CN211082028U - Mixer and selective catalytic reduction system comprising same - Google Patents
Mixer and selective catalytic reduction system comprising same Download PDFInfo
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- CN211082028U CN211082028U CN201922012724.9U CN201922012724U CN211082028U CN 211082028 U CN211082028 U CN 211082028U CN 201922012724 U CN201922012724 U CN 201922012724U CN 211082028 U CN211082028 U CN 211082028U
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Abstract
The utility model provides a mixer and selective catalytic reduction system comprising the same, the mixer comprises a first end cover component, a second end cover component, a nozzle component, a mixing pipe component and a connecting pipe, the nozzle component is arranged on the side end face of the first end cover component and penetrates into the first end cover component to be connected with the inlet end of the mixing pipe component; the outlet end of the mixing pipe assembly penetrates out of the first end cover assembly and is in butt joint with the inlet end of the connecting pipe, the inlet end of the connecting pipe is located outside the side portion of the second end cover assembly, the side portion of the second end cover assembly penetrates into the second end cover assembly and is installed in the second end cover assembly, and the outlet end of the mixing pipe assembly is fixedly connected with the butt joint of the inlet end of the connecting pipe through the flange assembly. The utility model discloses can adopt the flexonics, adapt to different aftertreatment system framework, can not increase extra backpressure. The mixing performance is good, the deposition formation is prevented, the connection is flexible, and the device can adapt to different space requirements and post-processing system arrangement.
Description
Technical Field
The utility model relates to an automobile field, in particular to blender reaches selective catalytic reduction system including it.
Background
Selective Catalytic Reduction (SCR) refers to the use of a reducing agent (e.g., ammonia, liquid ammonia, urea) to "selectively" react with NO in the exhaust gas in the presence of a catalystxReacting and generating nontoxic and pollution-free N2And H2O。
In the automotive field, Selective Catalytic Reduction (SCR) is a chemical process that converts nitrogen oxides (NOx) into nitrogen and water. A process for converting harmful NOx emissions in diesel engine exhaust to harmless nitrogen and water by adding automotive grade urea (referred to as diesel exhaust fluid DEF).
Conventionally, the uniformity of the ammonia concentration distribution within the exhaust system has a significant impact on aftertreatment system efficiency. Uneven distribution of urea droplets may reduce the NOx conversion efficiency of the SCR system and increase the risk of urea crystallization and system plugging of the exhaust system under extreme conditions.
In addition, selective catalytic reduction systems are increasingly required to be flexible and compact in profile to accommodate different system arrangements.
In view of the above, those skilled in the art have developed the structure of a selective catalytic reduction system in an attempt to overcome the above-mentioned technical problems.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a blender and including its selective catalytic reduction system in order to overcome among the prior art defect and the single installation form that form crystallization and jam easily among automobile exhaust system and the mixing device.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a mixer is characterized by comprising a first end cover assembly, a second end cover assembly, a nozzle assembly, a mixing pipe assembly and a connecting pipe, wherein the first end cover assembly and the second end cover assembly are of a cavity structure with an opening at the lower part, and the nozzle assembly is installed on the side end surface of the first end cover assembly and penetrates into the first end cover assembly to be connected with the inlet end of the mixing pipe assembly;
the outlet end of the mixing pipe assembly penetrates out of the first end cover assembly and is in butt joint with the inlet end of the connecting pipe, the inlet end of the connecting pipe is located outside the side portion of the second end cover assembly, the outlet end of the connecting pipe penetrates into the second end cover assembly from the side portion of the second end cover assembly and is installed in the second end cover assembly, and the outlet end of the mixing pipe assembly is fixedly connected with the butt joint of the inlet end of the connecting pipe through a flange assembly.
According to an embodiment of the present invention, the mixing tube assembly comprises a mixing tube, a tapered portion and a flow guiding device, the mixing tube is tapered, the top of the taper is an inlet end of the mixing tube, and the bottom is an outlet end of the mixing tube;
the flow guide device is of a hollow block structure, a central hole is formed in the center of the end face of the flow guide device, and a plurality of flow guide holes and a plurality of flow distribution channels are formed in the end face of the flow guide device;
the mixing pipe and the flow guide device are positioned in the first end cover assembly, the inlet end of the mixing pipe is connected with the nozzle assembly, and the outlet end of the mixing pipe is connected with the central hole of the flow guide device;
the tapered portion is located outside the first end cap assembly, and an inlet end of the tapered portion is connected with an outlet of the first end cap assembly.
According to the utility model discloses an embodiment, guiding device's terminal surface four sides are outwards extended respectively and are turned over a formation turn-ups.
According to the utility model discloses an embodiment, the reposition of redundant personnel passageway with the water conservancy diversion hole is located respectively the both sides of centre bore.
According to the utility model discloses an embodiment, the downthehole water conservancy diversion piece that is provided with of water conservancy diversion.
According to the utility model discloses an embodiment, a plurality of whirl entries have been seted up on the pipe wall of hybrid tube, whirl entrance is provided with the spinning disk.
According to the utility model discloses an embodiment, the whirl entry encircles the pipe wall setting of hybrid tube, the spinning disk is followed the marginal inwardly extending protrusion of whirl entry.
According to the utility model discloses an embodiment, the blender still includes the spoiler, the spoiler is installed in the cavity structure of first end cap subassembly, be located the hybrid tube with under the guiding device.
According to the utility model discloses an embodiment, the shape of spoiler is semi-circular, just be equipped with the crease or the recess of indent on the spoiler.
According to an embodiment of the present invention, the connecting pipe is a straight pipe or an elbow pipe.
According to an embodiment of the present invention, the connecting pipe is a divergent pipe.
According to an embodiment of the invention, the diverging pipe forms a smooth transition through a smooth and diverging cross section.
According to the utility model discloses an embodiment, the divergent pipe is including connecting integrative fixed cross section and variable cross section, fixed cross section is located the entry end department of divergent pipe, variable cross section is located the exit end department of divergent pipe.
According to the utility model discloses an embodiment, the variable cross section is the divergent section, the shape of divergent section is the linear type, or the curvilinear figure.
According to the utility model discloses an embodiment, be provided with the trompil on the pipe wall of divergent section.
According to the utility model discloses an embodiment, the mouth of pipe terminal surface of divergent section is perpendicular to the central axis of divergent section.
According to an embodiment of the present invention, the pipe orifice end surface of the diverging section is a chamfer.
According to an embodiment of the invention, the cross-section of the diverging section is circular, oval, rounded rectangle or a combination of circular and oval.
According to the utility model discloses an embodiment, the flange subassembly includes first flange and second flange, first flange mounting is in the exit end of mixing tube subassembly, the second flange mounting is in the entry end of connecting pipe, the exit end of mixing tube subassembly with connect through flexonics spare between the entry end of connecting pipe, just flexonics spare passes through flange joint first flange with between the second flange.
According to an embodiment of the present invention, the flexible connecting member is a long straight pipe or a bent pipe.
The utility model also provides a selective catalytic reduction system, its characterized in that, selective catalytic reduction system includes as above the blender.
The utility model discloses an actively advance the effect and lie in:
the utility model discloses blender and selective catalytic reduction system including it, wherein the blender comprises two independent parts, and every part is all compacter, can adopt the flexonics to adapt to different aftertreatment system framework, and can not increase extra backpressure. The mixer has good mixing performance, deposition formation resistance and flexible connection, and can adapt to different space requirements and post-processing system architectures.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:
fig. 1 is a front view of a first embodiment of the mixer of the present invention.
Fig. 2 is an exploded view of a first embodiment of the mixer of the present invention.
Fig. 3 is an assembly diagram of the mixing tube and the flow guiding device in the first embodiment of the mixer of the present invention.
Fig. 4 is an assembly diagram of a connection pipe in the first embodiment of the mixer of the present invention.
Fig. 5 is a first schematic view illustrating the assembly of the connecting pipe and the second end cap assembly according to the first embodiment of the mixer of the present invention.
Fig. 6 is a second schematic view illustrating the assembly of the connecting pipe and the second end cap assembly in the first embodiment of the mixer of the present invention.
Fig. 7 is a perspective view of a second embodiment of the mixer of the present invention.
Fig. 8 is a top view of a second embodiment of the mixer of the present invention.
Fig. 9 is a bottom view of a second embodiment of the mixer of the present invention.
Fig. 10 is an exploded view of a second embodiment of the mixer of the present invention.
Fig. 11 is an assembly diagram of the connecting pipe and the second end cap assembly in the second embodiment of the mixer of the present invention.
Fig. 12 is an assembled top view of a connecting tube and a second end cap assembly in a second embodiment of the mixer of the present invention.
Fig. 13 is a cross-sectional view taken along line a-a of fig. 12.
Fig. 14 is a cross-sectional view taken along line C-C of fig. 12.
Fig. 15 is a schematic structural view of a divergent tube in the second embodiment of the mixer of the present invention.
Fig. 16 is a schematic view showing the installation of the flexible connecting member in the mixer of the present invention.
Fig. 17 is a second schematic view of the installation of the flexible connector in the mixer of the present invention.
[ reference numerals ]
First end cap assembly 10
Second end cap assembly 11
Mixing tube assembly 30
Connecting pipe 40
Mixing tube 32
Big flange of side of giving vent to anger 14
Flow guiding device 34
Flow-splitting channel 343
Detailed Description
To make the above objects, features and advantages of the present invention more comprehensible, the following description is taken in conjunction with the accompanying drawings
The present invention will be described in detail with reference to the accompanying drawings.
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.
Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.
The first embodiment is as follows:
fig. 1 is a front view of a first embodiment of the mixer of the present invention. Fig. 2 is an exploded view of a first embodiment of the mixer of the present invention. Fig. 3 is an assembly diagram of the mixing tube and the flow guiding device in the first embodiment of the mixer of the present invention. Fig. 4 is an assembly diagram of a connection pipe in the first embodiment of the mixer of the present invention.
As shown in fig. 1 to 4, the present embodiment discloses a mixer including a first end cap assembly 10, a second end cap assembly 11, a nozzle assembly 20, a mixing tube assembly 30, and a connection tube 40. Wherein, the first and second end cap assemblies 10 and 11 are of a cavity structure with an open lower portion, and the nozzle assembly 20 is mounted on the side end surface of the first end cap assembly 10 and penetrates into the first end cap assembly 10 to be connected with the inlet end of the mixing tube assembly 30. The outlet end of the mixing tube assembly 30 penetrates through the first end cap assembly 10 and is abutted with the inlet end of the connecting tube 40, the inlet end of the connecting tube 40 is positioned outside the side part of the second end cap assembly 11, the outlet end of the connecting tube 40 penetrates into the second end cap assembly 11 from the side part of the second end cap assembly 11 and is installed in the second end cap assembly 11, and the abutting part of the outlet end of the mixing tube assembly 30 and the inlet end of the connecting tube 40 is fixedly connected through a flange assembly.
Preferably, the mixing tube assembly 30 in this embodiment comprises a mixing tube 32, a conical portion 33 and a flow guide 34, the mixing tube 32 preferably being conical, the top of the cone being an inlet end 321 of the mixing tube 32 and the bottom being an outlet end 322 of the mixing tube 32. The flow guide 34 is preferably a hollow block-shaped structure. The central position of the end surface of the flow guiding device 34 is provided with a central hole 341, and the end surface of the flow guiding device 34 is provided with a plurality of flow guiding holes 342 and a plurality of flow dividing channels 343. The mixing tube 32 and the deflector 34 are positioned within the first end cap assembly 10, with the inlet end 321 of the mixing tube 32 connected to the nozzle assembly 20 and the outlet end 322 of the mixing tube 32 connected to the central bore 341 of the deflector 34. The tapered portion 33 is located outside the first end cap assembly 10, and an inlet end of the tapered portion 33 is connected to an outlet of the first end cap assembly 10.
Specifically, in the present embodiment, the deflector 34 may be configured to extend and fold from four sides of the end surface to form flanges 344. As shown in fig. 3, for example, the deflector 34 forms a hollow ladder-like structure. The flow dividing channel 343 and the flow guiding hole 342 are respectively located at both sides of the central hole 341. The flow guide holes 342 may be provided therein with flow guide fins 345 to enhance the flow guide effect. To further secure the deflector 34, a bracket 346 may be mounted on the flap 344 and secured within the cavity structure of the intake side end cap assembly 10 by the bracket 346, thereby effectively securing the deflector 34 and stabilizing the position of the mixing tube assembly 30.
Specifically, a plurality of swirl inlets 323 are opened in the wall of the mixing pipe 32, and swirl vanes 324 are provided at the swirl inlets 323. The swirl inlet 323 is preferably disposed around the wall of the mixing tube 32 and the vanes 324 extend inwardly and project along the edge of the swirl inlet 323 to increase the swirling action and accelerate the turbulent gas flow.
In addition, the mixer may further preferably include a spoiler 50, and the spoiler 50 is installed in the cavity structure of the first head assembly 11 directly below the mixing pipe 32 and the deflector 34. As shown in fig. 2, the shape of the spoiler 50 in this embodiment matches the shape of the inside of the first end cap assembly 10 and the shape of the mixing tube assembly 30. Preferably, the shape of the spoiler 50 is semicircular in this embodiment, and the spoiler 50 is provided with an inwardly concave crease 51 or groove to help to channel the air flow.
In particular, here the longer semicircular edge of the spoiler 50 corresponds to the projection of the flow guiding device 34, e.g. the flow guiding device 34 is trapezoidal, the longer semicircular edge of the spoiler 50 corresponds to the trapezoidal projection of the flow guiding device 34, thereby ensuring that the spoiler 50 can effectively shield the mixing tube assembly 30.
In the present embodiment, the nozzle assembly 20 includes a nozzle 21 (e.g., a urea nozzle) and a nozzle holder 22, the nozzle holder 22 being mounted on an upper end surface of the first end cap assembly 10, the nozzle 21 penetrating the nozzle holder 22 and being in abutment with the inlet end 321 of the mixing pipe 32.
Further, the flange assembly comprises a first flange 60, a gasket 61 and a second flange 62, the first flange 60, the gasket 61 and the second flange 62 are sequentially overlapped and sleeved at the butt joint of the conical part 33 and one end of the connecting pipe 40 and are fixed through a screw 63 and a nut 64, the outlet end 322 of the mixing pipe 32 is connected with the conical part 33, and therefore the mixing pipe 32, the flow guide device 34, the conical part 33 and the connecting pipe 40 are fixedly connected, and the relative position of the mixer is controlled.
Fig. 16 is a schematic view showing the installation of the flexible connecting member in the mixer of the present invention. Fig. 17 is a second schematic view of the installation of the flexible connector in the mixer of the present invention.
As shown in fig. 16 and 17, in addition to the above structure, when the first end cap assembly 10 and the second end cap assembly 11 are far apart from each other, the flexible connecting member 80 may be added to connect the two. Specifically, the first flange 60 is installed at the outlet end of the mixing tube assembly 30 in the first end cap assembly 10, the second flange 62 is installed at the inlet end of the connection tube 40 of the second end cap assembly 11, the outlet end of the mixing tube assembly 30 and the inlet end of the connection tube 40 are connected by the flexible connection member 80, and the flexible connection member 80 is flanged between the first flange 60 and the second flange 62. The flexible connection 80 herein may preferably be a long straight tube or a bent tube.
Of course, the specific shape of the flexible connecting element 80 is not limited to the above examples, and the shape can be adjusted according to actual needs. Flexible connection 80 is an optional component of the mixer and may be adapted for use in any particular application to meet the needs of the system layout.
Fig. 5 is a first schematic view illustrating the assembly of the connecting pipe and the second end cap assembly according to the first embodiment of the mixer of the present invention. Fig. 6 is a second schematic view illustrating the assembly of the connecting pipe and the second end cap assembly in the first embodiment of the mixer of the present invention.
As shown in fig. 5 and 6, the connecting pipe 40 may preferably be a straight pipe or a bent pipe here in order to achieve different swirling effects. As shown in fig. 5, the connection pipe 40 is a straight pipe, the straight pipe penetrates into the second end cap assembly 11, and when the air flow flows into the second end cap assembly 11 and touches the inner wall of the second end cap assembly 11, the air flow rotates clockwise along the inner wall to form a vortex-shaped air flow, thereby achieving a good mixing effect.
As shown in fig. 6, the elbow may include a straight pipe section 41 and an elbow section 42, the elbow section 42 is located within the second endcap assembly 11, and the curvature of the elbow section 42 preferably matches the curvature of the inner wall surface of the second endcap assembly 11. Thus, when the air flow enters the bent pipe section 42 from the straight pipe section 41, the air flow will rotate along the inner wall surface of the second end cover assembly 11, so as to form a swirl-shaped air flow, thereby achieving a better mixing effect.
The utility model also provides a selective catalytic reduction system, it includes as above the blender, the first end cap subassembly 10 of blender is connected with diesel particulate filter through the big flange 13 of side of admitting air, the second end cap subassembly 11 of blender is connected with the selective catalytic reduction device through the big flange 14 of side of giving vent to anger, and the external urea case of nozzle assembly 20 to form a complete selective catalytic reduction system.
When the selective catalytic reduction system works, urea in a urea box (not shown) is sprayed into the mixing component 30 through the nozzle 21, waste gas containing nitrogen and oxygen compounds is upwards discharged into the first end cover component 10 after being filtered by a diesel particulate filter (not shown), enters the mixing component 30, is mixed with the urea and sprayed into the second end cover component 11, forms vortex-shaped airflow through the second end cover component 11, and enters the selective catalytic reduction device after further full mixing reaction, so that a mixture of nitrogen and water without toxicity and pollution is obtained.
Example two:
fig. 7 is a perspective view of a second embodiment of the mixer of the present invention. Fig. 8 is a top view of a second embodiment of the mixer of the present invention. Fig. 9 is a bottom view of a second embodiment of the mixer of the present invention. Fig. 10 is an exploded view of a second embodiment of the mixer of the present invention.
As shown in fig. 7 to 10, the present embodiment discloses a mixer including a first end cap assembly 10, a second end cap assembly 11, a nozzle assembly 20, a mixing tube assembly 30, and a connection tube 40. Wherein, the first and second end cap assemblies 10 and 11 are of a cavity structure with an open lower portion, and the nozzle assembly 20 is mounted on the side end surface of the first end cap assembly 10 and penetrates into the first end cap assembly 10 to be connected with the inlet end of the mixing tube assembly 30. The outlet end of the mixing tube assembly 30 penetrates through the first end cap assembly 10 and is abutted with the inlet end of the connecting tube 40, the inlet end of the connecting tube 40 is positioned outside the side part of the second end cap assembly 11, the outlet end of the connecting tube 40 penetrates into the second end cap assembly 11 from the side part of the second end cap assembly 11 and is installed in the second end cap assembly 11, and the abutting part of the outlet end of the mixing tube assembly 30 and the inlet end of the connecting tube 40 is fixedly connected through a flange assembly.
Preferably, as shown in fig. 3, the mixing tube assembly 30 in this embodiment comprises a mixing tube 32, a tapered portion 33 and a flow guide 34, the mixing tube 32 preferably being tapered, the top of the taper being an inlet end 321 of the mixing tube 32 and the bottom being an outlet end 322 of the mixing tube 32. The flow guide 34 is preferably a hollow block-shaped structure. The central position of the end surface of the flow guiding device 34 is provided with a central hole 341, and the end surface of the flow guiding device 34 is provided with a plurality of flow guiding holes 342 and a plurality of flow dividing channels 343. The mixing tube 32 and the deflector 34 are positioned within the first end cap assembly 10, with the inlet end 321 of the mixing tube 32 connected to the nozzle assembly 20 and the outlet end 322 of the mixing tube 32 connected to the central bore 341 of the deflector 34. The tapered portion 33 is located outside the first end cap assembly 10, and an inlet end of the tapered portion 33 is connected to an outlet of the first end cap assembly 10.
Specifically, in the present embodiment, the deflector 34 may be configured to extend and fold from four sides of the end surface to form flanges 344. As shown in fig. 3, for example, the deflector 34 forms a hollow ladder-like structure. The flow dividing channel 343 and the flow guiding hole 342 are respectively located at both sides of the central hole 341. The flow guide holes 342 may be provided therein with flow guide fins 345 to enhance the flow guide effect. To further secure the deflector 34, a bracket 346 may be mounted on the flap 344 and secured within the cavity structure of the intake side end cap assembly 10 by the bracket 346, thereby effectively securing the deflector 34 and stabilizing the position of the mixing tube assembly 30.
Specifically, a plurality of swirl inlets 323 are opened in the wall of the mixing pipe 32, and swirl vanes 324 are provided at the swirl inlets 323. The swirl inlet 323 is preferably disposed around the wall of the mixing tube 32 and the vanes 324 extend inwardly and project along the edge of the swirl inlet 323 to increase the swirling action and accelerate the turbulent gas flow.
In addition, the mixer may further preferably include a spoiler 50, and the spoiler 50 is installed in the cavity structure of the first head assembly 11 directly below the mixing pipe 32 and the deflector 34. As shown in fig. 2, the shape of the spoiler 50 in this embodiment matches the shape of the inside of the first end cap assembly 10 and the shape of the mixing tube assembly 30. Preferably, the shape of the spoiler 50 is semicircular in this embodiment, and the spoiler 50 is provided with an inwardly concave crease 51 or groove to help to channel the air flow.
In particular, here the longer semicircular edge of the spoiler 50 corresponds to the projection of the flow guiding device 34, e.g. the flow guiding device 34 is trapezoidal, the longer semicircular edge of the spoiler 50 corresponds to the trapezoidal projection of the flow guiding device 34, thereby ensuring that the spoiler 50 can effectively shield the mixing tube assembly 30.
In the present embodiment, the nozzle assembly 20 includes a nozzle 21 (e.g., a urea nozzle) and a nozzle holder 22, the nozzle holder 22 being mounted on an upper end surface of the first end cap assembly 10, the nozzle 21 penetrating the nozzle holder 22 and being in abutment with the inlet end 321 of the mixing pipe 32.
Further, the flange assembly comprises a first flange 60, a gasket 61 and a second flange 62, the first flange 60, the gasket 61 and the second flange 62 are sequentially overlapped and sleeved at the butt joint of the conical part 33 and one end of the connecting pipe 40 and are fixed through a screw 63 and a nut 64, the outlet end 322 of the mixing pipe 32 is connected with the conical part 33, and therefore the mixing pipe 32, the flow guide device 34, the conical part 33 and the connecting pipe 40 are fixedly connected, and the relative position of the mixer is controlled.
Fig. 16 is a schematic view showing the installation of the flexible connecting member in the mixer of the present invention. Fig. 17 is a second schematic view of the installation of the flexible connector in the mixer of the present invention.
As shown in fig. 16 and 17, in addition to the above structure, when the first end cap assembly 10 and the second end cap assembly 11 are far apart from each other, the flexible connecting member 80 may be added to connect the two. Specifically, the first flange 60 is installed at the outlet end of the mixing tube assembly 30 in the first end cap assembly 10, the second flange 62 is installed at the inlet end of the connection tube 40 of the second end cap assembly 11, the outlet end of the mixing tube assembly 30 and the inlet end of the connection tube 40 are connected by the flexible connection member 80, and the flexible connection member 80 is flanged between the first flange 60 and the second flange 62. The flexible connection 80 herein may preferably be a long straight tube or a bent tube.
Of course, the specific shape of the flexible connecting element 80 is not limited to the above examples, and the shape can be adjusted according to actual needs. Flexible connection 80 is an optional component of the mixer and may be adapted for use in any particular application to meet the needs of the system layout.
Fig. 11 is an assembly diagram of the connecting pipe and the second end cap assembly in the second embodiment of the mixer of the present invention. Fig. 12 is an assembled top view of a connecting tube and a second end cap assembly in a second embodiment of the mixer of the present invention. Fig. 13 is a cross-sectional view taken along line a-a of fig. 12. Fig. 14 is a cross-sectional view taken along line C-C of fig. 12. Fig. 15 is a schematic structural view of a divergent tube in the second embodiment of the mixer of the present invention.
As shown in fig. 11 to fig. 15, the main differences between the present embodiment and the first embodiment are: in the present embodiment, the connection pipe 40 is formed of an expander 70. The connection of the flared tube 70 may take various forms such as a clamp, a weld, a flange, etc. In the embodiment shown, the inlet end 71 of the divergent pipe 70 is connected to the second flange 62, and the bottom end of the second end cap assembly 11 is connected to the large outlet side flange 14. Here, the flange connection is only an example, and the connection manner of the diverging pipe 70 may be changed without being limited thereto.
Preferably, the diverging tube 70 is passed through a smooth and diverging cross section to form a smooth transition. Therefore, the air flow backflow near the pipe orifice caused by the sharp and sudden change of the flow passage section can be reduced, and the purpose of reducing the back pressure is achieved.
In this embodiment, the diverging tube 70 preferably comprises a fixed section 72 and a variable section 73 integrally connected such that the fixed section 72 is located at the inlet end 71 of the diverging tube 70 and the variable section 73 is located at the outlet end 74 of the diverging tube 70.
In particular, the section 73 is here a divergent section, the shape of which is rectilinear, or curvilinear. The curvature of the curve can be adjusted according to the space of arrangement, and the shape of the curve is optimized to reduce the back pressure as much as possible.
Further, the pipe wall of the divergent section is provided with an opening, or the pipe wall of the divergent section does not need to be provided with an opening, and the setting and the adjustment are carried out according to the actual situation.
Still further, the nozzle end face of the diverging section may preferably be arranged perpendicular to the central axis of the diverging section. Alternatively, the end surface of the pipe orifice of the diverging section may be chamfered.
Here, the cross section of the diverging section is circular, elliptical, or rounded rectangular. Alternatively, the cross-section of the diverging section may be provided as a combination of a circle and an ellipse, such as a combination of a circular tube and an elliptical diverging tube.
For circumferentially rotating gas flow through the tube, the flared tube may keep the gas flow as close as possible to the tube wall to reduce gas backflow and additional backpressure losses.
In the mixer in the embodiment, a conventional straight pipe (constant section) is replaced by a divergent pipe (variable section) so as to effectively reduce the back pressure. Meanwhile, the same performance can be achieved under the condition that the original appearance is kept unchanged.
The utility model also provides a selective catalytic reduction system, it includes as above the blender, the first end cap subassembly 10 of blender is connected with diesel particulate filter through the big flange 13 of side of admitting air, the second end cap subassembly 11 of blender is connected with the selective catalytic reduction device through the big flange 14 of side of giving vent to anger, and the external urea case of nozzle assembly 20 to form a complete selective catalytic reduction system.
When the selective catalytic reduction system works, urea in a urea box (not shown) is sprayed into the mixing component 30 through the nozzle 21, waste gas containing nitrogen and oxygen compounds is upwards discharged into the first end cover component 10 after being filtered by a diesel particulate filter (not shown), enters the mixing component 30, is mixed with the urea and sprayed into the second end cover component 11, forms vortex-shaped airflow through the second end cover component 11, and enters the selective catalytic reduction device after further full mixing reaction, so that a mixture of nitrogen and water without toxicity and pollution is obtained.
As can be seen from the above description, the specific structure of the spoiler 50 in the above embodiments can be commonly used in different embodiments, the connecting pipe 40 can be a straight pipe, a bent pipe or a divergent pipe, and the wall of the connecting pipe 40 can be provided with a plurality of through holes or smooth pipes, and the connecting pipe can be fixed in the second end cap assembly 11 through the bracket 43, and is commonly used in different embodiments.
Of course, the above embodiments are only examples, and the various components of the mixer of the present invention, such as the mixing tube, the tapered portion, the spoiler, the connecting tube, the flow guiding device, etc., can be transformed into equivalent structures on the basis of the above embodiments, and all of them are based on the same concept, achieve the same function, and all belong to the protection scope of the present invention.
To sum up, the utility model discloses the mixer reaches selective catalytic reduction system including it, wherein the mixer comprises two independent parts, and every part is all compacter, can adopt the flexonics to adapt to different aftertreatment system framework, and can not increase extra backpressure. The mixer has good mixing performance, deposition formation resistance and flexible connection, and can adapt to different space requirements and post-processing system architectures.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.
Claims (21)
1. A mixer is characterized by comprising a first end cover assembly, a second end cover assembly, a nozzle assembly, a mixing pipe assembly and a connecting pipe, wherein the first end cover assembly and the second end cover assembly are of a cavity structure with an opening at the lower part, the nozzle assembly is installed on the side end face of the first end cover assembly and penetrates into the first end cover assembly to be connected with the inlet end of the mixing pipe assembly;
the outlet end of the mixing pipe assembly penetrates out of the first end cover assembly and is in butt joint with the inlet end of the connecting pipe, the inlet end of the connecting pipe is located outside the side portion of the second end cover assembly, the outlet end of the connecting pipe penetrates into the second end cover assembly from the side portion of the second end cover assembly and is installed in the second end cover assembly, and the outlet end of the mixing pipe assembly is fixedly connected with the butt joint of the inlet end of the connecting pipe through a flange assembly.
2. The mixer of claim 1, wherein the mixing tube assembly comprises a mixing tube, a tapered portion, and a deflector, the mixing tube being tapered, the top of the taper being an inlet end of the mixing tube and the bottom being an outlet end of the mixing tube;
the flow guide device is of a hollow block structure, a central hole is formed in the center of the end face of the flow guide device, and a plurality of flow guide holes and a plurality of flow distribution channels are formed in the end face of the flow guide device;
the mixing pipe and the flow guide device are positioned in the first end cover assembly, the inlet end of the mixing pipe is connected with the nozzle assembly, and the outlet end of the mixing pipe is connected with the central hole of the flow guide device;
the tapered portion is located outside the first end cap assembly, and an inlet end of the tapered portion is connected with an outlet of the first end cap assembly.
3. The mixer of claim 2 wherein the four sides of the end face of the deflector each extend outwardly to form a flange.
4. The mixer of claim 2 wherein the diverter channel and the diverter aperture are located on opposite sides of the central aperture.
5. The mixer of claim 2 wherein the deflector holes have deflector vanes disposed therein.
6. The mixer of claim 2, wherein the wall of the mixing tube defines a plurality of swirl inlets, and the swirl inlets are provided with swirl plates.
7. The mixer of claim 6, wherein the swirl inlet is disposed around a wall of the mixing tube, and the swirl vanes extend inwardly and project along an edge of the swirl inlet.
8. The mixer of claim 2 further comprising a baffle mounted within the cavity structure of the first end cap assembly directly below the mixing tube and the deflector.
9. The mixer of claim 8 wherein said baffles are semi-circular in shape and are provided with inwardly concave folds or grooves.
10. The mixer of claim 1, wherein the connecting tube is a straight tube or an elbow tube.
11. The mixer of claim 1, wherein the connecting tube is an expanding tube.
12. The mixer of claim 11, wherein said diverging tube forms a smooth transition through a smooth and diverging cross-section.
13. The mixer of claim 11, wherein the involute comprises a fixed section and a variable section that are integrally connected, the fixed section being located at the inlet end of the involute and the variable section being located at the outlet end of the involute.
14. The mixer of claim 13, wherein said variable cross-section is a diverging section, said diverging section being linear or curvilinear in shape.
15. The mixer of claim 14, wherein the walls of said diverging section are provided with openings.
16. The mixer of claim 14, wherein the orifice end face of the diverging section is perpendicular to the central axis of the diverging section.
17. The mixer of claim 14 wherein the end surface of the diverging section is chamfered.
18. The mixer of claim 14, wherein the cross-section of the diverging section is circular, elliptical, rounded rectangular, or a combination of circular and elliptical.
19. The mixer of claim 1, wherein the flange assembly includes a first flange and a second flange, the first flange being mounted at the outlet end of the mixing tube assembly, the second flange being mounted at the inlet end of the connecting tube, the outlet end of the mixing tube assembly and the inlet end of the connecting tube being connected by a flexible connector, and the flexible connector being flanged between the first flange and the second flange.
20. A mixer according to claim 19, wherein the flexible connection is an elongate straight or curved tube.
21. A selective catalytic reduction system, characterized in that it comprises a mixer according to any of claims 1-20.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921235117 | 2019-08-01 | ||
| CN2019212351172 | 2019-08-01 |
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| Publication Number | Publication Date |
|---|---|
| CN211082028U true CN211082028U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922012724.9U Active CN211082028U (en) | 2019-08-01 | 2019-11-20 | Mixer and selective catalytic reduction system comprising same |
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| CN (1) | CN211082028U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11828214B2 (en) | 2020-05-08 | 2023-11-28 | Cummins Emission Solutions Inc. | Configurable aftertreatment systems including a housing |
| US11891937B2 (en) | 2018-07-03 | 2024-02-06 | Cummins Emission Solutions Inc. | Body mixing decomposition reactor |
-
2019
- 2019-11-20 CN CN201922012724.9U patent/CN211082028U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11891937B2 (en) | 2018-07-03 | 2024-02-06 | Cummins Emission Solutions Inc. | Body mixing decomposition reactor |
| US11828214B2 (en) | 2020-05-08 | 2023-11-28 | Cummins Emission Solutions Inc. | Configurable aftertreatment systems including a housing |
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