JPH029433Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a centralized monitoring device for gas leak alarms, and in particular, a repeater is provided for each area where multiple gas leak alarms are installed, and the gas leak alarms are integrated by the repeater. This invention relates to a centralized monitoring device for a gas leak alarm, which centrally monitors the output of a gas leak alarm. The inventors of the present invention have developed gas leak alarms 1a, 1b, ..., 1n arranged in each area as shown in FIG.
are connected to the signal line from the centralized monitoring board 3 provided in the center via the repeaters 2a, 2b, ..., 2n, respectively, and the repeaters 2a, 2n are connected from the centralized monitoring board 3 to the
2b,..., 2n sequentially, and if a repeater that receives this call, for example repeater 2a, is called, a signal corresponding to the output of gas leak alarm 1a connected to repeater 2a will be sent to the central monitoring board. We have proposed a device that centrally monitors each of the gas leak alarms 1a to 1n using a so-called polling method in which the gas leak alarms 1a to 1n are returned to the gas leak alarms 1a to 1n. Such a gas leak centralized monitoring device is, for example,
If a gas leak alarm is installed in each unit of a condominium or other apartment complex, gas leak monitoring can be performed for each unit. In cases where multiple gas leak alarms are installed in the same area because the monitoring area is relatively wide, such as in an underground mall, it is recommended to install a repeater for each gas leak alarm. Then, as the number of repeaters increases,
The circuit configuration of the central centralized monitoring panel also becomes complex and large as the number of gas leak alarms increases. Therefore, in apartment buildings, etc., one repeater is installed for each floor, and for each predetermined section in underground malls, multiple gas leak alarms are connected to this repeater, and each repeater is used to alert each gas leak alarm. It is conceivable to construct a device that collects the outputs of the devices and sends them back in response to a call from the center. However, the gas leak alarm used in the above device uses a commercial 100V AC as a power source, 6 volts for steady monitoring output when there is no gas leak, 12 volts for gas leak detection, and an artificial power source (100 VAC). A device is being considered that outputs three different types of voltage, including a trouble occurrence output of zero volts (detecting a risk of suicide) when the gas leak alarm is cut off. Even if the gas leak alarm is inputted to the gas leak alarm, only the highest voltage output can be obtained at all times, and there is a problem in that appropriate centralized monitoring of the gas leak alarm cannot be performed. The present invention was developed by focusing on these conventional problems, and is a gas leak alarm system that enables accurate centralized monitoring of gas leaks in each area where multiple gas leak alarm systems are installed. The purpose is to provide a centralized monitoring device. First, the present invention outputs a predetermined normal signal voltage in a normal monitoring state, outputs a gas leak signal voltage higher than the normal signal voltage in a gas leak detection state,
In addition, the outputs of multiple gas leak alarms whose output signal voltage becomes zero when the power is cut off are commonly connected to the signal line from the center so that the higher voltage is output with priority, allowing for centralized monitoring of gas leaks. Targets central monitoring equipment for alarms. In order to achieve the above-mentioned purpose in the present invention regarding such a centralized monitoring device for gas leak alarms, multiple gas leak alarms are connected to a circuit section that commonly connects multiple gas leak alarms to a signal line from the center side. Trouble determination means for determining that the output voltage of at least one of the alarms has become zero due to power cutoff; and a gas leak for determining that a gas leak signal voltage has been received from at least one of the plurality of gas leak alarms. a first switching means that operates when a discrimination output of the trouble discrimination means is obtained; and a second switching means that operates when a discrimination output of the gas leak discrimination means is obtained; 1st
The signal line is turned on when the second switching means is not operating, the signal line is turned off when only the first switching means is operating, and the signal line is turned on when the second switching means is operating. It is something. Hereinafter, the present invention will be explained based on the drawings. FIG. 2 is a block diagram showing one embodiment of the present invention. First, to explain the configuration, numeral 10 is a central monitoring board as a receiver installed in the center, which sequentially sends out a calling signal to each repeater, and receives a signal from the repeater sent back in response to this calling signal. Based on this, the monitoring status of each repeater, that is, steady status, gas leak, and trouble occurrence, are identified and displayed. The signal line 11 (consisting of a calling line, response line, power supply line, etc.) drawn out from the central monitoring board 10 has repeaters 12A, 12B, . . . installed in each area.
are connected, gate circuits 13A, 13B, ... are connected to each of the repeaters 12A, 12B, ..., and each gate circuit 13A, 13B, ... is connected to a plurality of gas leak alarms installed in each area. vessel 15a,
15b, . . . are commonly connected in parallel via adapter devices 14a, 14b, . Each of the gas leak alarms 15a, 15b, ... is powered by commercial AC 100V, with a constant monitoring output of 6 volts and a gas leak detection output of 12 volts.
Trouble occurrence output (when AC100V power is cut off) Generates each voltage output of zero volts. FIG. 3 is a circuit diagram showing an example of a specific circuit configuration of the gate circuit and adapter device in FIG. 2. First, to explain the adapter device 14a, the output of the gas leak alarm 15a is inputted by optical coupling, and the Zener diode ZD1 conducts at the gas leak detection output of the gas leak alarm 15a, and the Zener diode ZD1 emits light due to the conduction. It has a light emitting diode PD2 and a diode PD1 that emits light at a constant monitoring output of 6 volts. Therefore, when the trouble occurrence output is zero volts, neither of the light emitting diodes PD1 and PD2 emit light, resulting in a trouble determination state. Note that when the output is 12 volts, the light emitting diode PD1 also emits light. The phototransistor PQ1 is turned on by the light emitting output of the light emitting diode PD1 which receives the steady monitoring output of 6 volts, turns off the transistor Q1 , and puts the gate circuit 13 into a steady output operating state via the signal line 16. On the other hand, when the trouble occurs output is zero volts, the light emitting diode PD1 stops emitting light, the phototransistor PQ1 is turned off, and the transistor Q1 is turned on. Therefore, the adapter devices 14a, 14
The trouble determining means of the present invention is constructed by commonly connecting the outputs of the circuit portions consisting of the light emitting diode PD1, phototransistor PQ1, and transistor Q1 of the circuits b, . . . to the signal line 16. The series circuit consisting of the resistor R4, the Zener diode ZD2, the transistor Q2 , and the diode D2 constitutes a constant voltage circuit, and during steady monitoring when the phototransistor PQ2 is turned off, the transistor Q2 turns on and Zener diode ZD
2, for example 6.5 volts, is applied to the signal line 17 via the transistor Q3 and the diode D2, and is applied to the repeater 12 and the gate circuit 13. Here, the diode D2 is a bypass prevention diode that gives priority to the higher voltage, and is connected to the gas leak alarms 15a and 15 obtained through the photo coupler.
The outputs of b, . . . are sent to the gate circuit 13 via the diode D2. On the other hand, when the phototransistor PQ2 is turned on due to light emission from the light emitting diode PD2 due to the 12 volt output when detecting a gas leak, the transistor Q2 is turned off and the power supply voltage Vcc applied from the center side to the signal line 18 is turned on. , for example, 24 volts is applied to the signal line 17. The other adapter device 14b also has the same circuit configuration as the adapter device 14a. Next, the gate circuit 13 will be explained. The gate circuit 13 includes transistors Q3 and Q4 as first and second switching means that connect the signal line 20 and the common line 19 to the repeater 12 in parallel.
The transistor Q3 serving as the first switching means is always on unless the transistor Q1 of the adapter device 14a is turned on and pulling the signal line 16 to zero volts, while the transistor Q3 serving as the second switching means The transistor Q4 is base-biased so that it is turned on by the conduction of the Zener diode ZD3 when the voltage applied to the signal line 17 reaches approximately 24 volts as the transistor Q2 of the adapter device 14a turns off.
That is, the Zener diode ZD3 constitutes gas leakage determination means. The repeater 12 is provided with a light emitting diode PD3 connected between the signal lines 17 and 20 via a resistor R8, and the light emitting diode PD3 is connected between the signal lines 17 and 20.
Light is emitted with an intensity corresponding to the magnitude of the applied voltage between 0 and 0, and is sent back as a voltage signal in response to a call from the center by a transmitting circuit section of a repeater (not shown). Next, the operation will be explained with reference to the embodiment shown in FIG. First, the gas leak alarm 15a outputs the steady monitoring output 6.
When producing the bolt, the adapter device 14
The light emitting diode PD1 of a emits light, turning on the phototransistor PQ1 and turning off the transistor Q1 . Therefore, the signal line 16 is not pulled to zero volts, and the transistor Q3 of the gate circuit 13 receives the base bias from the resistors R5 and R6. I am turned on by receiving it. On the other hand, the adapter device 14a
Since the photodiode PD2 is not emitting light,
The phototransistor PQ2 remains off, so the transistor Q2 turns on, and a predetermined voltage (6.5V) determined by the Zener diode ZD2 is applied to the signal line 17 via the transistor Q3 and the diode D2. The voltage of 6.5 volts applied to the signal line 17 is also applied to the repeater 12, and the transistor Q3 of the gate circuit 13 is turned on.
A circuit is formed that connects to the common line 19 via the transistor Q3 of the gate circuit, and the light emitting diode PD3 of the repeater 12 emits light with an intensity corresponding to the applied voltage of 6.5 volts from the adapter device 14a. Next, if the gas leak alarm 15a produces a gas leak detection output of 12 volts, the adapter device 14
The light-emitting diodes PD1 and PD2 of a emit light, turning on the phototransistor PQ1, turning off the transistor Q1 , and turning on the phototransistor PQ1.
PQ2 turns on and turns off transistor Q2 .
Therefore, the transistor Q3 is turned on only by the base bias provided by the resistor R4, and the diode D
24 volts, which is approximately the power supply voltage, is applied to the signal line 17 via the signal line 2. This applied voltage of 24 volts is applied to the gate circuit 13 and the repeater 12 via the signal line 17, and in the gate circuit 13 the Zener diode ZD3 conducts to turn on the transistor Q4 , while the light emitting diode PD3 of the repeater 12 is the transistor Q3,
When Q4 is turned on, light is emitted with an intensity corresponding to the applied voltage of 24 volts. In addition, when the other gas leak alarms are producing a steady monitoring output of 6 volts, the gas leak alarm 15a
When the AC100V power supply is cut off, the light emitting diode PD1,
PD2 no longer emits light, and phototransistor PQ
1. PQ2 is also turned off, and phototransistor PQ
1 turns on the transistor Q1 , which pulls the base of the transistor Q3 of the gate circuit 13 to zero volts via the signal line 16. At this time, a constant voltage output of 6.5 volts corresponding to the steady monitoring output of 6 volts is applied to the signal line 17.
By turning off the transistor Q3 , the circuit connecting the signal line 20 to the common line 19 is cut off, the light emitting diode PD3 of the repeater 12 is prohibited from emitting light, and the occurrence of trouble is sent back to the center. In addition, in response to gas leak detection by other gas leak alarms, while the adapter device is applying 24 volts, which is approximately the power supply voltage, to the signal line 17, the gas leak alarm 15a outputs a trouble occurrence output of zero volts. If this occurs, the transistor Q3 of the gate circuit 13 is turned off by turning on the transistor Q1 of the adapter device 14a, but the applied voltage 24 of the signal line 17
The Zener diode ZD3 becomes conductive with the voltage of 24 volts, turning on the transistor Q4 and driving the light emitting diode PD3 of the repeater 12 to emit light in accordance with the applied voltage of 24 volts. That is, when gas leak detection and trouble occurrence detection occur at the same time, a voltage corresponding to the gas leak detection is applied to the repeater 12 with priority. FIG. 4 shows another embodiment of the present invention.
The central centralized monitoring board 10 is provided with a plurality of receiving sections 30A to 30N corresponding to each district, and signal lines 21A to 21N drawn out from each of the receiving sections 30A to 30N to each district, Gate circuits 22A to 22N operating as repeaters were connected, and a plurality of gas leak alarms 24a, 24b, . . . were connected in parallel to each of these gate circuits 22A to 22N via adapter devices 23a, 23b, . It is something. This embodiment corresponds to the embodiment of FIG. 2 in which the repeaters 12A, 12B, ... are provided in a central centralized monitoring board (receiver).
Gate circuit 2 that functions as a repeater for each district
2A to 22N are directly connected to the central monitoring board by signal lines 21A to 21N, so the central monitoring board 1
There is no need for a polling method that calls each repeater from 0, and the outputs of multiple gas leak alarms are compiled by gate circuits 22A to 22N as repeaters for each area, so the signal lines 21A to 21
The number of wires for N can be sufficiently reduced compared to the case where wires are wired for each gas leak alarm. FIG. 5 is a circuit diagram showing a specific example of the circuit configuration of the embodiment shown in FIG. 4 for one signal line system. First, to explain the configuration, the adapter device 23a,
23b,... have transistors Q10, Q12 , transistor Q10 is turned on by the steady monitoring output of 6 volts and gas leakage output of 12 volts of the gas leak alarm, and turns off transistor Q12, and when it receives the trouble occurrence output of 0 volts, the transistor Q10 is turned on. Q
10 turns off, turning on transistor Q12 . Therefore, the adapter devices 23a, 23
The trouble determining means of the present invention is configured by commonly connecting the outputs of the circuit section consisting of the transistors Q10, Q12 of transistors Q10, b, . . . to the gate circuit 22. The gate circuit 22 has substantially the same configuration as the gate circuit 13 shown in FIG . , the transistor Q13 serving as the first switching means is the transistor Q1 of the adapter device 23a, 23b,...
On the other hand, the transistor Q14 , which serves as the second switching means, outputs gas leak detection output from each gas leak alarm device 24a, 24b,...
It is turned on by the Zener diode ZD10, which becomes conductive when 12 volts are applied. Therefore, the Zener diode ZD10 constitutes gas leak determination means. The receiving section 30 includes a gate circuit 22, a signal line 21a,
21'a, and the signal lines 21a, 2
1'a gas leak alarms 24a, 24b,
It operates according to the output voltage of... That is, the receiving unit 30 has a gas leak detection output.
Transistor Q1 serves as a 12 volt reception determination section.
5. Zener diode ZD11 (Zener voltage is 6 volts or more and 12 volts or less), resistor R15,
A circuit consisting of R16 is provided, and the signal lines 21a, 2
The voltage applied between 1'a is the Zener diode ZD1
When the Zener voltage exceeds 1, for example 7 volts, the transistor Q15 turns on and outputs the voltage generated by the resistor R16 to the alarm display section as a gas leak reception signal _EG . In addition, transistors Q16, Q
17 and resistors R17 to R19 is provided, and when a trouble occurs and the output is zero volts, transistor Q16 is turned off and transistor Q1
7 is turned on, and the voltage generated across resistor R19 is output to the alarm display section as a trouble reception signal _ET . Note that a power supply voltage of 24 volts is applied between (+) and (-) of the receiving section 30 from the power supply section of the central monitoring board, but the gate circuit 22 and the adapter device 23a,
23b, . . ., one side (positive side) of the power supply of the gas leak alarm devices 24a, 24b, . . . is connected via the signal line 21a.
The voltage applied to each part may be considered using the potential of a as a reference potential. Further, the diode D10 is a loop prevention diode that gives priority to the higher voltage, and sends the outputs of the gas leak alarms 24a, 24b, . . . to the gate circuit 22 via the diode D10. Next, the operation will be explained. When all of the gas leak alarm devices 24a, 24b, ... are producing a steady monitoring output of 6 volts, the transistor Q1 of the adapter device 23a, 23b, ...
0 is on, turning off transistor Q12 and therefore transistor Q13 of gate circuit 22.
is turned on by the base bias of resistors R12 and R13, and the signal line 21'a is connected to the gas leak alarm 24a,
24b, . . . form a circuit connected to the negative side. Therefore, the transistor Q of the receiving section 30
16 is kept on, transistors Q15 and Q
17 are both off, so the gas leak reception signal E _G and the trouble reception signal E _T are not generated. Next, if the gas leak alarm 24a produces a gas leak detection output of 12 volts, the diode D10
Zener diode of gate circuit 22 through
Twelve volts are applied to ZD10, making it conductive and turning on transistor Q14 . Therefore, a potential difference of 12 volts occurs between the signal lines 21a and 21'a, and the Zener diode of the receiving section 30
ZD11 also becomes conductive, transistor Q15 turns on, and a gas leak reception signal E _G is output to display a gas leak alarm. Next, if the AC100V power to the gas leak alarm 24a is cut off while the other gas leak alarms 24b, ... are producing a steady monitoring output of 6 volts, and a trouble occurrence output of 0 volts is produced, the adapter device Transistor Q10 of 23a is turned off, transistor Q12 is turned on, and transistor Q13 of gate circuit 22 is forcibly turned off. For this reason, the base current of the transistor Q16 of the receiving section 30 flowing through the signal line 21'a is cut off, turning off the transistor Q16 , and thereby turning on the transistor Q17 , so that the trouble reception signal E _T is output. Displays a warning when trouble occurs. Note that in a state where at least one gas leak alarm is producing a gas leak detection output of 12 volts, even if another gas leak alarm produces a trouble occurrence output of 0 volts, the transistor Q14 of the gate circuit 22 and the receiving section 30 The ON state of each transistor Q15 remains unchanged, and priority is given to the gas leak detection output. In the embodiment shown in FIG. 3, the gate circuit 13 and the adapter devices 14a, 14b, . . . are each made into independent units, but the gate circuit 13 and the adapter devices 14a, 14b, . Gas leak alarm 15a, 15
b, . . . may be connected to signal lines. Similarly, in the embodiment shown in FIG. 5, the gate circuit 22 and the adapter devices 23a, 23b, . . . are provided in one unit, and this unit includes the gas leak alarm 24a,
24b, . . . may be connected to signal lines. [Effects of the invention] As explained above, according to the invention, a plurality of gas leak alarms that generate at least three different voltage outputs: a steady monitoring output, a gas leak detection output, and a trouble detection output are installed in the center. Two switching means are installed in the circuit section commonly connected to the signal line from the gas leak detection output and the trouble detection output to turn on and off the signal line according to the discrimination conditions for the gas leak detection output and the trouble detection output, enabling centralized monitoring. Even if the number of gas leak alarms monitored by one centralized monitoring panel increases, it is only necessary to install one relay device for each area.
It is only necessary to install the number of receivers on the central monitoring panel corresponding to the set area, which has the effect of simplifying the device configuration and reducing costs without compromising the gas leak monitoring function. can get.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional gas leakage central monitoring device, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram showing a specific circuit configuration of Fig. 2. FIG. 4 is a block diagram showing another embodiment of the present invention, and FIG. 5 is a circuit diagram showing a specific embodiment of FIG. 4. 1a-1n, 15a, 15b, 24a, 24b
...Gas leak alarm, 2a~2n, 12A, 12
B, 12... Repeater, 3, 10... Central monitoring board,
11, 21A, 21N...Signal line, 13A,
13B, 13, 22, 22A, 22N ... Gate circuit, 14a, 14b, 23a, 23b... Adapter device, 30A, 30N, 30 ... Receiving section, 1
6, 18, 19, 20...Signal line, Q1, Q
2, Q10-Q12, Q15-Q17...transistor, ZD1-ZD3, ZD10, ZD11...Zener diode, PD1-PD3...light-emitting diode, PQ1, PQ2...phototransistor, D
1-D3, D10...diode, R1-R8,
R10 to R19...Resistor, Q3, Q13 ...Transistor (first switching means), Q4, Q
14...Transistor (second switching means).

Claims (1)

[Scope of claim for utility model registration] Outputting a predetermined normal signal voltage in a normal monitoring state,
Connect the outputs of multiple gas leak alarms, which output a gas leak signal voltage higher than the normal signal voltage in the gas leak detection state, and whose output signal voltage becomes zero in the power-off state, to the signal line from the center side. In a centralized monitoring device for gas leak alarms that is commonly connected and centrally monitored so that a higher voltage is output with priority, the circuit unit that commonly connects a plurality of gas leak alarms to the signal line, Trouble determining means for determining that the output voltage of at least one of the plurality of gas leak alarms has become zero due to power cutoff; and receiving a gas leak signal voltage from at least one of the plurality of gas leak alarms. a first switching means that operates when a discrimination output of the trouble discrimination means is obtained; and a second switching means that operates when a discrimination output of the gas leak discrimination means is obtained. and, when both the first and second switching means are inactive, the signal line is turned on and the first switching means is turned on.
A centralized monitoring device for a gas leak alarm, characterized in that the signal line is turned off when only the second switching means is operated, and the signal line is turned on when the second switching means is operated.