KR101067267B1 - Method and apparatus for supplying fuel to marine internal combustion engine - Google Patents

Abstract

Provided are a fuel supply method and apparatus for a marine internal combustion engine that can avoid hard particles from entering a large amount in an engine and can prevent sintering of a piston ring to a cylinder liner.

By outputting the switching signal 4a from the controller 9 to the flow path switching means 4 of the fuel supply line 5 based on the detection signals 6a, 7a, 8a from the level detectors 6, 7, 8; The fuel is sequentially discharged from the fuel tanks 1, 2 and 3, and the fuel level of the fuel tank 1 (or 2) in which the discharge is being performed is detected by the level detector 6 (or 7). When it decreases below the set value based on 6a (or 7a), the discharge of fuel from the next fuel tank 2 (or 3) is started, and the fuel from the fuel tank 1 (or 2) It is comprised so that the fuel from the next fuel tank 2 (or 3) may be mixed at least, and can be supplied in each cylinder 11 of the engine 10 in the state which reduced the hard particle concentration in fuel.

Fuel tank, fuel injection valve, fuel supply, fuel supply line, controller

Description

Method and apparatus for supplying fuel for marine internal combustion engines {Method and apparatus for supplying fuel to marine internal combustion engine}

The present invention relates to a fuel supply method and apparatus for an internal combustion engine for ships.

Generally, in an internal combustion engine for ships, fuel stored in a fuel tank is pumped by a fuel pump, and is supplied to each cylinder of an engine through a fuel injection valve.

Moreover, there exists patent document 1 as showing the general technical level regarding fuel supply of the internal combustion engine for ships.

Patent Document 1: Japanese Unexamined Patent Publication No. 2004-308528

Challenges to be solved by the invention

However, since the fuel contains ceramic hard particles such as alumina or silica used as the catalyst for reforming the fuel, when the fuel stored in the fuel tank is reduced, the fuel is removed from the bottom of the fuel tank. Inside, high concentration of hard particles deposited at the bottom of the fuel tank are also evacuated together with fuel, and the hard particles cannot be removed entirely by a fuel cleaner or filter, In other words, it has a drawback that sintering of a piston ring to a cylinder liner occurs.

In view of such a situation, the present invention is intended to provide a fuel supply method and apparatus for an internal combustion engine for ships that can avoid entering a large amount of hard particles into the engine and prevent sintering of the piston ring to the cylinder liner. will be.

Means to solve the problem

In the fuel supply method of the marine internal combustion engine which discharges the fuel stored in the fuel tank from a bottom part, and feeds it by a fuel pump, and supplies it to each cylinder of an engine through a fuel injection valve, Comprising: It is equipped with several fuel tank. And discharging fuel from each fuel tank, and when the fuel level of the fuel tank being discharged is reduced to or below a set value, the fuel discharged from the fuel tank whose fuel level is reduced to or below a set value and the The fuel supply method of the marine internal combustion engine which mixes the fuel discharged from another fuel tank, and supplies in each cylinder of an engine in the state which reduced the hard particle density | concentration contained in fuel.

With the above configuration, when the fuel is discharged from the plurality of fuel tanks, and the fuel level of the fuel tank being discharged is reduced to or below the set value, the fuel level is reduced to or below the set value. The fuel is discharged into each cylinder of the engine in a state in which the discharged fuel and the fuel discharged from the other fuel tank are mixed to lower the concentration of hard particles contained in the fuel.

As a result, hard particles do not enter the engine in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

In the fuel supply method of the marine internal combustion engine, it is possible to discharge the fuel from the bottom of the other fuel tank while introducing the fuel discharged from the fuel tank whose fuel level has decreased below the set value to the top of the other fuel tank. .

In the fuel supply method of the marine internal combustion engine, a fuel tank in which the fuel level is reduced to a set value or less and a fuel are alternately discharged at predetermined intervals from another fuel tank, and the discharged fuel is disposed downstream. It can also be mixed in a settling tank.

In the fuel supply method of the marine internal combustion engine, fuel may be simultaneously discharged from a fuel tank having the fuel level reduced to a set value or less and another fuel tank.

In the fuel supply method of the marine internal combustion engine, after the fuel discharged from the fuel tank whose fuel level is reduced to a set value or less is introduced into an upper portion of another fuel tank, the fuel may be discharged from the bottom of the other fuel tank. have.

On the other hand, the present invention provides a plurality of fuel tanks in a fuel supply apparatus of a marine internal combustion engine which discharges fuel stored in a fuel tank from a bottom portion and is pumped by a fuel pump and supplied into each cylinder of an engine through a fuel injection valve. And a fuel supply line in which a flow path switching means is arranged to discharge fuel from each of the fuel tanks, a level detector for detecting a fuel level of each of the fuel tanks, and discharge of fuel from each of the fuel tanks. When the fuel level of the fuel tank being performed decreases below the set value based on the detection signal from the level detector, the fuel discharged from the fuel tank whose fuel level decreases below the set value and the other fuel tanks are discharged. Each engine of the engine is mixed with the fuel to be mixed and the concentration of the hard particles contained in the fuel is reduced. In that it can be supplied to a fuel supply system for a marine internal combustion engine provided with a controller for outputting a switching signal to the flow path switching unit of the fuel supply line.

In the fuel supply apparatus of the marine internal combustion engine, fuel is discharged from a plurality of fuel tanks via a fuel supply line, the fuel level of the fuel tank is detected by a level detector, and the fuel of the fuel tank being discharged. When the level decreases below the set value based on the detection signal from the level detector, a switching signal is output from the controller to the flow path switching means of the fuel supply line, and discharged from the fuel tank in which the fuel level decreases below the set value. The fuel to be supplied and the fuel discharged from the other fuel tank are mixed, and the fuel is supplied into each cylinder of the engine in a state in which the concentration of hard particles contained in the fuel is reduced.

As a result, hard particles do not enter the engine in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

In the fuel supply apparatus of the marine internal combustion engine, the fuel supply line is formed by branching from the discharge line and a discharge line connecting the bottom of each fuel tank and a fuel pump, and the fuel level is below a set value. A bypass line for introducing the fuel of the reduced fuel tank to the upper portion of the other fuel tank, and the flow path switching means is formed at the branch of the discharge line and the bypass line, and the fuel level is reduced below the set value. A three-way valve which is switchable to direct fuel of the fuel tank from the discharge line side to the bypass line side, and fuel which is formed during the bypass line and which is guided from the discharge line side to the bypass line side by switching of the three-way valve; An auxiliary pump for pumping the upper portion of the pump, and downstream of the auxiliary pump A mixing changeover valve formed during the bypass line at the side and switchable to introduce the fuel of the fuel tank whose fuel level has decreased below the set value into another fuel tank, and the bottom of the fuel tank from which the fuel is last discharged; It can be configured as a discharge valve which is formed during one discharge line and which is opened when fuel is discharged last from the fuel tank.

In the fuel supply apparatus of the marine internal combustion engine, the fuel supply line is constituted by a discharge line connecting the bottom of each fuel tank and a fuel pump, and the flow path switching means is connected to the bottom of each fuel tank. It is formed during one discharge line and alternately discharges fuel at predetermined intervals from a fuel tank and another fuel tank whose fuel level is reduced below a set value, and is opened and closed to mix the discharged fuel in a settling tank disposed downstream. It can also be configured as a controlled discharge valve.

In the fuel supply apparatus of the marine internal combustion engine, the fuel supply line is constituted by a discharge line connecting the bottom of each fuel tank and a fuel pump, and the flow path switching means is connected to the bottom of each fuel tank. The discharge valve may be configured to be opened and controlled to simultaneously discharge fuel from a fuel tank and another fuel tank which are formed in the middle of one discharge line and whose fuel level is reduced below a set value.

In the fuel supply device of the marine internal combustion engine, the fuel supply line is formed by branching from a downstream side of the fuel pump of the discharge line and a discharge line connecting the bottom of each fuel tank and a fuel pump. A bypass line for introducing the fuel of the fuel tank whose level has fallen below the set value into the upper portion of the other fuel tank, and the flow path switching means is formed in the middle of the discharge line connected to the bottom of each fuel tank; A discharge valve which is opened and closed to discharge fuel from the bottom of another fuel tank after the fuel is discharged from the fuel tank whose fuel level is reduced to a set value or less, and is formed at the branch of the discharge line and the bypass line, and the fuel level From the discharge line side, the fuel of the fuel tank reduced to or below this set value is diverted from the bypass line side. A three-way valve switchable to guide and a fuel tank formed during the bypass line on the downstream side of the three-way valve and having the fuel level reduced below a set value on the other fuel tank, It may also be configured as a mixing switch valve switchable to introduce fuel exiting the bottom into the top of the same fuel tank.

Effects of the Invention

According to the fuel supply method and apparatus of the marine internal combustion engine of the present invention, it is possible to avoid the hard particles from entering the engine in large quantities, and to have an excellent effect of preventing the sintering of the piston ring to the cylinder liner.

1 is an overall schematic configuration diagram showing a first embodiment of the present invention.

2 is an overall schematic configuration diagram showing a second embodiment of the present invention;

3 is an overall schematic configuration diagram showing a third embodiment of the present invention;

Description of the Related Art [0002]

1: fuel tank 2: fuel tank

3: fuel tank 4: flow path switching means

4a: switching signal 5: fuel supply line

6: level detector 6a: detection signal

7: level detector 7a: detection signal

9 controller 10 engine

11 cylinder 12 fuel pump

13: discharge line 14: bypass line

15: 3-way valve 15 ': discharge valve

15a: switching signal 16: 3-way valve

16 ': discharge valve 16a: switching signal

17: discharge valve 17a: switching signal

18: auxiliary pump 18a: switching signal

19: mixing switching valve 19a: switching signal

20: mixing switching valve 20a: switching signal

21: sedimentation tank 22: feed pump

23: fuel injection valve 24: three-way valve

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention, in which a plurality of fuel tanks (three in the example of FIG. 1) filled with fuel are provided, and each of the fuel tanks 1, 2, 3 is provided. A level for connecting the fuel supply line 5 in which the flow path switching means 4 is disposed so as to sequentially discharge the fuel at the bottom of the fuel tank, and detecting the fuel level in each of the fuel tanks 1, 2, 3. The detectors 6, 7, 8 are provided, and the flow path of the fuel supply line 5 from the controller 9 based on the detection signals 6a, 7a, 8a from the level detectors 6, 7, 8 By outputting the switching signal 4a to the switching means 4, the fuel of the fuel tank 1 (or 2) discharged is sequentially discharged from the respective fuel tanks 1, 2 and 3, and discharged. Discharge of fuel from the next fuel tank 2 (or 3) when the level decreases below a set value based on the detection signal 6a (or 7a) from the level detector 6 (or 7). At least the fuel discharged from the fuel tank 1 (or 2) and the fuel discharged from the next fuel tank 2 (or 3) at which the fuel level is lowered below a set value are included in the fuel. It is comprised so that supply may be possible in each cylinder 11 of the engine 10 in the state which reduced hard particle concentration.

In the present embodiment, the fuel supply line 5 includes a discharge line 13 connecting the bottoms of the fuel tanks 1, 2, 3 and the fuel pump 12, and from the discharge line 13. Consisting of a bypass line 14 for introducing the fuel of the fuel tank 1 (or 2), which is formed branched and whose fuel level has fallen below the set value, to the top of the next fuel tank 2 (or 3). It is.

Further, the flow path switching means 4 is formed at the branch portions of the discharge line 13 and the bypass line 14, and the fuel of the fuel tank 1 (or 2) in which the fuel level is reduced below a set value. Is formed in the middle of the bypass line 14 and the three-way valve 15 (or 16), which is switchable to direct the discharge from the discharge line 13 side to the bypass line 14 side, and the three-way valve 15 (or 16). ) And an auxiliary pump 18 for pumping fuel guided from the discharge line 13 side to the bypass line 14 side by the switching of the fuel tank 1, 2, 3 to the upper portion of the next fuel tank 1 18 so as to introduce fuel from the fuel tank 1 (or 2) which is formed during the bypass line 14 on the downstream side and whose fuel level has decreased below the set value to the next fuel tank 2 (or 3). Possible mixing changeover valves 19, 20 and the last of the fuel tanks 1, 2, 3 (third in the example of FIG. 1) It consists of the discharge valve 17 formed in the middle of the discharge line 13 connected to the bottom part of the fuel tank 3 from which fuel is discharged, and opened when the fuel is discharged | emitted from the said fuel tank 3 last.

That is, the switching signal 4a opens and closes the switching signal 15a for changing the three-way valve 15, the switching signal 16a for changing the three-way valve 16, and the discharge valve 17. A switching signal 17a to be turned on, a switching signal 18a to turn on and off the auxiliary pump 18, a switching signal 19a to open and close the mixing switching valve 19, and the mixing switching valve 20 It has the switching signal 20a which opens and closes.

1, 21 is a settling tank formed in the discharge line 13 diagram downstream from the said fuel pump 12, 22 is a supply pump for conveying the fuel in the settling tank 21, 23 is a supply pump 22 It is a fuel injection valve for injecting the fuel pumped by the) into the cylinder 11 of the engine 10.

In addition, since fuel cannot be replenished while the ship is sailing, the total capacity of the fuel tanks 1, 2, and 3 is a capacity capable of sufficiently covering the one-time navigation distance, and the fuel from which the fuel is discharged last. The fuel is replenished before the fuel level in the tank 3 decreases below the set value.

Next, the operation of the above embodiment will be described.

In the present embodiment, among the plurality of fuel tanks 1, 2, 3 filled with fuel, the fuel is first discharged from the fuel tank 1 via the discharge line 13 of the fuel supply line 5, and the fuel pump ( 12 is pressurized to the settling tank 21, and the fuel once stored in the settling tank 21 is fed to the fuel injection valve 23 by the feed pump 22, and from the fuel injection valve 23 It is injected into each cylinder 11 of the engine 10.

At this time, the three-way valve 15 is turned to the discharge line 13 side by the switching signal 15a from the controller 9, and the three-way valve 16 is the switching signal 16a from the controller 9 at this time. By the switching signal 17a from the controller 9, the auxiliary pump 18 is turned off by the switching signal 18a from the controller 9, The mixing switching valve 19 is closed by the switching signal 19a from the controller 9, and the mixing switching valve 20 is closed by the switching signal 20a from the controller 9.

The fuel level of the fuel tank 1 is detected by the level detector 6, and the fuel level of the fuel tank 1 from which the discharge is being made is detected by the detection signal 6a from the level detector 6. When reduced to below the set value as shown by the imaginary line of FIG. 1 on the basis, the three-way valve 15 is a bypass line from the discharge line 13 side by the switching signal 15a from the controller 9. At the same time, the three-way valve 16 is switched to the discharge line 13 side by the switching signal 16a from the controller 9, and the auxiliary pump 18 switches to the switching signal from the controller 9 ( 18a), the mixing switching valve 19 is opened by the switching signal 19a from the controller 9, whereby the discharge line of the fuel from the next fuel tank 2 ( Fuel tank 1 in which the fuel level has decreased below the set value as discharge to 13 is started; The fuel discharged from the upper side is sucked up to the bypass line 14 side by the operation of the auxiliary pump 18 which is in the on state, and the upper portion of the next fuel tank 2 is opened through the open mixing switching valve 19. Fuel in the fuel tank 2 introduced into the fuel tank 2 and mixed with the fuel stored in the next fuel tank 2 and in which high concentration of hard particles do not settle at the bottom is supplied with the fuel pump 12 and the precipitation tank 21. It is supplied into each cylinder 11 of the engine 10 via the pump 22 and the fuel injection valve 23.

As a result, hard particles do not enter the engine 10 in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

In addition, when the fuel tank 1 is empty, the three-way valve 15 is closed by the switching signal 15a from the controller 9, and the auxiliary pump 18 switches from the controller 9. The signal 18a is turned off, the mixing changeover valve 19 is closed by the changeover signal 19a from the controller 9, and discharge of fuel from the bottom of the fuel tank 2 continues. It is done.

Thereafter, the fuel level of the fuel tank 2 is detected by the level detector 7, and the fuel level of the fuel tank 2 in which the discharge is being performed is detected by the detection signal 7a from the level detector 7. On the basis of the decrease in the value below the set value, the three-way valve 16 is switched from the discharge line 13 side to the bypass line 14 side by the switching signal 16a from the controller 9, and at the same time, the discharge valve 17 is opened by the switching signal 17a from the controller 9, the auxiliary pump 18 is turned on again by the switching signal 18a from the controller 9, and the mixing switching valve 20 ) Is opened by the switching signal 20a from the controller 9, whereby the discharge of the fuel from the next fuel tank 3 to the discharge line 13 is started, so that the fuel level is at the set value. The fuel discharged from the fuel tank 2 which reduced below is the beam which became the said ON state It is sucked up to the bypass line 14 side by the operation of the pump 18 and introduced into the upper portion of the next fuel tank 3 through the open mixing switch valve 20, and into the next fuel tank 2. The fuel in the fuel tank 3, which is mixed with the stored fuel and does not precipitate high concentration of hard particles at the bottom, passes through the fuel pump 12, the precipitation tank 21, the supply pump 22, and the fuel injection valve 23. Since it is supplied in each cylinder 11 of the engine 10, there is no possibility that hard particle may enter the engine 10 in large quantities and sinter the piston ring with respect to a cylinder liner.

In addition, the fuel is replenished before the fuel level of the fuel tank 3 in which the fuel is finally discharged falls below a set value, and the above operation is repeated.

In this way, hard particles can be avoided from entering the engine 10 in large quantities, and sintering of the piston ring to the cylinder liner can be prevented.

FIG. 2 is a second embodiment of the present invention. In the drawings, parts denoted by the same reference numerals in FIG. 1 mean the same thing, and the basic configuration is the same as that shown in FIG. As shown in FIG. 2, the said fuel supply line 5 is comprised by the discharge line 13 which connects the bottom part of each said fuel tank 1, 2, 3 and the fuel pump 12, The flow path switching means 4 is composed of discharge valves 15 ', 16', 17 formed in the middle of the discharge line 13 connected to the bottoms of the respective fuel tanks 1, 2, 3, and the discharge valve ( 15 ', 16', 17 to the switching signals 15a ', 16a', 17a output from the controller 9 in accordance with the detection signals 6a, 7a, 8a from the level detectors 6, 7, 8; The fuel tank 1 (or 2) and the next fuel tank 2 (or 3) in which the fuel level is reduced to or lower than a set value, and at regular intervals. By discharging the fuel, and a point to be mixed in the settling tank 21 is disposed the fuel on the downstream side.

In the example shown in FIG. 2, first of the plurality of fuel tanks 1, 2, 3 filled with fuel, the fuel is discharged from the fuel tank 1 via the discharge line 13 of the fuel supply line 5, The fuel pump 12 is pumped to the settling tank 21, the fuel once stored in the settling tank 21 is pumped to the fuel injection valve 23 by the feed pump 22, the fuel injection valve ( 23 is injected into each cylinder 11 of the engine 10.

At this time, the discharge valve 15 'is opened by the switching signal 15a' from the controller 9, the discharge valve 16 'is closed by the switching signal 16a' from the controller 9, The discharge valve 17 is closed by the switching signal 17a from the controller 9.

The fuel level of the fuel tank 1 is detected by the level detector 6, and the fuel level of the fuel tank 1 in which the discharge is being made is based on the detection signal 6a from the level detector 6. As shown by the imaginary line of FIG. 2, when it is reduced below the set value, the discharge valves 15 'and 16' are fixed at predetermined time intervals by the switching signals 15a 'and 16a' from the controller 9. A settling tank in which fuel is discharged alternately at regular intervals from the fuel tank 1 and the next fuel tank 2, which are alternately opened and closed, and the fuel level is reduced to a set value or less, and the fuel is disposed downstream; 21 is mixed into the respective cylinders 11 of the engine 10 via the feed pump 22 and the fuel injection valve 23.

As a result, hard particles do not enter the engine 10 in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

Further, when the fuel tank 1 is empty, the discharge valve 15 'is closed by the switching signal 15a' from the controller 9, and the discharge valve 16 'is closed by the controller 9. Is maintained in the open state by the switching signal 16a 'from, and fuel is discharged continuously from the bottom of the fuel tank 2 alone.

Thereafter, the fuel level of the fuel tank 2 is detected by the level detector 7, and the fuel level of the fuel tank 2 in which the discharge is being performed is detected by the detection signal 7a from the level detector 7. When it is lowered below the set value based on the above, the discharge valves 16 ', 17 are alternately opened and closed at regular time intervals by the switching signals 16a', 17 from the controller 9, and the fuel level Fuel is alternately discharged at regular intervals from the fuel tank 2 and the next fuel tank 3 reduced to or below this set value, and the fuel is mixed in a settling tank 21 disposed downstream and the settling tank Since the fuel which reduced the hard particle concentration from 21 is supplied into each cylinder 11 of the engine 10 via the supply pump 22 and the fuel injection valve 23, hard particle | grains are largely supplied to the engine 10. FIG. To cause sintering of the piston ring to the cylinder liner I don't want to.

In addition, the fuel is replenished before the fuel level of the fuel tank 3 from which the fuel is discharged lastly decreases below a set value, and the above operation is repeated.

In this way, also in the case of the example shown in FIG. 2, as in the case of the example shown in FIG. 1, hard particles can be prevented from entering the engine 10 in a large amount, and sintering of the piston ring to the cylinder liner can be prevented. Can be.

On the other hand, using the device configuration shown in Fig. 2, the discharge valves 15 ', 16', 17 are based on the detection signals 6a, 7a, 8a from the level detectors 6, 7, 8; Opening and closing control by the switching signals 15a ', 16a', and 17a output from the controller 9, and the fuel tank 1 (or 2) and the next fuel tank 2 whose fuel level is reduced to a set value or less. (Or 3)) may simultaneously discharge fuel.

Also in this case, among the plurality of fuel tanks 1, 2, 3 filled with fuel, the fuel is first discharged from the fuel tank 1 via the discharge line 13 of the fuel supply line 5, and the fuel pump ( 12 is pressurized to the settling tank 21, and the fuel once stored in the settling tank 21 is fed to the fuel injection valve 23 by the feed pump 22, and from the fuel injection valve 23 It is injected into each cylinder 11 of the engine 10.

At this time, the discharge valve 15 'is opened by the switching signal 15a' from the controller 9, the discharge valve 16 'is closed by the switching signal 16a' from the controller 9, The discharge valve 17 is closed by the switching signal 17a from the controller 9.

The fuel level of the fuel tank 1 is detected by the level detector 6, and the fuel level of the fuel tank 1 in which the discharge is being performed is based on the detection signal 6a from the level detector 6. As shown by the imaginary line of FIG. 2, when it is reduced below the set value, in addition to the open discharge valve 15 ', the discharge valve 16' is connected to the switching signal 16a 'from the controller 9; The fuel is discharged simultaneously from the fuel tank 1 and the next fuel tank 2 which are opened at the same time, and the fuel level is reduced to the set value or less, and the fuel having reduced hard particle concentration is the fuel pump 12 and the precipitation tank ( It is supplied into each cylinder 11 of the engine 10 via 21, the feed pump 22, and the fuel injection valve 23. As shown in FIG.

As a result, hard particles do not enter the engine 10 in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

Further, when the fuel tank 1 is empty, the discharge valve 15 'is closed by the switching signal 15a' from the controller 9, and the discharge valve 16 'is closed by the controller 9. Is maintained in the open state by the switching signal 16a 'from, and fuel is discharged continuously from the bottom of the fuel tank 2 alone.

Thereafter, the fuel level of the fuel tank 2 is detected by the level detector 7, and the fuel level of the fuel tank 2 in which the discharge is being performed is detected by the detection signal 7a from the level detector 7. When it is lowered below the set value on the basis of, the discharge valve 17 is simultaneously opened by the switching signal 17a from the controller 9 in addition to the open discharge valve 16 ', and the fuel level is set. The fuel is discharged simultaneously from the fuel tank 2 and the next fuel tank 3 reduced below the value, and the fuel having reduced hard particle concentration is supplied with the fuel pump 12, the precipitation tank 21, the feed pump 22, Since it is supplied into each cylinder 11 of the engine 10 via the fuel injection valve 23, there is no possibility that hard particle may enter the engine 10 in large quantities and sinter the piston ring with respect to a cylinder liner.

In addition, the fuel is replenished before the fuel level of the fuel tank 3 from which the fuel is discharged lastly decreases below a set value, and the above operation is repeated.

In this way, even in the case where only the control is changed using the apparatus configuration as shown in FIG. 2, hard particles can be prevented from entering the engine 10 in a large amount as in the case of the example shown in FIG. 1, and the cylinder liner It is possible to prevent the sintering of the piston ring to the.

FIG. 3 is a third embodiment of the present invention, wherein in the drawings, the same reference numerals in FIGS. 1 and 2 mean the same thing, and the basic configuration is the same as that shown in FIG. As shown in FIG. 3, the fuel supply line 5 includes a discharge line 13 connecting the bottom of each of the fuel tanks 1, 2, and 3 to the fuel pump 12. The fuel of the fuel tank 1 (or 2) branched from the downstream side of the fuel pump 12 of the discharge line 13 and whose fuel level is lower than or equal to a set value is transferred to the next fuel tank 2 (or 3) in the middle of the discharge line 13 connected to the bottom of each of the fuel tanks 1, 2, 3, and configured as a bypass line 14 for introducing into the upper portion of the fuel tank 1, 2, 3, respectively. To drain fuel from the fuel tank 1 (or 2) which is formed and whose fuel level has decreased below the set value. After the discharge, the discharge valves 15 ', 16', 17 which are opened and closed to discharge fuel from the bottom of the next fuel tank 2 (or 3), and the discharge line 13 and the bypass line 14 A three-way valve 24 formed in the branch portion and switchable to guide the fuel of the fuel tank 1 (or 2) whose fuel level has decreased below the set value from the discharge line 13 side to the bypass line 14 side; And the fuel of the fuel tank 1 (or 2) formed in the middle of the bypass line 14 on the downstream side from the three-way valve 24 and whose fuel level is lower than or equal to a set value. 3)) and then switchable to the top of the same fuel tank 2 (or 3) as the fuel discharged from the bottom of the next fuel tank 2 (or 3). , 20), and the discharge valves 15 ', 16', 17, three-way valve 24 and the mixing switching valve (19, 20) level Opening / closing control by the switching signals 15a ', 16a', 17a ', 24a, 19a, 20a output from the controller 9 based on the detection signals 6a, 7a, 8a from the outlets 6, 7, 8 The fuel discharged from the fuel tank 1 (or 2) having the fuel level reduced to a predetermined value or less is introduced into the upper portion of the next fuel tank 2 (or 3), and then the next fuel tank 2 (Or 3) the fuel is discharged from the bottom.

In the example shown in FIG. 3, first of the plurality of fuel tanks 1, 2, 3 filled with fuel, the fuel is discharged from the fuel tank 1 via the discharge line 13 of the fuel supply line 5, The fuel pump 12 is pumped to the settling tank 21, the fuel once stored in the settling tank 21 is pumped to the fuel injection valve 23 by the feed pump 22, the fuel injection valve ( 23 is injected into each cylinder 11 of the engine 10.

At this time, the discharge valve 15 'is opened by the switching signal 15a' from the controller 9, the discharge valve 16 'is closed by the switching signal 16a' from the controller 9, The discharge valve 17 is closed by the switch signal 17a from the controller 9, and the three-way valve 24 is turned to the bypass line 14 side by the switch signal 24a from the controller 9. Instead, it is turned to the side leading to the settling tank 21, the mixing switching valve 19 is closed by the switching signal 19a from the controller 9, and the mixing switching valve 20 is the switching signal from the controller 9 It is closed by 20a.

The fuel level of the fuel tank 1 is detected by the level detector 6, and the fuel level of the fuel tank 1 in which the discharge is being made is based on the detection signal 6a from the level detector 6. When reduced below the set value as shown by the imaginary line of FIG. 3, the said three-way valve 24 turns to the bypass line 14 side by the switch signal 24a from the controller 9, and the said mixing The switching valve 19 is opened by the switching signal 19a from the controller 9, whereby the fuel discharged from the fuel tank 1 in which the fuel level has decreased below the set value is the fuel pump 12 Bypasses the bypass line 14 via the three-way valve 24 and is introduced into the upper portion of the next fuel tank 2 through the open mixing switch valve 19, It mixes with the fuel stored in the fuel tank (2).

When the fuel tank 1 is empty, the discharge valve 15 'is closed by the switch signal 15a' from the controller 9, and the discharge valve 16 'is switched by the controller 9. The fuel in the fuel tank 2 which is opened by 16a 'and does not deposit high concentration of hard particles at the bottom is once bypassed via the three-way valve 24 by the operation of the fuel pump 12 14, bypasses the side, and is introduced into the upper portion of the fuel tank 2 through the open mixing switch valve 19, whereby the hard particle concentration remaining in the discharge line 13 of the fuel supply line 5 is maintained. The fuel having a higher concentration is replaced by the fuel having a lower hard particle concentration.

After the fuel having a high hard particle concentration remaining in the discharge line 13 of the fuel supply line 5 is replaced by the fuel having a low hard particle concentration, the three-way valve 24 is switched from the controller 9. At the same time again by signal 24a, the mixing changeover valve 19 is closed by a changeover signal 19a from the controller 9 and the fuel from the next fuel tank 2 is closed by the fuel pump 12 And the three-way valve 24, the settling tank 21, the feed pump 22, and the fuel injection valve 23 are supplied into the respective cylinders 11 of the engine 10.

As a result, hard particles do not enter the engine 10 in large quantities, and sintering of the piston ring to the cylinder liner does not occur.

Thereafter, the fuel level of the fuel tank 2 is detected by the level detector 7, and the fuel level of the fuel tank 2 in which the discharge is being performed is detected by the level detector 7 from the detection signal 7a. When it is lowered below the set value on the basis of the reference value), the three-way valve 24 is turned to the bypass line 14 side by the switching signal 24a from the controller 9, and the mixing switching valve 20 is Opened by the switching signal 20a from the controller 9, whereby the fuel discharged from the fuel tank 2 whose fuel level has decreased below the set value is controlled by the operation of the fuel pump 12. Bypass to the bypass line 14 side via a three-way valve 24, introduced into the upper portion of the next fuel tank 3 through the open mixing switch valve 20, and stored in the next fuel tank 3 With mixed fuel.

When the fuel tank 2 becomes empty, the discharge valve 16 'is closed by the switch signal 16a' from the controller 9, and the discharge valve 17 is switched signal from the controller 9 The bypass line 14 via the three-way valve 24 via the three-way valve 24 by the operation of the fuel pump 12 once opened in the fuel tank 3, which is opened by 17a) and does not deposit high concentration of hard particles at the bottom. Bypassed to the side and introduced into the upper portion of the fuel tank 3 through the open mixing switching valve 20, whereby the hard particle concentration remaining in the discharge line 13 of the fuel supply line 5 is high. The fuel is replaced with a fuel having a low hard particle concentration.

After the fuel having a high hard particle concentration remaining in the discharge line 13 of the fuel supply line 5 is replaced by the fuel having a low hard particle concentration, the three-way valve 24 is switched from the controller 9. At the same time it is changed again by the signal 24a, the mixing changeover valve 20 is closed by the changeover signal 20a from the controller 9 and the fuel from the next fuel tank 3 is fuel pump 12 Hard particles are fed into the respective cylinders 11 of the engine 10 via the three-way valve 24, the settling tank 21, the feed pump 22, and the fuel injection valve 23. ), There is no fear of sintering of the piston ring to the cylinder liner.

In addition, the fuel is replenished before the fuel level of the fuel tank 3 from which the fuel is discharged lastly decreases below a set value, and the above operation is repeated.

In this way, also in the case of the example shown in FIG. 3, it can avoid that a large amount of hard particle enters the engine 10 like the case of the example shown in FIG. 1 and FIG. 2, and sintering of the piston ring with respect to a cylinder liner is prevented. It can prevent.

Furthermore, in the case of the example shown in FIG. 3, since the bypass line 14 is extended to the said fuel tanks 2 and 3 from the downstream side of the fuel pump 12, compared with the case of the example shown in FIG. The return pipe may not be provided from the fuel tanks 1 and 2.

In addition, the fuel supply method and apparatus of the internal combustion engine for ships of this invention are not limited only to the above-mentioned illustration, The number of fuel tanks is not limited to three, It is also possible to set it as two or four or more in plurality. In addition, of course, various changes can be added within the range which does not deviate from the summary of this invention.

Claims (10)

In the fuel supply method of the internal combustion engine for ships which discharges the fuel stored in the fuel tank from a bottom part, and feeds it with a fuel pump, and supplies it to each cylinder of an engine through a fuel injection valve, A fuel tank having a plurality of fuel tanks, configured to discharge fuel from each fuel tank, and when the fuel level of the fuel tank being discharged is reduced to or below a set value, the fuel tank is reduced to or below a set value. A fuel supply method for an internal combustion engine for ships, which mixes the fuel discharged from the fuel discharged from the other fuel tanks and supplies the fuel discharged from the other fuel tanks into the respective cylinders of the engine in a state of decreasing the concentration of hard particles contained in the fuel. The fuel supply method for a marine internal combustion engine according to claim 1, wherein the fuel discharged from the fuel tank having the fuel level reduced below a set value is discharged from the bottom of the other fuel tank while introducing the fuel to the top of the other fuel tank. . 2. The fuel tank according to claim 1, wherein fuel is reduced from the fuel level below a set value and fuel is alternately discharged from other fuel tanks at predetermined intervals, and the discharged fuel is mixed in a settling tank disposed downstream. Fuel supply method of an internal combustion engine for ships. The fuel supply method for a marine internal combustion engine according to claim 1, wherein the fuel tank in which the fuel level decreases below a set value and fuel are discharged simultaneously from another fuel tank. The fuel supply of the marine internal combustion engine according to claim 1, wherein the fuel discharged from the fuel tank in which the fuel level is reduced below a set value is introduced into an upper portion of another fuel tank, and then the fuel is discharged from the bottom of the other fuel tank. Way. In the fuel supply apparatus of the marine internal combustion engine which discharges the fuel stored in the fuel tank from a bottom part, and feeds it by a fuel pump, and supplies it to each cylinder of an engine through a fuel injection valve, A plurality of fuel tanks, A fuel supply line in which flow path switching means is arranged to discharge fuel from each fuel tank; A level detector for detecting a fuel level of each fuel tank; A fuel tank whose fuel level has decreased below the set value when the fuel level of the fuel tank that is being discharged is reduced below the set value in accordance with a detection signal from the level detector when the fuel is discharged from each of the fuel tanks; Outputting a switching signal to the flow path switching means of the fuel supply line so that the fuel discharged from the fuel mixture from the fuel discharged from the other fuel tank and the fuel discharged from the other fuel tank are mixed and can be supplied into the respective cylinders of the engine while the concentration of the hard particles contained in the fuel is reduced. A fuel supply device for an internal combustion engine for ships having a controller for controlling the damage. The method of claim 6, wherein the fuel supply line, A discharge line connecting the bottom of each fuel tank to a fuel pump; A bypass line for introducing the fuel of the fuel tank which is formed branching from the discharge line and whose fuel level has decreased below the set value, to the upper portion of the other fuel tank, The flow path switching means, A three-way valve formed at a branch of the discharge line and the bypass line and switchable to guide the fuel of the fuel tank having the fuel level reduced below a set value from the discharge line side to the bypass line side; An auxiliary pump which is formed in the middle of the bypass line and which induces fuel directed from the discharge line side to the bypass line side by switching of the three-way valve, to the upper portion of the other fuel tank; A mixing changeover valve formed during the bypass line on the downstream side of the auxiliary pump and switchable to introduce the fuel of the fuel tank into which the fuel level is reduced below a set value to another fuel tank; A fuel supply apparatus for a marine internal combustion engine, comprising a discharge valve formed in the middle of a discharge line connected to the bottom of a fuel tank from which the fuel is last discharged from the fuel tank, and opened when the fuel is discharged from the fuel tank last. The method of claim 6, wherein the fuel supply line, At the same time as a discharge line connecting the bottom of each fuel tank and the fuel pump, The flow path switching means, Fuel is alternately discharged at predetermined intervals from a fuel tank and another fuel tank formed in the middle of a discharge line connected to the bottom of each of the fuel tanks and the fuel level is reduced to a set value or less, and the discharged fuel is discharged downstream. A fuel supply device for an internal combustion engine for ships, comprising a discharge valve that is opened and closed to mix in a settling tank disposed therein. The method of claim 6, The fuel supply line, At the same time as a discharge line connecting the bottom of each fuel tank and the fuel pump, The flow path switching means, A fuel supply device for a marine internal combustion engine, which is formed in the middle of a discharge line connected to the bottom of each fuel tank, and is composed of a discharge valve which is opened and controlled to simultaneously discharge fuel from a fuel tank and another fuel tank whose fuel level is reduced to a set value or less. . The method of claim 6, wherein the fuel supply line, A discharge line connecting the bottom of each fuel tank and a fuel pump; And a bypass line for introducing the fuel of the fuel tank branched from the downstream side of the discharge pump from the discharge line and having the fuel level reduced below a set value to the upper portion of the other fuel tank, The flow path switching means, A discharge valve which is formed in the middle of a discharge line connected to the bottoms of the respective fuel tanks and which is opened and controlled to discharge the fuel from the bottoms of the other fuel tanks after the fuels are discharged from the fuel tanks whose fuel level has decreased below the set value; A three-way valve formed at a branch of the discharge line and the bypass line and switchable to guide the fuel of the fuel tank having the fuel level reduced below a set value from the discharge line side to the bypass line side; The fuel discharged from the bottom of the other fuel tank after introducing the fuel of the fuel tank formed in the middle of the bypass line on the downstream side than the three-way valve and having the fuel level reduced below the set value to the top of the other fuel tank is the same fuel tank. A fuel supply device for an internal combustion engine for ships composed of a mixing switching valve switchable to be introduced at an upper portion of the engine.

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