KR19990003224U - An engine exhaust structure having a vacuum cover formed in a catalytic converter housing - Google Patents

Abstract

The present invention relates to an engine exhaust structure in which a vacuum cover is formed in a catalytic converter housing. In particular, by mounting a vacuum cover on an outer housing of a catalytic converter, the temperature of the catalytic material is raised in a shortest time, To an engine structure in which a catalytic converter is incorporated in an exhaust manifold.

Description

An engine exhaust structure having a vacuum cover formed in a catalytic converter housing

The present invention relates to an engine exhaust structure in which a vacuum cover is formed in a catalytic converter housing. In particular, by mounting a vacuum cover on an outer housing of a catalytic converter, the temperature of the catalytic material is raised in a shortest time, To an engine structure in which a catalytic converter is incorporated in an exhaust manifold.

1, an intake system includes an air cleaner 1 for removing dust and the like in the air sucked into a cylinder, an intake manifold for distributing a mixture to each cylinder, and the like The exhaust system includes an exhaust manifold 2 for collecting the exhaust gases of the respective cylinders, a catalytic converter 3 for blocking the noxious gas among the exhaust gases, and an exhaust valve 3 for exhausting the exhaust gas to the atmosphere A pipe 4, a muffler 5 for reducing exhaust noise, and the like.

Here, the intake manifold is a tube for introducing a mixer made by a vaporizer into a cylinder by reducing the resistance as much as possible. In a multi-cylinder engine of two or more cylinders, the intake manifold serves to distribute a mixture of uniform quality and quantity to each cylinder.

However, during the cold start of the engine, the fuel injected from the injector provided at the upper end edge of the intake manifold injects the richest fuel due to the low temperature inside the cooling water and the intake port. A part of the exhaust gas is not completely combusted, and the exhaust gas is discharged as it is in an incomplete combustion state.

In order to solve this problem, an exhaust gas recirculation system (EGR) is mounted, and a part of the exhaust gas output from the exhaust port of the engine is recycled to the intake manifold through the recycle pipeline to remove nitrogen oxides Thereby reducing the incidence.

In addition to _{CO 2, H 2 O, N} 2, to install a catalytic converter (3) to the output of the exhaust manifold (2) to emit an exhaust gas harmful to the exhaust gas harmless to the CO, HC, NO _X, as shown in FIG. 2 Redox.

The catalytic converter is made of harmful components such as carbon monoxide, hydrocarbons, and nitrogen oxides generated by incomplete combustion or high temperature combustion of the engine with the aid of a catalyst and discharges it into the atmosphere by making harmless carbon dioxide or water. This device is one in which the reaction is repeated by the self-heating action once the oxidation reaction starts, and there are various catalyst materials such as platinum, cobalt and nickel for oxidizing the exhaust gas.

However, even when the recycle pipeline and the catalytic converter are installed as described above, there is a problem that it is difficult to block the noxious gas generated at the time of warming up the engine.

This is because the temperature of the catalyst converter needs to be raised to about 350 ° C. in order for the converter to perform its function. However, since the temperature of the exhaust gas is low during warm-up of the first vehicle, a certain period of time is required until the optimum operation of the catalytic converter occurs. There is a problem that CO, HC, and NO _x that are harmful to the human body can not be filtered and are released to the outside.

In particular, the catalytic converter is required to maintain a high temperature, but discharges a high temperature to the outside through the housing of the catalytic converter. As a result, the temperature of the exhaust gas passing through the catalytic converter is lowered. All.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems and to provide a catalytic converter capable of effectively performing a purifying operation at the initial warm-up by shutting off the temperature of the catalyst converter from the outside to increase the temperature of the catalytic converter within a short period of time .

As means for achieving the above object,

The present invention is characterized in that a vacuum cover is mounted on the outer housing of the catalytic converter.

1 is a schematic view of a general intake and exhaust device;

2 is a view showing a relationship between a general exhaust pipe and a catalytic converter;

Fig. 3 is an installation structural view of the present invention; Fig.

Description of the Related Art [0002]

1: Air cleaner 2: Exhaust manifold

3: Catalytic converter 3-1: Vacuum cover

4: exhaust pipe 5: silencer

Hereinafter, the present invention will be described in detail with reference to the drawings.

Fig. 3 is a structural view of the present invention. In the exhaust system of an engine having a catalytic converter 3 as an exhaust gas purifying material,

A vacuum cover (3-1) is mounted on the housing of the catalytic converter (3) so as to block the temperature outflow through the housing of the catalytic converter (3), and a cylindrical housing So as to have a vacuum space portion 3-3 between the housing of the catalytic converter 3 and the vacuum cover 3-1.

The present invention as described above supplies the mixed gas to the combustion chamber through the first intake manifold and ignites the mixed gas with the spark plug. Here, the ignited mixed gas applies pressure to the piston to provide power to the engine, and the mixed gas is discharged to the outside through the exhaust manifold.

A part of the exhaust gas, which is to be discharged to the outside through the exhaust manifold 2, is circulated to the intake manifold through the exhaust circulation line and the remaining part of the exhaust gas is discharged through the output end of the exhaust manifold 2. Conventionally, A certain period of time is required until the catalytic converter 3 can be operated efficiently due to heat loss occurring in the housing of the catalytic converter 3 due to the exhaust pipe 4 at the manifold output end and reaching the catalytic converter 3 do.

However, in the present invention, since the vacuum cover 3-1 is formed in the housing of the catalytic converter 3 so as to have the vacuum space portion 3-3 between the housing of the catalytic converter 3 and the vacuum cover 3-1 It is possible to prevent the heat of the exhaust gas flowing through the catalytic converter 3 from being diverted to the outside during the initial warm-up, thereby shortening the time to reach the temperature at which the catalytic action can be most actively performed (about 350 ° C) It is possible to jiggle.

As described above, the present invention provides an effect of increasing the temperature of the catalyst material in the shortest time by mounting a vacuum cover on the outer housing of the catalytic converter, thereby efficiently purifying the exhaust gas.

Claims (1)

1. An exhaust system for an engine having a catalytic converter (3) as an exhaust gas purifying material, A vacuum cover (3-1) is mounted on the housing of the catalytic converter (3) so as to block the temperature outflow through the housing of the catalytic converter (3), and a cylindrical housing And a vacuum space part (3 - 3) is provided between the housing of the catalytic converter (3) and the vacuum cover (3 - 1) so as to be spaced apart from the catalytic converter housing Exhaust structure.