CN103603712B - Acoustic filter for miniature gasoline engine - Google Patents
Acoustic filter for miniature gasoline engine Download PDFInfo
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- CN103603712B CN103603712B CN201310540980.XA CN201310540980A CN103603712B CN 103603712 B CN103603712 B CN 103603712B CN 201310540980 A CN201310540980 A CN 201310540980A CN 103603712 B CN103603712 B CN 103603712B
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- procapsid
- exhaustor
- gasoline engine
- conduit
- catalyst
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Abstract
The invention discloses a kind of acoustic filter for miniature gasoline engine, including the housing being made up of procapsid and back casing, it is provided with catalyst location-plate between procapsid and back casing, by forming ante-chamber and back cavity in housing, catalyst location-plate is positioned at back cavity side and is provided with the catalyst chamber of built-in catalyst; Being provided with mean for the exhaust outlet that waste gas enters on back casing, exhaust outlet is connected with back cavity; Being provided with mean for the exhaustor that gas is discharged on procapsid, the entrance point of exhaustor is placed in ante-chamber; Being arranged with an air leading-in conduit in the entrance point of described exhaustor, the inlet end of this air leading-in conduit connects with hull outside, is provided with mean for the passage of gas circulation between inwall and the outer wall of air leading-in conduit of exhaustor. This deafener ensure that the abundant reaction of waste gas, reduces environmental pollution; Subregion performs twice at reaction, has disperseed the temperature of acoustic filter, it is to avoid localized hyperthermia occur; The waste gas discharged meets discharge standard, in turn ensure that gasoline engine has original combination property simultaneously.
Description
Technical field
The present invention relates to acoustic filter field, especially relate to a kind of acoustic filter for miniature gasoline engine.
Background technology
Miniature gasoline engine has volume advantage little, lightweight, therefore extensively transports in handheld garden instrument, rescue field of tool. Along with recent year, outer more and more high to environmental requirement, the intrinsic burning of miniature gasoline engine is insufficient, and the shortcoming that noxious gas emission is high is very prominent.
Mainly adopt in the industry two kinds of methods at present: one is that the method adopting layered scavenging reduces noxious gas emission; Two is that the method adopting catalyst post processing reduces noxious gas emission. The structure relatively traditional structure of layering is complicated, can not thoroughly solve problem simultaneously, also needs to supplement catalyst post processing, thus adopts cost high, and technical difficulty is big, and in batch production process, process control needs is high. And the method directly adopting catalyst post processing on the basis of traditional structure, although also can make emission compliance, but owing to the amount needing catalyst is big so that producing localized hyperthermia's degree in last handling process, gasoline engine coating member melts.
Therefore, the method that domestic manufacturer mostly adopts lean burn as far as possible, although this method can take into account discharge and temperature, but owing to gaseous mixture is partially rare so that small gasoline engines declines to a great extent. It is embodied in: peak torque declines, and speed at maximum torque is close to max-power-output speed; Coefficient of torque reserve is greatly reduced, and overcomes the ability of resistance substantially to reduce in machine operation process.
Summary of the invention
The present invention is in order to overcome the deficiencies in the prior art, it is provided that a kind of gasoline exhaust is up to standard, and can keep the deafener of the original combination property of gasoline engine.
To achieve these goals, the present invention is by the following technical solutions: a kind of acoustic filter for miniature gasoline engine, including the housing being made up of procapsid and back casing, catalyst location-plate it is provided with between procapsid and back casing, by forming ante-chamber and back cavity in housing, catalyst location-plate is positioned at back cavity side and is provided with the catalyst chamber of built-in catalyst; Being provided with mean for the exhaust outlet that waste gas enters on back casing, exhaust outlet is connected with back cavity; Being provided with mean for the exhaustor that gas is discharged on procapsid, the entrance point of exhaustor is placed in ante-chamber; Being arranged with an air leading-in conduit in the entrance point of described exhaustor, the inlet end of this air leading-in conduit connects with hull outside, is provided with mean for the passage of gas circulation between inwall and the outer wall of air leading-in conduit of exhaustor.
As preferably, described air leading-in conduit is sheathed on 1.8-2.2 times that the tube length in exhaustor is air leading-in conduit internal diameter size.
Described exhaustor is placed in 0.6-0.8 times that the tube length in procapsid is procapsid width.
Further, described exhaust outlet is the through hole being located on back casing.
Described exhaust outlet is right against the opening part in catalyst chamber and arranges.
Further, being connected by locating shaft between described procapsid and back casing, locating shaft one end is connected with procapsid, and the other end is connected with back casing after catalyst location-plate.
The inlet end of described air leading-in conduit stretches out in the outside of procapsid.
Further, the inlet end of described air leading-in conduit flushes with the side end face of procapsid.
Operation principle; Carburetor supply power gaseous mixture (partially dense gaseous mixture), owing to oxygen is insufficient during in-cylinder combustion, the concentration of exhaust gases after combustion is high, and oxygen content is low, and waste gas oxidation reaction of harmful gas HC when by catalyst is suppressed; When waste gas passes through from muffler tail pipe high speed, utilize adsorption effect produced by high velocity air, opposite direction at air motion inserts an air leading-in conduit, the fresh air outside acoustic filter is allowed to enter, utilize the hot conditions of waste gas self, allow HC obtain secondary oxidation course of reaction under aerobic conditions in muffler tail pipe; Namely allowing waste gas catalytic conversion process in acoustic filter is that substep, subregion, gradation complete.
Early stage is to utilize anoxia to allow oxidation reaction be suppressed, and the later stage is to utilize the automatic oxygen supply of adsorption effect produced by exhaust airstream, allows oxidation reaction process be continued, both the earthquake intensity of oxidation reaction had been controlled, spread again the region of reaction, extend the process of reaction so that react further thorough; Because the introducing dilution of fresh air, also reduce the temperature in acoustic filter and exhaustor; Remaining power gaseous mixture due to what carburetor supplied, therefore gasoline engine still ensures that original combination property.
In sum, the invention have the advantages that this muffler structure is simple, processing and manufacturing cost is low, it is ensured that the abundant reaction of waste gas, reduce environmental pollution; Subregion performs twice at reaction, has disperseed the temperature of acoustic filter, it is to avoid localized hyperthermia occur; The waste gas discharged meets discharge standard, in turn ensure that gasoline engine has original combination property simultaneously.
Accompanying drawing explanation
Fig. 1 is the front view of the present invention.
Fig. 2 is the sectional view at the A-A place of Fig. 1.
Fig. 3 is the sectional view at the B-B place of Fig. 1
Detailed description of the invention
In order to make those skilled in the art be better understood from the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete description.
As Figure 1-3, a kind of acoustic filter for miniature gasoline engine, including the housing being made up of procapsid 1 and back casing 2, catalyst location-plate 3 it is provided with between procapsid 1 and back cover, housing cavity is divided into ante-chamber 11 and back cavity 21 by this catalyst location-plate, catalyst location-plate 3 is positioned at back cavity side and is provided with the catalyst chamber 31 of built-in catalyst;Being provided with mean for the exhaust outlet 4 that waste gas enters on back casing 2, exhaust outlet 4 connects with back cavity; This exhaust outlet can be the side being located at back casing 2, can also be access back cavity by flue gas leading, in the present embodiment, exhaust outlet is arranged on the through hole on the front of back casing, and the entrance point corresponding to catalyst chamber 31 is arranged, such waste gas one comes in react with catalyst rapidly, advantageously ensures that the abundant of chemical reaction; Waste gas, behind catalyst chamber 31, enters into ante-chamber 11 through catalyst chamber 31;
Being provided with mean for the exhaustor 5 that gas is discharged on procapsid 1, the entrance point 51 of exhaustor 5 is placed in ante-chamber 11, and the port of export passes outside procapsid 1; Being arranged with an air leading-in conduit 6 in the entrance point 51 of described exhaustor 5, the inlet end 61 of this air leading-in conduit 6 passes outside procapsid 1, it is clear that can also be flushed with procapsid by inlet end 61; It is provided with gap, to form the passage 7 for the waste gas circulation after primary first-order equation between outer wall and the inwall of exhaustor of air leading-in conduit 6. Waste gas enters in ante-chamber behind catalyst chamber 31, then the port of export 52 is flowed at a high speed by the passage 7 of exhaustor 5, and the gas velocity of liquid assets in exhaustor is quickly, the inlet end 61 of air leading-in conduit is created one stronger absorption affinity by the air-flow of high speed circulation, sucks in exhaustor by extraneous fresh air by air leading-in conduit smoothly; And simultaneously through the temperature of the waste gas self of primary first-order equation or significantly high, the entrance of fresh air in exhaustor, allow waste gas obtain secondary oxidation course of reaction under aerobic conditions in exhaustor so that in exhaustor, expellant gas degree of purification is greatly improved.
In order to make the effect that secondary oxidation reacts reach optimum, concrete, that described air leading-in conduit is sheathed in exhaustor 1.8-2.2 times that tube length b is air leading-in conduit internal diameter r, namely in the present embodiment preferably 1.8 times, i.e. b=1.8r; The tube length c that described exhaustor is placed in procapsid is 0.6-0.8 times of procapsid width a, and the present embodiment is preferably 0.67 times, i.e. c=0.67a.
Concrete, it being connected by two locating shafts 8 between described procapsid and back casing, locating shaft 8 one end is connected with procapsid, and the other end is connected with back casing after catalyst location-plate, and overall structure is simple, easy for installation.
Operation principle: in this gasoline engine electromotor, waste gas enters the back cavity of deafener through exhaust outlet 4, volume obtains expanding for the first time, and noise energy obtains attenuation of the first kind, produces second-time burning then through the oxidation reaction of catalyst, and the harmful substance contents of discharge reduces; Concrete, this deafener is utilize anoxia to allow oxidation reaction be suppressed in early stage, later stage is to utilize adsorption effect produced by exhaust airstream, automatically in air leading-in conduit, suck the oxygen in the external world, allow oxidation reaction process be continued in exhaustor, both controlled the earthquake intensity in catalyst intracavity oxidation reaction, spread again the region of reaction, extend the process of reaction so that reaction is further thorough, and expellant gas degree of purification is higher; Because the introducing dilution of fresh air so that first time oxidation reaction earthquake intensity reduces, it is to avoid localized hyperthermia occur on back casing; Remaining power gaseous mixture due to what carburetor supplied, therefore gasoline engine still ensures that original combination property.
Below in conjunction with the test data elaboration to the present invention;
In order to ensure the comparability of experimental data, experiment gasoline engine selects one to operate through 50 hours, and the gasoline engine of stable performance does not carry out any state change simultaneously in experimentation;Experimental facilities, accuracy of instrument, experimental technique, strictly undertaken by EPA (EPA) requirement.
1. direct sampling experimental data (directly from contact medium of muffler post-sampling, it does not have the data of automatic inflating device effect), as shown in following table one;
Table one
2. dilution sampling experimental data (sampling from muffler tail pipe mouth, have the data of automatic inflating device effect), as shown in following table two;
Table two
4. gasoline engine speed characteristics (external characteristics) experiment, engine rig test data record is such as shown in following table three;
Table three
4. experiment conclusion:
By the result from directly sampling and dilution sampling, namely from the value of table one with the brake specific exhaust emission table two, gasoline engine after improvement ensure that emission compliance (standard-required: CO < 603, HC+NOx < 72), and harmful gas CO declines 10.46%, HC+NOx reduces by 13.27%, and the lifting effect of expellant gas degree of purification is fairly obvious.
From gasoline engine speed characteristics data, namely from table three, also has good low speed torque simultaneously, coefficient of torque reserve (ratio of the speed of crankshaft that speed of crankshaft that namely maximum measurement moment of torsion is corresponding is corresponding with maximum measurement power) reaches more than 1.5, and generally coefficient of torque reserve is about 1.3, substantially beyond standard value, the gasoline engine after improvement still ensures that original combination property.
Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, all should belong to the scope of protection of the invention.
Claims (8)
1. for an acoustic filter for miniature gasoline engine, including by procapsid (1) and back casing
(2) housing constituted, catalyst location-plate (3) it is provided with between procapsid and back casing, by forming ante-chamber (11) and back cavity (21) in housing, catalyst location-plate is positioned at back cavity side and is provided with the catalyst chamber (31) of built-in catalyst; Being provided with mean for the exhaust outlet (4) that waste gas enters on back casing (2), exhaust outlet (4) is connected with back cavity (21); Being provided with mean for the exhaustor (5) that gas is discharged on procapsid (1), the entrance point (51) of exhaustor (5) is placed in ante-chamber (11); It is characterized in that: in the entrance point (51) of described exhaustor (5), be arranged with an air leading-in conduit (6), the inlet end (61) of this air leading-in conduit (6) connects with hull outside, is provided with mean for the passage (7) of gas circulation between inwall and the outer wall of air leading-in conduit (6) of exhaustor (5).
2. the acoustic filter for miniature gasoline engine according to claim 1, it is characterised in that: described air leading-in conduit is sheathed on 1.8-2.2 times that the tube length in exhaustor is air leading-in conduit internal diameter size.
3. the acoustic filter for miniature gasoline engine according to claim 1, it is characterised in that: described exhaustor is placed in 0.6-0.8 times that the tube length in procapsid is procapsid width.
4. the acoustic filter for miniature gasoline engine according to claim 1, it is characterised in that: described exhaust outlet (4) is the through hole being located on back casing (2).
5. the acoustic filter for miniature gasoline engine according to claim 4, it is characterised in that: described exhaust outlet (4) is right against the opening part in catalyst chamber (31) and arranges.
6. the acoustic filter for miniature gasoline engine according to claim 1, it is characterized in that: be connected by locating shaft (8) between described procapsid and back casing, locating shaft (8) one end is connected with procapsid, and the other end is connected with back casing after catalyst location-plate.
7. the acoustic filter for miniature gasoline engine according to claim 1, it is characterised in that: the inlet end (61) of described air leading-in conduit (6) stretches out in the outside of procapsid (1).
8. the acoustic filter for miniature gasoline engine according to claim 1, it is characterised in that: the inlet end (61) of described air leading-in conduit (6) flushes with the side end face of procapsid (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540980.XA CN103603712B (en) | 2013-11-06 | 2013-11-06 | Acoustic filter for miniature gasoline engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540980.XA CN103603712B (en) | 2013-11-06 | 2013-11-06 | Acoustic filter for miniature gasoline engine |
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| Publication Number | Publication Date |
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| CN103603712A CN103603712A (en) | 2014-02-26 |
| CN103603712B true CN103603712B (en) | 2016-06-15 |
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| CN201310540980.XA Active CN103603712B (en) | 2013-11-06 | 2013-11-06 | Acoustic filter for miniature gasoline engine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640286A (en) * | 2017-02-04 | 2017-05-10 | 山东华盛农业药械有限责任公司 | Flame damping structure of silencer |
| CN107288707A (en) * | 2017-08-04 | 2017-10-24 | 浙江崴光工贸有限公司 | A kind of muffler for miniature gasoline engine |
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| CN1785486A (en) * | 2005-11-04 | 2006-06-14 | 桂林利凯特环保实业股份有限公司 | Tail gas purification method of universal small size gasoline engine and its device |
| CN200999643Y (en) * | 2007-02-01 | 2008-01-02 | 上海钊辉科技有限公司 | Catalyst device of locomotive exhaust pipe |
| EP1895118A1 (en) * | 2006-08-29 | 2008-03-05 | Tecumseh Products Company | Passive secondary air muffler |
| CN201581971U (en) * | 2009-10-30 | 2010-09-15 | 光阳工业股份有限公司 | Motorcycle exhaust pipe structure |
| CN201599114U (en) * | 2009-04-30 | 2010-10-06 | 孟荣水 | General engine |
| CN201661344U (en) * | 2010-02-10 | 2010-12-01 | 重庆宗申通用动力机械有限公司 | Silencer |
| CN202611840U (en) * | 2012-06-14 | 2012-12-19 | 浙江超越实业有限公司 | Silencer for gasoline engine |
| CN203669974U (en) * | 2013-11-06 | 2014-06-25 | 涛涛集团有限公司 | Silencer for small petrol engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3944054B2 (en) * | 2002-10-30 | 2007-07-11 | 本田技研工業株式会社 | Engine exhaust gas purification device |
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2013
- 2013-11-06 CN CN201310540980.XA patent/CN103603712B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785486A (en) * | 2005-11-04 | 2006-06-14 | 桂林利凯特环保实业股份有限公司 | Tail gas purification method of universal small size gasoline engine and its device |
| EP1895118A1 (en) * | 2006-08-29 | 2008-03-05 | Tecumseh Products Company | Passive secondary air muffler |
| CN200999643Y (en) * | 2007-02-01 | 2008-01-02 | 上海钊辉科技有限公司 | Catalyst device of locomotive exhaust pipe |
| CN201599114U (en) * | 2009-04-30 | 2010-10-06 | 孟荣水 | General engine |
| CN201581971U (en) * | 2009-10-30 | 2010-09-15 | 光阳工业股份有限公司 | Motorcycle exhaust pipe structure |
| CN201661344U (en) * | 2010-02-10 | 2010-12-01 | 重庆宗申通用动力机械有限公司 | Silencer |
| CN202611840U (en) * | 2012-06-14 | 2012-12-19 | 浙江超越实业有限公司 | Silencer for gasoline engine |
| CN203669974U (en) * | 2013-11-06 | 2014-06-25 | 涛涛集团有限公司 | Silencer for small petrol engine |
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| CN103603712A (en) | 2014-02-26 |
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Effective date of registration: 20170505 Address after: 321400 Zhejiang city of Lishui province Jinyun County Road No. 6 Xinmin Street Xinbi Patentee after: Zhejiang Taotao Vehicle Co., Ltd. Address before: Lishui City, Zhejiang province 321403 Xinmin Road Jinyun Yun County town 6 Patentee before: TAOTAO GROUP CO., LTD. |