JP3668980B2 - Gas shut-off device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a gas shut-off device that prevents a gas accident in advance.
[0002]
[Prior art]
Conventionally, in this type of gas shut-off device, in FIG. 6, 2 is a shut-off valve for opening and closing a gas passage, 1 is a flow rate measuring means for measuring a flow rate corresponding to the passing gas flow rate, and 3 is for driving the shut-off valve 2 to open and close. A drive unit, 4 is a gas meter to which the shut-off valve 2 and the flow rate measuring means 1 are attached, 7 is a seismic sensor that detects earthquake vibration, 8 is a pressure sensor that detects a pressure drop in the gas pipe, and 9 is an alarm. An external input terminal for inputting an abnormal signal from an external device such as a vessel, 12 is an LED as a notification means for notifying the outside that the gas passage has been blocked, and 13 is an external return for instructing the opening of the shut-off valve 2 from the outside. The switch 30 as a means is driven when there is an abnormality in the gas flow rate by the flow measurement means 1, or when there is an abnormality signal from the external input terminal 9 from an external device such as the seismic sensor 7, pressure sensor 8, alarm device or the like. Operate part 3 The shut-off control unit which opens the shut-off valve 2 by driving the drive unit 3 by a signal from the external return means (switch) while closing the gas shut-off valve 2 to shut off the gas passage and displaying the LED (notification means 12) It is.
[0003]
The control unit 30 operates the driving unit 3 and closes the shut-off valve 2 when there is an abnormality in the gas flow rate by the flow rate measuring means 1 or when there is an abnormality signal from the seismic sensor 7, pressure sensor 8, or external input terminal 9. It operates and notifies to the outside by LED (notification means 12). After seeing this LED (indication on the notification means 12) and a person in the household using the gas confirming an abnormality, the switch (external return means 13) is pressed to return the shutoff valve 2 so that the gas can be used. It was.
[0004]
[Problems to be solved by the invention]
However, since such a gas shut-off device only shuts off the shut-off valve 2 and gives notification by the notification means 12, for example, when the gas passage is shut off due to an impact or the like, it is difficult to notice until the household person uses the gas. Moreover, even if it was noticed, it was necessary to push the switch (external return means 13) to the place where the gas meter was installed. In addition, when the shutoff valves 2 of each household in the area are closed at the same time due to an earthquake, etc., it is necessary to explain how to return the shutoff valve 2 to each household. Then, after confirming safety, it was necessary to go to push the switch (external return means 13).
[0005]
The gas shut-off device of the present invention aims to reduce the human valve opening work by automatically opening the valve while keeping safety at the time of shut-off.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a gas shutoff device according to the present invention comprises a flow rate measuring means for measuring a flow rate corresponding to a passing gas flow rate, a shutoff valve for opening and closing a gas passage, and a drive unit for opening and closing the shutoff valve. An abnormal sensor in the gas flow rate, a pressure sensor for detecting a pressure drop in the gas pipe, an external input terminal for inputting an abnormal signal from an external device, and the flow rate measuring means. When there is an abnormal signal from the seismic sensor, the pressure sensor, or the external input terminal, the control unit that operates the drive unit to close the shut-off valve and shuts off the gas passage, and the shut-off valve An impact detection means for detecting an operation when there is no drive signal and outputting an impact signal; and an open / closed state of the shut-off valve is detected by the impact signal from the impact detection means, and if it is closed, a return is required. An open / close state detection unit that outputs a signal, and the drive unit is operated by a return request signal from the open / close state detection unit to open the shut-off valve to open the gas passage, and then the gas flow rate is measured by the flow rate measuring unit for a predetermined period. It is monitored whether there is any leakage, whether there is a return abnormality signal from the seismic sensor, pressure sensor, or external input terminal. If there is an abnormality, the shut-off valve is closed to shut off the gas passage. For example, an automatic return unit that sends an opening operation completion signal to the control unit after a predetermined period has elapsed.
[0008]
[Action]
With the above configuration, the gas shut-off device of the present invention opens the shut-off valve after a predetermined period if the shut-off valve is closed by an impact or the like, and is detected by the impact detection unit and the open / closed state detection unit and is safe at the automatic return unit. It is possible to reduce the human valve opening work by allowing gas to be used.
[0010]
【Example】
Embodiments of the gas cutoff device of the present invention will be described below with reference to the accompanying drawings.
[0011]
A gas shut-off device according to an embodiment of claim 1 will be described with reference to FIGS. 1 and 2. In FIG. 1, 2 is a shut-off valve that opens and closes a gas passage, 1 is a flow rate measuring means that measures a flow rate corresponding to the passing gas flow rate, 3 is a drive unit that drives the shut-off valve 2 to open and close, 4 is a shut-off valve 2 The gas meter 6 to which the flow rate measuring unit is attached detects that the shut-off valve 2 has been operated when there is no drive signal for driving the drive unit 3 (the plunger of the shut-off valve 2 having the configuration shown in FIG. 2 has been actuated). 2 detects an open / close state of the shut-off valve 2 based on the impact signal from the impact detecting means 6 (detects the electromotive force at the time) and outputs an impact signal (of the shut-off valve 2 configured as shown in FIG. 2). An open / closed state detection unit that outputs a return request signal if it is closed (detecting inductance due to a difference in plunger position), 7 is a seismic sensor that detects earthquake vibration, and 8 is a pressure drop detection of the gas pipe Pressure sensor, 9 outside alarm An external input terminal for inputting an abnormal signal from the device, 12 is an LED as a notification means for notifying the outside that the gas passage has been blocked, and 13 is a switch as an external return means for instructing to open the shut-off valve 2 from the outside. 10 is when the gas flow rate is abnormal by the flow rate measuring means 1 or when there is an abnormal signal from the seismic sensor 7, pressure sensor 8 or external input terminal 9, the drive unit 3 is operated and the shut-off valve 2 is closed. A control unit for driving the driving unit 3 to open the shut-off sentence 2 by a signal from an external return unit (switch) while blocking the gas passage and displaying the LED (notification unit 12). In response to a return request signal from, the drive unit 3 is operated to open the shut-off valve 2 to open the gas passage, and then the flow rate measuring means 1 for a predetermined period to check whether there is any gas leakage, the seismic sensor 7 and the pressure sensor , Monitoring whether there is a return abnormality signal from the external input terminal 9, and if there is an abnormality, shuts off the shut-off valve 2 and shuts off the gas passage. If there is no abnormality, an opening operation completion signal is sent to the control unit 10 after a predetermined period. It is an automatic return part to send.
[0012]
When the shutoff valve 2 is operated due to the impact of a ball or the like and the gas passage is shut off, the impact detection unit 6 detects the electromotive force of the shutoff valve 2 and outputs an impact signal. Opening and closing state detection unit 5 outputs the return request signal if closed by measuring the y emission inductance shutoff valve 2 whether shutoff valve 2 is closed by the impact signal. The automatic return unit 11 operates the drive unit 3 in response to the return request signal to open the shut-off valve 2 to open the gas passage. After that, there is no leak of gas by the flow rate measuring means 1 for a predetermined period. It is monitored whether there is a return abnormality signal from the pressure sensor 8 and the external input terminal 9, and if there is an abnormality, the shut-off valve 2 is closed to shut off the gas passage, and if there is no abnormality, the control unit 10 is opened after a predetermined period. Send a completion signal to enable the gas. As a result, even if the gas passage is blocked by an impact or the like, safety can be ensured and the household can use the gas. The automatic return unit 11 described above can be realized by using a calculation or determination function based on a program operation of a microcomputer or the like.
[0013]
FIG. 3 shows a program flow from when the automatic return unit 11 described above receives a return request signal due to an impact until the opening operation is completed. If it is checked in process 40 that there is no return request signal from the open / close state detection unit 5, the drive unit 3 is driven in process 41 to open the shut-off valve 2 and open the gas passage. Next, in step 42, a two-minute timer is started to monitor the leakage amount. Next, in process 43, the flow rate measuring means 1 monitors whether there is a gas leak or whether there is a return abnormality signal from the seismic sensor 7, pressure sensor 8, or external input terminal 9. If there is no abnormality, whether or not the process ends for 2 minutes is confirmed in process 45, and if the process ends for 2 minutes, an open operation completion signal is sent to the control unit 10 in process 46 so that the gas can be used.
[0014]
A gas shut-off device according to an embodiment of claim 2 will be described with reference to FIG. In FIG. 4, 2 is a shut-off valve for opening and closing the gas passage, 1 is a flow rate measuring means for measuring a flow rate corresponding to the passing gas flow rate, 3 is a drive unit for driving the shut-off valve 2 to open and close, 4 is a shut-off valve 2 A gas meter equipped with a flow rate measuring means, 7 is a seismic sensor for detecting earthquake vibration, 8 is a pressure sensor for detecting a pressure drop in the gas pipe, and 9 is an abnormal signal from an external device such as an alarm. An external input terminal for input, 12 as an LED for notifying the outside that the gas passage has been shut off, 13 as a switch as an external return means for instructing to open the shut-off valve 2 from the outside, and 20 as a flow rate measuring means When the gas flow rate is abnormal due to 1 or when there is an abnormal signal from the seismic sensor 7, pressure sensor 8 or external input terminal 9, the drive unit 9 is operated to close the shut-off valve 2 and shut off the gas passage. LED (notification Step 12) is displayed and when the seismic sensor is shut off, a return request signal is output a plurality of times every predetermined period, while a drive unit 3 is driven by a signal from an external return means (switch) to turn off the shutoff valve 2 The control unit 11 that opens is operated by the return request signal from the control unit 20 to operate the drive unit 3 to open the shut-off valve 2 to open the gas passage. , Monitoring whether there is a return abnormality signal from the seismic sensor 7, pressure sensor 8, external input terminal 9, if there is an abnormality, shut off the shut-off valve 2 to shut off the gas passage, if there is no abnormality, a predetermined period of time has passed It is an automatic return unit that sends an opening operation completion signal to the rear control unit 10.
[0015]
When a drive signal is sent from the control unit 20 to the drive unit 3 due to an earthquake, the shutoff valve 2 is closed and the gas passage is shut off, the control unit 20 outputs a return request signal. The automatic return unit 11 operates the drive unit 3 in response to the return request signal to open the shut-off valve 2 to open the gas passage. After that, there is no leak of gas by the flow rate measuring means 1 for a predetermined period. It is monitored whether there is a return abnormality signal from the pressure sensor 8 and the external input terminal 9, and if there is an abnormality, the shut-off valve 2 is closed to shut off the gas passage, and if there is no abnormality, the control unit 10 is opened after a predetermined period. Send a completion signal to enable the gas. In addition, the control unit 20 outputs a return request signal three times every 24 hours because repairs such as breakage of gas pipes and the like due to an earthquake may be performed. As a result, even if the shutoff valves 2 of the households in the area are closed at the same time due to an earthquake or the like, a person in the household can use the gas after ensuring safety. There is no need to explain how to return the shut-off valve 2 to each household as before, and it is also necessary to push the switch (external return means 13) after the gas company is dispatched and confirms safety. Disappear. The automatic return unit 11 and the control unit 20 described above can be realized by using a calculation or determination function based on a program operation such as a microcomputer.
[0016]
FIG. 5 shows a program flow from when the control unit 20 and the automatic return unit 11 described above receive a return request signal due to seismic interruption to the completion of the opening operation. In step 50, the control unit 20 determines whether or not the abnormal signal from the seismic sensor 7 is interrupted, and if it is a seismic interrupt, the control unit 20 clears (0) a counter for outputting a return signal multiple times. . Next, in a process 52, the operation of the 25-hour timer is started. Next, in step 53, a return request signal is output to the automatic return unit 11. If there is a return request signal from the control unit 20, the automatic return unit 11 drives the drive unit 3 in processing 54 to open the shut-off valve 2 and open the gas passage.
[0017]
Next, in a process 55, a 2-minute timer is started to monitor the leakage amount. Next, in process 56, it is monitored whether there is any gas leakage by the flow rate measuring means 1, and whether there is a return abnormality signal from the seismic sensor 7, pressure sensor 8, or external input terminal 9. If there is no abnormality, it is confirmed in step 58 whether or not the process ends for 2 minutes. If the process ends for 2 minutes, an open operation completion signal is sent to the control unit 10 in step 59 so that the gas can be used. Next, in step 60, it is checked whether or not this operation is the third time. If it is not the third time, the counter is incremented by 1 in step 61 and 25 hours elapses in step 62, and the same processing is repeated three times from step 52. If the unsafety caused by the earthquake can be canceled within these three times, the shut-off valve 2 is automatically returned and the gas can be used.
[0018]
In embodiments obvious to the present invention from the description of the following, even if the gas passage is blocked by an impact or the like to ensure the safety person of the household has a effect that it is possible to use a gas.
[0019]
Further, it is possible to human of the household from the secure even if the simultaneous cutoff valve 2 for each household of the district closed by earthquakes or the like using the gas. There is no need to explain how to return the shut-off valve 2 to each household as in the past, and it is not necessary for the gas company to go out and check the safety to go to the switch.
[0020]
In other words, according to the embodiment of the present invention, it is possible to automatically open the valve while keeping safety at the time of shutting down, thereby reducing human valve opening work.
[0021]
【The invention's effect】
As described above, according to the present invention, even when the gas passage is blocked by an impact or the like, there is an effect that safety can be ensured and a person in the household can use the gas.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing a gas shut-off device according to one embodiment of the present invention. FIG. 2 is a block diagram showing that the shut-off valve of the device is in an open state. FIG. 3 is a block diagram showing an operation program of the apparatus. FIG. 4 is a functional block diagram showing a gas shut-off apparatus according to another embodiment of the invention. FIG. 5 is a flowchart showing an operation program of the apparatus. ] Functional block diagram showing a conventional gas shut-off device [Explanation of symbols]
2 Shut-off valve 5 Open / close state detection unit 6 Impact detection unit 7 Seismic sensor 10, 20 Control unit 11 Automatic return unit

Claims (1)

  A flow rate measuring means for measuring a flow rate corresponding to the passing gas flow rate, a shut-off valve for opening and closing the gas passage, a drive unit for opening and closing the shut-off valve, a seismic sensor for detecting earthquake vibration, and a gas A pressure sensor for detecting a pressure drop in the pipe; an external input terminal for inputting an abnormal signal from an external device; and if the gas flow rate is abnormal due to the flow rate measuring means, or the seismic sensor, the pressure sensor, and the external When there is an abnormal signal from the input terminal, the control unit that operates the drive unit to close the shut-off valve and shuts off the gas passage, and detects that the shut-off valve is operated when there is no drive signal and detects the impact signal A shock detection means for outputting an open / closed state detection unit for detecting an open / closed state of the shut-off valve based on the shock signal from the shock detection means and outputting a return request signal if closed; and the open / closed state detection The actuator is operated in response to a return request signal from to open the shut-off valve to open a gas passage, and after a predetermined period of time, there is no gas leakage by the flow rate measuring means, the seismic sensor, the pressure sensor, It is monitored whether there is a return abnormality signal from the external input terminal. If there is an abnormality, the shut-off valve is closed and the gas passage is shut off. If there is no abnormality, an opening operation completion signal is sent to the control unit after a predetermined period. Gas shut-off device with an automatic return part.

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