JPH0528880B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a fire alarm system, and in particular 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 ringing of local sound equipment. Therefore, it is better to use district sound equipment based on a reliable judgment of the occurrence of a fire, but it is desirable that the main sound equipment in the building control room be used for early warning. For this reason, if the main acoustic device of the receiver is made to sound at the same judgment level as the district acoustic devices installed in each warning area, there are drawbacks such as a large number of false alarms and 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. , district sound equipment is based on reliable fire occurrence determination;
The main acoustic device 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 and a transmission line 5 extending from the receiver 1.
, a plurality of fire detectors 2 connected to this transmission line 5 to detect heat, smoke, etc. caused by a fire phenomenon, and a transmission line 5
The terminal device 3 is connected to a plurality of terminal devices 3 for controlling the district audio equipment 4 provided in each warning area. The operation panel of receiver 1 has a display window that displays the area where the fire occurred, operation switches and numeric keypad switches for inputting various operations, and a bell.
A main sound device 16 such as a buzzer is provided.

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 assumed that there is a possibility of a fire occurring, and the main sound device 16 is sounded to alert the manager or the like. Even if the detection level from sensor 2 exceeds the predetermined level,
After that, if the value returns to normal or continues to decrease, the normal monitoring state is restored. Also 2
If there is return data exceeding a predetermined level from more than one sensor 2, the main sound device 16 is made to sound, 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 unit 10 consisting of a microprocessor or the like, a storage device 11 storing programs, data, etc., a transmission interface 12 for transmitting and receiving signals to and from a sensor 2 and a terminal device 3, and an input device. Output interface 13
, an operating 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 central processing unit 10 is powered on,
The monitoring processing program stored in the storage device 11 is executed. According to this processing program, the central processing unit 10 outputs an address and a command signal to the transmission interface 12. 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, monitoring is performed by collecting analog data from all the sensors 2 at predetermined intervals. 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 via the input/output interface 13 and also 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 determines that a highly reliable fire has occurred and operates the display unit 15 and the main sound device 16 to issue a fire alarm. A district sound ringing command is output to the terminal device 3 in the dangerous area determined from the area of occurrence, and the district sound device 4 is made to ring.

The fire detector 2 is constructed as shown in the block diagram shown in FIG. This sensor 2 is connected to the receiver 1
a transmission unit 20 that transmits and receives signals to and from the sensor 2;
Address setting section 21 for setting the unique address of
and a sensing unit 23 that detects heat, smoke, etc. caused by a fire phenomenon.
and 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. When the transmission unit 20 is in a normal receiving state and 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 and determines whether they match. . If they match, the digital signal from the A/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 constructed 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, and a decoder 3 that identifies data signals from the transmission section 30.
2, and a control section 33 that drives the district acoustic device 4 based on a control signal from the decoder 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 outputs a control signal to the control unit 33 in the case of a command signal for making the district sound device 4 ring. 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 the steps
In S01, a variable n indicating the address of the sensor is set to 1. Step S02 calls the sensor n and takes in the returned data. Step S03
It is determined whether the detection level indicated by the returned data is above a predetermined level, and if YES, the process proceeds to step S10, and if NO, the process proceeds to step S04. In step S04, this sensor determines from the fire judgment flag F(n) whether the returned data exceeding a predetermined level has been received within a predetermined time, and returns YES.
If so, go to step S05, if NO, go to step S05.
Proceed to S08. In step S05, it is determined whether the detection level of the returned data has reached a normal value. If YES, the process proceeds to step S07; if NO, the process proceeds to step S06. In step S06, it is determined whether the detection level of the returned data is continuously decreasing. If YES, the process proceeds to step S07; if NO, the process proceeds to step S08. Step S08 advances the variable n indicating the address one step.
In step S09, it is determined whether the variable n has passed the final address N. If YES, the process returns to step S01 and repeats the same process from the first sensor. If NO, the process returns to step S02 and repeats the same process from the sensor at the next address. If the level of the returned data exceeds the predetermined value in step S03, the process returns to step S10.
The process proceeds to step S10, where the fire judgment flag F(n) is displayed.
Determine whether a predetermined level has been exceeded previously from
If YES, proceed to step S14; if NO, proceed to step S11. In step S11, a fire judgment flag F(n) is set. In step S12, it is determined whether another sensor is currently determining a fire. If YES, the process advances to step S13; if NO, the process advances to step S14. Step S13 sounds the main sound device and the district sound device. 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 provided on the receiver side is sounded when even a signal from 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 drawings]

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 same device, and Fig. 3 is an illustration of the fire detector of the same 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. be. 1... Receiver, 2... Sensor, 3... Terminal,
4...District sound equipment, 5...Transmission line, 10...
Central processing unit, 11...Storage device, 12...Transmission interface, 13...I/O interface, 14...Operation unit, 15...Display unit, 16...
...Main sound device, 20,30...Transmission section, 21,3
1...Address setting section, 22...A/D converter,
23... Sensing unit, 32... Decoder, 33... Control unit.

Claims (1)

[Claims] 1. 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 each warning area. In a fire alarm system consisting of a district acoustic device installed at a means for making an acoustic device sound; and a means for making a noise from the fire detector; when the detection signal from the fire detector exceeds the predetermined level and the detection signal returns to a normal value or continuously decreases within the predetermined period of time; means for restoring the monitoring state to the 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 1. A fire alarm system comprising: a fire alarm system; and a means for sounding the district sound system to notify the occurrence of a fire.