JP3711163B2 - Fire alarm - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention belongs to the field of fire alarms.
[0002]
[Prior art]
Sensor means for generating a sensor output by sampling a physical quantity of a fire phenomenon that occurs with a fire, a fire alarm sending means for sending a fire alarm when the sensor output of the sensor means exceeds a predetermined fire threshold, and a sensor means In the case of detecting a normal pattern of fire in a conventional fire alarm device equipped with a fire forecast alarm sending means for sending a fire forecast alarm when the sensor output exceeds a predetermined fire forecast threshold value on the steady value side of the fire threshold value In addition, it took only a short time (for example, several minutes at most) for the sensor output to rise from the fire prediction threshold to the fire threshold. However, if the light emitting part or light receiving part of the sensor means is soiled, the sensor output gradually increases even though it is not a fire, and reaches the fire threshold from the fire prediction threshold for a very long time (for example, more than one day). .
[0003]
[Problems to be solved by the invention]
As described above, in the conventional fire alarm device, even when the fire forecast threshold is reached due to the increase in sensor output due to contamination, the fire forecast alarm is transmitted, which not only hinders the fire function, but also the sensor output is the fire threshold. The fire forecast alarm continued to be output from the display unit or the sound unit of the fire receiver for more than a day until it reached.
Therefore, the present invention stops the transmission of the fire forecast warning due to contamination and transmits the contamination warning after a predetermined time has passed since the transmission of the fire prediction warning, thereby preventing the influence of the contamination on the fire function and notifying the non-fire report due to the contamination. The aim is to obtain a fire alarm device that can be reduced.
[0004]
[Means for Solving the Problems]
The present invention provides sensor means for generating a sensor output by sampling a physical quantity of a fire phenomenon that occurs with a fire, and a fire alarm transmitting means for issuing a fire alarm when the sensor output of the sensor means exceeds a predetermined fire threshold. A fire alarm device comprising: a first fire forecast alarm sending means for sending a first fire forecast alarm when a sensor output of the sensor means exceeds a predetermined first fire forecast threshold value on a steady value side of the fire threshold value. In this case, when the sensor output of the sensor means reaches the first fire prediction threshold value, a fire prediction threshold value is set between the first fire prediction threshold value and the fire threshold value immediately or after a predetermined time elapses. and fire forecast threshold changing means for changing the fire forecasts threshold, a timer for fire forecast threshold, at the same time the fire forecast threshold and modifying a fire forecast threshold by the fire forecast threshold changing means A timer starting means for starting the use timer, the fire forecast threshold timer is those with fouling alarm transmitter means for transmitting a fouling alarm after a predetermined time elapsed since the start.
A second fire forecast alarm sending means for sending a second fire forecast alarm when the sensor output of the sensor means exceeds the second fire forecast threshold; and the sensor output of the sensor means exceeds the first fire forecast threshold. And a first fire forecast alarm stop means for stopping the transmission of the first fire forecast alarm by the first fire forecast alarm sending means when the second fire forecast threshold is not reached after a predetermined time has elapsed since the last time. It is.
Further, when the fire forecast threshold is the second fire forecast threshold, when the sensor output of the sensor means becomes less than the first fire forecast threshold, the fire forecast threshold is changed from the second fire forecast threshold. Fire forecast threshold return means for returning to the first fire forecast threshold, and timer stop means for stopping the fire forecast threshold timer simultaneously with the return of the fire forecast threshold by the fire forecast threshold return means. .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.
FIG. 1 is a block diagram showing one embodiment of a fire alarm device according to the present invention. As with conventional devices, this fire alarm device periodically generates physical quantities such as smoke, heat, light (ultraviolet rays, visible light, infrared rays), gas, odor, water vapor, pressure, and sound. Sensor means 1 that generates a sensor output by sampling into at least one of smoke sensor, heat sensor, flame sensor, image camera, gas sensor, odor sensor, humidity sensor, pressure sensor, sound sensor, etc. (not shown) Yes.
[0009]
The fire alarm device is further connected to the sensor means 1 and connected to the sensor means 1 and the fire alarm transmission means 2 for transmitting a fire alarm when the sensor output rises and exceeds a predetermined fire threshold value. First fire forecast warning sending means 3 for sending a first fire forecast warning when a value exceeds a predetermined first fire forecast threshold (given from a fire forecast threshold return means described later) that is on the steady value side of the fire threshold And.
[0010]
In addition, the fire alarm device is connected to the sensor means 1 and when the sensor output reaches the first fire forecast threshold value, the fire forecast threshold value is changed from the first fire forecast threshold value to the fire threshold value immediately or after a predetermined time has elapsed. A fire prediction threshold value changing means 4 for changing to a predetermined second fire prediction threshold value between, a fire prediction threshold value timer 5, a fire prediction threshold value timer 5 and the fire prediction threshold value changing means 4, Simultaneously with the change of the fire forecast threshold by the fire forecast threshold changing means 4, the timer start means 6 for starting the fire forecast threshold timer 5 and the fire forecast threshold timer 5 are connected, and the fire forecast threshold timer 5 is started. And a fouling alarm transmitting means 7 for transmitting a fouling alarm after elapse of a predetermined time b, for example, 24 hours or more as described in the prior art.
[0011]
The fire alarm device is further connected to the sensor means 1, and when the sensor output exceeds the second fire forecast threshold value given from the fire forecast threshold value changing means 4, a second fire forecast alarm signal is sent. It is connected between the means 8, the sensor means 1 and the first fire forecast alarm sending means 3, and reaches the second fire forecast threshold after a predetermined time a, for example 10 seconds from when the sensor output exceeds the first fire forecast threshold. A first fire forecast alarm stop means 9 for stopping the transmission of the first fire forecast alarm by the first fire forecast alarm send means 3 when not, a sensor means 1 and a second fire forecast alarm send means 8 are connected between the sensor The second fire that stops the transmission of the second fire forecast warning by the second fire forecast warning sending means 8 when the output reaches the fire threshold after exceeding the second fire forecast threshold or becomes less than the second fire forecast threshold. Forecast police And a stopping means 10.
[0012]
The fire alarm device is further connected to the sensor means 1, and when the fire forecast threshold is the second fire forecast threshold, the second fire forecast threshold is set when the sensor output becomes less than the first fire forecast threshold. A fire prediction threshold value return means 11 for returning from the prediction threshold value to the first fire prediction threshold value is connected between the fire prediction threshold value return means 11 and the fire prediction threshold value timer 5. Timer stop means 12 for stopping the fire forecast threshold timer 5 simultaneously with the return is provided.
Note that the first fire forecast warning transmission means 3 and the second fire forecast warning transmission means 8 are described separately for convenience of explanation. These are, for example, one comparator that compares a predetermined reference value with a sensor output. In this case, the first fire forecast threshold value is normally set as the predetermined reference value. However, when the sensor output exceeds the first fire forecast threshold value, the second fire forecast threshold value is set. A forecast threshold is set.
[0013]
The fire alarm device is further connected to a storage area 13 in which an eigenvalue, for example, address of the sensor means 1 is registered, and is connected between the storage area 13 and the sensor means 1, and when the sensor output reaches the first fire forecast threshold value. The eigenvalue registration means 14 for registering the eigenvalue described above in the storage area 13 is connected between the storage area 13 and the sensor means 1 and is registered in the storage area 13 when the sensor output becomes less than the first fire forecast threshold. And eigenvalue erasing means 15 for erasing the eigenvalue.
[0014]
Whether or not a fire has occurred may be determined by either a fire detector or a fire receiver constituting the fire alarm device. In other words, when making a fire judgment with the fire detector, the fire alarm sending means 2, the first fire forecast warning sending means 3, the contamination warning sending means 7 and the second fire forecast warning sending means 8 in FIG. Other than that, it can be installed on the fire detector side. However, in this case, the fire detector is provided with a signal sending means 8 instead of the fire alarm sending means 2, the first fire forecast warning sending means 3, the contamination warning sending means 7 and the second fire forecast warning sending means, for example, a fire When an alarm is to be output, a signal is output to the fire receiver through the signal transmission means.
Further, when making a fire determination with a fire receiver, only the sensor means 1 of FIG. 1 is provided on the fire detector side, and the others are provided on the fire receiver. In this case, an A / D converter and a signal sending means connected to the fire receiver are provided after the sensor means 1, and the sensor output of the fire detector is output to the fire receiver, for example, by polling or the like. To do.
Note that the storage area 13 to the specific deletion means 15 are necessary only when a fire determination is made on the fire receiver side. In other words, when a fire is judged by a fire receiver, the sensor outputs of a plurality of fire detectors are monitored, and the first fire forecast threshold or the second fire forecast threshold is set as a forecast threshold for each detector, that is, its eigenvalue (address). This is because it is necessary to set.
[0015]
The fire alarm device of FIG. 1 is configured as described above, and various operation examples of the case where a fire determination is made by a fire receiver will be described in detail below with reference to FIGS.
FIG. 2 shows an operation example in which the sensor output of the sensor means 1 simply rises as the fire progresses. First, it is assumed that a predetermined first fire forecast threshold value is given from the fire forecast threshold return means 11 to the first fire forecast alarm sending means 3 and the second fire forecast alarm sending means 8. As indicated by the solid line, when the sensor output from the sensor means 1 rises and reaches the first fire forecast threshold at the time t1, the eigenvalue registration means 14 registers the eigenvalue of the sensor means 1 such as an address in the storage area 13, and 1 fire forecast warning sending means 3 sends a single or continuous first fire forecast warning, and fire forecast threshold changing means 4 is immediately (single first fire forecast warning) or after a predetermined time has passed (continuing first 1 fire forecast alarm), instead of the first fire forecast threshold from the fire forecast threshold return means 11, a predetermined second fire forecast threshold is given to the first fire forecast alarm sending means 3 and the second fire forecast alarm sending means 8, At the same time, the fire alarm threshold timer 5 is started by the timer starting means 6.
[0016]
When the second fire prediction threshold is not reached after a predetermined time a, for example, 10 seconds has elapsed from the time point t1 when the sensor output reaches the first fire prediction threshold, the first fire prediction warning stop means 9 is the first fire prediction warning transmission means 3. The transmission of the first fire forecast alarm by is stopped, thereby preventing the first fire forecast alarm from being output continuously.
[0017]
Thereafter, when the sensor output further rises and reaches the second fire forecast threshold value at time t2, the second fire forecast alarm sending means 8 sends the second fire forecast warning, and the sensor output is set to a predetermined fire at time t3. When the threshold value is exceeded, the fire alarm transmission means 2 transmits a fire alarm. At the same time, the second fire forecast alarm stop means 10 stops the second fire forecast alarm sending means 8 from sending the second fire forecast alarm. At this time, the fire forecast threshold timer 5 is also stopped.
[0018]
However, when the sensor output exceeds the second fire forecast threshold value at the time point t2, for example, when the sensor output becomes less than the second fire forecast threshold value at the time point t4, as shown by a one-dot chain line, the second fire forecast alarm stop means 10 The transmission of the second fire prediction alarm by the fire prediction alarm transmission means 8 is stopped.
[0019]
FIG. 3 shows an example of operation in which the sensor output exceeds the first fire forecast threshold but does not reach the second fire forecast threshold as in the case of contamination of the optical unit, and the sensor output rises as shown by the solid line at time t1. When the first fire forecast threshold is reached, the eigenvalue registration means 15 registers the eigenvalue of the sensor means 1 in the storage area 13 as described above, and the first fire forecast alarm sending means 3 sends the first fire forecast alarm, The fire forecast threshold value changing means 4 changes the first fire forecast threshold value to the second fire forecast threshold value, and the timer starting means 6 starts the timer 5. Since the sensor output has not yet reached the second fire prediction threshold even after the elapse of the predetermined time a from the time t1, the first fire prediction alarm stop means 9 stops the transmission of the first fire prediction alarm by the first fire prediction alarm transmission means 3. Let
[0020]
Thereafter, when the fire forecast threshold timer 5 is timed up without reaching the second fire forecast threshold value, that is, when the predetermined time b, for example, 24 hours or more has elapsed from the time point t1, the contamination warning transmission means 7 Sends a fouling alert to notify that the sensor means 1 is fouled, not a fire, along with the eigenvalues in the storage area 13.
[0021]
In the state where the sensor output exceeds the first fire forecast threshold at the time t1 and the fire forecast threshold is the second fire forecast threshold, the first fire forecast at the time t6, for example, as indicated by the one-dot chain line in FIG. When it becomes less than the threshold, the fire forecast threshold return means 11 returns the second fire forecast threshold given to the first fire forecast alarm sending means 3 and the second fire forecast alarm sending means 8 to the first fire forecast threshold. At the same time, the timer stop means 12 stops the counting of the fire forecast threshold timer 5, and the eigenvalue deleting means 15 deletes the eigenvalue registered in the storage area 13.
[0022]
Next, the operation of the fire alarm device of the present invention will be described with reference to the flowcharts of FIGS. When this fire alarm device is constituted by a microcomputer such as an MPU, ROM, RAM, I / O, interface, etc., initial setting is first made on necessary parts in step S1 of FIG. Next, in step S2, the sensor means 1 generates the sensor output by periodically sampling, for example, every 3 seconds, the above-described fire phenomenon that occurs in association with a fire, for example, the physical quantity of smoke. In step S3, it is determined whether or not the sensor output is equal to or greater than the first fire prediction threshold. If the sensor output is equal to or greater than the first fire prediction threshold, the process proceeds to step S4 to determine whether or not the fire prediction threshold timer 5 is activated. If the fire prediction threshold timer 5 is not activated, the timer activation means 6 activates the fire prediction threshold timer 5 in step S5, and then the process proceeds to step S6. E.g., the address is registered in the storage area 13, and the process further proceeds to step S7, where the first fire forecast alarm transmission means 3 transmits the first fire forecast alarm, and further proceeds to step S8 to change the fire forecast threshold value 4 changes the fire forecast threshold from the first fire forecast threshold to the second fire forecast threshold.
[0023]
If the fire prediction threshold timer 5 is activated in step S4, it is determined in step S9 whether or not a predetermined time a has elapsed from the time t1 when the sensor output reaches the first fire prediction threshold. If there is, the first fire forecast warning stop means 9 stops sending the first fire forecast alarm sending means 3 by the first fire forecast warning sending means 3 in step S10. Proceed to S15.
[0024]
If the sensor output is determined to be less than the first fire forecast threshold value after passing through step S3 at least once and coming again to step S3, the first fire forecast alarm stopping means 9 in step S11 causes the first fire forecast warning stopping means 9 to The alarm is stopped, the timer stop means 12 stops the fire forecast threshold timer 5 in step S12, the fire forecast threshold return means 11 returns the second fire forecast threshold to the first fire forecast threshold in step S13, and step After the eigenvalue deleting means 15 deletes the eigenvalue registered in the storage area 13 in S14, the program returns to step S2.
[0025]
In step S15, it is determined whether or not the sensor output is equal to or greater than the second fire forecast threshold. If the sensor output is equal to or greater than the second fire forecast threshold, the process proceeds to step S16 in FIG. If the second fire forecast warning is not sent, the second fire forecast warning sending means 8 sends the second fire forecast warning in step S17, or the second fire forecast warning is already sent. In that case, the process proceeds to step S18.
[0026]
In step S18, it is determined whether or not the sensor output is equal to or greater than the fire threshold value. If it is equal to or greater than the fire threshold value, the second fire forecast alarm stop unit 10 transmits the second fire forecast alarm signal by the second fire forecast alarm transmission unit 8 in step S19. The fire alarm transmission means 2 transmits a fire alarm in step S20. However, if it is determined in step S18 that the sensor output is less than the fire threshold, the program proceeds to step S23 described later.
[0027]
If the determination result in step S15 is less than the second fire forecast threshold, the program proceeds to step S21 to determine whether or not a second fire forecast alarm has been transmitted. If the second fire forecast alarm has been transmitted, the program proceeds to step S22. After the second fire forecast warning stopping means 10 stops sending the second fire forecast warning, if the second fire forecast warning is not sent, the sensor output in step S18 is less than the fire threshold. If so, the process proceeds to step S23. In this step S23, it is determined whether or not a predetermined time b, for example, 24 hours or more has elapsed since the fire prediction threshold timer 5 was started at time t1, and if it has elapsed, the contamination alarm transmitting means 7 issues a contamination alarm in step S24. If it does not elapse, the process returns to step S2.
[0028]
The fire forecast threshold changing means 4 immediately changes from the first fire forecast threshold to the second fire forecast threshold when the sensor output reaches the first fire forecast threshold, and the first fire forecast alarm sending means 3 Although the case where the first fire forecast alarm is transmitted for a predetermined time has been described, this change may be after the predetermined time has elapsed, and in this case, it is not particularly necessary to transmit the first fire forecast alarm for a predetermined time. . Since the threshold value is changed after a predetermined time, the first fire forecast alarm is issued until the change is made, that is, while the sensor output exceeds the first fire forecast threshold value. When the threshold value is changed to the second fire forecast threshold value, if the sensor output has not yet reached the second fire forecast threshold value, the alarm is stopped, and as a result, the forecast alarm is transmitted for a predetermined time. It is.
When the sensor output exceeds the first fire forecast threshold and the fire forecast threshold timer 5 is started, the timer value (elapsed time after the sensor output exceeds the first fire forecast threshold) is displayed on the fire receiver. You may make it display on a part. In this way, the operator of the fire receiver can determine whether the cause of the increase in the sensor output is a fire or the contamination of the fire detector based on the magnitude of the timer value.
[0029]
【The invention's effect】
In the present invention, when the sensor output rises due to contamination of the light emitting part and the light receiving part of the sensor means and reaches the first fire forecast threshold value, the first fire forecast threshold value is changed to the second fire forecast threshold value on the abnormal side. To stop sending fire forecast warnings due to pollution, and to send pollution warnings after a predetermined period of time, such as 24 hours or more from sending fire forecast warnings, to prevent the impact of fire on fire functions and The effect that the fire report can be reduced is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing one embodiment of a fire alarm device according to the present invention.
FIG. 2 is a graph showing an operation example of the fire alarm device shown in FIG. 1;
FIG. 3 is a graph showing another operation example of the fire alarm device.
FIG. 4 is a part of a flowchart for explaining the operation of the fire alarm device.
FIG. 5 is the remaining part of the flowchart for explaining the operation of the fire alarm device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensor means 2 Fire alarm transmission means 3 First fire forecast alarm transmission means 4 Fire prediction threshold change means 5 Fire prediction threshold timer 6 Timer start means 7 Contamination alarm transmission means 8 Second fire forecast alarm transmission means 9 First fire forecast Alarm stop means 10 Second fire forecast alarm stop means 11 Fire forecast threshold return means 12 Timer stop means 13 Storage area 14 Eigen value registration means 15 Eigen value deletion means

Claims (3)

Sensor means for generating a sensor output by sampling a physical quantity of a fire phenomenon that occurs due to a fire, fire alarm sending means for sending a fire alarm when the sensor output of the sensor means exceeds a predetermined fire threshold, and the sensor means A fire alarm device comprising: a first fire forecast alarm sending means for sending a first fire forecast alarm when a sensor output of the first exceeds a predetermined first fire forecast threshold value on a steady value side of the fire threshold value. When the sensor output of the means reaches the first fire prediction threshold, immediately or after a predetermined time has elapsed, the fire prediction threshold is changed from the first fire prediction threshold to a predetermined second fire prediction threshold that is between this and the fire threshold. and fire forecast threshold changing means for changing, a timer for fire forecast threshold, simultaneously the fire forecast threshold timer and changing fire forecast threshold by the fire forecast threshold changing means A timer starting means for moving, the fire alarm device, characterized in that the fire forecast threshold timer is provided with a fouling alarm transmitter means for transmitting a fouling alarm after a predetermined time elapsed since the start. When the sensor output of the sensor means exceeds the second fire forecast threshold, a second fire forecast alarm sending means for sending a second fire forecast alarm; and when the sensor output of the sensor means exceeds the first fire forecast threshold And a first fire forecast alarm stop means for stopping the transmission of the first fire forecast alarm by the first fire forecast alarm sending means when the second fire forecast threshold value is not reached after a predetermined time has elapsed. The fire alarm device according to claim 1 . When the fire forecast threshold is the second fire forecast threshold, when the sensor output of the sensor means becomes less than the first fire forecast threshold, the fire forecast threshold is changed from the second fire forecast threshold to the second fire forecast threshold. 1. Fire forecast threshold return means for returning to 1 fire forecast threshold, and timer stop means for stopping the fire forecast threshold timer simultaneously with the return of the fire forecast threshold by the fire forecast threshold return means The fire alarm device according to claim 1 or 2 .

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