JPH032426B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leak alarm device, and in particular to a gas leak alarm device that sends a signal using piping through which fluid such as gas passes when a gas leak detector detects a gas leak. It is related to the device.

Gas leaks of flammable gases and toxic gases can lead to accidents, so there are gas leak alarm devices that detect these gas leaks and issue alarms. These alarm devices include those that issue an alarm when a gas leak is detected by a detector, those that issue an alarm at the location where the gas leak is detected, those that send a signal to a central monitoring device and issue an alarm in a control room, and those that issue an alarm in a control room when a gas leak is detected. There are devices that automatically shut off the gas flow path by sending a signal to a gas shutoff device that shuts off the gas flow path.

Among these, all gas detectors that send an alarm signal when a gas leak is detected send and receive signals through electrical wiring installed independently of the gas piping. However, installing such independent electrical wiring is not only expensive compared to the gas leak alarm itself, but also general consumers avoid it because it spoils the aesthetics of the living room. It tends to happen. This is an obstacle to the widespread use of gas leak alarm devices.

This invention was made in view of the above-mentioned points, and when a gas leak detector detects a gas leak and sends an alarm signal, the gas leak detector detects a gas leak and sends an alarm signal without using an independent electrical wiring. To provide a gas leak alarm device in which an alarm signal is sent by sending and receiving sound using a fluid such as gas as a medium between an installed sound generator and a reception control device having a microphone installed in the same pipe. The purpose is to The present invention will be explained below based on the drawings.

FIG. 1 is a diagram showing an example in which a gas leak alarm device according to an embodiment of the present invention is used in a gas cutoff device. In the figure, 1 is a wall, indoor 2 and indoor 2
or partition between indoor 2 and outdoor 3. 4 is a gas leak detector that detects gas leaks, and is installed on the wall or ceiling of room 2. 5 is a transmission control device;
When the gas leak detector 4 detects a gas leak and emits an alarm sound, a signal sound is emitted in response to the alarm sound. Reference numeral 6 denotes a gas cutoff device equipped with a reception control device, which receives a signal sound emitted by the transmission control device 5 and is activated to shut off the gas flow path. 7 is gas consumption equipment such as stove, 8
9 is an indoor gas pipe, 9 is an outdoor gas pipe, and 10 is a meter.

FIG. 2 is an enlarged view of the transmission control device 5 and gas cutoff device 6 shown in FIG. In the figure, A is a microphone, which receives an alarm sound when the gas leak detector 4 shown in FIG. 1 detects a gas leak and emits an alarm sound by a buzzer or the like. B is an amplifier that amplifies the output of the microphone A, and C is a sound generator such as a buzzer that receives the output signal from the amplifier B and emits a sound, and the frequency is selected to allow easy propagation within the indoor gas pipe 8. D indicates the indoor gas piping 8, the outdoor gas piping 9, etc. E is a microphone that receives the sound emitted from the sound generator C, F is an amplifier that amplifies the output of the microphone E, and G is a gas circuit breaker that receives the output signal from the amplifier F and blocks the gas flow path. be. Microphone E and amplifier F constitute a reception control device.

The above is the configuration when the gas leak alarm device according to an embodiment of the present invention is used as a gas cutoff device.Next, its operation will be explained.

When a gas leak occurs, the gas leak detector 4 detects it and issues an alarm using a buzzer or the like. This alarm sound is received by the microphone A of the transmission control device 5, the output of the microphone A is amplified by the amplifier B, and a signal sound is emitted from the sound generator C into the gas pipe D. This signal sound propagates through the gas in the pipe as a medium and is received by microphone E. The output of microphone E is amplified by amplifier F and operates gas circuit breaker G to shut off the gas flow path. .

In the above embodiment, an example is shown in which the gas pipe D is used, but the pipe is not limited to a gas pipe, and may be a pipe that passes a fluid such as oil or water, as long as it propagates a signal sound. Further, in the above embodiment, in order to transmit the signal from the gas leak detector 4 to the sound generator C, the alarm sound generated by the gas leak detector 4 is transmitted to the microphone A.
However, instead of this, the alarm signal generated by the gas leak detector 4 may be transmitted to the acoustic generator C in the form of an electrical signal or an optical signal using a communication line or an optical fiber. good. Also, the sound generator C
However, it is also possible to use frequencies outside the audible frequency range.

Incidentally, in the above, there is a risk that a sound will be generated and a malfunction will occur if an object falls into the gas pipe D or the like, but this can be easily solved by using a generally known specific signal selection means. For example, the frequency of the sound generated by the sound generator C may be set to a specific value, the level may be set above a certain level, or a combination of these may be used. On the other hand, the receiving control device equipped with microphone E uses a filter to select only specific frequencies, uses a comparator to consider sounds below a certain level as noise, or only selects sounds that last a certain period of time. If necessary, well-known means such as inputting signals can be employed to easily distinguish between noise and desired signals.

As explained above, the gas leak alarm device according to the present invention includes a gas leak detector that detects a gas leak and issues an alarm signal, and a gas leak detector that is installed in a pipe through which a fluid such as gas is passed and receives the alarm signal and makes a signal sound. The system consists of a sound generator that emits a sound, and a reception control device that is installed in the same pipe at a location away from the sound generator and has a microphone that receives the signal sound that is emitted from the sound generator. When the detector detects a gas leak and sends an alarm signal, it can send the signal sound using gas piping without using electrical wiring, making the gas leak alarm system inexpensive and damaging the aesthetics of the room. Not only can it be installed without any problems, but it also does not require electrical wiring, which can be a problem during installation, so it is extremely effective when used in industrial pipelines, etc.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example in which a gas leak alarm device according to an embodiment of the present invention is used in a gas cutoff device, and FIG. 2 is a partially enlarged sectional view of FIG. 1. In the figure, 4 is a gas leak detector, 5 is a transmission control device, 6 is a gas cutoff device, 7 is a gas consumption device, 8 is an indoor gas pipe, 9 is an outdoor gas pipe, A and E are microphones, B is an amplifier, C is a sound generator, D is a gas pipe, F is an amplifier, and G is a gas circuit breaker.

Claims (1)

[Claims] 1. A gas leak detector that detects gas leaks and issues an alarm signal, and an acoustic generator that is installed in a pipe through which a fluid such as gas passes and receives a signal from the gas leak detector and generates a required signal sound. A gas leak alarm device comprising: a reception control device having a microphone installed at a position away from the acoustic generator in the same piping and receiving a signal sound emitted from the acoustic generator.