JP2013245591A - Fuel filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that conventional fuel filtering devices do not consider a function for dropping dust contained in fuel to a bottom of a filter case and accordingly an amount of dust trapped by a filter element cannot be decreased.SOLUTION: A fuel direction control means for controlling a fuel route inside a filter support member 7 is provided above a chamber 5 of the fuel filtration device 1. Then, an flow-in direction of the fuel in relation to the chamber 5 is divided into a down direction and a horizontal direction in relation to a direction of gravity at the time of high flow rate. Accordingly, even if a fuel flow rate passing through the filter case 2 increases, a flow rate of fuel going down in relation to the direction of gravity inside the chamber 5 is prevented from exceeding a given value. Therefore, the dust sunken in a dust accumulation space 12 of the chamber 5 can be prevented from rising. As a result, a dust trapping amount of the filter element 4 can be decreased, thereby permitting the filter element 4 to be prolonged in service life.

Description

  The present invention relates to a fuel filtering device that is effective in extending the life of a filter element that captures dust contained in fuel sucked from a fuel tank.

2. Description of the Related Art Conventionally, for example, in a fuel supply device mounted on a vehicle such as an automobile, a fuel filtering device (fuel filter) is provided in the middle of a fuel flow path that communicates a fuel tank and a suction port of a fuel pump constituting the fuel injection device. Some are configured to be sucked into the fuel pump in a state where foreign matters contained in the fuel stored in the fuel tank are separated and removed.
By the way, the fuel filtering device described in Patent Document 1 removes foreign matters contained in the fuel and separates the water present in the fuel by sinking water to the bottom of the housing using the difference in specific gravity of the fuel. A filter element is provided.

However, in the conventional fuel filtering device, there is a description about the point that water present in the fuel is separated from the fuel and settled to the bottom of the housing, but dust such as dust / dust or metal powder contained in the fuel is described. The point of sinking to the bottom of the housing has not been fully considered.
Therefore, dust is trapped intensively by the filter element, and the amount of dust trapped by the filter element increases. As a result, when a large amount of dust is captured by the filter element, the filter element is likely to be clogged, which may reduce the durability of the fuel filtering device.

JP 2008-180209 A

  An object of the present invention is to provide a fuel filtration device capable of improving durability by reducing the amount of dust trapped by a filter element.

According to the first aspect of the present invention (fuel filter device), the dust contained in the fuel used in the internal combustion engine (by gravity) is placed near the bottom surface of the bottomed cylindrical case that houses the filter element that captures dust. It has a chamber that holds it in place.
This chamber is provided upstream of the filter element in the fuel flow direction and below the filter element in the gravity direction.
According to the first aspect of the present invention, the amount of dust trapped by the filter element can be reduced by allowing dust to settle in the chamber provided near the bottom surface of the case by gravity. As a result, the filter element is less likely to be clogged, so that the life of the filter element can be extended.
As a result, the durability of the fuel filtration device can be improved.

According to the invention described in claims 12 to 15, the fuel filtering device is provided with a water separation mechanism for separating water in the fuel, or a cylindrical shape that holds liquid other than fuel in the chamber of the fuel filtering device. A liquid holding space is provided.
The water separation mechanism is desirably provided above the chamber in the direction of gravity, particularly above the liquid holding space or the deposition space in the direction of gravity. The liquid holding space is desirably provided so as to surround the center of the bottom surface of the case in the circumferential direction.
Then, the fuel filter device bypasses the filter element from the outside of the case, guides the fuel to the center of the bottom surface of the case, and forms a bypass flow path that allows the fuel to flow out upward from the center of the bottom surface of the case in the gravity direction. A path forming member is provided.
By opening the fuel outlet of the flow path forming member above the center of the bottom of the case in the gravitational direction and below the interface between the liquid other than fuel and the fuel in the gravitational direction, the liquid other than the fuel and the fuel The dust settled down by gravity or centrifugal force can be adsorbed to the interface. Thereby, since the amount of dust trapped by the filter element can be reduced, the life of the filter element can be extended.

It is sectional drawing which showed the fuel filtration apparatus (Example 1). It is II-II sectional drawing of FIG. 1 (Example 1). It is sectional drawing which showed the fuel filtration apparatus (Example 1). FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 (Example 1). It is sectional drawing which showed the fuel filtration apparatus (Example 1). (Example 1) which is VI-VI sectional drawing of FIG. It is sectional drawing which showed the fuel filtration apparatus (Example 2). (Example 2) which is VIII-VIII sectional drawing of FIG. (Example 3) which is sectional drawing which showed the fuel filtration apparatus. (Example 3) which is XX sectional drawing of FIG. (A) is sectional drawing which showed the fuel filtration apparatus, (b) is XI-XI sectional drawing of (a) (Example 4). (Example 5) which is sectional drawing which showed the fuel filtration apparatus. (Example 5) which is sectional drawing which showed the fuel filtration apparatus. (Example 5) which is XIV-XIV sectional drawing of FIG.12 and FIG.13. It is the block diagram which showed an example which controls the internal pressure of a fuel filtration apparatus (Example 5). (Example 5) which is the block diagram which showed the other example which controls the internal pressure of a fuel filtration apparatus. (Example 6) which is sectional drawing which showed the fuel filtration apparatus. (Example 6) which is XVIII-XVIII sectional drawing of FIG. It is explanatory drawing which showed the behavior of the fuel in the fuel filtration apparatus, water, and dust (Example 6). (Example 6) which is the graph which showed the rising rate of dust.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Configuration of Example 1]
FIG. 1 to FIG. 6 show a fuel filtering device (Embodiment 1) to which the present invention is applied. In the fuel filtering device, dust is settled or deposited on the bottom of the filter case by gravity, and in the chamber. It has a structure that prevents the dust that has settled from rising again.

The fuel filtration device 1 of the present embodiment includes a fuel tank that stores fuel used in an internal combustion engine (engine) mounted on a vehicle such as an automobile, for example, and supplies fuel from the fuel tank to a cylinder of the engine. It is incorporated in a system (fuel supply device for an internal combustion engine).
The fuel supply system includes a fuel filtering device 1 that removes foreign matters contained in fuel pumped from a fuel tank, a fuel pump (supply pump) that pressurizes and pressurizes fuel sucked from the fuel filtering device 1, and this supply. A high-pressure fuel that is stored (accumulated) inside the common rail, having a common rail into which high-pressure fuel discharged from the pump discharge port is introduced, and a plurality of injectors to which high-pressure fuel is distributed and supplied from each fuel outlet of the common rail Is injected into each cylinder of the engine via each injector.

The supply pump includes a plunger that pressurizes fuel sucked into the pressurizing chamber, a cam mechanism that drives the plunger, and an electromagnetic that controls the amount of fuel sucked into the pressurizing chamber to control the fuel discharge amount. And a valve.
Each of the plurality of injectors includes a needle that opens and closes a nozzle hole that performs fuel injection, and an electromagnetic valve that controls the opening and closing operation of the needle.
The solenoid valve of the supply pump and each solenoid valve of the plurality of injectors are mounted on a vehicle such as an automobile through a pump drive circuit and an injector drive circuit that are electronically controlled by an engine control unit (electronic control unit: ECU). Electrically connected to the battery.

The fuel filtration device 1 has a cylindrical shape and is symmetrical with respect to the center axis of the filter case 2. When used, the center axis direction of the fuel filtration device 1 is the direction of gravity when mounted on a vehicle such as an automobile (hereinafter referred to as the direction of gravity). (Gravity direction).
A fuel filtration device 1 includes a bottomed cylindrical filter case 2 connected in the middle of a fuel supply pipe that guides fuel from a fuel tank to a fuel pump, a filter element 3 that separates water droplets contained in the fuel, The filter element 4 collects and captures the dust mixed in, the chamber 5 that sediments the dust by gravity, and the fuel direction control means that controls the flow direction of the fuel into the chamber 5.
Details of the fuel direction control means of this embodiment will be described later.

First, a description will be given of a system in which dust contained in fuel is settled by gravity in the chamber 5 below the filter elements 3 and 4 accommodated in the filter case 2 of the fuel filtering device 1.
The filter case 2 is made of synthetic resin or metal. A cylindrical fuel introduction pipe (center pipe) 6 connected to the fuel tank via a fuel supply pipe is provided on the central axis of the filter case 2. A filter support member 7 that accommodates the filter element 3 is fixed to the lower end of the center pipe 6 in the illustrated state, for example, in a suspended state.
The filter case 2 is formed with one inlet (inlet) port 10 that forms a fuel inlet for sucking (inhaling) fuel from an external fuel tank via a fuel supply pipe.
Details of the filter case 2 of this embodiment will be described later.

The filter element 3 is a second filter (water separation mechanism) in which a filtering material such as a non-woven fabric having a coarse mesh with respect to the filter element 4 is formed into a cylindrical shape, a spiral shape, a honeycomb shape, or a chrysanthemum shape, It is housed inside the filter support member 7 (cylindrical filter housing portion A). The filter element 3 may not be provided.
The filter element 4 is a first filter (dust filter) in which a filter material such as a fiber having a finer mesh than the filter element 3 and having high filterability is formed into a cylindrical shape, a spiral shape, a honeycomb shape, or a chrysanthemum shape. It is housed in the upper part of the case 2 (cylindrical filter housing part B). The present embodiment is a honeycomb type filter.

The chamber 5 includes a case lower space 11 that changes the fuel flow direction below and around the filter support member 7, and a dust accumulation space 12 that deposits or precipitates dust and water droplets on the bottom surface (case bottom surface) of the filter case 2. It has.
A cylindrical filter outer space 13 is formed around the filter support member 7 above the chamber 5. The filter outer peripheral space 13 is a fuel flow path (path) formed between the peripheral wall portion of the filter case 2 and the outer periphery of the filter support member 7.
Here, a cylindrical filter inlet space (fuel flow path) 26, a filter element 4, and a cylindrical filter outlet space (fuel flow path) 27 are formed around the center pipe 6.

Next, details of the filter case 2 of the present embodiment will be described with reference to FIGS.
The filter case 2 is installed in the vehicle such that the center axis direction thereof coincides with the vehicle vertical direction (gravity direction). The filter case 2 includes, for example, an upper case and a lower case which are divided into two parts. After the filter elements 3 and 4, the chamber 5 and the fuel direction control means are accommodated (or formed) in the lower case, the upper case and the lower case are accommodated. It is configured by integrating the joint with the case by joining means such as welding or welding.
In addition, you may employ | adopt the structure which provides a priming pump in the upper case side. The priming pump includes a diaphragm and a knob for swinging the diaphragm in the vertical direction. By gripping the knob and manually swinging the fuel, the fuel in the fuel tank is supplied to the fuel filtering device 1. This is a manual fuel pump having a well-known structure that pumps the fuel to the fuel injection device (supply pump, common rail, injector, etc.) side through the fuel path.

The inlet port 10 of the filter case 2 is opened at the upstream end in the fuel flow direction of the center pipe 6 located on the center axis of the filter case 2. That is, the inlet port 10 opens at the center of the top wall of the filter case 2.
Further, an inlet pipe having a fuel introduction channel formed therein may be interposed between the inlet port 10 and the fuel supply pipe, or the inlet pipe may be formed integrally with the filter case 2. .

The filter case 2 is formed with a plurality of outlet ports 14 that form fuel discharge ports for allowing fuel to flow out (discharge) to an intake port of an external supply pump via a fuel supply pipe. Note that at least two outlet ports 14 are provided.
These outlet ports 14 are provided at predetermined intervals so as to surround the periphery of the upstream end of the center pipe 6 in the circumferential direction. That is, the plurality of outlet ports 14 are opened at predetermined intervals in the circumferential direction at the periphery of the top wall of the filter case 2.
Further, an outlet pipe having a fuel outlet channel formed therein may be interposed between the outlet port 14 and the fuel supply pipe, or the outlet pipe may be formed integrally with the filter case 2. .

Here, in the center pipe 6, a fuel introduction passage 16 is formed which communicates the inlet port 10 and a fuel inlet 15 provided at the center of the top plate of the filter support member 7.
A filter housing part B for housing the filter element 4 is provided on the upper part of the filter case 2. The filter element 4 is installed so as to surround the center pipe 6 in the circumferential direction. A through hole into which the center pipe 6 is fitted is formed at the center of the filter element 4. The filter element 4 is liquid-tightly separated from the fuel introduction channel 16 by the center pipe 6.
In addition, a drain cock (not shown) that can be manually operated is provided at the bottom of the filter case 2, and water and dust accumulated in the dust accumulation space 12 below the filter case 2 are disposed below the filter case 2. (External) can be discharged.

The fuel path inside the filter case 2 is configured such that the fuel flows from the upper direction to the lower direction in the gravitational direction (the vehicle vertical direction). Thereafter, the fuel flows from the lower direction to the upper direction in the direction of gravity. That is, the fuel path inside the filter case 2 is configured such that the fuel flows in a U-shape in the chamber 5 below the filter elements 3 and 4.
Specifically, the path of the fuel flowing inside the chamber 5 includes a case lower space 11 and the like through which fuel flows from the filter support member 7 and flows out to the filter element 4. That is, the fuel that has flowed into the case lower space 11 from the filter support member 7 first flows from the upper direction to the lower direction (the dust accumulation space 12 side), and then from the lower direction to the upper direction ( It flows toward the filter element 4 side.
The chamber 5 has a water separation function for separating water in the fuel from the fuel. That is, water is settled in the case lower space 11 and the dust accumulation space 12 using the specific gravity difference between the fuel flowing into the chamber 5 and water, and is stored on the bottom surface of the filter case 2.

Next, details of the fuel direction control means of this embodiment will be described with reference to FIGS.
The fuel direction control means includes a filter element 3, a filter support member 7, first and second fuel paths 8, 9, and path switching means.
The filter element 3 is accommodated in the filter accommodating portion A of the filter support member 7. A fuel introduction channel 17 connected to the downstream end of the fuel introduction channel 16 in the fuel flow direction is formed at the center of the filter element 3.

The filter support member 7 includes an annular upper plate, a lower plate that forms a filter housing portion A between the upper plate, and a cylindrical side plate that surrounds the periphery of the filter housing portion A in the circumferential direction. ing. A fuel inlet 15 connected to the downstream end of the center pipe 6 in the fuel flow direction is formed at the center of the upper plate. The fuel inlet 15 is opened at the upstream end of the fuel introduction channel 17 in the fuel flow direction.
A disc-shaped baffle plate 18 constituting a flow direction changing member is provided at the center of the lower plate. The baffle plate 18 closes the downstream end of the fuel introduction channel 17 in the fuel flow direction. Thereby, the flow direction of the fuel flowing through the fuel introduction channel 17 is changed from the flow in the central axis direction of the filter case 2 to the flow in the radial direction (radially outward).
Therefore, the baffle plate 18 can prevent the fuel from directly flowing out from the fuel introduction flow path 17 toward the dust accumulation space 12 of the chamber 5, so that dust settled in the dust accumulation space 12 of the chamber 5 is supported by the filter. It is possible to prevent the fuel from flowing up again due to the flow of fuel flowing into the chamber 5 from the member 7.
An annular locking portion 20 that locks the filter element 3 is provided around the closing portion 19 of the baffle plate 18.

A plurality of fuel outlets 21 are formed in the lower plate for allowing fuel to flow out from the filter support member 7 to the chamber 5. These fuel outlets 21 are provided at predetermined intervals so as to surround the periphery of the baffle plate 18 in the circumferential direction. That is, the plurality of fuel outlets 21 are opened at predetermined intervals in the circumferential direction at the periphery of the lower plate of the filter support member 7. The plurality of fuel outlets 21 have circular or polygonal openings through which fuel can pass.
A plurality of fuel outlets 22 through which fuel flows out from the filter support member 7 to the chamber 5 are formed in the side plate. These fuel outlets 22 are opened at predetermined intervals (equal intervals) in the circumferential direction of the side plate. The plurality of fuel outlets 22 have oval, elliptical, or polygonal openings through which fuel can pass. The opening is provided so as to extend in the circumferential direction.

The first fuel path 8 that flows inside the filter support member 7 changes the direction of fuel inflow into the chamber 5 (the direction of fuel outflow from the filter support member 7 to the chamber 5) from above in the gravity direction of the filter case 2. This is a route with only a direction.
The first fuel path 8 includes a fuel introduction flow path 17 through which fuel is introduced from the fuel inlet 15, the filter element 3, and a plurality of fuel outlets 21 that discharge the fuel to the chamber 5.

The second fuel path 9 that flows inside the filter support member 7 changes the fuel inflow direction (the fuel outflow direction from the filter support member 7 to the chamber 5) into the chamber 5 from below in the gravity direction of the filter case 2. This is a route having a direction and a direction (lateral direction) other than the downward direction. The second fuel path 9 includes a fuel introduction flow path 17 through which fuel is introduced from the fuel inlet 15, the filter element 3, and a plurality of fuel outlets 21, 22 through which fuel flows out to the chamber 5.
The fuel direction control means is configured so that the fuel flowing into the chamber 5 from the plurality of fuel outlets 21 flows downward in the direction of gravity.
The fuel direction control means is configured such that the fuel flowing into the chamber 5 from the plurality of fuel outlets 22 flows in the direction other than the lower side in the gravitational direction (left and right (horizontal, horizontal) directions in FIG. 1).

The path switching means includes a plurality of flap bearings 23 installed on a side plate of the filter support member 7, a plurality of flaps 24 that can open and close each fuel outlet 22, and each flap 24 at an initial position (a fully closed position that closes the fuel outlet 22 ) To switch between the first fuel path 8 and the second fuel path 9 based on the flow rate of fuel flowing into the chamber 5.
The plurality of flap bearings 23 are pivotal support portions that rotatably support one circumferential end of each corresponding flap 24. These flap bearings 23 are provided at one end edge of each fuel outlet 22 in the circumferential direction.
The plurality of flaps 24 are movable plates having a shape (arc shape) corresponding to each fuel outlet 22 opened so as to extend in the circumferential direction (arc shape).
The flap return mechanism 25 is configured by a leaf spring or the like that urges each flap 24 toward the side where the fuel outlet 22 is closed.

[Operation of Example 1]
Next, the operation of the fuel filtering device 1 of this embodiment will be briefly described with reference to FIGS.

When the engine is started, the operation of the supply pump is started.
As a result, the fuel stored in the fuel tank is sucked from the suction port opened at the upstream end in the fuel flow direction of the fuel supply pipe and sucked into the fuel filtering device 1.
The fuel that has flowed into the fuel filtering device 1 from the fuel tank via the fuel supply pipe bypasses the filter element 4 from the inlet port 10 and flows into the fuel introduction passage 16.
As shown in FIGS. 3 and 5, the fuel that has flowed into the fuel introduction channel 16 flows from the upper direction to the lower direction in the direction of gravity and flows into the filter support member 7 of the fuel direction control means.

As shown in FIGS. 3 and 5, the fuel that has flowed into the fuel introduction channel 17 from the fuel inlet 15 flows from the upper direction to the lower direction in the gravitational direction, and the axial direction of the fuel introduction channel 17. It collides with the baffle plate 18 installed in a vertical direction (horizontal direction). As a result, the fuel flowing from the upper direction to the lower direction in the direction of gravity is changed to a flow in a radial direction perpendicular to the axial direction of the fuel introduction channel 17 as shown in FIGS. Is done.
As a result, the fuel flows into the filter element 3 from the fuel introduction flow path 17. Here, when the fuel passes through the filter element 3, foreign matters (water droplets) contained in the fuel are separated and removed. Further, foreign matters having a large particle size are captured by the filter element 3.

The fuel that has passed through the filter element 3 and has flowed out from the plurality of fuel outlets 21 toward the lower side of the filter support member 7 flows into the case lower space 11 of the chamber 5 below the filter element 3. The fuel that has flowed into the case lower space 11 flows toward the bottom side of the filter case 2 (from the upper side to the lower side in the gravity direction) when it flows out from each fuel outlet 21. However, since a plurality of outlet ports 14 are opened at the periphery of the top wall of the filter case 2, the fuel flow direction is reversed in the case lower space 11 above the bottom surface of the filter case 2 (U-turn, changed to the opposite direction). And flows into the filter outer peripheral space 13.
The fuel that has flowed into the filter outer peripheral space 13 is directed toward the filter element 4 that is disposed above the chamber 5. That is, the fuel whose flow direction is U-turned in the case lower space 11 flows from the downward direction to the upward direction in the gravity direction and flows into the filter element 4 as shown in FIGS. 3 and 5. Here, when the fuel passes through the filter element 4, foreign matters (dust etc.) having a small particle size contained in the fuel are captured and collected.
Thereafter, the fuel that has passed through the filter element 4 is sent to the supply pump through the outlet port 14.

Here, the plurality of fuel outlets 21 are always open, and the plurality of fuel outlets 22 correspond to the flow rate of fuel flowing through the fuel filtering device 1 (or the fuel pressure that changes according to this flow rate). The opening degree of the flap 24 changes. Thereby, the opening areas of the plurality of fuel outlets 22 are changed.
When the pressure difference between the inside of the filter support member 7 (filter housing part A) and the chamber 5 is small, that is, when the flow rate of fuel flowing into the chamber 5 is below a predetermined value, the spring force of the flap return mechanism 25 wins, The flap 24 closes each fuel outlet 22 (see FIGS. 3 and 4).
When the flow rate of the fuel flowing into the chamber 5 from the filter support member 7 increases and the pressure difference between the filter housing portion A and the chamber 5 increases, the spring force of the flap return mechanism 25 is lost, and each flap 24 is The fuel outlet 22 is opened (see FIGS. 5 and 6).

By the way, when the plurality of fuel outlets 22 are opened, they pass through the filter element 3 and pass from the plurality of fuel outlets 22 to the side of the filter support member 7 (filter outer peripheral space 13, lateral direction, radial direction outside). As shown in FIG. 5, the fuel that has flowed out flows toward the filter element 4 arranged above the chamber 5.
The dust D having a small particle size contained in the fuel that has flowed into the case lower space 11 of the chamber 5 settles in the dust accumulation space 12 and accumulates or settles on the bottom surface of the filter case 2 (see FIG. 3 and FIG. 3). (See FIG. 5).

[Effect of Example 1]
Fuel direction control means for controlling the fuel path inside the filter support member 7 is provided above the chamber 5 of the fuel filtering device 1 of the present embodiment in the direction of gravity.
The fuel direction control means includes a filter element 3, a filter support member 7, first and second fuel paths 8 and 9, and path switching means (a flap bearing 23, a flap 24 and a flap return mechanism 25). The fuel path inside the filter support member 7 is controlled in accordance with the flow rate of the flowing fuel (or the fuel pressure that changes in accordance with the flow rate).

Thereby, when the flow rate of the fuel flowing into the chamber 5 from the fuel outlet 21 of the filter support member 7 is low, the inflow direction with respect to the chamber 5 is set only in the downward direction of the gravity direction.
In addition, when the flow rate is high, the inflow direction with respect to the chamber 5 is distributed in the downward direction of the gravity direction and in the horizontal direction (lateral direction).
Therefore, even when the total flow rate of the fuel passing through the fuel filtering device 1 increases, the flow rate of the fuel going downward in the gravitational direction never exceeds a predetermined value. As a result, a problem that occurs when fuel flows in at a high flow rate in the dust accumulation space 12 below the filter support member 7, that is, the dust D that has been sedimented or deposited until then is prevented from rising again. can do.

As described above, in the fuel filtering device 1 of the present embodiment, the dust D is settled by gravity in the dust accumulation space 12 of the chamber 5 provided in the vicinity of the bottom surface of the filter case 2. By suppressing the dust D that has settled from rising again, it is captured and captured by the filter element 4 that is disposed downstream of the chamber 5 in the fuel flow direction and above the chamber 5 in the gravity direction. The amount of collected dust can be reduced. As a result, clogging is less likely to occur in the filter element 4, so that the life of the filter element 4 can be extended.
As a result, the durability of the fuel filtration device 1 can be improved.

[Configuration of Example 2]
FIG. 7 and FIG. 8 show a fuel filtering device (Example 2) to which the present invention is applied. In the fuel filtering device, dust is settled or deposited on the bottom of the filter case by gravity, and in the chamber. It has a structure that prevents the dust that has settled from rising again.
Here, the same reference numerals as those in the first embodiment indicate the same configuration or function, and the description thereof is omitted. The fuel filtering device 1 is not provided with the fuel direction control means of the first embodiment.

The fuel filtration device 1 of this embodiment is configured so that the dust settled in the dust accumulation space 12 of the chamber 5 does not rise again due to the flow of fuel flowing into the chamber 5 from the fuel outlet 21 of the filter support member 7. A dust sedimentation structure is installed above 12.
The filter element 3 of this embodiment is housed and held in the internal space (filter housing portion A) of the filter support member 7 as in the first embodiment.
The filter support member 7 of the present embodiment closes the downstream end of the fuel introduction flow path 17 in the fuel flow direction so that the fuel does not flow out from the fuel introduction flow path 17 toward the dust accumulation space 12 of the chamber 5. A plurality of fuel outlets 21 are provided for allowing the fuel to flow out toward the baffle plate 18 and the chamber 5 below the filter support member 7.

The dust sedimentation structure of the present embodiment includes a plurality of plate-like members (plate-like first to fourth annular portions 31) that suppress the rise of dust settled in the dust accumulation space 12, and the first to first of these. A plurality of structure support members (support portions 32) that support the four ring portions 31 are provided.
The first to fourth annular portions 31 are installed above the dust accumulation space 12 of the chamber 5 in the direction of gravity. Further, the first to fourth annular portions 31 are arranged so as to separate the case lower space 11 and the dust accumulation space 12. The first to fourth annular portions 31 are arranged concentrically around the central axis of the filter case 2. Moreover, the 1st-4th ring part 31 is formed in the annular plate shape, and an internal diameter and an outer diameter are small toward the inner periphery (radial direction inner diameter side).

The first annular part 31 is disposed on the innermost side of the first to fourth annular parts 31, that is, closer to the center axis of the filter case 2. Inside the first annular portion 31, the case lower space 11 and the dust accumulation space 12 are communicated, and a circle that allows dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2. A central opening 33 having a shape is formed.
The second to fourth annular portions 31 are arranged so as to surround the first to third annular portions 31 in the circumferential direction with a predetermined gap therebetween. The fourth annular part 31 is arranged on the outermost peripheral side of the first to fourth annular parts 31, that is, closer to the peripheral wall surface of the peripheral wall part 34 of the filter case 2.
Similarly, between the adjacent first and second annular portions 31, between the adjacent second and third annular portions 31, and between the adjacent third and fourth annular portions 31, the bottom surface side of the filter case 2 is similarly provided. Circumferential openings 35 that allow dust to settle into the dust accumulation space 12 are formed.
Similarly, between the fourth annular portion 31 and the peripheral wall portion 34, a circumferential opening 36 that allows dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2 is formed. .

The first to fourth annular portions 31 are arranged so as to have an inclination in a range that is not horizontal in the direction of gravity (the vehicle vertical direction). That is, the first to fourth annular portions 31 are inclined by a predetermined inclination angle with respect to the central axis direction of the filter case 2 and the horizontal direction perpendicular thereto. Note that the inclination angles of the first to fourth annular portions 31 may be different. For example, the outer periphery (radial outer diameter side) may be configured to be nearly perpendicular to the horizontal direction (the inclination is small).
The first to fourth annular portions 31 are arranged such that the radial gap becomes wider toward the inner periphery (radial inner diameter side).
In addition, you may arrange | position the 1st-4th annular ring part 31 so that it may mutually overlap (overlap) in a gravitational direction (vehicle up-down direction).
The plurality of support portions 32 are arranged in a radial direction around the central axis of the filter case 2. These support portions 32 fix the first to fourth annular portions 31 to the peripheral wall portion 34 of the filter case 2.

[Effect of Example 2]
In the conventional fuel filtration device, dust that has settled on the bottom surface of the filter case, where the fuel at a high flow rate flew up under conditions of high engine rotation speed, is collected in the filter element (dust filter). The life could be reduced.
In the fuel filtration device 1 of the present embodiment, the dust settling structure (first to fourth annular portions 31) is filtered so as to partially cover the upper part of the dust accumulation space 12 where dust settles and accumulates or settles. Since the case 2 is arranged concentrically around the central axis of the case 2, it is difficult for the fuel to flow in the dust accumulation space 12. As a result, even when the engine speed is high and the flow rate is high, dust that has settled on the bottom surface of the filter case 2 does not wind up due to the flow of fuel.
Accordingly, the precipitated dust does not reach the filter element 4. That is, the filter element 4 does not rise up.
As a result, the amount of dust trapped by the filter element 4 is reduced, and the life of the fuel filtration device 1 can be extended.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the first embodiment.

[Configuration of Example 3]
FIG. 9 and FIG. 10 show a fuel filtering device (Example 3) to which the present invention is applied. In the fuel filtering device, dust is settled or deposited on the bottom of the filter case by gravity, and in the chamber. It has a structure that prevents the dust that has settled from rising again.
Here, the same reference numerals as those in the first and second embodiments indicate the same configuration or function, and the description thereof will be omitted.

In the fuel filtration device 1 of the present embodiment, a dust sedimentation structure is installed above the dust accumulation space 12 as in the second embodiment.
The dust settling structure of the present embodiment includes a plurality of plate-like members (plate-like first to sixth cylindrical portions 41) that suppress the rise of dust that has settled in the dust accumulation space 12, and the first to sixth of these members. A plurality of structure support members (support portions 42) that support the cylindrical portion 41 are provided.
The first to sixth cylindrical portions 41 are installed above the dust accumulation space 12 of the chamber 5 in the direction of gravity. Further, the first to sixth cylindrical portions 41 are disposed so as to separate the case lower space 11 and the dust accumulation space 12. Further, the first to sixth cylindrical portions 41 are arranged concentrically around the central axis of the filter case 2. Further, the first to sixth cylindrical portions 41 are formed in a cylindrical shape, and the inner diameter and the outer diameter are smaller toward the bottom surface side (downward in the direction of gravity) of the filter case 2 and toward the inner periphery (radially inner diameter side). It has become.

The first cylindrical portion 41 is disposed on the innermost side of the first to sixth cylindrical portions 41, that is, closer to the center axis of the filter case 2. The first cylindrical portion 41 has a circular shape that allows the case lower space 11 and the dust accumulation space 12 to communicate with each other to allow dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2. The central opening 43 is formed.
The second to sixth cylindrical portions 41 are disposed so as to surround the first to fifth cylindrical portions 41 in the circumferential direction with a predetermined gap therebetween. The sixth cylindrical portion 41 is disposed on the outermost peripheral side of the first to sixth cylindrical portions 41, that is, closer to the peripheral wall surface of the peripheral wall portion 44 of the filter case 2.
Adjacent between the first and second cylindrical portions 41 adjacent, between the adjacent second and third cylindrical portions 41, between the adjacent third and fourth cylindrical portions 41, between the adjacent fourth and fifth cylindrical portions 41, and adjacent. Similarly, between the fifth and sixth cylindrical portions 41, circumferential openings 45 that allow the dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2 are formed.
Similarly, between the sixth cylindrical portion 41 and the peripheral wall portion 44, a circumferential opening 46 that allows dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2 is formed.

The first to sixth cylindrical portions 41 are extended in a direction parallel to the central axis direction of the filter case 2. Moreover, the 1st-6th cylindrical part 41 is comprised so that an outer periphery (radial direction outer-diameter side) may be arrange | positioned in a high position. For example, it is configured such that the outer side of the filter case 2 is arranged at a higher position than the center side of the filter case 2 so as to follow the flow of fuel flowing in the case lower space 11. As a result, the fuel collides with the first to sixth cylindrical portions 41 and the dust is easily separated from the fuel.
In addition, you may arrange | position the 1st-6th cylindrical part 41 so that the circumferential opening 45 may become wide toward the inner periphery (radial direction inner diameter side).
The plurality of support portions 42 are arranged in a radial direction around the central axis of the filter case 2. These support portions 42 fix the first to sixth cylindrical portions 41 to the peripheral wall portion 44 of the filter case 2.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the second embodiment.

[Configuration of Example 4]
FIG. 11 shows a fuel filtration device (Embodiment 4) to which the present invention is applied. In the fuel filtration device, dust is settled or deposited on the bottom of the filter case by gravity, and dust settled in the chamber. It has a structure that suppresses soaring again.
Here, the same reference numerals as in the first to third embodiments indicate the same configuration or function, and the description thereof is omitted.

The fuel filtration device 1 of this embodiment includes a filter case 2 in which a case lower space 11 and a dust accumulation space 12 are formed below a filter support member 7 similar to that of the second embodiment, and dust is disposed above the dust accumulation space 12. A sedimentation structure is installed.
The filter case 2 of the present embodiment is provided with a cylindrical peripheral wall portion 51 that accommodates the filter elements 3 and 4, and a concave portion (being provided below the peripheral wall portion 51, in which dust contained in fuel is allowed to settle and accumulate. A central bottom portion 52 and an annular stepped portion (periphery bottom portion) 53 surrounding the periphery of the opening periphery of the recess 52.
The recess 52 is provided by recessing the center of the bottom surface of the filter case 2, and the dust accumulation space 12 is formed therein. The recess 52 can be attached to and detached from the stepped portion 53 of the filter case 2.
The stepped portion 53 has a conical surface (tapered surface) that is inclined so that the bottom surface height decreases toward the opening peripheral side (inner peripheral side) of the recess 52.

The dust sedimentation structure of this embodiment includes a disk-shaped baffle plate 54 that prevents the dust settled in the dust accumulation space 12 and a plurality of structure support members (support portions 55) that support the baffle plate 54. It has.
The baffle plate 54 is disposed so as to cover the dust accumulation space 12 in the recess 52. A circumferential opening 56 is formed between the outer periphery of the baffle plate 54 and the conical surface of the stepped portion 53 to allow dust to settle to the bottom surface side (in the dust accumulation space 12) of the filter case 2. .
The dust sedimentation structure of the present embodiment prevents dust from rising by depositing dust in the center of the dust accumulation space 12 having a low flow velocity, and enables the recess 52 to be desorbed, thereby depositing sediment. Only (dust, moisture, etc.) can be removed.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the first to third embodiments.
Here, by arranging the dust sedimentation structure of the present embodiment above the dust accumulation space 12 shown in the first to third embodiments, the effect of preventing the dust from rising can be further improved.

[Configuration of Example 5]
FIGS. 12 to 16 show a fuel filtering device (Embodiment 5) to which the present invention is applied. In the fuel filtering device, dust is separated from fuel by centrifugal force and settled or deposited on the bottom of the filter case. The structure and the structure which suppresses that the dust settled in the chamber flies up again are provided.
Here, the same reference numerals as in the first to fourth embodiments indicate the same configuration or function, and the description thereof is omitted.

As shown in FIGS. 12 and 14, the fuel filtration device 1 of the present embodiment includes a filter case 2 that houses a filter element 4 therein. The filter case 2 includes a cylindrical filter support member 62 arranged concentrically with respect to a cylindrical peripheral wall portion (small diameter portion) 61.
An inlet pipe 64 having an inlet port (not shown) opened is connected to the upper case 63 provided at the upper part of the filter case 2. The upper case 63 is installed so as to surround the periphery of the upper peripheral wall 61 of the filter case 2 in the circumferential direction.
Inside the filter support member 62, a filter housing portion B for housing the filter element 4 is provided. Inside the filter support member 62, a fuel outlet channel 65 is formed which communicates with the filter housing portion B and allows fuel to flow out from the upper part of the filter case 2 to the engine. The fuel outlet channel 65 is a flow for guiding the fuel flowing in from the fuel inlet (opening) 66 below in the gravitational direction to the outlet port 14 opened at the center of the upper part (top wall) of the filter case 2 through the filter housing part B. Road.

Further, a cylindrical peripheral wall portion (large diameter portion) 67 having a larger cylindrical diameter than the peripheral wall portion 61 is connected to the lower portion of the peripheral wall portion 61 of the filter case 2. Inside the peripheral wall portion 67, a chamber 5 is provided below the filter element 4. The chamber 5 includes a dust accumulation space 12 for depositing or precipitating dust and water droplets on the bottom surface (case bottom surface) of the filter case 2.
In addition, a spherical convex portion 69 is provided at the central portion of the bottom plate 68 that forms the bottom portion of the filter case 2 so that dust easily settles at the stagnation point of the flow (the peripheral bottom surface around the central bottom surface). ing.
The convex portion 69 is a projection having a spherical bottom surface, and the bottom surface shape of the filter case 2 may be a hemispherical shape or a cone shape.

In addition, the fuel filtering device 1 has a swirl flow that spirally swirls along the peripheral wall surface (cylindrical inner surface) of the peripheral wall portion 61 of the filter case 2 to the flow of the fuel flowing into the filter case 2 above the chamber 5. A swirl flow generating means for generating
The swirling flow generating means includes a fuel inlet channel 71 formed in the inlet pipe 64, a swirling flow generating chamber 72 for promoting the fuel flowing into the filter case 2 from the inlet pipe 64 into a swirling flow, and the like. Has been.
The fuel inlet channel 71 has an arc shape so as to extend along a straight portion (straight channel) 73 that extends straight in a tangential direction of the peripheral wall surface of the peripheral wall portion 63 a of the upper case 63 and a peripheral wall surface of the peripheral wall portion 63 a of the upper case 63. And has a curved portion (curved flow path) 74 extending in the circumferential direction of the filter case 2.

Here, the fuel that has flowed into the swirl flow generating chamber 72 from the fuel inlet channel 71 through the communication portion (opening 76) formed in the cylindrical partition portion 75 swirls toward the center of the filter case 2. It flows below the filter case 2. This swirling flow is designed to flow along the outer periphery of the filter support member 62.
A dust accumulation space 12 having a cylindrical diameter larger than that of the peripheral wall portion 61 of the filter case 2 is installed below the filter case 2, and dust mixed in the fuel is swept from the swirl flow generation chamber 72 while being illustrated below. In the fuel flow that moves to the outside, the centrifugal separation is performed to the outside of the swirling flow. When the fuel flow flows into the dust accumulation space 12, the dust is further separated to the outside.

Thereafter, the fuel flows out from the fuel inlet 66 of the fuel outlet channel 65 installed above the dust accumulation space 12 to the upper filter element 4, but the dust precipitation space around the convex portion 69 of the bottom plate 68. The dust separated up to 77 settles at the stagnation point of the U-turn flow of the fuel, and thus remains collected in the dust precipitation space 77 without being affected by the flow of the fuel.
By the operation described above, dust that can be separated by the flow of fuel can reduce the amount collected by the filter element 4, so that it can be expected that the life of the filter element 4 will be extended accordingly.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the first to fourth embodiments.

If dust continues to be collected on the bottom surface of the filter case 2 of the fuel filtration device 1 by the dust collection method described above, some of the accumulated dust will be affected by the fuel flow and resuspended. It is collected by the filter element 4. In order to prevent such a situation, it is desirable that the dust collected in the lower part of the filter case 2 (the dust accumulation space 12 of the chamber 5) be structured so as not to be completely affected by the fuel flow.
Therefore, as shown in FIGS. 13 and 14, a structure in which a catch tank 81 for moving dust is installed in the lower part of the fuel filtering device 1 will be described.

The catch tank 81 is provided below the dust accumulation space 12 and the dust precipitation space 77 in the chamber 5 in the direction of gravity. Inside the catch tank 81 is formed an internal space (dust storage chamber 82) that separates and stores the dust D settled in the dust accumulation space 12 and the dust sedimentation space 77 from the flow of fuel flowing into the chamber 5. Yes.
The bottom plate 68 that forms the bottom of the filter case 2 is provided with an opening 83 that is a communication path that connects the dust accumulation space 12, the dust precipitation space 77, and the dust storage chamber 82. An opening / closing valve is provided on the dust storage chamber 82 side of the bottom plate 68.
The on-off valve is a pressure responsive valve that opens and closes in response to the pressure of fuel. The valve 85 opens and closes an opening 83 and an opening 84 communicating with the opening 83, and a valve case 86 supports the valve 85 so as to be slidable back and forth. , And a coil spring 87 that urges the valve 85 toward the valve closing side (the side that closes the openings 83 and 84).

The catch tank 81 and the dust accumulation space 12 are communicated with each other through the openings 83 and 84. In normal use, the openings 83 and 84 are liquid-tightly sealed by a valve 85 pressed against the coil spring 87.
The valve 85 and the coil spring 87 overcome the urging force of the coil spring 87 when the fuel pressure in the dust accumulation space 12 exceeds a predetermined value (when the fuel flow rate increases and the engine speed is high). The valve 85 is pushed down to open the openings 83 and 84 (open the on-off valve).
Since the opening 83 is formed in the bottom surface (bottom plate 68) of the dust accumulation space 12, it is desirable that the opening 83 is opened only immediately before the engine is stopped or just after starting from the viewpoint of stable fuel supply to the engine.

Next, FIG. 15 is a diagram showing a fuel supply device that controls the internal pressure of the fuel filtration device 1.
The fuel supply device includes a motor-driven feed pump 92 that pumps fuel from a fuel tank 91, a fuel filtering device 1 that removes foreign matters contained in the fuel sucked from the feed pump 92, and a suction device that is sucked from the fuel filtering device 1. A supply pump 93 that pressurizes the fuel to increase the pressure, a common rail (not shown) into which high-pressure fuel discharged from the discharge port of the supply pump 93 is introduced, and high-pressure fuel is distributed and supplied from each fuel outlet of the common rail And a plurality of injectors (not shown).

The feed pump 92 is an in-tank electric fuel pump installed in the fuel tank 91. An electric motor that is a power source of the feed pump 92 is electrically connected to a battery mounted on a vehicle such as an automobile via a pump drive circuit electronically controlled by the ECU 94.
The ECU 94 is configured to receive an output signal of a sensor that detects the operating state (driving condition) of the engine. As the sensor, a crank angle sensor (engine speed sensor), an operation state detecting means such as an accelerator opening sensor, a fuel pressure sensor or the like is used.
An electromagnetic on-off valve 95 is installed in the middle of the fuel supply pipe connecting the fuel filtering device 1 and the supply pump 93.
The electromagnetic open / close valve 95 is electrically connected to a battery mounted on a vehicle such as an automobile via an electromagnetic valve drive circuit electronically controlled by the ECU 94. The electromagnetic on-off valve 95 is configured to open when energized (ON) and close when energized is stopped (OFF). The feed pump 92 and the electromagnetic on-off valve 95 are controlled in conjunction so that the internal pressure of the fuel filtration device 1 (fuel pressure in the chamber 5) exceeds a predetermined value immediately before the engine is stopped or immediately after the engine is started. As a result, the dust in the chamber 5 of the fuel filtration device 1 settles and is stored in the dust storage chamber 82 of the catch tank 81.

Next, FIG. 16 is a diagram showing a fuel supply device that controls the internal pressure of the fuel filtration device 1.
The fuel supply device is provided with a return pipe 96 for returning a part of the high-pressure fuel generated by the supply pump 93 into the chamber 5 of the fuel filter 1 and an electromagnetic on-off valve 97 for opening and closing the return pipe 96. ing.
The electromagnetic on-off valve 97 is electrically connected to a battery mounted on a vehicle such as an automobile via an electromagnetic valve drive circuit electronically controlled by the ECU 94. The electromagnetic open / close valve 97 is configured to open when energized (ON) and to close when energized is stopped (OFF). This fuel supply device is configured to open the electromagnetic on-off valve 97 at a time when there is no problem in the return of the fuel (for example, immediately before the engine is stopped) and to return the high-pressure fuel into the chamber 5 of the fuel filtering device 1. Yes.
In addition, the structure of Example 5 shown in FIGS. 13 thru | or 16 is effective in both the system which settles dust with gravity, and the system which sediments dust with centrifugal force.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the first to fourth embodiments.

[Configuration of Example 6]
FIGS. 17 to 20 show a fuel filtering device 1 (Embodiment 6) to which the present invention is applied. The fuel filtering device adsorbs dust settled by gravity in the chamber at the interface between fuel and water. The structure and the structure which suppresses that the dust settled in the chamber flies up again are provided.
Here, the same reference numerals as in the first to fifth embodiments indicate the same configuration or function, and a description thereof is omitted.

The fuel filtration device 1 of the present embodiment includes a filter element 3 that separates water droplets in fuel between an inlet pipe 101 having an inlet port 10 and a dust accumulation space 12 in a chamber 5, and a filter that houses the filter element 3. A water separation mechanism having a support member 7 is installed.
In addition, water W is placed on the bottom of the filter case 2 in the dust accumulation space 12 so as to rise above the bottom of the filter case 2 in advance. Thus, the dust accumulation space 12 of the chamber 5 also serves as a cylindrical liquid holding space for holding a liquid (water W) other than fuel so as to surround the center of the bottom surface of the filter case 2 in the circumferential direction.

The fuel filtration device 1 also includes a flow path forming member (bypass pipe 102).
The bypass pipe 102 bypasses the filter elements 3 and 4 from the outside of the filter case 2 between the outer wall surface of the filter case 2 and guides fuel to the center of the bottom surface of the filter case 2. It is a concave wall part which forms the bypass flow path 103 which makes a fuel flow out into the chamber 5 of the upward direction.
A fuel inlet 104 opened near the inlet port 10 is provided at the upstream end of the bypass pipe 102 in the fuel flow direction. In addition, a fuel outlet 105 opened to face the dust accumulation space 12 of the chamber 5 is provided at the downstream end of the bypass pipe 102 in the fuel flow direction. The fuel outlet 105 is open above the center of the bottom surface of the filter case 2 in the gravity direction and below the interface between the liquid (water W) other than the fuel and the fuel in the gravity direction.

When the fuel flows into the filter case 2 from the inlet pipe 101, the fuel also flows from the fuel inlet 104 through which the fuel is circulated to the bypass channel 103 side.
There is a fuel outlet 105 at the center of the bottom surface of the filter case 2. The fuel outlet 105 is at least above the bottom surface of the dust accumulation space 12 and prevents the settled dust D from rising again.
The dust D in the fuel settles by gravity in the dust accumulation space 12 and is adsorbed by coming into contact with the water W.

Here, the water W that has settled or settled in the dust accumulation space 12 due to the fuel that has flowed out of the fuel outlet 105 has a convex shape as shown by the broken line arrows in FIGS. Flow in the outer peripheral direction (radial direction) of the direction occurs. As a result, the dust at the interface between the fuel and the water W moves in the outer peripheral direction, and moves so as to settle downward in the figure on the outer periphery as indicated by solid arrows in FIGS. 17 and 19.
Further, since the water W is present, the water W serves as a protective wall even when the flow rate of the fuel is large, and the dust D can be prevented from rising due to the flow of the fuel.
As a result, the ratio of dust D going to the filter element 4 can be reduced, and the life of the filter element 4 can be extended.
Here, the behavior of fuel, water, and dust is shown in FIG. Moreover, the effect of the invention (Example 6) with respect to the conventional product is shown in FIG.
“Dust soaring rate” is “dust that soars due to fuel flow” / “dust that has already settled”.
As described above, the fuel filtering device 1 of the present embodiment has the same effects as those of the first to fifth embodiments.

[Modification]
In the present embodiment, the fuel filtering device of the present invention is applied to the fuel filtering device 1 incorporated in the fuel supply device that supplies fuel to an internal combustion engine (engine) such as a diesel engine. You may apply to the fuel filtration apparatus (fuel filter) integrated in the fuel supply apparatus which supplies fuel to internal combustion engines (engine), such as a gasoline engine.
Moreover, you may install the fuel filter apparatus 1 in a fuel tank.
Further, a dust holding portion (dust precipitation portion) constituted by the dust accumulation space 12 of the chamber 5, a peripheral wall portion surrounding the dust accumulation space 12, and a bottom plate forming the bottom surface of the dust accumulation space 12 is provided as a filter case. It is good also as detachable with respect to 2 filter accommodating parts.
Further, the fuel to be filtered by the fuel filtering device 1, that is, the fuel sucked from the fuel tank and supplied to the engine side is not only gasoline or diesel oil (light oil) but also alcohol mixed with alcohol such as ethanol and gasoline. Fuel, bioethanol or 100% ethanol fuel may be used.

1 Fuel Filter 2 Filter Case 3 Filter Element (Water Separation Mechanism)
4 Filter element (dust filter)
5 Chamber 6 Center pipe 7 Filter support member (flow direction changing member, inflow direction control means)
11 Case lower space 12 Dust accumulation space 18 Baffle plate (flow direction changing member)

Claims (15)

In a fuel filtration device (1) comprising a filter element (4) that captures dust (D) in fuel and a bottomed cylindrical case (2) that houses the filter element (4),
The fuel filtration device (1) includes a chamber (5) for holding dust (D) near the bottom surface of the case (2),
The fuel filter device, wherein the chamber (5) is provided upstream of the filter element (4) in the fuel flow direction and below the filter element (4) in the gravity direction. The fuel filtration device (1) according to claim 1,
The fuel filter device (1) includes a flow direction changing member (7, 18) for changing a fuel flow direction in the case (2). In the fuel filtration device (1) according to claim 1 or 2,
The fuel filtering device (1) is provided with inflow direction control means (3, 7, 8, 9, 23, 24, 25) for controlling the inflow direction of fuel into the chamber (5). Filtration device. The fuel filtration device (1) according to claim 3,
The inflow direction control means includes a first fuel path (8) in which the inflow direction of fuel into the chamber (5) is only from the upward direction to the downward direction of the gravity direction of the case (2),
A second fuel path (9) in which the inflow direction of the fuel to the chamber (5) is a direction from the upper direction to the lower direction of the gravity direction of the case (2) and a direction other than the lower direction,
And path switching means (23, 24, 25) for switching between the first fuel path (8) and the second fuel path (9) based on the flow rate of fuel flowing into the chamber (5).
A fuel filtration device comprising:   The fuel filtering device (1) according to any one of claims 1 to 4, wherein the chamber (5) deposits or precipitates dust (D) on a bottom surface of the case (2). A fuel filtration device having a deposition space (12). The fuel filtration device (1) according to claim 5,
The case (2) has a structure (31, 32, 41, 42, 54, 55) that suppresses the rising of dust (D) that has settled in the accumulation space (12),
The fuel filtering device according to claim 1, wherein the structure (31, 32, 41, 42, 54, 55) is installed above the deposition space (12) in the direction of gravity. The fuel filtration device (1) according to claim 6,
The structure is a plurality of plate-like members (31, 32, 41, 42) surrounding the periphery of the central axis of the case (2) in the circumferential direction,
The fuel filter device, wherein the plurality of plate-like members (31, 32, 41, 42) are arranged concentrically around the central axis of the case (2).   The fuel filtering device (1) according to any one of claims 1 to 7, wherein the case (2) is a recess (52) for depositing and depositing dust (D) contained in the fuel. ) And an annular step portion (53) surrounding the periphery of the opening periphery of the recess (52), and the recess (52) is provided by denting the center of the bottom surface of the case (2). The fuel filtering device according to claim 1, wherein the step (53) is inclined so that the bottom surface height decreases toward the opening peripheral side of the recess (52). The fuel filtering device (1) according to any one of claims 1 to 8, wherein the case (2) has a peripheral wall surface extending in a central axis direction thereof.
The fuel filtering device (1) swirls along the peripheral wall surface of the case (2) in the flow of fuel flowing into the chamber (5) upstream of the chamber (5) in the fuel flow direction. A fuel filtering device comprising swirl flow generating means (71, 72) for generating swirl flow. The fuel filtration device (1) according to any one of claims 1 to 9, wherein the fuel filtration device (1) is provided on a lower side in the gravity direction of the chamber (5), A catch tank (81) for separating and storing dust (D) settled in the chamber (5) from a flow of fuel flowing into the chamber (5);
A communication path (83) communicating the chamber (5) and the catch tank (81);
A fuel filtration device comprising an on-off valve (85, 86, 87) for opening and closing the communication passage (83). The fuel filtration device (1) according to claim 10,
The on-off valves (85, 86, 87) open the communication passage (83) when the fuel pressure in the chamber (5) or the flow rate of fuel flowing into the chamber (5) exceeds a predetermined value. It is comprised so that it may carry out. The fuel filtration apparatus characterized by the above-mentioned. 12. The fuel filtration device (1) according to any one of claims 1 to 11,
The fuel filtration device (1) is provided with a water separation mechanism (3, 7) for separating water in the fuel flowing into the case (2). A fuel filtration device (1) according to any one of claims 1 to 12,
The chamber (5) has a cylindrical liquid holding space (5, 12) for holding a liquid (W) other than fuel so as to surround the center of the bottom surface of the case (2) in the circumferential direction. A fuel filtration device characterized by the above. The fuel filtration device (1) according to claim 13,
The fuel filtering device (1) bypasses the filter element (4) from the outside, guides fuel to the center of the bottom surface of the case (2), and moves upward from the center of the bottom surface of the case (2) in the gravity direction. And a flow path forming member (102) that forms a bypass flow path (103) through which fuel flows out. The fuel filtration device (1) according to claim 14,
The flow path forming member (102) is a fuel outlet that opens above the center of the bottom surface of the case (2) in the gravitational direction and below the gravitational direction from the interface between the liquid (W) other than fuel and the fuel. (105) The fuel filtration apparatus characterized by the above-mentioned.

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