JPH0467467B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas shutoff device for preventing accidents involving fuel gases such as city gas and LP gas.

Conventional technology A conventional gas cutoff device of this type is disclosed in, for example, Japanese Patent Application Laid-Open No.
As shown in Publication No. 1884, it had a configuration as shown in Figure 2.

That is, when the signal from the flow rate sensor 1 satisfies a predetermined condition, the control circuit 2 outputs a cutoff signal, and this cutoff signal operates the self-holding manual return type solenoid valve 3 to cut off the gas flow path. Further, the control circuit 2 then supplies power to a return detection circuit 4 which detects the voltage generated when the solenoid valve 3 returns and outputs a return signal, and enters a state of waiting for the return of the solenoid valve 3. When the solenoid valve 3 is restored, a return signal is inputted from the return detection circuit 4 to the control circuit 2, and the control circuit 2 stops supplying power to the return detection circuit 4. In addition to the flow rate sensor 1, an abnormality sensor for detecting an external abnormality may be provided (for example, Japanese Patent Application Laid-Open No. 5-88535). As this abnormality sensor, for example, a vibration sensing device disclosed in Japanese Patent Laid-Open No. 58-62645 is used.

Problems to be Solved by the Invention However, with such a configuration, especially one that uses a seismic device as an abnormality sensor, the device responds to vibrations during transportation or installation and controls the cutoff signal. The circuit 2 outputs an output and starts supplying power to the recovery detection circuit 4. Recovery detection circuit 4 shown in Figure 2
FET4A receives a return signal (negative voltage) from solenoid valve 3.
Since it is in the on state when there is no FET, current flows from the control circuit 2 through the FET 4A. This continues until the solenoid valve 3 is reset after being shut off. This results in unnecessary attempts to extinguish the battery 5 before installation, which shortens the effective operating time of the device.

Therefore, the present invention prevents the battery from being wasted by shutting off the solenoid valve 3 before transportation and supplying power to the return detection circuit 4 for a predetermined period of time.

Means for Solving the Problems The technical means of the present invention for solving the above problems are as follows:
A switch that can be operated from the outside, a cut-off signal generator that generates a cut-off signal based on the ON signal from this switch, and inputs it to the main control unit, and a cut-off signal that starts operation based on this cut-off signal and stops power supply to the recovery detection circuit after a predetermined time. The present invention is provided with a timer for outputting a stop signal to the main control section, and a display section for providing an external display from the time the cutoff signal is generated until the time the stop signal is generated.

Effects The effects of the above-mentioned technical means are as follows.

When an externally operable switch is operated and turned on, the cutoff signal generator outputs a cutoff signal to the main control section. Upon receiving this cutoff signal, the main control section outputs a cutoff signal to the solenoid valve and starts supplying power to the return detection circuit. On the other hand, the timer receives the cutoff signal from the cutoff signal generator, and outputs a stop signal after a predetermined period of time, for example, one minute. The main control section stops power supply to the recovery detection circuit in response to this stop signal.
During this predetermined period of time, the display section is operating to notify that power is being supplied to the recovery detection circuit.

As a result, if the switch is turned on before transportation, the solenoid valve will be in a cutoff state and the power supply to the recovery detection circuit will be stopped after a predetermined period of time, eliminating unnecessary battery consumption. It is possible to easily know from the display section whether or not the time has elapsed, and it can be easily determined whether or not the solenoid valve may be returned manually.

Embodiment FIG. 1 is a block diagram showing an embodiment of the gas cutoff device of the present invention. In FIG. 1, the same numbers as in FIG. 2 indicate the same items. 6 is a vibration sensing device;
When vibration is detected, an abnormal signal is output. 7 is a main control section, which is configured as follows. First, flow rate sensor 1
a flow rate cutoff signal generation unit 8 that determines whether or not to shut off based on the signal from the flow cutoff signal generation unit 8 that outputs a cutoff signal when the cutoff is determined;
An abnormal shutoff signal generation section 9 determines whether or not to shut off based on the signal from the seismic device 6 and outputs a shutoff signal when the shutoff is determined, and shutoff signals from the flow rate cutoff signal generation section 8 and the abnormal shutoff signal generation section 9, which will be described later. An AND gate 10 receives a cutoff signal from a cutoff signal generating section 15, a transistor 11 is driven by the output of the AND gate 10, and the output of the AND gate 10 is used as a set input, and its output is the power supply for the recovery detection circuit 4. The latch 12 is composed of an R gate 13 whose inputs are the output of the return detection circuit 4 and the output of a timer 18, which will be described later, and whose output is the reset input of the latch 12. 14 is a reed switch that can be turned on and off from the outside; 15 is a cutoff signal generator that generates a cutoff signal in response to the ON signal from the switch 14; the output is triggered by the timer 16 and the output of the timer 16; It consists of a mono multi 17 which is the output of 15. A timer 18 is triggered by a cutoff signal from the monomulti 17 and outputs a stop signal after a predetermined time. Reference numeral 19 denotes a display section, which is comprised of a latch 20 whose set input is the cutoff signal from the monomulti 17 and whose reset input is the stop signal from the timer 18, and a light emitting diode 21 driven by the output of the latch 20.

Next, the operation of this embodiment will be explained.
First, when a magnet is brought close to the magnet from the outside before transportation, the reed switch 14 is turned on. This on signal causes the timer 16 to operate, and when the reed switch 14 continues to be on for a predetermined period of time, a time-up signal is output. The monomulti 17 is triggered by this time-up signal and outputs a one-shot cutoff signal (Lo signal).
Output. This cutoff signal causes the main control section 7 to
The output of the AND gate 10 becomes Lo, the transistor 11 is turned on, the solenoid valve 3 is driven, and the gas flow path is cut off. Since the output of the AND gate 10 becomes Low, the latch 12 is set and power supply to the recovery detection circuit 4 starts. On the other hand, the timer 18 is triggered by the cutoff signal from the monomulti 17, and outputs a stop signal after a predetermined time (for example, 1 minute). On the other hand, the latch 2 of the display section 19 is activated by the cutoff signal from the monomulti 17.
0 is set and power is supplied to the light emitting diode 21 for external display. When a predetermined time (for example, one minute) of the timer 18 has elapsed, a stop signal is output from the timer 18, and this stop signal becomes a reset input to the latch 12 via the R gate 13 of the main control section 7, and resets the latch 12. Therefore, power supply to the return detection circuit 4 is stopped. Further, the latch 20 of the display section 19 is reset by the stop signal from the timer 18, and the power supply to the light emitting diode 21 is stopped, so that the light emitting diode 21 is turned off.

As is clear from the above explanation, first, before transportation, when a magnet is brought close to the outside and the reed switch 14 is turned on, the solenoid valve 3 operates and the light emitting diode 21 lights up, so you can be sure that the cut-off state is established. I can do it. After that, the magnet is removed and the reed switch 14 is turned off to carry out transportation. When the predetermined time (for example, 1 minute) set by the timer 18 during transportation has elapsed, the power supply to the recovery detection circuit 4 and the light emitting diode 21 is stopped, and there is no need to waste the battery. Furthermore, even if the seismic device 6 operates during transportation, the abnormal cutoff signal generating section 9 will be activated by the timer 1.
Since the stop signal No. 8 is used as a reset input, the operation is stopped and no cut-off signal is output. After installation, when the magnet is brought closer from the outside again, the reed switch 14 is turned on again and the cutoff signal generator 15 is turned on.
The cutoff signal is output again, and the main control unit 7
The output of the AND gate 10 becomes Low, the latch 12 is set, and power supply to the recovery detection circuit 4 starts again. Furthermore, the latch 20 of the display section 19 is set and power supply starts to the light emitting diode 21, so that the light emitting diode 21 lights up. Since the timer 18 does not output a stop signal while the light emitting diode 21 is lit, if the solenoid valve 3 is reset during this time, the reset detection circuit 4 detects this and sends the flow cutoff signal generator 8 and abnormality cutoff signal generator 9. Send a return signal. Since the return signal becomes a reset input to the latch 12 via the OR gate 13, power supply to the return detection circuit 4 is stopped.

Effects of the Invention As described above, according to the present invention, even if the seismic device responds during transportation, by operating the switch in advance, the power supply to the recovery detection circuit is automatically stopped, thereby eliminating wasteful battery life. In addition, since the display section displays the information from the time the switch is activated until the power supply to the reset detection circuit is stopped, it is easy to determine whether or not it is okay to manually reset the solenoid valve. Since the display section only indicates that the switch has been shut off for a predetermined time period determined by a timer after receiving the shutoff signal from the shutoff signal generation section, the configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a gas cutoff device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional gas cutoff device. 3... Self-holding manual return type shutoff valve, 4... Return detection circuit, 5... Battery, 6... Vibration sensing device, 7...
Main control section, 14...Reed switch, 15... Cutoff signal generation section, 18... Timer, 19... Display section.

Claims (1)

[Claims] 1. A vibration sensing device that generates an abnormal signal when detecting vibration, a main control unit that outputs a cutoff signal based on the abnormal signal, a self-holding manual return type solenoid valve that cuts off the gas flow path based on the cutoff signal, and a return detection circuit that detects the return of the solenoid valve from the closed state to the open state and outputs a return signal to the main control section; a switch that can be turned on and off from the outside; and a switch that detects when the switch is turned on and outputs a cutoff signal to the main control section. a timer that starts operation in response to a shutdown signal from the shutdown signal generation section and outputs a stop signal to the main control section after a predetermined time; The main controller includes a display unit that displays an external display and stops the external display in response to a stop signal from the timer, and a battery that serves as a device power source, and the main control unit generates a cutoff signal to the solenoid valve based on a cutoff signal from the cutoff signal generator. A gas cutoff device that outputs a signal and stops power supply to the return detection circuit based on a stop signal from the timer.