CN2133677Y

CN2133677Y - Dissipative muffler for automobile

Info

Publication number: CN2133677Y
Application number: CN 92234560
Authority: CN
Inventors: 何万兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-10-10
Filing date: 1992-10-10
Publication date: 1993-05-19
Anticipated expiration: 2002-10-10

Abstract

The utility model relates to a muffler for automobiles, particularly a muffler used for automobiles with carrying capacity less than 8 tons, which comprises a cylindrical outer shell, an intake pipe, an intake expansion chamber, an exhaust expansion chamber, an airflow reflection perforated plate, an exhaust passage, an airflow micropore plate, a shunting expansion chamber, an exhaust tail pipe, an auxiliary exhaust tail pipe, a shunting plate, an auxiliary shunting plate, etc. The noise of the exhaust tail gas of the automobiles is lowered from 90-104 decibels to 78-100 decibels, the fuel saving ratio can reach 2% and the engine power can increase about 0.5%.

Description

Dissipative muffler for automobile

The utility model relates to the silencing apparatus that a kind of automobile is used, and particularly a kind ofly is suitable for the silencing apparatus that 8 tons of following automobiles of load-carrying are used.

As everyone knows, noise is a kind of public hazards in the environmental pollution, and noise mainly is from automobile in the city, particularly various trucies, though, various automotive mufflers are arranged in the prior art, all little desirable, for example, be that under the field of spaciousness, its noise is 104 decibels when running at high speed to the test result that has silencing apparatus Jiefang brand automobile, middling speed is 90 decibels, and environment is caused harmful effect.

The purpose of this utility model provides a kind of silencing apparatus that can reduce truck exhaust emissions noise, it is mainly constructed is external form one garden tube, and internal structure is mainly returned by diffusing tube, air-flow microwell plate, air-flow and penetrated perforated plate and bypassing exhaust plate and import and export pipe institute and formed.Load onto silencing apparatus of the present utility model in using same Jiefang brand automobile after, its noise level is reduced to 100 decibels when high speed, have only 78 decibels during middling speed, has improved the influence of ambient noise widely.

Now the specific embodiment with automotive muffler of the present utility model elaborates to the utility model in conjunction with the accompanying drawings, but does not limit scope of the present utility model.

Fig. 1 is the front tectonic maps of the utility model silencing apparatus, and wherein 1 is muffler shell, the 2nd, suction tude, the 3rd, and air inlet expansion chamber, the 4th, exhaust expansion chamber, the 5th, air-flow returns penetrates perforated plate, the 6th, exhaust passage, the 7th, air-flow microwell plate, the 8th, shunting expansion chamber, the 9th, tailpipe, the 10th, auxiliary exhaust tail pipe, the 11st, bypassing exhaust plate, the 12nd, reducing.The 13rd, auxiliary flow distribution plate.

Fig. 2 is an A-A profile among Fig. 1, and wherein 1 is muffler shell, the 2nd, and suction tude, the 9th, outlet pipe, the 10th, auxiliary exhaust pipe.

Fig. 3 is a B-B sectional drawing among Fig. 1, and wherein 5 is that air-flow returns and penetrates perforated plate, the 2nd, and suction tude, the 6th, the exhaust passage, the 14th, air-flow returns penetrates the perforated plate aperture.General aperture is 5-8mm.

Fig. 4 is the C-C sectional drawing among Fig. 1, and wherein 7 is air-flow microwell plates, the 6th, and the exhaust passage, the 15th, air-flow micropore aperture, general aperture is 2-3mm.

Its action principle is, after the motor exhaust of automobile enters suction tude 2, gas volume expands for the first time in the air inlet expansion chamber, air pressure descends, a part gas and the thermal energy consumption of expansion chamber inwall friction-produced the energy of a part of gas and the absorption of inwall noise is descended, about generally speaking tail gas of about 10% is by the aperture of air-flow microwell plate 7, (because of having only 2-3mm in the aperture) volumetric expansion once again, equally also reduced noise with above-mentioned reason, about 90% tail gas then enters exhaust expansion chamber 4 by the aperture (because of the aperture is 5-8mm) that air-flow returns the perforation plate, pressure has descended, same reason all makes noise reduce, and this tail gas partly enters tailpipe by exhaust passage 6 reducings 12 then.Obviously tail gas 7 is that the smooth type of flow is carried out in the exhaust passage, thus can rub glibly with the exhaust passage, and generation heat energy, thereby reach the reduction noise.Tail gas is during by reducing 12, well-regulated and interior wall friction reducing 12 further reduces noise level, tail gas enters tailpipe 9 and tail gas flow distribution plate 11, carries out well-regulated discharging, and the effect of tail gas flow distribution plate 11 is to reduce the turbulent flow phenomenon of tail gas to reach the noise that reduces when discharging.

10% above-mentioned tail gas expands the back by auxiliary exhaust tail pipe 10 in the shunting expansion chamber, and auxiliary flow distribution plate 13 is to reduce this tail gas turbulent flow phenomenon and the effect that reduces discharging tail gas noise equally.Need open startup that large throttle is an automobile at automobile, when going up a slope, more tail gas is arranged, for example the tail gas of about 20-30% is directly discharged by the auxiliary exhaust tail pipe, the purpose of air-flow microwell plate, shunting expansion chamber, auxiliary exhaust pipe, auxiliary flow distribution plate promptly is set, regulates that automobile tail gas when opening large throttle is unlikely to have the turbulent flow phenomenon and reduce noise in whole silencing apparatus inside.Auxiliary exhaust tail pipe and auxiliary shunting; The connecting part of tailpipe and flow distribution plate is with 170 ° of angular distortions, avoided the tail gas air-flow to be sprayed directly on on automobile chassis parts and the rear tyre and caused damage because exhaust temperature up to 400 ℃ about.

The utility model has the advantages that:

1, simple structure, easy to make, and soundproof effect is superior.

2, be fuel-economizing.By the test of Institute of Communication science, Yunnan Province, load onto that general fuel saving ratio can reach about 2% behind the silencing apparatus of the present utility model.

3, can improve the power of motor car engine, be generally about 0.5%.

So above-mentioned the 2nd, 3 can fuel-economizing and improve the reason of power, be because after silencing apparatus of the present utility model has been installed, the unified work of carrying out that fuses of motor and silencing apparatus because exhaust has reduced the turbulent flow phenomenon, so the passage smoothness is but fuel-economizing and raising power.

Claims

1, a kind of automotive muffler, it is characterized in that its structure is by (1) muffler shell, (2) suction tude, (3) air inlet expansion chamber, (4) exhaust expansion chamber, (5) air-flow returns and penetrates perforated plate, (6) exhaust passage, (7) air-flow microwell plate, (8) shunting expansion chamber, (9) tailpipe, (10) assist tailpipe, and the auxiliary flow distribution plate in (11) flow distribution plate and (13) is formed.

2,, it is characterized in that being connected of tailpipe and flow distribution plate, and being connected of auxiliary exhaust tail pipe and auxiliary flow distribution plate all is to connect with 170 ° of angles respectively according to the silencing apparatus of claim 1.