JPH0650535A - Gas shielding system - Google Patents

Abstract

PURPOSE:To reduce erroneous operation in which a vibration sensitive unit is operated in response to vibration similar to an earthquake even under no earthquake condition and a gas equipment plug is closed. CONSTITUTION:A control part 102 within a gas shielding unit 10 judges an occurrence of earthquake showing a vibration degree more than a predetermined value in response to an output from a self-vibration sensitive unit 101, transmits a signal concerning the judgement to another gas shielding unit 20 through a communication line 30 and concurrently receives a signal about occurrence or non-occurrence of earthquake got from another gas shielding unit 20 through the communication line 30 and in turn it performs a total judgement of the occurrence or non-occurrence of earthquake in response to both judgement signals. Then, the control unit 102 outputs a control signal for use in shielding gas to a gas shielding unit 103 when it judges totally that the vibration is caused by earthquake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off system using a plurality of gas shut-off devices that act to shut off gas when an earthquake of a predetermined seismic intensity or higher occurs, and more specifically, to a malfunction caused by vibration other than an earthquake. It relates to a reduced gas shutoff system.

[0002]

2. Description of the Related Art As a gas shutoff device of this type, a seismic sensor for detecting an earthquake, and a control section responsive to the output of the seismic sensor,
There is a control device that includes an opening / closing control of a cock of a gas appliance in response to an output of a control unit, that is, a gas cutoff unit that opens / closes a gas passage.

[0003]

In such a gas shutoff device, in order to determine the presence or absence of an earthquake at the location where the seismic sensor is installed, for example, a vibration similar to this is detected even if it is not an earthquake. There is a malfunction that the seismic device operates and the gas appliance cock is tightened.

Therefore, according to the present invention, a plurality of gas shutoff devices are connected to each other by a communication line, and the presence / absence of an earthquake is determined by the self gas shutoff device, and another gas shutoff device provided through the communication line is used. The purpose is to make it possible to comprehensively determine the presence / absence of an earthquake with the presence / absence determination of the earthquake and reduce the malfunction.

[0005]

In order to achieve such an object, in the gas shutoff system of the present invention, a plurality of gas shutoff devices are mutually connected by communication lines, and each gas shutoff device is Each has at least a seismic sensor and a control unit, and each seismic sensor senses and outputs vibration such as an earthquake, and each control unit outputs a seismic intensity of a predetermined level or more from the seismic sensor output. Determines the presence / absence of an earthquake, transmits a signal related to the determination to another gas cutoff device via a communication line, and receives a signal related to the determination regarding the presence / absence of an earthquake from another gas cutoff device via the communication line On the other hand, it is characterized in that it comprehensively judges the presence or absence of an earthquake based on both judgment signals, and outputs a control signal for gas cutoff when comprehensively judging that there is an earthquake. .

[0006]

[Operation] The control unit in the gas shutoff device makes a decision of an earthquake having a seismic intensity higher than a predetermined level from the output of the seismic sensor of its own, and sends a signal relating to the decision to another gas shutoff device via the communication line. At the same time, while receiving a signal regarding the presence or absence of an earthquake from another gas shutoff device via the communication line, comprehensive determination of the presence or absence of an earthquake is performed based on both determination signals.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a gas shutoff system according to an embodiment of the present invention. In FIG. 1, 10 and 20 are gas shutoff devices, respectively. Each gas shutoff device 10, 20
Are connected to each other by a communication line 30.
Each of the gas cutoff devices 10 and 20 has seismic sensors 101 and 201 of the same structure, control units 102 and 202, and gas cutoff units 103 and 203, respectively.

Since both gas shutoff devices 10 and 20 have the same internal configuration, the internal configuration of one gas shutoff device 10 will be described, and the description of the internal configuration of the other gas shutoff device 20 will be omitted.

The seismic sensor 101 includes a switch that vibrates in response to an earthquake and turns on and off, and a circuit that generates and outputs an electric pulse having a length corresponding to on and off of the switch. The control unit 102 individually determines a seismic intensity of a predetermined magnitude or more when a pulse of a predetermined length is output from the seismoscope 101, for example, several times, and a signal related to the determination, which is used by the communication line 30. And a control unit 20 of the other gas shutoff device 20 via the communication line 30.
A receiving unit that receives a signal related to the determination of the presence or absence of an earthquake from 2 and a comprehensive determination unit that determines the presence or absence of an earthquake based on both determination signals and a gas cutoff signal corresponding to the comprehensive determination result. Have The gas shutoff unit 103 operates in response to the comprehensive determination signal from the overall determination unit of the control unit 102 to open / close the gas cock.

The operation of the gas shutoff device 10 will be described with reference to the flow chart of FIG.

At step n1, the control unit 10 starts.
2 receives the output of the seismic sensor 101. In step n2, the control unit 102 individually determines whether or not there is an earthquake from the output of the seismoscope 101 in the individual determination unit, and the process proceeds to step n3. When it is determined that there is an earthquake in step n3, the process proceeds to step n4. In step n4,
The individual determination result is sent to the communication line 3 by the transmitting unit.
0 to the other gas shutoff device 20.

On the other hand, in step n5, the receiving unit receives the individual determination result from the other gas shutoff device 20,
In step n6, the comprehensive determination unit makes a comprehensive determination of the presence or absence of an earthquake from both determination results. If there is an earthquake in step n7, the gas path is shut off in step n8.

In this comprehensive judgment, the gas shutoff device 10 judges that there is no earthquake when at least one judgment result is no earthquake, and comprehensively judges that there is an earthquake when both judgment results indicate that there is an earthquake. According to this comprehensive judgment,
For example, even if the gas shutoff device 10 erroneously determines that an earthquake has occurred due to vibration caused by another cause that is not an earthquake, the other gas shutoff device 20 determines that there is no earthquake, and thus makes an erroneous determination that there is no earthquake but an earthquake. Can be prevented.

[0015]

As described above, according to the present invention, a plurality of gas shutoff devices are connected to each other via a communication line, and the presence / absence of an earthquake is determined by the self gas shutoff device, and other information is given via the communication line. Since the presence / absence of an earthquake from the gas shutoff device is used to make a comprehensive assessment of the presence / absence of an earthquake, malfunctions can be reduced compared to the case of determining the presence / absence of an earthquake with a single gas shutoff device.

[Brief description of drawings]

FIG. 1 is a diagram showing a gas shutoff system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a case where the gas cutoff system of the present embodiment is applied to an apartment house.

FIG. 3 is a flowchart for explaining the operation of the embodiment.

[Explanation of symbols]

 10, 20 Gas shutoff device 101, 201 Seismic sensor 102, 202 Control unit 103, 203 Gas shutoff unit 30 Communication line

Claims (1)

[Claims] 1. A plurality of gas shutoff devices (10, 20) are connected to each other by a communication line (30), and each gas shutoff device (10, 20) is a seismic sensor (101, 201). And a control unit (102, 202), each seismoscope (101, 201) senses and outputs vibration such as an earthquake, and each control unit (102, 202) Tremor (101, 20
1) The presence / absence of an earthquake having a seismic intensity equal to or higher than a predetermined value is determined from the output, and a signal related to the determination is transmitted to another gas shutoff device via the communication line (30), and the communication line (30) is also transmitted.
A gas shutoff system for receiving a signal relating to the presence or absence of an earthquake from another gas shutoff device via the device and performing a comprehensive determination of the presence or absence of an earthquake based on both of the decision signals.