JPH0962958A - Fire alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a fire at an early stage by starting a fire forecasting timer when the output of a sensor reaches a prescribed fire forecasting threshold value being on the side of a more stationary value than a prescribed fire threshold value. SOLUTION: When the sensor output of a sensor means 1 reaches the prescribed fire forecasting threshold value being on the side of a stationary value lower than the fire threshold value, a fire forecast alarming means 3 transmits a fire forecast alarm and a timer starting means 5 starts the fire forecasting timer 4. When the sensor output reaches not less than the median value between the fire forecasting threshold value and the fire threshold value, that is when the sensor output has a prescribed tendency after being over the fire forecasting threshold value, a second fire alarming means 6 transmits a second fire alarm. When the sensor output is raised furthermore after then to reach not less than the fire threshold value, a first fire alarming means 2 transmits a first fire alarm.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fire alarm device,
In particular, the present invention relates to a fire alarm device that determines a fire when two different fire determination principles are satisfied, that is, when the sensor output exceeds a fire threshold value or when the sensor output has a predetermined slope.

[0002]

2. Description of the Related Art A conventional fire alarm device has made a fire decision by comparing a fixed fire threshold value with a sensor output of a sensor means for detecting a physical quantity of a fire phenomenon that occurs with a fire.

[0003]

However, such a fire alarm device has a problem that it is difficult to detect the initial fire because the fire is not judged until the sensor output reaches the fire threshold. Then, this invention aims at obtaining the fire alarm device which can detect a fire early.

[0004]

The invention according to claim 1 is
In addition to the sensor means and the first fire alarm means, a fire forecast timer is connected between the fire forecast timer and the sensor means, and the sensor output of the sensor means is on the steady value side of a predetermined fire threshold value. Timer starting means for starting the fire forecast timer when a predetermined fire forecast threshold is reached;
When connected to the sensor means and the fire forecast timer, when the sensor output reaches a predetermined threshold value between the fire forecast threshold value and the fire threshold value at a predetermined time after the fire forecast timer is activated Alternatively, it is provided with a second fire alarm means for issuing a second fire alarm when the time when the sensor output reaches the threshold value is within the predetermined time of the fire forecast timer.

According to a second aspect of the present invention, the first fire alarm is issued when the sensor output is equal to or higher than the fire threshold even after a predetermined accumulation time has elapsed from the time when the sensor output of the sensor means reaches or exceeds the predetermined fire threshold. A first fire alarm means for transmitting
A second fire alarm is issued when the sensor output is equal to or more than a predetermined threshold value between the fire prediction threshold value and the fire threshold value, even after a lapse of a time equal to a sum of a predetermined time period and the accumulation time from the time when the fire prediction timer is activated. It is provided with a second fire alarm means for transmitting.

The invention according to claim 3 is based on at least two different fire discrimination principles, which are connected to the sensor means for sampling the physical quantity of the fire phenomenon that accompanies the fire to generate a sensor output. A fire judging means for judging a fire from the sensor output is provided. According to a fourth aspect of the present invention, when the sensor output of the sensor means exceeds a predetermined fire threshold value, it is determined that a fire occurs and a first fire alarm is issued, and the sensor output has a predetermined inclination. When it has, it has a 2nd fire judging means which judges that it is a fire and issues a 2nd fire alarm.

The invention according to claim 5 is connected between the sensor means and the fire forecast timer, and when the fire forecast timer is activated, when the sensor output of the sensor means falls below the fire forecast threshold, It is provided with a timer stopping means for stopping the fire forecast timer. Claim 6
In addition to stopping the operation of the fire forecast timer, the invention according to (1) is provided with a timer stop means for initializing or subtracting the operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. This fire alarm device basically periodically samples the physical quantity of a fire phenomenon that occurs with a fire, such as smoke, heat, light rays (ultraviolet rays, visible light, infrared rays), gas, odor, water vapor, pressure, and sound. To generate a sensor output, eg a smoke sensor (scattered light type, dimmed type,
(Ionization type), heat sensor, flame sensor, image camera, gas sensor, odor sensor, humidity sensor, pressure sensor, sound sensor, etc. (not shown).

The fire alarm device is further connected to the sensor means 1, and the first fire alarm means 2 for issuing a first fire alarm when the sensor output rises and reaches a predetermined fire threshold or more, and the sensor means 1. And a fire forecast warning means 3 for issuing a fire forecast warning when the sensor output is lower than the fire threshold, that is, when it reaches or exceeds a predetermined fire forecast threshold on the steady value side.

In addition, the fire alarm device is connected between the fire forecast timer 4 and the fire forecast timer 4 and the sensor means 1, and activates the fire forecast timer 4 when the sensor output reaches the fire forecast threshold value. The timer output means 5 is connected to the sensor means 1 and the fire forecast timer 4, and the sensor output has a predetermined threshold value between the fire forecast threshold value and the fire threshold value when a predetermined time has elapsed from the time when the fire forecast timer 4 was started. That is, it is provided with the second fire alarm means 6 for issuing the second fire alarm when the intermediate threshold value or more is reached or when the sensor output has a predetermined inclination. In other words, the second fire alarm means 6 is the second fire alarming means 6 when the sensor output reaches the above-mentioned intermediate threshold value within the predetermined time of the fire forecast timer 4.
Send a fire alarm.

The fire alarm device is further connected between the sensor means 1 and the fire forecast timer 4, and the fire forecast timer 4
The timer stop means 7 is provided for stopping the fire forecast timer 4 when the sensor output becomes less than the fire forecast threshold value in a state where is activated. In addition to stopping the operation of the fire forecast timer 4, the timer stopping means 7 causes the fire forecast timer 4 to be initialized or subtracted.

The fire alarm device is composed of a fire detector and a fire receiver, and it is possible to judge whether or not there is a fire by either the fire detector or the fire receiver. When making a fire judgment on the fire detector side In this case, all of the sensor means 1 to the timer stopping means 7 in FIG. 1 may be provided in the fire detector. In this case, the first fire alarm means 2 and the second fire alarm means 6 are connected to a fire receiver (not shown), and when a fire is judged, a fire alarm (fire signal) is transmitted to the fire receiver. When making a fire decision on the fire receiver side, an A / D converter and a signal transmission circuit (not shown) are connected in the subsequent stage of the sensor means 1, only these are provided in the fire detector, and the fire receiver polls. A sensor output is received by the etc. and a fire is judged based on it. The fire detector outputs different code signals for the first fire alarm and the second fire alarm so that the fire receiver can determine which fire alarm.

The fire alarm system of FIG. 1 is constructed as described above, and various examples of its operation 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 when the fire alarm device is of the non-accumulation type. When the sensor output reaches the fire forecast threshold value at time T1, the fire forecast warning means 3 issues a fire forecast warning, and the timer starting means 5
Activates the fire forecast timer 4.

When the sensor output reaches the intermediate threshold value A or more between the fire forecast threshold value and the higher fire threshold value at time point T2 after the elapse of a predetermined time b after the fire prediction timer 4 is activated at time point T1. , Or when the sensor output reaches the intermediate threshold value A within the predetermined time b, in other words,
If the sensor output has a predetermined inclination after exceeding the fire forecast threshold value, the second fire alarm means 6 issues a second fire alarm. After that, when the sensor output further rises and reaches the fire threshold value or more at the time point T3, the first fire alarm means 2 sets
Send a fire alarm. When the sensor output rises very slowly and does not reach the intermediate threshold value A within the predetermined time b and then reaches the fire threshold value, only the first fire alarm means 2 gives a fire alarm.

Next, the operation of the fire alarm device (non-accumulation system) of the present invention will be described with reference to the flowchart of FIG.
This fire alarm device is equipped with MPU, ROM, RAM, I /
When it is configured by a microcomputer such as O and an interface, first, necessary components are initialized in step S1. Next, in step S2, the sensor means 1 produces the sensor output by periodically sampling, for example, every 3 seconds the above-mentioned physical quantity generated by the fire. In step S3, it is determined whether or not this sensor output is equal to or higher than the fire forecast threshold value. If the fire forecast timer 4 is not activated, the timer activation means 5 activates the fire forecast timer 4 in step S5, or if the fire forecast timer 4 is already activated, that is the case.
Proceed to step S6.

If the result of the determination in step S3 is not equal to or greater than the fire forecast threshold value, the process proceeds to step S7 to determine whether or not the fire forecast timer 4 has been started, and if it has been started, the timer stop means 7 fires in step S8. After stopping the forecast timer 4, or if it is not running,
The program continues by returning to step S2.

Further, in step S6, it is determined whether or not the sensor output is less than the fire threshold value. If it is not less than the fire threshold value, that is, if it exceeds the fire threshold value, the process proceeds to step S9 and the first step is performed.
The fire alarm means 2 sends a first fire alarm to, for example, a fire receiver. If the sensor output is less than the fire threshold, step S
At 10, it is determined whether or not the sensor output is at or above the intermediate threshold value A, and at step S11, it is determined whether or not it is within a predetermined time b after starting the fire forecast timer 4, and if both are yes, the process proceeds to step S12 and the second. The second fire alarm is transmitted to the fire alarm means 6, for example, the fire receiver in a signal form different from that of the first fire alarm.

If the determination result in step S10 is not A or more, and the determination result in step S11 is not within b, the program returns to step S2 to continue. The fire usage timer 4 may be stopped and cleared when the fire forecast timer 4 has passed the predetermined time b without the sensor output reaching the intermediate threshold value A.

FIG. 4 shows an operation example in which the sensor output of the sensor means 1 simply rises as the fire progresses, when the fire alarm device is a storage system having a storage time, as in FIG. When the sensor output reaches the fire forecast threshold value at time T1, the fire forecast warning means 3 notifies the fire receiver or the like of the first
A fire forecast alarm is transmitted in a signal form different from the fire alert and the second fire alert, and the timer activation means 5 activates the fire forecast timer 4.

The sensor output reaches the intermediate threshold value A at a time T2 after a lapse of a predetermined time b after the fire forecast timer 4 is started at the time T1, and a predetermined accumulation time for the second fire alarm means 6 from the time T2. When the sensor output reaches the intermediate threshold value A or more after t2, the second fire alarm means 6
Issues a second fire alarm as in the above-described embodiment. After that, the sensor output further rises, reaches the fire threshold value at time T3, and if the sensor output exceeds the fire threshold value after the accumulation time t1 for the first fire alarm means 2 has elapsed, the first fire alarm means 2 has been described above. The first fire alarm is issued as in the case.

Although the above-mentioned respective accumulation times t1 and t2 have been described as being constant, they may be different from each other or may be variable. In more detail, if the storage time is variable, the fire forecast timer 4
It is calculated from the degree of change in the sensor output (difference from the fire forecast threshold value) after a lapse of a predetermined time b after the activation. That is, if the difference between the sensor output and the fire forecast threshold is large, the accumulation time is lengthened, but conversely, if the difference is small, the accumulation time is shortened.

FIG. 5 shows that the sensor output is once the fire forecast threshold,
An example of an operation in which the value becomes less than the fire forecast threshold value after the intermediate threshold value A and the fire threshold value are exceeded and becomes the fire threshold value or more again, and when the sensor output increases and reaches the fire forecast threshold value at time T1 as described above, the fire forecast value is set. Although the timer 4 is activated and continues to be activated even after the time points T2 and T3, when the sensor output becomes less than the fire forecast threshold value at the time point T4, the timer stopping means 7 is energized to stop the operation of the fire forecast timer 4 and Initialize (see thick line). After that, the sensor output is time T
When the fire forecast threshold is again reached at 5, the fire forecast timer 4 is restarted and continues to operate after time T6.

Further, at time T4, the fire forecast timer 4 can be stopped and the timer value can be subtracted to a value having a lower limit value of 0 (see the one-dot chain line), after which the sensor output is again at time T5. When the fire forecast threshold is reached, the fire forecast timer 4 is restarted and continues to operate after time T6.

The fire forecast timer 4 is originally used to obtain the slope of the sensor output. However, the fire forecast timer 4 is kept running while the sensor output exceeds the fire forecast threshold value, and the timer value is kept. By displaying on the fire receiver, the operator can judge that there is a possibility of contamination when the sensor output has exceeded the fire forecast threshold for a long time. In addition, in the above-described embodiment, as will be described later, in order to grasp the progress situation of the fire, the fire alarm is issued by two alarm means, and the first fire alarm is issued after the second fire alarm is issued. As described above, once the second fire alarm is issued, it is not necessary to issue the first fire alarm thereafter, and one alarm means may be used. In this case, the same signal is transmitted. It can be in the form.

FIG. 6 is a block diagram showing an example of an actual embodiment of a fire alarm device which judges a fire when two different fire discrimination principles, that is, when the sensor output exceeds a fire threshold and when the sensor output has a predetermined inclination. is there. This fire alarm device
In addition to the sensor means 1, the fire forecast timer 4, the timer starting means 5 and the timer stopping means 7 described in detail with reference to FIG. 1, when the sensor output is increased and exceeds a predetermined fire threshold value. First fire judging means 8 which judges that there is a fire and issues a first fire alarm, for example the first fire in FIG.
A second fire judging means 9 which is connected to the fire warning means, the sensor means 1 and the fire forecast timer 4 and which judges that a fire occurs and outputs a second fire warning when the sensor output rises and has a predetermined inclination, for example, FIG. No. 1 second fire alarm means, and these first
It is connected to the fire judging means 8 and the second fire judging means 9, and is provided with a means 10 for receiving and displaying or notifying the first fire alarm and / or the second fire alarm, for example, a fire receiver.

In this fire alarm device, when the display or notification means 10 receives the first fire alarm from the first fire determination means 8 shortly after receiving the second fire alarm from the second fire determination means 9, it indicates a fire. It judges that the progress is fairly fast and displays "Sensor output steep slope" on the display (not shown), or causes a speaker (not shown) to notify the same by voice. Also, the display or notification means 10
When the second fire alarm is received but the first fire alarm is not received thereafter, the sensor output rises rapidly, but eventually it does not reach the fire threshold, so this is judged to be a false alarm of cigarettes, etc. Do nothing or display or notify that "fire simulation has occurred". Further, display or notification means 10
When the first fire alarm is suddenly received without receiving the second fire alarm, it judges that the progress of the fire is a smoldering fire and displays or informs "Slow sensor output gradient".

[0027]

As described in detail above, the fire alarm device according to the present invention has a fire alarm device that is not judged as a fire unless the sensor output reaches the fire threshold value.
Two different fire discrimination principles, that is, if the sensor output exceeds the fire threshold value, or if the sensor output has a predetermined slope, it is judged as a fire, and if the sensor output has a predetermined slope, that is, the sensor output is If the temperature rises to a certain extent within the predetermined time, it is determined that the fire has occurred even if the fire threshold has not been reached, so that the fire can be detected early. Also, instead of simply outputting a fire alarm,
Since it is also known which fire determination means has determined the fire, the operator of the fire receiver, such as the manager, can also know what kind of fire the fire is, that is, whether the progress is fast or slow. Furthermore, if a fire judgment is made by combining fire judgments based on different fire judgment principles, the fire alarm will know if the sensor output is a pseudo-fire phenomenon such as cigarette smoke, which has a sharp rising tendency. It will be possible

[Brief description of 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.

FIG. 3 is a flowchart for explaining the operation of the fire alarm device shown in FIG.

FIG. 4 is a graph showing another operation example of the fire alarm device shown in FIG.

FIG. 5 is a graph showing still another operation example of the fire alarm device shown in FIG.

FIG. 6 is a block diagram showing another embodiment of the fire alarm device according to the present invention.

[Explanation of symbols]

 1 Sensor Means 2 First Fire Warning Means 3 Fire Forecast Warning Means 4 Fire Forecast Timers 5 Timer Starting Means 6 Second Fire Warning Means 7 Timer Stopping Means 8 First Fire Judging Means 9 Second Fire Judging Means 10 Display or Notification Means

Claims (6)

[Claims] 1. A sensor means for sampling a physical quantity of a fire phenomenon that occurs with a fire to generate a sensor output,
A fire alarm device comprising: a first fire alarm means connected to the sensor means; and a first fire alarm means for issuing a first fire alarm when the sensor output reaches or exceeds a predetermined fire threshold value. Timer starting means connected between the sensor means and activating the fire forecast timer when the sensor output reaches a predetermined fire forecast threshold value which is on the steady value side of the fire threshold value, the sensor means and the fire. It is connected to a forecast timer, and when the sensor output reaches a predetermined threshold value between the fire forecast threshold value and the fire threshold value or more at a predetermined time after the fire forecast timer is activated, or when the sensor output value is A second fire alarm means for issuing a second fire alarm when the time when the threshold is reached is within the predetermined time of the fire forecast timer. Fire alarm system and. 2. The first fire alarm means outputs the first fire alarm when the sensor output is equal to or higher than the fire threshold value even after a predetermined accumulation time has elapsed since the time when the sensor output reached the fire threshold value. And the second fire alarm means outputs a signal when the sensor output is equal to or greater than the predetermined threshold value, even after a time equal to the sum of the predetermined time and the accumulation time from the time when the fire forecast timer is activated. The fire alarm device according to claim 1, wherein the second fire alarm is transmitted. 3. A sensor means for sampling a physical quantity of a fire phenomenon that occurs with a fire to generate a sensor output,
A fire judging means which is connected to this sensor means and judges from the sensor output that there is a fire based on at least two different fire judging principles is provided. A fire alarm device characterized by giving an alarm. 4. The first fire determination means for determining that there is a fire and issuing a first fire alarm when the sensor output exceeds a predetermined fire threshold value, and the sensor output has a predetermined slope. The fire alarm device according to claim 3, further comprising: a second fire determination means that determines that a fire occurs and issues a second fire alarm. 5. The fire forecast timer is stopped when the sensor output becomes less than the fire forecast threshold value while being connected between the sensor means and the fire forecast timer and the fire forecast timer is activated. The fire alarm device according to any one of claims 1 to 4, further comprising timer stop means. 6. The fire alarm device according to claim 5, wherein the timer stop means stops the operation of the fire forecast timer, and also initializes or subtracts the operation of the timer.