JPH0576842U - Sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] When the opening 2 of the oil supply pipe 1 is closed by the cap 12, the internal pressure of the tank is prevented from being excessively increased and the tank is damaged. When the pressure exceeds a specified value, the pressure is released to the outside. Further, in a state where the cap 12 is removed from the opening 2 of the fuel supply pipe 1 and the fuel gun is not yet inserted into the opening 2, the vapor of the fuel in the tank is prevented from leaking from the opening 2 to the outside. [Structure] When the opening 2 of the oil supply pipe 1 is closed by a cap 12, a projection 13 provided on the cap 12 presses and opens the shutter seal 4. When the shutter seal 4 opens, the internal pressure of the oil supply pipe 1 reaches the relief valve 14, and when the internal pressure exceeds a predetermined value, the relief valve 14 opens and the pressure is released to the outside. When the cap 12 is removed from the opening 2, the projection 13 is disengaged from the shutter seal 4, the shutter seal 4 is closed, and the internal flow path of the oil supply pipe 1 is closed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal device mounted on an oil supply pipe for fuel such as gasoline.

[0002]

[Prior Art]

 A cap should be attached to the opening of the oil supply pipe that communicates with the tank to close the opening.When supplying fuel to the tank, remove the cap and insert a fuel gun into the opening to perform fueling work. If so, the following is required. A) It is necessary to release the pressure to the outside when the internal pressure exceeds a specified value so that the internal pressure of the tank does not rise excessively and the tank is damaged when the opening is closed with a cap. There is. B) It is necessary to prevent the fuel vapor in the tank from leaking to the outside when the cap is removed from the opening and the fuel gun is not yet inserted into the opening.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above points, and an object thereof is to provide a sealing device that satisfies both the above-mentioned requirements (a) and (b).

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the sealing device of the present invention is installed inside the oil supply pipe and is a normally closed shutter seal that opens and closes the internal passage of the oil supply pipe, and is attached to and detached from the opening of the oil supply pipe. A cap that is freely mounted and has a protrusion that opens the shutter seal when it is mounted, and a cap that is provided on the cap and opens when the internal pressure of the oil supply pipe exceeds a predetermined value to release the pressure to the outside. And a relief valve for escaping.

[0005]

[Action]

 When the opening of the oil supply pipe is closed by the cap, the projection provided on the cap presses and opens the shutter seal. When the shutter seal opens, the internal pressure of the oil supply pipe reaches the relief valve, and when the internal pressure exceeds a predetermined value, the relief valve opens and the pressure is released to the outside. When the cap is removed from the opening, the projection comes off the shutter seal and the shutter seal closes, closing the internal flow passage of the oil supply pipe.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a shutter seal 4 is attached inside a fuel supply pipe 1 communicating with a tank (not shown) on the left side of the drawing, and a cap 12 is detachably attached to an opening 2 of the fuel supply pipe 1. The cap 12 is provided with a relief valve 14. The shutter seal 4 opens and closes the internal flow path 3 of the oil supply pipe 1 and is always closed. That is, the mounting member 6 is airtightly fitted to the inner periphery of the oil supply pipe 1 via the seal member 5, an opening 8 is formed in the end wall 7 of the mounting member 6, and the opening 8 1 is a hinge-shaped lid member 9. The lid member 9 is elastically biased by a spring 10 in a direction to close the opening 8 by the tank. Around the opening 8, a sealing member 11 is attached, which is brought into contact with and separated from the lid member 9 in accordance with its operation. The cap 12 is integrally formed with a projection 13 for pressing and releasing the lid member 9 of the shutter seal 4 against the elasticity of the spring 10 when the cap 12 is mounted. The relief valve 14 opens to release the pressure to the outside when the internal pressure of the oil supply pipe 1 exceeds a predetermined value. That is, the valve chamber 15, the plurality of valve holes 16 and the external communication hole 17 are formed in the cap 12, and the valve body 18 accommodated in the valve chamber 15 is elastically biased by the spring 19 to open the valve hole 16 in the wall 20. When the internal pressure flowing in from the valve hole 16 is larger than the elasticity of the spring 19, the valve body 18 moves to open the valve against the elasticity of the spring 19, and the pressure is transferred to the valve chamber 15 and the external communication hole. It escapes to the outside via 17. A seal member 21 is attached to the valve body 18 so as to come into contact with and separate from the wall 20 according to its operation.

As shown in FIG. 1, when the opening 2 of the oil supply pipe 1 is closed by the cap 12 in the sealing device having the above-described configuration, the projection 13 provided on the cap 12 presses and opens the shutter seal 4. When the shutter seal 4 opens, the internal pressure of the fuel supply pipe 1 reaches the relief valve 14, and when the internal pressure exceeds a predetermined value, the relief valve 14 opens and the pressure is released to the outside. Further, as shown in FIG. 2, when the cap 12 is removed from the opening 2, the projection 13 is disengaged from the shutter seal 4 and the shutter seal 4 is closed, and until the fuel gun is inserted into the opening 2, The internal flow path 3 is closed. Therefore, according to the sealing device having the above-mentioned configuration, a) when the opening 2 is closed by the cap 12, the internal pressure of the tank does not rise excessively and the tank is not damaged by a predetermined value. The pressure can be released to the outside when the temperature exceeds the above value. (B) At the same time, when the cap 12 is removed from the opening 2 and the fuel gun is not yet inserted in the opening 2, the fuel vapor in the tank It is possible to prevent leakage from the opening to the outside, and thus it is possible to satisfy the above-mentioned requirements of both a and b.

[0009]

[Effect of the device]

 The present invention has the following effects. A) When the opening of the oil supply pipe is blocked with a cap, the internal pressure of the tank will not rise excessively when the internal pressure exceeds a specified value so as not to damage the tank. You can escape. (B) It is possible to prevent the vapor of the fuel in the tank from leaking outside from the opening when the cap is removed from the opening of the oil supply pipe and the fuel gun is not yet inserted in the opening.

[Brief description of drawings]

FIG. 1 is a sectional view of a sealing device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the sealing device with a cap removed.

[Explanation of symbols]

 1 Oil Supply Pipe 2 Opening 3 Internal Flow Path 4 Shutter Seal 5, 11, 21 Sealing Member 6 Mounting Member 7 End Wall 8 Opening 9 Lid Member 10, 19 Spring 12 Cap 13 Protrusion 14 Relief Valve 15 Valve Chamber 16 Valve Hole 17 External Communication hole 18 Valve body 20 Wall

Claims (1)

[Scope of utility model registration request] 1. A normally closed shutter seal 4 which is mounted inside a fuel supply pipe 1 to open and close an internal flow path 3 of the fuel supply pipe 1, and is detachably mounted to an opening 2 of the fuel supply pipe 1.
Protrusion 1 that presses and releases the shutter seal 4 when mounted
A sealing device having a cap 12 provided with 3 and a relief valve 14 which is provided in the cap 12 and opens when the internal pressure of the oil supply pipe 1 exceeds a predetermined value to release the pressure to the outside.