KR20190070564A - Air drain device of fuel system - Google Patents

Abstract

The present invention relates to an air drain apparatus for a fuel system, and more particularly, to an air drain apparatus having a drain function for discharging moisture introduced into an air drain case.

Description

Technical Field [0001] The present invention relates to an air drain device for a fuel system,

The present invention relates to an air drain apparatus for a fuel system, and more particularly, to an air drain apparatus having a drain function for discharging moisture introduced into an air drain apparatus.

Generally, the vehicle is provided with a fuel injection structure for injecting fuel into the fuel tank through a fuel injection port. This fuel injection structure forms an injection path of fuel to one side of the fuel tank 2 as shown in FIG. 1 And a filler neck which is integrally connected to the filler pipe 4 and connected to the inside of the fuel tank 2 in parallel with the filler pipe 4 .

The canister 8 is connected to one side of the fuel tank 2 to collect the fuel to be evaporated and to send the fuel to the combustion chamber. The fuel tank 2 is connected to one side of the canister 8 and an end of the vent line 6 The filter 10 is further included.

The vent line 6 discharges the air in the fuel tank 2 to the outside to smoothly inject fuel into the fuel tank 2 during the injection of the fuel into the fuel tank 2 through the filler pipe 4, Or when the fuel is injected to the nominal capacity inside the fuel tank 2, the conduit is blocked by the oil level of the nominal capacity and functions to block the fueling of the fuel through the filler pipe 4.

2, an air drain case 12 protruded to be connected to the atmosphere is formed at the end of the vent line 6, and air is supplied to the end of the air drain case 12 And a filler neck packing (not shown) is formed in order to seal a portion where the air inlet case 16 into which the fuel is injected and the air drain case 12 are joined with the outer filler door housing 18 are formed.

When the engine-side PCSV (purge control solenoid valve) is opened, the air-drain case 12 flows into the vent line 6 through the vent hole 14 formed in the air-drain case 12, (10), and the evaporated gas collected in the canister (8) is moved to the intake manifold of the engine and burned.

The conventional filler neck packing structure may seal the inside of the filler door housing from the outside to prevent dust and moisture from entering the inside of the filler door housing. However, when there is a large amount of moisture penetration, A large amount of water is introduced through the upper surface of the door housing and water is drawn up to the vent hole of the air drain case 12. [

Accordingly, when purging, moisture accumulated on the outside flows into the vent line 6 through the vent hole 14 of the air-drain case 12, so that water is generated in the air filter 10 and the fuel system is damaged There is a possibility that the ventilation resistance is increased, and various problems such as the engine warning lamp are turned on due to the closure of the CCV Canister Close Valve due to the disconnection of the circuit occur.

Korean Patent Registration No. 10-1640547

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to solve the problems of damaging a fuel system and turning on an engine warning light due to inflow of moisture into an air filter by discharging moisture introduced into an air- To solve the problem.

In order to accomplish the above object, according to the present invention, there is provided an air-

A valve for opening and closing the inside of the air drain case is formed at a lower end of the air drain case. When the water flows into the air drain case at a predetermined amount or more, the valve is opened and moisture is discharged to the outside of the air drain case.

The air-

A vent line coupling portion having one side communicating with the vent line and the other side having a vent hole serving as an external material inlet;

And a filler pipe coupling portion disposed at a lower end of the vent line coupling portion to communicate with the vent line coupling portion and having a valve at the lower surface thereof.

The valve,

A valve hole formed on a bottom surface of a lower end of the filler pipe coupling portion;

A hinge engaging part formed at one side of the valve hole;

A sealing portion mounted on an edge portion of the valve hole;

An opening / closing part formed in a shape for closing the valve hole, a hinge part formed at one side thereof and hinged to the hinge coupling part;

And a spring that is inserted into the hinge portion and has one end connected to the hinge coupling portion and the other end connected to the opening and closing portion to apply an elastic force to the opening and closing portion when the opening and closing portion is opened and closed.

The valve,

When the load of water stored at the lower end of the filler pipe coupling part is larger than the elastic force of the spring, moisture pushes the opening and closing part downward to open the opening and closing part.

When the valve is closed,

And the inner surface of the opening and closing part is in a state of being in tight contact with the sealing part.

The valve,

A valve hole formed on a bottom surface of a lower end of the filler pipe coupling portion;

And a rubber thin plate formed in a shape closing the valve hole and having one side fixedly coupled to one side of the valve hole.

The valve

And when the load of water stored at the lower end of the filler pipe coupling part is larger than the elastic force of the rubber thin plate, moisture pushes the rubber thin plate downward to open the rubber thin plate.

When the valve is closed,

And the inner surface of the rubber thin plate is in close contact with the edge of the valve hole.

And the outer diameter portion of the filler pipe having an axial direction parallel to the axial direction of the vent line passes through the center portion of the filler pipe coupling portion.

And the filler pipe coupling portion is divided into an upper end portion and a lower end portion with respect to a center line that crosses the upper and lower sides.

The upper end portion and the lower end portion of the filler-

And protruding portions formed at both ends of the upper end portion are interference fit to the coupling holes formed at the upper end of the lower end portion and are coupled to each other.

According to the present invention, moisture introduced into the air drain case is prevented from flowing into the air filter, thereby preventing an early shut-off due to inflow of moisture into the air filter, a fuel system damage such as fuel overflow, There is an effect of solving the problem of.

1 is a schematic view of a fuel injection structure of a conventional vehicle;
2 is an enlarged perspective view of a conventional airdrain device.
3 is a schematic view of an air drain device according to the present invention.
FIG. 4 is an exploded perspective view of FIG. 3; FIG.
5 is a schematic view of a valve closed state of an air drain device according to the present invention.
6 is a schematic view of a valve open state of an air drain device according to the present invention.
7 is a schematic view of a valve closed state of a second embodiment according to the present invention.
8 is a schematic view of a valve open state of a second embodiment according to the present invention.
Fig. 9 is an internal schematic view of a conventional air drain device during water inflow. Fig.
10 is an internal schematic view of an air inflow of an air drain device according to the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that the same components are denoted by the same reference numerals in the drawings. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

The present invention relates to an air drain apparatus for a fuel system, and more particularly, to an air drain apparatus having a drain function for discharging moisture introduced into an air drain case.

The vent line 6 includes a fuel tank 2, a canister 8, an air filter 10, a filler pipe 4, a vent line 6 and an injection port 16, And an air drain case 20 connected to the end of the vent line 6. The air drain case 20 has an air drain case 20 at the lower end thereof, A valve for opening and closing the valve body is formed to discharge the water introduced into the air drain case 20.

Fig. 3 shows a schematic view of an air-drain device according to the present invention, and Fig. 4 shows an exploded perspective view of Fig.

An air drain case 20 according to the present invention includes a vent line coupling portion 22 coupled to the vent line 6 and a vent line coupling portion 22 disposed at a lower end of the vent line coupling portion 22, And a filler pipe coupling portion (24).

One side of the vent line coupling part 22 is communicated with the vent line 6 and the ventilation hole 14 which is an inlet of an external material is formed on the other side.

The filler pipe coupling portion 24 is communicated with the vent line coupling portion 22 and the filler pipe coupling portion 24 is provided with a filler pipe coupling portion 24 having an axial direction parallel to the axial direction of the vent line 6, The outer diameter portion of the pipe 4 is penetrated.

The filler pipe (4) and the filler pipe fitting portion (24) are not communicated with each other, and the filler pipe fitting portion (24) is configured to surround the filler pipe (4).

The filler pipe coupling portion 24 is divided into an upper end portion 26 and a lower end portion 30 with reference to a center line that separates the upper and lower portions.

The upper end portion 26 and the lower end portion 30 of the filler pipe coupling portion 24 are connected to the coupling hole 32 formed at the upper end of the lower end portion 30 by projections 28 formed at both ends of the upper end portion 26, So that they can be assembled more conveniently at the time of assembly.

The valve is formed on a lower surface of the lower end portion 30 of the filler pipe coupling portion 24.

The valve according to the first embodiment of the present invention shown in FIG. 4 includes a valve hole, a hinge connecting portion, a sealing portion, an opening / closing portion, a hinge portion, and a spring.

The valve hole 34 is formed on a lower surface of the lower end 30 of the filler pipe fitting portion 24. The bottom surface of the lower end portion 30 of the filler pipe fitting portion 24 has a cross- As shown in FIG.

The hinge coupling portion 36 is formed at one side of the valve hole 34. [

The opening and closing part 40 is formed to have the same sectional shape as that of the valve hole 34 so as to close the valve hole 34. The hinge part 42 is formed at one side of the opening part 40, ).

The hinge unit 42 is coupled to the inside of the hinge coupling unit 36 so that the hinge coupling unit 36 rotates about the edge of the valve hole 34 with the hinge unit 42 as a rotation axis do.

A sealing portion 38 for closely contacting the valve hole 34 and the opening / closing portion 40 when the valve is closed is mounted on an edge of the valve hole 34.

The hinge part 42 is inserted into the inside of the spring 44 and the other end of the spring 44 is connected to the hinge engaging part 36 and the other end is connected to the opening and closing part 40. When the opening and closing part 40 is opened and closed, So that an elastic force is applied to the opening and closing part 40.

FIG. 5 is a schematic view of the valve closing state of the air drain device according to the present invention, and FIG. 6 is a schematic view of the valve opening state of the air drain device according to the present invention.

When the valve is closed, the inner side surface of the opening / closing part 40 closes the inside of the air drain case 20 in a state of being in close contact with the sealing part 38.

When moisture of a predetermined amount or more flows into the air drain case 20 and the load of the water stored at the lower end of the filler pipe coupling part 24 is larger than the elastic force of the spring 44, The opening / closing part 40 is opened.

When the opening / closing part 40 is opened, moisture inside the air-case case 20 is discharged to the outside through the valve hole 34. When the moisture is completely discharged, the opening / closing part 40 is opened by the elastic force of the spring 44, The valve body 30 is brought into close contact with the valve hole 34 to close the air-flow case 20 again.

FIG. 7 is a schematic view of the valve closing state of the second embodiment according to the present invention, and FIG. 8 is a schematic view of the valve opening state of the second embodiment according to the present invention.

The valve according to the second embodiment of the present invention shown in FIG. 7 includes the valve hole 34 and the rubber thin plate 46.

The valve hole 34 is formed in the same manner as in the first embodiment.

The rubber sheet 46 is formed to have the same cross-sectional shape as that of the valve hole 34 so as to close the valve hole 34. One side of the rubber sheet 46 is fixed to one side edge of the valve hole 34, do.

When the valve is closed, the inner surface of the rubber thin plate 46 is closed to close the inside of the air drain case 20 in a state of being closely attached to the edge of the valve hole 34.

When moisture of a predetermined amount or more flows into the air drain case 20 and the load of the water stored at the lower end of the filler pipe coupling part 24 is larger than the elastic force of the rubber thin plate 46, So that the rubber sheet 46 is opened.

When the rubber thin plate 46 is opened, the moisture in the air drainer case 20 is discharged to the outside through the valve hole 46. When the moisture is completely discharged, the elastic force of the rubber thin plate 46 causes the rubber The thin plate 46 is brought into close contact with the valve hole 34 while closing the air drain case 20 while rotating in the direction opposite to the opening.

FIG. 9 is a schematic internal view of a conventional air drain device, and FIG. 10 is an internal schematic view of a moisture inflow of the air drain device according to the present invention.

In the conventional air drain apparatus, when water flows into the air drain case 12, the moisture can not be discharged to the outside, and the air flows into the air hole 14 of the air drain case 12. Accordingly, at the time of purging, the water has flowed into the vent line 6 and moisture inside the air filter 10 has been damaged, thereby damaging the fuel system or turning on the engine warning lamp.

However, according to the present invention, when the valve is formed at the lower end of the air-drain case 20, the moisture introduced into the air-drain case 20 through the valve is discharged to the outside, 6, it is possible to solve problems such as premature shut-off due to inflow of water into the air filter 10, damage of the fuel system such as fuel overflow, and lighting of the engine warning lamp.

The embodiments of the air-drain device of the fuel system of the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. . It is therefore to be understood that the invention is not limited to the form set forth in the foregoing description. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

2: Fuel tank
4: Filler pipe
6: vent line
8: Canister
10: Air filter
12: Conventional air-drain case
14: vent hole
16:
18: Filler neck packing
20: Air drain case
22: vent line coupling part
24: Filler pipe coupling part
26:
28:
30: Lower end
32: Coupling hole
34: Valve hole
36: Hinge coupling part
38: sealing part
40:
42: Hinge section
44: spring
46: rubber sheet

Claims (11)

An air drain case including a fuel tank, a canister, an air filter, a filler pipe, a vent line, and an inlet port, the air drain case being connected to an end of the vent line so that the vent line can be connected to the atmosphere, ,
A valve for opening and closing the inside of the air-drain case is formed at a lower end of the air-drain case, and the valve is opened to allow the moisture to be discharged to the outside of the air-drain case
Wherein the air-fuel ratio of the air-fuel mixture is higher than that of the air-fuel mixture. The method according to claim 1,
The air-
A vent line coupling portion having one side communicating with the vent line and the other side having a vent hole serving as an external material inlet;
And a filler pipe coupling part disposed at a lower end of the vent line coupling part to communicate with the vent line coupling part and having a valve on the lower surface thereof
Wherein the air-fuel ratio of the air-fuel mixture is higher than that of the air-fuel mixture. 3. The method of claim 2,
Wherein the valve comprises:
A valve hole formed on a lower surface of the lower end of the filler pipe coupling portion;
A hinge coupling formed at one side of the valve hole;
A sealing part mounted on an edge of the valve hole;
An opening / closing part formed in a shape for closing the valve hole, a hinge part formed at one side thereof and hinged to the hinge coupling part;
And a spring that is inserted into the hinge portion at one end thereof and connected to the hinge coupling portion at one end thereof and connected to the opening and closing portion at the other end thereof to apply an elastic force to the opening and closing portion when the opening and closing portion is opened or closed
Wherein the air-fuel ratio of the air-fuel mixture is higher than that of the air-fuel mixture. The method of claim 3,
Wherein the valve comprises:
And when the load of the water stored in the lower end of the filler pipe coupling part is larger than the elastic force of the spring, the water pushes the opening / closing part downward to open the opening / closing part. The method of claim 3,
When the valve is closed,
And the inner side surface of the opening / closing portion is in a state of being in close contact with the sealing portion. 3. The method of claim 2,
Wherein the valve comprises:
A valve hole formed on a lower surface of the lower end of the filler pipe coupling portion;
And a rubber thin plate formed in a shape closing the valve hole and having one side fixedly coupled to one side of the valve hole
Wherein the air-fuel ratio of the air-fuel mixture is higher than that of the air-fuel mixture. The method according to claim 6,
The valve
And when the load of the water stored in the lower end of the filler pipe coupling part is larger than the elastic force of the rubber thin plate, the water pushes the rubber thin plate downward to open the rubber thin plate. The method according to claim 6,
When the valve is closed,
Wherein an inner surface of the rubber thin plate is in close contact with an edge of the valve hole. 3. The method of claim 2,
And an outer diameter portion of the filler pipe having an axial direction parallel to the axial direction of the vent line passes through the center portion of the filler pipe coupling portion. 10. The method of claim 9,
Wherein the filler pipe coupling portion is divided into an upper end portion and a lower end portion with respect to a center line that crosses the upper and lower portions. 11. The method of claim 10,
The upper end portion and the lower end portion of the filler-
Wherein projections formed at both ends of the upper end portion are engaged with each other and engaged with engagement holes formed at the upper end of the lower end portion.

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