JPS61164570A - 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 Industrial Application The present invention relates to a gas shutoff device for preventing accidents involving fuel gases such as city gas and LP gas.

2. Description of the Related Art A conventional gas cutoff device of this type is disclosed in, for example, Japanese Patent Application Laid-open No. 59-18
As shown in Publication No. 84, it had a configuration as shown in FIG.

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 the 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 a. Solenoid valve 3
When the return detection circuit 4 is restored, a return signal is inputted to the control circuit 2 from the return detection circuit 4, 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 Laid-Open No. 58-88
535 Publication). Further, as this abnormality sensor, for example, an electric shock device disclosed in Japanese Patent Application Laid-Open No. 58-62645 is used.

Problems to be Solved by the Invention However, with such a configuration, especially one that uses an electric shock 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 7. Since the return detection circuit 70FET4A shown in FIG. 2 is in an on state when there is no return signal (negative voltage) from the solenoid valve 3, current flows from the control circuit 2 through the FET4A. 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 is to use a switch equipped with an externally operable switch and an ON signal from this switch to generate a cutoff signal and input it to the main control unit. a timer that outputs a stop signal to the control circuit that starts operation in response to the cut-off signal and stops power supply to the recovery detection circuit after a predetermined time; and an external display from the time the cut-off signal is generated to the time the stop signal is generated. A display section for performing the following is provided.

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

When an externally operable switch is operated and turned on, the cutoff signal generating section 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 cut off, and the power supply to the recovery detection circuit will be stopped after a predetermined period of time, eliminating unnecessary battery consumption. It is easy to know from the display unit whether or not the predetermined time has elapsed, and it can be easily determined whether or not the solenoid valve can 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 an abnormality sensor such as an electric shock device, which outputs an abnormality signal when an abnormality is detected. 7 is a main control section, which is configured as follows. First, there is a flow cutoff signal generator 8 that determines whether or not to shut off based on the signal from the flow rate sensor 1 and outputs a shutoff signal when the shutoff is determined, and a flow cutoff signal generator 8 that determines whether or not to shut off based on the signal from the abnormality sensor 6 and outputs a shutoff signal when the shutoff is determined. an AND gate 10 which receives as input the cut-off signals from the flow cut-off signal generator 8 and the abnormal cut-off signal generator 9, and the cut-off signal from the cut-off signal generator 15, which will be described later.
%The transistor 11 driven by the output of the AND gate 10, the output of the AND gate 10 are set inputs, and the output is input to the latch 12 which is the power supply for the return detection circuit 4, the output of the return detection circuit 4, and the output of timer 1B, which will be described later. OR gate 1 whose output is the reset input of latch 12
Consists of 3. 14 is a reed switch as a 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 an on signal from the switch 14; 16
It is composed of a timer and a monomulti 17 which is triggered by the output of the timer 16 and whose output is the output of the cutoff signal generator 15.

A tire 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 composed of a latch 20 whose set input is a cutoff signal from the monomulti 17 and whose reset input is a 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-sist cutoff signal (Lo times signal). This cutoff signal causes the output of the AND gate 10 of the main control section 7 to go Lo, turning on the transistor 11 and turning on the solenoid valve 3. The output of the AND gate 10 becomes Lo, so the latch 12 is set and power supply to the return 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 2o of the display section 2o is set by a cutoff signal from the monomulti 17, and power is supplied to the light emitting diode 21 for external display. When the timer 180 has elapsed a predetermined time (for example, one minute), a stop signal is output from the timer 18, and this stop signal becomes a reset input to the latch 12 via the OR gate 13 of the main control section 7, and resets the latch 12. Therefore, power supply to the recovery 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 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
Since the light emitting diode 21 lights up at the same time as the light emitting diode 21 operates, it is possible to know with certainty that the cut-off state has been reached. After that, the magnet is removed and the reed switch 14 is turned off to carry out transportation. The predetermined time (for example, 1
(minutes) have 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. Further, even if the abnormality sensor 6 operates during transportation, the abnormality cutoff signal generating section 9 stops operating since the stop signal of the timer 18 is used as a reset input, and therefore does not output a cutoff signal. After installation, when the magnet is brought close from the outside again, the reed switch 14 is turned on again, the cutoff signal generator 15 outputs the cutoff signal again, and the output I/iLo of the AND gate 10 of the main control section 7 is set, and the latch 12 is set and reset again. Power supply to the detection circuit 4 starts. Furthermore, the latch 20 of the display section 19 is set, power supply starts to the light emitting diode 21, and 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. Return faith J
Since i+ becomes a reset input for the latch 12 via the OR gate 13, power supply to the recovery detection circuit 4 is stopped.

Effects of the Invention As mentioned above, according to the Zero-Hatsu 11, even if an abnormality sensor responds during transportation, by operating a switch in advance, the power supply to the recovery detection circuit is automatically stopped, thereby eliminating wasteful use of the battery. Moreover, since the display section displays the information from the time the switch is operated until the power supply to the return detection circuit is stopped, it is easy to determine whether or not the solenoid valve can be returned manually.

[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...
- Abnormality sensor, 7... Main control section, 14...
... Reed switch, 15 ... Cutoff signal generation section, 18 ... Timer, 19 ... Display section.

Claims (1)

[Claims] At least an abnormality sensor that generates an abnormal signal when an abnormality is detected, a main control unit that outputs a cutoff signal based on the abnormality 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 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 the on state of the switch and outputs a cutoff signal to the main control section. a timer that outputs a stop signal to the main control unit that starts its operation in response to the cutoff signal from the cutoff signal generator and stops power supply to the recovery detection circuit after a predetermined time; and the cutoff signal. A gas cutoff device comprising: a display section that displays an external display in response to a cutoff signal from a signal generating section and stops the external display in response to a stop signal from the timer; and a battery as a power source for the device.