CN211924298U - Tail gas aftertreatment encapsulation - Google Patents

Abstract

An exhaust aftertreatment package comprising an outer shell, first and second baffles positioned within the outer shell and spaced apart from each other, a first aftertreatment carrier assembly, a second aftertreatment carrier assembly, a third aftertreatment carrier assembly positioned within the outer shell, and a mixing tube assembly communicating between the second and third aftertreatment carrier assemblies; the tail gas aftertreatment package comprises a first connecting cavity positioned on the fourth side surface of the second baffle and a second connecting cavity positioned between the first baffle and the second baffle; the mixing tube assembly includes a tip that extends into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, a gap being provided between the tip and the first baffle. So set up, reduced the axiality requirement when mixing the assembly of pipe assembly, also saved a welding procedure, improved the equipment convenience of tail gas aftertreatment encapsulation.

Description

Tail gas aftertreatment encapsulation

Technical Field

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

Background

With the increasing upgrading of emission legislation, existing exhaust aftertreatment packages are often provided with hybrid tube assemblies. The mixing tube assembly is typically welded at both ends to respective baffles. This design places high demands on the size of the openings in the baffle, the mounting of the mixing tube assembly and the welding, resulting in increased costs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an easily tail gas aftertreatment encapsulation of equipment.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an exhaust aftertreatment package comprising an outer shell, first and second baffles positioned within the outer shell and spaced apart, a first aftertreatment carrier assembly positioned within the outer shell, a second aftertreatment carrier assembly positioned downstream of the first aftertreatment carrier assembly, a third aftertreatment carrier assembly positioned downstream of the second aftertreatment carrier assembly, and a mixing tube assembly communicating between the second and third aftertreatment carrier assemblies; the first baffle plate is provided with a first side surface facing the second baffle plate and a second side surface opposite to the first side surface, and the second baffle plate is provided with a third side surface facing the first baffle plate and a fourth side surface opposite to the third side surface; the tail gas aftertreatment package comprises a first connecting cavity positioned on the fourth side surface of the second baffle and a second connecting cavity positioned between the first baffle and the second baffle, the first connecting cavity is communicated with the second aftertreatment carrier assembly, and the second connecting cavity is communicated with the third aftertreatment carrier assembly; the mixing tube assembly includes a tip that extends into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, a gap being provided between the tip and the first baffle.

As a further improved technical solution of the present invention, the mixing tube assembly comprises a mixing tube and an extension tube sleeved on the mixing tube, the mixing tube is provided with a plurality of spinning disks communicated with the first connecting cavity, the second baffle is provided with an opening, the spinning disks are suspended in the opening, and the mixing tube passes through the opening; the spinning disk protrudes out of the fourth side face of the second baffle to extend into the first connecting cavity, and the spinning disk protrudes out of the third side face of the second baffle to extend into the extension cylinder; the expansion cylinder is fixed on the third side surface of the second baffle plate and sealed at the periphery of the opening.

As a further improved technical solution of the present invention, the expansion cylinder is provided with an expansion cavity and an end wall, and the expansion cavity is communicated with the opening; the end wall is provided with a through hole for the mixing pipe to pass through, the mixing pipe is fixed on the end wall, and the tail end is positioned on the mixing pipe.

As a further improved technical solution of the present invention, the first baffle is provided with a recess corresponding to the end, and the recess is oriented from the first side to the second side.

As a further improved technical scheme of the utility model, the encapsulation of tail gas aftertreatment is including installing installation lid on the hybrid tube and fixing the urea nozzle mount pad that the installation was covered, wherein the installation lid with the end is located respectively the both ends of hybrid tube.

As a further improved technical solution of the present invention, the mounting cover is provided with a first protruding portion and a plurality of positioning grooves located at the periphery of the first protruding portion, and the first protruding portion is provided with a mounting hole; the urea nozzle mount pad is equipped with the card and holds a plurality of location feet in a plurality of constant head tanks and to the convex second uplift portion of first uplift portion, the second uplift portion insert in the mounting hole and with the installation lid welded fastening, the second uplift portion is equipped with the nozzle bore that is used for installing the urea nozzle.

As a further improved technical solution of the present invention, the second aftertreatment carrier assembly includes a second housing and a diesel particulate trap enclosed in the second housing; the tail gas aftertreatment package comprises a barrel body part sleeved on the periphery of the second shell, and the second aftertreatment carrier component is detachably mounted in the barrel body part.

As a modified technical scheme of the utility model, the tail gas aftertreatment encapsulation includes the intake pipe and fixes the convex closure that admits air of the second side of first baffle, the convex closure that admits air is equipped with the air intake cavity, wherein the one end of air intake cavity with the intake pipe is linked together, the other end of air intake cavity with the entry of first aftertreatment carrier subassembly is linked together.

As the utility model discloses further modified technical scheme, the encapsulation of tail gas aftertreatment is including fixing the first convex closure of the fourth side of second baffle, first connection cavity forms in the first convex closure.

As a further improved technical solution of the present invention, the exhaust gas aftertreatment package includes a third connecting cavity formed on the fourth side of the second baffle plate and communicated with the inlet of the third aftertreatment carrier assembly, and the third connecting cavity is communicated with the second connecting cavity; the tail gas aftertreatment package comprises a gas outlet pipe and a gas outlet convex hull fixed on the second side face of the first baffle, the gas outlet convex hull is provided with a gas outlet cavity communicated with the outlet of the third aftertreatment carrier component, and the gas outlet pipe is communicated with the gas outlet cavity.

Compared with the prior art, the utility model discloses a have the clearance between the end with the hybrid tube subassembly and the first baffle to avoided the both ends welding of hybrid tube subassembly, reduced the axiality requirement when hybrid tube subassembly equipment, also saved one welding procedure, improved the equipment convenience of tail gas aftertreatment encapsulation.

Drawings

Fig. 1 is a schematic perspective view of the exhaust aftertreatment package according to the first embodiment of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a partially exploded perspective view of fig. 1.

Fig. 4 is a further exploded perspective view of fig. 3.

Fig. 5 is a perspective view of the outer case of fig. 1 removed.

Fig. 6 is a perspective view of fig. 5 from another angle.

Fig. 7 is a top view of fig. 6.

Fig. 8 is a partially exploded perspective view of fig. 5.

Fig. 9 is a partially exploded perspective view of fig. 6.

Fig. 10 is a further exploded perspective view of fig. 9.

FIG. 11 is a perspective view of the end cap assembly.

Fig. 12 is a perspective view of fig. 11 from another angle.

Fig. 13 is an exploded perspective view of fig. 11.

Fig. 14 is a schematic sectional view taken along line D-D in fig. 2.

Fig. 15 is a partially enlarged view of circled portion E in fig. 14.

Fig. 16 is a schematic sectional view taken along line F-F in fig. 2.

Fig. 17 is a schematic sectional view taken along line G-G in fig. 2.

Fig. 18 is a schematic sectional view taken along line H-H in fig. 2.

Detailed Description

The present invention will be described in detail with reference to the drawings, wherein if there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the accompanying drawings, like numbers or symbols in different drawings represent the same or similar elements unless otherwise specified. The matters described in the following exemplary embodiments do not represent all embodiments of the present invention, but rather they are merely examples of products consistent with the present invention as recited in the claims of the present invention.

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. It should be understood that the terms "first," "second," and the like as used in the description and in the claims of the present invention do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

Referring to fig. 1 to 18, the present invention discloses an exhaust gas post-treatment package 100, which includes an outer casing 1, a first baffle 21 and a second baffle 22 disposed in the outer casing 1 at an interval, an inlet pipe 31 for the exhaust gas to enter, an outlet pipe 32 for the exhaust gas to flow out, a first post-treatment carrier component 51, a second post-treatment carrier component 52, a third post-treatment carrier component 53, a mixing pipe component 6, and a bracket component 7 mounted on the outer casing 1.

In one embodiment of the present invention, the first aftertreatment support assembly 51 includes a first housing 511 and a Diesel Oxidation Catalyst (DOC)512 enclosed within the first housing 511; the second aftertreatment carrier assembly 52 includes a second housing 521 and a diesel particulate trap (DPF)522 enclosed within the second housing 521; the third aftertreatment support assembly 53 includes a third housing 531 and a third catalyst support 532 enclosed within the third housing 531, the third catalyst support 532 may be a Selective Catalytic Reduction (SCR). 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 tube assembly 6 communicates between the second aftertreatment carrier assembly 52 and the third aftertreatment carrier assembly 53.

Referring to fig. 5 and 6, the first baffle 21 has a first side surface 211 facing the second baffle 22 and a second side surface 212 opposite to the first side surface 211. The second shutter 22 is provided with a third side 221 facing the first shutter 21 and a fourth side 222 opposite to the third side 221.

In the illustrated embodiment of the present invention, the exhaust aftertreatment package 100 includes an air inlet convex hull 43 welded to the second side 212 of the first baffle 21, an air outlet convex hull 44 welded to the second side 212 of the first baffle 21, and a first convex hull 41 welded to the fourth side 222 of the second baffle 22. The intake convex hull 43 is provided with an intake cavity 431, wherein one end (e.g., the upper end in fig. 8) of the intake cavity 431 is communicated with the intake pipe 31, and the other end (e.g., the lower end in fig. 8) of the intake cavity 431 is communicated with the inlet of the first aftertreatment carrier assembly 51. The air outlet convex hull 44 is provided with an air outlet cavity 441 communicated with the outlet of the third aftertreatment carrier assembly 53, and the air outlet pipe 32 is communicated with the air outlet cavity 441.

The first convex hull 41 is provided with a first connection cavity 411. The exhaust aftertreatment package 100 includes a second connecting cavity 412 between the first baffle 21 and the second baffle 22. The first connecting chamber 411 is in communication with the second aftertreatment carrier assembly 52, and the second connecting chamber 412 is in communication with the third aftertreatment carrier assembly 53.

In the illustrated embodiment of the present invention, the air inlet pipe 31 is substantially located in the second connecting cavity 412 and penetrates through the first baffle 21. The first baffle 21 further includes a positioning hole 213 for positioning the third housing 531. In addition, referring to fig. 8 and 16, the first baffle 21 is further provided with an arc-shaped recess 214 corresponding to the mixing tube assembly 6, and the arc-shaped recess 214 is recessed from the first side surface 211 to the second side surface 212. The arc-shaped recess 214 is used for reversing the airflow to improve the uniformity of the airflow.

The second baffle 22 is provided with an opening 223 matched with the mixing pipe assembly 6 and a second convex hull 42 which is formed by punching and protrudes out of the fourth side surface 222. In the process of forming the second convex hull 42, an opening 224 is also formed in the second shutter 22. The second convex hull 42 is provided with a third connecting cavity 421 communicating with the inlet of the third aftertreatment carrier assembly 53.

The mixing tube assembly 6 comprises a mixing tube 61 and an expansion cylinder 62 sleeved on the mixing tube 61. The mixing pipe 61 is provided with a plurality of spinning disks 611 communicated with the first connection chamber 411. Referring to fig. 9 and 17, the spinning disk 611 is suspended in the opening 223. The mixing tube 61 passes through the opening 223. Specifically, the spinning disk 611 protrudes from the fourth side 222 of the second baffle 22 to extend into the first connecting cavity 411, and the spinning disk 611 protrudes from the third side 221 of the second baffle 22 to extend into the extension cylinder 62. The expansion cylinder 62 is fixed to the third side 221 of the second baffle 22 and sealed around the opening 223. The expansion cylinder 62 is provided with an expansion cavity 621 and an end wall 622, and the expansion cavity 621 is communicated with the opening 223; the end wall 622 is provided with perforations 6221 through which the mixing tube 61 passes, and the mixing tube 61 is fixed to the end wall 622. The mixing tube 61 comprises an end 612 extending into the second connecting chamber 412, wherein a gap 613 is provided between the end 612 and the first baffle 21. So set up, mix tubular component 6 only need one end welding can, to the too high requirement of axiality when having avoided both ends welding, improved the convenience of equipment, the cost is reduced. In other words, when the mixing tube assembly 6 is fixedly welded to the second baffle 22, even if the mixing tube 61 is inclined in the second coupling cavity 412, it does not have a serious influence.

Referring to fig. 11 to 13, the exhaust gas aftertreatment package 100 further includes a mounting cover 63 mounted on the mixing tube 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 two ends of the mixing tube 61. The mounting cover 63 is provided with a first rising part 631 at the center and a plurality of positioning grooves 632 at the periphery of the first rising part 631, and the first rising part 631 is provided with a mounting hole 6311. The urea nozzle mount 64 is provided with a plurality of positioning legs 642 retained in the plurality of positioning grooves 632 and a second bump 641 protruding toward the first bump 631. When assembled, the second bump 641 is inserted into the mounting hole 6311 and is welded to the mounting cover 63. The second bump 641 is provided with a nozzle hole 6411 to mount a urea nozzle. In addition, in the illustrated embodiment of the present invention, the outer periphery of the urea nozzle mount 64 is optimally designed to have a welding relief 643 to facilitate the insertion of a welding gun to weld and fix the mount cap 63 to the mixing tube 61.

Referring to fig. 14 and 15, the exhaust gas aftertreatment package 100 includes a barrel portion 23 penetrating through 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 case 511 and the second case 521 are both housed in the barrel portion 23. The barrel portion 23 is provided with a first projection 231 (e.g., flare or flange) projecting radially outwardly. The second housing 521 is provided with a second projection 520 projecting radially outward. The exhaust aftertreatment package 100 further includes a seal 523 sandwiched between the first boss 231 and the second boss 520. In an embodiment of the present invention, the sealing member 523 is a sealing gasket sleeved on the second housing 521.

The exhaust aftertreatment package 100 further includes a connector 524 fixed to the second housing 521. Referring to fig. 4, in an embodiment of the present invention, the connecting element 524 is an end plate 525 located at an end surface of the second housing 521, and the end plate 525 is provided with a plurality of pressing surfaces 5251. In the illustrated embodiment of the present invention, the pressing surfaces 5251 are three and evenly distributed along the circumferential direction.

The outer housing 1 is provided with an opening 111 for removal of the second aftertreatment carrier assembly 52. The exhaust aftertreatment package 100 includes an end cap assembly 112 configured to mate with the opening 111 and a clip 115 configured to remove the end cap assembly 112. In particular, the outer housing 1 is provided with a first flange 1111 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 application member mounted on the end cap 1121. The exhaust aftertreatment package 100 further includes a first sealing gasket 114 sandwiched between the first flange 1111 and the second flange 1122 to achieve a better seal. The force application part penetrates through the end cover 1121, and can push the connecting piece 524 so as to enable the second shell 521 to tightly abut against the sealing element 523, so that better sealing is achieved.

The force applying member is a bolt assembly 113. Referring to fig. 3, in an embodiment of the present invention, the bolt assemblies 113 are three groups, each group including a bolt 1131 and an internal thread matching with the bolt 1131. When the bolts 1131 are rotated, the length of the bolts 1131 protruding out of the end cover 1121 can be adjusted; as the length of the bolts 1131 protruding through the end cap 1121 increases, the bolts 1131 can push the second housing 521 of the second aftertreatment carrier assembly 52 to move for a better seal. In the illustrated embodiment of the present invention, each set of bolt assemblies 113 includes two nuts, and the internal threads are formed on the inner surfaces of the two nuts. One of the nuts is welded and fixed to the end cap 1121, and the other nut is close to the nut. The bolt 1131 passes through the two nuts. By providing two nuts, the bolt 1131 can be prevented from loosening, thereby improving the reliability when it abuts against the second housing 521.

Referring to fig. 5, 8 and 10, the third housing 531 is provided with a plurality of protrusions 5311 fixed to the second baffle 22 and an air flow channel 5312 located between two adjacent protrusions 5311. The air flow passage 5312 penetrates the second baffle 22. Specifically, the second connecting cavity 412 is communicated with the gas flow channel 5312, the gas flow channel 5312 is communicated with the opening portion 224, the opening portion 224 is communicated with the third connecting cavity 421, and the third connecting cavity 421 is communicated with the inlet of the third aftertreatment carrier assembly 53. In the illustrated embodiment of the present invention, the plurality of protrusions 5311 are welded and fixed to the third side 221. With the arrangement, the coaxiality requirement required by the fact that the third shell 531 penetrates through the two baffles is avoided, the boss 5311 and the second baffle 22 are welded, the welding requirement is reduced, and assembly is facilitated. In addition, by skillfully designing the air flow channel 5312, the number of parts is prevented from being increased, and the cost is saved.

The bracket assembly 7 includes a first bracket 71 and a second bracket 72 arranged in parallel, a first connecting portion 73 and a second connecting portion 74 connecting the first bracket 71 and the second bracket 72, and two sets of rope assemblies 75 connected to the first bracket 71 and the second bracket 72. The rope assembly 75 is strapped to the outer case 1.

When in use, firstly, the exhaust gas of the engine flows into the exhaust gas aftertreatment package 100 from the air inlet pipe 31; the tail gas then enters the plenum 431 and flows to the inlet of the first aftertreatment carrier assembly 51; then, the exhaust gas passes through the first post-treatment carrier assembly 51 and the second post-treatment carrier assembly 52, and enters the first connection cavity 411; then, the tail gas enters the mixing pipe 61 from the rotation of the rotation plate 611; when the spraying condition is met, the urea nozzle sprays atomized urea liquid drops into the mixing pipe 61, the urea liquid drops are pyrolyzed and hydrolyzed under the action of the heat of the tail gas to generate ammonia gas, and the ammonia gas and the tail gas are subjected to chemical reaction to reduce the concentration of harmful substances; the gas flow enters the second connecting chamber 412 from the end 612 of the mixing tube 61; then, the air flows through the air flow passages 5312 into the third connecting cavities 421 and through the two sets of third aftertreatment carrier assemblies 53; the gas flow then enters outlet chamber 441 and finally exits outlet tube 32.

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. An exhaust aftertreatment package comprising an outer shell, first and second baffles positioned within the outer shell and spaced apart, a first aftertreatment carrier assembly positioned within the outer shell, a second aftertreatment carrier assembly positioned downstream of the first aftertreatment carrier assembly, a third aftertreatment carrier assembly positioned downstream of the second aftertreatment carrier assembly, and a mixing tube assembly communicating between the second and third aftertreatment carrier assemblies; the first baffle plate is provided with a first side surface facing the second baffle plate and a second side surface opposite to the first side surface, and the second baffle plate is provided with a third side surface facing the first baffle plate and a fourth side surface opposite to the third side surface; the method is characterized in that: the tail gas aftertreatment package comprises a first connecting cavity positioned on the fourth side surface of the second baffle and a second connecting cavity positioned between the first baffle and the second baffle, the first connecting cavity is communicated with the second aftertreatment carrier assembly, and the second connecting cavity is communicated with the third aftertreatment carrier assembly; the mixing tube assembly includes a tip that extends into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, a gap being provided between the tip and the first baffle.

2. The exhaust aftertreatment package of claim 1, wherein: the mixing pipe assembly comprises a mixing pipe and an extension barrel sleeved on the mixing pipe, the mixing pipe is provided with a plurality of spinning disks communicated with the first connecting cavity, the second baffle is provided with an opening, the spinning disks are arranged in the opening in a suspended mode, and the mixing pipe penetrates through the opening; the spinning disk protrudes out of the fourth side face of the second baffle to extend into the first connecting cavity, and the spinning disk protrudes out of the third side face of the second baffle to extend into the extension cylinder; the expansion cylinder is fixed on the third side surface of the second baffle plate and sealed at the periphery of the opening.

3. The exhaust aftertreatment package of claim 2, wherein: the expansion cylinder is provided with an expansion cavity and an end wall, and the expansion cavity is communicated with the opening; the end wall is provided with a through hole for the mixing pipe to pass through, the mixing pipe is fixed on the end wall, and the tail end is positioned on the mixing pipe.

4. The exhaust aftertreatment package of claim 1, wherein: the first baffle is provided with an arc-shaped concave part corresponding to the tail end, and the arc-shaped concave part is concave from the first side surface to the second side surface.

5. The exhaust aftertreatment package of claim 2, wherein: the tail gas aftertreatment encapsulation is including installing installation lid on the hybrid tube and fixing urea nozzle mount pad on the installation lid, wherein the installation lid with the end is located respectively the both ends of hybrid tube.

6. The exhaust aftertreatment package of claim 5, wherein: the mounting cover is provided with a first raised part and a plurality of positioning grooves positioned on the periphery of the first raised part, and the first raised part is provided with a mounting hole; the urea nozzle mount pad is equipped with the card and holds a plurality of location feet in a plurality of constant head tanks and to the convex second uplift portion of first uplift portion, the second uplift portion insert in the mounting hole and with the installation lid welded fastening, the second uplift portion is equipped with the nozzle bore that is used for installing the urea nozzle.

7. The exhaust aftertreatment package of claim 1, wherein: the second aftertreatment carrier assembly comprises a second housing and a diesel particulate trap enclosed within the second housing; the tail gas aftertreatment package comprises a barrel body part sleeved on the periphery of the second shell, and the second aftertreatment carrier component is detachably mounted in the barrel body part.

8. The exhaust aftertreatment package of claim 1, wherein: the tail gas aftertreatment package comprises an air inlet pipe and an air inlet convex hull fixed on the second side face of the first baffle, the air inlet convex hull is provided with an air inlet cavity, one end of the air inlet cavity is communicated with the air inlet pipe, and the other end of the air inlet cavity is communicated with an inlet of the first aftertreatment carrier assembly.

9. The exhaust aftertreatment package of claim 8, wherein: the exhaust gas aftertreatment package comprises a first convex hull fixed to a fourth side of the second baffle plate, and the first connection cavity is formed in the first convex hull.

10. The exhaust aftertreatment package of claim 9, wherein: the tail gas aftertreatment package comprises a third connecting cavity which is formed on the fourth side surface of the second baffle and communicated with the inlet of the third aftertreatment carrier assembly, and the third connecting cavity is communicated with the second connecting cavity; the tail gas aftertreatment package comprises a gas outlet pipe and a gas outlet convex hull fixed on the second side face of the first baffle, the gas outlet convex hull is provided with a gas outlet cavity communicated with the outlet of the third aftertreatment carrier component, and the gas outlet pipe is communicated with the gas outlet cavity.

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