JP3467587B2 - Firefighting equipment for enclosed space - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing facility for extinguishing or suppressing a fire in an enclosed space in which electric equipment such as a computer room and a telephone exchange room is installed.

[0002]

2. Description of the Related Art Conventionally, in a computer room, telephone exchange room, machine room, etc., a closed type sprinkler head is arranged on the ceiling part of the enclosed space equipped with the electric equipment as fire extinguishing equipment, and the enclosed space in case of fire There is a sprinkler system that heats the head to release water when the temperature rises.

In this sprinkler equipment, when a fire occurs, the sprinkler head mounted on the ceiling surface automatically detects the fire due to the heat-sensitive operation, and sprays water from the sprinkler head onto the fire source and its surroundings to cause a fire. The fire is efficiently extinguished in the early stages.

[0004]

This method of extinguishing fire by sprinkling water from the ceiling surface is suitable for extinguishing an initial fire, since the fire extinguishing water having a particle diameter of about 1 mm is dropped from the sprinkler head in the form of heavy rain. However, there is a problem that water loss will be severe. In particular, water damage in the computer room, which accumulates large amounts of data and materials, poses a serious problem.

Halon is used as a fire-extinguishing agent in an enclosed space in which electric devices that dislike water damage are installed. This halon easily boils at low temperature and becomes vapor, and since this vapor is non-combustible and heavier than air, when it radiates to combustible materials, it immediately vaporizes and burns It has the effect of suffocating fire extinguishing oxygen by shutting off oxygen and lowering the oxygen concentration, has a large fire extinguishing ability, and has the feature that there is almost no stain after fire extinguishing. However, this halon is a type of CFC gas that destroys the ozone layer surrounding the earth, so its use is prohibited.

Further, it has been proposed to use carbon dioxide (CO ₂ ) as a fire extinguishing agent which does not cause water loss and hardly causes fouling after fire extinguishing. Since this CO ₂ is a non-combustible gas and has a specific gravity heavier than air, it is possible to extinguish a fire by covering the combustion surface with this non-combustible gas without spreading to the upper part. In addition, since this CO ₂ is chemically relatively stable, it will not be contaminated in the fire chamber after extinguishing the fire, and also has high electrical insulation, so electrical equipment such as a computer room or a telephone exchange room will be used. Suitable for extinguishing the enclosed space equipped.

However, since this CO ₂ dilutes the oxygen concentration of the air around the radiated fire source to about 21% to 14% to make it incombustible and extinguishes by suffocation, a person in a sealed room escapes to the outside. After confirming the above, the interior of the room is sealed and fire extinguishing work is being performed by CO ₂ radiation. Therefore, before extinguishing a fire, enter the fire room only after the gas in the room is sufficiently discharged and safety is confirmed. Since CO ₂ released from the gas injection nozzle exit velocity is too fast, the wall surface of the enclosed space does not flow to the fire source in the electrical equipment of Computer etc. will come to linear, the fire source due to the diffusion of CO ₂ The combustion surface cannot be covered with an inert gas and CO
₂ High density spots occur.

[0008] After extinguishing portion at the emission of CO ₂ stops radiation of a the CO ₂ at high temperature, there is a risk of afterburning for air flow. Therefore, it is necessary to back up the valuable data stored in the computer before the fire spreads throughout the room from extinguishing the initial fire, but it is dangerous to enter the room, so back up the data. There is a problem that can not be done.

[0009]

SUMMARY OF THE INVENTION The present invention, when a fire occurs in an enclosed space in which electric equipment is installed, such as a computer room or a telephone exchange room, especially when the fire occurs in the computer room, etc. The purpose is to detect fires, suppress fires, and secure the time when data backup is possible. In order to achieve the above object, the present invention provides a closed space equipped with an electric device such as a computer, a fire detector for detecting low-concentration smoke generated in the closed space, and a fire of the fire detector. A fire extinguishing agent holding device that holds a fire extinguishing agent that is activated by a signal is installed, and a package air conditioner that can convey a circulating airflow is installed in the free access where a cable connecting to the electric device is wired. A fire extinguisher holding device that is activated by a fire signal from the fire detector is provided with a gas injection nozzle with the head directed to the upper and lower floors, or with the head oriented so that the radiation ports face each other in free access. The average oxygen concentration after release is 18
% Or more or more of the inert gas is directed toward the upper and lower floors of the free access, or by a gas injection nozzle with the head facing so that the radiation ports face each other in the free access. A fire extinguisher in an enclosed space that suppresses combustion by transporting a scattered flow of an inert gas generated by the collision of the released gases with each other or a circulating air flow to the fire source. In addition, the gas injection nozzle with the head facing the upper and lower floors of the free access, or with the head facing the radiation opening in the free access, is located near the circulation return air intake of electrical equipment such as computers. It was the fire extinguishing equipment in the enclosed space located at.

[0010]

[Operation] When a fire occurs in an enclosed space where electrical equipment is installed, such as a computer room or telephone exchange room, a fire detector installed in the enclosed space causes low-concentration smoke generated in the enclosed space. When a fire signal is detected by the fire detector or its light-receiving part, the fire extinguishing agent holding device is activated. The emission gas from the gas injection nozzle, which has the outlet directed or the head arranged so that the emission ports in the free access face each other, is decelerated by colliding with the upper and lower floor surfaces, or the released gas, Moreover, since it diffuses, it can be carried by the circulating airflow from within the free access and easily enter the inside of electric equipment such as a computer. Further, since the released gas is uniformly diffused, the concentration of the gas does not change.

When the amount of the inert gas discharged as a fire extinguishing agent is set so that the average oxygen concentration in the enclosed space is about 18% or more, the human body becomes uncomfortable, and the computer room is used after extinguishing the initial fire. You can enter the room and back up the data.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fire extinguishing equipment of the enclosed space according to the present invention, for example, the fire extinguishing equipment of the enclosed space of electric equipment such as a computer room will be described. FIG. 1 shows a state in which the fire extinguishing equipment of the present invention is installed in a computer room, 1 is an enclosed space of the computer room, 2 is a computer (electronic computer), and 3 is a package air conditioner as an example of an air conditioner. The circulating airflow 3a of the package air conditioner 3 is
As shown in FIG. 2, it passes through the free access 4 in the enclosed space where the cables for connecting to the computer are routed, and its upper and lower floor surfaces 4a.
It is taken into the electric device part of the computer 2 through the circulating air intake 2a provided in the computer to prevent the electric equipment from being heated and to clean the air in the computer room.

Reference numeral 5 is a fire detector for detecting low-concentration smoke generated in the enclosed space, and a fire extinguishing agent holding device 6 which is activated by a fire signal from the fire detector 5 is provided. As shown in FIG. 4, a discharge gas injection nozzle 7 of CO ₂ which is an inert gas for the fire extinguishing agent held by the fire extinguishing agent holding device 6 is arranged downstream of the intake 3b of the circulating air flow 3a of the free access 4. However, the gas injection nozzle 7 is installed so that its emission port faces the floor surfaces 4 a and 4 b forming the free access 4.
Further, as shown in FIG. 3, the gas injection nozzle 7 is provided with the branch pipe 1 so that its emission ports face each other in the free access 4.
1 may be used, or the emission port may be installed toward the side wall surface forming the free access 4. As shown in FIG. 4, the gas injection nozzles 7 may be formed so as to radiate toward the free access upper and lower floor surfaces 4a and 4b in the vicinity of the circulating air flow inlet 2a of each computer 2.

As shown in FIG. 5, the extinguishant holding device which is activated by the fire signal of the fire detector 5 is designed so as not to cause an oxygen deficiency state when CO ₂ is released into the enclosed space. The amount of CO that makes the average CO ₂ concentration in the enclosed space around 10%
_{It has two} storage cylinders 8 each holding 55 kg of 2.
Here, a CO ₂ concentration of 10% corresponds to an O ₂ concentration of about 20%. The CO ₂ holding amount of the above extinguishant holding device is assumed to have a protective volume of 500 m ^3, and is not limited to this. Further, in FIG. 5, 9 is an activation unit, and 10 is an operation unit.

Although the extinguishing agent of the gas injection nozzle is stored in the extinguishant holding device set in the enclosed space in the embodiment, the invention is not limited to this. An extinguishant holding device installed outside the space may be used. Next, the operation of the fire extinguishing equipment will be described. When the low concentration smoke, for example, the smoke having a concentration of 2% / m is detected from the fire detector 5 and a fire signal is output to the extinguishant holding device 6, the device 6 The activating section 9 operates to open a discharge valve (not shown). As a result, the CO ₂ stored in the cylinder 8 is released from the gas injection nozzle 7 into the free access 4 of the enclosed space 1. When the gas injection nozzle 7 is installed so that its emission port faces the floor surface 4a or 4b (FIG. 4), CO ₂ emitted from each nozzle 7 collides with the floor surface 4a, 4b. Further, when the gas injection nozzles 7 are installed such that their emission ports face each other (FIG. 3), CO ₂ emitted from the nozzles 7 collide with each other.
The floor 4a, collides with 4b or CO ₂ to CO ₂ together collides, is uniformly diffused into the free access 4 with significantly decelerated speed by the collision. The decelerated and diffused CO ₂ is carried by the circulating airflow 3a supplied from the air conditioner 3 into the free access 4 through the intake port 3b, and flows into each computer 2 through the circulating airflow intake port 2a. The air flow that carries the CO ₂ further flows out of the computer 2 through the vent holes 2b provided on the upper surface and the side surface of each computer 2, and flows into the air conditioner 3 from the intake port 3c. As a result, during the CO ₂ emission in the free access 4 and each computer 2 where a fire is likely to occur, a relatively rich CO ₂ suitable for extinguishing flows, and in the room where the computer 2 is installed, The CO ₂ that has passed through the computer ₂ is diffused and released. In the above example, the case where a fire detector that detects smoke is used has been described.However, as a fire detector, a fire detector that detects heat, flame, gas, odor, etc. other than smoke that occurs during a fire is used. Alternatively, instead of installing the fire detector in the enclosed space 1, it may be provided outside the enclosed space and the air in the enclosed space may be guided to the fire detector by a sampling pipe. Further, instead of installing the packaged air conditioner in the enclosed space, the circulating airflow may be supplied to the free access 4 from the air conditioner provided outside the enclosed space. Furthermore, as an inert gas for fire extinguishing, nitrogen (N ₂ ), argon (Ar), alternative halon (trade name FC-3110, HFC)
-227ea) or a mixed gas thereof may be used.

[0016]

INDUSTRIAL APPLICABILITY The present invention is a fire detector installed in a closed space in which an electric device is installed, such as a computer room or a telephone exchange room, which is burned by a fire signal when a fire is detected. Since the inert gas held by the suppressor holding device is radiated into the free access to suffocate and extinguish the fire, unlike the conventional sprinkler fire extinguisher, water damage is not caused.

By making the average oxygen concentration in the enclosed space after releasing the inert gas held by the fire extinguishing agent holding device to be about 18% or more, it is suitable as an initial fire extinguishing for computers and the like that are averse to water loss, and also in the initial stage. Data can be backed up immediately after extinguishing in a room where a fire has occurred. The concentration of the inert gas corresponding to the average oxygen concentration of 18% is about 14% in CO ₂ concentration or Ar concentration, and about 82% in N ₂ concentration.

In an enclosed space using free access such as a computer room, an inert gas is released into the free access, and the free access passes through the inside of electrical equipment such as a computer and the enclosed space such as a computer room. By returning to the free access, the inert gas is released from under the electric equipment such as a computer to suppress the combustion, and the release from the free access can protect the free access.

In the case of releasing an inert gas into the free access in an enclosed space using the free access such as a computer room, if the inert gas is released at the same speed at which it is released, the speed is too fast. However, the inert gas does not flow uniformly from the free access to the inside of an electric device such as a computer, but directly reaches the wall surface in the free access.

In the fire extinguishing equipment of the present invention, the cylinder of the inert gas is stored in the extinguishant holding device, and the pipe for releasing the inert gas is provided in the free access so that the gas can be discharged on the floor of the free access in case of fire. Since the gas is discharged by hitting it on the bottom surface or between the gases to be discharged, the gas discharge speed is reduced, the gas diffuses uniformly, and variations in the inert gas concentration are prevented. Inert gas can easily enter inside and wrap the fire source to extinguish the suffocation.

In addition, the extinguishing speed is high due to the synergistic effect of the cooling action due to the sudden drop in temperature due to the latent heat of vaporization due to the emission of the inert gas into the free access and the diluting action of the oxygen concentration of the air. Further, since it is used in a small enclosed space such as a computer, it is possible to use a low concentration of inert gas, and there is no damage due to water loss.

Since the gas injection nozzles are respectively provided in the vicinity of the circulating air flow inlet of the electric equipment such as each computer, it is possible to prevent the electric equipment other than the fire source from being burnt.

[Brief description of drawings]

FIG. 1 is a perspective view of an enclosed space equipped with a fire extinguishing facility of the present invention.

FIG. 2 is a diagram showing a state of taking in an inert gas from free access.

FIG. 3 is a plan view of an arrangement state of gas injection nozzles.

FIG. 4 is a side view of an arrangement state of gas injection nozzles.

FIG. 5 is a front view of a fire extinguishing agent holding device.

[Explanation of symbols]

1 Enclosed spaces such as computer rooms 2 computer 2a Return air intake 3 package air conditioners 3a Circulating air flow 3b Circulating air flow outlet 4 free access 4a Free access floor top 4b Free access floor underside 5 Fire detector 6 Fire extinguishing agent holding device 7 gas injection nozzle 8 Inert gas storage cylinder 9 Start-up section 10 Operation part 11 Branch pipe

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-259473 (JP, A) JP-A-6-70993 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A62C 3/00-3/16 A62C 27/00-39/00

Claims (3)

(57) [Claims] 1. A closed space provided with an electric device such as a computer is provided with a fire detector for detecting a fire phenomenon occurring in the closed space, and a cable for connecting the electric device is wired. One or more gas injection nozzles are provided in the free access of the space, and the enclosed space or outside the enclosed space,
An air conditioner for generating a circulating air flow in the enclosed space through the free access and an extinguishant holding device for holding an inert gas supplied to the gas injection nozzle at the time of starting are provided, and the gas injection nozzle is provided with an injection port thereof. However, when the fire detector detects a fire phenomenon that is determined to be a fire, the fire agent is arranged so as to face the upper or lower floor surface or the side wall surface of the free access or the injection ports face each other. Before activating the holding device and releasing the inert gas from the gas injection nozzle in the free access
Inert gas is transported into electrical equipment by the circulating air flow.
Fire-extinguishing system of enclosed space, characterized in that it makes. 2. The free-access gas injection nozzles for the upper and lower floors are respectively arranged in the vicinity of the return airflow inlet of each electric device such as each computer. Fire extinguishing equipment in an enclosed space. 3. The enclosed space according to claim 1, wherein the inert gas is carbon dioxide, nitrogen, argon, an alternative halon, or a mixed gas of the carbon dioxide, nitrogen, argon and an alternative halon. Fire extinguishing equipment.