JPS63315074A - Earthquake resistant automatic gas blocking apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to gas flow paths when gas is used at the time of an earthquake, and when gas begins to leak after an earthquake occurs. This invention relates to an anti-earthquake automatic gas shut-off device that shuts off the gas.

[Conventional technology]

Gas safety measures in the event of an earthquake include city gas, L
An anti-seismic automatic gas shutoff device will be installed for both P gases.

FIG. 3 is a configuration diagram showing an example of a conventional anti-seismic automatic gas shutoff device, in which 1 is a gas meter, 2 is a gas flow path on the gas inflow side of the gas meter 1, and 3 is a gas flow path on the gas outlet side. It is also formed by gas pipes. Reference numeral 4 indicates the entire anti-seismic automatic gas cutoff device, 5 is a seismic sensor that detects vibrations during an earthquake, and 6 is a gas cutoff valve that cuts off the gas flow path 2 based on a sensing signal generated by the seismic sensor 5. be.

In this way, the conventional anti-seismic automatic gas shutoff device has a seismic sensor 5 installed near the gas flow path 2, and the seismic sensor 5 detects vibrations during an earthquake regardless of whether or not gas is being used. In most cases, an anti-seismic automatic gas cutoff device 4 was used to close the gas flow path 2 on the gas inflow side.

[Problem that the invention seeks to solve]

By the way, since the anti-seismic automatic gas cut-off device 4 is for detecting vibrations during an earthquake, it has a simple structure and is judged to be highly reliable in terms of performance.
Not very popular.

The reason for this is that because the seismic sensor 5 has a single function of simply detecting vibrations and closing the gas flow path, the seismic sensor 5
If a vibration exceeding the set value is applied to the gas flow path 2, the vibration will be detected and the gas flow path 2 will be shut off. Therefore, safety confirmation such as that there is no gas leakage is required before recovery after shutoff. It is necessary to check for leaks in the gas flow path 2.3. Since the gas retailer has to go to the household consuming gas and carry out such a reset operation, there is a problem in that it causes problems in use and hinders its widespread use.

In addition, since the container filled with LP gas is heavy (a 50 kg container weighs about 100 g when delivered), the container tends to be handled roughly when changing the container.
Impact is often applied to the piping system when a container is placed on a container stand. In such a case, the seismic sensor 5 installed in the pipe etc. detects these vibrations and closes the gas flow path 2, so when the container is delivered to a consumer's home without the seismic sensor 5 installed. It was necessary to confirm the operation of seismic sensor 5.

In addition, in the event of an earthquake of a certain size or more, the gas channels 2 of all consumer households in the same area that have earthquake sensors 5 installed will be closed, regardless of whether gas is used or there is a gas leak. This poses a serious challenge for gas dealers in quickly returning to service, and the problem is that it is a labor-intensive process.

This invention was made to solve the above problems, and aims to provide an anti-seismic automatic gas cut-off device that uses a seismic sensor to cut off the gas flow path only when gas is in use or when gas is leaking. purpose.

[Means for solving problems]

The anti-seismic automatic gas shutoff device according to the present invention includes a seismic sensor that senses earthquake vibrations and transmits a sensing signal, and a flow signal transmitter that senses the flow of gas in a gas flow path and transmits a flow signal. , a shutoff signal transmitter that transmits a signal to shut off the shutoff valve when a sensing signal is transmitted from the seismic sensor or when a flow signal is transmitted from the flow signal transmitter within a predetermined time from this point. It is.

[Effect]

In this invention, when an earthquake occurs and a sensing signal is generated from the seismic sensor, if gas is flowing in the gas flow path, the gas flow path is immediately shut off. In addition, if gas is not flowing in the gas flow path, if gas leaks and gas flows into the gas flow path after a predetermined time elapses after the detection signal is generated, the gas flow path is blocked and the gas flow is interrupted. The flow stops.

(Embodiment) FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. Shows the whole. 12 is a flow signal transmitter that senses the gas flow in the gas flow path 2.3 and transmits a flow signal; 13 is a microcomputer that transmits a cutoff signal; 14 is a battery; and 15 is the vibration sensor 5 activated. 16 is a shutoff valve that shuts off the gas flow path 2 on the inflow side by a signal transmitted from the microcomputer 13; 17 is a timer that opens the shutoff valve 16 for a preset time; This is a return safety device.

Next, the operation will be explained.

When an earthquake occurs and a sensing signal is sent from the seismic sensor 5, gas is already flowing through the gas meter 1 and the gas flow path 2.3 due to gas usage, and the flow rate signal from the flow rate transmitter 12 has already been sent to the microcomputer. When 13 is under human power,
The microcomputer 13 immediately issues a cutoff signal to close the cutoff valve 16 and stop the flow of gas in the gas flow path 2.3.

On the other hand, as described above, if gas is not flowing through the gas meter 1 or the gas channels 2 and 3 even though the seismic sensor 5 is transmitting a sensing signal due to the occurrence of an earthquake, the flow rate signal from the flow rate signal transmitter 12 is not generated and no flow rate signal is input to the microcomputer 13, so no cutoff signal is generated.

Further, when a sensing signal is transmitted from the seismic sensor 5, the timer 15 is started. Then, for example, within 2 minutes (within the time set by the timer 15) from the time when the sensing signal is input.
If a flow rate signal is generated, it is determined that there is a gas leak due to an earthquake, and the shutoff valve 16 is thereafter closed in the same manner as described above to stop the flow of gas through the gas channels 2 and 3.

Further, in order to return the cutoff valve 16, the return safety device 17 is activated.

Figure 2 is a flowchart showing the operation of Figure 1.
1) to (6) indicate each step.

First, when an earthquake occurs, the vibration causes the seismic sensor 5 to operate and send out a sensing signal (1). At the same time, the timer 15 starts (2), and then, if gas is being used, gas is flowing through the gas channels 2 and 3, so the flow signal transmitter 12 is activated and a flow signal is input. (
3), a shut-off signal is immediately sent (4), and the shut-off valve 1
day is activated and the gas flow is stopped (5).

On the other hand, even if an earthquake occurs and a sensing signal is generated (4), if gas is not used, no flow signal is input.
Timer 15 is operating. For example, within 2 minutes (6)
, When a gas leak occurs due to an earthquake or the like, a flow rate signal is generated, and a cutoff signal is sent (4). Thereafter, the cutoff valve 16 is operated in the same way as above, and the gas flow is stopped (
5).

In addition, in the above embodiment, the time point at which the sensing signal is generated,
Although the shutoff valve 16 is shut off if there is a flow rate signal in either case within a predetermined period of time, this may be done in only one of them. Further, although the microcomputer 13 is used as a cutoff signal transmitter, other means may be used.

(Effects of the Invention) As explained above, the present invention provides a seismic sensor that senses earthquake vibrations and transmits a sensing signal, and a flow signal generator that senses the flow of gas in a gas flow path and transmits a flow signal. vessel and ISR
The system is equipped with a shutoff signal transmitter that transmits a signal to shut off the shutoff valve when a sensing signal is transmitted from the device or when a flow signal is transmitted from the flow signal transmitter within a predetermined time from this point. Because the gas flow path is shut off only when gas is being used in the event of an earthquake, or when a gas leak occurs, there are fewer cases where the shutoff is restored after being shut off, and the gas flow path is It is easy to check for safety such as gas leakage, and there are advantages such as saving manpower required to check for gas leakage.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of FIG. 1, and FIG. 3 is a block diagram showing a conventional anti-seismic automatic gas shutoff device. In the figure, 1 is a gas meter, 2.3 is a gas flow path, 5 is a seismic sensor, 11 is an anti-vibration automatic gas cutoff device, 12 is a flow rate signal transmitter, 13 is a microcomputer, 15 is a timer, and 16 is a cutoff valve. It is. Figure 1 Figure 3

Claims (1)

[Claims] In a gas flow path equipped with a shutoff valve, a seismic sensor that senses earthquake vibration and transmits a sensing signal; a flow signal transmitter that senses the flow of gas in the gas flow path and transmits a flow signal;
A shutoff signal transmitter that transmits a signal to shut off the shutoff valve at the time when the sensing signal is transmitted from the seismic sensor or when the flow rate signal is transmitted from the flow rate signal transmitter within a predetermined time from this point. Anti-earthquake automatic gas shutoff device.