JP5195305B2 - Fuel injection system - Google Patents

Description

  The present invention relates to a fuel injection system that injects fuel into an internal combustion engine.

  In fuel injection systems for diesel engines, when fatty acids such as oleic acid that are components such as lubricants added to fuel react with metal ions such as Na and K in the fuel, oleic acid Na insoluble in light oil, etc. There is a problem that the fatty acid salt is generated and the fatty acid salt is deposited on the sliding portion of the injector and the like, and the fuel injection system components such as the injector cause malfunction.

Therefore, a method has been proposed in which an ion exchanger is disposed in a fuel path between a fuel tank and an injector, and a metal component in the fuel is adsorbed on the ion exchanger by ion exchange to remove the metal component in the fuel. (For example, refer to Patent Documents 1 and 2).
JP 2006-105092 A Japanese Utility Model Publication No. 3-59012

  However, since the fuel contains only a small amount of water of about several tens of ppm, the metal components in the fuel are not easily ionized, and most of the metal components are not in an ionic state but in a fatty acid salt or inorganic salt state. It is thought that exists. Therefore, it is difficult to reliably remove the metal component in the fuel only by arranging the ion exchanger in the fuel path.

  An object of this invention is to make it possible to remove more reliably the metal component in a fuel in view of the said point.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a fuel injection system for increasing the pressure of fuel stored in the fuel tank (4) and injecting the fuel into the internal combustion engine. 41, 62, 73, 122, 132) in the fuel path through which the fuel flows, and the ion exchanger (11) that adsorbs metal ions by ion exchange is provided in the water reservoir (41, 62, 73, 122, 132), and is disposed in a submerged state.

  According to this, since water exists around the ion exchanger (11), the metal component contained in the fuel is reliably ionized when the fuel passes around the ion exchanger (11). Therefore, the metal component in the fuel can be adsorbed on the ion exchanger (11) by ion exchange, and the metal component in the fuel can be reliably removed.

  According to a second aspect of the present invention, in the fuel injection system according to the first aspect, a filter container (71) through which fuel flows and a solid impurity contained in the fuel contained in the filter container (71) are removed. A fuel filter (7) having a filter element (72) to be captured is provided, and a water reservoir (73) is formed in the filter container (71) below the filter element (72).

  According to this, an ion exchanger can be arrange | positioned in the state immersed in water, without changing a shape significantly from the conventional filter shape.

  According to a third aspect of the present invention, in the fuel injection system according to the second aspect, the fuel filter (7) includes a drain pipe (74) for discharging the water accumulated in the water reservoir (73) to the outside. The drain pipe (74) communicates with the water reservoir (73) at a position above the upper surface of the ion exchanger (11).

  According to this, when the water accumulated in the water reservoir (73) is discharged to the outside, the water level in the water reservoir (73) does not fall below the upper surface of the ion exchanger (11). The submerged state of the ion exchanger (11) is maintained.

  According to a fourth aspect of the present invention, in the fuel injection system according to the first aspect, water separation is performed by separating water from the fuel flowing through the interior and storing the separated water and fuel in the water separator container (61). The water reservoir (62) is formed in the bottom part side in the water separator container (61).

  According to this, an ion exchanger can be arrange | positioned in the state immersed in water, without changing a shape significantly from the conventional water separator.

  According to a fifth aspect of the present invention, in the fuel injection system according to the fourth aspect, the water separator (6) is a drain pipe (63) for discharging water accumulated in the water reservoir (62) to the outside. The drain pipe (63) communicates with the water reservoir (62) at a position above the upper surface of the ion exchanger (11).

  According to this, when the water accumulated in the water reservoir (62) is discharged to the outside, the water surface of the water reservoir (62) does not fall below the upper surface of the ion exchanger (11). The submerged state of the exchanger (11) is maintained.

  According to a sixth aspect of the present invention, in the fuel injection system according to the fifth aspect, the water separator (6) includes a water repellent sheet (64) that does not allow water to pass through the fuel, and the water repellent sheet (64). ) Is characterized in that the drain pipe (63) is disposed above the position communicating with the water reservoir (62).

  According to this, the water accumulated in the water reservoir (62) can be prevented from flowing out into the fuel path, so that the submerged state of the ion exchanger (11) is reliably maintained.

  According to a seventh aspect of the present invention, in the fuel injection system according to the first aspect, a first water reservoir (12) having a first water reservoir container (121) for storing water therein is disposed in the fuel path. A second water reservoir (13) having a second water reservoir container (131) forming a water reservoir (132) is disposed below the first water reservoir (12), and the first water reservoir It is characterized in that water is circulated between the container (121) and the water reservoir (132).

  According to this, the ion exchanger (11) can be replaced together with the container.

  According to an eighth aspect of the present invention, in the fuel injection system according to the first aspect, a water reservoir (12) having a water reservoir container (121) forming a water reservoir (122) is disposed in the fuel path. It is characterized by being.

  According to this, the second water reservoir (13) can be omitted.

According to the ninth aspect of the present invention, there is provided a fuel injection system for increasing the pressure of fuel stored in the fuel tank (4) and injecting the fuel into the internal combustion engine, wherein the water reservoir (41) for storing water is provided in the fuel tank (4). The ion exchanger (11), which is formed at the bottom of () and adsorbs metal ions by ion exchange, is disposed in a state of being submerged in the water reservoir (41) .

  According to this, the ion exchanger (11) can be submerged. Further, since the fuel in the fuel tank (4) is always in contact with the water around the ion exchanger (11), even when the fuel is not flowing, the metal component in the fuel is ionized and the metal component in the fuel. Is removed.

  According to a tenth aspect of the present invention, in the fuel injection system according to the ninth aspect, the fuel path has a return fuel pipe (10) for returning a part of the fuel sent from the fuel tank (4) to the fuel tank (4). ), And the fuel discharged from the return fuel pipe (10) flows toward the ion exchanger (11).

  According to this, the fuel which has returned to the fuel tank (4) can be reliably brought into contact with the water around the ion exchanger (11), and the metal component contained in the fuel is reliably ionized.

  According to an eleventh aspect of the present invention, in the fuel injection system according to any one of the first to tenth aspects, the magnet (14) is disposed upstream of the ion exchanger (11) in the fuel flow. It is characterized by.

  According to this, since the ionization of the metal component in the fuel is promoted when the fuel passes through the magnetic field, the metal component in the fuel can be more reliably removed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a diagram showing an overall configuration of a fuel injection system according to the first embodiment.

  As shown in FIG. 1, the fuel injection system includes a common rail 1 in which high-pressure fuel is stored, and a plurality of injectors 2 are connected to the common rail 1. The injector 2 is controlled by a control device (hereinafter referred to as ECU) 3 and opens at a predetermined time for a predetermined period, and the high-pressure fuel supplied from the common rail 1 is put into each cylinder of a diesel engine (not shown). Spray. Here, only the injector 2 corresponding to one of the four-cylinder engines is shown, and illustration of the injectors corresponding to the other cylinders is omitted.

  The high-pressure fuel stored in the common rail 1 is supplied from a fuel supply device. The fuel supply device includes a fuel tank 4 that stores fuel, a feed pump 5 that pumps fuel from the fuel tank 4 and pumps it at a low pressure, a water separator 6 that separates water from the fuel and stores the separated water therein, A fuel filter 7 that traps solid impurities in the fuel and stores water separated from the fuel therein, a high pressure pump 9 that pressurizes the fuel supplied from the feed pump 5 and pumps it to the common rail 1, and the feed pump 5 to the high pressure pump 9. It has a metering valve 8 or the like for adjusting the flow rate of the fuel supplied to. Then, by adjusting the flow rate of the fuel supplied to the high pressure pump 9 by the metering valve 8, the discharge amount of the high pressure pump 9 is controlled.

  The high pressure pump 9 is configured such that a cam shaft is rotationally driven by a diesel engine, a driving force is transmitted from the cam shaft, and a plunger reciprocates to suck and pump fuel. Further, the high-pressure pump 9 is configured such that fuel is also supplied to the cam chamber in which the cam shaft is disposed, and the fuel supplied to the cam chamber acts as lubricating oil. The fuel supplied to the cam chamber of the high-pressure pump 9 and the leaked fuel from the injector 2 are returned to the fuel tank 4 via the return fuel pipe 10.

  The common rail 1, the injector 2, and the components of the fuel supply device (that is, the fuel tank 4, the feed pump 5, the water separator 6, the fuel filter 7, the metering valve 8, and the high pressure pump 9) are the fuel of the present invention. Configure the route. The return fuel pipe 10, the fuel pipe connecting the common rail 1 and the injector 2, the fuel pipe connecting the injector 2 and the high-pressure pump 9, and the fuel pipe connecting the components of the fuel supply device are also included in the present invention. Configure the fuel path.

  The ECU 3 includes a known microcomputer including a CPU, ROM, RAM, and the like (not shown), and performs arithmetic processing according to a program stored in the microcomputer. Various information such as a signal related to the fuel pressure in the common rail 1, the engine speed, and the accelerator opening is input to the ECU 3 as needed.

  The ECU 3 calculates the optimal injection timing and injection amount (injection period) according to the operating state of the engine and the vehicle, and controls the valve opening timing and valve opening period of each injector 2. In addition, the ECU 3 controls the fuel pressure in the common rail 1 by calculating a target discharge amount of the high-pressure pump 9 and outputting a control signal to the metering valve 8 to control the discharge amount of the high-pressure pump 9.

  FIG. 2 is a schematic cross-sectional view showing the configuration of the fuel filter 7. As shown in FIG. 2, the fuel filter 7 includes a hollow filter container 71 through which fuel flows, and a filter element that captures solid impurities in the fuel above the intermediate portion in the vertical direction in the filter container 71. 72 is arranged. In the space where the filter element 72 is disposed, that is, in the upper space of the filter container 71, fuel from which water has been separated is stored. Below the filter element 72 in the filter container 71, a sedimentor portion 73 is formed as a water reservoir for storing water separated from fuel.

  An ion exchanger 11 having ion exchange capacity is disposed in the cementer unit 73. And water is put into the cementer part 73 before vehicle mounting, and the ion exchanger 11 whole is submerged by arrange | positioning the ion exchanger 11 in the bottom part in the segmenter part 73. FIG. In addition, as the ion exchanger 11, an ion exchange resin, an ion exchange cellulose, an ion exchange fiber, etc. can be used.

  The filter container 71 is provided with a drain pipe 74 for discharging water accumulated in the cementer unit 73 to the outside. The upstream end portion of the drain pipe 74 is in communication with the digester portion 73 at a position above the upper surface of the ion exchanger 11. A drain plug (not shown) for opening and closing the drain pipe 74 is provided at the downstream end of the drain pipe 74.

  A fuel pipe 7 a that guides the fuel that has passed through the water separator 6 (see FIG. 1) to the fuel filter 7 is connected to the filter container 71. A downstream end portion of the fuel pipe 7 a is opened by a cementer portion 73. More specifically, the downstream end portion of the fuel pipe 7 a opens below the opening position of the upstream end portion of the drain pipe 74. The direction of the downstream end of the fuel pipe 7a is set so that the fuel flowing out from the fuel pipe 7a flows toward the ion exchanger 11.

  A fuel pipe 7b that guides the fuel that has passed through the fuel filter 7 to the metering valve 8 (see FIG. 1) is connected to the filter container 71. The upstream end of the fuel pipe 7 b is open to the upper end of the filter container 71.

  In the above configuration, the fuel guided to the fuel filter 7 by the fuel pipe 7 a first flows into the cementer unit 73. The moisture is separated from the fuel by the cementer unit 73, and the water is stored in the cementer unit 73. Further, the metal component in the fuel is adsorbed on the ion exchanger 11 by ion exchange, and the metal component in the fuel is removed. The fuel from which moisture and metal components have been removed is guided to the metering valve 8 by the fuel pipe 7 b after solid impurities are captured by the filter element 72.

  Here, since the entire ion exchanger 11 is submerged and water always exists around the ion exchanger 11, the fuel that has flowed from the fuel pipe 7 a into the cementer unit 73 is directed toward the ion exchanger 11. When flowing, it comes into contact with the water around the ion exchanger 11. For this reason, the metal component contained in the fuel elutes in the surrounding water and is reliably ionized. The ionized metal component is adsorbed on the ion exchanger 11 by ion exchange, thereby reliably removing the metal component in the fuel.

  Further, in the present embodiment, the upstream end portion of the drain pipe 74 communicates with the segmenter unit 73 at a position higher than the upper surface of the ion exchanger 11, so that the drain pipe 74 is opened and collected in the segmenter unit 73. When the water is discharged to the outside, the water surface in the cementer unit 73 does not fall below the upper surface of the ion exchanger 11, and the ion exchanger 11 is maintained in a submerged state. Therefore, water can always be present around the ion exchanger 11, and the metal component contained in the fuel can always be ionized reliably.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 3 is a schematic cross-sectional view showing the configuration of the water separator in the fuel injection system according to the second embodiment. In the first embodiment, the ion exchanger 11 is disposed in the fuel filter 7, but in the present embodiment, the ion exchanger 11 is disposed in the water separator 6. Since other aspects are the same as those in the first embodiment, only different parts will be described.

  As shown in FIG. 3, the water separator 6 includes a hollow water separator container 61 through which fuel flows, and a water reservoir part that stores water separated from the fuel on the bottom side in the water separator container 61. 62 is formed. The ion exchanger 11 is disposed in the water reservoir 62. The water reservoir 62 is filled with water before being mounted on the vehicle. By placing the ion exchanger 11 in the water reservoir 62 (that is, the bottom in the water separator container 61), the ion exchanger 11 is placed. The whole is submerged.

  The water separator container 61 is provided with a drain pipe 63 for discharging the accumulated water to the outside. The upstream end of the drain pipe 63 communicates with the water reservoir 62 at a position above the upper surface of the ion exchanger 11. A drain plug (not shown) for opening and closing the drain pipe 63 is provided at the downstream end of the drain pipe 63.

  Connected to the water separator container 61 is a fuel pipe 6 a that guides the fuel pumped from the feed pump 5 (see FIG. 1) to the water separator 6. The downstream end of the fuel pipe 6 a is opened below the opening position of the upstream end of the drain pipe 63. Further, the direction of the downstream end of the fuel pipe 6a is set so that the fuel flowing out from the fuel pipe 6a flows toward the ion exchanger 11.

  A fuel pipe 6b that guides the fuel that has passed through the water separator 6 to the fuel filter 7 (see FIG. 1) is connected to the water separator container 61. The upstream end of the fuel pipe 6 b is open to the upper end of the water separator container 61.

  In the above configuration, the water guided to the water separator 6 by the fuel pipe 6 a is separated from the water, and the water is stored on the lower side of the water separator container 61. Further, the metal component in the fuel is adsorbed on the ion exchanger 11 by ion exchange, and the metal component in the fuel is removed. The fuel from which moisture and metal components have been removed is guided to the fuel filter 7 through the fuel pipe 6b.

  Here, the entire ion exchanger 11 is submerged, and the fuel that has flowed into the water separator container 61 from the fuel pipe 6 a contacts the water around the ion exchanger 11 when flowing toward the ion exchanger 11. Therefore, the metal component in the fuel is surely removed as in the first embodiment.

  Further, in the present embodiment, the upstream end of the drain pipe 63 communicates with the water reservoir 62 at a position above the upper surface of the ion exchanger 11, so the drain pipe 63 is opened and the water separator container 61 is opened. When the water accumulated inside is discharged to the outside, the water surface in the water separator container 61 does not fall below the upper surface of the ion exchanger 11, and the ion exchanger 11 is maintained in a submerged state. Therefore, the metal component contained in the fuel can always be ionized reliably as in the first embodiment.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 4 is a schematic cross-sectional view showing the configuration of the main part of the fuel injection system according to the third embodiment. In the first embodiment, the ion exchanger 11 is arranged in the fuel filter 7, but in this embodiment, a dedicated container for arranging the ion exchanger 11 is provided. Since other aspects are the same as those in the first embodiment, only different parts will be described.

  As shown in FIG. 4, a first water reservoir 12 is disposed between the feed pump 5 and the water separator 6. The first water reservoir 12 includes a hollow first water reservoir container 121 through which fuel flows and stores water, and the first water reservoir 12 stores water on the bottom side in the first water reservoir container 121. A portion 122 is formed. The first water reservoir 122 is filled with water before being mounted on the vehicle.

  A fuel pipe 12 a that guides the fuel pumped from the feed pump 5 to the first water reservoir 12 is connected to the first water reservoir container 121. A fuel pipe 12 b that guides the fuel that has passed through the first water reservoir 12 to the water separator 6 is connected to the first water reservoir container 121. The upstream end portion of the fuel pipe 12 b is open to the upper end portion of the first water reservoir container 121.

  A second water reservoir 13 is disposed below the first water reservoir 12. The second water reservoir 13 includes a hollow second water reservoir container 131 that stores water therein, and a second water reservoir 132 that stores water is formed in the second water reservoir container 131. The second water reservoir 132 is filled with water before being mounted on the vehicle. Then, by arranging the ion exchanger 11 in the second water reservoir 132, the entire ion exchanger 11 is submerged.

  The intermediate portion in the vertical direction in the first water reservoir container 121 and the intermediate portion in the vertical direction in the second water reservoir container 131 are communicated by the first connecting pipe 123. Further, the bottom portion of the first water reservoir container 121 and the upper end portion of the second water reservoir container 131 are communicated with each other by a second connection pipe 124. The first water reservoir 12, the second water reservoir 13, the fuel pipes 12a and 12b, and the connecting pipes 123 and 124 constitute the fuel path of the present invention.

  The second water reservoir 13 is detachably attached to the first connection pipe 123 and the second connection pipe 124, so that the ion exchanger 11 can be easily exchanged together with the second water reservoir 13. it can.

  The downstream end of the fuel pipe 12a is located in the vicinity of the bottom of the first water reservoir container 121 and directly above the end of the second connecting pipe 124 on the first water reservoir container 121 side. Yes. Further, the downstream end of the fuel pipe 12a is opened upward, so that the fuel flowing out of the fuel pipe 12a flows upward.

  Since the downstream end portion of the fuel pipe 12a has such a configuration, the water in the second water reservoir portion 132 passes through the second connection pipe 124 due to the suction effect caused by the flow of the fuel flowing out from the fuel pipe 12a. As the water in the second water reservoir 132 is sucked out into the first water reservoir 122 and the water in the second water reservoir 132 is sucked out, the water in the first water reservoir 122 passes through the first connection pipe 123. It flows into the second water reservoir 132. That is, water circulates between the first water reservoir 122 and the second water reservoir 132.

  According to this embodiment, the metal component contained in the fuel led to the first water reservoir 12 by the fuel pipe 12a is eluted into the water in the first water reservoir 122 and is ionized reliably. Then, since water circulates between the first water reservoir 122 and the second water reservoir 132, the ionized metal component is ion-exchanged by ion exchange when flowing into the second water reservoir 132. The metal component in the fuel is reliably removed.

  Moreover, in this embodiment, since the 1st water reservoir 12 is arrange | positioned in the upstream of the water separator 6 and the fuel filter 7, even if water flows out from the 1st water reservoir 12, it is the water. Is separated by a water separator 6 or a fuel filter 7.

  In the present embodiment, the ion exchanger 11 is disposed in the second water reservoir 13, but the second water reservoir 13 is abolished, and the first water reservoir 12 disposed in the fuel path is the first. The ion exchanger 11 may be disposed in the water reservoir 122.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. FIG. 5 is a schematic cross-sectional view showing the configuration of the main part of the fuel injection system according to the fourth embodiment. In the first embodiment, the ion exchanger 11 is disposed in the fuel filter 7, but in the present embodiment, the ion exchanger 11 is disposed in the fuel tank 4. Since other aspects are the same as those in the first embodiment, only different parts will be described.

  As shown in FIG. 5, the bottom of the fuel tank 4 is provided with a water reservoir 41 that is recessed further downward than the surrounding bottom, and the ion exchanger 11 is disposed in the water reservoir 41. The water reservoir 41 is filled with water before being mounted on the vehicle, and by placing the ion exchanger 11 in the water reservoir 41, the entire ion exchanger 11 is submerged.

  The downstream end of the return fuel pipe 10 opens into the water reservoir 41. The direction of the downstream end of the return fuel pipe 10 is set so that the fuel flowing out from the return fuel pipe 10 flows toward the ion exchanger 11.

  According to the present embodiment, the entire ion exchanger 11 is submerged, and the fuel that flows into the water reservoir 41 from the return fuel pipe 10 flows around the ion exchanger 11 when flowing toward the ion exchanger 11. Since it contacts water, the metal component in the fuel is reliably removed as in the first embodiment.

  Further, since the fuel in the fuel tank 4 is always in contact with the water around the ion exchanger 11, the metal component in the fuel is ionized and the metal component in the fuel is removed even when the fuel is not flowing. .

(Fifth embodiment)
A fifth embodiment of the present invention will be described. FIG. 6 is a schematic cross-sectional view showing the configuration of the water separator in the fuel injection system according to the fifth embodiment.

  In this embodiment, as shown in FIG. 6, the magnet 14 is arrange | positioned in the water separator 6 in 2nd Embodiment. Since other aspects are the same as those of the second embodiment, only different portions will be described.

  More specifically, the magnet 14 is disposed on the outer periphery of the fuel pipe 6 a that guides the fuel to the water separator 6. In other words, the magnet 14 is disposed on the fuel flow upstream side of the ion exchanger 11. Then, since a magnetic field is formed around the magnet 14 and ionization of the metal component in the fuel is promoted when the fuel passes through the magnetic field, the metal component in the fuel is more reliably removed.

  In the present embodiment, the magnet 14 is disposed in the water separator 6, but the fuel in the fuel filter 7 in the first embodiment, the second water reservoir 13 in the third embodiment, or the fuel in the fourth embodiment. A magnet 14 may be disposed in the tank 4.

(Sixth embodiment)
A sixth embodiment of the present invention will be described. FIG. 7 is a schematic cross-sectional view showing the configuration of the water separator in the fuel injection system according to the sixth embodiment.

  In the present embodiment, as shown in FIG. 7, a water repellent sheet 64 is disposed in the water separator 6 in the second embodiment. Since other aspects are the same as those of the second embodiment, only different portions will be described.

  As shown in FIG. 7, the water separator container 61 is provided with a water repellent sheet 64 that allows fuel to pass therethrough and does not allow water to pass. As the water repellent sheet 64, a nonwoven fabric or mesh made of a material having water repellency (Teflon (registered trademark), PBT, PET, etc.) or a nonwoven fabric or mesh subjected to a water repellent treatment can be used.

  The water repellent sheet 64 is disposed above the opening position of the upstream end of the drain pipe 63, that is, above the position where the drain pipe 63 communicates with the water reservoir 62. The water repellent sheet 64 extends in the horizontal direction and divides the space in the water separator container 61 in the vertical direction.

  A fuel pipe 6 a that guides fuel pumped from the feed pump 5 (see FIG. 1) to the water separator 6 penetrates the water repellent sheet 64, and a downstream end of the fuel pipe 6 a is connected to the drain pipe 63. It opens below the opening position of the upstream end. Further, the upstream end portion of the fuel pipe 6 b that guides the fuel that has passed through the water separator 6 to the fuel filter 7 (see FIG. 1) is opened at a position higher than the water repellent sheet 64.

  According to the present embodiment, the water repellent sheet 64 that is impermeable to water can prevent the water accumulated in the water reservoir 62 from flowing out to the fuel filter 7 side, so that the state where water has accumulated in the water reservoir 62 is maintained. Easy to do. Therefore, the submerged state of the ion exchanger 11 is maintained, and the metal component contained in the fuel can always be ionized reliably.

It is a figure showing the whole fuel injection system composition concerning a 1st embodiment of the present invention. It is typical sectional drawing which shows the structure of the fuel filter 7 of FIG. It is typical sectional drawing which shows the structure of the water separator in the fuel-injection system which concerns on 2nd Embodiment of this invention. It is typical sectional drawing which shows the structure of the principal part in the fuel-injection system which concerns on 3rd Embodiment of this invention. It is typical sectional drawing which shows the structure of the principal part in the fuel-injection system which concerns on 4th Embodiment of this invention. It is typical sectional drawing which shows the structure of the water separator in the fuel-injection system which concerns on 5th Embodiment of this invention. It is typical sectional drawing which shows the structure of the water separator in the fuel-injection system which concerns on 6th Embodiment of this invention.

Explanation of symbols

4 Fuel Tank 11 Ion Exchanger 41 Reservoir 62 Reservoir 73 Reservoir 122 Reservoir 132 Reservoir

Claims (11)

A fuel injection system for increasing the pressure of fuel stored in a fuel tank (4) and injecting the fuel into an internal combustion engine,
A water reservoir (41, 62, 73, 122, 132) for storing water is provided in the fuel path through which the fuel flows, and an ion exchanger (11) that adsorbs metal ions by ion exchange includes the water reservoir (11). 41, 62, 73, 122, 132) are disposed in a submerged state. A fuel filter (7) having a filter container (71) through which fuel flows and a filter element (72) housed in the filter container (71) and capturing solid impurities in the fuel;
The fuel injection system according to claim 1, wherein the water reservoir (73) is formed below the filter element (72) in the filter container (71).   The fuel filter (7) includes a drain pipe (74) for discharging water accumulated in the water reservoir (73) to the outside, and the drain pipe (74) is connected to the ion exchanger (11). The fuel injection system according to claim 2, wherein the fuel injection system communicates with the water reservoir (73) at a position above the upper surface. A water separator (6) for separating water from the fuel circulating in the interior and storing the separated water and fuel in a water separator container (61);
The fuel injection system according to claim 1, wherein the water reservoir (62) is formed on a bottom side in the water separator container (61).   The water separator (6) includes a drain pipe (63) for discharging water accumulated in the water reservoir (62) to the outside, and the drain pipe (63) includes the ion exchanger (11). The fuel injection system according to claim 4, wherein the fuel injection system communicates with the water reservoir portion (62) at a position above the upper surface of the water reservoir.   The water separator (6) includes a water repellent sheet (64) that allows fuel to pass therethrough and does not allow water to pass through. The water repellent sheet (64) communicates with the water reservoir (62) through the drain pipe (63). The fuel injection system according to claim 5, wherein the fuel injection system is disposed above a position where the fuel injection is performed. A first water reservoir (12) having a first water reservoir container (121) for storing water therein is disposed in the fuel path;
A second water reservoir (13) having a second water reservoir container (131) forming the water reservoir (132) is disposed below the first water reservoir (12);
The fuel injection system according to claim 1, wherein water is circulated between the first water reservoir container (121) and the water reservoir (132).   The fuel injection system according to claim 1, wherein a water reservoir (12) having a water reservoir container (121) forming the water reservoir (122) is disposed in the fuel path. A fuel injection system for increasing the pressure of fuel stored in a fuel tank (4) and injecting the fuel into an internal combustion engine,
A water reservoir (41) for storing water is formed at the bottom of the fuel tank (4), and an ion exchanger (11) that adsorbs metal ions by ion exchange is submerged in the water reservoir (41). fuel injection system that is characterized in that it is arranged.   The fuel path includes a return fuel pipe (10) for returning a part of the fuel sent from the fuel tank (4) to the fuel tank (4), and fuel discharged from the return fuel pipe (10) 10. The fuel injection system according to claim 9, wherein the fuel injection system is configured to flow toward the ion exchanger (11).   The fuel injection system according to any one of claims 1 to 10, wherein a magnet (14) is disposed upstream of the ion exchanger (11) in the fuel flow.

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