FI124612B - Internal combustion engine - Google Patents

Description

Internal combustion engine machine

The invention relates to a combustion engine machine according to the preamble of claim 1.

5 In heavy-duty diesel engine engines known in the art, crankcase exhaust air is normally discharged untreated into the atmosphere. The same applies to the exhaust air of the exhaust turbocharger of such a large diesel engine engine.

In relatively small internal combustion engine machines, e.g. used in 10 passenger cars or commercial vehicles, it is known in practice to direct the crankcase exhaust air into the oil separator prior to venting to separate the oil or oil mist from the crankcase exhaust air. However, the achievable oil separation rates are limited.

DE 102 004 031 281 A1 discloses a relatively small internal combustion engine machine with a gas turbocharger of a commercial vehicle pa-15 having a device for venting the crankcase air out of the crankcase of the internal combustion engine, whereby the device

From now on, it is an object of the present invention to provide a novel combustion engine machine with a higher oil separation rate. This problem is solved by an internal combustion engine machine according to claim 1.

According to the invention, the device for venting the crankcase air exhaust includes a siphon-like conduit, wherein a siphon-like conduit is provided with a downstream flow of water to direct the water to the vented vented vent,

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^ to drain the aqueous mixture.

° In the internal combustion engine of the invention, the water is led to a siphon-like conduit for the removal of the crankcase exhaust gas, 30 | that is, the downstream flow of the sub-region of the siphon-shaped pipeline.

cd By introducing water into the crankcase exhaust air, partial water

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§ evaporation provides cooling of the crankcase exhaust air. By cooling the crankcase exhaust gas, some of the gaseous oil contained in the crankcase exhaust gas 00 condenses. In addition, water droplets of water introduced into the crankcase are stored in the oil droplets of the crankcase vent gas and form larger droplets by coagulation and coagulation. Thus, the water introduced into the crankcase exhaust gas, on the one hand, transfers the gaseous parts of the crankcase exhaust gas to the liquid phase and, on the other hand, the flowing droplets are magnified. Both effects provide 5 good oil separations from the crankcase exhaust air.

Preferably, the siphon pipeline is guided through the pipeline to the exhaust air turbocharger shutoff air, whereby the exhaust air pipeline ends up in this siphon pipeline upstream of the siphon pipeline.

According to a preferred embodiment of the invention, a non-return valve is connected between the siphon tube and the crankcase of the internal combustion engine to prevent overflow of the resulting oil / water mixture into the crankcase.

Preferred further embodiments of the invention will be apparent from the dependent claims and the following description. Embodiments 15 of the invention will be explained in more detail by way of the drawing without being limited thereto. Here, Figure 1 schematically shows an internal combustion engine machine according to the first embodiment of the invention; Fig. 2 schematically shows an internal combustion engine machine according to another embodiment of the invention; and Figure 3 schematically shows an internal combustion engine machine according to a third embodiment of the invention.

In the following, the invention will be described with reference to Figure 1, simply in the example of exhaust turbocharged internal combustion engines. It should be noted that the invention is not limited to such simply turbocharged combustion engine machines. Rather, the invention can also be used in multiple exhaust turbocharged internal combustion engines, compressed internal combustion engines, otherwise supercharged internal combustion engines, or non-supercharged

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^ on known internal combustion engines. In the case of internal combustion engines, these may be diesel engines, positive ignition engines, HCCI engines or other internal combustion engines.

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However, the internal combustion engine is preferably a heavy oil a powered diesel engine, such as a marine diesel engine.

cd Figure 1 schematically illustrates a first embodiment of the invention, wherein the exhaust stream 11 from the internal combustion engine is directed to and depressurized in the turbine 12 of the exhaust turbocharger 13. The turbine 12 of the exhaust turbocharger 13 drives its compressor 14, whereby the combustion air 15 directed to the combustion engine 10 in the compressor 13 of the turbocharger 13 is compressed. In the compressor 14 of the exhaust turbocharger 13, the compressed combustion air flow 15 is directed to the charge air cooler 16, which cools the compressed combustion air flow, so that the compressed and cooled combustion air flow, also referred to as charge, is exposed.

The internal combustion engine machine of the invention has a device for venting the crankcase air exhaust from the crankcase of the internal combustion engine, wherein the device for venting the crankcase air includes a siphon-shaped conduit 18. The siphonic conduit 18 has two orth through a pipeline portion forming a sub-region 21.

A siphon-shaped conduit, i.e. perpendicular to the conduit portion 20, is provided with a nozzle-shaped water supply device 22 for conducting, i.e. injecting, water into a vented crankcase venting gas 15. The water supply device 22 is preferably configured as a flat nozzle for spraying water with as fine a spray as possible into the crankcase exhaust air. It should be noted that other nozzles, as well as a plurality of nozzle arrangements, may be used to inject water into the perpendicular conduit 20 of the siphon-like conduit 18 for directing the crankcase venting gas. The amount of water and

By injecting water into the crankcase exhaust air, its gaseous constituents are transferred to the liquid phase, since the injected water provides the cooling of the crankcase exhaust air. In addition, the oil droplets contained in the crankcase air exhaust gas are increased because the water droplets are stored by coagulation 5 and coagulation in the oil droplets of the crankcase air exhaust gas.

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^ A valve 24 9 is disposed in the sub-region of the siphon pipeline 18 to drain the oil-water mixture from the area of the siphon pipeline 18 and to guide it to the bottom 25. Valve 24 may be an automatic | an opening valve and an automatically closing valve which is opened and closed ohcd continuously through the liquid surface of a siphon-shaped conduit 18,

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To drain the oil-water mixture formed from the siphon-shaped pipeline 18 to the bottom 25, the oil-water mixture accumulating in the bottom 25 can be removed via a oil separator.

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At least the perpendicular conduit portion 20 of the siphon-like conduit 18 into which the water supply device 22 is located is dimensioned to have a large internal diameter of the flow to provide low flow rates of the vented exhaust air and a large length of the conduit. In this case, it is then ensured that by using gravity alone, without the use of a separate oil separator, a good oil separation from the crankcase air exhaust gas can be ensured. Preferably, a droplet separation grid is located at the downstream end of the conduit portion 20.

According to Fig. 1, a non-return valve 26 is integrated in the siphon-shaped conduit, downstream of the sub-region 21, and thus perpendicular to the conduit portion 19, to prevent the resulting oil / water mixture from overflowing into the crankcase of the internal combustion engine.

The water supplied or injected into the crankcase vent gas through the water supply device 22 may be fresh water, sea water, hot water or also so called. gray water.

Figure 2 shows a preferred extension of the internal combustion engine machine of Figure 1, whereby the same reference numerals are used for the same component structures to avoid unnecessary repetitions. In the exemplary embodiment of Figure 2, the siphon-like conduit 18 can be guided through the conduit 27 by the exhaust air of the exhaust turbocharger 13 to separate the oil therefrom, as well as the crankcase exhaust air. In this case, as shown in Figure 2, the conduit for the exhaust gas ends upstream of the sub-region 21, i.e. upstream of the non-return valve 26, into the siphon-like conduit 18.

To further improve or optimize the oil separation rate according to Figure 25 3, an additional oil separator 28 is provided in the siphon pipeline. This oil separator 28 may be a diffusion separator, a continuity separator, a centrifugal separator, an electric separator or a combination of these separators. In the oil separator cv ^ 28, the separated oil is controllable for removal through the conduit 29 of the bottom 25.

The gas 30 leaving the oil separator 28 can be conducted either to the air 30 or circulated back to the internal combustion engine, in which case the gas 30 is returned to the unpressed compressor and then to the cd internal combustion engine, either downstream of the charge air cooler 16. the size of the compressed and cooled combustion air stream or the charge air cooler § 16 flow upwardly into the compressed and uncooled combustion air stream 35 or also the exhaust gas turbocharger 13 compressor 14 flow upwardly into the uncompressed combustion air flow 15.

Claims (10)

An internal combustion engine, in particular a heavy-oil, large-diesel internal combustion engine with a device for conducting crankcase ventilation gas away from the crankcase of the internal combustion engine, characterized in that the device for conducting crankcase ventilation gas (18) with a siphon-like pipe ( , 20), which are joined to each other by a horizontally running pipe section forming a sub-point region (21), wherein in the siphon-like pipe (18) below its sub-point region (21) Current is placed a nozzle 10 water supply device (22). the auxiliary of which the water can be routed away to the crankcase ventilation gas to be discharged, and in which, in the siphon-like pipe (18), in its sub-point area (21), a valve (24) is placed to divert an oil-water mixture formed, and to the siphon-like pipe (18) can be controlled via pipe the outlet (27) of an exhaust gas discharge charger (13) in the exhaust air gas, the pipeline (27) of the exhaust air gas terminating in the sub-point area (21) of the stream of the siphon-like pipe (18). 2. An internal combustion engine according to claim 1, characterized in that the siphon-like pipe (18) below the sub-point area (21) has a large flow-in diameter for providing low flow rates for the crankcase ventilation gas to be discharged. Internal combustion engine according to claim 1 or 2, characterized in that the siphon-like pipe (18) runs below the current of the sub-point area (21) vertically and in this section has a large pipe length. 25 An internal combustion engine according to any one of claims 1 to 3, characterized in that between the bottom point area (21) of the siphon-like pipeline (18) and the crankcase of the internal combustion engine is coupled a check valve (26) to prevent overflow of the oil-water mixture. \ j crankcase. o 30 An internal combustion engine according to any one of claims 1 to 4, characterized in that an oil separator (28) is placed in the stream of the siphon-like pipe (18) below the supply supply device (22) below. CD o o An internal combustion engine machine according to any one of claims 1 to 5, characterized in that the shut-off gas pipe (27) terminates above the flow of the check valve (26) in the siphon-like pipe (18). An internal combustion engine machine according to any one of claims 1 to 6, characterized by an exhaust turbocharger (13) comprising a turbine (12) and a compressor (15), the exhaust turbocharger's turbine (12) removing the pressure from the exhaust gas which exits from the combustion engine engine exhaust turbine (5). 14) is driven by its turbine (12) and compresses the combustion air stream, whereby a combustion air cooler (16) is coupled between the exhaust turbocharger compressor (14) and the combustion engine machine, and the crankcase ventilation gas separated from the oil can be compressed back via the compressor and . 8. An internal combustion engine according to claim 7, characterized in that the crankcase ventilation gas is conducted below the charge air cooler (16) Current to the compressed and cooled combustion air stream. An internal combustion engine according to claim 7, characterized in that the crankcase ventilation gas is conducted above the current of the charge air cooler (16) to the compressed combustion air stream. An internal combustion engine as claimed in claim 7, characterized in that the crankcase ventilation gas is conducted above the exhaust turbocharger compressor (14) Current to the non-compressed combustion air stream. 't δ c \ j O) o C \ l O X cc CL CD O) CD O 1 ^ O O CM