JPH1038269A - Gas shut-off device and power failure processing method used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas shut-off device capable of controlling the shout-off of the gas flow in a gas feed passage to a shout-off valve even in a power failure condition, and a power failure processing method. SOLUTION: A shut-off valve control means 14 is provided which controls shut-off of the gas flow in a gas feed passage 18 by giving the gas shut-off command 14a to shut-off valve 16 irrespective of presence/absence of the gas leakage alarm signal 12a when the power failure condition is continuously generated for the continuous power failure permitting time after a gas alarm 12 continuously gives the gas leakage alarm signal 12a for the first gas leakage permitting time.

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 device for preventing gas leakage and a power cut-off method used for the gas shut-off device in the event of a power cut. A gas alarm device for generating a gas leak alarm signal, a shutoff valve control means for receiving a gas leak alarm signal and generating a gas shutoff command for preventing a gas leak condition, and receiving a gas shutoff command interposed in a gas supply path. The present invention relates to a gas shut-off device having a shut-off valve for shutting off a flow of gas flowing through a gas supply path, and a power failure processing method used when such a gas shut-off device is placed in a power failure situation.

[0002]

2. Description of the Related Art Conventionally, a gas shut-off device of this type continuously generates a gas leak alarm signal while sensing a gas leak condition, and prevents a gas leak condition upon receiving a gas leak alarm signal. And a shut-off valve interposed in the gas supply path to cut off the flow of gas flowing into the gas supply path in response to the gas cut-off instruction.

[0003] The gas alarm outputs a voltage of 6 V when power is normally supplied and no gas leakage state is detected, and when the power is normally supplied. When the gas leak state was continuously detected, a voltage of 12 V was continuously output as a gas leak alarm signal.

In such a gas shut-off device and a power failure processing method used for the same, the shut-off valve control means is provided with a backup power source (specifically, a 24V power supply realized by a large-capacity capacitor or battery) at the time of a power failure. 6V DC power supply)
However, since the gas alarm was driven by a 100 V AC power supply, no backup power supply (that is, 100 V AC power supply) was provided, and the power supply was cut off. In such a case, the gas alarm continuously output a voltage of 0 V regardless of the detection of the gas leak state.

[0005]

However, in the conventional gas shut-off device and the power failure processing method used for the same,
In the event of a power outage when the power supply to a gas alarm without a backup power supply is interrupted (that is, when the power outage continues under a gas leak condition), the gas alarm condition in the gas alarm device Detection becomes impossible and the voltage of 0V is continuously output from the gas alarm regardless of the presence or absence of the gas leakage state. Therefore, the control to shut off the flow of the gas flowing through the gas supply path is performed on the shutoff valve. Therefore, there is a technical problem that a gas leakage state is continued and a dangerous state occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional technical problem. A power failure state occurs after a gas alarm issues a gas leak alarm signal continuously for a predetermined first gas leak allowable time. When a predetermined continuous power failure allowable time continues, regardless of the presence or absence of a gas leak alarm signal, a gas shutoff command is given to the shutoff valve to execute a control for shutting off a flow of gas flowing in a gas supply path. By providing the shut-off valve control means configured to perform the control to shut off the flow of the gas flowing in the gas supply path even under a power failure state, even if the backup power supply is not provided in the gas alarm device, It is an object of the present invention to provide a gas shut-off device which can be executed for a power cut-off state and thereby can prevent a gas leakage state under a power cut-off state, and a power cut-off method used for the same.

[0007]

According to a first aspect of the present invention, there is provided a gas alarm device for continuously generating a gas leak alarm signal while sensing a gas leak condition, and a gas leak alarm signal for generating a gas leak alarm signal. Shutoff valve control means 14 for generating a gas shutoff command 14a for preventing a gas leakage state upon receiving the gas shutoff valve 14; Shutoff valve 16
In the gas shut-off device 10 having the gas shut-off valve control means 14, the gas alarm 12
2a is continuously generated for a predetermined first gas leakage allowable time 14c, and if the power failure state continues for a predetermined continuous power failure allowable time 14d, regardless of the presence or absence of the gas leakage alarm signal 12a, the gas The gas shut-off device 10 is configured to give a shut-off command 14a to the shut-off valve 16 to execute a control for shutting off a flow of gas flowing in the gas supply path 18.

According to the first aspect of the present invention, even if the gas alarm 12 is not provided with a backup power supply, the control for interrupting the flow of the gas flowing through the gas supply path 18 even in a power failure state is performed. This can be performed on the shut-off valve 16.

As a result, it is possible to prevent a gas leakage state under a power failure state.

The invention according to claim 2 has a gas leak time counting means 20 for counting the time during which the gas alarm 12 emits the gas leak alarm signal 12a and generating gas leak duration data 20a. And the shut-off valve control means 14
Is configured to generate a power failure duration counting command 14b for counting the duration of a power failure when the gas leakage duration data 20a exceeds the first gas leakage allowable time 14c. The gas shut-off device 10 according to claim 1, characterized in that:

According to the second aspect of the present invention, by using the gas leak time counting means 20, it becomes easy to set and change the first allowable gas leak time 14c.
Further, control for shutting off the flow of gas flowing through the gas supply passage 18 in accordance with the first allowable gas leakage time 14c can be performed on the shutoff valve 16.

As a result, it is possible to prevent the gas leakage state under the power failure state according to the first gas leakage allowable time 14c.

According to the third aspect of the present invention, there is provided a power outage time counting means 22 for counting the power outage duration and generating power outage duration data 22a upon receiving the power outage duration counting command 14b, The shut-off valve control means 14 generates the gas leakage state without exceeding the second allowable gas leakage time 14e after the gas leakage state continues beyond the first allowable gas leakage time 14c without occurrence of the power failure state. In this case, regardless of the presence or absence of the gas leak alarm signal 12a, the gas shutoff command 14a is given to the shutoff valve 16 so that the gas supply path 18
The gas shut-off device 10 according to claim 2, wherein the gas shut-off device 10 is configured to execute a control for shutting off a flow of gas flowing through the gas shut-off device.

According to the third aspect of the invention, by using the power failure time counting means 22, it is easy to set and change the continuous power failure allowable time 14d. Further, the control of shutting off the flow of the gas flowing through the gas supply passage 18 according to the addition time of the first gas leakage allowable time 14c and the continuous power failure allowable time 14d can be performed on the shutoff valve 16. Become like

As a result, the gas leakage state under the power failure state is defined as the first gas leakage allowable time 14c and the continuous power failure allowable time 1
Blocking can be achieved in accordance with the addition time with 4d.

The invention described in claim 4 is the first to third aspects of the present invention.
It is a power failure processing method used for the gas shut-off device 10 according to any one of the above, wherein after the gas leakage state continues beyond the first gas leakage allowable time 14c, the power failure state becomes the continuous power failure allowable time 14d. In the event that the gas alarm occurs, the gas supply path 18
A step of executing control for shutting off the flow of gas flowing through the shut-off valve 16.

According to the fourth aspect of the present invention, even if the gas alarm 12 is not provided with a backup power supply, the control for interrupting the flow of gas flowing through the gas supply passage 18 even under a power failure state is performed. This can be performed on the shut-off valve 16.

As a result, it is possible to prevent a gas leakage state under a power failure state.

According to a fifth aspect of the present invention, the gas leakage state is reduced to the first gas leakage allowable time 14 without the occurrence of a power failure state.
c, the second gas leakage allowable time 14
e, the gas alarm 1
5. The method according to claim 4, further comprising the step of executing control for shutting off the flow of gas flowing through the gas supply path to the shutoff valve 16 irrespective of the behavior of (2). is there.

According to the fifth aspect of the present invention, the flow of the gas flowing through the gas supply path 18 is cut off in accordance with the addition time of the first allowable gas leak time 14c and the second allowable gas leak time 14e. Control can be performed on the shut-off valve 16.

As a result, it is possible to prevent the gas leak state under the power failure state according to the addition time of the first gas leak allowable time 14c and the second gas leak allowable time 14e.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram for explaining an embodiment of a gas shut-off device 10 according to the present invention.

This gas shut-off device 10 is a gas shut-off device 10 for preventing gas leakage. As shown in FIG.
2a for generating a gas leak alarm signal 1
2a, a shut-off valve control means 14 for generating a gas shut-off command 14a for preventing a gas leak state, and a gas flow path 18 interposed in the gas feed path 18 and flowing through the gas feed path 18 in response to the gas shut-off command 14a. It has a shutoff valve 16 for shutting off, a gas leak time counting means 20 for counting gas leak time, and a power failure time counting means 22 for counting the duration of power failure,
The gas alarm 12 sends a gas leak alarm signal 12a to a predetermined first
If the power failure state continues for the predetermined continuous power failure allowable time 14d after the gas leakage continuous time 14c has been continuously generated, the gas shutoff command 14a is sent to the shutoff valve 16 regardless of the presence or absence of the gas leak warning signal 12a. Giving the gas supply path 18
And has a function of executing control for interrupting the flow of gas flowing through the air.

More specifically, an embodiment of the gas shut-off device 10 will be described.

The gas alarm 12 is operated by electric power (ie, 100 V
When no AC is supplied (that is, in a power outage state), a signal voltage of 0 V is output, and when power is normally supplied and a gas leak state is not detected. A function of outputting a signal voltage of 6V and continuously outputting a signal voltage of 12V as a gas leak alarm signal 12a when a gas leak state is continuously detected when power is normally supplied. Have.

Further, since the gas alarm 12 is driven by a 100 V AC power supply, no backup power supply (that is, a 100 V AC power supply) is provided. That is, in the case where the power failure state continues under the gas leakage state), 0 V is always applied regardless of whether the gas leakage state is detected or not.
Is continuously output, and it is impossible to detect a gas leak state.

The shut-off valve control means 14 determines that the power failure state continues after the gas alarm 12 continuously emits the gas leak alarm signal 12a for the predetermined first gas leakage allowable time 14c and continues for the predetermined continuous power interruption allowable time 14d. In the event of occurrence, regardless of the presence or absence of the gas leak alarm signal 12a, a gas shutoff command 14a is given to the shutoff valve 16 to execute a control to shut off the flow of gas flowing through the gas supply path 18. .

The first allowable gas leak time 14c is 1
Although set to about 0 seconds, the present invention is not limited to this, and can be appropriately changed as desired.

Although the continuous power interruption allowable time 14d is set to about 30 seconds, the invention is not limited to this, and can be appropriately changed as desired.

Further, the shut-off valve control means 14 is a 24V and 6V DC power supply device realized by a large-capacity capacitor or battery as a backup power supply at the time of power failure (that is, when 100 V AC is not supplied). .

Each function of the shut-off valve control means 14 can be realized by an electronic circuit disclosed as a conventional technique. Further, the present invention can be realized by a microcomputer mainly configured with a RAM, a CPU, an input / output interface, and the like.

By providing such a shut-off valve control means 14, even if a backup power supply is not provided in the gas alarm device 12, the control for shutting off the flow of the gas flowing through the gas supply passage 18 is cut off even under a power failure state. This can be performed on the valve 16.

As a result, a gas leakage state under a power outage state (that is, a dangerous state caused by a continuous gas leakage state)
Can be prevented.

The gas leak time counting means 20 has a function of counting the time during which the gas alarm 12 emits the gas leak alarm signal 12a and generating gas leak duration data 20a.

At this time, the shut-off valve control means 14 determines that the gas leakage continuation time data 20a is the first allowable gas leakage time 14c.
In this case, a power failure continuation time counting command 14b for counting the duration of the power failure is generated when the number of power failures is exceeded.

Each function of the gas leakage time counting means 20 can be realized by an electronic circuit disclosed as a conventional technique. Further, the present invention can be realized by a microcomputer mainly configured with a RAM, a CPU, an input / output interface, and the like. Also,
In the case of realizing the microcomputer, it is possible to share the microcomputer resources by incorporating the gas leakage time counting means 20 into the shut-off valve control means 14.

By using such a gas leak time counting means 20, it becomes easy to set and change the first gas leak allowable time 14c. Further, the gas supply path 18
Control for shutting off the flow of gas flowing through the shut-off valve 16 in accordance with the first gas leakage allowable time 14c can be executed.

As a result, it is possible to prevent the gas leakage state under the power failure state according to the first gas leakage allowable time 14c.

The power failure time counting means 22 has a function of counting the duration of the power failure and generating the power failure duration data 22a when receiving the power failure duration counting command 14b.

At this time, when the power failure continuation time data 22a exceeds the continuous power failure allowable time 14d, the shutoff valve control means 14 sends the gas shutoff command 14a to the shutoff valve 16 regardless of the presence or absence of the gas leak alarm signal 12a. Giving the gas supply path 18
It is configured to execute a control for interrupting a flow of gas flowing through the apparatus.

Each function of the power failure time counting means 22 can be realized by an electronic circuit disclosed as a conventional technique. Further, the present invention can be realized by a microcomputer mainly configured with a RAM, a CPU, an input / output interface, and the like.

When realized by a microcomputer, the gas leakage time counting means 20 is provided with a power failure time counting means 22.
, It is also possible to share microcomputer resources.

In the same manner, the microcomputer resources can be shared by incorporating the gas leakage time counting means 20 and the power failure time counting means 22 into the shut-off valve control means 14.

By using such a power failure time counting means 22, it is easy to set and change the continuous power failure allowable time 14d. Further, the flow of the gas flowing through the gas supply path 18 is determined by adding the first gas leakage allowable time 14c and the continuous power interruption allowable time 14d to the addition time (specifically, 40 (= 1)
(0 + 30) seconds), the shutoff valve 16
Can be executed for

As a result, the gas leakage state under the power failure state is defined as the first gas leakage allowable time 14c and the continuous power failure allowable time 1
Blocking can be achieved in accordance with the addition time (about 40 seconds) with 4d.

Next, the gas shut-off device 10 will be described with reference to the drawings.
An embodiment of a power failure processing method used in the embodiment will be described.

FIG. 2 is a flowchart showing a power failure processing method used in the gas cutoff device 10 of FIG.

In the power failure processing method, after the gas leakage state continues for more than the first gas leakage allowable time 14c (specifically, about 10 seconds), the power failure state is changed to the continuous power failure allowable time 14d.
(Specifically, about 30 seconds),
It has a first step of executing control for shutting off the flow of gas flowing through the gas supply path 18 to the shutoff valve 16 irrespective of the behavior of the gas alarm device 12.

According to the first step, the control for shutting off the flow of the gas flowing through the gas supply passage 18 even in the event of a power failure, even if a backup power supply is not provided in the gas alarm 12, is provided. Can be executed for

As a result, a gas leakage state under a power outage state (that is, a dangerous state caused by a continuous gas leakage state)
Can be prevented.

In the power failure processing method, in addition to the first step, even after the power failure state is completed without exceeding the continuous power failure allowable time 14d, the gas leakage state is changed to the second gas leakage allowable time 14e.
(Specifically, about 35 lines), if it occurs continuously, regardless of the behavior of the gas alarm 12, the control to shut off the flow of gas flowing through the gas supply path 18 is performed on the shutoff valve 16. And a second step of executing.

According to the second step, the flow of the gas flowing through the gas supply path 18 is calculated by adding the first gas leakage allowable time 14c and the second gas leakage allowable time 14e to each other (specifically, The control for shutting off in response to 45 (= 10 + 35) seconds can be performed on the shutoff valve 16.

As a result, it is possible to prevent the gas leak state under the power failure state according to the addition time (about 45 seconds) of the first gas leak allowable time 14c and the second gas leak allowable time 14e.

More specifically, an embodiment of the power failure processing method will be described.

In the first step, after the gas leakage state has continued beyond the first allowable gas leakage time 14c (about 10 seconds) (that is, step S1 → step S2 → step S3 → (step S3-1 → ) Y) of step S3, when the power outage state occurs beyond the continuous power outage allowable time 14d (about 30 seconds) (that is, Y in step S3)
→ Step S4 → Step S9 → Step S10 → (Step S11 →) Y of Step S10), gas alarm 1
Regardless of the behavior of 2, the control for interrupting the flow of the gas flowing through the gas supply path 18 is performed on the shutoff valve 16 (that is, Y in step S10 → step S8).

Further, in the second step, the gas leakage state does not occur and the first gas leakage allowable time 14
c (ie, step S1 → step S2 → step S3 (step S3-1) → step S4 → N in step S4), and the second allowable gas leakage time 14
e (approximately 35 lines) when the error occurs continuously (that is, N in step S4 → step S5 → step S6 →
(Step S7 →) Y in step S6, gas alarm 1
Regardless of the behavior of 2, the control for interrupting the flow of the gas flowing through the gas supply path 18 is executed for the shutoff valve 16 (that is, Y in step S6 → step S8).

As described above, according to the present embodiment,
Even if a backup power supply is not provided in the gas alarm device 12, control for shutting off the flow of gas flowing through the gas supply path 18 can be executed for the shutoff valve 16 even in a power failure state.

As a result, it is possible to prevent a dangerous state caused by a gas leak state under a power failure state.

[0060]

According to the first aspect of the present invention, even when a backup power supply is not provided in the gas alarm device, the control for shutting off the flow of the gas flowing through the gas supply path even in the event of a power failure is performed. Can be executed for

As a result, it is possible to prevent a gas leak state under a power failure state.

According to the second aspect of the present invention, the use of the gas leak time counting means makes it easy to set and change the first allowable gas leak time. Further, control for shutting off the flow of the gas flowing through the gas supply path according to the first allowable gas leakage time can be performed on the shutoff valve.

As a result, it is possible to prevent the gas leakage state under the power failure state according to the first allowable gas leakage time.

According to the third aspect of the present invention, by using the power failure time counting means 22, it is easy to set and change the continuous power failure allowable time. Further, control for shutting off the flow of gas flowing through the gas supply path according to the addition time of the first gas leakage allowable time and the continuous power failure allowable time can be executed for the shutoff valve.

As a result, it is possible to prevent the gas leakage state under the power failure state according to the addition time of the first gas leakage allowable time and the continuous power failure allowable time.

According to the fourth aspect of the present invention, even when a backup power supply is not provided in the gas alarm device, the control for shutting off the flow of the gas flowing through the gas supply path even in a power failure state is performed on the shutoff valve. Can be executed.

As a result, it is possible to prevent a gas leak state under a power failure state.

According to the fifth aspect of the present invention, the flow of the gas flowing through the gas supply path is controlled by the first gas leakage allowable time and the second gas leakage time.
Control to shut off in accordance with the time added to the gas leakage allowable time can be executed for the shutoff valve.

As a result, it is possible to prevent the gas leak state under the power failure state according to the addition time of the first gas leak allowable time and the second gas leak allowable time.

[Brief description of the drawings]

FIG. 1 is a functional block diagram for explaining an embodiment of a gas shut-off device of the present invention.

FIG. 2 is a flowchart illustrating a power failure processing method used in the gas shut-off device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas shut-off device 12 Gas alarm 12a Gas leak alarm signal 14 Shut-off valve control means 14a Gas shut-off command 14b Power cut-out duration counting command 14c First gas leak allowable time 14d Continuous power cut allowable time 14e Second gas leak allowable time 16 Shut-off valve 18 Gas supply path 20 Gas leak time counting means 20a Gas leak duration data 22 Power failure time counting means 22a Power failure duration data

Claims (5)

[Claims] 1. A gas alarm device for continuously generating a gas leak alarm signal while sensing a gas leak condition, and generating a gas shutoff command for preventing the gas leak condition in response to the gas leak alarm signal. In a gas shut-off device having a shut-off valve control means and a shut-off valve interposed in a gas supply path and receiving a gas cut-off instruction to shut off a flow of gas flowing in the gas supply path, the shut-off valve control means includes a gas alarm device. If the power failure state continues for a predetermined continuous power failure allowable time after continuously emitting the gas leak warning signal for a predetermined first gas leakage allowable time, regardless of the presence or absence of the gas leak warning signal, A gas shut-off device which is configured to give a gas shut-off command to the shut-off valve and execute control for shutting off a flow of gas flowing in the gas supply path. 2. A gas leak time counting means for counting a time during which the gas alarm is emitting the gas leak alarm signal and generating gas leak duration data, wherein the shut-off valve control means comprises The power failure duration counting command for counting the duration of a power failure when the leakage duration data exceeds the first gas leakage allowable time is configured to be generated. The gas shut-off device according to claim 1. 3. A power failure time counting means for counting the duration of the power failure and generating power failure duration data when receiving the power failure duration counting command, wherein the shutoff valve control means determines whether the power failure state is If the gas leakage state continues beyond the first allowable gas leak time and continues to exceed the second allowable gas leak time without occurrence, regardless of the presence or absence of the gas leak alarm signal, The gas shut-off device according to claim 2, wherein the gas shut-off valve is provided with the gas shut-off command to execute a control for shutting off a flow of gas flowing in the gas supply path. . 4. A power outage processing method used in the gas shut-off device, wherein a power outage state occurs after the gas leakage state continues beyond the first gas leakage allowable time and exceeds the continuous power outage allowable time. The method according to any one of claims 1 to 3, further comprising the step of executing, on the shutoff valve, control for interrupting the flow of gas flowing in the gas supply path, regardless of the behavior of the gas alarm device. A power outage treatment method used in the gas shut-off device according to any one of the preceding claims. 5. When the gas leakage state continues beyond the first gas leakage allowable time and continues beyond the second gas leakage allowable time without the occurrence of the power failure state,
The power outage processing method according to claim 4, further comprising the step of: