KR19990051674A - Catalytic converter for automotive engines - Google Patents

Abstract

The present invention forms a vortex chamber in which a first catalyst is embedded in a catalytic converter, and a secondary air supply is provided on one side of the catalyst converter to supply outside air to the exhaust gas passing through the first catalyst to promote oxidation of the catalyst. The present invention relates to a catalytic converter of a vehicle engine capable of suppressing the discharge of gas as much as possible. The catalytic converter of the vehicular engine has an inlet port 30a through which the exhaust gas flows from the engine and an outlet port 30b for discharging the exhaust gas toward the silencer, and at an intermediate point between the inlet port 30a and the outlet port 30b The housing 30 in which the 30c was formed, the 1st catalyst 56 provided in the vortex chamber 30c, the 2nd catalyst 60 arrange | positioned behind this 1st catalyst 56, It is disposed opposite to the second catalyst 60, and is attached to one side of the housing 30 by a secondary air pipe 52 through which external secondary air passes, and a bolt 38, and receives external air. It consists of a secondary air supply for supplying to the second catalyst 60 through the secondary air pipe (52).

Description

Catalytic converter for automotive engines

The present invention relates to a catalytic converter of a vehicle engine, and more particularly, an exhaust gas having passed through the first catalyst by forming a vortex chamber in which the first catalyst is embedded in the catalytic converter and installing a secondary air supply on one side thereof. The present invention relates to a catalytic converter of a vehicular engine capable of maximizing the emission of harmful gases by supplying outside air to promote oxidation of the catalyst.

In general, when the exhaust gas of a vehicle is classified according to the emission source, the exhaust gas of the fuel and air mixture is combusted in a cylinder and then released into the atmosphere through an exhaust pipe, and the evaporation gas and piston from which gasoline in the fuel tank is evaporated. The gap between the cylinder wall and the cylinder can be divided into a blow-by gas in which the combustion chamber's mixer or unburned gas flows into the crankcase.

Among them, the exhaust gas discharged from the engine through the exhaust manifold contains a large number of harmful gases, and in order to prevent environmental pollution, these harmful gases are treated by a catalytic converter before being released into the atmosphere and are harmless. Should be converted to and released.

1 is a configuration diagram showing an exhaust system of a typical vehicle. An intake manifold 4 is provided at one side of the engine 2 to supply external air, and at the other end of the intake manifold 4, combustion gas combusted from the cylinder is discharged as the exhaust valve is opened. The manifold 6 is attached. The exhaust gas discharged from the exhaust manifold 6 flows into the catalytic converter 20 through the front exhaust pipe 10.

The catalytic converter 20 removes harmful substances contained in the exhaust gas by the redox reaction, and the exhaust gas passing through the catalytic converter 20 passes through the silencer to reduce the exhaust sound, and then the rear exhaust pipe 16. Is discharged to outside. The front end of the catalytic converter 20 is coupled to the front exhaust pipe 10 via the gasket 12, and the rear end is coupled to the rear exhaust pipe 16 via the gasket 14.

2 is a perspective view showing a conventional catalytic converter cut out. The catalytic converter 20 is formed with an inlet 20a through which the exhaust gas flows from the engine side, and an outlet 20b through which the inflow exhaust gas is discharged. A catalyst 26 of a ceramic carrier is provided therein. The catalyst 26 is supported by the mat 24 as a support.

In the conventional catalytic converter of a vehicle engine having such a configuration, the exhaust gas passes directly on the mat and corrodes, thereby causing wear and damage of the catalyst. In addition, since the introduction of secondary air is not appropriate, the oxidation efficiency is low, and since the exhaust gas flow at the catalyst inlet is laminar flow, the contact area between the exhaust gas and the catalyst is limited, thereby lowering the purification efficiency.

In order to solve this problem, the present invention forms a vortex chamber in a part of the catalytic converter to provide vortex to the exhaust gas to increase the contact area, and at the same time, it is external to the exhaust gas passing through the first catalyst installed in the vortex chamber. It is an object of the present invention to provide a catalytic converter of a vehicle engine that can further supply the secondary air of the gas and the air mixture to be supplied to the second catalyst to increase the purification efficiency.

1 is a block diagram showing a catalytic converter of a conventional vehicle engine

Figure 2 is a perspective view showing a conventional catalytic converter cut out

Figure 3 is a cross-sectional view showing the configuration of the catalytic converter according to the present invention

[Explanation of symbols on the main parts of the drawings]

30: housing 30a, 30b: inlet, outlet

30c: Vortex chamber 32, 34: Front, rear flange

36: Case 40: Cover

42: Air inflow hole 44: Filter

46: Complete 46a: Supply Hole

48: lead valve 50: stopper

52: secondary air pipe 54: air throttle

56: first catalyst 58: mat

60: second catalyst 62: end seal

An object of the present invention described above is a catalytic converter of a vehicle engine that removes harmful substances contained in exhaust gases combusted and discharged in a cylinder, and exhausts the inlet and inlet exhaust gas from the engine toward the silencer. At the intermediate point between the inlet port and the outlet port, a housing is formed with a vortex chamber, a first catalyst installed in the vortex chamber, a second catalyst disposed behind the first catalyst, and the second catalyst It is arranged to face each other, the secondary air pipe through which the external secondary air passes, attached to one side of the housing by the bolt, the secondary air supply for supplying the external air to the second catalyst through the secondary air pipe It is achieved by a catalytic converter of a vehicle engine comprising a.

Hereinafter, a catalytic converter of a vehicle engine according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a cross-sectional view showing the configuration of a catalytic converter according to the present invention. A front flange 32 coupled to the front exhaust pipe is attached to the front end of the housing 30 constituting the catalytic converter, and a rear flange 34 coupled to the exhaust pipe connected to the silencer is attached to the rear end. have. In addition, an inlet port 30a through which the exhaust gas flows from the engine is formed at the front end, and an outlet port 30b is formed at the rear end to discharge the introduced exhaust gas.

In the middle of the housing 30 having the inlet port 30a and the outlet port 30b, a vortex chamber 30c for providing vortices to the exhaust gas is formed, and the first catalyst 56 is formed in the vortex chamber 30c. Is installed. The first catalyst 56 has a shape in which the cross section increases from the front side to the rear side so that the exhaust gas introduced through the inlet port 30a flows in the radial direction along the vortex chamber 30c.

The second catalyst 60 disposed behind the first catalyst 56 has a shape substantially similar to that of a conventional ceramic carrier catalyst, and is supported on the inner surface of the housing 30 via the mat 58. . End seals 62 are fitted at both ends of the mat 58 to prevent the exhaust gas from directly contacting the mat 58.

It is disposed to face the second catalyst 60, the front end of the secondary air pipe 52 through which the external secondary air passes is connected to the secondary air supply. The rear end of the secondary air pipe 52 is provided with an air control plate 54 for controlling the secondary air flowing from the outside is sufficiently mixed with the exhaust gas to form a turbulent flow.

Looking at the overall configuration of the secondary air supply for supplying external air to the second catalyst 60 through the secondary air pipe 52, it is attached to one side of the housing 30 by the bolt 38, In the case 36 is attached to the cover 40, the inlet hole 42 is formed, and the dust and foreign matter contained in the case 36 is removed in the air flowing through the inlet hole 42 Complete 46 having a filter 44, a supply hole 46a for sending air passing through the filter 44 to the secondary air pipe 52, and a lid for opening and closing the supply hole 46a of the complete 46. It consists of the valve 48 and the stopper 50 which restrains the opening limit of the reed valve 48 uniformly. Here, the stopper 50 serves to prevent damage to the reed valve 48 in addition to regulating the opening limit of the reed valve 48.

By supplying the surplus oxygen to the catalytic converter through the secondary air supply of this configuration it is possible to accelerate the oxidation of the catalyst. Here, the complete 46 is formed by bonding a rubber sheet to the aluminum body, and a plurality of supply holes 46a are formed to supply air passing through the filter 44 to the catalytic converter 42. The reed valve 56 enables the outside air to flow through the supply hole 46a, while preventing the air of the exhaust manifold from being discharged to the outside through the filter 50.

The process of purifying exhaust gas using the catalytic converter having such a configuration will be described.

The exhaust gas flows through the inlet port 30a formed in front of the housing 30 and is supplied to the first catalyst 56 built in the vortex chamber 30c. The first catalyst 56 is sent to the next second catalyst 60 in a state where the harmful gas is first removed. At this time, the outside air introduced through the inlet hole 42 formed in the cover 40 of the secondary air supplier passes through the filter 44 to the secondary air pipe 52 through the supply hole 46a of the complete 46. Supplied. The air introduced into the secondary air pipe 52 is mixed with the exhaust gas passing through the first catalyst 56 while being converted into turbulent flow as it comes into contact with the air control plate 54 installed at the rear end.

The mixer in which the exhaust gas and the outside air are mixed is supplied to the second catalyst 60 to perform the second purification. In this process, surplus oxygen is introduced into the second catalyst 60 by external air supplied through the secondary air pipe 52 to promote oxidation.

According to the present invention described above, since the first catalyst is built in the vortex chamber formed in a part of the catalytic converter, the vortex is provided to the exhaust gas to increase the contact area between the catalyst and the exhaust gas, By installing a secondary air supply and additionally supplying external secondary air to the exhaust gas passing through the first catalyst installed in the vortex chamber, a mixture of exhaust gas and air can be supplied to the second catalyst to increase the purification efficiency. There is an advantage.

Claims (5)

In the catalytic converter of a vehicle engine that removes harmful substances contained in exhaust gas discharged by combustion in a cylinder, A housing having an inlet port 30a through which exhaust gas flows from the engine and an outlet port 30b for discharging the introduced exhaust gas toward the muffler, and between the inlet port 30a and the outlet port 30b, the vortex chamber 30c is formed. 30), A first catalyst 56 provided in the vortex chamber 30c, A second catalyst 60 disposed behind the first catalyst 56, A secondary air pipe 52 disposed to face the second catalyst 60 and having external secondary air passing therethrough; It is attached to one side of the housing 30 by a bolt 38, and includes a secondary air supply for supplying external air to the second catalyst 60 through the secondary air pipe (52) Catalytic converter of a vehicle engine characterized in that. The method of claim 1, The second catalyst 60 is supported on the inner surface of the housing 30 through the mat 58, the end engine 62 is attached to both ends of the mat (58). Catalytic converter. The method of claim 1, The rear end of the secondary air pipe 52 is provided with an air control plate 54 for controlling the secondary air flowing through the supply hole 46a is sufficiently mixed with the exhaust gas to form a turbulent flow Catalytic converter for automotive engines. The method of claim 1, The first catalyst 56 has a shape in which the cross section increases from the front side to the rear side so that the exhaust gas introduced through the inlet port 30a flows in the radial direction along the vortex chamber 30c. Catalytic converter of the engine. The method of claim 1, The secondary air supplier is fixed to the housing 30 by a bolt 38, one end of the case 36 is attached to the cover 40 having the inlet hole 42, A filter 44 which is embedded in the case 36 and removes dust or foreign matter contained in air introduced through the inlet hole 42; A complete 46 having a supply hole 46a for sending air passing through the filter 44 to the secondary air pipe 52; A reed valve 48 for opening and closing the supply hole 46a of the complete 46; Catalytic converter of a vehicle engine, characterized in that consisting of a stopper (50) to constantly restrain the opening limit of the reed valve (48).