JPH01142896A - Fire alarm - Google Patents

Abstract

PURPOSE:To detect the initial time of fire generation and to prevent the generation of unnecessary feeling of uneasiness or confusion by ringing a main acoustic device on the receiver side and sectional acoustic devices arranged in respective alarm sections at respectively different deciding levels. CONSTITUTION:A receiver 1 decides whether a fire is generated or not from return data from plural sensors 2. When return data more than a prescribed level are continuously generated from one sensor 2 for a fixed period, the possibility of fire generation is decided and the main acoustic device 16 is driven to a manager or the like warning. When the detecting level from the sensor 2 is returned to a normal value or continuously reduced even if the detecting level once exceeds the prescribed level, the sensor is restored to the normal monitoring state. When return data exceeding the prescribed levels are generated from two or more sensors 2, the main acoustic device 16 is driven and a command for driving a sectional acoustic device 4 is generated to a terminal equipment 3 arranged in the section requiring refuge. Consequently, quick alarm can be attained and the generation of unnecessary feeling of uneasiness or confusion can be prevented.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a fire alarm system, and particularly to a fire alarm system in which a main sound device on the receiver side and a district sound device installed in each warning area are set to sound at different judgment levels. Regarding the fire alarm system.

[Prior Art] Conventionally, fire alarm systems have a detector that detects heat, smoke, etc. of a fire phenomenon, and transmits an analog signal indicating the magnitude of the detected phenomenon to the receiver side without making a judgment. Some systems use detection data from multiple sensors to determine whether a fire has occurred. In order to notify the occurrence of a fire, the main acoustic device (bell, buzzer, etc.) installed on the receiver side is generally sounded to notify the manager of the building management room, and at the same time, evacuation is determined based on the location of the fire. Local sound equipment (bells, sirens, etc.) in the required areas is sounded to alert people to the occurrence of a fire.

[Problems to be Solved by the Invention] Conventionally, fire alarm systems often give false alarms and cause unnecessary anxiety and confusion to the general public due to the sounding of local sound equipment. Therefore, it is better to sound the district sound equipment based on a reliable judgment of the occurrence of a fire, but the main sound equipment in the building management room is desirable for early warning, and for this reason, the main sound equipment of the receiver should be set in each alert area. If the district acoustic equipment installed in the area is made to sound at the same judgment level, there will be many false alarms and there will be a lack of early warning.

[Means for Solving the Problems] The fire alarm device of the present invention includes means for causing a main sound device to sound when a detection signal from one fire detector is continuously at a predetermined level or higher for a certain period of time; A means for restoring the normal monitoring state when the detection signal from the fire detector returns to a normal value within a certain period of time after it exceeds a predetermined level or decreases continuously, and detection from the fire detector. It is equipped with a means for sounding the main acoustic device and the district acoustic device to notify the occurrence of a fire if the detection signal from another fire detector exceeds the specified level while the signal exceeds the specified level. , the district sound system is based on a reliable judgment of the occurrence of a fire, and the main sound system can be activated upon detecting the initial phenomenon of a fire outbreak.

Embodiment FIG. 1 is an overall configuration diagram showing an embodiment of the fire alarm system of the present invention. This fire alarm system includes a receiver 1, a transmission line 5 extending from the receiver 1, a plurality of fire detectors 2 connected to the transmission line 5 for detecting heat, smoke, etc. caused by a fire phenomenon, and a transmission line 5. 5 and a plurality of terminal devices 3 for controlling district audio equipment 4 provided in each warning area. The operation panel of the receiver 1 is equipped with a display window for displaying the area where the fire occurred, operation switches and numeric keypad switches for inputting various operations, and a main sound device 16 such as a bell and a buzzer.

To explain the operation of the fire alarm system of the present invention configured in this way, during normal monitoring, the receiver 1 sequentially calls out the fire detectors 2 using a transmission means, and the called out detectors 2 detect the fire. Data indicating analog quantities of heat, smoke, etc. is returned. The receiver 1 determines whether or not a fire has occurred based on the data returned from the plurality of sensors 2. If there is data returned from one sensor 2 at a predetermined level or higher continuously for a certain period of time, it is determined that there is a possibility of a fire occurring, and the main sound device 1
6 to alert the manager, etc. Even if the detection level from the sensor 2 exceeds a predetermined level, if it returns to a normal value or decreases continuously, the normal monitoring state is restored. Furthermore, if there is return data exceeding a predetermined level from two or more sensors 2, the main sound device 16 is sounded, and at the same time, a command is issued to the terminal device 3 in the area requiring evacuation to make the district sound device 4 sound. . Upon receiving the command, the terminal device 3 causes the district acoustic device 4 to sound to notify the fire outbreak.

The receiver 1 is constructed as shown in the block diagram shown in FIG. This receiver 1 includes a central processing bag W10 consisting of a microprocessor, etc., and a program.

A storage device 11 that stores data, etc., and a transmission interface 12 that sends and receives signals to and from the sensor 2 and terminal device 3.
．． It is composed of an input/output interface 13, an operation section 14 consisting of various switches, a display section 15 consisting of fire area and various indicator lights, and a main sound device 16 such as a bell or buzzer. When the power is turned on, the central processing unit 10 executes a monitoring processing program stored in the storage device 11. By this processing program, the central processing unit 10
is an interface 12 that transmits address and command signals.
Output to.

The transmission interface 12 parallel-serial converts the address and command signals and outputs them to the transmission line 5 according to predetermined timing. Since the command during monitoring is data collection, the sensor 2 designated by the unique address outputs return data to the transmission line 5. This return data is received by the transmission interface 12, serial-parallel converted, and taken into the central processing unit 10. In this way, analog data from all the sensors 2 is sequentially collected at a predetermined period and monitored. When the central processing unit 10 determines that there is a possibility of a fire occurring based on the data returned from the sensor 2, it causes the main sound device 16 to sound through the input/output interface 13 and operates the display unit 15 to display this area. The manager of the building management room or the like can check the scene by sounding the main acoustic device 16 and can promptly provide evacuation guidance and carry out fire extinguishing activities. When the central processing unit 10 recognizes return data exceeding a predetermined level from the two sensors 2, it indicates a highly reliable fire occurrence condition and displays the display unit 15. Main sound device f16
is activated to issue a fire alarm, and at the same time outputs a command for district acoustic sounding to the terminal device 3 in the dangerous area determined from the fire occurrence district, and causes the district acoustic device 4 to sound.

The fire detector 2 is constructed as shown in the block diagram shown in FIG. This sensor 2 includes a transmission section 20 that transmits and receives signals to and from the receiver 1, an address setting section 21 that sets a unique address of the sensor 2, and a sensing section 23 that detects heat, smoke, etc. caused by a fire phenomenon. It is comprised of an A/D converter 22 that converts the analog signal detected by the sensing section 23 into a digital signal and supplies it to the transmission section 20 as return data. Transmission section 2
0 is in the normal receiving state and when it receives a calling signal from the receiver 1 of the transmission line 5, it compares the unique address set in the address setting unit 21 with the address part of the calling signal,
Determine if they match. A if they match
The digital signal of the /D converter 22 is parallel-serial converted and the return data is output to the transmission line 5. A digital signal from the A/D converter 22 indicates the temperature and smoke density detected by the sensing section 23.

The terminal device 3 is configured as shown in the block diagram shown in FIG. This terminal device 3 includes a transmission section 30 that transmits and receives signals to and from the receiver 1, an address setting section 31 that sets a unique address of the terminal device 3, a decoder 32 that identifies a data signal from the transmission section 30, and a decoder 32 that identifies a data signal from the transmission section 30. and a control section 33 that drives the district acoustic device 4 based on control signals of 32. The transmission unit 30 is in a normal receiving state, and when it receives a calling signal from the receiver 1 of the transmission line 5, it compares the unique address set in the address setting unit 31 with the address part of the calling signal and determines whether they match. do. If they match, the data part of the call signal is output to the decoder 32. The decoder 32 decodes the data, and in the case of a command signal to make the district sound device 4 sound, the control unit 33
Outputs a control signal to. The control unit 33 causes the district sound device 4 to sound based on the control signal.

Next, an example of a processing program executed by the central processing unit of the receiver will be explained based on the flowchart shown in FIG.

When the power is turned on, initialization is performed and a variable n indicating the address of the sensor is set to 1 in step S01. Step SO2 calls the sensor (n) and takes in the returned data. Step SO3 determines whether the detection level indicated by the returned data is higher than a predetermined level. If YES, proceed to step SIO; if No, proceed to step SO4. In step SO4, this sensor determines from the fire judgment flag F(n) whether there is returned data exceeding a predetermined level within a predetermined time, and if YES, the process proceeds to step 305, and if NO, the process proceeds to step SO8. SO5 determines whether the detection level of the returned data has become a normal value. If YES, proceed to step S07; if NO, proceed to step SO6. In step SO6, determine whether the detection level of the returned data is continuously decreasing. , if YES, step SO7
If the answer is NO, the process advances to step SO8.

Step SO8 advances the variable n indicating the address one step.

Step SO9 determines whether the variable n has passed the final address N. If YES, return to step S01 and repeat the same process from the first sensor; if NO, step SO2
Return to step 303 and repeat the same process from the sensor at the next address. If the level of the returned data exceeds the predetermined value in step 303, proceed to step S10. Determine whether or not the predetermined level has been exceeded; if YES, proceed to step S14; if NO, proceed to step Sll; step Sll
sets the fire judgment flag F (n). Step S
12 determines whether there are any other detectors that are in the process of determining a fire;
If YES, the process proceeds to step 313; if NO, the process proceeds to step S14. In step S13, the main sound device and the district sound device sound. In step S14, it is determined whether a predetermined period of time has elapsed since the fire judgment was started, and if YES, the process proceeds to step S15, and if NO, the process proceeds to step S08. Step S15 causes only the main acoustic device to sound.

[Effects of the Invention] As explained above, in the fire alarm system of the present invention, the main acoustic device installed on the receiver side is activated when the signal from even one sensor is judged to be dangerous, and the fire alarm system in the area The sound system sounds when a fire is detected with high reliability, allowing managers and others to know the early stages of a fire outbreak, allowing them to confirm and deal with the occurrence of a fire, and for the general public to receive a highly reliable alarm. By being informed, unnecessary anxiety and confusion due to false alarms can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the fire alarm device of the present invention, Fig. 2 is a block diagram showing an embodiment of the receiver of the device, and Fig. 3 is an illustration of the fire detector of the device. FIG. 4 is a block diagram showing an embodiment of the terminal device of the same device, and FIG. 5 is a flowchart showing an example of a processing program executed by the central processing unit of the receiver. . 1... Receiver, 2... Sensor, 3... Terminal, 4
... District acoustic device, 5 ... Transmission line, 10 ... Central processing unit, 11 ... Storage device, 12 ... Transmission interface, 13 ... Input/output interface, 1
4... Operation unit, 15... Display unit, 16... Main sound device, 20.30... Transmission unit, 21.31... Address setting unit, 22... A/D converter , 23... Sensing section, 32... Decoder, 33... Control section.

Claims (1)

[Claims] A plurality of fire detectors installed in the monitoring area, a receiver that determines the occurrence of a fire based on the detection signal from the fire detector, a main acoustic device installed in the receiver, and a fire detector installed in each warning area. In a fire alarm system comprising a district acoustic device that is installed and sounds under control from the receiver, the main sound is emitted when the detection signal from the one fire detector is continuously at a predetermined level or higher for a certain period of time. a means for causing the device to sound; and a means for causing the device to sound when the detection signal from the fire detector returns to a normal value or decreases continuously within the predetermined period of time from the time when the detection signal exceeds the predetermined level. means for restoring to a monitoring state; and when the detection signal from the fire detector exceeds the predetermined level and the detection signal from another fire detector exceeds the predetermined level, the main sound device and a means for sounding the district acoustic device to notify the occurrence of a fire.