JP2001173815A - Valve device and mounting structure for the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device and a mounting structure for the valve capable of improving durability and mounting property of the valve. SOLUTION: A seal packing 9 is held between a flange part 3 of a valve 1a to be used for a gasoline tank 5 for storing liquid and a cover 4 for covering at least a part of the flange part 3 and covers at least a part uncovered with the cover 4 in the flange part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device and a mounting structure of the valve device, and more particularly to a valve device and a mounting structure of the valve device which are preferably applied to a valve used for a fuel tank such as a gasoline tank.

[0002]

2. Description of the Related Art Conventionally, as a valve device used for a fuel tank, a float valve used for exhausting fuel vapor or the like in a gasoline tank is known. For example, packing is used as a sealing device that exhibits a sealing property for mounting and fixing the float valve.

[0003] As a conventional valve device of this type, there is one provided in a fuel tank 101 of a vehicle, for example, as shown in FIG. FIG. 11 shows a schematic view of use of a conventional valve device.

[0004] That is, the valve device 102 is provided above the fuel tank 101, and is normally in a valve-open state, and discharges the fuel vapor 100 G generated inside the fuel tank 101 to the discharge path 103.

[0005] The discharged fuel vapor 1
A canister 104 or the like that absorbs 00G is provided as needed to prevent the fuel vapor 100G from being directly released into the atmosphere.

Further, the valve device 102 can be used when the liquid level of the fuel 100L rises due to refueling, or when the water level of the fuel 100L rises temporarily due to shaking or acceleration / deceleration of the running vehicle. A liquid shutoff function is also provided to prevent the fuel 100L in the fuel tank 101 from leaking to the discharge path 103 when the fuel tank 101 is tilted or falls.

Next, the valve device shown in FIG. 11 will be described with reference to FIG. FIG. 12 shows the valve device 1
FIG. 2 is a cross-sectional configuration explanatory diagram illustrating a basic configuration of No. 02.
In the drawing, reference numeral 110 denotes a case of the valve device 102, in which a float chamber 110 in which a float 111 is accommodated.
a.

The float 111 generates buoyancy by the fuel 100L flowing into the inside of the float chamber 110a from the communication hole 112a of the cap 112 attached to the lower side of the case 110, and moves upward in the state of FIG. Also one
Reference numeral 13 denotes a spring that functions as a biasing unit for adjusting the buoyancy of the float 111.

A valve body 111a is provided above the float 111.
The valve seat portion 110b connected to the discharge path 103 is provided at a position corresponding to the valve body above the float chamber 110a. And the valve body 111
a and the valve seat portion 110b, the float valve 1
05 is constituted.

Therefore, as shown in FIG.
02 is a normal erect state, and when the liquid level of the fuel 100L is low, the float 111 is located below the float chamber 110a by its own weight, the float valve 105 is opened, and the fuel vapor in the fuel tank 101 is opened. 100G can be exhausted to the discharge path 103.

In the valve device 102 having such a structure, the pressure in the fuel tank 101 (mainly the fuel vapor 100
In order to quickly decelerate the pressure due to the air present in G, it is necessary to increase the diameter of the valve seat portion 110b and the valve body 111a to increase the exhaust flow rate of the float valve 105.

When the pressure in the fuel tank 101 rises after the float valve 105 is once closed, the pressure difference between the pressure in the canister 104 and the pressure in the fuel tank 101, which is almost the same as the atmospheric pressure, is obtained. The float 111 generates a sticking force in proportion to the size of the diameter of the valve seat portion 110b.
1 and the urging force of the spring 113, and the float valve 105 is kept closed.

In order to prevent such "sticking phenomenon" without reducing the diameter of the valve seat portion 110b, it is necessary to increase the weight of the float 111 itself or reduce the urging force of the spring 113. However, in that case, it is necessary to increase the buoyancy to quickly close the float 111 as the liquid level of the fuel rises.

Therefore, in the float 111 shown in FIG. 12, the inside of the cylindrical body 111c that seals the upper end surface and opens the lower side is an air reservoir 111b, and the air (fuel) existing in the air reservoir 111b is formed. Steam 10
0G etc.) to generate buoyancy.

The material of the float 111 is a polyacetal resin (specific gravity of about 1.4 when not filled, specific gravity of about 1.6 with filler (glass fiber)) is excellent in fuel durability and water absorption. Although preferably used in general, nylon can also be used.

Next, a structure for mounting the above-mentioned conventional valve device to a gasoline tank will be described with reference to FIG. FIG. 8 shows a partial structural view of a conventional valve device 102 (float valve).

As shown in FIG. 8, a conventional valve device 102 includes a valve 120 comprising a body 121 and a flange portion 122 provided around the body 121.
And a cover 1 covering at least a part of the flange portion 122
23, a fixing part 125 for fixing the gasoline tank 124 and the valve 120, a welding bolt 126, a nut 127, and a packing 128 sandwiched between the flange part 122 and the fixing part 106.

The body 121 has the above-mentioned float 1 inside.
11 and has a substantially cylindrical structure.

The flange portion 122 is connected to the gasoline tank 12.
4 and is fixed by welding bolts 126. Generally, such a flange portion 122 of the valve 120 is formed integrally with the body 121 and made of resin.

The gasoline tank 124 has a welding bolt 1
Fixing part 1 for fixing 26 to gasoline tank 124
25 is fixed by welding.

The welding bolts 126 are sequentially connected to the fixing portion 12.
5, packing 128, flange 122, cover 123
And the nut 127 is closed, and the nut 127 is closed to fix them to the gasoline tank 124.

Next, the valve device 102 shown in FIG. 8 will be described in more detail with reference to FIG. In FIG.
FIG. 9 shows a partially enlarged view of the valve device 102 shown in FIG. 8.

As shown in FIG. 9, a packing 1 is provided between a flange portion 122 of a body 121, which is generally formed of polyacetal resin, and a gasoline tank 124.
28 are sandwiched.

The packing 128 seals a gap X between the end of the gasoline tank 124 and the body 121 and the flange portion 122, so that leakage from the mounting opening of the valve 120 can be prevented.

The packing 128 is made of, for example, NB
It may be formed of R (butadiene acrylonitrile rubber). Also, the cover 123 is generally SP
Formed by CC.

[0026]

However, the prior art as described above has a problem that it is difficult to improve the durability of the valve and a problem that its mounting property is low. I have.

(Problems Concerning Durability) For example, a valve used for a sealed container as a fuel system tank such as a gasoline tank often uses a resin body, but the resin body is generally made of a material. In most cases, polyacetal is used.

Polyacetal has various advantages in engineering plastics, as listed below.

1. A good balance of various properties with a focus on mechanical properties. 2. Excellent fatigue resistance. 3. Excellent friction characteristics. 4. Excellent elastic recovery. 5. Excellent oil and solvent resistance. 6. With high dimensional stability. 7. It has good electrical properties. 8. It has good moldability. 9. Wide operating temperature range.

However, it is known that such a resin body is deteriorated due to its material properties when metal ions such as Zn and Cu are interposed.

The reason for the deterioration is, as shown in the following chemical formula, that Zn or Cu ions are bonded to O, and as a result, the arm connected to CH ₂ is released.

[0032]

Embedded image

The durability of such a resin body is not a problem in normal use, but when it is exposed to harsh conditions such as salt water such as seawater, it will not be able to be used with other parts. Similarly, bolts and nuts to which the present valve is attached may rust, and the rust (rust water) adheres to the valve body, and metal ions in the rust may deteriorate the surface of the valve body.

Usually, the degree of deterioration is only the thin layer on the surface, and has little effect on the function of the present valve. Nevertheless, it is important to take some measures. Therefore, as one of the measures, there is a method in which a metal capturing material is added in advance to the resin material forming the valve body.

However, in this method, the type of the trapping material and
Depending on the amount added, the metal ions are trapped up to a certain amount, but the effect is reduced when the amount is more than that.

That is, although the initial effect can be expected, it cannot cope with long-term exposure to severe conditions.

The above problem will be described in more detail with reference to FIG. FIG. 10 shows a structural view of the conventional valve shown in FIG. 8, FIG. 10A shows a top view thereof, and FIG. 10B shows a partial structural view thereof. In FIG. 10, the welding bolt 126, the nut 127, the gasoline tank 124, and the packing 128 are arranged from the valve shown in FIG.
Is omitted.

As shown in FIG.
1 has a flange 122 attached to a gasoline tank 124 via a cover 123 by a welding bolt 126.

Therefore, the shaded portion 130 shown in FIG.
And the circle R includes metal ions such as Zn and Cu,
Iron oxide, zinc oxide, and the like coming out of the welding bolt 126, the nut 127, the cover 123, and the like, and an aqueous solution of calcium chloride sprayed from the outside (hereinafter, also referred to as a corrosive substance or the like) may accumulate.

That is, as shown in FIG. 10A, the above-described welding bolt 126
Is formed with a fitting hole 129 for fitting.
Then, a nut 127 is fitted into a portion of the welding bolt 126 protruding from the fitting hole 129.

With such a structure, the welding bolt 12
6 and the nut 127 (especially the nut 127) are rusted by direct exposure to the wind and rain, and the rust water containing metal ions such as Zn and Cu flows in the direction D in the figure as shown in FIG. May move.

As a result, rust water accumulates in the hatched portion 130 shown in FIG. The corrosive substances and the like accumulate in the hatched portions and the rounded portions R shown in FIG. 10, thereby preventing the valve, particularly, the valve body made of resin from being improved in durability.

Further, a welding bolt 1 for mounting a valve is provided.
Since the nut 26 and the nut 127 are exposed, there is a case where the durability of the mounting portion is reduced due to rust under severe conditions.

(Problem of Attachment) For example, FIG.
In the prior art shown in FIG.
Together with the RVR, it is attached via a welding bolt 126 provided on the gasoline tank 124. For this reason,
At the time of assembling, there are usually about 3 to 4 screwing operations, and the time required for assembling has increased.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a valve device and a valve mounting structure capable of improving the durability and mounting properties of a valve. Is to provide.

[0046]

In order to achieve the above object, a valve device according to the present invention comprises a valve body having a flange fixed to a container and having at least a part of the flange. A cover member that covers, a clamped portion sandwiched between the flange portion by the cover member, and a cover portion extending from the clamped portion toward the valve body, and a part of the cover portion is And a sealing means serving as a sealing portion in close contact with the valve body.

Further, a valve body having a flange portion fixed to the container at the periphery thereof, a cover member covering at least a part of the flange portion, a close contact portion in close contact with the cover member, and a valve from the close contact portion A sealing means having a cover part extending toward the main body, and a part of the cover part serving as a sealing part in close contact with the valve main body.

Further, the mounting structure of the valve device according to the present invention is characterized in that the mounting structure of the valve device for fixing a flange portion provided on the valve body around the opening of the container. Provided fixing means, a base fixed to the container by the fixing means,
A resin engagement member having an engagement protrusion protruding from the base portion, wherein an engagement hole provided in the flange portion is fitted to the engagement protrusion of the engagement member, and the valve body is connected to the container. And fixed around the opening.

Further, a seal member is provided between the periphery of the opening of the container and a flange provided on the valve body, and the fixing means has an outer seal seat for supporting the seal member. An inner seal seat that supports an inner peripheral end of the seal member at an edge of the opening of the container,
The seal member is sandwiched between the flange portion and the inner seal seat portion and the outer seal seat portion.

Further, the fixing member and the base of the engaging member are annular members each having a fitting portion that fits with each other, and the opposing surfaces of both the fitting portions of the fixing member and the base and the base of the container. An annular gap surrounded by the periphery of the opening is formed, and a second seal member is disposed in the annular gap.

[0051]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

In the following drawings, the same reference numerals are given to members described in the drawings used in the above description of the prior art and members similar to the members described in the drawings described above.

(First Embodiment of Valve Device) First, a first embodiment of a valve device according to the present invention will be described with reference to the drawings. FIG. 1 shows a structural diagram of a first embodiment of a valve device according to the present invention.

As shown in FIG. 1, a valve device 1 according to the present invention has a valve 1a as a valve body of the present invention constituted by a body 2 and a flange portion 3, and the present invention to which the valve 1a is fixed. Gasoline tank 5 as a container, cover 4 as a cover member of the present invention covering flange portion 3, and seal packing 9 as a sealing means of the present invention interposed between flange portion 3 and cover 4.
And a fixing portion 7 for fixing the gasoline tank 5 and the valve 1a, a welding bolt 6, a nut 10, and a packing 8 interposed between the flange portion 3 and the fixing portion 7.

In the present embodiment, the welding bolt 6 is fixed to the gasoline tank 5 by a fixing portion 7 as in the above-described conventional technique.

The welding bolt 6 is fitted with the packing 8, the flange 3, the seal packing 9 as the sealing means of the present invention, the cover 4, and the nut 10.

As described above, in one embodiment of the valve device according to the present invention, the seal packing 9 is sandwiched between the flange 3 and the cover 4.

The reason for this is that Zn ions or carbon ions flowing out of the welding bolts 6 and the nuts 10 exposed to the outside of the cover 4
This is to prevent corrosive substances such as rust water containing u ions from eroding the body 2 and the flange 3 of the valve 1a.

That is, even if the corrosive substance such as the rust water is generated, the portions of the welding bolt 6 and the nut 10 exposed to the outside of the cover 4 and the portion of the body 2 and the flange portion 3 of the valve 1 a Are separated by the seal packing 9, so that erosion due to the rust water, corrosive substances, and the like can be prevented.

Next, the seal packing 9 shown in FIG. 1 will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2 is a structural view of a first embodiment of the valve device shown in FIG. 1, and FIG.
2 (b) and FIG. 2 (c) show a partial structural view thereof.

However, in FIGS. 2A and 2B,
For simplicity, the welding bolt 6,
The nut 10, the gasoline tank 5, the packing 8, and the fixing part 7 are omitted.

As shown in FIG. 2A, the cover 4
Has a fitting hole 21 from which a welding bolt (not shown) protrudes. Then, the nut 10 is fitted into the welding bolt 6 protruding from the fitting hole 21.

Further, around the body 2 of the valve 1a,
A seal packing 9 is provided so as to surround the body 2.

Further, on the side surface of the seal packing 9, there is formed a slot 3 for fitting a projection 4 a provided on the body 2.
a is formed.

As shown in FIG. 2B, a part of the seal packing 9 extends from the space B between the body 2 and the cover 4 to the outside of the sandwiching start end A which is the inner peripheral end of the cover 4. Has survived.

Although not shown in FIG. 2, the seal packing 9 according to the present invention is, for example, the one shown in FIGS.
As described in the description, the bolt and the nut (not shown) are fitted between the flange portion 3 and the cover 4 so as to be sandwiched. Therefore, in the present embodiment, the flange portion 3, the cover 4, and the gasoline tank 5 are firmly fitted.

Therefore, as shown in FIG. 2A, even if the welding bolts protruding from the fitting holes 21 and the nuts fitted into the welding bolts rust, even if the rust water flows in the direction D, the sealing bolt is not sealed. Valve 1 with packing 9
Since rust water does not reach the body 2 and the flange 3 of a,
The body 2 and the flange 3 of the valve 1a are not eroded.

Here, the structure of the seal packing 9 shown in FIG. 1 will be further described with reference to FIG. FIG.
2 shows a structural diagram of the seal packing 9 shown in FIG.
3A shows a top view, FIG. 3B shows a front view, FIG. 3C shows a back view, and FIG. 3D shows a side view.

As shown in FIG. 3, the seal packing 9 of the present embodiment is provided with the edge 2 as a portion to be held according to the present invention, which is sandwiched between the flange 3 and the cover 4 of the valve 1a.
2, a cover portion 26 surrounding the body 2,
This is a part of the cover part 26, and is integrally formed with the wall part 23 as the sealing part of the present invention, which is in close contact with the body 2.

As shown in FIGS. 3A and 3C, a hole 24 for inserting a welding bolt is provided in the edge 22 of the seal packing 9.

The wall 23 of the seal packing 9 has
A protrusion 4a provided on the body 2 of the valve 1a (FIG. 2)
(See (a)), and a recess 25 for fitting the outer tube portion of the discharge path of the valve 1a is provided.

Further, the width of the edge 22 of the seal packing 9,
That is, the length L1 from the innermost periphery to the outermost periphery of the edge portion 22 of the seal packing 9 is preferably equal to or longer than the length of the flange portion 3 as shown in FIG. This is for preventing a substance from the outside or a corrosive substance such as rust water flowing out of the welding bolt or nut from adhering to the flange portion 3.

Here, the film thickness t of the seal packing 9
Is made as thin as possible in consideration of creep after tightening.

With such a structure, in the first embodiment of the valve device according to the present invention, corrosive substances such as iron oxide, zinc oxide, and calcium chloride aqueous solution are deposited on the body 2 and the flange portion 3 of the valve 1a. Adherence can be prevented.

Therefore, the first embodiment of the valve device according to the present invention prevents deterioration of a valve, particularly a resin valve, even when the valve device is fixed using welding bolts and nuts. Its durability can be improved.

(Second Embodiment of Valve Device) Next, a second embodiment of the valve device according to the present invention will be described with reference to FIG. FIG. 4 shows a structural diagram of a second embodiment of the valve device according to the present invention.

The second embodiment of the valve device according to the present invention differs from the first embodiment in that the edge 22 of the seal packing 9 as the sealing means according to the present invention is different from the cover member according to the present invention. A cover 26 is formed on the seal packing 9 so as to seal at least a portion of the flange 3 not covered by the cover 4, which is not sandwiched between the cover 4 and the flange 3. Of course, the seal packing 9 may extend over the cover 4.

It is preferable that the edge 22 of the seal packing 9 is bonded to the bonding portion 22a on the cover 4 with an adhesive or the like.

Even with such a configuration, the same effect as in the above-described second embodiment can be obtained.

(Embodiment of mounting structure of valve device)
Next, an embodiment of a mounting structure of a valve device according to the present invention will be described with reference to the drawings. FIG. 5 shows a structural diagram of a mounting plate A51 as a fixing means of the present invention used in one embodiment of the valve device mounting structure according to the present invention, and FIG. FIG. 5B shows a structural diagram thereof.

As shown in FIG. 5, a mounting plate A51 as a fixing member according to the present invention is provided with an outer edge 52 of an opening O of a gasoline tank 52 as a container according to the present invention.
a.

At the outer edge 52a of the gasoline tank 52,
A rising portion 52b extending upward, and the rising portion 52b
And a laterally extending portion 52c as an inner seal seat portion of the present invention which is bent toward the center of the opening O. The rising portion 52b and the laterally extending portion 52c constitute one step shape.

Further, the mounting plate A51 rises stepwise from the lower annular portion 51a fixed to the outer edge 52a of the opening O by spot welding or the like toward the outer edge, and the present invention as a seal seat portion is provided. Has an upper ring portion 51b as an outer seal seat portion, and has an O-ring 71 as a second seal member and a mounting member as an engagement member of the present invention below the upper ring portion 51b as described later. The plate B61 is attached.

Next, a mounting plate B61 used in one embodiment of the mounting structure of the valve device will be described with reference to FIG. FIG. 6 shows a structural view of a mounting plate B61 used in an embodiment of the mounting structure of the valve device, FIG. 6 (a) shows a partial top view thereof, and FIG. 6 (b) shows its structural view. Is shown.

However, the top view shown in FIG.
It is the figure which showed only the left half of the attachment plate B61. The right half is the same as the left half shown in FIG.

As shown in FIG. 6, the mounting plate B61 has a shape corresponding to the opening O of the gasoline tank 52, and is circular in this embodiment.

The mounting plate B61 having the base 62 fitted to the upper ring 51b of the mounting plate A51 is provided with a projection 63 as an engagement projection of the present invention.

A fitting portion 64 is formed on the innermost periphery of the base portion 62 so as to fit into the lower portion of the upper ring portion 51b of the mounting plate A61. That is, the fitting portion of the present invention is formed by the upper ring portion 51b and the fitting portion 64.

The radius R2 from the center O 'of the mounting plate B61 to the fitting portion 64, which is the innermost periphery of the base 62, is from the center of the opening O of the gasoline tank 52 as shown in FIG. It is larger than the radius R1 of the plate A51 up to the rising portion 52b.

At the tip of the projection 63 provided on the base 62, an arrow-shaped detachment prevention portion 65 is formed.
The detachment preventing portion 65 is open in a normal state, but can be closed by applying pressure. Therefore, when inserting the protrusion 63 into a hole or the like, the detachment prevention portion 65 is closed and inserted. The mounting plate B61 can be integrally formed of a resin material.

Next, with reference to FIG. 7, a description will be given of a structure when a valve is mounted on a gasoline tank using one embodiment of a valve device mounting structure according to the present invention. FIG. 7 shows a structural diagram of a structure in which a valve is mounted on a gasoline tank using one embodiment of a valve device mounting structure according to the present invention.

As shown in FIG. 7, in an embodiment of the mounting structure of the valve device according to the present invention, a valve 70a as a valve body of the present invention constituted by a body 2 and a flange portion 3, and the valve 70a A gasoline tank 52 as a container of the present invention to which 70a is fixed, and a mounting plate A51, a mounting plate B61 for fixing the gasoline tank 52 and the valve 70a;
And a packing 73 as a seal member of the present invention.

The valve 70a having the flange 3
Are fixed to the gasoline tank 52. The fixing of the valve 70a to the gasoline tank 52 is performed by fitting the protrusion 63 provided on the mounting plate B61 into the flange 3 of the valve 70a.

That is, first, the mounting plate A5
1 mounting plate A51 below the upper ring 51b, the lower plate 51a and the upper ring 51b.
An O-ring 71 as a second seal member is provided in an annular gap surrounded by a stepped-up portion, a fitting portion 64 which is an inner peripheral end of the base portion 62 and an outer periphery of an opening of the gasoline tank 52. Attach.

As described above, the mounting plate B61
5, the radius R2 from the center of the opening O of the gasoline tank 52 to the fitting portion 64, which is the innermost circumference of the base portion 62, as shown in FIG.
Is larger than the radius R1 up to the rising portion 52b.

Then, in the range of the difference between R2 and R1,
Attach the O-ring 71. Therefore, the O-ring 71
The width of R2-R1 is determined in consideration of the elasticity of the O-ring 71.
Somewhat larger than good. Thus, the O-ring 7
1 is sandwiched between the mounting plate A51 and the mounting plate B61.

Then, the mounting plate B61 is
Mounting plate A51 to which ring 71 is mounted
(When the mounting plate B61 is made of a resin material, the mounting plate B61 is sandwiched and fixed while being bent.)

The mounting plate B61 is firmly fixed by the elasticity of the O-ring 71, but the gasoline tank 52 and the base 62 of the mounting plate B61 are bonded together when the O plate 71 is more firmly fixed. You may.

Next, after the mounting plate B61 having the projection 63 is fixed to the gasoline tank 52, the mounting plate B61 is inserted through the engagement hole 73a of the packing 73.
The protrusion 63 of 61 is inserted into the engagement hole 72 of the flange 3.

As described above, the separation preventing portion 65 of the projection 63
Is closed when the engaging hole 72 of the flange portion 3 is inserted, and is opened after the insertion, and the flange portion 3 is naturally separated from the projection portion 63 because the detachment preventing portion 65 is formed with a turn. There is no.

A packing 73 as a sealing member is interposed between the mounting plate A51, the gasoline tank 52 and the mounting plate B61, and the flange 3 of the valve 70a.

The projection 63 provided on the mounting plate B61 also fixes the packing 73. The height of the projection 63 is set to a height at which the packing 73 is sufficiently crushed.

For this reason, the packing 73 seals the two points of the laterally extending portion 52c, which is the inner peripheral end of the opening circle O of the gasoline tank 52, and the upper ring portion 51b of the mounting plate A51. The sealing performance with the outside can be improved.

As described above, in one embodiment of the mounting structure of the valve device according to the present invention, the gasoline tank is sealed at the portion E as the inner peripheral seal seat shown in FIG. At two points in the C section by the O-ring 71,
The structure prevents foreign matters such as water from entering the vicinity of the mounting plate A51.

Therefore, according to the embodiment of the mounting structure of the valve device according to the present invention, the flange portion 3 provided on the valve 70a is fixed by the projection 63 provided on the mounting plate B61. In addition, it is not necessary to use bolts and nuts as in the related art, and it is possible to prevent erosion of the valve and the flange due to corrosive substances such as rust water, and to improve the durability.

Further, since the flange portion 3 and the packing 73 of the valve 70a are mounted by the projections 63 provided on the mounting plate B61, the conventional mounting using bolts and nuts and a cover plate are not required. The number of installation steps can be reduced, and the attachment can be improved.

[0107]

As described above, according to the present invention, the sealing means extends between the flange portion and the cover member covering at least a part of the flange portion, and extends toward the valve body. Rust water containing metal ions such as Zn and Cu flowing out of bolts and nuts that fix the flange portion to the container, for example, because it has a covering portion that comes out and a sealing portion that partially adheres to the valve body. Corrosive substances, such as iron oxide, zinc oxide, and calcium chloride solution, such as substances from the outside, can be prevented from adhering to the valve body and flange, preventing deterioration of the valve body and flange. And its durability can be improved.

Further, the sealing means has a close contact portion in close contact with the cover member and a cover portion extending toward the valve body, and a part of this cover portion serves as a sealing portion in close contact with the valve body. Corrosion including iron oxide, zinc oxide, calcium chloride aqueous solution and the like, such as rust water containing metal ions such as Zn and Cu flowing out of bolts and nuts fixing the flange portion to the container, and substances from the outside. Since the substance can be prevented from adhering to the valve body and the flange, the deterioration of the valve body and the flange can be prevented, and the durability thereof can be improved.

Also, since the container is fixed to the valve body by fitting an engaging projection projecting from the base of the engaging member to a flange provided on the valve body, bolts and nuts are conventionally used. It is no longer necessary to use such a material, and corrosion substances such as rust water containing metal ions such as Zn and Cu flowing out of bolts and nuts can be prevented from adhering to the valve body and the flange portion. And the durability can be improved, and the valve body can be easily attached to the container.

Further, a seal member inserted between the periphery of the opening of the container and the flange provided on the valve body is inserted between the flange, the inner seal seat and the outer seal seat. Therefore, since the inside and the outside of the container are sealed at least at two points, the sealing performance can be further improved.

[0111] Further, an annular gap surrounded by the opposing surfaces of the fitting portion of the fixing member and the base and the periphery of the opening of the container is formed, and the second seal member is arranged in this annular gap. Thus, the sealing performance around the opening of the container, between the fixing member and the engaging member can be further improved.

[Brief description of the drawings]

FIG. 1 is a structural view of a first embodiment of a valve device according to the present invention.

FIG. 2 is a structural view of the valve device shown in FIG.

FIG. 3 is a structural diagram of the seal packing shown in FIG. 2;

FIG. 4 is a structural view of a second embodiment of the valve device according to the present invention.

FIG. 5 is a structural view of a mounting plate A used in an embodiment of the mounting structure of the valve device according to the present invention.

FIG. 6 is a structural diagram of a mounting plate B used in an embodiment of the mounting structure of the valve device according to the present invention.

FIG. 7 is a structural diagram of a structure in which a valve is mounted on a gasoline tank using one embodiment of a valve device mounting structure according to the present invention.

FIG. 8 is a partial structural view of a conventional valve device.

FIG. 9 is a partially enlarged view of the valve shown in FIG. 8;

FIG. 10 is a structural view of the conventional valve shown in FIG.

FIG. 11 is a schematic view of use of a conventional valve device.

FIG. 12 is a sectional configuration explanatory view illustrating a basic configuration of a valve device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve apparatus 1a Valve 2 Body 3 Flange part 3a Slot part 4 Cover 4a Projection part 5 Gasoline tank 6 Weld bolt 7 Fixing part 8 Packing 9 Seal packing 10 Nut 21 Fitting hole 22 Edge 22a Adhesive part 23 Wall part 24 Hole part Reference Signs List 25 concave portion 26 covering portion 51 mounting plate A 51a lower ring portion 51b upper ring portion 52 gasoline tank 52a outer edge portion 52b rising portion 52c laterally extending portion 61 mounting plate B 62 base 63 projecting portion 64 fitting portion 65 disengagement preventing portion 70 valve device 70a Valve 71 O-ring 72 Engagement hole 73 Packing 73a Engagement hole 100 Body 100G Fuel vapor 100L Fuel 101 Fuel tank 102 Valve device 103 Discharge path 104 Canister 105 Float valve 106 Fixing part 110 Case 1 0a Float chamber 110b Valve seat 111 Float 111a Valve 111b Air reservoir 111c Body 112 Cap 112a Communication hole 113 Spring 120 Valve 121 Body 122 Flange 123 Cover 124 Gasoline tank 125 Fixed part 126 Weld bolt 127 Nut 128 Packing hole 129 130 Shaded area A Pinching start end B Between O Opening R Round part X Gap

Claims (5)

[Claims] 1. A valve body having a flange fixed to a container provided therearound, a cover member covering at least a part of the flange, and a clamped member sandwiched between the flange by the cover member. A valve device comprising: a sealing portion that has a portion and a covering portion extending from the held portion toward the valve body, and a part of the covering portion serves as a sealing portion that is in close contact with the valve body. 2. A valve body around which a flange fixed to a container is provided, a cover member covering at least a part of the flange, a close contact closely contacting the cover, and a valve from the close contact. A valve device, comprising: a cover part extending toward the main body; and a sealing unit that forms a sealing part in which a part of the cover part is in close contact with the valve main body. 3. A mounting structure of a valve device for fixing a flange portion provided on a valve body around an opening of a container, wherein: a fixing device provided around the opening of the container; A resin fixing member having a base fixed to the container and an engaging protrusion protruding from the base, an engaging hole provided in the flange at the engaging protrusion of the engaging member. A mounting structure for a valve device, characterized in that parts are fitted together and a valve body is fixed around an opening of a container. 4. A sealing member interposed between a periphery of an opening of the container and a flange provided on the valve body, wherein the fixing means includes an outer seal seat for supporting the sealing member. An inner seal seat for supporting an inner peripheral end of the seal member is provided at an edge of the opening of the container, and the seal member is sandwiched between the flange, the inner seal seat, and the outer seal seat. The mounting structure for a valve device according to claim 3, wherein: 5. The fixing member and the base of the engaging member are annular members each having a fitting portion that fits into each other, and the surfaces of the fixing member and the base that face each other and the fitting portion are opposite to each other. The mounting structure for a valve device according to claim 3, wherein an annular gap surrounded by an opening is formed, and a second seal member is disposed in the annular gap.