JPS60192207A - Detecting device for preventing disaster - Google Patents

Abstract

PURPOSE:To surely obtain the true normal value of a detect signal, by using the detect signal nearest to a normal waiting area as a holding signal from time to time and comparing the holding signal with the boundary signal between the normal waiting area and abnormal waiting area, and outputting, recording, and displaying the boundary signal when the compared result is inverted. CONSTITUTION:At a CPU it is discriminated that whether or not the latest detect signal is the detect signal nearest to a normal waiting area and a holding signal buffer is updated and the detect signal is registered in the buffer so as to hold the detect signal. Then the holding signal of a detecting section D1 of a number K=1 registered in the holding signal buffer is compared with a preset boundary signal of the normal waiting area and abnormal waiting area. When the holding signal is smaller than the boundary signal as a result of the comparison, the holding signal is initialized for the next supervisory period. If the holding signal is larger than the boundary signal, the number of the detecting section, holding signal value, processing time, etc., are recorded as data for maintenance operation and, at the same time, initialized after they are displayed on a display section DP as occasion demands. Thereafter, the number K=2 of another detecting section to be processed next is set. Similar operations are continued until the K becomes equal to N (K=N).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disaster prevention detection device that detects physical components such as smoke and temperature that occur or rise due to a fire, for example.

Traditionally, fire alarm equipment uses ionization smoke detectors,
Photoelectric smoke detectors or temperature detectors are used, gas leak detectors are used in gas leak alarm systems, and photoelectric intruder detectors are used in burglar alarm systems. A large number of detection devices are used in disaster prevention equipment.

False alarms due to changes in these disaster prevention detection devices over time have become a major problem. As for the cause of this change over time, most of it is due to contamination of the detection part, if we consider the light weight type 1 detector of fire alarm equipment to be one. However, the extent to which false alarms occur due to dirt in the detection unit largely depends on the structure of the detection unit. Located on the ceiling iI+i (T) side, detecting smoke infiltration'
4 In a scattered light type smoke detector where (DI) is located below, dust (J) is more likely to accumulate on the wall (W) of the detection chamber (DH) than on the optical system, and As shown in the temporal characteristics of the detection signal (S) in Figure 2, the increase in scattered light due to this dust (J) is the cause of false alarms, whereas the detection signal (S) as shown in Figure 3 is the cause of false alarms. A light source (L
In the case of a transmission type smoke detector in which D) and a light receiving element (P'D) are arranged facing each other, the detection signal (S) shown in Fig. 4 is
As shown by the temporal characteristics of
)- causes the light to be attenuated, causing false alarms. As described above, even if one photoelectric smoke detector is used, its characteristics change over time in various ways.

Therefore, as a conventional countermeasure, the standby area consisting of the band in which the detection signal before an alarm can fluctuate is divided into two, a normal standby area and an abnormal standby area, and this abnormal standby area is provided on the alarm side. A system has been proposed in which an advance warning signal is obtained when the detection signal output reaches this range.

When this preliminary information signal is generated, measures such as removing accumulated dust are taken.

However, even if the above-mentioned measures are taken, the user still suffers from the frequent occurrence of advance warning signals.

This is because, in order to obtain an accurate preliminary signal before the detection signal enters the alarm range, the abnormal standby range must have a sufficient width, which is easily affected by fluctuations in the normal detection signal. Because it will be. This situation is explained in FIG. 5, which is a part of FIG. 2 enlarged on the time axis. In other words, the detection signal output of a scattered light smoke detector of the type shown in Figure 1 installed in a certain office in one day is around 10 o'clock, when most office workers gather and the area is filled with smoke from smoking. The peak temperature is between 14:00 and 16:00, and the lowest is around 2:00.

In this way, the value of the detection signal output fluctuates greatly even over a short period of time, such as one day. If they had been waiting for a while, they would now be plagued by frequent warnings.

As part of solving this point (1), we decided to check whether the detection signal output is in the abnormal standby area at the time when the smoke or dust in the office is at its lowest, for example around 2 am in the case of Figure 5. It is also conceivable to set a time for determining whether However, the pattern of change in the detection signal output is not constant, and there is no guarantee that it will always reach the minimum at a fixed time.

Therefore, in the disaster prevention device 7 and the roasting device according to the present invention, there is provided a signal holding means which always uses the detection signal closest to the normal standby area as the holding signal, and a boundary signal So between the normal standby area and the abnormal standby area and the above holding signal. Comparing means for comparing and outputting when inverted, recording and displaying means for recording and displaying the output of the comparing means, and initializing means for initializing the signal holding means. By activating the detection signal, it is possible to ensure that the true normal value of the detection signal is obtained no matter what change pattern the detection signal takes. Explain.

As the disaster prevention equipment to which this invention is applied, we have selected the computer-processed polling system disaster prevention installation 1iii, which has been attracting attention in recent years, but of course the scope of application of this invention is not limited by this. What is shown in Fig. 6 is a schematic configuration diagram of a disaster prevention monitoring Wi control device to which the disaster prevention detection device of the present invention is applied. The detection sections (D1 to N) are connected in parallel via the transmission section (DN). The middle packaging ((support) (CT) includes the central processing unit (CPU), storage device (M)
and each interface σ1. I2), the input operation section (K), the display section (Dr) and the transmission section (DNC
) is provided, and this transmission section (DNC) is connected to the line (t
) is connected to. Inside the storage device (M),
The processing procedures for each ridge of the entire apparatus have been registered, and at least a buffer is prepared in which the detection signals of each detection section are registered. Here, for convenience of explanation, the detection section (D) is the first detection section (D).
Assume that it is a scattered light type smoke detection section as shown in the figure, and at least includes a circuit that converts the analog signal obtained from the detection section into a digital signal, an address signal sent from the solid device (CT), and a self-address. It is assumed that the address detection circuit has an address detection circuit that detects a self add by comparing the addresses.

In the disaster prevention monitoring and control device configured as above,
The central processing unit (CPU) uses the interface (■
2), each detection unit (D +
-N) address and send out the address signal,
Call each detection unit (D, to N). On the detecting section (D) side, this address signal sent through the Hiji (t) is taken into the address detection circuit via the transmitting section (DN), and if it matches the own address, a detection output is generated. do. This detection output creates and assists a circuit that converts the analog signal obtained from the detection section into a digital signal, and sends the detection signal converted to a digital signal to a solid device (CT).

In this case, the central processing unit performs many processes such as fire monitoring, which is its original purpose, based on the detection signals of each detection unit (D, to N) that are detected as described above. Here, only the processing part for determining whether or not the detection signal is in the abnormality standby area, which is the object of the present invention, will be explained according to the flowcharts of FIGS. 7 and 8. 5 FIG. 7 a1 Only the part related to this invention in the main routine carried out as normal processing is extracted, and in step 71, the latest detection signal obtained as described above or the previous polling is extracted. It is determined whether the detected signal is smaller than the detected signal obtained at the time.

Since the detection signal is smaller (a) and is closer to the normal standby area, this signal is stored in the holding signal buffer in which the detection signal closest to the normal standby area corresponding to the detection part number currently being processed is registered in step 72. Update the signal and register
Hold the signal. Step like this? L72
This processing forms a signal holding means that always sets the detection signal closest to the normal standby area as a one-stop signal. Note that the determination in step 71 was a process of selecting signals smaller than the previous detection signal, but this naturally applies to signals whose characteristics tend to attenuate over time as shown in FIG. Select and process signals that are larger than the previous detection signal. Fortunately, this signal holding means can also be realized by an unconventional circuit configuration as shown in FIG. In other words, a capacitor (C) is connected between the positive and negative power supply terminals, and a forward diode (
A normally open contact (SW) as an initialization means, which will be described later, is provided in parallel with the capacitor (C). And the resistance (
A detection signal is input to the connection point between capacitor (C) and diode (DI), and a holding signal is obtained as an output from the connection point between capacitor (C) and diode (DI). With this configuration, the capacitor (C) is charged by the potential difference corresponding to the difference voltage between the power supply voltage and the input voltage of the detection signal, and when the input voltage decreases, the capacitor (C) is charged by that amount. When the battery is fully charged or rises again, the diode (DI) prevents charging, resulting in a structure in which the charged charge is retained. As a result, the detection signal closest to the normal standby range can be obtained from the output terminal as the holding signal at any time.

In addition, by closing the permanently open adult fish (SW), the electric charge of the capacitor is discharged and initialization is performed.

Then, the processing shown in FIG. 7 is performed for all the detection sections, and the detection signal closest to the normal standby range of the detection signals from each detection section is registered as a holding signal. The process shown in FIG. 8 is a process for determining whether or not each detection unit has been in a normal standby state since the previous process based on this holding signal. !:!The action may be performed automatically by a timer that can be set for a long period of time, such as one day or one week, which is not affected by short-term fluctuations such as smoke caused by smoking, or, Input operation section on the solid device (CT) side (
K) When the C process, which may be performed manually more regularly, is started, the number K of the detecting section (D) to be processed is immediately set to 1 in step 81.

Next, in step 82, the holding signal (=1) of the holding signal of the detection unit (Dl) and the preset normal standby area and abnormal standby area are added to the set number registered in Nofa. It compares it with the boundary signal and determines whether it is still smaller than the boundary signal without inverting from the normal standby area.If the result is smaller, the process goes to step 83, and this set is set to the set number for the next monitoring period. ==l detection unit (Dl
) initializes the hold signal.

However, if the result is large, proceed to step 84 before that,
After recording the incense code of this detection unit, its holding signal value, processing time, etc. as data during maintenance work, and displaying it on the display unit (DP:) as necessary, the process proceeds to step 83. When the initialization is completed in step 83, -2 is set to the number of the detection section (D) to be processed next in step 85.

Then, it is determined in step 86 whether or not this set number K is larger than the final number N of the detection section (D). If the result is not large, the process returns to step 82 and the same process is repeated with the final number N-4. However, if the result is large, it means that the processing has been completed for the timekeeping signals of all the detection units (D), and therefore the processing is ended. Then, based on the records or displays obtained in this way, measures such as cleaning the corresponding detection section are taken.

As described above, according to the detection device according to the present invention, only the detection signal closest to the normal standby area within the period can be detected, so no matter how the detection signal changes in the same pattern within the period, the detection unit can be reliably detected. The situation can be brought under control and appropriate measures such as cleaning can be taken. In fact, this invention can be implemented regardless of the temporal characteristics of the detection signal, so it is extremely useful for disaster prevention equipment.

[Brief explanation of the drawing]

1 and 3 are schematic longitudinal cross-sectional views of different structures of photoelectric smoke detectors, FIGS. The figure shows the second
The time axis of the figure is enlarged to show the ru partial characteristic curve, FIG. 6 is a schematic configuration diagram of a disaster prevention monitoring and control device to which the disaster prevention detection device according to the present invention is applied, and FIGS. 7 and 8 are disaster prevention according to the present invention. FIG. 9 is a flowchart used to explain the operation of the disaster prevention detection device according to the present invention, and is a circuit diagram in which the signal holding means and initialization means of the disaster prevention detection device according to the present invention are realized by a circuit configuration. Dl-N...Detection unit, CPU...Central processing unit, M...
・Storage device, DP... Display section % measurement applicant Nisotan Co., Ltd.

Claims (1)

[Claims] A detection unit that detects a certain amount of smoke, temperature, etc. and outputs a detection number B corresponding to the detected amount;
E In a disaster prevention detection device that processes separately into an area, an abnormality standby area, and an alarm area, a signal holding means that holds a detection signal closest to the city Josuke area at any time as a holding signal; Comparing means for comparing the boundary signal between tt and the abnormal standby area and the above-mentioned first pause signal and outputting it at the time of reversal; recording and displaying means for recording and displaying the output of the comparing means; A disaster prevention detection device is provided with an initialization means for detecting a fire, and periodically operates the comparison means and the initial Jυ1 conversion means.