JP2014137066A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely detect excessive fuel leakage in a region of a pressure accumulation system in a high pressure region of a fuel supply device and allocate the fuel leakage to a specific closed portion surely and reliably.SOLUTION: In a fuel supply device of an internal combustion engine, all distribution units (9) of the pressure accumulation system coupled to one another via a high pressure conduits (10) are connected to a common leakage collection conduit (13) having a leakage sensor (14) common to all the distribution unit (9). A visual inspection device (15) individual of each of the distribution units (9) of the pressure accumulation system (7) for detecting a leakage exceeding a limit value for the pressure accumulation system as a single leakage is provided. If there is a leakage detected via the leakage sensor (14), the leakage is allocated to at least one distribution unit (9).

Description

  The present invention relates to a fuel supply device for an internal combustion engine according to claim 1.

  FIG. 1 shows a basic configuration of a common rail fuel supply device of an internal combustion engine known from the prior art, that is, a marine diesel engine operated with heavy oil. This configuration is known from US Pat. That is, the common rail fuel supply device of FIG. 1 includes at least one injector 1 for each cylinder of the internal combustion engine. Fuel can be injected into each cylinder of the internal combustion engine via the injector 1. The common rail fuel supply device further includes a pump device 3 having at least one low pressure pump 5, at least one high pressure pump 2 and a high pressure pumping system 8, whereby fuel is removed from the low pressure region 4 of the common rail fuel supply device. A high pressure region 6 is transported to the high pressure region 6 of the fuel supply apparatus. At this time, the high pressure region 6 is provided with a pressure accumulating system 7 that is constantly placed under high pressure between the pump device 3 and the injector 1. The accumulator system that is constantly placed under high pressure is also called a common rail, and has a plurality of distribution units 9. The distribution unit 9 is connected to the pump device 3 and to each other via a high-pressure conduit 10 that is constantly placed under high pressure. The pressure accumulating system 7, that is, the distribution unit 9, is further connected to the injector 1 via a high-pressure conduit 11 that is intermittently placed under high pressure according to the timing of injection. An open / close valve 12 is disposed in a high-pressure conduit 11 that connects the injector 1 to the distribution unit 9 and that is intermittently placed under a high pressure in accordance with the injection timing. In response to this, fuel is supplied to the injector. For further details, reference should be made to US Pat.

  Such fuel supply devices for internal combustion engines known from the prior art are numerous in the high-pressure region 6, in particular in the region of the accumulator system 7 which includes a distribution unit 9 connected via a high-pressure conduit 10. It has a sealed part. Leakage may occur in the area of these sealed portions. In this case, if the leakage amount is too large, proper operation of the fuel supply device cannot be guaranteed.

  Therefore, an excessive fuel leak in the area of the pressure accumulating system 7 in the high pressure area 6 of the fuel supply device is detected easily and reliably, and the fuel leak is reliably and reliably assigned to a specific sealed location. Is required.

German Patent No. 10157135

  In view of the above problems, an object of the present invention is to create a new fuel supply device for an internal combustion engine.

  The above problem is solved by the fuel supply device for an internal combustion engine according to claim 1.

  According to the invention, all distribution units of the accumulator system connected via high-pressure conduits are connected to a common leak collection conduit having a leak sensor common to all distribution units, thereby The amount of leakage exceeding the limit value for the pressure accumulation system is detected as a single body. At this time, each distribution unit of the pressure accumulating system is provided with a unique visual inspection device, whereby if there is a leak detected via the leak sensor, the leak is assigned to at least one distribution unit.

  In the fuel supply apparatus according to the present invention, all the distribution units of the pressure accumulating system and the high-pressure conduits connecting the distribution units together are coupled to a common leak collection conduit, A common leakage sensor is provided for each of the distribution units. If the overall leak in the pressure accumulator system is greater than the limit value, the leak sensor reacts and detects the amount of leak that exceeds the limit value. Each distribution unit of the pressure accumulator system is then provided with a unique visual inspection device in order to specifically assign a leak above the limit value to a specific sealed location or distribution unit in the pressure accumulator system. When the leak sensor detects a leak that exceeds a limit value for the overall pressure accumulator system, the leak can be assigned to individual distribution units of the pressure accumulator system by the visual inspection device.

  Thus, it is not necessary to provide a separate leak sensor for each dispensing unit. Rather, a common leak sensor for all dispensing units is sufficient. This is because assigning leaks to the dispensing unit is done via a visual inspection device. Such a fuel supply device makes it possible to detect leaks easily and reliably and to assign the detected leaks to individual sealed locations.

  According to a further advantageous configuration, each visual inspection device has in its area a respective dispensing unit a leakage inflow coupled to the leakage collection conduit and a leakage outflow coupled to the leakage collection conduit as well. The leak inflow and leak out are connected to the leak chamber of each visual inspection device, and there is a choke between the locations where the leak inflow and leak out are connected to the leak collection conduit. Is provided. Such a configuration of the visual inspection device is particularly easy and is therefore preferred.

  In the area of the dispensing unit, if the leak is less than the limit value, the leak will flow directly through the choke into the leak collection conduit. In the area of the distribution unit, if the leakage is greater than the limit value, the leakage blocked by the choke reaches the leakage chamber of the individual visual inspection device via the individual leakage inflow. If the leak chambers of the individual visual inspection devices are filled with leaks above the limit value, further incoming leaks will flow out of the leak chambers into the leak collection conduit via the individual leak outs.

  The leak outflow is preferably connected to the leak chamber of the individual visual inspection device above the leak inflow, especially in such a way that the leak chamber is not emptied even when the engine is in an inclined position. Yes. This can ensure that leaks can be reliably and reliably assigned to a sealed location or distribution unit even when the fuel supply is not in operation, and possibly even when the internal combustion engine is in a tilted position.

  Further preferred configurations of the invention are described in the dependent claims and in the following detailed description. An embodiment of the present invention will be described in more detail based on the drawings, but the present invention is not limited to the embodiment. The drawings show the following.

It is a figure which shows schematically the fuel supply apparatus known from a prior art. It is a figure which shows the part of the 1st fuel supply apparatus which concerns on this invention. It is a figure which shows the detail of the fuel supply apparatus which concerns on this invention shown in FIG. It is a figure which shows the part of the 2nd fuel supply apparatus which concerns on this invention.

  The present invention relates to a fuel supply device for an internal combustion engine, particularly a large rail engine or marine diesel engine, and more particularly to a common rail fuel supply device. The basic configuration of such a fuel supply apparatus has already been described with reference to FIG. From this point on, the present invention enables reliable and reliable detection of leaks and the reliable and reliable allocation of such leaks in the high pressure region 6 of the fuel supply device, i.e. the pressure accumulating system 7. To details.

  FIG. 2 shows the fuel supply device according to the invention as a schematic part in the region of the pressure accumulator system 7, ie in the region of the two distribution units 9 of the pressure accumulator system 7 connected via the high-pressure conduit 10. .

  All the distribution units 9 are connected to a common leak collection conduit 13, and the leak collection conduit 13 is provided with a common leak sensor 14 for all the distribution units 9. When a leak larger than a predetermined limit value occurs in the entire system of the pressure accumulating system 7, that is, in any sealed location in the pressure accumulating system 7, the leak is transmitted to the pressure accumulating system 7 through the leak sensor 14 or It can be detected as a single entity.

  The fuel supply device according to the present invention further has a unique visual inspection device 15 in the area of each distribution unit 9 of the pressure accumulating system 7. If the overall leak detected via the leak sensor 14 is greater than a predetermined limit value, the visual inspection device 15 identifies a leaky sealed location in the pressure accumulator system 7 and also for one or more dispensing units 9 Can be specifically assigned.

  Therefore, a single leak sensor 14 is sufficient to detect leaks that are larger than the limit values and that cannot guarantee proper operation of the fuel supply device. The assignment of leaks and the identification of the leaking and sealed locations thereby causing leaks is performed via visual inspection devices 15 that are uniquely arranged in the individual dispensing units 9.

  As can be seen from FIG. 2, the distribution units 9 of the accumulator system 7 shown in the figure are connected to each other via a high-pressure conduit 10, each distribution unit 9 having a high-pressure inlet 16, while having a high-pressure outlet 17. Have. Via the high-pressure inlet 16 and the high-pressure outlet 17, the distribution unit 9 and the visual inspection device 15 of the distribution unit 9 can be connected to the high-pressure conduit 10, or the distribution unit 9 can accumulate pressure via the high-pressure conduit 10. It can be coupled to the system 7.

  Extending between the individual high-pressure inlets 16 and the individual high-pressure outlets 17 of the individual distribution units 9 are high-pressure conduit sections 18 formed through holes in the individual distribution units 9. The fuel flows through the individual distribution units 9 from the high-pressure inlet 16 to the high-pressure outlet 17 via the holes or via the high-pressure conduit part 18. Starting from the hole or the high-pressure conduit section 18, fuel can be discharged from the individual distribution units 9 toward the individual injectors 1.

  As can be seen from FIG. 2, each visual inspection device 15 is connected in the region of the individual dispensing unit 9 to the leak collection conduit 13 on the one hand via the leak inflow 19 and on the other hand via the leak outflow 20. . Both the leakage inflow part 19 and the leakage outflow part 20 act on the leakage chambers 21 of the individual visual inspection devices 15 in the area of the individual distribution units 9.

  Leakage via the leak inlet 19 is from the sealed location to be monitored, in the embodiment shown in the figure, from the high pressure inlet 16 to be monitored of each distribution unit 9 to the leak chamber 21 of each visual inspection device 15. Leakage can be directed toward the leak collection conduit 13 from the leak chamber 21 of the individual visual inspection device 15.

  According to FIG. 2, the individual visual inspection device 15 of each distribution unit 9 further includes a choke 22, where the choke 22 is connected to the leak collecting conduit 13. Connected between.

  If the leak is smaller than the limit value in the region of the distribution unit 9, the leak can be discharged directly into the leak collection conduit 13 via the individual choke 21.

  On the other hand, if the leakage is greater than the limit value in the area of the individual distribution unit 9, the leakage is blocked before the choke 22 and then individually through the leakage inflow 19 for each individual visual inspection device 15. It reaches the area of the leakage chamber 21.

  If an individual dispensing unit 9 or an individual leakage chamber 21 in the individual visual inspection device 15 is filled with a leak and further leaks continue to flow through the leak inlet 19, the leak will be an individual leak outlet. From the individual leak chambers 21 of the individual visual inspection devices 15 via 20 can flow into the leak collection conduit 13, thereby avoiding the leak chamber 21 being overfilled with leaks.

  Therefore, as already mentioned, when there is a leak in the accumulator system 7 that is greater than the limit value and cannot guarantee proper operation of the fuel supply device, the leak is itself arranged in the leak collection conduit 13. The common leakage sensor 14 is used to detect the pressure accumulation system 7 as a single body. However, in spite of using a common leak sensor 14, each dispensing unit 9 has a visual inspection device 15 so that the leak can be assigned to a specific sealed location or a specific dispensing unit 9. The visual inspection device 15 is connected to the high-pressure inlet 16 of each distribution unit 9 in the embodiment shown in the figure. Each visual inspection device 15 includes a leak chamber 21, which is coupled to the leak collection conduit 13 via a leak inflow 19 and a leak outflow 20, which is the leak inflow The choke 22 is connected between 19 and the leak collecting conduit 13. If a leak greater than the limit value is formed in the area of the distribution unit 19, the leak will not be exhausted completely via the choke 22 into the leak collection conduit 13 common to all distribution units 19, Rather, in this case, the leakage stays in front of the choke 22 and then reaches the leakage chamber 21 of each visual inspection device 15 via the leakage inflow portion 19. The air in the leak chamber 21 is discharged from the leak chamber 21 toward the leak collection conduit 13 via the leak outflow portion 20. If further leaks are conveyed to the individual leak chambers 21 via the leak inlet 19, after a certain filling level in the leak chamber 21, further leaks from the leak chamber 21 via the leak outlet 20 It is discharged toward.

  As can be seen from FIG. 3, the leak outflow 20 is coupled to the leak chamber 21 of the individual visual inspection device 15 above the leak inflow 19, thereby being larger than the limit value in the area of the individual dispensing unit 9. When there is a leak, it is first possible to fill the individual leak chambers 21 and subsequently discharge further subsequent leaks towards the leak collection conduit 13 after the leak chamber 21 has achieved a certain fill level.

  If leaks are collected in the area of the visual inspection device 15, i.e. in the area of the leakage chamber 21 of such a visual inspection device, the leakage can be visually recognized via the gauge glass 23.

  If the recognized leak is greater than the limit value and the result is that the fuel supply device is shut off, the leak chamber 21 of the visual inspection device 15 of the dispensing unit 9 has an unacceptably large leak, In order to avoid the leak out completely, the leak inflow 19 acts on the individual leak chambers 21 so that it is impossible for the leak to be completely discharged via the leak inflow 19. This is also true when the internal combustion engine and the fuel supply device with it are in a tilted position. That is, FIG. 3 is a partial view showing the region of the distribution unit 9 at the position where the fuel supply device is attached, and the one-dot chain line 24 implies the leakage filling level in the leakage chamber 21 of each visual inspection device 15.

  At least one of the leaks if the fuel supply is shut down and therefore no further leaks subsequently flow into the leak chamber 21 and if the internal combustion engine subsequently fails to take the relative position shown in FIG. It is guaranteed that the part remains in the leak chamber 21 and can be recognized from the outside through the gauge glass 23.

  In order to completely empty the leak chamber 21 of each visual inspection device 15 after repair or repair of the non-sealed part of the fuel supply device, in the embodiment shown in FIGS. Can be removed by loosening the screw, so that the amount of leakage still in the leakage chamber 21 can be removed from the leakage chamber.

  Unlike the above, FIG. 4 shows an embodiment in which an additional valve 25 is provided, after the repair of the unsealed part, the remaining leakage from the leakage chamber 21 via the additional valve. Can be discharged. In this case, it is not necessary to remove the gauge glass 23. Rather, by operating the valve 25 with the gauge glass 23 attached, the individual leakage chambers 21 of the individual visual inspection devices 15 can be completely emptied. Can be guaranteed.

DESCRIPTION OF SYMBOLS 1 Injector, 2 High pressure pump, 3 Pump apparatus, 4 Low pressure area, 5 Low pressure pump, 6 High pressure area, 7 Accumulation system, 8 High pressure pumping system, 9 Distribution unit, 10 High pressure pipe, 11 High pressure pipe, 12 On-off valve, 13 Leakage Collection conduit, 14 Leak sensor, 15 Visual inspection device, 16 High pressure inlet, 17 High pressure outlet, 18 High pressure conduit, 19 Leakage inlet, 20 Leakage outlet, 21 Leak chamber, 22 Choke, 23 Gauge glass, 24 Leak Filling level, 25 valves

Claims (6)

Especially a fuel supply device for an internal combustion engine formed as a large diesel engine or a marine diesel engine, in particular a common rail fuel supply device,
A low pressure region (4) and a pump device (3), thereby transporting fuel from the low pressure region of the fuel supply device to the high pressure region (6) of the fuel supply device; Between the pump device (3) and the injector (1) disposed in the cylinder, there is provided a pressure accumulating system (7) that is constantly placed under high pressure. 10) having a distribution unit (9) connected via
The pressure accumulating system (7) is connected to the pump device (3) via at least one high-pressure conduit which is also constantly under high pressure,
In the fuel supply device, the pressure accumulating system (7) is connected to the injector (1) through a high-pressure conduit (11) that is intermittently placed under high pressure according to the timing of injection.
All distribution units (9) of the accumulator system connected via the high pressure conduit (10) have a common leak collection conduit with a leak sensor (14) common to all distribution units (9). (13), thereby detecting the leakage amount exceeding the limit value with respect to the pressure accumulation system as a single body, and each distribution unit (9) of the pressure accumulation system (7) has its own visual inspection device. (15) is arranged so that when there is a leak detected via the leak sensor (14), the leak is assigned to at least one distribution unit (9). . Each visual inspection device (15) is connected to a leakage inlet (19) coupled to the leakage collection conduit (13) in the area of the respective dispensing unit (9), as well as to the leakage collection conduit (13). A combined leak outflow (20),
A choke (22) is provided between locations where the leakage inflow part (19) and the leakage outflow part (20) are coupled to the leakage collection conduit (13). Item 4. The fuel supply device according to Item 1.   In the area of the distribution unit (9), if the leak is less than the limit value, the leak will flow directly to the leak collection conduit (13) via the choke (22) and the area of the distribution unit (9). If the leakage is larger than the limit value, the leakage blocked by the choke (22) passes through the leakage inflow portion (19) of each individual leakage chamber (21) of the individual visual inspection device (15). ) And the leakage chamber (21) of each of the visual inspection devices (15) is filled with leakage above a limit value, further leakage will enter the individual leakage outlet (20). The fuel supply device according to claim 2, wherein the fuel supply device flows out from the leakage chamber (21) to the leakage collecting conduit (13).   4. The leak outflow part (20) is connected to the leak chamber (21) of each of the visual inspection devices (15) above the leak inflow part (19). Fuel supply device.   The leakage outflow part (20) and the leakage inflow part (19) are coupled to the leakage chamber (21) of each of the visual inspection devices (15), and the coupling is performed even when the engine is in an inclined position. The fuel supply device according to claim 3 or 4, characterized in that the leakage chamber (21) is not emptied.   6. The leakage chamber (21) of the visual inspection device (15) of each distribution unit (9) can be emptied via a valve (25), according to any one of claims 3-5. Fuel supply device.

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