JPH07280127A - Gas circuit breaker device - Google Patents

Abstract

PURPOSE:To reduce a manual inspection work for an isolation valve by automatically opening and closing the valve. CONSTITUTION:This device is equipped with a control section 10 for sending an inspection start signal to a flowrate measurement means 1 for the periodical inspection of an isolation valve 2 using an external signal, as well as a reporting signal when no inspection completion signal is not received within the preset time, together with a valve drive section 3 to open and close the valve 2 upon receipt of a no-gas flow signal from the means 1 and a valve close state detecting section 5 to detect the open/close state of the valve 2 according to a closing signal from the section 3 and to output a reset demand signal when the valve is in close state. Also, the device is equipped with a valve open state detecting section 6 to actuate the section 3 for the opening operation of the valve 2 according to the reset demand signal from the section 5, and to detect the open/close state of the valve 2 according to an open drive signal from the section 3 for sending an inspection completion signal to the control section 10, when the valve 2 is in open state, as well as a reporting means 12 for actuating a reporting device, upon receipt of a reporting signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff device for preventing gas accidents.

[0002]

2. Description of the Related Art Conventionally, in this type of gas shutoff device, 2 in FIG. 3 is a shutoff valve for opening and closing a gas passage, 1 is a flow rate measuring means for measuring the flow rate corresponding to the flow rate of passing gas, and 3 is a shutoff valve. A drive unit for opening and closing 2 is a gas meter to which the shut-off valve 2 and the flow rate measuring means 1 are attached, 12 is a notifying means for notifying the outside of the gas meter 4 that the gas passage is blocked, and 13 is a gas meter. 4 is an external return means for instructing to open the shut-off valve 2, and 30 is a means for operating the valve drive unit 3 to close the shut-off valve 2 when the flow rate measuring means 1 causes an abnormality in the gas flow rate, and the informing means 12 is an external means. It is configured by the control unit 30 that gives an instruction to notify. When the shutoff valve 2 is to be inspected regularly, a staff member checks each household to see if no gas is used, shuts off the gas passage by the external shutoff means 11, and shuts off the shutoff valve by the external return means 13. It was supposed to return 2 and check.

[0003]

However, in the above-mentioned conventional configuration, the staff members check the opening and closing of the shutoff valve 2 after confirming whether or not the households are using gas, and there is a shortage of manpower these days. However, there was a problem that it was labor intensive.

In order to solve the above problems, it is an object of the present invention to automatically close and open the valve to reduce manual inspection work of the shutoff valve.

[0005]

In order to achieve the above object, a first means of a gas shutoff device of the present invention is a flow rate measuring means for measuring the presence or absence of a passing gas flow rate, and a shutoff for opening and closing a gas passage. A valve, a control unit that outputs an inspection start signal to the flow rate measuring means for performing a periodic inspection of the shutoff valve by a signal from the outside, and then outputs a notification signal if there is no inspection end signal within a predetermined period, A valve drive unit that opens and closes the shutoff valve in response to a gas flow rate non-existing signal from the flow rate measurement unit, and detects the open / closed state of the shutoff valve by a close drive signal from the valve drive unit and returns if closed. A valve closed state detection unit that outputs a request signal, and the valve drive unit is operated by the return request signal from the valve closed state detection unit to open the shutoff valve, and the open drive signal from the valve drive unit is used to open the shutoff valve. Check the open / closed state of the shutoff valve A valve opening state detection unit to send a test end signal to the controller if open it, in which a notification means for operating the informing device to receive the broadcast signal.

According to a second aspect of the present invention, in addition to the above configuration, the control unit inspects the shutoff valve by an inspection start signal for each predetermined period counted by the timer counting unit instead of an external signal. Is configured to be performed automatically.

[0007]

According to the first means, the gas shutoff device of the present invention can automatically open and close the shutoff valve in response to a signal from the outside to inspect the shutoff valve to reduce the periodical inspection work of the shutoff valve.

In addition, by the second means, it is possible to further reduce the inspection work by automatically performing the periodic inspection by the timer counting section instead of the signal from the outside by the timer counting unit.

[0009]

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

First, the gas shutoff device of the first embodiment is a flow rate measuring means 1 for measuring the presence / absence of a passing gas flow rate by a lead SW, an MR sensor, etc., a shutoff valve 2 for opening and closing a gas passage, and an external signal. Periodic inspection of the shutoff valve 2 by the inspection instruction signal of the shutoff valve 2 received by the receiving means 14 from the outside (such as to surely shut off when the shutoff event is established, and to surely return when the restoration event is established about once every six months. There is a control unit 10 that outputs an inspection start signal to the flow rate measuring means 1 in order to automatically perform the inspection) and then outputs a notification signal if there is no inspection end signal within a predetermined period. The flow rate measuring means 1 which has received the inspection start signal confirms the presence or absence of the gas flow rate and outputs a gas flow rate non-existence signal if the gas does not flow. If the gas is flowing, the inspection of the shutoff valve 2 is stopped, and the information is communicated to the outside, which is the center that supplies the gas for fuel and outputs the inspection instruction signal of the shutoff valve 2.

Upon receipt of the gas flow rate non-existence signal, the valve drive section 3 outputs a closing drive signal to the shutoff valve 2 and the valve closed state detection section 5. The shutoff valve 2 that has received the closing drive signal closes, the valve closed state detection unit 5 measures the inductance of the shutoff valve 2, detects the open / closed state of the shutoff valve 2, and outputs a return request signal if closed. . The valve drive unit 3 operates the valve drive unit 3 in response to the return request signal from the valve closed state detection unit 5, and this time the shutoff valve 2
Then, an open drive signal is output to the valve open state detector 6 to open the shutoff valve 2. When the shutoff valve 2 receives the open drive signal, the shutoff valve 2 is driven to open, the valve open state detection unit 6 measures the inductance of the shutoff valve 2, detects the open / closed state, and if open, sends an inspection end signal to the control unit 10.

When the control unit 10 which has output the inspection start signal cannot receive the inspection end signal from the valve open state detection unit 6 within a predetermined period (for example, within 10 seconds), the notification unit 1
The shut-off valve abnormality signal is output to 2. The notifying means 12 that has received the shutoff valve abnormality signal sends the shutoff valve 2 to the center through communication or the like.
Abnormality warning is issued. Further, when the control unit 10 that has output the inspection start signal can receive the inspection end signal from the valve open state detection unit 6 within a predetermined period (for example, within 10 seconds), a normal shutoff valve signal is sent to the notification unit 12. Output. The notification means 12 that has received the shutoff valve normal signal notifies the center of the operation of the shutoff valve 2 by communication or the like.

Further, in the gas shutoff device of the second embodiment, as shown in FIG. 2, the control section 20 has a timer counting section 15, and instead of an external signal, a predetermined period counted by the timer counting section 15. It is configured to automatically inspect the shutoff valve 2 by an inspection instruction signal every (for example, once every six months), and an inspection end signal is received within a predetermined period after receiving the inspection instruction signal and outputting the inspection start signal. If there is no shutoff valve abnormality signal, the notification means 1 receives the shutoff valve abnormality signal
2 issues a warning of abnormality of the shutoff valve 2 to the center by communication or the like. Further, when the flow rate measuring means 1 which receives the inspection start signal cannot detect the no flow rate state, it goes to detect the no flow rate state at a time interval of a few hours, and when the no flow rate state is detected, The above event is repeated by the gas meter 4 itself. Therefore, in the first embodiment, it is possible to eliminate the disadvantage that the center repeatedly communicates with a large number of gas meters 4 in the absence of the flow rate and requires a large number of lines due to excessive communication.

As described above, according to the above-mentioned embodiment, there is an effect that the inspection work of the shutoff valve 2 is reduced by automatically closing and opening the valve.

[0015]

As is apparent from the above description, according to claim 1 of the gas shutoff device of the present invention, the opening / closing performance of the shutoff valve can be confirmed by a signal from the outside. Since it is not necessary to inspect the shutoff valve, the shutoff valve inspection work can be automated and remotely controlled.

Further, according to the second aspect of the present invention, the inspection work can be further reduced by automatically performing the periodic inspection by the gas shut-off device itself by the signal of the timer counting section every predetermined period.

[Brief description of drawings]

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

FIG. 2 is a control block diagram showing a gas shutoff device according to another embodiment of the present invention.

FIG. 3 is a control block diagram of a conventional gas shutoff device.

[Explanation of symbols]

 1 flow rate measuring means 2 shutoff valve 3 valve drive section 4 gas meter 5 valve closed state detection section 6 valve open state detection section 10 and 20 control section 12 notification means 15 timer count section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadanori Shirasawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A flow rate measuring means for measuring the presence or absence of a flow rate of a passing gas, a shutoff valve for opening and closing a gas passage, and a periodical check of the shutoff valve by a signal from the outside. A control unit that outputs a signal and then outputs a notification signal if there is no inspection end signal within a predetermined period, and a valve drive unit that receives and outputs a gas flow rate non-existing signal from the flow rate measuring unit to open and close the shutoff valve. , A valve closing state detection unit that detects the open / closed state of the shutoff valve by a closing drive signal from the valve drive unit and outputs a return request signal if closed, and a return request signal from the valve close state detection unit A valve that sends the inspection end signal to the control unit by operating the valve drive unit to open the shutoff valve, detecting the open / closed state of the shutoff valve based on an open drive signal from the valve drive unit, and opening if detected. Open state detection unit and the notification Gas cutoff apparatus and a notifying means for actuating the alarm device receives the issue. 2. The gas shutoff device according to claim 1, wherein the control unit automatically inspects the shutoff valve in response to an inspection start signal counted by the timer counting unit instead of an external signal every predetermined period.