Exhaust after-treatment packaging

Abstract

An exhaust gas aftertreatment package includes an outer shell, a first baffle and a second baffle arranged at intervals within the outer shell, a third aftertreatment carrier assembly, and a mixing pipe assembly. The third aftertreatment carrier assembly includes a third housing and a third catalyst carrier encapsulated within the third housing. The third housing has several protrusions fixed to the second baffle and an airflow channel located between adjacent protrusions. The airflow channel penetrates the second baffle and communicates with the third aftertreatment carrier assembly. Compared to the prior art, this invention, by providing several protrusions on the third housing, facilitates the fixing of the third housing to the second baffle; furthermore, by designing the airflow channel and ensuring it penetrates the second baffle to communicate with the third aftertreatment carrier assembly, additional flow guiding elements are omitted, reducing the cost of the exhaust gas aftertreatment package.

Description

Technical Field

[0001] This invention relates to an exhaust aftertreatment package, belonging to the field of engine exhaust aftertreatment technology. Background Technology

[0002] With increasingly stringent emission regulations, existing exhaust aftertreatment packages typically include a diesel oxidation catalyst, a diesel particulate filter, a selective catalytic reduction (SCR) agent, and a mixing tube assembly installed between the diesel particulate filter and the SCR agent. As the gas stream exits the mixing assembly, a flow guide structure is usually required before it enters the SCR agent. This design increases the number of parts and raises the coaxiality requirements for the SCR assembly when mounted onto the baffle, leading to increased costs. Summary of the Invention

[0003] The purpose of this invention is to provide a low-cost exhaust gas aftertreatment package.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an exhaust gas aftertreatment package, comprising an outer shell, a first baffle and a second baffle arranged at intervals within the outer shell, a second aftertreatment carrier assembly within the outer shell, a third aftertreatment carrier assembly downstream of the second aftertreatment carrier assembly, and a mixing pipe assembly connecting the second aftertreatment carrier assembly and the third aftertreatment carrier assembly; the first baffle has a first side facing the second baffle and a second side opposite to the first side, the second baffle has a third side facing the first baffle and a fourth side opposite to the third side; the third aftertreatment carrier assembly includes a third housing and a third catalyst carrier encapsulated within the third housing, the exhaust gas aftertreatment package includes a first connecting cavity located on the fourth side of the second baffle and a second connecting cavity located between the first baffle and the second baffle, the third housing has a plurality of protrusions fixed to the second baffle and an airflow channel located between two adjacent protrusions, the airflow channel penetrating the second baffle, the first connecting cavity communicating with the second aftertreatment carrier assembly, and the second connecting cavity communicating with the third aftertreatment carrier assembly through the airflow channel.

[0005] As a further improved technical solution of the present invention, the first baffle is provided with a positioning opening for positioning the third housing, the second baffle is provided with an opening, the plurality of protrusions are welded and fixed to the third side, and the airflow channel is connected to the opening.

[0006] As a further improved technical solution of the present invention, the first baffle is provided with a second protrusion formed by stamping and protruding from the fourth side, the second protrusion forms the opening, and the second protrusion is provided with a third connecting cavity that communicates with the inlet of the third post-processing carrier assembly.

[0007] As a further improvement of the present invention, the mixing tube assembly includes an end extending into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, and there is a gap between the end and the first baffle.

[0008] As a further improvement of the present invention, the mixing tube assembly includes a mixing tube and an expansion tube sleeved on the mixing tube. The mixing tube is provided with a plurality of swirling vanes communicating with the first connecting cavity. The second baffle is provided with an opening, and the swirling vanes are suspended in the opening. The mixing tube passes through the opening. The swirling vanes protrude from the fourth side of the second baffle to extend into the first connecting cavity, and the swirling vanes protrude from the third side of the second baffle to extend into the expansion tube. The expansion tube is fixed to the third side of the second baffle and sealed around the opening.

[0009] As a further improvement of the present invention, the expansion cylinder is provided with an expansion cavity and an end wall, the expansion cavity being connected to the opening; the end wall is provided with a through hole for the mixing tube to pass through, and the mixing tube is fixed on the end wall, with the end located on the mixing tube.

[0010] As a further improvement of the present invention, the first baffle is provided with an arc-shaped recess corresponding to the end, the arc-shaped recess being recessed from the first side to the second side.

[0011] As a further improved technical solution of the present invention, the exhaust gas aftertreatment package includes a mounting cover installed on the mixing pipe and a urea nozzle mounting seat fixed on the mounting cover, wherein the mounting cover and the end are respectively located at both ends of the mixing pipe; the mounting cover has a first raised portion and a plurality of positioning grooves located around the periphery of the first raised portion, and the first raised portion has a mounting hole; the urea nozzle mounting seat has a plurality of positioning feet that are engaged in the plurality of positioning grooves and a second raised portion that protrudes toward the first raised portion, the second raised portion is inserted into the mounting hole and welded to the mounting cover, and the second raised portion has a nozzle hole for mounting the urea nozzle.

[0012] As a further improvement of the present invention, the exhaust gas aftertreatment package includes a first convex bulge fixed to the fourth side of the second baffle, and the first connecting cavity is formed in the first convex bulge.

[0013] As a further improved technical solution of the present invention, the second aftertreatment carrier assembly includes a second housing and a diesel particulate filter encapsulated in the second housing; the exhaust gas aftertreatment encapsulation includes a cylindrical portion sleeved around the periphery of the second housing, and the second aftertreatment carrier assembly is detachably installed in the cylindrical portion.

[0014] Compared to existing technologies, the present invention facilitates the fixing of the third housing to the second baffle by providing several protrusions on the third housing for fixing to the second baffle; in addition, by providing an airflow channel between two adjacent protrusions and allowing the airflow channel to pass through the second baffle to connect with the third after-treatment carrier assembly, additional flow guiding elements are omitted, reducing the cost of exhaust gas after-treatment packaging. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the exhaust gas aftertreatment package of the present invention in the first embodiment.

[0016] Figure 2 yes Figure 1 The main view.

[0017] Figure 3 yes Figure 1 Partial exploded 3D diagram.

[0018] Figure 4 yes Figure 3 Further exploded 3D diagram.

[0019] Figure 5 It is to remove Figure 1 A three-dimensional schematic diagram of the inner and outer shell.

[0020] Figure 6 yes Figure 5 A three-dimensional diagram from another angle.

[0021] Figure 7 yes Figure 6 Top view.

[0022] Figure 8 yes Figure 5 Partial exploded 3D diagram.

[0023] Figure 9 yes Figure 6 Partial exploded 3D diagram.

[0024] Figure 10 yes Figure 9 Further exploded 3D diagram.

[0025] Figure 11 This is a three-dimensional schematic diagram of the end cap assembly.

[0026] Figure 12 yes Figure 11 A three-dimensional diagram from another angle.

[0027] Figure 13 yes Figure 11 3D exploded view.

[0028] Figure 14 It is along Figure 2 A cross-sectional schematic diagram of the DD line.

[0029] Figure 15 yes Figure 14 A magnified view of part E circled in the middle.

[0030] Figure 16 It is along Figure 2 A cross-sectional view of the FF line.

[0031] Figure 17 It is along Figure 2 A cross-sectional schematic diagram of the GG line.

[0032] Figure 18 It is along Figure 2 A schematic diagram of the cross section of the HH line. Detailed Implementation

[0033] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments may be combined with each other without conflict. When the description relates to the accompanying drawings, unless otherwise stated, the same numbers or symbols in different drawings denote the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments of the present invention; rather, they are merely examples of products consistent with the present invention as set forth in the claims.

[0034] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. It should be understood that terms such as "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features.

[0035] Please refer to Figures 1 to 18 As shown, the present invention discloses an exhaust gas aftertreatment package 100, which includes an outer shell 1, a first baffle 21 and a second baffle 22 located inside the outer shell 1 and arranged at intervals, an intake pipe 31 for allowing exhaust gas to enter, an exhaust pipe 32 for allowing exhaust gas to flow out, a first aftertreatment carrier assembly 51, a second aftertreatment carrier assembly 52, a third aftertreatment carrier assembly 53, a mixing pipe assembly 6, and a bracket assembly 7 mounted on the outer shell 1.

[0036] In one embodiment of the present invention, the first aftertreatment carrier assembly 51 includes a first housing 511 and a diesel oxidation catalyst (DOC) 512 encapsulated within the first housing 511; the second aftertreatment carrier assembly 52 includes a second housing 521 and a diesel particulate filter (DPF) 522 encapsulated within the second housing 521; the third aftertreatment carrier assembly 53 includes a third housing 531 and a third catalyst carrier 532 encapsulated within the third housing 531, wherein the third catalyst carrier 532 may be a selective catalytic reduction (SCR) agent. In the illustrated embodiment of the present invention, the third aftertreatment carrier assemblies 53 are two sets arranged side by side. In the illustrated embodiment of the present invention, the second aftertreatment carrier assembly 52 is located downstream of the first aftertreatment carrier assembly 51, and the third aftertreatment carrier assembly 53 is located downstream of the second aftertreatment carrier assembly 52. ​​The mixing pipe assembly 6 connects the second aftertreatment carrier assembly 52 and the third aftertreatment carrier assembly 53.

[0037] Please refer to Figure 5 and Figure 6 As shown, the first baffle 21 has a first side 211 facing the second baffle 22 and a second side 212 opposite to the first side 211. The second baffle 22 has a third side 221 facing the first baffle 21 and a fourth side 222 opposite to the third side 221.

[0038] In the embodiment illustrated in the present invention, the exhaust aftertreatment package 100 includes an intake protrusion 43 welded and fixed to the second side 212 of the first baffle 21, an exhaust protrusion 44 welded and fixed to the second side 212 of the first baffle 21, and a first protrusion 41 welded and fixed to the fourth side 222 of the second baffle 22. The intake protrusion 43 is provided with an intake cavity 431, wherein one end of the intake cavity 431 (e.g.) Figure 8 The upper end of the air intake chamber 431 is connected to the air intake pipe 31, and the other end of the air intake chamber 431 (e.g.) Figure 8 The lower end of the vent 44 is connected to the inlet of the first post-processing carrier assembly 51. The vent 44 is provided with a vent cavity 441 that is connected to the outlet of the third post-processing carrier assembly 53, and the vent pipe 32 is connected to the vent cavity 441.

[0039] The first convex bulge 41 is provided with a first connecting cavity 411. The exhaust gas aftertreatment package 100 includes a second connecting cavity 412 located between the first baffle 21 and the second baffle 22. The first connecting cavity 411 is connected to the second aftertreatment carrier assembly 52, and the second connecting cavity 412 is connected to the third aftertreatment carrier assembly 53.

[0040] In the embodiment illustrated in the present invention, the air intake pipe 31 is generally located within the second connecting cavity 412 and penetrates the first baffle 21. The first baffle 21 also includes a positioning opening 213 for positioning the third housing 531. Furthermore, please refer to... Figure 8 and Figure 16 As shown, the first baffle 21 is also provided with an arc-shaped recess 214 corresponding to the mixing tube assembly 6, the arc-shaped recess 214 being recessed from the first side surface 211 to the second side surface 212. The arc-shaped recess 214 is used to reverse the airflow to improve the uniformity of the airflow.

[0041] The second baffle 22 has an opening 223 that mates with the mixing tube assembly 6 and a second protrusion 42 formed by stamping and protruding from the fourth side surface 222. During the formation of the second protrusion 42, an opening 224 is also formed on the second baffle 22. The second protrusion 42 has a third connecting cavity 421 that communicates with the inlet of the third post-processing carrier assembly 53.

[0042] The mixing tube assembly 6 includes a mixing tube 61 and an expansion tube 62 sleeved on the mixing tube 61. The mixing tube 61 is provided with a plurality of swirl vanes 611 communicating with the first connecting cavity 411. Please refer to... Figure 9 and Figure 17 As shown, the swirl vane 611 is suspended in the opening 223. The mixing tube 61 passes through the opening 223. Specifically, the swirl vane 611 protrudes from the fourth side 222 of the second baffle 22 to extend into the first connecting cavity 411, and the swirl vane 611 protrudes from the third side 221 of the second baffle 22 to extend into the expansion tube 62. The expansion tube 62 is fixed to the third side 221 of the second baffle 22 and sealed around the opening 223. The expansion tube 62 has an expansion cavity 621 and an end wall 622. The expansion cavity 621 communicates with the opening 223; the end wall 622 has a through hole 6221 through which the mixing tube 61 passes, and the mixing tube 61 is fixed to the end wall 622. The mixing tube 61 includes an end 612 extending into the second connecting cavity 412, wherein there is a gap 613 between the end 612 and the first baffle 21. With this configuration, the mixing tube assembly 6 only needs to be welded at one end, avoiding the excessively high requirements for coaxiality when welding at both ends, improving the convenience of assembly and reducing costs. In other words, once the mixing tube assembly 6 is welded and fixed to the second baffle 22, even if the mixing tube 61 is tilted within the second connecting cavity 412, it will not cause serious problems.

[0043] Please refer to Figures 11 to 13As shown, the exhaust gas aftertreatment package 100 further includes a mounting cover 63 mounted on the mixing pipe 61 and a urea nozzle mounting seat 64 fixed on the mounting cover 63, wherein the mounting cover 63 and the end 612 are respectively located at both ends of the mixing pipe 61. The mounting cover 63 has a first raised portion 631 located at the center and a plurality of positioning grooves 632 located around the first raised portion 631. The first raised portion 631 has a mounting hole 6311. The urea nozzle mounting seat 64 has a plurality of positioning feet 642 that are engaged in the plurality of positioning grooves 632 and a second raised portion 641 protruding towards the first raised portion 631. During assembly, the second raised portion 641 is inserted into the mounting hole 6311 and welded to the mounting cover 63. The second raised portion 641 has a nozzle hole 6411 for mounting the urea nozzle. Furthermore, in the embodiment illustrated in this invention, the outer periphery of the urea nozzle mounting base 64 is optimized to have a welding clearance portion 643, thereby facilitating the insertion of a welding torch to weld and fix the mounting cover 63 to the mixing pipe 61.

[0044] Please refer to Figure 14 and Figure 15 As shown, the exhaust gas aftertreatment package 100 includes a cylindrical portion 23 penetrating the first baffle 21 and the second baffle 22. The cylindrical portion 23 is welded and fixed to the first baffle 21 and the second baffle 22. The first housing 511 and the second housing 521 are both housed within the cylindrical portion 23. The cylindrical portion 23 has a first protrusion 231 (e.g., a flared or flanged) protruding radially outward. The second housing 521 has a second protrusion 520 protruding radially outward. The exhaust gas aftertreatment package 100 also includes a sealing member 523 sandwiched between the first protrusion 231 and the second protrusion 520. In one embodiment of the present invention, the sealing member 523 is a sealing gasket fitted onto the second housing 521.

[0045] The exhaust gas aftertreatment package 100 also includes a connector 524 fixed to the second housing 521. Please refer to... Figure 4 As shown, in one embodiment of the present invention, the connector 524 is an end plate 525 located on the end face of the second housing 521, and the end plate 525 is provided with a plurality of pressing surfaces 5251. In the embodiment illustrated in the present invention, there are three pressing surfaces 5251, which are evenly distributed circumferentially.

[0046] The outer casing 1 has an opening 111 for disassembling the second aftertreatment carrier assembly 52. ​​The exhaust gas aftertreatment package 100 includes an end cap assembly 112 for engaging with the opening 111 and a clamp 115 for disassembling the end cap assembly 112. Specifically, the outer casing 1 has a first flange 1111 located at the opening 111. The end cap assembly 112 includes an end cap 1121, a second flange 1122 formed on the end cap 1121, and a force-applying component mounted on the end cap 1121. The exhaust gas aftertreatment package 100 also includes a first sealing gasket 114 clamped between the first flange 1111 and the second flange 1122 to achieve a better seal. The force-applying component passes through the end cap 1121 and can push the connector 524 to make the second housing 521 tightly abut against the sealing member 523 to achieve a better seal.

[0047] The force-applying component is bolt assembly 113. Please refer to... Figure 3 As shown, in one embodiment of the present invention, the bolt assembly 113 comprises three groups, each group including a bolt 1131 and an internal thread that mates with the bolt 1131. Rotating the bolt 1131 adjusts the length of the bolt 1131 protruding from the end cap 1121; as the length of the bolt 1131 protruding from the end cap 1121 increases, the bolt 1131 can push the second housing 521 of the second post-processing carrier assembly 52 to move, thereby achieving a better seal. In the illustrated embodiment of the present invention, each bolt assembly 113 includes two nuts, with the internal thread formed on the inner surface of these two nuts. One nut is welded to the end cap 1121, and the other nut is adjacent to it. The bolt 1131 passes through these two nuts. By providing two nuts, loosening of the bolt 1131 can be prevented, thereby improving its reliability when abutting against the second housing 521.

[0048] Please refer to Figure 5 , Figure 8 as well as Figure 10As shown, the third housing 531 is provided with a plurality of protrusions 5311 fixed to the second baffle 22 and an airflow channel 5312 located between two adjacent protrusions 5311. The airflow channel 5312 penetrates the second baffle 22. Specifically, the second connecting cavity 412 is connected to the airflow channel 5312, the airflow channel 5312 is connected to the opening 224, the opening 224 is connected to the third connecting cavity 421, and the third connecting cavity 421 is connected to the inlet of the third post-processing carrier assembly 53. In the embodiment illustrated in the present invention, the plurality of protrusions 5311 are welded and fixed to the third side surface 221. This arrangement avoids the coaxiality requirement required because the third housing 531 passes through two baffles. Welding the protrusions 5311 to the second baffle 22 reduces the welding requirements and facilitates assembly. In addition, the clever design of the airflow channel 5312 avoids increasing the number of parts and saves costs.

[0049] The support assembly 7 includes a first support 71 and a second support 72 arranged in parallel, a first connecting portion 73 and a second connecting portion 74 connecting the first support 71 and the second support 72, and two sets of rope assemblies 75 connected to the first support 71 and the second support 72. The rope assemblies 75 are tied to the outer shell 1.

[0050] In use, firstly, the engine exhaust gas flows into the exhaust aftertreatment package 100 through the intake pipe 31; then, the exhaust gas enters the intake chamber 431 and flows to the inlet of the first aftertreatment carrier assembly 51; then, the exhaust gas passes through the first aftertreatment carrier assembly 51 and the second aftertreatment carrier assembly 52, and enters the first connecting chamber 411; then, the exhaust gas spins through the swirl vane 611 and enters the mixing pipe 61; when the injection conditions are met, the urea nozzle sprays atomized urea droplets into the mixing pipe 61. Under the action of the exhaust gas heat, the urea droplets undergo pyrolysis and hydrolysis to produce ammonia, and react chemically with the exhaust gas to reduce the concentration of harmful substances; the airflow enters the second connecting chamber 412 from the end 612 of the mixing pipe 61; then, the airflow passes through the airflow channel 5312 into the third connecting chamber 421, and passes through two sets of third aftertreatment carrier assemblies 53; then, the airflow enters the exhaust chamber 441 and finally leaves from the exhaust pipe 32.

[0051] 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 those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements 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 exhaust gas aftertreatment package, comprising an outer shell, a first baffle and a second baffle arranged at intervals within the outer shell, a second aftertreatment carrier assembly within the outer shell, a third aftertreatment carrier assembly downstream of the second aftertreatment carrier assembly, and a mixing pipe assembly communicating between the second aftertreatment carrier assembly and the third aftertreatment carrier assembly; the first baffle has a first side facing the second baffle and a second side opposite to the first side, the second baffle has a third side facing the first baffle and a fourth side opposite to the third side; the third aftertreatment carrier assembly includes a third housing and a third catalyst carrier encapsulated within the third housing, characterized in that: The exhaust aftertreatment package includes a first connecting cavity located on the fourth side of the second baffle and a second connecting cavity located between the first baffle and the second baffle. The third housing is provided with a plurality of protrusions fixed to the second baffle and an airflow channel located between two adjacent protrusions. The airflow channel passes through the second baffle. The first connecting cavity is connected to the second aftertreatment carrier assembly, and the second connecting cavity is connected to the third aftertreatment carrier assembly through the airflow channel.

2. The exhaust gas aftertreatment packaging as described in claim 1, characterized in that: The first baffle is provided with a positioning opening for positioning the third housing, the second baffle is provided with an opening, the plurality of protrusions are welded and fixed to the third side, and the airflow channel is connected to the opening.

3. The exhaust gas aftertreatment packaging as described in claim 2, characterized in that: The first baffle is provided with a second protrusion formed by stamping and protruding from the fourth side. The second protrusion forms the opening and is provided with a third connecting cavity that communicates with the inlet of the third post-processing carrier assembly.

4. The exhaust gas aftertreatment packaging as described in claim 1, characterized in that: The mixing tube assembly includes an end portion extending into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, and a gap exists between the end portion and the first baffle.

5. The exhaust gas aftertreatment packaging as described in claim 4, characterized in that: The mixing tube assembly includes a mixing tube and an expansion tube sleeved on the mixing tube. The mixing tube is provided with a plurality of swirling vanes communicating with the first connecting cavity. The second baffle is provided with an opening, and the swirling vanes are suspended in the opening. The mixing tube passes through the opening. The swirling vanes protrude from the fourth side of the second baffle to extend into the first connecting cavity, and the swirling vanes protrude from the third side of the second baffle to extend into the expansion tube. The expansion tube is fixed to the third side of the second baffle and sealed around the opening.

6. The exhaust gas aftertreatment packaging as described in claim 5, characterized in that: The expansion cylinder has an expansion cavity and an end wall, the expansion cavity being connected to the opening; the end wall has a through hole for the mixing tube to pass through, and the mixing tube is fixed on the end wall, with the end located on the mixing tube.

7. The exhaust gas aftertreatment packaging as described in claim 4, characterized in that: The first baffle has an arc-shaped recess corresponding to the end, and the arc-shaped recess is recessed from the first side to the second side.

8. The exhaust gas aftertreatment packaging as described in claim 5, characterized in that: The exhaust gas aftertreatment package includes a mounting cover installed on the mixing pipe and a urea nozzle mounting seat fixed on the mounting cover, wherein the mounting cover and the end are respectively located at both ends of the mixing pipe; the mounting cover has a first raised portion and a plurality of positioning grooves located around the periphery of the first raised portion, and the first raised portion has a mounting hole; the urea nozzle mounting seat has a plurality of positioning feet that are engaged in the plurality of positioning grooves and a second raised portion that protrudes toward the first raised portion, the second raised portion is inserted into the mounting hole and welded to the mounting cover, and the second raised portion has a nozzle hole for mounting the urea nozzle.

9. The exhaust gas aftertreatment packaging as described in claim 1, characterized in that: The exhaust aftertreatment package includes a first protrusion fixed to the fourth side of the second baffle, and the first connecting cavity is formed within the first protrusion.

10. The exhaust gas aftertreatment packaging as described in claim 1, characterized in that: The second aftertreatment carrier assembly includes a second housing and a diesel particulate filter encapsulated within the second housing; the exhaust aftertreatment encapsulation includes a cylindrical portion sleeved around the periphery of the second housing, and the second aftertreatment carrier assembly is detachably installed within the cylindrical portion.

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