JP2009195596A - Highly expansible foam fire-extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the reduction of foaming magnification under a smoke situation in highly expansible foam fire-extinguishing equipment. <P>SOLUTION: The highly expansible foam fire-extinguishing equipment includes a foaming machine body 3 formed into a cylindrical shape, the foaming net 5 provided on the leading end side of the foaming machine body, and the discharge nozzle provided on the rear end side in the foaming machine body to discharge a foam aqueous solution (w) toward the foaming net, wherein a flow velocity resistor 7 for reducing the flow velocity of the foam aqueous solution flowing toward the foaming net along the inner wall surface 3f of the foaming machine body is provided to the inner wall surface of the foaming machine body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-expansion foam fire extinguishing equipment used in a pit of an oil tank, a culvert of an oil complex, a cabin, a hold or the like.

  In the foam fire extinguishing equipment, the foam aqueous solution is discharged from the radiation nozzle, is blown by colliding with the foaming net and sucked in air, and the fire source is filled with the foam to extinguish the suffocation. Here, the foaming ratio indicating the volume ratio of the foam aqueous solution and the generated foam is 80 or more and less than 1000 is referred to as high expansion foam fire extinguishing equipment.

  In order to generate highly expanded bubbles, for example, bubbles with an expansion ratio of 500 or more, it is necessary to take in a large amount of air from the upstream side of the radiation nozzle. When a large amount of air is taken in, a method of sucking outdoor air (Referred to as “outside air”).

  However, in this outside air, since outside air is used, a duct is provided in the building, or a bubble generator (foaming machine) is provided by making a hole in the partition wall, which increases costs. There is a problem.

  Therefore, in order to solve the above problem, a high expansion foam fire extinguishing equipment of a system (referred to as “inside air”) that sucks air in a compartment from which bubbles are discharged is used (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 06-165837

  In the inside air high expansion foam fire extinguishing equipment, the foaming ratio is remarkably reduced as compared with the outside air high expansion foam fire extinguishing equipment. The main cause is “smoke” generated in the room due to the occurrence of a fire. The smoke floats in the room as solid fine particles, for example, fine particles having a particle diameter of 1 μm or less. When the fine particles are mixed with the air in the radiation section and sucked into the air suction portion of the foam generator, the fine particles are supplied together with the air to the foaming portion to reduce the foaming ratio.

  The present inventor has found that it is only necessary to remove the smoke particles in order to solve the above problem, but it is thought that the reduction in the expansion ratio can be prevented without removing the smoke particles. It was.

  In general, a foam such as a high expansion foam is a two-layer film of a surfactant contained in a foam stock solution, and is composed of an inner thin film and an outer thin film that sandwich a hydrophilic region. While being formed, it is said that it encloses air and enters a bubble state. And, the present inventor said that the foaming ratio is not good when foreign matters such as smoke particles are present, when the radiating nozzle is operated with the standard setting, the droplet speed of the foam aqueous solution from the radiating nozzle is too high. Thus, it was considered that the formation of the two thin films could not catch up and the two thin films could not be formed side by side and would pass through the mesh of the foaming net.

As a solution to the above problem, it is conceivable that the radiation pressure is made smaller than the standard setting and the ejection speed of the radiation nozzle is lowered to make it difficult for the droplets of the aqueous foam solution to pass through the mesh.
Therefore, when the foaming state of the aqueous foam solution having a predetermined concentration was changed by changing the radiation pressure of the radiation nozzle, the injection pressure was 0.5 Mpa. At 0.2 MPa, the pressure decreased only to about 4/5.

  In this way, when the radiation pressure of the aqueous foam solution is reduced, foaming is likely to occur, but the amount of air suction and the amount of aqueous radiation bubble solution are smaller than the standard settings. For this reason, the foaming amount is reduced, and a desired foaming amount cannot be obtained within a predetermined time.

  In view of the above circumstances, an object of the present invention is to prevent a reduction in the expansion ratio under a smoke situation.

The present invention includes a foaming machine main body formed in a cylindrical shape, a foaming net provided on a front end side of the foaming machine main body, a rear end side inside the foaming machine main body, and facing the foaming net. A high-expansion foam fire extinguishing equipment comprising a radiating nozzle for radiating a foam aqueous solution;
The foaming machine main body is provided with a flow velocity resistor for reducing the flow velocity of the aqueous foam solution flowing toward the foaming net along the inner wall surface.

  The flow velocity resistor according to the present invention includes a cylindrical body similar to the foaming machine main body, and the outer diameter of the cylindrical body is formed to be substantially the same as the inner diameter of the foaming machine main body. And The flow velocity resistor according to the present invention is provided on the foaming net side from the radiation nozzle. The flow velocity resistor according to the present invention is constituted by a punching metal, an upright plate with a single hole, or a filed surface plate.

  In this invention, since the flow velocity resistor for reducing the flow velocity of the foam aqueous solution that flows toward the foaming mesh side along the inner wall surface is provided on the inner wall surface of the foaming machine main body, the foam aqueous solution injected from the radiation nozzle A part of is directed to the foam net while contacting the flow velocity resistor. Therefore, since the foam aqueous solution is decelerated and collides with the foaming net, it is possible to prevent the foaming ratio from being reduced. In addition, since a normal amount of the foam aqueous solution is ejected from the radiation nozzle, the amount of air sucked into the foaming machine body and the amount of foaming can be sufficiently obtained.

  The present inventor has found that most of the foam aqueous solution ejected from the radiation nozzle directly collides with the foaming net, but a part thereof, that is, away from the central axis of the radiation nozzle and radiates outward. The foam aqueous solution first collides with the inner wall surface of the foaming machine main body. This is because, although depending on the radiation angle of the radiation nozzle, the distance between the radiation nozzle and the foaming net is, for example, 90 cm apart.

  The foam aqueous solution that hits the inner wall surface of the foaming machine main body flows toward the foaming net while being guided by the inner wall surface. However, since the inner wall surface is a smooth surface formed of a metal plate or the like, there is little friction. Therefore, the flow of the foam aqueous solution flowing down while being guided by the inner wall surface is not decelerated. In this way, when the foam aqueous solution collides with the foaming net while the flow rate of the foam aqueous solution is high, bubbles are not easily formed under the smoke condition as described above.

  Therefore, in the present invention, a flow velocity resistor is provided on the inner wall surface in order to reduce the flow velocity of the aqueous foam solution. This flow velocity resistor has a hole or a standing piece, but the frictional resistance against the flowing aqueous foam solution is increased by the hole or the standing piece, and the aqueous foam solution flows along the inner wall surface. The radiant energy is taken away, and the flow velocity is reduced until it hits the foaming net.

In this way, a part of the foam aqueous solution radiated from the radiation nozzle is collided with the foaming net after being decelerated by the flow velocity resistor, so that a reduction in the foaming ratio can be prevented.
The flow velocity resistor may be attached to the inner wall surface by attaching a plate material (either resin or metal) constituting the flow velocity resistor with bolts and nuts, or pasted on the inner wall surface with an adhesive or the like. May be.

A first embodiment of the present invention will be described with reference to FIGS.
A foaming machine 1 of a high expansion foam fire extinguishing equipment is provided in a room (chamber) which is a foam discharge section. In the foaming machine 1, for example, the foaming ratio is set to 500.

  The foaming machine 1 includes a foaming machine main body 3 having a cylindrical shape, for example, a square cross section, and a foaming net 5 is provided on the tip 3 a side of the foaming machine main body 3. A radiation nozzle 6 is built in the rear end 3b side of the foaming machine main body 3. The radiation nozzle 6 is separated from the foaming net 5 by a predetermined distance L, for example, 90 cm. A flow velocity resistor 7 is provided on the inner wall surface 3 f of the foaming machine body 3.

  Here, the flow velocity resistor 7 is means for reducing the flow velocity of the foam aqueous solution flowing toward the foaming net along the inner wall surface 3f of the foaming machine main body 3. The flow velocity resistor 7 is formed of, for example, punching metal, and is provided on the foaming net 5 side from the radiation nozzle 6 of the foaming machine body 3. This is because the foam aqueous solution is radiated in a conical shape from the radiation nozzle 6, and in the foamer main body 3, the foam aqueous solution does not hit the inner wall surface 3 f on the radiation nozzle 6 side. That is.

  As shown in FIG. 2, this punching metal is a rectangular metal plate having a thickness H, a short side length Ly, and a long side length Lx, and a plurality of resistance holes 7a are formed. Has been. The length Lx of the long side is formed to be a length L / 2 (for example, 45 cm) which is a half of the distance L between the foaming net 5 and the radiation nozzle 6, but the thickness H of the flow velocity resistor, The lengths Ly and Lx, the number of resistance holes 7a, the drilling positions, and the like are appropriately selected as necessary.

  The punching metal 7 is fixed to the inner wall surface 3f of the foaming machine main body 3 one by one and becomes a flow velocity resistor having a square cross section (tubular shape), but the punching metal is previously formed into a cylindrical flow velocity resistor. The flow velocity resistor may be fitted to the foaming machine main body 3 to cover the inner wall surface 3f of the foaming machine main body 3. In this case, the cylindrical flow velocity resistor is formed in a rectangular shape similar to the cross section of the inner wall surface 3f of the foaming machine main body 3, and the outer diameter thereof is formed to be approximately the same as the inner diameter of the foaming machine main body 3. Is done.

Next, the operation of this embodiment will be described.
When a fire occurs in the room, a fire detector (not shown) detects the fire and sends a fire signal to the control panel. Then, since the control panel activates the high expansion foam fire extinguishing equipment, the room air, that is, the air A in the vicinity of the room where the foaming machine 1 is disposed is sucked into the foaming machine main body 3. The foam aqueous solution w is discharged as droplets from the radiation nozzle 6.

  The aqueous foam solution w discharged from the radiation nozzle 6 is discharged in a conical shape, and the droplets outside thereof collide with the flow velocity resistor 7 and a part of the flow direction is changed. It proceeds toward the foaming net 5 while being guided by, and collides with the foaming net 5 and foams.

  At this time, since the foam aqueous solution w travels while receiving resistance through the resistance hole 7a, the flow velocity is gradually reduced and collides with the foaming net 5 in a state where the radiant energy is reduced. Therefore, the reduction in the expansion ratio can be reduced.

A second embodiment of the present invention will be described with reference to FIG. 5. The same reference numerals as those in FIGS. 1 to 4 have the same names and functions.
The difference between this embodiment and the first embodiment is that, as a flow velocity resistor, an upright piece perforated plate 17 is used instead of the punching metal.

Here, the standing single hole perforated plate 17 refers to a plate in which a plurality of standing pieces 17a are cut and raised from a flat plate body like a grater to open the resistance holes 17b. The number, width, The standing angle and the like are appropriately selected in consideration of the magnitude of the flow velocity resistance.
When this standing hole plate 17 is used, the foam aqueous solution collides with the standing piece 17a and progresses while changing the flow direction, and proceeds while receiving the resistance of the resistance hole 17b, so that the flow velocity is greatly reduced. Collides with foaming net in state.

A third embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals as those in FIGS. 1 to 4 have the same names and functions.
The difference between this embodiment and the first embodiment is that a file plate 27 is used as a flow velocity resistor instead of using a punching metal.

  Here, the file-like plate 27 is a material having a rough surface 27a (unevenness) and a high friction coefficient, such as a cloth file. The degree of unevenness on the surface 27a is appropriately selected in consideration of frictional resistance.

It is a longitudinal cross-sectional view which shows 1st Example of this invention. It is a perspective view of a flow velocity resistor. It is the II-II sectional view taken on the line of FIG. It is a principal part enlarged view of FIG. It is a figure which shows 2nd Example of this invention, and is an expanded longitudinal cross-sectional view of a flow-speed resistor. It is a figure which shows 3rd Example of this invention, and is an expanded longitudinal cross-sectional view of a flow-speed resistor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foaming machine 3 Foaming machine main body 5 Foaming net 6 Radiation nozzle 7 Flow velocity resistor w Foam aqueous solution

Claims (4)

A foaming machine main body formed in a cylindrical shape, a foaming net provided on the leading end side of the foaming machine main body, provided on a rear end side inside the foaming machine main body, and an aqueous foam solution toward the foaming net A high expansion foam fire extinguishing system comprising a radiating nozzle;
A high-expansion foam fire extinguishing system, characterized in that a flow velocity resistor is provided on the inner wall surface of the foaming machine main body to reduce the flow velocity of the foam aqueous solution flowing toward the foaming net along the inner wall surface.   The high-expansion foam fire-extinguishing equipment according to claim 1, wherein the flow velocity resistor is provided on the foaming net side from the radiation nozzle.   The flow velocity resistor is constituted by a cylindrical body similar to the foaming machine main body, and the outer diameter of the cylindrical body is formed to be approximately the same as the inner diameter of the foaming machine main body. Item 3. The high expansion foam fire extinguishing equipment according to Item 1 or 2.   The high-expansion foam fire extinguishing equipment according to any one of claims 1 to 3, wherein the flow velocity resistor is formed of a punching metal, a stand-up piece perforated plate, or a filed surface plate.

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