JP5071121B2 - Gas shut-off device - Google Patents

Description

  The present invention relates to a network and a gas shut-off device, and more particularly, to a gas shut-off device that enhances safety and improves usability by using an appliance use restriction control function based on an output signal of network connection detection.

  Conventionally, as this type of gas shut-off device, for example, there has been one disclosed in Patent Document 1.

  The gas cutoff device of Patent Document 1 will be briefly described with reference to FIG. As shown in FIG. 3, the gas flow rate integration means 10a-1 capable of integrating the flow rate of LP gas supplied to the gas combustion appliance 8 through the gas container 1 gas supply pipe 5 and resetting the integrated flow rate value, and the gas An alarm signal generating means for generating an alarm signal when it is detected that the gas remaining amount in the gas container 1 has decreased below a predetermined determination value based on the integrated flow rate value by the flow rate integrating means 10a-1, and transmitting the alarm signal to the outside 10a-2 and when the supply of LP gas to the gas combustion appliance 8 is continuously performed exceeding the predetermined use time cutoff set value in order to cut off the supply of LP gas to the gas combustion appliance 8 Or when the LP gas supply to the gas combustion appliance 8 is continuously performed exceeding a predetermined first monitoring value based on the usage time cutoff setting value, the usage time cutoff setting value is automatically set. Reset upward The usage time cutoff device 10a-3 thus made detects the continuous usage time of the gas combustion appliance 8 that exceeds the usage time cutoff set value or the first monitoring value, and is above the usage time cutoff set value. When the resetting is started, a usage time increase signal generating means 10a-4 for generating a usage time increase signal and transmitting it to the outside is provided.

  With the above configuration, the flow rate of LP gas supplied from the gas container 1 to the gas combustion appliance 8 through the gas supply pipe 5 is integrated by the gas flow rate integrating means 10a-1, and the alarm signal generating means 10a-2 is integrated by this integrated flow rate. When it is detected that the remaining amount of gas in the gas container 1 has decreased below the judgment value based on the value, an alarm signal is generated, transmitted to the outside, and the integrated flow rate value can be reset. The accumulated flow value of the integrating means 10a-1 manages the remaining amount of gas in the gas container 1 after the gas container 1 is replaced with a new gas container 1 that is full, and the remaining amount of gas in the gas container 1 is less than the judgment value. It can be notified by an alarm signal that it has decreased.

In addition, when LP gas is continuously supplied to the gas combustion appliance 8 beyond a predetermined usage time cutoff setting value that interrupts the supply of LP gas to the gas combustion appliance 8, or based on the usage time cutoff setting value. When the LP gas supply to the gas combustion appliance 8 is continuously performed exceeding the predetermined first monitoring value, the usage time cutoff set value is automatically reset upward. The time cutoff device 10a-3 detects the continuous usage time of the gas combustion appliance 8 that exceeds the usage time cutoff set value or the first monitoring value, and starts to reset the usage time cutoff set value upward. Since the usage time increase signal generating means 10a-4 generates a usage time increase signal and transmits it to the outside, when the usage time increase signal is generated after the alarm signal is generated, these signals are transmitted outside. Continuous use of gas burning appliance 8 Since the interval exceeds the usage time cutoff set value or exceeds the first monitoring value even if it does not exceed the usage time cutoff set value, it is longer than the normal continuous usage time, so the gas remaining amount is normal It can be judged that there is a very high probability that a so-called “gas out” will occur, which will be consumed at a faster rate than the LP gas in the gas container 1.
JP 2001-74532 A

  However, in the above-described conventional configuration, as described in the background art, as an example of resetting the usage time cutoff setting value that limits the continuous usage time of the gas combustion appliance 8 upward under a predetermined condition, In addition, when LP gas is continuously supplied to the gas combustion appliance 8 beyond a predetermined usage time cutoff setting value that shuts off the supply of LP gas to the gas combustion appliance 8, the usage time cutoff setting value is automatically set. Only the LP gas remaining amount management device is disclosed in which the usage time increase signal is transmitted to the outside when the resetting is started. In a gas shut-off device that monitors the usage time of equipment based on the allowable continuous use time set according to the equipment, the gas meter is connected to the network and can be remotely monitored by the monitoring center. On whether, and to determine the extension possibility of continuous use allowable times, improved usability while ensuring safety is not disclosed with respect to that.

  In order to solve the above-described conventional problems, a gas shutoff device according to the present invention includes a flow rate detection unit that measures a gas flow rate, a flow rate calculation unit that converts an instantaneous flow rate value from a measurement value of the flow rate detection unit, and the flow rate calculation. The flow rate storage means for storing the instantaneous flow rate value obtained by the means in time series and storing it as a flow rate pattern, the average flow rate calculation means for averaging the instantaneous flow rate values obtained by the flow rate calculation means to obtain an average flow value, and the average A flow rate registration means for registering the flow rate value when it is determined from the average flow value obtained by the flow rate calculation means, an appliance flow rate storage means for storing a flow rate pattern for each appliance, the flow rate storage means, and the appliance flow rate storage The device estimation means for estimating the device to be used by comparing the respective flow rate patterns stored in the device, and the use time is measured when the flow value registered in the flow rate registration device is determined. Use time measurement means, use time setting means for storing a limit value of continuous use time for each appliance, and comparison between the use time of the use time measurement means and the set value of the use time setting means to determine whether there is an abnormality in the use appliance An abnormality determining means for determining whether there is an abnormality determination of the abnormality determining means, a shutting means for shutting off gas supply, a communication means for reporting flow rate information and abnormality information to the center, and a predetermined timing or predetermined A communication confirmation means for determining that remote monitoring is functioning normally when a message is transmitted to the center and a response message is received from the center at a period of time, and it is determined that communication with the center has been normally executed by the communication confirmation means. A use time switching means for changing the set value of the use time setting means in a direction to extend, and the abnormality determination means, when monitoring the appliance continuous use time, Using the limit value of the continuous use time corresponding to the use tool estimated by the estimation means, the use time is compared with the use time to determine whether there is an abnormality, and the use time setting means is used for the continuous use corresponding to the estimated tool. The set value of the use time setting means can be extended within the range of the maximum extendable time set according to the time limit value.

  According to the above invention, it is possible to detect that the appliance has been used by the flow rate detection means, and to determine the appliance to be used using the flow rate pattern in which the flow rate values converted by the predetermined calculation means are stored in time series, A monitoring center that is capable of monitoring appropriate continuous usage time corresponding to each appliance having different usage conditions based on a predetermined continuous usage time for each appliance, and that is managed by a gas company with a gas meter connected to the network Depending on whether or not remote monitoring is possible, whether or not the continuous use allowable time can be extended is determined, and when it is determined that the communication center can be secured and the remote monitoring is possible by the monitoring center, the usage time Change the limit value of the continuous use time corresponding to the estimated equipment set by the use time setting means by the switching means so that it extends within the maximum extendable time range. This makes it possible for gas consumers to use the appliance for a long time, and to remotely monitor the appliance usage state at a remote monitoring center, and in particular, use it for a long time like a heating appliance. When it is desired to use the instrument for a long time, the usability can be improved without being interrupted in a short time, and the safety can be improved.

  The gas shut-off device of the present invention is used by limiting the appliance use time by comparing the use time and the predetermined continuous use time limit for each appliance estimated based on the flow rate information. The basic principle is to ensure safety by executing appropriate monitoring for each appliance under different conditions. In addition, the gas meter is connected to the network and is remotely monitored by a monitoring center managed by the gas company. Whether or not the continuous use allowable time can be extended is determined depending on whether or not the communication state is secured and the monitoring center determines that the remote monitoring is possible. By changing the continuous use time limit corresponding to the estimated appliance to be extended within the maximum possible extension time range, gas consumers will use the appliance for a long time It is possible to remotely monitor the use state of the appliance at a remote monitoring center, especially when a long-time use appliance such as a heating appliance is to be used for a long time. It is possible to improve the user-friendliness without any problems and to improve safety.

  In other words, the gas shut-off device and the monitoring center managed by the gas company are connected using a communication line such as a network, and the gas customer is using the appliance at the monitoring center managed by the gas company or for a long time. It is possible to ensure the safety of equipment use by monitoring information such as when it has been used and the usage time has been shut off for 24 hours, and it is possible to ensure the safety of equipment use. It is possible to take actions such as stopping the use, and on the other hand, the gas consumer can use the gas appliance for a long time with peace of mind, improving the usability and improving the safety.

  According to a first aspect of the present invention, a flow rate detecting means for measuring a gas flow rate, a flow rate calculating means for converting an instantaneous flow rate value from a measurement value of the flow rate detecting means, and an instantaneous flow rate value obtained by the flow rate calculating means are associated in time series. A flow rate storage means for storing as a flow rate pattern, an average flow rate calculation means for averaging the instantaneous flow rate values obtained by the flow rate calculation means to obtain an average flow value, and an instrument flow rate from the average flow value obtained by the average flow rate calculation means The flow rate registration means for registering the flow value when determined, the instrument flow rate storage means for storing the flow rate pattern for each instrument, and the respective flow rate patterns stored in the flow rate storage means and the instrument flow rate storage means. Appliance estimation means for estimating the appliance to be used, usage time measurement means for measuring the usage time when the flow rate value registered in the flow rate registration means is determined, and continuous use for each appliance Use time setting means for storing the limit value, abnormality determination means for comparing the use time of the use time measurement means and the set value of the use time setting means to determine whether there is an abnormality in the appliance used, and the abnormality determination means A shut-off means for shutting off the gas supply when an abnormality determination is established, a communication means for notifying the center of flow rate information and abnormality information, and transmitting a message to the center at a predetermined timing or a predetermined cycle, and a response message from the center Communication confirmation means for determining that remote monitoring is functioning normally when receiving the message, and extending the set value of the usage time setting means when it is determined that communication with the center has been normally executed by the communication confirmation means. Use time switching means for changing the direction, and the abnormality determining means, when monitoring the appliance continuous use time, corresponds to the connected appliance estimated by the appliance estimation means. The use time limit is compared with the use time to determine the presence or absence of abnormality, and the use time setting means is the longest extension set according to the continuous use time limit value corresponding to the estimated appliance. The setting value of the use time setting means can be extended within the range of possible time.

Then, it can be detected by the flow rate detection means that the instrument has been used, and the instrument to be used can be determined using a flow rate pattern in which the flow rate value converted by the predetermined calculation means is stored in time series. Appropriate continuous use time monitoring can be performed for each appliance with different use conditions based on another continuous use time, and remote monitoring can be performed by a monitoring center managed by a gas company with a gas meter connected to the network. Whether or not the continuous use allowable time can be extended is determined depending on whether or not it is in a possible state. When it is determined that the communication state can be secured and remote monitoring is possible by the monitoring center, it is used by the usage time switching means. By changing the limit value of the continuous use time corresponding to the estimated instrument set by the time setting means to extend in the range of the maximum extendable time, The customer can use the appliance for a long time, and can remotely monitor the appliance usage state at a remote monitoring center. When it is desired to use the device for a long time, the usability can be improved without being interrupted in a short time, and the safety can be improved.

  In addition, the second aspect of the invention is that, as the usage time switching means in the first aspect of the invention, when the set value of the usage time setting means is changed, the change processing can be performed a plurality of times within the maximum extendable time range. It is a feature.

  Then, when it is confirmed that the communication state with the monitoring center managed by the gas company can be secured normally by the communication means, it is possible to extend the continuous use time for each appliance, and the time limit can be extended to the longest possible extension time. Therefore, the time limit can be extended in stages while confirming the remote monitoring function, and the usability can be improved while ensuring safety.

  Further, a third invention includes learning means for measuring a usage time for a predetermined period and multiplying a predetermined coefficient to update a setting value of the usage time setting means in the first and second inventions, wherein the usage time switching means is The setting value of the use time setting means can be extended within the range of the maximum extendable time set according to the setting value updated by the learning means.

  Based on the learning result of the appliance usage pattern for each consumer, the maximum extension time of appliance usage time that can be set when the communication state is normally secured with the monitoring center managed by the gas company by the communication means. Because it is set according to the time limit set by the user, it is possible to set the limit value of continuous use time for each appliance that is optimal according to the appliance usage situation of the consumer, and balance between safety and usability Can be provided.

(Embodiment 1)
FIG. 1 is a diagram showing a connection form between a gas cutoff device and a network in Embodiment 1 of the present invention, and FIG. 2 is a control block diagram of the gas cutoff device. In FIG. 1 and FIG. 2, the same reference numerals are given to the means for performing the same function as in FIG.

  In FIG. 1, the gas shut-off device 4 is connected to a wireless slave unit 9, and communication from the wireless slave unit 9 is performed with the wireless master unit 10, and the wireless master unit 10 is connected to the gas operator via the network 3. Connected to the monitoring center 2. There are various methods of radio such as specific low power or short-range radio. This figure shows a case where a wireless slave unit and a master unit are used, but a signal transmission device may be connected to a gas company monitoring center via a network (such as a telephone line) from a gas cutoff device (not shown). )

  FIG. 2 is an example of a control block diagram of the gas cutoff device 4.

  And when the installed gas appliance is used and gas consumption occurs, the gas shut-off device 4 monitors the usage state, and the usage amount is measured and stored. The data stored in the gas shut-off device 4 responds based on a periodic data request command from the gas company.

In FIG. 2, 7 is a flow rate detecting means for measuring the gas flow rate. There are various methods as the flow rate detection means 7, and an ultrasonic signal is transmitted from one to the other with a pair of ultrasonic sensors installed in the flow path shown in this embodiment, and the gas flow rate used is determined from the propagation time. For detecting the flow rate, or for determining the flow rate from the impedance that changes depending on the flow with a hot-wire sensor installed in the flow path, and for detecting the amount of gas with a metering membrane, Some devices detect the flow rate as an electrical pulse signal.

  For example, the flow rate detection means 7 using an ultrasonic sensor will be briefly described. A first transmitter / receiver that transmits or receives ultrasonic waves and a second transmitter / receiver that receives or transmits ultrasonic waves are arranged opposite to each other in the flow direction, and are determined in advance. In each cycle, an ultrasonic signal is transmitted from upstream to downstream and from downstream to upstream, and the propagation time is measured. Then, the flow rate calculation unit 12 takes into account the flow rate of the flow path and the flow state of the fluid from the difference in the propagation time of the ultrasonic waves between the first transmitter and the second transmitter. Obtain the flow rate value.

  Then, the average flow rate calculation means 20 averages the instantaneous flow rate values obtained every predetermined period to obtain the average flow rate value. Reference numeral 13 denotes a flow rate registration means. When the average flow rate value obtained by the average flow rate calculation means 20 is equal to or higher than a predetermined flow rate, it is registered as an appliance flow rate as a usage time monitoring target.

  In addition, the instantaneous flow rate value for each predetermined period obtained by the flow rate calculation unit 12 is input to the flow rate storage unit 23 in association with a time series, and is stored as a flow rate pattern for each predetermined period. A characteristic flow rate pattern for each appliance is stored in the appliance flow rate storage unit 22, and the flow rate pattern stored in the flow rate storage unit 23 and the flow rate pattern stored in the appliance flow rate storage unit 22 are stored in the appliance estimation unit 24. In comparison, the appliance to be used is estimated based on the characteristic flow rate information.

  Reference numeral 14 denotes a usage time measuring means. When the average flow rate value obtained by the average flow rate calculating means 20 by the flow rate registration means 13 is registered as an appliance flow rate in the usage time monitoring target, the usage time measurement is started. Reference numeral 15 denotes a use time setting means, and a time limit for use time is set in advance according to the flow rate range of the appliance flow rate registered in the flow rate registration means 13 and information on the appliance used estimated by the appliance estimation means 24. For example, a table in which a limit value for use time corresponding to the flow rate region is set for each instrument is provided. In addition, the usage time ranges from the lower limit to the upper limit of the usage time range according to the usage time for each gas consumer, and is set within that range.

  Reference numeral 16 denotes an abnormality determining means for monitoring abnormality of the appliance used. Specifically, the use time measured value measured by the use time measuring means 14 is compared with the estimated value of the appliance used by the use time setting means 15 and the limit value of the continuous use time set based on the appliance flow rate information. Then, it is determined whether the usage time measurement value exceeds the limit value of the continuous usage time and is not being used abnormally. In addition, the monitoring judgment value of the maximum use flow rate is stored from the registered flow rate of the flow rate registration means 13, for example, when the hose that supplies gas to the stove or the like is disconnected for some reason, an abnormally large flow rate occurs. A total flow cutoff value or the like for monitoring such a state is set. By comparing and determining this set value and the registered flow rate value of the flow rate registration means 13 by the abnormality determination means 16, the registered flow rate value is the maximum used. Determine whether the flow rate value is exceeded. When the abnormality determination means 16 determines that there is an abnormality, a cutoff signal is sent to the cutoff means 17 to stop the gas supply. In addition, the shut-off state and shut-off content are displayed on the liquid crystal display element and the like, and the monitoring center 2 that performs gas safety monitoring is notified through the communication means 18 and the like.

19 is a use time switching means, which is used when the communication confirmation means 25 confirms the communication state between the gas shutoff device 4 and the monitoring center 2 and it is determined that the communication is normally performed and the remote monitoring function is operating normally. The set value of the time setting means 15 is changed within a predetermined longest extendable time range. Specifically, network connection communication is performed with the monitoring center 2 of the gas company through the wireless slave unit 9 and the network 3 through the communication unit 18. When the communication means 18 receives the response communication from the gas company center 2 via the network 3, the communication confirmation means 25 determines that the communication is normally performed and the remote monitoring function is operating normally, and is used. The time switching means 19 sets the upper limit value of the set value of the usage time setting means 15 to the upper limit value further extended for all sections.

  When the gas cutoff device 4 and the monitoring center 2 are communicatively connected, the abnormality determination unit 16 compares the use time set value with the extended cutoff value set in the range of the further upper limit value and the lower limit value.

  Next, the operation of the gas shut-off device configured as described above will be described.

  The gas shut-off device 4 communicates with a wireless master device 10 as a repeater via a wireless slave device 9 by a wireless signal, for example. The wireless master device 10 is further connected to the network 3 and connected to the monitoring center 2 of the gas company via wired communication or a wireless communication network. Then, using this communication network, the gas shut-off device 4 is normally connected to the monitoring center 2 via the communication means 18 from the communication confirmation means 25 at a predetermined timing or at a predetermined cycle. Center communication to confirm whether or not.

  In this center communication, first, the wireless slave unit 9 of the gas cutoff device 4 communicates with the monitoring center 2 through the network 3 via the wireless master unit 10 as a repeater. When the monitoring center 2 receives it, it returns a response message. When the communication confirmation unit 25 receives the response message via the communication unit 18, the communication confirmation unit 25 outputs a signal capable of setting the maximum extension time further than the upper limit value of the setting value of the usage time setting unit 15. If the communication connection with the network 3 cannot be established and the response message from the monitoring center 2 cannot be received, the communication confirmation unit 25 outputs an upper limit value extension setting disable signal to the usage time setting unit 15, and the time limit is Lower upper limit setting when there is no network connection.

  Here, when a response message is sent back from the monitoring center 2 by center communication executed at a predetermined timing or at a predetermined cycle, a normal communication state is ensured between the gas cutoff device 4 and the monitoring center 2. The monitoring center 2 determines that the remote monitoring function of the gas shut-off device 4 is operating normally, so that the instrument use time can be extended.

  And the limit value of the appliance usage time that can be extended when the remote monitoring function is normal can be set within the range of the predetermined maximum extension time, and the setting method is also the maximum extension when the response message is sent back for the first time. The possible time may be set, or may be set in a plurality of times within a range of the maximum extendable time each time a response message is returned at a predetermined timing or at a predetermined cycle. According to the former setting method, it is possible to easily perform the extension changing process of the limit value of the appliance usage time, and to improve the usability. According to the latter setting method, the time limit can be extended step by step while confirming the remote monitoring function, and the usability can be improved while ensuring safety.

  The gas shut-off device 4 detects the flow rate by the flow rate detecting means 7 when a gas appliance, for example, a gas stove or a hot water heater, etc. possessed at a customer's house is used. For example, when an ultrasonic sensor is used, the propagation time of the ultrasonic signal is measured as a detected value, and this signal is sent to the flow rate calculation means 12 to be calculated as an instantaneous flow rate value. When the value exceeds a predetermined instrument flow rate value, it is determined that the instrument is used and is registered in the flow rate registration means 13.

When the flow rate is registered in the flow rate registration unit 13, the usage time measurement unit 14 starts to count the usage time of the appliance. On the other hand, the usage time setting unit 15 inputs the flow rate information of the flow rate storage unit 23 and the appliance flow rate storage unit 22 and uses the usage time for each flow rate category to which the flow rate registered for each usage appliance estimated by the appliance estimation unit 24 belongs. Have a lower limit value and an upper limit value. Normally, the maximum upper limit value is set as the setting value of the usage time setting means 15, but when setting an optimal appliance usage time limit value according to the appliance usage status of the consumer, Learning means for measuring the usage time for a certain period and multiplying a predetermined coefficient to update the setting value is provided, and the setting value updated by the learning means is monitored as a limit value of the appliance usage time.

  In the configuration in which the appliance usage time can be extended when the remote monitoring function of the present invention is operating normally, the usage time switching means 19 is set according to the set value updated by the learning means. By setting the set value of the use time setting means 15 within the range of the maximum extendable time, it is possible to provide a gas shut-off device that takes into account the balance between safety and usability.

  Then, the abnormality determination means 16 compares the use time measurement means 14 and the set value at that time of the use time setting means 15 and monitors whether the use time exceeds the setting.

  On the other hand, it is also monitored in parallel whether or not the flow rate value obtained before registration in the flow rate registration means 13 increases more rapidly than the flow rate after registration and does not exceed an abnormal flow rate due to a cause such as hose disconnection. When the usage time measuring means 14 determines that the time limit of the usage time setting means 15 has been exceeded, the abnormality determination means 16 immediately outputs a cutoff signal to the cutoff means 17 to stop the gas supply and ensure safety. .

  When a gas table is used for cooking or a gas fan heater or the like is used, it may be used for a relatively long time. Depending on the gas customer, the gas shut-off device 4 and the monitoring center 2 are connected by communication. When the gas shut-off device 4 and the monitoring center 2 are communicatively connected, information on the long-term use of the instrument is immediately sent from the gas shut-off device 4 Notification can be made via the network 3, and detailed information can also be obtained from the monitoring center 2 via a communication message via the network 3.

  As described above, since the appliance usage state of the gas consumer can be monitored from a remote location such as the monitoring center 2, it becomes possible to extend the time limit of the usage time, and the gas customer can use the gas fan heater for heating for a longer time. Although you want to use it, it will not be cut off at the preset usage time, or you will not have to stop the instrument once due to a report from the gas company. It is possible to ensure safety.

  It should be noted that the numerical limitation used in the present embodiment is an example, and the usage pattern is not limited to this embodiment.

  As described above, the gas shut-off device according to the present invention can appropriately ensure the use restriction function of the gas flow rate device by being remotely monitored through a network connection, and can be applied to the entire device monitoring device. is there.

The figure which shows the connection form of the gas cutoff device and the network Control block diagram of gas shutoff device in embodiment 1 of the present invention Control block diagram of a conventional gas shut-off device

Explanation of symbols

7 Flow rate detection means 12 Flow rate calculation means 13 Flow rate registration means 14 Usage time measurement means 15 Usage time setting means 16 Abnormality determination means 17 Blocking means 18 Communication means 19 Usage time switching means 20 Average flow rate calculation means 22 Instrument flow rate storage means 23 Flow rate storage Means 24 Instrument estimation means 25 Communication confirmation means

Claims (3)

A flow rate detecting means for measuring a gas flow rate, a flow rate calculating means for converting the measured value of the flow rate detecting means into an instantaneous flow rate value, and storing the instantaneous flow rate value obtained by the flow rate calculating means in a time series as a flow rate pattern The flow rate storage means, the average flow rate calculation means for averaging the instantaneous flow rate values obtained by the flow rate calculation means to obtain an average flow rate value, and the flow rate when the appliance flow rate is determined from the average flow rate value obtained by the average flow rate calculation means The flow rate registration means for registering the value, the appliance flow rate storage means for storing the flow rate pattern for each appliance, and the flow rate storage means and the respective flow rate patterns stored in the appliance flow rate storage means are estimated to estimate the appliance to be used. The appliance estimation means, the usage time measurement means for measuring the usage time when the flow value registered in the flow rate registration means is determined, and the continuous use time limit value for each appliance are classified. Use time setting means, abnormality determination means for comparing the use time of the use time measurement means and the set value of the use time setting means to determine whether there is an abnormality in the appliance used, and whether the abnormality determination means is abnormal A communication means for notifying the center of the gas supply, a communication means for notifying the center of flow rate information and abnormality information, and a remote message when a message is transmitted to the center and a response message is received from the center at a predetermined timing or a predetermined cycle. Communication confirmation means for determining that monitoring is functioning normally, and use for changing the setting value of the usage time setting means to be extended when it is determined that communication with the center is normally executed by the communication confirmation means With time switching means,
The abnormality determination means, when monitoring the continuous use time of the appliance, compares the use time with the limit value of the continuous use time corresponding to the appliance used estimated by the appliance estimation means, and determines whether there is an abnormality. And
The gas shut-off device in which the use time setting means is capable of extending the set value of the use time setting means within the range of the maximum extendable time set according to the limit value of the continuous use time corresponding to the estimated appliance. The gas shut-off device according to claim 1, wherein when the set value of the use time setting means is changed, the use time switching means can perform a change process a plurality of times within a range of the maximum extendable time. Learning means for measuring the usage time for a certain period and multiplying by a predetermined coefficient to update the setting value of the usage time setting means,
The gas shut-off according to claim 1 or 2, wherein the use time switching means is capable of extending the set value of the use time setting means within the range of the maximum extendable time set according to the set value updated by the learning means. apparatus.

Images