JP2003074798A - High pressure gas cylinder valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reduction of airtightness in attachment/detachment to/from a gas pipe, in a gas cylinder valve installed to a high pressure gas cylinder. SOLUTION: In this cylinder valve provided in the high pressure gas cylinder, a portion abutting on a connection port tip for supplying and replenishing a gas is formed with a ring-like step part cut from the inner circumferential edge to the outer circumferential edge side, and the step part is installed with a ring-like gasket. The gasket is provided such that a tip face connected to the gas pipe projects from the tip of the connection port and that the gasket is not detached when attaching/detaching the gas pipe. Thereby, the connection port tip face is protected by the gasket, and the airtightness is not impaired even if a tip corner part of a cap nut provided in the gas pipe contacts with the connection port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure gas container valve mounted on a high pressure gas container.

[0002]

2. Description of the Related Art Generally, a high pressure gas container is connected to a gas pipe via a container valve. FIG. 6 is a view showing a state in which the conventional container valve 2 is attached to the high pressure gas container 1, and 20 is a main body,
Reference numeral 21 is a handle, and 22 is a connection port. This connection port 22
The connection structure between the gas pipe 3 and the gas pipe 3 will be described with reference to FIG. 6 and FIG.
Is formed, and the tip surface 24 has a ring-shaped groove 25.
Are formed.

On the other hand, an enlarged diameter portion 31 called a sleeve or a nipple is formed at the tip end portion of the gas pipe 3, and a ring-shaped groove 33 corresponding to the groove 25 is formed on the tip end surface 32 of the enlarged diameter portion 31. Are formed. Further, the gas pipe 3 has a cap nut 35 having a threaded portion 34 formed on the inner peripheral surface thereof.
Is externally fitted, and the tip end surface 24 of the connection port 22 of the container valve 2 is
The cap nut 35 is connected to the connection port 22 with the gasket 30 interposed between the gas pipe 3 and the tip end surface 32 of the expanded diameter portion 31 of the gas pipe 3.
When tightened by screwing it into the
It enters into 33 and the connection port 22 and the gas pipe 3 are connected with high airtightness.

[0004]

By the way, when the high-pressure gas container 1 described above runs out of gas or is filled with gas, once the gas pipe 3 is disconnected from the container valve 2,
For example, the container valve 2 is transferred to a gas filling factory and the like, filled with gas, and then connected to the gas pipe 3 again for use.

However, when the gas pipe 3 is removed from the high-pressure gas container 1, the gasket 30 sandwiched between the front end surface 32 of the gas pipe 3 and the front end surface 24 of the connection port 22 falls, and the gas pipe is connected to the high-pressure gas container 1. When connecting 3, the operator holds the gasket 30 by hand and interposes it between the two, so there is a timing at which the tip end surface 24 on the connection port 22 side is exposed during the work. For this reason, for example, the cap nut 35 may slide toward the tip side and come into contact with the seal area 24a (see FIG. 7) sealed by the gasket 30 at the tip end surface 24 of the connection port 22 and the portion may be damaged. At the time of the above connection, there is a concern that the airtightness of the relevant part may be reduced.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a gas container valve mounted on a high-pressure gas container from being damaged in a seal area when the valve is attached to or detached from a gas pipe. To provide the technology.

[0007]

In the high pressure gas container valve according to the present invention, the outer peripheral surface of the high pressure gas container valve is screwed into a cap nut externally fitted to the gas pipe, and the high pressure gas container valve is connected to the enlarged diameter portion at the tip of the gas pipe. A container valve provided with a gasket between which a gas tightness is ensured is provided, and the gasket is attached to the connection port side in a container valve mounted in a high-pressure gas container.

With such a structure, the high pressure gas container valve can be attached to and detached from the gas pipe while always protecting the sealing region of the valve with the gasket. Therefore, for example, even if the tip of the cap nut and the tip of the connection port of the high-pressure gas container valve come into contact with each other when the gas pipe is attached or detached, the seal area is not affected, and there is no risk of gas leakage.

Specifically, for example, a ring-shaped step portion cut out from the inner peripheral edge toward the outer peripheral edge side is formed at a portion contacting the ring-shaped tip end surface of the connection port, and the ring-shaped gasket is formed on this step portion. Alternatively, a ring-shaped groove may be formed in the end face of the connection port along the circumferential direction, and a ring-shaped gasket may be mounted in the groove.

Furthermore, without processing the connection port as in the above example, the shape of the gasket is, for example, a tubular part attached to the connection port, and the end portion of the tubular part contacts the end face of the connection port. The same effect can be obtained even with a configuration including a collar portion provided so as to be in contact with each other.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a high pressure gas container valve according to the present invention will be described below with reference to FIGS. FIG. 1 is a vertical cross-sectional view showing the overall structure of a container valve (high-pressure gas container valve) 5 mounted on a high-pressure gas container 4 and the structure near the tip of a gas pipe 6 connected to the container valve. It will be described from the 5 side. In the figure, reference numeral 51 denotes a connecting portion that projects into the high-pressure gas container 4, and above the main body 53, which has a connecting port 52 that opens to the lateral side and serves as a detachable portion for the gas pipe 6, and from the high-pressure gas container 4. Connection port 5
A handle 55 for opening and closing the gas flow path 54 communicating with 2 is provided.

The connection port 52 is formed as a tubular member which projects laterally from the main body 53, and a screw portion 56 is formed on the outer peripheral surface thereof. The inner peripheral surface forms, for example, a cavity having a diameter larger than that of the gas flow path 54, and a ring-shaped step portion 57 is cut away from the inner peripheral edge toward the outer peripheral edge at a portion in contact with the ring-shaped tip surface. Is formed, and the ring-shaped gasket 7 is attached to the step portion 57. The gasket 7 has a rear end (on the side of the main body 53) fitted in the step portion 57, and a front end side of the gasket 7 has a connection port so as to ensure airtightness of the joint portion at least when the container valve 5 and the gas pipe 6 are joined. The shape projects from the tip of the gas pipe 52 to the front side and corresponds to the tip of the gas pipe 6.

Further, in determining the size and shape of each of the gasket 7 and the step portion 57, the container valve 5 and the gas pipe 6
In order to prevent the gasket 7 from coming off the step portion 57 when attaching or detaching the gas pipe 6 in the gasket 7 when joining the gasket 7, the ring width, the connection port 52 and the gas pipe 6, for example. Alternatively, the area of the contact portion with the opening 52, the adhesive force at the contact portion, and the frequency of attachment / detachment of the container valve 5 and the gas pipe 6 are considered.

Next, the gas pipe 6 will be described. The characteristic of the present invention resides in the container valve 5, and the gas pipe 6 is substantially the same as the gas pipe 3 described in the section of the prior art. The structure of the gas pipe 6 will be briefly described with reference to FIG. 1, and thereafter, referring to FIG. 2 and FIG. 3 in addition to FIG.
And how the container valve 5 is attached and detached will be described.
In FIG. 1, reference numeral 61 denotes a diameter-increased portion formed at the tip of the gas pipe 6, and a ring-shaped groove 63 is formed on the tip surface 62 at a position corresponding to the tip surface 71 of the gasket 7. A cap nut 64 is externally fitted to the gas pipe 6, and its shape is a pressing portion 64a that surrounds the periphery of the gas pipe 6 with a slight gap, and a cylinder that extends forward from the outer edge of the pressing portion 64a. The tubular portion 64b is formed with a threaded portion 65 on the inner peripheral surface thereof.

Next, how the gas pipe 6 and the container valve 5 are connected will be described. First, as shown in FIG. 2, the expanded diameter portion 61 on the gas pipe 6 side and the connection port 52 on the container valve 5 side are brought close to each other, and the gas passages are aligned so that they communicate with each other. Let Then, as mentioned above,
Since the gasket 7 is provided so as to further project from the tip of the connection port 52, the tip surface 62 of the expanded diameter portion 61 has a connection surface 52
To each other, and the gas flow paths communicate with each other in a state of contacting with the front end surface 71 of the gasket 7.

Then, the cap nut 64 is moved forward in such a state, and the screw portion 65 of the cap nut 64 and the connection port 52 are connected.
When it is tightened by screwing the screw portion 56 in
The pressing portion 64a of the cap nut 64 connects the expanded diameter portion 61 to the connection port 52.
It is pressed to the side, and the gasket 7 is crushed. As a result, the gasket 7 is compressed and expanded inward and outward in the radial direction, the minute gaps existing in the contact surface portion between the expanded diameter portion 61 and the connection port 52 and the gasket 7 are removed, and the groove portion 63 of the expanded diameter portion 61 is removed. Gasket 7 in a portion facing each other enters into, and airtightness is enhanced. Then, by tightening the cap nut 64 to a predetermined position, the expanded diameter portion 6
The joints between 1 and the connection port 52 and the gasket 7 are sealed with high airtightness, thus completing the connection between the gas pipe 6 and the container valve 5 in the state shown in FIG.

Thereafter, the gas pipe 6 is detached and attached in the reverse order of the above-mentioned steps, but the gasket 7 is strongly pressed and expanded to the outer edge side of the step portion 57, so that the gas pipe 6 is removed. Even at the moment when is removed, the force that extends toward the side wall inside the step portion 57 remains, and as a result, the gas pipe 6 and the gas pipe 6 do not come off from the step portion 57 and remain there.

As described above, according to the present embodiment, since the step portion 57 is formed at the tip of the connection port 52 of the container valve 5 and the gasket 7 is fitted therein, the gas pipe 6 is connected. When connecting to the container valve 5, the container valve 5
The gasket 7 is also attached to the connection port 52 side of the container valve 5 when removed from the container valve 5. Therefore, even when the tip corner portion or the expanded diameter portion 61 of the cap nut 64 on the gas pipe 6 side comes into contact with the connection port 52 during the attachment / detachment work, it is also referred to as a sealing region on the connection port 52 side (a contact surface sealed by the gasket 7 or the like). The area) is protected by the gasket 7, so that the sealing area is not scratched. Further, since the gasket 7 is closely fitted to the step portion 57, it can be easily removed, and its replacement can be easily performed.

By the way, the present invention is not limited to the above-mentioned embodiment, but may be configured as follows. First, in the second embodiment shown in FIG. 4, a step portion is not formed at the tip portion 81 of the connection port 8, and the shape of the gasket 82 is changed as shown in the drawing to obtain the same effect as that of the above-described embodiment. It is what That is, it is provided with a tubular portion 83 in which the gasket 82 is attached to the connection port 8, and a flange portion 84 provided so as to abut the tip surface 8a of the connection port 8 at the tip portion of the tubular portion 83. It has a different structure. Even in such a configuration, since the gasket 82 is attached to the connection port 8, the same action and effect are obtained.

On the other hand, in the third embodiment shown in FIG. 5, a ring-shaped groove 91 is formed in the distal end surface 9a of the connection port 9 along the circumferential direction.
Is formed, and a ring-shaped gasket (sealing material called a so-called o-ring) 92 is mounted in the groove 91. Also in the present embodiment, the gasket 92 is connected when the gas pipe 6 is connected. Is extended and fixed in the groove 91, the gasket 92 protects the seal area of the connection port 9 during the attachment / detachment work, and the replacement work can be easily performed, which is similar to the above-described embodiment. it can.

As can be seen from the above description, "the gasket is attached to the connection port side" in the claims means that the gas is screwed into the high pressure gas container valve via the cap nut. It means that the gasket is attached so that it will not come off from the connection port of the container valve when the pipe is attached or detached. It also expresses the shape of the gasket and the stepped portion or groove that is the fitting part. The term “ring-shaped” used in this case is not limited to a circular (true circle) shape, and includes an elliptical shape and a polygonal shape.

Further, the material of the gasket (or o-ring) is not limited to the fluororesin, and an elastic material such as rubber can be used as long as it has a certain deformability. Furthermore, in order to keep the gasket attached to the connection port of the container valve, it is not always necessary to form a step or groove on the tip surface of the connection port and fit the gasket here. For example, the portion of the gasket that contacts the tip side of the connection port is made of an adhesive material, and the expanded diameter side of the gas pipe is made of a non-adhesive or almost non-adhesive material, and the gas pipe is connected to the container valve. The scope of the present invention also includes a container valve in which a gasket has been attached to the connection port side by adhesion before.

[0023]

As described above, according to the present invention, it is possible to prevent the generation of scratches in the seal area of the gas container valve mounted on the high pressure gas container when the gas container valve is attached to or detached from the gas pipe.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall configuration of a high pressure gas container valve and a gas pipe connected to the valve according to the present embodiment.

FIG. 2 is a perspective view showing how the high-pressure gas container valve and the gas pipe are connected.

FIG. 3 is a vertical cross-sectional view showing a state where the connection is completed.

FIG. 4 is a schematic cross-sectional view showing a second embodiment.

FIG. 5 is a schematic cross-sectional view showing a third embodiment.

FIG. 6 is a vertical cross-sectional view showing an embodiment of a conventional container valve.

FIG. 7 is a perspective view showing how a container valve and a gas pipe are connected in the conventional invention.

[Explanation of symbols]

2 container valves 22 Connection port 24 Tip surface 3 gas piping 32 Tip surface 35 cap nut 4 high-pressure gas container 5 container valves 52 Connection port 57 steps 6 gas piping 63 groove 64 cap nut 7 gasket

Claims (4)

[Claims] 1. A connection port in which an outer peripheral surface is screwed to a cap nut externally fitted to a gas pipe, and a gasket is interposed between the cap nut and an enlarged diameter portion at the tip of the gas pipe to ensure airtightness. A high-pressure gas container valve equipped with a high-pressure gas container, wherein the gasket is attached to the connection port side. 2. A ring-shaped step portion, which is cut away from the inner peripheral edge toward the outer peripheral edge side, is formed at a portion of the connection port that is in contact with the ring-shaped front end surface, and a ring-shaped gasket is attached to this step portion. The high-pressure gas container valve according to claim 1, wherein 3. The gasket comprises a tubular portion attached to the connection port, and a collar portion provided so as to abut the end face of the connection port at the tip of the tubular portion. The high pressure gas container valve according to claim 1, which is characterized in that. 4. The high-pressure gas container according to claim 1, wherein a ring-shaped groove is formed along the circumferential direction on the end surface of the connection port, and a ring-shaped gasket is mounted in the groove. valve.