JP3397382B2 - Carbon dioxide fire extinguishing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide fire extinguishing facility provided with safety measures.

[0002]

2. Description of the Related Art Fire extinguishing by carbon dioxide extinguishes a fire, that is, by shutting off the supply of oxygen necessary for combustion, by extinguishing carbon dioxide which is an inert gas. There is a discharge method. The whole area release method seals a room with a fire risk when a fire occurs,
This is a method of extinguishing the gas by extinguishing the amount of gas required for extinguishing it all at once, and in a room or a large factory where it cannot be sealed, it is extinguished by a local emission method that locally reduces the oxygen concentration. The fire extinguisher and the mobile type can also be called a local discharge method.

[0003] differs from the carbon dioxide fire extinguishing equipment other fire extinguishing equipment, fire extinguishing agents is that it does not require fire pump a gas, also diffuses and penetrates into any location for fire extinguishing agent is a gas In addition, there is no risk of contamination, leakage, corrosion, and damage, and since it is non-conductive, it has the advantage that it can be used in electrical equipment that is energized. There are two types of operating methods for the carbon dioxide extinguishing equipment, a manual type and an automatic type. The manual type is a method of confirming a fire by a fire detection or an alarm of an automatic fire alarm equipment, and manually releasing the fire. The automatic type automatically extinguishes fire by interlocking with an automatic fire detection device, and automatically performed all related operations such as fire detection, fire alarm, ventilation system stop, power related stop, door closure. Released later,
Extinguish the fire completely automatically.

[0004]

Since carbon dioxide fire extinguishing equipment has a choking action, it is dangerous to use it by mistake.
A sign indicating that carbon dioxide fire extinguishing equipment is installed in the protected area, an indicator light indicating that the gas is full at the time of carbon dioxide release, a separate retractable entrance and exit in the protected area, etc. Security measures are taken.

However, in recent years, an accident due to erroneous release of carbon dioxide has become a problem, and in many cases, an inspector often suddenly starts when the equipment is restored during maintenance and inspection, and the inspector meets the accident. This is because carbon dioxide is released by accidentally starting with the start switch on when the equipment is restored, and in the case of an actual fire, carbon dioxide is emitted after an alarm and delay time. However, when carbon dioxide is suddenly released, carbon dioxide is released all at once, so if there are people who are doing inspection work, a choking accident will occur.

[0006]

The present invention provides a carbon dioxide fire extinguishing system of the type that discharges the entire area to a protected area,
A delayed release means for limiting the amount of released carbon dioxide is provided, and the delayed release means prohibits the opening of one or more of the carbon dioxide cylinders out of the required number of carbon dioxide cylinders in the protected area where the fire is occurring. It is characterized by being either an opening prohibition means or a passage restraining means for limiting the amount of carbon dioxide passing through the pipe to the protected area where the fire is occurring. In addition, the delayed release means is a signal when a timer that starts at the same time as carbon dioxide release and counts a predetermined time elapses, or a signal that a gas concentration meter provided in the protection section detects a predetermined concentration of a specific gas. It is canceled based on the crab.

According to another aspect of the invention, a required number of carbon dioxide releasing heads are provided for each of the protective sections of the building, and the control panel opens the required fire extinguishing cylinders to the protective sections. Which selectively opens each control valve provided in the pipe to control the release destination of carbon dioxide, and an emergency stop switch is provided in each of the protection compartments, according to the input of the emergency stop switch. The control panel closes a shutoff valve that shuts off a pipe for supplying carbon dioxide from the fire extinguishing cylinder to each of the protection compartments. Then, the control panel receives the input to the emergency stop switch only after the fire extinguishing activity is started, and closes the shutoff valve.

[0008]

[Action] By gradually releasing carbon dioxide, even if there is a person in the protected area, the concentration of carbon dioxide will gradually increase, so it is possible to evacuate or seek rescue before reaching a lethal dose. Is. Then, for a sufficient time for evacuation, for example, after the carbon dioxide concentration rises to reach a breathable concentration, it is released all at once and the fire is sufficiently suppressed.

Further, since an emergency stop switch for stopping the emission of carbon dioxide from the protective compartment is provided, even if there is no person on the control panel provided in the disaster prevention center or the person does not notice it, Carbon dioxide emissions can be stopped from within the protected compartment.

[0010]

EXAMPLES An example of the present invention will be described below.
FIG. 1 schematically shows an embodiment of a carbon dioxide fire extinguishing facility using the present invention.

In the building 1, there are protective compartments 11, 21, 31 that can be used for the present facility and can be sealed.
1 and 31 have heads 121, 122, 123, 221, 222, and 32 for releasing the required number of carbon dioxide, respectively.
In addition, heat and smoke connected to the fire receiver 2 through its own signal line as automatic fire alarm equipment,
Fire detectors 131, 132, 2 that detect flames, odors, etc.
3, 33 are provided.

In addition, a concentration sensor is installed in each of the protective compartments 11, 21, and 31 at an appropriate height for detecting the amount of carbon dioxide released directly or indirectly from the oxygen concentration, for example, a height of about 80 cm. Emergency stop switch 1 that can stop emission of 14, 24, 34 and carbon dioxide manually
5, 25, and 35 are provided.

The amount of carbon dioxide required for fire extinguishing activities is preset in each of the protective compartments 11, 21, 31 of the building 1, and in this embodiment, the compartment 11 has four extinguishing cylinders to be described later. The partition 21 has three lines and the partition 31 has one line. That is, when releasing carbon dioxide, the control panel 3 uses four fire extinguishing cylinders in the case of the section 11 and the section 21.
In the case of, the control is performed so that three fire extinguishing cylinders are opened, and in the case of the section 31, one fire extinguishing cylinder is opened and discharged to each section.

The control panel 3 includes the protection sections 11, 21, 31.
Control valves 16 and 26 of the pressure release type provided in the pipe to
36 electrically controlled pilot valves 17, 27, 37 are selectively opened to control the carbon dioxide emission destination, and
The fire extinguishing cylinders 41, 42, 43, 44, 45, 46 filled with carbon dioxide as a fire extinguishing agent are individually opened by the opening control of the electric starting pilot valves 52, 53, 54, 55, 56. The amount of carbon dioxide released can be controlled. Each of these pilot valves 52, 5
3, 54, 55, 56 are electrically controlled via signal lines, and are automatically performed based on the signal of the receiver 2.

The operation of this embodiment will be described. For example, when a fire occurs in the protection section 11, the detector 13
1, 132 detects a fire and sends a signal to the receiver 2. Receiving the fire signal, the receiver 2 recognizes that a fire has occurred in the protection section 11 and sends a notification signal to that effect to the control panel 3.

Upon receiving the transfer signal, the control panel 3 opens the control pilot valve 17 and activates the starting solenoid 61 that electrically opens the starting cylinder 6 by a small pressurized nitrogen or the like to activate the starting cylinder. Release 6 The fire extinguishing cylinders 41, 42, 43, 44, 45 and 46 are controlled to be opened by releasing pressure from a sealing plate or the like. Release under pressure.

The carbon dioxide in the fire extinguishing cylinder 41 pressurizes the pipe to pressurize the piston in the cylinder (not shown) of the control valve 16 of the control pilot valve 17, which is opened, and the valve body is opened by so-called pressurization. Is released and passes through the control valve 16 to be discharged into the protective compartment 11 from each head 121, 122, 123.

Since only one carbon dioxide from the fire extinguishing cylinder 41 is released in the protective compartment 11, its concentration does not immediately increase. The concentration of carbon dioxide is indirectly detected by the concentration sensor 15 measuring the oxygen concentration, and when it reaches a predetermined level, the concentration sensor 15 outputs a signal to the control panel 3 to control the concentration. Since the panel 3 emits carbon dioxide in an amount necessary for extinguishing the fire in the protective compartment 11,
The startup pilot valves 52, 53, 54 are sequentially opened, and the fire extinguishing cylinders 42, 43, 44 are sequentially opened under pressure similarly to the cylinder 41.

When the carbon dioxide equivalent to four fire extinguishing cylinders is released, the protective compartment 11 becomes oxygen-deficient enough for extinguishing the fire, and the purpose of the fire extinguishing activity can be achieved.

If workers are left in the protective compartment 11, the worker himself or herself will be alerted by the start of carbon dioxide emission, or the control panel 3 will be provided by a monitoring camera or telephone communication. A supervisor such as a center notices the danger of the worker. Then, the operator operates the emergency stop switch 15 or the supervisor inputs the stop signal directly to the control panel 3. Emergency stop switch 1 in this protective compartment
Due to the presence of 5, the remaining workers can perform an emergency stop of carbon dioxide emission by themselves, and can be made a safe carbon dioxide fire extinguishing facility.

According to the input of the emergency stop switch 15 or the stop input of the board surface, the control board 3 performs an emergency stop operation of carbon dioxide emission. That is, by opening the shut-off pilot valve 71 of the so-called pressure-closed shut-off valve 7 that shuts off the pipe for supplying carbon dioxide from the fire extinguishing cylinder to each protection compartment,
The valve body of the shutoff valve 7 is closed by the pressure in the pipe, and at the same time, the stop pilot valve 82 for preventing the fire cylinder from further opening and the exhaust pressure pilot valve 81 for releasing the pressure in the thin tube are opened. To do. As a result, the protection section 1
Since the concentration of carbon dioxide in 1 does not rise further and is low at the initial stage of release, the workers left behind can safely evacuate from the protection zone 11. This operation may be performed either by shutting off the piping system for supplying carbon dioxide or stopping the opening of the cylinder, but it is preferable to perform both operations because it affects human life.

If the operation of the emergency stop switches 15, 25, 35 of the protective compartments 11, 21, 31 is always effective, the shut-off valve 7 may be operated at the time of carbon dioxide releasing operation by an operation before a fire due to mischief or the like. There may be a problem that is closed. Therefore, the emergency stop switches 15, 25,
The input of 35 should be accepted only after the fire fighting activity of the control panel 3 is started. And the emergency stop switch 15,
The positions of 25 and 35 are preferably displayed for easy understanding, but may be displayed only at the time of discharging by turning on a lamp at the start of the discharging operation.

Further, when a fire occurs from the protection section 31, the detector 33 detects the fire and sends a signal to the receiver 2. The receiver 2 receiving the fire signal is
It recognizes that a fire has occurred and sends a notification signal to that effect to the control panel 3.

Upon receipt of the transfer signal, the control panel 3 operates the starting solenoid 61 for opening the starting cylinder 6 to open the starting cylinder 6, and the pressure thereof releases the fire extinguishing cylinder 41. Then, in the case of the protection section 11, the control valve for releasing carbon dioxide to the target protection section was opened, but in this case, the bypass valve 361 is opened before opening the control valve 36.

The opening of this bypass valve is the opening of the bypass pipeline 362 using a thin tube or the like for controlling the amount of carbon dioxide released to the protective compartment 31. That is, protection section 3
In No. 1, sufficient fire-extinguishing activities can be performed only by opening the fire extinguishing cylinder 41 in a small section, and the amount of discharge cannot be limited by the number of open cylinders. Therefore, the flow rate is limited by the bypass line 362 so that the concentration of carbon dioxide in the protection section 31 does not rise sharply.

The carbon dioxide in the fire extinguishing cylinder 41 is discharged from the head 32 into the protective compartment 31 through the bypass valve 361, although the control valve 36 does not open.

In the protective compartment 31, as in the protective compartment 11, the concentration sensor 35 detects the degree of increase in the carbon dioxide concentration, and when it reaches a predetermined level, the concentration sensor 3
5 outputs a signal to the control panel 3, and the control panel 3 receives the protection section 3
In order to release the amount of carbon dioxide necessary for extinguishing fire No. 1, the control pilot valve 37 is opened, and the control valve 36 is pressurized and released to release sufficient carbon dioxide. Then, the protective compartment 31 is in an oxygen-deficient state sufficient for extinguishing the fire, and the purpose of the fire extinguishing activity is achieved.

Here, assuming that the worker remains in the protective compartment 31, the person himself or a supervisor such as a disaster prevention center notices the danger of the worker and the emergency stop switch 35 is turned on, as in the protective compartment 11. A stop input is directly input to the control panel 3 by an operation person or an observer, and the control panel 3 operates the above-mentioned emergency stop operation of carbon dioxide emission, that is, a piping system for supplying carbon dioxide from the fire extinguishing cylinder to each protection compartment. The shut-off pilot valve 71 of the pressure-closed shut-off valve 7 for shutting off is opened, and the shut-off valve 7 is shut off by the pressure in the pipe.

In the present embodiment, the release of the delayed release means for limiting the release amount of carbon dioxide is performed according to the output of the concentration sensor provided in each protection section, but the control panel 3 is provided with the timer means. It may be released depending on the duration of the release by the delayed release means, or manual input may be used. Further, although the passage restraint means using the bypass valve 361 is used only in the protection section 31, it can be used in other sections as well, and the opening to the protection section 31 is prohibited by changing the size of the fire extinguishing cylinder. It is also possible to use means. And it is also possible to combine both. In this way, since the delayed release means is provided, the delay timer at the time of startup is omitted in the carbon dioxide fire extinguishing equipment of this embodiment.

Further, the opening control of the fire extinguishing cylinder may be controlled not by the above-mentioned one by one but by one starting pilot valve as long as it does not affect the delayed release means. If it is large, multiple control is easy.

Here, the control panel 3 of the present embodiment is program-controlled by utilizing a storage means such as a microprocessor, ROM, RAM, etc., and six fire extinguishing cylinders 41, 42 arranged side by side. , 43, 44, 45, 46 are controlled to be opened from the fire extinguishing cylinder 41 side.
It is a memory of used fire extinguishing cylinders. Then, for example, the fire extinguishing cylinder 4 is completed after the fire extinguishing activity in the protection section 21 is completed.
When flying sparks have occurred in the protective compartment 31 when 1, 42, 43 have been used, the fire extinguishing cylinder 44 is controlled to be opened. Therefore, although not shown, the starting means can be used a plurality of times by connecting a plurality of starting cylinders or the like.

Furthermore, the fact that the number of fire extinguishing cylinders that is greater than four, which is the number of cylinders used in the maximum protection compartment, is arranged is reliable even if the number of fire extinguishing cylinders that can be used decreases due to erroneous discharge or the like. The purpose is to be able to carry out fire-fighting activities, and having a spare fire-fighting cylinder in this way has the effect of being able to carry out effective fire-fighting activities even if there is an accidental discharge or another fire.

[0033]

As described above, according to the present invention, since the delayed release means for limiting the amount of gas released is provided, by gradually releasing carbon dioxide, even if someone is in the protected area, As the carbon dioxide concentration rises gradually, it is possible to evacuate or seek rescue before the lethal dose is reached. The delayed release means is a means for prohibiting the opening of one or more carbon dioxide cylinders out of the required number of carbon dioxide cylinders in the protected compartment where the fire is occurring, or piping to the protected compartment where the fire is occurring. After a predetermined time has elapsed from the start of gas release or when the gas concentration reaches a predetermined level, the delayed release means is released and the carbon dioxide concentration rises. Shall be released all at once to sufficiently suppress fire.

Further, since the emergency stop switch for stopping the emission of carbon dioxide from the protective compartment is provided, it is possible to stop the emission of carbon dioxide from the protective compartment.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a carbon dioxide fire extinguishing facility using the present invention.

[Explanation of symbols]

11, 21, 31 protective compartment 14, 24, 34 Concentration sensor 15, 25, 35 Emergency stop switch 3 control panel 361 bypass pilot valve 41, 42, 43, 44, 45, 46 Fire extinguisher cylinders 52, 53, 54, 55, 56 Start pilot valve 7 Shut-off valve 81 Exhaust pressure pilot valve 82 Stop pilot valve

Claims (4)

(57) [Claims] 1. A carbon dioxide fire extinguishing system of the type that discharges the entire area to a protected area, is provided with a delayed release means for limiting the amount of carbon dioxide released, and the delayed release means is provided in the protected area where a fire is occurring. An opening prohibition means for prohibiting the opening of one or more carbon dioxide cylinders out of the required number of carbon dioxide cylinders, or a passage restraint means for limiting the amount of carbon dioxide passage through the pipe to the protected area where the fire is occurring, Carbon dioxide fire extinguishing equipment characterized by being either. 2. The delayed release means is activated at the same time as the release of carbon dioxide and outputs a signal according to the passage of a timer for counting a predetermined time, or a gas concentration meter provided in the protection section detects a predetermined concentration of a specific gas. The carbon dioxide fire extinguishing equipment according to claim 1, which is released based on any one of the signals. 3. A required number of carbon dioxide emission heads are provided for each protected area of the building, and a control panel is provided.
While opening the necessary fire extinguishing cylinders, selectively opening each control valve provided in the pipe to each of the protective compartments to control the release destination of carbon dioxide, in each of the protective compartments An emergency stop switch is provided, and according to the input of the emergency stop switch, the control panel closes a shutoff valve that shuts off a pipe for supplying carbon dioxide from the fire extinguishing cylinder to each of the protection compartments. Fire extinguishing equipment. 4. The carbon dioxide fire extinguishing equipment according to claim 3, wherein the control panel receives the input to the emergency stop switch only after the fire extinguishing activity has started and closes the shutoff valve.