JP2001067557A - Fire sensor and tester for fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent malfunction by varying a fire judgement level according to rise patterns of, temperature, smoke density, etc. SOLUTION: A reference memory is stored beforehand with time-series patterns A, B, and C of temperature, smoke density, etc., and fire judgment levels DA, DB, and DC while they are made to correspond to each other and a measured value memory is stored with detected temperature and smoke density in time series. The time-series pattern A, B, or C approximating the temperature and smoke density stored in the measured value memory is retrieved from the reference memory and the fire judgment level DA, DB, or DC corresponding to the retrieved judgment pattern A, B, or C is set as a fire judgment level DA, DB, or DC for judging the output of a fire signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic fire alarm system, which is connected to a fire receiver and judges a fire occurrence based on temperature and smoke density, and is connected to the fire detector. And a testing machine for conducting tests.

[0002]

2. Description of the Related Art Conventionally, automatic fire alarm systems have been introduced in buildings and condominiums, and a fire detector is connected to a fire receiver installed in a security room or the like via a detector line to receive a fire. When the aircraft receives a fire signal (warning signal) from a fire detector, it outputs an alarm.

[0003] The fire detector detects the temperature and smoke density at a fixed cycle (for example, one second cycle) to monitor the occurrence of a fire, and the detected temperature and smoke density indicate a predetermined fire judgment level. When it exceeds, a fire signal is output.

[0004]

However, in the above-mentioned conventional fire detector, in the case of a smoke detector, it is determined that cigarette smoke or water vapor is a fire, and a fire signal is output even at a low smoke concentration due to the influence of dust and the like. There was something to do. In the case of a heat detector, a rise in temperature due to a heater or the like may be determined to be a fire.

FIG. 9 is a diagram showing the operation of a conventional smoke detector. In this figure, a rise in smoke density is shown in time series, a fire signal is output at time TH for smoke rise H, a fire signal is output at time TM for smoke rise M, and time is shown for smoke rise L. A fire signal is output at TL (TH <TM <TL). That is, as the rate of increase in the smoke density is higher, the time required for the smoke density to exceed the fire determination level (shown by a dotted line in the figure) is faster.

[0006] However, the pattern of the smoke density increase H is often the case of misinformation due to cigarette smoke or water vapor.
It has been known from experience that the patterns of the smoke density increases M and L correspond to actual fires. As a result, there is a problem that the smoke density increase pattern that is likely to be a false report outputs a fire signal earlier. The present invention has been made in view of such circumstances, and by changing a fire determination level according to a temperature or smoke density rising pattern, a fire detector that prevents malfunction from occurring,
It is another object of the present invention to provide a tester for obtaining a test result by connecting to a fire detector.

[0007]

In order to achieve the above object, a fire detector according to the first aspect of the present invention associates a time series pattern of temperature and smoke density with a fire determination level in advance. , A plurality of reference memories, and a measured value memory that stores detected temperatures and smoke concentrations in a time-series manner, and searches the reference memory for a time-series pattern that approximates the temperature and smoke concentrations stored in the measured value memory. Then, the fire judgment level stored corresponding to the searched time-series pattern is set as a fire judgment level for judging the output of a fire signal. That is, the fire judgment level is changed according to the change pattern of the temperature and the smoke to prevent malfunction.

According to a second aspect, in the first aspect, the reference memory has a high probability of an actual fire as a fire determination level corresponding to a time-series pattern of temperature and smoke density in the case of a high probability of a malfunction. And storing a level higher than the fire judgment level corresponding to the time series pattern of the temperature and the smoke density. That is, when the probability of malfunction is high, the fire determination level is increased.

According to a third aspect, in the first or second aspect, when the same time-series pattern is searched for a predetermined number of times from the reference memory within a predetermined time, the fire determination level is set.
It is characterized by being raised by a predetermined level. According to a fourth aspect of the present invention, in any one of the first to third aspects, when a predetermined level of temperature or smoke density is not detected within a predetermined time, the fire determination level is lowered by the predetermined level. .

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an alarm pattern memory is further provided,
When the detected temperature or smoke density exceeds the fire judgment level, a fire signal is output and the time-series pattern of temperature and smoke density searched from the reference memory at that time is used.
It is stored in an alarm pattern memory. According to a sixth aspect of the present invention, the apparatus further comprises a connection unit for connecting the tester according to the fifth aspect. And a time series pattern of smoke density are returned to the testing machine as a test result signal.

[0011] A fire detector tester according to claim 7 is
A test device connected to the fire sensor according to claim 6, wherein power supply means for supplying power to the connected fire sensor, signal analysis means for analyzing a test result signal received from the fire sensor, And a notifying means for notifying the contents of the test result signal analyzed by the signal analyzing means.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the operation of the fire detector according to the present invention, and FIG. 2 is a block diagram showing an example of the configuration of the fire detector. As shown in FIG. 2, the fire detector 1 is connected to a fire receiver 2 via a detector line L, and is installed in an appropriate place such as a building, and detects the surrounding temperature and smoke density. Fire monitoring.

The fire detector 1 includes a CPU and the like, and controls a main part of the fire detector 1. A smoke detector detects a smoke density, and a heat detector detects an ambient temperature. Unit 11 and a transmission control unit 12 for transmitting and receiving signals between the fire receiver 2, and further, in advance, a time series pattern of temperature and smoke density is associated with a fire determination level,
A reference memory 13 that stores a plurality of values and a measured value memory 14 that stores detected temperatures and smoke concentrations in a time series are provided. Further, there is provided a fire judgment level memory 15 for storing a current fire judgment level, and an alarm pattern memory 16 for storing a time series pattern of temperature and smoke density when a fire signal is output.

The detection unit 11 detects the ambient temperature and smoke density at a constant cycle (for example, one second cycle). The main control unit 10 stores the detected temperature and smoke density in a time series in the measured value memory 14. To memorize. At the same time, from the reference memory 13,
A time-series pattern approximating the temperature or smoke density stored in the measured value memory 14 is searched, and the fire judgment level stored corresponding to the searched time-series pattern is set to a fire for judging a fire signal output. Set to the judgment level. That is, the fire judgment level stored in the fire judgment level memory 15 is updated in accordance with the change pattern of the temperature and the smoke density, and it is determined whether the detected temperature or smoke density is caused by the fire at the fire judgment level. .

In FIG. 1, the smoke density increasing patterns are classified into three patterns (patterns A, B, and C), and the fire determination levels DA, DB, and DC are set according to each pattern. Here, the higher the rate of increase in smoke density,
The fire judgment level is set high (DA>DB> DC).
When the smoke density rise pattern is pattern A, a fire signal is output at the time TH when the smoke density exceeds DA (alarm)
In the case of pattern B, the time T when the smoke density exceeds DB
M, the smoke density is DC
The alarm is issued at a time TL that exceeds.

In this case, the reference memory 13 stores the temperature and the smoke density when the probability of an actual fire is high as the fire judgment level corresponding to the time series pattern of the temperature and the smoke density when the probability of malfunction is high. A level higher than the fire judgment level corresponding to the time-series pattern is stored (DA> D).
B, DC). Thereby, when the pattern is highly likely to be a real fire, the sensitivity of the fire detector 1 is made more sensitive,
If a pattern is likely to be a malfunction (false alarm) while a low smoke density is issued, the sensitivity of the fire detector 1 can be made insensitive so that the alarm is not issued unless the smoke density increases. Thus, the reliability of the fire detector 1 and the entire system can be improved.

FIG. 3 is a flowchart showing the basic operation of the fire detector 1 described above. FIG. 3A shows a process of updating the fire judgment level (100 to 105), and FIG. 3B shows an alerting process (110 to 114). These processes operate simultaneously in parallel. Here, the case where the fire detector 1 is a heat detector is shown. FIG.
As shown in (a), in the fire detector 1, the detecting unit 11 detects the ambient temperature and stores the temperature data in the measured value memory 14.
After that, the temperature change pattern and the reference memory 13
Is compared with each of the patterns stored in. Then, when the pattern is changed, the fire judgment level stored in the fire judgment level memory 15 is changed to a level corresponding to the determined pattern.

On the other hand, as shown in FIG.
As a result of comparing the ambient temperature detected in step 1 with the fire judgment level stored in the fire judgment level memory 15, when the detected temperature exceeds the fire judgment level, a fire signal is output and the pattern at that time is generated. Report pattern memory 1
6 is stored. That is, in the fire detector 1 of the present invention,
When the detected temperature or smoke density exceeds the fire determination level, a fire signal is output, and the time series pattern of the temperature and smoke density retrieved from the reference memory 13 at that time is stored in the alarm pattern memory 16. I do. As a result, in the periodic inspection, a test machine (to be described later) is connected to the fire detector 1 and when a test signal is received from the test machine, the time series pattern of the temperature and smoke density stored in the alarm pattern memory 16 is used. , As a test result signal.

FIG. 4 shows smoke density history patterns (P1 to P6) stored in the reference memory 13 when the fire detector 1 is a smoke detector, and FIG. 5 shows the fire detector. The pattern (P1 to P6) of the ambient temperature history stored in the reference memory 13 when 1 is a heat sensor is shown.
Next, another operation of the fire detector 1 of the present invention will be described. In the main control unit 10, the reference memory 13
Therefore, when the same time-series pattern is searched for a predetermined number of times, the fire determination level is increased by the predetermined level.

FIG. 6 shows an example of the operation at this time. Here, the smoke density change does not reach the fire judgment level DB, but when the change belonging to the pattern B repeatedly occurs, the pattern B Is raised from DB to DB 'to make the sensitivity insensitive. For example, when a smoke density change due to smoking occurring at each meeting is detected in a meeting room or the like, a malfunction can be prevented by shifting the fire determination level by the learning function.

Conversely, if a predetermined level of temperature or smoke density is not detected within a predetermined time, the fire determination level can be lowered by the predetermined level. That is,
By gradually lowering the fire judgment level and increasing the sensitivity, it is possible to match the installation environment. Next, a fire detector tester will be described. As shown in FIG. 7, at the time of periodic inspection (at the time of a test), the fire detector 1 is removed from the detector base, and the portable tester 3 is connected to the fire detector 1. Here, the transmission control unit 12 connected to the detector line L derived from the fire receiver 2
The connection unit connected to the test machine 3 is configured. Testing machine 3
Is connected, the pattern (“P3 (pattern 3)” in the figure) stored in the alarm pattern memory 16 is displayed on the display unit 34 of the tester 3 as a test result.

FIG. 8 is a block diagram showing an example of the internal configuration of the tester. The tester 3 includes a signal control unit 30 for controlling each unit, an interface unit 31 for transmitting a signal between the fire detector 1 connected thereto, and a power supply unit for supplying power to the fire detector 1 side. And a control unit 33 including a power button, a test start button, and the like.
And a display unit 34 composed of an LED or an LCD, and a sound output unit 35 for outputting a signal sound, a voice message, and the like.

The signal processing section 30 constitutes a signal analyzing means, and starts power supply from the power supply section 32 when the operation section 33 is operated or when the fire detector 1 is connected. When the test result signal is received from the fire detector 1, the received test result signal is analyzed, and the display unit 34 and the sound output unit 35 output the analyzed change pattern such as smoke density at the time of the alarm. Therefore, here, the display unit 34 and the sound output unit 35 constitute notification means for notifying the contents of the test result signal analyzed by the signal analysis means.

In this case, the tester 3 notifies the change pattern such as the smoke density at the time of the alarm, but the present invention is not limited to this. May be notified. In that case, the fire detector 1 stores the fire judgment level stored in the fire judgment level memory 15 at the time of the alarm in the alarm pattern memory 16 and responds to the test signal from the test machine 3 with the alarm pattern. The fire determination level stored in the memory 16 is returned as a test result signal.

The inspector can easily perform the inspection work by confirming the content of the reported test result signal, so that the history of the alarm can be easily understood, and in the case of an erroneous alarm, the cause can be easily investigated.

[0026]

As can be understood from the above description, in the fire detector according to the first to sixth aspects of the present invention, the time series pattern of the temperature and the smoke density and the fire judgment level are corresponded in advance. Then, if multiple are stored, a pattern that approximates the detected temperature and smoke density to a time-series pattern is searched,
A fire judgment level corresponding to the pattern can be set. That is, since the fire determination level can be changed according to the change pattern of the temperature and smoke, malfunction can be prevented and reliability can be improved.

In particular, according to the present invention, the reference memory stores the temperature when the probability of an actual fire is high and the fire determination level corresponding to the time series pattern of the smoke density when the probability of a malfunction is high. Since a level higher than the fire judgment level corresponding to the time series pattern of the smoke density is stored, when the probability of malfunction is high, the fire judgment level can be increased to prevent false alarms.

According to the third aspect, when the same pattern of the change pattern of the temperature and the smoke is repeated, the fire judgment level is increased by a predetermined level, so that occurrence of malfunction can be prevented beforehand. According to the fourth aspect, when a predetermined level of temperature or smoke density is not detected within a predetermined time, the fire determination level is lowered by the predetermined level, so that a fire determination level suitable for the installation environment can be set.

According to the present invention, when a fire signal is output, the time series pattern of the temperature and smoke density retrieved from the reference memory at that time is stored in the alarm pattern memory. By checking the stored pattern, it is useful to find out the cause of the malfunction. According to the sixth aspect, when the tester is connected and a test signal is received from the tester, the time series pattern of the temperature and smoke density stored in the alarm pattern memory is returned to the tester as a test result signal. The report history can be easily checked on the tester.

In the fire detector testing apparatus according to the present invention, since the fire detector is connected to the fire detector, the test result signal received from the fire detector is analyzed, and the content of the test result signal is reported. You can easily check the fire history of the fire detector.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the operation of a fire detector according to the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of a fire detector according to the present invention.

FIG. 3 is a flowchart showing an example of the operation of the fire detector of the present invention.

FIG. 4 is a diagram showing an example of a time series pattern of smoke density stored in a reference memory.

FIG. 5 is a diagram illustrating an example of a time-series pattern of an ambient temperature stored in a reference memory.

FIG. 6 is a diagram showing an example of another operation of the fire detector of the present invention.

FIG. 7 is a diagram illustrating a test by the fire detector testing machine of the present invention.

FIG. 8 is a block diagram showing an example of a configuration of a fire detector tester of the present invention.

FIG. 9 is a diagram showing an example of the operation of a conventional fire detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detector 10 Main control part 11 Detecting part 12 Transmission control part 13 Reference memory 14 Measured value memory 15 Fire judgment level memory 16 Alarm pattern memory 2 Fire receiver 3 Fire detector tester 34 Display part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Shoichi Oka 1048 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works F-term (reference) CA13

Claims (7)

[Claims] A fire detector configured to detect a temperature or smoke density and output a fire signal when the detected temperature or smoke density exceeds a fire determination level. A reference memory that stores a plurality of patterns in association with a fire pattern and a fire determination level, and a measured value memory that stores detected temperatures and smoke concentrations in a time-series manner are stored in the measured value memory from the reference memory. Search for a time-series pattern that approximates the detected temperature and smoke density, and set the stored fire judgment level corresponding to the searched time-series pattern to the fire judgment level for judging the output of the fire signal. A fire detector. The reference memory includes a fire judgment level corresponding to a time-series pattern of temperature and smoke density in the case where the probability of malfunction is high. 2. The system according to claim 1, wherein a level higher than a fire judgment level corresponding to the sequence pattern is stored.
The fire detector according to the above. 3. The method according to claim 1, wherein when the same time-series pattern is searched a predetermined number of times from the reference memory within a predetermined time, the fire determination level is increased by a predetermined level. The described fire detector. 4. The fire judging level is reduced by a predetermined level when a predetermined level of temperature or smoke density is not detected within a predetermined time. Fire detector. 5. An alarm pattern memory, further comprising: outputting a fire signal when the detected temperature or smoke density exceeds the fire determination level; The fire detector according to any one of claims 1 to 4, wherein a time series pattern of smoke density is stored in the alarm pattern memory. 6. A connection unit for connecting a test machine, wherein the test unit is connected to the connection unit, and when a test signal is received from the test machine, the temperature and smoke density stored in the alarm pattern memory are provided. 6. The fire detector according to claim 5, wherein the time series pattern is returned to the testing machine as a test result signal. 7. A tester connected to the fire detector according to claim 6, wherein a power supply means for supplying power to the connected fire detector and a test result signal received from the fire detector are analyzed. A fire detector tester, comprising: signal analysis means; and notification means for notifying the contents of the test result signal analyzed by the signal analysis means.