JPS62222389A - Fire judgement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a fire determination method in a self-fire alarm system or the like.

[Background technology 1: The second-largest cause of building fires (the first being arson) is improper use of cigarettes. The inventors of the present invention conducted an experiment to determine the ignition state caused by this cigarette, and found that the ignition state was quite large.

In other words, if you throw a lit cigarette into a garbage bin with paper waste, the cigarette's light will transfer to other cigarettes or paper waste.

In this case, the cigarette burns gradually, but the paper waste is carbonized. Furthermore, the amount of heat around the cigarette increases, and the amount of smoke emitted increases rapidly. A few seconds after the amount of smoke emitted increases rapidly, it ignites and the amount of smoke emitted decreases dramatically. This causes a fire.

As shown in Fig. fIS3, the change in smoke concentration up to the above-mentioned ignition was measured at the position X near and above garbage bin Y, and the change as shown in Fig. 4(a) was obtained. In other words, it will start smoldering a few minutes (a) after you throw away the cigarette in the garbage bin Y, and it will stay in this state for about 10 minutes to WL 10 minutes (mouth,).
Then, within a few seconds, the amount of smoke emitted suddenly increased (c) and caught fire (d).
After that, the amount of smoke emitted decreases and the flame increases (e). Here, in the period from (d) to (e) in the figure, the things inside garbage bin Y are in a state of burning on the surface, and after this, if there is anything flammable around it, it will be in a state of burning.

By the way, I closed the above-mentioned ignition experiment! (Carried out in a room where
When changes in smoke concentration were measured on the ceiling surface, the measurement results shown in Figure 4(b) were obtained. In other words, on the ceiling surface, see Figure 4 (
Even if the amount of smoke increases during the period of a) and (c), since no airflow is generated, the smoke does not reach the measurement position on the ceiling surface, and the measured value does not increase much (f).

When the ignition (d) in FIG. 4(a) occurs, an air current is generated due to the ignition, the ceiling surface is suddenly filled with smoke, and the smoke concentration at the measurement point also increases (g). This period (g) is several seconds. After that, the smoke concentration decreases as the past smoke and newly generated smoke are mixed (ch).

In this way, the changes in the detected smoke concentration deviate in time between the ceiling surface and the vicinity of garbage bin Y. Since the smoke sensor is normally installed on the ceiling, it detects changes in smoke concentration as shown in Figure 54 (b). In fire detection using conventional smoke sensors, a fire occurs immediately when the detected smoke concentration exceeds a predetermined value. If there is a period (H) in which the smoke decreases, the increase in smoke is temporary and cannot be detected using conventional methods, and there is a high possibility that it will be detected only after the smoke spreads to other things, and the fire caused by the cigarette is likely to be detected. There was a problem in that fire detection could not be performed reliably in the early stages of an outbreak.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned problems, and its purpose is to perform fire judgment according to the pattern of fire outbreaks caused by cigarettes, and to detect fires caused by cigarettes at an early stage. To provide a fire determination method that can reliably detect and determine fires in stages.

[Disclosure of the Invention 1 Figure 1 is a conceptual diagram of a system using the present invention. In the present invention, an analog smoke sensor 1 that generates an output at a level corresponding to changes in detected smoke concentration is used, and the sensor output is multiplexed and transmitted. The output information of the smoke sensor 1 is transmitted to the receiver 2 as data, or transmitted as a change in voltage #i via the line, and the output information of the smoke sensor 1 is given to the receiver Wi2, and the receiver (Fr[
2, the smoke concentration detected by the smoke sensor 1 is discriminated based on the information.

Next, the operation of the embodiment will be explained based on chart 70 in FIG.

First, in reception 8!2, the difference between the output of smoke sensor 1 and the detected value under normal conditions is verified to determine whether or not the detected smoke concentration has increased slightly, and it is determined that the detected smoke concentration has increased. If so, it is determined whether the increase continues for a predetermined period of time or not, and if it continues, that is, it is determined that smoke is occurring, the output level of the smoke sensor 1 suddenly increases. It is determined whether or not it has risen and increased. Alternatively, even if the continuity determination is negative, if it is determined that the smoke concentration has increased compared to before, the process moves to a process of determining whether the output level of the smoke sensor 1 has risen rapidly. When there is a rise in the increase, the fire occurrence and reception 8!3 are determined, and the fire f! ! It performs the first-class processing operation.

In this way, by providing a fire detection process that follows the pattern of fire occurrence caused by cigarettes, which starts from the generation of smoke and ignites, in addition to the normal fire detection process, it is possible to reliably detect the occurrence of a fire caused by cigarettes at an early stage. = [Effect of the invention] As described above, the present invention uses an analog smoke sensor that generates an output at a level corresponding to the detected smoke concentration, and when the detected smoke concentration increases with respect to the normal state, the increase continues. There is a process of determining whether or not it is sexual, and whether there is continuity or no continuity (but if the concentration is increasing further, 2!, W!
If there is a sudden increase in smoke density during this process, it is determined that a fire has occurred. Therefore, it is possible to determine whether a fire has occurred in accordance with the fire occurrence pattern of cigarettes. In addition, it is possible to reliably determine a fire in the early stages of a fire caused by a cigarette, which is difficult to do by simply distinguishing the smoke density, and it is possible to prevent the spread of the fire by extinguishing the fire at an early stage.

[Brief explanation of drawings]

Fig. 1 is a conceptual information diagram using the present invention, Fig. 2 is a 70-chart of the same example, Fig. 3 is an explanatory diagram of an experiment of the ignition process by a cigarette, and Fig. 4 is a diagram showing the smoke density and It is an explanatory diagram of measurement results showing the relationship with time, where 1 is a smoke sensor and 2 is a receiver. Agent Patent Attorney Ishi [11 艮 Above Figure 2 Figure 1 Figure 3 Procedure Supplement (self-motivated) September 1986 1, Indication of the case 1988 Patent H No. 66204 2, Title of the invention Fire Judgment Method 3, Relationship with the Amendment Case Patent Applicant Address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Sadao Fujii 4, agent postal code 530 5, date of amendment order 6, number of inventions increased by amendment None 7, subject of amendment) Specification 8, amendment Contents (1) The entire text of page f52, lines 1 to 12 of the specification of the present application is corrected as follows. ``After researching and considering how the state changes under each condition, the following was discovered.'' (2) ``Case of existence'' in line 20 of page 53 of the same Pt. ” he corrected.

Claims (1)

[Claims] (1) Using an analog smoke sensor that generates an output at a level corresponding to the detected smoke concentration, if there is an increase in the detected smoke concentration compared to the normal state, a process of determining whether the increase is continuous or not. and the process of determining whether there is continuity, or whether there is a sudden increase in smoke concentration when there is no continuity and the concentration is increasing further. A fire detection method that determines that a fire has occurred when