JPS6347712Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a centralized monitoring and control device for gas appliances that extinguishes the gas appliance in the event of an abnormality in the centralized monitoring and control device for gas appliances.

Conventional centralized monitoring and control equipment for gas appliances includes a central control unit, multiple terminal control units connected to the central control unit via transmission lines, and gas appliances each connected to each terminal control unit. There is a known system in which the gas appliances are controlled by command signals from the gas appliances and the operating status of the gas appliances is monitored by a central control unit. However, if there is a problem with the central control device, a transmission line problem due to disconnection or poor contact, or a problem with each terminal control device, the central control device will be unable to control the gas appliances, and gas leaks may occur. There is a disadvantage that gas appliances cannot be automatically extinguished even if a dangerous situation such as that occurs.

The purpose of the present invention is to provide a device that eliminates the above-mentioned disadvantages.
, a plurality of terminal control devices 3 , 3 . . . connected thereto via transmission lines 2 , and gas equipment 4 connected to each terminal control device 3. In a centralized monitoring and control device for gas appliances, which controls the appliances 4 and monitors the operating status of the gas appliances 4 using the central control device 1, each terminal control device 3 includes a control device that responds to command signals from the central control device 1. a determination circuit 5 that generates a fire extinguishing signal and an abnormal signal when the central control device 1, transmission line 2, and each terminal control device 3 themselves are abnormal; It is characterized in that it is provided with a detection circuit 6 and a point extinguishing control circuit 7 which performs point extinguishing of the gas appliance 4 based on the point extinguishing signal from the determination circuit 5 and the point extinguishing signal from the abnormality detection circuit 6. The central control device 1 sends the number of the designated terminal control device and a command signal for the gas appliance to each terminal control device 3, and also receives information from each terminal control device about the operating status of the gas appliance and whether the gas leak alarm 8 is activated or not. Receives information signals such as status.

In the figure, 9 indicates a connector that connects the transmission line 2, and 12 receives and amplifies the command signal sent from the central control unit 1 via the transmission line 2, and also receives and amplifies the command signal sent from the central control unit 1 via the transmission line 2. A transmitting/receiving signal amplifier is shown that amplifies information signals such as the operating status of the gas equipment 4 from the code converter 11 and transmits the amplified information signals to the central controller 1. Transmission/reception switching of the amplifier 12 is performed by an output from a transmission/reception switching circuit 14, which will be described later.

The determination circuit 5 outputs a match signal when the number of the designated terminal control device from the central control device 1 matches the number of the received terminal control device, and also functions as a decoder during reception, and acts as an encoder during transmission. Among the command signals in the code converter 11 from the central control device 1, the on/off signal for the gas equipment 4 and the abnormality signal for the central control device 1, transmission line 2, and each terminal control device 3 and a shift register 13 which outputs the signals in parallel from output terminals corresponding to the respective signals, and AND circuits 12a, 12b, 12c which output the signals from the shift register 13 when a matching signal is output from the code converter 11. It consists of

Here, AND circuit 12a is for ignition, AND circuit 1
2b is for fire extinguishing, and AND circuit 12c is for abnormality detection.

In the figure, reference numeral 14 indicates a transmission/reception switching circuit, which receives a coincidence signal from the code converter 11 and generates an output for a certain period of time, during which the transmission/reception signal amplifier 12 and the code converter 11 transmit/receive. This is for switching to different uses.

Further, 15 indicates a reset pulse generation circuit,
The generation circuit 15 generates a clear pulse for clearing the command signal from the central control device 1 in the code converter 11 and an information signal from the terminal control device 3 for sending the information signal from the terminal control device 3 to the central control device 1 based on the output of the transmission/reception switching circuit 14. This is used to generate a start pulse for the code converter 11.

The abnormality detection circuit 6 includes two comparators 16 and 1.
7, a capacitor 18 connected to the positive input terminal of one comparator 17, and the capacitor 1
It mainly consists of a series connection circuit of a switching transistor 19 and a resistor 20, which are connected in parallel to 8, and when the centralized monitoring control is normal, an output is intermittently generated from the AND circuit 12c in the judgment circuit 5, and the transistor 19 is turned on at regular time intervals, and the capacitor 18 is connected to the resistor 21 in series with the resistor 2.
0, the charging voltage is regulated to be below a certain value, and no output is output from the two comparators 16 and 17.

In addition, when an abnormality occurs, no output is generated from the AND circuit 12c, the transistor 19 is turned off, the capacitor 18 is charged to a certain value or more, and a fire extinguishing signal is obtained from the two comparators 16 and 17. did.

The ignition/extinguishing control circuit 7 is composed of a magnetic latch relay, and is kept energized by the output of the AND circuit 12a for ignition in the judgment circuit 5, and is deenergized by the output of the AND circuit 12b for extinguishing or the output of the abnormality detection circuit 6. I made it so that it would be done.

The contact 7a of this magnetic latch relay is connected to the gas appliance 4.
The magnetic latch relay is connected in series to an ignition circuit (not shown) within the gas appliance 4 and is closed to maintain ignition of the gas appliance 4 while the magnetic latch relay is maintained energized. The contact 7a is also provided on the output side of the code converter 11 outside the gas appliance 4, and is also used for checking the operating state of the gas appliance 4.

In the figure, reference numeral 22 indicates a constant voltage power supply, and reference numerals 23 and 24 indicate switches for manually energizing or de-energizing the magnetic latch relay.
It is possible to extinguish a fire at one point.

Next, the operation of the central monitoring and control device will be explained by dividing it into the operation in a normal state and the operation in an abnormal state.

(i) In case of normal state When the ignition command signal and the normal signal are given from the central control device 1 to the determination circuit 5 in the designated terminal control device 3, a match signal is output from the code converter 11,
An ignition signal is generated from the AND circuit 12a, and the magnetic latch relay constituting the ignition/extinguishing control circuit 7 is kept energized. As a result, the contact 7a of the magnetic latch relay is closed, the gas appliance 4 is ignited, and the ignition state is maintained. Furthermore, AND circuit 12c
A normal signal, that is, an intermittent output signal is generated from the abnormality detection circuit 6, and the charging voltage of the capacitor 18 in the abnormality detection circuit 6 is regulated below a certain value, and no extinguishing signal is generated.

Further, when a fire extinguishing command signal is given to the determination circuit 5, a fire extinguishing signal is generated from the AND circuit 12b.
The magnetic latch relay is de-energized and the gas appliance 4
is extinguished.

In the above case, the ignition state and extinguishing state of the gas appliance 4 are determined by the output of the transmitting/receiving converter 14 which is activated when a matching signal is generated from the code converter 11 for a certain period of time, and the code converter 11 and the transmitting/receiving signal amplifier 12 are activated for transmission. By switching, the signal is sent to the central control unit and monitored.

(ii) In the case of an abnormal state If there is a problem with the central control device 1 or a problem with the transmission line 2 due to disconnection, poor contact, etc., the command signal does not enter the judgment circuit 5, so the AND
No output is generated from the circuit 12c and the abnormality detection circuit 6
capacitor 18 is overcharged to a certain value or more,
When the extinguishing signal is output from the detection circuit 6, the magnetic latch relay constituting the ignition/extinguishing control circuit 7 is de-energized, and the gas appliance 4 is extinguished and safe.

As described above, according to the present invention, each terminal control device 3
During normal operation, it generates an extinguishing signal for gas equipment 4,
A determination circuit 5 that generates an abnormal signal when an abnormality occurs; an abnormality detection circuit 6 that generates an extinguishing signal based on the abnormal signal from the determination circuit 5; Since a point-extinguishing control circuit 7 is provided that turns on and extinguish the gas appliances 4 using a fire-extinguishing signal, if an abnormality occurs in the central control device 1, transmission line 2, or each terminal control device 3, the gas appliances 4 will automatically turn on and off immediately. The fire has been extinguished and is safe.

[Brief explanation of the drawing]

The drawing is a circuit diagram of the device of the present invention. 1... Central control device, 2... Transmission line, 3... Terminal control device, 4... Gas equipment, 5... Judgment circuit,
6...Abnormality detection circuit, 7...Initial extinguishing control circuit.

Claims (1)

[Scope of utility model registration request] Comprising a central control device 1, a plurality of terminal control devices 3, 3... connected to the central control device 1 via a transmission line 2, and gas equipment 4 connected to each terminal control device 3,
Gas appliances 4 are activated by command signals from central controller 1.
In a centralized monitoring and control device for gas appliances in which the operating status of gas appliances 4 is monitored by a central controller 1, each terminal controller 3 has a point corresponding to a command signal from the central controller 1. A determination circuit 5 that generates a fire extinguishing signal and an abnormal signal when the central control device 1, transmission line 2, and each terminal control device 3 themselves are abnormal; and an abnormality detection circuit that generates a fire extinguishing signal based on the abnormal signal from the determination circuit 5. 6, and a point extinguishing control circuit 7 that performs point extinguishing of the gas appliance 4 based on the point extinguishing signal from the determination circuit 5 and the extinguishing signal from the abnormality detection circuit 6. Control equipment safety equipment.