JPH0738900U - Safety valve for small pressure vessels - Google Patents

Abstract

(57) [Summary] [Purpose] Completely prevent gas from leaking before discarding the container, and release gas when heated when discarding. A safety valve for a small pressure vessel having a stem 6 which is urged by a spring 2 in a direction projecting from the container and which has a side opening 4 communicating with a nozzle 3 at a tip and which is openably and closably closed by a stem color bar 5 surrounding the nozzle. is there. Nozzle 3
A gas escape port 7 is formed through the stem 6 and the outside of the stem, and a part of the stem constituent member is formed of a molten material that melts at a set temperature. To the nozzle 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety valve for a small pressure vessel, which is commonly called a cylinder or cartridge.

[0002]

[Prior art]

 When this kind of container is thrown into a fire, there is a risk of causing an explosion accident, so measures to avoid it are desirable. The applicant of the present invention has been conducting research for some time, but some of them have already been patented, and an example thereof is the invention of Japanese Examined Patent Publication No. 4-34049. The present invention has a structure in which a gas passage communicating with a gas ejection port of a stem, that is, a nozzle is formed, and a melting member made of a low-melting alloy or synthetic resin is filled therein. However, it was pointed out that even if the molten material was filled in the gas passage, there was still concern about the sealing performance. This is because if the gas is not completely sealed, gas may escape, and the internal volume may decrease even if it is unused. Further, since the invention mainly has a structure in which a molten member is filled in a portion adjacent to the stem rubber, a structure around the stem rubber attachment portion becomes complicated and a problem in mass production as a product is pointed out.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above points, and its problem is that it can prevent gas leakage before the container is completely discarded, facilitates the manufacture, and is suitable for being incorporated into a small pressure container. Is to be given.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, the present invention is urged by a spring 2 in a direction projecting from one end of a member 1 constituting a container, and a side opening 4 communicating with a nozzle 3 at a tip surrounds the stem rubber 5. A safety valve for a small pressure vessel having a stem 6 that can be opened and closed by means of a gas escape port 7 through the nozzle 3 and the outside of the stem, is opened in the stem 6, and is in contact with the gas escape port 7, and the stem 6 The member that forms a part of the above is melted at a set temperature and is formed by a molten material that opens the escape port 7.

[0005]

【Example】

 1 and 2 relate to Embodiment 1 of a safety valve for a small pressure vessel (see FIG. 4) according to the present invention.

The container has a vertically long cylindrical shape, and a member called a mounting cup is provided at the top of the container, and the upper half portion of the stem 6 projects from a hole 13 at the center thereof so as to be pushed. That is, the stem 6 is biased in the protruding direction by the spring 2 set in the housing 12, and in this state, the side opening 4 is closed by the stem rubber 5 surrounding it, and when the stem 6 is pushed in, the stem rubber 5 is pushed. By deforming downward, the gas in the container can be discharged from the opening 4 to the nozzle 3.

In the first embodiment, the stem 6 is formed by a shaft body 8 having the nozzle 3 opened at the tip and a cylindrical body 9 fitted to the outside of the shaft body 8 to receive the spring 2. The bottom of the nozzle 3 is in the vicinity of the opening 4 of the shaft body 8, the cylinder 9 is fitted inside the container than the opening 4, and the stem is located inside the opening 4 and covered by the cylinder 9. It forms a gas escape port 7 that can pass through the outside and the nozzle 3.

The tubular body 9 is fitted to the shaft body 8 as described above, and is integrated with the shaft body 8 by caulking shown by reference numeral 14 in order to maintain the positional relationship. Reference numeral 15 is a seal member, which is interposed inwardly between the shaft body 8 and the cylinder body 9 by the gas escape port 7, and an O-ring can be used.

The tubular body 9 is formed of a molten material so as to melt at a set temperature when the container is heated and open the escape port 7. As a molten material satisfying this purpose, a low melting alloy such as tin, lead, zinc, bismuth or antimony can be used. Reference numeral 16 represents a siphon tube.

The safety valve of the second embodiment is shown in FIG. 3, and in this example, the opening 4 also serves as the gas escape port 7. That is, a part 10 (left half in FIG. 3) of the lower half part of the stem 6 located inside the opening 4 and the remaining part 11 are formed by a bonding structure of different materials. Such a stem 6 is usually manufactured by processing a metal material, but another part of the stem 6 is manufactured by cutting a part of the stem 6, and a part made of a molten material is bonded to the cut part. It should be one. As the bonding means, insert molding, adhesion of another component, welding, or the like can be appropriately performed.

In the safety valve of the present invention thus configured, when the small pressure vessel equipped with the safety valve is heated to reach the set temperature, the tubular body 9 constituting the stem 6 or a part 10 of the shaft portion of the stem 6 is formed. Is formed of a molten material, it is melted by heat and the gas escape port 7 is opened. As a result, the gas in the container is discharged through the gas escape port 7 (in the case of the second embodiment, the opening 4 changes to the escape port 7) and the nozzle 3 without passing through the opening 4.

[0012]

[Effect of device]

 Since the present invention is constructed and operates as described above, it is possible to construct a safety valve that operates reliably by slightly modifying the stem 6 itself, and therefore it is easy to implement and a small pressure vessel. It has the effect of having a practicality suitable for being incorporated into.

[Brief description of drawings]

FIG. 1 is a first embodiment of a safety valve for a small pressure vessel according to the present invention.
FIG.

FIG. 2 is an enlarged sectional view of a main part of the above.

FIG. 3 is a vertical sectional view showing a second embodiment according to the present invention.

FIG. 4 is a side view of the upper half of the small gas container according to the present invention.

Claims (3)

[Scope of utility model registration request] 1. A spring 2 is biased in a direction projecting from one end of a member 1 constituting a container, and a side opening 4 communicating with a nozzle 3 at a tip end is openably and closably closed by a stem rubber 5 surrounding it. A safety valve for a small pressure vessel having a stem 6, wherein a gas escape port 7 passing through the nozzle 3 and the outside of the stem is opened in the stem 6, is in contact with the gas escape port 7, and constitutes a part of the stem 6. A safety valve for a small pressure vessel, characterized in that a member is melted at a set temperature and is made of a molten material that opens the escape port 7. 2. The stem 6 comprises a shaft body 8 having a nozzle 3 opened at the tip thereof, and a cylinder body 9 fitted to the outer periphery of the shaft body 8 for receiving the spring 2, and a shaft sealed by the cylinder body 9. The safety valve for a small pressure vessel according to claim 1, wherein the body 8 is provided with a gas escape port 7, and the cylindrical body 9 is made of a molten material. 3. The stem 6 is formed by a structure in which a part 10 of the stem 6 located inside the opening 4 and the remaining part 11 are made of different materials, and the part 10 of the stem is made of a molten material. The safety valve for a small pressure vessel according to claim 1.