KR100192482B1 - A device of fuel leakage preventing for fuel tank - Google Patents

Abstract

The present invention relates to a fuel leakage preventing device for preventing the leakage of fuel through the evaporation tube for sending the boil-off gas generated in the fuel tank to the canister. According to the present invention, a net portion 29 having a sealing surface 29a is formed on an upper portion of the body 20 on which a plurality of through holes 21, 22, and 23 are formed, and a lower portion of the body 20 has a rectangular parallelepiped ( 31) is installed, extending upward from the lower portion of the body 20 to the inside thereof, a stopper 28 having a through hole 28a is formed in the center thereof, and a stopper 28 at the lower end of the stopper 28. The base 32 is provided with an extension 32a extending in the direction of the floating body 31 through the through hole 28a and a support protrusion 32b for supporting the spring 33. On the base 32, a sealing means 34 supported by the spring 33 and for opening and closing the sealing surface 29a of the seal neck portion 29 is provided. In addition, a rib 25 is formed at a connection portion with the reservoir 5 at the upper portion of the net portion 29 of the body 20, and the rib 25 has an inclined upper end surface through which the evaporation gas passes. 27) is formed. Then, on the inclined surface of the rib 25, a metal ball 40, which is a heavy body, is mounted to press the push bar 37 of the sealing means 34 to separate the sealing means 34 and the sealing surface 29a so that the evaporated gas is released. It is configured to open a passage for passage.

Accordingly, the fuel content in the tank 1 is prevented from flowing into the canister 7 through the evaporation pipe 4 during the fueling, the vehicle vibration or the turning, thereby reducing the content of harmful gas in the exhaust gas. I have it.

Description

Fuel leak prevention device of fuel tank

The present invention relates to a fuel tank of an automobile, and more particularly to a fuel leakage preventing device for preventing the outflow of fuel through the boil-off gas pipe for sending the boil-off gas to the canister.

Typical gasoline engine fuel systems include fuel tanks, fuel pumps, fuel filters, fuel boil-off emissions suppressors, and carburettors. In addition, the flow path of the fuel from a fuel tank to a carburettor is generically called a fuel system.

The construction of a typical fuel system is schematically shown in FIG.

The fuel tank 1 is a device for storing fuel and supplying fuel to the carburetor 8, but is not shown in detail, but a panel and a fuel flow meter for suppressing fluctuations or flow of fuel while driving are installed. Refueling pipe (2) for receiving fuel from the feeder, feed pipe (3) for supplying fuel to the carburetor (8), evaporation pipe (4), reservoir for sending the boil-off gas of the fuel to the canister (7) 5) A return 6 of the liquefied fuel is provided. The fuel stored in the fuel tank 1 is supplied to the carburetor 8 through a filter by a fuel pump (not shown), mixed with air in the intake pipe, and supplied to the cylinder 9 of the engine.

On the other hand, harmful gases emitted from automobiles include carbon monoxide (CO), hydrocarbons (HC), nitrogen carbides (NOx), and the like. Since hydrocarbons are mainly generated in the fuel tank 1 and the carburetor 8, the fuel tank 1 The hydrocarbon generated in the carburetor 8 is accumulated in the canister 7, absorbed and stored in the activated carbon inside, and introduced into the carburetor 8 during operation or discharged to the outside of the vehicle.

In particular, in order to prevent the liquid fuel from flowing into the evaporation tube 4 when the vehicle is vibrated, refueled or swiveled or rolled over, the liquid fuel is accumulated in the canister 7 to deteriorate the performance of the canister 7 or be discharged to the outside. In the evaporation tube 4 connected to the canister 7, an ORVR VENT VALVE having an evaporation gas discharge valve is installed.

2 shows a configuration of a conventional fuel leakage preventing apparatus.

As shown, the conventional fuel leakage preventing device is installed at the lower end of the reservoir (5) in communication with the evaporation tube (4) and extends into the tank (1). The fuel leakage preventing device is provided on the base 14 and the base 14 which are placed on the upper part of the ball 13 and the ball 13 in the cylindrical body 10 having a plurality of through holes 11 and 12 on the side. It consists of a floating body 16 which is supported upward through the compression coil spring (15). On the other hand, the upper portion of the body 10 is formed with a venturi tube-shaped net portion 18 is formed in contact with the floating body 16 is in contact with the floating body 16 is formed with a sealing surface 17 for blocking the leakage of fuel. have.

On the other hand, the evaporation tube 4 is the evaporation gas introduced through the plurality of through holes (11, 12) formed in the body 10 of the fuel leakage preventing device to fill the gap between the side of the body 16 and the body 10. Passed through the evaporation tube (4) to the canister (7).

Therefore, since the interval between the floating body 16 and the body 10 should have a constant interval to provide a passage of the boil-off gas, the floating body 16 swings left and right on the base 14 in accordance with the shaking of the vehicle during fueling or driving. Done. In particular, due to the fluctuation of the oil surface during oiling, the sealing state between the floating body 16 and the sealing surface 17 is partially poor, so that even if the fuel flows around the floating body, the liquid can not be properly blocked, so that the liquid fuel can the canister 7. There is a problem with the sealing function introduced.

In addition, even when the vehicle is turning, the floating body 16 is inclined to open the sealing surface on one side, and thus there is a problem in the overall fuel leakage prevention effect, such as a possibility of fuel leakage.

In particular, the outflow of fuel fills the canister with fuel, thereby preventing the absorption of hydrocarbons, thereby increasing the content of hydrocarbons in the exhaust gas.

Recently, emission regulations are one of the most serious issues related to the increase of exports, as they are a problem that hinders the export of automobiles in accordance with the strengthening regulations on environmental pollution in developed countries such as North America.

Accordingly, an object of the present invention is to provide an apparatus for preventing fuel leakage of a fuel tank for facilitating the flow of boil-off gas through an evaporation tube while effectively preventing fuel leakage.

1 is a schematic diagram showing a fuel supply system of an automobile.

2 is a sectional view showing the structure of a conventional fuel leakage preventing apparatus.

3 is a cross-sectional view showing the configuration of the fuel leakage preventing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

20: body 21, 22, 23: through hole

25: rib 26, 27: through-hole

28: stopper 29: sealing surface

31: floating body 32: base

33: spring 34: sealing means

36: disc 37: push bar

40: ball

In order to achieve this object, the present invention has a neck portion formed on the top and having a sealing surface, a rib having an inclined surface installed at the top of the neck portion and a stopper having a through hole in the center and a plurality of side and bottom surfaces. A body having a through hole; Floating body mounted on the bottom of the stopper of the body; A base installed on the stopper of the body formed on the upper end of the body and having a protruding end projecting in the direction of the body through the through hole of the stopper; A sealing means installed on the base via an elastic means and having a disc for sealing the sealing surface of the body and a push protrusion extending upward of the disc; Provided is a fuel leakage preventing device of a fuel tank composed of balls mounted on an inclined surface of a rib of a body.

In addition, the present invention provides an apparatus for preventing fuel leakage of a fuel tank in which oily is installed on the sealing surface of the neck part to improve the sealing property with the disk of the sealing means.

In addition, the present invention provides a fuel leakage preventing device of the fuel tank using the coil spring as the elastic means, and formed with a support protrusion for supporting the spring on the top of the base.

By using the fuel leakage shut-off device configured as described above, it is possible to prevent the loss or loss of the harmful gas removal function of the exhaust gas generated when the fuel in the tank is introduced into the canister through the evaporation pipe when refueling or when the vehicle vibrates and turns. Has

In addition, by reducing the emissions of harmful gases contained in the exhaust gas can contribute to the export of automobiles as well as environmental protection.

Hereinafter, a fuel leakage preventing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a detailed configuration of the fuel leakage preventing apparatus according to the present invention.

As shown, the fuel leakage preventing device according to the present invention is composed of a body 20 is installed on the lower end of the reservoir (5) connected to the evaporation tube (4) and the leakage blocking means installed in the body (20). Body 20 according to the present invention is configured to form a plurality of through-holes 21, 22, 23 through the cylindrical outer wall and the bottom of the body 20 to increase the total surface area of the through-holes for the boil-off gas.

On the other hand, in the body 20, the floating body 31 of the rectangular parallelepiped at the bottom is installed at the bottom, the stopper 28 having a through hole 28a in the center extending inward from the lower portion of the body 20 upwards ) Is formed and an extension 32a extending in the direction of the floating body 31 through the through hole 28a of the stopper 28 is formed at the upper end of the stopper 28, and supports the spring 33 at the upper end thereof. A disk-shaped base 32 on which support protrusions 32b are formed is installed. On the base 32, a sealing means 34 supported by the spring 33 and extending upward is provided.

The sealing means 34 is formed of a disk-shaped disk 36 supported on a spring 33 installed on the base 32 and a push bar 37 extending to the top of the disk 36.

Meanwhile, a neck portion 29 having a reduced diameter of the body 20 is formed on the upper portion of the body 20, and the bottom surface of the neck portion 29 abuts on the disk 36 of the sealing means 34. The sealing surface 29a for pushing 20 is formed, and the rib 25 is formed in the upper part of the neck part 29 again in diameter, and the connection part with the reservoir 5 is formed. In addition, the rib 25 has a flat bottom surface and an inclined top surface, and through holes 26 and 27 through which evaporated gas passes are formed at the bottom surface and the top surface. On the other hand, in order to improve the sealing property between the sealing surface 29a and the disk 36 of the sealing member 34, it is preferable to form or install the oil ring 29b in the sealing surface 29a.

In addition, the inclined surface of the rib 25 is equipped with a metal ball 40, which is a heavy body, is pressed to press the push bar 37 of the sealing means 34 is configured to open the passage for the evaporated gas to pass.

Therefore, in the leakage blocking device according to the present invention, unlike the conventional ball ball 40 is mounted on the top of the leakage blocking device for the opening of the usual sealing means 34 and when the roll over to the top of the reservoir (5) The sealing means 34 is detached and is configured to seal the passage in the center of the sealing surface 29a by the self weight and the base 32 and the floating body 31, not the weight of the ball 40.

The fuel leakage blocking device configured as described above has a spring 33 provided between the base 32 and the sealing means 34 when the ball 4 does not press the push bar 37 of the sealing means 34. The disk 36 of the sealing means 34 is brought into close contact with the lower end of the sealing surface 29a of the neck portion 29 formed on the upper portion of the body 20 so that the fuel can pass through the through holes 21, 22, 23, 24. Is prevented from entering the evaporation tube (4).

However, during normal driving of the vehicle, the disc 36 of the sealing means 34 presses the push bar 37 of the sealing means 34 to compress the spring 33 so that the disk 36 of the sealing means 34 is sealed. It is separated from and to provide a passage of the boil-off gas.

The inclination of the rib 25 is configured to prevent fuel from flowing into the evaporation tube 4 when the vehicle is inclined, such as a sharp turn of the vehicle. When the vehicle is inclined more than a predetermined angle, the ball 40 is rib 25. By moving to one side along the upper inclined surface of the sealing means 34 is separated from the sealing means 34 is raised, as described above, to block the sealing surface 29a of the body 20.

On the other hand, when fuel is temporarily injected, or when the oil level of the fuel temporarily rises due to the turning or shaking of the vehicle, the floating body 31 installed at the lower end of the body 20 rises as the oil level rises, thereby extending the extension end of the base 32 ( 32a) raises the base 32 and raises the sealing means 34 and the ball 40 while the ball 40 is placed on the sealing means 34 so that the disk 36 of the sealing means 34 The sealing surface 29a is blocked to prevent the fuel from flowing into the evaporation tube 4.

In addition, when the vehicle is overturned, the ball 4 moves to the upper end of the reservoir 5 to release the sealing means 34. Therefore, the ball 4 is sealed by the spring 33 which is an elastic means compressed on the base 32. As soon as the means 34 is raised, the disk 37 immediately blocks the sealing surface 29a, and the base 32 and the floating body 31 are moved and pressed, thereby improving the sealing property in the overturned state.

Function of the canister 7 generated by injecting the fuel in the tank 1 into the canister 7 through the evaporation pipe 4 when refueling or vibrating and turning the vehicle by using the fuel leakage blocking device configured as described above. It has the effect of reducing the content of harmful gas contained in the exhaust gas by preventing damage or loss.

Accordingly, by reducing the emissions of harmful gases contained in the exhaust gas can contribute to the environmental protection as well as to increase the export of automobiles.

Although one specific embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various changes and modifications may be made by those skilled in the art based on the technical idea of the present invention.

Claims (3)

A body having a neck portion formed at an upper side thereof, a neck having a sealing surface, a rib having an inclined surface installed at an upper end of the neck portion, and a stopper having a through hole at the center and a plurality of through holes at the side and the bottom thereof; Floating body mounted on the bottom of the stopper of the body; A base installed on the stopper of the body formed on the upper end of the body and having a protruding end projecting in the direction of the body through the through hole of the stopper; A sealing means installed on the base via an elastic means and having a disk for sealing the sealing surface of the body and a pressing protrusion extending upward of the disk; A fuel tank fuel leakage preventing device comprising a ball mounted on an inclined surface of a rib of a body. The fuel leakage preventing device of a fuel tank according to claim 1, wherein an oil ring is installed on a sealing surface of the body. The fuel leakage preventing apparatus of claim 1, wherein the elastic means is a coil spring and a support protrusion is formed at an upper end of the base to support a spring.