JPS61263463A - Gas blocking apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gas cutoff device that prevents accidents involving fuel gases such as city gas and LP gas, and which can remotely open and close a gas passage.

2. Description of the Related Art A conventional shutoff device of this type has an open structure as shown in FIG. 2, for example.

A magnet is provided in the part of the gas meter 1 that responds to the measuring part 2,
A magnetic field detector that detects the magnetic field of this magnet is used as the flow rate sensor 3. The signal from the flow rate sensor a becomes a flow rate signal corresponding to the gas flow rate, and is inputted to the control section 4. An abnormality signal from an external sensor 5 such as a gas leak alarm or a seismic sensor that detects an abnormality and outputs an abnormality signal when an abnormality is detected is also input to the control unit 4. The control unit 4 determines the presence or absence of an abnormality in the flow rate and the presence or absence of an abnormality in the external environment from the flow rate signal and the abnormality signal, and when it is determined that there is an abnormality, drives the shutoff unit 6 to shut off the gas passage. A self-holding manual return type solenoid valve is used for the shutoff section 6. - The cutoff section 7, which is in the gear-shift disconnected state, is returned to the open state by manually operating the return means. When a self-holding manual return type solenoid valve is manually reset, a back electromotive force is induced at both ends of its operating coil, and this back electromotive force is input to the control unit 4 as a return signal. Upon receiving this return signal, the control section 4 drives the cutoff section 6 again to cut off the gas passage if there is a flow rate signal within a predetermined time. If a gas appliance was in use at the time of the first shutoff, if the shutoff section 6 was left open in this state, raw gas would be released from the gas appliance, which would be dangerous. It is necessary to shut off the power again.

The control section 4 had a configuration as shown in FIG.

The flow cutoff determination unit 8 receives the flow rate signal from the flow rate sensor 3 and determines whether or not the flow rate exceeds a predetermined criterion such as the maximum flow rate within a certain period of time or the longest duration time determined for each flow rate category. Determine the presence or absence of.

That is, if the determination criteria are exceeded, it is determined that there is an abnormality and a flow cutoff signal is output. The external cutoff determination unit 9
Upon receiving an abnormality signal from the external environment, the presence or absence of an abnormality in the external environment is determined based on whether or not the abnormality signal duration time exceeds a predetermined criterion.

That is, if the abnormal signal continues for the above-mentioned abnormal signal duration time, it is determined that there is an abnormality and an external cutoff signal is output. The return cutoff determination unit 10 receives a return signal indicating a change in the cutoff state of the cutoff unit 6 from the cutoff state to the open state, and determines whether the flow rate sensor 3 has passed within a predetermined time.
The presence or absence of a flow rate signal is monitored, and if there is a flow rate signal, a return cutoff signal is output. The drive signal generation section 11 outputs a drive signal to the cutoff section 6 when any of the above-mentioned cutoff signals is input. If the cutoff section 6 is a self-holding manual return type solenoid valve, this drive signal is one and seventy pulses. A battery 12 is used as a power source.

The above-mentioned flow rate sensor a1 control section 4, cutoff section 6, return means 7
The gas meter 1 is integrally constructed with the gas meter 1, and can be installed simply by replacing a normal gas meter with the gas meter 1 equipped with a shutoff device, making the installation work easy. Further, if the external sensor 5 is not attached, wiring work is not required.

Furthermore, since it uses batteries as a power source, it is always in operation regardless of whether there is a power outage or not, making it highly safe.

Problems to be solved by the invention However, there are problems with the gas cutoff device having such a configuration.
Therefore, it is not possible to meet the following demands.

That is, when attempting to open and close a gas passage using this device from a location away from the gas meter 1, for example indoors, the following will occur. That is, for example, if a remote switch is provided at the exchange of the external sensor 5 and an attempt is made to open or close the gas passage using this switch, the switch is turned to the closed side and an abnormal signal from the external sensor 5 is detected. This can be achieved by generating the same signal and inputting it to the control section 4. However, it is necessary to manually operate the return means in order to open the shut-off section 6 that has been in the gear-shift disconnected state. Therefore, although it is possible to close the gas passage from within the room, in order to open it, the return means 7 of the gas meter 1 must be manually operated, which is inconvenient.

Therefore, the present invention aims to make it possible to easily open and close the gas passage using a remote switch, and to ensure the same safety as the conventional gas shutoff device.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention makes the cut-off part an energized open type cut-off part, and the cut-off part is controlled by a remote switch installed indoors, etc. and a switch part provided in the control part. The control section is equipped with a return detection section that controls the power supply to the shutoff section, detects the change of the cutoff section from closed to open, and outputs a return signal to the return cutoff determination section and the switch section. The control section is provided with a reset signal generation section that outputs a reset signal from the above to the switch section.

Function: With the above-described configuration, the present invention opens and closes the cutoff section via the switch section of the control section using, for example, a remote switch provided indoors. In other words, if you turn the remote switch from the open side to the closed side, the power supply to the cutoff section via the switch section will be stopped.
The shutoff section shuts off the gas passage. In this state, when the remote switch is turned from the closed side to the open side, power supply to the cutoff section via the switch section is started, and the gas passage is opened. At the same time, this change from closed to open is detected by the return detection section, and a return signal is output. In response to this return signal, the return cutoff determining section starts operating and checks whether a flow rate signal is input within a predetermined time. If a flow rate signal is input, a return cutoff signal is output, and the reset signal generator receives this and outputs a reset signal. The switch section is reset by this reset signal, power supply to the cutoff section is stopped, and the gas passage is cut off again. In this state, when all the gas valves are closed and the remote switch is turned to the close side and then to the open side, this change is detected by the return detection section and a return signal is output.

This return signal is input as a set signal to the switch section, the switch section is set, power supply to the cutoff section starts, and the gas passage becomes open again.

Embodiment FIG. 1 is a block diagram showing an embodiment of the locking device of the present invention. Reference numeral 13 denotes a remote switch installed indoors, etc., which includes a power source 14, a switch 15 that turns on and off the power supply from the power source 14 to the cutoff section 22, and a display section 16 that responds to display signals from the display control section 21 of the control section 17. Configure. The control unit 17 differs from the control unit 4 of the conventional device in the following points. ■
A return detection section is provided that detects a change in the switch 16 from off (closed) to on (open) and outputs a return signal to the return cutoff determination section 10 and the switch section. (2) A reset signal generating section 19 is provided which receives the flow cutoff signal from the flow cutoff determination section 8, the external cutoff signal from the external cutoff determination section 9, and the return cutoff signal from the return cutoff determination section 10 and outputs a reset pulse. (2) A latching relay 20 is provided as a switch unit that uses a reset signal as a set input and a reset pulse as a reset input. (2) A display control section 21 is provided which outputs a cut-off display signal when a reset pulse is input, and outputs a return display signal when a return signal is input. Reference numeral 22 denotes an energized open type solenoid valve as a cutoff section, which opens the gas passage in an open state during power supply, and enters a cutoff state when power supply is stopped.

Next, the operation in this embodiment will be explained. switch 1
5 is in the on state (open signal), power is supplied from the power supply 14 to the solenoid valve 22 via the latching relay 20, so that the solenoid valve 22 is open and the gas passage is in the open or - state. When the switch 15 is turned off (close signal) in this state, power supply from the power source 14 to the solenoid valve 22 is stopped, the solenoid valve 22 is closed, and the gas passage is cut off. When the switch 15 is turned on again from this state, power is supplied to the solenoid valve 22 and the gas passage becomes open. A change from a close signal to an open signal of the switch 15 is detected by a return detection section 18, and a return signal is output. Based on this return signal, the return cutoff determination unit 10
checks whether a flow rate signal is input within a predetermined time. Further, since the return signal is inputted to the display control section 21, the display control section 21 outputs a return display signal, and in response to this signal, the display section 16 displays a return display to the outside to notify that the gas appliance should not be used yet. When a flow rate signal is input within a predetermined time, the return cutoff determination unit 10 outputs a cutoff signal, indicating that there is a gas appliance in an open state and that raw gas may be released. As a result, the reset signal generator 19 generates a reset pulse. The latching relay 20, which is a switch section, is turned off by this reset pulse, and the power supply to the solenoid valve 22 is stopped. As a result, solenoid valve 2
2 blocks the gas passage. Upon input of the reset pulse, the display control section 21 outputs a cutoff display signal, and thereby the display section 16 displays to the user that the cutoff section 22 is blocking the gas passage.

After closing the open gas appliance, when the switch 15 is turned off and then turned on, this change is detected by the return detection section 18 and a return signal is output. Since this return signal serves as a set input for the latching relay 20, which is a switch section, the latching relay 20 is turned on again, power supply to the electromagnetic valve 22 is started, and the gas passage is opened. The return cutoff determination unit 10 outputs a safety pulse if a flow rate signal is not input within a predetermined time. On the other hand, since the return signal is input, the display control unit 21 outputs the return display signal and displays the display unit 1.
6 displays externally that the solenoid valve 22 has been restored. In response to the safety pulse from the return cutoff determination section 10 after a predetermined period of time, the display control section 21 stops outputting the display signal, and the display section 16 stops displaying.

The shutoff based on the flow rate signal from the flow rate sensor 3 and the abnormality signal from the external sensor is similar to the conventional gas shutoff device.

As a result, not only can the gas passage be opened and closed simply by operating the switch 16, but the return/shutoff determining section 10 operates each time the solenoid valve 22 of the shutoff section changes from closed to open, thereby reducing the risk of releasing raw gas. do not have.

In addition, when the power source 14 is generated from a commercial power source, the solenoid valve 22 in the cut-off section is cut off due to a power outage, but when the power outage returns, the solenoid valve 22 returns to the open state. Since the change to is input to the return detection unit 18, the return cutoff determination unit 10 operates. It is safe because the passage can be blocked off.

The display unit 16 also shows the gas passage cut-off state and the electromagnetic valve 22.
This is convenient because after recovery, the recovery monitoring state is displayed within a predetermined time period during which the recovery/interruption determining unit 10 monitors the flow rate signal.

As described above, according to the present invention, it is convenient to be able to easily open and close the gas passage from a location away from the gas meter, such as indoors. It also prevents raw gas from being released from the gas appliance when it is opened, and the safety level can be the same as that of conventional gas shutoff devices.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a gas cutoff device according to an embodiment of the present invention, Fig. 2 is a schematic configuration diagram 1 of a conventional gas cutoff/device, and Fig. 3
The figure is a block diagram of the same device. 3...Flow rate sensor, 8...Flow rate cutoff determination unit, 10...Return cutoff determination unit, 12...
...Battery, 13...Remote switch, 17...
...control section, 18...return detection section, 19.
...Reset signal generation section, 20... Switch section, 22... Cutoff section. Name of agent: Patent attorney Toshio Nakao and one other person\+
--First! +1

Claims (1)

[Claims] a flow rate sensor that outputs a flow rate signal according to the gas flow rate;
a remote switch equipped with a switch that outputs at least an opening/closing signal for turning on and off the power supply to the cutoff section; a control section that receives the flow rate signal and the open/close signal from the remote switch as input and outputs on/off of the power supply to the cutoff section; and a shutoff unit that opens the gas passage when power is supplied from the control unit and shuts off the gas passage when power is not supplied, and the control unit determines whether or not there is an abnormality based on the flow rate signal, and when determining the abnormality, a flow cutoff determination section that outputs a flow cutoff signal; a return detection section that detects a change in power supply from the remote switch from no to present and outputs a return signal; a return cutoff determination section that outputs a return cutoff signal to which a flow rate signal from a flow rate sensor is input between, a reset signal generation section that outputs a reset signal when the flow cutoff signal or the return cutoff signal is input; A gas cutoff device comprising a switch unit that turns off power supply from a remote switch to the cutoff valve when a signal is input, and turns on power supply from the remote switch to the cutoff valve when the return signal is input, and a control unit power supply. Device.