CN207879448U - A kind of muffler with catalyst and high-power two-stroke Anti-flame gasoline engine - Google Patents

Abstract

A kind of muffler with catalyst, including shell, air inlet is arranged in shell tail portion, partition board is arranged in enclosure interior, partition board divides housing 135 into inlet chamber and discharge chamber, and direct hole is offered in the middle part of partition board, and direct hole is directed to the air inlet of shell tail portion, partition board installs catalyst on the upside of direct hole, catalyst under being installed on the downside of direct hole；Muffler forms three exhaust passages, respectively：Air inlet-inlet chamber-goes up catalyst-discharge chamber, the lower catalyst-discharge chamber of air inlet-inlet chamber-, air inlet-inlet chamber-direct hole-discharge chamber.The utility model provides a kind of muffler structure of the double catalyst of band, increases in line pore structure, the exhaust back pressure in muffler is reduced, and exhaust is more smoothly compared with before, therefore engine power can be promoted by a small margin.

Description

A kind of muffler with catalyst and high-power two-stroke Anti-flame gasoline engine

Technical field

The utility model belongs to technical field of engines, refers in particular to a kind of muffler with catalyst and high-power two-stroke is anti- Flame gasoline engine.

Background technology

Current high-power two-stroke gasoline engine is to pass through Europe II or EPAIII emission request, it is necessary to add in muffler Dress catalyst (three-way emission control device) to carry out second-time burning to exhaust gas；I.e. a large amount of CH, NOx, CO are by the catalysis of catalyst Effect is converted into CO2 discharge air, while the value for the pernicious gas (CH, NOx, CO) being discharged just is far below Europe II or EPAIII and arranges Laws and regulations requirement is put, can be sold in American-European countries.

The shortcomings that prior art, is as follows：

1, since muffler increases catalyst, exhaust efficiency is deteriorated, and engine power has nearly 10% power damage It loses.、

2, also in that being mounted with catalyst, catalyst can carry out very thorough second-time burning to exhaust gas, lead to engine temperature Degree is very high, and the requirement for being even more than European directive about gasoline engine Wen Sheng limits.

3, it is the problem of bigger, as shown in Fig. 3, since carburetor is returning at a high speed idling (closing of air throttle moment) mistake Cheng Zhong, fresh air are instantaneously largely cut off by air throttle, and the air into cylinder becomes very thin at once, but carbureter main jet In part fuel oil but because of liquid inertia, continue to spray in carburetor Venturi tube, be mixed together into rarefied air a small amount of Overrich combustion gas enters cylinder combustion.The burning of this certain portion gas is extremely insufficient, also can not by the thorough second-time burning of catalyst, It can only be that after being discharged to outside engine, high temperature properties are heated using itself, encounter air and generate and burn outside machine！So We can be appreciated that moment flame is sprayed from exhaust outlet in the moment for unclamping throttle, just disappear at once (mixed after the idling steady of back It closes gas and belongs to normal rates, not will produce flame).The outer flame of such machine can not also be connect simultaneously by American-European safety clause By, thus on the market there is this technical bottleneck in gasoline engine of the two-stroke huge discharge with catalyst substantially at present.

Utility model content

The purpose of this utility model is to provide a kind of muffler with catalyst, increases in line pore structure, in muffler Exhaust back pressure is reduced, and exhaust is more smoothly compared with before, therefore engine power can be promoted by a small margin.

What the purpose of this utility model was realized in：A kind of muffler structure of the double catalyst of band, including shell, shell tail Air inlet is arranged in portion, and partition board is arranged in enclosure interior, and partition board divides housing 135 into inlet chamber and discharge chamber, it is characterised in that：In partition board Portion offers direct hole, and direct hole is directed to the air inlet of shell tail portion, and partition board installs catalyst on the upside of direct hole, in direct hole The lower catalyst of downside installation；Muffler forms three exhaust passages, respectively：Air inlet-inlet chamber-go up catalyst-discharge chamber, Lower catalyst-the discharge chamber of air inlet-inlet chamber-, air inlet-inlet chamber-direct hole-discharge chamber.

Wherein, distance of the direct hole apart from air inlet compares the distance of upper catalyst or lower catalyst apart from air inlet more Closely.

The utility model additionally provides a kind of high-power two-stroke Anti-flame gasoline engine, including cylinder, is set on cylinder sidewall Exhaust outlet is set, further includes the muffler in said program, the air inlet of muffler shell tail portion coordinates on exhaust outlet.

The utility model is prominent and beneficial compared with prior art to be had the technical effect that：

Catalyst device is designed to " binary channels " structure, i.e., two catalyst purify exhaust gas parallel, and the position of catalyst mouth Direct hole upper and lower sides are occupy, do not have face cylinder exhaust port.In line pore diameter size will be determined on a case-by-case basis；This hole due to Face cylinder exhaust port, and compared with catalyst, it with a distance from cylinder exhaust port closer to.Cylinder is discharged when there is moment overrich exhaust gas When, " moment overrich exhaust gas " can directly be arranged by aperture to air because of air fluid mechanics principle, will not by catalyst into Row " heat treatment "." the moment overrich exhaust gas " not heated, which encounters air, to burn, and flame problem is addressed. But such design certainly will allow the discharge value of engine compared with the state higher before improvement, this just needs us to be set by testing Count the diameter of the in line aperture.Purpose is engine should can be allowed to reach emission regulation demands, can guarantee carburetor again Exhaust outlet not flame when closed throttle.(meeting environmental protection and security legislation requirement simultaneously)

Due to increasing this direct hole, the exhaust back pressure in muffler is reduced, and exhaust is more smoothly compared with before, Therefore engine power can be promoted by a small margin.In addition portion will not be heated by catalyst and be purified, the work of muffler Temperature also can decrease, this has also helped engine operating temperature reduction.

Description of the drawings

Fig. 1 is the waste gas flow direction view without direct hole；

Fig. 2 is the muffler internal structure chart of the double catalyst of the utility model band；

Fig. 3 is the structure chart in petrol engine air admission channel.

Reference numeral：1, cylinder；2, spark plug；3, air filter；4, carburetor；5, inlet throat；6, check-valves；7, living Plug；8, shell；8a, air inlet；9, partition board；9a, direct hole；10, upper catalyst；11, lower catalyst；A, discharge chamber；B, inlet chamber.

Specific implementation mode

The utility model is further described with specific embodiment below in conjunction with the accompanying drawings, referring to Fig. 1-3：

Exhaust outlet is arranged on 1 side wall of cylinder in a kind of high-power two-stroke Anti-flame gasoline engine, including cylinder 1, and exhaust outlet is matched Closing has the muffler of the double catalyst of band, and muffler includes shell 8, and air inlet 8a is arranged in 8 tail portion of shell, and air inlet 8a matches with exhaust outlet It closes；Partition board 9 is arranged in 8 inside of shell, and shell 8 is divided into inlet chamber B and discharge chamber A by partition board 9, it is characterised in that：It opens at 9 middle part of partition board It is directed to the air inlet 8a of 8 tail portion of shell equipped with direct hole 9a, direct hole 9a, partition board 9 installs catalyst 10 on the upside of direct hole 9a, Catalyst 11 under being installed on the downside of direct hole 9a；Muffler forms three exhaust passages, respectively：Air inlet 8a-inlet chamber B- Upper 10-discharge chamber of catalyst A, air inlet 8a-inlet chamber B-11-discharge chamber of lower catalyst A, air inlet 8a-inlet chamber B-are straight Round 9a-discharge chamber A.

Wherein, distances of the direct hole 9a apart from air inlet 8a compares upper catalyst 10 or lower catalyst 11 apart from air inlet 8a's Distance closer to.So set, when there is moment overrich exhaust gas that cylinder 1 is discharged, " moment overrich exhaust gas " can be because of air fluid force Principle is learned, is directly arranged to air by aperture, " heat treatment " will not be carried out by catalyst.

Above-described embodiment is only the preferred embodiment of the utility model, not limits the protection model of the utility model according to this It encloses, therefore：The equivalence changes that all structures, shape, principle according to the utility model are done, should all be covered by the protection of the utility model Within the scope of.

Claims (3)

1. a kind of muffler with catalyst, including shell (8), air inlet (8a) is arranged in shell (8) tail portion, is set inside shell (8) Partition board (9) is set, shell (8) is divided into inlet chamber (B) and discharge chamber (A) by partition board (9), it is characterised in that：It is opened up in the middle part of partition board (9) There are direct hole (9a), direct hole (9a) to be directed to the air inlet (8a) of shell (8) tail portion, partition board (9) is pacified on the upside of direct hole (9a) Catalyst (10) is loaded onto, the catalyst (11) under installation on the downside of direct hole (9a)；Muffler forms three exhaust passages, respectively：Into Gas port (8a)-inlet chamber (B)-goes up catalyst (10)-discharge chamber (A), air inlet (8a)-inlet chamber (B)-lower catalyst (11)-discharge chamber (A), air inlet (8a)-inlet chamber (B)-direct hole (9a)-discharge chamber (A).

2. a kind of muffler with catalyst according to claim 1, it is characterised in that：The direct hole (9a) is apart from air inlet The distance of mouthful (8a) compared to the distance of upper catalyst (10) or lower catalyst (11) apart from air inlet (8a) closer to.

3. a kind of high-power two-stroke Anti-flame gasoline engine, including cylinder (1), exhaust outlet, feature are set on cylinder (1) side wall It is：Further include muffler as claimed in claim 1 or 2, the air inlet (8a) of muffler shell (8) tail portion coordinates in exhaust outlet On.