CN2825968Y

CN2825968Y - Exhausting and purifying muffler for gasoline vehicle with electric fuel injection system

Info

Publication number: CN2825968Y
Application number: CNU2005200096142U
Authority: CN
Inventors: 林辉江
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-13
Filing date: 2005-07-13
Publication date: 2006-10-11
Anticipated expiration: 2015-07-13

Abstract

The utility model relates to an exhausting and purifying muffler for a gasoline vehicle with an electric fuel injection system, which is characterized in that in a shell body (2), the front part is provided with a purifier composed of three-efficiency catalytic converter and a flow guide cone (3), intermediate silencing pipes (6, 12) are installed at the middle part, the back part is provided with an exhaust silencing pipe (11) extending outside the shell body (2), and the tail end of the exhaust silencing pipe is provided with an opening; the silencing pipes (6, 11, 12) are all of the same pipe structure of which one end is provided with an opening, and the other end is closed. In order to reduce noise further, the inner side of a right end cover (10) at the terminal end of the shell body (2) is provided with sound absorbing material (9) and a protective board (8). The utility model has the functions of silencing and purifying and has the advantages of compact structure, little space occupation, good mechanical strength and rigidity, large silencing quantity and small power loss ratio. The utility model not only can meet the requirements about the limiting value of the noise and exhaust of China, but also can meet the requirements of a postposition engine vehicle to installation positions.

Description

Exhaust purifying silencer for electric injection gasoline vehicle

The technical field is as follows:

the utility model relates to a silencer, especially electricity spouts gasoline car exhaust purification silencer.

Secondly, background art:

as is well known, gasoline engines for gasoline automobiles have been carburetor type, and electric jet type gasoline engines have been used. Although there are many advantages to the emission of the electric injection gasoline engine over the carburetor type, as the national regulations become more stringent, the emission of the electric injection gasoline engine does not meet the requirements of the national regulations, mainly the content of carbon monoxide (CO), Hydrocarbon (HC) and nitrogen oxide (NOx) is too high. Therefore, an off-gas treatment is also necessary. Typically, a separate three-way catalytic converter is installed between the engine and the muffler. The core of the catalytic action is a catalyst, which is a substance that can change the rate of a chemical reaction while its own mass and composition remain unchanged before and after the chemical reaction, as shown in fig. 1. In fig. 1, 1 and 7 are connecting flanges, 2 is an intake pipe, 3 and 5 are draft tubes, 4 is a three-way catalytic converter, and 6 is an exhaust port. After the exhaust gas comes out of the engine, the CO, HC and NOx are reduced under the catalysis of the three-way catalytic converter. But must be implemented with a large installation space. This is not possible with a rear-mounted gasoline car.

The conventional muffler is also made as a separate device as shown in fig. 2. In figure 2, 2 is a connecting flange, 1 and 6 are end covers, 8, 4 and 5 are partition boards, 3 is an air inlet pipe, and 7 is an exhaust pipe, and the silencer is characterized in that the two ends of the air inlet pipe and the exhaust pipe are open and parallel to the axial lead of a silencer, a cavity 1 and a cavity IV are resonance cavities, a cavity II and a cavity III are expansion cavities, and 10 is a vent hole. Waste gas gets into from silencer intake pipe 3, resonates through the aperture and the cavity I that open on the pipe wall in first chamber to expand in III chamber, gaseous through air vent 10 entering II chamber inflation, discharge the atmosphere of going into by the blast pipe again, resonate in IV chamber simultaneously. The insertion loss (sound-deadening amount) of such a muffler is not large, and is generally only ten-odd decibels. Can not meet the requirements of the national relevant standards. There is also no space available for a rear-end vehicle to have both a three-way catalytic converter and a muffler installed.

Thirdly, the contents of the utility model:

the utility model aims at providing an electricity spouts gasoline car exhaust purification silencer that can satisfy the relevant limit value requirement of discharging and noise of country, can satisfy the installation requirement of rear engine car again.

In order to achieve the above purpose, the utility model has the following specific scheme: the utility model provides an electricity spouts gasoline car exhaust purification silencer, includes casing, left end lid, right-hand member lid, baffle and has the muffler pipe of aperture, and its key is: A. in the shell, the front part is provided with a purifier, the middle part is provided with a middle silencing pipe, and the rear part extends out of the shell through an exhaust silencing pipe with an opening at the tail end; B. the silencing pipes are pipe structures with one ends opened and the other ends closed.

The purifier consists of a diversion cone and a three-way catalytic converter, wherein the front end of the diversion cone is provided with an air inlet pipe, and the three-way catalytic converter at the rear end of the diversion cone is fixed in the shell through a support plate and is communicated with the chamber I. The utility model discloses three effect catalytic converter sets up in the silencer casing, can guarantee the purification effect before the noise elimination to play aperture blowout effect, can satisfy the installation requirement of rearmounted engine car again, practiced thrift installation space.

The total area of the small holes on the pipe walls of the middle silencing pipe and the exhaust silencing pipe is larger than the sectional area of the pipe; the total sectional area of each middle silencing pipe is larger than that of the air inlet pipe.

The middle muffling pipes are radially distributed in the shell, wherein the head end of the front middle muffling pipe is opened, and the tail end of the front middle muffling pipe is closed; the head end of the rear middle silencing pipe is closed, and the tail end of the rear middle silencing pipe is opened; all the muffling tubes are supported and fixed by more than two points.

The middle silencing pipe is arranged on the partition board and positioned in the cavity II, wherein the middle silencing pipe with the opening at the head end extends into the cavity I, and the middle silencing pipe with the opening at the tail end extends into the cavity III.

The utility model discloses send into head end open-ended middle muffler pipe with the gas after purifying, then, get into II cavity through the aperture on this muffler pipe, again by the aperture on the head end confined middle muffler pipe wall get into in this middle muffler pipe, discharge into III cavity again, go up the aperture through exhaust muffler pipe againand get into exhaust muffler pipe, the tail end row from exhaust muffler pipe is to the atmosphere at last. This allows the air flow to exit uniformly only from the small holes; the air flow can only enter other silencing tubes from the small holes, and the silencer exhausted by the exhaust silencing tubes can reduce noise repeatedly in a layered mode, so that the silencing quantity is large.

In order to further reduce noise, a sound absorbing material and a guard plate are provided inside the right end cover at the distal end of the housing.

The utility model has the advantages that: the muffler has the advantages of muffling and purifying functions, compact structure, small occupied space, good mechanical strength and rigidity, large muffling amount and small power loss ratio, and can meet the national emission and noise limit requirements and the mounting position requirements of rear-engine automobiles.

Fourthly, explanation of the attached drawings:

FIG. 1 is a schematic view of a prior art discharge device;

FIG. 2 is a schematic diagram of a muffler in the prior art;

fig. 3 is a schematic structural diagram of the present invention;

fig. 4 is a sectional view a-a of fig. 3.

The fifth embodiment is as follows:

referring to fig. 3, the utility model mainly comprises an air inlet pipe 1, a shell 2, a diversion cone 3, a three-way catalytic converter 4, a clapboard 5, a muffler pipe 6, a clapboard 7, a guard plate 8, a sound absorbing material 9, a right end cover 10, a muffler pipe 11, a muffler pipe 12, a support plate 13, a left end cover 14 and a small hole 15, wherein, a purifier is arranged at the front part in the shell 2, the middle muffler pipes 6 and 12 are arranged at the middle part, and the rear part extends out of the shell 2 through the exhaust muffler pipe 11 with an opening at the tail end; B. the silencing pipes 6, 12 and 11 are all pipe structures with one ends open and the other ends closed.

Also visible in fig. 3 are: a sound absorbing material 9 and a guard plate 8 are provided inside a right end cover 10 at the end of the housing 2.

The purifier consists of a diversion cone 3 and a three-way catalytic converter 4, wherein the front end of the diversion cone 3 is provided with an air inlet pipe 1, and the three-way catalytic converter 4 at the rear end of the diversion cone 3 is fixed in the shell 2 through a support plate 13 and is communicated with the chamber I.

The total area of the small holes 15 on the pipe walls of the middle muffling pipes 6 and 12 and the exhaust muffling pipe 11 is larger than the sectional area of the pipe; the total cross-sectional area of each of the intermediate muffling pipes 6 or 12 is larger than the cross-sectional area of the intake pipe 1.

As shown in fig. 4: the middle muffling pipes 6 and 12 are distributed in the shell 2 in a radial direction, wherein the head ends of the front middle muffling pipes 12 and 12' are open, and the tail ends are closed; the head ends of the rear middle muffling pipes 6 and 6' are closed, and the tail ends are opened; all the muffling tubes are supported and fixed by more than two points.

As illustrated in fig. 3: the middle muffling pipes 6 and 12 are arranged on the partition plates 5 and 7 and positioned in the chamber II, wherein the middle muffling pipes 12 and 12 'with the openings at the head ends extend into the chamber I, and the middle muffling pipes 6 and 6' with the openings atthe tail ends extend into the chamber III. The axial lines of the air inlet pipe 1, the flow guide cone 3, the three-way catalytic converter 4, the middle muffling pipes 6 and 12 and the exhaust muffling pipe 11 are all parallel to the axial line of the shell 2. The utility model discloses a theory of operation:

the utility model discloses an intake pipe 1 is connected with the automobile engine discharge pipe, and its discharge pipe is exhaust muffler pipe 11 promptly and is connected with the tail pipe, and in the atmosphere of discharging into side by side. After high-temperature high-speed pulse gas discharged by an engine enters an air inlet pipe 1, a flow guide taper pipe 3 and a three-way catalytic converter 4 of the silencer, under the action of a catalyst, chemical reaction is accelerated, wherein: ；；； . The CO, HC and NOx in the exhaust gas are reduced so that national emission regulations can be satisfied. The noise is reduced by the flow of air exiting a large number of square holes in the three-way catalytic converter 4 (which is commercially available directly) and expanding, buffering and filtering in the I-chamber. The gas then exits through the small holes in the intermediate muffler tubes 12 and 12' connected at chamber I, II and enters chamber IIExpansion, the direction of the air flow changes by 90 degrees; similarly, the airflow is sucked from the small holes of the middle muffling pipes 6 and 6' connecting the cavity II and the cavity III, enters the cavity III to expand, and the direction of the airflow changes by 90 degrees; finally, the air is sucked by the small hole on the exhaust silencing pipe 11 and is discharged into the atmosphere. Because theair inlet pipe 1, the diversion cone 3, the three-effect catalytic converter 4, the middle muffler pipe and the discharge muffler pipe 11 are all arrangedThe silencer is connected with the cavities I, II and III in series and part of the silencer is connected in parallel, the throttling action of small holes on the silencer and the pipe wall and the 'gas storage and pressure storage' action of the cavities I, II and III transform high-speed pulsating gas flow into stable gas-speed gas flow, and noise is reduced; because each silencing tube changes the flow direction of the airflow by 90 degrees multiplied by 4 to 360 degrees, the airflow and the sound flow are partially separated, and a phase difference is formed, the attenuation coefficient of the sound wave is increased, and the noise is reduced; the small hole of the three-way catalytic converter 4 is 1mm²The square holes and the small holes on the silencing pipes are phi 4-

phi

5, and 1 large air flow can be dispersed into hundreds of small air flows, so that the noise is reduced; the air flow and the outflow of the noise sound wave are time-differential due to the small holes on the silencing pipe. Therefore, noise can also be reduced by using the phase difference. Finally, due to the action of the sound absorption material, the medium and high frequency components of the discharged noise are further reduced, and the sound quality is good.

Claims

1. The utility model provides an electricity spouts gasoline car exhaust purification silencer, includes casing (2), left end lid (14), right-hand member lid (10), baffle (5, 7) and has the muffler pipe of aperture (15), its characterized in that: A. in the shell (2), the front part is provided with a purifier, the middle part is provided with middle silencing pipes (6, 12), and the rear part extends out of the shell (2) through an exhaust silencing pipe (11) with anopening at the tail end; B. the muffling pipes (6, 12 and 11) are all pipe structures with one ends open and the other ends closed.

2. An electronic fuel injection vehicle exhaust gas purification muffler as claimed in claim 1, wherein: a sound absorption material (9) and a guard plate (8) are arranged on the inner side of a right end cover (10) at the tail end of the shell (2).

3. An electronic fuel injection vehicle exhaust gas purification muffler as claimed in claim 1, wherein: the purifier consists of a diversion cone (3) and a three-effect catalytic converter (4), wherein an air inlet pipe (1) is arranged at the front end of the diversion cone (3), and the three-effect catalytic converter (4) at the rear end of the diversion cone (3) is fixed in the shell (2) through a support plate (13) and is communicated with the chamber I.

4. An electronic fuel injection vehicle exhaust gas purification muffler as claimed in claim 1, wherein: the total area of the small holes (15) on the pipe walls of the middle muffling pipes (6, 12) and the exhaust muffling pipe (11) is larger than the sectional area of the pipe; the total cross-sectional area of each middle muffling pipe (6 or 12) is larger than that of the air inlet pipe (1).

5. An electric fuel injection vehicle exhaust gas purification muffler according to claim 1 or 4, characterized in that: the middle muffling pipes (6, 12) are distributed in the shell (2) in a radial direction, wherein the head ends of the front middle muffling pipes (12, 12') are open, and the tail ends are closed; the head ends of the rear middle silencing pipes (6 and 6') are closed, and the tail ends of the rear middle silencing pipes are opened; all the muffling tubes are supported and fixed by more than two points.

6. An electronic fuel injection vehicle exhaust gas purification muffler as set forth in claim 5, wherein: the middle muffling pipes (6, 12) are arranged on the partition plates (5, 7) and are positioned in the chamber II, wherein the middle muffling pipes (12, 12 ') with the openings at the front ends extend into the chamber I, and the middle muffling pipes (6, 6') with the openings at the tail ends extend into the chamber III.

7. An electronic fuel injection vehicle exhaust gas purification muffler as set forth in claim 3, wherein: the axial leads of the air inlet pipe (1), the flow guide cone (3) and the three-effect catalytic converter (4) are all parallel to the axial lead of the shell (2).

8. An electronic fuel injection vehicle exhaust gas purification muffler as claimed in claim 1, wherein: the axial leads of the middle muffling pipes (6, 12) and the exhaust muffling pipe (11) are parallel to the axial lead of the shell (2).