CN207634148U - SCR urea sprays protection system - Google Patents
SCR urea sprays protection system Download PDFInfo
- Publication number
- CN207634148U CN207634148U CN201721625140.3U CN201721625140U CN207634148U CN 207634148 U CN207634148 U CN 207634148U CN 201721625140 U CN201721625140 U CN 201721625140U CN 207634148 U CN207634148 U CN 207634148U
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- CN
- China
- Prior art keywords
- urea
- air
- pipe
- injection pipe
- exhaust pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000004202 carbamide Substances 0.000 title claims abstract description 125
- 239000007921 spray Substances 0.000 title claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 62
- 239000007924 injection Substances 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000002912 waste gas Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 210000002700 urine Anatomy 0.000 claims 2
- 238000004321 preservation Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- -1 meanwhile Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a SCR urea sprays protection system, including the blast pipe, the inside urea nozzle assembly of urea injection end insert blast pipe, be provided with annular air chamber along its inner wall on the blast pipe, one side of annular air chamber communicates with each other through inlet channel and the outside of blast pipe, the opposite side is provided with a plurality of and the inside communicating air jet orifice of blast pipe, urea nozzle assembly includes the urea injection pipe, coaxial cover establishes the air cooling pipe outside the urea injection pipe, form air passage between the inside of air cooling pipe and the outside of urea injection pipe, air cooling pipe advance, exhaust end respectively with air connector, the inside of blast pipe communicates with each other. The design not only improves the working efficiency of the SCR system while realizing the heat preservation of the waste gas, but also realizes the cooling of the urea nozzle.
Description
Technical field
The utility model belongs to automobile SCR post-processing technology fields, and in particular to a kind of SCR urea injection protection system,
Suitable for five or more the engine with SCR aftertreatment system of state, SCR post-processings can be effectively improved while realizing exhaust gas heat preservation
The service efficiency of system.
Background technology
SCR aftertreatment system has been widely used as NOx emission processing means, mainly by catalyst converter, urea box, quantitative
The compositions such as feeder unit, nozzle, sensor, compressed air cylinder, air filter.Wherein, urea box for urea liquid storage with
Supply, compressed air cylinder provide compressed air for specified rate feeder unit, and nozzle is installed in the discharge duct before catalyst converter,
It is connected with amount feeder unit by injection pipe, main function is that the urea liquid in feeding process by atomization equably sprays
Enter in engine exhaust, the ammonia for enabling urea liquid to decomposite after heated is more evenly distributed into exhaust in this way.
Chinese patent：Application publication number is CN103032136A, and data of publication of application is the patent of invention on April 10th, 2013
A kind of SCR system with external mix jet meters structure is disclosed, which includes storing urea box, the urea of reducing agent
Pump, nozzle and air source, air source are connected to nozzle pipeline, and nozzle inclination is inserted into the exhaust pipe of engine, including urea tube, air cap
And the airflow clearance being formed between urea tube and air cap, the reducing agent that air-flow and metering valve in air source eject is outside nozzle
It mixes.Although the outer mixing type nozzle is simple in structure, it is atomized good mixing effect, and whole system is easy to control, from nozzle
The aqueous solution of urea of interior ejection is susceptible to the rebuffed phenomenon of drop, causes the working efficiency of SCR system relatively low.
Invention content
The purpose of the utility model is to overcome the relatively low problems of SCR system working efficiency of the existing technology, provide one
Kind can effectively improve the SCR urea injection protection system of SCR system working efficiency.
In order to achieve the above object, the technical solution of the utility model is as follows：
A kind of SCR urea injection protection system, including exhaust pipe, urea ejection end are inserted into the urea nozzle inside exhaust pipe
Assembly；
Described its inner wall of exhaust pipe upper edge is provided with annular air chamber, and the side of the annular air chamber passes through inlet channel
It is communicated with the outside of exhaust pipe, the other side of annular air chamber is provided with multiple sprays with No.1 air that is being communicated inside exhaust pipe
Hole.
The waste gas outlet of the air jet orifices towards exhaust pipe is arranged.
The urea nozzle assembly includes urea injection pipe, the coaxial air cooled tube being set in outside urea injection pipe,
The liquid feeding end of the urea injection pipe is communicated with urea box, and the ejection end of urea injection pipe is sprayed by the multiple urea opened up thereon
Perforation is communicated with the inside of exhaust pipe；
Form air duct between the inside and the outside of urea injection pipe of the air cooled tube, air cooled tube into
Gas end, exhaust end are communicated with the inside of pneumatic fitting, exhaust pipe respectively.
The ejection end of the urea injection pipe is tapered portion, at the smaller diameter end of the tapered portion, the week of the middle part of tapered portion
Circle offers urea spray-hole；
The nearly tapered portion setting of the exhaust end, and exhaust end is uniformly provided with multiple No. two air jet orifices along its border, two
The axis of number air jet orifices is vertical with the axis of urea injection pipe.
The inlet end is communicated by being coaxially set in the air intake chamber outside urea injection pipe with pneumatic fitting, and empty
The diameter of gas inlet chamber is more than the diameter of air cooled tube, and the axis of pneumatic fitting is vertical with the axis of urea injection pipe.
Be provided on the tube wall of the exhaust pipe with the outer wall of air cooled tube be inserted into cooperation nozzle mounting base, it is described into
Gas end at the top of the nozzle fixed seat and nozzle mounting base that are arranged outside it by being fixedly connected.
The urea injection pipe is straight tube structure, and the angle formed with the tube wall of exhaust pipe is more than 90 °, and tapered portion is close
Annular air chamber is arranged.
The urea injection pipe is L-type bend pipe structure, including vertical tube connected vertically, transverse tube, the vertical tube and exhaust pipe
The angle that is formed of tube wall be 90 °, the ejection end of the transverse tube stretches into region made of annular air chamber encloses.
Compared with prior art, the beneficial effects of the utility model are：
1, its inner wall of exhaust pipe upper edge is provided with annular air in a kind of SCR urea injection protection system of the utility model
Chamber, and the side of annular air chamber is communicated by inlet channel with the outside of exhaust pipe, the other side of annular air chamber is provided with
It is multiple with the No.1 air jet orifices communicated inside exhaust pipe, when work, air first pass sequentially through inlet channel, annular air chamber,
No.1 air jet orifices enter inside exhaust pipe, are then downstream moved along exhaust inside pipe wall, which can not only slow down exhaust
The reduction of temperature plays the role of engine exhaust heat preservation, and can prevent the aqueous solution of urea drop sprayed from injector assembly
The generation for phenomenon of being rebuffed, improves the working efficiency of SCR system.Therefore, the utility model not only realizes exhaust gas heat preservation, Er Qieti
The high working efficiency of SCR system.
2, to be arranged with air cold for the outer, coaxial of urea injection pipe in a kind of SCR urea of the utility model injection protection system
But it manages, forms air duct, the inlet end of air cooled tube, row between the inside and the outside of urea injection pipe of air cooled tube
Gas end is communicated with the inside of pneumatic fitting, exhaust pipe respectively, and when work, air is followed by pneumatic fitting, air intake chamber, sky
Enter the inside of exhaust pipe behind gas channel by No. two air jet orifices, which can not only realize the cooling to urea nozzle,
But also high-temp waste gas is avoided that urea crystals plug nozzle caused by aqueous solution of urea heating in nozzle, to ensure urea
The jeting effect of aqueous solution.Therefore, the utility model, which realizes, cools down and prevents urea crystals from blocking spray urea nozzle
Mouth.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the enlarged structure schematic diagram of A in Fig. 1.
Fig. 3 is the structural schematic diagram of urea nozzle assembly in Fig. 1.
Fig. 4 is the enlarged structure schematic diagram of B in Fig. 3.
Fig. 5 is the structural schematic diagram of the utility model embodiment 2.
In figure：Exhaust pipe 1, annular air chamber 11, No.1 air jet orifices 111, inlet channel 12, waste gas outlet 13, nozzle
Mounting base 14, urea nozzle assembly 2, urea injection pipe 21, urea spray-hole 211, tapered portion 212, vertical tube 213, transverse tube 214,
Air cooled tube 22, air duct 221, inlet end 222, exhaust end 223, No. two air jet orifices 224, air intake chamber 3, air
Connector 4, nozzle fixed seat 5.
Specific implementation mode
Explanation and specific implementation mode are described in further detail the utility model below in conjunction with the accompanying drawings.
Referring to Fig. 1 to Fig. 5, a kind of SCR urea injection protection system, including exhaust pipe 1, urea ejection end are inserted into exhaust pipe
Urea nozzle assembly 2 inside 1；
Its inner wall of 1 upper edge of the exhaust pipe is provided with annular air chamber 11, the side of the annular air chamber 11 by into
Gas channel 12 is communicated with the outside of exhaust pipe 1, the other side of annular air chamber 11 be provided with it is multiple with communicated inside exhaust pipe 1
No.1 air jet orifices 111.
The waste gas outlet 13 of the air jet orifices 111 towards exhaust pipe 1 is arranged.
The urea nozzle assembly 2 is cold including urea injection pipe 21, the coaxial air being set in outside urea injection pipe 21
But the liquid feeding end of pipe 22, the urea injection pipe 21 is communicated with urea box, and the ejection end of urea injection pipe 21 by opening up thereon
Multiple urea spray-holes 211 communicated with the inside of exhaust pipe 1；
Air duct 221 is formed between the inside and the outside of urea injection pipe 21 of the air cooled tube 22, air is cold
But the inlet end 222 of pipe 22, exhaust end 223 are communicated with the inside of pneumatic fitting 4, exhaust pipe 1 respectively.
The ejection end of the urea injection pipe 21 is tapered portion 212, at the smaller diameter end of the tapered portion 212, tapered portion
212 middle part border offers urea spray-hole 211；
223 nearly tapered portion 212 of the exhaust end is arranged, and exhaust end 223 is uniformly provided with multiple No. two air along its border
Spray orifice 224, and the axis of No. two air jet orifices 224 is vertical with the axis of urea injection pipe 21.
The inlet end 222 is by being coaxially set in the air intake chamber 3 outside urea injection pipe 21 and 4 phase of pneumatic fitting
It is logical, and the diameter of air intake chamber 3 is more than the diameter of air cooled tube 22, axis and the urea injection pipe 21 of pneumatic fitting 4
Axis is vertical.
The nozzle mounting base 14 that cooperation is inserted into the outer wall of air cooled tube 22 is provided on the tube wall of the exhaust pipe 1,
The inlet end 222 is fixedly connected by the nozzle fixed seat 5 being arranged outside it with the top of nozzle mounting base 14.
The urea injection pipe 21 is straight tube structure, and the angle formed with the tube wall of exhaust pipe 1 is more than 90 °, and taper
Portion's 212 near-ring shape air chamber 11 setting.
The urea injection pipe 21 is L-type bend pipe structure, including vertical tube connected vertically 213, transverse tube 214, the vertical tube
213 angles formed with the tube wall of exhaust pipe 1 are 90 °, and the ejection end of the transverse tube 214 stretches into annular air chamber 11 and encloses
Region in.
The principles of the present invention are described as follows：
The utility model provides a kind of SCR urea injection protection system, and concrete operating principle is：
Urea nozzle assembly 2：When work, aqueous solution of urea is more via being opened up in the tapered portion 212 of urea injection pipe 21
A urea spray-hole 211 sprays into the inside of exhaust pipe 1；Meanwhile air is followed by pneumatic fitting 4, air intake chamber 3, air
Enter the inside of exhaust pipe 1 behind channel 221 by No. two air jet orifices 224, realization cools down and prevent height to urea nozzle
Warm exhaust gas is to urea crystals plug nozzle caused by aqueous solution of urea heating in nozzle.
Exhaust pipe 1：Engine exhaust enters from the exhaust gas entrance of exhaust pipe 1 inside exhaust pipe 1, is sprayed with from injector assembly
Aqueous solution of urea droplets mixing, reaction, realize processing to NOx in exhaust gas, meanwhile, air enters annular by inlet channel 12
Air chamber 11, then by No.1 air jet orifices 111 spray after along exhaust pipe 1 inner wall flow further downstream, realize exhaust insulation with
The drop of aqueous solution of urea, which is rebuffed, to be protected.
Air intake chamber 3：The diameter of air intake chamber 3 is more than the diameter of air cooled tube 22 in the utility model, this sets
Meter can provide sufficient space for air stream so that the air distribution for entering air cooled tube 22 is more uniform.
No. two air jet orifices 224：The utility model is by the axis of the axis of No. two air jet orifices 224 and urea injection pipe 21
It is arranged vertically, can prevent the urea of the air flow effects urea spray-hole 211 through No. two air jet orifices 224 from spraying.
Embodiment 1：
Referring to Fig. 1 to Fig. 4, a kind of SCR urea injection protection system, including exhaust pipe 1, urea ejection end are inserted into exhaust pipe
Urea nozzle assembly 2 inside 1, its inner wall of 1 upper edge of the exhaust pipe are provided with annular air chamber 11, the annular air chamber 11
Side communicated with the outside of exhaust pipe 1 by inlet channel 12, the other side of annular air chamber 11 be evenly arranged with it is multiple with
The waste gas outlet 13 of the No.1 air jet orifices 111 communicated inside exhaust pipe 1, the air jet orifices 111 towards exhaust pipe 1 is arranged, institute
It states urea nozzle assembly 2 and includes urea injection pipe 21, the coaxial air cooled tube 22 being set in outside urea injection pipe 21, it is described
Urea injection pipe 21 is straight tube structure, and the angle formed with the tube wall of exhaust pipe 1 is 135 °, the liquid feeding end of urea injection pipe 21
It being communicated with urea box, the ejection end of urea injection pipe 21 is tapered portion 212, and 212 near-ring shape air chamber 11 of the tapered portion is arranged,
At its smaller diameter end, middle part the urea spray-hole 211 communicated with the inside of exhaust pipe 1, the air are offered along its border
Air duct 221, the inlet end 222 of air cooled tube 22 are formed between the inside and the outside of urea injection pipe 21 of cooling tube 22
It is communicated with pneumatic fitting 4 by being coaxially set in the air intake chamber 3 outside urea injection pipe 21, the air intake chamber 3
Diameter is more than the diameter of air cooled tube 22, and the axis of pneumatic fitting 4 is vertical with the axis of urea injection pipe 21, air cooled tube
22 223 nearly tapered portion 212 of exhaust end setting, border is uniformly provided with No. two skies that multiple inside with exhaust pipe 1 communicate
The axis of gas spurt 224, No. two air jet orifices 224 is vertical with the axis of urea injection pipe 21, on the tube wall of the exhaust pipe 1
It is provided with the nozzle mounting base 14 that cooperation is inserted into the outer wall of air cooled tube 22, the inlet end 222 outside it by being arranged
Nozzle fixed seat 5 be fixedly connected with the top of nozzle mounting base 14.
Embodiment 2：
Referring to Fig. 5, structure with embodiment 1, the difference is that：
The urea injection pipe 21 is L-type bend pipe structure, including vertical tube connected vertically 213, transverse tube 214, the vertical tube
213 angles formed with the tube wall of exhaust pipe 1 are 90 °, and the ejection end of the transverse tube 214 stretches into annular air chamber 11 and encloses
Region in.
Claims (8)
1. a kind of SCR urea sprays protection system, including exhaust pipe（1）, urea ejection end be inserted into exhaust pipe（1）Internal urea
Injector assembly（2）, it is characterised in that：
The exhaust pipe（1）Its inner wall of upper edge is provided with annular air chamber（11）, the annular air chamber（11）Side pass through
Inlet channel（12）With exhaust pipe（1）Outside communicate, annular air chamber（11）The other side be provided with multiple and exhaust pipe（1）
The No.1 air jet orifices that inside communicates（111）.
2. a kind of SCR urea according to claim 1 sprays protection system, it is characterised in that：The air jet orifices
（111）Towards exhaust pipe（1）Waste gas outlet（13）Setting.
3. a kind of SCR urea according to claim 1 sprays protection system, it is characterised in that：
The urea nozzle assembly（2）Including urea injection pipe（21）, be coaxially set in urea injection pipe（21）External air
Cooling tube（22）, the urea injection pipe（21）Liquid feeding end communicated with urea box, urea injection pipe（21）Ejection end pass through
The multiple urea spray-holes opened up thereon（211）With exhaust pipe（1）Inside communicate；
The air cooled tube（22）Inside and urea injection pipe（21）Outside between form air duct（221）, air
Cooling tube（22）Inlet end（222）, exhaust end（223）Respectively with pneumatic fitting（4）, exhaust pipe（1）Inside communicate.
4. a kind of SCR urea according to claim 3 sprays protection system, it is characterised in that：
The urea injection pipe（21）Ejection end be tapered portion（212）, the tapered portion（212）Smaller diameter end at, taper
Portion（212）Middle part border offer urea spray-hole（211）；
The exhaust end（223）Nearly tapered portion（212）Setting, and exhaust end（223）It is uniformly provided with multiple No. two along its border
Air jet orifices（224）, No. two air jet orifices（224）Axis and urea injection pipe（21）Axis it is vertical.
5. a kind of SCR urea according to claim 3 sprays protection system, it is characterised in that：The inlet end（222）It is logical
It crosses and is coaxially set in urea injection pipe（21）External air intake chamber（3）With pneumatic fitting（4）It communicates, and air intake chamber
（3）Diameter be more than air cooled tube（22）Diameter, pneumatic fitting（4）Axis and urea injection pipe（21）Axis hang down
Directly.
6. a kind of SCR urea according to claim 3 sprays protection system, it is characterised in that：The exhaust pipe（1）Pipe
It is provided on wall and air cooled tube（22）Outer wall be inserted into cooperation nozzle mounting base（14）, the inlet end（222）Pass through
The nozzle fixed seat being arranged outside it（5）With nozzle mounting base（14）Top be fixedly connected.
7. a kind of SCR urea according to any one of claim 4 ﹣ 6 sprays protection system, it is characterised in that：The urine
Plain injection pipe（21）For straight tube structure, with exhaust pipe（1）The angle that is formed of tube wall be more than 90 °, and tapered portion（212）Near-ring
Shape air chamber（11）Setting.
8. a kind of SCR urea according to any one of claim 3 ﹣ 6 sprays protection system, it is characterised in that：The urine
Plain injection pipe（21）For L-type bend pipe structure, including vertical tube connected vertically（213）, transverse tube（214）, the vertical tube（213）With row
Tracheae（1）Tube wall formed angle be 90 °, the transverse tube（214）Ejection end stretch into annular air chamber（11）It encloses
Region in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721625140.3U CN207634148U (en) | 2017-11-29 | 2017-11-29 | SCR urea sprays protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721625140.3U CN207634148U (en) | 2017-11-29 | 2017-11-29 | SCR urea sprays protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207634148U true CN207634148U (en) | 2018-07-20 |
Family
ID=62854452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721625140.3U Active CN207634148U (en) | 2017-11-29 | 2017-11-29 | SCR urea sprays protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207634148U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107916973A (en) * | 2017-11-29 | 2018-04-17 | 东风商用车有限公司 | SCR urea sprays protection system |
| CN113898448A (en) * | 2021-11-05 | 2022-01-07 | 无锡亿利环保科技有限公司 | Urea mixer with forward air intake |
-
2017
- 2017-11-29 CN CN201721625140.3U patent/CN207634148U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107916973A (en) * | 2017-11-29 | 2018-04-17 | 东风商用车有限公司 | SCR urea sprays protection system |
| CN107916973B (en) * | 2017-11-29 | 2020-08-04 | 东风商用车有限公司 | SCR urea sprays protection system |
| CN113898448A (en) * | 2021-11-05 | 2022-01-07 | 无锡亿利环保科技有限公司 | Urea mixer with forward air intake |
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