JP7160303B2 - How to assemble a pressure-accumulator fire extinguisher - Google Patents

Description

The present invention relates to an accumulator fire extinguisher.

In an accumulator fire extinguisher, an internal pressure of about 0.7 to 0.98 MPa always acts on the container. Therefore, the opening of the container is mainly sealed with a packing made of a rubber material.
By the way, the container is filled with a corrosive fire extinguishing agent. Since containers are generally made of metal materials such as iron, steel, and aluminum, the inner surface of the container is subjected to antirust treatment such as painting to prevent corrosion (for example, Patent Document 1).

JP-A-2003-164539

When performing rust prevention treatment on the inner surface of the container, it is necessary to perform chemical conversion treatment (for example, phosphate coating treatment, etc.) on iron, steel, and aluminum as a base treatment to improve surface properties such as adhesion of paint. . As described above, there are many steps from surface treatment to rust prevention treatment. Further, if there are pinholes in the coating film adhered to the inner surface of the container due to surface treatment, corrosion may progress. Therefore, antirust treatment requires a great deal of time and cost.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an accumulator fire extinguisher that simplifies the antirust treatment of the inner surface of the container and omits the packing for sealing the container.

In order to solve the above-described problems, the present invention provides a metal container having a mouth, a bag made of polymer material stored in the container, a fire extinguishing agent filled in the bag, and the bag Compressed gas sealed inside, and a valve attached to the mouth and ejecting the extinguishing agent in the container to the outside according to a user's lever operation, the bag comprising a bag body, An accumulator fire extinguisher characterized by comprising a rim that is formed thicker than the bag body and is sandwiched between the mouth of the container and the valve to seal the mouth. offer.

In the pressure-accumulator fire extinguisher of the present invention having the configuration as described above, it is preferable that the volume of the bag under normal pressure is 1.0 times or more and 1.5 times or less the volume of the container.

Moreover, in the pressure-accumulator fire extinguisher of the present invention having the configuration as described above, it is preferable that the edge portion of the bag has a thickness of 1.0 mm or more.

Moreover, in the pressure-accumulator fire extinguisher of the present invention having the configuration as described above, it is preferable that the bag body has a hardness of 15 degrees or more and 40 degrees or less.

Further, in the pressure accumulator fire extinguisher of the present invention having the configuration as described above, the compressed gas contains helium gas, and the rim has a density of 2.6×10 ^{−8 -17} . It preferably exhibits a gas permeability of 5×10 ⁻⁸ [cc·cm/cm ² ·sec·atm].

Further, in the pressure accumulator fire extinguisher of the present invention having the configuration as described above, the compressed gas further contains nitrogen gas, and the edge portion is 0.17×10 ⁻⁸ to 5% of nitrogen at 25° C. It preferably exhibits a gas permeability of 0.9×10 ⁻⁸ [cc·cm/cm 2 ·sec·atm].

ADVANTAGE OF THE INVENTION According to this invention, the packing for sealing a container can be abbreviate|omitted while simplifying the rust prevention process of the container inner surface of a pressure-accumulator fire extinguisher. This makes it possible to reduce the manufacturing cost of the fire extinguisher.

It is a sectional view of fire extinguisher 1 concerning a representative embodiment of the present invention. Figure 2 is a schematic view of the container 11 and bag 15 included in the fire extinguisher of Figure 1; 4 is a diagram showing an example of how the bag 15 is inserted into the container 11. FIG. 4 is a diagram showing an example of a state in which a bag 15 is attached to the container 11; FIG. 4 is a diagram showing an example of how the valve 13 is attached to the container 11. FIG.

Hereinafter, a fire extinguisher according to a representative embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings. Moreover, since the drawings are for conceptually explaining the present invention, the dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

The configuration of the fire extinguisher according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG.
The fire extinguisher 1 is of an accumulator type and includes a container 11 , a valve 13 , a bag 15 , a fire extinguishing agent 19 , a lever 21 and a hose 25 . Compressed gas is enclosed in the container 11, and a predetermined internal pressure is acting thereon.

The container 11 is metallic and may be made of, for example, iron, steel, aluminum or alloys thereof. The container 11 has, for example, a bottomed cylindrical shape as shown in FIG. 2(a), and is designed to withstand a predetermined internal pressure (for example, about 1 MPa).

The inner surface of the container 11 may be subjected to antirust treatment, or may be omitted. Moreover, even if the inner surface of the container 11 is subjected to antirust treatment, the antirust treatment may be simplified because the fire extinguishing agent 19 does not directly contact the inner surface of the container 11 as will be described later.

The container 11 has a tubular mouth 12 . A bag 15 and a fire extinguishing agent 19 are inserted into the container 11 through the mouth 12 . Although not shown in the drawing, the valve 13 is attached to the mouth 12 by engaging the thread on the outer peripheral surface of the mouth 12 with the thread groove on the inner peripheral surface of the valve 13. become.

The container 11 accommodates a bag 15 made of polymeric material. The polymeric material may be resin or rubber. The bag 15 is flexible enough to be inserted into the container 11 through the mouth 12 and has corrosion resistance to the fire extinguishing agent 19 .

The bag 15 has a balloon-like outer shape as a whole, and may have a shape corresponding to the inner surface of the container 11 as shown in FIG. 2(b), for example. The bag 15 has a bag body 16 and an edge portion 17 formed thicker than the bag body 16 . Details of the bag 15 will be described later.

Returning to FIG. 1, the bag 15 is filled with a powdered or liquid fire extinguishing agent 19 . Therefore, the bag 15 is interposed between the container 11 and the fire extinguishing agent 19, and is designed so that the container 11 and the extinguishing agent 19 do not come into direct contact with each other. In addition to the fire extinguishing agent 19, the bag 15 inserted into the container 11 is filled with a high-pressure inert gas (compressed gas). In this embodiment, nitrogen gas and helium gas are assumed as the inert gas, but the inert gas is not limited to this.

A valve 13 is attached to the mouth portion 12 of the container 11 . The valve 13 seals the inside of the container 11 and causes the extinguishing agent 19 in the container 11 to be jetted through the hose 25 in accordance with the user's lever operation. Sealing within the container 11 is achieved by the valve 13 sandwiching the rim 17 of the bag 15 and the mouth 12 of the container 11 .

A siphon pipe 23 is connected to the valve 13 for guiding the fire extinguishing agent 19 in the container 11 (bag 15 ) to the valve 13 . A hose 25 having a nozzle 27 at its tip is connected to the valve 13 .

A lever 21 is attached to the upper end of the valve 13 . When the lever 21 is closed, the valve 13 is opened, the siphon pipe 23 and the hose 25 are communicated, and the extinguishing agent 19 is jetted from the nozzle 27 .

The bag 15 will now be described in detail.
The bag 15 can be made of a polymeric material such as resin or rubber, as described above, but is a soft bag and has a thickness sufficient to seal the opening 12 of the container 11 at the edge 17. It is an integrally molded product with That is, the bag 15 has both functions of sealing the container 11 and preventing the inner surface of the container 11 from rusting. This eliminates the need for antirust treatment on the inner surface of the container 11, and even if not, a simplified antirust treatment suffices. This contributes to a reduction in time and costs for manufacturing fire extinguishers.

In this embodiment, the bag 15 is preferably a soft bag like a rubber balloon, and preferably made of rubber such as acrylonitrile-butadiene rubber (for example, acrylonitrile 27%, 39%). is not limited to Other resins or rubbers include polyethylene, polypropylene, polyvinyl chloride, ethylene-propylene rubber, styrene rubber, fluororubber, butyl rubber, and the like.

The bag 15 used in this embodiment preferably satisfies the following conditions.
(1) Volume of bag 15:
A predetermined internal pressure always acts on the bag 15 in the container 11 . In this state, if the bag 15 expands beyond the volume V2 under normal pressure (that is, the volume of fluid or powder that the bag 15 can accommodate under normal pressure), the bag 15 breaks or breaks. There is a possibility that a problem may occur in the durability of the bag 15. In order to suppress the expansion of the bag 15, the condition is that the volume V2 of the bag 15 is equal to or larger than the volume V1 of the container 11 when the bag 15 is not inflated, that is, under normal pressure.

Conversely, if the volume V2 of the bag 15 under normal pressure is too large compared to the volume V1 of the container 11, the bag 15 wrinkles (that is, folds up) within the container 11. If an attempt is made to radiate the fire extinguishing agent 19 in this state, the bag 15 may be sucked into the siphon tube 23 and the radiation of the extinguishing agent 19 may be hindered. Moreover, in the process of assembling the fire extinguisher 1, it may become difficult to insert the bag 15 into the container 11, or the bag 15 may be damaged when the siphon tube 23 is inserted.

Considering these factors, it is desirable to determine the volume V2 of the bag 15 under normal pressure so that the volume V2 is within the range of 1.0 to 1.5 times the volume V1 of the container 11 . That is, it is preferable that there is a relationship of 1.0×V1≦V2≦1.5×V1 between the volumes V1 and V2.

(2) Thickness of Edge 17:
In the bag 15 of this embodiment, the rim 17 is formed thicker than the bag main body 16, and such rim 17 is used as a sealing material for the container 11 (mouth 12). In order to satisfy the predetermined sealing performance required for an accumulator fire extinguisher, the thickness T1 of the edge portion 17 is preferably 1.0 mm or more under normal pressure, and more preferably 2.0 mm or more.

(3) Thickness of bag body 16:
The thickness T2 of the bag body 16 is desirably less than 1 mm in consideration of the above-described problems in assembling the fire extinguisher 1 . Moreover, considering the resistance to tearing during assembly, it is desirable that the thickness T2 of the bag body 16 is 0.02 mm or more.
Therefore, there is a relationship of T1>T2 between the thicknesses T1 and T2. Furthermore, it is preferable that T1>2×T2 in order to achieve both the ease of storing the bag 15 in the container 11 and the sealing performance described above.

(4) Hardness (hardness):
It is preferable that the bag 15 has a certain flexibility so that the bag 15 can be easily inserted into the container 11 . A preferable range of hardness (hardness) of the bag 15 is 15 degrees or more and 40 degrees or less. If the hardness of the bag 15 is less than 15 degrees (that is, if the bag 15 is too soft), the production of the bag 15 becomes difficult and the production cost increases, which is not practical for fire extinguishers. On the other hand, when the hardness of the bag 15 exceeds 40 degrees, the bag 15 is too hard to be suitable for assembly.
Furthermore, from the viewpoint of compatibility between versatility, assembling efficiency and manufacturing cost, the hardness of the bag 15 is preferably 25 degrees or more and 35 degrees or less.

(5) Gas Permeability of Edge 17:
When a gas containing helium and nitrogen is employed as the compressed gas, the edge 17 is 2.6×10 ⁻⁸ to 17.5×10 ⁻⁸ [cc·cm] for helium at 25° C. /cm ² · sec · atm], and 0.17 × 10 ^-8 to 5.9 × 10 ^-8 [cc · cm / cm ² · sec · atm] for nitrogen (gas permeation amount ) should be indicated respectively. Here, according to the practice in this technical field, the gas permeability is defined as the ^volume ( cc).

Specifically, the bag 15 needs to contain compressed gas (including nitrogen and helium) for pushing out the fire extinguishing agent 19 . Considering the sealing performance of the container 11 (the opening 12), the gas permeability of the edge 17 of the bag 15 is 17.5×10 ⁻⁸ [cc·cm/cm ² · sec·atm] or less, and 5.9×10 ⁻⁸ [cc·cm/cm ² ·sec·atm] or less for nitrogen.

On the other hand, the gas permeability of edge 17 need not be less than 2.6×10 ⁻⁸ [cc·cm/cm ² ·sec·atm] to helium and 0.17 to nitrogen. It need not be less than ×10 ⁻⁸ [cc·cm/cm ² ·sec·atm]. Such gas permeability is considered to be excessive for the performance required of an accumulator fire extinguisher.

The edge 17 having gas permeability is equivalent to the packing used in a conventional pressure-accumulator fire extinguisher in terms of the amount of gas permeation per unit area and per thickness of the edge 17. can be substituted.

Next, the procedure for assembling the fire extinguisher 1 according to this embodiment will be described with reference to FIGS. 3 to 5. FIG.
First, the container 11 is prepared. The inner surface of the container 11 may or may not be subjected to rust prevention treatment, but since the bag 15 is interposed between the fire extinguishing agent 19 and the container 11, the rust prevention treatment is more effective than the conventional pressure storage fire extinguisher. Concise and good. Therefore, it is possible to reduce the time and cost required for the antirust treatment.

Next, as shown in FIG. 3, the bag 15 is inserted through the opening 12 of the container 11 . Since the bag 15 has sufficient flexibility, the bag 15 can be smoothly inserted into the container 11 . In addition, since the volume V2 of the bag 15 under normal pressure is a predetermined magnification (1.0 or more and 1.5 or less) with respect to the volume V1 of the container 11, it is difficult to insert the bag 15 into the container 11. , and the bag 15 does not excessively fold inside the container 11 . At this time, the edge 17 of the bag 15 is exposed from the mouth 12 of the container 11 as shown in FIG.

Then, the extinguishing agent 19 is injected from the edge 17 of the bag 15 .
In this state, the integrated valve 13, lever 21 and siphon tube 23 are inserted into the bag 15 as shown in FIG. At this time, since the bag 15 is not excessively folded inside the container 11, it is possible to prevent the bag 15 from being damaged by the tip of the siphon tube 23, for example.

Then, the valve 13 is screwed into the mouth portion 12 of the container 11 and fixed. At this time, the edge portion 17 of the bag 15 is sandwiched between the valve 13 and the mouth portion 12, and the inside of the container 11 is sealed. Therefore, sealing materials such as packing can be omitted.
After that, when the compressed gas is sealed inside the container 11 (the bag 15) and the hose 25 is attached, the fire extinguisher 1 is completed.

Although representative embodiments of the present invention have been described above, the present invention is not limited to these, and various design changes are possible and included in the present invention.

1... fire extinguisher,
11 Container,
12 Mouth,
13 valve,
15 bags,
16... bag body,
17 Edge,
21 Lever,
25 Hose.

Claims (3)

a metal container having a mouth;
a bag made of polymeric material to be housed in the container;
A fire extinguishing agent filled in the bag;
a compressed gas enclosed within the bag;
A valve mounted on the mouth and ejecting the fire extinguishing agent in the container to the outside according to the user's lever operation,
The bag is
a bag body;
a rim formed to be thicker than the bag body and sandwiched between the mouth of the container and the valve to seal the mouth;
including
The volume of the bag under normal pressure is 1.0 times or more and 1.5 times or less the volume of the container,
the rim of the bag has a thickness of 1.0 mm or more;
The bag body has a hardness of 15 degrees or more and 40 degrees or less ,
A method for assembling a pressure- accumulator fire extinguisher,
After housing the bag in the container, the extinguishing agent is injected into the bag, and then the rim of the bag is sandwiched between the valve and the mouth of the container, and then the bag is filled with the fire extinguishing agent. enclosing the compressed gas;
A method for assembling a pressure-accumulator fire extinguisher characterized by: the compressed gas comprises helium gas;
The edge exhibits a gas permeability of 2.6×10 ⁻⁸ to 17.5×10 ⁻⁸ [cc·cm/cm ² ·sec·atm] against helium at 25° C.;
The method for assembling the pressure-accumulator fire extinguisher according to claim 1, characterized by: the compressed gas further comprises nitrogen gas;
The edge exhibits a gas permeability of 0.17×10 ⁻⁸ to 5.9×10 ⁻⁸ [cc·cm/cm ² ·sec·atm] to nitrogen at 25° C.;
The method for assembling the pressure-accumulator fire extinguisher according to claim 1, characterized by:

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