JPH0731353Y2 - Power plug 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. It relates to a dexterous power plug.

[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. 2, 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.

That is, if you leave the power plug pulled out,
When a gas leak actually occurs, there is a problem that the gas leak alarm does not operate and the original purpose of the gas leak alarm cannot be achieved.

The present invention has been made to solve the above-mentioned problems, and provides a power plug for a gas leak alarm that can stop unnecessary ringing and can automatically recover by using an initial ringing prevention circuit. The purpose is to

[Means for Solving the Problems]

The power plug for the gas leak alarm according to the present invention is operated by a manual operation to prevent the gas leak alarm from ringing due to a cause other than gas leak, and after temporarily stopping the power supply to the gas leak alarm, It is equipped with a switch for automatic restoration.

[Action]

In this invention, when the switch 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 schematic diagram showing an embodiment of the present invention. In this figure, reference numeral 0 is a power plug of the present invention, which replaces the power plug 27 of FIG. 2 and includes a switch 11. The switch 11 is composed of contacts 12 and 13, a contact piece 14, a pressing piece 15, a fixing member 16 and a spring 17, and the contact piece 14 normally connects the contacts 12 and 13 by the spring 17. By pressing the pressing piece 15 against the spring 17, the contacts 12 and 13 become non-conductive, and when the pressing is released, the contact piece 14 is automatically restored by the force of the spring 17.

Next, the operation will be described.

The power plug 10 is inserted into a commercial power outlet to supply power to the gas leak alarm 20. At this time, the alarm unit 25 does not operate due to the action of the initial ringing prevention circuit 26 shown in FIG. 2, and unnecessary ringing is prevented. This completes the installation.

Now, if you accidentally sprayed the gas leak alarm device 20 with pesticides, etc., if you manually operate the switch 11 for a short time, the power supply to the gas leak alarm device 20 will be interrupted once. Then, the power is supplied again by the automatic restoration of the switch 11. Therefore, the ringing of the alarm unit 25 is 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.

[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. A switch that automatically restores power after temporarily stopping the power supply to the gas leak alarm is provided, so the initial ringing prevention circuit in the gas leak alarm operates by simply operating this switch manually. And false alarms can be prevented. Therefore, there is a practical effect that the configuration is extremely simple and the operation is easy.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the construction of an embodiment of the present invention, and FIG.
FIG. 1 is a block diagram showing an example of the configuration of a conventional gas leak alarm device with an initial ringing prevention circuit. In the figure, 10 is a power plug, 11 is a switch, 20 is a gas leak alarm, 22 is a gas sensor, 25 is an alarm unit, and 26 is an initial ringing prevention circuit.

Claims (1)

[Scope of utility model registration request] 1. A power plug for supplying power to a gas leak alarm equipped with an initial ringing prevention circuit, the plug being activated by a manual operation and temporarily stopping power supply to the gas leak alarm. A power plug for a gas leak alarm, which is equipped with a switch for automatic restoration.