KR20020043800A - Exhaust gas of catalytic converter for vehicle - Google Patents

Abstract

PURPOSE: An exhaust gas cleaner for a vehicle is provided to improve the quality and durability of an exhaust gas cleaner by preventing the corrosion of a mat and to reduce the production cost by excluding an inner end cone and improving an outer end cone. CONSTITUTION: An end portion(42) of an end cone(40) of an exhaust gas cleaner(30) is bent toward the inner portion of a shell(33). The first bent portion(43) contacts an end portion(41) of the shell. A second bent portion(44) is formed by bending the first bent portion in the lengthwise direction of the shell. The second bent portion contacts the inner surface of a mat(32). Since the mat is separated from exhaust gas, the corrosion of the mat is avoided.

Description

Exhaust gas of catalytic converter for vehicle

The present invention relates to an exhaust gas purification device for an automobile, and more particularly, to an improvement in an end cone provided to connect an exhaust manifold and an exhaust pipe to both sides of an exhaust gas purification device for purifying harmful gas remaining in exhaust gas. will be.

When the vehicle exhaust gas purification device explodes by mixing fuel and air to obtain the thrust necessary for driving a car, combustion gas is generated during this explosion process, and harmful substances contained in the combustion gas are immediately released to the atmosphere to prevent air pollution. It is installed to prevent causing.

As described above, the exhaust gas generated by the combustion of the engine is discharged by mixing carbon monoxide and hydrocarbons, which are harmful gases, and nitrogen oxides, water vapor and carbon dioxide, which are harmless gases.

Carbon monoxide, a noxious gas, is a colorless and odorless gas generated when oxygen is depleted. If such carbon monoxide is released into the atmosphere in an unpurified state, it causes oxygen deficiency in the body inhaling the gas.

In the case of nitrogen oxides, irritating odors are harmful gases, which are the main cause of photochemical smog, and in the case of hydrocarbons, gases or particulates of compounds generated by incomplete combustion of fuel are collectively referred to.

When these hydrocarbons are released to the air without purification, they are decomposed or chemically reacted to the atmosphere, rather than direct air pollution by hydrocarbons, to provide photochemical smog.

As described above, the exhaust gas purification apparatus is configured to purify the harmful gas component contained in the exhaust gas discharged from the engine to reduce the harmful gas such as carbon dioxide, water vapor, oxygen, and nitrogen and release it into the atmosphere.

The exhaust gas purifier is a device for purifying harmful gases by using catalysts such as platinum, rhodium, and palladium, which are reaction promoters that help the reactants to oxidize and reduce reactions under appropriate conditions without changing themselves.

The conventional exhaust gas purifier 10 as described above is provided with a shell 13 in which a catalyst 11 and a mat 12 are installed inward, as shown in FIG. 1, and on both sides of the shell 13. An end cone 16 having an inlet 14 for exhaust gas inlet and an outlet 15 for discharging the purified exhaust gas to a muffler or the like is connected.

The end cone 16 includes an out end cone 17 and an inner end cone 18, and the inner end cone 18 indicates that the mat 12 supporting the catalyst 11 is corroded by the exhaust gas. It is installed to reduce the internal temperature while preventing.

However, in the warm-up type purifier, the distance between the engine and the purifier is short, so that the mat performs corrosion and temperature reduction. However, the underfloor purifier has a far distance from the engine. Only inner end cones exist for this purpose.

For this reason, when the inner end cones are deleted, the mats are corroded by the exhaust gas, which is inconvenient to use the mats that are not affected by the corrosion to prevent corrosion of the mats.

As described above, when omitting the inner end cone, there is a problem of using an expensive mat for solving the corrosion of the mat, and when the inner end cone is left as it is, the exhaust gas purifier itself has a complicated structure. There are many problems such as high cost and difficulty in manufacturing.

Therefore, in the present invention to solve the problems described above, by using the general mat to remove the inner end cone and improve the out end cone to prevent the exhaust gas to contact the mat to prevent corrosion of the mat to exhaust gas purification apparatus It is aimed at contributing to the improvement of quality and durability, and to the cost savings required to manufacture exhaust gas purifier.

1 is a partial cross-sectional view of a vehicle exhaust gas purification apparatus to which the prior art is applied.

2 is a partial cross-sectional view of a vehicle exhaust gas purification apparatus to which the technique of the present invention is applied.

Figure 3 is a partial cross-sectional view of the vehicle exhaust gas purification apparatus to which another embodiment of the present invention is applied.

* Description of the symbols used in the main parts of the drawings *

30; Exhaust Gas Purification System

31; catalyst

32; mat

33; Shell

40; End cone

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the preferred embodiment of the present invention for achieving the above object.

2 is a partial cross-sectional view of a vehicle exhaust gas purification device to which the technique of the present invention is applied, and FIG. 3 is a partial cross-sectional view of a vehicle exhaust gas purification device to which another embodiment of the present invention is applied. .

The conventional exhaust gas purifying apparatus 30 includes a shell 33 having the catalyst 31 and the mat 32 installed therein, and both sides of the shell 33 have an inlet 34 for exhaust gas inflow. An end cone 40 having an outlet 35 for discharging the purified exhaust gas to a muffler or the like is connected.

In the present invention, it is characterized in that the exhaust gas is not transmitted to the mat 32 by using the out-end cone while omitting the inner end cone of the end cone 40.

To this end, in the present invention, the end portion 42 of the end cone 40 is connected to the shell portion 33 so that the end portion 41 of the shell 33 covering the catalyst 31 and the mat 32 can be connected to each other. The first bent portion 43 bent inwardly is formed.

The first bent portion 43 again has a second bent portion 44 bent in the longitudinal direction of the shell 33 so as to be in contact with the inner surface of the mat 32.

The end portion 41 of the shell 33 and the outer diameter portion of the first bent portion 43 of the end cone 40 are fixed by welding 45 to prevent the flow of the end cone 40 and the second bent portion 44. It is possible to easily hold the mat (32).

As another example of the end cone 40,

After the outer diameter of the end cone 40 to have the same size as the inner diameter of the shell 33, the end 50 of the end cone 40 is bent in the inner direction of the shell 33 and then the bent end 51 ) Is in contact with the outer diameter end 52 of the catalyst (31).

The outer diameter of the end cone 40 may be fixed by welding 45 in a state where the end portion 41 of the shell 33 is covered.

The present invention as described above;

While the inner end cones are omitted from the components of the end cone 40 forming the inlet 34 and the outlet 35 at both sides of the exhaust gas purifying apparatus 30, the inlet exhaust gas can be prevented from being transferred to the mat 32. By doing so, it is possible to prevent corrosion of the mat 32.

In particular, by manufacturing the exhaust gas purifying device 30 in the state in which the inner end cone is omitted, the number of related parts can be reduced, thereby reducing the production cost due to the reduction of raw materials and the reduction of the manufacturing process.

As described above, the present invention eliminates inner end cones while using general mats and improves out end cones so that the exhaust gases do not touch the mats, thereby preventing corrosion of the mats, contributing to improving the quality and durability of the exhaust gas purifying apparatus, and It can contribute to the cost reduction required for manufacturing gas purifier, and has many effects.

Claims (4)

A shell 33 provided with the catalyst 31 and the mat 32 inwardly; Both sides of the shell 33 are connected to an end 34 having an inlet 34 for exhaust gas inlet and an outlet 35 for discharging the purified exhaust gas to a muffler or the like. In device 30; A first bent portion (43) formed by bending an end portion (42) of the end cone (40) in an inward direction of the shell (33) so that the end portion (41) of the shell (33) can be connected; The first bent portion 43 is bent in the longitudinal direction of the shell 33 again to form a second bent portion 44 to be in contact with the inner surface of the mat 32 to transfer the exhaust gas to the mat 32. Automobile exhaust gas purification apparatus, characterized in that not be. The method of claim 1; The outer diameter of the end cone 40 has the same size as the inner diameter of the shell 33; Bending the end portion 50 of the end cone 40 inwardly of the shell 33; The bent end 51 is in contact with the outer diameter end 52 of the catalyst 31 and inserted into the mat inside the exhaust gas purification apparatus for a vehicle. The method of claim 1; An exhaust gas purification device for an automobile, characterized in that the welding portion (45) is fixed to the end portion (41) of the shell (33) and the first bent portion (43) of the end cone (40). The method of claim 2; The exhaust gas purification apparatus for automobiles, characterized in that the welding 45 is fixed to the outer diameter of the end cone 40 in a state where the end portion 41 of the shell 33 is coated.