JPS60203276A - Fire information apparatus - 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 (Field of Industrial Application) The present invention relates to a fire alarm device that detects temperature, smoke concentration, etc. caused by a fire using an analog sensor to determine a fire.

(Prior art) In recent years, in order to solve the problems of false alarms and delays in fire detection in so-called on/off type fire alarm systems, in which fire detection was determined by setting a threshold value to a fire detector, it has been developed to Detected by analog sensor and sent to receiver,
A so-called analog fire alarm device has been proposed in which a fire is determined based on analog data received on the receiver side.

By the way, in such an analog fire alarm system, the reliability of the analog data is extremely important because fires are determined by processing the analog data from the sensor.
If the conditions for smoke to flow into the sensor from the fire point change, that is, the distance from directly above the fire point to the ceiling position where the sensor is installed, the smoke will spread and the smoke concentration will change depending on the distance even under the same fire conditions. It is expected that the analog data will vary due to the decrease in J-. However, in the conventional device, the distance from the fire point to the sensor is not taken into account, and there is a problem with the reliability of fire judgment when the distance from the fire point is different.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and is based on a method in which analog sensors that detect changes in physical phenomena due to fire are located at different distances from the fire point. To provide a highly reliable fire alarm device capable of processing fire judgment without being affected by distance.

(Structure of the Invention) In order to achieve this object, the inventors of the present application investigated the correlation of the sensor output with respect to the distance when changing the distance from the ceiling surface directly above the fire point to the ceiling surface installation position of the analog fire sensor. Based on this correlation, the analog data or fire detection threshold was corrected to the same data as if it were installed directly above the fire point, making it possible to judge a fire without being affected by distance. be.

(Example) FIG. 1 is a block diagram showing one embodiment of the present invention.

First, to explain the structure along with its function, 1a, . The detection output is received
2 is connected to the signal line. In addition, the analog sensor 1a~
The detection data 1o may be sent out in response to a time-sharing call from the receiver 2.

A sampling circuit 3 is provided in the receiver 2 to which the analog sensors 1a to 1n are connected by signal lines; converted into a signal. The output of the A/D converter 4 is input to a correction calculation circuit 5, which is a correction means that performs calculations to correct detection data based on the distance from just above the fire point to the analog sensor.

For this correction calculation by the correction calculation circuit 5, a spark spot detection device 6 and a spark spot judgment circuit 7 are provided.

The fire heat detection device 6 is a position detection means that detects a fire point by, for example, third-order limit scanning of a pair of heat ray detectors, with the guard area where the analog sensors 1a to 1n are installed as a monitoring area. The fire spot determination circuit 7 stores the sensor installation position in the warning section, and determines the distance 11ItX from just above the fire spot to the analog sensor according to the fire spot position detected by the fire spot detection device 6 and the corresponding analog sensor installation position. It is an arithmetic means for calculating, and outputs to the correction arithmetic circuit 5.

The correction of the detection data by the correction calculation circuit 5 based on the distance X from the spark point determination circuit 7 is shown in FIG. This is done based on the correlation obtained from a graph showing changes in sensor detection output.

In other words, in Figure 2, the height of the ceiling is constant, the output level when the smoke sensor is installed directly above the fire point is 1°0, and the distance when the smoke sensor is removed from directly above the fire point is 1IIItX. It shows changes based on experimental data in relative values to .

In addition, Figure 3 shows the change in the relative value of the detection level with respect to the distance x when the temperature sensor is placed directly above the fire point, assuming that the detection level is 1.0, and the temperature sensor is moved away from just above the fire point, based on experimental data. If the relative value y1 is the distance from directly above the flame point as The relative output y with respect to the distance X according to the exponential function β given by
It was experimentally confirmed that the following relationship was obtained. Therefore,
The correction calculation circuit 5 in FIG. 1 executes a correction calculation of 1=detected data based on the correlation of the exponential function of equation (1).

This correction calculation is performed based on the above formula (1), where the actual detection data is D' and the corrected detection data is DS, IIX DS = Dr /V = Dr /αe ・(2) How , correction data DS can be stored.

Here, α and β on the second right side of (2) are constants obtained from the graph shown in FIG. Therefore, regarding the right side of the above equation (2), K = 1 / y = 1 / ae-" - (3)
Then, the correction coefficient K can be determined for each analog sensor.

Therefore, in the correction calculation circuit 5 of FIG. 1, Ds =
Dr.
．． Detection data obtained when installed directly above the fire point that gives a value of 0 is determined by a correction calculation.

Referring again to FIG. 1, the detection data corrected to the height of the ceiling surface serving as a reference by the correction calculation circuit 5 is provided to the fire judgment circuit 8, and a fire judgment is made based on the corrected data. The fire judgment in this fire judgment circuit 8 is as follows:
For example, a process is executed to determine whether there is a fire by calculating the degree of risk based on the current detection data. Here, the degree of danger is defined as the increase in temperature or smoke concentration due to the occurrence of a fire, and the time it takes for the environmental condition to reach a dangerous state for humans in the near future.

This danger level can be calculated using the difference method, which predicts the time it will take to reach a predetermined danger level based on the difference between the current detection data and the previous detection data, or the change in temperature or smoke concentration caused by a fire. There is a function approximation method in which the constant of the polynomial is approximated by a polynomial, a constant of the polynomial is calculated from a plurality of currently collected detection data, and the time required to reach a predetermined risk level is determined as a solution of the polynomial.

Once the degree of danger has been determined using the difference method or function approximation method, it is compared with a predetermined threshold of the degree of danger, and the time required to reach the danger level is determined. Since the risk of fire is high, when the degree of danger is less than the threshold of the degree of danger, it is determined that there is a fire and the output is output.

Historically, in addition to predicting fires using the 291 division method or function approximation method, corrected detection data is compared with a preset alarm level threshold, and when the detection data exceeds the threshold level, it is determined that there is a fire. niu te L) ni.

When a fire output is obtained by the fire judgment in the fire judgment circuit 8, the fire output is given to the alarm display section 9, and a fire alarm is displayed together with the district display indicating the area where the analog sensor is installed.

Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to the operation flow shown in FIG. 4.

First, the sampling circuit 3 of the receiver 2 periodically collects analog detection data D1 from the analog sensors 1a to 1n.
．． D2. . . . Dn is sequentially sampled in block a, and the sampling data is converted into digital data by the A/D converter 4 and provided to the correction calculation circuit 5.

On the other hand, when a fire occurs, the fire point detection device 6 detects the position of the fire point within the \I precept area, and the fire point judgment circuit 7 determines the distance 111 ft from the fire point position to each analog sensor 1a to 1n.
n is calculated and given to the correction calculation circuit.

Therefore, the correction arithmetic circuit 5 uses the calculated distance X from the spark point determination narrow path 7 to execute the correction calculation based on the above-mentioned equation (4) in a blocked manner, and stores the correction data. This block b
The correction data calculated in is given to the fire judgment circuit 8, and in the judgment block C, the correction data is calculated based on the public/private or function approximation method.
Compare the risk level calculated by 4q with the threshold value of the risk level b
A fire judgment is made by comparing X% or correction data with a preset alarm level threshold (direct).
When the detection data corrected by the IC exceeds the preset Is mW alarm threshold, it is similarly determined that there is a fire and a fire alarm is issued in block d. A warning will be issued.

The embodiment shown in Fig. 1 is based on the case where the heights of the ceiling surfaces on which the analog sensors are installed are the same; however, when the heights of the ceiling surfaces are different, each The installation height of the sensor may be set in advance in the ceiling height setting circuit 10 as shown by the broken line, and the variation in sensor height due to the installation height may be corrected.

This correction calculation based on the installation height is also carried out in the same way as shown in Figures 2 and 3. If the relative output is 1.0 when the reference height HOl is, for example, 2.5 m, then experimentally the relative output y is -ptH- M・) y−αe, and the detection data is corrected according to the installation height H in the same way as in equations (2) to (4) above, and further corrected by the distance 1111X from directly above the fire point. Overturn the judgment of fire.

FIG. 5 is a block diagram showing another embodiment of the present invention, and this embodiment is characterized in that the threshold value for determining a fire is corrected by 1 or 0 depending on the distance from the fire point.

In FIG. 5, analog sensors 1a to 1n.

Sampling circuit 3. A/D converter4. Flash point detection device 6
, spark point judgment circuit 7. The fire judgment circuit 883 and the alarm display section 9 are the same as those in the embodiment shown in FIG.
A threshold value correction circuit 12 is newly provided to perform threshold value correction calculation based on the set value of .

This correction calculation by the threshold correction circuit 12 is performed based on the distance from just above the fire point to the analog sensor shown in FIGS.
Since the relationship between the detection output (relative value) and distance X shown in equation (1) above is obtained from the relationship between the relative output and the distance If the danger threshold is RO, then the distance from directly above the fire point + mx is the correction value of danger UlINa (<(Yo, R = Ro xi/y = Ro X 1/α-PX...
It is given by (5). Also, regarding the alarm level threshold, the distance l! that gives a relative output y=1.0! If the alarm level threshold at 1lIx-o is SO, then the corrected alarm level threshold S is given by 5=Soxy=soxcxe-"-(6). Therefore, the threshold value correction circuit of FIG. 12, when the fire judgment circuit 8 makes a fire judgment based on the calculation of the degree of danger, it corrects and calculates the threshold value of the degree of danger by using the equation (5) above, and on the other hand, the fire judgment circuit 8 determines whether the detected data and the alarm level are the same. When it is determined that there is a fire based on the comparison of
A fire judgment will be made based on the threshold value corrected in step 2.

That is, if the operation of the embodiment shown in FIG. 5 is explained according to the operation flow shown in FIG. 5) Perform a correction calculation of the danger threshold based on the distance from directly above the fire point calculated for each analog sensor based on the formula, and calculate the corrected threshold R1 obtained for each analog sensor in block b. , R2, . . . Ro are set. Next, in block C, analog data is sampled and detected data D1. D2. ...Qn, calculate the degree of risk R using the difference method or function approximation method from multiple detection data obtained in the current and past in block d, and calculate the correction for each sensor detected in the block. The wJ value of the calculated risk level is compared with the falsified risk level, and if the sieved risk level is below the corrected risk level threshold, a fire alarm is issued in block f.

In addition, in the embodiment shown in FIG. 5, an installation height setting device 10 shown by a broken line is provided in the same manner as in the embodiment shown in FIG. It is also possible to make a correction to determine whether there is a fire.

In the embodiment shown in FIG. 1.5, since a fire is directly detected by the fire point detection device 6, a fire alarm is issued by the fire point detection by the fire point detection device 6, and the fire alarm is issued by correcting the detection data or threshold value. Judging the degree of risk is avoidance 1? It may also be used for guidance.

(Effects of the Invention) As described above, according to the present invention, changes in physical phenomena in the surrounding environment due to the occurrence of a fire are detected by an analog sensor, and the detection data of the analog sensor is sampled at predetermined intervals to detect the occurrence of a fire. In the fire alarm system, the detection data of the analog sensor or the threshold value for fire judgment is corrected according to the distance from directly above the fire point to the sensor installation position, so even if the fire occurrence position relative to the analog sensor changes, It is possible to always make the same fire judgments as if a sensor were installed directly above the fire point, and extremely reliable fire judgments can be made.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
Figure 3 is a graph showing the relative change in sensor output with respect to the distance from just above the fire point to the sensor installation position, and Figure 4 is a graph showing the relative change in sensor output with respect to the distance from just above the fire point to the sensor installation position.
FIG. 5 is a block diagram showing another embodiment of the present invention, and FIG. 6 is an operation flow diagram of the embodiment shown in FIG. 18 to 1n: Analog sensor 2: Receiver 3: Sampling circuit 4: A/D converter 5: Correction circuit 6: Fire spot detection device 7: Fire spot judgment circuit 8: Fire judgment circuit 9: Warning display section 10: Ceiling height setting device 12: Threshold correction circuit Patent applicant Bochiki Co., Ltd. Same as above Hiromitsu Ishii Agent Patent attorney Susumu Takeuchi Figure 2, Figure 3, ak-e9 no filJ! J Related Patent Applicant: Tokyo Parts District - ■ - Osaki 2-chome 10-43 Name (340) Hochiki Co., Ltd. (1 other person) 4, Agent address: 3-15-8 Nishi-Shinbashi, Minato-ku, Tokyo No. Nishi-Shinbashi Chuo Building 4th floor 6, Subject of amendment 7, Contents of amendment (1) Application for correction of the furigana of the inventor "Norio Murosu 1" in the column of "Inventors and patent applicants other than the above" of the application on a separate sheet. Correct as shown below. 〈2) Details μm, page 2, line 18 [by which the smoke is diffused and smoke J, [by which is the temperature, smoke is diffused and the temperature, V! ”
Correct to. (3) Line 9 of page 5 of the specification [3rd dimension] is defined as "3-dimensional"
Correct to. (4) "Danger Level" on page 9, line 3 of the specification is corrected to "Danger Level J." (5) "Danger Level" on page 9, line 7 of the specification [time to reach danger level 31i, i.e. [Danger] is corrected to [Danger]. The above is the relationship between Patent No. 61754 of 1989, 2, name of the invention, fire alarm device 3, and the person making the amendment 1'1. Patent applicant: 1, No. 10-43, Shoninzaki 2-chome, Tokyo Parts Industry Ward. name
(340) Bochiki Stock Company (1 other person) 4, Agent 41 1518 Ji3 Nishi-Shinbashi Chuo Building 4th floor, Nishi-Shimbashi 3, Minato-ku, Tokyo June 6, 1980 (Shipping date: On June 1982) 26th) 6. Subject of amendment: "Inner surface proving authority of representation" and "Drawings" 7.? Contents of ili suspension (1) Submit two copies of the power of attorney to JR as shown in the attached sheet. (2) Submit a drawing (with no changes in content) that has been engraved as shown in the attached sheet. that's all

Claims (1)

[Claims] A fire alarm device that detects changes in physical phenomena in the surrounding environment due to the occurrence of a fire using an analog sensor, and samples the detection data of the analog sensor at predetermined intervals to determine a fire, comprising: position detection means for detecting the position of the analog sensor; a calculation means for calculating the distance between the ignition point and the analog sensor based on an output signal from the position detection means; 1. A fire alarm device comprising extraction means for correcting the detected data or the fire judgment threshold.