CN102465731A - Tail gas purification silencer of internal combustion engine - Google Patents
Tail gas purification silencer of internal combustion engine Download PDFInfo
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- CN102465731A CN102465731A CN2010105347424A CN201010534742A CN102465731A CN 102465731 A CN102465731 A CN 102465731A CN 2010105347424 A CN2010105347424 A CN 2010105347424A CN 201010534742 A CN201010534742 A CN 201010534742A CN 102465731 A CN102465731 A CN 102465731A
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- combustion engine
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Abstract
The invention provides a tail gas purification silencer of an internal combustion engine. The tail gas purification silencer of the internal combustion engine comprises a silencing chamber, a tail gas discharge pipeline, a first catalyst, a second catalyst and an air supplementing passage, wherein a silencing cavity is arranged inside the silencing chamber, the tail gas discharge pipeline extends into the silencing cavity of the silencing chamber, the first catalyst and the second catalyst are in sequence arrangement in the air flowing direction in the tail gas discharge pipeline in the silencing cavity, the gas supplementing passage is arranged between the first catalyst and the second catalyst, the front end of the air supplementing passage extends into the tail gas discharge pipeline, and an outlet of the air supplementing passage faces the tail gas flowing downstream direction in the tail gas discharge pipeline. The secondary air supplementation can still be realized even in a motorcycle under the high-load dynamic condition when the waste gas in the silencer is in a state at high exhaust back pressure and high exhaust flow speed, and the conversion efficiency of the catalysts is improved.
Description
Technical field
The present invention relates to internal-combustion engine, more specifically, relate to a kind of tail-gas purifying silencer that can reduce the internal-combustion engine of exhaust emissions.
Background technique
Internal-combustion engine because combustion can give off large quantity of exhaust gas, has increased atmospheric pollution in the course of the work.General processing method is, in the exhaust emissions pipeline in the silencing apparatus of internal-combustion engine catalyst converter is set, and carries out vent gas treatment through catalyst converter, reduces harmful components such as CO in the waste gas, NOx, HC.
Exhaust environment (air fuel ratio) is one of key link of decision catalyst converter transformation efficiency, and air fuel ratio is meant the ratio of contained air and fuel oil in the fuel-air mixture, and generally optimal air-fuel ratio is 14.7: 1 in the engine operation environment, i.e. Lambda=1.As shown in Figure 1, analyze with oxidation-reduction type catalyst converter air fuel ratio performance data through typical motorcycle, can find out, Lambda between 0.9～1.0 the time catalyst converter to be in high transformation efficiency interval.In the internal combustion engine tail gas discharge process; Because the waste gas flow velocity is higher, be restricted the time of contact surperficial with catalyst converter, 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 the catalyst converter damage; In the course of reaction of waste gas and catalyst converter, oxygen content sharply descends simultaneously, and along with the reduction of oxygen content, the second half section course of reaction of catalyst converter will depart from the high transformation efficiency interval of catalyst converter, causes transformation efficiency to reduce.
Be head it off, the existing technological scheme of using two-stage or multistage catalyst converter is carried out secondary air importing interpolation oxygen through air supply passage is set before the catalyst converter of the second level; Through with first order catalyst converter after the optimization of exhaust environment; Can make exhaust environment return to the Lambda interval of the high transformation efficiency of catalyst converter, improve the waste gas transformation efficiency, simultaneously the importing of fresh air; Reduce EGT, helped reducing the heat load of second level catalyst converter.
Can see that from Fig. 2 air supply passage in the existing technology stretches into the schematic representation of exhaust emissions pipeline.Secondary air compensating mode of the prior art is carried out relatively difficulty of tonifying Qi to internal-combustion engine under middle and high load dynamic condition; Reason is that exhaust back pressure sharply raises under the middle and high load dynamic condition of internal-combustion engine; Can't form intermittent negative pressure and open the one-way leaf valve of air supply passage rear end, fresh air can not get in the silencing apparatus.The middle and high load dynamic operation condition stage; It also is internal-combustion engine high exhaust gas discharge phase; This moment, the air fuel ratio of exhaust duct was in the dense partially stage, and first order conversion efficiency of catalytic converter is undesirable, if secondary air compensating can not be improved to exhaust environment the high transformation efficiency interval of second level catalyst converter; Second level conversion efficiency of catalytic converter equally can be very low, can not reach the purpose that significantly reduces harmful matter in the waste gas.
The control technique of present locomotive oil supply system; Can the Lambda of most of operating mode be controlled between 0.9～1.0; But the Lambda of boost phase operating mode is lower than 0.9; Reason is a vehicle in starting and accelerating process, and motor need provide bigger outputting power, satisfies the demand of acceleration performance.
Open day is on September 28th, 2005, and publication number is to disclose a kind of " in the locomotive outlet pipe, improving the method for catalytic control nitrogen oxide efficient " in the Chinese invention patent of CN1673496A.This patent is to utilize the tonifying Qi in exhaust duct of secondary air compensating device; Improve conversion efficiency of catalytic converter with this; But internal combustion engine locomotive exhaust back pressure under middle and high load dynamic condition sharply raises, and can cause the tonifying Qi difficulty, can't under full working condition, improve the catalyst converter transformation efficiency.Particularly; In this patent, mentioned the negative pressure end that secondary air control valve is installed in engine or Carburetor; The mode of accepting intermittent negative-pressure sucking and operating, and adopt motor-drive pump to force the mode of purt gas to carry out tonifying Qi, but these two kinds of schemes all are through the mode of tonifying Qi in the tail gas discharging pipe of high exhaust back pressure by force; Fundamentally solve especially under the middle and high loading condiction of internal-combustion engine the high problem of exhaust back pressure in the exhaust emissions pipeline.
Summary of the invention
Thereby providing a kind of middle and high load condition at internal-combustion engine, technical problem to be solved by this invention also can carry out the tail-gas purifying silencer that secondary air compensating makes the higher internal-combustion engine of catalyst converter transformation efficiency.
According to an aspect of the present invention, a kind of tail-gas purifying silencer of internal-combustion engine is provided, has comprised: the anechoic chamber, inside has silencing cavity; The exhaust emissions pipeline extends in the silencing cavity of anechoic chamber; First catalyst converter and second catalyst converter set gradually along gas flow direction in the exhaust emissions pipeline in silencing cavity; And air supply passage, being arranged between first catalyst converter and second catalyst converter, the front end of air supply passage stretches in the exhaust emissions pipeline, wherein, the downstream direction of the outlet of air supply passage exhaust gas flow in the exhaust emissions pipeline.
Further, also comprise valve control device, be arranged on the rear end of air supply passage, be used to control air supply passage and open or close by the rear end forward end is unidirectional.
Further, the part that is arranged in the exhaust emissions pipeline of air supply passage has the bend section that extends along the exhaust gas flow direction.
Further, the outer part of exhaust emissions pipeline that is arranged in of air supply passage also has second bend section that extends and be positioned at the silencing cavity of anechoic chamber along the exhaust gas flow direction.
Further, air supply passage have a bend section that is bent to form towards the exhaust gas flow direction, bend section tilts to stretch in the exhaust emissions pipeline.
Further, the exit end face of bend section is perpendicular to the bearing of trend of exhaust emissions pipeline.
Further, the bend section of air supply passage stretches in the arc section of exhaust emissions pipeline, and the medial axis of the medial axis of this bend section and exhaust emissions pipeline is tangent.
Further, air supply passage extend into the position near exhaust emissions passage central authorities at least.
Further, valve control device is an one-way leaf valve.
The present invention has following technique effect:
Owing to stream principle, air-flow has just left wall along the air supply passage Surface runoff near arriving its summit (90 degree); Fluid after the separation forms for example a pair of fixed symmetrical whirlpool (adhering to the whirlpool) in the air supply passage downstream, thereby forms a low pressure area in downstream, like this; Because the downstream direction of air supply passage outlet exhaust gas flow in the exhaust emissions pipeline; Just, make it possible to easily mend, improve exhaust environment into air towards this low pressure area; Improve conversion efficiency of catalytic converter, and then reduce exhaust emissions.
Description of drawings
Figure of description is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows typical motorcycle with the analysis of oxidation-reduction type catalyst converter air fuel ratio performance data;
Fig. 2 shows the schematic representation that air supply passage in the existing technology stretches into the exhaust emissions pipeline;
Fig. 3 shows the structural representation according to 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 the schematic representation that stretches into the exhaust emissions pipeline according to air supply passage in the tail-gas purifying silencer of the internal-combustion engine of the first embodiment of the present invention;
Fig. 6 shows the schematic representation that air supply passage in the tail-gas purifying silencer of internal-combustion engine according to a second embodiment of the present invention stretches into the exhaust emissions pipeline.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
As shown in Figure 3, comprise anechoic chamber 6, exhaust emissions pipeline 1, first catalyst converter 2, second catalyst converter 7 and air supply passage 3 according to the tail-gas purifying silencer of the internal-combustion engine of the first embodiment of the present invention.Wherein, the inside of anechoic chamber 6 has silencing cavity, and exhaust emissions pipeline 1 extends in the silencing cavity of anechoic chamber 6, and as can be seen from the figure, in the present embodiment, exhaust emissions pipeline 1 has one section arc section in silencing cavity.Set gradually along gas flow direction in first catalyst converter 2 and the exhaust emissions pipeline 1 of second catalyst converter 7 in the silencing cavity of anechoic chamber 6; And the front end of air supply passage 3 stretches in the exhaust emissions pipeline 1 between first catalyst converter 2 and second catalyst converter 7; Before being implemented in second catalyst converter 7, can carry out the secondary air importing; Add oxygen, optimize first catalyst converter 2 exhaust environment afterwards, reduce EGT.Fig. 5 more has been shown clearly in the schematic representation that air supply passage 3 stretches into exhaust emissions pipeline 1.Can find out that in conjunction with Fig. 3 and Fig. 5 the outlet of air supply passage 3 is downstream directions of exhaust gas flow in exhaust emissions pipeline 1.Owing to stream principle, air-flow has just left wall along the air supply passage Surface runoff near arriving its summit (90 degree); Form a low pressure area in downstream, like this, because the downstream direction of outlet exhaust gas flow in the exhaust emissions pipeline of air supply passage 3; Just, make it possible to easily mend, improve exhaust environment into air towards this low pressure area; Improve conversion efficiency of catalytic converter, and then reduce exhaust emissions.Internal-combustion engine is under middle and high load dynamic condition; Waste gas presents the characteristics of high exhaust back pressure, high exhaust flow velocity in the silencing apparatus; And this kind structure of air supply passage 3 is utilized above-mentioned low pressure area; Overcome this defective, even make under the middle and high load dynamic condition of internal-combustion engine, the catalyst converter waste gas operating conditions that also can realize ideal when waste gas presents high exhaust back pressure, high exhaust flow velocity in the silencing apparatus.Like this, under full working condition, all be in the air fuel ratio space of high transformation efficiency according to the catalyst converter in the tail-gas purifying silencer of internal-combustion engine of the present invention.
In addition; The tail-gas purifying silencer of internal-combustion engine of the present invention only adopts the mode that changes air supply passage structure and layout simply; Secondary air compensating problem in the time of can solving high exhaust back pressure and high exhaust flow velocity makes and also can carry out secondary air compensating in the middle and high load condition of internal-combustion engine.The mode of tonifying Qi in tail gas discharging pipe by force with respect to patent CN1673496A; The present invention implements simpler; And fundamentally to the high problem reason of exhaust back pressure in the tail gas discharging pipe; Through changing structure and the layout of air supply passage in tail gas discharging pipe, directly it is avoided.Be appreciated that the technological scheme that the present invention adopts avoided habitual 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 the rear end of air supply passage 3, is used to control air supply passage 3 and opens or closes by the rear end forward end is unidirectional.More preferably, in the present embodiment, this valve control device 4 is an one-way leaf valve.Even under the middle and high load dynamic condition of internal combustion locomotive, when waste gas presented high exhaust back pressure, high exhaust flow velocity in the silencing apparatus, this one-way leaf valve also can rely on above-mentioned low pressure area and open, thereby realized mending air through air supply passage 3.
In addition, like Fig. 3 and shown in Figure 5, as a kind of optimal way, the part that is arranged in exhaust emissions pipeline 1 of air supply passage 3 has the bend section that extends along the exhaust gas flow direction.Be appreciated that this downstream direction, and this pipe shape is simple and easy to make along outlet exhaust gas flow in exhaust emissions pipeline 1 of the bend section of exhaust gas flow direction extension.More preferably; In the present embodiment; As can be seen from Figure 5; The exhaust emissions pipeline 1 outer part that is arranged in of air supply passage 3 also has second bend section that extends and be positioned at the silencing cavity of anechoic chamber along the exhaust gas flow direction, and the existence of this second bend section makes that the position of this air supply passage 3 in silencing apparatus is more flexible, can arrange arbitrarily as required that it stretches into the location point of exhaust emissions pipeline 1.In addition, air supply passage 3 is set to have the shape of this second bend section, has also saved air supply passage 3 shared space in silencing apparatus.
More preferably, air supply passage 3 extend into the position near said exhaust emissions passage 1 central authorities at least, utilizes biglyyer and streams effect.
As shown in Figure 4, the tail-gas purifying silencer of internal-combustion engine according to a second embodiment of the present invention has identical formation with tail-gas purifying silencer according to the internal-combustion engine of the first embodiment of the present invention.Difference is; Different with the arrangement of air supply passage 3 among first embodiment; In the present embodiment; Air supply passage 3 has the bend section that is bent to form towards the exhaust gas flow direction, and bend section tilts and to stretch in the exhaust emissions pipeline 1, can clearly be seen that the shape of air supply passage 3 and concerns with the position of exhaust emissions pipeline 1 from Fig. 4 and Fig. 6.Preferably, in the present embodiment, the exit end face of the bend section of air supply passage 3 is perpendicular to the bearing of trend of exhaust emissions pipeline, so that the efficient of tonifying Qi reaches optimum.
With shown in Figure 6 different a bit be that as a kind of mode of execution, the bend section that further shows air supply passage 3 among Fig. 4 stretches in the arc section of exhaust emissions pipeline 1, and the medial axis of the medial axis of this bend section and exhaust emissions pipeline 1 is tangent.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the tail-gas purifying silencer of an internal-combustion engine comprises:
Anechoic chamber (6), inside has silencing cavity;
Exhaust emissions pipeline (1) extends in the silencing cavity of said anechoic chamber (6);
First catalyst converter (2) and second catalyst converter (7) set gradually along gas flow direction in the said exhaust emissions pipeline (1) in said silencing cavity; And
Air supply passage (3) is arranged between said first catalyst converter (2) and second catalyst converter (7), and the front end of said air supply passage (3) stretches in the said exhaust emissions pipeline (1),
It is characterized in that:
The downstream direction of the outlet of said air supply passage (3) exhaust gas flow in said exhaust emissions pipeline (1).
2. the tail-gas purifying silencer of internal-combustion engine according to claim 1 is characterized in that, also comprises valve control device (4), is arranged on the rear end of said air supply passage (3), is used to control said air supply passage (3) and opens or closes by the rear end forward end is unidirectional.
3. the tail-gas purifying silencer of internal-combustion engine according to claim 2 is characterized in that, the part that is arranged in said exhaust emissions pipeline (1) of said air supply passage (3) has the bend section that extends along the exhaust gas flow direction.
4. the tail-gas purifying silencer of internal-combustion engine according to claim 3; It is characterized in that the outer part of said exhaust emissions pipeline (1) that is arranged in of said air supply passage (3) also has second bend section that extends and be positioned at the silencing cavity of said anechoic chamber along the exhaust gas flow direction.
5. the tail-gas purifying silencer of internal-combustion engine according to claim 2 is characterized in that, said air supply passage (3) have a bend section that is bent to form towards the exhaust gas flow direction, said bend section tilts to stretch in the said exhaust emissions pipeline (1).
6. the tail-gas purifying silencer of internal-combustion engine according to claim 5 is characterized in that, the exit end face of said bend section is perpendicular to the bearing of trend of said exhaust emissions pipeline.
7. the tail-gas purifying silencer of internal-combustion engine according to claim 5; It is characterized in that; The bend section of said air supply passage (3) stretches in the arc section of said exhaust emissions pipeline (1), and the medial axis of the medial axis of this bend section and said exhaust emissions pipeline (1) is tangent.
8. according to the tail-gas purifying silencer of any described internal-combustion engine among the claim 1-7, it is characterized in that said air supply passage (3) extend into the position near said exhaust emissions passage (1) central authorities at least.
9. according to the tail-gas purifying silencer of any described internal-combustion engine among the claim 1-7, it is characterized in that said valve control device (4) is an one-way leaf valve.
10. the tail-gas purifying silencer of internal-combustion engine according to claim 8 is characterized in that, said valve control device (4) is an one-way leaf valve.
Priority Applications (1)
| 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 true CN102465731A (en) | 2012-05-23 |
| CN102465731B 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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Cited By (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 |
| CN111810380A (en) * | 2020-06-09 | 2020-10-23 | 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 (7)
| 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 |
| JP2002309929A (en) * | 2001-04-16 | 2002-10-23 | Suzuki Motor Corp | Exhaust emission control device for internal combustion engine |
| 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 |
-
2010
- 2010-11-05 CN CN201010534742.4A patent/CN102465731B/en active Active
Patent Citations (7)
| 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 |
| JP2002309929A (en) * | 2001-04-16 | 2002-10-23 | Suzuki Motor Corp | Exhaust emission control device for internal combustion engine |
| 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 |
Cited By (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 |
| CN111810380A (en) * | 2020-06-09 | 2020-10-23 | 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 |
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| Publication number | Publication date |
|---|---|
| CN102465731B (en) | 2016-05-04 |
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