JP3240938B2 - Seismic gas shutoff system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply system for supplying gas to a plurality of homes, wherein the gas supply is shut off when an earthquake is detected by a seismic sensor and a gas shutoff device. It is.

[0002]

2. Description of the Related Art Conventionally, as this kind of seismic sensing gas shut-off system, there has been known one as disclosed in Japanese Patent Application Laid-Open No. Hei 6-50535. Hereinafter, the method will be described with reference to FIG.

[0003] As shown in FIG. 18, the apparatus comprises seismic devices 1 and 2, control units 3 and 4, gas shutoff units 5 and 6, and a communication line 7.

Here, the seismic sensor 1 is a switch that vibrates in response to an earthquake to turn on and off, and measures the time of generation of the on / off electric pulse to determine whether or not the earthquake occurs. Then, when it is determined that the event is an earthquake, the signal is transmitted to the control unit 4 of another gas cutoff unit 6 via the communication line 7. Then, in order to prevent erroneous shutoff, when the seismic judgment of both the seismic sensors 1 and 2 determined that there was an earthquake, the gas was cut off by the gas shutoff units 5 and 6 as an earthquake.

[0005]

However, according to the above-mentioned prior art, when an earthquake occurs, if there is a large number of seismometers and there is at least one seismic sensor that does not detect the earthquake, gas cannot be shut off. There is a problem of insufficient safety,
Moreover, the greater the number of seismic devices, the greater this insecurity.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a gas supply base for supplying gas to each house, a gas meter provided for each house, and a gas supply base provided by the gas supply base. A gas flow path to be sent to the gas meter, a first gas shut-off means provided at the gas supply base, a first vibration sensing means provided at the gas supply base,
A second gas shut-off unit that individually shuts off gas supply to each of the doors, a second seismic unit provided in the gas meter, and any one of the first and second seismic units. A control means is provided for closing at least one of the first gas shut-off means or the second gas shut-off means when detecting an earthquake.

[0007] According to the above invention, even if a part of the seismic means has a problem, it is possible to reliably detect the earthquake and shut off the gas, thereby realizing a highly safe system.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a gas supply base for supplying gas to each house, a gas meter provided in each house,
A gas flow path for sending the gas supplied by the gas supply terminal to the gas meter, a first gas shutoff means provided at the gas supply base, and a first vibration sensing means provided at the gas supply base. A second gas shutoff means for individually shutting off gas supply to each of the doors, and a second gas shutoff means provided in the gas meter.
When at least one of the first and second seismic sensing means detects an earthquake, at least one of the first gas shutting means or the second gas shutting means is operated. It is provided with control means for closing. Even if a part of the seismic sensing means should fail, the other normal seismic sensing means can reliably detect the earthquake and shut off the gas.

[0009] Further, a control means is provided for closing the second gas shut-off means when one of the first and second seismic means detects an earthquake. Then, the gas can be shut off at the most downstream side, and quick return is possible because the return operation is a small block.

[0010] The present invention further comprises a control means for closing the first gas shut-off means when one of the first and second seismic means detects an earthquake. And, since the gas can be shut off at the most upstream side by the earthquake detection, the gas can be completely shut off and a very safe gas shutoff shutoff system can be provided.

[0011] Further, a control means for closing the first gas shut-off means when the first seismic means of the first seismic means and the second seismic means detects an earthquake. did. Then, the quake caused by the earthquake at the gas supply base is detected and the gas is shut off at the base, and the second seismic sensing means is directed to closing the second gas cut-off means on the downstream side. And the convenience on the downstream side can be achieved at the same time.

[0012] Further, the apparatus is provided with a control means for closing the first gas shut-off means when the second seismic sensing means detects an earthquake. Even if the shaking caused by the earthquake differs between the base and the downstream, information is obtained in a spatially wide area on the downstream side where the gas is actually used, so that signs of the earthquake can be quickly detected. Since the gas at the gas supply base is shut off, the entire gas supply range can be safely managed.

[0013] Further, a control means for closing the first gas shut-off means when the plurality of second seismic means detects an earthquake is provided. Further, since there is a plurality of downstream seismic sensing means for sensing the earthquake and the gas is shut off, more reliable gas shut-off can be performed while preventing malfunction.

Further, the apparatus is provided with control means for closing all the second gas shutoff means when the second seismic means detects an earthquake. Even if an earthquake is partially detected on the downstream side, gas is shut off on the most downstream side, and safety on the user side can be ensured.

[0015] Further, when a plurality of second seismic sensing means detects an earthquake, a control means for closing all the second gas shut-off means is provided. In addition, even when a partial earthquake is detected on the downstream side, the determination is made by a plurality of seismic sensing means, so that malfunction can be prevented and safety on the user side can be ensured.

Each of the seismic sensing means, each of the gas shut-off means and the control means is provided with a means for communicating by wireless means. By exchanging signals by wireless communication, it is possible to easily cope with the necessity of network wiring work even when exchanging signals between a plurality of devices, and to easily respond to changes in the number of gas meters and the like.

Further, the gas supply base is provided with a seismic sensing means for notifying the seismic information of each seismic means. And where the earthquake was detected can be easily managed at the base.

Further, the level of the seismic sensitivity of the first seismic
It is set lower than the seismic level of the seismic means.
And since the seismic level of the seismic means at the base is lower,
The base side can be set to detect before the seismic sensing means of the gas meter in each house, and safety is enhanced by first shutting off the gas supply at the base, setting the seismic level on the downstream side to be high. Since it is possible, malfunction can be prevented.

Further, when two or more of the first and second seismic sensing means detect an earthquake of a first seismic level or higher, the first seismic means and Closing at least one of the first gas shutoff means or the second gas shutoff means when at least one of the second seismic means detects an earthquake above the second seismic level; First
Is set lower than the second seismic level. Since the individual seismic level can be set high, malfunction can be prevented.

Further, the plurality of second seismic units are configured to operate the seismic operation at different times.
Then, the earthquake can be monitored by a plurality of seismic sensing means, and the seismic sensing operation is performed intermittently in each gas meter, thereby saving power.

Further, one of the second seismic means is the other second seismic means.
And a calling means for transmitting information so as to sequentially activate the seismic sensing operations of the seismic sensing means. Then, the earthquake monitoring is performed reliably and continuously, safety can be ensured, and each of the seismic sensing means performs a seismic sensing operation at a long time interval, thereby further saving power.

Further, there is provided a vibration sensing registration means for adding and deleting a second vibration sensing means which is sequentially activated by the calling means. And it can respond easily and reliably to the increase and decrease of the number of dwelling units using the gas meter.

The seismic sensing means includes a vibration acceleration sensor capable of detecting a signal corresponding to the vibration acceleration.
Then, by detecting the vibration acceleration signal, it is possible to accurately determine whether or not an earthquake has occurred.

After the first gas shut-off means is closed,
It is provided with control means for closing the second gas cutoff means. In addition, gas can be shut off in a very short time when an emergency is required, such as a large earthquake.

After the second gas shut-off means is closed,
It is provided with control means for closing the first gas shutoff means. Then, since the base is shut off after the downstream side is securely closed, the confirmation work at the time of return is easy, and the return work can be performed quickly.

Further, when each of the gas shut-off means is restored, a control means for opening the first gas shut-off means after the second gas shut-off means opens. And return work can be performed safely.

Also, among the two or more second seismic means,
Control means for closing the first gas shut-off means when the second seismic means detects an earthquake except for the second seismic means having the closest linear distance to the second seismic means detecting the first earthquake; It is provided with. Then, by using a plurality of non-adjacent pieces, the discrimination accuracy can be further increased and the entire gas supply range can be safely managed.

Further, among the two or more second seismic means,
Control to close all the second gas shut-off means when the second seismic means detects an earthquake except for the second seismic means having the closest linear distance to the second seismic means that has detected the earthquake Means. Then, by using a plurality of non-adjacent pieces, the discrimination accuracy can be further enhanced, and gas can be shut off at the most downstream side to ensure safety on the user side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a configuration diagram of a seismic gas shutoff system according to Embodiment 1 of the present invention. In FIG. 1, 8 is a gas supply base, 9 is a gas pipeline as a gas flow path for supplying gas to each house, 10 to 14 are gas meters provided in each house, 15
Is a first gas shut-off means provided at the gas supply base 8, 16 is a first seismic means provided at the gas supply base 8, and 17 is a second gas provided at each of the gas meters 10 to 14. The shut-off means 18 is connected to each of the gas meters 10 to 1
The second seismic means 19 provided in 4 is one of the first and second gas shutoff means 15 and 17 when any of the first to third seismic means detects an earthquake. Are each second control means as control means for closing the control. 20 is a first control means, 21 is a gas tank, 22 is a gas valve, 23
Is a pressure regulator, 24 is a gas appliance, and 25 is a gas supply range.

As shown in FIG. 2, a vibration acceleration sensor 26 as the second seismic means 18, an amplifier 27,
The bandpass filter 28. Then, an earthquake discriminating means 29 for discriminating whether or not there is an earthquake from a signal of the vibration acceleration sensor 26 as the second control means 19, a discriminating signal transmitting means 30 for transmitting a signal at the time of earthquake discrimination, A discrimination signal receiving means 31 for receiving an incoming signal; and a discrimination signal counter means 32 for counting the discrimination signals.

Next, the operation and operation will be described with reference to FIGS. When the signal level of the vibration acceleration sensor 26 installed in the gas meter 10 is equal to or higher than a predetermined value (for example, 200 cm / s ² ), the vibration signal is detected, and the vibration is detected by the earthquake determination means 29. Determine if an earthquake. When it is determined that an earthquake has occurred, an earthquake determination signal is output, and an earthquake determination signal is output to the second control means 19 of the other gas meters 11 and 12 by a wireless signal. Then, the earthquake determination means 29 of the gas meter 10 confirms ON / OFF of the time timer,
If not, turn on the timer. Further, it is determined whether the time is within a predetermined time (for example, within 10 seconds, optimally within 1 second) from the time when the timer is turned on, and if it is within the predetermined time, the number C of the determination signals is counted by the earthquake determination signal counter means 32. is there. And when the seismic sensing means performs the shut-off operation when detecting an earthquake,
When the number becomes 2 or more (when one of the seismic sensing means performs an interruption operation when detecting an earthquake, when the number becomes 1), it is determined that an earthquake has occurred, and the second of the gas meter 10 is determined. The gas shut-off means 17 is closed.

Here, the second of the other gas meters 11 and 12
Similarly, the control means 19 transmits an earthquake discrimination signal when an earthquake is detected, so that the discrimination signal receiving means 31 of the gas meter 10 receives the signal and performs processing by the interrupt processing shown in FIG. As a result, the discrimination signal counter 32 of the second controller 19 of the gas meter 10 has a count of 2 or more. In addition, other gas meters 11 and 12
If the second control means 19 does not detect an earthquake, the count number of the discrimination signal counting means 32 remains at 1 and a predetermined time has elapsed, so the count number is reset (C = 1) and the count number is Since it will not be more than 2,
Even if one seismic sensing means malfunctions for some reason and sends out an earthquake discrimination signal, it is possible to prevent malfunctioning without erroneously shutting off the gas.

Also, since a header signal indicating which group the signal belongs to is added to the earthquake discrimination signal,
Only the corresponding control means operates. As a result, it is possible to close the gas shutoff means 17 of the group in which the vibration is detected, for example, all the second gas meters 10, 11, 12, 13, 14. Furthermore, the gas cutoff is activated by the detection signals of a plurality of non-adjacent seismic sensing means, and two or more adjacent seismic sensing means malfunction due to local vibration or impact and transmit an earthquake discrimination signal. However, the gas shut-off means is not accidentally closed. Therefore, it is possible to further increase the accuracy of earthquake determination and shut off gas at the most downstream side, and further prevent unnecessary gas shutoff, thereby improving convenience on the user side.

Further, by exchanging signals by radio signals, network exchange work is not required even when exchanging signals between a plurality of signals, and it is possible to easily cope with an increase or decrease in the number of gas meters or the like.

As shown in FIG. 5, the vibration detection level at which the plurality of second seismic means 18 determines that an earthquake has occurred is set lower than the level at which the earthquake is determined alone. That is, 2
In the case of 00 cm / s ² , an earthquake judgment was performed by itself and 15
In the case of 0 cm / s ² , an earthquake is not determined unless there are a plurality of earthquake identification signals. As a result, even a small earthquake can be detected, and detection can be performed earlier, and safety can be improved. By using the vibration sensing means capable of detecting the vibration acceleration level, it is possible to set such a fine vibration acceleration level, and it is possible to improve the safety of gas shutoff by improving the accuracy of earthquake determination. As vibration acceleration sensors, piezoelectric type, capacitive type,
A strain resistance type or the like is conceivable.

As described above, by shutting off the gas when any of the seismic sensing means senses an earthquake, even if a part of the seismic sensing means should fail, the other normal seismic sensing means can be surely used. Gas can be shut off by detecting an earthquake, and earthquake detection can be performed in a wider range, and disasters can be prevented more quickly and safely. By detecting that a plurality of second seismic sensing means have detected an earthquake, the accuracy of seismic isolation can be improved, and gas is shut off at the most downstream side to ensure safety on the user side. The restoration work can be realized with little inspection when restoration is possible.

Although the case in which the second seismic sensing means detects an earthquake has been described, it is also possible to close the second gas shut-off means when the first seismic sensing means detects an earthquake. . Regarding the detection of the second seismic sensing means, even if all the second gas shutting means are closed by one seismic isolation, the gas shutting means can be closed, and the same effect can be obtained. it can.

(Embodiment 2) FIGS. 6 and 7 are block diagrams showing a seismic gas shutoff system according to Embodiment 2 of the present invention. The difference from the first embodiment is that, when the discrimination signal detection means 33 as the first control means 20 receives the earthquake discrimination signals from the first vibration sensing means 16 and the second vibration sensing means 18, the first Control means 2
The function of closing the first gas shut-off means 15 at 0 is provided.

Next, the operation and operation will be described with reference to FIGS. 8, 9 and 3. FIG. When the signal level of the vibration acceleration sensor 26 installed in the gas supply base 8 as the first vibration sensing means 16 is equal to or higher than a predetermined value (for example, 100 cm / s ² ), the vibration signal Is detected, and whether or not the vibration is an earthquake is determined by the earthquake determination means. Then, when it is determined that an earthquake has occurred, an earthquake determination signal is output to close the first gas shut-off means 15.

When the vibration acceleration sensor 26 of the second seismic sensing means 18 similarly detects vibration (for example, 200 cm / s ² or more) and determines that an earthquake has occurred, the first control means 2
An earthquake discrimination signal is output by a radio signal toward zero. Then, it is determined that an earthquake has occurred, and the first gas shutoff means 15 is determined.
Is to close.

As described above, when an earthquake is detected in either the first seismic means 16 or the second seismic means 18, the gas is shut off using the first gas shut-off means 15. The disaster can be prevented beforehand and safely by closing the first gas shut-off means 15 serving as the gas supply base 8.

In order to close the first gas shut-off means 15 only when the first seismic sensing means 16 detects an earthquake,
This can be realized by turning off the interrupt processing of the first control means 20 shown in FIG. As a result, the first gas sensing means 20 and the first control means can close the first gas shut-off means 19 without performing unnecessary processing. Power consumption. Further, by closing the first gas shut-off means 15 by the first vibration sensing means 16, the first vibration sensing means 16 is closed.
The safety of the gas supply base 8 can be ensured by further improving the detection accuracy of the gas (for example, burying underground), and the second seismic sensing means 18 can be used by turning the second gas shutoff means 17 to close. By setting the seismic level high, malfunctions can be prevented, unnecessary gas shutoff is reduced, and downstream convenience is ensured.

In order to close the first gas shut-off means 15 only by the seismic sensing of the plurality of second seismic sensing means 18, as shown in FIGS.
By using the time timer processing and the discrimination signal counter means 32 in the processing of 0, the processing can be performed in the same manner as in the first embodiment. As a result, by setting the number of discrimination signals to C ≧ 2, the first gas shut-off means 19 is not closed only by the earthquake detection signal of one seismic sensing means, so that troubles such as malfunctions can be eliminated. Furthermore, by operating the gas shut-off by the detection signals of a plurality of non-adjacent seismic sensing means, two or more adjacent seismic sensing means malfunction due to local vibration or impact and transmit an earthquake discrimination signal. Even if the gas shut-off means is not accidentally closed, the accuracy of earthquake determination can be increased and the gas shut off can be further improved, preventing the disruption of convenience due to unnecessary gas shut-off and shutting off gas at the gas station to supply gas. The entire range can be managed safely.

Further, although the second gas shutoff means 17 needs a plurality of earthquake discrimination signals, the control is performed so that the first gas cutoff means 15 is immediately closed by the earthquake discrimination signal of the first seismic sensing means 16. Can be sufficiently understood in the present embodiment.

As described above, by providing the control means for closing the first gas shut-off means when one of the first and second seismic means detects an earthquake, even the slightest danger information can be obtained. By shutting off the gas shut-off means 1 and shutting off the gas supply source, the effect of improving safety can be obtained. Also, only when the plurality of second seismic sensing means detects an earthquake,
Providing the control means for closing the first gas cutoff means has an effect that the malfunction can be reduced by making a judgment based on a lot of information without relying only on a single piece of seismic sensor information.
Further, in a configuration in which the second seismic sensing means includes a control means for closing the first gas shut-off means when an earthquake is detected, even in a spatially wide area like the second seismic sensing means. By arranging the means and obtaining a large amount of information, it is possible to obtain an effect that a safety system in which the gas supply base is shut off quickly can be taken in response to a slight earthquake sign.

The seismic level (for example, 100 cm / s ² or more) of the first seismic means is set lower than the seismic level (for example, 200 cm / s ² or more) of the second seismic means. is there. As a result, the seismic level of the base seismic means is lower, so when other seismic means detect, it can be set to detect first, and by shutting off the original gas supply first In addition to improving safety, the seismic level on the downstream side can be set high, which prevents malfunctions.

(Embodiment 3) FIG. 13 is a block diagram showing a seismic gas shutoff system according to Embodiment 3 of the present invention. The difference from the first embodiment is that the second control means 19 includes a calling means 34.
, A seismic sensor registration means 35, a calling signal transmitting means 36, a calling signal receiving means 37, and a battery 38 as a power source.

Next, the operation and operation will be described with reference to FIG. Calling means 34 provided in the second control means 19
Waits for a call from another second control means 19 by a call signal. Then, when the calling signal is received, the second vibration sensing means is activated by the calling means 34. Then, after receiving the calling signal, a calling signal for calling the next second seismic means 19 is transmitted. Since the address of the seismic means registered in the seismic registration means 35 is transmitted to the call signal, only the pertinent seismic means is called.

As described above, by sequentially activating the second vibration sensing means, the operation time of the second vibration sensing means can be reduced. That is, as shown in FIG. 1, if there are five second seismic means in one gas supply range 25,
It is only necessary to monitor the occurrence of the earthquake on one of the units, so it is not necessary for all five units to constantly monitor. Therefore, the monitoring time can be reduced to 1/5. As a result, the life of the battery can be significantly prolonged in the second vibration sensing means 18 using the battery as a power source. Further, since the seismic sensor registration means 35 for adding or deleting the second seismic sensor 18 is provided, it is possible to change even if the second seismic sensor increases or decreases. By inputting the address of the second seismic means to be called, it is possible to set the order in which calls are made.

As shown in FIG. 15, the gas supply base 8 has a seismic sensing means 3 for notifying the seismic information of each seismic sensing means.
A configuration including an earthquake detection lamp 40 and a notification speaker 41 as No. 9 was adopted. As a result, at the gas supply base 8, it is possible to see at a glance which seismic sensing means has detected the earthquake, and the recovery operation can be performed easily and safely.

(Embodiment 4) FIG. 16 is a flowchart showing a seismic sensing gas cutoff system according to Embodiment 4 of the present invention. The difference from the first embodiment is that a "first gas shutoff signal output" is provided before the "second gas shutoff means is closed".

Next, the operation and operation will be described. In addition,
The operation of the earthquake detection by the second seismic sensing means 18 and the second control means is the same as that of the first embodiment, so that the explanation is omitted, and the procedure for closing the gas shutoff means will be described here. As described in the first embodiment, when an earthquake is detected on the gas meter side, in the present embodiment, a signal is first sent to the first control means 20 with “first gas cutoff signal output”, and the first control means 20 As shown in FIG. 9, the first gas shutoff means is closed, and then the second gas shutoff means 17 is closed.

For this reason, the gas supply base 8 at the source can be closed in a very short time, and even if the gas pipeline 9 is damaged due to a huge earthquake or the like, the amount of gas leakage can be minimized, and safety can be improved. Can be more enhanced.

In the case where the seismic detection value of the seismic means for detecting the earthquake is very large and the possibility of collapse of the house is high (for example, 250 cm / s ² due to strong earthquake or severe earthquake vibration).
In the above, the closing procedure can be realized by additionally providing a priority setting unit (not shown) for closing the first gas shutoff means 15 with priority. Similar effects can be obtained when the first seismic unit 16 detects an earthquake.

(Embodiment 5) FIG. 17 is a flowchart showing a seismic sensing gas cutoff system according to Embodiment 5 of the present invention. The difference from the first embodiment is that a “first gas cutoff signal output” is provided after the “second gas cutoff means is closed”.

Next, the operation and operation will be described. In addition,
The operation of the earthquake detection by the second seismic sensing means 18 and the second control means is the same as that of the first embodiment, so that the explanation is omitted, and the procedure for closing the gas shutoff means will be described here. In this embodiment, first, the second
Is closed, and then a signal is sent to the first control means 20 with "first gas cut-off signal output". With this signal, the first control means 20 closes the first gas shutoff means as shown in FIG. In this way,
It communicates with each of the second control means 19 to confirm that each of the second gas cutoff means 17 is closed, and after closing all of the second gas cutoff means 17, returns to the original first gas cutoff means 15. Is to close.

Therefore, the closing control in each gas meter can be executed without fail. Further, the usage state of the gas appliance 24 in each gas meter is checked, and if the gas appliance 24 is in operation, the gas appliance 24 is stopped and then the second gas shut-off means 17 is operated.
Can be closed. Therefore, by securely closing the downstream side, the safety on the use side can be further improved, and the use state of the gas appliance 24 can be checked, so that the operation at the time of return can be performed safely and promptly.

When the seismic detection value of the seismic means that has detected an earthquake indicates that there is little danger of house collapse (for example,
In the case of less than 250 cm / s ² due to the vibration below the strong quake, this closing procedure can be realized by additionally providing a priority setting section (not shown) for closing the second gas shutoff means 17 with priority. . Similar effects can be obtained when the first seismic unit 16 detects an earthquake.

At the time of return, the second gas shut-off means 17
By providing a control means (not shown) for opening the first gas shut-off means 15 after opening the valve, the status of the gas appliance 24 at each gas meter can be grasped, so that the return operation can be performed more safely. You.

[0060]

As described above, according to the seismic gas shutoff system of the present invention, the following effects can be obtained.

A control means for closing at least one of the first and second gas shut-off means when one of the first and second seismic means detects an earthquake is provided. Even if a part of the seismic means fails, the other normal seismic means can reliably detect the earthquake and shut off the gas.
In addition, detection can be performed in a wider range, and disasters can be prevented faster and more safely.

[0062] Further, there is provided a control means for closing the second gas shut-off means when one of the first and second seismic means detects an earthquake. Then, the gas can be shut off at the most downstream side, and quick return is possible because the return operation is a small block.

Further, when any one of the first and second seismic sensing means detects an earthquake, a control means for closing the first gas shut-off means is provided. And, since the gas can be shut off at the most upstream side by the earthquake detection, the gas can be completely shut off and a very safe gas shutoff shutoff system can be provided.

Further, a control means for closing the first gas cutoff means when the first seismic means detects an earthquake is provided. Then, the power consumption of the first control means can be reduced, and the security at the base and the convenience on the downstream side can both be ensured.

[0065] Further, when the second seismic sensing means detects an earthquake, a control means for closing the first gas shutoff means is provided. In addition, a large amount of information can be obtained over a wide area and the signs of an earthquake can be quickly detected, and the gas can be shut off at the base of the gas supply base, and the entire gas supply range can be managed with increased safety. .

Further, a control means for closing the first gas cutoff means only when the plurality of second seismic means detects an earthquake is provided. In addition, the accuracy of the seismic isolation can be improved, and a highly reliable gas isolation that prevents malfunction can be achieved.

Further, when the second seismic sensing means detects an earthquake, control means for closing all other second gas shut-off means provided in the gas pipe for supplying gas to the second gas shut-off means. It is provided with. Then, even when an earthquake is partially detected on the downstream side, gas is shut off on the downstream side, and safety on the user side can be ensured.

Also, only when the plurality of second seismic sensing means detects an earthquake, all other second gas shutting means provided in the gas pipeline for supplying gas to the second gas shutting means are provided. The structure provided with the control means for closing is provided. In addition, even when a partial earthquake is detected on the downstream side, the determination is made by a plurality of seismic sensing means, so that malfunction can be prevented and safety on the user side can be ensured.

Each of the seismic sensing means, each of the gas shutoff means and the control means is provided with a means for communicating by wireless means. By exchanging signals by wireless communication, it is possible to easily cope with the necessity of network wiring work even when exchanging signals between a plurality of devices, and to easily respond to changes in the number of gas meters and the like.

Further, the gas supply base is provided with a seismic sensing means for notifying the seismic information of each seismic means. And where the earthquake was detected can be easily managed at the base.

The level of the seismic sensitivity of the first seismic means is the second level.
It is set lower than the seismic level of the seismic means.
And since the seismic level of the seismic means at the base is lower,
The base side can be set to detect before the seismic sensing means of the gas meter in each house, and safety is enhanced by first shutting off the gas supply at the base, setting the seismic level on the downstream side to be high. Since it is possible, malfunction can be prevented.

The seismic level when a plurality of seismic means among the first and second seismic means detect an earthquake is:
The seismic level is set lower than the seismic level when one seismic unit detects an earthquake. In addition, even a small earthquake can be detected more quickly to enhance safety, and since individual seismic levels can be set higher, malfunction can be prevented.

Further, the second seismic sensing means is configured to operate the seismic operation at different times. Then, the earthquake can be monitored by a plurality of seismic sensing means, and the seismic sensing operation is performed intermittently in each gas meter, thereby saving power.

Further, the second vibration sensing means has a communication means for transmitting information so as to sequentially activate the vibration sensing operation of the other vibration sensing means. Then, the earthquake monitoring is performed reliably and continuously, safety can be ensured, and each of the seismic sensing means performs a seismic sensing operation at a long time interval, thereby further saving power.

Further, the apparatus is provided with a vibration sensor registration means for setting addition and deletion of the second vibration sensor means. And it can respond easily and reliably to the increase and decrease of the number of dwelling units using the gas meter.

The vibration sensing means uses a vibration acceleration sensor capable of detecting a signal corresponding to the vibration acceleration.
Since the vibration acceleration level can be detected, it is possible to accurately determine whether or not an earthquake has occurred, and the safety of gas shutoff can be improved.

After the first gas shut-off means is closed,
It is provided with control means for closing the second gas cutoff means. In addition, the gas can be shut off in a very short time within a very short time, and the safety can be further improved.

After the second gas shut-off means is closed,
It is provided with control means for closing the first gas shutoff means. The safety of the user side can be ensured because the base is shut off after the downstream side is securely closed, and further, the confirmation work at the time of return can be facilitated, and the return work can be promptly performed.

Further, at the time of return, after the second gas shut-off means is opened, a control means for opening the first gas shut-off means is provided. And return work can be performed safely.

Further, there is provided control means for closing the first gas cutoff means when two or more second seismic means which are not adjacent to each other detect an earthquake. And, by using a plurality of non-adjacent pieces, the discrimination accuracy can be further improved,
In addition, malfunctions due to local impacts can be prevented,
Further, the entire gas supply range can be safely managed in the event of an earthquake.

Further, there is provided a control means for closing all the second gas shut-off means when two or more non-adjacent second seismic means detect an earthquake. The discrimination accuracy can be further improved by using a plurality of non-adjacent ones, unnecessary occurrence of gas shut-off due to malfunction can be prevented, convenience on the use side can be improved, and gas shut-off at the most downstream side. Security on the user side.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a seismic sensor gas shutoff system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a second seismic unit, a second gas shut-off unit, and a control unit of the system.

FIG. 3 is a flowchart illustrating the operation of the system.

FIG. 4 is a flowchart illustrating the operation of the system.

FIG. 5 is a flowchart illustrating the operation of the system.

FIG. 6 is a block diagram of a first vibration sensing means, a first gas blocking means, and a control means of the vibration sensing gas cutoff system according to the second embodiment of the present invention;

FIG. 7 is a block diagram of a second vibration sensing means, a second gas blocking means, and a control means of the vibration sensing gas cutoff system according to the second embodiment of the present invention;

FIG. 8 is a flowchart illustrating the operation of the system.

FIG. 9 is a flowchart illustrating the operation of the system.

FIG. 10 is a block diagram of another embodiment of the system.

FIG. 11 is a flowchart illustrating the operation of another embodiment of the system.

FIG. 12 is a flowchart illustrating the operation of another embodiment of the system.

FIG. 13 is a block diagram of a seismic gas shutoff system according to a third embodiment of the present invention.

FIG. 14 is a flowchart illustrating the operation of the system.

FIG. 15 is a configuration diagram of a seismic alerting means of the system.

FIG. 16 is a flowchart for explaining the operation of the seismic gas shutoff system according to the fourth embodiment of the present invention.

FIG. 17 is a flowchart for explaining the operation of the seismic sensor gas cutoff system according to the fifth embodiment of the present invention.

FIG. 18 is a configuration diagram of a conventional seismic device.

[Explanation of symbols]

 Reference Signs List 8 gas supply base 9 gas pipeline (gas flow path) 10, 11, 12, 13, 14 gas meter 15 first gas shutoff means 16 first seismic sensing means 17 second gas shutoff means 18 second seismic sensing Means 19 Second control means 20 First control means

Continuation of front page (56) References JP-A-9-275141 (JP, A) JP-A-58-106279 (JP, A) JP-A-57-97198 (JP, A) JP-A-7-239099 (JP, A) JP-A-6-160541 (JP, A) JP-A-57-103754 (JP, U) JP-A-57-53200 (JP, U) Utility model registration 3023274 (JP, U) Utility model registration 3039673 (JP, U) JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F17D 5/02 G01H 1/00

Claims (21)

(57) [Claims] 1. A gas supply base for supplying gas to each house, a gas meter provided in each house, a gas flow path for sending gas supplied from the gas supply base to the gas meter, and a gas flow path provided in the gas supply base. First gas cutoff means provided, first seismic means provided at the gas supply base,
A second gas shut-off unit that individually shuts off gas supply to each of the doors, a second seismic unit provided in the gas meter, and any one of the first and second seismic units. A seismically-sensitive gas shut-off system comprising a control means for closing at least one of the first gas shut-off means or the second gas shut-off means when the quake detects an earthquake. 2. The first seismic means and the second seismic means,
2. The seismically-sensitive gas shut-off system according to claim 1, further comprising control means for closing the second gas shut-off means when any one of them detects an earthquake. 3. The first seismic means and the second seismic means,
2. The seismic gas shutoff system according to claim 1, further comprising control means for closing the first gas shutoff means when any of them detects an earthquake. 4. The first and second seismic sensing means, wherein:
The seismic sensing gas shut-off system according to claim 1, further comprising control means for closing the first gas shut-off means when the first seismic sensing means detects an earthquake. 5. The method according to claim 1, wherein said second seismic means detects an earthquake.
2. The seismic gas shutoff system according to claim 1, further comprising control means for closing said gas shutoff means. 6. The seismic sensing gas shut-off system according to claim 5, further comprising control means for closing the first gas shut-off means when the plurality of second seismic sensing means detects an earthquake. 7. The system according to claim 1, further comprising control means for closing all the second gas shutoff means when the second seismic means detects an earthquake. 8. The seismic sensing gas shutoff system according to claim 7, further comprising control means for closing all the second gas shutoff means when the plurality of second seismic sensing means detects an earthquake. 9. The system according to claim 1, wherein each of the seismic sensing means, each of the gas shutoff means, and the control means communicate by wireless means. 10. The seismic sensing gas shut-off system according to claim 1, wherein said gas supply base is provided with seismic sensing means for notifying the seismic information of each seismic sensing means. 11. The seismic sensing gas shut-off system according to claim 1, wherein the seismic level of the first seismic means is set lower than the seismic level of the second seismic means. 12. When at least two of the first and second seismic sensing means detect an earthquake of a first seismic level or higher, the first seismic means and Closing at least one of the first gas shutoff means or the second gas shutoff means when at least one of the second seismic means detects an earthquake above the second seismic level; 2. The method according to claim 1, wherein the first seismic level is set lower than the second seismic level.
The described seismic gas shutoff system. 13. The seismic sensing gas shut-off system according to claim 1, wherein the plurality of second seismic sensing means operate the seismic sensing operation at different times. 14. The seismic gas shut-off according to claim 13, wherein one of the second seismic means has a calling means for transmitting information so as to sequentially activate the seismic operation of the other second seismic means. system. 15. The seismic sensing gas shut-off system according to claim 14, further comprising a seismic sensing registration means for adding or deleting a second seismic sensing means sequentially activated by the calling means. 16. The seismic sensor according to claim 1, wherein at least one of the seismic sensors has a vibration acceleration sensor capable of detecting a signal corresponding to the vibration acceleration. 17. After the first gas shut-off means is closed, the second gas shut-off means is closed.
2. The seismic gas shutoff system according to claim 1, further comprising control means for closing said gas shutoff means. 18. After the second gas shut-off means is closed, the first gas shut-off means is closed.
2. The seismic gas shutoff system according to claim 1, further comprising control means for closing said gas shutoff means. 19. The seismically-sensitive gas shut-off system according to claim 1, further comprising control means for opening the first gas shut-off means after the second gas shut-off means opens when each gas shut-off means returns. 20. The second seismic means, excluding the second seismic means having the closest linear distance to the second seismic means detecting one earthquake, of the two or more second seismic means. 7. The seismically-sensitive gas shut-off system according to claim 6, further comprising control means for closing the first gas shut-off means when detecting an earthquake. 21. Second seismic sensing means excluding the second seismic sensing means which is closest to the second seismic sensing means which has detected one earthquake out of two or more second seismic sensing means. 9. The seismically-sensitive gas shut-off system according to claim 8, further comprising control means for closing all of the second gas shut-off means when detecting an earthquake.