JP6140096B2 - Refueling system using gas-liquid separator - Google Patents

Description

  The present invention relates to a fuel supply system using a gas-liquid separator for preventing a gas phase such as entrained air from entering a fuel tank during fuel supply.

  In a vehicle equipped with, for example, a metal fuel tank that is not flexible, an air layer is formed on the fuel liquid level of the fuel tank as the internal combustion engine (engine) consumes fuel. If it does so, evaporation of fuel will be accelerated | stimulated from the relationship of saturated vapor pressure.

  For example, the fuel vapor existing in the upper space of the fuel tank is discharged from the fuel tank to the outside as the liquid level in the fuel tank rises during refueling. The discharged fuel vapor is adsorbed by an adsorbent such as activated carbon provided in a known evaporative fuel processing apparatus called a canister, and is prevented from being released into the atmosphere. In addition, the adsorbent is regenerated by burning the fuel vapor adsorbed by the adsorbent in the engine.

  By the way, the amount of evaporated fuel generated increases as the upper space in the fuel tank increases. For this reason, for example, Patent Document 1 tries to eliminate the upper space that can be formed above the liquid surface in the fuel tank by using a material made of a flexible material.

JP-A-8-197968

  However, the technique of Patent Document 1 has a disadvantage that a considerable space is still formed on the liquid surface, and the evaporation of fuel is promoted by the space. Moreover, in the technique of patent document 1, there exists a room for improvement about air being involved at the time of refueling. That is, there is considerable room for improvement in suppressing the generation of evaporated fuel.

  Then, this invention makes it a subject to provide the oil supply system which can suppress generation | occurrence | production of evaporative fuel as much as possible.

In order to solve the above problems, the present invention provides a flexible fuel tank, a gas-liquid separator for gas-liquid separation of a gas-liquid two-phase flow in which air is mixed with fuel into a gas phase and a liquid phase, an inlet pipe for guiding the gas-liquid two-phase flow in the gas-liquid separator, and a liquid outlet pipe for guiding the liquid phase to the fuel tank from the gas-liquid separator, the gas-liquid separator, the A gas phase outlet pipe for discharging the gas phase, and the gas phase outlet pipe and the inlet pipe communicate with each other, or a filler pipe provided closer to the fuel filler port than the gas phase outlet pipe and the inlet pipe. A connecting passage between the inlet pipe or the filler pipe and the passage is provided with a tube for discharging the gas phase, and the gas phase is provided in the fuel filler port. From the vapor discharge hole formed, it is exhausted into the outside air only at the time of refueling .

  ADVANTAGE OF THE INVENTION According to this invention, the fuel supply system which can suppress generation | occurrence | production of evaporated fuel as much as possible can be provided.

It is the schematic explaining the whole structure of the oil supply system using the gas-liquid separator which concerns on 1st Embodiment. It is the A section longitudinal cross-sectional view of FIG. 1 for demonstrating the internal structure of a gas-liquid separator among the oil supply systems using the gas-liquid separator which concerns on 1st Embodiment. It is an expanded sectional view of the important section (B section) of Drawing 1 among oil supply systems using a gas liquid separator concerning a 1st embodiment. It is an expanded sectional view of the important section (C section) of Drawing 3 among oil supply systems using a gas liquid separator concerning a 1st embodiment. It is a figure explaining the principal part structure of the oil supply system using the gas-liquid separator which concerns on 2nd Embodiment. It is a figure explaining the modification of 1st Embodiment and 2nd Embodiment.

Hereinafter, an oil supply system using the gas-liquid separator according to the present embodiment will be described with reference to FIGS. 1 to 6.
In the following description, an automobile oil supply system will be described as an example, but the present invention is not limited thereto. The present invention can also be applied to fuel refueling to devices other than automobiles, such as industrial machines.
Hereinafter, the fuel to be refueled will be described by taking gasoline as an example, but is not limited thereto. The present invention can also be applied to refueling equipment that uses volatile oil other than gasoline, for example, light oil or kerosene as fuel.
Further, in the following description, the vertical, horizontal, and horizontal direction axes will be described in the drawings unless otherwise specified.

(First embodiment)
As shown in FIG. 1, in the fuel supply system 100 of the present embodiment, the liquid phase outlet pipe 7 of the gas-liquid separator 30 is connected to a fuel tank 60 made of a soft material.
One end of a return pipe U is attached to the gas phase outlet pipe 6 of the gas-liquid separator 30, and the other end of the return pipe U is connected to the inlet of the gas-liquid separator 30 via a pipe connection member 42. The pipe 5, the filler pipe 40, and the breather tube 41 are connected.
Further, assuming that the pipe connecting member 42 side of the filler pipe 40 is one end side, a fuel filler port 52 is provided on the other end side, and gasoline as fuel is injected from the nozzle 51 at the tip of the fuel gun 50. And can be refueled.

  Here, the fuel tank 60 is a flexible flexible tank, and is a bag-like tank that changes its shape flexibly following the amount of remaining fuel. When used as a fuel tank for automobiles, it clears the impact resistance and other indicators set forth in safety standards.

  Examples of specific material candidates for such a fuel tank 60 include high-density polyethylene resin (HDPE) and ethylene vinyl alcohol copolymer (EVOH).

  The fuel tank 60 has flexibility as described above and deforms following the amount of remaining fuel. Therefore, even when gasoline is consumed by combustion of the engine, for example, an air layer (between the liquid level of the gasoline and the fuel tank is larger than that of the conventional fuel tank shown in Patent Document 1). This type of tank has no space and no fuel vapor is generated.

That is, it can be said that the fuel tank 60 is a fuel tank that does not give any room for generating fuel vapor if it can be filled with liquid gasoline and filled with the liquid.
In the figure, descriptions of a fuel pump and piping for supplying fuel from the fuel tank 60 to the engine are omitted.

  In the present embodiment, the connection portion (communication hole) between the liquid phase outlet pipe 7 and the fuel tank 60 is substantially equal to the lowermost portion when the fuel tank 60 is fully filled with the liquid. It is preferable to be provided at a position.

This is because if the connection part (communication hole) is installed at a place other than the lowest part when the tank is full, the liquid level in the fuel tank 60 is lower than the connection part (communication hole) as the amount of remaining fuel decreases. There is a case. This is because there is a possibility that gasoline flows from the liquid reservoir 18 (details will be described later in FIG. 2) of the gas-liquid separator 30 toward the fuel tank 60 and an air layer is formed in the liquid reservoir 18 portion.
If an air layer is formed in the liquid reservoir 18 of the gas-liquid separator 30, the air may be mixed into the fuel tank 60 at the next refueling. Incidentally, when air is mixed into the fuel tank 60, the amount of fuel that can be filled in the fuel tank 60 decreases. Therefore, the connection portion (communication hole) between the liquid phase outlet pipe 7 and the fuel tank 60 is preferably provided at the lowest position when the fuel tank 60 is full.

  The gas-liquid separator 30 uses a device that performs gas-liquid separation using the surface tension effect of gasoline. For example, an apparatus described in Japanese Patent Application Laid-Open No. 2013-117372 is known, and is used in the present embodiment.

  In general, the gas-liquid separator includes a centrifugal separation type and a surface tension type. Among these, the centrifugal type separates the liquid phase and the gas phase by centrifugal force, so that the gas phase and the liquid phase can be satisfactorily separated when the gasoline flow rate (fuel supply speed to the fuel tank 60) is high. On the other hand, the surface tension type has a merit that the gas phase and liquid phase can be well separated even when the gasoline flow speed (oil supply speed) is slow, and the surface tension type can handle a wide range of gasoline flow speeds. is there. In addition, the surface tension type does not require an additional device such as a separate high-speed swirling flow generation mechanism unlike the centrifugal separation type, and the apparatus can be reduced in size and cost. Although both types are applicable as the gas-liquid separator 30, in this embodiment, a surface tension type gas-liquid separator is used. A schematic description of the internal cross section of the gas-liquid separator 30 will be given later in FIG.

  The return pipe U is a pipe connecting the gas-phase outlet pipe 6 and the inlet pipe 5, and the liquid phase discharged from the gas-phase outlet pipe 6 (exactly, it is not sufficiently separated by the previous gas-liquid separation). In addition, a gas-liquid two-phase flow) is returned to the inlet pipe 5 to constitute a loop mechanism that causes the gas-liquid separator 30 to perform gas-liquid separation over and over again.

  The breather tube 41 is an air vent tube for releasing the gas phase separated in the connection member 42 into the outside air through a vapor discharge hole 53 provided in the oil supply port 52 (described later in FIG. 4). ).

  In addition, all of piping, pipes, and tubes used in the present embodiment may be made of metal, may be made of resin, or may be other than that. In view of weight reduction, ease of attachment, and handling, it is preferable to use a resin tube, but it is not particularly limited thereto.

  FIG. 2 is a vertical cross-sectional view of part A of FIG. 1 for explaining the internal configuration of the gas-liquid separator 30 according to the present embodiment.

  In FIG. 1, when gasoline is injected from the nozzle 51 of the fuel gun 50, the gasoline is guided to the inlet pipe 5 of the gas-liquid separator 30 shown in FIG. At this time, it is known that air is mixed into the liquid gasoline in a form involving a high flow rate by the fuel gun 50 (generation of a gas-liquid two-phase flow).

  When the gas-liquid two-phase flow is guided to the inlet pipe 5, it passes through the inflow chamber 19 and is guided to the left and right narrow spaces 12, 12 by the inlet partition 16.

  Further, below the narrow spaces 12, 12, a grooved body 4 having a micro bellows groove 2, which is a small groove portion formed in a bellows shape, is installed in the vertical direction until it is regulated by the outlet partition 8. Yes.

  When a gas-liquid two-phase flow is introduced to this part, the air (and gasoline vapor) entrained at the time of refueling is separated from the liquid phase gasoline by the surface tension of liquid gasoline. Gas-liquid separation chamber 1).

  That is, the liquid phase of the gas-liquid two-phase flow that flows into the grooved body 4 adheres to the surface of the micro bellows groove 2 and forms a liquid film. Further, the droplets carried on the gas phase collide with the surface of the groove 2 to form a liquid film.

  Subsequently, the liquid film flows downward, accumulates in a space formed by the lower contraction tube portion 13 and the outer body 10 to form a liquid reservoir 18 and is discharged from the liquid phase outlet pipe 7. The gas phase from which the droplets have been removed rises due to buoyancy in the liquid phase, and rises to the gas phase inlet end 21 in the gas phase and is then discharged from the gas phase outlet pipe 6 ( For details, refer to the summary of JP2013-117372A and paragraphs 0034-0036 and FIGS.

  Here, in this example, it is desirable that the liquid reservoir 18 portion of the gas-liquid separator 30 is always filled with liquid gasoline. This is because when the liquid reservoir 18 is not filled with gasoline, an air layer is formed in the liquid reservoir 18 and the air may be mixed into the fuel tank 60. If air is mixed in, evaporative fuel is likely to be generated. Further, the substantial volume of the fuel tank 60 is reduced.

Next, the operation of the oil supply system of this embodiment will be described with reference to FIG.
FIG. 3 is an enlarged cross-sectional view of a main part (part B) of FIG. 1 in an oil supply system using the gas-liquid separator according to the present embodiment.

  When gasoline is injected from the nozzle 51 of the fuel gun 50, the gas flowing through the filler pipe 40 and the inlet pipe 5 is subjected to gas phase components (air and gasoline vapor) contained in the gasoline by the gas-liquid separator 30. To be separated. The gasoline from which the gas phase components have been separated flows into the fuel tank 60 via the liquid phase outlet pipe 7. On the other hand, the separated gas phase component is guided to the gas phase outlet pipe 6. Here, gas-liquid separation by the gas-liquid separator 30 is not complete, and not a little liquid gasoline that has not been separated into the gas phase is discharged from the gas-phase outlet pipe 6.

  In the present embodiment, the gas phase outlet pipe 6 and the inlet pipe 5 are connected by a return pipe U. Further, a negative pressure is generated in the inlet pipe 5 due to the flow of gasoline flowing down. For this reason, the pressure in the portion of the inlet pipe 5 is lower than the pressure in the portion of the gas phase outlet pipe 6. Therefore, the gas-liquid two-phase flow including the gas phase (gasoline vapor or air) and the liquid phase (gasoline) discharged from the gas phase outlet pipe 6 is sucked by the negative pressure in the inlet pipe 5 and passes through the return pipe U. Then, it reaches the inlet pipe 5 and joins with the flow of gasoline flowing down the filler pipe 40 and flows into the gas-liquid separator 30. That is, a circulating flow V is naturally generated between the gas-liquid separator 30 and the return pipe U.

  As a result, the gas-liquid two-phase flow that could not be sufficiently separated by one gas-liquid separation, that is, the liquid gasoline that has flowed out to the gas-phase outlet pipe 6 side is repeatedly used in the gas-liquid separator 30. It will be subjected to gas-liquid separation. In this manner, finally, gas-liquid separation is successful, and liquid gasoline from which the gas phase has been removed can be supplied from the liquid phase outlet pipe 7 toward the fuel tank 60.

  However, here, the maximum height of the return pipe U is assumed to be h1, and the condition of h1 is considered so that the circulating flow V is naturally generated at the next refueling.

  Assuming that the pressure of the gas-liquid two-phase flow in the gas-phase outlet pipe 6 is P1, and the head pressure of the gas-liquid two-phase flow at an arbitrary height in the return pipe U is P2, the circulation flow V is natural when P1> P2. This is a condition for occurrence. That is, it is considered that the gas-liquid two-phase flow can rise from the bottom to the top in the return pipe U having the height h1 only when the extrusion pressure P1 is higher than the head pressure P2.

  Here, since there is a relationship of the head pressure P2∝h1 (∵P2 = ρ · g · h1), the maximum head pressure P2 is when the gas-liquid two-phase flow reaches the height h1 of the return pipe U. Given to. Therefore, the maximum height h1 of the return pipe U is restricted to a height that satisfies the condition of P1> P2.

  That is, the height h1 of the return pipe U is not particularly limited, but it can be said that it is preferably as low as possible. For example, it can be said that the position where the connection member 42 is provided is more preferably in the vicinity immediately above the inlet pipe 5 of the gas-liquid separator 30. By setting it as such a position, the circulation flow V can be naturally generated more favorably at the next fueling.

  Further, the mounting position of the liquid phase outlet pipe 7 in the vertical direction is not particularly limited, but when the shut valve 70 (see FIG. 6 to be described later) is not provided in the liquid phase outlet pipe 7, the liquid reservoir 18 portion is located as high as possible. In addition, the vicinity of the outlet partition 8 is more preferable.

  This is because when the amount of remaining fuel in the fuel tank 60 decreases, gasoline flows from the liquid reservoir 18 into the fuel tank 60. As described above, the liquid reservoir 18 always keeps the amount as large as possible. This is because it is desirable.

Next, operation | movement of the oil supply system of this embodiment is demonstrated continuously with reference to FIG.
FIG. 4 is an enlarged cross-sectional view of a main part (C part) of FIG.

  The gas-liquid two-phase flow that has flowed through the return pipe U collides with the inner wall of the connecting member 42 on the breather tube 41 side.

  As shown in FIG. 4, the return pipe U is connected to the connection member 42 to one of the substantially Y-shaped branch pipes, that is, the pipe to which the breather tube 41 is connected. A filler pipe 40 is connected to the other pipe of the substantially Y-shaped branch pipe.

  That is, the return pipe U is configured to be a passage that connects the gas phase outlet pipe 6 and the inlet pipe 5 or the gas phase outlet pipe 6 and the filler pipe 40 via the connection member 42.

  The connecting member 42 and the filler pipe 40, or the connecting member 42 and the return pipe U may be configured separately or may be integrally formed as shown in FIG.

  When the gas-liquid two-phase flow circulating in the return pipe U collides with the wall of the connection member 42, the heavy liquid phase flows down vertically due to the influence of gravity, while the relatively light gas phase has a place to go. Losing and entering the breather tube 41 one after another.

  In this way, air (and gasoline vapor) passes through the breather tube 41, and air is discharged into the outside air from the vapor discharge hole 53 provided in the fuel filler port 52 (white in FIG. 4). See the drop arrow).

  In this way, during the refueling operation, while the refueling port 52 is opened, it is possible to automatically release the trapped air mixed during refueling, that is, the gas-liquid two-phase gas phase discharge.

  Further, since the vapor discharge hole 53 is provided inside the fuel filler opening 52, part of the gasoline vapor is returned to the filler pipe 40 again. This flow of steam plays a role of preventing the entrainment of new air at the time of refueling and helps the natural generation of a stronger circulation flow V.

  When the refueling operation approaches the end stage and the gasoline rises to the position of the connecting member 42, the gasoline starts to rise in the filler pipe 40 instead of in the breather tube 41.

  This is because the breather tube 41 is communicated with the atmospheric pressure via the vapor discharge hole 53 during refueling, while the breather tube 41 is blocked from communicating with the atmospheric pressure by a refueling cap (not shown).

  On the other hand, the filler pipe 40 has a fuel gun 50 inserted on the fuel filler port 52 side, which is not sealed, but is closed, and a high-speed gasoline flow from the nozzle 51 of the fuel gun 50 (solid line). This is a situation where negative pressure is generated around (see arrow).

  For this reason, the filler pipe 40 side has a lower internal pressure of the pipe than the breather tube 41 side, and is sucked in.

  Furthermore, when the liquid level of gasoline rises in the filler pipe 40 and reaches a liquid level sensor (not shown) provided in the nozzle 51 portion of the fuel gun 50, the liquid level sensor detects the liquid level of the gasoline and supplies the fuel gun. 50 fuel injection can be stopped and fuel supply can be stopped automatically.

  The vapor discharge hole 53 is desirably provided above the nozzle 51 portion of the fuel gun 50 in the fuel filler port 52 and as close to the inlet as possible.

  This is because if the nozzle 51 is installed below the nozzle 51 portion, the vapor discharge hole 53 is seen from the flow of the gasoline rather than the tip of the nozzle 51, for example, when refueling or when the gasoline is blown in too much. This is because if the gas is in the downstream position, gasoline may enter and reversely flow into the breather tube 41 from the vapor discharge hole 53, which may hinder gas phase discharge.

  Therefore, if the vapor discharge hole 53 is provided above the nozzle 51 portion of the refueling gun 50 and as close to the inlet as possible, it can be said that it is more suitable because it is not necessary to worry about this.

(Action / Effect)
The actions and effects of the present embodiment are summarized as follows.
In the fuel supply system 100 using the gas-liquid separator 30 of the present invention, a flexible fuel tank 60 is used.
In other words, the shape of the fuel tank deforms following the amount of remaining fuel, so if you can fill the interior with liquid gasoline and fill it with liquid when refueling, for example, gasoline will be consumed by engine combustion. Even in such a case, there is no room for generating fuel vapor.
As a result, conventional canisters and complicated piping systems for connecting them can be eliminated, and the effects of simplification of equipment, reduction of manufacturing processes, reduction of manufacturing costs, weight reduction of products themselves, etc. Can play.
In order to make the inside of the fuel tank 60 filled with the liquid, a known gas-liquid separator 30 focusing on the surface tension effect of gasoline is used, so that the gas-liquid separator 30 passes many times. Since the return pipe U is provided to configure the circulation system, the entrained air mixed during refueling can be reliably separated.
In addition, the gas-phase separated gas-liquid portion can be safely exhausted into the outside air from the vapor discharge hole 53 provided in the oil supply port 52 that is opened only during refueling.

(Second Embodiment)
FIG. 5 is a diagram for explaining a main configuration of an oil supply system 200 using the gas-liquid separator according to the second embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, in the second embodiment, the gas-liquid separators 30 and 31 are connected in series by a return pipe S, and further, the gas-liquid separator 31 and the connection member 42 are connected by a return pipe R. It is connected.

  Further, the liquid phase outlet pipe 7 </ b> B of the gas-liquid separator 31 is provided so as to be connected to the liquid phase outlet pipe 7 of the gas-liquid separator 30. Other configurations are the same as those in the first embodiment. In addition, when providing the shut valve 70 (refer FIG. 6 mentioned later as a reference figure) in 2nd Embodiment, the fuel tank 60 side rather than the connection part of the liquid phase exit pipes 7 and 7B among the liquid phase exit pipes 7 is provided. What is necessary is just to provide in this position.

  Although the gas-liquid separators 30 and 31 use the same type, they may be formed by mixing and mixing surface tension type gas-liquid separators of different sizes as appropriate. Further, the number of units connected in series is not limited to two, and a configuration in which a plurality of units are connected in series may be used.

  Further, in FIG. 5, the liquid phase outlet pipe 7B is drawn in a shape that rises up and down for the convenience of drawing on the paper surface. However, in reality, the liquid phase outlet pipe 7B bypasses the gas-liquid separator 30 in the horizontal plane. It is attached to wrap around to the side. Here, the wraparound direction may be within a horizontal plane on the front side of the sheet.

  Even if comprised in this way, the effect similar to 1st Embodiment can be acquired. If comprised in this way, it will be subjected to gas-liquid separation twice while circulating the circulating flow W for 1 round, and efficiency is good. In particular, the present invention is more suitable when applied to a large-sized transportation device having a limited installation space, such as a truck, a trailer, a ship, and an aircraft.

(Modification)
Next, a modification of the first embodiment and the second embodiment will be described with reference to FIG.

  As a modification of the first embodiment and the second embodiment, the liquid-phase outlet pipe 7 of the gas-liquid separator 30 (the liquid-phase outlet pipe 7 after merging with the liquid-phase outlet pipe 7B in the second embodiment), A shut valve 70 may be provided between the fuel tank 60. The shut valve 70 is a valve that blocks communication between the liquid phase outlet pipe 7 and the fuel tank 60. FIG. 6 illustrates the case where the shut valve 70 is installed in FIG. 1 (first embodiment).

  When such a shut valve 70 is installed, for example, the opening and closing of the shut valve 70 is performed by, for example, letting the amount of liquid in the liquid reservoir 18 (see FIG. 2) of the gas-liquid separator 30 (see FIG. 2) during refueling from the liquid phase outlet pipe 7. Measured by a sensor (not shown) provided at a higher position, the valve is opened only when it exceeds a predetermined amount, and all other conditions are closed (including when not refueling). Can be considered.

  By doing in this way, even if it is a case where the gas-liquid separator 30 and the fuel tank 60 are installed with a height difference in the vertical direction, for example, the gasoline is increased from the higher to the lower between them. Can be prevented from flowing back. Thereby, the freedom degree of the layout of apparatus arrangement | positioning can be raised.

  The shut valve 70 can be installed arbitrarily. As shown in FIG. 1, when the shut valve 70 is not installed, both devices are installed in such a positional relationship that the liquid phase outlet pipe 7 that communicates the gas-liquid separator 30 and the fuel tank 60 is horizontal. do it. By doing in this way, the installation cost of the shut valve 70 and a liquid quantity sensor can be saved. That is, it can contribute to the reduction of the manufacturing cost of the vehicle.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. For example, the pipe in the present invention is preferably a resin tube, but may be a metal pipe, and the resin tube and the metal pipe are properly used according to the place of use and mixed. Also good.

  In the second embodiment, the return pipe S that connects the gas-liquid separators 30 and 31 in series is a pipe having a substantially S-shape, but may be configured to be connected by a straight pipe. . In this case, for example, it is suitable for a car having a high vehicle height with relatively few layout restrictions in the height direction.

  Moreover, in 1st Embodiment and 2nd Embodiment, although the breather tube 41 for gaseous-phase discharge | emission is comprised as a different body from the filler pipe 40, it makes it easier to ventilate, but it is not restricted to this.

  In the case of such a configuration, it is not necessary to provide the vapor discharge hole 53 in the oil supply port 52. Moreover, since the breather tube 41 can be eliminated, the structure of the connecting member 42 can be simplified.

DESCRIPTION OF SYMBOLS 1 Gas-liquid separation chamber 2 Micro bellows groove | channel 4 Grooved body 5 Inlet pipe 6 Gas-phase outlet pipe 7, 7B Liquid-phase outlet pipe 8 Outlet partition 10 Outer body 12 Narrow space 13 Lower contraction pipe part 16 Inlet partition 18 Liquid storage 19 Inflow chamber 21 Gas phase inflow end 30, 31 Gas-liquid separator 40 Filler pipe 41 Breather tube (tube)
42 Connecting member 50 Fueling gun 51 Nozzle 52 Fueling port 53 Vapor discharge hole 60 Fuel tank 70 Shut valve 100, 200 Fueling system P1, P2 Pressure h1 Height S, R, U Return pipe (passage)
V, W Circulating flow

Claims (4)

A flexible fuel tank;
A gas-liquid separator for gas-liquid separation of a gas-liquid two-phase flow in which air is mixed with fuel into a gas phase and a liquid phase;
An inlet pipe for guiding the gas-liquid two-phase flow to the gas-liquid separator;
A liquid phase outlet pipe for guiding the liquid phase from the gas-liquid separator to the fuel tank;
Equipped with a,
The gas-liquid separator is
A gas phase outlet pipe for discharging the gas phase;
A passage that connects the gas phase outlet pipe and the inlet pipe, or a path that connects the gas phase outlet pipe and a filler pipe provided closer to the fuel filler port than the inlet pipe;
With
A connection portion between the inlet pipe or the filler pipe and the passage is provided with a tube for discharging the gas phase,
The oil supply system using a gas-liquid separator, wherein the gas phase is exhausted from the vapor discharge hole provided in the oil supply port into the outside air only at the time of oil supply. The refueling system using the gas-liquid separator according to claim 1, wherein the gas-liquid separator performs the gas-liquid separation by using a surface tension action of the fuel. 2. The fuel supply system using a gas-liquid separator according to claim 1, wherein the fuel tank is deformed so as to completely follow the amount of remaining fuel and is maintained in a state where the interior is always filled with liquid. . Said inlet pipe, said liquid phase outlet pipe, the vapor outlet tube, the passageway, the filler pipe, at least one of said tube, characterized in that it is configured to include a resin tube, to claim 1 An oil supply system using the gas-liquid separator described.

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