KR800000515B1 - Apparatus topurify exhaust gas for multi-cylinder internal combustion engine - Google Patents

Abstract

Each cylinder of an I. C. V-8 engine is provided with a main combustion chambustion chamber(5) and an auxiliary combusstion chamber(7) connected by a torch opening(6). An exhaust reaction chamber assembly(25) is positioned between the two banks of cylinders(2) and is provided with a liner(28) having a first reaction chamber therein. Four exhaust tubes(24) each connected to receive exhaust gases from two adjcent cylinders(2) project into the reaction chamber.

Description

Exhaust purifier of multi-cylinder internal combustion engine

The figure shows a V-type multi-cylinder internal combustion engine equipped with the present invention.

1 is a transverse front view.

2 is a longitudinal front view.

3 is a plan view of the main portion vertically.

The present invention relates to an exhaust purification apparatus of a so-called V-type multi-cylinder internal combustion engine in which two rows of cylinder bacteria are arranged in a V-shape, and mainly to an apparatus that can be reduced by exhaust combustion of carbon monoxide in exhaust.

In order to achieve efficient combustion of these devices, it is necessary to gradually increase the volume of each part from the exhaust duct of each cylinder to the reburn chamber to give an adequate expansion ratio to the exhaust and to keep the exhaust residence time as long as possible. Particularly important and the rapid expansion of the exhaust should be avoided, if possible, because it greatly reduces the exhaust temperature.

An object of the present invention is to provide an electric apparatus which can obtain a good exhaust reburn effect in view of the above points.

Referring to the embodiment of the present invention with reference to the drawings, 1 is a so-called engine body of a V-shaped eight-cylinder internal combustion engine, and is constituted by a V-shaped arrangement of two groups of cylinder groups A and B.

Each cylinder A, B has a common cylinder head 3, which corresponds to the cylinder 2, which forms the main combustion chamber 5 and the subcombustion chamber 7 communicating with the torch nozzle 6 through it, and the electrode 8 is the subcombustion chamber before ignition. It is screwed into the cylinder head 4 to reach seven. The main intake chamber 9 and the exhaust port 10 are opened in the main combustion chamber 5, and the intake intake port 11 is opened in the sub combustion chamber 7, respectively. Intake valve 14 is mounted.

The intake manifold 15 connected to the main and sub intake ports 9 and 11 is used as an object of the exhaust assembly body 17 installed in the V-shaped groove 16 in the center of the engine main body 1, and the vaporizer 18 is mounted on the top thereof. The vaporizer 18 has a main intake port 19, 11 for producing a lean mixer and a rich intake tank 20 for producing a rich mixer, and inserts 19,0 into the main and intake ports 9,11 via a predetermined intake path of the intake manifold 15. I communicate with each other.

In the figure, 21 denotes a piston and 22 denotes a crankshaft. In the inhalation stroke of the engine, the lean mixer produced in the main intake cylinder 19 is distributed to each main intake port 9 by the intake manifold 15 to be supplied to each main combustion chamber 5, and the rich mixer generated in the intake cylinder 20 The same intake manifold 15 is supplied to each subcombustion chamber 7. At the end of the compression stroke, the rich mixer in the subcombustion chamber 7 is first ignited by the discharge flame of the pre-ignition 8 to ignite into a flame, and the flame is ejected to the main combustion chamber 5 through the torch nozzle 6 and burned therein. The trachea is moved to an expansion stroke. In this way, the engine is operated by a mixer in which the total air-fuel ratio is thinner than the theoretical air-fuel ratio, and the exhaust contains extremely low content of harmful components such as nitrogen oxides, hydrocarbons, and carbon monoxide, and the excess oxygen in the lean mixer is mixed at a high temperature. As a result, the exhaust reacts with the surplus oxygen at the exit to each exhaust port 10 and reburn commences. Further, in the first exhaust period 23 embedded in the cylinder head 3, the exhaust gas is led to the second exhaust pipe 24 through which the side walls of the exhaust assembly body 17 and the exhaust reburn chamber 25 accommodated therein pass.

The first exhaust pipe 23 is prepared one for each exhaust port 10, that is, a total of eight, but the second exhaust pipe 24 is prepared one for each of the two first exhaust pipes 23 adjacent to each other in the same cylinder head 3, that is, a total of four have. The volume of only one second exhaust pipe 24 is larger than that of one first exhaust pipe 23. The two second exhaust pipes 24, which face each other, are connected to each other by filling the open ends and communicating with the exhaust reburn chamber 25 through a common outlet 26 formed by cutting a part of each open end.

Therefore, the exhaust from the adjacent tanks 2 flows into the second exhaust pipe 24 which is common to each other through the respective first exhaust pipes 23 due to different exhaust times, and some flows through the outlet 26 into the exhaust reburn chamber 25. The remainder flows into the opposing second exhaust pipe 24. Thus, the two sets of the second exhaust pipes 24 facing each other expand the exhaust properly and serve as the exhaust reburn chamber. In particular, since the exhaust reburn chamber is always heated to a high temperature by the exhaust heat from the four exhaust cylinders 2 surrounding it, the reburn reaction is vigorously performed even at low load operation of an engine having a small exhaust flow rate. The exhaust is then also given adequate expansion in the exhaust reburn chamber 25 and eventually exits the atmosphere past the silencer, not shown at exit 27.

Thus, during the exhaust port 10 to the exhaust reburn chamber 25, the expansion of the exhaust is staged and the residence time is long, so the reburn is always continued, and particularly, the carbon monoxide reduction in the exhaust is severe.

In the present invention, since the path from each exhaust port 10 to the exhaust reburn chamber 25 is always maintained at an active temperature, the following thermal insulation means is taken.

First, annular air layers 28 and 29 are formed on the outer periphery of the first and second exhaust pipes 23 and 24, and dissipation of the exhaust heat to the cylinder head 3 and the exhaust assembly body 17 can be prevented. The main part of the wall of the exhaust reburned body 25 is composed of three heat resistant metal plates, and an air layer 30 and a ceramic layer 31 for thermal insulation are formed between the respective metal plates. The exhaust bath reburn chamber 25 is further divided into a first chamber 25a on the inside and a second chamber 25b on the outside by the enclosure 32 surrounding the entire second exhaust pipe 24. Both chambers form a perforation 33 under the enclosure 32. Exhaust gas communicated through and discharged from the through hole 33 is directed to the opposite side of the electric outlet 27 by the airflow guide plate 34 which is addressed to the lower surface of the enclosure 32. When the second chamber 25b flows, the exhaust gas flows along the entire outer circumferential surface of the enclosure 32 as indicated by the arrow in FIG. 2, and the exhaust flow ensures that the first chamber 25a and the second exhaust pipe 24 therein are kept warm. . Such accurate heat preservation and adiabatic results in good exhaust reburn cycles even during low load operation of engines with low exhaust temperatures.

In addition, in the present invention, in order to promote the vaporization of fuel particles in each mixer produced in the vaporizer 18, the exhaust heat in the exhaust reburn chamber 25 is used. That is, the lower part of the central part of the intake manifold 15 faces the recessed part 35 formed in the upper surface center part of the exhaust reburn chamber 25, and a part of the exhaust gas passing through the upper part of the second chamber 25b passes through the inlet and outlet 36,37 of the rear wall. By the exhaust, the central portion of the intake manifold 15 can be heated to vaporize fuel particles in each mixer reliably. In addition, the exhaust does not cause a large heat loss in the exhaust reburn chamber 25 by heating the intake manifold 15 since the reburn is almost finished. However, in order to prevent heat conduction from the first chamber 25a to the recesses 35, the bottom wall of the recesses 35 has a double structure and an air insulating layer 38 for insulation is formed in the middle.

Claims (1)

In a multi-cylinder internal combustion engine in which two rows of cylinder groups are arranged in a V shape, the exhaust recombustion body is accommodated in an exhaust assembly body provided in a V-shaped groove between both cylinder groups, and each exhaust group is provided in the exhaust recombustion body. The exhaust gas of the multi-cylinder internal combustion engine which injects common exhaust pipes which are communicated with two adjacent exhaust ports of each other, communicates mutually opposite exhaust pipes with each other, and communicates with the electric exhaust reburning body through a common outlet. Purifier.

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