JPH09288781A - Fire detecting system with storing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm whether a real fire is generated by transmitting a time storing signal with a fire signal from a fire sensor to a fire receiver so as to transmit a fire confirming signal after the lapse of the storing time by means of the fire receiver. SOLUTION: A fire sensing part 12 detects scattered light generated by the smoke particles of light beams irradiated from a light projecting element by means of a photodetective element, converts this scattered light to smoke density data and stores it in a detected data storing part 13. When a comparing and judging part 16 judges that levels of smoke density, etc., exceeds a fire judging level as the result of comparing, an average calculation part 14 calculates the average of stored data and a time storing signal generation part 15 generates a corresponding time storing signal. A transmission control part 17 in the fire sensor 1 transmits the time storing signal to the fire receiver 2 with the fire signal. The fire receiver 2 starts the timing of the storing time from the point of the transmitting time and when a signal showing that the fire sensor 1 receives the fire signal exceeding a fire judging level is sent back, outputs a fire alarm from an alarm outputting part 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detection system having a storage function, which is configured by connecting an on / off type fire detector to a fire receiver.

[0002]

2. Description of the Related Art Conventionally, a fire detection system has been introduced into an apartment house or the like to enable early detection of a fire. The configuration of this fire detection system is shown in FIG. The fire receiver 2 set in the manager's room or the like is connected to the fire detector 1 installed in each room or corridor through the relay 3 and the signal line L such as the multiple signal line as necessary. The fire detector 1 always detects smoke density and environmental temperature,
The fire receiver 2 outputs an alarm when these levels exceed a preset fire determination level.

However, in such a configuration, when the fire detector 1 is a smoke detector, the smoke concentration may exceed the fire judgment level due to cigarette smoke or water vapor, and a fire may be erroneously judged and an alarm may be output. is there. Therefore, in order to prevent such a malfunction, a fire detection system having a storage function has become widespread. FIG. 7 shows an example of the operation of the fire detection system having a storage function.

The fire detector 1 in this case is of an analog type and constantly transmits data such as smoke density to the fire receiver 2. The fire receiver 2 does not output an alarm when the smoke density or the like exceeds the fire judgment level, and the predetermined accumulation time T0
Even after the lapse of time, if the smoke density and the like exceeds the fire judgment level, it is judged that it is a real fire and an alarm is output (a). Also,
After the accumulation time T0 has passed, if the smoke density or the like does not exceed the fire determination level, it is determined that there is no fire and no alarm is output (b). This ensures that there is no false alarm in the fire receiver 2.

However, since the amount of smoke generated from cigarette smoke is small even if the smoke concentration exceeds the fire judgment level,
In many cases, the fire judgment level will not be exceeded after a certain time T1 (several seconds), so if the storage time is set to be T1 or more and close to T1, it is possible to detect a fire early. However, there are various causes in the case of non-fire, and the duration for which smoke concentration exceeds the fire judgment level is not constant, so sufficient accumulation time must be set to prevent false alarms. .

In consideration of this point, a fire detection system capable of varying the accumulation time has been developed. An example of the operation at this time is shown in FIG. Note that FIG. 8A shows the case of an actual fire, and FIG. 8B shows the case of no fire. Here, in order to make the accumulation time variable, when the level of smoke density or the like exceeds the fire judgment level, within the past predetermined time T2 (hatched portion).
The average value of levels such as smoke density is calculated, and the accumulation time is set based on this value.

In other words, if the average value of the smoke concentration level is large, the level is gradually increasing, so it is judged that the fire is a real fire, and a relatively short accumulation time T3 (for example, 10 seconds) is set, while the average value is set. If the value is small, the level is rising rapidly, so it is determined that there is no fire, and the storage time T4 is relatively long.
(For example, 50 seconds) is set. In this way, by making the accumulation times T3 and T4 variable in the fire receiver 2, a fire detection system can be realized in which a fire can be detected early and there is no false alarm.

[0008]

As described above, in the above-described conventional fire detection system having the accumulation function, since the accumulation time is made variable in the fire receiver, the fire detector always keeps the smoke concentration and the ambient temperature at the same time. It had to be an analog type that transmitted level data as analog data. However, some fire detectors have an on / off type that is configured to send a fire signal to the fire receiver when the detected smoke concentration or temperature level exceeds the fire judgment level. The problem was to develop a fire detection system that can change the storage time even if a firearm is applied.

The present invention has been made in view of the above circumstances. Even if an on-off type fire detector is applied, the accumulation time can be varied to detect a fire early and to prevent the occurrence of false alarms. It is an object to provide a fire detection system having the above.

[0010]

A fire detection system having a storage function according to claim 1 of the present invention, which has been proposed to achieve the above object, comprises an on / off type fire detector, a fire receiver, and a fire detector. By transmitting the fire time signal and the fire time signal, the fire receiver measures the fire time.

Here, the on-off type fire detector constantly updates the data of the smoke concentration and the temperature level detected by the fire detector and the smoke concentration and the temperature level detected within a predetermined time by the fire detector. A detection data storage unit for storing,
An average value calculation unit that calculates the average value of the smoke density and temperature level data accumulated in this detection data accumulation unit, and an accumulation time signal that generates an accumulation time signal corresponding to the average value calculated by this average value calculation unit The smoke density or temperature level exceeds the fire judgment level as a result of the comparison judgment unit comparing the smoke density or temperature level detected by the generation unit and the fire detection unit with the preset fire judgment level. In the case of a fire signal, the transmission control unit that transmits the accumulation time signal generated by the accumulation time signal generation unit to the fire receiver is provided, while the fire receiver stores the fire signal together with the fire signal from the transmission control unit of the fire detector. When the time signal is sent,
After the accumulation time of this accumulation time signal has elapsed, a fire confirmation signal is sent to the fire detector, and the fire detector that sent the fire signal receives a fire signal that exceeds the fire judgment level. A fire determination unit that determines that a fire has occurred is sent back when a reply signal indicating is returned.

In claim 2, the fire detector of claim 1 is
Further, when the accumulation time signal is transmitted together with the fire signal, the fire flag is turned on, and the fire flag is kept on until the comparison result of the comparison and determination unit becomes lower than the smoke determination level or the smoke determination level. It is equipped with a fire flag setting unit, and when a fire confirmation signal is sent from the fire receiver, by reading the state of the fire flag,
A reply signal indicating that a fire signal exceeding the fire judgment level has been received is returned to the fire receiver.

According to another aspect of the present invention, there is provided a fire detection system having a storage function, wherein the on / off type fire detector transmits a fire signal to a fire receiver, and after the storage time has elapsed,
If a real fire has occurred, a fire confirmation signal different from the fire signal is transmitted to the fire receiver again to fulfill the storage function. Here, the on-off type fire detector includes a fire detection unit, a detection data storage unit, an average value calculation unit, and a storage time calculation unit that calculates a storage time corresponding to the average value calculated by the average value calculation unit. , The comparison and determination unit, and as a result of comparison by the comparison and determination unit, when the smoke concentration or the temperature level exceeds the fire determination level, the transmission control unit that transmits a fire signal to the fire receiver is provided. When the accumulation time calculated by the accumulation time calculation unit has elapsed since the fire signal was sent and the comparison result of the comparison judgment unit indicates that the smoke concentration or temperature level exceeds the fire judgment level, a fire confirmation signal is sent. While transmitting to the fire receiver, when the fire receiver receives the fire confirmation signal from the transmission control unit of the fire detector,
A fire judging unit is provided for judging that a fire has occurred.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of a fire detection system having a storage function according to claims 1 and 2 of the present invention. This fire detection system includes a fire detector 1 through a signal line L to a fire receiver 2.
If the fire receiver 2 determines that a fire has occurred, it will output an alarm, and will activate the sound of the district audio system connected by other signal lines and the interlocking of smoke control equipment. To do.

As shown in the figure, an on-off type fire detector 1
Is a signal processor 11 including a CPU, a fire detector 12 for detecting smoke concentration or environmental temperature, and a smoke concentration or temperature level data detected by the fire detector 12 within a predetermined time. The detection data storage unit 13 that stores while updating, an average value calculation unit 14 that calculates the average value of the smoke density and temperature level data stored in the detection data storage unit 13, and the average value calculation unit 14 Storage time signal generation unit 15 that generates a storage time signal corresponding to the average value
And a comparison / determination unit 16 for comparing the smoke concentration or temperature level detected by the fire detection unit 12 with a preset fire determination level.
When the smoke concentration or the temperature level exceeds the fire determination level as a result of comparison by the comparison / determination unit 16, a transmission control for transmitting the fire time and the storage time signal generated by the storage time signal generation unit 15 to the fire receiver 2. Unit 17 and transmission control unit 1
When 7 transmits the fire signal and the accumulation time signal, the fire flag is turned on, and the comparison result of the comparison / determination unit 16 is
A fire flag setting unit 18 that holds the fire flag in the ON state until the smoke density and the temperature level fall below the fire determination level.

Here, the accumulation time signal generator 15 is provided with a memory table in which an optimum accumulation time is stored for the average value of the smoke density and temperature level data accumulated in the detection data accumulator 13. However, a calculation formula for calculating the optimum storage time is stored in advance, and when the smoke concentration or temperature level detected by the fire detection unit 12 exceeds a predetermined fire determination level, the detection data storage unit 13 stores the data. The configuration may be such that the average value of the obtained data is read, the optimum storage time is calculated, and the data is generated as a signal.

On the other hand, the fire receiver 2 sends and receives signals to and from the fire detector 1 via a signal processing section 21 composed of a CPU, a fire judging section 22 for judging the occurrence of a fire, and a signal line L. An alarm output unit 24 including a transmission control unit 23 that performs the alarm, a speaker that outputs an alarm sound, and an indicator lamp that performs an alarm display.
Is provided. The basic operation of the system of the present invention having the above configuration will be described with reference to FIG.

In the fire detector 1, the smoke detector 12 constantly detects the smoke density and the ambient temperature, and stores them in the detection data storage 13 (100, 101). In this detection data storage unit 13, the number of data (for example, one minute) that is the target of the average value calculation in the average value calculation unit 14 is always stored. For example, the oldest data is detected every time new data is detected. It is designed to overwrite the data.

When the fire detector 1 is a smoke detector, the fire detector 12 detects, in the smoke monitoring area in the optical chamber, light scattered by smoke particles of the light beam emitted by the light projecting element, by the light receiving element. The detected scattered light is converted into smoke density data and stored in the detection data storage unit 13. In addition, each time the fire detection unit 12 detects a smoke density or the like, the comparison and determination unit 16 compares the smoke density or the like level with the fire determination level (in the case of a smoke detector, for example, 10% / m). (102) As a result, when the level of smoke density or the like exceeds the fire determination level, the average value calculation unit 14 calculates the average value of the data stored in the detection data storage unit 13 at this time ( 103), the accumulation time signal having the accumulation time corresponding to this average value is generated in the accumulation time signal generator 15 (104).

That is, if the calculated average value is large (for smoke detectors, for example, 7% / m), there is a high possibility that it is an actual fire, so the accumulation time is relatively short (for example, 10 seconds).
If the average value is small (for smoke detectors, for example, 2% / m), there is a high possibility of non-fire, so a relatively long time (for example, 50 seconds) is set for the accumulation time. After that, the transmission control unit 17 of the fire detector 1 transmits the accumulation time signal together with the fire signal to the fire receiver 2 (1
05). At the same time, the fire flag setting unit 18 turns on (sets) the fire flag, and holds the fire flag on until the smoke concentration level by the comparison determination unit 16 falls below (does not exceed) the fire determination level. . In other words, if it is a real fire, the fire flag is held in the ON state,
If there is no fire, the fire flag returns to the off state (reset).

On the other hand, the fire receiver 2 starts measuring the accumulation time included in the accumulation time signal from the time when the accumulation time signal is transmitted from the fire detector 1 together with the fire signal (107). After a lapse of time, a fire confirmation signal is transmitted to the fire detector 1 (108). On the other hand, when a signal indicating that the fire flag of the fire flag setting unit 18 is on, that is, a signal indicating that the fire detector 1 receives the fire signal exceeding the fire judgment level, (109), the fire determination unit 22 determines that a real fire has occurred, and outputs a fire alarm from the alarm output unit 24 (1
10).

FIG. 3 shows an example of changes in the level of smoke density and the like, and the above operation will be described in accordance with this. (A) in the figure is a line showing a change in level such as smoke density in the case of an actual fire. When the fire detector 1 determines that the fire determination level has been exceeded at time t1, at that time, the fire detector 2 transmits the fire time signal and the accumulation time signal including the accumulation time Ta to the fire receiver 2. In response to this, the fire receiver 2 transmits a fire confirmation signal at time t2 when the accumulation time Ta has elapsed from time t1. On the other hand, in the fire detector 1, since the fire flag remains in the ON state, this state is read and a reply signal indicating that the fire signal exceeding the fire judgment level is received is returned to the fire receiver 2. . As a result, the fire receiver 2 receives the reply signal indicating the state of the fire flag and determines that it is an actual fire.

Further, (b) in the figure is a line showing a change in the level of smoke density and the like in the case of no fire. Fire detector 1
If the fire judgment level is exceeded at time t1, then at this time, the fire time signal is transmitted to the fire receiver 2 together with the fire signal including the fire time Tb (Tb> Ta). Receiving this, the fire receiver 2 transmits a fire confirmation signal at time t3 after the accumulation time Tb has elapsed from time t1. At this time, the level of smoke density and the like has already fallen below the fire determination level, so the fire flag is in the off state, and the fire receiver 2 receives a return signal indicating the state of the fire flag, and the It can be judged that it was a fire.

Next, a fire detection system having a storage function according to claim 3 will be described. FIG. 4 is a block diagram showing an example of the configuration. The on / off type fire detector 1 includes a signal processing unit 11, a fire detection unit 12, a detection data storage unit 13, an average value calculation unit 14, and an accumulation time corresponding to the average value calculated by the average value calculation unit 14. When the smoke concentration or the temperature level exceeds the fire determination level as a result of the comparison by the accumulation time calculation unit 19, the comparison determination unit 16, and the comparison determination unit 16, a transmission that transmits a fire signal to the fire receiver 2 And a control unit 17.

On the other hand, the fire receiver 2 has a signal processing section 21.
And when the fire confirmation signal is received from the fire detector 1,
A fire determination unit 22 that determines that a fire has occurred, a transmission control unit 23, and an alarm output unit 24 are provided. The basic operation of the above configuration will be described with reference to FIG. In the fire detector 1, the smoke detector 12 constantly detects the smoke density and the environmental temperature and stores them in the detection data storage 13 (200, 201).

At the same time, each time the fire detection unit 12 detects the smoke density or the like, the comparison and judgment unit 16 compares the smoke density or the like level with the fire judgment level (20).
2) As a result, when the level of smoke density or the like exceeds the fire determination level, the average value calculation unit 14 calculates the average value of the data stored in the detection data storage unit 13 at this time (203). The storage time calculating unit 19 calculates the storage time corresponding to this average value (204).
At this time, as in the case of claim 1, the calculated accumulation time becomes a relatively short time if the average value is large, and becomes a relatively long time if the average value is small. Note that the calculation of the accumulation time may be performed by storing a calculation formula as in the case of claim 1, or by preparing a memory table corresponding to the average value in advance and reading the optimum accumulation time.

In the fire detector 1, the transmission controller 1
The fire signal is transmitted to the fire receiver 2 by 7 (20
5) At the same time, the accumulation time calculated by the accumulation time calculation unit 19 is started (206), and even after this time has elapsed, if the smoke density level exceeds the fire judgment level, the fire confirmation signal is sent. To the fire receiver 2 (20
7). The fire determination unit 22 of the fire receiver 2 receives the fire confirmation signal after receiving the fire signal, determines that an actual fire has occurred, and outputs a fire alarm from the alarm output unit 24 (208).

The operation according to FIG. 3 in this case will be described below. In the case of the actual fire shown in (a) in the figure, the fire detector 1
If the level of smoke density or the like exceeds the fire determination level at time t1, the fire signal is transmitted to the fire receiver 2 at this point. Then, when the time t2 when the accumulation time Ta has elapsed from this point is reached, the comparison result of the comparison and determination unit 16 is referred to, and if an actual fire has occurred, the level of smoke density or the like exceeds the fire determination level. Fire receiver 2
Send a fire confirmation signal to.

In the case of the non-fire shown in (b) in the figure, the fire detector 1 outputs a fire signal to the fire receiver 2 at this time if the smoke concentration level exceeds the fire judgment level at time t1. To send. Then, the accumulation time Tb (Tb> T
At time t3 when a) has elapsed, the level of smoke density or the like has already fallen below the fire determination level, so the fire confirmation signal is not transmitted to the fire receiver 2. For this reason,
Since the fire receiver 2 does not receive the fire confirmation signal,
It is not judged as a real fire.

Even in this case, the fire flag is used as in the case of claim 1, and after the accumulation times Ta and Tb have elapsed,
The fire flag may be referenced to determine whether to transmit the fire confirmation signal.

[0031]

As can be understood from the above description, according to the fire detection system having the storage function according to the first and second aspects of the present invention, the fire detector transmits the fire signal to the fire receiver together with the fire signal. Since the storage time signal is transmitted, the fire receiver can transmit a fire confirmation signal to the fire detector after the storage time has elapsed to confirm whether or not a real fire has occurred.

According to the third aspect, after the fire signal is transmitted from the fire detector to the fire receiver, if a real fire occurs after the accumulation time has elapsed, a fire confirmation signal different from the fire signal is transmitted. Therefore, the fire receiver can determine the occurrence of a fire by receiving the fire confirmation signal. Even if the fire signal is not received, it can be determined that the fire is a real fire if the fire confirmation signal is received.

As described above, according to the present invention, claims 1 to
In any of 3, apply an on-off type fire detector,
It is possible to build a fire detection system with variable storage time. Therefore, it is possible to detect an actual fire at an early stage and to prevent false alarms during non-fire.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of a fire detection system having a storage function according to claims 1 and 2 of the present invention.

FIG. 2 is a diagram showing an example of a basic operation of the fire detection system shown in FIG.

FIG. 3 is a diagram showing an example of changes in smoke density and environmental temperature level.

FIG. 4 is a block diagram showing an example of a configuration of a fire detection system having a storage function according to claim 3 of the present invention.

5 is a diagram showing an example of a basic operation of the fire detection system shown in FIG.

FIG. 6 is a system configuration diagram showing an example of the configuration of a fire detection system.

FIG. 7 is a diagram showing an example of the operation of a fire detection system having a storage function.

8A and 8B are diagrams showing an example of the operation of the fire detection system in which the accumulation time is variable.

[Explanation of Codes] 1 ... On-off type fire detector 11 ... Signal processing unit 12 ... Fire detection unit 13 ... Detection data storage unit 14 ... Average value calculation unit 15 ... Storage time Signal generation unit 16 ... Comparison determination unit 17 ... Transmission control unit 18 ... Fire flag setting unit 19 ... Accumulation time calculation unit 2 ... Fire receiver 21 ... Signal processing unit 22 ...・ Fire judgment part L ・ ・ ・ Signal lines Ta, Tb ・ ・ ・ Accumulation time

Claims (3)

[Claims] 1. A fire detection system comprising a fire receiver and an on-off type fire detector connected to the fire receiver via a signal line, wherein the on-off type fire detector comprises smoke concentration or environment. A fire detection unit that detects temperature, a detection data storage unit that stores the smoke density and temperature level data detected within a predetermined time while constantly updating the data, and a detection data storage unit that stores the data. And an average value calculation unit for calculating an average value of smoke density and temperature level data, an accumulation time signal generation unit for generating an accumulation time signal corresponding to the average value calculated by the average value calculation unit, and the fire detection unit. When the smoke density or temperature level exceeds the fire judgment level as a result of the comparison between the comparison judgment unit that compares the smoke density or temperature level detected by With a fire signal,
While the transmission control unit that transmits the accumulation time signal generated by the accumulation time signal generation unit to the fire receiver is provided, the fire receiver receives the accumulation time signal together with the fire signal from the transmission control unit of the fire detector. Is sent, the fire confirmation signal is sent to the fire detector after the accumulation time of this accumulation time signal has passed, and in response to this, the fire detector that sent the above fire signal exceeds the fire judgment level. A fire detection system having a storage function, comprising a fire determination unit that determines that a fire has occurred when a reply signal indicating that the fire signal has been received is returned. 2. The fire detector further sets a fire flag to an ON state when the accumulation time signal is transmitted together with the fire signal, and the comparison result of the comparison and determination unit indicates that the smoke concentration or the temperature level is higher than the fire determination level. It is equipped with a fire flag setting unit that holds the fire flag in the ON state until it falls, and when a fire confirmation signal is sent from the fire receiver, by reading the state of the fire flag,
The fire detection system having a storage function according to claim 1, wherein a response signal indicating that a fire signal exceeding a fire determination level is received is returned to the fire receiver. 3. A fire detection system comprising a fire receiver and an on / off type fire detector connected to the fire receiver via a signal line, wherein the on / off type fire detector is a smoke concentration or an environment. A fire detection unit that detects temperature, a detection data storage unit that stores the smoke density and temperature level data detected within a predetermined time while constantly updating the data, and a detection data storage unit that stores the data. The average value calculation unit that calculates the average value of the smoke density and temperature level data, the accumulation time calculation unit that calculates the accumulation time corresponding to the average value calculated by this average value calculation unit, and the fire detection unit that detects If the smoke density or temperature level exceeds the fire judgment level as a result of comparison between the comparison judgment unit that compares the smoke density or temperature level with the preset fire judgment level, When the accumulation time calculated by the accumulation time calculation unit has elapsed since the fire signal was transmitted to the fire receiver and the accumulation time calculated by the accumulation time calculation unit has passed, the comparison result of the comparison determination unit is the smoke concentration or the temperature level. And a transmission control unit for transmitting a fire confirmation signal to the fire receiver when the fire detection level is exceeded, the fire receiver is transmitted from the transmission control unit of the fire detector.
A fire detection system having a storage function, comprising a fire determination unit that determines that a fire has occurred when the fire confirmation signal is received.