JPH08173565A - Fire extinguishing method for inert gas fire extinguisher and equipment thereof - Google Patents

Abstract

PURPOSE: To prevent shortage of oxygen even if a person is left in a fire fighting area by keeping oxygen concentration at the specific concentration or more in the fire fighting area during fire fighting. CONSTITUTION: Pressure sensors 15-1-15-3 are arranged in inert, gas fire extinguishing agent storage containers 1-1, 1-3, 1-5. In the case of a fire in a fire fighting area 6-1, a pressure in the inert. gas extinguishing agent storage container 1 is measured representatively by means of the pressure sensor 15-1. By the same way, the pressure sensor 15-2 responds to the fire fighting area 6-2, and the pressure sensor 15-3 responds to the fire fighting area 6-3. The detected pressure is fed to a control unit 16. The control unit 16 actuates an opening/closing valve 17 in a collecting pipe 4 and stops discharge of inert gas fire extinguishing agent to the inside of the fire fighting areas 6-1-6-3, so that oxygen concentration is kept at 12% or more. Alternatively, representative measurement can be carried out by means of the pressure sensor 15-3. The opening/closing valve 17 may be connected to main pipes 5-1-5-3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention discharges an inert gas extinguishing agent such as nitrogen gas into a fire extinguishing target compartment and maintains the concentration of the inert gas extinguishing agent in the fire extinguishing target compartment to be equal to or higher than the extinction concentration. The present invention relates to a fire extinguishing method and equipment for an inert gas fire extinguishing equipment designed to extinguish a fire.

[0002]

2. Description of the Related Art Conventionally, as a gas-based fire extinguishing facility, a gas-based fire extinguisher is released into a fire-extinguishing target compartment and the concentration of the gas-based fire-extinguishing agent in the target fire-extinguishing compartment is maintained to be equal to or higher than the extinction concentration to extinguish the fire A fire extinguishing agent that uses an inert gas such as carbon dioxide or halon gas has been put into practical use.

First, an example of the inert gas fire extinguishing equipment will be described with reference to FIG. In this example, three extinguishing target sections 6-
It shows the inert gas fire extinguishing equipment in the case of having 1, 6-2, 6-3. This inert gas fire extinguishing equipment uses, for example, nitrogen gas as an inert gas extinguishing agent and pressurizes it into a high-pressure gas container (at 35 ° C., 150 Kgf / square cm) into the fire extinguishing equipment. By storing, it is used as the inert gas fire extinguisher storage container 1. The inert gas fire extinguishing equipment of this example is equipped with five inert gas fire extinguishant storage containers 1-1, 1-2, ... 1-5, and each container 1 is connected via a container valve 2. The main pipe 5 connecting the connecting pipe 3 and further connecting the connecting pipe 3 to one collecting pipe 4 and extending the collecting pipe 4 to each of the fire extinguishing target sections 6-1, 6-2, 6-3 Connect to 1,5-2,5-3. Select valves 9-1, 9- are provided on the main pipes 5-1, 5-2, 5-3.
2, 9-3 are arranged, and fire extinguishing target sections 6-1, 6-2, 6
Inert gas extinguishant is selectively sent to -3. The main pipes 5-1, 5-2, 5-3 extending to the fire extinguishing target sections 6-1, 6-2, 6-3 are connected to the fire extinguishing target sections 6-1, 6-.
Branch pipes 8-1, 8-2, respectively arranged in 2, 6-3,
8-3, and a plurality of branch pipes 8-1, 8-2, 8-3 arranged in appropriate positions in the fire extinguishing target compartments 6-1, 6-2, 6-3. , 7-2, 7-3.

By the way, normally, each of the fire extinguishing target compartments 6-1,
Since 6-2 and 6-3 have different volumes, naturally, the amount of the inert gas fire extinguishing agent required for extinguishing the fire also differs. Therefore, the diameters of the main pipes 5-1, 5-2, 5-3 are made different according to the volumes of the fire extinguishing target sections 6-1, 6-2, 6-3, and in the event of a fire, Fire extinguishing target section 6-
The inert gas fire extinguishing equipment is configured such that the number of the inert gas fire extinguishant storage containers 1 corresponding to 1, 6-2, 6-3 is opened.

Here, the number of the inert gas extinguishant storage containers 1 to be opened is 5 for the fire extinguishing compartment 6-1 and 3 for the fire extinguishing compartment 6-2 and 1 for the fire extinguishing compartment 6-3. Set to. In the figure, 9-1, 9-2, 9-3 are selection valves, 10-1, 10-2, 10-3 are selection valve opening devices, and 11-1, 11-2, 11-3 are start-up devices. Gas container,
Reference numerals 12-1, 12-2, 12-3 are solenoids for opening the starting gas container. Also, in the figure, 13-1, 13-
Reference numerals 2 and 13-3 are starter gas pipelines for controlling the opening of the selection valves 9-1, 9-2 and 9-3 and the starter gas containers 11-1, 11-2 and 11-3. Opening device 10
-1, 10-2, 10-3, and non-return valves 14-1, 14-2, 14-3, 14-A, 1 at appropriate places on the way.
Arrange 4-B. In addition, non-return valve 14-1, 14-2,
The passable directions of 14-3, 14-A, and 14-B are indicated by the directions of the arrows in the figure. The numbers 1, 2, and 3 at the end of these members are the numbers 1, 2, and 3 at the end of the fire-extinguishing target section.
It corresponds to 3 respectively.

Next, the operation in case of fire will be described. Now, assuming that a fire has occurred in the fire extinguishing target section 6-1, when a person who discovers the fire operates the push button (in the case of manual operation) corresponding to the fire extinguishing target section 6-1, an electric signal opens the starting gas container. Sent to the solenoid 12-1 for the solenoid 1
2-1 operates and the starting gas container 11-1 is opened. The start-up gas released by opening the start-up gas container 11-1 is first of all selected valve opening device 10-1.
After opening the selection valve 9-1 by introducing the non-return valve 14
-1 through the starting gas line 13-1 and the non-return valve 14
-A and non-return valve 14-B are passed and all container valves 22 are reached, and all five inert gas fire extinguishant storage containers 1 are opened. At this time, since the non-return valve 14-2 and the non-return valve 14-3 cannot pass through the selection valve 9-2 and the selection valve 9
-3 is not released. As a result, the inert gas from the five opened inert gas extinguishant storage containers 1 is supplied with the inert gas from the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-1, and the main pipe 5-1.
And to the ejection head 7-1 through the branch pipe 8-1 so as to be discharged from the ejection head 7-1 into the fire extinguishing target section 6-1.

If a fire occurs in the fire extinguishing compartment 6-2, when a fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing compartment 6-2, an electric signal is activated. It is sent to the solenoid 12-2 for opening the gas container, and the solenoid 12-2 operates to start the gas container 11
-2 is released. The starting gas released by opening the starting gas container 11-2 is first introduced into the selection valve opening device 10-2 to open the selection valve 9-2, and then the non-return valve 14-. 2, passing through the starting gas line 13-2, passing through the non-return valve 14-B and reaching the container valve 22, only three inert gas extinguishant storage containers 1, that is, inert gas extinguishant storage Open the containers 1-3, 1-4, 1-5. At this time, since it cannot pass through the nonreturn valve 14-A, two of the inert gas extinguishant storage containers 1, that is, the inert gas extinguishant storage containers 1-1 and 1-2 are not opened. Moreover, since the non-return valve 14-1 and the non-return valve 14-3 cannot pass through, the selection valve 9-1 and the selection valve 9-3 are not opened. As a result, the inert gas is supplied from the three opened inert gas fire extinguishant storage containers 1-3, 1-4, and 1-5 to the container valve 2, the connecting pipe 3, the collecting pipe 4, and the selection valve 9-2. , To the jet head 7-2 via the main pipe 5-2 and the branch pipe 8-2, and is discharged from the jet head 7-2 into the fire extinguishing target section 6-2.

If a fire occurs in the fire extinguishing compartment 6-3, when the fire finder operates a push button (in the case of manual operation) corresponding to the fire extinguishing compartment 6-3, an electric signal is activated. It is sent to the solenoid 12-3 for opening the gas container, and the solenoid 12-3 operates to start the gas container 11.
-3 is released. The starting gas released by opening the starting gas container 11-3 is first introduced into the selection valve opening device 10-3 to open the selection valve 9-3, and then the non-return valve 14-. 3 through the starting gas pipeline 13-3 to the container valve 22 and only one inert gas extinguishant storage container 1, that is, the inert gas extinguishant storage container 1-5.
Open up. At this time, since the non-return valve 14-B cannot pass through (therefore, the non-return valve 14-A cannot pass through, of course), four of the inert gas fire extinguishant storage containers 1, that is, Inert gas extinguishant storage container 1
-1,1-2,1-3,1-4 are not opened. Also,
Since the non-return valve 14-1 and the non-return valve 14-2 cannot pass through, the selection valve 9-1 and the selection valve 9-2 are not opened. As a result, the inert gas is discharged from the opened inert gas fire extinguisher storage container 1-5 to the container valve 2, the connecting pipe 3, the collecting pipe 4, the selection valve 9-3, the main pipe 5-3 and the branch. Tube 8
-3 to the ejection head 7-3, the ejection head 7
-3 to the fire extinguishing target section 6-3.

By the way, Table 1 shows a concrete example 1 of the above-mentioned inert gas fire extinguishing equipment.

[0010]

[Table 1]

Table 1 shows the fire extinguishing target section 6 for Example 1.
Although the relationship between the volume of -1, 6-2, 6-3 and the required amount of extinguishant, extinguishant concentration, oxygen concentration, etc. is shown, in this example, the extinguishing target sections 6-1, 6-2 are shown. , 6-3, the concentration of the inert gas extinguishing agent is 35% or more, which is the designed concentration, and the oxygen concentration is 12% or more, which is the allowable concentration for the human body in a short time. There is no particular problem from the viewpoint of performance and the life of the person left behind in the fire-extinguishing compartment.

In this way, a plurality of inert gas extinguishant storage containers 1 are prepared so that the total amount of the inert gas extinguishant becomes the amount necessary for extinguishing the fire extinguishing target compartment, and the inert gas extinguishing agent is extinguished. It has been generally practiced that the agent storage container is commonly used by a plurality of fire extinguishing target compartments.
Depending on the relationship between the volume of 1,6-2,6-3 and the volume of each inert gas extinguishant storage container, a problem may occur from the viewpoint of fire extinguishing performance or the human life of the person left behind in the fire extinguishing target compartment. Can be considered. Specific example 2 in that case
Is shown in Table 2.

[0013]

[Table 2]

Table 2 is similar to Table 1 for Example 2,
Although the relationship between the volume of the fire extinguishing target compartments 6-1, 6-2, 6-3 and the required amount of the extinguishant, the extinguishant concentration, the oxygen concentration, etc. is shown, in this example, the fire extinguishing target compartment 6-1. , 6-2, 6-
The concentration of the inert gas extinguishing agent for 3 is 35% or more, which is the designed concentration, but in the fire extinguishing target sections 6-2, 6-3, the oxygen concentration is 12% or less, which is the allowable concentration for the human body in a short time. , There will be a problem in terms of the life of the person left behind in the fire-extinguishing compartment.

[0015]

As described above, in the conventional inert gas fire extinguishing equipment, the inert gas extinguishing agent for the extinguishing target section is designed to have an inert gas extinguishing agent concentration equal to or higher than the designed concentration. The reality is that the amount of extinguishant is designed, and no consideration is given to the human lives of those left behind in the fire-extinguishing target area.

The present invention solves the problems of the above conventional inert gas fire extinguishing equipment, and even if there is a person left behind in the fire extinguishing target compartment, the oxygen deficiency is caused by the release of the inert gas extinguishing agent. It is an object of the present invention to provide a safe fire extinguishing method and equipment for an inert gas fire extinguishing equipment that does not cause fire.

[0017]

In order to achieve the above object, the method of the present invention releases an inert gas fire extinguisher in a fire-extinguishing target compartment and determines the concentration of the inert gas fire-extinguishing agent in the fire-extinguishing target compartment. A method of extinguishing in an inert gas fire extinguishing facility, which is designed to extinguish a fire by maintaining the extinction concentration or more,
When extinguishing a fire, the main point is to maintain the oxygen concentration in the extinguishing target area at 12% or more.

The first inert gas fire extinguishing equipment of the present invention is equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment of the method of the present invention, wherein a pressure sensor is provided in the inert gas extinguishant storage container. However, the gist is that an on-off valve is provided, which operates in response to the output signal of the pressure sensor and stops the release of the inert gas extinguishing agent into the fire extinguishing target compartment.

Further, the second inert gas fire extinguishing equipment of the present invention is equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment of the method of the present invention, wherein an oxygen concentration sensor is arranged in the fire extinguishing target compartment, The gist of the invention is to dispose an on-off valve that operates in response to the output signal of the oxygen concentration sensor to stop the release of the inert gas fire extinguishing agent into the fire extinguishing target compartment.

Further, the third inert gas fire extinguishing equipment of the present invention is equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment of the method of the present invention, and has released the inert gas extinguishing agent into the fire extinguishing target compartment. The gist is that a timer for measuring the time is provided, and an on-off valve is provided for operating in response to the output signal of the timer to stop the release of the inert gas extinguishing agent into the fire extinguishing target compartment.

Further, the fourth inert gas fire extinguishing equipment of the present invention is equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment of the method of the present invention, and the surplus inert gas fire extinguishing agent is provided outside the fire extinguishing target compartment. The gist is that an inert gas fire extinguisher discharge pipe for discharging is provided so as to be branched from the main pipe.

As the inert gas extinguishing agent used in the present invention, in addition to a single inert gas such as nitrogen gas, any one or more of nitrogen, argon, neon, helium, krypton or xenon can be used. A mixed gas obtained by mixing the above gases can be used. Table 3 shows an example of the above mixed gas.

[0023]

[Table 3]

Nitrogen gas, argon gas, helium gas and the like used as the inert gas fire extinguishing agent in the present invention are particularly safe for humans.

In order to maintain the oxygen concentration in the fire-extinguishing target compartment at 12% or more when extinguishing the fire, even if there are a plurality of fire-extinguishing compartments, the inert gas extinguishant storage container is not shared and Install an inert gas extinguishant storage container with a volume that corresponds to the volume of the fire-extinguishing target compartment. For example, in the example 2 shown in Table 2, there are 5 inert gas extinguishant storage containers with a capacity of 10 cubic meters for the extinguishing target section 6-1 and 7 cubic meters for the extinguishing target section 6-2. 3 inert gas extinguishant storage containers
One, an inert gas fire extinguisher storage container with a capacity of 6.8 cubic meters is installed for each of the fire extinguishing compartments 6-3. The volume of the inert gas extinguishing agent is adjusted so that the total amount of the inert gas extinguishing agent is the maximum amount required for extinguishing the extinguishing target section and considering the relationship with the volume of other extinguishing section. A plurality of storage containers 1 are prepared, and this inert gas extinguishant storage container is shared by a plurality of fire extinguishing target compartments. For example, in Example 2 shown in Table 2, seven inert gas extinguishant storage containers having a volume of 7.1 cubic meters are installed in the fire extinguishing target section 6-1 and the fire extinguishing target section 6-2 is installed. Of these, three are discharged, and one is discharged to the fire extinguishing section 6-3. However, none of these methods can be said to be a preferable solution because the number of inert gas extinguishant storage containers increases and the cost of equipment increases.

[0026]

[Operation] By maintaining the oxygen concentration in the fire extinguishing compartment at 12% or more during extinguishing, even if there is a person left behind in the fire extinguishing compartment, the inert gas extinguishant is released to cause oxygen deficiency. Therefore, the safety of the inert gas fire extinguishing equipment can be improved.

[0027]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 shows a first embodiment of the inert gas fire extinguishing equipment of the present invention. In addition, the inert gas fire extinguishing equipment of the present invention including the second to fourth examples of the inert gas fire extinguishing equipment of the present invention described later is an improvement to the conventional inert gas fire extinguishing equipment shown in FIG. 5 described above. The basic structure and operation are shown in FIG.
Since it is the same as the inert gas fire extinguishing equipment shown in, only the improvements will be described below.

In this inert gas fire extinguishing facility, the oxygen concentration in the fire extinguishing compartment during the fire extinguishing is maintained at 12% or more by regulating the amount of the inert gas extinguishing agent released to each fire extinguishing compartment. In this case, a pressure sensor is installed in the inert gas extinguishant storage container, and an on-off valve that operates by receiving the output signal of the pressure sensor and stops the release of the inert gas extinguishant into the fire extinguishing compartment is installed. It was done.

In this embodiment, pressure sensors 15 are provided in the inert gas fire extinguisher storage containers 1-1, 1-3 and 1-5, respectively.
-1, 15-2, 15-3 are provided, and the pressure sensor 15-
When a fire occurred in the fire extinguishing section 6-1 due to 1,
Inert gas fire extinguishant storage container 1 when a fire occurs in the extinguishing target section 6-2 by the pressure sensor 15-2 and when a fire occurs in the extinguishing target section 6-3 by the pressure sensor 15-3. The internal pressure is representatively measured. Pressure sensor 15-1, 15-
The output signals of 2, 15-3 are sent to the control unit 16, and the control unit 16 actuates the on-off valve 17 arranged in the collecting pipe 4 to extinguish the fire extinguishing sections 6-1, 6-2, 6-3. The release of the inert gas fire extinguisher is stopped inside. The pressure sensor may be configured to measure the pressure in the inert gas fire extinguisher storage container 1 on behalf of only the pressure sensor 15-3, and the opening / closing valve 17 may be the main pipe 5-.
It can also be arranged at 1, 5-2 and 5-3.

According to this inert gas fire extinguishing equipment, the pressure in the inert gas fire extinguisher storage containers 1-1, 1-3, 1-5 which is lowered by the discharge of the inert gas fire extinguisher is measured. Therefore, fire extinguishing target sections 6-1, 6-2, 6-3
The amount of the inert gas extinguishing agent released into the interior is calculated in real time, and the amount of the inert gas extinguishing agent released is calculated in advance for each of the fire extinguishing target sections 6-1, 6-2, 6-3.
When the set value stored in the above is reached, the control unit 16 actuates the on-off valve 17 arranged in the collecting pipe 4 to prevent the fire extinguishing target compartments 6-1, 6-2, 6-3 from entering the interior. Stop the release of active gas extinguishing agents. In this case, the amount G of the released inert gas fire extinguishing agent can be calculated by the following calculation formula. G = ((Po-P) / Pa) * V * N where G: amount of released inert gas fire extinguisher (cubic meter) Po: pressure of the inert gas fire extinguisher (initial value) P: inert gas Extinguishant pressure (current value) Pa: Atmospheric pressure V: Capacity (cubic meter) per inert gas extinguishant storage container N: Number of open inert gas extinguishant storage containers. In this case, even if the actual space volume in the fire extinguishing target compartment fluctuates after being set, it can be easily dealt with by simply changing the set value of the pressure of the inert gas extinguishing agent stored in the control unit 16. .

As a result, the fire extinguishing target sections 6-1, 6-
The release amount of the inert gas fire extinguishant for each of 2, 6-3 is set to a predetermined value, that is, the concentration of the inert gas fire extinguisher is 35% or more which is the designed concentration, and the oxygen concentration is against the human body for a short time. It can be regulated to 12% or more which is the allowable concentration.

FIG. 2 shows a second embodiment of the inert gas fire extinguishing equipment of the present invention.

This inert gas fire extinguishing system is designed to maintain the oxygen concentration in the fire extinguishing target compartment at 12% or more during the fire extinguishing by measuring the oxygen concentration in the fire extinguishing target compartment. An oxygen concentration sensor is provided in the above, and an on-off valve is provided which operates upon receiving the output signal of the oxygen concentration sensor and stops the release of the inert gas extinguishing agent into the fire extinguishing target compartment.

In this embodiment, the fire extinguishing target section 6-
1, 6-2, 6-3 to the oxygen concentration sensor 18-1,
18-2 and 18-3 are provided, and the fire extinguishing target sections 6-1 and 6 are provided.
The oxygen concentrations in −2 and 6-3 are measured.
The output signals of the oxygen concentration sensors 18-1, 18-2, 18-3 are sent to the control unit 19, and the control unit 19 actuates the on-off valve 17 arranged in the collecting pipe 4 to extinguish the fire extinguishing target section 6
The release of the inert gas fire extinguishing agent into -1, 6-2, 6-3 is stopped. The on-off valve 17 can also be arranged in the main pipes 5-1, 5-2, 5-3.

According to this inert gas fire extinguishing equipment, the oxygen concentration in the fire extinguishing target compartments 6-1, 6-2, 6-3, which decreases due to the release of the inert gas fire extinguisher, is measured in real time. When the measured value reaches the set value stored in the control unit 19 in advance, the control unit 19 operates the open / close valve 17 arranged in the collecting pipe 4 to extinguish the fire extinguishing sections 6-1 and 6-2. , 6-3 stop releasing the inert gas fire extinguishing agent. In this case, even if the actual space volume in the fire-extinguishing target compartment changes after being set, it is possible to respond without making adjustments.

As a result, the fire extinguishing target sections 6-1, 6-
The release amount of the inert gas fire extinguishant for each of 2, 6-3 is set to a predetermined value, that is, the concentration of the inert gas fire extinguisher is 35% or more which is the designed concentration, and the oxygen concentration is against the human body for a short time. It can be regulated to 12% or more which is the allowable concentration.

FIG. 3 shows a third embodiment of the inert gas fire extinguishing equipment of the present invention.

In this inert gas fire extinguishing equipment, the oxygen concentration in the fire extinguishing compartment at the time of extinguishing is maintained at 12% or more by regulating the amount of the inert gas extinguishing agent released to each fire extinguishing compartment. In this case, a timer that measures the time when the inert gas fire extinguisher is released is placed in the fire extinguishing compartment, and it operates by receiving the output signal of the timer to release the inert gas extinguishing agent into the fire extinguishing compartment. An on-off valve for stopping is provided.

In this embodiment, the fire extinguishing target section 6-
Timers 20-1, 20-2, 20 for measuring the time of releasing the inert gas fire extinguishing agent corresponding to 1, 6-2, 6-3
-3 is disposed in the control unit 21, and the fire extinguishing target sections 6-1 and 6 are provided.
The time taken for the inert gas fire extinguishing agent to be released within -2 and 6-3 is measured. Timer 20-1, 20-
The output signals of 2 and 20-3 are sent to the control unit 21, and the control unit 21 actuates the on-off valve 17 arranged in the collecting pipe 4 to extinguish the fire extinguishing sections 6-1, 6-2, 6-3. The release of the inert gas fire extinguisher is stopped inside. The on-off valve 17 can also be arranged in the main pipes 5-1, 5-2, 5-3.

According to this inert gas fire extinguisher, by measuring the time when the inert gas fire extinguishing agent is released, the fire of the inert gas extinguished into each of the fire extinguishing target compartments 6-1, 6-2, 6-3 is measured. The amount of the active gas fire extinguishing agent is calculated in real time, and the amount of the released inert gas fire extinguishing agent is used as the fire extinguishing target sections 6-1, 6-.
When the set value stored in the control unit 21 in advance for every 2 and 6-3 is reached, the control unit 21 activates the open / close valve 17 arranged in the collecting pipe 4 to extinguish the fire extinguishing target section 6-1,
6-2, 6-3 The release of the inert gas fire extinguisher is stopped. In this case, the timers 20-1, 20-2,
The set value of 20-3, that is, the amount G of the inert gas extinguishing agent to be released, is the time (t) when the inert gas extinguishing agent is released into the fire extinguishing target sections 6-1, 6-2, 6-3. And the average flow rate (Q) of the inert gas extinguishing agent discharged from the ejection heads 7-1, 7-2, 7-3 (t × Q).
In addition, normally, in case of fire,
Since the required amount of fire extinguishing agent (required amount of inert gas fire extinguishing agent) must be designed to be released into the fire-extinguishing target area within 60 seconds, the average flow rate (value obtained by dividing the amount of fire extinguishing agent required by 60 seconds). ), The pressure loss from the inert gas fire extinguisher storage container 1 to the ejection heads 7-1, 7-2, 7-3 is calculated,
The orifice diameters of the ejection heads 7-1, 7-2, 7-3 are determined. For example, in the second example shown in Table 2, the average flow rate (Q) of the inert gas extinguishing agent discharged from the ejection heads 7-1, 7-2, 7-3 is set to the ejection head 7-1, that is, the fire extinguisher. 0.82 per second for the target section 6-1
5 cubic meters, the jet head 7-2, that is, the fire extinguishing section 6-2, 0.350 cubic meters per second, the jet head 7-3, that is, the fire extinguishing section 6-3.
In the case of 0.14 cubic meters per second, the inert gas extinguishing agent is set to be discharged. In the case of this embodiment, the timers 20-1, 20-2, 20-3 are usually used.
The setting value of 60 seconds may be set to 60 seconds, but if the actual space volume in the fire extinguishing target compartment fluctuates after being set, the timer 20-
Only by changing the set values of 1, 20-2 and 20-3, it is possible to easily cope with the situation.

As a result, the fire extinguishing target sections 6-1, 6-
The release amount of the inert gas fire extinguishant for each of 2, 6-3 is set to a predetermined value, that is, the concentration of the inert gas fire extinguisher is 35% or more which is the designed concentration, and the oxygen concentration is against the human body for a short time. It can be regulated to 12% or more which is the allowable concentration.

FIG. 4 shows a fourth embodiment of the inert gas fire extinguishing equipment of the present invention.

This inert gas fire extinguishing system is designed to maintain the oxygen concentration in the fire extinguishing target compartment at the time of extinguishing by releasing excess surplus inert gas extinguishing agent to the outside of the fire extinguishing target compartment. Then, an inert gas fire extinguisher discharge pipe for discharging the excess inert gas fire extinguisher to the outside of the fire extinguishing target compartment is provided by branching from the main pipe.

In this embodiment, the inert gas from the main pipes 5-2 and 5-3 for sending the inert gas extinguishing agent to the extinguishing target sections 6-2 and 6-3 excluding the maximum extinguishing target section 6-1. The extinguishant discharge pipes 22-2 and 22-3 are branched, and the ejection heads 23-2 and 23-3 are arranged at the tips thereof. In addition, when excess inert gas extinguishing agent is generated even in the largest extinguishing target section 6-1, the inert gas extinguishing agent is sent from the main pipe 5-1 which sends the inert gas extinguishing agent to the extinguishing target section 6-1. The discharge pipe 22-1 is branched and the jet head 23-1 is arranged at the tip thereof.

According to this inert gas fire extinguishing equipment, the surplus inert gas fire extinguishing agent, that is, the inert gas fire extinguishing agent released from the inert gas fire extinguishing agent storage container 1 and each of the fire extinguishing target sections 6-2, 6 -3, the difference from the required inert gas extinguishing agent is automatically released from the ejection heads 23-2, 23-3 to the outside of the fire extinguishing section via the inert gas extinguishing agent discharge pipes 22-2, 22-3. To do. In this case, the amount of the inert gas extinguishing agent released outside the fire-extinguishing target compartment is
-Relationship between the orifice diameters of the ejection heads 7-2 and 7-3 of 6-3 and the orifice diameters of the ejection heads 23-2 and 23-3 of the inert gas extinguishing agent discharge pipes 22-2 and 22-3. Determined by For example, in the second example shown in Table 2, from the ejection head 7-2, that is, for the fire extinguishing target section 6-2, 21 cubic meters per minute, the ejection head 23-2
From 9 cubic meters per minute, and also jet head 7-3
That is, that is, 6.8 cubic meters per minute is set for the fire extinguishing target section 6-3, and 3.2 cubic meters per minute is set for the inert gas fire extinguishing agent to be discharged from the injection head 23-3. . In this case, even if the actual space volume in the fire extinguishing target compartment fluctuates after being set, the inert gas fire extinguishing agent discharge pipe 22-
It is possible to easily deal with this by simply replacing the ejection heads 2 and 22-3.

As a result, the extinguishing target sections 6-1, 6-
The release amount of the inert gas fire extinguishant for each of 2, 6-3 is set to a predetermined value, that is, the concentration of the inert gas fire extinguisher is 35% or more which is the designed concentration, and the oxygen concentration is against the human body for a short time. It can be regulated to 12% or more which is the allowable concentration.

In the above, the first to fourth embodiments of the inert gas fire extinguishing equipment of the present invention have been described by taking as an example the case where there are three extinguishing target compartments and the number of the extinguishant storage containers 1 is five. The number of fire-extinguishing target compartments and the number of extinguishant storage containers and the number of extinguishant storage containers to be opened are not limited to those of this embodiment, and can be arbitrarily set as necessary. The procedure is similar to that of the above embodiment.

[0048]

According to the present invention, by maintaining the oxygen concentration in the fire extinguishing target compartment at the time of extinguishing at 12% or more, even if there is a person left behind in the fire extinguishing target compartment, it becomes inactive. There is no risk of oxygen deficiency due to the release of the gas fire extinguishing agent, and the safety of the inert gas fire extinguishing equipment can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an inert gas fire extinguishing facility of the present invention.

FIG. 2 is a diagram showing a second embodiment of the inert gas fire extinguishing equipment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the inert gas fire extinguishing equipment of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the inert gas fire extinguishing equipment of the present invention.

FIG. 5 is a diagram showing a conventional inert gas fire extinguishing facility.

[Explanation of symbols]

 1 Fire-extinguishing agent storage container 4 Collecting pipe 5-1 Main pipe 5-2 Main pipe 5-3 Main pipe 6-1 Extinguishing target section 6-2 Extinguishing target section 6-3 Extinguishing target section 7-1 Injection head 7-2 Injection Head 7-3 Injection head 15-1 Pressure sensor 15-2 Pressure sensor 15-3 Pressure sensor 16 Control part 17 Open / close valve 18-1 Oxygen concentration sensor 18-2 Oxygen concentration sensor 18-3 Oxygen concentration sensor 19 Control part 20- 1 Timer 20-2 Timer 20-3 Timer 21 Control Part 22-2 Inert Gas Extinguishant Release Pipe 22-3 Inert Gas Extinguishant Release Pipe 23-2 Jet Head 23-3 Jet Head

Claims (5)

[Claims] 1. An inert gas fire extinguisher adapted to extinguish a fire by releasing an inert gas fire extinguisher into the fire extinguishing target compartment and maintaining the concentration of the inert gas fire extinguishing agent in the fire extinguishing target compartment to be equal to or higher than the extinction concentration. A fire extinguishing method for an equipment, wherein the oxygen concentration in a fire extinguishing target compartment during extinguishing is maintained at 12% or more. 2. The equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment according to claim 1, wherein a pressure sensor is provided in the inert gas extinguishant storage container, and it operates upon receiving an output signal of the pressure sensor. However, the inert gas fire extinguishing equipment is provided with an on-off valve for stopping the release of the inert gas fire extinguishing agent into the fire extinguishing target compartment. 3. The equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment according to claim 1, wherein an oxygen concentration sensor is provided in a fire extinguishing target compartment, and the oxygen concentration sensor operates by receiving an output signal of the oxygen concentration sensor. An inactive gas fire extinguishing facility having an opening / closing valve for stopping the release of the inert gas fire extinguishing agent into the fire extinguishing target compartment. 4. The equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment according to claim 1, wherein a timer for measuring the time of releasing the inert gas fire extinguishing agent is provided in the fire extinguishing target compartment, and the timer is provided. An inactive gas fire extinguishing facility, which is provided with an on-off valve that operates in response to the output signal of the above and stops the release of the inert gas extinguishing agent into the fire extinguishing target compartment. 5. The equipment used for the fire extinguishing method in the inert gas fire extinguishing equipment according to claim 1, further comprising an inert gas fire extinguishant discharge pipe for discharging excess inert gas fire extinguishing agent to the outside of the fire extinguishing target compartment. Inert gas fire extinguishing equipment, which is provided by branching from the main pipe.