JPH1170182A - Mist fire extinguishing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fire extinguishing performance in a part where mist from an adjacent atomizer head is overlapped. SOLUTION: A system is provided with plural atomizer heads 1A-1D which are distributed and arranged two-dimensionally at the ceiling surface side of a protection section, plural head groups A-D where the plural atomizer heads are constituted by group so as to prevent vapor from the atomize heads belonging to the same group from being overlapped and an atomizer control part 10 for supplying fire extinguishing water in order by head group unit, converting fire extinguishing water into mist and discharging it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine spray fire extinguishing system for discharging fire-extinguishing water supplied under pressure from a spray head into fine spray having a particle size of about several tens to several hundreds of micrometers.

[0002]

2. Description of the Related Art Conventionally, the basic concept of this kind of fine spray fire extinguishing system is to promote evaporation by reducing the size of droplets used for fire extinguishing and increasing the specific surface area, thereby evaporating when evaporating. To increase fire extinguishing ability by removing heat from a fire source, diluting combustible gas with steam, diluting oxygen concentration, or scavenging combustible gas from a combustion field by a jet generated by spray pressure. is there.

Here, the specific surface area S when a fixed volume of water is sprayed from a spray head to form fine spray is defined as S = (surface area) / (volume). The droplet that has been finely sprayed is regarded as a sphere and the radius is r
Then, the specific surface area S becomes: (4πr2) / (4/3) (πr3) = 3 / r, and the smaller the particle diameter r, the larger the specific surface area S can be.

[0004] Also, because of the fine spray, when the size of the fire source becomes large, it is extremely difficult for the droplet particles to reach the combustion field against the generated heat convection, so that the spray pressure becomes high or the inert gas becomes inert. Micro-atomization is performed by two fluids that finely atomize and extinguish fire-extinguishing water by releasing gas. Furthermore, once a fire is generated, such as a pool fire, the fire easily returns when a small flame remains.

[0005]

In consideration of the fire extinguishing mechanism of the fine spray fire extinguishing system, it is possible to make the fine spray reach the fire source as quickly as possible without uneven water density.
It is an important point to enhance fire fighting ability. On the other hand, the living space and the protection space are generally not covered by one fine spray head, and it is necessary to arrange them properly so that the spray distributions of a plurality of spray heads overlap each other.

[0006] When a spraying experiment was conducted by disposing a plurality of spraying heads as described above, the fine sprays stayed in the air in a portion where the fine sprays emitted from the adjacent heads overlapped without going to the fire source. A phenomenon was seen. This retention phenomenon of fine spray is caused by the fact that droplet particles emitted from adjacent heads collide with kinetic components in opposite directions, and the kinetic energy is greatly reduced.

For this reason, when a fire occurs in a portion where the fine sprays from the adjacent heads overlap, the fine sprays emitted from the heads rapidly lose kinetic energy due to a collision phenomenon, and are blown back by the hot air flow due to the fire. As a result, there was a problem that the fire extinguishing ability could not reach the combustion field and the fire extinguishing performance was significantly reduced. The present invention has been made in view of such a problem, and an object of the present invention is to provide a fine spray fire extinguishing system that improves fire extinguishing performance in a portion where fine sprays from adjacent fine spray heads overlap. And

[0008]

In order to achieve this object, in the fine spray fire extinguishing system according to the present invention, a plurality of spray heads which are two-dimensionally distributed and arranged on the ceiling side of the protection compartment are provided. A plurality of head groups in which a plurality of spray heads are grouped so that the sprays from the spray heads belonging to the group do not overlap, and fire extinguishing water is supplied in order to each head group, and the fire extinguishing water is atomized and discharged. A spray control unit.

Here, the plurality of head groups form a group of the plurality of spray heads so that the spray heads belonging to the same group are not adjacent to each other. In addition, the fine spray control unit provides an electric valve in each of the branch pipes for supplying pressurized fire-extinguishing water for each head group, and controls opening and closing of a plurality of electric valves in order. According to such a fine spray extinguishing system of the present invention, fine sprays are discharged from the adjacent fine spray heads to the overlap region with a time lag, and kinetic energy is reduced due to collision of fine sprays having different motion directions. Since there is no liquid, a sufficient supply of droplets to the combustion field can be ensured, and the fire extinguishing ability does not decrease.

[0010] Also, by avoiding mutual interference of droplets,
Sufficient overlap of the adjacent heads is enabled, a uniform amount of fine spray is supplied, and a stable fire extinguishing ability can be maintained. Furthermore, by spraying alternately in groups,
The amount of water for fire extinguishing water can be further reduced.

[0011]

FIG. 1 is an explanatory diagram showing an embodiment of a fine spray fire extinguishing system according to the present invention. In this embodiment, the protection sections of the building in FIG. 1 are divided into four groups of head groups A, B, C and D, and each of the fine spray heads 1A, 1B, 1C and 1D is divided into groups. A plurality is provided. The fine spray heads 1A to 1D divided for each of the head groups A to D are separately connected to branch pipes 3A, 3B, 3C and 3D for each group, and are connected to the branch pipe 3A.
3D are provided with electric valves 2A, 2B, 2C, 2D. The water supply main pipe 3 branched from the branch pipes 3A to 3D is connected to the projecting side of the fire pump 4, and the suction side of the fire pump 4 is lowered to the water source water tank 6. The fire pump 4 is driven by a motor 5 and supplies pressurized fire extinguishing water to each of the branch pipes 3A to 3D via the water supply main pipe 3. A priming tank 7 is provided for the fire pump 4.

In the middle of the water supply main pipe 3, an accumulator 8 is provided.
Is provided, accumulates fire extinguishing water, and the fine spray heads 1A to 1A are provided.
The water supply pressure when the fire extinguishing water is atomized and discharged from D is compensated for. The electric valves 2A to 2D and the fire pump 4 are connected to a control panel 9, and the control panel 9 is provided with a function as a fine spray control unit 10. When receiving an alarm signal from a fire detector (not shown) or an instruction to start fire extinguishing by a supervisor, the fine spray control unit 10 operates the fire extinguishing pump 4 by starting the motor 5 to supply pressurized fire extinguishing water. In this state, the electric valves 2A, 2B, 2C, and 2D are controlled to open and close in the order of the head groups A, B, C, and D, and the discharge of the fine spray of fire-extinguishing water is shifted with time for each of the head groups A to D. Let it do.

FIG. 2 shows a plurality of fine spray heads 1 provided in FIG.
It is an explanatory view of arrangement of A-1D, and group composition. In FIG. 2, the plurality of fine spray heads are arranged in a staggered pattern in this embodiment, and the plurality of fine spray heads are grouped so that fine sprays from the spray heads belonging to the same group do not overlap. doing. Specifically, a group of a plurality of spray heads is configured so that the spray heads belonging to the same group are not adjacent to each other. For example, when looking at the fine spray heads 1A belonging to the head group A, the fine spray heads belonging to the other head groups B to D, for example, the two fine spray heads at the left end, are necessarily located on a straight line connecting the two fine spray heads 1A at the shortest distance. The fine spray head 1C belonging to the head group C is located between the spray heads 1A. Therefore, the fine spray heads belonging to the head group A are not adjacent to each other because the fine spray heads of the other groups are located therebetween. This relationship is the same for the fine spray heads 1B, 1C and 1D belonging to the other head groups BD. For example, when the fine spray head 1A at the lower left end is viewed from the fine spray heads 1A to 1D, the distance between the fine spray heads 1A to 1D and the fine spray heads 1C of the head group C is L. Then, the spraying range may be determined so as not to exceed the head interval L.

FIG. 3 is a time chart for controlling the discharge of the fine spray for each of the head groups A to D by the fine spray controller 10 provided in the control panel 9 of FIG. In the fine spray discharge control, the electric valve 2A is controlled to open for the fine spray head 1A of the head group A to supply pressurized fire extinguishing water to discharge the fine spray for a certain time, and then the control valve 2A At the same time, the electric valve 2B for the fine spray head 1B belonging to the head group B is controlled to open, and the discharge of the fine spray from the head group B is started simultaneously with the stop of the discharge of the fine spray of the head group A. Similarly, the fine spray of the fire-extinguishing water is released in the order of the head groups B, C, and D for a certain period of time, and the process returns to the head group A again and repeats.

For this reason, even if the fine spray heads are arranged as shown in FIG. 2, the fine spray heads 1A to 1D belonging to the head groups A to D emit fine sprays shifted in time, so that the same heads are discharged. Overlap does not occur in the discharge of fine spray from the fine spray head belonging to the group, droplets in different motion directions collide with each other due to the overlap, the kinetic energy drops sharply, and it is scattered by the hot air flow due to fire and burns It is possible to reliably prevent the drop where the droplet does not reach the field. Further, the fine sprays of the head groups A to D do not overlap with each other, but the overall fine spray distribution shows that the fine sprays between the fine spray heads of the adjacent different head groups overlap sufficiently. As a result, the spray amount of the fine spray can be made uniform as a whole.

Although the above embodiment has been described with reference to a case where a large number of fine spray heads are arranged, the present invention can be applied to a case where at least three fine spray heads are arranged in the protective compartment. Further, the water discharge time for each head group can be appropriately determined as needed. Further, the water discharge time may not be fixed, and the water discharge time may be determined according to the scale of the fire.

[0017]

As described above, according to the present invention, even when a plurality of spray heads are dispersedly arranged in the protective compartment, the fine spray of fire-extinguishing water between adjacent fine spray heads can be dispersed in time. The movement is performed in a staggered manner, so that in the overlap region of the adjacent fine spray heads, there is no decrease in the movement ability due to the collision phenomenon between the fine sprays having different movement directions, and even in the overlap region, the droplet is not sufficiently provided to the combustion field. Supply can be secured and a high fire extinguishing ability can be obtained.

Further, by avoiding mutual interference of the droplets discharged from the adjacent fine spray heads, it is possible to sufficiently overlap with the adjacent heads, and as a result, a uniform spray amount of fine spray is ensured. A stable high fire extinguishing ability can be maintained. Further, by alternately spraying the fuel at intervals in groups, the amount of water for fire extinguishing water can be further reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a fine spray fire extinguishing system of the present invention.

FIG. 2 is an explanatory diagram of the arrangement and group configuration of the fine spray head of FIG. 1;

FIG. 3 is a time chart of the spray control performed by the fine spray control unit of FIG. 1 sequentially for each head group.

[Explanation of symbols]

 1A to 1D: fine spray head 2A to 2D: motorized valve 3: water supply main pipe 3A to 3D: branch pipe 4: fire extinguishing pump 5: motor 6: water source tank 7: priming tank 8: accumulator 9: control panel 10: fine spray Control unit

Claims (3)

[Claims] 1. A plurality of spray heads which are two-dimensionally distributed on the ceiling side of a protection section, and the plurality of spray heads are grouped so that sprays from spray heads belonging to the same group do not overlap. A micro-spray fire extinguishing system, comprising: a plurality of head groups; and a micro-spray control unit that sequentially supplies fire-extinguishing water to the head groups, atomizes the fire-extinguishing water, and discharges the fine-spray water to the protective compartment. . 2. The fire-extinguishing system according to claim 1, wherein the plurality of head groups are formed such that the spray heads belonging to the same group are not adjacent to each other. Features a fine spray fire extinguishing system. 3. The fine-spray fire extinguishing system according to claim 1, wherein the fine-spray control unit is provided with a motor-operated valve in each of branch pipes for supplying pressurized fire-extinguishing water for each of the head groups. A fine spray fire extinguishing system characterized by controlling opening and closing of electric valves in order.