JP2008180209A - Fuel filtering device and fuel supply device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently separate water in a fuel and suppress clogging in a fuel filtering process with water condensed. <P>SOLUTION: The fuel device 1 has a filter element 38 which includes a water repellent layer 35 formed by a first filtering material 35a capable of controlling permeation of water. The filtering element 38 includes a cohesive layer 33, formed by a second filtering material 33a different from the first filtering material 35a, for cohesion of water particles in the fuel, and a filtering layer 37 formed by a third filtering material 37a different from the first filtering material 35a and the second filtering material 33a, for capturing material particles. Of the filter element 38, the first filtering material 35a of the water repellent layer 35, the second filtering material 33a of the cohesive layer 33 and the third filtering material 37a of the filtering layer 37 are arranged so that the fuel guided to the filter element is filtered through the condensation layer 33, the water repellent layer 35 and the filter layer 37 in this order. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel filtration device and a fuel supply device using the same, and is suitable for application to a fuel filter that performs fuel filtration in a fuel supply device that supplies fuel to an internal combustion engine such as a diesel engine. is there.

  Conventionally, as a fuel filtering device, for example, in a fuel supply device that supplies fuel to a diesel engine, it is provided between a fuel tank and a fuel pump, and removes foreign matters such as dust and metal powder in the fuel, There is known a fuel filter having a filter element that separates water present in the fuel by, for example, settling water to the bottom using the specific gravity difference (Patent Document 1, etc.).

  Patent Document 2 discloses a technology that has a first filter element and a second filter element, and removes foreign matters and moisture from the fuel by filtering the fuel in the order of the first filter element and the second filter element. ing. In this technique, first, a filter layer capable of capturing foreign substances in the fuel and aggregating moisture from small particles to large particles is formed by the first filter element. Next, a water repellent layer that repels the aggregated water and removes it in the form of water droplets is formed by the second filter element.

In the technique disclosed in Patent Document 3, the filter element is formed of a water-repellent filter medium, and with this one filter element, water removal and trapping of foreign matters are simultaneously performed by aggregation and water repellency.
JP-T-2004-519618 JP-A-6-55010 JP-A-8-226358

  In the prior arts disclosed in Patent Documents 2 and 3, since the filter element has a water-repellent function, water is settled to the bottom of the fuel filter using only the specific gravity difference between the fuel and water. Separation performance can be improved. However, in the water aggregation process of the first element, there is a possibility that the aggregated water accumulates in the element. When water accumulates in the element, the area in which the element has accumulated water becomes clogged, which may increase the pressure loss for filtering the fuel. That is, the pressure (negative pressure) at which the fuel pump sucks fuel from the fuel tank through the fuel filter may increase.

  The present invention has been made in view of such circumstances, and enables moisture in the fuel to be separated with high efficiency and suppresses clogging caused by water aggregated in the fuel filtration process. With the goal.

  Another object is to be able to separate the water in the fuel with high efficiency and to prevent clogging with water aggregated during the fuel filtration process, and to ensure that the repelled water is stored at the bottom. And a fuel supply device using the same.

    In order to achieve the above object, the present invention comprises the following technical means.

That is, in the invention according to any one of claims 1 to 7, in the fuel filter device including the filter element having the water repellent layer formed of the first filter medium capable of preventing water from entering, the filter element includes the water repellent layer. Formed by a second filter medium different from the first filter medium to be formed, and formed by a third filter medium different from the first filter medium and the second filter medium forming the water repellent layer, and an aggregate layer for aggregating water particles in the fuel; And a filtration layer for capturing
Among the filter elements, the first filter medium of the water-repellent layer, the second filter medium of the aggregate layer, and the third filter medium of the filter layer pass the fuel guided to the filter element in the order of the aggregate layer, the water-repellent layer, and the filter layer. It is arrange | positioned so that it may filter by.

  According to this, the filter element for filtering the fuel is a filtration layer that aggregates the water particles in the fuel, a water repellent layer that repels the water aggregated in the aggregation layer, and a filter that traps the material particles in the fuel flow direction. Arranged in order of layers. This prevents water particles from being repelled by the water-repellent layer disposed upstream of the filtration layer and prevents the water particles from flowing downstream, thus preventing an increase in pressure loss due to water particle adhesion to the filtration layer. Is possible. Further, an agglomerated layer that aggregates the water particles is disposed on the upstream side of the water repellent layer that prevents the water particles from flowing downstream from the first filter medium that forms the water repellent layer. Therefore, before repelling the water particles and preventing outflow to the downstream side, the water particles are enlarged or grouped in advance. Since it is possible to reliably prevent water particles from flowing out of the water repellent layer, there is no increase in pressure loss due to water particle adhesion to the filtration layer.

  Therefore, water in the fuel can be separated with high efficiency, and clogging can be prevented from occurring due to the water aggregated in the fuel filtration process.

  In addition, the first filter medium of the water repellent layer, the second filter medium of the aggregation layer, and the third filter medium of the filter layer are respectively the first pore diameter, It is preferable that the first and second pore diameters of the water-repellent layer> the second pore diameter of the aggregated layer> the third pore diameter of the filtration layer.

  According to this, the agglomerated layer and the water repellent layer that are disposed upstream of the filtration layer that captures the substance particles such as foreign substances and aggregate and repel water different from the substance particle capturing function are larger than the third pore diameter of the filtration layer. Since the first hole diameter and the second hole diameter are formed, clogging of the aggregated layer and the water-repellent layer itself is suppressed by substance particles such as foreign matters. In addition, since the water repellent layer is obtained by agglomeration layer in which water particles are previously enlarged or grouped, even if it is a liquid (water) different from the substance particles, the water that has been enlarged or grouped by particles Can be repelled by a water repellent layer having a third hole diameter larger than the third hole diameter of the filtration layer and the second hole diameter of the agglomerated layer, thereby preventing outflow to the downstream side.

  Further, as in the invention described in claim 3, it is preferable that the water repellent layer is formed from a first filter medium having hydrophobicity, and the aggregation layer is formed from a second filter medium having hydrophilicity.

  According to this, the second filter medium of the aggregation layer has an affinity for water, and the first filter medium of the water repellent layer has no water affinity and has a water repellency. Thereby, the water particles in the fuel are effectively aggregated by utilizing the material characteristics of the second filter medium of the aggregation layer, and the aggregated water particles are effectively utilized by utilizing the material characteristics of the first filter medium of the water repellent layer. Can be repelled (water repellent). That is, out of the fuel that reaches the second filter medium having an affinity for water, water particles in the fuel adhering to the filter medium surface can be aggregated using the filter medium surface. Furthermore, only the agglomerated water particles of the fuel that reaches the first filter medium can be repelled using the filter medium surface to prevent water from entering the downstream side.

  In addition, the first filter medium of the water repellent layer, the second filter medium of the aggregate layer, and the third filter medium of the filter layer are formed on the inner side of the third filter medium of the filter layer. It is preferable that the second filter medium is disposed and the first filter medium of the water repellent layer is disposed below the third filter medium of the filter layer.

  According to this, the fuel led to the filter element can aggregate water particles in the fuel in the aggregation layer inside the filtration layer. Since the aggregated water particles move toward the downstream side below, they are increased in size or grouped without stagnation in the aggregated layer.

  Then, the fuel that moves downward together with the water particles does not flow into the filtration layer from the inside of the filtration layer, but moves along the path through the water repellent layer from the lower end side of the filtration layer. That is, before the fuel and the water particles reach the filtration layer, only the water particles are repelled by the water repellent layer, and fuel other than the water particles reaches the filtration layer. Moreover, the water particles repelled by the water repellent layer before reaching the lower end side of the filtration layer fall downward without adhering to the water repellent layer.

  As a result, water in the fuel is repelled by the water repellent layer and effectively settles below the filter element, and fuel other than water is filtered from below to above in the filter layer. The water content therein is separated with high efficiency, and the water particles aggregated during the filtration process of the filtration layer are not clogged.

  In addition, the first filter medium of the water repellent layer, the second filter medium of the aggregated layer, and the third filter medium of the filter layer are arranged on the outside of the third filter medium of the filter layer as in the invention described in claim 5. It is preferable that the first filter medium is disposed, and the second filter medium of the aggregation layer is disposed outside the first filter medium of the water repellent layer.

  According to this, the third filter medium of the filtration layer and the second filter medium of the aggregation layer are arranged inside and outside the first filter medium of the water repellent layer. As a result, when the fuel and the water particles move from the outside to the inside between the first filter medium of the water repellent layer and the second filter medium of the agglomerated layer, the water particles having a specific gravity larger than that of the fuel are settled downward. It is possible to make it. In addition, since the water repellent layer is opposed to the fuel flowing from the outside to the inside and the water particles, at least a part of the water particles is formed in the water repellent layer in the process in which the water particles settle downward. Even if it reaches, a part of the water repellent layer is repelled by the water repellent layer, and is surely settled downward along the outside of the water repellent layer.

  Moreover, it is preferable that a gap forming member is provided between the second filter medium of the aggregated layer and the first filter medium of the water repellent layer, as in the invention described in claims 6 to 7.

  As a result, a gap is reliably formed by the gap forming member between the second filter medium of the aggregated layer and the first filter medium of the water repellent layer. When moving, the water particles can be easily settled downward.

  Further, as in the invention described in claim 7, the gap forming member includes a guide member for supporting at least one of the first filter medium and the second filter medium along one outer shape, and a guide toward the other. It is preferable to have a fluid passage forming partition extending from the member.

  According to this, in the gap forming member, on the side where the fluid passage forming partition extends from the guide member, a fluid passage through which the fuel and the water particles can flow is formed in a region excluding the partition. Thereby, for example, the water particles having a specific gravity greater than that of the fuel can be further settled downward.

Further, as in the invention described in claims 8 to 10, the water repellent layer is formed of a first filter medium capable of preventing water from entering, and the third filter medium is different from the first filter medium forming the water repellent layer. In a fuel filtration device comprising a filter element having a filtration layer for capturing substance particles,
Among the filter elements, the first filter medium of the water repellent layer and the third filter medium of the filter layer are disposed so as to filter the fuel guided to the filter element in the order of the water repellent layer and the filter layer. It is characterized by that.

  According to this, since the filter element for filtering the fuel is arranged in the order of the water repellent layer and the filter layer in the fuel flow direction, the water particles in the fuel are repelled by the water repellent layer. Water particles are prevented from flowing into the filtration layer arranged downstream of the layer. Therefore, with a simple structure in which a water repellent layer is provided upstream of the filtration layer, an increase in cost can be suppressed and an increase in pressure loss due to adhesion of water particles to the filtration layer can be prevented.

  Further, as in the invention described in claim 9, the filter element includes an ion exchange resin layer formed of an ion exchange resin that captures metal ions, and the ion exchange resin layer is a fuel guided to the filter element. It is preferable to be disposed upstream or downstream of the water repellent layer.

  As a result, the fuel supplied to the filter element has water particles in the fuel repelled by the water repellent layer and the ion exchange resin layer, and metal ions in the fuel are captured. The outflow of particles and metal ions is prevented.

  Moreover, since metal ions are more likely to be present in aqueous solution than oil (non-aqueous solution) such as fuel, by removing water particles and metal ions in the fuel with a water repellent layer and an ion exchange resin layer, Outflow of metal ions is reliably prevented downstream of the water repellent layer and the ion exchange resin layer.

The water repellent layer and the filtration layer have a honeycomb structure formed by bonding the first filter medium and the third filter medium as in the invention of claim 10,
The honeycomb structure is formed by laminating the first filter medium and the third filter medium, and includes a partition wall having a plurality of cells penetrating in the axial direction, and a blockage that blocks a cell end portion of some of the plurality of cells. And a member.

  In such an invention, the fuel supplied to the filter element flows into the cells of the honeycomb structure, but the end of the cell is closed, so that the fuel is filtered by the partition walls defining the cells. In addition, since the first filter medium and the third filter medium are bonded together so that the partition wall is arranged in the order of the water-repellent layer and the filter layer with respect to the fuel flow direction, the plurality of cells of the honeycomb structure are partitioned. The fuel filtration area can be effectively earned by using the partition walls.

  Therefore, when a structure in which a water-repellent layer is provided upstream of the filtration layer is applied to the filter element, such a honeycomb structure can suppress an increase in the size of the filter element and also due to water particle adhesion to the filtration layer. An increase in pressure loss can be prevented.

  Further, the fuel filtration device according to any one of claims 1 to 10 is applied to a fuel supply device disposed between a fuel tank and a fuel injection pump as in claims 11 to 12. Is preferred. This is because it is possible to prevent fuel mixed with water from being supplied to the fuel injection pump that sucks up the fuel in the fuel tank.

  The fuel supply device is used in a fuel injection device that injects and supplies fuel to an internal combustion engine as in the invention described in claim 12, and accumulates and accumulates high-pressure fuel discharged from a fuel injection pump. It is preferable to provide a common rail that supplies high-pressure fuel to the fuel injection device. This prevents the supply of water particles or emulsion water contained in the fuel in the fuel tank to the fuel injection pump that generates high-pressure fuel, the common rail that uses the high-pressure fuel, and the fuel injection device. Can do.

  Hereinafter, embodiments in which the fuel filtration device of the present invention is applied to a fuel supply device used in an accumulator fuel injection device will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic cross-sectional view showing the fuel filtration device of the present embodiment. FIG. 2 is a schematic configuration diagram showing a fuel supply device to which the fuel filtration device of this embodiment is applied. FIG. 3 is a schematic diagram illustrating the configuration of each layer in the filter element in FIG.

  As shown in FIG. 2, the accumulator type fuel injection device includes a common rail 5 as an accumulator for accumulating high pressure fuel corresponding to a fuel injection pressure (hereinafter, common rail pressure), and a cylinder of a diesel engine (hereinafter, engine) 8. The cylinder is provided with a fuel injection valve 6 that injects and supplies high-pressure fuel distributed from the common rail 5 to the cylinder, and an ECU 90 that serves as a control means for driving and controlling the fuel supply valve 1.

  In FIG. 2, for example, one cylinder of a four-cylinder engine 8 and the fuel injection valve 6 mounted thereon are shown as an example. Further, in the common rail 5, the fuel supply path to the fuel injection valves of other cylinders to which the high pressure fuel is distributed in addition to the fuel injection valves is not shown.

  The ECU 90 is a microcomputer having a well-known structure, determines the optimal injection timing and injection amount (injection period) according to the engine state, and drives each fuel injection valve 6. Further, the ECU 90 determines the fuel discharge amount to be sent to the common rail 5 based on a detection signal from a pressure sensor 51 as a pressure detecting means provided on the common rail 5. Further, the ECU 90 controls the fuel pressure discharged from the fuel injection pump 4, that is, the common rail pressure, by driving the fuel injection pump 4 by outputting a control signal based on the determined fuel discharge amount.

  The high pressure fuel accumulated in the common rail 5 is supplied from the fuel supply device 1 including the fuel injection pump 4 via the high pressure fuel pipe 52. The high-pressure fuel accumulated in the common rail 5 is supplied to the fuel injection valve 6 via the high-pressure fuel pipe 53. Further, surplus fuel out of the high pressure fuel discharged by the fuel injection pump 4 and supplied to the common rail 5 and the fuel injection valve 6 is returned to the fuel tank 2 of the low pressure fuel piping system via the fuel recovery piping 791 and the like.

  In addition, although the fuel tank 2 shown in FIG. 2 is comprised separately from the 1st fuel tank 2a and the 2nd fuel tank 2b for convenience, it can also be comprised by one fuel tank.

  As shown in FIG. 2, the fuel injection valve 6 includes a nozzle portion 60 having a nozzle hole 611 for injecting fuel and a nozzle needle 69 for opening and closing the nozzle hole 611, a control piston 72, and a pressure control chamber 73. The holder main body 70 that urges the nozzle needle 69 via the control piston 72 with the fuel pressure (back pressure) increased or decreased in the pressure control chamber 73 as a pressing force for driving the nozzle needle 69; And an electromagnetic valve 79 for increasing and decreasing the fuel pressure in the pressure control chamber 73.

  In FIG. 2, the nozzle portion 60 and the holder main body 70 are configured to accommodate portions other than the tip portion of the nozzle portion 60 in the holder main body 70 for convenience, but the nozzle body 61 of the nozzle portion 60 and the holder main body 70 The structure of fixing both the upper end surface of the nozzle body 61 and the lower end surface of the nozzle holder 75 opposed thereto airtightly by fastening the 70 nozzle holders 75 with a retaining nut (not shown) as a fastening member. It can also be.

  The nozzle unit 60 includes the nozzle needle 69 and a nozzle body 61 that accommodates the nozzle needle 69 so as to be movable in the axial direction.

  The nozzle body 61 is formed in a substantially cylindrical body, and has one or a plurality of injection holes 611 for injecting high-pressure fuel into the combustion chamber of the engine 8 on the tip end (lower end in FIG. 2) side. I have one.

  Further, the nozzle body 61 has a guide hole 62 and a fuel reservoir chamber 67 and an abutting portion 69a of the nozzle needle 69 that are separated from and seated on the inside of the guide hole 62 toward the downstream of the fuel flow. A nozzle hole 12 b penetrating the inside and outside of the valve seat 66 and the nozzle body 61 is provided. Furthermore, the nozzle body 61 is provided with a fuel delivery path 68 that extends from the mating surface of the nozzle body 61 on the upper end side in the figure to the fuel reservoir chamber 67. The fuel delivery path 68 communicates with the fuel supply path 71 of the nozzle holder 75, thereby feeding the high-pressure fuel accumulated in the common rail 5 to the valve seat 66 side via the fuel reservoir chamber 67. The fuel delivery path 68, the first fuel supply path 71, and the second fuel supply path 74 constitute a high-pressure fuel path. The second fuel supply path 74 is formed in the nozzle holder 75 and is branched from the first fuel supply path 71 to supply the high-pressure fuel to the pressure control chamber 73.

  As shown in FIG. 2, the nozzle holder 75 is formed in a substantially cylindrical body, and an accommodation hole 725 for accommodating the spring 76 and the control piston 72 so as to be movable in the axial direction is provided therein. . A spring chamber forming hole 725b that is larger than the second guide hole 725a that allows the control piston 72 to slide is formed on the mating surface on the lower end side of the accommodation hole 725 in the figure. By sandwiching the spring 76 between the upper end surface of the spring chamber forming hole 725b and the spring receiving portion 72a, the spring 76 biases the nozzle needle 69 in the valve seat seating direction.

  The pressure control chamber 73 is partitioned by a guide hole 725 a and a control piston 72. A sliding gap between the control piston 72 and the second guide hole 725a (hereinafter referred to as a first sliding gap), and a sliding gap between the guide hole 62 of the nozzle body 61 and the nozzle needle 69 (hereinafter referred to as a second sliding hole). Dynamic gap) and a sliding gap (hereinafter referred to as a third sliding gap) between a plunger 45 and a cylinder (sliding hole) 44 in the fuel injection pump 4 described later constitute a high-pressure sliding gap through which high-pressure fuel is guided. ing.

  The electromagnetic valve 79 includes a coil (not shown) that generates an electromagnetic force by supplying electric power from the outside, a movable core (not shown) that cooperates with the valve body, and magnetically attracts the valve body and the movable core by the action of the electromagnetic force. A solenoid valve having a well-known structure having a fixed core (not shown) that increases or decreases the fuel pressure (back pressure) in the pressure control chamber 73. Specifically, an orifice member 755 is provided between the electromagnetic valve 79 and the control piston 72, and the pressure control chamber 73 is defined by the orifice member 755, the control piston 72, and the second guide hole 725a. . A second valve seat (not shown) on which a valve body cooperating with the movable core is seated and separated is formed on the end surface of the orifice member on the movable core side.

  Next, the fuel supply apparatus 1 will be described with reference to FIG. The fuel supply device 1 includes a fuel injection pump 4 having a low-pressure supply pump 42 as a preliminary pumping unit and a high-pressure pump 43 as a pressurizing unit, an inlet of the fuel injection pump 4 (specifically, the low-pressure supply pump 42), and a fuel tank 2. And a fuel filtering device 3 provided between the two. In FIG. 2, for convenience, the low-pressure supply pump 42 and the high-pressure pump 43 are separately configured, but the low-pressure supply pump 42 and the high-pressure pump 43 may be integrated.

  As shown in FIG. 2, the fuel injection pump 4 includes a low pressure supply pump 42, a high pressure pump 43, and a drive shaft 41 that drives the low pressure supply pump 42 and the high pressure pump 43 with the rotational force of the engine as a drive source. A cam chamber 43c in which a part of the feed fuel discharged from the low-pressure supply pump 42 is decompressed and supplied, and a housing 43a for housing these.

  The drive shaft 41 is rotatably supported by the housing 43a via a bearing. The cam 41a having a circular cross section is formed integrally with the drive shaft 41 in an eccentric manner. A pulley or gear (gear in the present embodiment) (not shown) is attached to one end of both ends (not shown) of the drive shaft 41, and the engine is transmitted via a transmission force transmission member such as a gear or a timing belt. It is comprised so that it may rotate in synchronization with the crankshaft. The configuration is not limited to the configuration in which the rotational force of the engine is transmitted between the gears, and the configuration in which the rotational force of the engine is transmitted by a pulley and a timing belt may be used.

  The other end of the drive shaft 41 also serves as the drive shaft of the low-pressure supply pump 42 so that the low-pressure supply pump 42 can be driven integrally. The other end portion of the drive shaft 41 is not limited to the configuration that also serves as the drive shaft of the low-pressure supply pump 42, and can be configured to be connected to the drive shaft of the low-pressure supply pump 42.

  The low pressure supply pump 42 has an inner gear and an outer gear (not shown), and an inner gear type pump that drives the inner gear by the rotation of the drive shaft 41 is used. The low-pressure supply pump 42 is not limited to the inner gear type pump, but may be any pump structure such as a vane type pump.

  The high-pressure pump 43 includes a cam 41 a, a plurality of (for example, three in this embodiment) plungers 45, and a pressurizing chamber 46 disposed to face the plunger 45, and is fed from the low-pressure supply pump 42. Pump fuel to high pressure. The high-pressure pump 43 is supplied with fuel for the plunger 45 by the low-pressure supply pump 42 through the intake metering valve 48 and is supplied to the cam chamber 43c as fuel for lubrication. . The cam chamber 43c is supplied with decompressed feed fuel through a second feed fuel passage (not shown) branched from the feed fuel passage 425. In FIG. 2, only one plunger 45 is shown, and the other plungers 45 are not shown.

  The intake metering valve 48 is an electromagnetic valve that meteres the amount of fuel supplied to the pressurizing chamber 46 in accordance with the operating state of the engine.

  The plungers 45 are arranged at equal intervals of 120 ° with the drive shaft 41 interposed therebetween. The plunger 45 can reciprocate in a sliding hole (also referred to as a cylinder) 44 of the housing 43a, and a pressurizing chamber 46 is provided on one end surface (upper end surface in the drawing) of the plunger 45. The end surface (the lower end surface in the drawing) is in contact with the cam 41a through a shoe or the like (not shown), and reciprocates in the sliding hole 44 by the rotation of the cam 41a. In FIG. 2, the shoe is not provided. However, the shoe may have a shoe, and the plunger 45 and the cam 41a may contact each other through the shoe. In this case, for example, the shoe can revolve without rotating with the rotation of the cam 41a, and the outer peripheral surface of the shoe facing the plunger 45 is formed in a flat shape.

  A discharge valve 49 is provided on the discharge side of the pressurizing chamber 46. The discharge valve 49 prevents backflow into the pressurizing chamber 46.

  Next, the fuel filtration device 3 will be described with reference to FIGS. 1 and 3. As shown in FIG. 1, the fuel filtering device 3 includes a priming pump 31 as a fuel pumping means, a cementer 34 as a water collecting chamber, and a filter element 38. The priming pump 31, the sedimentor 34, and the filter element 38 are accommodated in a housing 39. The priming pump 31 is provided in the upper housing 39b of the housing 39, and the sedimentor 34 and the filter element 38 are provided in the lower housing 39a. Contained. The upper housing 39b is made of resin or metal (in this embodiment, metal), and the lower housing 39a is made of metal.

  The priming pump 31 is provided with a diaphragm 311 and a knob 312 for swinging the diaphragm 311 in the vertical direction. By grasping the knob 312 and swinging it manually, the fuel in the suction port 313 is discharged. This is a manual pumping pump having a known structure for pumping to the port 314.

  The fuel flow path 32 for the fuel flowing in the fuel filtering device 3 is an introduction pipe 321 through which fuel guided from the fuel tank 2 is introduced in order toward the fuel downstream side, an intake port 313, an exhaust port 314, a first internal The outlet passage 322, the inner inlet passage 323, the second inner outlet passage 328, and the outlet pipe 329 from which fuel to the fuel injection pump 4 is led out. The introduction pipe 321 and the outlet pipe 329 are pipe members and are attached to the upper housing 39b. The suction port 313, the discharge port 314, and the first internal outlet passage 322 are inner walls formed in the upper housing 39b. The inner inlet passage 323 and the second inner outlet passage 328 are made of the inner wall of the lower housing 39a, the inner inlet passage 323 is a cylindrical partition wall, and the second inner outlet passage 328 is a continuous passage through the upper lid of the lower housing 39a. It is a passage.

  The internal inlet passage 323 has a lower support member (also referred to as an end plate) 39c and an upper support member (also referred to as a cover) 39d, and the lower opening end of the internal inlet passage 323 is supported by the lower support member 39c. The upper opening end of the internal inlet passage 323 is supported by the upper support member 39d. The lower support member 39c is formed in the shape of a ring with a metal such as a spring material, and the outer peripheral edge of the lower support member 39c is locked to the side wall of the lower housing 39a. The upper support member 39d is formed of a metal or a resin material in an annular plate shape, and the outer peripheral edge portion of the upper support member 39d is fitted and fixed to the side wall side of the opening edge portion of the lower housing 39a.

  The internal inlet passage 323 is accommodated coaxially in the lower housing 39a. The internal inlet passage 323 and the first internal outlet passage 322 are arranged coaxially with the upper support member 39d interposed therebetween. Each of the upper support member 39d and the lower support member 39c has a plurality of openings (not shown) penetrating inward and outward in the circumferential direction so that the fuel flowing through the fuel flow path 32 can flow.

  As shown in FIG. 1 and FIG. 3, the filter element 38 is formed of the aggregation layer 33 formed of the second filter medium 33a, the water repellent layer 35 formed of the first filter medium 35a, and the third filter medium 37a. And a filtration layer 37. The filter element 38 is disposed in the order of the aggregation layer 33, the water repellent layer 35, and the filtration layer 37 toward the fuel downstream side.

  Specifically, the aggregated layer 33 is disposed on the inner wall of the internal inlet passage 323. The water repellent layer 35 and the filtration layer 37 are disposed between the outer side of the inner wall of the internal inlet passage 323 and the side wall of the lower housing 39a in a state where the upper end surface of the water repellent layer 35 and the lower end surface of the filtration layer 37 face each other. It is installed. That is, the water repellent layer 35 and the filtration layer 37 are formed in a region (accommodating space) defined by the side wall of the lower housing 39a, the outside of the inner wall of the internal inlet passage 323, the upper support member 39d, and the lower support member 39c. It is accommodated and supported by a lower support member (end plate) 39c.

  The first filter medium 35a of the water repellent layer 35, the second filter medium 33a of the agglomerated layer 33, and the third filter medium 37a of the filter layer 37 are formed of filter paper or non-woven fabric, and have a pore diameter 33b capable of capturing material particles in the fuel. , 35b and 37b are different. That is, as shown in FIG. 3, the first hole diameter 35b of the water repellent layer 35, the second hole diameter 33b of the aggregation layer 33, and the third hole diameter 37b of the filtration layer 37 are in order of increasing hole diameter, the first hole diameter 35b, It is set so as to satisfy the relationship between the second hole diameter 33b and the third hole diameter 37b (first hole diameter 35b> second hole diameter 33b> third hole diameter 37b).

  The aggregation layer 33 of the second filter medium 33a aggregates water in the fuel from relatively small water particles into large water particle groups or large water particles as a whole. Further, the water repellent layer 35 of the first filter medium 35a has a water repellent effect of repelling water particles, and the aggregated large water particles or water particle groups are placed on the front surface of the first filter medium 35a (hereinafter also referred to as the lower end surface). 35d) to prevent water particles from flowing out to the fuel downstream side of the rear surface (hereinafter also referred to as the upper end surface) 35u. The filter layer 37 of the third filter medium 37a captures material particles such as foreign matters in the fuel, and is used for the fuel injection pump 4 of the fuel supply device 1 and the fuel injection valve 6 of the fuel injection device on the downstream side of the fuel. Prevents foreign matter from adhering to, accumulating, or biting into each high-pressure sliding gap.

  Moreover, it is preferable that the water repellent layer 35 is formed from the 1st filter medium 35a which has hydrophobicity, and the aggregation layer 33 is formed from the 2nd filter medium 33a which has hydrophilicity. According to this, the second filter medium 33a of the aggregation layer 33 has an affinity for water, and the first filter medium 35a of the water repellent layer 35 has an affinity for water and has a water repellency.

  Thereby, water particles in the fuel are effectively aggregated using the material characteristics of the second filter medium 33a of the aggregation layer 33, and water aggregated using the material characteristics of the first filter medium 35a of the water repellent layer 35 is aggregated. The particles can be effectively repelled (water repellent). That is, among the fuel that reaches the second filter medium 33a having an affinity for water, the water particles in the fuel adhering to the filter medium surface can be aggregated using the filter medium surface. Furthermore, only the agglomerated water particles of the fuel reaching the first filter medium 35a can be repelled using the filter medium surface to prevent water from entering the downstream side.

  Moreover, it is preferable that the water repellent layer 35, the aggregation layer 33, and the filtration layer 37 are arrange | positioned as follows. That is, as shown in FIG. 1, the second filter medium 33 a of the aggregation layer 33 is disposed inside the third filter medium 37 a of the filter layer 37, and the water repellent layer 35 is disposed below the third filter medium 37 of the filter layer 37. The first filter medium 35a is preferably disposed.

  According to this, the fuel guided to the filter element 38 is capable of aggregating water particles in the fuel in the agglomeration layer 33 inside the filtration layer 37. Since the aggregated water particles move toward the lower downstream side, they are increased in size or grouped without stagnation in the aggregation layer 33.

  Then, the fuel that moves downward together with the water particles does not flow into the filtration layer 37 from the inside of the filtration layer 37, but moves along a path flowing from the lower end side of the filtration layer 37 through the water repellent layer 35. . That is, before the fuel and the water particles reach the filtration layer 37, only the water particles are repelled by the water repellent layer 35, and fuel other than the water particles reaches the filtration layer 37. In addition, the water particles repelled by the water repellent layer 35 before reaching the lower end side of the filtration layer 37 fall downward without adhering to the water repellent layer 35.

  As a result, water in the fuel is repelled by the water repellent layer 35 and effectively settles below the filter element 38, and fuel other than water is filtered from below to above in the filter layer 37. Therefore, water in the fuel is separated with high efficiency, and clogging does not occur due to water particles aggregated in the filtration process of the filter layer 37.

  The cementer (water collecting portion) 34 includes a water surface sensor 341 and a drain cock 342.

  The water repellent layer 35 and the filtration layer 37 are not limited to those in which the upper end surface 35u of the water repellent layer 35 and the lower end surface of the filtration layer 37 are in contact with each other, as shown in FIG. And the lower end surface of the filtration layer 37 can also be set as the structure which is simply arrange | positioned facing each other.

  In FIG. 2, the sensors connected to the ECU 90 include the pressure sensor 51 of the common rail 5, the fuel temperature sensor 91 for detecting the fuel temperature of the fuel supply device 1, etc., the crank angle sensor 94, the cam angle sensor 95, And an accelerator opening sensor 96 or the like. Here, the crank angle sensor 94 is composed of an electromagnetic pickup coil (not shown) or the like disposed opposite to a magnetic timing rotor (signal rotor) 81 fixed to the crankshaft of the internal combustion engine 8. This is an angle detection sensor having a known structure. The timing rotor 81 is formed with a plurality of convex teeth for each predetermined angle (for example, 10 ° crank angle). The cam angle sensor 95 is composed of an electromagnetic pickup coil (not shown) or the like disposed opposite to a magnetic timing rotor (signal rotor) 82 fixed to the cam shaft of the internal combustion engine 8. This is an angle detection sensor having a known structure. The accelerator opening sensor 96 measures the amount of depression of the accelerator pedal (also referred to as accelerator operation amount or accelerator opening). Actuators connected to the ECU 90 include an electromagnetic valve 79 of the fuel injection valve 6, an intake metering valve 48 of the fuel injection pump 4, an actuator 92 that drives a throttle valve (not shown), and an exhaust gas recirculation amount (EGR amount). It is composed of an actuator 93 of each control member such as an EGR valve (not shown) for adjusting the pressure.

  Here, in the fuel supply device 1, the first sliding gap between the plunger 45 and the sliding hole 44 of the fuel injection pump 4 constitutes a high-pressure sliding gap through which high-pressure fuel is guided. Further, in the fuel injection valve 6 of the fuel injection device, a second sliding gap between the guide hole 62 of the nozzle body 61 and the nozzle needle 69 and a third slide between the control piston 72 and the second guide hole 725a are provided. The moving gap constitutes a high-pressure sliding gap.

  In the present embodiment described above, the filter element 38 includes the agglomerated layer 33 that aggregates water particles in the fuel toward the downstream side of the fuel, the water-repellent layer 35 that repels the water aggregated in the agglomerated layer 33, and foreign matters. The filter layers 37 for capturing the material particles are arranged in this order.

  As a result, water particles are repelled by the water repellent layer 35 disposed upstream of the filtration layer 37, and the water particles are prevented from flowing downstream, so that an increase in pressure loss due to adhesion of water particles to the filtration layer 37 is prevented. Can be prevented. In addition, the agglomerated layer 37 is formed of a second filter medium 37a different from the first filter medium 35a that forms the water repellent layer 35 on the upstream side of the water repellent layer 35 that prevents the water particles from flowing downstream, and aggregates the water particles. Therefore, the water-repellent layer 35 can be reliably prevented from flowing out. This is because the water particles have been enlarged or grouped in advance before repelling the water particles to prevent the downstream flow.

  Therefore, the water repellent layer 35 can be surely prevented from flowing out of water particles, so that the pressure loss due to the water particles adhering to the filtration layer 37 does not occur. The fuel filtration device 3 of the present embodiment can separate water in the fuel with high efficiency and can suppress clogging with water aggregated in the fuel filtration process.

  Further, in the present embodiment described above, the first filter medium 35a of the water repellent layer 35, the second filter medium 33a of the aggregation layer 33, and the third filter medium 37a of the filter layer 37 contain the material particles in the fuel as follows. It is preferable that the filter mediums have different pore diameters that can be captured. That is, the first hole diameter 35b of the water repellent layer 35, the second hole diameter 33b of the aggregation layer 33, and the third hole diameter 37b of the filtration layer 37 satisfy the first hole diameter 35b> the second hole diameter 33b> the third hole diameter 37b. Is set to

  According to this, the agglomerated layer 33 and the water repellent layer 35 are formed with the second hole diameter 33b and the first hole diameter 35b larger than the third hole diameter 37b of the filtration layer 37. Occurrence of clogging of the water repellent layer 35 itself is suppressed. In addition, since the water repellent layer 35 is obtained by preliminarily agglomerating or grouping water particles in the aggregation layer 33, even if the liquid (water) is different from the material particles, the water repellent layer 35 is made large or particle grouped. Water is repelled by the water repellent layer 35 having the first hole diameter 35b larger than the third hole diameter 37b of the filtration layer 37 and the second hole diameter 33b of the aggregation layer 33, and is prevented from flowing out to the downstream side. Can do.

  Further, in the present embodiment described above, the fuel filtration device 3 including the filter element 38 including the aggregation layer 33, the water repellent layer 35, and the filtration layer 37 is provided between the fuel tank 2 and the fuel injection pump 4. It is suitable to be applied to the fuel supply device 1 disposed between them. This is because it is possible to prevent the fuel mixed with water from being supplied to the fuel injection pump 4 that sucks up the fuel in the fuel tank 2.

  The fuel supply device 1 is used in a fuel injection device that injects and supplies fuel to the engine 8. The fuel supply device 1 accumulates high-pressure fuel discharged from the fuel injection pump 4, and stores the accumulated high-pressure fuel in the fuel injection valve 6. It is preferable that a common rail 5 to be supplied is provided. Thus, water particles or emulsion water contained in the fuel in the fuel tank 2 is supplied to the fuel injection pump 4 that generates high-pressure fuel, the common rail 5 that uses the high-pressure fuel, and the fuel injection valve 6. Can be prevented.

(Second Embodiment)
Hereinafter, other embodiments to which the present invention is applied will be described. In the following embodiments, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

  A second embodiment is shown in FIG. The second embodiment shows another example in which the aggregation layer 33 is disposed inside the filtration layer 37. FIG. 4 is a schematic perspective view showing each layer of the filter element according to the present embodiment.

  As shown in FIG. 4, the agglomerated layer 33 is disposed in the inner wall of the open end (upper side in the drawing) of the internal inlet passage 323. The agglomerated layer 33 is not limited to this, and may be disposed at an intermediate portion of the inner wall of the internal inlet passage 323 or an opening end side on the lower side as long as it is within the inner wall of the internal inlet passage 323. The fuel guided to the filter element 38 causes water particles in the fuel to agglomerate in the agglomeration layer 33 inside the filtration layer 37. Since the aggregated water particles move toward the lower downstream side, they are increased in size or grouped without stagnation in the aggregation layer 33.

  In addition, the fuel that moves downward together with the water particles does not flow into the inside of the filtration layer 37 from the inside, but from the lower end side of the filtration layer 37 as shown by the fuel flow in the direction of the arrow in FIG. This is because the path flowing through the layer 35 moves.

  The fuel flow in the direction of the arrow in FIG. 4 includes a fuel flow that passes through the agglomerated layer 33 from the top to the bottom and a fuel flow that passes through the water-repellent layer 35 and the filtration layer 37 from the bottom to the top. Wrapping in the axial direction (vertical direction in the figure).

(Third embodiment)
A third embodiment is shown in FIG. The third embodiment shows another example in which the aggregation layer 133 is arranged inside the filtration layer 37. FIG. 5 is a schematic perspective view showing each layer of the filter element according to the present embodiment.

  As shown in FIG. 5, the agglomerated layer 133 is disposed on the fuel upstream side (the upper end side in the drawing) of the internal inlet passage 323 and is disposed between the first internal outlet passage 322 and the internal inlet passage 323. . Specifically, the agglomerated layer 133 is disposed above the filtration layer 37, and the second filter medium 133 a of the agglomerated layer 133 is disposed in the fuel circulation passage 32 defined by the inner wall of the internal inlet passage 323. Has been placed.

  The second filter medium 33a of the agglomerated layer 33 is not limited to the one arranged on the upper end side of the internal inlet passage 323, but the inner wall of the internal inlet passage 323 is increased in diameter toward the fuel upstream side and the inner inlet is expanded in diameter. The second filter medium 33a may be accommodated in the inner wall of the passage 323. In this case, the second filter medium 133a is welded and fixed in the inner wall of the resin-made internal inlet passage 323.

  The structure in which the second filter medium 133a is welded and fixed in the inner wall of the resin internal inlet passage 323 is the same as that of the second filter medium 33a and the inner wall of the internal inlet passage 323 in the first and second embodiments. It can also be applied to configurations.

(Fourth embodiment)
A fourth embodiment is shown in FIG. In the fourth embodiment, in the filter element 38 including the aggregation layer 233, the water repellent layer 235, and the filtration layer 237, the fuel flow is not a flow that wraps in the axial direction, but the inside and outside of each layer 233, 235, 237 An example which flows in the (diameter direction in a figure) is shown. FIG. 6 is a schematic perspective view showing each layer of the filter element according to the present embodiment.

  The filter element 38 includes an aggregation layer 233, a water repellent layer 235, and a filtration layer 237. For example, the filter element 38 is an area (accommodated) defined by a side wall of the lower housing 39a, an upper support member 39d, and a lower support member 39c. And is supported by a lower support member (end plate) 39c.

  Further, the aggregation layer 233, the water repellent layer 235, and the filtration layer 237 are arranged as follows. That is, the first filter medium 235a of the water repellent layer 235 is disposed outside the third filter medium 237a of the filter layer 237, and the second filter medium 233a of the aggregation layer 233 is disposed outside the first filter medium 235a. Specifically, an annular first filter medium 235a is disposed outside the cylindrical third filter medium 237a, and an annular second filter medium 233a is disposed outside the first filter medium 235a.

  According to this, the 3rd filter medium 237a of the filter layer 237 and the 2nd filter medium 233a of the aggregation layer 233 are arrange | positioned inside and outside on both sides of the 1st filter medium 235a of the water repellent layer 235. Accordingly, when the fuel and the water particles move from the outside to the inside between the first filter medium 235a of the water repellent layer 235 and the second filter medium 233a of the aggregation layer 233, the water particles having a specific gravity greater than that of the fuel. Can be allowed to settle downward. In addition, the filter surface of the water repellent layer 235 is opposed to the fuel flowing from the outside to the inside and the water particles, so that at least a part of the water particles is in the process of sinking downward. Even if the water-repellent layer 235 may be reached, a part of the water-repellent layer 235 is repelled by the filter surface of the water-repellent layer 235 and is surely settled downward along the outside of the water-repellent layer filter surface.

  In addition, a gap forming member 234 is preferably provided between the second filter medium 233 a of the aggregation layer 233 and the first filter medium 235 a of the water repellent layer 235.

  As a result, the gap 236 is reliably formed by the gap forming member 234 between the second filter medium 233a and the first filter medium 235a. For example, when the fuel and the water particles move from the outside to the inside, for example. The water particles can be easily settled downward.

  Further, the gap forming member 234 includes guide members 234a and 234b that support the outer shapes of the first filter medium 235a and the second filter medium 233a, and a fluid passage forming partition wall 234c that extends from the guide members 234a and 234b. It is preferable to have.

  According to this, in the gap forming member 234, on the side where the fluid passage forming partition 234c extends from the guide members 234a and 234b, a fluid passage through which the fuel and the water particles can flow is formed in a region excluding the partition 234c. Is done. Thus, the water particles having a specific gravity greater than that of the fuel can pass through the fluid passage and further settle downward.

  Further, the filtration layer 237 and the water repellent layer 235 are not limited to those in which the rear surface 235u of the water repellent layer 235 and the front surface of the filter layer 237 are in contact with each other as shown in FIG. The front surface of the layer 237 may be simply arranged so as to face each other.

  In addition, the rear surface 235u of the water-repellent layer 235 and the front surface of the filter layer 237 are in contact with each other, in which the first filter medium 235a of the water-repellent layer 235 and the third filter medium 237a of the filter layer 237 are formed as separate members. Not limited to this, the water repellent layer 235 and the filtration layer 237 may be formed integrally. In this case, the water repellent layer 235 and the filter layer 237 are integrally formed by impregnating the outer peripheral side of the filter layer 237 with a material having the material characteristics of the water repellent layer 235.

  The lower open end of the cylindrical third filter medium 237a is closed. This is because the fuel flowing from the bottom to the top from the cementer (water collecting portion) 34 is prevented from being guided to the lower opening end. From the first internal outlet passage 322, the fuel that has passed through the internal inlet passage 2323 defined between the inner periphery of the side wall of the lower housing 39a and the filter surface of the second filter medium 233a of the aggregated layer 233 is the aggregated layer 233 and the repellent material. Intrusion into the lower open end of the third filter medium 237a without passing through the water layer 235 can be prevented.

  Here, the fuel flow path 32 is, in order toward the fuel downstream side, an introduction pipe 321, a suction port 313, a discharge port 314, a first internal outlet passage 322, an internal inlet passage 2323, a second internal outlet passage 328, And a lead-out pipe 329.

(Fifth embodiment)
A fifth embodiment is shown in FIG. In the fifth embodiment, in the filter element 38 including the aggregation layer 233, the water repellent layer 235, and the filtration layer 237, the fuel flow flows in and out of each layer 233, 235, 237 (diameter direction in the drawing). Another example is shown. FIG. 7 is a schematic perspective view showing each layer of the filter element according to this embodiment.

  The gap forming member 334 includes guide members 234a and 334b and a fluid passage forming partition wall 234c. The guide member 334b on the water repellent layer 235 side is not an annular shape, and is provided at a plurality of locations in the circumferential direction (this embodiment). In the example, discontinuous regions (spaces) are formed at four locations.

  As a result, even if there is a possibility that water particles repelled by the front surface 235d of the water repellent layer 235 may accumulate on the guide member 334b protruding from the front surface 235d along the front surface 235d, the water particles are not collected. It can be easily settled downward from a continuous region (space).

  The gap forming member 334 is not limited to the configuration having the guide member 334b on the water repellent layer 235 side, and may be configured not to have the guide member 334b on the water repellent layer 235 side. In this case, the outer shape of the first filter medium 235a of the water repellent layer 235 is supported by the front end surface of the fluid passage forming partition wall 234c extending inward from the guide member 234a on the aggregated layer 233 side.

(Sixth embodiment)
A sixth embodiment is shown in FIG. The sixth embodiment is an example in which a filter element 138 including a water repellent layer 35 and a filtration layer 37 is used, and the two layers 35 and 37 are arranged in order of the water repellent layer 35 and the filtration layer 37 with respect to the fuel flow. It is shown. FIG. 8 is a schematic perspective view showing each layer of the filter element according to the present embodiment.

  In the present embodiment, the filter element 138 includes the water repellent layer 35 and the filtration layer 37, and does not include the aggregation layer 33 with respect to the filter element 38 described in the first or second embodiment. Only different. That is, in the filter element 138, the first filter medium 35 a of the water repellent layer 35 is disposed below the third filter medium 37 a of the filter layer 37.

  Even in such a configuration, the fuel guided to the filter element 138 first flows out below the filtration layer 37 together with the water particles via the internal inlet passage 323 inside the filtration layer 37. Since there is no agglomerated layer 33 during this period, water particles in the fuel are not aggregated and do not increase in size or group of particles. However, the flow of fuel that moves downward together with the water particles is reversed at the water collecting portion 34. The water repellent layer 35 and the filtration layer 37 move upward in this order.

  That is, before the fuel and the water particles reach the filtration layer 37, only the water particles are repelled by the water repellent layer 35, and fuel other than the water particles reaches the filtration layer 37. In addition, the water particles repelled by the water repellent layer 35 before reaching the lower end side of the filtration layer 37 fall to the lower water collecting portion 34 without adhering to the water repellent layer 35.

  Since the water repellent layer 35 has a function of repelling water, the size of the third hole diameter 35b of the water repellent layer 35 is such that the first hole diameter 35b of the water repellent layer 35> the third hole diameter 37b of the filtration layer 37. If it is satisfactory.

  Here, the first hole diameter 35b is preferably set to a size such that water particles guided from the fuel tank 2 to the filter element 138 do not pass through the third hole diameter 35b. Thereby, the water repellent layer 35 can reliably prevent water from entering downstream.

  In the present embodiment described above, the filter element 138 has a simple structure in which the water repellent layer 35 is provided upstream of the filtration layer 37, thereby preventing an increase in pressure loss due to water particle adhesion to the filtration layer 37. be able to. Moreover, since the filter element 138 does not include the agglomerated layer 33, it is possible to prevent an increase in the pressure loss, that is, to improve the water separation performance, while suppressing an increase in cost.

(Seventh embodiment)
A seventh embodiment is shown in FIG. The seventh embodiment is a filter element 138 including a water repellent layer 235 and a filtration layer 237, and the two layers 235 and 237 are arranged in order of the water repellent layer 235 and the filtration layer 237 with respect to the fuel flow. An example is shown. FIG. 9 is a schematic perspective view showing each layer of the filter element according to this embodiment.

  In the present embodiment, the filter element 138 includes a water repellent layer 235 and a filtration layer 237, and gap formation associated with the aggregation layer 233 and the aggregation layer 233 with respect to the filter element 38 described in the fourth embodiment. The only difference is that the member 234 is not provided.

  That is, the water repellent layer 235 and the filter layer 237 are formed in a substantially cylindrical shape, and the first filter medium 235a of the water repellent layer 235 is provided outside the third filter medium 237a of the filter layer 237. The internal inlet passage 2323 is formed between the inner periphery of the lower housing 39a and the outer periphery of the first filter medium 235a, and the fuel guided to the filter element 138 passes through the internal inlet passage 2323 and passes through the water repellent layer 235. It is guided to the outer periphery of the first filter medium 235a.

  Even in such a configuration, the fuel guided to the filter element 138 first moves radially inward in the order of the water repellent layer 235 and the filtration layer 237 via the internal inlet passage 2323 outside the water repellent layer 235. To do.

  Since there is no agglomeration layer 233 during this period, water particles in the fuel do not agglomerate and do not increase in size or group of particles, but only the water particles are repelled by the water repellent layer 235, and the filter layer 37 has other than water particles. The fuel reaches. In addition, the water particles repelled by the water repellent layer 35 have the outer peripheral surface of the water repellent layer 35 extending in a substantially vertical direction as shown in FIG. It falls to the lower water collecting portion 34. On the other hand, the fuel filtered by the filter layer 237 moves upward as shown in FIG.

  In the present embodiment described above, the pressure loss due to water particles adhering to the filtration layer 237 can be achieved by providing the filter element 138 with a simple structure in which the water-repellent layer 235 is provided upstream (outer peripheral side) of the filtration layer 237. An increase can be prevented. In addition, since the filter element 138 is not provided with the agglomerated layer 233, it is possible to prevent an increase in pressure loss, that is, to improve water separation performance, while suppressing an increase in cost.

  Further, it is not necessary to provide the gap forming member 234 for facilitating the sedimentation of the water particles aggregated between the aggregation layer 233 and the water repellent layer 235 to the lower water collecting portion 34.

(Eighth embodiment)
An eighth embodiment is shown in FIG. The eighth embodiment is a filter element 238 including a water repellent layer 35, a filtration layer 37, and an ion exchange resin layer 83, and the three layers 35, 37, 83 are connected to the fuel flow with respect to the water repellent layer 35, An example in which the ion exchange resin layer 83 and the filtration layer 37 are arranged in this order is shown. FIG. 10 is a schematic perspective view showing each layer of the filter element according to this embodiment.

  In the present embodiment, the filter element 238 includes a water repellent layer 35, a filtration layer 37, and an ion exchange resin layer 83. For example, the ion exchange resin layer with respect to the filter element 138 described in the sixth embodiment. The only difference is that 83 is added. That is, in the filter element 238, the first filter medium 35 a of the water repellent layer 35 is disposed below the third filter medium 37 a of the filter layer 37 with the ion exchange resin layer 83 interposed therebetween.

  The ion exchange resin layer 83 captures metal ions eluted in the fuel by adsorption or the like. This ion exchange resin layer 83 is formed of an ion exchange resin 831 as a metal ion trapping member, and the ion exchange resin 831 is one of particles such as a sphere as a base material, powder, and fiber (this book In the embodiment, it is formed of particles as shown in FIG.

  Here, in general, the ion exchange resin 831 has a base material (so-called pellet) shape of any of particles, powders, and fibers as described above. The reason for making such a base material shape is to ensure a relatively wide capture surface for capturing metal ions. For this reason, it is easy to disperse only by putting the said base material in the required capacity | capacitance of an ion exchange resin.

  On the other hand, in this embodiment, the ion exchange resin 831 in the ion exchange resin layer 83 is formed on a mesh-shaped holding member made of resin or metal (not shown) made of resin (not shown). It is preferable to be accommodated. As a result, the water repellent layer 35 and the filtration layer 37 can be incorporated into the filter element 238 without the ion exchange resin 831 base material being scattered by the holding member.

  In the present embodiment described above, the fuel supplied to the filter element 238 has water particles in the fuel repelled by the water repellent layer 35 and the metal ions in the fuel by the water repellent layer 35 and the ion exchange resin layer 83. So that water particles and metal ions are prevented from flowing downstream.

  Moreover, since metal ions are more likely to be present in an aqueous solution than oil (non-aqueous solution) such as fuel, water particles and metal ions in the fuel are removed by the water repellent layer 35 and the ion exchange resin layer 83. Thus, the outflow of metal ions is reliably prevented downstream of the water repellent layer 35 and the ion exchange resin layer 83.

(Ninth embodiment)
A ninth embodiment is shown in FIG. In the ninth embodiment, a filter element 238 including a water repellent layer 35, a filtration layer 37, and an ion exchange resin layer 83 is used, and the three layers 35, 37, and 83 are connected to the ion exchange resin layer 83 with respect to the fuel flow. The other example which has arrange | positioned in order of the water-repellent layer 35 and the filtration layer 37 is shown. FIG. 10 is a schematic perspective view showing each layer of the filter element according to this embodiment.

  In the present embodiment, the filter element 238 is disposed in the order of the ion exchange resin layer 83, the water repellent layer 35, and the filtration layer 37 with respect to the fuel flow. That is, the ion exchange resin layer 83 is filled in the internal inlet passage 323. In this case, both opening end portions of the internal inlet passage 323 are fixed by the mesh-shaped holding member. As a result, the base material of the ion exchange resin 831 can be incorporated into the internal inlet passage 323 without scattering.

  Even if it is such a structure, the effect similar to 8th Embodiment can be acquired.

(Tenth embodiment)
A tenth embodiment is shown in FIG. The tenth embodiment shows an example of a filter element 438 having a honeycomb structure formed by bonding the first filter medium 435a of the water repellent layer 435 and the third filter medium 437a of the filter layer 437. FIG. 12 is a schematic perspective view showing each layer of the filter element according to this embodiment. FIG. 13 is a schematic perspective view in which a part of the filter element of FIG. 12 is enlarged. FIG. 14 is a plan view of the filter element of FIG. 13 as viewed from the downstream side of the fuel flow. FIG. 15 is a schematic cross-sectional view illustrating the flow of fuel filtered by the partition walls in the filter element of FIG.

In this embodiment, as shown in FIGS. 12 to 14, the honeycomb structure 438 a is formed by bonding the first filter medium 435 a of the water repellent layer 435 and the third filter medium 437 a of the filter layer 437. Specifically, the honeycomb structure 438a is formed by bonding the first filter medium 435a and the third filter medium 437a, and partition walls 4381 and 4382 having a plurality of cells 441d and 441u penetrating in the axial direction, and a plurality of cells 441d and 441u. In some of the cells, there are provided blocking members 440d and 440u for closing the cell ends. That is, the partition walls 4381 and 4382 as shown in FIG. 13 are composed of corrugated filter media 4382 and flat filter media 4381. Then, the corrugated filter medium 4382 and the flat filter medium 4231 are overlapped and wound in the longitudinal direction. Thus, the cylindrical filter element 438 as shown in FIG. 12 is formed by winding the partition walls 4381 and 4382.

  As shown in FIGS. 14 and 15, the partition walls 4381 and 4382 are formed by bonding the first filter medium 435a on the upstream side of the third filter medium 437a with respect to the fuel flow.

  Here, in FIGS. 13 to 15, the suffix “u” represents the upstream side of the fuel, and the suffix “d” represents the downstream side of the fuel.

  In such a filter element 438, the fuel supplied to the filter element 438 flows into the cell 441u of the honeycomb structure 438a, but the cell end portion on the downstream side of the cell 441u is blocked by the blocking member 440. As shown in FIG. 15, the fuel is filtered by the partition walls 4382 and 4381 that partition the cell 441u.

  In addition, the first filter medium 435a and the third filter medium 437a are bonded to each other so that the partition walls 4382 and 4381 are arranged in the order of the water repellent layer 435 and the filter layer 437 with respect to the fuel flow direction. The fuel filtration area can be effectively earned by using the partition walls 4282 and 4381 that partition the plurality of cells 441d and 441u of the structure 438a.

  Therefore, when the structure in which the water repellent layer 435 is provided upstream of the filter layer 437 is applied to the filter element 438, such a honeycomb structure 438a has an increased size of the filter element 438 even when compared with the comparative example of FIG. Can be suppressed, and an increase in pressure loss due to water particle adhesion to the filtration layer 437 can be prevented.

  Note that the comparative example of FIG. 16 shows a filter element 938 having a honeycomb structure in which partition walls 9381 and 9382 that partition the cells 441d and 441u are formed of only the third filter medium of the filter layer.

(Other embodiments)
(1) In the present embodiment described above, the filter element 38 including the aggregation layers 33, 133, 233, the water repellent layers 35, 235, and the filtration layers 37, 237 is accommodated in the housing 39. 39 has been described as being composed of a metal upper housing 39b and a metal lower housing 39a. Not limited to this, the upper housing 39b and the lower housing 39a may be made of resin or the like.

  (2) In the present embodiment described above, the fuel filtering device 3 has been described as having the filter element 38, the priming pump 31, the water sensor 341 and the drain cock 342, and the segmenter 34. Not only this but the structure which does not have the priming pump 31, or the structure which is provided with the filter element 38, the priming pump 31, and the segmenter 34, and does not have at least any one of the water surface sensor 341 and the drain cock 342, etc. Any configuration may be used as long as the filter element 38 and the cementer 34 are included.

1 is a schematic cross-sectional view showing a fuel filtration device according to a first embodiment of the present invention. It is a typical block diagram which shows the fuel supply apparatus to which the fuel filtration apparatus of the 1st Embodiment of this invention is applied. It is a schematic diagram explaining the structure of each layer in the filter element in FIG. It is a typical perspective view which shows each layer of the filter element concerning 2nd Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 3rd Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 4th Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 5th Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 6th Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 7th Embodiment. It is a typical perspective view which shows each layer of the filter element concerning 8th Embodiment. It is a typical perspective view showing each layer of a filter element concerning a 9th embodiment. It is a typical perspective view which shows each layer of the filter element concerning 10th Embodiment. It is the typical perspective view which expanded a part of filter element of FIG. It is the top view which looked at the filter element of FIG. 13 from the downstream of the fuel flow. It is typical sectional drawing explaining the flow of the fuel filtered with the partition in the filter element of FIG. FIGS. 16A and 16B are views showing a filter element of a comparative example, in which FIG. 16A is a plan view seen from the downstream side of the fuel flow, and FIG. 16B is a cross-sectional view showing the flow of fuel filtered by a partition wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Fuel tank 3 Fuel filter 31 Priming pump 32 Fuel passage (fuel distribution path)
321 Introduction pipe (passage wall of fuel passage)
322 First internal outlet passage 323 Internal inlet passage 328 Second internal outlet passage 329 Deriving piping 33 Agglomerated layer 33a Second filter medium 33b Second hole diameter 34 Sedimenter (water collecting portion)
342 Drain cock 35 Water repellent layer 35a First filter medium 35b First hole diameter 35d Front surface (lower end surface)
35u rear surface (upper surface)
37 filtration layer 37a third filter medium 37b third hole diameter 39 housing 39a lower housing 39b upper housing 39c lower support member 39d upper support member 4 fuel injection pump 42 low pressure supply pump 43 high pressure pump 44 cylinder (sliding hole)
45 Plunger 5 Common rail (pressure accumulator)
6 Fuel injection valve 60 Nozzle part 79 Solenoid valve 8 Internal combustion engine 90 ECU (control means)

Claims (12)

In a fuel filtration device comprising a filter element having a water repellent layer formed of a first filter medium capable of preventing water from entering,
The filter element is
An agglomerated layer formed of a second filter medium different from the first filter medium forming the water repellent layer, and agglomerates water particles in the fuel;
A filtration layer that is formed of a third filter medium different from the first filter medium and the second filter medium forming the water repellent layer, and traps substance particles;
With
Among the filter elements, the first filter medium of the water-repellent layer, the second filter medium of the aggregated layer, and the third filter medium of the filter layer include fuel introduced to the filter element, the aggregated layer, A fuel filtration device, wherein the water repellent layer and the filtration layer are arranged in order of filtration. The first filter medium of the water repellent layer, the second filter medium of the agglomerated layer, and the third filter medium of the filter layer have a first hole diameter, a second hole diameter, and a third hole diameter through which substance particles can pass, respectively. Has
2. The fuel filtering device according to claim 1, wherein the first hole diameter of the water repellent layer> the second hole diameter of the aggregated layer> the size of the third hole diameter of the filtration layer. The water repellent layer is formed from the first filter medium having hydrophobicity,
The fuel filtration device according to claim 1, wherein the agglomerated layer is formed from the second filter medium having hydrophilicity. The first filter medium of the water repellent layer, the second filter medium of the aggregated layer, and the third filter medium of the filter layer are:
The second filter medium of the aggregation layer is disposed inside the third filter medium of the filtration layer,
4. The fuel filter device according to claim 1, wherein the first filter medium of the water repellent layer is disposed below the third filter medium of the filter layer. 5. . The first filter medium of the water repellent layer, the second filter medium of the aggregated layer, and the third filter medium of the filter layer are:
The first filter medium of the water-repellent layer is disposed outside the third filter medium of the filter layer,
4. The fuel filtration device according to claim 1, wherein the second filter medium of the aggregation layer is disposed outside the first filter medium of the water repellent layer. 5. .   6. The gap forming member is provided between the second filter medium of the aggregation layer and the first filter medium of the water repellent layer. 6. The fuel filter device described in 1. The gap forming member is
A guide member that supports at least one of the first filter medium and the second filter medium along the one outer shape;
A partition wall for fluid passage formation extending from the guide member toward the other side;
The fuel filtering device according to claim 6, comprising: A filter element having a water repellent layer formed of a first filter medium capable of preventing water intrusion and a filter layer formed of a third filter medium different from the first filter medium forming the water repellent layer and capturing substance particles In a fuel filtration device comprising:
Among the filter elements, the first filter medium of the water repellent layer and the third filter medium of the filter layer filter the fuel guided to the filter element in the order of the water repellent layer and the filter layer. A fuel filtering device, wherein the fuel filtering device is arranged. The filter element includes an ion exchange resin layer formed of an ion exchange resin that captures metal ions,
9. The fuel filtration device according to claim 8, wherein the ion exchange resin layer is disposed upstream or downstream of the water repellent layer in the fuel guided to the filter element. The water repellent layer and the filter layer have a honeycomb structure formed by bonding the first filter medium and the third filter medium,
The honeycomb structure is
A partition having a plurality of cells penetrating in the axial direction, formed by bonding the first filter medium and the third filter medium,
In some of the plurality of cells, a blocking member that closes a cell end;
The fuel filtering device according to claim 8, wherein the fuel filtering device is provided. A fuel tank,
A fuel injection pump that sucks the fuel in the fuel tank and compresses the fuel into a high pressure;
A fuel filtration device according to any one of claims 1 to 10,
With
The fuel supply device, wherein the fuel filtering device is disposed between the fuel tank and the fuel injection pump. A fuel supply device according to claim 11 is provided.
Used in a fuel injection device for injecting and supplying fuel to an internal combustion engine,
A common rail for accumulating high-pressure fuel discharged from the fuel injection pump and supplying the accumulated high-pressure fuel to the fuel injection device;
A fuel supply device comprising:

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