JP4823955B2 - High expansion foam fire extinguishing equipment and foaming method thereof - 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 equipment and a foaming method thereof.

  In the foam fire extinguishing equipment, a foam aqueous solution (hereinafter sometimes simply referred to as “aqueous solution”) is discharged from a radiating nozzle, and the foam is made to blow by colliding with a foaming net and sucking in air. Filled and extinguishing 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 flow path tube having a built-in radiation nozzle and causes the aqueous solution discharged from the radiation nozzle to collide with a foaming net to foam. A spray nozzle is provided between the radiation nozzle and the foaming net to spray a fluid in a direction to block the flow path.

  The axis of the spray nozzle according to the present invention is directed in a direction orthogonal to the axis of the flow path cylinder. The axis of the spray nozzle of the present invention is inclined to the radiation nozzle side or the opposite side. The spray nozzle according to the present invention is connected to an aqueous solution supply source of the radiation nozzle.

The present invention relates to a foaming method for a high expansion foam fire extinguishing equipment that sucks air in a discharge section into a flow path cylinder, discharges an aqueous solution from a radiation nozzle provided in the flow path cylinder, and collides with a foaming net. A spray nozzle is provided between the radiation nozzle and the foaming net, and a flow rate regulating curtain for spraying fluid from the spray nozzle to block the flow path is formed.

  The fluid supplied to the spray nozzle of the present invention is an aqueous solution or an inert gas.

  Since the present invention is configured as described above, the fluid ejected from the spray nozzle scatters in the direction of blocking the flow path while forming droplets, thereby forming a flow rate regulating curtain. Therefore, the aqueous solution radiated from the radiating nozzle collides with the curtain and is reduced in speed, and then collides with the foaming net, so that it easily foams.

  Further, when the aqueous solution is sprayed from the spray nozzle, the amount of the aqueous solution that foams by colliding with the foaming net 7 is obtained by adding the amount of the aqueous solution sprayed from the spray nozzle to the amount of the aqueous solution radiated from the radiation nozzle. Become. Therefore, since the amount of foaming can be increased as compared with the conventional case where the aqueous solution is emitted only from the radiation nozzle, fire extinguishing can be performed quickly and efficiently. That is, when an aqueous solution is supplied to the spray nozzle, a mist-shaped flow rate regulating curtain is formed, the flow rate of the aqueous solution radiated from the radiation nozzle is reduced, and a larger amount of aqueous solution can be foamed than in the conventional example. it can.

  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, as a result of conducting a research experiment, the present inventor has found that a spray nozzle may be provided between the radiation nozzle and the foam net. That is, it has been found that the above problem can be solved by forming a flow rate regulating curtain by spraying fluid from the spray nozzle and reducing the flow rate by colliding the droplet of foam aqueous solution radiated from the radiation nozzle to the curtain. . This invention is made | formed based on the said knowledge.

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 is a foam generator provided with a flow path cylinder 2, and the foaming ratio is set to 500. The flow channel cylinder 2 is provided with a foaming portion 3 for sucking air in the discharge section 1.

  A foaming net (net) 7 is stretched on the foaming portion 3 at the tip of the flow path cylinder 2, and a plurality of radiations that are opposed to the foaming net 7 with a gap therebetween. A nozzle 9 is provided. The radiation nozzle 9 is connected to an aqueous solution supply source (mixer) (not shown) that generates a foam aqueous solution (aqueous solution), which is a mixed solution of foam stock solution and water.

  A spray nozzle 10 is provided between the foaming net 7 and the radiation nozzle 9. A plurality of the spray nozzles 10 are provided at equal intervals in the circumferential direction, and the axis 10c thereof faces in a direction orthogonal to the axis 2c of the flow path cylinder 2.

  As the spray nozzle 10, for example, four so-called fan-shaped nozzles are used. However, as long as a mist-like flow rate regulating curtain FC can be formed, the shape, the number, and the like can be freely selected. The spray nozzle 10 communicates with the aqueous solution supply source of the radiation nozzle 9.

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 room air, that is, the smoke in the room (discharge section) 1 in which the flow path cylinder 2 is disposed in the foaming portion 3 of the flow path cylinder. While the air K containing H is sucked, the aqueous solution w is discharged as droplets from the radiation nozzle 9.

  At this time, since the foam aqueous solution w is sprayed from the spray nozzle 10, a mist-like flow rate regulating curtain FC is formed in the flow path cylinder 2. The curtain FC is formed so as to block the flow path, and is configured as a curtain having a certain thickness with the droplets distributed almost evenly. Therefore, the droplet of the aqueous solution radiated from the radiating nozzle 9 collides with the curtain FC and is decelerated and then collides with the foaming net 7 and enters the mesh. 10), it is slower than that. Therefore, since it will be in the state which is easy to foam, the droplet of aqueous solution can form the highly expanded foam 12 efficiently.

  Further, as described above, the foam aqueous solution w sprayed from the spray nozzle 10 forms a mist-like flow rate regulating curtain FC, and the droplet of the foam aqueous solution w is the aqueous solution w radiated from the radiation nozzle 9. It is pulled by the liquid droplets and collides with the foaming net 7 of the foaming part 3 and foams. Therefore, the total supply amount of the aqueous solution in the fire extinguishing equipment is the sum of the amount from the radiation nozzle 9, for example, 40 L, and the amount from the spray nozzle 10, for example, 20 L, that is, 60 L. Therefore, since the supply amount of the aqueous solution is increased as compared with the conventional example, the amount of foaming is increased, and the fire-extinguishing effect can be improved early. Also, for example, by providing a spray nozzle even in a normal 40L type foam fire extinguishing equipment (foam generator), the performance of the 60L type foam generator can be provided. Can be reduced.

A second embodiment of the present invention will be described with reference to FIG. 3. 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 the axial direction of the spray nozzle and the fluid supplied to the spray nozzle.

The axis 10c of the spray nozzle 10 is inclined toward the radiation nozzle 9 and intersects the axis 2c of the flow path tube 2 at an inclination angle θ. By inclining in this way, the fluid from the spray nozzle 9 is ejected in the direction toward the droplet of the aqueous solution w radiated from the radiation nozzle 9, so that the flow rate regulating effect can be improved compared to the above embodiment. Can do. Note that the inclination angle θ can be appropriately selected as necessary.
If the speed is reduced, the axis 10c of the injection nozzle 10 can be inclined in the opposite direction, that is, in the opposite direction to the radiation nozzle 9.

As the fluid supplied to the spray nozzle 10, water or an inert gas such as nitrogen, carbon dioxide, or argon may be used instead of the aqueous solution (foam aqueous solution).
When the water is used, since the aqueous foam solution radiated from the radiation nozzle is diluted, it is preferable to use a slightly darker one as the aqueous foam solution.

The pressure of the fluid supplied to the radiation nozzle is higher than the pressure of the fluid supplied to the spray nozzle, for example, the former is 0.5 MPa / cm ^2, the latter is set to 0.20 MPa / cm ² However, these pressures are appropriately selected as necessary.

It is a longitudinal cross-sectional view which shows 1st Example of this invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a longitudinal cross-sectional view which shows 2nd Example of this invention, and is a figure corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Release section 2 Channel cylinder 3 Foam part 7 Foaming net 9 Radiation nozzle 10 Spray nozzle 12 High expansion foam FC Flow rate regulation curtain

Claims (6)

A high-expansion foam fire extinguishing facility that sucks air in a discharge section into a flow path tube having a built-in radiation nozzle 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 comprising a spray nozzle for spraying a fluid in a direction to block a flow path between the radiation nozzle and the foaming net.   2. The high expansion foam fire extinguishing equipment according to claim 1, wherein an axis of the spray nozzle is oriented in a direction orthogonal to an axis of the flow path cylinder.   2. The high expansion foam fire extinguishing equipment according to claim 1, wherein an axis of the spray nozzle is inclined toward the radiation nozzle or the opposite side.   2. The high expansion foam fire extinguishing equipment according to claim 1, wherein the spray nozzle is connected to an aqueous solution supply source of the radiation nozzle. A foaming method for a high expansion foam fire extinguishing equipment that sucks air in a discharge section into a flow path cylinder, discharges an aqueous solution from a radiation nozzle provided in the flow path cylinder and collides with a foaming net,
A spray nozzle is provided between the radiation nozzle and the foaming net ,
A foaming method for a high expansion foam fire extinguishing equipment, characterized in that a flow rate regulating curtain is formed by spraying fluid from the spray nozzle to block a flow path. 6. The foaming method for a high expansion foam fire extinguishing facility according to claim 5, wherein the fluid supplied to the spray nozzle is an aqueous solution or an inert gas.

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