CN102465731B - The tail-gas purifying silencer of internal combustion engine - Google Patents
The tail-gas purifying silencer of internal combustion engine Download PDFInfo
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- CN102465731B CN102465731B CN201010534742.4A CN201010534742A CN102465731B CN 102465731 B CN102465731 B CN 102465731B CN 201010534742 A CN201010534742 A CN 201010534742A CN 102465731 B CN102465731 B CN 102465731B
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- air supply
- supply passage
- exhaust emission
- catalyst converter
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Abstract
The tail-gas purifying silencer that the invention provides a kind of internal combustion engine, comprising: anechoic chamber, and inside has silencing cavity; Exhaust emission pipeline, extends in the silencing cavity of anechoic chamber; The first catalyst converter and the second catalyst converter, set gradually along gas flow direction in the exhaust emission pipeline in silencing cavity; And air supply passage, being arranged between the first catalyst converter and the second catalyst converter, the front end of air supply passage stretches in exhaust emission pipeline, wherein, the downstream direction of the outlet of air supply passage exhaust gas flow in exhaust emission pipeline. Even under the middle and high load dynamic condition of motorcycle, when waste gas presents high exhaust back pressure, high exhaust flow rate in silencer, also can realize secondary air compensating, improve the transformation efficiency of catalyst converter.
Description
Technical field
The present invention relates to internal combustion engine, more specifically, relate to a kind of tail-gas purifying silencer of the internal combustion engine that can reduce exhaust emissions.
Background technology
Internal combustion engine in the course of the work, due to combustion, can give off large quantity of exhaust gas, has increased air pollution. General locatesReason method is, in the exhaust emission pipeline in the silencer of internal combustion engine, catalyst converter is set, and carries out vent gas treatment by catalyst converter,Reduce the harmful components such as CO, NOx, HC in waste gas.
Exhaust environment (air-fuel ratio) is one of key link determining catalyst converter transformation efficiency, and air-fuel ratio refers in fuel-air mixtureThe ratio of contained air and fuel oil, in general engine operation environment, optimal air-fuel ratio is 14.7: 1, i.e. Lambda=1. As Fig. 1Shown in, analyze by oxidation-reduction type catalyst converter air-fuel ratio performance data by typical motorcycle, can find out, Lambda existsBetween 0.9～1.0 time, catalyst converter is in high transformation efficiency interval. In internal combustion engine tail gas discharge process, because waste gas flow velocity is higher, withBe restricted the time of contact on catalyst converter surface, and the changing effect of single-stage catalyst converter is unsatisfactory, if increase the size of catalyst converter,The exothermic process of catalyst converter reaction is too violent, and the tolerance degree of catalyst converter carrier is difficult to support, and will cause catalyst converter damage;Simultaneously, in the course of reaction of waste gas and catalyst converter, oxygen content sharply declines, along with the reduction of oxygen content, and catalyst converter later halfThe high transformation efficiency interval that section course of reaction will depart from catalyst converter, causes transformation efficiency to reduce.
For head it off, the technical scheme of existing use two-stage or multistage catalyst converter, by arranging tonifying Qi before the catalyst converter of the second levelPassage carries out auxiliary air and imports and add oxygen, by with first order catalyst converter after the optimization of exhaust environment, can make exhaust environment extensiveThe multiple Lambda interval to the high transformation efficiency of catalyst converter, improves waste gas transformation efficiency, and the importing of fresh air has simultaneously reduced uselessTemperature degree, is conducive to reduce the thermic load of second level catalyst converter.
In prior art, air supply passage stretches into the schematic diagram of exhaust emission pipeline as can see from Figure 2. Secondary of the prior artIt is more difficult that tonifying Qi mode combustion motor carries out tonifying Qi under middle and high load dynamic condition, and reason is that the middle and high load of internal combustion engine is movingUnder state condition, exhaust back pressure sharply raises, and cannot form intermittent negative pressure and open the one-way leaf valve of air supply passage rear end, fresh skyGas can not enter in silencer. In the middle and high load dynamic operation condition stage, be also internal combustion engine high exhaust gas discharge phase, now blast pipeThe air-fuel ratio in road is in the partially dense stage, and the transformation efficiency of first order catalyst converter is undesirable, if secondary air compensating can not be by exhaust environmentBe improved to the high transformation efficiency interval of second level catalyst converter, the transformation efficiency of second level catalyst converter equally can be very low, can not reach largeWidth reduces the object of harmful substance in waste gas.
The control technology of current locomotive oil supply system, can be controlled at the Lambda of most of operating mode between 0.9～1.0, butBe the Lambda of boost phase operating mode lower than 0.9, reason is vehicle in starting and accelerator, it is larger that engine need to provideOutputting power, meet the demand of acceleration.
Open day is on September 28th, 2005, discloses a kind of " at machine in the Chinese invention patent that publication number is CN1673496AIn vehicle exhaust pipe, improve the method for catalytic control nitrogen oxide efficiency ". This patent is to utilize secondary air-supplying device to mend in discharge ductGas, improves the transformation efficiency of catalyst converter with this, but internal combustion engine locomotive exhaust back pressure under middle and high load dynamic condition sharply raises,Can cause tonifying Qi difficulty, cannot under full working condition, improve catalyst converter transformation efficiency. Particularly, in this patent, having mentioned willSecondary air control valve is installed in the negative pressure end of engine or carburetor, accepts intermittent negative-pressure sucking and the mode that operates, andAdopt electrodynamic pump to force the mode of purt gas to carry out tonifying Qi, but this two schemes is all by the tail gas row to high exhaust back pressure by forcePut the mode of tonifying Qi in pipe, fundamentally do not solve especially under the middle and high loading condiction of internal combustion engine, in exhaust emission pipelineThe problem that exhaust back pressure is high.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of middle and high load condition at internal combustion engine also can carry out secondary air compensating fromAnd make the tail-gas purifying silencer of the internal combustion engine that catalyst converter transformation efficiency is higher.
According to an aspect of the present invention, provide a kind of tail-gas purifying silencer of internal combustion engine, having comprised: anechoic chamber, inner toolThere is silencing cavity; Exhaust emission pipeline, extends in the silencing cavity of anechoic chamber; The first catalyst converter and the second catalyst converter, in silencing cavityIn exhaust emission pipeline in set gradually along gas flow direction; And air supply passage, be arranged on the first catalyst converter and second and urgeChange between device, the front end of air supply passage stretches in exhaust emission pipeline, and wherein, the outlet of air supply passage is towards exhaust emission pipelineThe downstream direction of middle exhaust gas flow.
Further, also comprise valve control device, be arranged on the rear end of air supply passage, for controlling air supply passage by rear end forward endUnidirectional opening or closing.
Further, the part that is arranged in exhaust emission pipeline of air supply passage has the bending segment extending along exhaust gas flow direction.
Further, the part outside exhaust emission pipeline of being positioned at of air supply passage also has to extend and be positioned at along exhaust gas flow direction and disappearsThe second bending segment in the silencing cavity of tone chamber.
Further, air supply passage there is the bending segment being bent to form towards exhaust gas flow direction, bending segment tilts to stretch into tail gasIn discharge tube.
Further, the exit end face of bending segment is perpendicular to the bearing of trend of exhaust emission pipeline.
Further, the bending segment of air supply passage stretches in the arc section of exhaust emission pipeline, and the axis of this bending segment withThe axis of exhaust emission pipeline is tangent.
Further, air supply passage at least extend into the position near exhaust emissions passage central authorities.
Further, valve control device is one-way leaf valve.
The present invention has following technique effect:
Owing to streaming principle, air-flow flows along air supply passage surface, near arriving its summit (90 degree), has just left wall,Fluid after separation forms for example a pair of fixed symmetrical whirlpool (adhering to whirlpool) in air supply passage downstream, thereby forms in downstreamA low-pressure area, like this, due to the downstream direction of air supply passage outlet exhaust gas flow in exhaust emission pipeline, namely courtTo this low-pressure area, make it possible to easily fill into air, improve exhaust environment, improve the transformation efficiency of catalyst converter, and then reduceExhaust emissions.
Brief description of the drawings
Figure of description is used to provide a further understanding of the present invention, forms the application's a part, schematic reality of the present inventionExecute example and explanation thereof for explaining the present invention, do not form inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 shows the analysis of typical motorcycle oxidation-reduction type catalyst converter air-fuel ratio performance data;
Fig. 2 shows air supply passage in prior art and stretches into the schematic diagram of exhaust emission pipeline;
Fig. 3 shows according to the structural representation of the tail-gas purifying silencer of the internal combustion engine of the first embodiment of the present invention;
Fig. 4 shows the structural representation of the tail-gas purifying silencer of internal combustion engine according to a second embodiment of the present invention;
Fig. 5 shows according to air supply passage in the tail-gas purifying silencer of the internal combustion engine of the first embodiment of the present invention and stretches into tail gas rowPut the schematic diagram of pipeline;
Fig. 6 shows air supply passage in the tail-gas purifying silencer of internal combustion engine according to a second embodiment of the present invention and stretches into tail gas rowPut the schematic diagram of pipeline.
Detailed description of the invention
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
As shown in Figure 3, comprise anechoic chamber 6, tail gas row according to the tail-gas purifying silencer of the internal combustion engine of the first embodiment of the present inventionPut pipeline 1, the first catalyst converter 2, the second catalyst converter 7 and air supply passage 3. Wherein, the inside of anechoic chamber 6 has silencing cavity,Exhaust emission pipeline 1 extends in the silencing cavity of anechoic chamber 6, as can be seen from the figure, in the present embodiment, tail gas discharging pipeRoad 1 has one section of arc section in silencing cavity. The first catalyst converter 2 and the tail of the second catalyst converter 7 in the silencing cavity of anechoic chamber 6In gas discharge tube 1, set gradually along gas flow direction, urge and the front end of air supply passage 3 stretches into the first catalyst converter 2 and secondChange in the exhaust emission pipeline 1 between device 7, can carry out auxiliary air importing to realize before the second catalyst converter 7, add oxygenGas, optimizes the first catalyst converter 2 exhaust environment afterwards, reduces EGT. Fig. 5 has more been shown clearly in air supply passage 3 and has stretchedEnter the schematic diagram of exhaust emission pipeline 1. Can find out in conjunction with Fig. 3 and Fig. 5, the outlet of air supply passage 3 is towards exhaust emissionsThe downstream direction of exhaust gas flow in pipeline 1. Owing to streaming principle, air-flow flows along air supply passage surface, arrives its summitNear (90 degree), just leave wall, formed a low-pressure area in downstream, like this, because the outlet of air supply passage 3 is towards tailThe downstream direction of exhaust gas flow in gas discharge tube, namely towards this low-pressure area, makes it possible to easily fill into air, improvesExhaust environment, improves the transformation efficiency of catalyst converter, and then reduces exhaust emissions. Internal combustion engine under middle and high load dynamic condition,In silencer, waste gas presents the feature of high exhaust back pressure, high exhaust flow rate, and this kind of structure of air supply passage 3 utilized above-mentioned low pressureDistrict, has overcome this defect, even if make under the middle and high load dynamic condition of internal combustion engine, in silencer, waste gas presents high exhaustAlso the catalyst converter waste gas condition of work that can realize ideal when back pressure, high exhaust flow rate. Like this, according to the tail of internal combustion engine of the present inventionCatalyst converter in gas purifying muffler air-fuel ratio space in high transformation efficiency all under full working condition.
In addition, the tail-gas purifying silencer of internal combustion engine of the present invention only adopts the side that changes simply air supply passage structure and layoutFormula, the secondary air compensating problem can solve high exhaust back pressure and high exhaust flow rate time, makes the middle and high load condition at internal combustion engineAlso can carry out secondary air compensating. With respect to patent CN1673496A by force to the mode of tonifying Qi in tail gas discharging pipe, the present invention is realNow get up simpler, and fundamentally for the high problem reason of exhaust back pressure in tail gas discharging pipe, by changing air supply passageStructure in tail gas discharging pipe and layout, directly avoided. Be appreciated that the technical solution adopted in the present invention avoidsUsual tonifying Qi mode by force of the prior art.
Preferably, the tail-gas purifying silencer of this internal combustion engine also comprises valve control device 4, and this valve control device 4 is arranged on air supply passage 3Rear end, open or close by rear end forward end is unidirectional for controlling air supply passage 3. More preferably, in the present embodiment, shouldValve control device 4 is one-way leaf valve. Even under the middle and high load dynamic condition of diesel locomotive, in silencer, waste gas presents high rowWhen gas back pressure, high exhaust flow rate, this one-way leaf valve also can rely on above-mentioned low-pressure area and open, and leads to by tonifying Qi thereby realizeRoad 3 fills into air.
In addition, as shown in Figure 3 and Figure 5, as a kind of optimal way, air supply passage 3 be arranged in exhaust emission pipeline 1Part has the bending segment extending along exhaust gas flow direction. Be appreciated that the outlet of this bending segment extending along exhaust gas flow directionThe downstream direction of exhaust gas flow in exhaust emission pipeline 1, and this pipe shape is simple and easy to make. More preferably, at thisIn embodiment, as can be seen from Figure 5, the part being positioned at outside exhaust emission pipeline 1 of air supply passage 3 also has along tail gas streamThe second bending segment of the silencing cavity of anechoic chamber is extended and be arranged in to moving direction, and the existence of this second bending segment makes this air supply passage 3Position in silencer is more flexible, can arbitrarily arrange as required that it stretches into the position of stretching into of exhaust emission pipeline 1Point. In addition, air supply passage 3 is set to have to the shape of this second bending segment, has also saved air supply passage 3 in silencerShared space.
More preferably, air supply passage 3 at least extend into the position near described exhaust emissions passage 1 central authorities, utilize largelyr aroundStream effect.
As shown in Figure 4, the tail-gas purifying silencer of internal combustion engine according to a second embodiment of the present invention with according to of the present invention firstThe tail-gas purifying silencer of the internal combustion engine of embodiment has identical formation. Difference is, logical with the tonifying Qi in the first embodimentThe arrangement difference in road 3, in the present embodiment, air supply passage 3 has the bending segment being bent to form towards exhaust gas flow direction,Bending segment tilts to stretch in exhaust emission pipeline 1, from Fig. 4 and Fig. 6 can clearly be seen that the shape of air supply passage 3 and withThe position relationship of exhaust emission pipeline 1. Preferably, in the present embodiment, the exit end face of the bending segment of air supply passage 3 is verticalIn the bearing of trend of exhaust emission pipeline, to make the efficiency of tonifying Qi reach optimum.
From shown in Fig. 6 different a bit, as a kind of embodiment, in Fig. 4, further show the bending of air supply passage 3Section stretches in the arc section of exhaust emission pipeline 1, and the axis of the axis of this bending segment and exhaust emission pipeline 1 is tangent.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art, the present invention can have various modifications and variations. Within the spirit and principles in the present invention all, any amendment of doing, etc.With replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a tail-gas purifying silencer for internal combustion engine, comprising:
Anechoic chamber (6), inside has silencing cavity;
Exhaust emission pipeline (1), extends in the silencing cavity of described anechoic chamber (6);
The first catalyst converter (2) and the second catalyst converter (7), in the described exhaust emission pipeline (1) in described silencing cavitySet gradually along gas flow direction; And
Air supply passage (3), is arranged between described the first catalyst converter (2) and the second catalyst converter (7), and described tonifying Qi is logicalThe front end in road (3) stretches in described exhaust emission pipeline (1),
It is characterized in that:
The downstream direction of the outlet of described air supply passage (3) exhaust gas flow in described exhaust emission pipeline (1);
Described tail-gas purifying silencer also comprises valve control device (4), is arranged on the rear end of described air supply passage (3), forControlling described air supply passage (3) opens or closes by rear end forward end is unidirectional;
Described air supply passage (3) has the bending segment being bent to form towards exhaust gas flow direction, and described bending segment tilts to stretch intoIn described exhaust emission pipeline (1);
The bending segment of described air supply passage (3) stretches in the arc section of described exhaust emission pipeline (1), and this bendingThe axis of section and the axis of described exhaust emission pipeline (1) are tangent.
2. the tail-gas purifying silencer of internal combustion engine according to claim 1, is characterized in that, described air supply passage (3) at leastExtend into the position near described exhaust emission pipeline (1) central authorities.
3. the tail-gas purifying silencer of internal combustion engine according to claim 1, is characterized in that, described valve control device (4) is singleTo leaf valve.
4. the tail-gas purifying silencer of internal combustion engine according to claim 2, is characterized in that, described valve control device (4) is singleTo leaf valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010534742.4A CN102465731B (en) | 2010-11-05 | 2010-11-05 | The tail-gas purifying silencer of internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010534742.4A CN102465731B (en) | 2010-11-05 | 2010-11-05 | The tail-gas purifying silencer of internal combustion engine |
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| Publication Number | Publication Date |
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| CN102465731A CN102465731A (en) | 2012-05-23 |
| CN102465731B true CN102465731B (en) | 2016-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010534742.4A Active CN102465731B (en) | 2010-11-05 | 2010-11-05 | The tail-gas purifying silencer of internal combustion engine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121077A (en) * | 2014-08-12 | 2014-10-29 | 广西玉柴机器股份有限公司 | Catalytic silencer |
| CN111810380B (en) * | 2020-06-09 | 2022-06-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Silencing device, compressor assembly comprising same and refrigerator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050473U (en) * | 1989-08-26 | 1990-01-03 | 于和平 | Automotive silencing and purifier |
| CN2257860Y (en) * | 1996-01-27 | 1997-07-16 | 钟礼晖 | Metal carrier automotive tail gas purifying silencer |
| US5804147A (en) * | 1997-02-03 | 1998-09-08 | General Motors Corporation | Exhaust gas management apparatus and method |
| CN1673496A (en) * | 2004-03-26 | 2005-09-28 | 厦门信源交通器材有限公司 | Method for raising purifying nitrogen oxide effect of catalyst in locomotive gas vent |
| CN101845981A (en) * | 2009-03-25 | 2010-09-29 | 雅马哈发动机株式会社 | Saddle-riding type vehicle |
| CN201835898U (en) * | 2010-11-05 | 2011-05-18 | 阎希成 | Tail gas purifying silencer of internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4341196B2 (en) * | 2001-04-16 | 2009-10-07 | スズキ株式会社 | Exhaust gas purification device for internal combustion engine |
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2010
- 2010-11-05 CN CN201010534742.4A patent/CN102465731B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050473U (en) * | 1989-08-26 | 1990-01-03 | 于和平 | Automotive silencing and purifier |
| CN2257860Y (en) * | 1996-01-27 | 1997-07-16 | 钟礼晖 | Metal carrier automotive tail gas purifying silencer |
| US5804147A (en) * | 1997-02-03 | 1998-09-08 | General Motors Corporation | Exhaust gas management apparatus and method |
| CN1673496A (en) * | 2004-03-26 | 2005-09-28 | 厦门信源交通器材有限公司 | Method for raising purifying nitrogen oxide effect of catalyst in locomotive gas vent |
| CN101845981A (en) * | 2009-03-25 | 2010-09-29 | 雅马哈发动机株式会社 | Saddle-riding type vehicle |
| CN201835898U (en) * | 2010-11-05 | 2011-05-18 | 阎希成 | Tail gas purifying silencer of internal combustion engine |
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| CN102465731A (en) | 2012-05-23 |
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