JPH0137627B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a gas shutoff system that stops the gas supply when an abnormality such as an earthquake or outflow of raw gas occurs in the supply of city gas, propane gas, etc. It is related to the device.

Conventional Structure and Problems There is a conventional gas cutoff device that detects an earthquake and closes a cutoff valve provided in a gas passage, for example, with the structure shown in FIG. In FIG. 1, an abnormality sensor 1 is, for example, a seismic sensor as an earthquake sensor.
The abnormality determination unit 2 receives the abnormality signal from the abnormality sensor 1, determines whether or not to shut off, and outputs a shutoff signal to the electromagnetic valve 7 as a shutoff device when determining the shutoff. The solenoid valve 7 is driven by this cutoff signal and cuts off the gas passage. The abnormality determination section 2 is configured as follows. 3A is a storage unit that stores shutoff conditions, and 3B is a shutoff determination unit that receives an abnormal signal from the abnormality sensor 1 and outputs a shutoff signal when this abnormal signal matches the shutoff condition of the storage unit 3A. It consists of a driver 4 for driving a solenoid valve 7 in response to vibrations, a resistor 5 for reducing the impedance of the circuit including the seismic sensor 1 and making it difficult to pick up external noise, and a battery 6 as a power source for the device. And storage section 3A,
The cutoff determination unit 3B is, for example, a microcomputer 3.
It will be realized and implemented as follows. Here, the cutoff condition is, for example, a condition in which the seismic sensor is turned on for one continuous second or more. When driven by the driver 4, the solenoid valve 7 blocks the gas passage. The solenoid valve 7 is of a one-shot self-holding type in order to reduce battery consumption. That is, when the coil is energized for a predetermined period of time, it enters a closed state and maintains that state. To open the valve, manually return the valve body,
The structure is such that it remains open. In order to avoid the phenomenon in which the battery is consumed by continuing to monitor the state of the seismic sensor with the valve in the closed state and further outputting a cutoff signal, the cutoff determination unit 3B does not operate the seismic sensor 1 after outputting the cutoff signal. does not read the state of On the other hand, this means that the cutoff determination unit 3B
This means that there is a need to make people aware of this.
Therefore, a reed switch 8 is provided as a return detection device for the solenoid valve 7 to detect the position of the valve body. The reed switch 8 is on when the valve is open and off when the valve is closed. Therefore, the change of the reed switch 8 from OFF to ON becomes a return signal, and this signal is input to the cutoff determination section 3B. The disadvantage of this device is that if the seismic sensor 1 remains on, the solenoid valve 7 operates and current continues to flow through the resistor 5 even after it is closed, resulting in unnecessary battery consumption. It is a point.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a gas cut-off device that consumes less current than the conventional gas cutoff device, and thus enables a battery to be used for a long period of time.

Structure of the Invention In order to achieve the above object, the gas cutoff device of the present invention has a structure in which the abnormality determination section is provided with means for controlling power supply to the abnormality sensor, and power is supplied to the abnormality sensor only when the shutoff valve is in an open state. As a result, when the shutoff valve is closed, the power supply to the abnormality sensor is stopped, and the current in the abnormality sensor circuit is always zero when the shutoff valve is closed, reducing its current consumption and reducing battery This has the effect that it can be used for a long period of time.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 9 denotes an abnormality determination section according to the present invention, which differs from the conventional example in that a power supply control section 3C and a switch circuit 10 are added as means for controlling power supply to the abnormality sensor 1. It is. Note that the storage section 3A, the cutoff determination section 3B, and the power supply control section 3C can be easily realized as the microcomputer 11.

The operation of the above configuration will be described below with reference to the timing chart of FIG. time
At t ₁ , the seismic sensor 1, which is an example of an abnormality sensor, turns on and thereafter remains on (FIG. 3A). This on signal is input to the microcomputer 11, and when the shutoff condition stored in the storage section 3A is satisfied at time _t2 (for example, the condition of being on continuously for 1 second or more is satisfied), the shutoff determining section 3B
outputs a cutoff signal (Figure 3B). This cutoff signal causes the cutoff valve 7 to operate at time t ₃ via the driver 4.
The reed switch 8 is turned off (FIG. 3C). At time _t4 , since a predetermined time has elapsed since time _t2 , the cutoff determination section 3B stops outputting the cutoff signal. Until now, the power supply control unit 3C had output a signal to turn on the switch circuit 10, so power was being supplied to the seismic sensor 1, but at time _t5 , it received a cutoff signal from the cutoff determination unit 3B. Power supply control unit 3C
is reset, the switch circuit 10 is turned off, and the power supply to the seismic sensor 1 is stopped (FIG. 3D). Therefore, after time _t5 , there is no input from the vibration sensor to the microcomputer 11. After time _t5 , when the condition that the seismic sensor 1 is on is removed at time _t6 , the seismic sensor 1 is turned off again. After that, if the valve is opened at time _t7 , the reed switch 8 is turned on again.
As a result, the cutoff determination unit 3B recognizes that the circuit has become open, and the power supply control unit 3C is set by the return signal from the reed switch 8, turns on the switch circuit 10 again, and starts power supply to the seismic sensor. do.

In this way, according to this embodiment, while the valve is closed, the power supply to the seismic sensor as an abnormality sensor is stopped, so even if the seismic sensor remains on, the battery is not wasted. It has the effect of no wear and tear.

In the above embodiments, the abnormality sensor is a seismic sensor, but the present invention can also be applied to other abnormality sensors, such as a raw gas sensor that detects raw gas and outputs an abnormal signal. It can be implemented similarly. In addition, in the description of the embodiment, the cutoff determination unit 3
Although the explanation has been made for the case where B and the driver 4, the power supply control section 3C, and the switch circuit 10 are separate, the output drive capacity of the microcomputer 11 that constitutes the cutoff determination section 3B and the power supply control section 3C is If it can be driven sufficiently, it can be omitted.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Reduces battery consumption.

(2) When using the same battery, it can be used for a longer period of time than the conventional example.

(3) When using a battery for the same period of time, a battery with a smaller capacity can be used compared to the conventional example, and the device can be made smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional gas cutoff device, FIG. 2 is a circuit diagram of a gas cutoff device which is an embodiment of the present invention, and FIG. 3 is a timing chart for explaining the operation of the same device. 1...Abnormality sensor, 3A...Storage unit, 3B...
Shutoff determination unit, 3C...Power supply control unit, 7...Solenoid valve, 9...Abnormality determination unit.

Claims (1)

[Claims] 1. A shutoff device installed in a gas passage that shuts off gas supply, an abnormality sensor that detects an abnormality such as an earthquake or raw gas outflow, and an abnormality determination that shuts off the shutoff device in response to an abnormality signal from the abnormality sensor. The abnormality determination unit includes a storage unit that stores cutoff conditions, and a storage unit that determines whether or not an abnormality signal from the abnormality sensor matches the cutoff conditions in the storage unit, and when they match, sends the cutoff device to the storage unit. a cutoff determination unit that outputs a cutoff signal; a power supply control unit that receives the cutoff signal from the cutoff determination unit and stops power supply to the abnormality sensor;
Gas cutoff device with battery as device power source.