KR100733654B1 - Swirl flow type of catalyst converter - Google Patents

Abstract

A catalyst converter of swirl flow type is provided to install the catalyst converter close to an exhaust port for quickly activating a catalyst by using an exhaust gas of high temperature. A catalyst converter of swirl flow type includes a manifold(4), a first exhaust pipe(3a), and second exhaust pipes(3b,3c,3d). The first exhaust pipe are elongated from the exhaust manifold, connects to a center of a cross section of manifold side of the catalyst converter, and induces a line flow of exhaust gas by using the catalyst in the catalyst converter. The second exhaust pipe are elongated from the exhaust manifold, connects to an external surface of the catalyst converter with a prescribed inclination angle, and induces a swirl flow of the exhaust gas through the catalyst in the catalyst converter.

Description

Swirl flow type of catalyst converter

1 is a view schematically showing the configuration of an exhaust system used in a conventional automobile.

2 is a view schematically showing the configuration of a vortex flow type catalytic converter according to the present invention.

3 is a view schematically showing the configuration of a vortex flow type catalytic converter according to the present invention applied to a six-cylinder type engine.

* Description of the symbols for the main parts of the drawings *

1: catalytic converter 2: catalyst

3a, 3b, 3c, 3d: exhaust pipe 4: exhaust manifold

The present invention relates to a catalytic converter of a motor vehicle, and more particularly, in the vortex flow mode, in which the exhaust gas is uniformly passed through the entire surface of the catalytic converter when the exhaust gas is discharged, thereby increasing the purification efficiency of the exhaust gas. It relates to a catalytic converter.

In general, the engine is a mixture of the fuel supplied from the fuel device and the air sucked through the intake unit is sucked into the engine, and is to be burned in the combustion chamber. And, the exhaust gas generated when the mixer is burned is discharged to the outside through the exhaust gas discharge device.

The exhaust gas discharge device will be described with reference to FIG. 1.

In Fig. 1, reference numeral 101 denotes an exhaust manifold, 102 a catalytic converter, and 103 and 104 a muffler.

In the conventional exhaust gas discharging system configured as described above, the opening amount of the throttle valve is determined by the operation of the accelerator pedal, not shown, and the mixer corresponding to the operation amount of the accelerator pedal is sucked into the combustion chamber of the engine. The output of the engine can be obtained by the combustion of the mixer sucked into the combustion chamber of the engine under the control of the ignition device, where the exhaust gas containing carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), etc. Is generated and discharged from the engine to the exhaust magfold 101.

As described above, the exhaust gas discharged to the exhaust maggie fold 101 is discharged to the muffler 103 through the catalytic converter 102 provided adjacent to the exhaust manifold 101. At this time, the catalytic converter 102 reduces carbon monoxide, hydrocarbons, and nitrogen oxides in the exhaust gas into carbon dioxide, water vapor, oxygen, and nitrogen and discharges them to the mufflers 103 and 104 by means of granular or honeycomb catalysts installed therein.

On the other hand, the exhaust manifold 101 is the first place where the mixer is exploded in the engine and the exhaust gas is discharged from the cylinder of the engine, and the engine returning to the intake, compression, explosion, and exhaust stroke is, for example, 4 In four individual cylinders, they explode in the order of 1-3-4-2. After the explosion of cylinder 1, the exhaust gas is discharged from cylinder 3 and cylinder 4 after cylinder 2. The exhaust valve is opened before the piston fully retracts, and is further opened (overlap) for a short time even after the intake valve is opened to suck in fresh air so that exhaust gas in the cylinder is completely discharged.

However, since the conventional catalytic converter flows at a high speed from the exhaust manifold having a small diameter to the catalytic converter having a relatively large diameter, it does not diffuse to the entire area of the catalyst in the catalytic converter and is concentrated in the center of the catalyst. As a result, not only the exhaust gas purification efficiency by the catalytic converter is lowered, but also the life of the central catalyst is lowered.

In addition, the temperature of the central portion of the catalyst where the exhaust gas is concentrated is high, while the temperature of the peripheral portion of the catalyst is low, due to the generation of thermal stress due to the temperature non-uniformity, cracking occurs in the catalyst, thereby improving the purification efficiency of the exhaust gas. There was a problem that the degradation, the engine performance due to the increase in the back pressure and the catalyst life is reduced.

Therefore, an object of the present invention is to improve the purification efficiency of the catalyst by inducing the smooth diffusion of the exhaust gas through the vortex flow of the exhaust gas, the vortex flow method that can extend the durability and life of the catalyst due to temperature unevenness and thermal stress To provide a catalytic converter.

A vortex flow type catalytic converter according to the present invention for achieving the above object is a catalytic converter connected to an exhaust manifold installed in an engine to purify the exhaust gas discharged from the engine, the catalyst converter extending from the exhaust manifold to the catalyst A first exhaust pipe connected to the center of the end face of the manifold side of the converter and directing the exhaust gas to a catalyst provided inside the catalytic converter; And a plurality of second exhaust pipes extending from the exhaust manifold and obliquely connected to the outer circumferential surface of the catalytic converter at a predetermined inclination angle, and inducing the vortex flow flow to the catalyst provided inside the catalytic converter. It is characterized by including.

In addition, it is preferable that two or three second exhaust pipes are connected to the outer circumferential surface of the catalytic converter at equal intervals.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a view schematically showing the configuration of a vortex flow type catalytic converter according to the present invention.

As shown in FIG. 2, the catalytic converter 1 according to the invention has a plurality of exhaust pipes extending from the exhaust manifold 4 for discharging the exhaust gas discharged from the cylinder of the engine to the catalytic converter 1. Runner pipes 3a, 3b, 3c and 3d are connected. According to the invention, the first exhaust pipe 3a is connected to the center of the end face 1a of the manifold side of the catalytic converter 1, and the plurality of second exhaust pipes 3b, 3c, 3d are predetermined angles from each other. It is connected to the outer peripheral surface of the catalytic converter 1 to achieve.

The first exhaust pipe 3a, which is connected to the end face of the catalytic converter 1 on the exhaust manifold side, is first connected to the first cylinder for discharging the exhaust gas. Therefore, the exhaust gas discharged from the cylinder 1 flows into the catalytic converter 1 in a linear flow manner through the exhaust pipe 3a, and the exhaust gas is discharged after the exhaust gas is discharged from the cylinder 1, 2, 3, Second exhaust pipes 3b, 3c, 3d connected to cylinders 4 are connected to the outer peripheral surface of the catalytic converter 1 to form a vortex in the catalytic converter 1.

As described above, since the exhaust pipes 3b, 3c, 3d connected to the cylinders 2, 3, 4 are connected to the outer circumferential surface of the catalytic converter 1, the catalytic converters through the exhaust pipes 3b, 3c, 3d The exhaust gas flowing into the (1) forms a vortex along the inner surface of the casing of the catalytic converter 1 in the catalytic converter 1, and thus the exhaust pipes 3b, 3c connected to the cylinders 2, 3 and 4 By the exhaust gas flowing into the catalytic converter 1 through 3d, the exhaust gas introduced into the catalytic converter 1 through the exhaust pipe 3a connected to the first cylinder is exhaust pipes 3b, 3c, and 3d. Through the exhaust gas flowing into the catalytic converter 1 in the vortex form in the catalytic converter 1. By such a vortex flow of the exhaust gas, the exhaust gas discharged from the engine comes into contact with the entire inlet side surface of the catalyst 2 provided in the catalytic converter 1, and the catalyst 2 is preheated by the exhaust gas, whereby the catalyst Converter 1 can be activated.

On the other hand, the exhaust pipes 3b, 3c, 3d are preferably arranged to be connected to the outer peripheral surface portion of the catalytic converter 1 which can be more easily installed in the catalytic converter 1. Therefore, the exhaust pipes 3b, 3c, 3d are connected at intervals of approximately 90 ° to the outer circumferential surface of the catalytic converter 1 so that manufacturing can be made easier when installed on the outer circumferential surface of the catalytic converter 1.

In addition, when the exhaust pipes 3b, 3c, and 3d are connected to the outer circumferential surface of the catalytic converter 1, the exhaust pipes 3b, 3c, and 3d are connected to the outer circumferential surface of the catalytic converter 1 at a predetermined angle so as to flow into the catalytic converter 1. While backflow of the exhaust gas can be prevented, the vortex flow generated in the catalytic converter 1 contacts the catalyst 2 over a larger area, thereby allowing the exhaust gas to pass through the catalyst 2 more. It can be discharged through a large area part.

Figure 3 is a schematic diagram showing the configuration of each of the vortex flow type catalytic converter according to the present invention applied to a six-cylinder type engine.

As shown in FIG. 3, in the case of a six-cylinder vehicle, two manifolds 4, each of which three exhaust pipes are connected to each cylinder, are connected to two catalytic converters 1 (only one each in the figure). Shown), the first exhaust pipe 3a is connected to the end face of the manifold of the catalytic converter 1 like a four-cylinder vehicle, and the two second exhaust pipes 3b and 3c are connected to the catalytic converter 1. It is connected to the outer circumference at an angle of 180 °. In this way, by connecting the exhaust pipes 3a, 3b, 3c to the catalytic converter 1, vortices are formed in the catalytic converter 1 as in a four-cylinder vehicle, and exhaust gas is formed on the entire surface of the catalyst 2. By passing through the catalyst 2 in contact with each other, the exhaust gas purification efficiency and durability of the catalyst 2 can be improved.

According to the vortex flow type catalytic converter according to the present invention having the structure as described above, not only can be installed in a narrow space, but also can be installed close to the exhaust port, so that the catalyst is activated in a short time with a high temperature exhaust gas. It is possible to improve the purification efficiency of the catalyst by inducing the smooth diffusion of the exhaust gas through the vortex flow of the exhaust gas, and to satisfy the exhaust gas regulation value that the catalyst front area simultaneously reaches the activation temperature and strengthens during the initial cold start-up. And prolong the durability and life of the catalyst due to temperature irregularities and thermal stresses.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention should be construed that all changes or modifications derived from the meaning and scope of the appended claims and their equivalents, rather than the detailed description, are included in the scope of the present invention.

Claims (2)

In the catalytic converter connected to the exhaust manifold installed in the engine to purify the exhaust gas from the engine, A first exhaust pipe extending from the exhaust manifold and connected to the center of the end face of the manifold side of the catalytic converter, for directing a straight flow flow to the catalyst provided inside the catalytic converter; And A plurality of second exhaust pipes extending from the exhaust manifold and obliquely connected to the outer circumferential surface of the catalytic converter at a predetermined inclination angle and directing the exhaust gas to a catalyst provided in the catalytic converter. A vortex flow type catalytic converter, characterized in that the. The method of claim 1, The second exhaust pipe is a vortex flow type catalytic converter, characterized in that two or three are connected to the outer peripheral surface of the catalytic converter at equal intervals.

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