JPH07286676A - Gas shut-off device - Google Patents

Abstract

PURPOSE:To reduce manual inspecting work of a shut-off valve by automatically opening/closing the valve. CONSTITUTION:An inspection start signal is outputted by means of an internal timer to a flow rate measuring means 1 for routine inspection of a shut-off valve 2. A gas shut-off device is provided with a control unit 10 outputting an information signal if an inspection finish signal is not detected within the predetermined time after the output of the inspection start signal, a valve driving unit 3 carrying out open/close driving of the shut-off valve 2 by receiving a gas flow rate no-detection signal from the flow rate measuring means 1, and a valve closed condition detecting unit 5 detecting an opened/closed condition of the shut-off valve 2 on the basis of a close driving signal from the valve driving unit 3 and outputting a return demand signal if it is in a closed condition. The device is also provided with a valve opened condition detecting unit, which operates the valve driving unit 3 on the basis of the return demand signal from the valve closed condition detecting unit 5 for opening the shut-off valve 2, detects the opened/closed condition of the shut-off valve 2 on the basis of the open driving signal from the valve driving unit 3, and sends an inspection finish signal to the control unit 10 if it is opened, and an informing means 12 which receives the information signal for operating an information device.

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 A conventional gas shutoff device of this type is shown in FIG. In FIG. 2, 2 is a shutoff valve for opening and closing the gas passage, 1 is a flow rate measuring means for measuring the flow rate corresponding to the flow rate of the passing gas, 3 is a drive unit for driving the shutoff valve 2 to open and close, and 4 is a shutoff valve 2. And a gas meter to which the flow rate measuring means 1 is attached, 12 is an informing means for informing the outside that the gas passage is blocked, 13 is an external returning means for instructing to open the shutoff valve 2 from outside the gas meter 4, 20 When the flow rate measuring unit 1 has an abnormality in the gas flow rate, the control unit instructs the drive unit 3 to operate, the shutoff valve 2 to close, and the notification unit 12 to notify the outside. When the shutoff valve 2 is to be inspected regularly, a staff member confirms whether or not gas is used around each home, and the external shutoff means 11 shuts off the gas passage, and the external restoration means 13 shuts off the shutoff valve 2. It was supposed to be restored and checked.

[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 first timer unit that outputs a signal every predetermined period, a second timer unit that receives a signal from the first timer unit every predetermined period and outputs a signal at a predetermined time, and the second Receiving a signal from the timer section, outputs a test start signal to the flow rate measuring means for performing a periodic test of the shutoff valve, and then outputs a notification signal if there is no test end signal within a predetermined time. 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; and a closing drive signal from the valve drive unit that detects the open / closed state of the shutoff valve to close the shutoff valve. Valve closed state detection unit that outputs a return request signal 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 / close state of the shutoff valve is detected by the open drive signal from the valve drive unit to open the valve. If present, it is provided with a valve open state detecting section for sending an inspection end signal to the control section and an informing means for receiving the informing signal and activating the informing device.

[0006]

According to the above means, the gas shutoff device of the present invention automatically opens and closes the shutoff valve in response to the signal instructing the inspection at the predetermined intervals by the first and second timers to perform the periodical inspection work of the shutoff valve. Can be reduced.

[0007]

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

First, the gas shut-off device of the first embodiment comprises a flow rate measuring means 1 for measuring the presence or absence of a passing gas flow rate by means of a reed SW, an MR sensor, etc., a shut-off valve 2 for opening and closing a gas passage, and, for example, 1. A first timer unit 15 that outputs a signal for each predetermined period for each long period such as a year and half a year, and a gas for which a predetermined period signal is received from the first timer unit 15 so that gas is relatively unused For example, the second timer unit 16 that outputs a signal for a predetermined time in a time zone from 2 am to 4 am
Then, upon receiving a signal for a predetermined time from the second timer 16 section, a periodical inspection of the shutoff valve 2 is performed (every six months to ensure that the shutoff event is surely shut off and that a return event is surely restored. There is a control unit 10 that outputs an inspection start signal to the flow rate measuring means 1 in order to automatically perform) 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. Further, when the flow rate measuring means 1 receiving the inspection start signal cannot detect the no flow state,
When a no flow state is detected at intervals of 1 or 2 hours, the no gas flow state is detected, and the no gas flow rate signal is output.

Upon receiving the gas flow rate non-existing signal, the valve driving section 3 outputs a closing driving signal to the shutoff valve 2 and the valve closed state detecting section 5. When the shut-off valve 2 receives the closing drive signal, the shut-off valve 2 closes, and the valve-closed state detection unit 5 measures the inductance of the shut-off valve 2, detects the open / closed state of the shut-off valve 2, and outputs a return request signal if closed. To do. 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 time (for example, within 10 seconds), the notification means 1
The shut-off valve abnormality signal is output to 2. The notification means 12 that has received the shutoff valve abnormality signal issues a shutoff valve abnormality warning to the center by communication or the like. 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 time (for example, within 10 seconds), the shutoff valve normal 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.

Therefore, there is an effect that the inspection work of the shutoff valve 2 is reduced by automatically closing and opening the valve.

[0012]

As is apparent from the above description, the gas shutoff device of the present invention has the following advantages.

The opening and closing performance of the shut-off valve can be confirmed by a signal for each predetermined period by the first and second timer portions, and it becomes unnecessary for a staff member to visit each home to inspect the shut-off valve manually.
Therefore, the work of inspecting the shutoff valve can be automatically performed by the gas shutoff device itself.

[Brief description of drawings]

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

FIG. 2 is a control block diagram of a conventional gas shutoff device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow rate measuring means 2 Shutoff valve 3 Valve drive part 4 Gas meter 5 Valve closed state detection part 6 Valve open state detection part 10, 20 Control part 12 Notification means 13 External resetting means 15 First timer part 16 Second timer part

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

Claims (1)

[Claims] 1. A flow rate measuring means for measuring the presence / absence of a flow rate of a passing gas, a shutoff valve for opening / closing a gas passage, a first timer section for outputting a signal at predetermined intervals, and the first timer section. And a second timer section for receiving a signal from the second timer section for outputting a signal at a predetermined time, and an inspection start signal to the flow rate measuring means for receiving a signal from the second timer section to perform a periodic inspection of the shutoff valve. A control unit that outputs a notification signal if there is no inspection end signal within a predetermined time, and a valve drive unit that receives the gas flow rate non-existing signal from the flow rate measurement unit and opens and closes the shutoff valve, The open / closed state of the shut-off valve is detected by a closing drive signal from the valve drive unit, and if closed, a valve closed state detection unit that outputs a return request signal, and the return request signal from the valve closed state detection unit Operate the valve drive to open the shutoff valve The open / closed state of the shut-off valve is detected by the open drive signal from the valve drive unit, and if it is open, the valve open state detection unit that sends the inspection end signal to the control unit and the notification signal is received and notified. A gas shutoff device comprising: a notification means for operating the device.