JPH1015109A - Display for gas fire extinguishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the proper safety of a treatment work after putting out a fire by applying the constitution that an indicator lamp for showing the prophibition of access during the release of fire extinguishing gas is kept lit, unless gas concentration in a room drops to or below the prescribed level even after the end of the release of the fire extinguishing gas, regarding a gas fire extinguishing device to use carbon dioxide as fire extinguishing gas. SOLUTION: When a fire breaks out and the operation switch of a control panel 5 is operated, the control panel 5 generates the prescribed evacuation alarm and, then, outputs a control signal to a startup device 7. The valve of a gas cylinder 6 is opened on the operation of the startup device 7 and carbon dioxide gas in the gas cylinder 6 is released to a room 10 through piping 9 and a nozzle 8. In this case, a pressure switch 2 at the intermediate part of the piping 9 and a gas detector 1 provided in the room 10 respectively output the discharge pressure detection signal of the carbon dioxide gas and a gas detection signal to the control panel 5. The control panel 5, upon receipt of the discharge pressure detection signal, turns on an indicator lamp 3 for showing the prohibition of access, and turns off the indicator lamp 3, upon the disappearance of the gas detection signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a gas fire extinguisher, which is provided in a fire extinguisher that emits carbon dioxide gas or the like into a room to extinguish a fire, and displays an entry prohibition when the gas is released.

[0002]

2. Description of the Related Art Conventionally, a carbon dioxide fire extinguisher has been installed in a room provided with electrical equipment, a computer, and the like in which a water-based fire extinguishing agent cannot be used. And if you emit carbon dioxide for fire fighting, there is a danger of suffocation in the room,
Before the release of carbon dioxide gas, a warning is issued by a sound and an indicator light so as to evacuate the room. In addition, an indicator light attached near the door of the room is turned on to display a message such as "no danger", thereby preventing entry into the room.

[0003]

An indicator light provided near a door of a room equipped with a carbon dioxide fire extinguishing device is a pressure switch for detecting a carbon dioxide gas release pressure as shown in FIGS. Lights in conjunction with. Therefore, when the release of the carbon dioxide gas is completed, the display of “dangerous entry prohibited” is erased. Even when the display of “dangerous entry prohibited” is not displayed, if the user enters the room immediately after the end of carbon dioxide emission, the carbon dioxide gas may still be full, which is dangerous. In addition, when performing the treatment after the fire extinguishing, it is necessary to wait until the time when the carbon dioxide gas concentration is considered to be sufficiently reduced.

[0004]

A display device for a gas fire extinguisher according to the present invention discharges a fire extinguishing gas into a room based on a manual control input, and displays an entry prohibition near the door of the room when the fire extinguishing gas is released. In a display device of a gas fire extinguishing device, a pressure switch for detecting the release of a fire extinguishing gas, a gas detector for detecting a gas concentration equal to or higher than a predetermined value in a room, and a self-holding lighting control signal based on the detection signal of the pressure switch And a self-holding circuit for releasing the holding of the output of the lighting control signal when the detection signal of the gas detector is restored from the gas detection state, and an indicator light for lighting and displaying by the output of the self-holding circuit. It is characterized by having done.

[0005]

FIG. 1 is an overall configuration diagram showing a specific example of a display device of a gas fire extinguisher according to the present invention. The fire extinguisher includes a control panel 5 for performing start control of gas release, a gas cylinder 6 in which carbon dioxide is stored, an activation device 7 for starting release of carbon dioxide gas by a control signal from the control panel 5, and a gas cylinder 6. A nozzle 8 for discharging a fire extinguishing gas into a chamber 10 via a starting device 7 and a pipe 9; a pressure switch 2 for detecting the release of the fire extinguishing gas from the internal pressure of the pipe 9; A gas detector 1 that outputs a detection signal to the control panel 5 at the time of (1), and an indicator light 3 that is controlled to be turned on by a control signal from the control panel 5 and that indicates that entry is prohibited.

When an operation switch of the control panel 5 is operated when a fire occurs, the control panel 5 outputs a control signal to the activation device 7 after giving a predetermined evacuation warning. The activation device 7 to which the control signal is applied opens the valve of the gas cylinder 6. The carbon dioxide gas stored in the gas cylinder 6 is supplied through a pipe 9 and a nozzle 8 to a chamber 10.
Discharge inside and extinguish fire. The pressure switch 2 provided in the middle of the pipe 9 detects the release pressure of carbon dioxide gas and outputs a detection signal to the control panel 5. The gas detector 1 outputs a gas detection signal to the control panel 5 when the concentration of carbon dioxide in the chamber 10 reaches a predetermined value.

The control panel 5 turns on the display lamp 3 at the same time as the detection signal is input from the pressure switch 2 to indicate that entry is prohibited, and outputs a gas detection signal from the gas detector 1. The indicator lamp 3 is turned off when there is no more. That is, the indicator lamp 3 is turned on when gas release is started, and is turned off when the concentration of carbon dioxide gas becomes lower than a predetermined value. To release.

The display control device in the control panel 5 of the indicator light 3 has a configuration as shown in the block diagram of FIG. The detection signal from the pressure switch 2 and the detection signal from the gas detector 1 are inputted, and the self-holding circuit 4 for controlling lighting of the indicator lamp 3 is provided. Self-holding circuit 4
As shown in the timing chart of FIG. 3, when the pressure detection signal from the pressure switch 2 is output, the signal for self-holding and outputting the signal for turning on the indicator lamp 3 is output. Is output once, the self-holding state is released and the indicator lamp 3 is turned off when the gas concentration decreases and the gas detection signal decreases after the end of the fire extinguishing.

FIG. 4 shows a specific circuit configuration of the self-holding circuit 4. The self-holding circuit 4 is energized by a detection operation signal (ON signal) of the gas detector 1 and energized by a relay RY provided with a switching contact ry1 and a detection operation signal (ON signal) of the pressure switch 2, A relay RX having a switching contact rx1, and a power supply or switching contacts ry1, r
x1 is set and reset at the time of switching, latching relay RH having two normally open contacts rh1 and rh2
And a transistor TR for driving a latching relay RH
1, TR2, TR3, respectively connected to the power supply and connected to the bases of the transistors TR1, TR2, TR3, respectively, resistors R1 to R3, capacitors C1 to C3, resistor R4
To R6, and the contacts rh1 and rh2
Of the relay RR provided with the normally open contact rr1, diodes D2 to D6 connected in parallel to the respective relay coils to absorb the back electromotive force, a diode D1 for backflow prevention, and an indicator lamp 3. And a fuse FU connected to the control power line.

The operation of the self-holding circuit 4 configured as described above will be described. Normally, a predetermined DC power is applied to the power terminals PD and ND. When the power is turned on, the resistor R1,
A charging current flows through a series circuit including the capacitor C1 and the resistor R4 and a series circuit including the resistor R2, the capacitor C2, and the resistor R5. This charging current causes the transistor T
A base current flows through R1 and TR2, and is temporarily turned on. When the transistor TR1 or TR2 is turned on, the latching relay RH is reset and the contact rh
1, rh2 is in a standby state in an open state.

When the fire extinguishing gas is released by operating the control panel 5, the pressure switch 2 detects the gas pressure and turns on the output. A current flows through the relay RX and the contact r
By switching x1 to the A side, the connection point between the resistor R3 and the capacitor C3 is disconnected from the negative side of the power supply. Resistance R
3, a charging current flows in a series circuit including the capacitor C3 and the resistor R6, the transistor TR3 is turned on, the latching relay RH operates, and the contacts rh1 and rh2 are closed. Further, since the connection point between the resistor R1 and the capacitor C1 is connected to the negative side of the power supply, the electric charge charged in the capacitor C1 is discharged.

When the latching relay RH operates and the contact rh
When 1 and rh2 are closed, a current flows through the coil of the relay RR to be in an energized state, the contact rr1 is closed, and power is supplied to the indicator lamp 3 to indicate that entry is prohibited.

When the fire extinguishing gas is released and the gas concentration in the chamber 10 exceeds a predetermined value, the gas detector 1 outputs a detection signal (ON). When the gas detector 1 performs the detecting operation, the relay RY is energized, and the switching contact ry1 switches to the A side. Switching contact r
When y1 is switched, the connection point of the resistor R2 and the capacitor C2 is connected to the negative side of the power supply to discharge the charge stored in the capacitor C2. Further, since the connection point between the resistor R1 and the capacitor C1 is suppressed to zero potential of the power supply via the diode D1, no charging current flows through the capacitor C1. Accordingly, since the transistors TR1 and TR2 are not turned on, the latching relay RH does not change.

When the extinguishing of the fire extinguishing gas is completed, the pressure switch 2 is turned off and the relay RX is turned off. Although the switching contact rx1 of the relay RX switches to the B side, the state of the latching relay RH does not change because the switching contact ry1 remains at the A side.

After the release of the fire extinguishing gas, when the concentration of the extinguishing gas in the chamber 10 decreases to a level lower than a predetermined concentration and the detection signal from the gas detector 1 disappears (OFF state), the relay RY is deactivated. The switching contact ry1 switches to the original B side.
A charging current flows through the capacitors C1 and C2 via the resistors R1 and R2.
Reference numeral 2 temporarily turns on and sets the latching relay RH to an initial state. Contacts rh1, r of latching relay RH
h2 is open, the relay RR is de-energized, and the contact rr1
To turn off the indicator light 3.

As described above, the self-holding circuit 4 turns on the indicator lamp 3 when the pressure switch 2 performs the detecting operation to display the entry prohibition, and thereafter, when the concentration of the extinguishing gas becomes higher than a predetermined value, the gas detector 1 Is controlled to turn off the indicator lamp 3 when the concentration of the extinguishing gas becomes lower than a predetermined value after the extinguishing operation.

[0017]

As described above, the display device of the gas fire extinguisher according to the present invention is a gas fire extinguisher that uses carbon dioxide as a fire extinguishing gas. The indicator light provided near the door to be operated continues to be lit even when the gas concentration in the room does not become lower than the specified value even after the extinguishing of the fire extinguishing gas, so the fire extinguishing gas is still full after extinguishing. It is possible to prevent the user from entering the room and wait for the indicator lamp to be turned off, and immediately start processing after the fire is extinguished.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of a display device of a gas fire extinguisher according to the present invention.

FIG. 2 is a view showing a specific example of a display device of the gas fire extinguisher according to the present invention.

FIG. 3 is a timing chart for explaining the operation of FIG. 2;

FIG. 4 is a circuit diagram showing a specific example of the self-holding circuit of FIG. 2;

FIG. 5 is a diagram showing a specific example of a display device of a conventional gas fire extinguisher.

FIG. 6 is a timing chart illustrating the operation of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas detector 2 Pressure switch 3 Indicator 4 Self-holding circuit 5 Control panel 6 Gas cylinder 7 Starting device 8 Nozzle 9 Piping 10 Room

Claims (1)

[Claims] A fire extinguishing gas is released into a room based on a manual control input, and the display of the gas fire extinguishing device that displays a prohibition of entry near a door of the room when the fire extinguishing gas is released detects the release of the fire extinguishing gas. A pressure switch, a gas detector for detecting a gas concentration equal to or higher than a predetermined value in the room, and a self-holding light-up control signal according to the detection signal of the pressure switch to output a lighting control signal. A display device for a gas fire extinguisher, comprising: a self-holding circuit for releasing the holding of the output of the lighting control signal upon recovery; and an indicator lamp for lighting and displaying the output by the output of the self-holding circuit.