JP2009078648A - Fuel vapor outflow device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance effect of suppressing fuel leakage when letting fuel vapor remaining in an upper end area inside a fuel tank outflow to the outside of a tank via a gas-liquid separator. <P>SOLUTION: An end-part duct part 50 is fitted/mounted with a fuel shielding body 52 composed of U-shaped left/right bodies 52L, 52R mutually joined/fixed at their end faces. Shielding plates 54L, 54R are projected obliquely upward from lower sides of penetration holes 53 continuing to penetration holes 51 as basic points. These shielding plates are vertically/alternately provided along a duct direction of the end-part duct part 50. The shielding plates 54L, 54R form fuel storage parts 55 at front areas of the penetration holes 53. The fuel entering the end-part duct part 50 is stored in the fuel storage parts 55, and only extra fuel exceeding the storage amount passes. The fuel vapor reaches the gas-liquid separator via vapor flow passages 56 between the shielding plates without any problem. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel vapor outflow device that causes fuel vapor staying in an upper end region inside a fuel tank to flow out of the tank via a gas-liquid separator.

  When storing fuel in the fuel tank, it is desirable to fill the entire tank with fuel. By the way, the fuel vapor stored in the tank above the fuel level must be appropriately discharged out of the tank, and a float valve is frequently used as a valve for discharging the fuel vapor. In such a float valve, since it is necessary to ensure the float stroke of the float even at the full liquid level, there is a so-called dead space at the upper end inside the tank. Various techniques have been proposed to reduce such dead space (for example, Patent Document 1).

JP 2003-286918 A

  In this patent document, the opening of a pipeline provided in the tank is positioned on the upper end side inside the tank, and the fuel vapor that has entered the pipeline from the opening is discharged out of the tank. In other words, by not providing a valve in the pipe line, the dead space is reduced by bringing the opening, that is, the pipe end part closer to the upper end inside the tank.

  In the technique proposed in this patent document, the fuel itself enters the opening together with the fuel vapor and flows through the pipeline due to the inclination of the fuel level when the vehicle travels. In this way, the fuel vapor and the fuel flowing through the pipeline are separated into gas and liquid by the separator at the end of the pipeline, and the fuel vapor as the gas component is discharged out of the tank. For this reason, it has been pointed out that when the fuel surface is inclined or moved up and down frequently, the amount of fuel that reaches the separator increases, and fuel leaks more easily downstream of the separator.

  In view of the above-described problems, an object of the present invention is to improve the effect of suppressing fuel leakage when fuel vapor staying in the upper end region inside a fuel tank flows out of the tank via a gas-liquid separator. .

  In order to achieve at least a part of the above object, the present invention adopts the following configuration.

[Application: Fuel vapor spill device]
A fuel vapor outflow device for flowing out fuel vapor staying in the upper end region inside the fuel tank to the outside of the tank via a gas-liquid separator,
A steam introduction line arranged in a tank to introduce the staying fuel vapor into the gas-liquid separator;
The steam inlet line is
An end pipe section including a steam inflow opening is positioned in the inner upper end region, and in the end pipe section, while storing liquid-phase fuel that has entered the pipe from the steam inflow opening in the pipe, A fuel shielding mechanism for allowing vapor phase fuel vapor entering the pipeline from the vapor inlet opening to pass through the pipeline;
A gist of the invention is that the fuel shielding mechanism has a discharge passage for discharging the fuel stored in the pipe of the end pipe section into the fuel tank.

  In the fuel vapor outflow device having the above-described configuration, the end pipe line portion of the steam introduction pipe line arranged in the tank is positioned in the upper end area inside the fuel tank, and the vapor inflow opening of the pipe line section extends from the upper end area inside the tank. Fuel vapor is introduced into the gas-liquid separator. When the fuel level in the fuel tank is inclined, etc., the fuel itself and the fuel vapor flow through the steam inlet pipe from the steam inlet opening. The fuel introduced in this way has the steam inlet pipe in the end pipe section. By the fuel shielding mechanism, it is stored in the pipeline, and the fuel vapor reaches the gas-liquid separator through the end pipeline section and the downstream pipeline. Even in the fuel that flows into the steam introduction pipe along with the fuel vapor, if it exceeds the amount stored in the pipe of the end pipe section, it will reach the gas-liquid separator via the end pipe section. The amount is reduced by the amount stored in the pipe of the end pipe by the fuel shielding mechanism. Therefore, since the amount of fuel reaching the gas-liquid separator can be reduced, it is difficult for fuel to leak downstream from the gas-liquid separator, and the effect of suppressing fuel leakage to the outside of the tank is enhanced. Moreover, since the fuel stored in the pipe line of the end pipe part is discharged into the fuel tank by the discharge path and returns to the tank, the amount of fuel reaching the gas-liquid separator can be made smaller. The effect of suppressing fuel leakage is further increased. In this case, it is preferable that the discharge path is disposed below the vapor flow path through which the fuel shielding mechanism allows the fuel vapor to pass, so that the stored fuel can be reliably returned to the tank. In addition, since the end pipe line part of the steam introduction pipe line is located in the internal upper end region of the fuel tank, the dead space in the fuel tank is reduced.

  The fuel vapor outflow device described above can be configured as follows. For example, the steam passage through which the fuel shielding mechanism allows the fuel vapor to pass can be made to have a passage area corresponding to a tubular passage area having a diameter of 1.5 to 3 mm. In this way, the vapor-phase fuel vapor can be surely passed, but the liquid-phase fuel is restricted by the passage of the vapor flow path, so the reliability of reducing the amount of fuel reaching the gas-liquid separator is increased.

  In addition, the gas-liquid separator is provided in the fuel tank, and the vapor-phase fuel vapor separated by the gas-liquid separator is separated from the gas-liquid separator to the outside of the fuel tank by a vapor outlet line. The liquid fuel separated and separated by the gas-liquid separator can be discharged from the gas-liquid separator to the fuel tank by a fuel discharge system. By so doing, it is possible to provide a fuel tank with an improved fuel leakage suppression effect.

  Further, the fuel shielding mechanism includes a plate-like shield projecting obliquely upward so as to obliquely block the pipe line of the end pipe portion, and the fuel flow is blocked by the shield while blocking the fuel flow. The fuel can be stored on the shield, and at least two or more of the shields can be combined to form a bent channel, and the fuel vapor can pass through the bent channel. For example, the shields can be alternately installed while being vertically separated along the pipe line direction of the end pipe line part. In this way, the flow path bends at the passage location while the gap between the lower surface of one of the alternately installed shields and the tip of the other shield member arranged alternately is the passage location of the fuel vapor. The fuel vapor can be passed through the bent channel. Therefore, it is possible to achieve a high fuel leakage suppressing effect with a simple configuration in which the shielding bodies projecting obliquely upward are arranged vertically and alternately.

  As another fuel shielding mechanism, a plate-like shield that obliquely blocks the pipe of the end pipe section is provided in the pipe direction of the end pipe section without overlapping the openings of the shield. It can be arranged in multiple stages along. In this way, since each shield is oblique, fuel is stored at the lower end side of the shield while blocking the flow of fuel with the shield itself, and the opening of each shield is used as a passage for fuel vapor, The fuel vapor can be passed through a bent flow path in which the flow path is bent at the opening. Therefore, it is possible to achieve a high fuel leakage suppressing effect with a simple configuration in which the shielding body having the opening is arranged in multiple stages so as to obliquely block the pipe line of the end pipe line part.

  Further, as another fuel shielding mechanism, a plurality of shielding bodies having a cap shape and having an opening at the top of the top of the cap are provided, and the plurality of the shielding bodies are arranged in the pipe direction of the end pipe section without overlapping the openings. It can be arranged vertically. If it carries out like this, fuel will be stored on the shade peripheral side of the said shielding body, blocking the fuel flow with the shade slope of each said shielding body, and the said opening can be made into the passage location of fuel vapor | steam. Therefore, it is possible to achieve a high fuel leakage suppression effect with a simple configuration in which the cap-shaped shield having an opening at the top is arranged vertically so that the openings do not overlap.

  In achieving the function of the fuel shielding mechanism using such a shielding body, the fuel shielding mechanism having the shielding body is provided separately from the end pipe line portion, and the separate fuel shielding mechanism is provided at the end. It can be inserted into the pipe line of the part pipe line part. In this way, a fuel vapor outflow device having a high effect of suppressing fuel leakage can be obtained by a simple method of inserting a fuel shielding mechanism. In other words, it can be modified to a fuel vapor outflow device having a high effect of suppressing fuel leakage by a simple method of inserting a fuel shielding mechanism into a vapor introduction pipe line in an existing fuel vapor outflow device.

  Hereinafter, embodiments of the present invention will be described based on examples. FIG. 1 is an explanatory view for schematically explaining the configuration of a fuel vapor outflow device 10 as an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the main part of the fuel vapor outflow device 10 denoted by reference numeral A in FIG. It is explanatory drawing shown.

  As shown in the figure, the fuel vapor outflow device 10 is incorporated in a fuel tank T and includes a gas-liquid separation unit 20 and a pump 30. The gas-liquid separation unit 20 includes an unillustrated plate, and is an assembly product in which a gas-liquid separator 22, a steam cutoff valve 24, a pipe opening / closing valve 26, and a check valve 28 are attached and fixed to the plate. The gas-liquid separator 22 receives the introduction of fuel vapor and fuel that have passed through a vapor introduction pipe 40 described later and reached the gas-liquid separator 22, and separates the fuel vapor as a gas component and the fuel as a liquid component. (Gas-liquid separation). The gas-liquid separator 22 can cause the fuel vapor separated from the gas and liquid to flow out to the vapor discharge line 23 leading to the canister C outside the tank, and the fuel separated into gas and liquid can flow out from the discharge line 31 leading to the pump 30. And

  The fuel vapor that has flowed out of the gas-liquid separator 22 into the steam discharge pipe 23 reaches the canister C through the valve operation of the steam cutoff valve 24 and the pipe opening / closing valve 26 of the pipe, and the canister C After being absorbed, it is released to the atmosphere. The steam shut-off valve 24 has a float valve configuration using a float that floats according to the fuel liquid level, and closes when the fuel liquid level in the tank becomes high to close the pipe of the steam discharge pipe 23. The pipe opening / closing valve 26 has a float valve structure using a float that floats and sinks according to the fuel liquid level and a relief valve structure that opens and closes according to the pressure. And opening the pipeline when the tank internal pressure rises. The fuel gas-liquid separated by the gas-liquid separator 22 is sucked by the pump 30, passes through the discharge pipe 31, and returns to the tank through the pump discharge port 32. In this case, the check valve 28 in the discharge pipe 31 prevents the fuel from flowing into the gas-liquid separator 22 side.

  In addition, the fuel vapor outflow device 10 of this embodiment includes two systems of steam introduction pipes 40 for introducing steam into the gas-liquid separator 22 on the upper end side of the tank. 1 is disposed in the upper end region inside the fuel tank T, and the end pipe section 50 at the front end of the pipe is disposed on the end side of the fuel tank T in FIG. As shown in detail in FIG. 2, the end pipe portion 50 is positioned such that the steam inflow opening 50 a faces the tank upper end side inner wall TS of the fuel tank T. In this embodiment, since the position of the steam introduction pipe 40 is set lower than the full liquid level FL in the fuel tank T, the steam introduction pipe 40 allows the fuel vapor staying in the upper end region inside the tank to flow into the end pipe. The gas is taken in from the vapor inflow opening 50 a of the passage 50 and introduced into the gas-liquid separator 22. In this case, the introduction of the fuel vapor into the gas-liquid separator 22 occurs as the tank internal pressure increases, and if the fuel liquid level is inclined at that time, the fuel in the tank also enters the vapor inflow opening 50a together with the fuel vapor. It flows in and reaches the gas-liquid separator 22 through the end pipe section 50 and the steam introduction pipe 40. The passage behavior of the fuel and the fuel vapor in the end pipe section 50 will be described later.

  Here, the end pipe line part 50 will be described. FIG. 3 is an explanatory view showing the end pipe section 50 in an exploded manner according to the present embodiment, and FIG. 4 is an explanatory view for explaining the passage behavior of fuel and fuel vapor in the end pipe section 50.

  As shown in the drawing, the end pipe section 50 is formed into a quadrangle by expanding the tip of the steam introduction pipe 40, and has two through holes 51 on the opposite side surfaces, and a fuel shield 52. To be fitted. The fuel shield 52 is formed by joining and fixing a U-shaped left main body 52L and a right main body 52R at end surfaces, and the left main body 52L and the right main body 52R are connected to the end pipe line portion 50 with a fuel shield. A through-hole 53 that matches the through-hole 51 when the 52 is fitted and mounted is provided. Each of the left main body 52L and the right main body 52R includes shielding plates 54L and 54R that protrude obliquely upward with the lower side of the through hole 53 as a base point. Since the shielding plates 54L and 54R are also joined to the side walls of the left main bodies 52L and 52R, the fuel storage portion 55 is formed in the front region of the through hole 53 together with the side walls. Further, the shielding plates 54L and 54R are arranged in the pipe direction of the end pipe section 50 (vertical direction in the figure) when the left main bodies 52L and 52R are joined and fixed at the end faces thereof as shown in FIG. As shown in the drawing, the gap between the lower surface of the shielding plate 54L and the tip of the shielding plate 54R positioned below is defined as a steam flow path 56. The steam channel 56 is located above the through-hole 51 and the through-hole 53 as shown in the figure, and the channel shape is an elongated slit, but the channel area is a tubular flow of Φ1.5 to 3 mm. The area is equivalent to the road area.

  The behavior of fuel vapor and fuel passing in the fuel vapor outlet apparatus 10 of the present embodiment having the above-described configuration is as follows. First, the case where the fuel level in the fuel tank T is the same as or lower than the full liquid level FL shown in FIG. 2 and there is no significant fluctuation in the fuel level will be described. In such a state, the fuel vapor existing in the tank inner region below the tank upper end inner wall TS, that is, the inner upper end region of the tank, enters the vapor inflow opening 50a of the end pipe portion 50 as the tank internal pressure increases, In the end pipe section 50, the steam flow path 56 formed by the shielding plates 54L and 54R is sequentially passed to the steam introduction pipe 40 and reaches the gas-liquid separator 22 (see FIG. 1). That is, the fuel vapor flows through the flow path bent by the vapor flow path 56 and is introduced into the gas-liquid separator 22. Then, after the gas-liquid separator 22 performs gas-liquid separation, the fuel component is removed by the canister C through the steam discharge pipe 23 and released to the atmosphere. In such a state, there is no large fluctuation in the fuel liquid level, and since the gap between the tank upper end side inner wall TS and the end pipe line portion 50 is small, the fuel in the tank hardly enters the vapor inflow opening 50a. Therefore, fuel leakage does not occur if the tank is inadvertent.

  Now, when the fuel level of the fuel tank T tilts or rises and falls due to turning or sudden braking of the vehicle, the fluctuation of the fuel level also increases, so the gap between the tank upper end side inner wall TS and the end pipe section 50 is small. Nevertheless, the fuel may enter the steam inlet opening 50a together with the fuel vapor. Thus, the fuel that has entered the steam inflow opening 50a is blocked from flowing downstream by the uppermost shielding plate 54L in the end pipe portion 50, and is stored in the fuel storage portion 55 formed by the shielding plate. Moreover, the fuel stored in the fuel storage portion 55 in this way passes through the through hole 53 and the through hole 51 and is returned to the tank. In this case, such fuel inflow occurs due to large fluctuations in the fuel level. However, since the fuel level is not always above the through hole 51, the fuel flows into the tank through the above-described through hole. A return happens.

  The fuel exceeding the capacity of the fuel reservoir 55 in the uppermost shielding plate 54L flows downstream from the front end of the shielding plate 54L, but the downstream inflow is blocked by the next shielding plate 54R. While being stored in the fuel storage portion 55 formed by the shielding plate, it passes through the through hole 53 and the through hole 51 and is returned to the tank. Since this is repeated also by the shielding plate 54L and the shielding plate 54R of the next stage, most of the fuel flowing into the end pipe portion 50 from the steam inflow opening 50a is stored in the fuel storage portion 55 and the through hole. The return to the inside of the tank after passing through is prevented from passing through the steam flow path 56 in the end pipe section 50 and reaching the steam introduction pipe 40. Therefore, the amount of fuel that reaches the gas-liquid separator 22 from the steam introduction line 40 is simply arranged with the end of the steam introduction line 40 in the vicinity of the tank upper end inner wall TS without having the end line part 50. This is much less than if you do. As a result, according to the fuel vapor outflow device 10 of the present embodiment having the above-described configuration, the dead space of the fuel tank T is reduced by arranging the end pipe line portion 50 close to the tank upper end side inner wall TS. The effect of suppressing fuel leakage downstream of the gas-liquid separator 22 can be enhanced through a reduction in the amount of fuel reaching the gas-liquid separator 22.

  Further, in the fuel vapor outflow apparatus 10 of the present embodiment, in addition to the gas-liquid separation unit 20 having the gas-liquid separator 22, the pump 30 for returning the fuel separated by the gas-liquid separator 22 into the tank is also provided in the tank. Installed inside. Therefore, it is possible to easily provide the fuel tank T in which the effect of suppressing fuel leakage is enhanced by the end pipe line part 50 described above.

  Further, in the present embodiment, when the fuel shield 52 fitted to and attached to the end pipe section 50 performs the fuel storage function, the shield plates 54L and 54R are directed obliquely upward from the wall surfaces of the left main bodies 52L and 52R. These are merely installed vertically and alternately along the pipe line direction of the end pipe part 50. That is, the fuel vapor outflow device 10 having a high suppression effect of fuel leakage can be obtained with a simple configuration of oblique projections of the shielding plates and upper and lower alternate arrangements.

  In addition, since the high fuel leakage suppression effect can be exhibited simply by fitting the fuel shield 52 to the end pipe portion 50, the fuel leakage suppression effect can be achieved by a simple method of fitting and mounting the fuel shield 52. Therefore, it is possible to obtain the fuel vapor outflow device 10 having a high value. This is a simple method of fitting and mounting the fuel shield 52 after the tip of the steam introduction pipe 40 in the existing fuel vapor outflow apparatus is shaped like the end pipe section 50. This means that the fuel vapor outflow device can be modified to one that has a high effect of suppressing fuel leakage.

  Next, a modified example will be described. FIG. 5 is an explanatory view for explaining the end pipe section 150 of a modified example in which the end pipe section 50 has a cylindrical shape and is directly attached with a shielding plate in a perspective view and a plan view. FIG. It is explanatory drawing for demonstrating the manufacturing method, seeing the edge part pipeline part 150 shown in FIG.

  As shown in the figure, the end pipe section 150 of this modification is formed in a cylindrical shape by expanding the tip of the steam introduction pipe 40, and is similar to the through hole 51 in the end pipe section 50. The upper and lower through-holes 151 are provided opposite to each other. Also, disk-shaped shielding plates 154L and 154R projecting obliquely upward from the lower side of the through hole 151 are provided on the upper and lower sides, and these are alternately arranged as described above. These shielding plates 154L and 154R are inserted from the outside of the end pipe section 150 into the insertion grooves 152L and 152R formed in the side wall of the end pipe section 150 from the outside, and are fixed in a watertight manner. In this case, since the formation trajectories of the insertion grooves 152L and 152R are obliquely upward, the shielding plates 154L and 154R are arranged vertically and alternately along the pipe line direction of the end pipe line part 150.

  Even in the end pipe section 150, as with the end pipe section 50 described above, fuel is introduced into the gas-liquid separator 22 and fuel is stored by the shielding plates 154L and 154R. The amount of fuel that reaches the gas-liquid separator 22 can be reduced by placing or returning to the tank through the through-hole 151. Therefore, the effect of suppressing fuel leakage is also increased.

  FIG. 7 is an explanatory view showing a sectional view of an end pipe section 160 of another modification, and FIG. 8 is a schematic perspective view of a shield 170 used in the end pipe section 160. This modification is characterized in that the shielding body 170 is arranged in multiple stages in the upper and lower directions in the pipe line direction of the end pipe section 160 and the opening 172 on the top of the shielding body 170 is not overlapped. is there.

  In this modification, the end pipe section 160 is formed in a cylindrical shape by expanding the tip of the steam introduction pipe 40, and includes four through holes 151 arranged vertically, and each through hole Are provided with multi-stage annular recesses 162 below. The shield 170 is formed in a shade shape in which the top portion is eccentric from the center, is provided with a circular opening 172 having a diameter of about 1.5 to 3 mm in the top portion of the shade, and has a circular shape on the periphery of the inclined surface 174 from the top of the shade. A flange portion 175 is provided. Since this shield 170 is a resin molded product, it can be deformed in a shade shape so that the height of the shade is extended. The flange portion 175 is inserted into the place 162 and attached to the end pipe line portion 160. When the shields 170 are mounted in the respective recesses 162, the openings 172 are not overlapped in the upper and lower shields 170.

  In the end pipe section 160, the fuel vapor entering from the upper end opening sequentially passes through the openings 172 in the shields 170 of the respective stages and reaches the steam introduction pipe 40, as described above. The separator 22 is introduced without any trouble. That is, the fuel vapor flows through the flow path bent at the opening 172 and is introduced into the gas-liquid separator 22. On the other hand, the fuel that has entered the end pipe section 160 from the upper end opening together with the fuel vapor is first blocked by the uppermost shield 170 and stored on the slope of the inclined surface 174, while passing through the through hole. 151 returns to the tank. Then, the fuel exceeding the storage amount by the inclined surface 174 of the uppermost shield 170 passes through the opening 172 and flows to the next shield 170. At this time, since the opening 172 does not overlap in the upper and lower shields 170 as described above, the fuel that has passed through the opening 172 is again blocked by the inclined surface 174 of the lower shield 170, and this is done for each stage. Is repeated. Therefore, even in the fuel vapor outflow device having the end pipe line portion 160, the effects described above can be obtained.

  FIG. 9 is an explanatory view showing the end pipe line portion 180 of another modification in a cross-sectional view and in a plan view. In this modified example, the plate-like shields 184 are arranged in multiple stages in the pipeline direction so as to obliquely shield the pipe line of the end pipe part 180, and then the row of openings 186 in each shield 184. It is characterized by the fact that they do not overlap.

  In this modified example, the end pipe section 180 is formed into a quadrangle by extending the tip of the steam introduction pipe 40, and includes four through holes 151 arranged one above the other. Slits 182 extending diagonally upward from below to the other side are provided in multiple rows. The shield 184 has a plate shape, is fitted into the slit 182 and includes a row of openings 186. In this case, as can be seen in a plan view, the openings 186 in the respective shields 184 are formed so as not to overlap with each other, and the uppermost shield 184 is positioned close to the through hole 151. Yes. In this case, the total area of the individual openings of the row of openings 186, that is, the flow path area, is approximately the same as the area of a single circular opening having a diameter of Φ1.5 to 3 mm.

  In the end pipe section 180, the fuel vapor that has entered from the upper end opening sequentially passes through the openings 186 in the shields 184 of the respective stages and reaches the steam introduction pipe 40, as described above. The separator 22 is introduced without any trouble. That is, the fuel vapor flows through the flow path bent at the opening 186 and is introduced into the gas-liquid separator 22. On the other hand, the fuel that has entered the end pipe portion 180 from the upper end opening together with the fuel vapor is first blocked by the uppermost shielding body 184 and stored in the inclined shielding body itself, while penetrating. It is returned to the tank through the hole 151. Then, the fuel exceeding the storage amount by the uppermost shield 184 passes through the opening 186 and flows to the next shield 184. At this time, since the opening 186 does not overlap the upper and lower shields 184 as described above, the fuel that has passed through the opening 186 is blocked again by the lower inclined shield 184, and this is the case for each stage. Repeated. Therefore, even in the fuel vapor outflow device having the end pipe line portion 180, the effects described above can be obtained.

  Moreover, in the end pipe section 180, the opening 186 is located on the through hole 151 side in the uppermost shield 184, and the opening 186 is separated from the through hole 151 side in the lower shield 184. Therefore, the fuel that has flowed down from the opening 186 of the upper shield 184 to the lower shield 184 and has been stored by the lower shield 184 is shielded by the lower shield before being stored. There is no flow from the opening 186 of the body 184. For this reason, fuel storage by the shield 184 at each stage is ensured.

  As mentioned above, although the embodiment of the present invention has been described in the embodiments, the present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes without departing from the gist thereof. Is possible. For example, in the rectangular end pipe section 50 shown in FIGS. 2 to 3, the shielding plates 54 </ b> L and 54 </ b> R are slanted from the outside to the end pipe section 50 like the end pipe section 150 of FIG. 6. It is possible to arrange the upper and lower parts alternately in the upper and lower directions. In the end pipe line parts 150 and 160 shown in FIGS. 6 and 7, a separate fuel shield 52 is fitted and mounted following the end pipe line part 50. It can also be done.

  In addition, in the fuel vapor outflow apparatus 10 of FIG. 1, the two steam introduction conduits 40 are used, but a configuration having one (one) steam introduction conduit 40 may be employed.

  In addition, the end pipe line portion 180 shown in FIG. 9 can take various forms in addition to the openings 186 being arranged in a line. FIG. 10 is an explanatory view for explaining the mode of the opening 186. As shown in the drawing, the opening 186 can be a single opening (FIG. 10A) in each stage of the shield 184 (FIG. 10A), or can be a long hole-shaped opening 186 (FIG. 10B). ). In addition, in FIG. 10A, a plurality of openings 186 can be provided in the shield 184 at a certain stage, or the long hole-shaped openings 186 can be arranged obliquely in FIG. 10B.

It is explanatory drawing which illustrates typically the structure of the fuel vapor outflow apparatus 10 as an Example of this invention. It is explanatory drawing which shows the principal part of the fuel vapor outflow apparatus 10 which attached | subjected the code | symbol A in FIG. It is explanatory drawing which decomposes | disassembles and shows the edge part pipe part 50 of a present Example. It is explanatory drawing for demonstrating the passage behavior of the fuel and fuel vapor | steam in the edge part pipe part 50. FIG. It is explanatory drawing explaining the end part pipe line part 150 of the modification which mounted | worn with the shielding board directly after making the shape of the end pipe part 50 into a cylinder shape by a perspective view and planar view. It is explanatory drawing for demonstrating the manufacturing method, seeing the edge part pipeline part 150 shown in FIG. 5 in cross section. It is explanatory drawing which shows the end part pipe line part 160 of another modification in sectional view. 4 is a schematic perspective view of a shield 170 used in an end pipe line section 160. FIG. It is explanatory drawing which shows the edge part pipeline part 180 of another modification by a cross sectional view and planar view. It is explanatory drawing explaining the aspect of the opening 186 which the edge part pipe line part 180 of a modification can take.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel vapor outflow apparatus 20 ... Gas-liquid separation unit 22 ... Gas-liquid separator 23 ... Steam discharge pipe 24 ... Steam cutoff valve 26 ... Pipe on-off valve 28 ... Check valve 30 ... Pump 31 ... Discharge pipe 32 ... Pump discharge port 40 ... Steam introduction conduit 50 ... End conduit portion 50a ... Steam inlet opening 51 ... Through hole 52 ... Fuel shield 52L ... Left body 52R ... Right body 53 ... Through hole 54L ... Shield plate 54R ... Shield plate DESCRIPTION OF SYMBOLS 55 ... Fuel storage part 56 ... Steam flow path 150 ... End part pipe part 151 ... Through-hole 152L, 152R ... Insertion groove 154L ... Shielding plate 160 ... End part pipe part 162 ... Recess 170 ... Shielding body 172 ... Opening 174 ... Inclined surface 175 ... Flange part T ... Fuel tank C ... Canister FL ... Full liquid level TS ... Tank upper side inner wall

Claims (9)

A fuel vapor outflow device for flowing out fuel vapor staying in the upper end region inside the fuel tank to the outside of the tank via a gas-liquid separator,
A steam introduction line arranged in a tank to introduce the staying fuel vapor into the gas-liquid separator;
The steam inlet line is
An end pipe section including a steam inflow opening is positioned in the inner upper end region, and in the end pipe section, while storing liquid-phase fuel that has entered the pipe from the steam inflow opening in the pipe, A fuel shielding mechanism for allowing vapor phase fuel vapor entering the pipeline from the vapor inlet opening to pass through the pipeline;
A fuel vapor outflow device comprising: a discharge passage for discharging the fuel stored in the pipe of the end pipe section into the fuel tank by the fuel shielding mechanism.   2. The fuel vapor outflow device according to claim 1, wherein the discharge path is disposed below a vapor flow path through which the fuel shielding mechanism allows the fuel vapor to pass.   2. The steam flow path through which the fuel shielding mechanism allows the fuel vapor to pass is configured such that the flow path area corresponds to a tubular flow path area having a diameter of 1.5 to 3 mm. Fuel vapor spill device. The fuel vapor outflow device according to any one of claims 1 to 3,
While providing the gas-liquid separator in a fuel tank,
A vapor outflow line for allowing the gas-phase fuel vapor separated by the gas-liquid separator to flow out of the fuel tank from the gas-liquid separator;
A fuel vapor outflow device comprising: a fuel discharge system that discharges liquid phase fuel separated by the gas-liquid separator from the gas-liquid separator to the fuel tank. The fuel vapor outflow device according to any one of claims 1 to 4,
The fuel shielding mechanism includes:
A plate-shaped shield projecting obliquely upward so as to obliquely block the pipe line of the end pipe section is provided, and fuel is stored on the shield while blocking the flow of fuel by the shield. In addition, a fuel vapor outflow device that combines at least two or more of the shields to form a bent flow path and allows the fuel vapor to pass through the bent flow path.   The plate-like shields protrude obliquely upward from the pipe wall surface of the end pipe part, and are alternately installed while being separated vertically along the pipe direction of the end pipe part. The fuel vapor outflow device according to claim 5.   6. The fuel vapor outflow according to claim 5, wherein each of the plate-shaped shields has an opening, and the openings are arranged in multiple stages along the pipe line direction of the end pipe part without overlapping the openings. apparatus. The fuel vapor outflow device according to any one of claims 1 to 4,
The fuel shielding mechanism includes:
A plurality of shields each having a shade shape and having an opening at the top of the shade top, wherein the plurality of shields are arranged vertically along the pipeline direction of the end pipeline portion without overlapping the openings. Steam spill device. A fuel vapor efflux device according to any one of claims 5 to 8,
The fuel shielding mechanism having the shielding body is provided separately from the end pipe section, and the separate fuel shielding mechanism is inserted into the pipe of the end pipe section. .

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