KR100273152B1 - Leakage prevention system for fuel vapor gas - Google Patents

Abstract

PURPOSE: A leakage preventing device for evaporated fuel gas is provided to reduce the number of components and to simplify a lay-out by integrating a pipe for communicating between a vent valve and a separate, with two three-way connectors and an one-way valve. CONSTITUTION: An evaporated fuel gas leakage prevention device consists of a vent valve(2) passing only evaporated fuel gas from fuel; a separate(4) separating liquid fuel from the evaporated fuel gas, in a fuel injection port(3); a fuel cut-valve(5) intercepting fuel leakage in case of an overturn accident; a canister(6) collecting pure hydrocarbon gas while connected to the separate and the fuel cut valve; a close valve(7) and an air filter(8) discharging pure air from the evaporated fuel gas of the canister; and a purge pipe(10) connected between the canister and the suction system of an engine(9). Herein, a pipe(11) for communicating between the vent valve and the separate and a pipe(12) for communicating between the side of the fuel injection port and a fuel tank(1), have a restrictive four-way valve(13) to prevent the liquid fuel from flowing to the separate and the canister.

Description

Leak Prevention Device of Fuel Evaporative Gas

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for suppressing the leakage of fuel evaporation gas of an automobile, and in particular, a fuel that is capable of simplifying components by simplifying components by replacing a plurality of valves with one valve. It relates to a leak prevention device of boil-off gas.

In general, in fuel systems such as fuel tanks and fuel inlets of gasoline cars, some of the gasoline fuel vaporizes and evaporates into the atmosphere. This fuel evaporation gas is usually a hydrocarbon (HC). In addition to polluting, fuel evaporation gas leaking into the atmosphere, such as when refueling, is being regulated gradually as it causes serious harm to the human body.

In other words, the ORVR (On Board Vapor Recovery) system has already been applied in North America as part of measures to prevent environmental pollution, which is the fuel system of automobiles in order to prevent the harmful effects of fuel evaporation gas released into the atmosphere by evaporating from the fuel. It is a leak prevention device of fuel evaporation gas which captures fuel evaporation gas which is harmful gas evaporated from and then induces it into intake tube and burns it again to re-burn harmful gas to convert it into less harmful exhaust gas. .

On the other hand, the leak prevention apparatus of the fuel evaporation gas conventionally designed for the purpose as described above is shown in Figure 1, the configuration thereof is mounted on the fuel tank 101, while preventing the fuel outflow of the liquid state of the gaseous fuel The vent valve 102 is configured to pass only the boil-off gas to the outside, and is mounted on the fuel injection part 103 so as to separate only the liquid component from the fuel evaporation gas flowing therefrom. The separator 104 and the fuel tank 101, the fuel cut valve 105, etc. to block the leakage of fuel in the event of a full rollover of the vehicle.

In addition, the separator 104 and the fuel cut valve 105 are connected to a canister 106 configured to collect only pure hydrocarbon gas in fuel evaporation gas, and the canister 106 is connected to only pure air in the collected fuel evaporation gas to the outside. The close valve 107 and the air filter 108 to be discharged are connected, and the canister 106 is provided with a purge pipe 110 connected to the intake pipe of the engine 109 side.

In addition, between the pipe line 111 for communicating between the vent valve 102 and the separate 104, and the pipe line 112 provided to communicate with the fuel tank 101 on the side of the fuel injection section 103, respectively; Three-way connector 113 and one-way valve 114 is provided.

Accordingly, the three-way connector 113 is to communicate between the conduit 111 and the conduit 112, the one-way valve 114 is a liquid fuel is moved from the conduit 111 to the conduit 112. It is possible to move to the inside of the fuel tank 101 through the conduit 112 from the upper side of the fuel injection unit 103, while enabling the movement of the liquid fuel in the reverse direction. (Indicated by arrows and O, X in Figure 1)

A pressure sensor 117 and a two-way valve 118 are mounted on the conduit 115 communicating between the fuel cut valve 105 and the canister 106 via a three-way connector 116.

Therefore, in the leak prevention apparatus of the fuel evaporation gas configured as described above, the vaporized fuel evaporation gas in the fuel tank 101 flows into the separator 104 through the vent valve 102 so that only pure fuel evaporation gas of the fuel evaporation gas is introduced. The primary evaporation is carried out, and the fuel evaporation gas passing through the separator 104 is collected in the charcoal canister 107, and only pure air of the fuel evaporation gas passes through the closing valve 107 and the air filter 108. Hydrocarbon gas harmful to the human body is discharged into the throttle body by the intake negative pressure of the intake pipe of the engine 109 through the purge pipe 110 and is burned.

However, in the leak prevention apparatus of the fuel evaporation gas as described above, the pipeline 111 communicating between the vent valve 102 and the separator 104 and the fuel tank 101 communicate with the side of the fuel injection unit 103. Since two 3-way connectors 113 and one-way valve 114 must be installed between the pipe lines 112 so as to be provided, the lay-out becomes complicated when the vehicle is mounted on the vehicle and the space to accommodate them is insufficient. Not only was it impossible to mount, but there were many types of components, which needed to be simplified.

Accordingly, the present invention has been made in view of the above-mentioned point, and is provided between a pipeline for communicating between a vent valve and a separator mounted on a fuel tank, and two pipelines provided to communicate with a fuel tank on a side of a fuel injection unit. By integrating the 3-way connector and the 1-way valve, the aim is to provide a fuel evaporation leak prevention device that can simplify the layout of the vehicle while simplifying the components.

1 is a schematic view showing a leak prevention apparatus of a conventional fuel evaporation gas,

Figure 2 is a schematic view showing a leak prevention apparatus for fuel evaporation gas according to the present invention,

3 is an enlarged cross-sectional view of the main portion shown in FIG.

4 is a front view of FIG. 3.

<Description of Symbols for Main Parts of Drawings>

1-Fuel Tank 2-Vent Valve

3-fuel injection 4-separation

5- Fuel Cut Valve 6-Canister

7-Close Valve 8-Air Filter

9-engine 10-fuge pipeline

11,12-route 13-reactive 4-way valve

14-housing 15-valve

15a-plate 15b-through

15c-boss section 15d-blocker

15e-bend

The present invention for achieving the above object is a vent valve which is mounted on a fuel tank to pass only the gaseous fuel evaporation gas from the fuel inside, and the fuel evaporation gas flowing from the vent valve Separate mounted on the fuel injection portion to separate only the liquid components, fuel cut valve mounted on the fuel tank to block the leakage of fuel in the event of a full rollover of the vehicle, while being connected to the separator and the fuel cut valve A canister configured to capture only pure hydrocarbon gas, a close valve and air filter configured to discharge pure air from the fuel evaporation gas collected from the canister to the atmosphere, and a purge pipe connected between the canister and the engine intake system In the leak prevention device of the boil-off gas, communication between the vent valve and the separator Key is characterized in that the conduit so that, a conduit for communication between the fuel inlet side portion and the fuel tank is equipped with a list rigs creative four-way valve is not of the liquid fuel flows into the separator and canister.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic view showing a leak prevention apparatus for fuel evaporation gas according to the present invention, Figure 3 is an enlarged cross-sectional view of the main portion shown in Figure 2, Figure 4 is a front view of FIG.

As shown in the figure, a vent valve 2 is installed on the fuel tank 1 to allow only gaseous fuel evaporation gas to pass outside from the fuel stored therein, and flows in from the vent valve 2. A separator (4) separating only the liquid component of the fuel evaporation gas is mounted on the fuel injection unit (3), and the fuel tank (1) has a fuel cut to prevent the fuel from leaking to the outside during a vehicle overturn accident. While the valve 5 is installed, the separator 4 and the fuel cut valve 5 are independently connected to the canister 6 for collecting only pure hydrocarbon gas from the fuel evaporation gas introduced therefrom.

In addition, the canister (6) is connected to a close valve (7) and an air filter (8) that can solve the environmental pollution problem by discharging only pure air of the fuel evaporation gas collected therefrom into the atmosphere, the canister ( The purge pipe 10 is connected between the 6) and the intake cylinder of the engine 9 side.

In addition, the pipeline 11 for communicating between the vent valve 2 and the separator 4 and the pipeline 12 for communicating between the side of the fuel injection unit 3 and the fuel tank 1 are additive. The four-way valve 13 is mounted, and the four-way valve 13 communicates with the vent valve 2, the separator 4, the fuel tank 1, and the fuel injection unit 3, respectively. It is possible to flow the liquid fuel only toward the conduit 11 between the conduit 11 and the conduit 11 and the conduit 12 in the housing 14, and the fuel injection section 3 A valve 15 is provided between the upper end and the fuel tank 1 to enable the flow of liquid fuel only toward the fuel tank 1.

3 and 4, the valve 15 has a disk-shaped plate 15a having a through hole 15b which is concentrically perforated while the outer circumferential surface is hermetically bonded to the housing 14, respectively. The boss portion 15c inserted into and mounted at the center of the plate 15a and the outer end surface of the outer circumference of the boss portion 15c are integrally joined to the outer surface of the boss portion 15c and bent slightly toward the plate 15a. It is made of a rubber-like blocking film 15d having a bent portion 15e.

Accordingly, the restrictive four-way valve 13 enables the fuel of the liquid phase from the conduit 11 to the conduit 12 to move through the conduit 12 from the upper side of the fuel injection section 3. It is possible to move inside the tank 1, while blocking the movement of the liquid fuel in the reverse direction. (Indicated by arrows and O, X in Figure 2)

This is because the reactive four-way valve 13 has a valve 15 in the housing 14, which is a boss 15c on a plate 15a with a through hole 15b. ) Is coupled to the outer periphery has a shielding film (15d) that is elastically in contact with the plate (15a), when the liquid fuel flows into the through hole (15b) of the plate (15a), the introduced fuel While the bent portion 15e of the blocking film 15d is spaced apart from the plate 15a and then allowed to pass, the liquid fuel pushes the blocking film 15d in the opposite direction and passes through the plate 15a. It cannot be passed through 15b).

Therefore, the reactive four-way valve 13 has a structure that can replace the conventional three-way connector 113 and one-way valve 114, the actual fuel evaporation gas leakage prevention device and the actual vehicle In the case of installation, the number of parts required is reduced, so the occupancy of the space occupied in the vehicle is small, so that the structure can be simplified and the cost can be reduced.

On the other hand, as described above, the leakage preventing device for fuel evaporation gas provided with the selective four-way valve 13 flows the vaporized fuel evaporation gas in the fuel tank (1) to the separator (4) through the vent valve (2). The primary function is to filter only pure fuel evaporation gas first, and then collect it in the canister (7) and release only pure air into the atmosphere while sending harmful hydrocarbon gas from the fuel evaporation gas back to the engine (9) for combustion. Of course, it can be performed sufficiently.

As described above, according to the leak prevention apparatus for fuel evaporation gas according to the present invention, it is provided between the pipeline for communicating between the vent valve and the separator mounted on the fuel tank, and the pipeline for communicating between the fuel injection portion and the fuel tank. By replacing the conventional three-way connector and the one-way valve, the restrictive four-way valve has the effect of simplifying the components and the layout of the in-vehicle.

Claims (2)

A vent valve 2 mounted on the fuel tank 1 to allow only the gaseous fuel evaporation gas to pass from the internal fuel to the outside, and only a liquid component of the fuel evaporation gas introduced from the event valve 2. Separate (4) mounted on the fuel injection section (3) to be separated, Fuel cut valve (5) mounted on the fuel tank (1) to block the leakage of fuel in the event of a full rollover of the vehicle, the separator (4) ) And a canister (6) connected to the fuel cut valve (5) to capture only pure hydrocarbon gas from the fuel evaporation gas, and a close valve to discharge pure air from the fuel evaporation gas collected from the canister (6) to the atmosphere. (7) and the air filter (8), the fuel evaporation gas leakage prevention device is provided with a purge pipe (10) connected between the canister (6) and the engine 9 side intake pipes, A four-way piping is provided in the conduit 11 for communicating between the vent valve 2 and the separator 4 and the conduit 12 for communicating between the side of the fuel injection part 3 and the fuel tank 1. The valve (13) is mounted, the fuel evaporation gas leakage prevention device, characterized in that the liquid fuel does not flow into the separator (4) and the canister (6). 2. The plate-shaped plate 15a having the through-hole 15b, the boss portion 15c attached to the plate 15a, and the boss. A device for preventing leakage of fuel evaporation gas, characterized in that the end surface of the outer circumference is integrally bonded to the portion (15c) and is formed of a rubber-like blocking film (15d) having a bent portion (15e) in close contact with the plate (15a).

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