JPS5844211A - Purifying device of exhaust gas from engine - Google Patents

Abstract

PURPOSE:To purify exhaust gas without causing the deterioration of a catalyzer function, by dividing manifolds into two groups, providing two catalyzers in a place not decreased with temperature of the exhaust gas, flowing the exhaust gas of an engine in the two catalyzers and contacting the catalyzers to the exhaust gas at high temperature. CONSTITUTION:Exhaust from the first cylinder and fourth cylinder of an engine flows together at a meeting point 24, while exhaust from the second cylinder and third cylinder flows together at a meeting point 26, to flow in through catalyzers 30, 34 and exhaust pipes 42, and is discharged from a combined exhaust pipe 60. That is, exhaust gas is discharged from each exhaust port of the engine through pipes 12, 14, 16, 18 in accordance with a firing order of each cylinder. The catalyzers 30, 34 are provided in a housing part 32 of a manifold 10, located in a position not far from a combustion chamber discharged with each exhaust gas, and the exhaust gas is still at sufficient temperature in this place. Accordingly, sufficient temperature of the catalyzer can be obtained for displaying a function of the catalyzers 30, 34.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust gas purifying device for an engine, and more particularly, to an exhaust gas purifying device for an engine having a dual type flow/tonneau drain in the exhaust pipe.

Conventionally, in exhaust gas purification systems for engines equipped with dual-type 70-ton exhaust pipes, two
A catalyst for purifying exhaust gas was placed downstream from the merging point of the exhaust gas. On the other hand, due to the trend towards lower fuel consumption of engines, the amount of exhaust gas is reduced, and the heat energy of the exhaust gas is also reduced.As a result, the catalyst installation position of the exhaust gas conversion device of the conventional engine is In this case, problems arise such as a decrease in catalyst temperature and a deterioration in warm-up performance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine exhaust gas purification device that prevents a decrease in catalyst temperature.

The present invention provides a plurality of exhaust ports of a combustion chamber of a multi-cylinder engine. The first group of exhaust ports are communicated with the first pipe to join the exhaust gases of the first group of exhaust ports,
The exhaust ports of the second group are communicated with the second pipe to join the exhaust gas from the second exhaust partner, and the exhaust gas of the second group is connected to the second pipe. In an engine exhaust gas purification device that communicates the second pipe with one pipe to combine the exhaust gas from the first and second pipes, s * i - from the second group of exhaust ports. Since exhaust gas purification catalysts are placed at each confluence of exhaust gases, the exhaust gas still retains sufficient heat at the locations where the catalysts are placed, so the catalyst temperature decreases. The function of the catalyst can be fully demonstrated without any

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the engine exhaust gas saponification device according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, the structure of an embodiment of the present invention used in a four-cylinder engine is shown partially in section.

That is, the exhaust manifold 10 has four pipes 12° and 14
．． 16 and 18, the pipe 12 communicates with the exhaust port of the combustion chamber of the first cylinder (not shown), the pipe 14 communicates with the exhaust port of the combustion chamber of the second cylinder, and the pipe 16 communicates with the exhaust port of the combustion chamber of the third cylinder. In addition, the pipe 18 communicates with the exhaust port of the combustion chamber of the $4 cylinder. Tubes 12, 14, 16.18
A common 7 flange 20 is formed at the upper fL11iI end of the flange 20, and this flange 20 is bolted to the cylinder head of an engine (not shown) using a plurality of melt holes 22.

In the exhaust manifold 10, a pipe 12 connected to the first cylinder and a pipe 18 connected to the fourth cylinder are joined at a merging section 24, and a pipe 14 connected to the second cylinder and a pipe 18 connected to the third cylinder are joined together. It merges with the connected pipe 16 at a junction 26. The reason why the snow 12 and the pipe 18 are connected and the pipe 14 and the pipe 16 are connected is to take into consideration the ignition order of each cylinder and to prevent exhaust gas interference from each cylinder. Furthermore, a storage part 28 is formed in the merging part 24, and a catalyst 30 for purifying exhaust gas, such as a three-way catalyst, is arranged in the merging part 24.
6, a storage section 32 is also formed, and a catalyst 34 is arranged in this storage section 32.

A seven flange 36 is formed at the downstream end of the exhaust manifold 10, and a dual type front pipe 38 is connected to the seven flange 36. That is, the front pipe 38 is composed of an upstream section 40 manufactured by casting and a downstream section s42 formed of pipe material. A seven flange 44 is formed at the upstream end of the upstream portion 40 of the front pipe 38, and the seven flange 44 is connected to the flange 36 of the exhaust manifold 1'0. The downstream end of the upstream section 40 of the front knob 38 has seven langes 46.
is formed, and this flange 46 is connected to a flange 48 formed at the upstream end of the downstream portion 42. A 1 flange 50 is formed at the downstream end of the downstream portion 42 of the front nozzle 7 tube 38, and a 7 flange 62 of a line tube 60 is connected to this flange 50. It is now connected.

The operation of the embodiment according to the present invention constructed as described above is as follows. Exhaust gas is discharged from each exhaust port of a multi-cylinder engine (not shown) via pipes 12, 14, 16, and 18 degrees in accordance with the ignition order of each cylinder. Catalyst 30.
34 is installed in the housing part 32 of the manifold P10, which is a device just after each exhaust gas is discharged from the combustion chamber. The catalyst has a temperature of 30
', sufficient catalyst to perform the functions of 34? ! ! [
In the embodiment shown in FIG. 1, catalyst storage portions 28 and 32 are formed at the lower end of the exhaust manifold 10, but the invention is not limited to this. It is also possible to form a catalyst storage part in the upstream part 40. Furthermore, although the above embodiments have been described with reference to a 4-cylinder engine, the present invention is not limited to engine engines, and the embodiments of the present invention can also be applied to multi-cylinder engines, such as 6-cylinder engines. can.

As explained above, according to the engine exhaust gas purification device according to the present invention, the exhaust gas purification catalyst is placed in a place where the temperature of the exhaust gas does not drop, so that a sufficient catalyst temperature can be obtained, and the catalyst Exhaust gas purification can be configured without reducing functionality.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing the structure of an embodiment according to the present invention.

Claims (1)

[Claims] (1) Multiple exhaust ports of the combustion chamber of a multi-cylinder engine are connected to the first. and a second group, the exhaust ports of the first group are communicated with the first pipe, and the exhaust gases of the exhaust ports of the first group are combined;
The exhaust ports of the 182nd group are communicated with the second pipe, and the exhaust gases of the exhaust ports of the second group are combined, and! s1. 1st. Connect the tube with one tube @1. In the engine exhaust gas purification device that merges the exhaust gas from the second pipe, #11*second
An exhaust gas purification device for an engine, characterized in that an exhaust gas purification catalyst is disposed at each confluence of exhaust gases from a group of exhaust ports.