WO2019144599A1

WO2019144599A1 - Exhaust inlet pipe and exhaust post-treatment apparatus thereof

Info

Publication number: WO2019144599A1
Application number: PCT/CN2018/100370
Authority: WO
Inventors: 吕春虎; 李伟
Original assignee: 天纳克（苏州）排放系统有限公司
Priority date: 2018-01-26
Filing date: 2018-08-14
Publication date: 2019-08-01
Also published as: CN110080868A

Abstract

An exhaust inlet pipe (12) and an exhaust post-treatment apparatus (300) thereof. The exhaust inlet pipe (12) comprises a first housing part (121) and a second housing part (122). The first housing part (121) comprises an end part (1211) and an arced part (1212) extending from the end part (1211). The end part (1211) is provided with a first edge (1213). The arced part (1212) is provided with an outlet end surface (1215). The outlet end surface (1215) is arranged on the inside of the first edge (1213). The second housing part (122) is provided with a second edge (1221) joined with the first edge (1213). The first edge (1213) and the second edge (1221) are welded together to jointly form a gas inlet pipe. The gas inlet pipe is provided with an inlet cross-section (M). The outlet end surface (1215) at least partly protrudes into the area of the inlet cross-section (M).

Description

Exhaust inlet pipe and exhaust aftertreatment device

The present application claims priority to Chinese Patent Application No. 20, 181, 007, 819, filed on Jan. 26, 2018, entitled "Exhaust Inlet Pipe and Its Exhaust Aftertreatment Device", the entire contents of which are incorporated by reference. In this application.

Technical field

The invention relates to an exhaust gas inlet pipe and an exhaust gas aftertreatment device thereof, and belongs to the technical field of engine exhaust gas aftertreatment.

Background technique

Chinese Utility Model Patent No. CN204113400U, issued Jan. 21, 2015, discloses an exhaust aftertreatment device including an intake manifold assembly and a post-processing carrier downstream of the intake manifold assembly, wherein the intake manifold assembly includes a cartridge Body and intake pipe. This design makes the length of the intake pipe assembly large and the application range is greatly limited.

Studies have shown that the uniformity of ammonia distribution in the exhaust aftertreatment system (eg, selective catalytic reduction system, SCR system) has an important impact on the overall performance and durability of the system. If the distribution of ammonia (NH ₃ ) is uneven, the nitrogen oxide (NOx) conversion efficiency is too low, and if the urea injection amount is increased in order to satisfy the discharge performance, ammonia leakage contamination is likely to occur. At the same time, the urea droplets are easily deposited when they are exposed to a wall surface having a relatively low temperature, and when the crystal is severely formed, the exhaust pipe is blocked, resulting in a decrease in engine power performance. Increasing the mixing uniformity of ammonia molecules can effectively improve the urea utilization rate and reduce the urea injection amount, thereby reducing the risk of urea crystallization.

Summary of the invention

It is an object of the present invention to provide an exhaust gas inlet pipe having a small length and an exhaust gas aftertreatment device thereof.

In order to achieve the above object, the present invention adopts the following technical solution: an exhaust gas inlet pipe including a first casing portion and a second casing portion cooperating with the first casing portion; the first casing The portion includes a tip portion and an arc portion extending from the end portion, the end portion forming a portion of the intake duct, the end portion being provided with a first edge, the curved portion being provided with an exit end face and a sensor mount for mounting a sensor; the second housing portion is provided with a second edge that engages the first edge, the first edge and the second edge being welded together to form the intake duct; The intake duct is provided with an inlet section that at least partially projects into the area of the inlet section.

As a further improvement of the present invention, the exhaust gas inlet pipe includes an intake flange that is at least partially sleeved outside the intake pipe and fixed to the intake pipe.

As a further improvement of the present invention, the seam of the first edge and the second edge is substantially L-shaped.

The invention further relates to an exhaust aftertreatment device comprising a first aftertreatment component and a second aftertreatment component arranged side by side of the first aftertreatment component, the first aftertreatment component comprising a first carrier component, located An exhaust inlet tube on one side of the first carrier assembly and a first mixing chamber assembly on the other side of the first carrier assembly; the second aftertreatment assembly includes a second carrier assembly, located in the An exhaust outlet tube on one side of the second carrier assembly and a second mixing chamber assembly on the other side of the second carrier assembly, the first mixing chamber assembly being located with the second mixing chamber assembly On the same side of the exhaust aftertreatment device, the first mixing chamber assembly includes a first mixing tube therein and a porous tube at least partially located within the first mixing tube, the first mixing tube further including a plurality of circumferentially distributed swirl fins and a slot corresponding to the swirl fins; the second mixing cavity assembly including a second mixing tube therein and a flap in the second mixing tube , said a sheet having a plurality of first openings for urea fracture, the second mixing tube being provided with a plurality of second openings distributed on a peripheral wall thereof; the porous tube further extending into the second mixing tube and located at the An upstream portion of the baffle; the exhaust gas inlet pipe being the aforementioned exhaust gas inlet pipe, the first carrier component at least partially protruding into a region of the inlet cross section.

As a further improved technical solution of the present invention, the first mixing cavity assembly and the second mixing cavity assembly are detachably coupled together.

As a further improved technical solution of the present invention, the exhaust aftertreatment device has a U shape, and the first carrier component includes a diesel oxidation catalyst and a diesel particulate trap located downstream of the diesel oxidation catalyst, the second The carrier component includes a selective catalytic reducing agent.

As a further improved technical solution of the present invention, the first mixing chamber assembly is provided with a top wall, and the top wall is provided with an injection hole for the urea nozzle to spray urea droplets into the porous tube.

As a further improved technical solution of the present invention, the first mixing tube includes a tapered portion, and the swirling fin and the groove are disposed on the tapered portion; one end of the porous tube is adjacent to the injection hole .

As a further improved technical solution of the present invention, the second mixing tube is provided with an arc-shaped end bowl at the bottom and for forcing the airflow to reverse; the second mixing chamber assembly includes a side surface and The airflow coming out of the second mixing tube is directed to the curved end cap of the second carrier assembly.

As a further improved technical solution of the present invention, the first mixing tube extends beyond the first mixing chamber assembly, and the second mixing tube extends beyond the second mixing chamber assembly, the first mixing tube and The second mixing tube is detachably connected by a clamp.

Compared with the prior art, the present invention fully utilizes the cross-sectional area of the curved portion to perform exhaust gas distribution by providing the first housing portion and the second housing portion assembled by the joint, and reduces the exhaust inlet tube. And the length of its exhaust aftertreatment device.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic side view of an exhaust aftertreatment device of the present invention.

Figure 2 is a schematic cross-sectional view taken along line A-A of Figure 1.

Figure 3 is a partially exploded perspective view of the exhaust aftertreatment device of the present invention.

Figure 4 is a further exploded perspective view of Figure 3 with the exhaust inlet tubes separated.

Figure 5 is a partially exploded perspective view of the exhaust aftertreatment device of the present invention with the DPF carrier assembly separated.

Figure 6 is a further exploded perspective view of Figure 5.

Figure 7 is a further exploded perspective view of Figure 6.

Figure 8 is a perspective view of the exhaust gas inlet pipe of Figure 1.

Figure 9 is a front elevational view of Figure 8.

Figure 10 is a plan view of Figure 8.

Figure 11 is an exploded perspective view of Figure 8.

Figure 12 is an exploded perspective view of another angle of Figure 11;

Figure 13 is a perspective schematic view of another embodiment of an exhaust gas inlet tube.

Figure 14 is a plan view of Figure 13 .

Figure 15 is a front elevational view of Figure 13 .

Detailed ways

Referring to FIGS. 1 through 7, the present invention discloses an exhaust aftertreatment device 300 that includes a first aftertreatment assembly 100 and a second aftertreatment assembly 200 in which the first aftertreatment assembly 100 is arranged side by side. The first aftertreatment assembly 100 includes a first carrier assembly 11, an exhaust inlet tube 12 on one side of the first carrier assembly 11, and a first mixing chamber on the other side of the first carrier assembly 11. Body assembly 13. The second aftertreatment assembly 200 includes a second carrier assembly 21, an exhaust outlet tube 22 on one side of the second carrier assembly 21, and a second mixing chamber on the other side of the second carrier assembly 21. Body assembly 23.

In the illustrated embodiment of the invention, the exhaust aftertreatment device 300 is U-shaped. The first mixing chamber assembly 13 and the second mixing chamber assembly 23 are located on the same side of the exhaust aftertreatment device 300.

In the illustrated embodiment of the invention, the first carrier component 11 includes a diesel oxidation catalyst (DOC) and a diesel particulate trap (DPF) located downstream of the diesel oxidation catalyst, the second carrier component 21 Includes a selective catalytic reduction agent (SCR).

The first mixing chamber assembly 13 and the second mixing chamber assembly 23 are detachably coupled for ease of maintenance.

The first mixing chamber assembly 13 includes a first mixing tube 131 located therein and a porous tube 132 at least partially located within the first mixing tube 131. The first mixing tube 131 includes a tapered portion 133 including a plurality of swirl fins 134 distributed in the circumferential direction and a slit 135 corresponding to the swirl fins 134.

The first mixing chamber assembly 13 is provided with a top wall 136 provided with an injection hole 137 for a urea nozzle (not shown) to inject urea droplets into the porous tube 132. One end of the porous tube 132 is adjacent to the injection hole 137.

The second mixing chamber assembly 23 includes a second mixing tube 231 located therein and a flap 232 located in the second mixing tube 231. The flap 232 is provided with a plurality of first openings 233 for urea fracture. The second mixing tube 231 is provided with a plurality of second openings 234 distributed on the peripheral wall thereof. The porous tube 132 further extends into the second mixing tube 231 and is located upstream of the flap 232. The second mixing tube 231 is provided with an arcuate end bowl 234 at the bottom and for forcing the air flow to reverse. The second mixing chamber assembly 23 includes an arcuate end cap 235 located on the side and for directing airflow from the second mixing tube 231 toward the second carrier assembly 21. In addition, the flap 232 can prevent excess urea from being directly sprayed on the end cap 235 to form crystals.

In the illustrated embodiment of the invention, the first mixing tube 131 extends beyond the first mixing chamber assembly 13 and the second mixing tube 231 extends beyond the second mixing chamber assembly 23, The first mixing tube 131 and the second mixing tube 231 are detachably connected by a clamp 236.

Referring to Figures 8 to 12, the exhaust gas inlet pipe 12 of the present invention is of a flat design to reduce the length of the entire exhaust gas after-treatment device 300, thereby being able to better accommodate strict installation space.

In a first embodiment of the exhaust gas inlet tube 12 of the present invention, the exhaust gas inlet tube 12 includes a first housing portion 121, a second housing portion 122 that mates with the first housing portion 121, and a connection. The first housing portion 121 and the intake flange 123 of the second housing portion 122.

The first housing portion 121 includes a distal end portion 1211 and an arcuate portion 1212 extending from the distal end portion 1211. The tip portion 1211 forms a portion of the intake duct. In the illustrated embodiment of the invention, the distal end portion 1211 has an arc shape. The tip end portion 1211 is provided with a first edge 1213. The curved portion 1212 is provided with a sensor holder 1214 for mounting a sensor. The curved portion 1212 is provided with an outlet end surface 1215 located inside the first edge 1213, that is, viewed from the position shown in FIG. 9, the outlet end surface 1215 is lower than the first edge 1213 .

The second housing portion 122 is provided with a second edge 1221 that engages the first edge 1213. The seam of the first edge 1213 and the second edge 1221 is substantially L-shaped. Referring to FIG. 9, in the illustrated embodiment of the present invention, the first edge 1213 and the second edge 1221 are welded together to form an intake duct. The intake duct is provided with an inlet section M, the first carrier component 11 at least partially projecting into the region of the inlet section M. At the same time, the outlet end face 1215 also at least partially projects into the region of the inlet section M. With this arrangement, the length of the exhaust aftertreatment device 300 can be reduced. In the illustrated embodiment of the invention, the intake flange 123 is at least partially sleeved outside the intake duct and secured to the intake duct. The intake flange 123 includes a flange 1231 located outside the intake duct.

13 to 15 disclose a second embodiment of the exhaust gas inlet pipe 12 of the present invention, which differs from the first embodiment in that the intake flange 123 is not provided.

It should be noted that the orientations of "upper", "lower", "top", "bottom", "below" and the like described in the present invention should not be construed as limited, because these positions are different depending on the position of the components. Relationships should also be adaptively understood. In addition, the above embodiments are only intended to illustrate the present invention and do not limit the technical solutions described in the present invention, and the understanding of the present specification should be based on those skilled in the art. Although the present invention has been described in detail with reference to the embodiments of the present invention, it will be understood by those skilled in the art that the invention may be modified or equivalently substituted without departing from the invention. The spirit and scope of the invention and its modifications are intended to be included within the scope of the appended claims.

Claims

An exhaust inlet tube including a first housing portion and a second housing portion mating with the first housing portion; wherein the first housing portion includes a tip portion and from the a curved portion extending from the end portion, the end portion forming a portion of the intake duct, the end portion being provided with a first edge, the curved portion being provided with an exit end surface and a sensor seat for mounting the sensor; a second housing portion is provided with a second edge that engages the first edge, the first edge and the second edge are welded together to form the intake duct; the intake duct is provided with an inlet In cross section, the outlet end face at least partially projects into the region of the inlet section.
The exhaust gas inlet pipe according to claim 1, wherein said exhaust gas inlet pipe includes an air intake method at least partially trapped outside said intake pipe and fixed to said intake pipe Lan.
The exhaust inlet duct of claim 1 wherein the seam of the first edge and the second edge is generally L-shaped.
An exhaust aftertreatment device comprising a first aftertreatment component and a second aftertreatment component arranged side by side of the first aftertreatment component, the first aftertreatment component comprising a first carrier component, located at the first An exhaust inlet tube on one side of the carrier assembly and a first mixing chamber assembly on the other side of the first carrier assembly; the second aftertreatment assembly includes a second carrier assembly, located in the second carrier assembly An exhaust outlet tube on one side and a second mixing chamber assembly on the other side of the second carrier assembly, the first mixing chamber assembly and the second mixing chamber assembly being located in the exhaust The same side of the aftertreatment device, characterized in that said first mixing chamber assembly comprises a first mixing tube located therein and a porous tube at least partially located within said first mixing tube, said first mixing tube further comprising a plurality of circumferentially distributed swirl fins and a slot corresponding to the swirl fins; the second mixing cavity assembly including a second mixing tube therein and a flap in the second mixing tube , said a sheet having a plurality of first openings for urea fracture, the second mixing tube being provided with a plurality of second openings distributed on a peripheral wall thereof; the porous tube further extending into the second mixing tube and located at the The exhaust gas inlet pipe is an exhaust gas inlet pipe according to any one of claims 1 to 3, the first carrier component at least partially protruding into a region of the inlet cross section.
The exhaust aftertreatment device of claim 4 wherein said first mixing chamber assembly and said second mixing chamber assembly are detachably coupled together.
The exhaust aftertreatment device according to claim 4, wherein said exhaust aftertreatment device is U-shaped, said first carrier assembly comprising a diesel oxidation catalyst and diesel particulates located downstream of said diesel oxidation catalyst A trap, the second carrier component comprising a selective catalytic reducing agent.
The exhaust aftertreatment device according to claim 4, wherein said first mixing chamber assembly is provided with a top wall, said top wall being provided for a urea nozzle to inject urea droplets into said porous tube Spray holes.
The exhaust aftertreatment device according to claim 7, wherein said first mixing tube comprises a tapered portion, said swirl fins and slots are disposed on said tapered portion; said porous One end of the tube is adjacent to the injection hole.
The exhaust aftertreatment device of claim 4 wherein said second mixing tube is provided with an arcuate end bowl at the bottom for forcing the flow of gas to reverse; said second mixing chamber assembly being located a curved end cap for guiding the airflow emerging from the second mixing tube toward the second carrier assembly.
The exhaust aftertreatment device of claim 4 wherein said first mixing tube extends beyond said first mixing chamber assembly and said second mixing tube extends beyond said second mixing chamber assembly The first mixing tube and the second mixing tube are detachably connected by a clamp.