CN202431338U - Catalytic conversion muffler of diesel engine - Google Patents
Catalytic conversion muffler of diesel engine Download PDFInfo
- Publication number
- CN202431338U CN202431338U CN2011205746871U CN201120574687U CN202431338U CN 202431338 U CN202431338 U CN 202431338U CN 2011205746871 U CN2011205746871 U CN 2011205746871U CN 201120574687 U CN201120574687 U CN 201120574687U CN 202431338 U CN202431338 U CN 202431338U
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- China
- Prior art keywords
- cavity
- carrier
- catalyst
- porous
- outlet pipe
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Abstract
The utility model discloses a catalytic conversion muffler of a diesel engine, which has good flow properties, moderate pressure drop and also a muffling function. The catalytic conversion muffler of the diesel engine comprises a porous gas intake pipe, a porous baffle, a porous gas outlet plate, a gas outlet pipe, a front end cap, a front cavity, a carrier cavity, a rear cavity and a rear end cap, wherein the front end cap, the front cavity, the carrier cavity, the rear cavity and the rear end cap are connected in sequence, and a catalyst carrier is arranged in the carrier cavity and is coated with a catalyst. The catalytic conversion muffler of the diesel engine is characterized in that the porous gas intake pipe is suspended in the front cavity, and the suspension end of the porous gas intake pipe is connected with the porous baffle; the porous gas outlet plate is arranged in the rear cavity, the rear cavity is divided into an inner cavity adjacent to the carrier cavity and an outer cavity adjacent to the rear end cap, and the porous gas outlet plate is provided with a plurality of through holes; and the gas outlet pipe is inserted into the rear cavity through the end face of the rear end cap and is communicated with the inner cavity of the rear cavity, and the gas outlet pipe is provided with a plurality of through holes in the outer cavity part of the rear cavity.
Description
Technical field
The utility model relates to the automobile exhaust system field, relates in particular to a kind of automobile SCR after-treatment system, relates to a kind of diesel catalyst in particular and transforms silencing apparatus.
Background technique
Diesel engine is all having remarkable advantages than petrol engine aspect power character, Economy and the reliability, particularly CO
2Discharge lowly, its purposes expands on all kinds of vehicles gradually.But it is nitrogen oxide (NO that there is maximum problem in diesel engine
x) and particulate matter (PM) discharging seriously.Along with Chinese emission control regulations are more and more tighter, and homemade DENG performance and oil product problem, depend the emission controls by improving combustion measure alone and seem unable to do what one wishes, therefore be necessary to take the outer after-treatment device of machine to reach emissions object.
Diesel motor exhaust SCR technology (SCR) is the outer post-processing technology of a kind of machine of vehicle diesel engine, can effectively improve diesel engine NO
xDischarging, and insensitive to the diesel oil sulphur content.This technology is through spraying into certain density urea liquid, the NH that after pyrolysis (reaction 1) and hydrolysis (reaction 2), produces in outlet pipe
3And NO
xReduction reaction (reaction 3-5) takes place in catalytic converter, with NO
xBe converted into H
2O and N
2
(NH
2)
2CO→NH
3+HNCO (1)
H
2O+HNCO→NH
3+CO
2 (2)
4NO+4NH
3+O
2→4N
2+6H
2O (3)
2NH
3+NO+NO
2→2N
2+3H
2O (4)
6NO
2+8NH
3→7N
2+12H
2O (5)
For the main evaluation index of the catalytic converter that is used for the diesel engine vent gas processing, can estimate by following index:
1, the distribution of fluid between each catalyst carrier and the flow uniformity value of each catalyst carrier front-end face.
Improve the mass flow distribution of tail gas between each catalyst carrier, help improving the utilization ratio of carried catalyst, improve the transformation efficiency of catalyzer; Help reducing the pressure loss of air-flow on catalyst carrier; Help catalyst carrier and reach initiation temperature faster.
2, the pressure loss of system
A part of whole vent systems during the pressure loss of catalytic converter, the pressure loss that reduces catalytic converter helps reducing the back pressure of vent systems, thereby helps improving the performance of motor.
3, air speed
The size of air speed has been reacted the waiting time of air-flow on catalyst carrier.Air speed is more little, and the waiting time of air-flow in catalyst carrier is long more, and transformation efficiency is just high more.
4, acoustic insertion loss
Summary of the invention
The purpose of the utility model is to provide a kind of good flowing properties, crushing moderate, and has noise elimination function, is used for the after-treatment device that vehicle exhaust is handled.
In order to address the above problem, the technological scheme that this patent adopts is:
A kind of diesel catalyst transforms silencing apparatus; Comprise porous suction tude, perforated baffle, the porous slab of giving vent to anger, steam outlet pipe and the front cover, preceding cavity, carrier cavity, rear chamber and the rear end cover that connect successively; In described carrier cavity, be provided with catalyst carrier; On described catalyst carrier, be coated with catalyzer; It is characterized in that described porous suction tude suspends in the preceding cavity of front cover end face insertion, its end that suspends connects described perforated baffle, and the part that described porous suction tude is positioned at described preceding cavity is provided with a plurality of perforation; The described porous slab of giving vent to anger is arranged in the described rear chamber, and described rear chamber is separated into inner chamber adjacent with described carrier cavity and the exocoel adjacent with said rear end cover, and the described porous slab of giving vent to anger is provided with a plurality of perforation; Described steam outlet pipe from the rear end cover end face insert in the rear chamber and with the inner chamber UNICOM of rear chamber, the outer cavity segment that described steam outlet pipe is positioned at rear chamber is provided with a plurality of perforation.
The utility model suction tude is provided with perforation; And the cavity end that suspends is provided with perforated baffle before suction tude is positioned at; Thereby make air-flow after getting into suction tude; From perforation, be discharged into uniformly before the catalyst converter in the cavity, most of fluid of avoiding the free end opening to be caused directly flows out from the suction tude bottom, causes fluid distribution inhomogeneous.The perforated baffle of suction tude tail end keeps certain distance with urging carrier cavity end face; A part of air-flow before guaranteeing in the cavity can flow to catalyst carrier through this space; Avoid causing mobile blind area, make to obtain higher distribution of gas uniformity on the catalyst carrier in the suction tude end edge region.Analyze through FLUENT special designs computed in software, the back pressure that this structure produces is smaller, reaches both to make air-flow distributing homogeneity before catalyst carrier improve, and can not produce the purpose of very big pressure drop again.Simultaneously, the perforated design of suction tude, steam outlet pipe, give vent to anger porous slab and perforated baffle has played good noise elimination effect, has effectively reduced the noise of system.
According to the utility model, described porous suction tude is parallel to catalyst carrier arranges, and suction tude is provided with the circumferential equally distributed perforation of 360 degree, when effectively eliminating the noise, can also guarantee air-flow in the suction tude flow to uniformly before cavity.
According to the utility model, described diesel catalyst transforms silencing apparatus, it is characterized in that the inner of described gas outlet tube is provided with horn mouth, and steering flow gets into outer pipe effectively.
According to the utility model, connect through anchor ear between each cavity, whole catalyzed conversion silencing apparatus is connected with exhaust duct through adpting flange, is easy to install and can in time changes the carrier cavity of damage like this.
According to the utility model, the carrier cavity is arranged between air-inlet cavity and the outlet chamber, is provided with catalyst carrier in the carrier cavity, and described catalyst carrier comprises carrier, is coated on the outer liner of carrier and is coated on the outer shell of liner.Described carrier is a cylindrical structural, is provided with many parallel channels in the carrier vertically and runs through both ends of the surface, and the internal surface of each passage is provided with catalyst coat.Shell and liner can be protected and holding carrier, prevent that carrier lost efficacy at work.
The catalyzed conversion baffler of a kind of diesel engine after-treatment device of the utility model shows that it has good flowing properties, moderate advantage and the characteristics of crushing, and has the noise elimination effect of silencing apparatus through computational fluid mechanics (CFD) flow analysis and acoustic analysis demonstration.
Description of drawings
Fig. 1 transforms the silencing apparatus schematic representation for the utility model diesel catalyst.
Fig. 2 is the rear end cover structural representation.
Fig. 3 is the perforated baffle structural representation.
Fig. 4 is the perforated plate construction schematic representation of giving vent to anger.
Fig. 5 is a carrier chamber body structure schematic representation.
Be labeled as among the figure: 1, preceding cavity; 2, rear chamber; 3, adpting flange; 4, porous suction tude; 5, front cover; 6, air intake casing; 7, perforated baffle; 8, carrier cavity; 9, the housing of giving vent to anger; 10, the porous slab of giving vent to anger; 11, steam outlet pipe; 12, rear end cover; 13, anchor ear; 14, anchor ear; 201, the inner chamber of rear chamber; 202, the exocoel of rear chamber; 401, the perforation on the porous suction tude; 701, the perforation on the perforated baffle; 801, carrier; 802, liner; 803, shell; 804, passage; 1001, the give vent to anger perforation of porous slab; 1101, the vent on the steam outlet pipe; 1102, the horn mouth of steam outlet pipe.
Embodiment
Contrast accompanying drawing below; Through description to embodiment; To the embodiment of this patent, for example: the effect of mutual alignment relation between the shape of structure, structure and the each several part and annexation, each several part and working principle etc. are done further detailed explanation:
Of Fig. 1; The diesel catalyst of the utility model transforms silencing apparatus; Comprise porous suction tude 4, air intake casing 6, preceding cavity 1, carrier cavity 8, rear chamber 2, front cover 5, rear end cover 12, the housing 9 of giving vent to anger, steam outlet pipe 11 and connect anchor ear 13; 14 with adpting flange 3, on porous suction tude 4, offer 360 the degree circumferential equally distributed perforation 401, said porous suction tude 4 be positioned at before cavity 1 a unsettled end perforated baffle 7 is set.Be provided with catalyst carrier in the described carrier cavity 8, the porous slab 10 of giving vent to anger is set in the catalyst carrier rear end, this porous slab 10 is separated into inner chamber 201 adjacent with described carrier cavity 8 and the exocoel 202 adjacent with said rear end cover 12 with described rear chamber 2.On steam outlet pipe 11, offer the circumferential equally distributed perforation 1101 of 360 degree.
Be connected with 13 through anchor ear 14 respectively between cavity 1, carrier cavity 8, the rear chamber 2 before described.Whole catalyzed conversion silencing apparatus is connected with exhaust duct through adpting flange 3.
Referring to Fig. 1 and Fig. 3; Described porous suction tude 4 unsettled being arranged in the described preceding cavity 1; Its bottom is provided with perforated baffle 7; Offer equally distributed perforation 701 on the perforated baffle 7, most of fluid of avoiding the free end opening to be caused directly flows out from the suction tude bottom, causes fluid distribution inhomogeneous.
Described perforated baffle 7 maintains certain distance with carrier cavity 8 end faces, thereby the fluid in the cavity 1 can be avoided producing the blind area of flowing in this zone through the perforated baffle 7 of suction tude bottom and the zone between carrier cavity 8 end faces before making.
Described steam outlet pipe 11 successively from the rear end cover 12 and the porous slab 10 of giving vent to anger pass and extend in the rear chamber 2 and with described inner chamber 201 UNICOMs, a plurality of perforation 1101 on the steam outlet pipe 11 all are arranged in the exocoel 202 of rear chamber 2, have also played certain noise elimination effect.Be provided with horn mouth 1102 in the inner of steam outlet pipe 11.
Referring to Fig. 5, be provided with catalyst carrier in the carrier cavity 8, described catalyst carrier comprises carrier 801, is coated on the liner 802 outside the carrier 801 and is coated on the shell outside the liner 802.Carrier 801 is a cylindrical structural, be provided with vertically in the carrier 801 many parallel and run through the passage 804 of both ends of the surface, the internal surface of each passage 804 is provided with catalyst coat.Shell 803 can be protected and holding carrier 801 with liner 802, prevents that carrier lost efficacy at work.
The working principle that the utility model diesel catalyst transforms silencing apparatus can combine Fig. 1 to explain as follows:
Diesel motor exhaust gets into porous suction tude 4; Get into air-inlet cavitys 1 through the perforation on perforation on the porous suction tude 4 401 and the perforated baffle 7 701; The carrier cavity 8 of flowing through after air-flow is recombinated in air-inlet cavity 1, chemical reaction takes place to reduce nitrogen oxide at this in its each composition.After the vehicle treated of air-flow in carrier cavity 8, be divided into two-way behind the inner chamber 201 of entering rear chamber 2: one road horn mouths 1102 from steam outlet pipe 11 the inners get into steam outlet pipes 11; Another road gets into exocoel 202 through the perforation on the porous slab 10 of giving vent to anger 1001, gets into steam outlet pipe 11 through the perforation on the steam outlet pipe 11 1101 then.Last air-flow flows out from the tail pipe of steam outlet pipe 11.Perforation on suction tude 4, perforated baffle 7 and the steam outlet pipe 11 all has noise elimination function.
What should be understood that is: the foregoing description is just to the explanation of the utility model, rather than to the restriction of the utility model, any model utility that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the utility model.
Claims (6)
1. a diesel catalyst transforms silencing apparatus; Comprise porous suction tude (4), perforated baffle (7), the porous slab of giving vent to anger (10), steam outlet pipe (11) and the front cover (5), preceding cavity (1), carrier cavity (8), rear chamber (2) and the rear end cover (12) that connect successively; In described carrier cavity (8), be provided with catalyst carrier; On described catalyst carrier, be coated with catalyzer; It is characterized in that described porous suction tude (4) suspends in the preceding cavity (1) of front cover (5) end face insertion, its end that suspends connects described perforated baffle (7), and the part that described porous suction tude (4) is positioned at described preceding cavity (1) is provided with a plurality of perforation (401); The described porous slab of giving vent to anger (10) is arranged in the described rear chamber (2); And described rear chamber (2) is separated into inner chamber (201) adjacent with described carrier cavity (8) and the exocoel (202) adjacent with said rear end cover (12), the described porous slab of giving vent to anger (10) is provided with a plurality of perforation (1001); Described steam outlet pipe (11) from rear end cover (12) end face insert in the rear chamber (2) and with inner chamber (201) UNICOM of rear chamber (2), exocoel (202) part that described steam outlet pipe (11) is positioned at rear chamber (2) is provided with a plurality of perforation (1101).
2. transform silencing apparatus according to right 1 described a kind of diesel catalyst, it is characterized in that described porous suction tude (4) is parallel to catalyst carrier and arranges.
3. transform silencing apparatus according to right 1 described a kind of diesel catalyst, it is characterized in that the perforation (401) on described porous suction tude (4) is the circumferentially even layout of 360 degree.
4. transform silencing apparatus according to right 1 described a kind of diesel catalyst, it is characterized in that the inner of described steam outlet pipe (11) is provided with horn mouth (1102).
5. transform silencing apparatus according to right 1 described a kind of diesel catalyst, it is characterized in that described preceding cavity (1) is connected through first anchor ear (14) with carrier cavity (8), described carrier cavity (8) is connected through second anchor ear (13) with rear chamber (2).
6. transform silencing apparatus according to any one described a kind of diesel catalyst of right 1-5, it is characterized in that whole SCR catalyzed conversion silencing apparatus is connected with exhaust duct through adpting flange (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205746871U CN202431338U (en) | 2011-12-31 | 2011-12-31 | Catalytic conversion muffler of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205746871U CN202431338U (en) | 2011-12-31 | 2011-12-31 | Catalytic conversion muffler of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202431338U true CN202431338U (en) | 2012-09-12 |
Family
ID=46780795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205746871U Expired - Lifetime CN202431338U (en) | 2011-12-31 | 2011-12-31 | Catalytic conversion muffler of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202431338U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562224A (en) * | 2011-12-31 | 2012-07-11 | 杭州银轮科技有限公司 | Catalytic conversion muffler of diesel engine |
| CN105317507A (en) * | 2014-07-01 | 2016-02-10 | 中国科学院过程工程研究所 | Damping type exhaust silencer |
| CN106121774A (en) * | 2016-07-25 | 2016-11-16 | 南京航空航天大学 | A kind of low noise combined type multi-cavity exhaust silencer |
| US9976460B2 (en) | 2016-03-24 | 2018-05-22 | Caterpillar Inc. | Exhaust after-treatment assembly for engine system |
-
2011
- 2011-12-31 CN CN2011205746871U patent/CN202431338U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562224A (en) * | 2011-12-31 | 2012-07-11 | 杭州银轮科技有限公司 | Catalytic conversion muffler of diesel engine |
| CN105317507A (en) * | 2014-07-01 | 2016-02-10 | 中国科学院过程工程研究所 | Damping type exhaust silencer |
| US9976460B2 (en) | 2016-03-24 | 2018-05-22 | Caterpillar Inc. | Exhaust after-treatment assembly for engine system |
| CN106121774A (en) * | 2016-07-25 | 2016-11-16 | 南京航空航天大学 | A kind of low noise combined type multi-cavity exhaust silencer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |
|
| CX01 | Expiry of patent term |