JP2010175126A - Gas shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure safety by switching between usage of a device or leakage by a plurality of means. <P>SOLUTION: This gas shut-off device includes a flow rate storing means for measuring an instantaneous flow rate and memorizing the same in time-series, a first abnormality determining means for determining an average flow rate from the determined instantaneous flow rate, detecting whether a flow rate is a leakage flow rate or not by a leakage flow rate determining means on the basis of the average flow rate, and operating a leakage timer in a case when the flow rate is a leakage determination flow rate or more, and determining whether the timer reaches a prescribed time or not, and a notifying means for memorizing a flow rate pattern of each device in parallel with each other in a characteristic memorizing means in advance, determining the leakage by a leakage discriminating determining means when a device estimating means determines not a device but leakage on the basis of the instantaneous flow rate of the flow rate storing means, and performing a display for warning or a display for shut-off when the leakage is established. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas shut-off device, which monitors leakage flow in a customer's house in parallel with a plurality of security judging means, and performs a warning or shut-off when an abnormal use of equipment is reliably detected, thereby preventing an accident in advance. It relates to the device.

  Conventionally, this type of gas shut-off device has a configuration shown in FIG. 3 (see, for example, Patent Document 1).

  This conventional gas shut-off device will be briefly described with reference to FIG. 3. 101 is a gas supply pipe, 102 is a meter cock, 103 is a gas meter, 104 is an emergency shut-off valve, and is closed at an instantaneous flow rate to avoid power consumption. To do. Reference numeral 105 denotes a flow rate measuring device, which is a flow rate sensor attached to the gas meter, and transmits a digital signal such as a pulse. 106 is a control device, a flow rate measuring device 105 attached to the gas supply pipe, an emergency shutoff valve 104 attached to the gas supply pipe, the gas consumption of each gas appliance, and the corresponding continuous use safety. When the total flow rate of the supply gas is measured at regular time intervals by the gas appliance storage means for storing the time and the flow rate measuring device 105, and a change is recognized in the total flow rate, one unit corresponding to this increase is obtained. When it is judged that the gas appliance has started its use, the consumption of this gas appliance is registered in sequence, and if a decrease in the overall flow rate is observed, the gas appliance with the gas consumption corresponding to this decrease has been stopped. When a change is detected in the total flow rate of the supply gas measured by the flow rate measuring device and the gas flow storage means for each device that determines and registers the usage status of the gas appliance, time measurement starts, and then the change occurs. Detected Time measurement is continued until this time exceeds the continuous safe use time corresponding to the largest consumption of the consumption of gas appliances currently in use stored in the gas flow storage means for each appliance. And a determination means for sending a signal for closing the emergency shut-off valve 104. Reference numeral 107 denotes a power source for the control device 106, which uses a battery. 108 is a battery for an emergency shutoff valve.

  Next, the operation of the configuration of the conventional example will be described. A microcomputer or the like is used for the control device 106 and the flow of the supply gas is monitored. When it is determined that there is an abnormality, the stop of the supply gas is instructed and the emergency shut-off valve 104 is operated.

Generally, the gas consumption of gas appliances is determined, and appliances usually used in the home are in the following ranges. For example, in the case of 6B gas, pilot flame large instrument 0.02~0.06m ³ / h, cooker 0.2-0.4 m ³ / h, stove 0.3~0.7m ³ / h, water The boiling point is 1.5 to 6.0 m ³ / h, and the bath is 1.2 to 2.2 m ³ / h. On the other hand, the time that each appliance is continuously used ranges from about 10 hours like a stove to about 15-30 minutes at most like a water heater. Again, the approximate range is determined by the type of instrument. Therefore, for example, if a flow rate of 3 m ³ / h is measured as a whole, it is normally determined that the flow rate is a water heater. Therefore, when there is no change in flow rate and the flow rate is 15 to 30 minutes, it is normal. If the flow exceeds the minute, it is determined that the gas should be shut off because the device is not being used normally and an abnormality such as gas flowing out from the gas plug has occurred. Even if a flow rate of about 3 m ³ / h is measured, if fluctuations are observed in the flow rate, it means that other appliances have started use or have been stopped, and normal family life is being conducted. There is no need to judge and block.

If two or more instruments are used simultaneously, for example 2m 3 ^{/ h} two stoves bath pot and 0.5 m 3 / ^h of, when using a total of three instruments at the same time more than one hour, total flow rate Since the gas flow rate of ³ m ³ / h is measured, there is a possibility that it is judged to be abnormal use of the water heater and shut off. The gas appliance storage means of the control device stores in advance the gas consumption assumed for each gas appliance and the continuous use safety time. For example, the flow rate classification and the continuous use safety time in Table 1 are stored.

  The control device is connected to a flow rate measuring device 105, that is, a flow rate sensor, and measures the flow rate, but receives a transmission signal and calculates an average flow rate. Tracks how many minutes the average flow rate does not change and compares the flow rate of the individual appliances constituting the average flow rate with the predetermined duration for each flow rate category stored in advance in the control device 106 If it is over, it is determined to be abnormal use and a closing signal is issued to the emergency shut-off valve 104.

  It is assumed that the flow rate Q1 is measured at a certain time T1 when the gas is not flowing (the flow rate is zero). At this time, one instrument is used, the flow rate is determined as Q1, and Q1 is registered as the highest flow rate instrument flow rate in the instrument-specific gas flow rate storage means, and at the same time, measurement of the continuous use safety time is started. Next, at time T2, when an increase in the flow rate is measured and the increase amount is Q2, and Q1 <Q2, the control device 106 sets Q2 as the maximum instrument flow rate to the first place in the instrument-specific gas flow rate storage means. , Q1 is re-registered to the second place, and the continuous use safety time is again measured. Furthermore, it is assumed that the increase in flow rate is measured at time T3, the increase amount is Q3, and Q1 <Q3 <Q2. Similarly, Q2 is registered in the first place, Q3 in the second place, and Q1 in the third place in the gas flow rate storing means for each appliance, and the continuous use safety time is started again. Next, when the flow rate decrease is measured at time T4 and the changed flow rate is Q4, and Q3 <Q4 <Q2, the control device 106 determines that the instrument of the gas flow rate Q2 has stopped, and the gas flow storage means for each instrument. The Q1 is moved up to the first place and Q1 is moved up to the second place, and the measurement of the continuous use safety time is started.

  For example, from time T3 to T4, if the first-order flow rate Q2 is the corresponding continuous use safety time for each flow rate in Table 1 is 50 minutes, it is determined that there is an abnormality when 50 minutes elapse between time T3 and T4. Then, the emergency shut-off valve 104 operates.

Further, it can be confirmed that there is no transmission of a pulse signal for a certain period of time, and it is possible to constantly monitor the gas leakage state from the inner pipe. It distinguishes from phenomena during abnormal use of gas appliances by detecting changes in gas flow rate.
JP-A-61-59423

However, in the above-described conventional configuration, when the instrument is used, the flow rate is measured, the increased flow rate is registered in the gas flow storage unit for each instrument, and the continuous use safety time is measured and stored in the gas flow storage unit. Although it has a function to shut off the gas passage when the continuous use safe time corresponding to consumption is exceeded, when a gas leak occurs from the piping due to some trouble, for example, a water heater or a gas table is used. Then, the continuous use time is reset, there is a large leakage flow rate, but it is not shut off, the worst gas fills the room and there is a problem related to human life such as fire or explosion, and the gas is longer than the original monitoring time An instrument will be used, and there is a problem in terms of safety particularly when an instrument with a large flow rate is used.

  The present invention solves the above-mentioned problems, and continues to monitor leakage even after the start of use of the appliance, and in parallel detects the characteristics such as the flow rate of the appliance in use to identify and identify which appliance is being used. By providing specific monitoring at an early stage that the flow rate other than the appliance is leaked at the time of detection, a highly safe gas shut-off device is provided without being continuously used.

  In order to solve the above-mentioned conventional problems, the gas shut-off device of the present invention includes a first security judgment means for monitoring the flow rate and making an abnormality judgment, and a second security judgment means for making an equipment judgment from the usage flow rate pattern and making an abnormality judgment. A gas shut-off device for determining and monitoring abnormality in parallel, a flow rate detecting means for measuring a gas flow rate, a flow rate calculating means for calculating an instantaneous flow rate, and a flow rate storage for storing the obtained instantaneous flow rate in time series Means, average flow rate calculating means for obtaining an average flow rate from the obtained instantaneous flow rate value, and leakage flow determining means for monitoring whether the average flow rate obtained by the average flow rate computing means is less than a predetermined flow rate and detecting whether it is a leak flow rate; The first leakage determination means measures a leakage timer at the time of determination that the flow rate is equal to or higher than a predetermined flow rate, and first abnormal determination means for determining whether or not the predetermined time has been reached, and a flow rate pattern for each instrument are stored in advance. Storage means; A device estimation means for estimating the flow rate of the appliance by comparing the output signal of the flow rate storage means and the feature storage means, a leakage identification determination means for performing leakage judgment when the appliance estimation means is unexpected, and the first abnormality determination Means for shutting off the gas supply when the abnormality determination is established by the means and the leakage identification determination means, and a notification means for performing a warning display or a cutoff display at the time of determination of leakage from the first abnormality determination means or the leakage identification determination means. It is provided.

  According to the above invention, the flow rate is detected regardless of whether or not the instrument is used by the first security judgment means and monitored as having some flow rate, and at the same time, stored in the flow rate storage means by the second security judgment means. When the flow rate and the flow rate pattern stored in the feature storage unit are compared and determined by the device estimation unit, and it is determined that the flow rate is not other than the device or the leakage flow rate is not in the flow rate pattern of the device, the second is given priority over the first security determination unit. The safety identification means continues to monitor the leakage flow rate by the leak identification judgment means even if any device is used after that, and when a predetermined time elapses, a warning is sent to the notification means that there is a leak, or when the cutoff is set, the cutoff means is driven to turn off the gas. Since the supply of water is stopped, it is possible to prevent the malfunction that the usage time monitoring is canceled due to the use of the equipment and the leakage warning or leakage is not blocked even though there is inherent leakage. And it is possible to provide a highly safe gas cutoff apparatus.

  The gas shut-off device of the present invention is the first security judgment means, particularly the leakage flow judgment means, when the leakage flow rate is erroneously generated due to troubles in the gas piping or the gas appliance, or when the appliance starts to be used, the flow rate is detected and used. In addition to monitoring with the first abnormality determination means, the flow rate time-series signal is stored in parallel with the second safety determination means to determine the characteristics during the start / stop or control of the use of the appliance, and the flow rate of the appliance or the leakage flow rate is changed. If an estimation is made and it is determined that the leakage flow rate is not the appliance flow rate, then the leakage flow rate will continue to be monitored even if the use is stopped / started. As a result, it is possible to give priority to the use of large flow rate devices, delay leak warnings and shut off leaks, and prevent dangers such as gas poisoning and gas leak fires.

The present invention is a gas shut-off device that includes a first safety determination unit that monitors a flow rate and determines an abnormality, and a second safety determination unit that estimates an appliance based on a used flow rate pattern and performs an abnormality determination, and performs abnormality determination monitoring in parallel. A flow rate detecting means for measuring the gas flow rate, a flow rate calculating means for calculating the instantaneous flow rate, a flow rate storing means for storing the obtained instantaneous flow rate in time series, and an average for obtaining the average flow rate from the obtained instantaneous flow rate value. A flow rate calculation unit, a leakage flow rate determination unit that monitors whether the average flow rate obtained by the average flow rate calculation unit is less than a predetermined flow rate and detects whether or not it is a leakage flow rate; A first abnormality determination means for measuring a time leakage timer and determining whether or not a predetermined time has been reached, a feature storage means for storing a flow rate pattern for each instrument in advance, the flow storage means and the feature storage means Output signal Compared with the appliance estimation means for estimating the appliance flow rate, the leakage estimation determination means for performing leakage judgment when the appliance estimation means is unexpected, and the first abnormality determination means and the leakage identification determination means with the abnormality determination established gas It comprises a shut-off means for shutting off the supply, and a notifying means for performing a warning display or a shut-off display at the time of determination of leakage from the first abnormality judging means or the leak identification judging means.

  Then, if any flow rate is detected by the first security judgment means regardless of whether or not the appliance is used, it is monitored that there is a flow rate, and at the same time, the flow rate and feature memory stored in the flow rate storage means in the second security judgment means. When the flow rate pattern stored in the means is compared and determined by the appliance estimation means and it is determined that the flow rate pattern is not other than the appliance or the leakage flow rate is not in the flow rate pattern of the appliance, the second security judgment means is given priority over the first security judgment means. Even if any device is used after that, the leakage identification determination means continues to monitor the leakage flow rate, and when a predetermined time has elapsed, the warning means is notified that there is a leak, or when the cutoff is set, the cutoff means is driven and the gas supply is stopped. Therefore, it is possible to prevent the trouble that the usage time monitoring is canceled due to the use of the appliance and the leakage warning or the leakage is not blocked even though there is a leakage. All sex is high.

  Moreover, this invention is a program for making a computer perform all or one part of the means of the said gas interruption | blocking apparatus.

  And since it is a program, a part or all of the interruption | blocking apparatus of this invention can be easily implement | achieved using a microcomputer etc. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

(Embodiment 1)
FIG. 1 is a configuration diagram showing an installation mode of a gas cutoff device and a gas appliance in Embodiment 1 of the present invention, and FIG. 2 is a control block diagram of the gas cutoff device.

  A gas shut-off device 2 is installed at the inlet portion of the gas supply pipe 1 in each household, and branches to the place where various gas appliances to be used at home are installed by branching from the gas pipe 3 after passing through the gas shut-off device 2 Piped and supplied with gas. For example, a gas water heater 4 is installed outdoors, and hot water generated by the gas water heater 4 is installed in a kitchen hot water tap 5, a bath 6 in which a bathtub and a shower device are installed, a living room and the like through a water pipe. The floor heating 7 is supplied to form various usage forms. In addition, when indoors, gas is supplied to a gas table 8 installed in a kitchen, a gas fan heater 9 installed in a living room, a bedroom, or the like, and is used as needed.

  The gas shut-off device 2 is formed with a gas flow path having a gas inlet and a gas outlet, and includes a flow rate detecting means 10 for measuring the gas flow rate and a shut-off means 19 for shutting off the gas in the event of an abnormality. Note that there are various methods as the flow rate detection means 10, and an ultrasonic signal is transmitted from one to the other with a pair of ultrasonic sensors installed in the flow path shown in the present 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.

Therefore, the flow rate detection means 10 using an ultrasonic sensor will be briefly described. A first transmitter / receiver for transmitting or receiving ultrasonic waves and a second transmitter / receiver for receiving or transmitting ultrasonic waves are arranged to oppose the flow direction. The flow state of fluid such as gas is detected by switching. The flow rate is measured by processing signals from the first transceiver and the second transceiver, and ultrasonic waves are transmitted from upstream to downstream. And it receives with a 2nd transmitter / receiver, and measures by time-measurement means like a timer counter. An ultrasonic signal is transmitted from the downstream to the upstream by the switching means, and the propagation time is measured. Then, the flow rate calculation means 11 obtains the instantaneous flow rate from the ultrasonic propagation time difference between the first transmitter / receiver and the second transmitter / receiver in consideration of the size of the flow path and the fluid flow state. The instantaneous flow rate is obtained every predetermined period. And the instantaneous flow rate calculated | required with a predetermined period is input into the average flow calculating means 12, and a predetermined number of instantaneous flow rate values are collected and averaged, and it is calculated as an average flow rate.

Here, the first security determination means 13 includes a leakage flow rate determination means 14, a first abnormality determination means 15, and a monitor value storage means 16 connected to the average flow rate calculation means 12. The second security determination means 17 is based on the output signal of the flow rate calculation means 11, the flow rate storage means 18, the feature storage means 19, the instrument estimation means 20, the leakage identification determination means 21, the second abnormality determination means 22, Consists of.
The obtained average flow rate is input to the leakage flow rate determination means 14. The leakage flow rate determination means 14 determines whether or not the average flow rate is equal to or lower than the flow rate regarded as an instrument. In the case of a normal appliance flow rate, for example, when a customer uses the water heater 4, the flow rate value changes from zero to a predetermined flow rate, or the average obtained when the water heater 4 etc. is used while using a device such as a gas table. The flow rate is registered in a flow rate registration means (not shown) or the like, and becomes a usage time monitoring target.

  The monitoring value storage means 15 stores a leakage flow rate, a continuous use limit time corresponding to the flow rate range, a monitoring judgment value of the maximum use flow rate, or the like. For example, when the hose that supplies gas to a stove or the like is disconnected for some reason, an abnormally large flow rate is generated, but the total flow cutoff value for monitoring such a condition and the maximum use time of the appliance normally A monitoring value in which a use time cut-off time limit that defines a use time limit corresponding to a much longer use time is set is stored.

  Further, the obtained average flow rate is also input to the first abnormality determination means 16. By comparing and determining the set value of the monitoring value storage means 15 and the registered flow rate value, it is a leakage flow rate that cannot be regarded as an appliance flow rate above a predetermined flow rate, or whether the flow rate registered flow rate value exceeds the maximum usable flow rate value. Alternatively, it is determined whether or not the appliance use time exceeds the appliance continuous use time limit corresponding to the registered flow rate value. When an abnormality is determined by the first abnormality determination means 16, a cutoff signal is sent to the cutoff means 23 to stop the gas supply. In addition, the shut-off state and the shut-off content are displayed on the liquid crystal display element and the like, and the center that performs gas safety monitoring is notified through the notifying means 24 and the like.

  The obtained instantaneous flow rate is stored in the flow rate storage means 18 in time series. On the other hand, the feature storage means 19 stores in advance a time-series flow rate pattern of the instantaneous flow rate for each appliance. The appliance estimation means 20 compares the flow rate pattern stored in the flow rate storage means 18 in time series with the time series signal of the flow rate pattern stored in the feature storage means 19 to estimate which appliance has started to be used. At the same time, it is determined whether the leakage flow rate does not correspond to any appliance. For example, in the case of a leakage flow rate, there is no overshoot flow rate like an appliance, there is no control flow rate change, there is a feature that continues to flow at a constant flow rate, and the feature amount of the leakage flow rate is stored in advance in the feature storage means 19, It is estimated by the instrument estimation means 20.

And the output signal of the instrument estimation means 20 includes the leakage identification determination means 21 and the second abnormality determination means 22. The appliance monitoring value storage means 23 stores an abnormality determination value for each appliance. The second abnormality determination means 22 compares the appliance monitoring value with the estimated appliance and performs an abnormality determination for each appliance used. When the leakage flow rate is detected by the leakage identification determination means 21, a leakage signal is input and a large appliance flow rate is detected. Even if is detected, the leakage monitoring timer is started and leakage monitoring is performed. The first abnormality determination unit 16 and the second abnormality determination unit 22 perform abnormality determination in parallel. However, when the second abnormality determination unit 22 establishes abnormality monitoring such as a leakage timer start, the first abnormality determination is performed. An abnormality determination is performed in preference to the determination means 16, a stop signal is output to the interruption means 24 when an abnormality is established, and the gas supply is interrupted. In addition, the shut-off state and the shut-off content are displayed on the liquid crystal display element and the like, and the center that performs gas safety monitoring is notified through the notifying means 24 and the like.

  Next, the operation of the gas shut-off device configured as described above will be described. Gas appliances held at the customer's home, for example, the connection hose to the gas stove 9 is cracked for some reason, or the gas piping to the water heater 4 etc. is cracked for some reason, causing gas leakage The flow rate is detected by the flow rate detection means 10. 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 11 to be calculated as an instantaneous flow rate value. The average flow rate calculated from the flow rate is sent to the leakage flow rate determination means 14 and the first abnormality determination means 15.

  When a crack or the like enters a pipe, a very small flow rate flows, but the instantaneous flow rate detected and obtained by the flow rate detection means 10 is averaged, and the leakage flow rate determination means 14 has a flow rate value equal to or greater than a predetermined value (for example, 3 L / h). Monitor whether or not. When the leakage flow rate determination means 14 exceeds the predetermined flow rate, a signal with a flow rate is output to the first abnormality determination means 16, and the first abnormality determination means 16 starts counting the leakage timer and monitors whether a predetermined number of days has been exceeded. . On the other hand, the first abnormality determination means 16 obtains the flow rate of the appliance to be used based on the average flow rate obtained by the average flow rate computation means 12, and also performs continuous use time monitoring and the like.

  In other words, the first abnormality determination means 16 monitors the appliance in use by referring to the corresponding use time limit time in the monitor value storage means 15 with the set maximum flow rate value of the registered flow rate.

  In parallel, the instantaneous flow rate obtained by the flow rate calculation means 11 is stored in the flow rate storage means 18 in time series. The instrument estimation unit 20 is used from the time-series flow rate signal stored in the flow rate storage unit 18 using the flow rate pattern and the determination flow parameter stored in the feature storage unit 19 in time series in advance. Estimate the gas appliance that is. At this time, whether it is the hot water heater 4, the gas table 8, or the gas fan heater 9, based on the change in the rising flow rate of the appliance flow rate, the magnitude of the detected absolute flow rate value, the flow rate change pattern by the control inside the appliance, etc. Is estimated and determined, for example, is output to the leak identification determination means 21 and the second abnormality determination means 22 as a code signal of the instrument A, instrument B, instrument C, or the like.

  When a minute flow rate starts to flow when some cracks are generated in the pipe or the like, the appliance estimation means 20 compares the instantaneous flow rate time series signal of the flow rate storage means 18 with the appliance flow rate pattern of the feature storage means 19, for example, a correlation. When a device whose number falls within the predetermined range is not found, it is determined that the flow rate is other than the device, that is, the leakage flow rate, and the second abnormality determination unit 22 receives the leakage signal from the device estimation unit 20. Monitoring is started based on the leakage monitoring value of the appliance monitoring value storage means 23 based on the code signal (leakage) when the appliance cannot be specified. At the same time, a leakage identification signal is transmitted to the first abnormality determination means 16. When the first abnormality determination unit 16 receives the leakage identification signal, the abnormality determination continues, but the abnormality determination has priority over the second abnormality determination unit 22. That is, the monitoring by the first abnormality determination unit 16 and the instrument monitoring by the second abnormality determination unit 22 are performed in parallel, but when the leakage flow rate identification by the instrument estimation unit 20 is completed, the second abnormality determination unit 22 Anomaly monitoring is given priority. If leakage identification is completed even if the first abnormality determination unit 16 determines abnormality first, the second abnormality determination unit 22 performs priority determination, and a blocking signal is output to the blocking unit 24 when an abnormality is established. If the leak estimation becomes impossible by the instrument estimation means 20 on the way, a leak estimation impossible signal is output to the second abnormality determination means 22 and immediately transmitted to the first abnormality determination means 16, and the first abnormality determination means 16. Monitor the flow rate with.

In other words, when the flow rate is determined by the appliance estimation means 20 from the instantaneous flow rate determined by the flow rate calculation means 11, the hot water heater 4 is used and an abnormally large flow rate flows and is detected, and the first abnormality determination means 16 is detected. Even when the flow rate monitoring of the water heater 4 is started, the second abnormality determination means 22 further performs the water heater 4
Even if the instrument flow rate monitoring is started, the leakage abnormality time monitoring after the leakage identification is continuously performed in parallel. In other words, even if a flow rate due to the use of an appliance greater than the actual leakage flow rate occurs, even if the usage time monitoring of the appliance is started, a warning display based on the leakage identification can be reliably displayed on the notification means 25. You can also notify the operator's center. On the other hand, when the leakage cutoff is set, the cutoff means 24 can be driven to stop the gas supply.

  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 first security judgment means 13 and the second security judgment means 17 monitor the appliances used in parallel, and when the second security judgment means 17 establishes the equipment estimation, the first security judgment means. Since the leak identification completion signal is output to 13 and the instrument is monitored by the second security judging means 17, safety is ensured by ensuring an appropriate use restriction function corresponding to the leak without being affected by the flow rate change of the instrument used. It is possible to provide a gas shut-off device that is secured and easy to use.

  As described above, the gas shutoff device according to the present invention can appropriately ensure the safety monitoring of the appliances used, and prevents the occurrence of explosion accidents and poisoning accidents due to city gas, propane gas, hydrogen gas, etc. It can be applied to all equipment monitoring devices.

The block diagram which shows the installation mode of the gas cutoff device and gas appliance in Embodiment 1 of this invention Control block diagram of the gas shutoff device Configuration diagram of conventional gas shut-off device

DESCRIPTION OF SYMBOLS 10 Flow rate detection means 11 Flow rate calculation means 12 Average flow rate calculation means 13 1st safety | security determination means 14 Leakage flow rate determination means 15 1st abnormality determination means 16 Monitoring value memory | storage means 17 2nd safety | security determination means 18 Flow volume storage means 19 Features Storage means 20 Appliance estimation means 21 Leakage identification determination means 22 Blocking means 23 Notification means

Claims (2)

A gas shut-off device comprising a first safety judgment means for monitoring a flow rate and judging an abnormality and a second safety judgment means for estimating an instrument based on a used flow rate pattern and judging the abnormality and monitoring the abnormality in parallel. A flow rate detecting means for measuring the flow rate, a flow rate calculating means for calculating the instantaneous flow rate, a flow rate storing means for storing the obtained instantaneous flow rate in time series, and an average flow rate calculating means for obtaining the average flow rate from the obtained instantaneous flow rate value, A leakage flow determination unit that monitors whether the average flow rate calculated by the average flow rate calculation unit is less than a predetermined flow rate and detects whether the flow rate is a leakage flow rate; The first abnormality determination means for measuring whether or not the predetermined time has been reached is measured, the characteristic storage means for storing the flow rate pattern for each instrument in advance, and the output signals of the flow storage means and the characteristic storage means are compared. Equipment Appliance estimation means for estimating the amount, leakage identification determination means for performing leakage judgment when the instrument estimation means is unexpected, and gas supply when abnormality determination is established by the first abnormality determination means and leakage identification determination means A gas shut-off device comprising: a shut-off means for performing a warning display or a shut-off display at the time of judgment of leakage from the first abnormality judging means or the leak identification judging means. A program for causing a computer to function as all or part of means of the gas shut-off device according to claim 1.