KR100992057B1 - Internal combustion engine - Google Patents

Abstract

In an internal combustion engine, in which an injection system 1 can be provided with conventional fuels and an alternative to partially replacing them, the contact between the orientation and the parts of the injection system 1 and the resulting wear problems are minimized. In order to reduce the pressure, the conventional fuel pressure source 3 is connected to the fuel pipe 16 via two parallel flow paths 20, 21 with check valves 23, 24 in opposite directions, said The fuel pipe 16 is connected to the orientation tube 17 near the injection nozzle, and the orifice tube 17 has a check valve 25 for opening in the forward direction and is capable of being activated by a cycle of an internal combustion engine. Branched from the circle 7, the pressure of the pressure source 7 opens in the counterflow direction, arranged in the check valve 25 disposed in the orifice tube 17 and the conventional fuel pressure source 3. Open pressure of the nozzle needle 11 that is greater than the opening pressure of the check valve 24 The small.

Description

Internal combustion engine {INTERNAL COMBUSTION ENGINE}

1 is a schematic representation of an injection system according to the present invention.

2 is a partial longitudinal sectional view of the injection valve during the provision of an orientation;

3 shows the device according to FIG. 2 during the spraying process;

4 is a diagram of the spraying process.

<Explanation of symbols for the main parts of the drawings>

1: injection system 2: injection valve

3: injection pump 4: plunger

5: Pump Chamber 6: Orientation Tank

7: pump 8: shut-off valve

9: control device 10: spray nozzle

11: nozzle needle 12: pressure chamber

13: branch pipe 14: joint

15: ring tube 16: fuel tube

17: Orientation Tube 16a, 17a: Hole

16b, 17b: tube section 18, 19: nipple

20, 21: flow paths 23, 24: check valve

The present invention relates to an internal combustion engine, in particular a self-ignition internal combustion engine, by which an injection system can be supplied with conventional fuel and an orientation that partially replaces it.

Orientation is a high yielding and inexpensive fuel. Therefore, it is preferable to use a lot of said fuel. However, the emulsion contains a relatively large amount of wear components that promote wear. Removal of these components is very complex and complete removal is impossible. Therefore, there is a risk of rapid wear inside the injection system when using the emulsion. The result is a relatively short life and high maintenance costs.

An object of the present invention is to enable the use of an emulsion in an internal combustion engine with an injection system while maintaining relatively little wear inside the injection system.

The problem is solved by claim 1.

According to this, an internal combustion engine, in particular a self-ignition internal combustion engine, in which a conventional injection of fuel and an alternative to partially replace it can be provided, the injection system being a pressure source for a conventional fuel which can be activated in a cycle of the internal combustion engine. One or more injection valves capable of providing conventional fuel through a fuel pipe branched from the nozzle, wherein the injection nozzle of the injection valve is closeable by a nozzle needle, the nozzle needle being in communication with the fuel pipe it passes through. Fuel pressure in the pressure chamber can be lifted from its seat against the force of the feedback device, and the conventional fuel pressure source is connected to the fuel line via two parallel flow paths with check valves in opposite directions. The fuel pipe is connected to the orientation tube in the vicinity of the injection nozzle, and the orientation tube is forward A check valve which is open from the pressure source for the orientation which is activated by a cycle of the internal combustion engine, the pressure of the pressure source being arranged in a check valve disposed in the orifice tube and a conventional fuel pressure source It is configured to be larger than the opening pressure of the check valve to open with less than the opening pressure of the nozzle needle.

The wear-promoting emulsion can here push a given amount of conventional fuel out of the injection valve and return it to the associated pressure source without contact with it before the start of the injection process. At this time, there is actually a fluid column of a conventional fuel and an emulsion connected to each other outside the pressure source for the conventional fuel. When the pressure source for conventional fuel is activated and thus the injection pressure is provided to the injection valve, the injection starts. The residual conventional fuel, which is downstream of the connection between the orifice tube and the fuel tube, can be injected first, followed by the orientation and then again. Thus, the measures according to the present invention preferably allow the emulsion which promotes wear to contact only the injection valves which are less sensitive to wear particles, and to keep them away from the pressure sources for conventional fuels which may be injection pumps very sensitive to wear particles. do. By limiting the contact of the emulsion to less sensitive injection valves, the wear problem is relatively low, which preferably reduces maintenance costs and ensures a relatively long life.

Preferred embodiments of such measures are given in the dependent claims. The fuel tube and the emulsion tube may be connected to each other via a ring tube concentric with the nozzle needle inside the injection valve, and one or more branch tubes extending from the ring tube to the pressure chamber branch. This arrangement gives a particularly simple and clear configuration and also leaves a sufficient amount of conventional fuel as a pilot fuel in the pressure chamber and branch at the end of each injection process, which is subsequently pushed by an emulsion Rather than losing, it is injected as a pilot fuel only at the beginning of the next injection process.

Another preferred measure is to include a low pressure pump in which the pressure source for the emulsion is formed as a rotary pump. Pumps of this type wear less than piston pumps. For control, a shutoff valve is installed after the pump, and the control device of the shutoff valve can be operated in a cycle of an internal combustion engine. The low pressure pump can actually be permanently operated.

Preferably, the shut-off valve is controlled such that every cycle of the internal combustion engine is provided with an amount of emulsion at maximum corresponding to the capacity of the fuel tube. This prevents, in a simple manner, the orientation from reaching the fuel source, into the conventional fuel pressure source placed before it.

Another preferred embodiment of the above measures is set forth in the remaining dependent claims and is shown in the following description of the embodiments with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings of the present invention will be described in detail.                     

The main field of application of the invention is an engine operating according to the diesel principle. The basic configuration of such an engine is known and will not be described here in detail.

Each cylinder of such an engine is arranged with an injection system 1 of the type based on FIG. 1. The injection system 1 comprises an injection valve 2. The injection valve 2 can be supplied with a conventional fuel, such as diesel oil, and an oil supply from an associated pressure source, supplied from an associated pressure source. The conventional pressure source for fuel is formed as an injection pump 3 configured in the manner of a high pressure pump in the illustrated embodiment. The injection pump 3 has a piston, so-called plunger 4, which can be driven by an engine cycle, the plunger 4 restricting the pump chamber 5. Instead of an injection pump, a common rail controlled by a valve may be provided.

The pressure source for the emulsion is formed by a pump 7 whose suction side is connected to the emulsion tank 6. The pump may be a rotary pump, preferably a screw spindle pump. A shutoff valve 8 is arranged after the pump 7, which can be controlled on and off in an engine cycle by an associated control device 9. The pump 7 can be driven permanently and given a short-circuit action upon closing of the control valve 8. The control valve 8 is preferably formed of an electromagnetic slide valve.

The injection valve 2 has an injection nozzle 10 in a known manner, which has a nozzle hole that can be closed by the nozzle needle 11. The nozzle needle 11 can be raised from its seat against the force of the return spring device or the like by the fuel pressure in the pressure chamber 1 through which it best appears in FIGS. 2 and 3. The pressure chamber 12 is an area of the joint 14 between the housing of the injection nozzle 10 and the valve housing supporting it, which concentrically surrounds the nozzle needle 11 via an inclined branch pipe 13. It is connected to the ring-shaped tube 15 provided in. A fuel tube 16 extending from a conventional pressure source for fuel and an orientalism tube 17 extending from an pressure source for emulsion pass into the ring tube 15.

The sections of fuel tube 16 and of the emulsion tube 17 leading into the ring-shaped tube 15 are holes 16a or 17a located on the side of the nozzle needle 11 provided in the valve housing of the injection valve 2. And holes 16a or 17a are formed in the tubular section 16b or 17b extending through the associated nipples 18 or 19 to the associated pressure source, respectively, as best seen in FIG. 1. Connected.

The pump chamber 5 of the injection pump 3 is connected to the pump outlet 22 via two flow paths 20, 21 formed in parallel holes, which are connected to the pipe of the fuel pipe 16. Section 16b is connected. The two flow paths 20, 21 have check valves 23, 24 in opposite directions, one of which is the check valve 23 is open in the forward direction, the other is the check valve 24 is Closing in the forward direction, the opposite situation applies for the opposite direction. The flow paths 20, 21 with check valves 23, 24 are provided here in a block fixed by a nipple comprising a pump outlet 22, which is assembled into the injection pump 3.

The orientation tube 17 has a check valve 25 that opens in the forward direction. The check valve 25 is provided in the connection region of the nipple 19 and the valve housing.                     

The fuel pressure that may be generated by the injection pump 3 is greater than the pressure necessary to lift the nozzle needle 11 out of its seat and is greater than the opening pressure of the associated check valve 23 which opens in the forward direction. The pressure that may be generated by the pump 7 is not greater than the opening pressure of the check valve 25 disposed in the orientation tube 17 and the check valve 24 opening in the counter flow direction, which is arranged in the injection pump 3. However, it is smaller than the opening pressure of the nozzle needle 11. The shut-off valve 8 arranged next to the pump 7 is controlled so that an opening step appears between the two strokes of the injection pump 3.

At the end of the injection process, the flow path from the injection pump 3 to the hole of the injection nozzle 10 is filled with conventional fuel. When the delivery of the injection pump 3 is stopped and the shutoff valve 8 is opened, the check valve 25 which opens in the forward direction, installed in the orientation tube 17, by the pressure generated by the pump 7 is provided. Is opened, and the pressure in the orifice tube 17 also acts on the fuel tube 16 communicating with it, so that the check valve 24 opened in the counterflow direction provided in the injection pump 3 is also opened. This opens the flow path from the pressure source for the emulsion to the pressure source for the conventional fuel.

By the pump 7 an orientation flows into the injection valve 2. At the same time, an amount of conventional fuel corresponding to the amount of introduced emulsion is injected from the injection valve 2 as indicated by the indicator arrows 26a and 26b in FIG. 2. The orifice passes through the check valve 25 and flows through the hole 17a to the ring-shaped tube 15 and back here to the hole 16a of the fuel tube 16, as indicated by black in FIG. In 16a, an emulsion column is connected to a fluid column formed of conventional fuel.                     

Since the emulsion pressure is insufficient to lift the nozzle needle 11 out of the seat as described above, the emulsion does not enter the branch tube 13 and the pressure chamber 12 filled with conventional fuel as described above. Do not. The conventional fuel pushed out of the injection valve 2 by the orientation flowing into the hole 16a is returned to the injection pump 3 through the flow path 21, and the check valve 24 of the flow path 21 is returned. ) Is opened by the pressure of the emulsion. The shut-off valve 8 installed in the orientation tube 7 is preferably at the outlet of the ring-shaped tube 15 and the injection pump 3 with the maximum amount of orientation introduced into the injection valve 2 during the opening phase. Since it corresponds to the capacity of the fuel pipe 16 to which the capacity of 22 is added, the orientation column in the fuel pipe does not completely reach the injection pump 3 so that the orifice is injected through the flow path 21 to the injection pump 3. Is controlled so that it does not flow into. Therefore, it is preferable that the capacity of the fuel pipe 16 is at least equal to the total injection amount, so that the penetration of the emulsion into the injection pump is very surely excluded.

Subsequently, when the delivery stroke of the injection pump 33 starts, the check valve 24 which opens in the counterflow direction is closed, and the check valve 23 which opens in the forward direction is opened. Since the pressure generated by the injection pump 3 is transferred from the fluid column of the conventional fuel and the emulsion, which are connected to each other, to the check valve 25 installed in the emulsion tube, the check valve 25 is closed. Similarly, since the pressure is transmitted from the ring-shaped pipe 15 through the branch pipe 13 branched to the pressure chamber 12, the nozzle needle 11 is lifted from the sheet to start the spraying process. In this case, a flow path is actually generated from the injection pump 3 to the hole 28 of the injection nozzle 10.                     

The flow direction is directed to the hole of the spray nozzle 10, as indicated by the directional arrow 27 in FIG. 3. The orientation, which previously exited through the branching of the branching tube 13 from the ring-shaped tube 15, exits through the branching tube 13, the pressure chamber 12 and the nozzle hole 28, firstly with the branching tube 13 and the pressure. The conventional fuel that was in the chamber 12 is then injected with an emulsion, which is then pushed by the flowing conventional fuel. When the conventional fuel is injected again, that is, when the emulsion is completely pushed out of the branch pipe 13, the pressure chamber 12 and the nozzle hole 28, the injection process is finished.

In this way, three levels of laminar spraying are actually achieved. As shown in FIG. 4, the conventional fuel is injected in the first step 30, the orientation in the intermediate step 31, and the conventional fuel is injected again in the third step 32. The intermediate step 31 for the emulsion is relatively long, as in the embodiment shown in Fig. 4, so that the amount of injected injection occupies a relatively large portion of the total injection amount, so that a relatively large amount of conventional fuel is saved.

According to the present invention, the wear promoting emulsion only contacts the injection valve which is less sensitive to wear particles, and keeps it away from the pressure source for conventional fuels which may be a injection pump which is very sensitive to wear particles. Thus, by limiting contact of the orifice to less sensitive injection valves, wear problems are relatively low, resulting in reduced maintenance costs and a relatively long service life.

Claims (11)

An internal combustion engine, by which the injection system 1 can provide a conventional fuel and an orientation that partially replaces it, the injection system being a fuel pipe branched from a pressure source 3 for conventional fuel which can be activated in a cycle of the internal combustion engine One or more injection valves 2 capable of providing conventional fuel via 16, the injection nozzles 10 of the injection valves being closeable by nozzle needles 11, the nozzle needles being The nozzle pressure can be lifted from the seat against the force of the feedback device by the fuel pressure in the pressure chamber 12 communicating with the fuel pipe 16, through which the conventional pressure source 3 for fuel is directed in the opposite direction. Is connected to the fuel pipe 16 via two parallel flow paths 20, 21 with check valves 23, 24 of the fuel pipe, which is connected to an orientation pipe 17 near the injection nozzle. , The orientation tube is forward Branched from a pressure source 7 for orientation, which is activated by a cycle of an internal combustion engine, the pressure of the pressure source being check valve 25 disposed in an orientation tube 17; An internal combustion engine, which is arranged in a conventional fuel pressure source (3), which is larger than the opening pressure of the check valve (24) opening in the reverse flow direction and smaller than the opening pressure of the nozzle needle (11). The fuel pipe (16) and the orifice pipe (17) are connected to each other via a ring-shaped pipe (15) concentric with the valve needle (11) inside the injection valve (2). Internal combustion engine, characterized in that for branching one or more branch pipes (13) extending from the ring-shaped pipe into the pressure chamber (12). 3. The check valve (25) according to claim 1 or 2, wherein the check valve (25) arranged in the orientation tube (17) comprises a housing of the injection valve (2) and a nipple arranged in the orientation tube (17) mounted to the housing. 19) internal combustion engine, characterized in that arranged in the region between. The side of the valve needle (1) according to claim 1 or 2, wherein the fuel pipe (16) and the emulsion tube (17) are each formed as holes (16a or 17a) in a housing of the injection valve (2). An internal combustion engine comprising a section located at. 3. The shut-off valve 8 according to claim 1, wherein the shut-off valve 8 is arranged after the pressure source 7 for the emulsion, and the shut-off valve 8 is operated by a control device 9 in a cycle of an internal combustion engine. Internal combustion engine which can be characterized in that. 6. Internal combustion engine according to claim 5, characterized in that the shutoff valve (8) is formed as an electromagnetic valve. 6. An internal combustion engine according to claim 5, characterized in that the shutoff valve (8) is controlled to open and close before activation of a conventional fuel pressure source (3) every cycle of the internal combustion engine. The internal combustion engine according to claim 1 or 2, characterized in that the pressure source (7) for the emulsion is formed as a low pressure pump in the form of a rotary pump. The internal combustion engine according to claim 1 or 2, characterized in that in each cycle of the internal combustion engine, the orientation tube (17) can be provided with an amount of orientation corresponding to the capacity of the fuel line (16) at most. Agency. 10. The internal combustion engine according to claim 9, wherein the capacity of the fuel pipe (16) is at least equal to the total injection amount. 3. The fuel source (3) according to claim 1 or 2, wherein the conventional pressure source (3) for fuel is formed as an injection pump, and the pump chamber (5) of the injection pump is provided with check valves (23, 24) in opposite directions. An internal combustion engine, characterized in that it is connected to its outlet (22) via two flow paths (20, 21), to which the fuel pipe (16) is connected.

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