JP3854899B2 - Device for fuel supply of internal combustion engines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an injection valve provided for a cylinder, in particular, a plurality of injection valves for each cylinder, and each injection valve can be connected to a pressure conduit that can be supplied with fuel by a pressure source. Having at least one flow path leading to the injection hole forming part, the flow path penetrating at least one closing body, which can be pressed against the seat under the action of a spring And a device for fuel supply of an internal combustion engine, in particular a two-cycle large diesel engine, which can be lifted from this corresponding seat by fuel at a certain fuel pressure About.
[0002]
[Prior art]
A device of this kind is known from EP 0744007 by the applicant. In the case of the conventional configuration, the operation of the injection valve cannot be stopped individually. For this reason, all the injection valves are operated even at the time of partial load. Therefore, when the load becomes relatively small, the injection pressure becomes lower and the accompanying fuel spray failure and combustion failure are caused. This not only results in unstable operation, but also results in undesired accumulation of combustion residues that can result in accelerated wear. Therefore, it has become clear that the conventional configuration is not sufficiently reliable.
[0003]
[Problems to be solved by the invention]
For these reasons, the object of the present invention is to improve the device as described above easily and without cost, and selectively stop at least some of the plurality of existing injection valves. Is to be able to.
[0004]
[Means for Solving the Problems]
According to the present invention, at least one closing body of at least a part of a plurality of existing injection valves, which are penetrated by a flow path, is attached to a corresponding seating portion by a control piston. The force exerted on the closing body from the control piston to hold the injection valve in the permanently closed position is greater than the force exerted on the closing body by the fuel pressure during partial load operation, and is the highest This is solved by less than the force exerted on the closure by the limiting fuel pressure.
[0005]
At this time, preferably, by applying pressure to the control piston, it becomes possible to hold the closing body in the apparatus on the corresponding seating portion, and accordingly, flow is performed so that injection does not occur. The flow in the road can be cut off. Therefore, it is possible to successfully stop some of the plurality of injection valves at the time of partial load, and thereby, in the remaining injection valves, a relatively high injection pressure and a good fuel atomization associated therewith can be achieved. This is achieved, which results in good combustion and unwanted deposition control. With the solution according to the invention, the disadvantages of the known arrangements detailed above can be completely avoided. The pressure exerted on the closing body from the control piston is made smaller than the force exerted on the closing body by the maximum limiting fuel pressure, and at the same time the pressure rise beyond the allowable range in the fuel system As a result, it is reliably avoided that some components are mechanically damaged, which has a positive effect on the safety of the operation. As long as the action by the pressure means (pressure medium) is not applied to the control piston, the injection valve according to the present invention operates like a conventional injection valve. As a result, there is no danger of explosion even when the action imparting device or the supply device (Beaufschlagungseinrichtung) provided for the control piston is stopped. Thus, the solution according to the invention guarantees high reliability and safety. A further advantage is that the device according to the invention can also be used to change the opening pressure of the closure. Therefore, the configuration of the solution means according to the present invention also has many excellent multi-facets.
[0006]
Preferred embodiments as well as preferred developments of the superordinate solution are given in the subclaims. Thus, it is sufficient that the control piston can be provided with an action using a pressure means (pressure medium) by hydraulic pressure, and the application of this action is preferably performed according to the load. It can be started and stopped using a valve that can be controlled by a control device. This solution provides a simple configuration and high functional reliability. At the same time, preferably the idle time is very short. In the case of a diesel engine, diesel oil can be suitably used as a pressure means by hydraulic pressure. Thereby, even if the pressure liquid leaks and mixes with the fuel, no harm is caused.
[0007]
Further preferred solutions can be as follows. That is, at least one group of control pistons is provided with a common supply loop, which is connected to a pressure source and in particular an adjustable safety valve. From this supply loop, a plurality of stub conduits are branched and led to the corresponding control piston. Each of these stub conduits is provided with one valve that can be controlled using the control device. This solution makes the pressure source preparation device or pressure medium preparation device (Druckmittel-Bereitstellungseinrichtung) provided for all control pistons in cooperation with the pressure source and the safety valve for limiting the pressure particularly simple. Since it will be formed at a low cost, even a configuration that saves space is obtained.
[0008]
Preferably, the spring disposed in the closing body can be supported on the control piston side. At this time, the biasing force of the spring is changed by applying pressure to the control piston. Thus, with the solution according to the invention, it is not only easily possible to keep the closure completely in its closed position. On the contrary, the initial pressure of the spring and thus even the opening pressure of the closure can be changed. Such a configuration is mainly important for the closing body adjacent to the injection hole forming portion on the outlet side.
[0009]
The control piston disposed with respect to the first closing body disposed at the inlet portion of the injection valve has a guide pin that protrudes from the shoulder of the fixed support member and penetrates the flow path. Alternatively, the guide pin is engaged in the closed body so as to provide a degree of freedom of displacement in the axial direction. This solution ensures that the closure and the corresponding control piston are guided axially. At the same time, this results in a very well-closed closure-control piston configuration that can be used in place of a conventional closure, which easily enhances the performance of the conventional arrangement and improves performance. It is possible to improve.
[0010]
A further preferable solution may have the following configuration. That is, at this time, the guide pin is provided with a radial circulation hole that opens when a load is removed from the control piston, and the circulation hole communicates with the reflux conduit. This circulation hole allows the air in the fuel system to be vented and allows the fuel in the internal combustion engine that is stopped but maintained in a standby state to circulate, which is particularly warming such as heavy oil. It is particularly advantageous to eliminate thermal shock and / or conduit clogging when using selected fuels.
[0011]
Preferably, the said control apparatus may be comprised so that a pressure can be alternately provided to the control piston of the injection valve provided for every cylinder with a predetermined cycle. As a result, during partial load operation, the injection valves respectively provided in the cylinders can be alternately started or stopped. Countermeasures can be taken by alternately repeating the operation and the stop in this way against the influence of the impact at the start of the re-operation that occurs when the individual injection valves are considerably cooled. The same can be said for coking of the injection hole. Thus, the operational reliability is improved by the above-described solving means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Further preferred embodiments and preferred developments of the upper claims are given in the remaining subclaims and can be understood in more detail from the examples described below with reference to the drawings. .
[0013]
The internal combustion engine 1 shown in FIG. 1 can be, for example, a two-cycle large-sized diesel engine used as a drive unit of a ship, and has a plurality of cylinders 2, and only one of them is shown in FIG. Has been. Each cylinder 2 is provided with two injection valves 3, and a common injection pump 4 is provided for each of these injection valves. A supply loop having a supply line branch pipe 5a and a reflux branch pipe 5b is provided for the injection pumps 4 (also referred to as fuel pumps) of all cylinders 2, and a tank 6 and a preparation pump 7 are provided in the supply loop. A pressure adjusting valve 8 is provided. In the present embodiment, the inside of the supply line branch pipe 5a of the supply loop 5 provided on the upstream side of the pressure adjustment valve 8 has a pressure of 8 atm, and is provided on the downstream side of the pressure adjustment valve 8. The inside of the reflux branch pipe 5b has a pressure of 4 atm. The fuel pump 4 is connected to the supply line branch pipe 5a of the supply loop on the suction side and to the reflux branch pipe 5b of the supply loop on the return side. The injection valve 3 is connected to the fuel outlet of the corresponding fuel pump 4 on the inlet side via a pressure conduit 9 and on the reflux side to the reflux branch pipe 5b of the supply loop 5 via a reflux conduit 10. ing.
[0014]
The injection valve 3 can be fixed to each cylinder head of the cylinder 2 provided. In order to fix in this way, the injection valve 3 is provided with a flange 11 on the upper end side as can be seen from FIG. This flange is provided on one side with a protruding screw part 12 for connection to the pressure conduit 9 arranged. On the opposite side, a threaded collar 13 is provided on the flange 11, and an outer nozzle tube 15 (also simply referred to as a nozzle tube or a jacket tube) can be fixed to the threaded collar via a cap nut 14. It has become. This nozzle tube 15 supports a nozzle body 16 projecting downward in which an injection hole 17 is provided, and this injection hole 17 is connected to the projecting screw portion 12 side through a flow passage generally indicated by reference numeral 18. It is connected to a pressure conduit 9 that can be connected with a free passage.
[0015]
In the members arranged in order from the protruding screw portion 12 to the nozzle body 16 in the flowing direction, a recess suitable for forming the flow path 18 is formed.
[0016]
Correspondingly, the flow path 18 penetrates through the flange 11 with both the projecting screw part 12 and continues to the control valve component part, which is arranged inside the jacket tube 15 and is generally indicated by the reference numeral 19, and subsequently the intermediate part. The member 20 and then the closing device provided upstream of the nozzle body 16 and indicated in its entirety by the reference numeral 21 and finally to the central hole of the nozzle body 16 from which the injection hole 17 is connected. Divided.
[0017]
In the embodiment shown in FIG. 2, with respect to the valve spring 24 formed as a coil spring and disposed in the closing device 21, an immovable upper spring plate 22 and a movable lower spring plate 23 include the intermediate member. 20 is provided. The closing device 21 has a closing body 25 supported by a movable spring tray 23 provided with a projecting support portion, and this closing body 25 is the center of a seating member 26 accommodated in the jacket tube 15. The nozzle body 16 is connected to the seating member 26. The closing body 25 includes a front pin 27 that is tapered compared to the guide surface of the closing body itself, and a conical sealing surface that can be placed on the seating surface 28 of the seating member 26. Is provided. The pin 27 supports a front protruding portion in which a groove is formed along the axial direction. The front projecting portion is inserted into the portion of the seating member 26 mounted on the nozzle body 16 and protrudes into the central hole of the nozzle body 16. The seating member 26 is supported on the nozzle portion 16 side, and on the other hand, is supported on the extension member 29 side connected to the intermediate member 20. The extension member 29 includes a pin that engages with a blind hole 30 of the axial closing body 25, which is a part of the flow path 18, with a degree of freedom of displacement in the axial direction. It is partially surrounded by the part.
[0018]
The pin 27 of the closure 25 which can be engaged with the seating surface 28 is surrounded by a ring-shaped cavity 31 which is connected to the central blind hole 30 via an inclined hole 32 because of its small diameter. . As soon as fuel is accumulated in the ring-shaped cavity 31 with sufficient pressure, the closing body 25 is lifted against the action of the valve spring 24, and as a result, the sealing surface of the closing body 25 faces. By being removed from the seating surface 28, the flow path from the ring-shaped cavity 31 to the injection hole 17 is released, and injection is performed.
[0019]
The control valve component 19 has a configuration similar to the closing device 21 described above. As can best be seen from FIG. 3, the control valve component 19 also has a closure 35, which is guided in a central hole in the corresponding seating member 36 and has a front pin. 37, and the pin 37 has a conical sealing surface that goes around. The sealing surface is provided on a seating surface 38 that surrounds the lower discharge hole of the seating member 36 that is provided for the sealing surface. It can be brought to place. As can be seen from FIG. 2, the seating member 36 is supported on the intermediate member 20 side by the lower end portion thereof, and is placed on the support member 39 by the upper end portion of the collar portion 40 behind. As shown in FIG. 2, the support member 39 is inserted into a recess of the flange 11 provided correspondingly. The support member 39 is provided with a guide pin 41 projecting downward, and this guide pin 41 is axially inserted into a blind hole 42 at the center of the closing body 35 which is a part of the flow path 18. Are engaged with a degree of freedom of displacement. On the closed body 35 side, a lower end portion of a spring 45 formed as a compression spring is supported. The blind hole 42 is connected via an inclined hole 43 to a ring-shaped cavity 44 that surrounds the pin 37. Thus, again, the fuel that accumulates in the ring-shaped cavity 44 under pressure makes it possible to lift the closure 35 against the action of the spring 45 arranged in the closure 35.
[0020]
The spring 45 is supported on the closing body 35 side, and on the other hand, is supported on the control piston 46 side provided with respect to the closing body 35. Here, since the control piston 46 is penetrated by the pin 41 of the support member 39 and surrounded by the flange portion 40 of the seating member 36, it is guided accurately. Since the spring 45 is weaker than the valve spring 24, the closure 35 is already removed from the facing seat 38 at a relatively low fuel pressure, so that fuel accumulates in the part of the closure device 21. .
[0021]
In the closed position shown in FIG. 3, the seal body 35 (closed body) is supported by the seating surface 38 of the facing seating member 36 by its sealing surface, and the control piston 46 is opposed by the rear piston surface. It is supported on the shoulder surface of the support member 39 that surrounds the pin 41. At this time, the seal body 35 and the control piston 46 are separated from each other, and a gap 47 is generated in the region of the end face located facing each other. The pin 41 of the support member 39 is provided with a radial hole 48 (circulation hole) that is a part of the flow path 18 and is separated from the middle hole of the support member 39 and has a relatively small diameter. . The radial hole 48 reaches a gap 47, and this gap 47 is formed by a concave portion on the outer peripheral surface side of the closing body 35 and a concave portion on the outer peripheral surface side of the control piston 46, and Provided to the ring-shaped cavity of the opening 49 of the seating member 36 surrounded by the flange 40. The opening 49 is connected to the inner space 51 of the jacket tube 15 through a lateral hole 50, and the inner space 51 is connected to the reflux conduit 10 disposed through the opening mechanism 52 shown in FIG. 2. It is connected. The radial hole 48 is thus in communication with the arranged reflux conduit. In the raised control piston, that is, the control piston 46 in the position shown in FIG. 3, the circulation hole 48 allows the fuel to circulate. As a result, air can be removed from the fuel system, and undesired cooling can be avoided during standby operation.
[0022]
By using the control piston 46, the disposed closing body 35 can be pressed toward the seating surface 38 against the action of the fuel accumulated in the ring-shaped cavity 44. Accordingly, it can be held in the closed position. In this way, the injection valve 3 can be stopped.
[0023]
For this purpose, the control piston 46 is supplied with a pressure medium (pressure means) in the area of its piston face on the opposite side of the corresponding closing body 35 on the rear side, so that the action of the pressure means is effected. It can be granted. At this time, a working chamber defined by the piston surface, the shoulder surface of the opposing support member 39, the pin 41 of the support member 39, and the flange 40 of the seating member 36 is formed. As the pressure medium, it is preferable to use a pressure medium based on hydraulic pressure, which is less compressed than a pressure medium based on atmospheric pressure. In the case of a diesel engine, diesel oil can be used well as a pressure medium, so that leaked liquid that sometimes comes out from the working chamber can be taken in without problems by the circulating fuel. .
[0024]
The pressure medium is prepared by a preparation device shown in FIG. This apparatus has a supply loop including a supply line 54a (supply line branch pipe) and a reflux section 54b (reflux branch pipe), and the tank 55 and the preparation pump 56 are adjustable with respect to the supply loop. A pressure valve 57 is provided. The number of stub conduits 58 provided for the number of injection valves 3 per cylinder 2 are drawn from the supply loop described above, and these stub conduits are led to the pressure medium inlet of each injection valve 3 in each cylinder 2 respectively. It is. For this reason, the stub conduit 58 is branched into a number of branch pipes corresponding to the number of cylinders, as indicated by a dotted line in FIG. In the stub conduit 58, controllable shut-off valves 59 are provided on the upstream side of the branch portion. Here, the shut-off valve is an electromagnetic slip valve. The shutoff valve 59 can be controlled by a control device 60 equipped with a computer, as indicated by a signal conductor 61.
[0025]
The amount of pressure that can be generated by the pump 56 is such that when the force is exerted on the closed body 35 provided by the control piston 46 to which this pressure is applied, this force is applied from the spring 45 during normal injection operation. It is sized to be greater than the force exerted on the closure 35 and therefore greater than the force exerted on the closure 35 from the fuel at normal opening pressure. The upper limit of the force exerted on the closing body 35 is preset by a pressure valve 57 that is a safety valve. At this time, it is set so that mechanical damage to the constituent members cannot occur due to excessive fuel pressure. That is, if mechanical damage is likely to occur in the weakest component member, the closing body 35 is removed from the seating portion 38 facing the mechanical member before the mechanical damage is caused, so that the load on the fuel system upstream of the seating portion 38 is removed. To be removed.
[0026]
In the control piston 46 under load and holding the closure 35 in a low position, the circulation hole 48 is capped by the control piston 46 so that no fuel circulation occurs. This achieves a desired high injection pressure in the operating injection valve.
[0027]
By applying a pressure suitable for the control piston 46 of the injection valve 3, the injection valve can be selectively stopped. Thus, when the load applied to the engine 1 is low, one of the two injection valves 3 of each cylinder 2 can be stopped. This results in a precise distribution of fuel even when less fuel is needed, and in addition to ensuring high injection pressures and thus good fuel spraying and associated good combustion. . Accordingly, the valve 59 is appropriately controlled by the computer of the control device 60, so that if it is below a certain partial load, only one injection valve 3 is put in operation for each cylinder 2 and the remaining injections are made. Valve 3 is placed in a stopped state. Correspondingly, the computer of the control device 60 is provided with an input unit 62 suitable for a signal corresponding to the load. Even in the case of the partial load operation as described above, the injection valve 3 of each cylinder 2 has a cycle of about 2 minutes in order to keep the heat load as uniform as possible and to eliminate the coking of the injection holes 17. The operation or stop is repeated alternately. For this reason, the computer of the control device 60 is appropriately equipped with a filed program (abgelegte Programm).
[0028]
The supply of the pressure medium necessary for the operation of the control piston 46 is performed via the flange 11 of the injection valve 3 as can be seen from FIG. For this operation, as is apparent from FIG. 5, the flange 11 is provided with a radial opening 63 so that the stub conduit 58 can be connected to the opening 63. In the illustrated embodiment, two radial openings 63 arranged in pairs are provided. One of these openings 63 can be plugged. The paired configuration of radial openings 63 facilitates guiding the conduit. These radial openings 63 reach a groove 64 provided on the support 39 at the opening portion of the flange 11. As is apparent from FIGS. 2 and 3, the groove 64 communicates with the support member side opening mechanism 65 that reaches the working chamber provided for the control piston 46. The flange 11 is further provided with a connection opening 66 provided for the reflux conduit 10, and this connection opening 66 communicates with the support member side opening mechanism 52 for fuel return described above. ing.
[0029]
In the embodiment described above, the control piston 46 is disposed in each of the upper closing bodies 35 of the injection valve 3. However, in addition to or instead of such a configuration, as is apparent from FIG. 6, the lower closing body 25 is also provided against the action of fuel pressure. A control piston suitable for selectively holding in a low position may be provided. The basic structure of the configuration according to FIG. 6 is the same as the structure of the embodiment shown in FIG. Therefore, hereinafter, only the difference between them will be described first, and at this time, the same reference numerals as those described above will be used for the corresponding members.
[0030]
In the embodiment shown in FIG. 6, a control piston 70 is disposed on the closing body 25 of the closing device 21 provided on the upstream side of the nozzle body 16. In the configuration of this embodiment, the upper closing body 35 is not provided with a control piston. Here, the closing spring provided for the upper closing body 35 abuts on the corresponding shoulder of the support 39 (supporting member), and this support 39 is surrounded by the shoulder. 35 is provided with a projecting portion that engages with 35, and a circulation hole can be provided in the projecting portion.
[0031]
In the present embodiment, the control piston 70 provided for the lower closing body 25 is formed as an upper support portion of the valve spring 24 disposed in the closing body 25. At this time, in the present embodiment, the valve spring is preferably configured as a highly inclined disc spring having spring characteristics. A seating body 36 (sitting member) provided for the upper closing body 35 is provided with a concentric protrusion 72 surrounded by a shoulder 71. The lower end of the protrusion is a closing body. The extension member 29 is provided with a guide pin that engages with the hole 35, and this extension member abuts against a seating member 26 disposed on the closing body 25 by an upper flange on its own side. Yes.
[0032]
The control piston 70 has a flange 73 that overlaps with the upper end of the valve spring 24 and can be supported by the shoulder 71 of the upper seating member 36 located on the opposite side. The flange 73 is connected to the rear flange 74 that engages with the peripheral recess of the upper seating member 36, and is further penetrated by the protrusion 72 of the upper seating member 36 from the flange 73. 75 protrudes downward. A valve spring 24 is guided to be accommodated on the connection adapter, and the lower end of the connection adapter is engaged with a lower movable spring plate 23 as a guide connection adapter. The spring dish is in contact with the closing body 25 side by the protrusion. The flange 73 of the control piston 70 then effectively forms the upper spring dish provided for the valve spring 24, which is here contrasted with the embodiment shown in FIG. Therefore, it is also movable in the axial direction.
[0033]
In order to operate the control piston 70, the control piston can supply a pressure medium to a rear portion of the flange 73. For this purpose, the upper seating member 36 is provided in the support member 39 while penetrating from the rear end surface in contact with the support member 39 side to the shoulder portion 71 provided for the flange 73. A supply hole 76 connected to the opening mechanism 65 is provided. Through this supply hole 76, the pressure medium can be supplied to the surface of the flange 73 that functions as the piston surface of the control piston 70 and is located on the opposite side of the shoulder 71. When the appropriate supply is made, the above-described piston surface of the flange 73 and the working chamber defined by the shoulder 71, the flange 74 and the pipe connection adapter 75 are formed.
[0034]
In a simple case where the pressure medium preparation device (pressure means preparation device) provided for supplying the control piston 70 causes a problem that the lower closing device 21 is occasionally stopped, there is a problem in FIG. The configuration as shown in FIG. However, in a preferred embodiment, in addition to the configuration described above, the pressure medium preparation device relates to the opening pressure of the lower closure body 25 in order to allow the lower closure device 21 to be stopped, i.e. the closure body 25. It is possible to configure such that the possibility of variable adjustment regarding the pressure at the time of removal from the seating portion can be set even during normal operation. A configuration of a pressure medium preparation device suitable for this purpose is shown in FIG.
[0035]
The basic structure of the configuration shown in FIG. 7 corresponds to the structure of the configuration shown in FIG. Therefore, hereinafter, only the difference will be described, and the same reference numerals will be used for members corresponding to the outside.
[0036]
FIG. 7 shows an embodiment in which three injection valves 3 are arranged in each cylinder 2, and these injection valves are provided in a supply line that can be controlled by a control device 60. By operating the shutoff valve 59, it can be operated or stopped. Up to this point, the configuration is the same as that shown in FIG. In the case of the configuration shown in FIG. 7, in addition to this, a control mechanism 77 (pressure maintaining mechanism) is provided in the portion of the supply loops 54a and 54b from which the stub conduit 58 provided in the injection valve extends. Is provided. This control mechanism 77 can set a desired pressure in the supply loops 54a and 54b. The control mechanism 77 can be formed as a controllable throttle valve, and can be suitably provided in the reflux branch pipes of the supply loops 54a and 54b.
[0037]
The control mechanism 77 can also be controlled by the control device 60 as indicated by the signal conductor 78. The computer of the control device 60 can control the shut-off valve 59 so that the stub conduit 58 is open during normal injection operation, i.e. at the stage where all three injection valves 3 operate. Moreover, the control mechanism 77 is controlled so that a desired pressure lower than the pressure required to hold the closing body 25 in the permanent closed position exists in the supply loops 54a and 54b. In this way, the closure body 25 is only seated correspondingly when the force generated on the closure body 25 by the fuel pressure exceeds the force exerted on the closure body 25 from the pressure medium supplied to the control piston 70. Can be removed from the department.
[0038]
In order to be able to adjust the opening pressure of the upper closing body 35, it is of course possible to provide the pressure medium preparation device shown in FIG. 7 in correspondence with the configuration shown in FIG.
[Brief description of the drawings]
FIG. 1 is a schematic view of an internal combustion engine having a fuel supply system disposed therein.
FIG. 2 is a longitudinal sectional view showing a first embodiment of an injection valve according to the present invention.
FIG. 3 is an enlarged view showing a control valve constituent part of the injection valve of FIG. 2;
FIG. 4 is a diagram schematically showing a pressure medium supply device and a control device provided for control valve components of all injection valves.
5 is a horizontal sectional view across the connection flange of the injection valve of FIG. 2;
FIG. 6 is a longitudinal sectional view showing a second embodiment of the injection valve according to the present invention.
7 is a diagram showing a modification to the configuration of FIG.
[Explanation of symbols]
2 ... Cylinder
3 ... Injection valve
9 ... Pressure conduit
10 ... Reflux conduit
18 ... Flow path
24, 45 ... Spring
25, 35 ... Closure
28, 38 ... Seating part
36. Seating member
39 ... Support member
40 ... Buttocks
41 ... Guide pins
46, 70 ... Control piston
48 ... circulation hole
54 ... Supply loop
59 ... Valve
60 ... Control device
62... Signal input unit according to load
77 ... Control mechanism (pressure maintenance mechanism)

Claims (15)

An injection valve (3) is provided for the cylinder (2), and each said injection valve (3) is connectable to a pressure conduit (9) that can be supplied with fuel by a pressure source. Having at least one channel (18) leading to the forming part, said channel passing through at least one closure (25, 35), which is subject to the force of the spring (24, 45). It is possible to urge the seats (28, 38) by working, and they can be lifted from the corresponding seats (28, 38) by the fuel when a certain fuel pressure is reached. An apparatus for the fuel supply of the two-stroke large diesel engine that is configured to,
Is penetrated by the channel (18), at least one of the closure of at least one of said injection valve (3) (25, 35) is, in the seat corresponding to each (28, 38), arranged The control body (25, 35) can be biased by the control piston (46, 70), and can be moved from the control piston (46, 70) to the closure body (25, 35) to hold the injection valve (3) in a normally closed position. The force exerted on the closure body (25, 35) is greater than the force exerted on the closure body (25, 35) by the fuel pressure during partial load operation, and the force exerted on the closure body (25, 35) by the maximum limit fuel pressure. Smaller,
The control piston (46, 70) can be given an action mainly by using pressure means by hydraulic pressure, and the giving of this action is controlled by the control device (60) according to the load. It can be started and stopped using a valve (59) that can
The control piston (46, 70) in the diesel engine is capable of supplying diesel oil as a pressure means, and an apparatus for supplying fuel. The apparatus of claim 1 .
A common supply loop (54) connected to the pressure source and in particular configured with an adjustable safety valve (57) is arranged in at least one of the groups of said control pistons (46, 70). A plurality of stub conduits (58) branching from the supply loop to the corresponding control pistons (46, 70) are branched, and in these stub conduits, a signal input (62) according to the load is provided. The valve (59) which can be controlled by the said control apparatus (60) provided with 1) is provided one each. The apparatus of claim 1 or claim 2 ,
The device (60) for controlling the valve (59) comprises a programmable computer. The apparatus according to any one of claims 1 to 3 ,
The pressure means preparatory device disposed on the control piston (70) is configured to variably adjust the opening pressure of the corresponding closing body (25). The apparatus according to claim 4 .
In the case of an injection valve that includes a plurality of closing bodies (25, 35) that are penetrated by the flow path (18) and are arranged back and forth, the opening pressure of the closing body (25) on the outlet side is variable. A device configured to be adjustable. 6. An apparatus according to claim 4 or claim 5 ,
In the supply loop (54), a pressure maintaining mechanism (77) that can be adjusted using the control device (60) is provided. The apparatus according to any one of claims 1 to 6 ,
The springs (24, 45) arranged on the closing body (25, 35) and formed as compression springs are on the side of the control piston (46, 70) provided with respect to the closing body (25, 35). A device characterized by being supported by. The apparatus according to any one of claims 1 to 7 ,
The control piston (46) disposed with respect to the first closing body (35) disposed at the inlet portion of the injection valve has a guide pin protruding from the shoulder of the fixed support member (39). (41) penetrated and the guide pin is engaged in said closure (35) with a degree of freedom in axial displacement. The apparatus according to claim 8 .
The control piston (46) is surrounded by a collar (40) of a seating member (36) having the seat (38) provided for the closure (35). . The device according to claim 8 or claim 9 ,
The guide pin (41) is provided with a radial circulation hole (48) that opens when a load is removed from the control piston, and surrounds the control piston (46) communicating therewith. The apparatus characterized in that the interior space of the collar (40) of the seating member (36) communicates with the reflux conduit (10). The apparatus according to any one of claims 1 to 10 ,
In the case of an internal combustion engine having a plurality of injection valves (3) for each cylinder (2), the control device (60) provided for the control piston (46, 70) 2) The load can be removed from only a part of the control pistons (46) of the plurality of the injection valves (3) provided for each, and the control pistons of the remaining injection valves (3) (46) is configured to be able to apply pressure. The apparatus of claim 11 .
The control device (60) provided for the control piston (46, 70) is predetermined to the control piston (46) of the injection valve (3) provided for each cylinder (2). An apparatus configured to be capable of alternately applying pressure or removing a load in a cycle. The apparatus of claim 12 , wherein
The control piston (46, 70) of the injection valve (3) provided for each cylinder (2) is capable of alternately applying pressure and releasing from the load in a cycle of a maximum of 2 minutes. A device characterized by that. The device according to any one of claims 1 to 13 ,
In order to increase the fuel injection pressure, the force exerted from the control piston (70) onto the closure (25) is less than the force to hold the closure (25) in the normal closed position. Features device. The apparatus according to any one of claims 1 to 14,
A device characterized in that a plurality of injection valves (3) are provided for each cylinder (2).

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