JPH09228914A - Filtration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove even minute trash which is mixed in a fuel to simplify the exchange of a filter, water draining, and air exhaust by guiding the liquid fuel which flows in through an inlet of a main body vessel through a filtration element in an upper part of the main body vessel to an engine after it passes water filled in a water collection part in a lower part of the main body vessel. SOLUTION: In a filtration device, liquid in which water, fuel, trash, etc., are mixed and which flows in through a first inlet 1a flows in a lower chamber 35 formed by a side wall 35a of a partition plate and a partition wall 39. In a water collection part 32 provided in a lower region of the lower chamber 35, water drops into water W due to its self-weight, and minute particles of trash move from the fuel to the water side because water enters the particles and its weight is increased due to hydrophilic property and surface tension of trash itself when the fuel dives into lower end of the partition wall 39. Next, the fuel passes a float 41 and through holes 41a, 46 of a lid 46, rises, and then passes the inside of a filtration cassette 49 provided in an internal chamber 40 of the partition wall 39 and is guided to an upper case 50 in which a filtration element 51 is stored through a communicating pipe which passes through an upper chamber 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a compact filter device for removing foreign matters such as dust mixed in fluid fuel (hereinafter simply referred to as fuel) such as light oil and gasoline.

[0002]

2. Description of the Related Art Generally, fuel supplied to an engine is
To remove water, dust, rust, iron, etc. from the fuel supply system,
A water separator is attached to the fuel supply system together with the fuel filter.

For example, in the fuel supply system of the engine shown in FIG. 5, a manual pump 2 is connected to a fuel tank 1 for containing fuel, a water separator 3 is installed above the fuel tank 1 and the manual pump 2, and piping is provided. It is connected by p.

The fuel in the fuel tank 1 is sucked by the feed pump 4, and is passed through the pipe p through the manual pump 2 and the water separator 3 to the fuel filters 5, 5.
The fuel is supplied to the injection nozzle 7 by the injection pump 6 and is injected into the engine (not shown).

In the fuel supply system thus configured, the fuel sucked from the fuel tank 1 by the feed pump 4 is
Water is mainly separated by the water separator 3,
Foreign substances such as rust are removed by the fuel filters 5 and 5. The excess fuel that overflows in the fuel filters 5 and 5 and the injection nozzle 7 is returned to the tank 1 by the return circuit m.

In the fuel supply system thus constructed, as shown in FIG. 6, the water separator 3 has a fuel inlet 9 and a fuel outlet (formed behind the fuel inlet) in a transparent container body 8 made of synthetic resin. (Not shown) is attached to the lid body 10, and a float 11 having a specific gravity slightly smaller than that of water and a little larger than that of the fuel is provided in the container body 8 so that the water and the fuel The two are separated by using the difference in specific gravity, and the float 1 is placed at the separated boundary.
It is possible to know the amount of accumulated water from the position of the float 11 by making 1 float.

The water separator 3 is for removing water from the fuel, and it is preferable that water is not always present in the transparent container body 8. It is said that it is desirable to perform the removal.

The water drainage is performed by removing the drain plug 13 after removing the air drain plug 12, or by draining the water.
Since air will enter into the water separator 3 through the hole from which 2 is removed, the manual pump 2 is operated to draw the fuel from the tank 1 into the water separator 3 and to expel the air. The air vent plug 12 is tightened to close the hole.

Foreign substances such as dust or rust in the fuel are removed by the fuel filters 5 and 5. If foreign matter gets stuck in the fuel filters 5, 5, the filters 5, 5
Replace the filtration element 16 inside.

The fuel filters 5 and 5 are, as shown in FIG. 7, a case 15 provided under the body 14.
A filter element 16 is provided in the interior of the body 14. The fuel that has flowed in from the inlet passage 17 of the body 14 is filtered by the filter element 16 and flows out from the outlet passage 18. An air vent plug 19 is provided in the air vent, and if the air vent plug 19 is removed, the air that has entered after replacing the filter element 16 can be easily vented.

Then, the cleaned fuel is sent to the injection nozzle 7 through the injection pump 6.

[0012]

However, in the above-described conventional fuel supply system, fine dust that is not removed by the fuel filter that removes foreign matters such as dust contained in the fuel is directly supplied to the engine. Will be carried.

When such fine dust enters an extremely thin fuel passage portion such as the injection nozzle 7 of the engine, it is burnt together with the fuel when it burns, but its sludge adheres to the injection nozzle 7, Carbon grows with this sludge as a nucleus, as a result, the fuel is completely burned, carbon monoxide in the exhaust gas after combustion,
NOx increases and causes air pollution.

When the fuel filter 5 becomes clogged, the work of replacing the filter element 16 of the fuel filter 5 is performed, but air may enter inside during this work. Air removal in this case is performed by operating the manual pump 2 in the same manner as in the case of the water separator 3, but since the air that has entered the fuel filter 5 at a position considerably distant from the manual pump 2 is removed, this air is removed. The water separator 3 may enter the fuel separator 3 again or the other fuel filters 5 and the like, which may cause a troublesome work to completely remove the air.

In particular, as shown in FIG. 5, when the fuel filters 5 and 5 are provided in multiple stages in order to surely remove foreign matter, which fuel filter 5 or 5 is clogged immediately. It is impossible to judge, and eventually all the fuel filters 5 and 5 have to be replaced, and the air bleeding must be performed while checking all the things, which makes the work even more troublesome. .

Further, once the fuel filters 5 and 5 are clogged, it is necessary to check whether or not the peripheral equipment such as the pump containing the foreign matter is also damaged. Not only replacement of the filter but also various check work is required, and maintenance and inspection takes time.

Moreover, if the fuel filter 5 is clogged, the filter paper of the filter may be broken by the pressure of the feed pump 4 pushing the fuel, and the life of the filter paper is shortened.

In addition, the fuel filter 5 is installed in the middle of the piping.
When both the water separator 3 and the water separator 3 are attached, there is a drawback that it is not preferable in terms of space for a small engine room.

The present invention has been made in view of the problems of the prior art as described above, and it is possible to remove even fine dust mixed in the fuel, and it is easy to replace the filter and bleed water or air. An object is to provide a compact filtration device that can be performed.

[0020]

The filtration device according to the present invention for achieving the above object allows a fuel to pass through water stretched in a water storage portion of a main body container, and has a fine effect that adversely affects an engine. It is characterized in that large amounts of dust are removed from the fuel.

Even if the fuel, from which fine dust is removed, is injected from the injection nozzle into the engine, sludge, carbon, etc. do not adhere to the injection nozzle, and the engine easily burns completely. The amount of carbon monoxide, NOx, black smoke, etc. contained in is significantly reduced. Moreover, because the engine easily burns completely, it is possible to prevent the situation where incompletely burned blow-by gas enters the crank chamber and pollutes the engine oil, which prolongs the life of the engine oil and consequently improves the durability of the engine. To do.

When the fine dust is removed in this way, when the fuel is next passed through a filter element, a feed pump, an injection pump, an injection nozzle or the like, the fine dust may cause clogging or malfunction. It does not occur and the entire fuel system has a long life.

The above-mentioned water separator 3 and fuel filter 5 can be eliminated, and the fuel supply system can be made compact.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall schematic view of an engine fuel system in which a filtering device according to the present invention is incorporated, FIG. 2 is a sectional view showing an embodiment of the filtering device according to the present invention, and FIG. 3 is a line 3-3 in FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 2, but members common to those shown in FIGS. 5 to 7 are given the same reference numerals.

As shown in FIG. 1, the engine fuel system in which the filtering device 30 of the present embodiment is incorporated communicates a fuel pump 2 with a fuel tank 1 in which the fuel is stored, and the fuel from the fuel pump 2 is supplied to the fuel tank 1. It is adapted to be supplied to the first inlet Ia of the filtering device 30 which will be described later in detail through the pipe P 1.

The fuel filtered by this filtering device 30 flows out from the first outlet Oa, is sucked by the feed pump 4 through the pipe P2, and is injected from the injection nozzle 7 by the injection pump 6 through the fuel filter 5 to the diesel nozzle. It is supplied to an engine (not shown).

Since the filter device 30 has the feed pump 4 continuously connected to the outlet O side, the filter device 30 is of a fuel suction type for sucking fuel, and the filter paper R provided in the filter device 30 is not damaged. It will be extremely few.

The excess fuel that is not used in this diesel engine and has overflowed is clean after being filtered, and therefore is returned to the second portion of the filtering device 30 by the return circuit m.
However, the present invention is not limited to this, and may be directly returned to the fuel tank 1 as shown by the broken line in the figure. Alternatively, both may be installed side by side.

The symbol "B" in FIG.
Is a bypass circuit when a problem such as clogging occurs.

The filter device 30 of the present embodiment shown in FIG. 2 will be outlined. The fuel flowing from the first inlet Ia of the main body container 31 is introduced into the water reservoir 32 provided in the lower part of the main body container 31. After passing through the stretched water W, the water is passed through the upper filtering element 51 and guided to the engine. The main body container 31 is made of aluminum alloy or iron, and the O-ring is provided on the upper part of the main body container 31. And an upper case 50 attached via O.

First, the main body container 31 is formed by detachably connecting an upper container 31a and a lower container 31b with a screw portion N, and the inside is partitioned by a partition plate 33 into an upper chamber 34 and a lower chamber 35. There is.

A first inlet Ia and a second inlet Ib are provided on the side wall of the lower chamber 35, and the first inlet Ia is communicated with the fuel tank 1 through the fuel pump 2 and the second inlet Ib.
Is designed to allow return fuel from the engine side to flow in. In addition, a first outlet Oa and a second outlet Ob are opened in the side wall 34a of the upper chamber 34, and the first outlet Oa is for discharging the filtered fuel to the engine side,
The second outlet Ob is a port used when two filtering devices 30 are installed side by side or for returning the fuel returned from the return circuit m to the first inlet Ia as it is.

These both inlets Ia and Ib and the both outlets O
Each of a and Ob is opened at a position facing the main body container 31. In this way, the two inlets I and the two outlets O are opened at the opposite positions of the main body container 31 because the filtering device 30 is provided.
No matter what state the vehicle with the
This is because the water surface in 0 can be supported by the principle of the gyroscope so that the water surface is held horizontally.

That is, as shown in FIG. 3, the main body container 31
Bearings J are attached to the respective inlet / outlet portions of the, and the respective outlet / inlet portions are rotatably supported, and the outlet side bearings and the inlet side bearings are supported by one support member 37, 38.
The support members 37 and 38 are connected to the vehicle body side. In addition, a coupling C that can be freely rotated at each of the entrances and exits (see FIG. 1)
The filter device 30 is connected to the fuel pipe P via the so that the filter device 30 can be oscillated and displaced independently of the fuel pipe P. In order to make the filtering device 30 swing more smoothly, it is preferable that the fuel pipe P itself be formed of a flexible tube or the like.

As a result, the filtering device 30 can always take a horizontal position regardless of the vehicle body side by the principle of the gyroscope, and the water surface in the filtering device can be kept horizontal.

A partition wall 39 is provided in the lower chamber 35 so that the fuel flowing from each inlet I flows downward toward the bottom wall.
Is hung from the lower surface of the partition plate 33, and the lower end of this partition wall 39 is submerged below the water surface of the water reservoir 32 provided in the lower portion of the main body container 31. Therefore, the fuel that has flowed in goes under the lower end of the partition wall 39 to flow into the internal chamber 40, and is forced to come into contact with the water W. That is, the inflowing fuel comes into contact with the water W as it dives under the lower end of the partition wall 39, and the fine dust particles contained in the fuel are affected by the hydrophilicity and interfacial tension of the particles themselves. The water enters the tank, the weight of the water increases, the water moves from the fuel to the water side, the water is removed from the fuel, and the water is deposited on the bottom of the water storage section 32.

On the other hand, a float 41 having a specific gravity that is lighter than water and heavier than fuel is provided in the internal chamber 40 formed by the partition wall 39, and the two are partitioned by utilizing the difference in specific gravity between water and fuel. The float 11 is configured to float at the boundary portion.

The disk portion 42 of the float 41 has such a size that it covers substantially the entire area of the inner chamber 40 and has a function of suppressing fluctuations in the water surface.

Further, from the disc portion 42 of the float 41, an on-off valve 44 for opening and closing a water discharge portion 43 provided on the bottom wall.
Is suspended and the amount of water in the water reservoir 32 is adjusted by raising and lowering the float 41. The water discharge part 43 bypasses the opening / closing valve 44 of the float 41 and is connected to the main body container 31.
It is preferable to form a small-diameter drain passage 45 for discharging fine dust settled to the outside at the bottom of the.

The fuel that has passed through the water rises through the inner chamber 40 of the partition wall 39 and is guided toward the upper case 50, so that the float 41 is provided with a large number of through holes 41a. The fuel rises through the hole 41a.

A step portion is formed on the partition wall 39, and a lid 46 is screwed into a screw portion N formed on the inner peripheral surface of the step portion. And a filtration cassette described later is held. A large number of through holes 46a are also formed in this lid 46, and the fuel rises through these through holes 46a.

In the inner chamber 40 between the lid 46 and the lower surface of the partition plate 33, a large number of filtration pellets 48 mainly made of activated carbon are contained in a case 47 made of a punching plate or the like having a large number of holes. A packed filtration cassette 49 is provided. Since the filter pellet 48 has a property of having fine through holes or communication passages inside, when the fuel flows in contact with the filter pellet 48, relatively large dust that is not removed by contact with the water is generated. Since the filter pellets 48 also have the property that the particles of activated carbon remove offensive odors or adsorb and remove sulfur and phosphorus, the offensive odors and sulfur in the fuel are removed. It also removes the offensive odor and sulfur oxides generated during combustion from the root.

However, in the present invention, it is not always necessary to provide the filtration cassette 49 in the internal chamber 40 formed by the partition plate 33 and the partition wall 39, and a normal filter may be used in some cases. Also, it has been experimentally proved that even without this, favorable results can be obtained for the engine.

The upper case 50 is a closed container in which the filtering element 51 is housed, and the partition wall 39
The main body container 31 by the communication pipe 52 communicating with the internal chamber 40 of
The fuel from will be introduced. In this filter element 51, a large number of filter papers R are laminated around a hollow central shaft 53, but in some cases, a through hole 54 penetrating the filter paper R may be opened. The fuel filtered by the filter paper R passes through the central shaft 53 from the upper end chamber 55, is guided to the upper chamber 34, and flows out from the outlets Oa and Ob.

In the upper chamber 55 of the upper case 50,
The air contained in the fuel collects, and this air is discharged to the outside by the air vent 57 provided in the top plate 56. A float 59 having a specific gravity lighter than that of the fuel is accommodated in the air vent portion 57 in a passage 60, and an opening / closing valve 61 provided at an upper end of the float 59 opens / closes a communication port 62 communicating with the outside. Has become.

In order to make this air bleeding smooth, it is preferable to form small radial through holes 63 in the air bleeding portion 57.

Next, the operation will be described.

When the engine is started, the feed pump 4 is also started accordingly, and fuel and the like are drawn from the tank 1 and supplied to the engine while being filtered in the filtering device 30.

In this case, in the filtering device 30, the first
The liquid, which is mixed with water, fuel, mud, dust, or the like, which has flowed in through the inlet Ia, first flows into the lower chamber 35 formed by the side wall 35a of the partition plate 33 and the partition wall 39 through the inlet Ia. In the lower region of the lower chamber 35, the water storage 32
Since water, mud, etc. fall into the water W due to its own weight, the fine dust particles generate hydrophilic or interfacial tension that the dust itself has when the fuel dives under the lower end of the partition wall 39. Due to the influence, water enters the particles, their weight increases, they move from the fuel to the water side, and they are removed from the fuel. As a result, water, mud, fine dust, and the like settle on the bottom of the water storage section 32 due to its own weight. Then, in the lower region of the inner chamber 40, water having a high specific gravity is stored in the lower portion and fuel having a low specific gravity is stored in the upper portion, and is separated. A float 41 exists at this boundary portion and separates water and fuel.

When the amount of water in the water storage section 32 exceeds a predetermined amount, the float 41 rises and the on-off valve 44 opens,
Water containing mud and fine dust is discharged from the water discharge portion 43 to the outside.

As described above, in the present embodiment, first, the water in the water reservoir 32 removes the fine dust and mud contained in the fuel. Since it has the most adverse effect on the engine, the removal of this minute dust greatly improves the life of the engine itself. Next, when the fuel is passed through the filter element 51, the fuel element 5, the fuel pump 4, the injection pump 6, the injection nozzle 7 or the like, clogging and malfunction due to fine dust will not occur, and the entire fuel system will be prevented. As a result, it will have a long life.

According to the experiment, the size of the fine dust removed here is about 1/1000 mm to 4 mm.
It has been found that dust particles of about / 1000 mm, that is, micron-order dust are removed.

Next, this fuel is used for the float 41 and the lid 46.
Through the through holes 41a and 46a of the partition wall 39, and passes through the inside of the filtration cassette 49 provided in the internal chamber 40 of the partition wall 39. Since a large number of filter pellets 48 are packed in the filter cassette 49, relatively large dust is removed by the fine through holes or communication passages of the filter pellet 48. According to experiments, the size of dust removed here is
It has been found to be about 1/100 mm.

Further, since the filter pellets 48 whose main raw material is activated carbon removes offensive odors in the fuel and adsorbs and removes sulfur and phosphorus, the offensive odors and sulfur oxides generated during fuel combustion are removed from the root. It will be.

When this filtering device 30 is inclined due to the inclination on the vehicle side, the water in the water storage portion 32 and the water storage portion 32 concerned.
The dust or the like settled on the bottom of the container tends to move to the upper chamber 34 side, but in the present embodiment, each entrance and exit portion is rotatably supported by the bearing J against such a large inclination,
Since the water surface in the filtering device is kept horizontal by the principle of the gyroscope, the upper chamber 34
Movement to the side is prevented. Also, due to the vibration of the vehicle, the water in the water storage section 32 swells, and fine dust and the like tend to float, but this swelling of water is caused by the relatively large float 4 described above.
The disc part 42 of 1 blocks.

In this way, the fuel from which relatively large dust and the like has been removed is guided to the upper case 50 through the communication pipe penetrating the inside of the upper chamber 34. This upper case 50
Since filter paper R is laminated inside, larger dust is removed here. Experiments have revealed that the size of dust removed here is about 2/100 mm.

Further, here, the air contained in the fuel also collects, but when the amount of this air exceeds a predetermined amount, the float 59 of the air vent 57 moves downward due to its own weight, and the on-off valve 61 opens. , Air is discharged to the outside through the communication port 62.

Only the pure fuel from which dust and air have been removed in this way is sent by the fuel pump 4, passes through the fuel filter 5, and is injected into the injection pump 6.
Is supplied from the injection nozzle 7 to a diesel engine (not shown).

However, the fuel used in the engine is about 30% of the fuel supplied to the engine,
Most of the fuel overflows the fuel filter 5 and the injection nozzle 7, and this fuel is returned to the second inlet Ib of the filter device 30 by the return circuit M. In other words, the fuel flowing through the inside of the filtration device 30 may be supplied at a flow rate that corresponds to the fuel used,
The speed should be slow and good.

Therefore, the fuel flows while being in sufficient contact with the water W and the filtration pellets 48, and the function of removing fine dust in the water storage section 32 and the function of adsorbing dust in the filtration pellets 48 in the filtration cassette 49 are sufficient. It is exerted and the foreign matter in the fuel can be reliably removed.

Therefore, the fuel filter 5 is not clogged, and sludge or the like is not attached to the tip of the injection nozzle 7. Therefore, the engine is easily burned completely, and carbon monoxide contained in the exhaust gas after combustion, N
The amount of Ox or black smoke is greatly reduced. Moreover, because the engine easily burns completely, it is possible to prevent the situation where incompletely burned blow-by gas enters the crank chamber and pollutes the engine oil, which prolongs the life of the engine oil and consequently improves the durability of the engine. To do.

When the filter device 30 is clogged, the fuel pump 4 supplies the fuel to the engine through the bypass circuit B, and while the fuel is supplied in this way, the filter element 51 is supplied. And filtration cassette 4
Replace 9.

This replacement work is extremely simple and can be replaced with a new one simply by uncoupling the main body container 31 or removing the lower container 31b and the lid 46 of the main body container 31.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified and used. For example,
In the above-described embodiment, the number of the filtering device 30 is one, but not only this, but another filtering device 30 may be provided in the second outlet O.
A larger amount of fuel can be filtered by connecting b with a pipe or the like.

[0066]

As described above, according to the present invention, the fuel is passed through the water stretched in the water storage portion of the main body container, and the fine dust that most adversely affects the engine is removed from the fuel. As a result, the complete combustion of the engine can be promoted, the amount of carbon monoxide, NOx, black smoke, etc. in the exhaust gas can be greatly reduced, the durability of the engine can be improved, and the entire fuel system can have a long service life. Become. Further, by eliminating the water separator and the fuel filter, the fuel supply system can be made compact.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram of an engine fuel system in which a filtering device of the present invention is incorporated.

FIG. 2 is a cross-sectional view showing the same filtering device.

3 is a sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along line 4-4 of FIG.

FIG. 5 is an overall schematic diagram of an engine fuel system of a conventional filtering device.

FIG. 6 is a cross-sectional view of a water separator.

FIG. 7 is a sectional view of a fuel filter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel tank, 31 ... Main body container, 32 ... Water storage part, 33 ... Partition plate, 34 ... Upper chamber,
34a ... Side wall of upper chamber, 35 ... Lower chamber, 3
5a ... Side wall of lower chamber, 37 ... Support member, 38 ...
Support member, 39 ... Partition wall, 40 ... Internal chamber, 4
1 ... Float, 43 ... Water discharge part, 44 ... Open / close valve, 45 ... Discharge passage, 48 ... Filter pellet,
50 ... Upper case, 51 ... Filtration element, 52
... communication pipe, 59 ... air vent, C ... coupling, Ia ... first inlet, Ib ... second inlet, Oa
... first outlet, Ob ... second outlet, J ... bearing,
S ... Sealing material, P1, P2 ... Fuel pipe, W ... Water.

Claims (5)

[Claims] 1. The fluid fuel flowing from the inlet (I) of the main body container (31) is stored in a water reservoir (32) provided in the lower part of the main body container (31). After passing through the inside, the filtering device is characterized in that it is guided to the engine through the inside of the filtering element (51) provided on the upper part of the main body container (31). 2. The interior is divided into an upper chamber (34) and a lower chamber (35) by a partition plate (33), and a side wall (34a) of the upper chamber (34) is provided with a fluid fuel outlet (O). The main body container (31) in which a fluid fuel inlet (I) is opened in the side wall (35a) of the lower chamber (35)
And a partition wall (39) hanging from the lower surface of the partition plate (33) for guiding the fluid fuel flowing from the inlet (I) so as to once flow down to the bottom wall side, and the main body container (31) The water is stored in a water storage part (32) provided in the lower part and storing the water to the extent that the lower end of the partition wall (39) is submerged, and in the inner chamber (40) formed by the partition wall (39). Water discharge part that has a specific gravity lighter than (W) and heavier than fluid fuel and discharges the water (W) to the outside.
A float (41) having an on-off valve (44) for opening and closing (43) and a filter element (51) which is detachably attached to the upper part of the main body container (31) via a sealing material (S). And a closed upper case (50) having an air vent (59) for discharging air to the outside, and an internal chamber (4) of the partition wall (39).
The filtration device according to claim 1, further comprising a communication pipe (52) that connects the (0) and the upper case (50). 3. The filtration device according to claim 2, wherein the inner chamber (40) of the partition wall (39) is filled with filtration pellets (49) containing activated carbon as a main raw material. 4. The float (41) is provided in the water discharge part (43).
The drain passage (4) of small diameter that bypasses the open / close valve (44) of the main container (31) and discharges the fine dust deposited on the bottom of the main container (31) to the outside.
The filtration device according to claim 2 or 3, further comprising 5). 5. An inlet (I) of the main body container (31) has a first inlet (Ia) communicating with the fuel tank (1) and a second inlet (Ia) into which return fuel from the engine side flows. Ib) and
The outlet (O) of the main body container (31) has a first outlet (Oa) for discharging the filtered fluid fuel to the engine side, and an emergency for supplying the fluid fuel with the first or second inlet (Ia). , Ib) and a second outlet (Ob) flowing out toward the both inlets (Ia, Ib).
b) and both outlets (Oa, Ob) to the main container (3
The fuel pipes (P1, P2) are connected to each other via the rotatable coupling (C), which is opened at the opposite position of 1), and these inlet and outlet parts are supported by the bearings (J) as well as the outlet side bearings, and The bearings on the inlet side are supported by a supporting member (37, 38), and the supporting members (37, 38) are connected to the vehicle body side, according to any one of claims 2 to 4. Filtration device.