CN104832255A - Dual-layer mixing pipe and exhaust treating device thereof - Google Patents
Dual-layer mixing pipe and exhaust treating device thereof Download PDFInfo
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- CN104832255A CN104832255A CN201510243073.8A CN201510243073A CN104832255A CN 104832255 A CN104832255 A CN 104832255A CN 201510243073 A CN201510243073 A CN 201510243073A CN 104832255 A CN104832255 A CN 104832255A
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Abstract
The invention discloses a dual-layer mixing pipe. The dual-layer mixing pipe comprises an inner pipe, an outer pipe and a transition pipe, wherein the outer pipe sleeves the periphery of the inner pipe; the transition pipe is connected with the inner pipe; the inner pipe is through along the axial direction and comprises a first end and a second end which are oppositely arranged in the axial direction; the transition pipe is connected with the first end; the outer pipe comprises a first half pipe and a second half pipe which are matched with each other; the first half pipe and the second half pipe are staggered in the radial direction, so that a first outlet and a second outlet are formed in the circumferential direction; the opening directions of the first outlet and the second outlet are opposite, so that exhaust rotational flow is formed. According to the dual-layer mixing pipe, the travel of air flow in a limited space is increased, the evaporating distance of urea droplets is increased, the evaporation rate is improved, the mixing uniformity is improved, and the risk of urea crystallization is reduced. The invention also discloses an exhaust treating device with the dual-layer mixing pipe.
Description
Technical field
The present invention relates to a kind of two-layer hybrid pipe and exhaust gas treatment device thereof, belong to engine exhaust post-processing technology field.
Background technique
Research shows that the uniformity coefficient of ammonia distribution in exhaust after treatment system (such as selective catalytic reduction system operating, SCR system) pipeline has important impact to the overall performance of system and endurance quality.If ammonia skewness can cause regional area ammonia too much thus easily cause NH_3 leakage, and causes oxynitrides (NOx) transformation efficiency too low at other ammonia thin areas.The uneven distribution of long-time ammonia can cause catalyst ageing uneven, thus affects the overall performance of catalyzer.In addition, the uneven distribution of urea droplets can cause local tube wall or mixed construction temperature too low, form crystallization, outlet pipe can be blocked time serious, cause engine power performance to decline.
Therefore, the exhaust gas treatment device a kind of novel mixing tube being provided and there is this mixing tube is necessary, to solve the problems of the technologies described above.
Summary of the invention
The object of the present invention is to provide a kind of two-layer hybrid pipe mixed and the exhaust gas treatment device with this two-layer hybrid pipe.
For achieving the above object, the present invention adopts following technological scheme: a kind of two-layer hybrid pipe, for in engine exhaust treatment apparatus, described two-layer hybrid pipe comprises interior pipe, the outer tube being enclosed within described interior pipe periphery and the transition tube be connected with described interior pipe, described interior pipe is through vertically, the first end be axially oppositely arranged described in described interior pipe is included in and the second end, wherein said transition tube is connected with described first end, described outer tube comprises the first semicanal and the second semicanal that cooperatively interact, described first semicanal and described second semicanal mutually stagger to form the first outlet and second in the circumferential diametrically and export, described first outlet is contrary with the opening direction that described second exports is vented eddy flow in order to be formed.
As further improved technical scheme of the present invention, the 3rd end be axially oppositely arranged described in described outer tube is included in and the 4th end, wherein said 3rd end is near described first end, and described 4th end is near described second end; Described two-layer hybrid pipe also comprises and is positioned at described 4th end place and in order to the end plate of reflected gas stream.
As further improved technical scheme of the present invention, described second end and described end plate are axially spaced a distance described, and described end plate is provided with the arc convex protruded out to described second end.
As further improved technical scheme of the present invention, axially align described mutually with the axis of described interior pipe in the center of described arc convex, described end plate is provided with the arc-shaped concave being positioned at described arc convex periphery.
As further improved technical scheme of the present invention, the mating face that described transition tube is provided with the conical surface diametrically between described interior pipe and described outer tube and inserts along described axis in described first end, described mating face welds with described interior pipe.
As further improved technical scheme of the present invention, described 3rd end welds with the described conical surface, and described end plate is provided with the step surface of locating described 4th end.
As further improved technical scheme of the present invention, described first semicanal comprises the first end and the second end that lay respectively at both sides; Described second semicanal comprises the 3rd end and the 4th end that lay respectively at both sides; Described first end is near described 3rd end, and described first outlet is between described first end and described 3rd end; Described second end is near described 4th end, and described second outlet is between described second end and described 4th end.
As further improved technical scheme of the present invention, the first wall extension that described first semicanal comprises the first arc pipe and is connected with described first arc pipe, described first end is positioned on described first arc pipe, and described second end is positioned on described first wall extension; The second wall extension that described second semicanal comprises the second arc pipe and is connected with described second arc pipe, described 3rd end is positioned on described second wall extension, and described 4th end is positioned on described second arc pipe; Described second end is positioned at the outside of described 4th end and extends beyond described 4th end in the circumferential, and described 3rd end is positioned at the outside of described first end and extends beyond described first end in the circumferential.
Present invention also offers a kind of exhaust gas treatment device, it comprises housing and is installed on the vent gas treatment module in described housing, described housing comprises the first cavity being positioned at described vent gas treatment module upstream and the second cavity being positioned at described vent gas treatment module down-stream, described exhaust gas treatment device also comprises above-mentioned two-layer hybrid pipe, and described two-layer hybrid pipe is positioned at described first cavity.
As further improved technical scheme of the present invention, described housing comprises the end cone being provided with gas inlet, and described end cone is provided with the fitting seat installing urea nozzle, and described gas inlet is communicated with described transition tube.
As further improved technical scheme of the present invention, described exhaust gas treatment device also comprise be positioned at described first cavity the first dividing plate so that described first cavity is divided into the first buffer cavity and the second buffer cavity, described two-layer hybrid pipe is positioned at described first buffer cavity, described vent gas treatment module is positioned at the downstream of described first dividing plate and is connected with described second buffer cavity, and the part beyond the corresponding described two-layer hybrid pipe of described first dividing plate is provided with some first through holes to be communicated with described second buffer cavity by described first buffer cavity.
As further improved technical scheme of the present invention, described exhaust gas treatment device also comprise be positioned at described second cavity second partition so that described second cavity is divided into the 3rd buffer cavity and the 4th buffer cavity, described exhaust gas treatment device comprises through described second partition and extends into the outer pipe in described 3rd buffer cavity, described second partition is provided with some second through holes to be communicated with described 4th buffer cavity by described 3rd buffer cavity, and described outer pipe is also provided with the some vents be connected with described 4th buffer cavity.
Compared to prior art, two-layer hybrid pipe of the present invention comprises interior pipe and outer tube, wherein said outer tube comprises the first semicanal and the second semicanal that cooperatively interact, described first semicanal and described second semicanal mutually stagger to form the first outlet and second in the circumferential diametrically and export, and described first outlet is contrary with the opening direction that described second exports is vented eddy flow in order to be formed.Setting like this, adds the stroke of air-flow in the confined space, to increase the distance of urea droplets evaporation, improves relative evaporation, improves the uniformity of mixing, reduce the risk of urea crystals.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of exhaust gas treatment device of the present invention.
Fig. 2 is the schematic perspective view of another angle of Fig. 1.
Fig. 3 is the plan view of Fig. 1.
Fig. 4 is the right elevation of Fig. 1.
Fig. 5 is the left view of Fig. 1.
Fig. 6 is the three-dimensional exploded view of Fig. 1.
Fig. 7 is the three-dimensional exploded view of another angle of Fig. 6.
Fig. 8 is the generalized section along A-A line in Fig. 3.
Fig. 9 is the stereogram of two-layer hybrid pipe in Fig. 1.
Figure 10 is the plan view of Fig. 9.
The angle of Figure 11 and Figure 10 is identical, and has gone out the sense of rotation of exhaust with arrows.
Embodiment
Shown in please refer to the drawing 1 to Fig. 8, present invention is disclosed a kind of exhaust gas treatment device 100, in order to the exhaust (such as reduce the content of oxynitrides and/or reduce the content etc. of particulate matter) of purifying engine.Described exhaust gas treatment device 100 comprises housing 1, the vent gas treatment module 2(such as selective oxidation catalytic module be installed in described housing 1, SCR) and to be installed in described housing 1 and to be positioned at the two-layer hybrid pipe 3 of described vent gas treatment module 2 upstream.
Shown in please refer to the drawing 6 to Fig. 8, roughly cylindrically, it comprises the first cavity 11 being positioned at described vent gas treatment module 2 upstream, the second cavity 12 being positioned at described vent gas treatment module 2 downstream, is positioned at the first dividing plate 13 of described first cavity 11 and is positioned at the second partition 14 of described second cavity 12 described housing 1.Described first cavity 11 is divided into the first buffer cavity 111 being positioned at upstream and the second buffer cavity 112 being positioned at downstream by described first dividing plate 13, and described second cavity 12 is divided into the 3rd buffer cavity 121 being positioned at upstream and the 4th buffer cavity 122 being positioned at downstream by described second partition 14.
Shown in please refer to the drawing 1 to Fig. 5, described housing 1 also comprises the end cone 15 being provided with gas inlet 151, and described end cone 15 is provided with the fitting seat 152 installing urea nozzle.
Shown in please refer to the drawing 8, the transition tube 33 that described two-layer hybrid pipe 3 comprises interior pipe 31, is enclosed within the outer tube 32 of described interior pipe 31 periphery and is connected with described interior pipe 31.Cylindrically, it is through vertically for described interior pipe 31.The first end 311 be axially oppositely arranged described in described interior pipe 31 is included in and the second end 312.Described outer tube 32 cylindrically, its be included in described in the 3rd end 321 that is axially oppositely arranged and the 4th end 322, wherein said 3rd end 321 is near described first end 311, and described 4th end 322 is near described second end 312.
The mating face 332 that described transition tube 33 is provided with the conical surface 331 diametrically between described interior pipe 31 and described outer tube 32 and inserts along described axis in described first end 311, described mating face 332 welds with described interior pipe 31.Transitional surface can be made comparatively level and smooth by being inserted by described mating face 332 in described first end 311, thus reduce the risk of urea crystals.Described 3rd end 321 welds with the described conical surface 332, thus is fixed in described transition tube 33 by described outer tube 32.In illustrative embodiments of the present invention, the bottom of the described conical surface 332 is provided with some perforates 333, and described perforate 333 is relative with described urea nozzle.This design can reduce the back pressure of system on the one hand, and on the other hand, once urea forms crystallization after the injection, crystallization can be taken away by described perforate 333 by exhaust.
Shown in please refer to the drawing 8, described two-layer hybrid pipe 3 also comprises and is positioned at described 4th end 322 place and in order to the end plate 34 of reflected gas stream.In illustrative embodiments of the present invention, described end plate 34 is the intermediate portion of described first dividing plate 13.Described second end 312 is axially spaced a distance described with described end plate 34, and described end plate 34 is provided with the arc convex 341 protruded out to described second end 312 and the arc-shaped concave 342 being positioned at described arc convex 341 periphery.Axially align described mutually with the axis of described interior pipe 31 in the center of described arc convex 341.It should be noted that, by arranging arc convex 341 and arc-shaped concave 342 makes described end plate 34 undulate, thus good flow-disturbing effect can be played.In addition, described end plate 34 is also provided with the step surface 343 of locating described 4th end 322, and described outer tube 32 welds at described step surface 343 place with described end plate 34.Certainly, in order to back pressure is considered, the perforate of suitable quantity can also be offered at described end plate 34.
Shown in please refer to the drawing 9 to Figure 11, described outer tube 32 comprises the first semicanal 35 and the second semicanal 36 cooperatively interacted, described first semicanal 35 mutually staggers to form the first outlet 350 and second in the circumferential diametrically with described second semicanal 36 and exports 360, and described first exports 350 and described second opening directions exporting 360 is vented eddy flow on the contrary in order to be formed.
Particularly, the first wall extension 352 that described first semicanal 35 comprises the first arc pipe 351 and is connected with described first arc pipe 351, described first arc pipe 351 is provided with the first end 353, and described first wall extension 352 is provided with the second end 354.Similarly, the second wall extension 362 that described second semicanal 36 comprises the second arc pipe 361 and is connected with described second arc pipe 361, described second wall extension 362 is provided with the 3rd end 363, and described second arc pipe 361 is provided with the 4th end 364.Described second end 354 is positioned at the outside of described 4th end 364 and extends beyond described 4th end 364 in the circumferential, and described 3rd end 363 is positioned at the outside of described first end 353 and extends beyond described first end 353 in the circumferential.Described first end 353 is near described 3rd end 363, and described first outlet 350 is between described first end 353 and described 3rd end 363.Described second end 354 is near described 4th end 364, and described second outlet 360 is between described second end 354 and described 4th end 364.
Shown in please refer to the drawing 6 to Fig. 8, described two-layer hybrid pipe 3 is positioned at described first buffer cavity 111.Part beyond the corresponding described two-layer hybrid pipe 3 of described first dividing plate 13 is provided with some first through holes 131 to be communicated with described second buffer cavity 112 by described first buffer cavity 111.
Described exhaust gas treatment device 100 also comprises through described second partition 14 and extends into the outer pipe 16 in described 3rd buffer cavity 121, and described second partition 14 is provided with some second through holes 141 to be communicated with described 4th buffer cavity 122 by described 3rd buffer cavity 121.Described outer pipe 16 is also provided with the some vents 161 be connected with described 4th buffer cavity 122.In illustrative embodiments of the present invention, described exhaust gas treatment device 100 can play the effect of purifying exhaust gas and noise reduction simultaneously.Preferably, silencing cotton can be filled in described 4th buffer cavity 122, to improve the effect of noise reduction.
Shown in please refer to the drawing 8 to Figure 11, exhaust air flow mode of the present invention is as follows:
First, the exhaust of motor is from described gas inlet 151 inlet end cone 15.Under the control of the controller, urea liquid is atomised in described end cone 15 by urea nozzle, and mixes with described exhaust.Then, exhaust enters described interior pipe 31 with the urea liquid of atomization under the guiding of described transition tube 33, and then leaves from the second end 312 of described interior pipe 31.Because the 4th end 322 of described outer tube 32 is substantially airtight by described end plate 34, exhaust is got on described end plate 34 and can be formed reflux.Enter described outer tube 32 from the second end 312 exhaust mixture out of described interior pipe 31, and form eddy flow, thus add the stroke of air-flow in the confined space, add the distance of urea droplets evaporation, improve relative evaporation, improve the uniformity of mixing, reduce the risk of urea crystals.
Enter described second buffer cavity 112 through mixed exhaust mixture through described first through hole 131, and then purified by vent gas treatment module 2.Finally, leave after part exhaust directly enters outer pipe 16 by the 3rd buffer cavity 121; Another part exhaust, through described second through hole 141, is then left after described vent 161 enters outer pipe 16.
Two-layer hybrid pipe 3 of the present invention can improve the mixing uniformity of exhaust and urea liquid, thus improves the efficiency of exhaust gas purification, reduces the risk of urea crystals.
In addition, above embodiment is only for illustration of the present invention and unrestricted technological scheme described in the invention, understanding of this description should based on person of ordinary skill in the field, although this specification reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technological scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (12)
1. a two-layer hybrid pipe, for in engine exhaust treatment apparatus, described two-layer hybrid pipe comprises interior pipe, the outer tube being enclosed within described interior pipe periphery and the transition tube be connected with described interior pipe, it is characterized in that: described interior pipe is through vertically, the first end be axially oppositely arranged described in described interior pipe is included in and the second end, wherein said transition tube is connected with described first end, described outer tube comprises the first semicanal and the second semicanal that cooperatively interact, described first semicanal and described second semicanal mutually stagger to form the first outlet and second in the circumferential diametrically and export, described first outlet is contrary with the opening direction that described second exports is vented eddy flow in order to be formed.
2. two-layer hybrid pipe as claimed in claim 1, it is characterized in that: the 3rd end be axially oppositely arranged described in described outer tube is included in and the 4th end, wherein said 3rd end is near described first end, and described 4th end is near described second end; Described two-layer hybrid pipe also comprises and is positioned at described 4th end place and in order to the end plate of reflected gas stream.
3. two-layer hybrid pipe as claimed in claim 2, it is characterized in that: described second end and described end plate are axially spaced a distance described, described end plate is provided with the arc convex protruded out to described second end.
4. two-layer hybrid pipe as claimed in claim 3, is characterized in that: axially align described mutually with the axis of described interior pipe in the center of described arc convex, described end plate is provided with the arc-shaped concave being positioned at described arc convex periphery.
5. two-layer hybrid pipe as claimed in claim 2, it is characterized in that: the mating face that described transition tube is provided with the conical surface diametrically between described interior pipe and described outer tube and inserts along described axis in described first end, described mating face welds with described interior pipe.
6. two-layer hybrid pipe as claimed in claim 5, it is characterized in that: described 3rd end welds with the described conical surface, described end plate is provided with the step surface of locating described 4th end.
7. two-layer hybrid pipe as claimed in claim 1, is characterized in that: described first semicanal comprises the first end and the second end that lay respectively at both sides; Described second semicanal comprises the 3rd end and the 4th end that lay respectively at both sides; Described first end is near described 3rd end, and described first outlet is between described first end and described 3rd end; Described second end is near described 4th end, and described second outlet is between described second end and described 4th end.
8. two-layer hybrid pipe as claimed in claim 7, it is characterized in that: the first wall extension that described first semicanal comprises the first arc pipe and is connected with described first arc pipe, described first end is positioned on described first arc pipe, and described second end is positioned on described first wall extension; The second wall extension that described second semicanal comprises the second arc pipe and is connected with described second arc pipe, described 3rd end is positioned on described second wall extension, and described 4th end is positioned on described second arc pipe; Described second end is positioned at the outside of described 4th end and extends beyond described 4th end in the circumferential, and described 3rd end is positioned at the outside of described first end and extends beyond described first end in the circumferential.
9. an exhaust gas treatment device, it comprises housing and is installed on the vent gas treatment module in described housing, described housing comprises the first cavity being positioned at described vent gas treatment module upstream and the second cavity being positioned at described vent gas treatment module down-stream, it is characterized in that: described exhaust gas treatment device also comprises the two-layer hybrid pipe as described in any one in claim 1 to 8, and described two-layer hybrid pipe is positioned at described first cavity.
10. exhaust gas treatment device as claimed in claim 9, is characterized in that: described housing comprises the end cone being provided with gas inlet, and described end cone is provided with the fitting seat installing urea nozzle, and described gas inlet is communicated with described transition tube.
11. exhaust gas treatment devices as claimed in claim 9, it is characterized in that: described exhaust gas treatment device also comprise be positioned at described first cavity the first dividing plate so that described first cavity is divided into the first buffer cavity and the second buffer cavity, described two-layer hybrid pipe is positioned at described first buffer cavity, described vent gas treatment module is positioned at the downstream of described first dividing plate and is connected with described second buffer cavity, and the part beyond the corresponding described two-layer hybrid pipe of described first dividing plate is provided with some first through holes to be communicated with described second buffer cavity by described first buffer cavity.
12. exhaust gas treatment devices as claimed in claim 9, it is characterized in that: described exhaust gas treatment device also comprise be positioned at described second cavity second partition so that described second cavity is divided into the 3rd buffer cavity and the 4th buffer cavity, described exhaust gas treatment device comprises through described second partition and extends into the outer pipe in described 3rd buffer cavity, described second partition is provided with some second through holes to be communicated with described 4th buffer cavity by described 3rd buffer cavity, and described outer pipe is also provided with the some vents be connected with described 4th buffer cavity.
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| CN201510243073.8A CN104832255B (en) | 2015-05-13 | 2015-05-13 | Two-layer hybrid pipe and its exhaust gas treatment device |
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| CN201510243073.8A CN104832255B (en) | 2015-05-13 | 2015-05-13 | Two-layer hybrid pipe and its exhaust gas treatment device |
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Cited By (6)
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| WO2016180244A1 (en) * | 2015-05-13 | 2016-11-17 | 天纳克（苏州）排放***有限公司 | Two-layer mixing tube and exhaust treatment apparatus having same |
| CN108266256A (en) * | 2017-12-13 | 2018-07-10 | 江苏多为泵业股份有限公司 | A kind of exhaust end cone |
| CN108457727A (en) * | 2018-04-19 | 2018-08-28 | 凯德斯环保科技（苏州）有限公司 | SCR urea mixers |
| US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| WO2019128163A1 (en) * | 2017-12-29 | 2019-07-04 | 天纳克（苏州）排放***有限公司 | Tail gas after-treatment mixing apparatus and package thereof |
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| CN204646381U (en) * | 2015-05-13 | 2015-09-16 | 天纳克（苏州）排放***有限公司 | Two-layer hybrid pipe and exhaust gas treatment device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016180244A1 (en) * | 2015-05-13 | 2016-11-17 | 天纳克（苏州）排放***有限公司 | Two-layer mixing tube and exhaust treatment apparatus having same |
| CN108266256A (en) * | 2017-12-13 | 2018-07-10 | 江苏多为泵业股份有限公司 | A kind of exhaust end cone |
| WO2019128163A1 (en) * | 2017-12-29 | 2019-07-04 | 天纳克（苏州）排放***有限公司 | Tail gas after-treatment mixing apparatus and package thereof |
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| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
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