CN216811842U - Aftertreatment mixer and engine - Google Patents
Aftertreatment mixer and engine Download PDFInfo
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- CN216811842U CN216811842U CN202122656437.9U CN202122656437U CN216811842U CN 216811842 U CN216811842 U CN 216811842U CN 202122656437 U CN202122656437 U CN 202122656437U CN 216811842 U CN216811842 U CN 216811842U
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Abstract
The utility model belongs to the technical field of engines, and discloses an aftertreatment mixer and an engine, wherein the aftertreatment mixer comprises an outer layer pipe, a urea nozzle, an inner layer pipe and an electric heating device, wherein two ends of the outer layer pipe are respectively provided with a first mounting hole and a second mounting hole, and the outer layer pipe is provided with a first air inlet; the urea nozzle is arranged in the second mounting hole; the inner layer pipe penetrates through the first mounting hole, extends into the inner layer pipe, the second end of the inner layer pipe is close to the urea nozzle, the inner layer pipe and the outer layer pipe are spaced, and a plurality of second air inlet holes are formed in the inner layer pipe; the electric heating device is arranged in the air inlet cavity. This aftertreatment blender heats waste gas through electric heater unit under low temperature operational environment, improves the temperature and improves urea crystallization problem, and waste gas mixes with the urea spraying along the hoop of urea injection department moreover, can improve the homogeneity of mixing, and the tight coupling design of commonality of this aftertreatment blender can regard as a part of modularized design in addition, and the commonality is strong.
Description
Technical Field
The utility model belongs to the technical field of engines, particularly relates to an aftertreatment mixer, and further relates to an engine.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The existing SCR air inlet mixing structure consists of a cyclone tube, a cyclone tube clapboard, a flow guide tube and an outer layer tube. After the exhaust flow enters the cyclone tube, NH3 formed by mixing and decomposing urea and the exhaust flow is unevenly distributed in the mixer under the influence of the cyclone gas. And the honeycomb duct effect is not good, and the NH3 concentration of the mixed gas flowing to the two SCR paths is uneven under the action of the honeycomb duct. And the urea is easy to crystallize, and the urea decomposition rate is slow at low exhaust temperature, so that the after-treatment emission is influenced. In addition, tightly coupled post-processing modular designs are not suitable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to at least solve the problems of poor mixing effect and poor mixing uniformity of a post-treatment mixer and easy crystallization of urea in the prior art, and the aim is realized by the following technical scheme:
a first aspect of the utility model provides an aftertreatment mixer comprising:
the outer-layer pipe is provided with a first mounting hole and a second mounting hole at two ends respectively, and a first air inlet hole is formed in the circumferential direction of the outer-layer pipe;
a urea nozzle mounted to the second mounting hole;
the inner layer pipe penetrates through the first mounting hole, a first end of the inner layer pipe extends into the outer layer pipe, a second end of the inner layer pipe is arranged close to the urea nozzle, an air inlet cavity is formed between the inner layer pipe and the outer layer pipe, and a plurality of second air inlet holes are formed in the circumferential direction of the inner layer pipe;
the electric heating device is arranged in the air inlet cavity and is positioned between the first air inlet hole and the second air inlet hole.
The post-treatment mixer provided by the utility model can heat the waste gas in a low-temperature working environment by arranging the electric heating device, so that the temperature is increased, the urea crystallization problem is improved, the waste gas is mixed with urea spray along the annular direction of the urea spraying position, the mixing uniformity can be improved, and in addition, the post-treatment mixer is in a universal tight coupling design, can be used as a part of a modular design, and has strong universality.
In addition, the aftertreatment mixer according to the utility model may also have the following additional features:
in some embodiments of the present invention, the inner pipe includes a rotational flow taper pipe and an air outlet pipe, one end of the rotational flow taper pipe is connected to a first end of the air outlet pipe, the other end of the rotational flow taper pipe is disposed near the second mounting hole, and the air outlet pipe is inserted into the first mounting hole.
In some embodiments of the utility model, the aftertreatment mixer further comprises a perforated tube disposed inside the outlet duct.
In some embodiments of the present invention, the porous pipe includes two diameter-variable portions and a connecting portion located between the two diameter-variable portions, the diameter-variable portions are in a truncated cone shape, small-diameter ends of the two diameter-variable portions are respectively connected to two end portions of the connecting portion, and the porous pipe is provided with a plurality of vent holes.
In some embodiments of the present invention, the swirling taper pipe includes a taper pipe body and a plurality of flow deflectors, the taper pipe body is in a truncated cone shape, a large diameter end of the taper pipe body is connected to the air outlet pipe, the taper pipe body is circumferentially provided with a plurality of second air inlet holes, the second air inlet holes are axially arranged along the taper pipe body, the flow deflectors are arranged in one-to-one correspondence with the second air inlet holes, and one end of each flow deflector is connected to the taper pipe body.
In some embodiments of the present invention, the electric heating device includes an electric heating element and an electric connector, the electric heating element is disposed inside the air inlet cavity along the circumferential direction of the inner pipe, the electric heating element is provided with a plurality of air passing channels, the air inlet cavity on both sides of the electric heating element is communicated through the air passing channels, one end of the electric connector is electrically connected with the electric heating element, and the other end of the electric connector is used for connecting an external power supply.
In some embodiments of the utility model, the aftertreatment mixer further comprises an intake pipe, the intake pipe penetrating the first intake hole.
In some embodiments of the present invention, the aftertreatment mixer further includes a flow equalizing plate disposed inside the air intake chamber along a circumferential direction of the inner pipe, the flow equalizing plate having a plurality of through holes, the flow equalizing plate being disposed between the first air intake hole and the electric heating device.
In some embodiments of the present invention, the outer layer tube includes an outer layer tube body, an air inlet end cap and an air outlet end cap, the first mounting hole is disposed on the air outlet end cap, the second mounting hole is disposed on the air inlet end cap, and the air inlet end cap and the air outlet end cap are respectively connected to two axial ends of the outer layer tube body.
A second aspect of the utility model provides an engine having an aftertreatment mixer as set out in the first aspect of the utility model.
The engine according to the second aspect of the present invention has the same advantages as the aftertreatment mixer according to the first aspect of the present invention, and will not be described in detail herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a cross-sectional schematic view of an aftertreatment mixer in accordance with an embodiment of the utility model;
FIG. 2 schematically illustrates a structural schematic of a perforated tube of an aftertreatment mixer according to an embodiment of the utility model;
fig. 3 schematically shows a structural schematic of a swirl cone of an aftertreatment mixer according to an embodiment of the utility model.
FIG. 4 schematically shows a structural schematic of an outer tube of an aftertreatment mixer according to an embodiment of the utility model.
Fig. 5 schematically shows a structural view of an electric heating device of an aftertreatment mixer according to an embodiment of the utility model.
Fig. 6 schematically shows a schematic construction of an inlet pipe of an aftertreatment mixer according to an embodiment of the utility model.
FIG. 7 schematically illustrates a schematic structural view of a flow equalization plate of an aftertreatment mixer according to an embodiment of the utility model;
FIG. 8 schematically illustrates a schematic configuration of a urea nozzle of an aftertreatment mixer, according to an embodiment of the utility model;
FIG. 9 schematically illustrates a structural schematic of a nozzle base of an aftertreatment mixer in accordance with an embodiment of the utility model.
The reference symbols in the drawings denote the following:
10: outer layer tube body, 11: urea nozzle, 12: electric heater, 13: electrical terminal, 14: gas passing passage, 15: first mounting hole, 16: second mounting hole, 17: first intake holes, 18: second intake ports, 19: taper pipe body, 20: flow deflector, 21: outlet duct, 22: perforated pipe, 23: diameter-variable portion, 24: connecting part, 25: vent hole, 26: intake pipe, 27: flow equalizing plate, 28: through hole, 29: intake end cover, 30: end cover, 31: a nozzle base.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, an element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "inner", "side", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 9, a first aspect of the present invention provides an aftertreatment mixer, including an outer pipe, a urea nozzle 11, an inner pipe and an electric heater, wherein two ends of the outer pipe are respectively provided with a first mounting hole 15 and a second mounting hole 16, and the outer pipe is provided with a first air inlet 17; the urea nozzle 11 is mounted in the second mounting hole 16; the inner layer pipe penetrates through the first mounting hole 15, the first end of the inner layer pipe extends into the inner layer pipe, the second end of the inner layer pipe is arranged close to the urea nozzle 11, an air inlet cavity is formed between the inner layer pipe and the outer layer pipe, and a plurality of second air inlet holes 18 are formed in the inner layer pipe; the electric heating device is arranged in the air inlet cavity and is positioned between the first air inlet hole 17 and the second air inlet hole 18.
The outer layer pipe and the inner layer pipe are straight pipe type structures, and may be circular pipes or square pipes. The inner layer pipe and the outer layer pipe are spaced for introducing air from the circumferential direction into the inner layer pipe to be mixed with urea spray sprayed from the urea nozzle 11, and the mixing uniformity is high. For this purpose, a plurality of second air intake holes 18 may be provided along the circumferential direction of the urea nozzle 11. The principle of the electric heating device is to energize an electric heating material by an external power source to heat the exhaust gas nearby. The urea nozzle 11 may be mounted on the second mounting hole 16 through a nozzle mount 31.
The post-treatment mixer provided by the utility model can heat the waste gas in a low-temperature working environment by arranging the electric heating device, so that the temperature is increased, the urea crystallization problem is improved, the waste gas is mixed with urea spray along the annular direction of the urea spraying position, the mixing uniformity can be improved, and in addition, the post-treatment mixer is in a universal tight coupling design, can be used as a part of a modular design, and has strong universality.
In some embodiments of the present invention, the inner tube includes a swirling conical tube and an air outlet tube 21, one end of the swirling conical tube is connected to a first end of the air outlet tube 21, the other end of the swirling conical tube is disposed near the second mounting hole 16, and the air outlet tube 21 is disposed through the first mounting hole 15. The mixed gas of urea and waste gas generates rotational flow through arranging the rotational flow taper pipe to enhance the mixing effect and uniformity.
In some embodiments of the utility model, the aftertreatment mixer further comprises a perforated tube 22, the perforated tube 22 being disposed inside the outlet tube 21. The mixing uniformity is improved by arranging the perforated pipe 22 to ensure that the mixed cyclone generated by the cyclone cone pipe flows through the perforated pipe 22 to enhance mixing.
In some embodiments of the present invention, the porous pipe 22 includes two diameter-variable portions 23 and a connecting portion 24, the diameter-variable portions 23 are in a truncated cone shape, the small diameter ends of the two diameter-variable portions 23 are respectively connected to two end portions of the connecting portion 24, the porous pipe 22 is provided with a plurality of vent holes 25, and the diameter-variable structure of the porous pipe 22 enables the mixed gas to be guided in multiple angles and positions, so that the mixed gas is mixed again, and the mixing uniformity is enhanced.
In some embodiments of the present invention, the swirling conical pipe includes a conical pipe body 19 and a plurality of flow deflectors 20, the conical pipe body 19 is of a truncated cone structure, a large diameter end of the conical pipe body 19 is connected with an air outlet pipe 21, the conical pipe body 19 is circumferentially provided with a plurality of second air inlet holes 18, the second air inlet holes 18 are axially arranged along the conical pipe body 19, the flow deflectors 20 and the second air inlet holes 18 are arranged in a one-to-one correspondence, one end of each flow deflector 20 is connected with the conical pipe body 19, and a mixed gas of urea and exhaust gas can be acted by the swirling conical pipe to generate swirling flow to enhance mixing.
In some embodiments of the present invention, the electric heating device includes an electric heating element 12 and an electric connector 13, the electric heating element 12 is disposed inside the air intake cavity along the circumferential direction of the inner pipe, the electric heating element 12 is provided with a plurality of air passing ducts 14, the air passing ducts 14 are disposed near the circumferential periphery of the electric heating element 12, the air intake cavities on both sides of the electric heating element 12 are communicated through the air passing ducts 14, one end of the electric connector 13 is electrically connected with the electric heating element 12, and the other end of the electric connector 13 is connected with an external power supply, so that the exhaust gas is heated by the electric heating device, the reaction rate of the exhaust gas and urea is increased, and the mixing efficiency is further increased.
In some embodiments of the present invention, the aftertreatment mixer further includes an air inlet pipe 26, the air inlet pipe 26 is inserted into the air inlet hole, the aftertreatment mixer is conveniently connected to an external pipeline by the air inlet pipe 26, and the air inlet pipe 26 may be provided with an annular protrusion for being clamped with an external connection pipe.
In some embodiments of the present invention, the aftertreatment mixer further includes a flow-equalizing plate 27, the flow-equalizing plate 27 is disposed inside the air intake cavity along the circumference of the inner pipe, a plurality of through holes 28 are disposed on the flow-equalizing plate 27, the flow-equalizing plate 27 is disposed between the air intake and the electric heating device, the flow-equalizing plate 27 is disposed to guide the exhaust gas, and the through holes 28 can be disposed corresponding to the air passage 14 of the electric heating device, so that the exhaust gas is uniformly distributed.
In some embodiments of the present invention, the outer layer tube includes an outer layer tube body 10, a gas inlet end cap 29 and a gas outlet end cap 30, the first mounting hole 15 is disposed on the gas outlet end cap 30, the second mounting hole 16 is disposed on the gas inlet end cap 29, the gas inlet end cap 29 and the gas outlet end cap 30 are respectively connected to two axial ends of the outer layer tube body 10, and the detachable structure of the outer layer tube facilitates assembly, disassembly and maintenance.
A second aspect of the utility model provides an engine having an aftertreatment mixer as set out in the first aspect of the utility model.
The engine according to the second aspect of the present invention has the same advantageous effects as the aftertreatment mixer according to the first aspect of the present invention, and the details thereof will not be described herein.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An aftertreatment mixer, comprising:
the outer-layer pipe is provided with a first mounting hole and a second mounting hole at two ends respectively, and a first air inlet hole is formed in the circumferential direction of the outer-layer pipe;
a urea nozzle mounted to the second mounting hole;
the inner layer pipe penetrates through the first mounting hole, a first end of the inner layer pipe extends into the outer layer pipe, a second end of the inner layer pipe is arranged close to the urea nozzle, an air inlet cavity is formed between the inner layer pipe and the outer layer pipe, and a plurality of second air inlet holes are formed in the circumferential direction of the inner layer pipe;
the electric heating device is arranged in the air inlet cavity and is positioned between the first air inlet hole and the second air inlet hole.
2. The aftertreatment mixer of claim 1, wherein the inner pipe comprises a swirl cone and an outlet pipe, one end of the swirl cone is connected to a first end of the outlet pipe, the other end of the swirl cone is disposed adjacent to the second mounting hole, and the outlet pipe is disposed through the first mounting hole.
3. The aftertreatment mixer of claim 2, further comprising a perforated tube disposed inside the outlet tube.
4. The aftertreatment mixer of claim 3, wherein the perforated tube includes two tapered portions and a connecting portion between the two tapered portions, the tapered portions are frustoconical, small-diameter ends of the two tapered portions are connected to two end portions of the connecting portion, respectively, and the perforated tube is provided with a plurality of vent holes.
5. The aftertreatment mixer of claim 2, wherein the swirl cone comprises a cone body and a plurality of baffles, the cone body is in a truncated cone shape, the large-diameter end of the cone body is connected with the outlet pipe, the cone body is circumferentially provided with a plurality of second air inlet holes, the second air inlet holes are axially arranged along the cone body, the baffles and the second air inlet holes are arranged in a one-to-one correspondence, and one end of each baffle is connected with the cone body.
6. The aftertreatment mixer of claim 1, wherein the electrical heating device comprises an electrical heating element and an electrical connector, the electrical heating element is disposed inside the air intake chamber along the circumferential direction of the inner pipe, the electrical heating element is provided with a plurality of air passages, the air intake chambers on both sides of the electrical heating element are communicated through the air passages, one end of the electrical connector is electrically connected with the electrical heating element, and the other end of the electrical connector is used for connecting an external power supply.
7. The aftertreatment mixer of claim 1, further comprising an intake pipe disposed through the first intake aperture.
8. The aftertreatment mixer of claim 6, further comprising a flow equalizing plate disposed inside the intake chamber along a circumferential direction of the inner pipe, wherein the flow equalizing plate is provided with a plurality of through holes, and the flow equalizing plate is disposed between the first intake hole and the electric heating device.
9. The aftertreatment mixer of any one of claims 1-7, wherein the outer tube comprises an outer tube body, an inlet end cap, and an outlet end cap, the first mounting hole is disposed on the outlet end cap, the second mounting hole is disposed on the inlet end cap, and the inlet end cap and the outlet end cap are respectively connected to two axial ends of the outer tube body.
10. An engine having an aftertreatment mixer according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122656437.9U CN216811842U (en) | 2021-10-29 | 2021-10-29 | Aftertreatment mixer and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122656437.9U CN216811842U (en) | 2021-10-29 | 2021-10-29 | Aftertreatment mixer and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216811842U true CN216811842U (en) | 2022-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122656437.9U Active CN216811842U (en) | 2021-10-29 | 2021-10-29 | Aftertreatment mixer and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216811842U (en) |
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2021
- 2021-10-29 CN CN202122656437.9U patent/CN216811842U/en active Active
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