JP3113206B2 - Failure indication method for automatic 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 method for simultaneously extinguishing a series of fires generated in a place such as a kitchen range, a fryer for tempura, a hood, a duct, and the like by a plurality of fire extinguishing systems. Automatic fire extinguishing equipment of the interlocking type and automatic fire extinguisher with multiple rooms such as condominiums as fire extinguishing areas, in particular, using a thermistor whose electrical resistance changes due to temperature changes, catch the changed resistance value and activate the fire extinguishing equipment For the improvement of automatic fire extinguishing equipment equipped with one or more sensors as described above, the occurrence of a failure in an electric circuit such as a disconnection or a short circuit (short circuit) is automatically detected in advance, and inspection and maintenance is promoted. An object of the present invention is to ensure reliable operation and to prevent adverse effects caused by a malfunction of a starting device of a fire extinguishing system.

[0002]

2. Description of the Related Art The most advanced fire extinguishing equipment for kitchens is equipped with a fire extinguishing agent injection nozzle for each part such as a fryer for a range, a tempura, a hood, a duct, etc., and near the entrance of the duct. Is equipped with a fire detector, and in apartments, factories and offices,
A fire extinguishing agent injection nozzle and a fire detector directed to each fire extinguishing area, and a device that sends the fire extinguishing agent to the fire occurrence point when the fire detector detects a fire are provided. Most of them use a thermistor whose electrical resistance changes due to temperature change, and constitute automatic fire extinguishing equipment equipped with one or more sensors that catch the changed resistance value and activate the fire extinguishing equipment It has increased.

[0003]

However, the above-mentioned conventional automatic fire extinguishing equipment uses a sensor in which the resistance of the thermistor changes with the occurrence of a fire to start the fire extinguishing equipment. Since the fire detection is electrically communicated to the fire extinguishing equipment activation means, accidental disconnection of electrical wiring during telephone or electrical work or other construction work that is not directly related to the fire extinguishing equipment, In many cases, an abnormality such as disconnection or short-circuit occurs in a long electric wiring from a fire detector to an electric control unit for starting a fire extinguishing facility, such as a cut or short-circuit of a prepared electric wiring.

If the electric wiring between the sensor and the fire control equipment start-up electric control unit or between the fire control equipment start-up electric control unit and the start-up unit is broken, the control unit is activated when a fire occurs. It goes without saying that the automatic fire extinguisher cannot be started even if the start signal (current) flows, which greatly increases the damage and makes it unnecessary to install the automatic fire extinguisher.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention solves the above-mentioned various problems in the prior art, uses a thermistor whose electric resistance changes with a temperature change, catches the changed resistance value, and extinguishes the fire. In an automatic fire extinguisher equipped with one or more detectors for starting the equipment, a disconnection or short circuit (short circuit) of electrical wiring is automatically detected, and this is visually or audibly indicated by an indicator light. Specifically, a sensor is used to display an auditory display, and specifically, uses a thermistor whose electric resistance changes according to a temperature change, and detects the changed resistance value to activate a fire extinguishing system. Or, in an automatic fire extinguishing facility including two or more, in a resistance change in an electric wiring from a sensor to an electric control unit, a time when the resistance value is equal to or less than a resistance value determined to be a fire is instantaneous. In case, to failure display method in an automatic extinguishing systems, characterized in that a display means indicating that the electrically shorted between the sensor and extinguishing equipment startup electrical control unit.

[0006]

[0007]

Further, the present invention relates to an automatic fire extinguishing system including one or two or more sensors which use a thermistor whose electric resistance changes according to a temperature change and catch the changed resistance value to activate the fire extinguishing system. In the case of a change in resistance in the electrical wiring from the sensor to the electrical control unit, when the time to reach a resistance value or less that is determined to be a fire is instantaneous, an electrical connection is established between the sensor and the electrical control unit for starting the fire extinguishing equipment. The present invention also relates to a failure occurrence display method in automatic fire extinguishing equipment, wherein a display means for indicating that a short circuit has occurred is provided, and the electric control unit for starting fire extinguishing equipment is not activated.

Further, the present invention relates to an automatic fire extinguishing system having one or two or more sensors which use a thermistor whose electric resistance changes according to a temperature change and catch the changed resistance value to activate the fire extinguishing system. When the resistance of the electric wiring from the detector to the electric control unit has reached a resistance value of minus 30 degrees or more, if the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is broken. Judgment and display means to indicate the disconnection, and in the resistance change in the electrical wiring from the sensor to the electrical control unit, when the time to reach the resistance value or less that is determined to be a fire is instantaneous, to start the sensor and fire extinguishing equipment The present invention also relates to a failure occurrence display method in automatic fire extinguishing equipment, wherein a display means for indicating that an electric short is present between the electric control unit and the electric control unit.

Further, the present invention relates to an automatic fire extinguishing system including one or two or more sensors which use a thermistor whose electric resistance changes according to a temperature change and catch the changed resistance value to activate the fire extinguishing system. When the resistance of the electric wiring from the detector to the electric control unit has reached a resistance value of minus 30 degrees or more, if the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is broken. Judgment and display means to indicate the disconnection, and in the resistance change in the electrical wiring from the sensor to the electrical control unit, when the time to reach the resistance value or less that is determined to be a fire is instantaneous, to start the sensor and fire extinguishing equipment A display means for indicating that an electric short is present between the electric control unit and the display means; and both display means use an indicator light and blink or continuously light the indicator light. Ri also relates to a failure display method in an automatic extinguishing systems, characterized in that the to be able to display distinguishes between disconnection and short by one display means.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, a case where the specific contents of the present invention are applied to a fire extinguisher for a kitchen shown in FIG. 1 will be described. 1 is a range stand, and 4 is a hood installed on a range stand 1. 5 is a duct installed from the hood 4 to the outside, 6 is one or two or more fire detectors installed inside the hood 4 near the entrance of the duct 5, 8.11 is installed in the hood 4 The fire extinguishing agent spray nozzles 12.12 'directed to the fryer 2 and the cooking pan 3 on the stove 1 where they are installed are located throughout the hood 4 also installed in the hood 4. The directed fire extinguishing agent injection nozzle, 13 denotes a fire extinguishing agent injection nozzle installed in the duct 5, and the nozzle 8 is connected to the first through a pipe 14.
Fire extinguisher 7, nozzle 11 via pipe 15 to second fire extinguisher 9, nozzles 12 and 12 ′ via pipe 16.17.18 and nozzle 13 via pipe 1
Each is connected to the third fire extinguisher 10 via 9.18.

The above-mentioned fire detector 6 uses a thermistor whose electric resistance changes according to a temperature change, detects the changed resistance value, and starts a fire extinguishing system. In the case where a plurality of units 6 are installed, if any one of them reaches a certain or higher temperature, the fire extinguishing system is activated via a control unit described later. 20
Represents an operation panel, which is not particularly shown in the operation panel 20, but in addition to a power supply display section, a disconnection display section, a device operation display section, a gas cutoff display section, a caution alarm display section, a manual start push button, A reset switch and alarm buzzer are installed.

Although not shown in FIG. 1,
As shown in FIG. 2, each fire extinguishing device 7.9.10 operates in response to a fire occurrence signal from the fire detector 6, and operates via a relay (not shown) or the like. 21 for issuing a signal for activating the activation unit and the like
Triggered by an electrical control output signal from the control unit 21 to ignite the detonator, or to break it by pressing a sharp-edged cutter against the sealing plate of the fire extinguisher, using a solenoid. Activating unit 22 for feeding the filled fire extinguishing agent into the fire extinguishing target area
Is provided.

The control unit 21 is further provided with a gas shut-off unit 23 and a relay output unit 24. In the automatic fire extinguishing system for a kitchen shown in FIG. Even if a fire starts from a location, the fire detector 6 emits a fire from the place where the fire extinguishing agent is not effective unless the fire extinguishing agent is radiated to the entire kitchen in order to spread the oil and fats attached to the hood 4 and the duct 5 immediately. In response to the generated signal, the control unit 21 first reads the temperature data. When the temperature reaches a specified temperature, the control unit 21 operates in the order of a caution alarm → gas shutoff → activation of the automatic fire extinguishing device.

If the electrical wiring from the fire detector 6 to the fire extinguishing facility starting electric control unit 21 is broken, the resistance becomes infinite, but the thermistor used in the fire detector 6 3 decreases at high temperatures and increases at low temperatures as shown in FIG.
When it reaches ° C, it exceeds 1000 KΩ.

As a specific criterion, as shown in FIG. 5, in the electric circuit resistance of the fire detector 6, when the resistance state of -30 ° C. or less continues for 2 seconds, the fire detector 6 switches off the fire extinguishing equipment. It is determined that a break has occurred in the electric wiring leading to the start-up electric control unit 21, and this is indicated by blinking the abnormality indicator lamp 27 via the microcomputer in the control unit 21 to indicate that the break has occurred. Let it. In this case, a weak current is always conducted to the electric circuit between the fire extinguishing facility starting electric control unit 21 and the fire extinguishing facility starting unit 22, and if not, the electric circuit is disconnected. Abnormality indicator light 27 described above
May be blinked.

In an actual fire scene, no matter how intense the fire is, it takes at least one second for the temperature detected by the thermistor of the fire detector 6 to reach 200 ° C. from room temperature. It is clear above. Therefore, in the thermistor of the fire detector 6,
If the time required to reach the electric resistance sufficient to activate the fire extinguishing equipment is instantaneous within one second, it is not the occurrence of a fire, but rather between the fire detector 6 and the electric control unit 21 for extinguishing the fire extinguishing equipment. It can be regarded as an electrical short-circuit. In this case, as a display means indicating the short-circuit, the abnormality indicator light 27 is turned on to prompt the inspection of the automatic fire extinguishing device itself. I do. In this case, in addition to turning on the abnormality indicator lamp 27, it is possible to prevent the fire extinguishing device 7.9.10 from being started by providing a microcomputer in the fire extinguishing facility starting electric control unit 21.

A display means for indicating that the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is broken; and a time required for the electric sensor to reach an electric resistance sufficient to start the fire extinguishing equipment. However, when the time is within 1 second, the display means indicating that there is an electrical short circuit between the detector and the fire extinguishing facility activation electric control unit,
Either one or both of them may be provided, and in this case, both display means use an indicator light, and the indicator light blinks or lights continuously to provide one display means. The disconnection and the short can be displayed separately.

Next, the operation steps of the automatic fire extinguisher according to the present invention will be described in detail with reference to the operation flow of FIG. 4 focusing on the apparatus of the embodiment of FIGS. When one or two or more fire detectors 6 attached to the hood 4 or the duct 5 are constantly monitoring the occurrence of a fire, the power indicator 26 is constantly lit. In this case, when the resistance of the electric circuit resistance of the fire detector 6 is lower than −30 ° C. for 2 seconds, the abnormality indicator lamp 27 starts blinking and the fire detector 6 is turned off.
It is displayed that the electric wiring from the power supply to the fire extinguishing facility starting electric control unit 21 is disconnected. Further, in the electric circuit resistance of the fire detector 6, if the time required to reach the electric resistance sufficient to activate the fire extinguishing equipment is within one second, the abnormality indicator light 27 is turned on, and the fire detector is turned on. 6 and an electrical short circuit between the fire extinguishing facility activation electric control unit 21 is displayed.

[Caution alert] One of the fire detectors 6
When a temperature reaching 120 ° C. is sensed, the change is transmitted to the microcomputer in the control unit 21 by a specific change in electric resistance.
A signal is sent to the alarm device 28A to light the caution alarm indicator lamp and sound the alarm buzzer.

[Gas Shutdown] When the temperature of one of the fire detectors 6 further rises and the microcomputer in the control unit 21 reads the temperature data and reaches 160 ° C., the above-mentioned caution alarm is continued as it is. , Gas shut-off unit 23
Is set to "ON" to shut off the gas, and this is indicated by turning on the indicator lamp by the alarm device 28B.

[Operation of Device] When any one of the fire detectors 6 detects a high temperature exceeding 200 ° C., the control unit 2
The microcomputer in 1 detects this, and the alarm device 28C turns on the above-mentioned caution alarm indicator / gas shut-off indicator and the alarm buzzer, and additionally turns on the device operation indicator. With fire extinguisher 7.9.
10 and a relay output unit (2
00 ° C. transfer unit) 24 is turned on to start up, respectively, from the nozzle 8 of the first fire extinguisher 7 to the fryer 2, from the nozzle 11 of the second fire extinguisher 9 to the cooking pot 3, and further to the third fire extinguishing. The nozzle 13 and the nozzle 12 of the device 10
The fire extinguishing agent is radiated from 12 'into the duct 5 and the hood 4, respectively. If the fire is detected artificially before the fire detector 6 detects the high temperature reaching 200 ° C., the fire extinguisher can be started by pressing the manual start button 29.

Further, an alarm buzzer may be sounded when each fire extinguishing device 7.9.10. Further, in this case, a description has been given of a case where one nozzle is provided for each of the nozzles 8 and 11, but it is also possible to provide two nozzles and emit the light from each nozzle. In FIG. 2, reference numeral 25 denotes an emergency battery (24 VDC), and when the power supply of the control unit 21 is interrupted, stores an electric capacity enough to maintain the function of the control unit 21 for at least about 10 hours after the power interruption. When the power of the battery 25 is exhausted, the battery 25 can be successively charged when a normal power supply (100 V AC) is input.

As described above, in the automatic fire extinguisher according to the present invention, when the temperature of the fire detector 6 reaches a certain temperature or higher, the electric resistance of the thermistor changes. If the electric circuit resistance of the sensor 6 is lower than −30 ° C. for two seconds, the abnormality indicator lamp 27 starts blinking and the fire detector 6
It is displayed that the electric wiring from the power supply to the fire extinguishing facility starting electric control unit 21 is disconnected. In addition, when it is instantaneous until the electric resistance of the electric circuit resistance of the fire detector 6 reaches the electric resistance sufficient to activate the fire extinguishing equipment, the abnormality indicator light 27 is turned on to activate the fire detector 6 and the fire extinguishing equipment. The display indicates that there is an electrical short circuit with the electrical control unit 21 for use.

Further, when the thermistor of the fire detector 6 changes a specified electric resistance value, various alarms are issued via the control section 21 in the order of "caution alarm" → "gas shutoff" → "device operation". And fire the fire extinguishing system to radiate the fire extinguishing agent. In FIG. 4, reference numeral 30 denotes a reset switch, which can be returned to the initial monitoring state by depressing the switch in the gas shut-off stage, which is a stage before the operation of the device, and in the stage after the operation of the device. .

[0026]

According to the present invention, as described above, an automatic fire extinguishing system using a thermistor whose electric resistance changes according to a temperature change, and having one or more sensors for detecting the changed resistance value and activating the fire extinguishing equipment. In the equipment, in the resistance change in the electric wiring from the sensor to the electric control unit, if the time to reach a resistance value or less that is determined to be a fire is instantaneous, the sensor and the fire suppression equipment start-up electric control unit are connected. In the case where the display means for indicating that there is an electrical short-circuit between them is provided, the automatic fire extinguishing system always performs normal monitoring prior to the occurrence of a fire, similarly to the case where the above-described disconnection display means is provided. It is possible to check whether the state is in the state, and as a result, it is possible to avoid a shortage situation in which the fire extinguishing function does not operate when a fire occurs, and to prevent the adverse effect due to a malfunction in a non-fire situation.

[0027]

Further, in an automatic fire extinguishing system equipped with one or more sensors that use a thermistor whose electric resistance changes according to a temperature change and catch the changed resistance value to activate the fire extinguishing system, When the resistance of the electric wiring to the control unit reaches a resistance value of minus 30 degrees or more, a display indicating that the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is broken. Means,
In the case where the time required to reach the electrical resistance sufficient to activate the fire extinguishing equipment in the sensor is instantaneous, display means for indicating that there is an electrical short circuit between the sensor and the electric control unit for starting the fire extinguishing equipment. In addition, in the case where both display means use an indicator light, and the indicator light blinks or lights continuously, one display means can distinguish and display a disconnection and a short circuit. Can simplify the display means and reduce the cost.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an automatic fire extinguishing system for a kitchen according to one embodiment of the present invention.

FIG. 2 is a block diagram showing functions of specific main parts of the automatic fire extinguishing equipment for kitchen in FIG. 1;

FIG. 3 is a graph showing a relationship between a change in electric resistance of a thermistor and a temperature in a fire detector used in the present invention.

FIG. 4 is an operation flowchart of the automatic fire extinguisher according to the present invention.

FIG. 5 is an explanatory view showing a criterion for determining disconnection or short-circuit of electric wiring based on changes in the temperature and current value of the thermistor, mainly on the main part of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Range stand 2 Fryer 3 Cooking pot 4 Hood 5 Duct 6 Fire detector 7 First fire extinguisher 8 Nozzle 9 Second fire extinguisher 10 Third fire extinguisher 11 Nozzle 12 Nozzle 12 'Nozzle 13 Nozzle 14 Pipe 15 Pipe 16 Pipe 17 Pipe Reference Signs List 18 pipe 19 pipe 20 operation panel 21 control unit 22 starting unit 23 gas shut-off unit 24 relay output unit 25 battery 26 power indicator light 27 abnormality indicator light 28 alarm device 29 manual start button 30 reset switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A62C 35/00-35/68 A62C 37/00-37/50 G08B 17/00 G08B 17/06 G08B 29 / 06

Claims (4)

(57) [Claims] 1. An automatic fire extinguishing system comprising one or more sensors using a thermistor whose electric resistance changes according to a temperature change and detecting the changed resistance value to activate the fire extinguishing system. In the resistance change in the electric wiring to the electric control unit, if the time to reach the resistance value that is judged to be a fire or less is instantaneous, an electric short-circuit occurs between the sensor and the electric control unit for starting the fire extinguishing equipment. A failure occurrence display method in automatic fire extinguishing equipment, characterized by providing a display means for indicating that the failure has occurred. 2. An automatic fire extinguishing system comprising one or more sensors using a thermistor whose electric resistance changes according to a temperature change and detecting the changed resistance value to activate the fire extinguishing system. In the resistance change in the electric wiring to the electric control unit, if the time to reach the resistance value that is judged to be a fire or less is instantaneous, an electric short-circuit occurs between the sensor and the electric control unit for starting the fire extinguishing equipment. A failure occurrence display method for automatic fire extinguishing equipment, characterized by providing a display means for indicating that the fire extinguishing equipment is activated and not activating the electric control unit for starting fire extinguishing equipment. 3. An automatic fire extinguishing system including one or more sensors that use a thermistor whose electric resistance changes according to a temperature change and detect the changed resistance value to activate the fire extinguishing system. When the resistance of the electric wiring to the control unit reaches a resistance value of minus 30 degrees or more, it is determined that the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is disconnected, A display means indicating a disconnection and an electric control unit for activating a sensor and a fire extinguisher when the time to reach a resistance value or less that is determined to be a fire is instantaneous in a resistance change in electric wiring from the sensor to the electric control unit. A display means for indicating that there is an electric short circuit between the automatic fire extinguishing system and the failure occurrence display system. 4. An automatic fire extinguisher equipped with one or more sensors using a thermistor whose electric resistance changes according to a temperature change and catching the changed resistance value to activate the fire extinguishing equipment. When the resistance of the electric wiring to the control unit reaches a resistance value of minus 30 degrees or more, it is determined that the electric wiring from the sensor to the electric control unit for starting the fire extinguishing equipment is disconnected, A display means indicating a disconnection and an electric control unit for activating a sensor and a fire extinguisher when the time to reach a resistance value or less that is determined to be a fire is instantaneous in a resistance change in electric wiring from the sensor to the electric control unit. Display means for indicating that an electrical short is present between the display means and the display means. Failure display method in an automatic extinguishing systems, characterized in that the to be able to display distinguishes between disconnection and short by.