CN203856561U - Engine exhaust pipe based on SCR tail-gas post-processing technology - Google Patents
Engine exhaust pipe based on SCR tail-gas post-processing technology Download PDFInfo
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- CN203856561U CN203856561U CN201420293899.6U CN201420293899U CN203856561U CN 203856561 U CN203856561 U CN 203856561U CN 201420293899 U CN201420293899 U CN 201420293899U CN 203856561 U CN203856561 U CN 203856561U
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- exhaust pipe
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- 238000005516 engineering process Methods 0.000 title claims abstract description 25
- 238000012805 post-processing Methods 0.000 title abstract description 6
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract description 8
- 238000002955 isolation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Exhaust Silencers (AREA)
Abstract
The utility model discloses an engine exhaust pipe based on the SCR tail-gas post-processing technology, and belongs to the technical field of engine tail-gas post-processing. The engine exhaust pipe comprises an inner exhaust pipe body and an outer exhaust pipe body which are installed together in a sleeved mode. The inner exhaust pipe body and the outer exhaust pipe body are both integrated thin-wall different-nature elbows formed in a hydraulic forming mode. The two ends of the inner exhaust pipe body and the outer exhaust pipe body are all sealed. A vacuum cavity for heat isolation and heat preservation is formed between the inner exhaust pipe body and the outer exhaust pipe body. The engine exhaust pipe has the excellent heat-insulation and heat-preservation performance, even in the low-temperature state, the conservation rate of Nx in an SCR tail-gas post-processing system can be sufficiently guaranteed, the reliability is high, cost is greatly reduced, and the technical problems of the SCR tail-gas post-processing are solved.
Description
Technical field
The utility model relates to motor exhaust post-processing technology field, especially relates to a kind of engine exhaust pipe based on SCR exhaust aftertreatment technology.
Background technique
Selective catalytic reduction SCR technology is the mainstream technology route of state four and more maximum discharge rules, in order to reach suitable Nx conversion ratio, needs delivery temperature need be controlled at 230 ℃-450 ℃.During low load operation, gas exhaust manifold enters approximately 250 ℃ of the waste gas minimum temperatures of offgas duct, and tail gas can be greater than 40 ℃ by the temperature reduction of conventional pipe fitting, cannot reach suitable Nx conversion ratio, therefore must take Insulation to control exhaust temperature depreciation.For the demand of SCR system exhaust pipe insulation, in order to reach heat insulation effect, the mode at exhaust tube wall parcel collet or thermal baffle of available technology adopting, the shortcoming of collet is, corrosion-resistant, weather-resistant property is poor, and outward appearance is not attractive in appearance, and collet mostly needs import, and cost is higher; And thermal baffle takes up room greatly, cost is also higher.
Model utility content
Technical problem to be solved in the utility model is: a kind of engine exhaust pipe based on SCR exhaust aftertreatment technology is provided, there is excellent heat preservation and insulation, even under low-temperature condition, also can fully guarantee the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, reliability is high, and cost reduces greatly, overcome the technical barrier of SCR exhaust aftertreatment.
For solving the problems of the technologies described above, the technical solution of the utility model is: the engine exhaust pipe based on SCR exhaust aftertreatment technology, comprise the internal layer exhaust pipe and the outer exhaust pipe that are set in together, described internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, setting is all sealed at described internal layer exhaust pipe and outer exhaust pipe two ends, is formed for vacuum cavity heat insulation and insulation between described internal layer exhaust pipe and outer exhaust pipe.
Preferably, the tube wall of described outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure.
Preferably, the variable cross section body of described outer exhaust pipe for processing by shaped by fluid pressure.
Preferably, the variable cross section body of described internal layer exhaust pipe for processing by shaped by fluid pressure.
Preferably, described outer exhaust pipe is provided with the annular groove for positioning lathe dog.
Preferably, described internal layer exhaust pipe and outer exhaust pipe two ends are sealed by flange part or are passed through flanging seal.
Preferably, described internal layer exhaust pipe and outer exhaust pipe are thin-wall stainless steel or thin-walled carbon pipe.
Preferably, the wall thickness of described internal layer exhaust pipe and outer exhaust pipe is 0.6-1mm.
Adopted technique scheme, the beneficial effects of the utility model are: because the engine exhaust pipe based on SCR exhaust aftertreatment technology comprises internal layer exhaust pipe and outer exhaust pipe and two ends, all seal setting, and internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, between internal layer exhaust pipe and outer exhaust pipe, form vacuum cavity, vacuum cavity has excellent heat preservation and insulation, even under low-temperature condition, also can guarantee that the depreciation of temperature is in 10 ℃, avoid aqueous solution of urea crystallization, fully guaranteed the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, the integral type thin-wall stainless steel opposite sex bend pipe that shaped by fluid pressure processes, from weatherability, ageing-resistant, the thermal baffle and the collet that in decay resistance and reliability, are all better than available technology adopting, replaced many places welding, effectively avoided product failure, greatly improved the reliability of product, and outward appearance is novel, promoted product specification, and than thermal baffle and collet lightweight more than 20%, structural strength is higher, therefore overall cost has more advantage.In addition, this engine exhaust pipe also can be applicable in the type of heat insulation demand, and effectively protection package is rolled in the wire harness on outlet pipe.In addition, due to the petrol engine thermal efficiency 30% left and right, the diesel engine thermal efficiency 40% left and right, its loss part more than 50% is got rid of with tail gas, this engine exhaust pipe provides a kind of new way for efficiently collecting using waste heat from tail gas, for example, heat-preservation exhaust pipe is introduced hollow compartment plate by high-temperature tail gas, can effectively solve the technical barrier that cold area engineering vehicle compartment freezes and can not normally dig.
Because the tube wall of outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure, when having reduced body thickness, further improved the structural strength of engine exhaust pipe.
Because outer exhaust pipe and internal layer exhaust pipe are the variable cross section body processing by shaped by fluid pressure, the pipe structure of variable cross section can be saved material on the basis of proof strength, further realizes lightweight.
Because outer exhaust pipe is provided with annular groove, can directly with clip, to this engine exhaust pipe, be fixed, and improve the structural strength of engine exhaust pipe.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment's structural representation;
Fig. 2 is that Fig. 1 is at the sectional view at A-A place;
Fig. 3 is the stereogram of Fig. 1;
Wherein: 1, internal layer exhaust pipe; 2, outer exhaust pipe; 3, vacuum cavity; 4, concavo-convex stiffening rib; 5, annular groove; 6, clip; 7, flange part; 8, lapped pipe end.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Shown in common with Fig. 3 as shown in Figure 1, Figure 2, engine exhaust pipe based on SCR exhaust aftertreatment technology, comprise the internal layer exhaust pipe 1 and the outer exhaust pipe 2 that are set in together, internal layer exhaust pipe 1 is with outer exhaust pipe 2 the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, internal layer exhaust pipe 1 all seals setting with outer exhaust pipe 2 two ends, is formed for vacuum cavity 3 heat insulation and insulation between internal layer exhaust pipe 1 and outer exhaust pipe 2.
The tube wall of outer exhaust pipe 2 is provided with some the concavo-convex stiffening ribs 4 that process by shaped by fluid pressure, when having reduced body thickness, has further improved the structural strength of engine exhaust pipe.The variable cross section body of outer exhaust pipe 2 for processing by shaped by fluid pressure, the variable cross section body of internal layer exhaust pipe 1 for processing by shaped by fluid pressure, the pipe structure of variable cross section also can be saved material on the basis of proof strength, further realizes lightweight.
In the utility model, the integral type thin-walled opposite sex bend pipe that shaped by fluid pressure processes only has a weld seam longitudinally, laterally there is no weld seam, from completely different by the body that repeatedly laterally welding forms, can effectively avoid product failure, greatly improved the reliability of product, and outward appearance is novel, has promoted product specification.
Outer exhaust pipe 2 is provided with annular groove 5, can directly with 6 pairs of these engine exhaust pipe of clip, be fixed, and improve the structural strength of engine exhaust pipe.
Internal layer exhaust pipe 1 seals by flange part 7 with outer exhaust pipe 2 two ends or passes through flanging seal, in the present embodiment, internal layer exhaust pipe 1 adopts flange part 7 with outer exhaust pipe 2 one end, the other end is lapped pipe end 8, and internal layer exhaust pipe 1 is thin-wall stainless steel or thin-walled carbon pipe with outer exhaust pipe 2.Internal layer exhaust pipe 1 is 0.6-1mm with the wall thickness of outer exhaust pipe 2.
The vacuum cavity 3 of the utility model engine exhaust pipe has excellent heat preservation and insulation, even under low-temperature condition, also can guarantee that the depreciation of temperature is in 10 ℃, avoid aqueous solution of urea crystallization, fully guaranteed the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, the integral type thin-wall stainless steel opposite sex bend pipe that shaped by fluid pressure processes is from weatherability, ageing-resistant, the thermal baffle and the collet that in decay resistance and reliability, are all better than available technology adopting, replaced many places welding, effectively avoided product failure, greatly improved the reliability of product, and outward appearance is novel, promoted product specification, and than thermal baffle and collet lightweight more than 20%, structural strength is higher, therefore overall cost has more advantage.In addition, this engine exhaust pipe also can be applicable in the type of heat insulation demand, and effectively protection package is rolled in the wire harness on outlet pipe.In addition, due to the petrol engine thermal efficiency 30% left and right, the diesel engine thermal efficiency 40% left and right, its loss part more than 50% is got rid of with tail gas, this engine exhaust pipe provides a kind of new way for efficiently collecting using waste heat from tail gas, for example, heat-preservation exhaust pipe is introduced hollow compartment plate by high-temperature tail gas, can effectively solve the technical barrier that cold area engineering vehicle compartment freezes and can not normally dig.
In sum, the utility model is particularly suitable in SCR exhaust aftertreatment technology, vacuum cavity 3 has excellent heat preservation and insulation, even under low-temperature condition, also can fully guarantee the conversion ratio of the Nx in SCR exhaust gas aftertreatment system, reliability is high, and cost reduces greatly, has overcome the global problem of SCR exhaust aftertreatment technology.
The utility model is not limited to above-mentioned concrete mode of execution, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done, within all dropping on protection domain of the present utility model.
Claims (8)
1. the engine exhaust pipe based on SCR exhaust aftertreatment technology, it is characterized in that, comprise the internal layer exhaust pipe and the outer exhaust pipe that are set in together, described internal layer exhaust pipe and outer exhaust pipe are the integral type thin-walled opposite sex bend pipe processing by shaped by fluid pressure, setting is all sealed at described internal layer exhaust pipe and outer exhaust pipe two ends, is formed for vacuum cavity heat insulation and insulation between described internal layer exhaust pipe and outer exhaust pipe.
2. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, the tube wall of described outer exhaust pipe is provided with some the concavo-convex stiffening ribs that process by shaped by fluid pressure.
3. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, the variable cross section body of described outer exhaust pipe for processing by shaped by fluid pressure.
4. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 3, is characterized in that, the variable cross section body of described internal layer exhaust pipe for processing by shaped by fluid pressure.
5. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described outer exhaust pipe is provided with the annular groove for positioning lathe dog.
6. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described internal layer exhaust pipe and outer exhaust pipe two ends are sealed by flange part or passed through flanging seal.
7. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 1, is characterized in that, described internal layer exhaust pipe and outer exhaust pipe are thin-wall stainless steel or thin-walled carbon pipe.
8. the engine exhaust pipe based on SCR exhaust aftertreatment technology as claimed in claim 7, is characterized in that, the wall thickness of described internal layer exhaust pipe and outer exhaust pipe is 0.6-1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293899.6U CN203856561U (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail-gas post-processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293899.6U CN203856561U (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail-gas post-processing technology |
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| Publication Number | Publication Date |
|---|---|
| CN203856561U true CN203856561U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420293899.6U Expired - Lifetime CN203856561U (en) | 2014-06-04 | 2014-06-04 | Engine exhaust pipe based on SCR tail-gas post-processing technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982285A (en) * | 2014-06-04 | 2014-08-13 | 潍坊倍力汽车零部件有限公司 | Engine exhaust pipe based on SCR tail gas aftertreatment technology |
-
2014
- 2014-06-04 CN CN201420293899.6U patent/CN203856561U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982285A (en) * | 2014-06-04 | 2014-08-13 | 潍坊倍力汽车零部件有限公司 | Engine exhaust pipe based on SCR tail gas aftertreatment technology |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |