CN103742242A - SCR (Selective Catalytic Reduction) catalytic muffler and air outlet pipe thereof - Google Patents
SCR (Selective Catalytic Reduction) catalytic muffler and air outlet pipe thereof Download PDFInfo
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- CN103742242A CN103742242A CN201310727432.8A CN201310727432A CN103742242A CN 103742242 A CN103742242 A CN 103742242A CN 201310727432 A CN201310727432 A CN 201310727432A CN 103742242 A CN103742242 A CN 103742242A
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- outlet pipe
- steam outlet
- scr catalytic
- catalytic muffler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses an air outlet pipe of an SCR (Selective Catalytic Reduction) catalytic muffler. The air outlet pipe comprises an outer layer pipe (1) and an inner layer pipe (2); two ends of the inner layer pipe (2) are in transition connection with two ends of the outer layer pipe (1) through conical surfaces (3) respectively; the empty chamber which is formed between the outer layer pipe (1) and the inner layer pipe (2) is filled with sound-absorbing materials; the pipe wall of the inner layer pipe (2) is provided with a first sound-absorbing hole (4) which is communicated with the empty chamber. According to the air outlet pipe, the sound-absorbing effect is good and accordingly the sound absorption and noise reduction effects of the SCR catalytic muffler can be significantly improved. The invention also discloses the SCR catalytic muffler which is provided with the air outlet pipe.
Description
Technical field
The present invention relates to the steam outlet pipe for the treatment of of diesel exhaust technical field, particularly diesel SCR catalytic muffler.The invention still further relates to the SCR catalytic muffler that is provided with described steam outlet pipe.
Background technique
At present, environment is one of several large problems of the world today with polluting, and noise pollution has also more and more caused people's attention, and laws and regulations have also been made corresponding restriction to engine noise.
SCR technology is one of main post-processing technology of eliminating nitrogen oxide in diesel exhaust gas, according to function, is mainly divided into control unit, urea dosage device and catalytic reaction unit three parts.
The control unit of SCR system and the control unit of motor (ECU) integrate, mainly for carrying out SCR control strategy, and according to sensor signal control urea dosage devices such as ambient temperature, delivery temperature, urea level, urea temperature, urea pressure, NOx concentration, spraying urea liquid is mapped in exhaust airstream according to demand at regular time and quantity.
Urea dosage device mainly comprises urea box, urea supply unit, urea-spray unit, heating module and connecting pipeline and circuit, guarantees abundant atomization and the decomposition of urea liquid.
Catalytic reaction unit (being SCR catalytic muffler) mainly comprises SCR catalyzer, carrier and encapsulation thereof, and being used for the main harmful components reduction of nitrogen oxide in diesel exhaust gas is nitrogen G&W.
During work, aqueous solution of urea sprays into outlet pipe or directly sprays in SCR catalytic muffler through urea nozzle, in temperature, more than 200 ℃ pyrolytic reaction occurs, and produces ammonia (NH
3), ammonia reacts with the nitrogen oxide (NOx) in tail gas under the effect of catalyzer in SCR catalytic muffler, reaches the object of eliminating diesel engine vent gas nitrogen oxide (NOx).
Please refer to Fig. 1, Fig. 1 is the structural representation of existing SCR catalytic muffler.
As shown in the figure, this SCR catalytic muffler afterbody be just simply designed with one section of steam outlet pipe 2 ', directly from the outlet chamber of rear end, draw, can not decay the preferably noise of tail gas, that is to say, although SCR catalytic muffler itself has noise elimination function, its steam outlet pipe 2 ＇ can not play any noise elimination noise reduction effect, need further improvement.
Therefore, how further improving the noise elimination noise reduction effect of SCR catalytic muffler, is those skilled in the art's technical issues that need to address.
Summary of the invention
The first object of the present invention is to provide a kind of SCR catalytic muffler steam outlet pipe.This steam outlet pipe has good noise elimination effect, can significantly improve the noise elimination noise reduction effect of SCR catalytic muffler.
The second object of the present invention is to provide a kind of SCR catalytic muffler that is provided with described steam outlet pipe.
For achieving the above object, the invention provides a kind of SCR catalytic muffler steam outlet pipe, comprise external pipe and inner tube, the two ends of described inner tube are connected by conical surface transition with the two ends of described external pipe respectively, filling sucting sound material in cavity between described external pipe and inner tube, offers the first bloop being communicated with described cavity on the tube wall of described inner tube.
Preferably, the described conical surface is inner conical surface.
Preferably, on the conical surface of described external pipe and inner tube outlet side, offer the second bloop.
Preferably, the aperture of described the second bloop is greater than the aperture of described the first bloop.
Preferably, described the first bloop is uniformly distributed on the tube wall of described inner tube within the scope of 360 degree.
Preferably, described external pipe and inner tube are straight tube.
Preferably, the angle of taper scope of the described conical surface is between 75 °～145 °.
For realizing above-mentioned the second object, the present invention also provides a kind of SCR catalytic muffler, comprises shell, suction tude, carrier and steam outlet pipe, and described steam outlet pipe is the SCR catalytic muffler steam outlet pipe described in above-mentioned any one.
Preferably, described enclosure is divided into ante-chamber, intermediate cavity and back cavity; The outlet side of described suction tude is communicated with intermediate cavity, and described intermediate cavity is communicated with ante-chamber, and described ante-chamber is communicated with the inlet end of carrier, and the outlet side of described carrier is communicated with back cavity, and described back cavity is communicated with the inlet end of steam outlet pipe; The inlet end of described suction tude and the outlet side of steam outlet pipe are positioned at the same side of described shell.
Preferably, described enclosure is divided into ante-chamber, intermediate cavity and back cavity; The outlet side of described suction tude is communicated with intermediate cavity, and described intermediate cavity is communicated with back cavity, and described back cavity is communicated with the inlet end of carrier, and the outlet side of described carrier is communicated with ante-chamber, and described ante-chamber is communicated with the inlet end of steam outlet pipe; The inlet end of described suction tude and the outlet side of steam outlet pipe are positioned at the both sides of described shell.
SCR catalytic muffler steam outlet pipe provided by the invention is two-layer pipe, by the external pipe connecting by conical surface transition and inner tube, formed, wherein not perforate of external pipe, to guarantee sealability, inner tube arranges open-celled structure in the circumferential scope of 360 degree, i.e. the first bloop, by to first optimal design of bloop structure and the computational analysis of flowing dynamics, can reach good soundproof effect, filling sucting sound material in cavity in the middle of external pipe and inner tube simultaneously, the straight length of steam outlet pipe is longer, can fill more sound-absorbing material, therefore can effectively play the effect of noise elimination, can significantly improve the noise elimination noise reduction effect of SCR catalytic muffler.
In a kind of preferred version, on the conical surface of described external pipe and inner tube outlet side, offer the second bloop.By the second bloop is set, can make more gas by the silencing cotton between external pipe and inner tube, thereby further improve noise elimination noise reduction effect, can prevent from forming dead space simultaneously, avoid gas can not flow in interlayer.
SCR catalytic muffler provided by the invention is provided with described steam outlet pipe, and because described steam outlet pipe has above-mentioned technique effect, the SCR catalytic muffler that is provided with this steam outlet pipe also possesses corresponding technique effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing SCR catalytic muffler;
Fig. 2 is the structural representation of SCR catalytic muffler steam outlet pipe provided by the present invention;
Fig. 3 is the structural representation of the SCR catalytic muffler of suction tude and steam outlet pipe homonymy layout;
Fig. 4 is the gas flow schematic diagram of the inside of SCR catalytic muffler shown in Fig. 3;
Fig. 5 is the structural representation of the SCR catalytic muffler of suction tude and steam outlet pipe heteropleural layout.
In Fig. 1:
Suction tude 1 ＇ steam outlet pipe 2 ＇
In Fig. 2 to Fig. 5:
1. external pipe 2. inner tube 3. conical surface 4. first bloop 5. second bloop 6. suction tude 7. steam outlet pipe 8. shell 9. front shroud 10. front screen 11. backboard 12. back shroud 13. ante-chamber 14. intermediate cavity 15. back cavities
Embodiment
Core of the present invention is to provide a kind of steam outlet pipe structure of double-deck straight length and the SCR catalytic muffler of integrated this steam outlet pipe, to reach the object of noise elimination noise reduction.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 2, Fig. 2 is the structural representation of SCR catalytic muffler steam outlet pipe provided by the present invention.
In a kind of embodiment, SCR catalytic muffler steam outlet pipe provided by the invention is double layer construction, mainly external pipe 1 and inner tube 2, consists of.
The two ends of inner tube 2 are with respect to the inside indentation certain distance of external pipe 1, and be connected by the conical surface 3 transition with the two ends of external pipe 1 respectively, filling sucting sound material in cavity in the middle of external pipe 1 and inner tube 2, as silencing cotton (not shown), on the tube wall of inner tube 2, within the scope of 360 degree, offer some equally distributed the first bloops 4, the first bloop 4 is connected with the cavity between external pipe 1 and inner tube 2, and porous type pipeline configuration can reach good soundproof effect.
On the conical surface of external pipe 1 and inner tube 2 outlet sides, offer the second bloop 5, the aperture of the second bloop 5 is obviously greater than the aperture of the first bloop 4, by the second bloop 5, can make more gas by the silencing cotton between external pipe 1 and inner tube 2, thereby further improve noise elimination noise reduction effect, can prevent from forming dead space, avoid gas can not flow in interlayer simultaneously.
Above-mentioned external pipe 1 and inner tube 2 are straight tube, and the angle of taper scope of the conical surface 3 can be controlled between 75 °～145 ° between the two, and the length of external pipe 1 is 3～5 times of inner tube 2 diameters, to guarantee that it can fill enough silencing cottons.
By changing the perforate situation of inner two baffle plates of SCR catalytic muffler, can change gas flow direction, make air-flow pass through from steam outlet pipe, to flow out SCR catalytic muffler after catalyzer, to mate this double-deck steam outlet pipe, its suction port and air outlet can homonymy be arranged or heteropleural layout etc.
Please refer to Fig. 3, Fig. 4, Fig. 3 is the structural representation of the SCR catalytic muffler of suction tude and steam outlet pipe homonymy layout; Fig. 4 is the gas flow schematic diagram of the inside of SCR catalytic muffler shown in Fig. 3.
As shown in the figure, suction tude 6 and the steam outlet pipe 7 of this SCR catalytic muffler are positioned at the same side, and its shell 8 inside are separated into ante-chamber 13, intermediate cavity 14 and back cavity 15 by front shroud 9, front screen 10, backboard 11, back shroud 12.
Therefore gas flow as shown by arrows in FIG.: suction port → suction tude 6 → intermediate cavity 14 → ante-chamber 13 → carrier → back cavity, 15 → steam outlet pipe 7 → air outlet.
Above-mentioned carrier is provided with catalyzer, plays catalysis, and for cylindrical, across intermediate cavity, wall is airtight, can only pass in and out gas from two ends.
Please refer to Fig. 5, Fig. 5 is the structural representation of the SCR catalytic muffler of suction tude and steam outlet pipe heteropleural layout.
As shown in the figure, for heteropleural, enter the SCR catalytic muffler of air outlet structure, front screen 10 not perforates, backboard 11 perforates, intermediate cavity 14 and back cavity 15 are directly communicated with, and gas arrives ante-chamber 13 by carrier after entering back cavity 15 by intermediate cavity 14, discharge SCR catalytic muffler afterwards through steam outlet pipe 7.
During work, gas flow direction is: suction port → suction tude 6 → intermediate cavity 14 → back cavity 15 → carrier → ante-chamber, 13 → steam outlet pipe 7 → air outlet.
Above-mentioned steam outlet pipe 7 is two-layer pipe filling sucting sound material, this structure has good noise elimination function, simultaneously by this structure applications to integrated form SCR catalytic muffler, whether perforate by two baffle plates in the middle of SCR catalytic muffler changes the sequence of flow of tail gas in each region, mate various air inlet/outlet setting types, reach good soundproof effect.
Certainly, above-described embodiment is only preferred version of the present invention, is specifically not limited to this, can make according to actual needs on this basis pointed adjustment, thereby obtain different mode of executions.For example, the suction tude of SCR catalytic muffler and steam outlet pipe are arranged vertically, or make both there is certain angle etc.Because mode in the cards is more, just illustrate no longer one by one here.
Above SCR catalytic muffler provided by the present invention and steam outlet pipe thereof are described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand core concept of the present invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a SCR catalytic muffler steam outlet pipe, it is characterized in that, comprise external pipe (1) and inner tube (2), the two ends of described inner tube (2) are connected by the conical surface (3) transition with the two ends of described external pipe (1) respectively, filling sucting sound material in cavity between described external pipe (1) and inner tube (2), offers the first bloop (4) being communicated with described cavity on the tube wall of described inner tube (2).
2. SCR catalytic muffler steam outlet pipe according to claim 1, is characterized in that, the described conical surface (3) is inner conical surface.
3. SCR catalytic muffler steam outlet pipe according to claim 2, is characterized in that, on the conical surface (3) of described external pipe (1) and inner tube (2) outlet side, offers the second bloop (5).
4. SCR catalytic muffler steam outlet pipe according to claim 3, is characterized in that, the aperture of described the second bloop (5) is greater than the aperture of described the first bloop (4).
5. according to the SCR catalytic muffler steam outlet pipe described in claim 1 to 4 any one, it is characterized in that, described the first bloop (4) is uniformly distributed on the tube wall of described inner tube (2) within the scope of 360 degree.
6. SCR catalytic muffler steam outlet pipe according to claim 5, is characterized in that, described external pipe (1) and inner tube (2) are straight tube.
7. SCR catalytic muffler steam outlet pipe according to claim 6, is characterized in that, the angle of taper scope of the described conical surface (3) is between 75 °～145 °.
8. a SCR catalytic muffler, comprises shell (8), suction tude (6), carrier and steam outlet pipe (7), it is characterized in that, described steam outlet pipe (7) is the SCR catalytic muffler steam outlet pipe described in the claims 1 to 7 any one.
9. SCR catalytic muffler according to claim 8, is characterized in that, described shell (8) inside is divided into ante-chamber (13), intermediate cavity (14) and back cavity (15);
The outlet side of described suction tude (6) is communicated with intermediate cavity (14), described intermediate cavity (14) is communicated with ante-chamber (13), described ante-chamber (13) is communicated with the inlet end of carrier, the outlet side of described carrier is communicated with back cavity (15), and described back cavity (15) is communicated with the inlet end of steam outlet pipe (7);
The outlet side of the inlet end of described suction tude (6) and steam outlet pipe (7) is positioned at the same side of described shell (8).
10. SCR catalytic muffler according to claim 8, is characterized in that, described shell (8) inside is divided into ante-chamber (13), intermediate cavity (14) and back cavity (15);
The outlet side of described suction tude (6) is communicated with intermediate cavity (14), described intermediate cavity (14) is communicated with back cavity (15), described back cavity (15) is communicated with the inlet end of carrier, the outlet side of described carrier is communicated with ante-chamber (13), and described ante-chamber (13) is communicated with the inlet end of steam outlet pipe (7);
The outlet side of the inlet end of described suction tude (6) and steam outlet pipe (7) is positioned at the both sides of described shell (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310727432.8A CN103742242B (en) | 2013-12-25 | 2013-12-25 | A kind of SCR catalytic muffler and escape pipe thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310727432.8A CN103742242B (en) | 2013-12-25 | 2013-12-25 | A kind of SCR catalytic muffler and escape pipe thereof |
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| Publication Number | Publication Date |
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| CN103742242A true CN103742242A (en) | 2014-04-23 |
| CN103742242B CN103742242B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310727432.8A Active CN103742242B (en) | 2013-12-25 | 2013-12-25 | A kind of SCR catalytic muffler and escape pipe thereof |
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| CN (1) | CN103742242B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257381A (en) * | 2015-09-30 | 2016-01-20 | 潍柴动力股份有限公司 | Selective catalytic reduction (SCR) system, catalytic silencer of system and welding method for catalytic silencer |
| CN107905873A (en) * | 2017-11-15 | 2018-04-13 | 南京航空航天大学 | Meet the Novel heavy-truck after-treatment system and method for national 6th stage emission standard |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102507A (en) * | 1980-12-16 | 1982-06-25 | Nippon Radiator Co Ltd | Muffler |
| US6267199B1 (en) * | 1999-10-15 | 2001-07-31 | Sound Ware Industry Co., Ltd. | Automobile exhaust tube |
| KR20100023342A (en) * | 2008-08-21 | 2010-03-04 | 현대자동차주식회사 | Muffler and exhaust apparatus provided with the same |
| CN203098010U (en) * | 2013-03-01 | 2013-07-31 | 西安秦泰汽车配件有限公司 | Catalysis silencer |
| CN203347898U (en) * | 2013-07-08 | 2013-12-18 | 潍柴动力股份有限公司 | Integrated selective catalytic reduction (SCR) catalytic silencer |
| CN203717096U (en) * | 2013-12-25 | 2014-07-16 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) catalysis silencer and exit pipe thereof |
-
2013
- 2013-12-25 CN CN201310727432.8A patent/CN103742242B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102507A (en) * | 1980-12-16 | 1982-06-25 | Nippon Radiator Co Ltd | Muffler |
| US6267199B1 (en) * | 1999-10-15 | 2001-07-31 | Sound Ware Industry Co., Ltd. | Automobile exhaust tube |
| KR20100023342A (en) * | 2008-08-21 | 2010-03-04 | 현대자동차주식회사 | Muffler and exhaust apparatus provided with the same |
| CN203098010U (en) * | 2013-03-01 | 2013-07-31 | 西安秦泰汽车配件有限公司 | Catalysis silencer |
| CN203347898U (en) * | 2013-07-08 | 2013-12-18 | 潍柴动力股份有限公司 | Integrated selective catalytic reduction (SCR) catalytic silencer |
| CN203717096U (en) * | 2013-12-25 | 2014-07-16 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) catalysis silencer and exit pipe thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257381A (en) * | 2015-09-30 | 2016-01-20 | 潍柴动力股份有限公司 | Selective catalytic reduction (SCR) system, catalytic silencer of system and welding method for catalytic silencer |
| CN107905873A (en) * | 2017-11-15 | 2018-04-13 | 南京航空航天大学 | Meet the Novel heavy-truck after-treatment system and method for national 6th stage emission standard |
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| Publication number | Publication date |
|---|---|
| CN103742242B (en) | 2016-05-11 |
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