JPH063518Y2 - Gas alarm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a gas alarm device which detects a gas leak and outputs a signal for issuing an alarm to the outside.

[Prior Art] As an example of a conventional gas alarm of this type, there is one having a configuration as shown in FIG. In the figure, the gas alarm 1
Includes a gas alarm main circuit 2 and a voltage output circuit 3, which are installed in each room equipped with a gas supply device, that is, a gas stopper. When the gas sensor detects a gas leak, the gas alarm main circuit 2 has an alarm means (not shown) that drives a light emitting diode, a buzzer or the like to notify the gas leak to the outside. Further, the gas alarm device main circuit 2 outputs an external signal i ₁ to the voltage output circuit 3 in the gas alarm state at the time of gas leak.
(Control signal) is output. The voltage output circuit 3 outputs three different voltages according to the external signal i ₁ from the gas alarm main circuit 2.

That is, when the gas alarm main circuit 2 is not outputting the external signal i ₁ , the gas alarm main circuit 2 is in a standby state because it is in a normal state in which no gas leakage occurs.
A predetermined voltage (for example, 6V) is output during this standby. Moreover, gas leakage occurs and the gas detector main circuit 2 accordingly outputs the external signal i ₁ with generating an alarm as described above, chromatic voltage output circuit 3 which receives the external signal i ₁ is Different voltage (for example, 12V) from the above standby time
Is output. Further, when the power plug is pulled out from the outlet due to self-damage and the power is no longer supplied, no voltage (0 V) is output. The output voltage of the voltage output circuit 3 is provided with a signal based on the voltage, for example, in a monitoring device provided in a manager's room in the case of an apartment house or in a gas distribution place of a propane gas supplier in the case of a detached house. It is also used to report the status of normality, gas leakage, self-harm and failure to the central monitoring station.

The voltage output circuit 3 is composed of a known DC voltage conversion circuit that outputs different voltages according to an external signal (control signal).

[Problems to be Solved by the Invention] In the above-described conventional gas alarm device, voltage signals of 6, 12 and 0 V are output when a gas leak is not detected, when a gas leak is detected and when self-damage is detected. Therefore, it is extremely convenient to report each detection information.However, for example, when trying to operate the gas shutoff valve to shut off the gas flow path at the time of gas leak detection and self-damage behavior detection, The gas shut-off valve cannot be directly driven by the voltage signal.

Also, in the case of a monitoring device configured to judge only the presence or absence of gas leakage by the presence or absence of the output signal of the gas alarm device,
It is not possible to directly connect the gas alarm device that outputs the voltage signal described above.

Therefore, conventionally, it has been necessary to configure various gas alarm devices in accordance with a device that uses the output signal of the gas alarm device, and there is a problem that the number of types of products increases.

Therefore, an object of the present invention is to provide a gas alarm device capable of controlling various external devices such as a gas shutoff valve coupled to the periphery thereof by one type of gas alarm device.

[Means for Solving the Problems] A gas alarm device according to the present invention for solving the above problems detects a gas leak and issues an alarm, and outputs an external signal indicating that the gas leak is detected. Which includes a gas alarm main circuit, the first voltage is always 0 V when the power supply is cut off, and the external signal output by the gas alarm main circuit is input to the first voltage. Drive for driving a gas cutoff valve provided in a gas supply path based on a voltage output circuit that outputs a second voltage different from the above voltage and an input of the external signal output by the gas alarm main circuit. A signal is output, and a shutoff output circuit for closing the gas shutoff valve by the drive signal, and an input of the external signal output by the gas alarm main circuit,
A non-voltage output circuit for short-circuiting its output and a detecting means for detecting the disconnection of the power outlet are provided, and the shutoff valve output circuit closes the gas shutoff valve in response to the detection of the disconnection of the power outlet by the detecting means. It is characterized in that the drive signal is output and the output of the non-voltage output circuit is short-circuited.

[Operation] In the above configuration, the gas alarm device has a voltage output circuit for inputting the external signal in addition to the gas alarm device main circuit for detecting the gas leak and giving an alarm when the gas leak occurs and outputting the external signal. , A shutoff valve output circuit and a non-voltage output circuit.

Then, the voltage output circuit always outputs the first voltage, the 0V voltage when the power supply is stopped, and the second voltage different from the first voltage based on the input of the external signal. An external device capable of knowing the occurrence of gas leakage by the second voltage and the self-damaged behavior by inputting the 0V voltage can be connected to the output of the.

In addition, the shutoff valve output circuit outputs a drive signal for driving the gas shutoff valve provided in the gas supply path based on the input of the external signal and in response to the detection of the disconnection of the power outlet by the detection means, Since the gas shutoff valve is closed by the drive signal, a gas shutoff valve that shuts off the gas supply passage in response to the detection of gas leakage can also be connected to the output of this circuit.

Further, the non-voltage output circuit short-circuits its output based on the input of the external signal and the detection of the disconnection of the power outlet by the detection means. An external device capable of knowing the occurrence and the abnormality of the disconnection of the outlet can be further connected.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a gas alarm device according to the present invention. In FIG. 1, a gas alarm main circuit 2 generates an alarm by a light emitting diode or a buzzer when gas is detected, and three different alarms are generated. External signals i ₁ , i ₂ , i ₃
And outputs these external signals i ₁ , i ₂ , i ₃ to the voltage output circuit 3, the shutoff valve output circuit 4 and the non-voltage output circuit 5, respectively.

In the above configuration, in the normal state where there is no gas leakage or self-damage, as described above with reference to FIG.
Outputs a standby voltage (6 V) based on the external signal i ₁ from the gas alarm main circuit 2. On the other hand, the output of the non-voltage output circuit 5 is in an open state (infinite output impedance) based on the external signal i ₂ from the gas alarm main circuit 2. The output of the voltage output circuit 3 and the non-voltage output circuit 5 is connected to an external device (not shown), for example, a monitoring device, so that in the monitoring device, there is no gas leakage in the room in which each gas alarm device is installed and the gas alarm is normal. You can recognize that you are in a state.

On the other hand, when a gas leak occurs, external signals i ₁ , i ₂ , i ₃ output from the gas alarm main circuit 2 at this time are generated.
Based on the above, the output circuits 3 to 5 are in the following states. Of these, the voltage output circuit 3 receives the external signal i ₁ and outputs the voltage (12 V) at the time of gas leak detection to its output,
The cutoff valve output circuit 4 receives the external signal i ₂ and outputs a drive signal for driving the gas cutoff valve, and the gas cutoff valve is closed by the drive signal. Further, the non-voltage output circuit 5 receives the external signal i ₃ and short-circuits its output (output impedance is zero), thereby notifying an external device, for example, a monitoring device, that gas leakage has occurred.

As described above, at the time of a gas leak, the gas cutoff valve of the gas flow path that supplies gas to the room where the gas is leaking is closed, and the output of the voltage output circuit 3 becomes abnormal voltage (12
V) or the output of the non-voltage output circuit 5 is short-circuited, the outside is notified that a gas leak has occurred in the room.

Furthermore, when the power supply is cut off due to self-harm,
The shutoff valve output circuit 4 outputs a drive signal for driving the gas shutoff valve based on the external signal i ₂ from the gas alarm device at this time, and the non-voltage output circuit 5 outputs the external signal i from the gas alarm device at this time. based on ₃ shorting its output. Further, the voltage output circuit 3 outputs the voltage (0 V) at the time of self-damage by shutting off the power supply. As a result, the monitoring device, which is an external device, can recognize that it is in the self-damaged state.

FIG. 2 shows a specific configuration of the gas alarm device according to the present invention,
In the figure, the gas alarm main circuit 2 is shown as a gas sensor 10, A
C amplifier 11, AC / DC converter 12, comparator 1
3, drive circuit 14, alarm buzzer 15 and alarm indicator 16
The external signal i ₁ is output from the output of the comparator 13 to the voltage output circuit ₃ through the diode D ₃ , the external signal i ₂ is output to the shutoff valve output circuit 4 through the delay circuit 17, and the diodes D ₁ and D ₂ , transistor Q ₁
The external signal i ₃ is output to the non-voltage output circuit 5 through.

In the voltage output circuit 3, the external signal i ₁ is supplied to the base of the transistor Q ₂ through the diode D ₄ . The collector of the transistor Q ₂ is connected to the base of the transistor Q _3, the collector of the transistor Q ₃ are connected to the common connection point of two series-connected Zener diodes ZD _1, ZD _2. Transistor Q is connected between the power supply and output.
₄ are connected in series, and the Zener diode Z is connected to the base.
The cathode of D ₁ is connected.

The cutoff valve output circuit 4 has a capacitor C ₁ connected between the power supply and ground, a transistor Q ₆ connected in series between the cutoff valve output and the power supply, and a transistor Q ₅ connected to the base side thereof. In addition, the delay circuit 17 is connected to the base of the transistor Q _5.
External signal i ₂ is input, and a diode D ₅ is connected to the collector output of the transistor Q ₆ .

Further, the non-voltage output circuit 5 has a transistor Q ₇ whose base receives an external signal i ₃ , a capacitor C ₂ and a resistor R ₂ are connected in parallel to the collector of the transistor Q ₇ , and the other end of the capacitor C ₂ is connected. The gate of PUTD ₆ is connected,
The anode of PUTD ₆ is connected to the other end of the resistor R ₂ . Further, the cathode of the PUTD ₆ is connected to the base of the transistor Q ₈ and the collector thereof is connected to the photocoupler PC, and a non-voltage output is obtained from the output of the PC.

In addition, in order to detect self-harm, the plug P of the power supply circuit 6
Is provided with a detector 7 for detecting that the outlet has been pulled out, and when power is no longer supplied to each device from the power supply circuit 6 in the event of self-damage or a power failure, power is supplied from the backup power supply 8. ing. The output of the detector 7 is connected to the bases of the transistors Q ₅ and Q ₁ .

In the above configuration, the gas sensor 10 constantly detects the gas in the atmosphere, and the detection signal is AC-amplified by the AC amplifier 11 and converted into a DC signal by the AC / DC converter 12. This DC signal is compared with the reference value by the comparator 13, and the gas leakage is determined based on the comparison result. That is, since the detection signal from the gas sensor 10 is small during standby (normal), the comparator 13
Output becomes L level, the drive circuit 14 outputs the buzzer 15,
The display 16 is not driven.

At this time, since the diode D ₃ is on, the transistor Q ₂ is off, and thus the transistor Q ₃ is on. Therefore, the Zener diode ZD ₂ is shut off, the base voltage set by the Zener diode ZD ₁ is applied to the transistor Q ₄ , and the voltage output circuit 3 outputs 6 V as its output.

Further, since the diode D ₁ is on, the transistor Q ₁ is off, and the transistor Q ₇ is also off, so that the PUTD ₆ is turned off. Thus, the transistor Q ₈ is turned off, since the phototransistor of the photocoupler PC is turned off, the output of the non-voltage output circuit 5 is open.

Further, since the external signal i ₂ is not output through the delay circuit 17, the transistor Q 5 is off and the transistor Q ₆ is also off, so that no voltage is generated at the output of the cutoff output circuit 4. At this time, the capacitor C ₁ is in a charged state by the resistor R ₁ .

On the other hand, when a gas leak occurs, the detection signal of the gas sensor 10 increases correspondingly, and the output of the comparator 13 is inverted to the H level, the drive circuit 14 drives the buzzer 15 and the display 16. Further, the gas alarm main circuit 2 outputs external signals i _{1 to} i ₃ . As a result, the diode D ₃ connected to the voltage output circuit 3 is turned off, the transistor Q ₂ is turned on, and the transistor Q ₃ is turned off. Therefore, the two zener diodes ZD ₁ and ZD _{2 are connected.}
Is applied to the base of the transistor Q ₄ , and the output of the voltage output circuit 3 becomes 12V.

Similarly, since the diode D ₁ is turned off, the transistor Q ₁ is turned on and the transistor Q ₇ of the non-voltage output circuit 5 is also turned on. This resistance R _2, a current flows through the delay circuit by the capacitor C _2, the charge of the capacitor C ₂ becomes equal to or higher than a predetermined value, allowed on the transistor Q ₈ putd ₆ is turned on, the light-emitting diode side of the photo coupler PC A current is passed, this is emitted to turn on the phototransistor side, and a non-voltage output is output as a short-circuited state (zero output impedance).

Further, in the shutoff valve output circuit 4, when a gas alarm or self-damage occurs, the H level output of the comparator 13 is delayed by the delay circuit 17 for a predetermined time, and the external signal i ₂ is input from the gas alarm main circuit 2. , Which is input to the base of the transistor Q ₅ . This transistor Q ₅ is turned on, turns on the transistor Q ₆ by flowing a base current to the transistor Q _6. Therefore, the electric charge of the capacitor C ₁ is discharged through the transistor Q ₆ and the diode D ₅ , and this discharge current becomes the cutoff valve output.

When the plug of the gas alarm 1 is pulled out due to self-damage, the detector 7 detects this state and outputs the same external signal i ₂ from the delay circuit 17, which is used as the base of the transistor Q ₅ . Supply to. At the same time, the backup power supply 8 supplies the backup power to the gas alarm main circuit 2, the shutoff valve output circuit 4, and the non-voltage output circuit 5. The shut-off valve output circuit 4 is activated by an external signal i ₂ from the detector 7, and shuts off the gas shut-off valve in the gas flow path that supplies gas to the room in which the self-damage has occurred. On the other hand, since no power is supplied to the voltage output circuit 3, its output is 0V.
Therefore, the monitoring device recognizes that self-damage has occurred due to this 0V voltage.

If the detection signal of the detector 7 is supplied as the external signal i ₃ of the non-voltage output circuit 5, it is possible to recognize that the output is short-circuited and abnormal when the self-damaged act.

[Effect] As described above, according to the present invention, the gas alarm device includes the voltage alarm output circuit, the shutoff valve output circuit and the non-voltage output circuit in addition to the gas alarm device main circuit, and the voltage alarm output circuit is generated. In addition to the occurrence of gas leakage due to the second voltage, an external device that can know the self-damage behavior by inputting 0V voltage, a gas cutoff valve that shuts off the gas supply path in response to detection of gas leak, and turning on the input Since it is possible to selectively connect an external device that can detect the occurrence of a gas leak and the abnormality of the outlet disconnection, it is only necessary to prepare one type of gas alarm device and to use various external devices. The present invention can be applied to, and since it is not necessary to increase the types of products, it is possible to obtain effects such as being extremely advantageous in product management.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment according to the present invention, FIG. 2 is a diagram showing an embodiment of the concrete configuration of FIG. 1, and FIG. 3 is a diagram showing a conventional configuration. 1 ... Gas alarm device, 2 ... Gas alarm device main circuit, 3 ... Voltage output circuit, 4 ... Shutoff valve output circuit, 5 ... Non-voltage output circuit, 7
... Detection means (detector).

Claims (1)

[Scope of utility model registration request] 1. A gas alarm device including a gas alarm main circuit for detecting a gas leak and generating an alarm and outputting an external signal indicating that the gas leak has been detected. A voltage output circuit that outputs a 0 V voltage when the supply is stopped, and a second voltage different from the first voltage based on the input of the external signal output from the gas alarm main circuit; A shutoff valve that outputs a drive signal for driving a gas shutoff valve provided in a gas supply path based on the input of the external signal output from the gas alarm device main circuit, and closes the gas shutoff valve by the drive signal. An output circuit, a non-voltage output circuit that short-circuits the output based on the input of the external signal output from the main circuit of the gas alarm device in the previous period, and a detection unit that detects disconnection of a power outlet, That in response to the detection of the power outlet omission, gas detector that the no-voltage output circuit is characterized by short-circuiting its output together with the shut-off valve output circuit outputs a driving signal to close the gas shut-off valve.