JPH03127198A - Smoke monitoring system - Google Patents

Abstract

PURPOSE:To prevent a warning from being generated by smoke due to smoking and further to speedily detect the abnormal increase of smoke density due to fire, etc., by judging whether the smoke density is abnormal or not while changing a threshold value corresponding to a smoking state or the ventilating state of a room. CONSTITUTION:A smoke density detecting means 3 detects the smoke density in the room as a monitoring object and outputs a smoke density signal and a smoking person number output means 4 outputs a smoking person number signal expressing the number of smoking persons in the room. Then, a ventilat ing state output means 6 outputs a ventilating state signal expressing the venti lating state of the room to a control means 5. At first, the control means 5 determines the threshold value based on the smoking person signal and the ventilating state signal. Next, the determined threshold value is compared with the smoke density expressed by the smoke density signal from the smoke density detecting means 3. When the smoke density is more than the threshold value, an abnormal signal is outputted to a warning means, etc., for example. Thus, the abnormality of the smoke density can be monitored while considering the smoking state or the ventilating state, as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a smoke monitoring system for monitoring the smoke concentration in a room, and in particular, is intended to monitor the smoke concentration in a room, taking into account smoking conditions and ventilation conditions.

[Prior Art] Conventionally, there is a photoelectric type smoke sensor, for example. This is because the light-emitting element and the light-receiving element are housed in a housing so that their optical axes intersect at a predetermined angle (approximately 120 degrees) so that light beams are not exchanged at all times, and the intersection is located within the housing. It is located in the air flow path provided inside the body.

When smoke enters the flow path inside the housing, the light emitted from the light emitting element is scattered by the smoke and reaches the light receiving element, which transmits an electrical signal according to the amount of received light to a predetermined signal. Recognizes smoke density above abnormal density by comparing with a threshold value. If the smoke concentration was abnormally high, a bell or other alarm would be sounded.

[Problems to be Solved by the Invention] Incidentally, such smoke sensors are provided for fire detection, but they often malfunction. for example,
When installed in a conference room or the like, many smokers stay in the conference room for a long time and smoke, resulting in a high smoke concentration that sometimes causes an alarm to be activated even though there is no fire.

When an alarm is activated, people in the building must stop their work and evacuate, or check whether a fire is actually occurring, resulting in unnecessary actions.

If the threshold value is set high to avoid such inconveniences, an abnormal increase in smoke concentration due to a fire that occurs when no one is present can be quickly detected, which would make the monitoring pointless. There is a fear.

The present invention has been made in consideration of the above points, and provides a smoke monitoring system that does not issue an alarm due to smoke caused by smoking and can promptly detect an abnormal increase in smoke concentration. This is what I am trying to do.

[Means for Solving the Problem] In order to solve the problem, the present invention includes a smoke concentration detection means that detects the smoke concentration in a room to be monitored and outputs a smoke concentration signal, and a number of smokers in the room output means for outputting a number of smokers signal representing the number of smokers; a ventilation state output means for outputting a ventilation state signal representing the ventilation state of the room; and a number of smokers output by the number of smokers in the room output means. A threshold value for determining whether or not there is an abnormality is determined based on the signal and the ventilation status signal outputted by the ventilation status output means, and the determined darkness value and the smoke concentration represented by the smoke concentration signal from the smoke concentration detection means are determined. and control means for outputting an abnormal signal when the smoke concentration is equal to or higher than the threshold value.

[Operation] The smoke concentration detection means detects the smoke concentration in the room to be monitored and outputs a smoke concentration signal to the control means. The number of smokers output means receives, for example, a number of smokers signal representing the number of smokers in the room obtained by a detection operation or is set in advance, and the ventilation state output means outputs, for example, a preset ventilation state of the room. A ventilation status signal representing the ventilation status is output to the control means.

The control means first determines a threshold value for determining whether or not there is an abnormality based on the number of smokers signal output by the number of smokers in the room output means and the ventilation state signal outputted by the ventilation state output means. Next, this determined darkness value is compared with the smoke density represented by the smoke density signal from the smoke density detection means, and when the smoke density is equal to or higher than the darkness value, an abnormal signal is output to, for example, an alarm means.

As a result, it is possible to monitor abnormalities in smoke concentration while also taking into consideration the smoking status and ventilation status of the room in question.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, the smoke monitoring system 1 of this embodiment includes a means for detecting the number of people in the room 2, a means for detecting smoke concentration in the room 3, and a means for detecting the number of smokers in the room, which are provided in connection with the room to be monitored. means 4.

The means 2 for detecting the number of people in the room mainly includes, for example, two infrared sensors installed close to each other inside and outside the entrance of the target room, and a counter. The movement of a person is recognized by the activation of the infrared sensor, and whether the movement is into a room or out of the room is recognized by the activation order of the two infrared sensors. Then, if the movement is to enter a room, the counter count is incremented by l, and if the movement is to leave the room, the counter count is decremented by ↑. Therefore, the count on the counter always represents the number of people in the room.

The room smoke concentration detection means 3 has a configuration substantially similar to a conventional smoke sensor, and if it is a photoelectric smoke sensor, it outputs a photoelectrically converted electric signal as a smoke concentration signal. Note that the output signal is a digital signal.

The number of smokers in the room detection means 4 detects the number of smokers in the room at a certain point in time. For example, it consists of a thermograph that is attached to the ceiling of a room to obtain an fS temperature distribution image, a pattern analysis means, and the like. A temperature distribution image is obtained by thermography, and the pattern analysis means detects the lit portion of the cigarette from this image by color analysis to detect the number of smokers. In order to prevent false detection by a lighter or match, the number of people detected in two images that differ by a predetermined period of time (for example, 10 seconds) is compared to finally determine the number of smokers at that time.

The detection outputs of the number of people in the room detection means 2, the smoke concentration in the room detection means 3, and the number of smokers in the room detection means 4 are given to the control means 5 having a microcomputer configuration. This control means 5
A setting signal from the ventilation state setting means 6 is also given to the ventilation state setting means 6. The ventilation state setting means 6 is composed of, for example, a DIR switch, and is set in advance when the system 1 is installed in a target room. Note that for this setting operation, it is desirable to distribute a manual to the system installer so that the ventilation conditions can be determined based on the volume of the room, the number of windows, the presence or absence of a ventilation fan, etc.

The control means 5 executes the processing program shown in FIG. 2, determines an abnormal increase in smoke concentration due to a fire, etc., and outputs an abnormal signal.

In this embodiment, the abnormality signal is given to the alarm means 7. The alarm means 7 executes an alarm operation such as ringing a bell when an abnormal signal is given.

Next, details of the processing executed by the control means 5 will be explained using FIG. 2.

The control means 5 takes in the number of people in the room outputted from the number of people in the room detection means 2, judges whether the number of people in the room is different from the number taken in at the previous timing, and if it is different, the number of people in the room is stored in the built-in memory. The data stored in the number of members area is updated (step SPI, 5P2). Next, the control means 5 determines whether or not the number of smokers in the room output from the number of smokers in the room output from the number of smokers in the room detection means 4 is different from the number taken in at the previous timing. If so, update the data stored in the built-in memory area for the number of smokers in the room (step SP3).
．． 5P4). Thereafter, the set ventilation state is taken in from the ventilation state setting means 6 (step 5P5).

When the number of people in the room, the number of smokers in the room, and the ventilation state at that time are obtained in this way, a threshold value for determining whether or not to activate an alarm operation is calculated (step 5P6).

In this case, the calculation is performed by giving the largest weight to the number of smokers, the next largest weight to the number of people in the room, and giving a negative weight to the ventilation state.

For example, the larger the number of smokers, the larger the threshold value is increased according to the larger percentage. The larger the number of people in the room, the larger the threshold value is increased in small proportions. The better the ventilation condition, the smaller the threshold value will be.

After determining the threshold value in this way, the control means 5 collects the smoke concentration from the room smoke concentration detection means 3 and compares it with the determined threshold value (steps SP7, SP8>).

As a result, if it is determined that the smoke density is in a normal state where it is smaller than the threshold value, the process returns to step SP2 described above and the process described above is repeated. On the other hand, if it is determined that the detected smoke concentration is higher than the threshold value, which is an abnormal state, the alarm means 7 is activated and the process is terminated (step 5P9).

Therefore, according to the above-mentioned embodiment, the threshold value is changed depending on the smoking status and the ventilation status of the room to determine whether or not the smoke concentration is abnormal. Furthermore, in a state where there is no smoke, an abnormal increase in smoke concentration can be detected with high sensitivity, and an alarm can be issued quickly.

In addition, each detection means 2.3.4 in the above-mentioned example is
The present invention is not limited to the configuration described above.

For example, the number of people in the room may also be detected using thermography. Further, the smoke density may be detected using an ion method instead of a photoelectric method. Furthermore, the number of people in the room and the number of smokers in the room may be given to the control means by a setting operation using a key switch, etc., without using the detection operation. Although the method shown above is determined based on the number of smokers in the room and the ventilation condition, it may be determined based on at least the number of smokers in the room and the ventilation condition. As long as it includes at least these minimum characteristics, the threshold value 1 may be determined taking into consideration the characteristics of the pond.

[Effects of the Invention] As described above, according to the present invention, the threshold value is changed depending on the smoking state and the ventilation state of the room to determine whether or not the smoke concentration is abnormal. does not issue an alarm, and can quickly detect an abnormal increase in smoke concentration due to a fire or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the smoke monitoring system according to the present invention, and FIG. 2 is a processing flowchart 1 executed by its control means. DESCRIPTION OF SYMBOLS 1... Smoke monitoring system, 2... Means for detecting the number of people in the room, 3... Means for detecting smoke concentration in the room, 4... Means for detecting the number of smokers in the room, 5... Control means, 6. ... Ventilation state setting means, 7... Alarm means.

Claims (2)

[Claims] (1) A smoke concentration detection means for detecting the smoke concentration in the room to be monitored and outputting a smoke concentration signal; and an in-room smoker number output means for outputting a smoker number signal representing the number of smokers in the room. and ventilation state output means for outputting a ventilation state signal representing the ventilation state of the room; and a number of smokers signal outputted by the number of smokers in the room output means;
and determining a threshold value for determining whether or not there is an abnormality based on the ventilation status signal output by the ventilation status output means, and comparing the determined threshold value with the smoke concentration represented by the smoke concentration signal from the smoke concentration detection means. When the smoke density is above the threshold,
A smoke monitoring system comprising: a control means for outputting an abnormal signal. (2) A number of people in the room output means is provided for outputting a number of people signal representing the number of people in the room, and the control means determines the threshold value by taking into consideration the number of people signal outputted by the number of people in the room output means. Claim 1 characterized in that
Smoke monitoring systems as described in Section.