JPH0731352Y2 - Adapter for gas leak alarm - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a gas leak alarm capable of preventing the gas leak alarm from ringing due to a cause other than gas leak by a simple manual operation. The present invention relates to a dexterity adapter.

[Conventional technology]

Conventionally, a gas leak alarm device having an initial ringing prevention circuit is known. This will be described with reference to the block diagram of FIG.

In FIG. 5, reference numeral 21 is a power transformer, commercial power is applied to the primary side, gas sensor 22, comparator 23,
An alarm circuit 24, an alarm unit 25 such as a piezoelectric buzzer and a speaker, an initial ringing prevention circuit 26, etc. are connected. 27 indicates a power plug, and 20 indicates the entire gas leak alarm.

When the gas leakage exceeds a predetermined value, an output is output from the comparator 23, but the alarm circuit 24 does not operate immediately due to the action of the initial ringing prevention circuit 26, and when the time set by the initial ringing prevention circuit 26 has elapsed, the alarm circuit 24 operates and causes the alarm unit 25 to ring.

The initial ringing prevention circuit 26, when the power plug 27 is connected to the commercial power supply, causes the alarm unit 25 to ring in the same way as when there is a gas leak, so it is a kind of timer provided to prevent this. The gas leak alarm 20 is activated when the gas leak alarm 20 is used or when the power plug 27 is unplugged and connected to the commercial power again to prevent unnecessary ringing. Since the initial ringing prevention circuit 26 itself is known, its details are omitted.

[Problems to be solved by the device]

When the gas sensor 22 is sprayed with an insecticide while the gas leak alarm 20 is in use, the alarm unit 25 is activated and sounds. There was a problem that the power plug 27 of the gas leak alarm 20 had to be pulled out in order to stop the ringing.

The present invention has been made to solve the above problems, and provides an adapter for a gas leak alarm that can stop unnecessary ringing and can automatically recover by using an initial ringing prevention circuit. With the goal.

[Means for Solving the Problems]

The gas leak alarm adapter according to the present invention is provided with a switch means that operates by a simple manual operation to temporarily stop the power supply to the gas leak alarm and then automatically recovers.

[Action]

In this invention, when the switch means is manually operated from the outside when the insecticide or the like is sprayed, the power supply to the gas leak alarm is temporarily cut off, and then the switch means is automatically restored. As a result, the initial ringing prevention circuit is activated, the ringing of the alarm unit is stopped for a predetermined time, and no false alarm is issued.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
In this figure, reference numeral 10 denotes the adapter of the present invention, and switch means for automatically restoring the power supply section 11 and the switch section 12
13 are made up. 14 is a power plug to which a commercial power source is connected, 15 is an outlet, and the power plug 27 of the gas leak alarm 20 is inserted.

Next, the operation will be described.

Insert the power plug 14 of the adapter 10 into the outlet of the commercial power supply, and plug the power leak 27 of the gas leak alarm 20 into the outlet 15.
Insert. At this time, the initial ringing prevention circuit shown in FIG.
By the action of 26, the alarm unit 25 does not operate, and unnecessary ringing is prevented. This completes the installation.

Now, in the case where the gas leak alarm 20 is accidentally sprayed with an insecticide or the like, if the switch means 13 is operated from the outside for a short time, the power supply to the gas leak alarm 20 is temporarily cut off. Then, the power is supplied again by the automatic recovery of the switch means 13. Therefore, the ringing of the alarm unit 25 can be suppressed for a predetermined time by the action of the initial ringing prevention circuit 26 of the gas leak alarm 20. In the meantime, the insecticide gas and the like flow out, so that false alarms are prevented from occurring.

FIG. 2 is a circuit diagram of the adapter 10 when the simplest mechanical switch 12A is used as the switch section 12 of the switch means 13. In this figure, sp is a spring and switch
After pressing 12A to disconnect the circuit, when the hand is released, it automatically recovers.

In FIG. 3, a touch type switch 12B is used as the switch section 12 of the switch means 13. In this figure, TP is a touch panel, D _{1 to} D ₄ are diodes, C is a capacitor, and R ₁ to
R ₄ is a resistor and INV ₁ and INV ₂ are inverters. Also, PC
Is a photocoupler, which includes a light emitting diode LED and a phototransistor (not shown). G is ground, V _cc
Indicates a power source.

This operation will be described. Before touching the touch panel TP, the potential at point (a) is at "H" level,
Point (b) is at "L" level, capacitor C is a resistor
Discharge through R ₃ and diode D ₄ , and point (c) is at “L” level. Therefore, the output of the inverter INV ₂ , that is, the point (d) is at the “H” level, and the light emitting diode LED is off.

Touching the touch panel TP detects hum (50 / 60Hz) from the power line, and the potential at point (a) repeats "H" level and "L" level at the same cycle as the hum of the power source. The point (b) has a phase opposite to that of the point (a), and the “L” level and the “H” level are repeated, and after being rectified by the diode D ₃ and the capacitor C, the potential at the point (c) is the “H” level, The point (d) becomes the "L" level, and the light emitting diode LED emits a signal.
This signal turns off the power supply unit 11 in FIG. 1 and turns off the power supply to the gas leak alarm 20. When the hand is released from the touch panel TP, the touch switch 12B is immediately restored. After that, as described with reference to FIG. 1, the initial ringing prevention circuit 26 (5th
(Fig.) Operates to prevent false alarms.

FIG. 4 shows an example in which an optical switch 12C is used as the switch section 12 of the switch means 13. In FIG. 4, R _{1 to} R ₁₃ are resistors, C _{1 to} C ₄ are capacitors, D _{1 to} D ₅ are diodes, and INV ₁ to
INV ₆ is an inverter, Q is a transistor, LED ₁ and LED ₂ are light emitting diodes, PT is a phototransistor, SH is a separating plate, is an oscillation circuit section, is an optical sensor section, is a single light elimination section and a signal amplification section. , Is the waveform shaping section, is the rectifier circuit,
Is a signal transmitter.

Next, the operation will be described.

The light emitting diode LED ₁ is constantly blinking, but the structure is such that it does not directly enter the phototransistor PT. That is, for example, a separation plate SH is provided or the light emitting diode LE
D ₁ and the phototransistor PT are directed upward so as not to directly receive light emission. Therefore, the light emitting diode LED ₂ does not emit light. C ₂ is a coupling capacitor that removes the signal of single light such as natural light, and passes only the alternating current portion of pulsed light.

Now, when the hand M is brought closer, the light of the light emitting diode LED ₁ becomes the hand M.
Is reflected by the phototransistor PT and enters the inverter.
The output of INV ₆ becomes “L”, the light emitting diode LED ₂ lights up and emits a signal. Therefore, the power supply to the gas leak alarm 20 is cut off as in the embodiment shown in FIG. If you release your hand M, it will recover immediately.

Although the light emitting diode is used for signal transmission in the above, it may be a transistor.

[Effect of device]

As explained above, this device operates by a simple manual operation to prevent the gas leak alarm from ringing due to a cause other than gas leak, such as accidentally spraying insecticide etc. on the gas leak alarm. Since the switch means for automatically recovering after the power supply to the gas leak alarm is temporarily stopped is provided, the initial ringing prevention circuit in the gas leak alarm operates by simply operating the switch means externally and a false alarm is issued. Can be prevented. Therefore, there is a practical effect that not only the configuration is extremely simple and the operation is easy, but also the existing gas leak alarm can be easily applied.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
2, 3, and 4 are circuit diagrams respectively showing various embodiments of the switch portion of the switch means used in the present invention,
FIG. 5 is a block diagram showing an example of the configuration of a conventional gas leak alarm with an initial ringing prevention circuit. In the figure, 10 is an adapter, 11 is a power supply unit, 12 is a switch unit, 13 is a switch means, 14 is a power plug, 15 is an outlet, 20 is a gas leak alarm, 22 is a gas sensor, 25 is an alarm unit, and 26 is an alarm unit. An initial ringing prevention circuit, 27 is a power plug.

Claims (1)

[Scope of utility model registration request] 1. An adapter having an outlet for supplying power to a gas leak alarm equipped with an initial ringing prevention circuit, the adapter being operated by a manual operation to temporarily stop the power supply to the gas leak alarm. A gas leak alarm adapter, which is provided with a switch means for automatically recovering after the start.