CN2818812Y

CN2818812Y - Electroplating gasoline purification silencer of vehicle

Info

Publication number: CN2818812Y
Application number: CNU2005200096138U
Authority: CN
Inventors: 林辉江
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-13
Filing date: 2005-07-13
Publication date: 2006-09-20
Anticipated expiration: 2015-07-13

Abstract

The utility model relates to an electroplating gasoline purification silencer of a vehicle, which is characterized in that in a shell body (2), the front part is provided with a purifier composed of a flow guiding cone (4) and a three-efficiency catalytic converter (5), the middle part are provided with intermediate silencing pipes (7, 13), and the back part via an exhaust silencing pipe (9) of which the tail end is provided with an opening extends outside the shell body (2); each of the silencing pipes (7, 9, 13) is of a 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 (12) at the terminal end of the shell body (2) is provided with sound absorbing material (11) and a protective board (10), and an axial line of the purifier is perpendicular to an axial line of the shell body (2) of the silencer. The utility model has the functions of silencing and purification 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 relevant requirement about limiting value of exhaust and the noise of China, but also can meet the requirement about the installation position of a postposition engine vehicle.

Description

Purifying silencer for gasoline-injected automobile

The technical field is as follows:

the utility model relates to a silencer, especially an electricity spouts gasoline car 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 II chamber inflation of getting into through air vent 10, get into the atmosphere by the blast pipe discharge 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 automobile 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; C. 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 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 axial lead of the purifier is vertical to the axial lead of the silencer shell.

The utility model arranges the three-effect catalytic converter in the silencer shell, which can not only ensure the purification before silencing, but also play the role of small hole injection frequency shift; and the mounting requirement of a rear engine automobile can be met, and the mounting space is saved. The purifier is vertically arranged at the front part of the silencer, which is convenient for the installation requirement of a rear engine automobile.

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 the middle muffling 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 axial lead of the middle silencing pipe is parallel to the axial lead of the shell; the axial lead of the exhaust silencing pipe and the axial lead of the shell are on the same straight line.

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 again and 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 silencer with the structure can reduce noise repeatedly in a layered mode, so that the silencing quantity is large.

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 cross-sectional view A-A of FIG. 3;

fig. 5 is a sectional view B-B of fig. 3.

The fifth embodiment is as follows:

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

The purifier consists of a diversion cone 4 and a three-way catalytic converter 5, wherein the front end of the diversion cone 4 is provided with an air inlet pipe 3, and the three-way catalytic converter 5 at the rear end of the diversion cone 4 is fixed in the shell 2 through a support plate 14 and is communicated with the chamber I; the axial lead of the purifier is vertical to the axial lead of the silencer shell 2.

The total area of the small holes 15 on the pipe walls of the middle muffling pipes 7 and 13 and the exhaust muffling pipe 9 is larger than the sectional area of the pipe; the total cross-sectional area of each of the intermediate muffling pipes 7 or 13 is larger than the cross-sectional area of the intake pipe 3.

As shown in fig. 4: the middle muffling pipes 7 and 13 are distributed in the shell 2 in a radial direction, wherein the head ends of the front middle muffling pipes (7 and 7') are opened, and the tail ends are closed; the head end of the rear middle silencing pipe (13, 13') is closed, and the tail end is opened; all the muffling tubes are supported and fixed by more than two points.

As illustrated in fig. 3: the middle muffling pipes 7 and 13 are arranged on the partition plates 6 and 8 and are positioned in the chamber II, wherein the middle muffling pipes (7 and 7 ') with the openings at the head end extend into the chamber I, and the middle muffling pipes (13 and 13') with the openings at the tail end extend into the chamber III. The axial lines of the middle muffling pipes 7, 7 ', 13 and 13' are all parallel to the axial line of the shell 2; and the axial line of the exhaust muffler pipe 9 is also parallel to the axial line of the housing 2, but offset (see fig. 5).

The utility model discloses a theory of operation:

the utility model discloses an intake pipe 3 is connected with the automobile engine discharge pipe, and its discharge pipe is exhaust muffler pipe 9 promptly and is connected with the tail pipe, and in the atmosphere of discharging into side by side. When the high-temperature high-speed pulse gas discharged from the engine entersAfter the air inlet pipe 3, the flow guide taper pipe 4 and the three-way catalytic converter 5 of the silencer, under the action of a catalyst, the chemical reaction is accelerated, wherein: ；；； . The CO, HC and NOx in the exhaust gas are reduced so that national emission regulations can be satisfied. Due to the fact thatA large number of air streams of 1mm or more from a three-way catalytic converter 5 (directly commercially available)²The square small holes are discharged into the cavity I, and the air flow enters the small holes of the middle muffling pipes 7 and 7' to be sprayed after the direction of the air flow is changed by 90 degrees, and is expanded, buffered and filtered in the cavity II; the airflow changes the flow direction by 90 degrees; then, the gas is sucked from the small holes of the middle muffling tubes 13 and 13' of the chamber II and the chamber III and expanded in the chamber III. The air flow direction changes by 90 degrees and then enters the small hole on the exhaust silencing pipe 9, and is exhausted into the atmosphere through the exhaust silencing pipe 9. Because the air inlet pipe 3, the flow guide cone 4, the three-effect catalytic converter 5, the middle muffler pipe and the small holes on the pipe wall discharge the throttling function of the small holes on the muffler pipe and the pipe wall, and the functions of 'air storage and pressure storage' of the cavities I, II and III which are connected in series or partially connected in parallel, the high-speed pulsating air flow is changed into the stable low-speed air flow, and the noise is reduced; because each silencing tube changes the flow direction of the airflow by 90 degrees multiplied by 5 to 450 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; since the three-way catalytic converter 5 is arranged in the cavity I of the silencer, 1mm of the converter 5²The square holes and the phi 4-phi 5 small holes on the pipe wall of the silencing pipe can disperse a large air flow into hundreds of small air flows, so that the noise is reduced; because the small hole air flow on each silencing tube and the outflow of the noise sound wave have phase difference, the noise can be reduced. 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 automobile purification silencer, includes casing (2), left end lid (1), right-hand member lid (12), baffle (6, 8) 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 (7, 13), and the rear part extends out of the shell (2) through an exhaust silencing pipe (9) with an opening at the tail end; B. the silencing pipes (7, 9 and 13) are all pipe structures with one ends opened and the other ends closed; C. a sound absorption material (11) and a guard plate (10) are arranged on the inner side of a right end cover (12) at the tail end of the shell (2).

2. An electric fuel injection automobile purification muffler according to claim 1, characterized in that: the purifier consists of a diversion cone (4) and a three-way catalytic converter (5), an air inlet pipe (3) is arranged at the front end of the diversion cone (4), and the three-way catalytic converter (5) at the rear end of the diversion cone (4) is fixed in the shell (2) through a support plate (14) and is communicated with the chamber I; the axial lead of the purifier is vertical to the axial lead of the silencer shell (2).

3. An electric fuel injection automobile purification muffler according to claim 1, characterized in that: the total area of the small holes (15) on the pipe walls of the middle muffling pipes (7, 13) and the exhaust muffling pipe (9) is larger than the sectional area of the pipe; the total cross-sectional area of each intermediate muffling pipe (7 or 13) is larger than that of the air inletpipe (3).

4. An electric fuel injection automobile purification muffler according to claim 1 or 3, characterized in that: the middle muffling pipes (7, 13) are distributed in the shell (2) in a radial direction, wherein the head ends of the front middle muffling pipes (7, 7') are opened, and the tail ends are closed; the head end of the rear middle silencing pipe (13, 13') is closed, and the tail end is opened; all the muffling tubes are supported and fixed by more than two points.

5. An electric fuel injection automobile purification muffler according to claim 4, characterized in that: the middle muffling pipes (7, 13) are arranged on the partition boards (6, 8) and are positioned in the chamber II, wherein the middle muffling pipes (7, 7 ') with the openings at the front ends extend into the chamber I, and the middle muffling pipes (13, 13') with the openings at the tail ends extend into the chamber III.

6. An electric fuel injection automobile purification muffler according to claim 1 or 3, characterized in that: the axial leads of the middle silencing pipe and the exhaust silencing pipe (9) are parallel to the axial lead of the shell (2).