JP3837989B2 - Gas shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas shut-off device that ensures the safety of gas use when using gas after a gas meter.
[0002]
[Prior art]
Conventionally, in this type of gas shut-off device, as shown in FIG. 7, the gas flow input means 1 rotates the wind turbine by the gas flow in the gas passage, detects the rotation of the wind turbine, and outputs the gas flow signal A. When the flow rate determination unit 2 receives the gas flow signal A from the gas flow input unit 1, it outputs a flow rate sensor drive signal B, and when the flow rate input unit 3 receives the flow rate sensor drive signal B of the flow rate determination unit 2. When the flow rate of the gas flowing in the gas passage is measured and the flow rate signal C is output, the abnormal flow rate determination unit 4 receives the flow rate signal C of the flow rate input means 3 and compares it with the previously determined abnormal flow rate determination value. If the above flow rate signal C is present, the valve drive permission signal D and the alarm notification signal F are output. When the valve drive unit 5 receives the valve drive permission signal D from the abnormal flow rate determination unit 4, the valve drive signal 5 outputs the valve close signal E. 6 receives the valve closing signal E of the valve drive 5 When the gas passage is closed and the pointer value calculation unit 11 receives the flow rate signal C of the flow rate input means 3, the gas flow rate is calculated and then summed up to output the pointer value H, and the pointer value holding unit 12 receives the pointer value H. Holding the pointer value H, the external notification means 7 receives the alarm notification signal F from the abnormal flow rate determination unit 4 and notifies the outside to the center that monitors the gas shut-off device using, for example, a public telephone line. However, when there is a pointer value communication request from the outside, the pointer value H of the pointer value holding unit 12 is notified.
[0003]
[Problems to be solved by the invention]
However, in the conventional gas shut-off device, for example, even if there is no gas flow rate, the flow rate sensor is driven and the battery is consumed when the flow rate input means is driven periodically (for example, every 5 seconds) to detect whether there is really a gas flow rate. Therefore, in order to drive the flow rate input means only when there is a gas flow in the gas passage, the mechanism of the gas flow input means that can detect the presence or absence of the gas flow is provided. If this gas flow input means fails, the flow rate sensor drive signal is not output, so the flow rate input means is not driven, and the gas flow rate cannot be measured. It was supposed to be impossible to measure the gas flow rate by simply outputting
[0004]
Therefore, in the unlikely event that the gas flow input means or flow rate input means fails, the guideline value is not increased by the guideline value communication performed once a month, that is, the guideline value of the gas shut-off device If the gas does not increase, either no gas is being used at all, or there is an abnormality in the gas flow input means and the flow rate input means of the gas shut-off device. Although the observer had determined, there was a problem that there was a possibility of overlooking the failure or not being able to be detected early.
[0005]
[Means for Solving the Problems]
The present invention includes a gas flow input means for detecting a gas flow in a gas passage and outputting a gas flow signal, and a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means. And a flow rate input means for measuring the flow rate of the gas flowing in the gas passage upon receiving the flow rate sensor drive signal of the flow rate presence / absence determining unit and outputting the flow rate signal; and holding the flow rate signal of the flow rate input means in advance. An abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal if there is a flow rate signal that is equal to or higher than the abnormal flow rate determination value compared to the abnormal flow rate determination value, and the valve drive permission of the abnormal flow rate determination unit A valve driving unit that outputs a valve closing signal when receiving the signal, a valve that closes the gas passage when receiving the valve closing signal of the valve driving unit, and the alarm notification signal of the abnormal flow rate determining unit. Then, external notification means for notifying the outside is provided, and when the flow rate sensor drive signal of the flow rate presence / absence determining unit is received, the presence / absence of the flow rate signal of the flow rate input means is determined a plurality of times and there is no flow rate signal. The valve drive unit is provided with a flow rate contradiction determining unit that outputs the valve drive permission signal and the alarm notification signal to the external notification unit.
[0006]
According to the present invention, the failure of the gas flow input means and the flow rate input means can be detected mutually and automatically.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal, a flow rate presence / absence determining unit for outputting a flow sensor driving signal when receiving a gas flow signal from the gas flow input means, and a flow rate presence / absence determining unit When the flow sensor drive signal is received, the flow rate input means that measures the flow rate of the gas flowing in the gas passage and outputs the flow signal, and when the flow rate signal of the flow rate input means is received, it is compared with the abnormal flow judgment value that is held in advance. An abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal if there is a flow rate signal equal to or higher than a flow rate determination value; a valve drive unit that outputs a valve closing signal when receiving the valve drive permission signal of the abnormal flow rate determination unit; A valve that closes the gas passage when receiving a valve closing signal of the valve drive unit, an external notification means that notifies the outside when an alarm notification signal of the abnormal flow rate determination unit is received, and a flow rate sensor drive of the flow rate presence / absence determination unit When the signal is received, the flow rate input means has a flow rate discriminating unit that determines the presence or absence of the flow rate signal multiple times, and if there is no flow rate signal, the valve drive permission signal is output to the valve drive unit and the alarm notification signal is output to the external notification means. is there.
[0008]
Further, a gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal, a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means, and a flow rate presence / absence determination When the flow sensor drive signal is received, the flow rate input means that measures the flow rate of the gas flowing in the gas passage and outputs the flow rate signal, and when the flow rate signal of the flow rate input means is received, it is compared with the abnormal flow rate judgment value that is held in advance. An abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal if there is a flow rate signal equal to or higher than an abnormal flow rate determination value; and a valve drive unit that outputs a valve closing signal when receiving the valve drive permission signal of the abnormal flow rate determination unit; The valve that closes the gas passage when receiving the valve closing signal of the valve driving unit, the external notification means for notifying the outside when receiving the alarm notification signal of the abnormal flow determination unit, and the flow rate signal of the flow rate input means If there is no gas flow signal, the flow inconsistency determination unit outputs a valve drive permission signal to the valve drive unit and an alarm notification signal to the external notification unit if there is no gas flow signal. A forced drive timer unit for outputting a flow rate sensor drive signal to the valve drive unit when the flow rate signal of the input means is interrupted for a certain period.
[0009]
Further, a gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal, a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means, and a flow rate presence / absence determination When the flow sensor drive signal is received, the flow rate input means that measures the flow rate of the gas flowing in the gas passage and outputs the flow rate signal, and when the flow rate signal of the flow rate input means is received, it is compared with the abnormal flow rate judgment value that is held in advance. An abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal if there is a flow rate signal equal to or higher than an abnormal flow rate determination value; and a valve drive unit that outputs a valve closing signal when receiving the valve drive permission signal of the abnormal flow rate determination unit; A valve that closes the gas passage when receiving the valve closing signal of the valve drive unit, an external notification means that notifies the outside when an alarm notification signal of the abnormal flow rate determination unit is received, and a flow rate signal of the flow rate input means When the gas flow signal is received, the presence or absence of the gas flow signal of the gas flow input means is determined a plurality of times, and if there is no gas flow signal, the periodic drive start signal and the flow rate contradiction determination unit that outputs an alarm notification signal to the external notification means, and the flow rate signal of the flow rate input means A forced drive timer unit that outputs a flow rate sensor drive signal to the valve drive unit when it is interrupted for a certain period, and a periodic output that periodically outputs a flow rate sensor drive signal to the valve drive unit when it receives a periodic drive start signal of the flow rate contradiction determination unit And a drive instructing unit.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
Example 1
FIG. 1 is a functional block diagram of a gas cutoff device according to Embodiment 1 of the present invention. FIG. 2 is a program flow diagram of the first embodiment.
[0012]
In FIG. 1, the gas flow input means 1 rotates a windmill by the gas flow in the gas passage and detects the rotation of the windmill (attaching a magnet to the windmill and detecting the rotation of the windmill with a reed switch) to generate the gas flow. For example, the gas flow signal A is output (or the same effect can be obtained even if the rotation of the wind turbine shaft directly connected to the wind turbine is detected by the micro switch).
[0013]
When the flow rate presence / absence determining unit 2 receives the gas flow signal A from the gas flow input means 1, it outputs a flow rate sensor drive signal B. When the flow rate input means 3 receives the flow rate sensor drive signal B from the flow rate presence / absence determining unit 2, the flow rate sensor can accurately measure the flow rate of the gas flowing in the gas passage (for example, irradiating an ultrasonic wave to determine the difference in how sound is transmitted depending on the flow velocity). Measure by driving an ultrasonic sensor that measures by detecting, or a flow sensor that detects and measures the temperature drop by changing the resistance value of the element when the gas flow hits the element heated by the heater) A flow rate signal C is output in proportion to the gas flow rate.
[0014]
When the abnormal flow rate determination unit 4 receives the flow rate signal C from the flow rate input means 3, it calculates the flow rate from the flow rate signal C and holds it in advance (for example, the maximum gas flow rate value allowed by the gas shut-off device). If there is a flow rate signal C that is equal to or higher than the abnormal flow rate determination value, a valve drive permission signal D and an alarm notification signal F are output.
[0015]
When the valve drive unit 5 receives the valve drive permission signal D from the abnormal flow rate determination unit 4, it outputs a valve close signal E. When the valve 6 receives the valve closing signal E from the valve driving unit 5, the valve 6 drives the valve to close the gas passage.
[0016]
When the external notification means 7 receives the alarm notification signal F from the abnormal flow rate determination unit 4, the external notification means 7 notifies the outside to the center that is monitoring the gas shutoff device using a public communication line such as a telephone.
[0017]
When the flow rate contradiction determining unit 8 receives the flow rate sensor drive signal B of the flow rate presence / absence determining unit 2, the flow rate signal C of the flow rate input means 3 determines the presence / absence of the gas flow multiple times (total number of times since the gas shut-off device is turned on). (Although it may be a plurality of consecutive times) (or the same effect can be obtained even if the presence / absence of the gas flow rate is determined again after elapse of a certain time) and if there is no gas flow rate, the gas flow input means 1 It is assumed that the gas flow rate is flowing even though no gas is flowing in the gas passage, or the flow rate input means 3 has the gas flow rate though the gas is flowing in the gas passage. If it is determined that the gas flow input means 1 or the flow rate input means 3 is out of order, the valve drive permission signal D is sent to the valve drive unit 5 and the alarm notification signal F is sent to the external notification means 7. output That.
[0018]
Next, the operation and action will be described. FIG. 2 shows a program flow of the above means from process T1 to process T8. Now, it is assumed that the flow from the start to the end of processing is periodically processed by an interval calendar or the like.
[0019]
In the gas flow input means 1, the process T1 detects the gas flow in the gas passage replaced with the rotation of a windmill or the like, and if there is a gas flow, outputs a gas flow signal and proceeds to the process T2. In the flow rate presence / absence determining unit 2, the process T2 determines the presence or absence of a gas flow signal. If there is a gas flow signal, the process proceeds to the process T3, and if there is no gas flow signal, the process ends.
[0020]
In the flow rate input means 3, the process T3 drives a flow rate sensor that can accurately measure the flow rate of the gas flowing in the gas passage such as an ultrasonic sensor, and if there is a gas flow rate, outputs a flow rate signal and proceeds to the process T4. If not, the process proceeds to process T8.
[0021]
In the abnormal flow rate determination unit 4, the process T4 calculates the actual flow rate flowing in the gas passage from the flow rate signal and holds the abnormal flow rate determination value (for example, the maximum gas flow rate value allowed by the gas shut-off device) that is held in advance. If the comparison is greater than or equal to the abnormal flow rate determination value, the process proceeds to process T5, and if it is less than the abnormal flow rate determination value, the process ends.
[0022]
In the valve drive unit 5, the process T5 outputs a drive output to the valve 6 and proceeds to the process T6. In the valve 6, the process T6 closes the gas passage and proceeds to the process T7.
[0023]
In the external notification means 7, the process T7 notifies the center monitoring the gas shut-off device using a public communication line such as a telephone and terminates the process.
[0024]
In the flow rate contradiction determining unit 8, it is determined that the process T8 is a plurality of times (for example, a total of 20 times or 3 times may be continued). If the specified number of times has been reached, the process proceeds to step T5 and the specified number of times has not been reached. The process ends.
[0025]
(Example 2)
FIG. 3 is a functional block diagram of the gas shutoff device according to Embodiment 2 of the present invention. FIG. 4 is a program flow diagram of the second embodiment.
[0026]
In FIG. 3, the gas flow input means 1 rotates the windmill by the gas flow in the gas passage and detects the rotation of the windmill (attaching a magnet to the windmill and detecting the rotation of the windmill with a reed switch) to generate the gas flow. For example, the gas flow signal A is output (or the same effect can be obtained even if the rotation of the wind turbine shaft directly connected to the wind turbine is detected by the micro switch).
[0027]
When the flow rate presence / absence determining unit 2 receives the gas flow signal A from the gas flow input means 1, it outputs a flow rate sensor drive signal B. When the flow rate input means 3 receives the flow rate sensor drive signal B from the flow rate presence / absence determining unit 2, the flow rate sensor can accurately measure the flow rate of the gas flowing in the gas passage (for example, irradiating an ultrasonic wave to determine the difference in how sound is transmitted depending on the flow velocity). Measure by driving an ultrasonic sensor that measures by detecting, or a flow sensor that detects and measures the temperature drop by changing the resistance value of the element when the gas flow hits the element heated by the heater) A flow rate signal C is output in proportion to the gas flow rate.
[0028]
When the abnormal flow rate determination unit 4 receives the flow rate signal C from the flow rate input means 3, it calculates the flow rate from the flow rate signal C and holds it in advance (for example, the maximum gas flow rate value allowed by the gas shut-off device). If there is a flow rate signal C that is equal to or higher than the abnormal flow rate determination value, a valve drive permission signal D and an alarm notification signal F are output.
[0029]
When the valve drive unit 5 receives the valve drive permission signal D from the abnormal flow rate determination unit 4, it outputs a valve close signal E. When the valve 6 receives the valve closing signal E from the valve driving unit 5, the valve 6 drives the valve to close the gas passage.
[0030]
When the external notification means 7 receives the alarm notification signal F from the abnormal flow rate determination unit 4, the external notification means 7 notifies the outside to the center that is monitoring the gas shutoff device using a public communication line such as a telephone.
[0031]
When the flow rate contradiction determination unit 8 receives the gas flow rate from the flow rate signal C of the flow rate input unit 3, the same effect can be obtained by the gas flow signal A of the gas flow input unit 1 (or the flow rate sensor drive signal B of the flow rate determination unit 2). ) Multiple times (may be the total number of times since the power supply to the gas shut-off device is turned on, or may be the number of continuous times), and if there is no gas flow signal A, the gas flow input means 1 has gas in the gas passage. It is determined that the gas flow rate is not flowing even though the gas flow is flowing, that is, it is determined that the gas flow input means 1 has failed, and the valve drive permission signal D and external notification are sent to the valve drive unit 5. An alarm notification signal F is output to the means 7.
[0032]
The forced drive timer unit 9 monitors the flow rate signal C of the flow rate input means 3 and outputs a flow rate sensor drive signal B to the valve drive unit 5 when it is interrupted for a certain period (for example, 24 hours).
[0033]
Next, a specific description of operation and action will be given with reference to FIG.
[0034]
FIG. 4 shows a program flow of the above means from process T10 to process T22.
[0035]
Now, it is assumed that the flow from the start to the end of processing is periodically processed by an interval calendar or the like.
[0036]
In the forced drive timer unit 9, the process T10 determines whether or not a certain period of time has elapsed (for example, 24 hours). If it has elapsed, the process proceeds to process T11, and if not, the process proceeds to process T19.
[0037]
In the flow rate input means 3, the process T11 drives a flow rate sensor that can accurately measure the flow rate of gas flowing in the gas passage such as an ultrasonic sensor, and if there is a gas flow rate, outputs a flow rate signal and proceeds to the process T12. If there is no, the process ends.
[0038]
In process T12 in the gas flow input means 1, the gas flow in the gas passage is detected by replacing it with the rotation of a windmill, etc., and if there is a gas flow, a gas flow signal is output and the process proceeds to process T13. In the flow rate presence / absence determining unit 2, the process T13 determines the presence or absence of a gas flow signal. If there is a gas flow signal, the process proceeds to process T14, and if there is no gas flow signal, the process proceeds to process T22. In process T14, the flow rate monitoring timer is cleared and the process proceeds to process T15.
[0039]
In the abnormal flow rate determination unit 4, the process T15 calculates the actual flow rate flowing in the gas passage from the flow rate signal, and stores the abnormal flow rate determination value (for example, the maximum gas flow rate value permitted by the gas shut-off device) that is held in advance. If the comparison is greater than or equal to the abnormal flow rate determination value, the process proceeds to process T16, and if it is less than the abnormal flow rate determination value, the process ends.
[0040]
In the valve drive unit 5, process T16 outputs a drive output to the valve 6 and proceeds to process T17. In the valve 6, the process T17 closes the gas passage and proceeds to the process T18.
[0041]
In the external notification means 7, the process T18 notifies the center that is monitoring the gas shutoff device using a public communication line such as a telephone and ends the process.
[0042]
In process T19 in the gas flow input means 1, the gas flow in the gas passage is detected by replacing it with the rotation of a windmill or the like, and if there is a gas flow, a gas flow signal is output and the process proceeds to process T20. In the flow rate presence / absence determining unit 2, the process T20 determines the presence or absence of a gas flow signal. If there is a gas flow signal, the process proceeds to the process T21, and if there is no gas flow signal, the process ends.
[0043]
In the flow rate input means 3, the process T21 drives the flow sensor to output a flow rate signal if there is a gas flow rate and proceeds to process T14, and if there is no gas flow rate, it proceeds to process T22.
[0044]
In the flow rate contradiction determining unit 8, it is determined that the process T22 is a plurality of times (for example, a total of 20 times or 3 times may be continued). If the specified number of times has been reached, the process proceeds to step T16 and the specified number of times has not been reached. The process ends.
[0045]
Example 3
FIG. 5 is a functional block diagram of the gas cutoff device according to Embodiment 3 of the present invention. FIG. 6 is a program flow diagram of the third embodiment.
[0046]
In FIG. 5, the gas flow input means 1 rotates the wind turbine by the gas flow in the gas passage and detects the rotation of the wind turbine (a magnet is attached to the wind turbine and the rotation of the wind turbine is detected by a reed switch). For example, the gas flow signal A is output (or the same effect can be obtained even if the rotation of the wind turbine shaft directly connected to the wind turbine is detected by the micro switch).
[0047]
When the flow rate presence / absence determining unit 2 receives the gas flow signal A from the gas flow input means 1, it outputs a flow rate sensor drive signal B. When the flow rate input means 3 receives the flow rate sensor drive signal B from the flow rate presence / absence determining unit 2, the flow rate sensor can accurately measure the flow rate of the gas flowing in the gas passage (for example, irradiating an ultrasonic wave to determine the difference in how sound is transmitted depending on the flow velocity). Measure by driving an ultrasonic sensor that measures by detecting, or a flow sensor that detects and measures the temperature drop by changing the resistance value of the element when the gas flow hits the element heated by the heater) A flow rate signal C is output in proportion to the gas flow rate.
[0048]
When the abnormal flow rate determination unit 4 receives the flow rate signal C from the flow rate input means 3, it calculates the flow rate from the flow rate signal C and holds it in advance (for example, the maximum gas flow rate value allowed by the gas shut-off device). If there is a flow rate signal C that is equal to or higher than the abnormal flow rate determination value, a valve drive permission signal D and an alarm notification signal F are output.
[0049]
When the valve drive unit 5 receives the valve drive permission signal D from the abnormal flow rate determination unit 4, it outputs a valve close signal E. When the valve 6 receives the valve closing signal E from the valve driving unit 5, the valve 6 drives the valve to close the gas passage.
[0050]
When the external notification means 7 receives the alarm notification signal F from the abnormal flow rate determination unit 4, the external notification means 7 notifies the outside to the center that is monitoring the gas shutoff device using a public communication line such as a telephone.
[0051]
When the flow rate contradiction determination unit 8 receives the gas flow rate from the flow rate signal C of the flow rate input unit 3, the same effect can be obtained by the gas flow signal A of the gas flow input unit 1 (or the flow rate sensor drive signal B of the flow rate determination unit 2). ) Multiple times (may be the total number of times since the power supply to the gas shut-off device is turned on, or may be the number of continuous times), and if there is no gas flow signal A, the gas flow input means 1 has gas in the gas passage. Although it is erroneously determined that the gas flow rate is not flowing even though the gas flow is flowing, that is, it is determined that the gas flow input means 1 is out of order, and the periodic drive start signal G and the external notification means 7 are notified of the alarm. The signal F is output.
[0052]
The forced drive timer unit 9 monitors the flow rate signal C of the flow rate input means 3 and outputs a flow rate sensor drive signal B to the flow rate input means 3 when it is interrupted for a certain period (for example, 24 hours).
[0053]
When the regular drive instructing unit 10 receives the regular drive start signal G from the flow rate contradiction determining unit 9, the regular drive instructing unit 10 outputs the flow sensor drive signal B to the flow rate input means 3 periodically (for example, every 5 seconds).
[0054]
Next, a specific description of the operation and action will be given with reference to FIG.
[0055]
FIG. 6 shows a program flow of the above means from process T10 to process T24. In addition, the thing of the same code | symbol as Example 2 has the same structure, and abbreviate | omits description.
[0056]
However, it is determined that the process T22 is a plurality of times, and if the predetermined value is reached, the process proceeds to process T24.
[0057]
Now, it is assumed that the flow from the start to the end of processing is periodically processed by an interval calendar or the like.
[0058]
The difference from the third embodiment is that the periodic drive instructing unit 10 determines whether or not the process T23 is in the periodical drive. If the periodical drive is being performed, the process proceeds to the process T21. In process T24, regular driving is started and the process proceeds to process T18.
[0059]
【The invention's effect】
As described above, according to the first aspect of the present invention, the failure of the gas flow input means and the flow rate input means can be detected mutually and automatically. Furthermore, until now, the failure of the gas flow input means and flow rate input means could only be found by monitoring the guideline values of the monitoring personnel who are monitoring the gas shut-off device, but the judgment of the monitoring personnel should not be required. This can eliminate the possibility of being overlooked and improve the maintainability of the gas shut-off device. In addition, since the gas flow input means and the flow rate input means have failed, the gas flow path cannot be detected because the gas flow rate cannot be detected even though an abnormal flow rate is flowing. By closing the plug, it is possible to prevent gas accidents and to protect the life and property of the gas user.
[0060]
According to the second aspect of the present invention, the gas flow input means is out of order and the flow rate input means cannot be driven and the gas flow rate cannot be detected, that is, the failure cannot be determined. By detecting that the flow rate does not flow for a certain period and forcibly driving the flow rate input unit, a failure of the gas flow input unit can be detected. As a result, as in the first aspect of the present invention, it is possible to improve the maintainability of the gas shut-off device and to close the gas passage, thereby preventing a gas accident in advance and having the advantageous effect of protecting the life and property of the gas user. .
[0061]
Furthermore, according to the invention of claim 3, the gas flow rate can be detected by periodically driving the flow rate input means instead of closing the gas passage, so that the failure of the gas flow input means (the gas shut-off device is It is possible to use gas from the time when the gas shut-off device is replaced by external communication to the monitoring center) until the gas shut-off device is replaced. There is an advantageous effect that it is possible to achieve both failure detection and convenience without stopping the gas supply to the gas user who is doing business using the.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a gas shut-off device according to Embodiment 1 of the present invention. FIG. 2 is a program flowchart of the device. FIG. 3 is a functional block diagram of a gas shut-off device according to Embodiment 2 of the present invention. FIG. 5 is a functional block diagram of a gas shut-off device according to a third embodiment of the present invention. FIG. 6 is a program flowchart of the device. FIG. 7 is a functional block diagram of a conventional gas shut-off device.
DESCRIPTION OF SYMBOLS 1 Gas flow input means 2 Flow rate presence determination part 3 Flow rate input means 4 Abnormal flow rate determination part 5 Valve drive part 6 Valve 7 External notification part 8 Flow rate contradiction determination part 9 Forced drive timer part 10 Periodic drive instruction part 11 Pointer value calculation part 12 Pointer value holding section

Claims (3)

A gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal; a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means; The flow rate input means for measuring the flow rate of the gas flowing in the gas passage upon receiving the flow rate sensor drive signal of the presence / absence determining unit and outputting the flow rate signal, and the abnormal flow rate retained in advance when the flow rate signal of the flow rate input means is received When there is a flow rate signal that is equal to or higher than the determination value and the abnormal flow rate determination value, an abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal, and when the valve drive permission signal of the abnormal flow rate determination unit is received, the valve A valve driving unit that outputs a closing signal; a valve that closes a gas passage when the valve closing signal of the valve driving unit is received; and an alarm notification signal of the abnormal flow rate determination unit that is externally changed. When the flow rate sensor drive signal of the flow rate presence / absence determining unit is received, the presence / absence of the flow rate signal of the flow rate input unit is determined a plurality of times, and if there is no flow rate signal, the valve drive unit A gas shut-off device comprising a drive permission signal and a flow rate contradiction determining unit that outputs the alarm notification signal to the external notification means. A gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal; a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means; The flow rate input means for measuring the flow rate of the gas flowing in the gas passage upon receiving the flow rate sensor drive signal of the presence / absence determining unit and outputting the flow rate signal, and the abnormal flow rate retained in advance when the flow rate signal of the flow rate input means is received When there is a flow rate signal that is equal to or higher than the determination value and the abnormal flow rate determination value, an abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal, and when the valve drive permission signal of the abnormal flow rate determination unit is received, the valve A valve driving unit that outputs a closing signal; a valve that closes a gas passage when the valve closing signal of the valve driving unit is received; and an alarm notification signal of the abnormal flow rate determination unit that is externally changed. When the flow rate signal of the flow rate input means is received, the presence or absence of the gas flow signal of the gas flow input means is determined a plurality of times, and if there is no gas flow signal, the valve drive unit A flow permission discriminating unit that outputs the alarm notification signal to the drive permission signal and the external notification unit; and a compulsory output of the flow sensor drive signal to the flow rate input unit when the flow rate signal of the flow rate input unit is interrupted for a certain period of time A gas shut-off device comprising a drive timer unit. A gas flow input means for detecting a gas flow in the gas passage and outputting a gas flow signal; a flow rate presence / absence determining unit for outputting a flow sensor driving signal upon receiving the gas flow signal from the gas flow input means; The flow rate input means for measuring the flow rate of the gas flowing in the gas passage upon receiving the flow rate sensor drive signal of the presence / absence determining unit and outputting the flow rate signal, and the abnormal flow rate retained in advance when the flow rate signal of the flow rate input means is received When there is a flow rate signal that is equal to or higher than the determination value and the abnormal flow rate determination value, an abnormal flow rate determination unit that outputs a valve drive permission signal and an alarm notification signal, and when the valve drive permission signal of the abnormal flow rate determination unit is received, the valve A valve driving unit that outputs a closing signal; a valve that closes a gas passage when the valve closing signal of the valve driving unit is received; and an alarm notification signal of the abnormal flow rate determination unit that is externally changed. When receiving the flow rate signal of the flow rate input means, the presence / absence of the gas flow signal of the gas flow input means is determined a plurality of times, and if there is no gas flow signal, a periodic drive start signal and the external A flow rate contradiction determination unit that outputs the alarm notification signal to the notification unit, a forced drive timer unit that outputs the flow rate sensor drive signal to the flow rate input unit when the flow rate signal of the flow rate input unit is interrupted for a certain period, and A gas shut-off device comprising: a periodic drive instructing unit that periodically outputs the flow sensor drive signal to the flow rate input means when receiving the periodic drive start signal of the flow rate contradiction determining unit.

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