JP7229522B2 - Fire extinguisher and fire extinguisher manufacturing method - Google Patents

Description

The present invention relates to a fire extinguisher and a method for manufacturing a fire extinguisher.

A metal container of a fire extinguisher is composed of a plurality of parts such as a mouthpiece, a body plate, and a bottom plate, and these parts, for example, the mouthpiece and the body plate (upper end plate), are joined by welding. (For example, Patent Document 1).

JP-A-2002-272868, paragraph 0008

In order to ensure the airtightness and watertightness of the fire extinguisher, it is necessary to overlap the starting points of the welds, but the appearance of the overlapping welded points is worse than that of the other welded points. Thus, there is room for improvement in the means of joining parts of fire extinguisher containers.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fire extinguisher and a method of manufacturing the same, which can maintain a good appearance at joints of a container while ensuring sufficient airtightness and watertightness of the container.

In order to solve the above-described problems, the present invention provides a fire extinguisher comprising a cylindrical metal container, a fire extinguishing agent contained in the metal container, and a valve for ejecting the fire extinguishing agent to the outside of the metal container. The metal container has a cylindrical body plate at an upper end having a first diameter, and an open end having a second diameter smaller than the first diameter and connected to the upper end of the body plate. a cylindrical mouthpiece provided at the open end and having a groove along the end surface facing the upper surface of the open end; and a brazing material filling the gap between the open end and the mouthpiece and the groove. To provide a fire extinguisher characterized by comprising: Here, the body plate and the connecting portion may be separate members or integrally formed.

In the fire extinguisher of the present invention having the configuration as described above, it is preferable that the groove is annular.

Further, the present invention is a method for manufacturing a fire extinguisher comprising a cylindrical metal container, a fire extinguishing agent contained in the metal container, and a valve for ejecting the fire extinguishing agent to the outside of the metal container, , as a material of the metal container, a cylindrical body plate having a first diameter; a connecting portion having an open end having a second diameter smaller than the first diameter; A cylindrical base having grooves along different end faces and a brazing material having a shape corresponding to the groove are prepared, and the base is placed on the open end while the brazing material is fitted in the groove. a step of placing a coil inside the opening end, energizing the coil, melting the brazing material by electromagnetic induction heating of the connection portion and the mouthpiece, and joining the connection portion and the mouthpiece There is also provided a method of making a fire extinguisher comprising: Here, the body plate and the connecting portion may be separate members or integrally formed.

In the manufacturing method of the fire extinguisher of the present invention having the configuration as described above, it is preferable to prepare a die having an annular groove as the die and an annular brazing material as the brazing material.

ADVANTAGE OF THE INVENTION According to this invention, the fire extinguisher which can keep the external appearance of the joint part of a container favorable while ensuring sufficient airtightness and watertightness of a container, and its manufacturing method can be provided.

It is a sectional view showing roughly fire extinguisher 1 concerning this embodiment. 2 is an enlarged cross-sectional view of a metal container 2 that constitutes the fire extinguisher 1. FIG. 2 is an exploded view of the metal container 2 before brazing; FIG. 4 is a conceptual diagram of brazing of the metal container 2. FIG. 4 is a conceptual diagram showing an example of a heating range in brazing the metal container 2. FIG.

Hereinafter, a fire extinguisher and a manufacturing method thereof according to representative embodiments 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.

<<fire extinguisher>>
The configuration of the fire extinguisher according to this embodiment will be described. Here, the fire extinguisher is described as being of the accumulator type, but the present invention is also applicable to pressurized fire extinguishers.
A fire extinguisher 1 includes a metal container 2, an extinguishing agent 3, a valve 4, a lever 5 and a hose 6, as shown in FIG. Compressed gas is enclosed in the metal container 2, and a predetermined internal pressure (for example, about 1 MPa) is acting.

The metal container 2 has a bottomed cylindrical shape and is designed to withstand a predetermined internal pressure. The metal container 2 is made of a metal material such as iron, steel, stainless steel, or alloys thereof. Such metal material is suitable for electromagnetic induction heating and has a higher melting point than brazing material. shall have

Specifically, the metal container 2 includes a shell plate 11 , a connecting portion (upper end plate) 13 , a lower end plate 15 and a mouthpiece 17 .
The body plate 11 is a cylindrical body having an inner diameter D1 (first diameter), and is integrated (joined) with the connection portion 13 and the lower end plate 15 by welding or the like.

The connecting portion 13 is a member or portion that connects the body plate 11 and the mouthpiece 17 , and may be formed integrally with the body plate 11 or may be a separate member from the body plate 11 . As shown in FIGS. 1 and 3 , the connecting portion 13 is connected to one end of the body plate 11 and has an open end 23 with a diameter D2 (second diameter) smaller than the inner diameter D1 of the body plate 11 . Therefore, the diameter of the connection portion 12 is reduced from the connection end 21 with the body plate 11 toward the opening end 23 .

The base 17 is a member to which the valve 4 is attached, and is provided outside the open end 23 . As shown in FIG. 3A, the outer diameter D3 of the mouthpiece 17 is larger than the diameter D2 of the open end 23 (that is, D3>D2). In addition, the inner diameter D4 of the mouthpiece 17 may be larger or smaller than the diameter D2 of the open end 23, but from the viewpoint of reliable joining, it is preferable that D4<D2. Moreover, from the viewpoint of increasing the bonding area, it is preferable that the inner surface side portion 28 of the end portion of the mouthpiece 17 on the opening end 23 side protrudes toward the opening end 23 .

Base 17 also has a groove 27 for receiving brazing material 29 along an end face 25 opposite open end 23 . The groove 27 is formed along the end face 25, and is preferably annular.

The connecting portion 13 and the base 17 are joined by brazing material 29 . That is, the gap between the opening end 23 of the connecting portion 13 and the mouthpiece 17, including the groove 27, is filled with the brazing filler metal 29, thereby ensuring the airtightness of the metal container 2. . However, the brazing filler metal 29 does not have to spread all over the gap between the opening end 23 and the mouthpiece 17 and the groove 27 in the width direction as long as the airtightness of the metal container 2 can be ensured.

The brazing material 29 may be of any type as long as it has a melting point lower than that of the material of the metal container 2 and satisfies required bonding properties (such as bonding strength). preferred. For example, silver brazing may include 45% silver, 30% Cu, and 25% Zn, and copper brazing may include 5% silver, 89% Cu, and 6% Zn.

Returning to the description of the fire extinguisher 1 , the metal container 2 is filled with a powdered or liquid fire extinguishing agent 3 . In the metal container 2, in addition to the fire extinguishing agent 3, a high-pressure inert gas (compressed gas) is enclosed. Examples of inert gases include nitrogen gas and helium gas.

A valve 4 is attached to a mouthpiece 17 of the metal container 2 . The valve 4 seals the metal container 2 and ejects the extinguishing agent 3 in the metal container 2 to the outside through the hose 6 according to the user's lever operation. A siphon tube 7 is connected to the valve 4 for guiding the extinguishing agent 3 in the metal container 2 to the valve 4 .

A lever 5 is attached to the upper end of the valve 4 . When the lever 5 is closed, the valve 4 is opened, the siphon pipe 7 and the hose 6 are communicated, and the fire extinguishing agent 3 is jetted from the hose 6. - 特許庁

<<Manufacturing method of fire extinguisher>>
Next, a method for manufacturing the fire extinguisher 1 will be described, particularly centering on the manufacturing process of the container 1 .
First, as materials for the metal container 2, the shell plate 11, the connecting portion 13, the lower end plate 15, the mouthpiece 17, and the brazing material 29 are prepared. Here, the shell plate 11 and the connecting portion 13 are described as being separate members, but the shell plate 11 and the connecting portion 13 may be integrally formed as described above. Further, it is assumed that the groove 27 of the mouthpiece 17 is formed in an annular shape, and the brazing material 29 is also assumed to be annular.

A brazing material 29 is then placed between the base 17 and the open end 23 . For example, the base 17 is placed on the opening end 23 of the connecting portion 13 with the brazing material 29 in contact with the groove 27 of the base 17 (see the positional relationship in FIG. 3A) or in the groove 27 . Since the base 17 has the grooves 27 , the brazing material 29 can be easily positioned, and the brazing material 29 can be arranged at a position closer to the coil 31 . At the same time, in order to increase the wettability and adhesion of the brazing filler metal 29, flux may be applied to the joint surface between the connecting portion 13 and the mouthpiece 17. FIG.

Then, the coil 31 is arranged inside the connecting portion 13 . The coil 31 is preferably arranged at a position where electromagnetic induction heating, which will be described later, can be efficiently performed, and particularly preferably directly below the opening end 23 (on the side of the body plate 11) (see FIG. 3B). As a result, since the distance from the coil 31 to the joint portion is reduced, brazing can be performed with less electric power.

In this respect, for example, if the coil 31 is arranged outside the outer peripheral surface of the mouthpiece 17, the portion other than the joint portion is excessively heated, and the surface of the connection portion 13 may be burned, or the outer peripheral surface of the mouthpiece 17 ( There is a possibility that deformation may occur in the screw part). In other words, the joint between the mouthpiece 17 and the connection part 13 is a concave surface when viewed from the outside of the container. (near the open end 23) is closer to the coil 31 than the joint portion, there is a risk that portions other than the joint portion will be excessively heated. In addition, heat may be dissipated to the outside atmosphere, resulting in poor heating efficiency. Conversely, when the joint is viewed from the inside of the container, especially from directly below the open end 23, the joint has a convex surface projecting obliquely downward. The inventors paid attention to this fact and decided to arrange the coil 31 slightly below the inner surface of the joint.

The size and number of turns of the coil 31 may be determined according to the fire extinguisher 1 to be manufactured, particularly the size and material of the mouthpiece 17, the heating amount, the heating efficiency, and the like. At least, the outer diameter of the coil 31 is smaller than the inner diameter of the base 17 . Further, in order to heat a desired portion more efficiently, ferrite may be provided around the coil 31 to concentrate the magnetic flux 33 near the joint.

Then, when the coil 31 is energized, a magnetic flux 33 is generated that penetrates the coil 31 as shown in FIG. 3B, and the portion corresponding to the area A in FIG. When the temperature of the region A exceeds the melting point of the brazing filler metal 29, the brazing filler metal 29 melts, flows into the gap between the opening end 23 and the base 17, fills the groove 27, and joins the connecting portion 13 and the base 17 together. .

To give a specific example of electromagnetic induction heating, assume that the base and the connecting part are made of iron, the inner diameter of the base is 34 mm, the width of the groove is 2 mm, the depth is 2 mm, and the diameter of the open end 23 is 39 mm. As a brazing material, silver brazing containing 45% silver, 30% Cu, and 25% Zn is used.
At this time, the coil is designed to have a diameter of 6.5 to 9.5 mm, a winding inner diameter of 40 to 55 mm, the number of turns of 1, and a resonance frequency of 60 kHz, and is placed 3 to 10 mm below the open end.
In this state, the coil is energized at 3 kW for 13 seconds, then allowed to stand still for 10 seconds, and then energized at 2 kW for 10 seconds again to melt the brazing material and braze the base and the connecting portion.

After that, the body plate 11 and the connecting portion 13, and the body plate 11 and the lower end plate 15 are joined by a joining method such as welding or electromagnetic induction heating to obtain the metal container 2. The fire extinguisher 1 is completed by filling the metal container 2 with the extinguishing agent 3 and attaching the valve 4, the lever 5, the hose 6 and the siphon pipe 7.

According to this manufacturing method, the ring-shaped brazing filler metal 29 is fitted into the groove 27 of the mouthpiece 17, and electromagnetic induction heating is performed by the coil 31 from the inner side of the joint in the circumferential direction and slightly below the joint, thereby forming the joint and the joint. The vicinity thereof can be efficiently heated. This can prevent problems caused by heating unnecessary portions.

In addition, in the fire extinguisher 1 manufactured in this way, the mechanical strength of the brazed joint is high, and the airtightness, impact resistance, and vibration resistance are excellent. That is, the strength and pressure resistance performance of the container 1 are improved.
Also, in welding, as the diameter of the container increases, the length of the part to be joined increases, so the welding time also increases. there is no problem.
Furthermore, in brazing by electromagnetic induction heating, there is no overlapping of joints unlike welding, so the appearance of the metal container 2 is improved.

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,
2... metal container,
3... extinguishing agent,
4 valve,
11... body plate,
13 ... connection part,
17... base,
27 grooves,
29: Brazing material.

Claims (4)

A fire extinguisher comprising a cylindrical metal container, a fire extinguishing agent contained in the metal container, and a valve for ejecting the fire extinguishing agent to the outside of the metal container,
The metal container is
a tubular body plate at an upper end having a first diameter;
a connecting portion connected to the upper end of the body plate and having an open end with a second diameter smaller than the first diameter;
a cylindrical mouthpiece provided at the open end and having a groove along the end surface facing the upper surface of the open end;
a brazing material that fills the gap between the opening end and the mouthpiece and the groove;
including
A fire extinguisher characterized by: the groove is annular;
The fire extinguisher according to claim 1, characterized by: A method for manufacturing a fire extinguisher comprising a cylindrical metal container, a fire extinguishing agent contained in the metal container, and a valve for ejecting the fire extinguishing agent to the outside of the metal container,
As members of the metal container, a cylindrical body plate having a first diameter, a connecting portion having an open end having a second diameter smaller than the first diameter, and facing the upper surface of the open end. Prepare a cylindrical mouthpiece having a groove along the end face that becomes, and a brazing material having a shape corresponding to the groove,
placing the base on the open end with the brazing material fitted in the groove;
Arranging the coil inside the open end,
A method for manufacturing a fire extinguisher, comprising: energizing the coil, melting the brazing material by electromagnetic induction heating of the connecting portion and the base, and joining the connecting portion and the base. preparing a die having an annular groove as the die and an annular brazing material as the brazing material;
The method for manufacturing a fire extinguisher according to claim 3, characterized by:

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