KR200227702Y1 - vent valve structure for anti-leakage of fuel vaporized gas - Google Patents

Abstract

The present invention relates to a structure of a vent valve for preventing leakage of fuel evaporation gas. The vent valve mounted on the fuel tank to send fuel evaporation gas to the canister is opened only at the time of refueling and is normally closed. The fuel evaporation gas transferred to the canister can be transferred to the canister through a two-way valve that opens when the pressure in the fuel tank rises above a certain pressure, thereby increasing the rated capacity of the canister that captures fuel from the fuel evaporation gas. The aim is to reduce costs and to reduce costs.

In order to achieve the above object, the present invention provides a vent valve (2) mounted on the fuel tank (1) to prevent only fuel leakage in a liquid state and to transfer only gaseous fuel evaporation gas to the canister (3). A housing 7 configured to be partitioned into a first passage 5 and a second passage 6 via a partition 4 therein, and fuel for overturning on the first passage 5 in the housing 7. Fuel cut valve (8) to block external leakage of the gas, a two-way valve (9) installed on the partition (4) so as to open only under constant pressure conditions, and when oiling on the second passage (6) in the housing (7) The flapper 10 is installed so as to be opened only, and the second passage 6 is integrally provided with a plotter 11 which rises as the level of fuel in the fuel tank 1 rises.

Description

Vent valve structure for anti-leakage of fuel vaporized gas

The present invention relates to a vent valve installed in a fuel tank of an automobile. In particular, the vent valve is normally closed but opened only when refueling, so that liquid fuel is not transferred to the canister, thereby reducing the capacity of the canister. The present invention relates to a structure of a vent valve for preventing leakage of fuel evaporation gas that can reduce cost.

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 mounted on the fuel tank 101, as shown in Figure 1 to prevent the fuel outflow of the liquid state only gaseous fuel evaporation gas A vent valve 102 configured to pass outside, a fuel cut valve 103 configured to block external leakage of fuel stored in the fuel tank 101 during a full rollover of the vehicle on the side of the vent valve 102; The 2-way valve 104 connected to the fuel cut valve 103 and opened only under a predetermined pressure condition, and connected to the vent valve 102 and the 2-way valve 104 to collect fuel evaporation gas delivered therefrom. The gaseous fuel evaporation gas is sent to the intake cylinder of the engine for combustion and pure air is discharged to the atmosphere through a close valve (not shown) and an air filter (not shown).

Here, the fuel injection portion 107 is provided on the side of the fuel tank 101 having a shut-off valve 106 that is open at the time of fueling.

Accordingly, the shutoff valve 106 is opened when the fuel is refueled into the fuel tank 101, and fuel evaporation gas generated during refueling is collected in the canister 105 through the vent valve 102.

And the fuel evaporation gas collected in the canister 105 is sent back to the intake pipe of the engine, the pure air contained therein is released to the atmosphere.

Meanwhile, in FIG. 1, the separator for separating only the liquid component from the fuel evaporation gas flowing therefrom and in communication with the vent valve 102 is not illustrated.

By the way, in the leak prevention device of the fuel evaporation gas as described above, the vent valve 102 is always open, and the fuel evaporation gas evaporated into the gaseous state tends to flow into the canister 105 through the usual. Since the two-way valve 104 does not operate except when the fuel is fully charged, the amount of fuel evaporation gas transferred to the canister 3 is excessively excessive, so that the rated capacity of the canister 105 needs to be increased. There was this.

Therefore, the present invention was conceived in view of the above, and the vent valve mounted on the fuel tank to send fuel evaporation gas to the canister is configured to be opened only at the time of refueling and to be closed normally. The fuel evaporation gas can be transferred to the canister through a two-way valve that opens when the pressure in the fuel tank rises above a certain pressure, thereby reducing the rated capacity of the canister collecting fuel from the fuel evaporation gas. In addition, the purpose is to reduce the cost accordingly.

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

Figure 2 is a schematic diagram showing a leak prevention device of the fuel evaporation gas according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-Fuel Tank 2-Vent Valve

3-Canister 4-Bulk

5-First Pass 6- Second Pass

7-housing 8-fuel cut valve

9-2 Way Valve 10-Flapper

11-Plotter 12-Fuel Injection

13-off valve 14-link member

The present invention for achieving the above object is, the first passage is installed on the fuel tank to prevent the fuel flow in the liquid state while the only gaseous fuel evaporation gas is transferred to the canister, the first passage through the partition wall. And a housing configured to be partitioned into a second passage, a fuel cut valve for blocking external leakage of fuel during the overturn on the first passage within the housing, a two-way valve installed to open only under a predetermined pressure condition on the partition wall, and the housing. And a flapper installed so as to open only on the second passage in the gas passage, and a floater integrated in the second passage as the water level rises in the fuel tank.

Hereinafter, 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.

The present invention, as shown in the figure, while preventing the outflow of liquid fuel in the interior of the fuel tank (1) vents to transfer only the gaseous fuel evaporation gas to the canister (3) connected to the intake cylinder of the engine It relates to a valve (2), the vent valve (2) is a housing (7) forming a closed volume of a predetermined volume inside the fuel tank (1), and a purge installed inside the housing (7) It comprises an earl valve (8), a two-way valve (9) and a flapper (10).

Here, the housing 7 forms a first passage 5 and a second passage 6 separated from side to side through a main partition wall 4 vertically disposed therein, and the first passage 5 And some sections of the lower end of the second passage 6 communicate with each other, and the first passage 5 is connected to the fuel tank via an opening passage 7a formed on the bottom portion of the housing 7. It communicates with the inside of 1).

In addition, a fuel cut valve 8 is provided on the first passage 5 in the housing 7 to block external leakage of fuel stored in a full rollover of the vehicle. It is disposed on the passage 5 and is provided on the first auxiliary partition 4a that forms a through hole at a substantially central portion.

On the other hand, on the main partition wall 4 in the housing 7 is a two-way valve (9) for opening the pressure inside only a certain condition or more to communicate between the first passage (5) and the second passage (6) Is installed.

In addition, a flapper 10 is provided on the second passage 6 in the housing 7 so as to be rotatable on the housing 7 so as to be opened only when fuel is being supplied. A second auxiliary bulkhead 4b, which is disposed horizontally on the second passage 6 and forms a through hole at an approximately central portion thereof, is provided, and the fuel tank (3) is provided at the through hole of the second auxiliary bulkhead 4b. A floater 11 is provided which rises under buoyancy as the water level of the fuel stored in 1) rises to block traffic between the vent valve 2 and the canister 3.

Here, the plotter 11 is connected to the buoy (11a) and the buoy (11a) freely lifted / lowered by receiving buoyancy from the fuel stored in the fuel tank (1) of the housing (7) A rod 11b inserted into the opening passage 7a formed in the bottom surface portion and a stopper connected to an upper side of the rod 11b to selectively open and close a through hole formed on the second auxiliary partition wall 4b ( 11c).

On the other hand, the flapper 10 rotatably installed in the second passage 6 of the housing 7 is rotated at the time of refueling of fuel at the lower end portion of the fuel injection unit 12 provided at the side of the fuel tank 1. The shut-off valve 13 and the link member 14 which are opened and connected to each other are connected to each other, and the shut-off valve 13 is rotated by the pressure of the fuel flowing into the fuel injection part 12 when the fuel is injected. The link member 14 is moved, and as the link member 14 moves, the flapper 10 connected thereto is rotated to open the second passage 6 in the housing 7. The operation of the flapper 10, the shutoff valve 13 and the link member 14 is shown by a dashed line)

Hereinafter, the detailed operation of the present invention will be described.

First, the vent valve 2 installed in the fuel tank 1 is normally rotated by the flapper 10 receiving the intake underpressure acting on the canister 3 from the engine, thereby forming a second passage formed in the housing 7. As 6) remains closed (solid line), fuel evaporation gas evaporated inside the fuel tank 1 is not introduced into the canister 3.

At this time, when the internal pressure of the fuel tank 1 rises while the amount of fuel evaporated gas evaporated inside the fuel tank 1 increases, the fuel evaporation gas is formed on the bottom surface of the housing 7. It acts on the two-way valve 9 through the formed opening passage 7a and the lower communication portion of the main bulkhead 4, and the two-way valve 9 is operated when the pressure of fuel evaporation gas rises above a certain value. Is opened to transfer the fuel evaporation gas to the canister 3, which is a state in which the fuel cut valve 8 opens the through hole of the first auxiliary bulkhead 4a provided on the first passage 5. If the vehicle is overturned, the fuel cut valve 8 closes the through hole of the first auxiliary bulkhead 4a provided on the first passage 5. 3) it is possible to prevent unnecessary inflow of fuel evaporation gas.

On the other hand, when the fuel is supplied through the fuel injection unit 12, the shutoff valve 13, which is rotatably installed at the lower end of the fuel injection unit 12, is rotated under pressure from the fuel injected and opened. (Shown by a dashed-dotted line), the link member 14 is moved by the rotation of the shutoff valve 13, and the movement of the link member 14 is performed by It is transmitted to the flapper 10 provided on the two passages 6 to rotate it in an open state (illustrated by a dashed line).

As a result, excessive fuel evaporation gas generated when the fuel is injected into the fuel tank 1 can be smoothly transferred to the canister 3 through the second passage 6 of the open housing 7 and collected.

Then, when the amount of fuel injected into the fuel tank 1 reaches the nominal capacity, the buoy 11a of the plotter 11 is raised by receiving buoyancy from the injected fuel, and the buoy 11a The stopper 11c connected via the rod 11b as the ascend closes the through hole formed in the second auxiliary partition 4b provided on the second passage 6, and as a result, the fuel tank 1 The fuel evaporation gas which evaporates in the c) cannot be transferred to the canister 3.

At this time, the internal pressure is increased by the fuel evaporation gas that is not transferred to the canister 3 in the fuel tank 1, and the increased internal pressure is a shutoff valve 13 installed at the lower end of the fuel injection unit 12. The back pressure (back pressure) is a pressure acting in a direction opposite to the pressure in the normal direction such as the exhaust of the engine, that is, the gas pressure, and closes the shutoff valve 13 gradually.

As such, when the shut-off valve 13 provided in the fuel injection unit 12 is closed, the fuel injected through the fuel injection unit 12 is filled in the fuel injection unit 12 to fill the fuel injection unit ( 12) When the level of the fuel in the tank is raised and the liquid level of the fuel reaches the fuel sensing sensor mounted at the tip of the fuel injection gun (not shown), the fuel injection gun is automatically stopped. To stop fuel injection.

In addition, after the injection of fuel is finished, the flapper 10 which is interlocked through the closed shut-off valve 13 and the link member 14 is normally connected to the second passage 6 of the housing 7. By closing, since the traffic between the vent valve 2 and the canister 3 is blocked, fuel evaporation gas is not transferred directly to the canister 3 through the second passage 6, and the first passage (5), when the pressure of the fuel evaporation gas acting on the two-way valve (9) is increased to a predetermined value or more, the two-way valve (9) is opened to release the fuel evaporation gas to the canister (3) Can be transferred to).

Therefore, in the above-described leak prevention apparatus for fuel evaporation gas, the flapper 10 of the vent valve 2 provided in the fuel tank 1 is opened in cooperation with the shut-off valve 13 which is opened at the time of fueling to open the fuel. The fuel evaporation gas generated during injection of the fuel can be smoothly transferred to the canister (3), and the amount of fuel stored in the fuel tank (1) exceeds the nominal capacity so that the floater (11) vent valve (2) When the traffic between the canister 3 and the canister 3 is interrupted, fuel injection is stopped by the back pressure acting on the shutoff valve 13, and unnecessary fuel evaporation to the canister 3 through the vent valve 2 is performed. The inflow of gas can be prevented so that unnecessary capacity increase of the canister 3 is not caused.

In addition, the blocking of the traffic between the vent valve 2 and the canister 3 by the floater 11 is normally carried out by the flapper 10 through the closed state of the shutoff valve 13 in the fuel tank 1. By maintaining the second passage 6 of the valve 2 in the closed state, it is possible to prevent the transition of unnecessary fuel evaporation gas due to the closing between the vent valve 2 and the canister (3).

In this case, when the pressure of the fuel evaporation gas generated in the fuel tank 1 rises above a certain value, the fuel evaporation gas may be transferred to the canister 3 through the two-way valve 9. In addition, the pressure in the fuel tank 1 can always be maintained below the appropriate level.

As described above, according to the structure of the vent valve for preventing leakage of fuel evaporation gas according to the present invention, the vent valve mounted on the fuel tank and sending fuel evaporation gas to the canister is opened only at the time of refueling, thereby closing the fuel at normal time. Liquid fuel evaporation gas of the fuel stored in the tank is not normally transferred to the canister, so that the capacity of the canister does not have to be increased, thereby reducing the cost.

Claims (1)

A housing 7 partitioning the internal space into the first passage 5 and the second passage 6 via the main partition 4 in the fuel tank 1 and in the first passage 5. Fuel cut valve 8 installed on the first auxiliary bulkhead 4a to close the through hole formed only when the vehicle is overturned to prevent fuel leakage, and pressure in the fuel tank 1 on the main bulkhead 4. A two-way valve 9 installed to open in a predetermined time or more, a flapper 10 rotatably installed to open only when fuel is supplied into the second passage 6, and a second provided in the second passage 6; The plotter 11 and the inside of the fuel tank 1 which are provided to close the through-hole formed on the auxiliary auxiliary wall 4b when the fuel stored in the fuel tank 1 is increased above the nominal capacity, It is rotatably installed on the lower side of the fuel injection portion 12 installed toward the side and connected via the flapper 10 and the link member 14 as a medium. As the injection opening when the data structure of the flapper shut-off valve 13, vent valve for the leak-proof apparatus of a fuel evaporation gas characterized in that the configuration including the conversion of 10 into an open state.