JP2000276672A - Alarm adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm adapter for shortening inspection time and reducing inspection cost. SOLUTION: When the abnormality of fuel gas is detected by a gas alarm, alarm signals which are voltage signals are inputted from the input discrimination circuit 4 of this alarm adapter 1. A delay circuit 5 measures the duration of the alarm signals, and when they continue for prescribed time or more, outputs signals for operating a photocoupler driving circuit 6 and interruption signals which are non-voltage signals for interrupting the supply of the fuel gas are outputted through a photocoupler output circuit 7 to a microcomputer meter. A switch 8 switchable so as to bypass the delay circuit 5 is provided, and at the time of confirming the operation of the alarm adapter 1 the interruption signals are immediately outputted, by switching the switch 8, from the photocoupler output circuit 7 to the microcomputer meter without waiting for the aforementioned duration at the time of the input of the alarm signals to the input discrimination circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm adapter provided between a gas alarm and a gas meter in a wired manner.

[0002]

2. Description of the Related Art A conventional alarm adapter will be described with reference to FIGS. FIG. 3 is a state diagram showing a connection state of the alarm adapter, which is between a ceiling-mounted or wall-mounted general-purpose or business-use gas alarm 2 and a general-home or business-use gas meter 3. The alarm adapter 1 is connected by wire. The gas alarm 2 outputs an alarm signal, which is a voltage signal described later, when an abnormality such as incomplete combustion of fuel gas or gas leakage is detected.
Output to The microcomputer meter 3 is inserted into the fuel gas supply path to measure the gas supply amount, and has a function of shutting off the fuel gas supply path when receiving a shut-off signal that is a non-voltage signal from the outside. I have. When the alarm adapter 1 receives an alarm signal indicating an abnormality of the fuel gas from the gas alarm 2, the alarm adapter 1 outputs a shutoff signal for shutting off the supply of the fuel gas to the microcomputer meter 3. Thus, when the gas alarm 2 detects an abnormality in the fuel gas, the supply of the fuel gas is shut off in response to the detection.

FIG. 4 is a block diagram showing the internal configuration of the alarm adapter 1. In the normal monitoring state, a voltage signal of 6 V is input to the alarm adapter 1 from the gas alarm 2,
When an abnormality of the fuel gas occurs, a voltage signal of 12 V or more corresponding to the content of the abnormality is input from the gas alarm 2 as an alarm signal. In the input determination circuit 4 of the alarm adapter 1,
An input signal from the gas alarm 2 is determined. If the input signal is a voltage signal of 12 V or more, the input determination circuit 4
The duration is measured by the delay circuit 5 connected to. For example, when the time continues for about 45 seconds to about 1 minute, a signal for operating the photocoupler drive circuit 6, that is, an alarm continuation signal is output from the delay circuit 5 to the photocoupler drive circuit 6. When the photocoupler drive circuit 6 operates, an optical signal is output to a photocoupler output circuit 7 constituting a photocoupler which is an output circuit together with the photocoupler drive circuit 6, and the photocoupler output circuit 7 operates, and the microcomputer meter 3 is operated. A shutoff signal for shutting off the supply of the fuel gas is output.

The above-mentioned delay time of about 45 seconds to 1 minute is provided to prevent chattering so that the supply of fuel gas is not interrupted due to instantaneous noise. As described above, the alarm adapter 1
An alarm signal, which is a voltage signal from the gas alarm device 2, is converted into a shut-off signal, which is a non-voltage signal for shutting off fuel gas supply, and is output to the microcomputer meter 3.

When this alarm adapter 1 is connected to the gas alarm 2 and the microcomputer meter 3 by wire, a disconnection or a connection failure between the gas alarm 2 and the alarm adapter 1 and between the alarm adapter 1 and the microcomputer meter 3 are caused. In order to find out whether there is any defect in each device at an early stage, an inspection should be conducted at the stage when connection work has been completed.

For this inspection, an openable and closable inspection switch 10 composed of a reed switch is provided between the input discrimination circuit 4 and the photocoupler drive circuit 6. One method of inspection will be described. First, in a state where a voltage signal of 6 V is output from the gas alarm 2 to the alarm adapter 1 in the monitoring state described above, the attached magnet (not shown) is brought close to the upper part of the outer main body of the alarm adapter 2.
The inspection switch 10 is closed. At this time, if the gas alarm device 2 is connected, a voltage signal of 6 V is input to the input discriminating circuit 4. Therefore, when the check switch 10 is closed, the alarm continuation signal is simulated to the photocoupler drive circuit 6. And consequently the photocoupler output circuit 7
Operates, and a shutoff signal is output to the microcomputer meter 3 in a pseudo manner. At this time, if the connection between the alarm adapter 1 and the microcomputer meter 3 is normal, the supply of the fuel gas is cut off. Thereby, gas alarm 2, alarm adapter 1,
The connection state between the microcomputer meters 3 can be confirmed.

On the other hand, a check gas such as CO is blown onto the gas alarm device 2 to create a pseudo abnormal condition, and a series of operations between the gas alarm device 2, the alarm adapter 1 and the microcomputer meter 3 are confirmed. There is a way. In this method, first, when a check gas is blown to the gas alarm device 2, an alarm signal which is a voltage signal of 12 V or more is input from the gas alarm device 2 to the input discriminating circuit 4 of the alarm device adapter 1, and the delay circuit 5 Measure the duration of the alarm signal. When the alarm signal inputted to the input discriminating circuit 4 continues for about 45 seconds to about 1 minute, the signal of the delay circuit 5 receives the signal, the photocoupler drive circuit 6 operates, and the microcomputer 3 receives the signal via the photocoupler output circuit 7. A shutoff signal is output, and the supply of fuel gas is shut off. As described above, the supply of the fuel gas is cut off after a delay time of about 45 seconds to about 1 minute after the inspection gas is blown to the gas alarm 2, so that the gas alarm 2, the alarm adapter 1, the microcomputer meter 3 It can be confirmed that the connection between the devices and the operation of each device are normal.

[0008]

When the gas alarm 2 and the alarm adapter 1 are newly installed at the same time or when the alarm adapter 1 is newly installed, the connection abnormality between the gas alarm 2, the alarm adapter 1, and the microcomputer meter 3 is abnormal. Inspection such as is necessary,
According to the inspection method by closing the inspection switch 10, the connection state between the gas alarm device 2, the alarm device adapter 1, and the microcomputer meter 3 can be inspected.
When the alarm detects an abnormality in the fuel gas, the alarm adapter 1
, An alarm signal is output, and as a result, it cannot be checked by the microcomputer meter 3 that the supply of fuel gas is cut off.
Further, in the inspection method based on a series of operation confirmations using the inspection gas, the connection between the gas alarm device 2, the alarm device adapter 1, and the microcomputer meter 3 and the operation of each device can be confirmed. Since the operation can be confirmed after the delay time of the alarm signal which has continued for a predetermined time, a long inspection time is required. Further, if the alarm signal is stopped within a predetermined duration, the duration is reset, so that it is necessary to blow the inspection gas in consideration of the duration, and the amount of the inspection gas to be blown increases, which increases cost. I will.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an alarm adapter which realizes a reduction in inspection time and a reduction in inspection cost.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 is to receive an alarm signal which is a voltage signal output from a gas alarm when an abnormality of fuel gas is detected. An alarm adapter for outputting a shut-off signal, which is a no-voltage signal, to a gas meter inserted into a fuel gas supply path to shut off the supply of fuel gas, wherein an alarm signal from the gas alarm continues for a predetermined time. A delay circuit that outputs an alarm continuation signal, an output circuit that receives the alarm continuation signal output from the delay circuit, and outputs the shutoff signal to the gas meter, and the delay circuit when an alarm signal is input from the gas alarm device. And a switch capable of switching so as to output a cut-off signal from the output circuit without the intervention of the output circuit.

For this reason, when the gas alarm detects an abnormality of the fuel gas, it checks whether or not the supply of the fuel gas is cut off, and when a warning signal is input from the gas alarm, a delay circuit is used. Inspection time can be reduced by switching the switch so that an output signal is output from the output circuit without the need for inspection, and the inspection gas is sprayed on the gas alarm to create a simulated abnormal state of the fuel gas for inspection. The amount of inspection gas used when performing the inspection can be reduced, and the cost for inspection can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the switch is a reed switch operated by bringing a magnet close to the switch. Therefore, even when the switch is provided in the case and cannot be directly operated, the switch can be operated from outside the case by bringing the magnet close to the outside of the case.

[0013]

Embodiments of the present invention will be described. The connection state of the alarm adapter 1, the gas alarm 2, and the microcomputer meter 3 is the same as the conventional example shown in FIG. The circuit configuration of the alarm adapter 1 is as shown in the block diagram of FIG. 1. The difference from the conventional example of FIG. 4 is that the delay circuit is provided between the input discrimination circuit 4, the delay circuit 5 and the photocoupler drive circuit 6. 5 is provided so as to be bypassed, and a switch 8 is newly provided which can be switched so that the signal of the input determination circuit 4 is directly input to the photocoupler drive circuit 6 through the input determination circuit 4 by an operation described later. . In FIG. 1, the inspection switch 10 connected between the input determination circuit 4 and the photocoupler drive circuit 6 shown in FIG. 4 is omitted. In FIG. 1, the same components as those in FIG. 4 are denoted by the same reference numerals.

FIG. 2 is a block diagram showing a part configuration of the alarm adapter 1. The alarm adapter 1 is provided with a circuit board 13 on which the circuit shown in FIG. 1 is mounted in a case 12 made of, for example, resin. The switchable switch 8 is mounted on the circuit board 13, and the switch 8 is a reed switch that is closed by applying the magnet 11 to the outside of the case 12 close to the switch 8.

The operation of the alarm adapter 1 configured as described above during inspection will be described. At the time of this inspection, first, the magnet 11 is brought close to the outside of the case 12 of the alarm adapter 1 to close the switch 8, which is a reed switch.
When a check gas is blown to the gas alarm 2 in this state, a voltage signal of 12 V or more is input to the input determination circuit 4 of the alarm adapter 1 as an alarm signal. When the switch 8 bypassing the delay circuit 5 is closed, the signal from the input discriminating circuit 4 is directly input to the photocoupler drive circuit 6, so that the inspection gas is blown to the input discriminating circuit 4.
When a voltage signal of V or more is input as an alarm signal, the photocoupler drive circuit 6 operates immediately without waiting for the predetermined duration time of the delay circuit 5 described in the conventional example. Then, a cutoff signal, which is a non-voltage signal for cutting off the supply of the fuel gas, is output to the microcomputer meter 3 via the photocoupler output circuit 7, and the supply of the fuel gas is cut off.

At this time, if the connection state between the gas alarm 2, the alarm adapter 1, and the microcomputer meter 3 and each device is normal without any trouble, the inspection gas is blown to the gas alarm 2 for about 1 second. The supply of the fuel gas is shut off by the meter 3. Therefore, even when the gas alarm 2 and the alarm adapter 1 are newly installed, only one inspection of spraying the inspection gas to the gas alarm 2 for about one second is performed, and the gas alarm 2, the alarm adapter 1, the microcomputer meter It is possible to confirm whether or not there is a connection abnormality between the three devices and whether or not each device has a defect. In the normal monitoring state, the switch 8 is opened to provide a delay time as described in the conventional example, thereby preventing chattering.

As described above, in the present embodiment, at the time of inspection for confirming the operation of the gas alarm 2, the alarm adapter 1, and the microcomputer meter 3, a delay time of about 45 seconds to 1 minute is eliminated as in the prior art, and the inspection time is reduced. Can be shortened, the amount of sprayed inspection gas can be reduced, and costs can be reduced.
In addition, since the switch 8 is a reed switch that operates by bringing the magnet 11 close to the switch, the switch 8 provided in the case 12 can be operated from outside the case 12.

[0018]

As described above, according to the first aspect of the present invention, when an alarm signal, which is a voltage signal output from a gas alarm device when an abnormality of the fuel gas is detected, is received, the fuel gas is supplied to the fuel gas supply path. An alarm adapter that outputs a shut-off signal, which is a no-voltage signal, to the inserted gas meter to shut off the supply of fuel gas, and outputs a warning continuation signal when an alarm signal from the gas alarm continues for a predetermined time. A circuit, an output circuit that receives the alarm continuation signal output from the delay circuit, and outputs the cutoff signal to the gas meter, and the output circuit that does not pass through the delay circuit when an alarm signal is input from the gas alarm device. A switch that can be switched to output a shutoff signal is provided, so that when the gas alarm detects an abnormality in the fuel gas, it is checked whether the supply of the fuel gas is shut off. When the alarm signal is input from the gas alarm device, the switch can be switched so that the cutoff signal is output from the output circuit without passing through the delay circuit, thereby shortening the inspection time and checking the gas alarm device. It is possible to reduce the amount of inspection gas used when performing an operation check by simulating an abnormal state of the fuel gas by spraying the gas, thereby reducing costs at the time of inspection.

According to a second aspect of the present invention, in the first aspect of the invention, since the switch is a reed switch that operates by bringing a magnet close to the switch, the switch is provided in a case and can be directly operated. Even when it is not possible, the switch can be operated from outside the case by bringing the magnet close to the outside of the case.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an alarm adapter according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a component configuration of an alarm adapter corresponding to the embodiment of the present invention.

FIG. 3 is a state diagram showing a connection state of a conventional alarm adapter.

FIG. 4 is a block diagram showing a configuration of a conventional alarm adapter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Alarm adapter 4 Input discrimination circuit 5 Delay circuit 6 Photocoupler drive circuit 7 Photocoupler output circuit 8 Switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Tomita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Yoshiyuki Matsubara 2-5-2-4 Mitsuyanaka, Yodogawa-ku, Osaka-shi No. New Cosmos Electric Co., Ltd. F-term (reference) 5C086 AA02 DA10 GA04

Claims (2)

[Claims] When an abnormality of a fuel gas is detected, an alarm signal which is a voltage signal output from a gas alarm device is received, and a shut-off signal which is a non-voltage signal is supplied to a gas meter inserted into a fuel gas supply path. An alarm adapter for outputting an alarm continuation signal when the alarm signal from the gas alarm continues for a predetermined time, and an alarm continuation output from the delay circuit. An output circuit that receives the signal and outputs the shut-off signal to the gas meter, and a switch that can be switched to output a shut-off signal from the output circuit without passing through the delay circuit when an alarm signal is input from the gas alarm device. And an alarm adapter. 2. The alarm adapter according to claim 1, wherein the switch is a reed switch operated by bringing a magnet close to the switch.