JP4808601B2 - High expansion foam fire extinguishing equipment - Google Patents

Description

  The present invention relates to a high-expansion foam fire extinguishing equipment and a foaming method thereof used in oil tank pits, oil complex culverts, cabins, holdhouses, and the like. The present invention relates to an expanded foam fire extinguishing facility.

  In the foam fire extinguishing equipment, the foam aqueous solution is discharged from the radiation nozzle, blown into the foaming net and blown in by sucking air, and the fire source is filled with the foam to extinguish the suffocation. The foam fire extinguishing equipment includes a low foaming fire extinguishing equipment and a high foaming (high expansion foam) fire extinguishing equipment.

  In both the fire extinguishing equipments, the foaming ratio is different, for example, the foaming ratio of the low foaming fire extinguishing equipment is 20 or less, and the foaming ratio of the high expansion foam fire extinguishing equipment is 80 or more and less than 1000. Here, the expansion ratio refers to the volume ratio between the aqueous foam solution and the generated foam.

  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. The method (called “outside air”) is generally used.

  However, in this outside air, since outside air is used, a duct is penetrated in the building, or a bubble generator is provided by making a hole in the partition wall. .

  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 that discharges bubbles is used (for example, refer to Patent Document 1).

JP-A-6-165837

  In the high expansion foam fire extinguishing equipment of inside air, the foaming ratio may not be as designed depending on the quantity and quality of smoke generated at the time of fire. For example, when the designed foaming ratio is 500, the actual foaming ratio is 100. When the expansion ratio is reduced in this manner, it is impossible to completely cover the fire source with the bubbles, so that the suffocation can not be effectively performed. The reason why the expansion ratio is lowered will be described in detail later, but it is mainly the presence of smoke in the air.

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

The present invention is a high-expansion foam fire extinguishing equipment that sucks air in a discharge section into a foaming section and causes the aqueous solution discharged from the radiation nozzle to collide with the foaming net and foam; upstream of the foaming net, A flow rate regulating network formed similar to the foamed net is provided adjacent to the foamed net .

The present invention is a high-expansion foam fire extinguishing equipment that sucks air in a discharge section into a foaming section and causes an aqueous solution discharged from a radiation nozzle to foam against a foam board having foam holes; , the side that faces the radiation nozzles, the the periphery of the foam pores, and wherein the speed reduction foaming plate der Rukoto provided with flow rate regulating means for regulating the entry of said foam solution.

The flow rate restricting means of the present invention is a cylindrical projection surrounding the foam hole .

The flow rate restricting means according to the present invention is provided at an edge of the foam hole, and is a triangular projection.

The said flow rate regulating means of the present invention, the cutting and raising the foam hole, and wherein the opening limiting inclined piece der Rukoto formed by bending.

  Since this invention was comprised as mentioned above, the foam aqueous solution injected from the radiation nozzle is inserted into the mesh of a foaming net | network or the foaming hole of a foaming board, after being decelerated. Therefore, since it becomes a state in which a foam film is easy to be formed, it is possible to prevent a reduction in foaming ratio.

  The present inventor researched and experimented on the cause of the decrease in the expansion ratio of the high expansion foam fire extinguishing equipment, and found that "smoke" had the main cause. This smoke is generated in the chamber (foam discharge section) due to the occurrence of a fire, but floats in the room as liquid 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 part, they are supplied to the foaming part together with the air, and the foaming ratio is lowered.

  The present inventor has realized that it is only necessary to remove the smoke particles in order to solve the above problem, but it may be possible to prevent the reduction of the expansion ratio without removing it. Thought.

  Generally, a foam such as a highly expanded 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. However, it is said that it will hold air and become a foam. The inventor of the present invention has a low foaming rate when foreign matters such as smoke particles are present. The formation rate of the two thin films is slow, and when the radiation nozzle is operated with a standard setting, the emitted bubbles are reduced. It was thought that this was because the droplet speed of the aqueous solution was so high that the two thin films could not be formed side by side and passed through the mesh.

  As a solution to the above problem, it is conceivable that the ejection pressure of the radiation nozzle is lowered by making the radiation pressure smaller than the standard setting so that the droplets of the foam aqueous solution do not easily pass through the mesh. Therefore, when the foaming state of the foam aqueous solution having a predetermined concentration was changed by changing the spray pressure of the radiation nozzle, the foaming ratio was reduced to 1/5 or less compared to normal when the spray pressure was 0.5 MPa. And at 0.2Mpa, it decreased only to about 4/5.

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

  Therefore, the present inventor intends to solve the above problem by slowing the speed of the droplet of the foam aqueous solution by using a flow rate regulating network or a flow rate regulating means of the foaming plate. The present invention has been made based on the above findings.

An embodiment of the present invention will be described with reference to FIGS.
A room (chamber) 1 which is a foam discharge section is provided with a highly expanded foam fire extinguishing equipment. This fire extinguishing equipment has a foaming ratio of 500, for example, and is provided with a foaming section 3 that sucks air in the discharge section 1.

  The foaming portion 3 is formed in a cylindrical shape, and a foaming net (net) 7 is stretched at the tip, and a plurality of foaming parts 3 are opposed to the foaming net 7 with a gap therebetween. The radiation nozzle 9 is provided. The radiation nozzle 9 is connected to a mixer (not shown) that generates an aqueous foam solution.

  A flow rate regulating network 10 is provided adjacent to the upstream side of the foaming net 7. The mesh size of the flow rate regulating network 10 is formed larger than that of the foaming mesh 7, but the size is appropriately selected as necessary.

  As shown in FIG. 2, the flow rate regulating network 10 is formed in a shape similar to the foaming mesh 7 by bending a single wire mesh into a wave shape. Are appropriately selected. The flow rate regulating network 10 is separated from the foaming network 7 by a gap t, and the size of the gap t is appropriately selected as necessary.

Next, the operation of this embodiment will be described.
When a fire occurs in the room 1, a fire detector (not shown) detects the fire and sends a fire signal to the control panel. Then, the control panel activates the high expansion foam fire extinguishing equipment, so that the indoor air, that is, the air K in the nearby room (discharge section) 1 where the foaming part 3 is disposed is sucked into the foaming part 3. At the same time, the foam aqueous solution (sometimes simply referred to as “aqueous solution”) w is emitted as droplets from the radiation nozzle 9.

  The droplets collide with the flow rate regulating network 10 and decelerate, then collide with the foaming net 7 through the mesh 10a and enter the mesh, but the insertion speed is slower than in the conventional example. Therefore, since it will be in the state which is easy to foam, the water droplet of foam aqueous solution can form the highly expanded foam 12 efficiently.

  Further, another action by the installation of the flow rate regulating network 10 is to cause the droplets to collide twice and foam. Specifically, some of the liquid droplets are foamed by collision with the flow rate regulating network 10, and some liquid droplets that are not foamed collide with the foaming net 7 through the mesh 10 a and foam. As a result, the opportunity for foaming of the droplets increases, and the highly expanded foam 12 can be formed efficiently.

A second embodiment of the present invention will be described with reference to FIGS. 3 to 5. The same reference numerals as those in FIGS. 1 and 2 have the same names and functions.
The difference between this embodiment and the first embodiment is that instead of using a foaming net and a flow rate regulating network, a single deceleration foaming plate having a foaming function and a flow rate regulating function is used.

  The deceleration foaming plate 15 includes a foaming hole 15a having a foaming function, and a cylindrical body 15b provided on a surface (front surface) facing the radiation nozzle 9 and having a flow rate regulating function. A plurality of the foam holes 15a are provided, and the cylindrical body 15b surrounds the foam holes 15a. The size and number of the foam holes 15a, the height of the cylindrical body 15b, and the like are appropriately selected as necessary.

In this embodiment, the foam aqueous solution w ejected from the radiation nozzle 9 becomes droplets and collides with the cylindrical body 15b of the deceleration foaming plate 15, and is decelerated. Thereafter, the air enters the foaming hole 15 a together with the air K, sucks the air K and foams, and becomes a highly expanded foam 12.
Further, the cylinder body 15b is hindered by the liquid droplets dripping around the foaming holes 15a, and the large number of dripping increases the chance of foaming of the liquid droplets, so that the highly expanded foam 12 can be formed efficiently.

A third embodiment of the present invention will be described with reference to FIGS. 6 and 7. The same reference numerals as those in FIGS. 3 to 5 have the same names and functions.
The difference between this embodiment and the second embodiment (FIGS. 3 to 5) is that a triangular protrusion 18b is used instead of the cylinder as the flow rate regulating means. A plurality of the protrusions 18b are provided, and the position of the protrusion 18b is appropriately selected as necessary, and is provided, for example, at the edge of the foam hole 18a.

  The cross section of the protrusion 18b is not necessarily limited to the triangular shape, and may be formed in a trapezoidal shape, a columnar shape, or the like, for example. Further, the height of the protrusion 18 is appropriately selected as necessary.

In this embodiment, the aqueous foam solution w ejected from the radiation nozzle 9 becomes droplets and collides with the protrusions 18b of the deceleration foaming plate 18, and is decelerated. Thereafter, the air enters the foaming hole 18 a together with the air K, sucks the air K and foams, and becomes a highly expanded foam 12.
Further, the protrusion 18b is hindered by the liquid droplets dripping around the foaming hole 18a due to the inhibition, and the dripping of the protrusions 18b increases the chance of foaming of the liquid droplets, so that the highly expanded bubble 12 can be efficiently formed.

A fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same reference numerals as those in FIGS. 3 to 5 have the same names and functions.
The difference between this embodiment and the third embodiment (FIGS. 6 and 7) is that the opening restricting inclined piece 20b is used as the flow velocity restricting means instead of the cylinder. The inclined piece 20b is a portion that is cut and raised when the foam hole 20a is formed, and the inclination angle thereof is appropriately selected as necessary.

  In addition, although the foaming hole 20a is formed in a triangular shape and the opening restricting inclined piece 20b is also formed in a triangular shape, the shape can be appropriately selected as necessary.

In this embodiment, the foam aqueous solution w ejected from the radiation nozzle 9 becomes droplets and collides with the opening regulating inclined piece 20b of the deceleration foaming plate 20, and is decelerated. Thereafter, the air enters the foaming hole 20 a together with the air K, sucks the air K and foams, and becomes a highly expanded foam 12.
Furthermore, the opening restricting inclined piece 20 has a hindrance to the liquid droplets dripping around the foaming hole 20a, and the dripping of the liquid droplets increases the chance of foaming of the liquid droplets. it can.

It is a longitudinal cross-sectional view which shows 1st Example of this invention. It is a top view of a flow rate control network. It is a longitudinal cross-sectional view which shows 2nd Example of this invention. It is a perspective view which shows the board for deceleration foaming. It is the VV sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows the board for deceleration foaming of 3rd Example of this invention. It is the VII-VII sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows the board for deceleration foaming of 4th Example of this invention. It is the IX-IX sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Release section 3 Foaming part 7 Foaming net 9 Radiation nozzle 10 Flow rate regulation network 12 High expansion foam 15 Deceleration foaming board 18 Deceleration foaming board 20 Deceleration foaming board

Claims (5)

A high-expansion foam fire extinguishing facility that sucks air in a discharge section into a foaming section and causes the aqueous solution discharged from the radiation nozzle to collide with a foaming net to foam.
A high-expansion foam fire extinguishing system, characterized in that a flow rate regulating network formed in a similar shape to the foaming mesh is provided adjacent to the upstream side of the foaming mesh . A high-expansion foam fire extinguishing equipment that sucks air in a discharge section into a foaming section and foams the aqueous solution discharged from the radiation nozzle by colliding with a foam plate having foam holes;
The foaming plate, on the side facing the radiation nozzle to the periphery of the foam pores, high, wherein reduction foaming plate der Rukoto provided with flow rate regulating means for regulating the entry of said foam solution Expansion foam fire extinguishing equipment. The high-expansion foam fire extinguishing equipment according to claim 2 , wherein the flow rate regulating means is a cylindrical projection surrounding the foam hole . The high-expansion foam extinguishing equipment according to claim 2 , wherein the flow rate regulating means is a triangular projection provided at an edge of the foam hole . It said flow rate regulating means, the cut and raised foam hole, high expansion foam fire-extinguishing system according to claim 2, wherein the aperture restriction inclined piece der Rukoto formed by bending.

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