JPH11137708A - Fire foam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable fire extinguishing device which is prepared with a discharge tube and is of middle foaming (foam magnifying power 50 to 150). SOLUTION: An extinguishing fluid of a hollow cone shape is spurted from a nozzle part 5 set in the center of a discharge tube 31, and foam magnifying power of the discharged foam fluid is set for 50 to 150, then it is collided against the outer edge of a foaming net 34 provided in front of the discharge tube 31. The nozzle part 5 is constituted so that a spiral member 54 having a spiral groove on the peripheral surface of a columnar body is fitted into an outer tube 51, thus the extinguishing fluid flows spirally within the nozzle part 5 by the groove, and is spurted in the hollow cone shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam fire extinguisher equipped with a portable water discharge pipe.

[0002]

2. Description of the Related Art In general, fire extinguishers and fire extinguishers using fire extinguishing foam, liquids, or powders are known. Among them, a foam fire extinguisher using a fire extinguishing foam is effective for fires involving oil combustion and liquid level fires. In a foam fire extinguisher in which a water discharge tube is movable, that is, portable, generally, a low foaming fire extinguishing foam having a low foaming ratio of, for example, about 5 to 20 is used.

As such a portable foam fire extinguishing apparatus, there is a fire extinguishing foam generating apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 58-10762. As shown in FIG. 12, the fire-extinguishing foam generator 1 has a porous body 11 such as a honeycomb structure that generates and emits foam, and a liquid ejection nozzle 12 is disposed behind the porous body 11 and air is blown. Fan 13 as a means
Is provided.

[0004] The foaming ratio of the fire extinguishing foam is 80 to 1000.
Fire extinguishing systems with higher foaming are also known ("Gentle fire extinguishing equipment (4) Foam extinguishing equipment", air conditioning and sanitary engineering,
Vol. 71, No. 1, pp. 51-62, 1997, 1
Moon).

[0005] The expansion ratio is defined as the volume of the aqueous foam solution as V1, and air is mixed therein, as described in the left column on page 52 of the above-mentioned document "Easy fire extinguishing equipment (4) Foam extinguishing equipment". V2 assuming the volume of foam generated by foaming as V2
/ V1.

[0006]

However, in a low-foaming fire extinguisher with an expansion ratio of 5 to 20, the apparent specific gravity of the fire-extinguishing foam is large, so that the flight distance is, for example, 8 m or more, which is effective for extinguishing a distant fire. However, when it collides with an object, the rebound force is large, and it scatters in all directions.
For this reason, for example, if there is an object such as a machine tool between a fire point, that is, a fire extinguishing target area and a water discharge pipe of a fire extinguisher in a factory or a warehouse, the released fire extinguishing foam is blocked by the object, and beyond that, The amount of reaching a certain fire point is small, and as a result it is forced to move around left and right, back and forth, changing the inclination and height of the water discharge tube in confusion, making it difficult to extinguish fires, and extinguishing fires in some places It can be difficult. Further, in the case of a liquid level fire, the liquid may be splashed off by the force of the fire extinguishing foam that has reached the liquid level, which may lead to fire spread.

On the other hand, in a fire extinguisher with high foaming, the volume of the fire extinguishing foam is large and the apparent specific gravity is small, so that LNG, LPG
Although it is effective for large space objects such as inside a dike, it hardly flies forward, so it is not suitable for extinguishing a fire extinguishing liquid from a position slightly away from a small fire extinguishing point.

Therefore, it is conceivable to increase the expansion ratio of the fire-extinguishing foam based on the fire-extinguishing foam generator disclosed in Japanese Utility Model Application Laid-Open No. 58-10762. The cone shape of the fire extinguishing liquid spouted from the nozzle 12 is substantially uniform from the outer peripheral surface region to the central region and is filled with the fire extinguishing liquid (hereinafter, this cone). Since the shape is referred to as a full cone (full cone) shape, bubbles are generated in the foaming net, but the amount of liquid passing therethrough is large, and as a result, the foaming ratio is high, such as foaming. It is virtually impossible to produce a fire-fighting foam that is in use. In FIG. 12, the fire extinguishing liquid part having a full cone shape is shown as a set of points.

The present invention has been made under such circumstances, and it is an object of the present invention to provide a medium-foaming (foaming ratio of 50 to 150) fire extinguisher equipped with a portable water discharge tube. .

[0010]

According to the present invention, there is provided a water discharge tube having a front surface forming a water outlet, a portable water discharge tube, a nozzle portion provided at a position rearward of the front surface of the water discharge tube and at a central portion thereof, Formed at a position rearward of the nozzle portion, and a vent for air to be drawn into the water discharge cylinder when the fire extinguishing liquid is discharged from the nozzle portion, and provided to close the water discharge tube at a position forward of the nozzle portion. A foam net portion for foaming the fire extinguishing solution from the nozzle portion, and when viewed in the radial direction of the water discharge tube, the flow rate of the fire extinguishing solution in the peripheral region of the foam net portion is the central portion. The fire extinguishing liquid is discharged from the nozzle portion toward the foaming net portion so as to be larger than the flow rate, and the foaming ratio of the discharged foaming liquid is 50 to 150.
It is characterized by being.

Further, the fire extinguishing liquid is discharged in a cone shape in which the fire extinguishing liquid is concentrated on the periphery so that the fire extinguishing liquid spreads further from the nozzle toward the front, and the tip of the cone-shaped fire extinguishing liquid is formed at the outer edge of the foamed net portion. It is designed to collide with.

[0012]

1 and 2 show an example of a foam fire extinguisher according to the present invention and a fire extinguishing facility using the same, respectively. As shown in FIG. 2, the fire extinguishing equipment has a pressurizing gas container 24 connected to a fire extinguishing liquid container 21 via a regulator 22 and a container valve 23, and has a hose 25 connected to the fire extinguishing liquid container 21. The configuration is such that the foam fire extinguisher 3 is connected via the valve 26. The container valve 23 may be opened in advance, but may be manually opened in the event of a fire or may be linked to a sensor. Further, the container valve 23 may have a pressure adjusting function, or may be used together with a pressure adjusting valve. The fire extinguishing liquid container 21 and the pressurizing gas container 24 are housed in a space inside the wall surface 4 of the building, for example, and are fixed, and the foam fire extinguisher 3 is portable.

As shown in FIG. 1, the foam fire extinguishing device 3 includes a water discharge tube 31 having a cylindrical shape with both ends opened, a nozzle portion 5 for injecting a fire extinguishing liquid into the water discharge tube 31, and a nozzle portion 5. And a foaming net portion 34 for foaming the jetted fire extinguishing liquid (indicated by a broken line A in FIG. 1).

A front end of the water discharge tube 31 serves as a water discharge port 32, and is closed by a foam net portion 34. Water discharge tube 31
The rear end is opened as a vent 33. The vent 33 is provided to draw air into the water discharge tube 31 when the fire extinguishing liquid is discharged from the nozzle portion 5.

The foamed net portion 34 is formed, for example, in an umbrella shape such that its center protrudes forward (to the right in FIG. 1) in the water discharge direction. The angle θ between the peripheral edge of the foamed net portion 34 and the inner peripheral surface of the water discharge tube 31 is not particularly limited, but is set to, for example, 60 °. Since the foam net portion 34 is inclined at such an angle, even if the opening ratio of the foam net portion 34 is, for example, 50%, the total opening area corresponds to 100% of the cross-sectional area of the discharge cylinder. .

The nozzle portion 5 is provided behind the foamed net portion 34 and at the center of the water discharge tube 31 by being fixed to the water discharge tube 31 by, for example, support means (not shown).
The nozzle part 5 includes an outer cylinder 51, a spiral member 53 fitted into the outer cylinder 51, and a guide cylinder 5 fitted externally to the outer cylinder 51.
0. The guide cylinder 50 has a plurality of air inlets 50a which are enlarged in diameter toward the front and extend in the circumferential direction.
Are formed.

The front end of the outer cylinder 51 is opened as a fire extinguishing liquid outlet 52. The rear end of the outer cylinder 51 is connected to a pipe 37 which is open and serves as a joint. This pipe 3
7 is connected to the opening / closing valve 26 (see FIG. 2) provided at a connection portion with the hose 25.

As shown in FIG. 3, the spiral member 53 is formed by forming a spiral groove 54 on the outer peripheral surface of a cylindrical body. The fire-extinguishing liquid sent from the fire-extinguishing liquid container 21 via the hose 25 or the like passes through a spiral flow path formed by the groove 54 of the spiral member 53 and the inner peripheral surface of the outer cylinder 51, 51 is ejected forward from the ejection port 52. At that time, the fire extinguishing liquid that has been jetted is subjected to rotation about the direction in which the fire proceeds. As a result, as shown in FIG. 4, the shape of the jet of the fire extinguishing liquid 6 is such that the fire extinguishing liquid 6 is concentrated only in the outer peripheral surface area of the cone shape and has little or no concentration in the central area of the cone shape (hereinafter referred to as a hollow cone shape). This cone shape is referred to as a hollow cone (hollow cone) shape. The distribution when this hollow cone-shaped fire extinguishing liquid collides with the foamed net portion 34 is as follows:
It is also shown in front of the water discharge tube 31 of FIG.

The fire-extinguishing liquid 6 having a hollow cone shape and ejected from the nozzle portion 5 collides with the outer edge of the foamed net portion 34. That is, the front end of the hollow cone shape reaches the foamed net portion 34 near point B shown in FIG. This is because the hollow cone fire extinguishing liquid 6 liquefies when hitting the inner peripheral surface of the water discharge tube 31 before the outer edge of the foamed net portion 34, and cannot be efficiently foamed.

The number of the grooves 54 of the spiral member 53, the grooves 54
The number of turns, the depth and the width of the groove 54 are appropriately selected so that a desired expansion ratio is obtained, and the fire extinguishing liquid 6 has a hollow cone shape and collides with the outer edge of the foamed net portion 34.

As the fire extinguishing liquid, for example, a foam aqueous solution obtained by diluting a base composed of a solution obtained by hydrolyzing a natural protein or a base composed of a synthetic surfactant with water is used.

When the foam fire extinguishing apparatus 3 and the fire extinguishing equipment configured as described above are used, the fire extinguishing liquid is ejected from the nozzle portion 5 into a hollow cone shape, which hits the foamed net portion 34 and passes through the vent 33 of the water discharge tube 31. Although bubbles are formed by the sucked air, the amount of the bubbles increases with a small amount, so that the fire-extinguishing foam of medium foaming having a foaming ratio of 50 to 150 is discharged from the water discharge port 32.

When the present inventors produced the foam fire extinguisher 3 having the above-described structure and discharged water, it was possible to obtain a fire extinguishing foam of medium foaming having an expansion ratio of 50 to 150. Specifically, the pressure of the gas pressurized in the fire-extinguishing liquid container 21 is set to, for example, 5 to 7K.
g / cm ² , the inner diameter of the water discharge tube 31 is 80 mm, and the distance from the tip of the water discharge tube 31 to the tip of the nozzle 5 is 22.
0 mm. The flight distance (horizontal distance from the tip of the water discharge tube 31 to the center in the front-rear direction of the foot step <fall area>) when the water discharge tube 31 was held by hand and set at an inclination angle of 30 ° was 4 m to 8 m.

When the foaming ratio is 50 to 150, the flying mass becomes as a lump of foam, so as to climb over the object while sliding on the surface of the object, and goes to the ignition point while wrapping around, while securing an appropriate flight distance. In addition to exhibiting excellent fire extinguishing ability even in a place where an object such as a workpiece is stuck, an effective fire extinguishing operation can be performed even in a liquid level fire without flipping the liquid level.

FIG. 5A shows a state in which the fire-extinguishing foam 7 released from the foam fire-extinguishing device 3 is discharged toward a square-shaped object. Hardly bounced over the object 18 and reached the other side. FIG. 5 (b) is a diagram showing a state in which a similar experiment was conducted with the foaming ratio set to about 20, and in this case, the fire extinguishing foam 17 released from the water discharge tube 16 was almost rebounded by the object 18. I have.

As shown in FIG. 6, the distribution of the fire extinguishing liquid ejected from the nozzle portion 5 when the fire extinguishing liquid collides with the foamed net portion 34 is the largest at the outer edge of the foamed net portion 34, and in the inner region thereof. It may have a gradient that decreases. In this case, a water hole 55 is formed in the center of the spiral member 53, and the groove 54 is deeper than that in FIG. Further, the water discharge tube 31 may be a rectangular tube, a blower for forcibly introducing air into the water discharge tube 31 may be provided, or a flat net may be used for the foamed net portion 34.

In the above description, the fire extinguishing liquid container 21 and the pressurizing container 24 are fixed in the above-described example. However, the fire extinguishing liquid container 21 and the pressurizing container 24 may be mounted on a portable table so as to be movable or move by themselves. Good. The pressurizing container 24
May be stored in the fire extinguishing liquid container itself in advance without using a water container and a foam raw liquid container, and the liquids in these containers may be mixed and sent to the nozzle unit 5, Alternatively, instead of being configured as a unit type, a facility using a water tank, a pump, a foam concentrate tank, and a mixer may be used.

Further, as shown in FIG.
May be configured by combining nets having different aperture ratios, and by rotating the nets to selectively place them in front of the nozzle portion 9, fire-extinguishing foam of medium foaming and low foaming may be discharged. Note that FIG. 7 shows the difference in the aperture ratio depending on the size of the saw blade shape of the foaming net portion 81. Also, by changing the distance between the nozzle portion 9 and the foamed net portion 82 as shown in FIG. 8, medium and low foaming fire extinguishing foam may be discharged, or as shown in FIG. For example, by changing the distance between the two foamed net portions 83 and 84, the fire extinguishing foam of medium foaming and low foaming may be discharged. Alternatively, as shown in FIG. The foaming net portion 86 of FIG. 11 may be attached and detached, and the number of foaming net portions may be changed to discharge medium- and low-foaming fire extinguishing foam.
As shown in the figure, the combination of the shape of the foaming net portion 87 and the water discharge pattern of the nozzle 9 (in this case, the nozzle portion 9 is a variable spray nozzle) discharges medium- and low-foaming fire extinguishing foam. It may be.

It should be noted that the foamed net portion in the present invention does not mean only a net-like material such as a wire mesh, but a porous material such as a honeycomb material or a punched metal which is foamed.

[0030]

As described above, according to the present invention, there is provided a fire extinguisher which is portable and can discharge medium-foamed fire extinguishing foam having an expansion ratio of 50 to 150. Therefore, even if a machine tool or the like is installed in a factory or the like, a fire on the other side of the machine tool or the like can be efficiently extinguished. Also, in the event of a liquid level fire, the fire extinguishing foam that has been discharged covers the liquid level, which is extremely effective in extinguishing the fire.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a foam fire extinguisher according to the present invention together with an example of a fire extinguishing liquid distribution.

FIG. 2 is a schematic diagram showing an example of fire extinguishing equipment using the foam fire extinguisher.

FIG. 3 is a perspective view of a spiral member of the foam fire extinguisher.

FIG. 4 is a schematic diagram showing a shape of a fire extinguishing liquid jetted from the nozzle portion.

FIG. 5 is a schematic diagram showing a state of fire extinguishing by the foam extinguisher according to the present invention and a comparative example.

FIG. 6 is a longitudinal sectional view showing another example of the distribution of the fire extinguishing liquid together with the longitudinal section of the foam fire extinguisher.

FIG. 7 is a schematic diagram showing a first example of a foam fire extinguisher compatible with both low foaming and medium foaming.

FIG. 8 is a schematic diagram showing a second example of a foam fire extinguishing device that supports both low foaming and medium foaming.

FIG. 9 is a schematic diagram showing a third example of a foam fire extinguishing device that supports both low foaming and medium foaming.

FIG. 10 is a schematic diagram showing a fourth example of a foam fire extinguishing device that supports both low foaming and medium foaming.

FIG. 11 is a schematic diagram showing a fifth example of a foam fire extinguishing device that supports both low foaming and medium foaming.

FIG. 12 is a longitudinal sectional view showing a fire extinguisher for low foaming.

[Explanation of symbols]

 5 Nozzle part 6 Fire extinguishing liquid 31 Water discharge pipe 32 Water discharge port 33 Vent port 34 Foam net part

Claims (2)

[Claims] 1. A water discharge tube having a front surface forming a water discharge port, a portable water discharge tube, a nozzle portion provided at a position rearward of the front surface of the water discharge tube and at a central portion, and formed at a position rearward of the nozzle portion. A vent for allowing air to be drawn into the water discharge tube when the fire extinguishing liquid is discharged from the nozzle portion; and a fire extinguisher from the nozzle portion provided so as to close the water discharge tube at a position forward of the nozzle portion. And a foam net portion for foaming the liquid, so that the flow rate of the fire extinguishing liquid in the region of the peripheral portion of the foam net portion when viewed in the radial direction of the water discharge tube is larger than the flow rate in the central portion, The fire extinguishing solution is discharged from the nozzle portion toward the foaming net portion, and the foaming ratio of the foaming solution discharged is 50 to 50.
150. A foam fire extinguisher characterized by being 150. 2. The fire extinguishing liquid is discharged in a cone shape in which the fire extinguishing liquid is concentrated on the peripheral edge so that the fire extinguishing liquid spreads further toward the front from the nozzle portion. The foam fire extinguisher according to claim 1, wherein the foam is extinguished.