and the gap is located between two adjacent fixing parts.

[0007] As a further improved technical solution of the present invention, the fin area is located in the first cavity assembly and the expansion portion in a suspended state.

[0008] As a further improved technical solution of the present invention, the fin area includes a first fin area that is at least partially located in the first cavity assembly and a second fin area that is at least located in the expansion portion, and the first fin area is adjacent to the second fin area, wherein the first fin area is provided with a plurality of first fins distributed along the circumferential direction, and the second fin area is provided with a plurality of second fins distributed along the circumferential direction, and the first fin and the second fin are separately arranged.

[0009] As a further improved technical solution of the present invention, the first fins and the second fins are correspondingly arranged in alignment along the axial direction of the vortex tube.

[0010] As a further improved technical solution of the present invention, the engine exhaust aftertreatment device further includes a nozzle seat installed at one end of the swirl tube, and the nozzle seat is used to install a urea nozzle to spray urea droplets into the swirl tube.

[0011] As a further improved technical solution of the present invention, the horn portion and the vortex tube are manufactured separately but assembled together.

[0012] As a further improved technical solution of the present invention, the shell includes a first end cover, a first baffle, a second baffle, a second end cover and an outer shell wrapped around the first and second baffles and fixed to the first and second end covers; a first space is formed between the first end cover and the first baffle, and the shell includes an exhaust inlet pipe passing through the first end cover and entering the first space; the first after-treatment component is at least partially located between the first and second baffles; the exhaust inlet pipe is provided with a plurality of exhaust holes connected to the first space on its peripheral wall; the first baffle is provided with a first opening connecting the first after-treatment component with the first space; a second space is formed between the second end cover and the second baffle, and the second baffle is provided with a second opening connecting the second after-treatment component with the second space and a third opening connected to the corresponding third after-treatment component; the first cavity component is buckled on the second opening.

[0013] As a further improved technical solution of the present invention, the exhaust inlet pipe abuts against and is fixed on the first baffle, and the shell further includes an exhaust outlet pipe communicated with the second space.

[0014] As a further improved technical solution of the present invention, the first after-treatment component includes a diesel oxidation catalyst and a first porous distribution plate located upstream of the diesel oxidation catalyst; the second after-treatment component includes a diesel particulate filter; and the third after-treatment component includes a selective catalytic reducer.

[0015] Compared with the prior art, the present invention improves the uniform mixing of exhaust gas and urea solution by providing a swirl tube. In addition, by providing a gap connected to the first cavity assembly, part of the exhaust gas can pass through the gap and directly enter the connecting pipe. By adjusting the cross-sectional area of ​​the gap, the distribution of the exhaust gas flow and the corresponding adjustment of the system back pressure can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the engine exhaust after-treatment device of the present invention.

[0017] Figure 2 yes Figure 1 A three-dimensional diagram from another angle.

[0018] Figure 3 yes Figure 1 main view.

[0019] Figure 4 yes Figure 1 Right view of .

[0020] Figure 5 yes Figure 1 Left view of .

[0021] Figure 6 is along Figure 4 Schematic diagram of the cross section along line AA.

[0022] Figure 7 is along Figure 4 Schematic diagram of the cross section along line BB.

[0023] Figure 8 is along Figure 3 Schematic diagram of the cross section along the CC line.

[0024] Fig. 9 is along Figure 3 Schematic diagram of the cross section of the DD line.

[0025] Fig.10 is along Figure 1 Schematic diagram of the decomposition.

[0026] Fig.11 yes Fig.10 Schematic diagram of the decomposition from another angle.

[0027] Fig.12 It is a three-dimensional schematic diagram of the connection tube and the swirl tube of the present invention when they are matched.

[0028] Fig.13 yes Fig.12 Schematic diagram of the connecting pipe.

[0029] Fig.14 It is a three-dimensional exploded schematic diagram of the swirl tube and the nozzle seat. DETAILED DESCRIPTION

[0030] Please refer to Figures 1 to 14 As shown, the present invention discloses an engine exhaust after-treatment device 100, which includes a housing 1, a plurality of after-treatment components located in the housing 1, and a cavity component connecting the after-treatment components.

[0031] In the illustrated embodiment of the present invention, the shell 1 includes a first end cover 10, a first baffle 11, a second baffle 12, a second end cover 13 and an outer shell 14 wrapped around the first and second baffles 11 and 12 and fixed to the first and second end covers 10 and 13.

[0032] Please refer to Figures 6 to 8As shown, a first space 15 is formed between the first end cover 10 and the first baffle 11, and a second space 16 is formed between the second end cover 13 and the second baffle 12. The housing 1 includes an exhaust inlet pipe 17 that passes through the first end cover 10 and enters the first space 15, and an exhaust outlet pipe 18 that is connected to the second space 16. The exhaust inlet pipe 17 is provided with a plurality of exhaust holes 171 that are connected to the first space 15 on its peripheral wall to facilitate the distribution of airflow. In the illustrated embodiment of the present invention, the exhaust inlet pipe 17 abuts against and is fixed on the first baffle 11 to play a reinforcing role.

[0033] The plurality of after-treatment components include a first after-treatment component 21 at least partially located between the first and second baffles 11, 12, a second after-treatment component 22 aligned with the first after-treatment component 21 and interconnected, and two third after-treatment components 23 arranged side by side with the first and second after-treatment components 21, 22. In the illustrated embodiment of the present invention, the first after-treatment component 21 includes a diesel oxidation catalyst (DOC) and a first porous distribution plate 211 located upstream of the diesel oxidation catalyst. The second after-treatment component 22 includes a diesel particulate filter (DPF). The third after-treatment component 23 includes a selective catalytic reducer (SCR).

[0034] The first baffle 11 has a first opening 111 connecting the first post-processing assembly 21 with the first space 15 . The second baffle 12 has a second opening 121 connecting the second post-processing assembly 22 with the second space 16 and a third opening 122 connecting the corresponding third post-processing assembly 23 .

[0035] The cavity assembly includes a first cavity assembly 31 fastened on the second opening 121 , a cyclone assembly 33 connected to the first cavity assembly 31 , and a second cavity assembly 32 for connecting the cyclone assembly 33 with the third post-processing assembly 23 .

[0036] The swirl tube assembly 33 includes a connecting tube 34 connecting the first cavity assembly 31 and the second cavity assembly 32 and a swirl tube 35 partially installed in the connecting tube 34, the connecting tube 34 is provided with an enlarged portion 341, and the swirl tube 35 includes a fin area 39 for forming an exhaust swirl. The fin area 39 is at least partially located in the first cavity assembly 31 and at least partially located in the enlarged portion 341 in a suspended state. In the illustrated embodiment of the present invention, the fin area 39 includes a first fin area 36 at least partially located in the first cavity assembly 31 and a second fin area 37 at least located in the enlarged portion 341, the first fin area 36 and the second fin area 37 are arranged adjacent to each other, wherein the first fin area 36 is provided with a plurality of first fins 361 distributed along the circumferential direction, the second fin area 37 is provided with a plurality of second fins 371 distributed along the circumferential direction, and the first fin 361 and the second fin 371 are arranged separately.

[0037] Please refer to Figure 6 As shown, in the illustrated embodiment of the present invention, the first fin region 36 is completely located in the first cavity assembly 31 , and the second fin region 37 is completely located in the expanded portion 341 .

[0038] In the illustrated embodiment of the present invention, the corresponding first fins 361 and the second fins 371 are arranged in alignment along the axial direction of the vortex tube 35 to facilitate processing and manufacturing.

[0039] Of course, in other embodiments, the fin area 39 may also be provided with only one set of fins, which is equivalent to connecting the first fin 361 with the second fin 371. However, the segmented fins disclosed in the illustrated embodiment of the present invention have greater structural strength and better durability than the integral fins.

[0040] Please refer to Figure 2 and Fig.14 As shown, the engine exhaust aftertreatment device 100 further includes a nozzle seat 38 mounted at one end of the swirl tube 35 , and the nozzle seat 38 is used to mount a urea nozzle (not shown) to spray urea droplets into the swirl tube 35 .

[0041] The connecting tube 34 is provided with a first portion 342 with a smaller diameter, and the enlarged portion 341 includes a second portion 3411 with a larger diameter and a tapered portion 3412 connecting the first portion 342 and the second portion 3411; the swirl tube 35 includes a trumpet portion 351 located at one end of the fin region 39, the trumpet portion 351 is fixed to the inner side of the connecting tube 34, and the trumpet portion 351 is provided with a gap 3512 communicating with the first cavity assembly 31. In the illustrated embodiment of the present invention, the trumpet portion 351 is provided with a plurality of fixing portions 3511 fixed to the inner side of the first portion 342, and the gap 3512 is located between two adjacent fixing portions 3511.

[0042] Please refer to Fig. 9 As shown by the arrows in FIG. 3 , a portion of the exhaust gas can pass through the fin area 39 and enter the swirl tube 35 in a swirl manner; a portion of the exhaust gas can directly enter the connecting pipe 34 through the gap 3512. By adjusting the cross-sectional area of ​​the gap 3512, the distribution of the exhaust gas flow and the corresponding adjustment of the system back pressure can be achieved. At the same time, the exhaust gas passing through the gap 3512 is bound to heat the periphery of the swirl tube 35, which is conducive to the thermal decomposition of the urea droplets.

[0043] In the illustrated embodiment of the present invention, the horn 351 and the vortex tube 35 are made separately but assembled together. Such arrangement is convenient for processing and manufacturing. Of course, in other embodiments, the horn 351 and the vortex tube 35 can also be a single part.

[0044] In addition, the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technical personnel in the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements 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. An engine exhaust aftertreatment device, comprising a housing, a plurality of aftertreatment components located in the housing, and a cavity component connecting the aftertreatment components, wherein the plurality of aftertreatment components include a first aftertreatment component, a second aftertreatment component aligned with and connected to the first aftertreatment component, and a third aftertreatment component arranged side by side with the first and second aftertreatment components; the cavity component includes a first cavity component connected to the second aftertreatment component, a vortex tube component connected to the first cavity component, and a second cavity component used to connect the vortex tube component to the third aftertreatment component; characterized in that: The swirl tube assembly includes a connecting tube connecting the first cavity assembly and the second cavity assembly and a swirl tube partially installed in the connecting tube, the connecting tube is provided with an expansion portion, the swirl tube includes a fin area for forming an exhaust swirl and a trumpet portion located at one end of the fin area, the fin area is at least partially located in the first cavity assembly and at least partially located in the expansion portion, the trumpet portion is fixed on the inner side of the connecting tube, and the trumpet portion is provided with a gap connected to the first cavity assembly.

2. The engine exhaust aftertreatment device according to claim 1, characterized in that: The connecting pipe is provided with a first part with a smaller diameter, and the expanding part includes a second part with a larger diameter and a conical part connecting the first part and the second part; the horn part is provided with a plurality of fixing parts fixed on the inner side of the first part, and the gap is located between two adjacent fixing parts.

3. The engine exhaust aftertreatment device according to claim 1, characterized in that: The fin area is located in the first cavity component and the expansion portion in a suspended state.

4. The engine exhaust aftertreatment device according to claim 3, characterized in that: The fin area includes a first fin area at least partially located in the first cavity assembly and a second fin area at least located in the expansion portion, the first fin area is arranged adjacent to the second fin area, wherein the first fin area is provided with a plurality of first fins distributed along the circumferential direction, the second fin area is provided with a plurality of second fins distributed along the circumferential direction, and the first fins are separately arranged from the second fins.

5. The engine exhaust aftertreatment device according to claim 4, characterized in that: The corresponding first fins and the second fins are arranged in alignment along the axial direction of the vortex tube.

6. The engine exhaust aftertreatment device according to claim 1, characterized in that: The engine exhaust aftertreatment device further comprises a nozzle seat mounted at one end of the swirl tube, wherein the nozzle seat is used to mount a urea nozzle to spray urea droplets into the swirl tube.

7. The engine exhaust aftertreatment device according to claim 1, characterized in that: The horn portion and the cyclone tube are manufactured separately but assembled together.

8. The engine exhaust aftertreatment device according to claim 1, characterized in that: The shell includes a first end cover, a first baffle, a second baffle, a second end cover and an outer shell wrapped around the first and second baffles and fixed to the first and second end covers; a first space is formed between the first end cover and the first baffle, and the shell includes an exhaust inlet pipe passing through the first end cover and entering the first space; the first after-treatment component is at least partially located between the first and second baffles; the exhaust inlet pipe is provided with a plurality of exhaust holes connected to the first space on its peripheral wall; the first baffle is provided with a first opening connecting the first after-treatment component with the first space; a second space is formed between the second end cover and the second baffle, and the second baffle is provided with a second opening connecting the second after-treatment component with the second space and a third opening connected to the corresponding third after-treatment component; the first cavity component is buckled on the second opening.

9. The engine exhaust aftertreatment device according to claim 8, characterized in that: The exhaust inlet pipe abuts against and is fixed on the first baffle, and the shell further includes an exhaust outlet pipe communicated with the second space.

10. The engine exhaust aftertreatment device according to claim 8, characterized in that: The first aftertreatment component includes a diesel oxidation catalyst and a first porous distribution plate located upstream of the diesel oxidation catalyst; the second aftertreatment component includes a diesel particulate filter; and the third aftertreatment component includes a selective catalytic reducer.

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