CN117128076A

CN117128076A - Mixing tube assembly

Info

Publication number: CN117128076A
Application number: CN202311091274.1A
Authority: CN
Inventors: 王伟; 王晨; 蒋枫
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2023-11-28

Abstract

A mixing tube assembly comprising an inner tube and an outer tube sleeved on the inner tube. The inner tube comprises an open-hole tube and a swirl tube. The cyclone tube is provided with a cyclone sheet and an airflow inlet. The outer tube includes a first end portion and a second end portion opposite the first end portion, the first end portion being provided with a mounting portion protruding radially outwardly of the outer tube for mounting the outer tube on other components of the exhaust aftertreatment device. The mixing tube assembly further comprises a collar fixed to the first end, the collar protrudes out of the first end in a direction away from the second end, and the collar surrounds the peripheries of the swirl plates and forms airflow gaps with the swirl plates. The air flow flowing into the air flow gap can enable the air flow to flow into the air flow inlet better under the limit of the lantern ring, thereby being beneficial to enhancing rotational flow.

Description

Mixing tube assembly

Technical Field

The invention relates to a mixing pipe assembly, and belongs to the technical field of engine tail gas aftertreatment.

Background

The exhaust aftertreatment packages of the related art typically include a mixing tube assembly including an inner tube and an outer tube. The inner tube is provided with a plurality of swirl plates. The outer tube is used for installing and fixing other parts of the exhaust gas aftertreatment device.

It can be appreciated by those skilled in the art that by providing the swirl plate, the air flow passing through the swirl plate can enter the inner tube in a swirling manner to be better mixed with urea droplets, thereby reducing the risk of urea crystallization.

However, in the case where the outer tube is provided with a mounting portion, the dimension thereof in the axial direction is limited, which results in the swirl plate protruding outward by a large length of the outer tube, which is disadvantageous in forming a swirl flow.

Accordingly, there is a need for improvements in the mixing tube assemblies of the related art.

Disclosure of Invention

The invention aims to provide a mixing tube assembly with a good rotational flow effect.

In order to achieve the above purpose, the invention adopts the following technical scheme: a mixing tube assembly comprising an inner tube, an outer tube at least partially sleeved on the inner tube, and an annular space between the inner tube and the outer tube, the inner tube comprising an open-ended tube and a swirl tube secured to one end of the open-ended tube, the swirl tube being provided with a plurality of swirl vanes and an airflow inlet corresponding to each swirl vane; the outer tube comprises a first end part and a second end part opposite to the first end part, wherein the first end part is provided with a mounting part protruding outwards along the radial direction of the outer tube, and the mounting part is used for mounting the outer tube on other parts of the exhaust gas aftertreatment device; the mixing pipe assembly further comprises a collar fixed to the first end, the collar protrudes out of the first end in a direction away from the second end, the collar surrounds the peripheries of the swirl plates and forms air flow gaps with the swirl plates, and the air flow gaps are communicated with the air flow inlet; the swirl plates at least partially protrude out of the lantern ring along the axial direction of the inner tube.

As a further improved technical scheme of the invention, the collar is at least partially inserted into the outer tube along the axial direction of the outer tube, and the collar is welded and fixed with the outer tube.

As a further improved technical scheme of the invention, the mounting part is a flanging of the first end part.

As a further improved technical scheme of the invention, the cyclone tube comprises a first tube body, a second tube body and a conical tube connected between the first tube body and the second tube body, and the cyclone sheets and the airflow inlet are arranged on the conical tube.

As a further improved technical scheme of the invention, the mixing tube assembly comprises an end cover fixed in the first tube body and a urea nozzle mounting seat fixed on the end cover; the second pipe body is at least partially inserted into the perforated pipe and welded and fixed with the perforated pipe.

As a further improved technical scheme of the invention, the perforated pipe is provided with a plurality of first mounting claws positioned at one end of the perforated pipe and a plurality of second mounting claws positioned at the other end of the perforated pipe, and the plurality of first mounting claws and the plurality of second mounting claws are welded and fixed on the inner wall of the outer pipe.

As a further improved technical scheme of the invention, the lantern ring is provided with a plurality of first yielding grooves corresponding to the plurality of first mounting claws, and the outer tube is provided with a plurality of first plug welding holes corresponding to the plurality of first mounting claws so as to facilitate welding from outside.

As a further improved technical scheme of the invention, the outer tube is provided with a plurality of second plug welding holes corresponding to the plurality of second mounting claws so as to facilitate welding from outside.

As a further development of the invention, the mixing tube assembly further comprises a support ring mounted on the perforated tube for fixing the inner tube in the outer tube, the support ring being located in the annular space.

As a further improved technical solution of the present invention, the mixing tube assembly further comprises an air flow retainer mounted on the perforated tube, the air flow retainer being adjacent to the second tube body, the air flow retainer being located in the annular space to prevent air flow through the annular space.

Compared with the prior art, the invention has the advantages that the lantern ring fixed on the first end part is arranged, the lantern ring protrudes out of the first end part along the direction away from the second end part, the lantern ring surrounds the peripheries of the swirl plates and forms air flow gaps with the swirl plates, and the air flow flowing into the air flow gaps can better flow into the air flow inlet under the limit of the lantern ring, so that the swirl can be enhanced.

Drawings

Fig. 1 is a schematic perspective view of a mixing tube assembly of the present invention in a first embodiment.

Fig. 2 is a partially exploded perspective view of fig. 1.

Fig. 3 is a further exploded perspective view of fig. 2.

Fig. 4 is a schematic perspective view of another angle of fig. 1.

Fig. 5 is a front view of fig. 4.

Fig. 6 is a top view of fig. 5.

Fig. 7 is a schematic cross-sectional view taken along line A-A in fig. 6.

Fig. 8 is a partial enlarged view of the picture frame portion B in fig. 7.

Fig. 9 is a schematic perspective view of a mixing tube assembly of the present invention in a second embodiment.

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

Fig. 11 is a further exploded perspective view of fig. 10.

Fig. 12 is a front view of fig. 9.

FIG. 13 is a top view of the inner tube, support ring, and air flow collar assembled together.

Fig. 14 is a top view of fig. 12.

Fig. 15 is a schematic cross-sectional view taken along line C-C of fig. 14.

Fig. 16 is a partially enlarged view of the picture frame portion D in fig. 15.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the attached drawings, wherein features of the embodiments may be combined with each other without conflict if several embodiments exist. When the description refers to the accompanying drawings, the same numbers or symbols in different drawings indicate the same or similar elements unless otherwise indicated. What is described in the following exemplary embodiments does not represent all embodiments of the invention, but rather is merely an example of a product consistent with the invention as set forth in the claims of the invention.

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

Referring to fig. 1-8, a first embodiment of the present invention discloses a mixing tube assembly 100 for use in an exhaust gas aftertreatment device to enhance the mixing effect of exhaust gas and urea particles. The mixing tube assembly 100 comprises an inner tube 1, an outer tube 2 at least partially sleeved over the inner tube 1, an annular space 3 between the inner tube 1 and the outer tube 2, a collar 6 secured in the outer tube 2, and a support ring 4 mounted on the inner tube 1 to secure the inner tube 1 in the outer tube 2. The support ring 4 is located in the annular space 3.

The inner tube 1 comprises an open-pore tube 11 and a swirl tube 12 connected with the open-pore tube 11. In the illustrated embodiment of the present invention, the perforated pipe 11 and the cyclone pipe 12 are two separate components, and the cyclone pipe 12 is fixed to one end of the perforated pipe 11.

In the illustrated embodiment of the present invention, the perforated tube 11 includes a first perforated portion 111 and a second perforated portion 112. The first opening 111 is provided with a plurality of circular holes 1111, and the second opening 112 is provided with a plurality of elongated holes 1121.

In the illustrated embodiment of the present invention, in order to further fix the perforated tube 11, the perforated tube 11 further includes a plurality of first mounting claws 113 at one end of the perforated tube 11 and a plurality of second mounting claws 114 at the other end of the perforated tube 11, and the plurality of first mounting claws 113 and the plurality of second mounting claws 114 are welded and fixed to the inner wall of the outer tube 2. As will be appreciated by those skilled in the art, since the tube diameter of the outer tube 2 is larger than the tube diameter of the inner tube 1, the first plurality of mounting claws 113 and the second plurality of mounting claws 114 must be expanded outwardly in the radial direction of the perforated tube 11 by a certain dimension to reach or be close to the inner wall of the outer tube 2.

The cyclone tube 12 includes a first tube body 121, a second tube body 122, and a conical tube 123 connected between the first tube body 121 and the second tube body 122. The mixing tube assembly 100 includes an end cap 124 secured in the first tube body 121 and a urea nozzle mount 125 secured to the end cap 124. The urea nozzle mount 125 is used for mounting a urea nozzle for spraying atomized urea droplets into the inner tube 1. The second pipe body 122 is at least partially inserted into the perforated pipe 11 and is welded to the perforated pipe 11. The conical tube 123 is provided with a plurality of swirl vanes 1231 and an air flow inlet 1232 corresponding to each swirl vane 1231. The airflow passing through the airflow inlet 1232 can form a rotational flow under the guidance of the swirl plates 1231, so that urea droplets can be better wrapped, and the risk of urea crystallization can be reduced.

The outer tube 2 comprises a first end 21 and a second end 22 opposite to the first end 21, wherein the first end 21 is provided with a mounting portion 211 protruding outwards along the radial direction of the outer tube 2, and the mounting portion 211 is used for mounting the outer tube 2 on other parts of an exhaust gas aftertreatment device. In the illustrated embodiment of the invention, the mounting portion 211 is a flange of the first end 21.

The collar 6 is fixed to the first end 21, and the collar 6 protrudes from the first end 21 in a direction away from the second end 22. The collar 6 surrounds the outer circumference of the swirl plates 1231 and forms an air flow gap 60 with the swirl plates 1231, and the air flow gap 60 communicates with the air flow inlet 1232. The swirl plates 1231 protrude from the collar 6 at least partially in the axial direction of the inner tube 1. In the illustrated embodiment of the invention, the collar 6 is at least partially inserted into the outer tube 2 in the axial direction of the outer tube 2, and the collar 6 is welded to the outer tube 2.

The collar 6 is provided with a number of first relief grooves 61 corresponding to the number of first mounting claws 113. The outer tube 2 is provided with a plurality of first plug welding holes 231 corresponding to the plurality of first mounting claws 113 so as to externally weld the plurality of first mounting claws 113. The outer tube 2 is provided with a plurality of second plug welding holes 232 corresponding to the plurality of second mounting claws 114 to facilitate welding the plurality of second mounting claws 114 from the outside. Furthermore, the outer tube 2 is provided with a number of third plug welding holes 233 corresponding to the support ring 4 to facilitate welding of the support ring 4 from the outside.

As shown in fig. 7 and 8, it will be understood by those skilled in the art that when the air flows toward the inner tube 1, a portion of the air flow before reaching the collar 6 passes through the air flow inlet 1232 under the guidance of the swirl vanes 1231 to enter the inner tube 1 in a swirl shape; a portion of the airflow reaching the collar 6 passes through the airflow inlet 1232 under the restriction of the collar 6 to increase the strength of the swirling flow; a portion of the gas flow passes through the annular space 3 to keep the inner tube 1 warm, reducing the risk of urea crystallization; a portion of the air flow entering the annular space 3 passes through the circular holes 1111 and/or the elongated holes 1121 of the perforated tube 11 into the inner tube 1; of course, a small amount of air flow is also possible through the circular holes 1111 and/or the elongated holes 1121 in the perforated tube 11 from the inner tube 1 into the annular space 3.

The present invention, by providing the collar 6, functionally enables extension of the outer tube 2, thereby better forcing air flow through the air flow inlet 1232 into the inner tube 1 in a swirling flow, which is advantageous for enhancing swirling flow, compared to the prior art.

Referring to fig. 9 to 16, a mixing tube assembly 100 according to a second embodiment of the present invention is similar to the mixing tube assembly 100 according to the first embodiment, and the main difference between the two is that the mixing tube assembly 100 according to the second embodiment of the present invention is further provided with an air flow retainer 5 mounted on the perforated tube 11, and several first mounting claws 113 are omitted. The air flow retainer 5 is located in the annular space 3 adjacent to the second tubular body 122, the air flow retainer 5 being located in the annular space 3 to prevent air flow through the annular space 3. At this time, most of the air flowing toward the inner tube 1 can pass through the air inlet 1232 only to enter the inner tube 1 in a swirling shape. A small amount of the air flow entering the inner tube 1 may then pass through the circular holes 1111 and/or the elongated holes 1121 in the perforated tube 11 into the annular space 3 and further downstream. The mixing tube assembly 100 of the second embodiment of the present invention is advantageous in further enhancing swirl flow by providing the air flow baffle 5 as compared to the first embodiment.

The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and it should be understood that the present invention should be based on those skilled in the art, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present invention without departing from the spirit and scope of the present invention and modifications thereof should be covered by the scope of the claims of the present invention.

Claims

1. A mixing tube assembly comprising an inner tube, an outer tube at least partially sleeved over the inner tube, and an annular space between the inner tube and the outer tube, characterized in that: the inner tube comprises an open-pore tube and a cyclone tube fixed with one end of the open-pore tube, and the cyclone tube is provided with a plurality of cyclone sheets and an airflow inlet corresponding to each cyclone sheet; the outer tube comprises a first end part and a second end part opposite to the first end part, wherein the first end part is provided with a mounting part protruding outwards along the radial direction of the outer tube, and the mounting part is used for mounting the outer tube on other parts of the exhaust gas aftertreatment device; the mixing pipe assembly further comprises a collar fixed to the first end, the collar protrudes out of the first end in a direction away from the second end, the collar surrounds the peripheries of the swirl plates and forms air flow gaps with the swirl plates, and the air flow gaps are communicated with the air flow inlet; the swirl plates at least partially protrude out of the lantern ring along the axial direction of the inner tube.

2. The mixing tube assembly of claim 1, wherein: the collar is at least partially inserted into the outer tube along the axial direction of the outer tube, and the collar is welded and fixed with the outer tube.

3. The mixing tube assembly of claim 1, wherein: the mounting part is a flanging of the first end part.

4. The mixing tube assembly of claim 1, wherein: the cyclone tube comprises a first tube body, a second tube body and a conical tube connected between the first tube body and the second tube body, and the cyclone sheets and the airflow inlet are arranged on the conical tube.

5. The mixing tube assembly of claim 4, wherein: the mixing tube assembly comprises an end cover fixed in the first tube body and a urea nozzle mounting seat fixed on the end cover; the second pipe body is at least partially inserted into the perforated pipe and welded and fixed with the perforated pipe.

6. The mixing tube assembly of claim 1, wherein: the perforated pipe is provided with a plurality of first mounting claws positioned at one end of the perforated pipe and a plurality of second mounting claws positioned at the other end of the perforated pipe, and the plurality of first mounting claws and the plurality of second mounting claws are welded and fixed on the inner wall of the outer pipe.

7. The mixing tube assembly of claim 6, wherein: the lantern ring is provided with a plurality of first abdication grooves corresponding to the plurality of first mounting claws, and the outer tube is provided with a plurality of first plug welding holes corresponding to the plurality of first mounting claws so as to be convenient for welding from outside.

8. The mixing tube assembly of claim 6, wherein: the outer tube is provided with a plurality of second plug welding holes corresponding to the plurality of second mounting claws so as to facilitate welding from the outside.

9. The mixing tube assembly of claim 1, wherein: the mixing tube assembly further includes a support ring mounted on the open-cell tube to secure the inner tube in the outer tube, the support ring being located in the annular space.

10. The mixing tube assembly of claim 4, wherein: the mixing tube assembly further includes an air flow retainer mounted on the open-cell tube, the air flow retainer being adjacent the second tube body, the air flow retainer being positioned in the annular space to inhibit air flow through the annular space.