one-way valve

Abstract

This invention provides a one-way valve that enables smooth fuel supply and can confirm the presence or absence of holes in the fuel path. The one-way valve (10) is disposed at the connection point of the fuel injection pipe (12) connected to the fuel tank (11) and has a one-way valve plate (33) for opening and closing the flow channel from the fuel injection pipe (12) to the fuel tank (11). The one-way valve plate (33) has: a vent (41) that communicates the interior of the fuel tank (11) with the interior of the fuel injection pipe (12); and a wall (42) that extends upward from the lower side of the vent (41) and is disposed on the side of the fuel injection pipe (12) in the vent (41).

Description

Technical Field

[0001] This utility model relates to a one-way valve. Background Technology

[0002] For fuel tanks in vehicles such as automobiles, a one-way valve is installed at the connection point between the fuel filler pipe and the fuel tank to prevent backflow. However, if the fuel tank is sealed using a one-way valve, it becomes difficult to confirm the presence of an opening on the filler pipe side when a key-off pump (KOP) is used to create negative pressure in the fuel path to check if there is one in the fuel path.

[0003] Patent Document 1 discloses a technique for forming a bypass hole on the valve body of an inspection valve located at the end of the fuel tank side of the injection pipe, which communicates with the upstream and downstream sides of the inspection valve.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-16097 Utility Model Content

[0007] The problem to be solved by the utility model

[0008] According to the structure described in Patent Document 1, by forming a vent hole on the valve body that serves as a bypass hole communicating with the upstream and downstream sides of the inspection valve, it is possible to confirm whether there is an opening on the fuel injection pipe side even when the inspection valve is closed by shutting off the pump. However, because a vent hole is provided on the valve body, fuel may flow downstream through the vent hole during fuel supply, causing a decrease in fuel supply pressure. This may result in the inspection valve not being fully opened during fuel supply, thus hindering smooth fuel supply.

[0009] This invention was made in view of the above circumstances, and its purpose is to provide a one-way valve that can provide smooth fuel supply and can confirm whether there are holes in the fuel path.

[0010] Methods for solving problems

[0011] To achieve the above objectives, the one-way valve of this utility model is disposed at the connection portion of the fuel injection pipe connected to the fuel tank, and has a one-way valve plate for opening and closing the flow channel from the fuel injection pipe to the fuel tank. The one-way valve plate has: a vent hole that communicates the interior of the fuel tank with the interior of the fuel injection pipe; and a wall that extends upward from the lower side of the vent hole and is disposed on the fuel injection pipe side of the vent hole.

[0012] The one-way valve with this structure can ensure the vent hole for detecting the opening in the fuel injection pipe while suppressing the phenomenon where fuel flows in through the vent hole during fuel supply, causing a drop in fuel supply pressure and preventing the one-way valve plate from opening. This allows for smooth fuel supply and confirmation of the presence or absence of openings in the fuel path.

[0013] Utility Model Effect

[0014] According to this utility model, a one-way valve that can provide smooth fuel supply and can confirm whether there are holes in the fuel path can be provided. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a part of the fuel system of a vehicle in which a one-way valve is provided on the fuel filler pipe, as described in this embodiment.

[0016] Figure 2 This is a schematic side sectional view of the check valve involved in this embodiment.

[0017] Figure 3 This is a schematic side sectional view of the check valve involved in the reference example.

[0018] Figure 4 A schematic side sectional view of the top portion of the check valve involved in the modified example. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of a vehicle's fuel system in which the one-way valve 10 of this embodiment is provided on the fuel line 12.

[0021] like Figure 1 As shown, the one-way valve 10 involved in this embodiment is used, for example, in the fuel path of a vehicle such as an automobile.

[0022] A fuel tank 11 is mounted on the vehicle. A fuel filler pipe 12 is connected to the fuel tank 11. The fuel filler pipe 12 has a fuel inlet 13 at its end opposite to the connection side of the fuel tank 11. The fuel filler pipe 12 is a piping for supplying fuel supplied from the fuel inlet 13 through a fuel nozzle to the fuel tank 11. A one-way valve 10 is provided at the connection point of the fuel filler pipe 12 to the fuel tank 11.

[0023] The fuel tank 11 is, for example, a sealed type of fuel tank that is kept closed while the vehicle is in motion. One end of an evaporation passage 22 with a shut-off valve 21 is connected to the fuel tank 11. The other end of the evaporation passage 22 is connected to a filter canister 23. Furthermore, one end of an atmospheric passage 24 is connected to the filter canister 23, and the other end of the atmospheric passage 24 is connected near the fuel inlet 13 of the fuel filler pipe 12. Moreover, the fuel tank 11 is sealed by closing the evaporation passage 22 using the shut-off valve 21.

[0024] Figure 2 This is a schematic side sectional view of the one-way valve 10 involved in this embodiment.

[0025] like Figure 2 As shown, the one-way valve 10 has a cylindrical body portion 31 with a flange portion 32 formed on it. The body portion 31 is inserted into a mounting hole (not shown) formed on the fuel tank 11, and the flange portion 32 is fixed to the edge of the mounting hole in the fuel tank 11. Thus, the one-way valve 10 is liquid-tightly mounted relative to the fuel tank 11. Furthermore, an oil filling pipe 12 is connected to the upstream end of the fuel tank 11 located on the outside of the one-way valve 10 mounted on the fuel tank 11.

[0026] The one-way valve 10 has a one-way valve plate 33 at its downstream end, located inside the fuel tank 11, for opening and closing a flow path connecting the fuel injection pipe 12 to the fuel tank 11. This one-way valve plate 33 is supported at its lower end in the main body 31 and is configured to swing around this support point. In its normal state, the one-way valve plate 33 is positioned on the side of the main body 31, and the opening 34 on the fuel tank 11 side of the main body 31 is closed by the one-way valve plate 33.

[0027] Furthermore, a swing limiting plate 35 is fixed at the lower end of the main body 31. This swing limiting plate 35 tends towards the upper end of the main body 31 and gradually tilts away from the opening 34 of the main body 31. As a result, the one-way valve plate 33 is restricted from swinging away from the opening 34 of the main body 31 by the swing limiting plate 35. In other words, the one-way valve plate 33 is configured to swing between the opening 34 of the main body 31 and the swing limiting plate 35.

[0028] The one-way valve plate 33 has a vent 41 near its upper end. Thus, when the one-way valve plate 33 is positioned on the main body 31 side and the opening 34 is closed, the interior of the fuel tank 11 and the interior of the fuel injection pipe 12 are connected via the vent 41. The vent 41 formed on the one-way valve plate 33 is positioned above the fuel level L when the fuel tank 11 is full. Therefore, even when the fuel tank 11 is full, fuel will not flow from the vent 41 into the fuel injection pipe 12.

[0029] Furthermore, the one-way valve plate 33 has a wall 42. This wall 42 is formed in a plate shape and is integrally formed on the side of the oil injection pipe 12 in the one-way valve plate 33. The wall 42 extends upward from below the vent hole 41 in the one-way valve plate 33. Thus, the wall 42 is positioned opposite the vent hole 41 on the side of the oil injection pipe 12 relative to the one-way valve plate 33. The wall 42 gradually slopes upward and away from the one-way valve plate 33 relative to its extending direction.

[0030] In the one-way valve 10 described above, when fuel is supplied through the fuel nozzle inserted into the fuel supply port 13 of the fuel injection pipe 12, the one-way valve plate 33 is pushed towards the fuel tank 11 by the fuel supply pressure and swings. As a result, the opening 34 of the main body 31, which was closed by the one-way valve plate 33, opens, thereby allowing fuel to be fed from the fuel injection pipe 12 into the fuel tank 11.

[0031] After the fuel supply is completed, the one-way valve plate 33, which was pushed and oscillating, returns to its original position due to the disappearance of the fuel supply pressure, thereby closing the opening 34 of the main body 31. As a result, the opening 34 of the main body 31 is closed by the one-way valve plate 33, thereby suppressing the backflow of fuel in the fuel tank 11 to the fuel injection pipe 12.

[0032] Furthermore, since the one-way valve plate 33 of the one-way valve 10 has a vent hole 41, the interior of the fuel tank 11 and the interior of the fuel injection pipe 12 can be vented through the vent hole 41. Therefore, with the opening 34 of the main body 31 closed by the one-way valve plate 33, the presence or absence of an opening on the fuel injection pipe 12 side can be confirmed by using a shut-off pump.

[0033] Figure 3 This is a schematic cross-sectional view of the check valve 10R used in the example.

[0034] like Figure 3As shown, the one-way valve 10R in the reference example includes a one-way valve plate 33A without a wall 42. In the case of this one-way valve 10R, the one-way valve plate 33A also has a vent hole 41, through which air can be exchanged between the interior of the fuel tank 11 and the interior of the fuel injection pipe 12. Therefore, with the opening 34 of the main body 31 closed by the one-way valve plate 33A, the presence or absence of an opening on the fuel injection pipe 12 side can be confirmed using a shut-off pump.

[0035] However, in the one-way valve 10R described in this reference example, when fuel is supplied using the fuel nozzle inserted into the fuel supply port 13 of the fuel injection pipe 12, the fuel fed into the fuel injection pipe 12 flows into the fuel tank 11 through the vent 41. As a result, the fuel supply pressure decreases, and the one-way valve plate 33A is not sufficiently pushed towards the fuel tank 11. For example, due to the decrease in fuel supply pressure caused by the fuel flowing into the fuel tank 11 through the vent 41, the pushing force required to push the one-way valve plate 33A decreases by approximately 10%. Consequently, there is a possibility that the opening 34 of the main body 31 cannot be fully opened, causing the fuel fed into the fuel injection pipe 12 to flow backwards towards the fuel supply port 13. This would activate the automatic stop mechanism of the fuel nozzle, stopping the fuel supply and preventing sufficient fuel supply to the fuel tank 11.

[0036] In contrast, the one-way valve 10 according to this embodiment, through the wall 42, can suppress the inflow of fuel supplied to the fuel injection pipe 12 into the fuel tank 11 through the vent 41. Therefore, the phenomenon that fuel flows into the fuel tank 11 from the vent 41 during fuel supply, causing a decrease in fuel supply pressure and preventing the one-way valve plate 33 from opening, can be suppressed, thereby enabling smooth fuel supply.

[0037] Figure 4 A schematic side sectional view of the top portion of the check valve 10A involved in the modified example.

[0038] like Figure 4 As shown, the modified example of the check valve 10A includes a check valve plate 33A without a wall 42. Furthermore, in the check valve 10A, a wall portion 51 is integrally provided on the inner surface of the upper part of the main body 31. The wall portion 51 is disposed on the side of the oil injection pipe 12 in the check valve plate 33A. This wall portion 51 extends downwards, and its lower end reaches a position below the vent hole 41 in the check valve plate 33A. Thus, the wall portion 51 is disposed at a position opposite to the vent hole 41 of the check valve plate 33A on the side of the oil injection pipe 12.

[0039] In the case of the one-way valve 10A involved in this modified example, the one-way valve plate 33A also has a vent 41, and the interior of the fuel tank 11 can be vented through the vent 41 to the interior of the fuel injection pipe 12. Therefore, with the opening 34 of the main body 31 closed by the one-way valve plate 33A, it is possible to use a shut-off pump to check whether there is an opening on the fuel injection pipe 12 side.

[0040] Furthermore, by modifying the one-way valve 10A involved in the example, the wall 51 can also be used to suppress the inflow of fuel supplied to the fuel tank 11 through the vent hole 41 into the fuel tank 11. Therefore, the phenomenon that fuel flows into the fuel tank 11 through the vent hole 41 during fuel supply, causing a decrease in fuel supply pressure and preventing the one-way valve plate 33A from opening, can be suppressed, thereby enabling smooth fuel supply.

Claims

1. A one-way valve characterized by, It is provided at a connection portion connected to a fuel tank in a filler pipe connected to the fuel tank, and has a one-way valve plate that opens and closes a flow passage from the filler pipe to the fuel tank, wherein The one-way valve plate has: An air vent hole that communicates an inside of the fuel tank with an inside of the filler pipe; A wall body that extends from a lower side of the air vent hole to an upper side, and is disposed at the filler pipe side in the air vent hole.

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