JPH0217280Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention is installed at the valve outlet of gas containers such as LP gas, and is used to prevent gas containers from falling due to large-scale earthquakes, heavy snowfall, typhoons, falling rocks, falling snow, etc. This product relates to a gas release preventer that prevents disasters by blocking the gas flow path and preventing gas from being released from the gas container in the event that gas supply equipment is damaged due to the impact of a falling object, etc. .

“Conventional technology” Conventionally, the fourth gas release preventer as described above has been used.
The structure shown in FIG. 5 and FIG. 5 is known. In the figure, numeral 1 indicates a gas release preventer, and numeral 2
1 shows a tubular main body constituting this gas release preventer 1. As shown in FIG. This main body 2 has a tube body 5 formed with a connecting contact portion 4 having an O-ring 3 at its tip.
and a connecting pipe 6 integrally connected to the base end of the tubular body 5.

A recess 7 is formed along the outer circumferential surface of the tube 5 between the connection contact portion 4 of the tube 5 and the connection portion between the tube 5 and the connecting tube 6.
A connecting screw tube 8 is fitted onto the outer surface of the tube so as to be rotatable in the circumferential direction. A male thread is carved into a front portion 8a of the outer peripheral surface (hereinafter referred to as a male thread portion) of the screw tube 8, and a rear portion 8b of the outer peripheral surface is formed into a nut shape, for example, as shown in the figure. This threaded pipe 8 is for connecting this gas release preventer 1 to the valve outlet of the gas container.The male threaded part 8a is screwed into the female threaded part of this valve outlet, and this is tightened. It is possible to connect them.

On the other hand, the proximal opening of the connecting tube 6 (on the right side of the figure)
A female screw is carved into the inner side 6a of the housing, so that it can be connected to gas supply equipment such as a high-pressure hose or a pressure regulator.

Further, a gas flow hole 9 is bored in the center of the main body 2. A tip enlarged diameter portion 10 is provided at the tip of the gas flow hole 9 in the tube body 5, and the formation of the tip enlarged diameter portion 10 creates an inflow side stepped portion 11a.
An outflow side step portion 11b is formed.

A sliding closing member 12 is slidably inserted into the central portion of the gas flow hole 9 in the tube body 5, and a locking cylinder 13 is slidably inserted into the base end thereof.

As shown in FIG. 6, the sliding closing member 12 includes a cylindrical sliding tube portion 14 whose tip end has a step and is reduced in diameter, and a sliding tube portion 14 that is connected to the sliding tube portion 14. 14 and a solid large-diameter tip portion 15 that is integrally attached so as to close the tip of the tip portion 14. A plurality of holes 14a are bored at the tip of the sliding tube 14, and these holes 14a
A gas flow passage 16 is formed within the sliding closure member 12 by the formation of the gas flow passage 16 . The large diameter portion 15 at the tip
is a solid part shaped like the head of a nail, and the neck has an O
- the ring 17 is attached;

As shown in FIG. 6, the locking cylinder 13 is a cylindrical member having a flange 13a on the outer circumferential surface of its proximal end and a locking reduced diameter portion 13b formed on the inner circumferential surface of its distal end. .

Large diameter portion 15 at the tip of the sliding closure member 12 configured as described above
As shown in FIG. 5, is located within the enlarged diameter end portion 10 of the gas flow hole 9, and its sliding cylinder portion 14 can slide into the gas flow hole 9 in the center of the tube body 5. It is located in

The locking cylinder 13 configured as described above is locked by a locking member 18 provided on the side of the connecting pipe 6. This locking member 18 is a cylindrical member with a pointed tip, and is bored into the side of the connecting pipe 6 via an O-ring fitted to the outer circumference of the locking member 18. It is slidably fitted into the mounting hole 19. The pointed portion of this locking member 18 is in contact with the flange 13a of the locking cylinder 13, and its base end protrudes outward from the connecting pipe 6 as shown in FIGS. 4 and 5. .

Further, a spring (biasing member) 20 is interposed between the sliding closing member 12 and the locking cylinder 13, and urges the sliding closing member 12 toward the tip of the tube body 5. There is. Therefore, the sliding closing member 12 does not move toward the locking cylinder 13 unless it receives an external force greater than the elastic force of the spring 20.

Therefore, in order to actually install the gas release preventer 1 having the above structure, as shown in FIG. For example, a high pressure hose 22 is connected to the high pressure hose 22. A pressure regulator 23 is connected to this high pressure hose 22, a gas meter 24 is connected to this pressure regulator 23, and the gas meter 24 is connected to each gas appliance. At this time, the male screw portion 8a of the screw tube 8 is completely housed within the valve outlet 21a of the gas container 21.
Therefore, the sliding closing member 12 also has the valve outlet 21.
It is located within a. After connecting the gas release preventer 1 as described above, in order to send gas from the gas container 21 to each gas appliance, first push the base end of the locking member 18 into the connecting pipe 6 and leave it in this state. Open the valve of the gas container 21. Once the gas has spread through each pipe, the pressure on the locking member 18 is released and the locking member 18 is allowed to return to its original position. By this operation, the first locking cylinder 13 is displaced in the direction of the sliding closing member 12 in FIG. 5, and locks the base end portion of the sliding closing member 12. In this state, high-pressure gas (pressure greater than the elastic force of the spring 20) flows from the gas container 21 into the gas flow hole 9, but as described above, the sliding closing member 12
3. Since the gas flow hole 9 is locked by the locking member 18, the gas flow hole 9 will not be blocked.
Therefore, the high pressure gas fills the gas flow hole 9 and the high pressure hose 23, and the pressure within the gas flow hole 9 becomes uniform. As a result, the pressing force on the locking member 18 is released, and the locking member 18 and the locking cylinder 13 are returned to their original positions by the biasing force of the spring 20 and the gas pressure in the gas flow hole 9. However, the sliding closing member 12 is not displaced and the gas flow is not obstructed, so that the gas can be supplied.

On the other hand, in FIG. 7, damage to the high-pressure hose 22, damage to the connection part of the pressure regulator 23, and connection to the metal pipe in front of the gas meter 24 is caused by the overturning of the gas container 21, falling rocks, falling snow, etc. caused by a large-scale earthquake, etc. If damage occurs and gas is suddenly released to the outside air, the gas flow rate in the gas flow hole 9 on the gas outlet side with the sliding closing member 12 as a boundary increases, and the sliding closing member 12 Since the pressure loss before and after becomes large, the sliding closing member 12 is caused by the high pressure gas from the gas container 21.
is moved toward the gas outflow side against the biasing force of the spring 20. As a result, the O-ring 17 of the large diameter end portion 15 of the sliding closing member 12 is inserted into the gas flow hole 9.
It is possible to lock and adhere to the inner outlet side step portion 11b to block the gas flow hole 9 and prevent the release of high-pressure gas.

Also, due to some cause such as falling rocks or falling snow, a large external force is applied to this gas release preventer.
Even if the connection between the pipe body 5 and the connecting pipe 6 breaks and gas is suddenly released, as described above,
Tube 5 and sliding closure member 12 within this tube 5
is stored in the valve outlet 21a of the gas container 21, and will remain in the valve outlet 21a even after breakage, so the sliding closing member 12 moves to the outside air side and the O-ring of the large diameter portion 15 at its tip 17 can be locked and tightly attached to the outflow side step portion 11b of the gas flow hole 9 to prevent gas from being released.

"Problems to be Solved by the Invention" By the way, the above-mentioned conventional gas release preventer has the following drawbacks, and it is necessary to solve them.

That is, when a gas appliance is ignited, a large amount of gas is instantly combusted, resulting in an excessive flow of gas within a short period of time. Therefore, the state immediately after ignition is
The situation is the same as when the connection part of the metal pipe in front of the gas meter 24 is momentarily damaged by the above-mentioned earthquake, falling rocks, falling snow, etc., and gas is suddenly released into the outside air. As a result, as described above, the O-ring 17 of the large diameter portion 15 of the sliding closure member 12
The inconvenience is that the gas is stuck to the outflow side step 11b in the gas distribution hole 9, blocking the gas distribution hole 9 and stopping the supply of gas to the gas appliance, making the gas appliance unusable. occurs.

Furthermore, the sliding cylinder portion 14, which occupies approximately half of the sliding closing member 12, is brought into sliding contact with the inner wall of the central portion of the gas distribution hole 9, thereby allowing the sliding closure member 12 to move on a coaxial line within the gas distribution hole 9. The portion consisting of the tip of the sliding cylinder portion 14 and the solid large-diameter tip large-diameter portion 15, which occupies the remaining half, is loosely fitted into the tip enlarged-diameter portion 10 of the gas flow hole 9. It's not supported anywhere. Therefore, in order to move the sliding closing member 12 smoothly within the gas distribution hole 9, it is necessary to improve the machining accuracy of the inner wall surfaces of the sliding cylinder portion 14 and the central portion of the gas distribution hole 9, which are in sliding contact with each other. .

``Purpose of the invention'' This invention was made in view of the above circumstances.
Its purpose is to react to the momentary overflow of gas that occurs during ignition, etc., and to prevent the flow path from being accidentally blocked, causing actual damage to the gas flow path and causing a continuous release of a large amount of gas. The object of the present invention is to provide a gas release preventer that only occasionally blocks its gas flow path.

"Means for Solving the Problem" A cylinder member having a bottomed cylindrical shape having a small hole for gas distribution that penetrates the peripheral wall in the axial direction is housed and fixed in the enlarged diameter portion at the tip of the gas distribution hole. The large-diameter tip of the sliding closing member that slides within the gas flow hole is formed into a cylindrical shape so that it fits loosely into the cylinder member.

"Function" In the above configuration, the cylindrical tip large diameter portion of the sliding closing member is loosely fitted into the cylinder member installed in the tip enlarged diameter portion of the gas flow hole, and the cylinder member and the tip large diameter portion form a piston structure. Therefore, the sliding closure member does not follow the gas pressure that is generated instantaneously, but only becomes cylindrical in response to the gas pressure that continuously acts, such as when the gas flow path is damaged. The large diameter portion of the tip moves relative to the cylinder member, blocking the gas flow path.

"Example" This invention will be explained in detail below using an example. Figure 1 shows an example of this invention.
In the figure, parts common to those in FIG. 5 are given the same reference numerals to simplify the explanation. Reference numeral 25 in the figure indicates the enlarged diameter portion at the tip of the gas flow hole 9;
5 has a longer length in the axial direction than the enlarged diameter portion 10 at the tip of the gas flow hole 9 in the conventional gas release preventer shown in FIG.

Further, the reference numeral 26 in the figure indicates a sliding closing member, and as shown in FIG. It is molded in almost the same shape as 12. That is, the sliding cylinder part 28 that slides into the central part of the gas flow hole 9 is shorter in the axial direction than the conventional sliding cylinder part 14, but has the same diameter, and has a hole at its tip as before. 28a is bored.

As shown in FIG. 1, there is a space between the cylindrical tip large diameter portion 27 and the tip enlarged diameter portion 25.
A cylinder member 29 having a cylindrical shape with a bottom is interposed and fixed to the inner wall of the enlarged diameter portion 25 . The inner diameter of this cylinder member 29 is the same as that of the sliding closing member 2.
The outer diameter of the cylinder member 29 is set to be somewhat larger than the outer diameter of the large-diameter tip portion 27 of No. 6, and the large-diameter tip portion 27 is loosely fitted into the cylinder member 29. Moreover, as shown in FIG. 3, this cylinder member 2
A groove-shaped small hole 29 is formed on the outer circumferential surface of the wall 9 to form a gas flow passage between the inner circumferential surface and the enlarged diameter portion 25.
a... is formed.

However, in the above configuration, the gas distribution hole 9
The cylindrical large-diameter tip 27 of the sliding closing member 22 is loosely fitted into the cylinder member 29 installed in the enlarged-diameter tip 25 of the cylinder member 29, and the cylinder member 29 and the large-diameter tip 27 form a piston structure. ing. Therefore, the sliding closing member 26 is connected to the cylinder member 29.
On the other hand, in order to move to the gas outflow side, gas must be introduced into the cylinder member 29, which is in a reduced pressure state, through the gap between the cylinder member 29 and the large-diameter tip portion 27. Therefore, the sliding closure member 26 cannot be moved suddenly. the result,
When a large amount of gas momentarily flows during ignition, etc., the sliding closing member 26 does not move accordingly, and the gas flows through the small holes 29a of the cylinder member 29, and immediately thereafter, When the gas flow rate returns to a normal value, the sliding closing member 26 remains unchanged and does not unnecessarily block the gas flow hole 9. Conversely, some part of the gas flow path may be damaged,
If a large amount of gas flows out, the large diameter portion 27 at the tip will
Although the displacement does not occur immediately, in this case the gas flows continuously, so the cylinder 2 is moved with a certain delay.
Displaced relative to 9. As a result, the sliding closure member 26
This will block the gas flow hole 9 and ensure safety.

Further, in the above configuration, the sliding closing member 26
is the central part of the gas flow hole 9 and the cylinder member 2.
Since it is supported at two locations 9, its sliding is smooth. Furthermore, since the sliding closing member 26 has a structure in which it is supported at two places as described above, it can function satisfactorily without increasing the machining accuracy of each sliding contact portion.

"Effect" As explained above, the gas release preventer according to this invention does not react incorrectly to the instantaneous overflow of gas that occurs at the time of ignition, etc., and does not block the flow path. The gas flow path can be shut off only when the gas flow path is actually damaged and a large amount of gas is continuously released, and it is easy to manufacture.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of this invention, in which Figure 1 is a side cross-sectional configuration diagram, Figure 2 is a perspective view of the sliding closing member which is the main part of this invention, and Figure 3 is a perspective view of the cylinder member which is the main part of this invention, and Figures 4 to 7 show a conventional gas release preventer, where Figure 4 is a side view, Figure 5 is a side sectional view, and Figure 6 is a side view. The figure is a perspective view of the main parts, and FIG. 7 is a gas flow path diagram showing an example of use of the gas release preventer. 2...Main body, 9...Gas distribution hole, 11a...Inflow side step, 11b...Outflow side step, 20...Spring (biasing member), 25...Tip enlarged diameter part, 26...Sliding closing member, 27...Tip Large diameter part, 28...Sliding cylinder part, 29...
Cylinder member, 29a...small hole.

Claims (1)

[Claims for Utility Model Registration] Inside a tubular body, the tip of which is connected to the valve outlet of the gas container and the base end of which is connected to gas supply equipment, a tip enlarged diameter portion and a tip enlarged diameter portion. A gas flow hole having an inflow side and an outflow side stepped portion is thus formed, and a sliding closing member having a gas flow passage formed from the side surface near the distal end to the proximal end face is connected to the large diameter portion at the distal end. is disposed within the main body so as to be movably located within the enlarged diameter portion at the distal end, and its sliding cylinder portion is slidably inserted into the gas flow hole, and the slide closing member is disposed within the gas flow hole. A biasing member is provided that biases the gas toward the gas container side with a predetermined elastic force, and the pressure difference between the gas pressure flowing into the main body and the gas pressure flowing out from the main body exceeds a predetermined pressure. When the sliding closure member moves toward the proximal end of the main body, the large-diameter tip portion locks into tight contact with the stepped portion on the outflow side of the enlarged-diameter tip portion to prevent release of high-pressure gas. In the gas release preventer, the large-diameter tip portion is formed into a solid cylindrical shape, and a bottomed cylindrical cylinder member in which a small hole for gas circulation passing through the peripheral wall in the axial direction is provided inside the cylinder member. A gas release preventer characterized in that a large diameter portion of a cylindrical tip is fixed in a large diameter portion of the tip of the gas distribution hole in a loosely fitted manner.