JPS636918B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an alarm system that combines fire monitoring and theft monitoring and is suitable for facilities such as museums or art galleries that allow people to enter at set times. In general, in addition to fire detectors, facilities such as museums and art galleries are equipped with theft detectors that detect intruders at night and issue alarms to prevent theft of exhibits. A receiver is installed in the monitoring room for each type of theft monitoring and theft monitoring, and individual vigilance is performed. However, theft monitoring is not necessary during times when people come and go, such as during the day, and theft monitoring only needs to be activated at night when the facility is closed. On the other hand, fire monitoring requires constant monitoring regardless of the time of day, but if there are people coming or going, you can immediately receive a report of a fire; If the alarm is triggered by the output of the detector, there is a risk of malfunction due to cigarette smoke etc. from visitors. desirable. In this way, when conducting a combination of fire monitoring and theft monitoring in facilities such as museums, whether or not to output an alarm varies depending on the time of day and the presence or absence of visitors, and individual monitoring systems may not be accurate. The problem is that it is not possible to issue an alarm. The present invention has been made in view of the above, and it is an object of the present invention to provide an alarm device that can accurately issue fire and theft alarms depending on the time of day and the presence or absence of people. That is, according to the present invention, a detection signal sent from a fire detector or theft detector installed in a restricted area is received and output for identification, and a changeover switch is set to the first changeover position during the daytime. By doing so, the fire alarm will be issued only in response to a fire signal when a theft detection signal is not obtained.
There is provided an alarm device characterized in that, at night or the like, by setting the changeover switch to the second changeover position, an alarm is issued in response to each of the identified fire and theft signals. Hereinafter, the present invention will be explained based on the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. First, to explain the configuration, 1 is a receiver installed in a guard room, etc., and a pair of signal lines 2, 2'
The terminal device 3 is connected to the terminal device 3 installed in the guarded area. Note that the terminal device 3 is provided for each caution area and is connected in parallel to the lines 2 and 2'. The terminal device 3 is provided with a theft detector 4 and fire detectors 5, 6, and the detection signals of each detector 4, 5, 6 are amplified by amplifiers 7A, 7B, 7C, and are sent to switching circuits 8A, 8B. , 8C, and by the operation of the switching circuits 8A to 8C, each detection signal is sent to the receiver as a unique signal of frequencies _a , _b , and _c from the unique signal transmitters 9A, 9B, and 9C using tuning fork oscillators, etc. It is sent to 1. As the theft detector 4, an infrared type or ultrasonic type detector is used, and a detection output is generated when a person is present in the guarded area. Further, the fire detector 5 is a highly sensitive detector using a flame detector or an ionization smoke detector, while the fire detector 6 is a relatively low-sensitivity detector such as a heat detector. When the high-sensitivity sensor 5 is likely to malfunction due to smoke, for example, a monitoring mode can be set in which an alarm is issued only when the low-sensitivity sensor 6 detects a fire. Note that although frequency type transmitters are used as an example of the characteristic signal transmitters 9A, 9B, and 9C, other characteristic signal transmitters such as a pulse code type, a characteristic resistance type, etc. may be used. FIG. 2 is a block diagram showing one embodiment of the circuit configuration of the receiver used in the embodiment of FIG. 1. In FIG. 2, 10 is a signal identification unit that receives the unique signal sent from the terminal device, identifies the signal by frequency discrimination, and identifies the theft signal e ₁ , the high-sensitivity fire signal e ₂ , and the low-sensitivity fire signal. Output each of e ₃ separately. Reference numerals 11, 12, and 13 denote changeover switches that are operated in conjunction with each other, and have a first switching position D, which is a daytime monitoring mode shown by a dotted line, and a second switching position N, which is a nighttime monitoring mode, shown by a solid line. have 14 is a switching circuit activated by the theft signal _e1 applied via the changeover switch 11, which activates the theft alarm relay 15, which closes the relay contact 15a and lights up the theft alarm indicator light 16. I have to. On the other hand, 17 is a switching circuit that operates the fire alarm relay 18;
is the high-sensitivity fire signal e ₂ when the changeover switch 12 is switched to the N position, and the changeover switches 12 and 13
The AND gate output is determined by the logic conditions of the inverter 19 and the AND gate 20 based on the theft signal e ₁ and the high sensitivity fire signal e ₂ when the switch is switched to the D position, and the low sensitivity fire signal e ₃ respectively. It works. The fire alarm relay 18 has a contact 18a, and when the contact 18a is closed, the fire alarm indicator light 21 is turned on. In addition, 22 is a DC power supply, and in addition to the above-mentioned indicator lights 16 and 21, a relay 1 is used as an alarm display means.
Buzzers, bells, etc. are installed to issue an alarm when the alarms 6 and 18 are activated. Next, the operation will be explained with reference to FIGS. 1 and 2. First, for the theft signal e ₁ and the fire signal e ₂ obtained by the signal identification unit 10 of the receiver 1, selector switch 1
The operation of alarm relays 15 and 18 according to switching positions D and N of switches 2, 13 and 14 is set as shown in Table 1 below. In the table, “1” indicates when there is a signal,
When there is none, it is indicated by "0".

[Table] As is clear from Table 1 above, first, when the facility is closed, such as at night, the changeover switches 12, 13, and 14 are switched to the positions shown in the figure. The theft signal e ₁ and fire signal e ₂ identified by the identification unit 10 are transmitted to the changeover switch 1
Direct switching circuit 14,1 via 1,12
7, the theft alarm relay 15 or the fire alarm relay 18 is activated, and the fire alarm or theft alarm is output as is. The low-sensitivity fire signal _e3 obtained by installing the low-sensitivity fire detector 6 is transmitted through the changeover switch 11,
Regardless of signals 12 and 13, the signal is directly applied to the switching circuit 17, activates the fire alarm relay 18, lights up the fire alarm indicator light 21, and issues a fire alarm. In this way, in addition to the highly sensitive fire detector 5,
The reason why the low-sensitivity fire detector 6 is provided is that during the daytime, etc., the high-sensitivity fire detector 5
This is to ensure that an alarm is output in case of a fire, even if the alarm output is stopped when the alarm is activated. Next, during time periods such as daytime when people are coming and going, the changeover switches 11, 12, and 13 are switched as shown by dotted lines. For example, if a theft signal _e1 is received and output at this switching position, the changeover switch 1
1 opens the connection to the switching circuit 14, so the theft alarm relay 15 does not operate. Next, when the fire signal e ₂ is output while the theft signal e ₁ is being obtained, the theft signal e ₁ is inverted by the inverter 19 to inhibit the AND gate 20, and the fire signal e ₂ is output. In this case, the switching circuit 17 will not operate and no fire alarm will be issued. In this situation, a fire is detected in the presence of a person, and there is a risk of malfunction due to cigarette smoke, for example, and even if there is a fire, it will be immediately known by a person reporting it. Further, there is no problem since the alarm is subsequently issued by the fire signal _e3 from the low sensitivity fire detector 6. Furthermore, when the theft signal e ₁ is not obtained, that is, when there is no person in the warning area, the fire signal e ₂
When this is obtained, the output of the inverter 19 becomes " ₁ " and the AND gate 20 is placed in the permissive state. The fire alarm relay 18 is activated by closing the contact 18a, which lights up the fire alarm indicator light 21 and sounds a buzzer or the like to notify the fire. In the above embodiment, the fire signal _e3 from the low-sensitivity fire detector ₆ is used to issue only a fire alarm, but for example, fire extinguishing equipment and When trying to start the smoke evacuation equipment, it is necessary to know whether there are people in the warning area where the fire is occurring, so in such a case, an alarm can be displayed using the theft signal e ₁ . It is desirable to do so. As described above, according to the present invention, detection signals sent from fire detectors and theft detectors installed in restricted areas through a common signal line are received and output for identification, and By setting the changeover switch to the first position, the fire alarm is issued only in response to a fire signal when no theft detection signal is obtained. By setting the device to the second switching position, the alarm is issued based on the fire signal and theft signal that are received and identified.Compared to conventional devices that monitor and issue alarms for fire and theft individually, Fire and theft alarms can now be issued in accordance with the situation in the restricted area, making it possible to reduce false alarms during fire monitoring, especially when people are in and out. This provides the advantage of being able to accurately monitor fires and theft in facilities where people enter and exit at designated times. Further, regardless of the switching position, by receiving a fire signal from a low-sensitivity fire detector and issuing a fire alarm, it is possible to send out a fire alarm more reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a circuit block diagram showing an embodiment of the receiver shown in FIG. 1... Receiver, 2, 2'... Signal line, 3...
Terminal device, 4... Theft detector, 5... Fire detector (high sensitivity), 6... Fire detector (low sensitivity), 7A~
7C...Amplification unit, 8A to 8C...Switching circuit, 9A to 9C...Unique signal transmitter, 10...Signal identification unit, 11, 12, 13...Switching switch,
14, 17... Switching circuit, 15... Burglar alarm relay, 18... Fire alarm relay, 16...
Burglar alarm indicator light, 21...Fire alarm indicator light, 19
...Inverter, 20 ...And gate, 15
a, 18a...Relay contact, 22...DC power supply.

Claims (1)

[Claims] 1. A signal line from the receiver includes a fire detector that detects a change in physical quantity caused by a fire in a predetermined warning area and outputs a fire signal, and a fire detector that detects an intruder into the warning area. In the alarm device connected to a terminal device equipped with a theft detector that outputs a theft signal, the receiver identifies and outputs each of the fire signal and theft signal received from the terminal device via the signal line. and a changeover switch, in which the first changeover position of the changeover switch allows the output of the identified fire signal only when the signal recognition part is not outputting a theft signal; In the second switching position of the switch, there is provided a logic circuit that allows the output of the signal identification section as is, and an alarm display section that issues and displays a fire alarm or theft alarm according to the output of the logic circuit. Features an alarm device.