CN210134989U - Intake air mixing device and diesel engine aftertreatment device - Google Patents
Intake air mixing device and diesel engine aftertreatment device Download PDFInfo
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- CN210134989U CN210134989U CN201921020305.3U CN201921020305U CN210134989U CN 210134989 U CN210134989 U CN 210134989U CN 201921020305 U CN201921020305 U CN 201921020305U CN 210134989 U CN210134989 U CN 210134989U
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Abstract
The utility model discloses an after treatment device of mixing arrangement and diesel engine admits air, wherein, the mixing arrangement that admits air includes along the intake pipe that gas flow direction set gradually, admit air front end housing, the guide plate that admits air, admission connection board and DOC casing, the both ends of admission connection board respectively with admit air front end housing and DOC casing fixed connection, be equipped with the first gas water conservancy diversion hole that the confession gas passes through on the admission connection board. In the air inlet mixing device that this application provided, through the connecting plate that admits air, and set up first gas water conservancy diversion hole on the connecting plate that admits air for the air current finally can be more even entering DOC unit, has improved aftertreatment device's working property effectively.
Description
Technical Field
The utility model relates to an engine installation technical field that admits air, in particular to mixing arrangement that admits air. The utility model discloses still relate to the aftertreatment device of the diesel engine including above-mentioned mixing arrangement that admits air.
Background
In a diesel box aftertreatment system, the aftertreatment device needs to meet environmental emission requirements. The structure in which the exhaust gas and the urea solution are mixed is called a mixing device. The urea liquid drops are finally converted into ammonia gas through a series of physical and chemical reactions in the device, and the uniformly mixed gas generates catalytic reduction reaction in the carrier.
The gas enters the gas inlet mixing device through the inlet of the gas inlet pipe and enters the DOC unit through the gas outlet of the DOC shell, and the gas inlet cavity of the gas inlet mixing device is a cylindrical passage.
However, in the inlet mixing device, a plurality of media are introduced into the inlet at the same time, the flow rates of the media may be different, and the gases cannot be effectively mixed, so that the working performance of the aftertreatment device is reduced.
Therefore, how to improve the working performance of the post-processing device is a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an air inlet mixing device to improve aftertreatment device's working property. Another object of the present invention is to provide an after-treatment device for a diesel engine, comprising the above air intake mixing device.
In order to achieve the above object, the utility model provides an air inlet mixing device, include along the intake pipe that gaseous flow direction set gradually, admit air the front end housing, admit air guide plate, admit air connecting plate and DOC casing, admit air the connecting plate both ends respectively with admit air the front end housing with DOC casing fixed connection, be equipped with the first gas water conservancy diversion hole that supplies gas to pass through on the connecting plate that admits air.
Preferably, the connecting plate that admits air is for following the arc that the air inlet border of DOC casing set up, first gas water conservancy diversion hole is a plurality of, first gas water conservancy diversion hole is followed the connecting plate arc direction of admitting air arranges in proper order, first gas water conservancy diversion hole gas flow to with the gas flow direction contained angle of the air inlet of intake pipe is a, wherein, 0 < a < 180.
Preferably, the air inlet connecting plate is welded on the DOC shell and the air inlet front end cover, and a welding hole corresponding to the welding position of the air inlet connecting plate is formed in the air inlet front end cover.
Preferably, the welding holes are multiple, and the welding holes are sequentially arranged along the arc-shaped direction of the connecting position of the air inlet connecting plate.
Preferably, the air inlet blocking cover is fixedly connected with the air inlet front end cover, an air inlet cavity is formed between the air inlet blocking cover and the air inlet front end cover, and the air inlet guide plate and the air inlet connecting plate are located in the air inlet cavity.
Preferably, the guide plate that admits air is the L template, the guide plate that admits air is streamlined plate structure, the guide plate that admits air includes water conservancy diversion portion and installation department, be equipped with the gaseous water conservancy diversion hole of second in the water conservancy diversion portion, the gaseous water conservancy diversion hole of second is the multirow setting, installation department fixed connection be in admit air on mixing arrangement's the shell.
Preferably, the water conservancy diversion portion with be equipped with the strengthening rib between the installation department, the guide plate that admits air is the integrated into one piece structure.
Preferably, the air inlet structure further comprises an air inlet reinforcing plate, two ends of the air inlet reinforcing plate are fixedly connected with the air inlet pipe and the air inlet front end cover respectively, and the air outlet end of the air inlet pipe is connected with the air inlet front end cover in a sealing mode.
Preferably, the air inlet reinforcing plate is an annular hole expanding pipe sleeved on the outer side of the air inlet pipe, and the hole expanding end of the annular hole pipe is fixedly connected with the outer surface of the air inlet front end cover.
The post-treatment device of the diesel engine comprises an air inlet mixing device, a DOC unit, a DPF unit, a mixing unit, an SCR unit and an air outlet pipe which are sequentially arranged along the air flow direction, wherein the air inlet mixing device is any one of the air inlet mixing devices.
In the technical scheme, the utility model provides an air inlet mixing device includes along the intake pipe that the gas flow direction set gradually, admit air front end housing, the guide plate that admits air, admission connecting plate and DOC casing, the both ends of admission connecting plate respectively with admit air front end housing and DOC casing fixed connection, be equipped with the first gas water conservancy diversion hole that the confession gas passes through on the admission connecting plate. When the aftertreatment device is assembled, the air inlet mixing device is installed at the inlet of the DOC unit, when the air inlet mixing device works, air enters through the air inlet pipe, then enters into the cavity of the air inlet front end cover, passes through the position of the air inlet flow guide plate, then passes through the first air flow guide hole in the air inlet connecting plate, and then enters into the DOC unit through the DOC shell.
According to the air inlet mixing device, the first air guide holes are formed in the air inlet connecting plate, so that air flow can finally uniformly enter the DOC unit, and the working performance of the aftertreatment device is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intake air mixing device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the intake air mixing device of FIG. 1 taken along the direction A-A;
fig. 3 is an exploded view of an intake air mixing device according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an intake air reinforcing plate according to an embodiment of the present invention;
fig. 5 is a schematic structural view of an air inlet front end cover according to an embodiment of the present invention;
fig. 6 is a schematic structural view of an intake air deflector provided in an embodiment of the present invention;
fig. 7 is a schematic structural view of an air inlet connection plate according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an aftertreatment device according to an embodiment of the invention.
Wherein in FIGS. 1-8:
1. an air inlet flange;
2. an air inlet pipe;
3. an intake air reinforcement plate;
4. an air inlet front end cover; 4-1, welding holes;
5. an intake air deflector; 5-1, second gas diversion holes; 5-2, reinforcing ribs;
6. an air inlet connecting plate; 6-1, first gas diversion holes;
7. a DOC housing;
8. an air inlet blocking cover;
9. an intake air mixing device;
10. a DOC unit;
11. a DPF unit;
12. a mixing unit;
13. an SCR unit;
14. and an air outlet pipe.
Detailed Description
The core of the utility model is to provide an air inlet mixing device to improve the working performance of the post-treatment device. Another object of the present invention is to provide an after-treatment device for a diesel engine, comprising the above air intake mixing device.
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
Please refer to fig. 1 to 8.
In a specific embodiment, the utility model discloses the mixing arrangement that admits air that concrete embodiment provided includes intake pipe 2, the front end housing 4 that admits air, the guide plate 5 that admits air, the connecting plate 6 that admits air and DOC casing 7 that set gradually along the gas flow direction, and is concrete, for the ease of admitting air, preferred, intake pipe 2 is cylindrical straight tube structure, for the ease of intake pipe 2 is connected with external parts, intake pipe 2's the fixed connection of inlet end has air inlet flange 1.
As shown in fig. 2 and 7, two ends of the air inlet connecting plate 6 are respectively and fixedly connected with the air inlet front end cover 4 and the DOC shell 7, the air inlet connecting plate 6 is provided with a first gas guiding hole 6-1 for air to pass through, and for convenience of processing, preferably, the first gas guiding hole 6-1 is a circular hole structure. Specifically, the air inlet connecting plate 6 is an arc-shaped plate arranged along the edge of an air inlet of the DOC shell 7, the number of the first air flow guide holes 6-1 is multiple, and the first air flow guide holes 6-1 are sequentially arranged along the arc-shaped direction of the air inlet connecting plate 6. Preferably, the gas flow direction of the first gas guiding holes 6-1 and the gas flow direction of the gas inlet pipe 2 form an angle a, wherein 0 ° < a <180 °, specifically, 45 ° < a <145 °.
In order to prolong the service life of the air inlet mixing device 9, preferably, the air inlet connecting plate 6 is welded on the DOC shell 7 and the air inlet front end cover 4, and the air inlet front end cover 4 is provided with a welding hole 4-1 corresponding to the welding position of the air inlet connecting plate 6.
Preferably, the number of the welding holes 4-1 is multiple, and the welding holes 4-1 are sequentially arranged along the arc direction of the connecting position of the air inlet connecting plate 6. The air inlet front end cover 4 is usually a thin plate with a large structure, the weak part of the end face of the air inlet front end cover 4 has a cracking risk under the impact of airflow, and a welding small hole is formed in the plane of the air inlet front end cover 4. The air inlet connecting plate 6 is welded at the welding small holes of the DOC shell 7 and the air inlet front end cover 4, the structural design reduces the vibration of the air inlet front end cover 4, reduces the stress at the end face of the air inlet front end cover 4, and reduces the cracking risk of the air inlet front end cover 4.
As shown in fig. 3, in order to improve the intake air mixing uniformity, the intake pipe 2, the intake baffle 5, and the intake connecting plate 6 are preferably arranged in a staggered manner. Specifically, the intake baffle 5 and the intake connecting plate 6 may be located at the same height. The air inlet pipe 2 is positioned above the air inlet guide plate 5 and the air inlet connecting plate 6.
When the aftertreatment device is assembled, the air inlet mixing device 9 is installed at the inlet of the DOC unit 10, when the air inlet mixing device 9 works, air enters through the air inlet pipe 2, then enters into the cavity of the air inlet front end cover 4, passes through the position of the air inlet guide plate 5, then passes through the first air guide hole 6-1 on the air inlet connecting plate 6, and then enters into the DOC unit 10 through the DOC shell 7.
As can be seen from the above description, in the air intake mixing device provided in the embodiment of the present application, through the air intake connecting plate 6, and the first air guiding holes 6-1 are formed in the air intake connecting plate 6, the first air guiding holes 6-1 are designed to have a row of holes with a proper size, so as to guide the air flow, so that the air flow can finally and uniformly enter the DOC unit 10, and the working performance of the post-processing device is effectively improved.
In a specific implementation mode, the intake mixing device further comprises an intake blocking cover 8, the intake blocking cover 8 is fixedly connected with the intake front end cover 4, an intake cavity is formed between the intake blocking cover 8 and the intake front end cover 4, and the intake guide plate 5 and the intake connecting plate 6 are both located in the intake cavity.
Preferably, the air inlet guide plate 5 is an L-shaped plate, the air inlet guide plate 5 is a streamline plate structure, the air inlet guide plate 5 comprises a guide part and an installation part, the guide part is provided with a second air guide hole 5-1, and the installation part is fixedly connected to the shell of the air inlet mixing device 9. Of course, the inlet guide plate 5 may be a structure provided with a gas guide groove, and the gas enters the inlet connection plate 6 through the guide groove. The air inlet guide plate 5 is of an oblique L-shaped streamline baffle structure, and a plurality of rows of holes with proper sizes are formed in the middle of the baffle structure.
Specifically, the second gas flow guide holes 5-1 are arranged in multiple rows, and specifically, preferably, the second gas flow guide holes 5-1 are arranged in six rows, so that the gas flow is guided, and the uniformity of gas mixing at the front end of the DOC unit 10 is improved. The streamline design structure of the air inlet guide plate 5. The design of the air inlet guide plate 5 and the air flow with the opening structure on the air inlet connecting plate 6 also play a role in guiding, so that the air flow finally can uniformly enter the DOC carrier, and the mixing uniformity of the air flow on the front end surface of the DOC can be greatly improved.
Preferably, a plurality of reinforcing ribs 5-2 are arranged between the flow guide part and the installation part, the air inlet flow guide plate 5 is of an integrally formed structure, and particularly, the plurality of reinforcing ribs 5-2 are uniformly distributed along the arc-shaped direction of the flow guide part.
On the basis of the above schemes, preferably, the intake mixing device further includes an intake reinforcing plate 3, two ends of which are respectively fixedly connected with the intake pipe 2 and the intake front end cover 4, and the air outlet end of the intake pipe 2 is hermetically connected with the intake front end cover 4. Wherein the air inlet reinforcing plate 3 is welded on the air inlet pipe 2 and the air inlet front end cover 4, and the structural design can reduce the vibration of the air inlet straight pipe section caused by the whole vehicle pipeline, thereby greatly reducing the cracking risk of the air inlet straight pipe. The design of the air inlet reinforcing plate 3 reduces the vibration of the air inlet straight pipe section caused by the vibration of the whole vehicle pipeline, and reduces the cracking risk of the air inlet straight pipe.
In order to avoid stress concentration, preferably, the air inlet reinforcing plate 3 is an annular hole expanding pipe sleeved outside the air inlet pipe 2, and a flared end of the annular hole pipe is fixedly connected with the outer surface of the air inlet front end cover 4.
The application provides a post-processing apparatus of diesel engine, includes along the gas flow direction mixing arrangement 9 that admits air, DOC unit 10, DPF unit 11, mixing unit 12, SCR unit 13 and outlet duct 14 that set gradually, admit air mixing arrangement 9 and be any kind of above-mentioned mixing arrangement 9 that admits air. The foregoing describes a specific structure of the intake air mixing device 9, and the present application includes the intake air mixing device 9, which also has the above technical effects.
Specifically, the engine tail gas enters the post-treatment through the air inlet of the air inlet mixing device 9, flows through the DOC unit 10, the DPF unit 11, the mixer unit and the two SCR units 13 in sequence, and finally flows out of the post-treatment device through the air outlet pipe 14, and the flow path of the gas flow is shown by an arrow in fig. 8.
Wherein doc (diesel Oxidation catalyst): oxidation catalytic technology, DOC unit is a device that converts carbon monoxide (CO) and Hydrocarbons (HC) in the engine exhaust into harmless water (H20) and carbon dioxide (CO 2). The application of the catalyst in Euro VI/national VI emission treatment mainly has the main functions of oxidizing Nitric Oxide (NO) in the exhaust gas into nitrogen dioxide (NO2) and accelerating the conversion rate and efficiency of nitrogen oxide (NOx) in the subsequent SCR; and oxidizing fuel injected during DPF regeneration to raise the temperature, so as to prepare for DPF regeneration in the early stage.
DPF (diesel Particulate Filter): a diesel particulate trap and a DPF unit are devices which realize particulate trapping by means of alternately plugging the inlet and the outlet of carrier pores of the trap to force airflow to pass through a porous wall surface. The emission pollutants such as PM2.5 in the exhaust gas are effectively reduced. When ash is trapped too much, fuel injection is required for DPF regeneration.
SCR (Selective Catalytic reduction) technology: selective catalytic reduction, SCR unit is a device for eliminating nitrogen oxides in diesel engine tail gas by utilizing ammonia gas and NOx to perform catalytic reduction reaction.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
Claims (10)
1. The utility model provides an intake mixing arrangement, its characterized in that includes intake pipe (2), the front end housing (4) that admits air, the guide plate (5) of admitting air, the connecting plate (6) and DOC casing (7) that set gradually along the gas flow direction, the both ends of admitting air connecting plate (6) respectively with admit air front end housing (4) with DOC casing (7) fixed connection, be equipped with first gas water conservancy diversion hole (6-1) that the confession gas passes through on the connecting plate (6) of admitting air.
2. The intake mixing device according to claim 1, wherein the intake connecting plate (6) is an arc-shaped plate disposed along the air inlet edge of the DOC casing (7), the number of the first gas guiding holes (6-1) is multiple, the first gas guiding holes (6-1) are sequentially arranged along the arc-shaped direction of the intake connecting plate (6), the gas flow direction of the first gas guiding holes (6-1) and the air inlet gas flow direction of the intake pipe (2) form an included angle a, and 0 ° < a <180 °.
3. The intake mixing device according to claim 1, wherein the intake connecting plate (6) is welded to the DOC shell (7) and the intake front end cover (4), and the intake front end cover (4) is provided with a welding hole (4-1) corresponding to the welding position of the intake connecting plate (6).
4. The intake air mixing device according to claim 3, wherein the number of the welding holes (4-1) is plural, and the plural welding holes (4-1) are arranged in sequence along an arc direction of a connecting position of the intake connecting plate (6).
5. The intake mixing device according to claim 1, further comprising an intake block cover (8) fixedly connected with the intake front end cover (4), wherein an intake cavity is formed between the intake block cover (8) and the intake front end cover (4), and the intake guide plate (5) and the intake connecting plate (6) are both located in the intake cavity.
6. The air inlet mixing device according to claim 1, wherein the air inlet guide plate (5) is an L-shaped plate, the air inlet guide plate (5) is a streamline plate structure, the air inlet guide plate (5) comprises a guide part and an installation part, the guide part is provided with second air guide holes (5-1), the second air guide holes (5-1) are arranged in multiple rows, and the installation part is fixedly connected to a shell of the air inlet mixing device.
7. The air inlet mixing device according to claim 6, characterized in that a reinforcing rib (5-2) is arranged between the flow guide part and the mounting part, and the air inlet flow guide plate (5) is of an integrally formed structure.
8. The intake air mixing device according to any one of claims 1 to 7, further comprising an intake reinforcing plate (3) having two ends respectively fixedly connected to the intake pipe (2) and the intake front end cover (4), wherein the outlet end of the intake pipe (2) is hermetically connected to the intake front end cover (4).
9. The air inlet mixing device as claimed in claim 8, wherein the air inlet reinforcing plate (3) is an annular hole expanding pipe sleeved outside the air inlet pipe (2), and a flared end of the annular hole expanding pipe is fixedly connected with the outer surface of the air inlet front end cover (4).
10. An aftertreatment device for a diesel engine, comprising an intake air mixing device (9), a DOC unit (10), a DPF unit (11), a mixing unit (12), an SCR unit (13), and an outlet pipe (14) which are sequentially arranged in a gas flow direction, wherein the intake air mixing device (9) is the intake air mixing device (9) as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921020305.3U CN210134989U (en) | 2019-06-30 | 2019-06-30 | Intake air mixing device and diesel engine aftertreatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921020305.3U CN210134989U (en) | 2019-06-30 | 2019-06-30 | Intake air mixing device and diesel engine aftertreatment device |
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| CN210134989U true CN210134989U (en) | 2020-03-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459884A (en) * | 2020-11-30 | 2021-03-09 | 郑州日产汽车有限公司 | Novel structure catalyst converter of diesel oil nation six b |
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2019
- 2019-06-30 CN CN201921020305.3U patent/CN210134989U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459884A (en) * | 2020-11-30 | 2021-03-09 | 郑州日产汽车有限公司 | Novel structure catalyst converter of diesel oil nation six b |
| CN112459884B (en) * | 2020-11-30 | 2022-02-15 | 郑州日产汽车有限公司 | Diesel oil national hexa b structure catalyst converter |
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