JP3926538B2 - Gas shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off device that monitors the usage state of a gas appliance that uses city gas, LP gas, or the like, and more particularly to a gas shut-off device that ensures safety when the power capacity of a battery power source is consumed.
[0002]
[Prior art]
A conventional gas shut-off device of this type has a configuration as disclosed in, for example, Japanese Patent Laid-Open No. 10-103546. FIG. 4 shows a block diagram of this gas shut-off device.
[0003]
In the gas shut-off device 21 of FIG. 4, reference numeral 22 denotes a battery power supply that supplies power to the entire gas shut-off device. Reference numeral 23 denotes a shut-off valve, which stops or supplies gas in the flow path. Reference numeral 24 denotes a voltage drop detection unit, which detects a consumed battery voltage in which the capacity of the battery power source 22 capable of operating the gas cutoff device 1 within a predetermined operation guarantee time is left, and outputs a voltage drop signal A. . 25 is an opening acceptance unit that accepts opening of the shut-off valve from the time when the voltage drop signal A is input, and opens when there is an opening request (opening request switch or input of an opening signal by communication). A stopper request signal C is output. A timer unit 26 counts a predetermined operation guarantee time from when the voltage drop signal A is input, and outputs a plug opening completion signal D. Reference numeral 27 denotes an opening function stop unit which outputs a closing stop signal E for stopping the opening according to the opening request signal C when the opening end signal D is input. Reference numeral 28 denotes a gas shut-off control unit which closes the shut-off valve 23 when the battery voltage drop signal A or the closure stop signal E is inputted, and when the opening request signal C is inputted before the input signal of the closure stop signal E. The shut-off valve 23 is opened.
[0004]
Next, the operation of the conventional configuration will be described. When the voltage drop detection unit 24 checking the degree of consumption of the battery power source 22 detects the battery consumption voltage, the voltage drop signal A is output to the unplug accepting unit 25, the timer unit 26, and the gas cutoff control unit 28. The gas cutoff control unit 28 to which the voltage drop signal A has been input outputs the first cutoff command signal B1 to operate the cutoff valve 23 and close the gas passage. When the voltage drop signal A is input, the timer unit 26 starts counting, and until the timer unit 26 finishes counting for a predetermined time, there is an opening request to the opening accepting unit 25, and the opening request signal C Is output, the gas cutoff control unit 28 opens the cutoff valve 23. When the timer section 26 finishes counting, the plug opening end signal D is output, so the plug opening function stop section 27 outputs the plug opening stop signal E and stops accepting the plug opening request. The gas cutoff device 21 to which the closing stop signal E is input outputs the second cutoff command signal B2 to close the cutoff valve 23.
[0005]
In the gas shut-off device 1 attached to a flow path through which a medium gas such as city gas or LP gas flows, the voltage drop detection unit 24 measures the voltage of the battery power source 22 at predetermined time intervals and monitors the degree of battery consumption. Yes. The lower limit voltage at which the gas shut-off device 21 can be operated is set in advance as the operation guarantee voltage, and the voltage value when the voltage is reversed for a required number of days from here is set as the battery consumption voltage. The voltage drop detection unit 24 monitors the battery voltage and detects the battery voltage when the battery is consumed. That is, after the battery consumption voltage is detected for the required number of days, the shutoff valve 23 can be opened only during the period when the voltage of the battery power supply 22 drops to the operation guarantee voltage, and a grace period is provided until the gas shutoff device 21 is replaced. Is.
[0006]
[Problems to be solved by the invention]
However, the conventional configuration has the following problems. The voltage drop detection unit 24 detects a battery voltage in a predetermined consumption state, outputs a voltage drop signal A, the timer unit 26 starts counting, and the gas cutoff control unit 28 drives the cutoff valve 23 to stop the gas supply. However, there are cases where consumers use gas appliances at this time, for example, there are cases where hot water boiled from a gas water heater is used for showers, etc. In addition, there is a problem that when cooking, cooking is not possible and the usability is poor.
[0007]
The present invention solves the above-mentioned problems, and when a gas consumer uses a gas appliance when a battery voltage drop state is detected, the gas is highly safe and reliable by improving usability while ensuring safety. The object is to provide a shut-off device.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a battery power supply means for supplying power, a flow rate detection means for detecting a gas flow rate, an external device means for detecting gas leakage, etc., and a shutoff for supplying and shutting off a gas medium. Means, a voltage detection means for monitoring the supply voltage of the battery power supply means, a voltage warning determination means for determining that an abnormality is detected when a voltage equal to or lower than a predetermined voltage is detected by the voltage detection means, and outputting a warning signal, and a predetermined voltage for the voltage detection means. A time measuring means for measuring a voltage or less for a predetermined time after detection, and determining whether or not the observation value detected by the flow rate detecting means is an abnormal usage amount, driving the shut-off valve at the time of abnormality determination, and gas by the external equipment means and abnormality determining means for driving the abnormality detection time of the blocking means such as leakage, and return means for said shut-off means for outputting a signal to return to the gas supply state, the return signal when a predetermined time has elapsed in the time measuring means An input inhibit perform blocking output to the blocking means, and prohibits the input of the subsequent return signal performs a blocking output to the blocking means when an abnormality is detected by said abnormality determination means during a predetermined time measured by the time measuring means Thus, it is configured to include a return prohibiting unit that holds the gas use prohibition state, and a notification unit that notifies when the battery warning is detected by the voltage warning unit or when an abnormality is detected by the abnormality determination unit .
[0009]
With the above structure, the supply voltage of the battery power source to start the time measurement by the time measuring means detects that the the predetermined voltage or lower by the voltage detection means, immediately the voltage abnormality determining means by the consumer as the battery voltage abnormality drop, or gas Since the operator is notified via the notification means to notify that the battery is in an abnormal state, when a gas appliance is used at the customer's house when the battery is detected, heating such as a gas stove during cooking or in winter Since gas supply is not stopped by shutting off etc. while using the equipment, gas customers can use gas appliances with peace of mind, and troubles such as forgetting to close the gas appliances can be prevented. In the time measurement means, the elapsed time after the battery is reduced is counted. If it is the use, stopping the gas supply by detecting blocking means optionally abnormality determination means it continues to use a long time gas appliance example incorrectly. That is, if the shut-off means is driven in a lowered state after the battery voltage drop is detected, it is dangerous to continue to safely monitor the usage state of the gas appliance by accelerating the voltage drop due to further consumption of the battery voltage. In order to prevent gas appliances from being used by mistake, the shut-off state is maintained by prohibiting return acceptance of the shut-off means for gas supply, so that safety and reliability are improved.
[0010]
In order to achieve the above object, the invention of claim 1 is directed to battery power supply means for supplying power, flow rate detection means for detecting gas flow rate, external device means for detecting gas leakage, etc., and supply and shutoff of gas medium. A blocking means for performing, a voltage detecting means for monitoring a supply voltage of the battery power supply means, a voltage warning determining means for determining that a voltage below a predetermined voltage is abnormal when detected by the voltage detecting means and outputting a warning signal, and the voltage detecting means A time measuring means for measuring a predetermined voltage or less after detecting a predetermined voltage, and determining whether the observation value detected by the flow rate detecting means is an abnormal usage amount, driving the shut-off valve at the time of abnormality determination, and the external device means in the abnormality judgment means for driving the abnormality detection time of the blocking means of the gas leakage and the like, and return means for said shut-off means for outputting a signal to return to the gas supply state, when the predetermined time has elapsed in the time measuring means As input inhibited the null signal performed blocking output to said interrupting means, and the input of the subsequent return signal performs a blocking output to the blocking means when an abnormality is detected by said abnormality determination means during a predetermined time measured by the time measuring means And a return prohibiting means for holding the gas use prohibited state and a notifying means for notifying the display when the battery warning is detected by the voltage warning means or when the abnormality is detected by the abnormality determining means .
[0011]
When the voltage detection means detects that the supply voltage of the battery power supply is lower than the predetermined voltage, the time measurement means starts time measurement, and the voltage abnormality determination means immediately starts the battery voltage drop abnormality as a customer or gas operator. When the battery appliance is used at the time of battery low detection, for example during cooking or in winter, a heating device such as a gas stove is notified. Gas customers can use gas appliances with peace of mind because the gas supply is not shut off while using the gas, and troubles such as forgetting to close the gas appliances can be prevented. and counts the elapsed time after lowering batteries by the time measuring means, the abnormal use of the gas appliance in gas demand house therebetween When, for example, accidentally stops gas supply by detecting blocking means optionally abnormality determination means continues to use a long time gas instrument. That is, if the shut-off means is driven in a lowered state after the battery voltage drop is detected, it is dangerous to continue to safely monitor the usage state of the gas appliance by accelerating the voltage drop due to further consumption of the battery voltage. In order to prevent gas appliances from being used by mistake, the shut-off state is maintained by prohibiting return acceptance of the shut-off means for gas supply, so that safety and reliability are improved.
[0016]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, and 3.
[0017]
(Example 1)
FIG. 1 shows a gas shut-off device according to a first embodiment of the present invention, wherein 1 is a control device for the gas shut-off device, 2 is a battery power supply means for supplying power to the entire gas shut-off device, 5 is a voltage detection means, The output voltage of the battery power supply means 2 is monitored, and when it is detected that the voltage has dropped below a predetermined value, a voltage drop signal is output. 6 is a voltage warning determination means. When the supply voltage of the battery power supply means 2 is lower than a predetermined voltage by the voltage detection means 5, a battery voltage drop signal is output. When this signal is input, a voltage drop warning notification signal is output. Then report that the battery is low. Reference numeral 7 denotes a time measuring means. When a voltage drop signal is output from the voltage detecting means 5, the time measuring means 5 starts counting the time that the gas shut-off device can be used after the battery voltage drop. That is, the time during which the safety monitoring of the usage state of the gas appliance can be performed in the normal voltage range is performed. Reference numeral 8 denotes a return means which, when operated, outputs a return signal from the shut-off means 3 to start gas supply to the shut-off means 3. Reference numeral 9 denotes a return prohibiting means, which determines whether or not to output a return signal from the return means 8 to the shutting means 3. If the return prohibiting state is not set, a return signal is output to open the shutting means 3 so that gas can be supplied. . When measurement of the usable time is completed by the time measuring means 7, that is, when a predetermined time has elapsed, the input of the return instruction signal from the return means 8 to the return prohibiting means 9 is prohibited, and the shutoff means 3 remains in the shutoff state. maintain. 4 is a notification means for displaying a battery voltage drop state, for example, a display means comprising an LCD element or an LED element, or having a communication function (not shown) using a public telephone line or the like. Report battery voltage drop abnormality to the safety center.
[0018]
Next, the operation of the above configuration will be described. A gas shut-off device is installed to monitor the use of gas appliances by gas consumers. When the battery capacity of the battery power supply means 2 is abnormally consumed for some reason under the monitoring conditions of the gas appliances, the voltage detection means 5 detects a low battery state. When the battery detection is detected by the voltage detection means 5, a voltage drop state signal is output to the voltage warning determination means 6, the time measurement means 7 and the return prohibition means 9. The voltage warning determination means 6 outputs a warning signal to the notification means 4 when detecting the lowered signal state. The notification unit 4 displays the low battery state using an LCD element, an LED element, or the like. In addition, the battery supply company is notified of abnormal battery low conditions via a telephone line. On the other hand, when the time measuring means 7 detects the battery low signal state, it performs time counting and measures the usable time of the gas cutoff device after the battery voltage drop. When the predetermined time is counted, the return prohibiting means 9 is prohibited from accepting the signal from the returning means 8 and when the gas supply is stopped by the shutting means 3 due to abnormal use of the gas appliance, the shutting means 3 is shut off by the returning means 8. Driving is prohibited. That is, by this, the gas supply is stopped thereafter to notify that the safe usable time of the gas cutoff device has elapsed.
[0019]
In this way, when the battery power supply of the gas shut-off device detects a value below the predetermined value by the voltage detection means 5, it is determined that there is an abnormality, and the battery voltage abnormality is immediately notified to the gas consumer and the gas supply company. Safety can be ensured when a customer uses a gas appliance when an abnormality occurs. For example, when a heater such as a gas stove is used when a battery voltage drop is detected, the gas must be supplied once by closing the gas valve of the gas stove and operating the return means 8 to use the gas again when suddenly shut off. . However, if the gas valve is accidentally opened and returned, the raw gas is exhausted, which may cause trouble. However, since it will be reported immediately, troubles due to shut-off during use of the gas appliance can be prevented, and then the gas shut-off device Even if the battery is used continuously without being replaced, if the time measuring means 7 detects that a predetermined time has elapsed, it is forcibly shut off and the gas supply is stopped, so that the battery voltage drop state is accelerated and cannot be shut off. Can be prevented, and safety, reliability, and usability are improved.
[0020]
(Example 2)
FIG. 2 shows a gas shut-off device according to a second embodiment of the present invention. In FIG. 2, components having the same functions as those in FIG.
[0021]
In FIG. 2, 10 is a flow rate detecting means for detecting the amount of gas used. For example, the flow rate detection means can apply a flow rate measurement method by measuring propagation time using an ultrasonic element, a flow rate measurement method by measuring a flow oscillation using the Coanda effect, or a gas amount measurement by a membrane type measuring unit. . 11 is an external device means, for example, a gas leak alarm for detecting gas leaks, a seismic sensing means for detecting earthquakes, or a pressure detecting means for detecting gas pressures, detecting gas leaks and earthquakes. When a gas pressure is detected, a signal is output. Reference numeral 12 denotes an abnormality determination unit, which detects, for example, that one gas appliance has been used for an abnormally long time from the state of use of the gas detected by the flow rate detection unit 10, or detects a gas leak with the external device unit 11. When an earthquake is detected, it is determined whether or not the earthquake has a predetermined intensity or more.
[0022]
Next, the operation of the above configuration will be described. A gas shut-off device is installed, and the gas appliance usage state of the gas consumer is monitored by the flow rate detection means 10 and the external equipment means 11. When abnormal use is detected by the abnormality determination means 12 during use, for example, when it is detected that the gas stove has been used for an abnormal long time, a cutoff signal is output to the cutoff means 3 to stop the gas supply. When the battery capacity of the battery power supply means 2 is abnormally consumed for some reason under such monitoring conditions, the battery detection state is detected by the voltage detection means 5. When the battery detection is detected by the voltage detection means 5, a voltage drop state signal is output to the voltage warning determination means 6, the time measurement means 7 and the return prohibition means 9. The voltage warning determination means 6 outputs a warning signal to the notification means 4 when detecting the lowered signal state. The notification unit 4 displays the low battery state using an LCD element, an LED element, or the like. In addition, the battery supply company is notified of abnormal battery low conditions via a telephone line. Further, the time measuring means 7 counts the time when the battery low signal state is detected, and measures the usable time of the gas shut-off device after the battery voltage drop. When the predetermined time is counted, the signal reception from the return means 8 is prohibited to the return prohibiting means 9 and a shutoff output is given to the shutting means 3. As a result, the subsequent gas supply is stopped, and notification is made that the safe usable time of the gas shut-off device has elapsed. Here, during the time counting by the time measuring means 7 after receiving the battery low signal, the usage state of the gas appliance of the consumer is detected by the flow rate detecting means 10 and the external device means 11, and the usage state is determined as the abnormality determining means 12. However, when an abnormal state is detected, the time count of the time measuring means 7 is stopped at that time and the gas use is prohibited.
[0023]
In other words, when the time measuring means 7 receives the battery low signal and counts the time, for example, if the gas stove is used for an abnormally long time, or if the gas hose is displaced for some reason, an abnormally high flow rate flows. When an abnormal state is detected by the abnormality determination unit 12 and is determined to be abnormal, a cutoff output is output to the cutoff unit 3 and a cutoff notification is sent to the return prohibition unit 9. Thereafter, even if the return output of the shut-off means 3 is input from the return means 8, the shut-off state is maintained and the return signal input is prohibited. It notifies the customer and the gas supplier that the gas cannot be supplied unless the gas shutoff device itself is replaced thereafter through the notification means 4.
[0024]
In this way, when the battery power source of the gas shut-off device detects a value below the predetermined value by the voltage detection means 5, it is determined as abnormal and immediately notifies the battery voltage abnormality to the gas customer and the gas supply company. Safety can be ensured when a consumer uses gas appliances at the time of occurrence. For example, when a heater such as a gas stove is used when a battery voltage drop is detected, the gas must be supplied once by closing the gas valve of the gas stove and operating the return means 8 to use the gas again when suddenly shut off. . However, if the gas valve is accidentally returned with the gas valve opened, the raw gas is discharged, which may cause a trouble. However, since a report is made immediately, a trouble caused by shutting off while using the gas appliance can be prevented. Even if the gas shut-off device is continuously used without being replaced after that, the time measuring means 7 is counting for a predetermined time, while the flow rate detecting means 10 detects an abnormal use state of the gas appliance, or an external device. When gas leak or CO leak is detected by the means 11, or when a strong earthquake is detected by the seismic sensor, the shut-off means 3 is driven to stop the gas supply. In such a case, if the shut-off means 3 is driven, a large amount of battery power is consumed, so that the battery is likely to be further lowered, and it becomes difficult to accurately monitor the use state of the gas appliance. In order to use the gas after the notification, the return operation of the shut-off means 3 is prohibited via the return means 8 and the shut-off state is maintained, and it is possible to prevent normal safety monitoring from being performed in a low voltage state. Use of gas by forcibly stopping gas use as described above, especially when there is a high possibility that battery capacity consumption will be accelerated under low-temperature conditions in winter or high-temperature conditions in summer Can be notified that the battery voltage is abnormal, and as a result, the safety and usability of the gas cutoff device are improved.
[0025]
(Example 3)
FIG. 3 shows a gas shut-off device according to a third embodiment of the present invention. 3, components having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.
[0026]
In FIG. 3, reference numeral 13 denotes voltage abnormality determination means. When the voltage detection means 5 detects that the supply voltage from the battery power supply means 2 is equal to or lower than a predetermined voltage, a battery voltage drop signal is input, and a cutoff signal is sent to the cutoff means 3. Output and stop using gas appliances. 14 is a shut-off signal delay means. When a shut-off signal is outputted from the battery abnormality judging means 13, it is judged by the flow signal from the flow rate detecting means 10 whether the gas appliance is used. If the flow rate signal disappears, a shutoff output is performed. Reference numeral 15 denotes a battery warning output means. When the shutoff signal delay means 14 causes the shutoff signal to be in a delayed state, the battery warning state is displayed and notified to the alerting means 4.
[0027]
Next, the operation of the above configuration will be described. A gas shut-off device is installed, and the gas appliance usage state of the gas consumer is monitored by the flow rate detection means 10 and the external equipment means 11. When abnormal use is detected by the abnormality determination means 12 during use, for example, when it is detected that the gas stove has been used for an abnormal long time, a cutoff signal is output to the cutoff means 3 to stop the gas supply. When the battery capacity of the battery power supply means 2 is abnormally consumed for some reason under such monitoring conditions, the battery detection state is detected by the voltage detection means 5. When the battery detection is detected by the voltage detection means 5, a reduction state signal is output to the time measurement means 7, the return prohibition means 9, and the voltage abnormality determination means 13. When the voltage abnormality determination means 13 detects the lowered signal state, it outputs a cutoff signal to the cutoff signal delay means 14. The cutoff signal delay means 14 determines the output signal of the flow rate detection means 10, and if the flow rate signal is input, the consumer determines that the gas appliance is in use and delays the cutoff signal. Thereafter, when it is input that the flow rate signal is lost from the flow rate detection means 10, it is determined that the use of the gas appliance is stopped, a cutoff signal is output to the cutoff means 3, the gas flow path is shut off, and the gas supply is stopped. At the same time, the battery low state is displayed on the LCD element or LED element by the notification means 4. In addition, the battery supply company is notified of abnormal battery low conditions via a telephone line. Here, when a battery low state is detected, if the consumer is using a gas appliance, the gas supply stoppage by the cutoff means 3 is delayed by the cutoff signal delay means 14, but the delay signal is input to the voltage warning output means 15. The notification means 4 is notified. In other words, in the case of a consumer who uses gas appliances continuously, for example, when using commercial or commercial water heaters or heaters, it is difficult to notice the battery voltage drop state during the period when the gas appliances stop considerably, Immediately after entering the signal delay state, the voltage warning output means 15 notifies the notification means 4 of a battery low abnormality display. Even if the shut-off signal is delayed by this, a warning is displayed by the notification means 4 or an abnormality notification is made to the gas company's security center using a public telephone line by the communication means (not shown). A gas company can notice the battery low abnormality and immediately take measures such as replacing the gas shutoff device. Further, the time measuring means 7 counts the time when the battery low signal state is detected, and measures the usable time of the gas shut-off device after the battery voltage drop. When the predetermined time is counted, the signal reception from the return means 8 is prohibited to the return prohibiting means 9 and a shutoff output is given to the shutting means 3. As a result, by stopping the gas supply thereafter, it is notified that the safe useable time of the gas shut-off device has elapsed. Here, during the time counting by the time measuring means 7 after receiving the battery low signal, the usage state of the gas appliance of the consumer is detected by the flow rate detecting means 10 and the external device means 11, and the usage state is determined as the abnormality determining means 12. However, when an abnormal state is detected, the time count of the time measuring means 7 is stopped at that time and the gas use is prohibited. That is, when the time measuring means 7 receives the battery low signal and counts the time, for example, if the gas stove is used for an abnormal long time or the gas hose is displaced for some reason, an abnormally high flow rate flows. When the abnormality determination unit 12 detects such a state and determines that it is abnormal, it outputs a cutoff output to the cutoff unit 3 and sends a cutoff notification to the return prohibition unit 9. Thereafter, even if the return output of the shut-off means 3 is input from the return means 8, the shut-off state is maintained and the return signal input is prohibited. It notifies the customer and the gas supplier that the gas cannot be supplied unless the gas shutoff device itself is replaced thereafter through the notification means 4.
[0028]
In this way, when the battery power source of the gas shut-off device detects a predetermined value or less by the voltage detecting means 5, the voltage abnormality judging means 13 judges that there is an abnormality and outputs a shut-off signal, but shuts off if the gas consumer is using the gas appliance. The signal is delayed, and the battery warning abnormality is notified to the gas consumer and gas supply company by the voltage warning output means 15 via the notification means 4, so that it can be immediately determined that the battery voltage is abnormal, and the gas shut-off device replacement etc. Emergency measures can be taken. That is, since the voltage abnormality is not clarified by shutting off the shut-off means, troubles such as return operation of the shut-off means and inspection of gas appliances can be saved, which saves the gas business and improves safety and usability.
[0029]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the battery power source of the gas shut-off device detects a predetermined value or less by the voltage detecting means, it is determined that there is an abnormality, and the battery voltage abnormality is immediately notified to the gas consumer or gas supply company. since notifies the trouble due to blockade of the gas appliance used, i.e. the trouble that resume gas supply without closing the gas valve can be prevented. Continued to time be used measuring means gas cutoff device is not replaced after it to the middle of counting a predetermined time when detecting an abnormal state of use of the gas appliance by the flow rate detection means or the external device When gas leak or CO leak is detected by the means, or when a strong earthquake is detected by the seismic sensor, the shut-off means is driven to stop the gas supply. In such a case, driving the shut-off means consumes a large amount of battery power, so the battery is likely to further decrease, making it difficult to accurately monitor the use state of the gas appliance. In order to use the gas after the notification, the return operation of the shut-off means is prohibited via the return means and the shut-off state is maintained, so that it is possible to prevent normal safety monitoring from being performed in a low voltage state, thereby preventing the gas user. The battery voltage abnormality can be notified, and as a result, the safety and usability of the gas shutoff device are greatly improved.
[Brief description of the drawings]
FIG. 1 is a control block diagram of a gas cutoff device in a first embodiment of the present invention. FIG. 2 is a control block diagram of a gas cutoff device in a second embodiment of the present invention. FIG. 4 is a control block diagram of a conventional gas shut-off device according to an embodiment.
2 Battery power supply means 3 Shut off means 4 Notification means 5 Voltage detection means 6 Voltage warning judgment means 7 Time measurement means 8 Restoration means 9 Restoration prohibition means 10 Flow rate detection means 11 External device means 12 Abnormality judgment means 13 Voltage abnormality judgment means 14 Break signal Delay means 15 Voltage warning output means

Claims (1)

Battery power supply means for supplying power, flow rate detection means for detecting gas flow rate, external device means for detecting gas leakage, etc., cutoff means for supplying and shutting off the gas medium, and supply voltage of the battery power supply means A voltage detection means for monitoring; a voltage warning determination means for determining that an abnormality is detected when a voltage equal to or lower than a predetermined voltage is detected by the voltage detection means; and a time measurement for measuring a predetermined time after detecting the voltage lower than the predetermined voltage by the voltage detection means An abnormality determination unit that determines whether the observation value detected by the flow rate detection unit is an abnormal usage amount and drives the blocking unit at the time of abnormality determination or when an abnormality such as gas leakage is detected by the external device unit, the blocking means performs a returning means for outputting a signal to return to the gas supply state, the cutoff output to said interrupting means as an input prohibiting a return signal when a predetermined time has elapsed in the time measuring means, and wherein A return inhibition unit for holding a gas unusable prohibits the input of the subsequent return signal performs a blocking output to said interrupting means when the abnormality was detected by the abnormality determination means during a predetermined time measured between the measuring means, wherein A gas shut-off device comprising: a notification means for notifying when a battery low is determined by a voltage warning means or when an abnormality is detected by an abnormality determination means .

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