JPH024298Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an open/close display circuit that electrically displays the open/close status of a gas tank.

[Conventional technology]

In order to prevent accidents caused by gas leaks, gas leak alarms are already being used to detect gas leaks and notify the user with sounds. It can only be detected after a certain amount of leakage has occurred.
This is not very preferable from the point of view of reliably preventing gas leakage.

It is well known that a major cause of gas leaks is that the gas tank is left open after using gas, and by promptly closing the gas tank after using gas, accidents caused by gas leaks can be prevented. It can be drastically reduced.

However, the operation of closing the gas tank, especially the gas main valve, each time gas is used is often forgotten when people are preoccupied with other things.

In order to prevent the gas tank from being forgotten to close, a switch that is turned on and off by opening and closing the closure and a closure open indicator light are connected in series between the power supply.
An open/close display circuit has been proposed in which an indicator light is turned on while the shutter is in the open position.

[Problem that the invention attempts to solve]

By the way, in a structure where a switch and an indicator light are connected in series between the power supplies, if a break occurs in the circuit or the voltage of the power supply drops, the indicator light will turn off and the state will be the same as when the switch was closed. There is a problem in that it is not possible to reliably display the opening of a power supply, and it is also impossible to know about accidents such as disconnections and power outages.

This invention was made in order to solve the above-mentioned problems, and the purpose is to provide an open/close display circuit for a gas tank that can indicate the occurrence of a circuit break or a power outage.

[Means for solving problems]

In order to solve the above problems, this invention connects a switch that turns on and off by opening and closing the closure, a constant voltage diode, and a closure open indicator light in series between the power supply, and connects the switch in parallel with the switch. A fault indicator light is connected in parallel with a constant voltage diode and a closed door open indicator light.

[Effect]

When the gas cock closure is in the closed position, the switch is turned off and the closure open indicator light goes out to indicate that the gas cock is in the closed state.

At this time, current flows to the fault indicator light through the resistor connected in parallel with the switch, indicating that the circuit is working normally, and the open indicator light does not light up due to the action of the constant voltage diode.

When the gas tip is placed in the open position, the switch turns on and the gas tip open indicator light lights up, indicating that the gas tip is in the open position.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

FIG. 1 shows an outline of the display circuit, and FIG. 2 shows the specific structure of the same.

In FIG. 1, a display circuit 2 is connected to both terminals of a switch 1 to electrically display whether the switch 1 is on or off, and the output signal of the display circuit 2 is used to control a device operation circuit 3. There is.

The switch 1 is set on the gas tank so that it can be turned on and off by opening and closing the gas tank's closing member.

Specifically, a limit switch is placed on the outside of the knob, and a protrusion or recess provided on the knob turns the switch on and off at the open/closed position of the closure. A reed switch is made to correspond to a rotating permanent magnet, and the reed switch is turned on and off by the magnetic force of the permanent magnet.

In Fig. 2, a switch 1, a resistor 5, a constant voltage diode 6, and a light emitting diode 7 serving as a closed door open indicator light are connected in series between the power supply 4, and a resistor 8 is connected in parallel with the switch 1. , a resistor 9 and a light emitting diode 10 are connected in parallel with the constant voltage diode 6 and the light emitting diode 7. Note that the light emitting diode 10 serves as a failure indicator for the display circuit.

The resistor 8 inserted in parallel with the switch 1 forms a closed circuit with the resistors 5 and 9 and the light emitting diode 10, and even when the switch 1 is off, the light emitting diode 10 lights up with a low current flowing through it, and the display circuit is normal. If a power outage or a break in the circuit occurs, the light emitting diode 10 will turn off, so you can know this.

Now, when you move the gas kottok to the closed position,
As shown in FIG. 2, the switch 1 is in the off state, and the light emitting diode 7 is
Since no current is applied to the gas tank, the light emitting diode 7 turns off, indicating that the gas tank is in a closed state.

At this time, the light emitting diode 10 is connected through the resistor 8.
energizes, and its lighting indicates the normal status of the circuit.

Next, when the gas tank is opened, the switch 1 is turned on, and current flows through the constant voltage diode 6 to the light emitting diode 7, which lights up to indicate that the gas tank is in the open state.

Therefore, if the light emitting diode 7 is lit after the gas appliance is used, it indicates that the gas tank remains open and warns the user to close it immediately.

When the gas tank is closed, the switch 1 is turned off and the light emitting diode 7 is turned off.

〔effect〕

As described above, according to this invention, a resistor is connected in parallel to the switch that turns on and off when the gas tank is opened and closed, and a closed circuit is formed with the failure indicator light, so that the indicator light is turned on when the indicator circuit is in a normal state. lights up,
If a power outage or disconnection occurs, the indicator light goes out, so it is possible to reliably detect the occurrence of a failure in the circuit that indicates whether the gas tank is open or closed by turning the switch on or off by opening or closing the shutter. This greatly improves gas leakage prevention.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a display circuit according to this invention, and FIG. 2 is a specific circuit diagram of the same. 1 is a switch, 4 is a power supply, 5, 8, 9 are resistors,
6 is a constant voltage diode, 7 is an open indicator light emitting diode, and 10 is a fault indicator light emitting diode.

Claims (1)

[Scope of utility model registration request] A switch that is turned on and off by opening and closing the closure, a constant voltage diode, and a closure open indicator light are connected in series between the power supplies, and a resistor is connected in parallel with the switch.
A gas tank open/close indicator circuit that connects a constant voltage diode, a closed door open indicator light, and a failure indicator light in parallel.