SU897118A3 - Exhaust collector of internal combustion engine - Google Patents

Description

(St) EXHAUST COLLECTOR OF INTERNAL COMBUSTION ENGINE

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The invention relates to mechanical engineering, in particular to internal combustion engines, and can be used in exhaust gas disposal devices.

Known exhaust manifold of the internal combustion engine, containing a heat-insulated casing, equipped with inlet ports and one exhaust window, and a cylindrical container with a catalyst in it. The known exhaust manifold reduces the content of toxic substances in the exhaust gases of the internal combustion engine 1.

A disadvantage of the known exhaust manifold is the complexity of the design.

The purpose of the invention is to simplify the design.

To achieve this goal, the casing of the proposed exhaust manifold is made of two halves, one of which has an outlet window and the other inlet ports

and a hole with a lid, and the container is placed between the halves coaxially with the outlet window and fixed to the lid.

The cylindrical container may be made in the form of two coaxially. Perforated cylinders, the space between which is filled with a catalysts.

Figure 1 shows the exhaust manifold of an internal combustion engine, general view; figure 2 - the same

J5 top view; figure 3 is the same cross section; figure 4 - section aa in figure 2; in Fig.5 a cylindrical container with a catalyst; figure 6 install the exhaust manifold on

20 an internal combustion engine; - FIG. 7 is a diagram of the connection of temperature and oxygen concentration sensors and a computer to an internal combustion engine equipped with

25 exhaust manifold; Fig. 3 shows the dependence of the degree of neutralization of exhaust gases on the distance between the cylinders of a cylindrical container with a catalyst; Fig. 9 shows the dependence of the temperature of the catalyst bed on the injection of secondary air. The exhaust manifold of the internal combustion engine comprises a casing 1 made of the upper 2 and lower 3 halves and provided with a thin heat shield k made of heat resistant steel material. A cylindrical container 6 is placed coaxially between the top 2 and bottom 3 halves of the exhaust window 5. In the cylindrical container 6, a cavity 7 and an annular space 8 are made, in which catalyst 9 is placed. The cavity 7 is limited by the outer 10 and inner 11 lids a cover 11, a ring 12, internal 13 and external 14 cylinders. The cavity 7 and the annular space 8 are interconnected by drilling 15 made in the inner cover 11. The inner and outer cylinders 13 and 14 are aligned with each other, with the distance between them in the radial direction being 20-30 mm. The inner and outer cylinders are made of louvered tape or similar material and are provided with a large number of perforations with the exception of a few dozens of millimeters, with a lid to the inner lid 11. The lower end of the cylindrical container 6 is installed in the flange 16. The upper half 2 of the case 1 is made an opening with a lid 17, onto which a cylindrical container 6 is fixed. The upper half 2 is provided with impact windows 18 and channels 19 communicated through pressure pipes 20 and valves 21 with a secondary air blower 22 of the spirit. Inlet ports 23 are provided with plugs 24. Over exhaust port 5 in the exhaust pipe is installed, a silencer 25. FIG. 7 shows the use of an exhaust manifold for neutralizing exhaust gases from unburned hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides. (NOjr). 84 Behind the exhaust window 5 of the exhaust manifold, an oxygen concentration sensor 26 is installed, the output signals of which are fed to a computer 27 which regulates the fuel supply. In the cylinder. A container 6 with a catalyst 9 is fitted with a temperature sensor 28 for signaling the occurrence of destructive conditions in the catalyst bed 9. Under such conditions, secondary air is supplied from the secondary air blower 22 through valves 21 to the secondary air discharge tubes 20. When the internal combustion engine is operating, exhaust gases, mixed with secondary air, blown-up secondary air blower 22 through valves 21, discharge pipes 20, channels 19 and air windows 18, are fed through inlet ports 23 with inserts 2k. Then exhaust gases pass through the perforated the outer and inner cylinders 14 and 13 in the annular space 8 of the cylindrical container 6 with the catalyst 9, where they are disposed of and removed through the exhaust port 5 and the silencer 25. The catalyst placed in the cavity 7, is supplied to the annular space 8 as the volume of catalyst 9 decreases in the latter as a result of catalytic action. Thus, with the relatively simple design of the exhaust manifold of the internal combustion, effective disposal of engine exhaust gases is realized. As can be seen from the graph of Fig. 8, the degree of neutralization of exhaust gases increases with increasing distance between the inner and outer cylinders 13 and 14 of the cylindrical container 6 with catalyst 9. A sufficiently high degree of neutralization takes place with a distance between cylinders d 20-30 mm, further an increase in the distance does not lead to a significant increase in the efficiency of exhaust gas disposal. The graph in FIG. 9 shows the change in temperature of the catalyst beds over time. The solid line A shows the dependence of the temperature of the catalyst bed on the time when the secondary air is injected; the dotted line B in the absence of secondary air injection

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of air. The dash-dotted line C shows the critical temperature level of catalyst reliability. As can be seen from the graph, the injection of secondary air contributes to lowering the catalyst temperature j to a safe level.

Claims (2)

Invention Formula 1, The exhaust manifold of an internal combustion engine containing a thermally insulated casing provided with; inlet ports and one outlet port, and a cylindrical co-container with a catalyst disposed therein, characterized in that 84 in order to simplify the construction, the casing consists of two halves, one of which has an outlet window, the other has inlet windows and an opening with a lid, and the container is placed between the halves coaxially with the outlet window and fixed on the lid, 2. A collector in accordance with claim 1, 1, 2 tons and the fact that the cylindrical container is made in the form of two coaxial perforated cylinders, the space between which is filled with a catalyst. Sources of information taken into account in the examination 1. US patent No. 3937Q15, cl. 60-288, publ. 10.02,7b. BUT - srig.2 Aa (rigging 7 JO 15 eight Fig 5 yy 23 25 FIG. 6 H i 1001 i 80I || AC $ 1 I 20M W30 (/ Ttm) The scenery of the internal / l1i and 8 ei / us (4Uffu dpaf4U ffOHmetJHepa lottized eagle FIG. fig L AT .one