JPH1157055A - Fine mist fire-extinguishing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an effective fire-extinguishing by an optimum mist particle diameter corresponding with the scale of a fire by a method wherein a large particle diameter head and a small particle diameter head are arranged to be adjacent, and at the time of a fire, a fine mist of a comparatively large particle diameter and a fine mist of a comparatively small particle diameter are alternately jetted by a time division from the large particle diameter head and the small particle diameter head. SOLUTION: As a fine mist head unit 1 which is installed on the ceiling surface of a protecting section 4 such as a computer room or the like, a large particle diameter head 2 and a small particle diameter head 3 are arranged to be adjacently, and from the large particle diameter head 2, a fine mist of a comparatively large particle diameter, e.g. 200 μm, is jetted, and from the small particle diameter head 3, a fine mist of a comparatively small particle diameter, e.g. about 50-100 μm is jetted. Then, flames are judged when receiving a signal of a flame sensor 12, and when a fire pump 5 is started, control valves 8, 9 are alternately opened/closed by a time division by a control panel 11, and after a jetting from the large particle diameter head 2 with the large particle diameter is performed for a specified period of time, the jetting is switched to a jetting from the small particle diameter head 3 with the small particle diameter, and these motions are alternately repeated.

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 extinguishing fire by spraying fine spray water having a particle size of several tens to several hundreds of micrometers into a fire source.

[0002]

2. Description of the Related Art Conventionally, a fine spray fire extinguishing system has been used as a fire extinguishing system for a protection section such as a computer room which cannot cause water damage. The fine spray fire extinguishing system supplies fire fighting water to the spray head under pressure, and sprays fine spray with a particle size of several tens to several hundreds of micrometers toward the fire source, ensuring no water damage. Fire extinguishing system.

Conventionally, as a spray nozzle used in this kind of fine spray fire extinguishing system, a fire extinguishing liquid composite spray nozzle that emits droplets having different particle sizes is known (Japanese Patent Laid-Open No. 8-266).
676). In this injection nozzle, a fire-extinguishing liquid having a large particle diameter of 70 μm or more and 400 μm or less is injected from the center of the nozzle, and a fire-extinguishing liquid having a small particle diameter of 70 μm or less is injected around the nozzle. By the combined injection of the fire-extinguishing liquids with different particle diameters, the small-sized fine spray is applied to the flow of the large-sized central spray to reach the fire point, covering the fire source and suffocating / cooling fire extinguishing Let me.

[0004] In another conventional fine spray fire extinguishing system, water is sprayed by changing the particle size of water spray from a particle size in a mist state to a state of raindrops in proportion to the degree of progress of a fire (Japanese Patent Laid-Open No. HEI 9-279421). 8-27628).

[0005]

The basic concept of the fine spray fire extinguishing system is to reduce the size of droplets used for fire extinguishing and increase the specific surface area to promote evaporation, and to evaporate heat during evaporation. To extinguish combustible gas from a combustion source by diluting combustible gas from a fire source, diluting combustible gas with steam, diluting oxygen concentration, or jetting generated by spray pressure. .

Here, the specific surface area S when a fixed volume of water is sprayed from the 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 S = (4πr ² ) / (4/3) (πr ³ ) = 3 / r, and the smaller the particle diameter r, the larger the specific surface area S can be.

For this reason, in the fine spray fire extinguishing system,
An important point is how to efficiently evaporate the fine spray water injected into the fire source in a high-temperature space caused by a fire. That is, the scale of the fire source, the droplet size of the fine spray, the initial momentum of the droplet, the relative position between the spray head and the fire source, and the like are important points for determining the fire extinguishing ability. However, in the conventional fine spray fire extinguishing system, even if a very small droplet is supplied from the injection head to the combustion field where the heat convection is generated by the flame of the fire, the momentum reaches the high temperature part to be evaporated by the heat convection. There was a problem that it could not be reached due to the shortage, it could not be efficiently evaporated in a high-temperature space, and it took time to extinguish the fire.

When large droplets are sprayed on a small-scale fire source that is about to be extinguished, the amount of heat generated for evaporating the droplets due to the fire is insufficient, and the droplets cannot completely evaporate and become invalid water. There was a problem that water loss was caused. The present invention has been made in view of such a conventional problem, and provides a fine spray fire extinguishing system that enables efficient fire extinguishing with a simple configuration and an optimum spray particle size suitable for the scale of a fire. The purpose is to:

[0009]

In order to achieve this object, a fine-spray fire extinguishing system according to the present invention comprises a large-particle-size head for ejecting fine-particles having a relatively large particle size, and a large-particle-size head. A small particle size head that is arranged adjacently and sprays a fine particle spray with a relatively small particle size, and a fine particle spray with a relatively large particle size and a relatively small size are alternately time-divided from a large particle size head and a small particle size head in a fire. A fine spray control unit for spraying fine spray having a particle size.

Here, the large particle size head jets fine spray having a relatively large particle size of about 200 μm, and the small particle size head jets fine spray having a relatively small particle size of about 50 to 100 μm. As described above, in the fine spray fire extinguishing system of the present invention, a relatively large spray particle diameter (about 200 μm) and a relatively small spray particle diameter (50 to 100 μm) are used.
m) small particle size heads are arranged adjacent to each other and sprayed alternately from these two heads in a time-sharing manner. If the fire source is large, the fire can be efficiently extinguished with the spray timing of the large spray particle size, and the fire source is small. If the spray timing is small, the fire is efficiently extinguished and a reliable fire extinguishing effect is provided, and the fire extinguishing can be performed efficiently with less water damage.

Furthermore, a simple structure of alternately spraying from two spray heads having different spray particle diameters is sufficient, and it can be easily realized at low cost.

[0012]

FIG. 1 is a system configuration diagram of an embodiment of a fine spray fire extinguishing system according to the present invention. In FIG. 1, a fine spray head unit 1 is installed on a ceiling surface of a protection section 4 such as a computer room. As the fine spray head unit 1 of the present invention, a large particle size head 2 and a small particle size head 3 are used. The composite head is arranged adjacently. The large particle size head 2 ejects fine spray having a relatively large particle size of, for example, about 200 μm.

On the other hand, the small particle size head 3 is, for example, 50
A fine spray having a relatively small particle size of about 100 μm to 100 μm is sprayed. A water supply pipe 7 from a fire pump 5 is connected to the large particle size head 2 and the small particle size head 3 provided in the fine spray head unit 1 via control valves 8 and 9, respectively. As the control valves 8 and 9, for example, an electric valve or a solenoid valve can be used. An accumulator 10 is connected in the middle of the water supply pipe 7, and the fine spray head unit 1
It has the function of accumulating pressure that suppresses fluctuations in pressurized fire extinguishing water due to the injection of fine spray from the fire. The fire extinguishing pump 5 draws, for example, fire extinguishing water from a water source water tank 6, pressurizes the water to a predetermined pressure, and supplies the water to a fine spray head unit 1 from a water supply pipe 7.

The control valves 8 and 9 provided in the water supply pipe 7 for the large particle size head 2 and the small particle size head 3
Is driven to open and close. A signal line from a fire detector 12 installed in the protection section 4 is connected to the control panel 11,
The signal line of the pressure sensor 13 provided in the water supply pipe 7 is also connected, and the drive motor of the fire pump 5 is further connected.

The control panel 11 is provided with a fine spray control section 11a. For example, when a fire signal from the fire detector 12 is received and a fire in the protection section 4 is determined, the fire pump 5 is started and the pressure sensor 13 is turned on. It is confirmed from the pressure detection signal that the pressure in the water supply pipe 7 is equal to or higher than a specified pressure, and the control valves 8 and 9 are alternately opened and closed in a time-division manner. Then, the spraying is switched to the spraying of the small particle size from the small particle size head 3, and this is repeated alternately.

FIG. 2 shows a fine spray control unit 1 provided on a control panel 11.
5 is a time chart of the amount of water discharge with respect to the passage of time of the large particle size head 2 and the small particle size head 3 according to 1a. In this time chart, first, as shown in FIG. 2A, a large particle size head 2 sprays a fine spray having a large particle size over a certain period of time T1, and then switches to a small particle size head 3 to maintain a constant size. The fine spray having a small particle diameter is jetted over the time T2, and this is alternately repeated.

FIG. 3 is a flowchart of a control process by the fine spray control section 11a provided in the control panel 11 of FIG. First, in step S1, the presence or absence of a fire alarm by the fire detector 12 installed in the protection section 4 is monitored. Protection section 4
When a fire occurs and an alarm signal is received from the fire detector 12, this fire alarm is determined and the process proceeds to step S2.
Start the fine spray fire extinguishing system.

That is, the fire pump 5 is started and the pressure sensor 1
In step 3, it is checked that the pressure of the water supply pipe 7 is equal to or higher than a specified pressure, and a system operation state is created. Subsequently, in step S3, the control valve 8 is opened, and fine spray having a relatively large particle size than the large particle size head 2 is sprayed toward the fire source F in the protection section 4 for a certain time T1. Subsequently, in step S4, the presence or absence of a system stop command based on fire suppression confirmation is checked. If there is no stop command, the control valve 8 is closed and the control valve 9 is opened at the same time in step S5. The spray is sprayed for a certain time T2. Subsequently, in step S6, it is checked whether or not there is a system stop command based on fire suppression confirmation. If there is no stop command, the process returns to step S3, in which the large particle size head 2 discharges fine spray, and this is repeated thereafter.

When a system stop command based on fire suppression confirmation is determined in step S4 or step S6, the process proceeds to step S7, in which the fine spray fire suppression system is stopped, ie, the fire pump 5 is stopped, and the control valves 8, 9 are turned off. The fire extinguishing is stopped, and a series of processing ends. Here, steps S4 and S
The fire extinguishing confirmation of No. 6 may be set manually by the observer after confirming the condition of the protection section 4 or by using the recovery type as the fire detector 12 and the alarm signal from the fire detector 12 being a predetermined signal. It may be determined that the fire is extinguished when it cannot be obtained continuously for a long time.

The fire source F alternates between the injection of fine spray having a relatively large particle diameter from the large particle head 2 and the injection of fine spray having a relatively small particle diameter from the small particle head 3 according to the present invention. When the scale of the fire source F is large, the inside of the fire source F is controlled by a sufficient amount of droplet momentum with respect to the fire scale mainly by fine spray of a relatively large particle size from the large particle size head 2. By infiltrating and evaporating to the maximum, efficient fire extinguishing can be achieved.

When the scale of the fire source F is reduced due to the fire extinguishing by spraying from the large particle size head 2, the spray is switched to the relatively small particle size spray by the small particle size head 3. A droplet having a relatively small particle size corresponding to the source F is ejected to the fire source F, and even if the droplet is small, the fire source F
Since the size of the droplet is small, the droplet sufficiently penetrates into the high-temperature portion and evaporates completely, so that the fire can be surely extinguished and efficient fire extinguishing can be realized without generating invalid water.

As a result, the fire source F quickly converges and shifts to a fire suppression state by alternately spraying fine sprays by the time division of the large particle size head 2 and the small particle size head 3. In addition, in the time chart of FIG.
Although the case where the water discharge time T2 of the small particle size head 3 is equal to the water discharge time T1, the water discharge time T1, T2 may be switched continuously or in multiple stages according to the scale of the fire source.

That is, when the fire source scale is large, the water discharge time T1 of the large particle size head 2 is made longer and the water discharge time T2 of the small particle size head 3 is made shorter. When the fire scale becomes smaller, the water discharge time T2 of the small particle size head 3 may be increased and the water discharge time T1 of the large particle size head 2 may be reduced.

[0024]

As described above, according to the present invention, the large-grain head and the small-grain head are alternately driven in a time-division manner to spray fine particles having a relatively large particle diameter and a relatively small particle diameter. By switching and injecting, compared to the case where the spray particle size is fixed, efficient fire extinguishing can be realized by fine spray of large particle size if the scale of the fire source is large, and small particle size if the scale of the fire source is small. Efficient fire extinguishing by fine spray can be realized, and on average fire extinguishing efficiency can be improved and water loss can be reduced as compared with fine spray having a fixed particle size.

Further, since a simple structure of alternately ejecting from two spray heads having different spray particle diameters is sufficient, the equipment cost for constructing the system can be easily realized at low cost.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a fine spray fire extinguishing system of the present invention.

FIG. 2 is a time chart of a jetting operation of a large particle size head and a small particle size head in FIG.

FIG. 3 is a flowchart of fine spray extinguishing control by a control unit in FIG. 1;

[Explanation of symbols]

 1: Fine spray head unit 2: Large particle size head 3: Small particle size head 4: Protective compartment 5: Fire pump 6: Water source tank 7: Water supply piping 8, 9: Control valve 10: Accumulator 11: Control panel 11a: Fine Spray control unit 12: Fire detector 13: Pressure sensor

Claims (2)

[Claims] A large particle size head for ejecting fine spray having a relatively large particle size; a small particle size head disposed adjacent to the large particle size head for ejecting fine spray having a relatively small particle size; And a fine spray control unit for spraying fine spray of a relatively large particle size and fine spray of a relatively small particle size alternately in a time-sharing manner from the large particle size head and the small particle size head at times. A fine spray fire extinguishing system. 2. The fire-extinguishing system according to claim 1, wherein said large-grain head ejects fine spray having a relatively large particle diameter of about 200 μm, and said small-grain head emits fine spray of about 50 μm to 100 μm. A fine spray fire extinguishing system characterized by ejecting fine spray having a relatively small particle size.