JPS6230156Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leak alarm device that detects gas leaks and issues an alarm.

In a typical prior art, a gas detection element, a buzzer, etc. are incorporated into one unit, and the unit is placed at a location where gas leakage may occur. According to such prior art, it is not possible to detect gas leaks caused by careless misoperation of gas appliances or gas appliances, or gas leaks caused by deficiencies in gas equipment such as piping or appliances. can. A problem with such prior art is that the audible range of the alarm is limited.

Other prior art solutions solve the above-mentioned problem by providing buzzers not only in locations where gas leaks may occur, but also in rooms and other locations away from the locations.

However, none of the above-mentioned prior art works when the power supply is cut off intentionally or due to construction work. Therefore, gas suicides cannot be prevented, and explosions have caused major disasters, especially in apartment complexes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas leak alarm that can widely notify the state of a gas leak even when the power is cut off.

The drawing is an electrical circuit diagram of an embodiment of the present invention. Commercial AC power is always supplied to the apartment complex via the common line 1. In each room of the apartment complex,
As a first power source, power is supplied from a common line 1 to a line 3 via a switch 2 such as a breaker. The line 3 is provided with an outlet 4.

The gas leak alarm according to the present invention basically has the following features:
It includes a main unit 5 provided indoors and an external alarm unit 6 provided in a common area such as a hallway. In the main unit 5, a plug 7 connected to the outlet 4 is connected to a transformer 8.
The gas detection element 9 provided in the main unit 5 is
It is energized by electric power from the transformer 8 and can detect city gas. Such a gas detection element 9 may be made of a conventional semiconductor or one that performs a catalytic combustion reaction.

The output from the gas detection element 9 is input to an amplifier 11 via a variable resistor 10. The amplifier 11 is
The power from the secondary winding 12 of the transformer 8 is transferred to a rectifier circuit 15 consisting of a diode 13 and a capacitor 14.
It is energized by direct current power rectified and smoothed by. This amplifier 11 level-discriminates and amplifies the output from the gas detection element 9 via the variable resistor 10, and when the gas detection element 9 detects city gas,
Energize relay R1. Relay R1 has two relay switches R11 and R12. Relay switch R11 is a so-called a contact that becomes conductive when relay R1 is energized. This relay switch R11 is connected in series with the buzzer B1. A series circuit of relay switch R11 and buzzer B1 is connected in parallel to the primary side of transformer 8. Relay switch R12 is a so-called b contact that is closed when relay R1 is energized and conductive when relay R1 is demagnetized. transformer 8 no 2
One terminal 16 of the next winding 12 is connected to a diode 13
and is connected to one terminal of the electrical connection joint 17 via the relay switch R12. Secondary winding 12
The other terminal 18 of is connected to the other terminal of the electrical connection joint 17 . The electrical connection joint 17 is connected via a signal line 20 to a relay R2 in an external alarm unit 6 installed in a common area such as a hallway. The external alarm unit 6 includes a relay R2.
Another buzzer B2 is connected in series with a relay switch R21 serving as an activation means, which is a so-called b contact that is cut off by the excitation of the relay R2 and turned on by the demagnetization of the relay R2. Relay switch R2
A series circuit of B1 and B2 is connected to a line 19 as a second power source. This line 19 is connected to the common line 1. It can be said that the relay R2 has the function of making the relay switch R21 conductive when the signal line 20 is disconnected, and therefore detecting the connection state of the signal line 20.

A series circuit with relay switch R21 and buzzer B2, relay R2, and signal line 20 are embedded in a wall in a common area such as a hallway of an apartment complex. This allows the second
The structure is such that the power to the line 19 as a power source cannot be easily interrupted. For this purpose, conventional so-called conduit wiring is suitable.

The output voltage of the secondary winding 12 of the transformer 8 is chosen such that the voltage across the signal line 20 is less than 35V. As a result, even people who do not have special qualifications for electrical work will be able to install the gas leak alarm.

During operation, turn on switch 2 indoors,
Assume that the plug 7 is connected to the outlet 4. In this case, when there is no gas leak, amplifier 11 demagnetizes relay R1. Therefore, relay R2 of external alarm unit 6 is energized from secondary winding 12 of main unit 5 via rectifier circuit 15, relay switch R12, electrical connection joint 17 and line 20. Therefore, relay switch R21 is shut off, and buzzer B2 does not generate an alarm sound. Furthermore, the relay switch R11 is cut off by the demagnetization of the relay R1, and therefore the buzzer B1 is in a state in which it does not generate an alarm sound.

When a gas leak occurs and the gas detection element 9 detects gas, the amplifier 11 excites the relay R1. Therefore, relay switch R11 becomes conductive and buzzer B
1 generates an alarm sound indoors. Relay R1
is excited, relay switch R1
2 blocks it. Therefore, relay R2 of external alarm unit 6 is demagnetized, thereby making relay switch R22 conductive, and buzzer B2 is energized by power from line 19 to generate an alarm. This buzzer B2 is installed in a common area such as a hallway of an apartment complex, so that people in the common area can know that a gas leak is occurring indoors.

Assume that the switch 2 is shut off or the plug 7 is removed from the outlet 4 indoors. In this case, the buzzer B1 does not generate an alarm indoors regardless of the switching state of the relay switch R11. By de-energizing relay R2, the relay switch R
21 becomes conductive. As a result, the buzzer B2 generates an alarm sound, which can be heard in the common areas of the apartment complex. In summary, Buzzer B
2 is emitting an alarm sound when (a) the main unit 5 is not energized, or (b) the main unit 5 is energized and a gas leak has occurred. or (c) when the signal line 20 is disconnected. In this way, when the alarm sound from the buzzer B2 is heard in the common area, it can be known that the above-mentioned abnormalities (a), (b), and (c) have occurred.

As described above, according to the present invention, the second alarm generation means energized by the second power supply is configured to generate the first alarm when (a) a gas leak is detected by the gas detection element; (c) When the first power source that energizes the generating means is cut off; and (c) When the signal line between the gas detection element and/or the energization state detecting means and the activation means for the second alarm generating means is disconnected. Since the alarm is activated to generate an alarm in at least one of the above, it becomes possible to know the gas leak with certainty.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram of an embodiment of the present invention. 1...Common line, 5...Main unit, 6...
...External alarm unit, 9...Gas detection element, 11
...Amplifier, 20...Signal line, R1, R2...
...Relay, B1, B2...buzzer.

Claims (1)

[Claims for Utility Model Registration] A gas detection element; a first alarm generating means that is energized by a first power source and generates an alarm when a gas leak occurs in response to the output from the gas detection element; , energization state detection means for the first power supply for detecting the energization state of the first power supply, second alarm generation means energized by the second power supply, means for activating the second alarm generation means, and The activation means includes a connection state detection means for detecting a connection state of the signal line between the gas detection element and/or the energization state detection means and the activation means, and the activation means detects the connection state of the signal line between the gas detection element and/or the energization state detection means and the activation means. ,
In response to the output from the energization state detection means and the output from the connection state detection means, the first 2. A gas leak alarm device characterized by activating two alarm generating means.