JPH0212398A - Fire alarm device - Google Patents

Abstract

PURPOSE:To appropriately execute the status decision and the correspondence after a pre-alarm by displaying a predictive curve on a graphic display part in which an axis of ordinate and an axis of abscissa have been set to an analog level and time, respectively in a receiver, when the pre-alarm is outputted, based on a predictive operation of analog data. CONSTITUTION:A predictive operation based on analog data is executed by a control means such as a CPU, etc., contained in a receiver 8. As a result of the predictive operation, when it has been predicted to reach an accident warning level after a prescribed time, a pre-alarm 10 is outputted to a graphic display part 1, and in accordance with the output of this pre-alarm, a fire predictive curve 9 in which an axis of ordinate and an axis of abscissa have been set to an analog level and time, respectively is displayed on the graphic display part 1. Accordingly, a pre-alarm time point A and a fire alarm time point B can be understood clearly on the fire predictive curve 9. In such a way, the status decision and the corresponding counter measure after the pre-alarm can be executed appropriately.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fire alarm system that quickly determines a fire by predictive calculation based on analog detection data regarding changes in physical phenomena such as smoke and temperature associated with a fire. .

[Prior Art] As a conventional fire alarm device of this type, there is one shown in FIG. 7, for example.

In FIG. 7, 8 is a receiver, to which analog sensors 6-1 to 6-n for detecting smoke concentration, for example, are connected via a transmission line 7.

The receiver is provided with an 11th fi display section 4 and a second alarm display section 5, and when the first alarm is received, the first alarm display section 4 displays a fire display, and when the second alarm is subsequently received, the second alarm display section 5 is displayed. Fire information is displayed on the information display section 5. Furthermore, for the third and subsequent fire reports, an overflow display is performed by the overflow display section 3.

Further, the reception 11B is provided with a pre-alarm display section 2,
For example, when the smoke concentration exceeds a certain set value, a pre-alarm display is performed, or a control unit (not shown) consisting of, for example, a CPU performs predictive calculation based on analog data.
A pre-alarm display is performed based on the result of this predictive calculation. For example, when the prediction calculation results in 3 minutes before reaching the dangerous level, a pre-alarm display is performed.

As a predictive calculation method for determining a fire, for example, the method disclosed in Japanese Patent Application Laid-Open No. 62-54339 is known.

This predictive calculation method predicts temporal changes in analog data from the current point onwards based on analog data,
The time required for the predicted analog data to reach a predetermined dangerous level is calculated, and the time required for the predicted analog data to reach the dangerous level is calculated.

[Problems to be Solved by the Invention] However, in such conventional fire alarm devices, when outputting a pre-alarm, a pre-alarm display section such as an LED is simply turned on or blinked. Therefore, even if a pre-alarm was issued, it was difficult to make an appropriate decision on what to do afterwards.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a fire alarm device that performs display processing that allows appropriate judgment processing after a pre-alarm is output.

[Means for Solving the Problems] In order to achieve this object, the present invention includes an analog sensor connected to a transmission line led out from a receiver to detect smoke, temperature, etc. caused by a fire, and In a fire alarm system that determines a fire based on analog data of the receiver, the receiver includes a graphic display section with analog levels such as smoke and temperature on the vertical axis and time on the horizontal axis, and the analog sensor. A control means is provided which outputs a pre-alarm when it is predicted that the alarm level will be reached after a predetermined time by processing the analog data from the computer, and displays a fire prediction curve based on the calculation result on the graphic display section.

[Function] In the fire alarm device of the present invention having such a configuration, when a pre-alarm is issued by the receiver based on predictive calculation, the vertical axis is displayed as an analog level and the horizontal axis is displayed as an analog level on the graphic display section of the receiver. A fire prediction curve with time as the axis is displayed, and since the pre-alarm time and fire alarm time can be clearly understood on the fire prediction curve, it is possible to appropriately judge the situation after the pre-alarm and take countermeasures.

[Example] FIG. 2 is a block diagram showing one embodiment of the present invention.

In FIG. 2, 8 is a receiver, and a plurality of analog sensors 6-1 to 6 are connected to the transmission line 7 led out from the receiver t18.
-n is connected, and each of the analog sensors 6-1 to 6-n detects and outputs analog data corresponding to changes in physical phenomena associated with fire, such as smoke concentration or temperature.

Note that, for transmitting the analog data from the analog sensors 6-1 to 6-n to the receiver 8, an appropriate data transmission method such as a polling method by the receiver 8 can be adopted.

The receiver 8 is provided with a graphic display unit 1, and the graphic display unit 1 performs predictive calculations based on analog data by a control means (not shown) such as a CPU built into the receiver 8. As a result of the predictive calculation, a pre-alarm is issued when it is predicted that the alarm level will be reached after a predetermined period of time.

In response to this pre-alarm output, a fire prediction curve 9 is displayed on the graphic display unit 1, with the vertical axis representing smoke concentration and the horizontal axis representing time, as shown in FIG.

In the steady monitoring state, the graphic display section 1 only displays messages such as fire monitoring, etc., and when a warning alarm is issued based on the predictive calculation result,
For example, as shown in FIG. 3, the graphic display unit 1 includes a pre-alarm display 10, a message display 11 indicating the location of the pre-alarm, and a trend switch display 12 for switching the display of the graphic display unit 1 to a display of a fire prediction curve. When the operator touches the trend switch display 12 with his/her finger, a fire prediction curve as shown in FIG. 1 is displayed.

As such a graphic display unit 1, for example, a touch plasma display can be used.

When displaying the fire prediction curve on the graphic display section 1 shown in Fig. 1, the vertical axis shows the smoke S degree (%) detected by the analog sensor, the horizontal axis shows the time (minutes), and the The fire prediction curve 9 that is predicted and calculated when the alarm output is obtained is displayed. Regarding the display of this fire prediction curve 9, the horizontal time axis includes the pre-alarm time point A,
The alarm level is raised from pre-alarm point A, that is, the smoke density is 20.
% is shown, for example, time point B at 3 minutes invasion.

FIG. 4 is an operational flow diagram showing a fire prediction curve and display processing of the fire prediction curve performed by a control unit (not shown) such as a CPU built into the receiver 8 of FIG.

In FIG. 4, first, in the steady monitoring state, it is monitored whether the analog data indicating the smoke concentration obtained from the analog sensors 6-1 to 6-n exceeds a predetermined level.
For example, when the analog data from the analog sensor 6-1 exceeds a predetermined level, the process proceeds to step S2, where the analog data is read a plurality of times and predictive calculation is started. This predictive calculation is performed using a quadratic function approximation method as disclosed in, for example, Japanese Unexamined Patent Publication No. 62-54399. Then, the remaining time until the smoke density analog data reaches a warning level of, for example, 20% is calculated from the calculation results obtained by the predictive calculation, and when the remaining time is less than a predetermined time, for example, 3 minutes, the As shown in Figure 3, the graphic display section 1
A pre-alarm display is performed.

This pre-alarm output is determined in step S3, and the processes of steps S1 and S2 are repeated until a pre-alarm is issued, and when the pre-alarm output is determined in step S3, step 34. Proceeding to S5, a fire prediction curve is displayed. Specifically, the pre-alarm output
Pre-alarm display 10 as shown in the figure. Since a message display 11 and a trend switch display 12 are displayed, the operator can graphically display a fire prediction curve 9 as shown in FIG. 1 by pressing the trend switch 12 with his finger. At this time, the pre-alarm display 10. A message display 11 and a trend switch display 12 are also displayed on the same screen as the graphic display showing the fire prediction curve 9.

After a pre-alarm fire prediction curve is displayed in step S4 based on the detection data from a specific analog sensor, the process returns to step S2 and the same prediction calculation process is repeated for the detection data of the analog sensor.

In addition, if a pre-alarm based on the predictive calculation of the detection data of another analog sensor is issued while the fire prediction curve based on the pre-alarm regarding the analog sensor 6-1 shown in Fig. 1 is displayed, a graphic display screen will be displayed. The second pre-alarm is displayed following the first pre-alarm display. Therefore, if you want to see the fire prediction curve for the second pre-alarm, you can similarly switch to displaying the fire prediction curve by pressing the trend switch display part of the second pre-alarm. .

FIG. 5 is an explanatory diagram showing another embodiment of displaying a fire prediction curve on the graphic display unit 1 of the present invention. In this embodiment, the fire prediction curve 9 is At the same time, the analog data used for the pre-alarm output at time A is plotted as shown by white circles, and the data after the pre-alarm at time A is plotted as shown by black circles or X marks. The present invention is characterized in that the analog data actually detected is sequentially plotted and displayed over time.

According to the embodiment shown in FIG. 5, changes in analog data after the pre-alarm are plotted against the fire prediction curve 9 displayed at the pre-alarm at time A. If the rate of rise in smoke is higher than predicted curve 9, it can be seen that the smoke generated by the fire is rapid, and prompt evacuation guidance and fire extinguishing activities can be taken.

On the other hand, if the smoke density decreases after the pre-alarm, as shown by the X mark, it can be determined that the smoke is due to temporary smoke from, for example, cigarettes, and will not lead to a fire.

FIG. 6 is an explanatory diagram showing another embodiment of fire prediction curve display on the graphic display section of the present invention. In this embodiment, the fire prediction curve 9 based on the pre-alarm output is
Simultaneously with this display, the smoke density that changes from moment to moment is plotted as indicated by the circle marks, and the current smoke density is also digitally displayed on a digital display section 15 provided at the top of the screen.

In the example shown in Fig. 6, it is possible to grasp the fire prediction curve 9, changes in the actual smoke concentration, and the current smoke concentration value, making situation judgment and measures after the pre-alarm more appropriate. can be done.

In addition, although the above-mentioned embodiment took as an example the processing when smoke density was detected by an analog sensor, the same applies to an analog thermal sensor that detects temperature.

In addition, in the above embodiment, the fire prediction curve is displayed on the graphic display section by the operator's operation when the pre-alarm output is issued, but the pre-alarm output automatically displays the fire prediction curve on the graphic display section. A predicted curve may also be displayed.

Furthermore, even before a pre-alarm is issued, the fire prediction curve calculated at that time may be displayed on the graphic display section, if necessary.

[Effects of the Invention] As explained above, according to the present invention, when a pre-alarm is issued based on predictive calculation of analog data, the receiver displays a graphic display with the vertical axis representing the analog level and the horizontal axis representing time. Since the fire prediction curve is displayed on the fire prediction curve, it is possible to clearly understand the pre-alarm point and the point at which the alarm level is reached on the fire prediction curve, so it is possible to judge the situation beyond the pre-alarm and take appropriate countermeasures.

In particular, when plotting the temporal changes in actual analog data in addition to the fire prediction curve, it is possible to accurately determine whether the change is more rapid than the fire prediction curve or non-fire data is less than the fire prediction curve. Situation judgment and countermeasures after the pre-alarm will be more appropriate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a graphic display of a fire prediction curve according to the present invention; Fig. 2 is a block diagram showing an embodiment of the present invention; Fig. 3 is an explanatory diagram showing a graphic display at the time of pre-alarm. : FIG. 4 is an operation flow diagram showing the fire prediction calculation and fire prediction curve display processing performed by the receiver of FIG. 2; FIG. 5.6 is another embodiment of the graphical display of the fire prediction curve according to the present invention. Explanatory diagram showing: FIG. 7 is a block diagram of a conventional device. 1 Nigella quick display section 6-1 to 6-n: Analog sensor 7: Transmission line 8: Receiver 9: Fire prediction curve 10: Pre-alarm display 11: Message display 12: Trend SW display 15: Digital display section

Claims (1)

[Claims] 1. An analog sensor that is connected to a transmission line led out from a receiver and detects smoke, temperature, etc. caused by a fire, and a fire alarm system that determines a fire based on the analog data from the analog sensor. The graphic display section shows the analog levels of smoke, temperature, etc. on the vertical axis and the time on the horizontal axis, and the analog data from the analog sensor is processed to indicate that the alarm level will be reached after a predetermined time. A fire alarm device comprising: a control means for outputting a pre-alarm when a prediction is made and for causing the graphic display unit to display a fire prediction curve based on arithmetic processing.