JPH0332837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a so-called intercom device with a gas leak alarm function.

BACKGROUND OF THE INVENTION In general, intercom devices with a gas leak alarm function often have a function to notify when a gas detector is disconnected, in addition to the intercom and gas leak alarm functions. Therefore, if the gas detector is used as is without being connected, it may operate in the same way as if the gas detector had been disconnected, and the disconnection alarm may continue to sound. Therefore, when configuring this type of intercom device, this disconnection detection circuit is connected to the input side of the disconnection detection circuit that detects the disconnection of the gas detector.Even if the gas detector is not connected, the disconnection detection circuit detects the disconnection of the gas detector by mistake. The structure is such that circuit elements such as resistors can be arbitrarily connected as needed to prevent the device from operating in the same way as the device.

Problems to be Solved by the Invention However, the above-mentioned conventional intercom device has the following problems.

(1) Even if a circuit element such as a resistor is connected to the input side of the disconnection detection circuit, there is nothing to indicate this. Therefore, once the circuit element such as the resistor is installed, it cannot be removed. However, even if a gas detector is installed, it may not work, creating the illusion that the intercom system itself is malfunctioning.

(2) An indicator light for power supply display and an indicator light for alarm display are provided separately, and therefore a large amount of space is required as a whole, which is not very desirable in terms of cost.

The present invention solves the above problems,
It is an object of the present invention to provide an excellent intercom device that can clearly display when a circuit element such as a resistor is connected to a disconnection detection circuit with a simple configuration.

Means for Solving the Problems In order to achieve the above objects, the present invention provides an alarm detection circuit that detects when a gas detector issues an alarm, and a disconnection that detects when the gas detector is disconnected. A detection circuit, a circuit element capable of lowering the voltage such as a resistor connected to the disconnection detection circuit so that the disconnection detection circuit does not determine a disconnection even when the gas detector is not connected, and this circuit element. Indicator light control that inputs information that the above-mentioned detection circuit has been connected, that the above-mentioned detection circuit has issued an alarm, or has detected a disconnection, and lights up the common indicator light in different patterns such as turning on, blinking, and turning off depending on the input. A circuit, an alarm oscillation circuit that inputs the above information, issues an alarm according to the input, and generates an alarm sound when a disconnection is detected, and a separate alarm oscillation circuit that inputs the above information, issues an alarm according to the input, and generates an alarm when a disconnection is detected. and a switching circuit that controls a switching switch and switches the output side of the alarm oscillation circuit to be connected to a speaker connected to a call circuit.

Effects With the above-described configuration, the indicator light not only monitors the power supply together with the alarm sound, but also monitors the gas detector alarm and wire breakage, and also monitors whether the gas detector is connected and in the correct monitoring state. It has the function of monitoring whether or not it is present.

Embodiment The figure is a schematic configuration diagram of an embodiment of the present invention. In the figure, 1 is the intercom device main body, 2 is the doorphone handset, 3 is the gas detector, and 4 is the one to connect when the gas detector 3 is not connected. Resistor for monitoring status setting, 5
is a disconnection detection circuit that detects when gas detector 3 is disconnected; 6 is an alarm detection circuit that detects when gas detector 3 is activated; and 7 is when emergency push button switch 8 is turned on. 9 is an alarm transmission circuit that generates an alarm sound; 10 is an indicator light control circuit; 11 is an indicator light; 1
2 is an alarm lamp output circuit for outputting an alarm signal to the doorphone handset 2; 13 is an alarm sound output location switching circuit for switching the changeover switch 7; 14 is an alarm sound amplification circuit; 15 is an induction transformer; and 16 is an intercom switch. Microphone, 17 is a calling circuit, 18 is a speaker, 19 is an induction transformer, 20 is a microphone on the side of the door phone handset 2,
21 is a matching transformer, 22 is a speech amplification circuit, 23 is a speaker, 24 is a call switch, 2
Reference numerals 5 and 26 are an alarm indicator light and an indicator light provided in the intercom handset 2, respectively.

Next, the operation of the above embodiment will be explained.

Normally, the changeover switch 27 is connected to the induction transformer 19 side, and the microphone 16 of the intercom device main body 1 and the calling circuit 1
7, speaker 18, induction transformer 19
and the microphone 20 of the door intercom handset 2, the matching transformer 21, the call amplification circuit 22, and the speaker 2
3. Using the call switch 24, a call can be made between the door intercom handset 2 and the intercom device main body 1, which is its base unit.

Here, a normal connection state for gas leak detection, that is, a state in which the gas detector 3 is connected and the monitoring state setting resistor 4 is removed, will be described. At this time, the disconnection detection circuit 5 and the alarm detection circuit 6
enters the monitoring state, and the indicator light 11 lights up due to the function of the indicator light control circuit 10, indicating that it is in the monitoring state. In this state, the indicator light 26 of the door intercom handset 2 also lights up at the same time.

When the gas detector 3 issues an alarm in the above-mentioned normal connection state, this is detected by the alarm detection circuit 6, and the alarm output location switching circuit 13 switches the changeover switch 27 to the induction transformer 15 side. The alarm oscillation circuit 9 oscillates, and its output is sent to the speaker 18 through the alarm amplification circuit 14.
A gas alarm sound is emitted. Furthermore, a gas alarm sound is emitted from the speaker 23 of the door intercom handset 2 via the matching transformer 21. At this time, the indicator light 11 is controlled by the indicator light control circuit 10.
blinks and lights up, and the indicator light 26 of the intercom slave unit 2 also blinks and lights up at the same time. Furthermore, alarm lamp output circuit 1
2, the alarm indicator light 25 also starts blinking.

Next, when the gas detector 3 is disconnected during the above-mentioned monitoring state, that is, when the wire becomes disconnected, the voltage at the connection part of the gas detector changes, and as a result, the disconnection is detected by the disconnection detection circuit 5, and the alarm sound is output. The changeover circuit 13 switches the changeover switch 27 to the induction transformer 15 side, and
The alarm oscillation circuit 9 oscillates, and its output is passed through the alarm amplification circuit 14 and a gas alarm sound is emitted from the speaker 18. Furthermore, a gas alarm sound is emitted from the speaker 23 of the door intercom handset 2 via the matching transformer 21. At this time, the indicator light 11 is turned off by the action of the indicator light control circuit 10, and at the same time, the indicator light 26 of the intercom handset 2 is also turned off.

Also, if you operate the emergency push button switch 8,
This is detected by the emergency detection circuit 7, and based on its output, the alarm sound output location switching circuit 13 switches the changeover switch 27 to the induction transformer 15 side, and the alarm oscillation circuit 9 oscillates. Therefore, when this is amplified by the alarm amplification circuit 14 and applied to the speaker 18, it is simultaneously applied to the speaker 23 of the intercom slave unit 2, thereby issuing an emergency alarm sound.

The above is an explanation of the operation in the normal connection state for gas detection, that is, the state in which the gas detector 3 is connected and the monitoring state setting resistor 4 is removed. To explain the steps, if the monitoring state setting resistor 4 is not connected as in the conventional intercom device, the voltage applied to the disconnection detection circuit 5 will be different from the monitoring state in the normal connection state, so it will be the same as in the disconnection state. Send the alarm sound to speaker 18 and doorbell handset 2
is emitted from the speaker 23 of. However, when the monitoring state setting resistor 4 is connected, as is clear from the figure, a constant voltage is applied to the disconnection detection circuit 5 and the alarm detection circuit 6 via the monitoring state setting resistor 4, so that the monitoring state is established. Even if the detector 3 is not connected, the disconnection detection circuit 5 will not detect this as a disconnection, and in this case, the indicator light control circuit 10 will turn off the indicator light 11, and at the same time the indicator light of the intercom handset 2 will be turned off. 26 is also turned off, but no alarm sound is output.

In addition, if the monitoring state setting resistor 4 is not connected and the gas detector 3 is not connected, the same voltage as in the disconnection state is applied to the disconnection detection circuit 5, and the same determination as in the disconnection state is made. , the indicator lights 11 and 26 go out, and the speakers 18 and 23 emit an alarm sound.

Furthermore, if the gas detector 3 is connected while the monitoring state setting resistor 4 is connected in advance, if the gas detector 3 and the monitoring state setting resistor 4 are not connected, and when the monitoring state setting The indicator lights 11 and 26 are turned off in the same way as when only the resistor 4 is connected. Also, it was clear at the time of construction that gas detector 3 was connected, so
It can be seen that the monitoring state setting resistor 4 is already connected.

As described above, according to the above embodiment, the indicator light 11 provided on the intercom device main body 1 not only monitors the power supply together with the alarm sound, but also monitors the alarm and disconnection of the gas detector, and also monitors the gas detector 3. It has a function to monitor whether the gas detector 3 is connected and is in the correct monitoring state, and prevents the situation where the gas detector 3 is accidentally connected without removing the monitoring state setting resistor 4 during construction. be able to.

Effects of the Invention As is clear from the above embodiments, the present invention is capable of displaying and monitoring the connection status of circuit elements such as resistors for preventing malfunction of gas detectors and disconnection detection circuits by means of indicator lights. This structure prevents construction problems before they occur, and one indicator light on the intercom device itself serves both as an indicator light to indicate energization and an indicator light to indicate gas alarm. Therefore, the structure as a whole is simplified and costs can be reduced.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of an embodiment of the intercom device of the present invention. 1... Intercom device body (base unit), 2...
Door phone handset, 3...Gas detector, 4...Resistor for monitoring status setting, 5...Disconnection detection circuit, 6...Alarm detection circuit, 7...Emergency detection circuit, 8...Emergency push button switch , 9... Alarm transmission circuit, 10...
Indicator light control circuit, 11... Indicator light, 12... Alarm lamp output circuit, 13... Alarm sound output point switching circuit, 14... Alarm sound amplification circuit, 15... Induction transformer, 16... Microphone, 17 …
... Call circuit, 18 ... Speaker, 19 ... Induction transformer, 20 ... Microphone,
21...Matching transformer, 22...Telephone amplification circuit, 23...Speaker, 24...Call switch, 25...Alarm indicator light, 26...Indicator light, 27
...Toggle switch.

Claims (1)

[Claims] 1. An alarm detection circuit that detects when a gas detector is activated; a disconnection detection circuit that detects when a gas detector is disconnected; and a disconnection detection circuit that detects disconnection even when the gas detector is not connected. a circuit element capable of lowering the voltage such as a resistor connected to the disconnection detection circuit so as not to determine that the disconnection is a disconnection;
The information that this circuit element is connected and the information that the detection circuit has detected an alarm or disconnection are input, and the common indicator lights are turned on in different patterns such as turning on, blinking, and turning off depending on the input. An indicator light control circuit, an alarm oscillation circuit that inputs the above information, issues an alarm in response to that input, and generates an alarm sound when a disconnection is detected; An intercom device comprising a switching circuit that controls a separately provided switching switch and switches the output side of the alarm oscillation circuit to be connected to a speaker connected to a call circuit.