WO2010048794A1

WO2010048794A1 - A vehicle muffler with reducing exhaust gas

Info

Publication number: WO2010048794A1
Application number: PCT/CN2009/070521
Authority: WO
Inventors: 李定初
Original assignee: 李静
Priority date: 2008-10-31
Filing date: 2009-02-25
Publication date: 2010-05-06
Also published as: CN101446219A; CN101446219B

Abstract

A vehicle muffler with reducing exhaust gas includes a casing. An air inlet pipe (6) is set on the front end of the casing (4) and an air exhaust pipe (7) is set on the rear end of the casing (5). Several levels of partition boards of the muffler pipes (9) are parallel in the casing. The constructions of the partition boards of the muffler pipes (9) are same or different. Wherein the partition board of the muffler pipe (9) is composed of at least one partition board (2) having several install holes and the muffler pipe (1) corresponding to the number of the installing holes. Several leaving air feedback pipes (8) are arranged between the partition boards of the muffler pipes (9). Air holes (21) are equably distributed on every level of the single partition board or the rear partition boards of the double partition boards expect the first level partition board of the single partition board and the front partition board of the double partition board. The vehicle muffler with reducing exhaust gas improves the manufacture and reduces the cost and improves the produce efficiency and the effect of reducing exhaust gas.

Description

Instruction manual

Motor vehicle emission reduction muffler

[1]

[2] The present invention relates to an exhaust gas discharge treatment device, and more particularly to a vehicle emission reduction muffler.

[3] ^ i^

[4] At present, the main method to prevent automobile exhaust pollution is to install a three-way catalytic converter, thereby greatly reducing the content of CO, HC and ΝΟ^ in automobile exhaust. With C0 ₂

The resulting greenhouse effect warms the climate, and new vehicle emission standards for C0 ₂

The emissions are also subject to strict requirements. The three-way catalytic converter has not been able to achieve zero emissions from automobile exhaust. To this end, Chinese patent ZL 03 146969.8

An exhaust gas treatment device named "Integrated Momentum Exchanger for Controlling Vehicle Exhaust Gas Pollution" is disclosed. The device is formed by connecting a plurality of stages of integrated exchangers in parallel, and each stage is provided with an equal number of ones. A highly integrated injection receiving tube, a diffusing tube and a negative hole are formed on the machining plane, and a booster tube or a pressure regulating tube of a parallel injection receiving tube is arranged between the integrated exchangers at each stage. After the vehicle exhaust gas is processed by several stages of the integrated exchanger of the device, the exhaust gas of the vehicle is fully exchanged in the momentum exchanger, and finally the exhaust gas of the vehicle is formed at the end of the momentum exchanger, and no gas is discharged and a certain amount is generated. Suction phenomenon. As a result, the vehicle exhaust is truly solved, and no pollution is emitted to the atmosphere. Really achieve zero emissions of motor vehicle exhaust. However, the above-mentioned exhaust gas treating apparatus has the following drawbacks: 1. Since the receiving pipe and the expanding pipe in the exhaust gas treating device are both in the thickness of 15 to 25 mm

In the steel plate, the hole formed by machine tool cutting and drilling machine is poor in craftsmanship, high in manufacturing cost, and difficult to be industrialized on a large scale. 2. The negative pressure pipe used in the exhaust gas treatment device requires a threaded pipe joint. connection

, because of thermal expansion and contraction, it is easy to cause failure, and the reliability is not high.

[5] Coffee

[6] The technical problem to be solved by the present invention is to make up for the deficiencies of the above prior art, and propose a

Good processability, high reliability, low manufacturing cost, and suitable for large-scale industrial production of motor vehicle emission reduction Device.

[7] The vehicle emission reduction muffler of the present invention is solved by the following technical solutions.

[8] The motor vehicle emission attenuating muffler comprises: a casing composed of an outer cylinder, a front end cover and a rear end cover, the front end cover of the casing is provided with an intake pipe, and the rear end cover of the casing is provided with an air outlet pipe, and a casing There are several levels of muffling pipe baffle assemblies arranged in parallel in the body; the structural specifications of the muffler pipe baffle assemblies of the various levels are the same or different; an air flow chamber is formed between the baffle tube baffle assemblies of each level.

[9] The characteristics of this motor vehicle emission reduction muffler are:

[10] The muffling pipe baffle assembly is composed of at least one baffle having a plurality of mounting holes and a muffling pipe assembly corresponding to the number of mounting holes, and the muffling pipe assembly is inserted into the mounting hole of the baffle plate, And the spot welding is fixed with the partition plate; [11] a plurality of residual gas feedback pipes of different lengths are arranged between the muffler pipe baffle assemblies in the casing, and the two ends of the residual gas feedback pipe of different lengths are respectively eliminated from the front and rear stages. The separator of the sound tube baffle assembly is spot-welded to form a passage between the airflow chambers of the front and rear stages.

[12] The muffling pipe baffle assembly has no venting holes except for the first baffle structure or the double baffle structure front baffle, and the other partitions of the single baffle or double baffle structure The plates are uniformly provided with venting holes.

[13] Further features of the vehicle emission reduction muffler of the present invention are:

[14] The anechoic tube assembly is a conical tube or consists of several conical tubes in series.

[15] The tapered tube wall is uniformly provided with a venting hole.

[16] The conical tube comprises a conical tube having no equal diameter nozzle at both ends or a conical tube having an equal diameter nozzle at both ends or a conical tube having an equal diameter nozzle at one end.

[17] The tapered tube has a thickness of 0.4mm to 1.5mm

Metal sheet stamping or roll forming, or pipe forming, the small diameter of the tapered tube is 2mm~ 30mm, the diameter of the large end is 8mm~100mm, and the length is 20mm~200mm.

The diameter of the gas permeable orifice on the wall of the tapered tube is 1 mm to 6 mm, and the perforation rate is ≤ 15%.

[18] The separator has a thickness of 0.5 mm to 1.5 mm. The gas permeable pore size of the separator is 2 mm to 20 mm, and the perforation rate is ≤ 20%.

[19] The outer diameter of the residual gas feedback tube is 6 mm to 30 mm, and the wall thickness of the tube is 0.5 mm to 1.0 mm.

[20] The practical size of the motor vehicle emission reduction muffler can be determined according to the space left by the motor vehicle to the exhaust system and the parameters of the engine. [21] The general principle is that the small displacement of the motor vehicle engine is thinner and smaller, and the material used for the large displacement is thicker and larger.

[22] The various levels of the muffling pipe baffle assembly for the vehicle emission reduction muffler of the present invention are stamped or rolled from a thin steel plate and a pipe member, which overcomes the need in the prior art at 1 5 to 25 mm.

The thick steel plate is processed by the numerical control drilling machine with the taper hole, the process is complicated, and the manufacturing cost is high, which not only reduces the equipment investment, but also increases the production efficiency, increases the waste gas conversion space, and improves the exhaust gas conversion efficiency. In the inner side of the muffler, a reasonable amount of residual gas feedback pipe with different lengths is arranged to replace the negative pressure pipe (feedback pipe) connected with the front stage and the front stage in the prior art, which eliminates the need for thread for installing the negative pressure pipe. The trouble of the pipe joint connection eliminates the failure of the negative pressure tube thermal expansion and contraction, and it can easily optimize the path of the residual gas feedback to the front stage.

[23] The working principle of the vehicle emission attenuating muffler of the present invention is: connecting the vehicle emission attenuating muffler to the exhaust port of the motor vehicle engine, and the exhaust gas discharged by the motor vehicle is passed through the hollow wall of the muffler inlet pipe through the pipe wall. In the tube, the inner wall of the conical tube generates a negative pressure, and the gas outside the conical tube wall flows into the conical tube through the inlet end surface of the conical tube and the small hole in the conical tube wall. The space outside the wall of the conical tube also creates a negative pressure. Since the flow rate of the exhaust gas discharged from the motor vehicle is higher than the flow rate of the first stage separator, the pressure of the muffler is more negative than that of the previous chamber. Then, the gas in the latter cavity flows into the front cavity through the vent hole in the partition, and the gas in the subsequent cavity flows into the front cavity through the residual gas feedback pipe. Thus, an infinite number of circulating airflow vortices are formed in the entire space inside the muffler. The entire space inside the muffler is a negative pressure (vacuum) area. In the process of continuously and repeatedly generating airflow vortices in the negative pressure (vacuum) region, the exhaust of the motor vehicle is gradually submerged (disappeared) in the device, and the emission reduction or even zero emission of the exhaust gas is achieved. Since the airflow passes through the conical tube, it has undergone multiple stages, multiple expansions, resonances, and interference, and its noise reduction effect is also particularly good.

[24] The beneficial effects of the present invention are:

[25] The vehicle emission reduction muffler of the invention overcomes the defects of the prior art complicated process and high manufacturing cost, improves the processability, reduces the equipment investment, reduces the cost, improves the production efficiency, and increases the exhaust gas conversion space. Improve the efficiency of waste gas conversion and emission reduction, and accelerate the process of large-scale industrialization.

[26] National Gang

1 is a schematic longitudinal sectional structural view of a motor vehicle emission attenuating muffler of the present invention; [28] FIG. 2 is a cross-sectional view showing the AA cross-sectional view of the vehicle muffler of the motor vehicle shown in FIG.

[29] FIG. 3 is a cross-sectional view showing the structure of the vehicle-reducing muffler of FIG.

[30] Figure 4a is a schematic cross-sectional structural view of a conical tube of a motor vehicle attenuating muffler;

[31] FIG. 4b is a schematic cross-sectional structural view of another tapered tube of a vehicle emission attenuating muffler;

[32] Figure 4c is a schematic cross-sectional view of a tapered tube of a motor vehicle emission muffler;

[33] Figure 5 is a schematic cross-sectional view of a plurality of conical tubes in series;

6 is a schematic longitudinal sectional structural view of Embodiment 2 of a vehicle emission attenuating muffler of the present invention;

[35] Figure 7 is a cross-sectional view of the C--C of the vehicle muffler muffler shown in Figure 6;

[36] FIG. 8 is a schematic cross-sectional view showing the D--D of the vehicle muffler of FIG.

[37] FIG. 9 is a schematic longitudinal sectional structural view of a third embodiment of a vehicle emission attenuating muffler of the present invention;

[38] FIG. 10 is a cross-sectional view showing the structure of the E--E of the vehicle-reducing muffler shown in FIG. 9;

[39] Fig. 11 is a cross-sectional structural view of the F--F of the vehicle-reducing muffler shown in Fig. 9.

[40] In the figure: anechoic tube assembly 1. Conical tube with equal diameter tube at both ends 11 a, conical tube l ib

a conical tube 11c having a constant diameter tube at one end, a gas permeable orifice 12, a separator 2, a front partition 2a, a rear partition 2b, a vent hole 21, a mounting hole 22, a large diameter mounting hole 22a, and a small diameter mounting hole 22b, outer cylinder 3, front end cover 4, rear end cover 5, intake pipe 6, air outlet pipe 7, residual gas feedback pipe 8

, anechoic diaphragm separator assembly 9, air flow chamber 10

[41] Specific implementation:

[42] Example 1: From Figure 1, Figure 2 and Figure 3

It can be clearly seen that the vehicle emission attenuating muffler comprises: a casing composed of an outer cylinder 3, a front end cover 4 and a rear end cover 5, the front end cover 4 of the casing is provided with an intake pipe 6, and the rear end cover 5 of the casing is provided With air outlet 7

, a plurality of stages are arranged in parallel in the casing by a single piece of partition plate 2 and a plurality of muffling pipe assemblies 1

The anechoic tube spacer assembly 9 is constructed. Silent tube baffle assemblies at all levels 9

The basic structural specifications are the same, except for the separator of the first stage muffler diaphragm assembly 9

Outside the ventless holes, the venting holes are provided on the partitions 2 of the other levels of the anechoic tube spacer assembly 9

The air chamber 10 is formed between the silencer tube partition assemblies of the respective stages; the residual sound feedback tube 8 of different lengths and shorts is arranged between the sound-absorbing tube partition assemblies 9 in the housing, and the residual gas feedback tubes 8 of different lengths are provided. The partition and the partition of the front and rear stage muffling pipe baffle assembly 9 respectively The spot welding connection forms a passage between the air flow chambers 10 of the front and rear stage muffling pipe baffle assemblies 9.

[43] The muffling tube assembly 1 of the present embodiment is composed of a single conical tube 1 ib (as shown in FIG. 4b), and the conical tube l ib is a conical tube having no equal-diameter nozzles at both ends. Metal sheet roll forming, conical tube l ib

There are ventilation holes 12 on the pipe wall,

[44] The partition plate 2 is stamped from a thin steel plate, and the partition plate 2 is regularly provided with a sound absorbing tube assembly 1

Inserted mounting hole 22, tapered tube l ib inserted in mounting hole 22, and partition 2

Spot welding fixed connection.

[45] The tapered tube with no equal diameter nozzle at both ends has a thickness of 0.6 mm

The sheet metal roll is made with a small diameter of 10 mm and a large diameter of 16 mm. The length is

40mm, the air permeable aperture on the wall of the tapered tube is 3mm, and the perforation rate is ≤ 15%.

[46] The thickness of the separator 2 is 1.0 mm, and the pore diameter of the separator 2 is 3 mm, and the perforation rate is ≤

20%.

[47] The outer gas feedback tube 8 has an outer diameter of 10 mm and a tube wall thickness of 1.0 mm.

[48] Example 2: From Figure 6, Figure 7, and Figure 8

The structure and embodiment of the vehicle emission reduction muffler can be clearly seen.

basically the same. The only difference is that a plurality of stages of the anechoic tube spacer assembly 9 composed of the front partition 2a, the rear partition 2b and the plurality of anechoic tube assemblies 1 are arranged in parallel in the housing. gP: The spacing between the front baffle 2a and the rear baffle 2b is slightly smaller than the length of the muffling pipe assembly 1. The muffling pipe assembly 1 of the present embodiment is a single conical tube 1 lb, and the front baffle 2a is provided with a regular cloth. The large-diameter mounting hole 22a is inserted into the tapered tube 1 lb, and the rear partition 2b is provided with a small-diameter mounting hole 22b corresponding to the large-diameter mounting hole 22a of the front partition _2a . The tapered tube 1 lb is inserted into the large-diameter mounting hole 22a of the front partition 2a and the small-diameter mounting hole 22b of the rear partition 2b, and is spot-welded and fixed to the front partition 2a and the rear partition 2b.

[49] The rear partition 2b is uniformly provided with a vent hole 21 therein.

[50] The tapered tube 1 lb without the equal diameter nozzle at both ends has a thickness of 0.6 mm

[51] The thickness of the front baffle 2a and the rear baffle 2b are both 0.8 mm, and the gas permeable aperture of the rear baffle 2b is

3mm, perforation rate ≤ 20%. [52] The outer gas feedback tube 8 has an outer diameter of 10 mm and a tube wall thickness of 1.0 mm.

[53] Example 3: From Figure 9, Figure 10 and Figure 11

Basically the same, several stages are arranged in parallel in the housing from the front partition 2a, the rear partition 2b and a plurality of anechoic tube assemblies

1 composed of a muffler diaphragm assembly 9. The only difference is: anechoic tube assembly 1

A plurality of conical tubes 11a (see Fig. 4a) having equal diameter nozzles at both ends are formed in series. As shown in Fig. 5, a gap is left between the tapered tubes 11a having equal-diameter nozzles at both ends and fixed to the weld.

[54] The anechoic tube assembly 1 can also be constructed in series with a conical tube 11c having an equal diameter nozzle at one end.

[55] The tapered tube 1 la with equal diameter nozzles at both ends has a thickness of 0.6 mm

The metal sheet is formed into a roll having a small mouth diameter of 10 mm, a large mouth end diameter of 16 mm, and a length of 40 mm. The gas permeable aperture on the wall of the tapered tube is 3 mm, and the perforation rate is ≤ 15%.

[56] The front baffle 2a and the rear baffle 2b each have a thickness of 0.8 mm, and the rear baffle 2b has a gas permeable pore diameter of 3 mm and a perforation rate of ≤ 20%.

[57] The outer gas feedback tube 8 has an outer diameter of 10 mm and a tube wall thickness of 1.0 mm.

The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments, and it is not intended that the specific embodiments of the invention are limited to the description. For those skilled in the art to which the present invention pertains, the architectural form can be flexibly varied without departing from the inventive concept, and a series of products can be derived. It is to be understood that only a few simple deductions or substitutions are intended to be included in the scope of the invention as defined by the appended claims.

Claims

Claim

[1] A vehicle emission attenuating muffler, comprising: a casing composed of an outer cylinder, a front end cover and a rear end cover, the front end cover of the casing is provided with an intake pipe, and the rear end cover of the casing is provided with an air outlet pipe, and a casing There are several levels of muffling pipe baffle assemblies arranged in parallel in the body; the structural specifications of the muffler pipe baffle assemblies of the various levels are the same or different. Its characteristics are:

The anechoic tube baffle assembly is composed of at least one baffle having a plurality of mounting holes and a damper tube assembly corresponding to the number of mounting holes, and the anechoic tube assembly is inserted into the mounting hole of the baffle, and is separated Plate spot welding fixed connection;

a plurality of residual gas feedback tubes are disposed between the sound absorbing tube baffle assemblies of the stages;

The muffling pipe baffle assembly is provided with a single baffle or a double baffle structure. Venting hole

[2] The motor vehicle emission attenuating muffler according to claim 1, wherein:

The anechoic tube assembly is a conical tube or consists of a plurality of conical tubes in series.

[3] The motor vehicle emission attenuating muffler according to claim 2, wherein:

The tapered tube wall is uniformly provided with a gas permeable aperture.

[4] The motor vehicle emission attenuating muffler according to claim 1, wherein:

The conical tube comprises a conical tube having no equal diameter nozzle at both ends or a conical tube having an equal diameter nozzle at both ends or a conical tube having an equal diameter nozzle at one end.

[5] The motor vehicle emission attenuating muffler according to claim 3, wherein:

The tapered tube is from 0.4mm to 1.5mm

Metal sheet stamping or roll forming, or pipe forming, the small diameter of the tapered tube is 2mm~ 30mm, the diameter of the large end is 8mm~100mm, the length is 20mm~200mm, the air permeability on the wall of the tapered tube is small. The hole diameter is 1 mm to 6 mm, and the perforation rate is ≤ 15%.

[6] The motor vehicle emission attenuating muffler according to claim 1, wherein:

The separator has a thickness of 0.5 mm to 1.5 mm. The venting orifice of the separator has a pore diameter of 2 mm to 20 mm' perforation rate ≤ 20%.

[7] The motor vehicle emission attenuating muffler according to claim 1, wherein:

The outer diameter of the residual gas feedback tube is 6mm~30mm, and the wall thickness of the tube is 0.5mm~1.0mm.