JP5120688B2 - Fire / non-fire discrimination device, fire / non-fire discrimination method and fire alarm - Google Patents

Description

  The present invention relates to a fire / non-fire discrimination device, a fire / non-fire discrimination method, and a fire alarm using the fire / non-fire discrimination device.

  Conventional fire alarms include, for example, a thermal sensor that detects temperature rise, a smoke sensor that detects smoke, a flame sensor that detects flame, and a CO sensor that detects carbon monoxide (CO) concentration. There are a single type having a sensor and a composite type having these sensors combined. A ministerial ordinance that establishes technical standards for residential fire alarms and automatic fire alarm equipment for houses stipulates having smoke sensors.

  A smoke fire alarm with a smoke sensor reacts to dust accumulation and cigarette smoke in the living room, and reacts to smoke and water vapor generated during cooking in the kitchen. May occur. For this reason, smoke fire alarms have not been approved for use in the kitchen. However, in recent years, it has become mandatory to install fire alarms in single-family homes, and smoke-based fire alarms have been adopted in the technical standards, and smoke-type fire alarms can be used in the kitchen. It is becoming increasingly important.

  In addition, from an experiment simulating a house fire, there is a fire in which the toxic CO concentration rises before the amount of smoke increases, such as Futon smoldering with sleeping cigarettes. Sometimes, in the worst case, there is a risk that the CO concentration or carbon monoxide hemoglobin (COHb) will reach a dangerous area before the smoke fire alarm is given, and will be delayed.

  On the other hand, an international standardization organization (ISO) has proposed an alarm device that detects CO generated together with smoke at the time of a fire and issues an alarm when the CO concentration exceeds a threshold value. The threshold value of CO concentration is determined based on the experiment of EN standard fire test standard TF3, and the threshold value is as low as 50 ppm. However, since the CO concentration generated from the combustion equipment (stove, fan heater, etc.) used on a daily basis can be higher than 50 ppm, such a low CO concentration threshold is used to operate the combustion equipment. May react and give a false alarm.

  As described above, with conventional fire alarms, even if a physical quantity such as smoke that exceeds the threshold is detected, is it due to a fire, or is it due to a non-fire caused by cooking or use of a combustor? It was not possible to make a judgment, and a false alarm was generated or a fire could not be detected early.

In order to solve the above problems, as a conventional fire alarm device, as a method for discriminating between fire and non-fire, 1) a method of changing an operation level according to smoke rising time and comparing it with a threshold (for example, Patent Document 1) 2) A method for setting a fire area and a non-fire area and selecting which area from smoke and CO concentration (for example, refer to Patent Document 2), 3) of smoke and CO concentration A method of determining a fire based on a change rate (for example, see Patent Document 3) has been proposed.
JP 2006-146738 A JP 2006-146843 A JP 2006-277138 A

  However, although the above-mentioned conventional method can discriminate non-fire due to cigarettes, etc., between real fire and non-fire that generates CO and smoke, it effectively prevents non-fire due to CO and smoke generated during cooking. There was no discriminating method that could be a decisive factor.

  Therefore, in view of the above-described problems, the present invention provides a fire / non-fire discrimination device, a fire / non-fire discrimination method, and a fire / non-fire discrimination method capable of effectively discriminating between an actual fire and a non-fire by detecting CO and smoke. The object is to provide a fire alarm using a fire discrimination device.

The invention of claim 1, wherein has been made to solve the aforementioned problems is a fire or non-fire discrimination apparatus for discriminating a fire and non-fire, a CO sensor for detecting the CO concentration, smoke sensor for detecting smoke density And when the CO concentration detected at each predetermined detection timing by the CO sensor becomes equal to or higher than the first set CO concentration, and the smoke concentration detected at the predetermined detection timing by the smoke sensor is set to the first setting. A first determination means for determining which one of the time points when the smoke concentration is exceeded, a second determination means for determining whether or not the CO concentration continuously increases, and a predetermined detection timing by the smoke sensor; Third determination means for determining whether or not the smoke concentration detected for each time exceeds the first set smoke concentration; and the first determination means first sets the CO concentration to the first set CO concentration. If it is determined that First counting means for counting a first elapsed time until it is determined by the third determining means that the smoke density exceeds the first set smoke density, and the second determining means When it is determined that the CO concentration continuously increases, the first elapsed time is the time that the CO concentration reaches the first set CO concentration and the smoke concentration is the first set smoke concentration. And a fourth determination means for determining whether or not a time difference with respect to a time until reaching a predetermined time threshold is greater than or equal to a predetermined first time threshold, and the first elapsed time by the fourth determination means Fire determining means for determining a fire when it is determined that is greater than or equal to the first time threshold, and the first elapsed time is the first time threshold by the fourth determining means. If it is not determined that the value is higher than the value, Characterized in that it and a separate non-fire discriminating means.

The invention according to claim 2, which has been made to solve the above problem, is the fire / non-fire discrimination device according to claim 1 , wherein the second determination means determines that the CO concentration is continuously increased. If not, a fifth determination means for determining whether or not the smoke density has reached the first set smoke density within a predetermined time from that time point, the non-fire determination means, Furthermore, when it is determined by the fifth determination means that the smoke density has reached the first set smoke density within a predetermined time, it is determined that there is no fire.

The invention according to claim 3, which has been made in order to solve the above-mentioned problem, is the fire / non-fire discrimination device according to claim 1 or 2 , wherein the smoke concentration is determined to be continuously increased. 6 and when the smoke density is determined to have reached the first set smoke density first, the smoke density is determined from the first set smoke density to the first set smoke density. When the second count means for counting the second elapsed time until the second set smoke density set higher than the set smoke density is reached, and the sixth judgment means, the smoke density increases continuously. If it is determined that the second elapsed time counted by the second counting means, the second elapsed time until the smoke density reaches the second set smoke density from the first set density Over a predetermined second time threshold for time And a seventh determination unit configured to determine whether the second elapsed time is equal to or greater than the second time threshold value in the seventh determination unit. If it is determined that the fire has occurred, it is determined that there is a fire, and the non-fire determination means further includes the seventh determination means in which the second elapsed time is greater than or equal to the second time threshold value. If it is not judged, it is judged as non-fire.

According to a fourth aspect of the present invention, there is provided the fire / non-fire determination device according to the third aspect , wherein the non-fire determination means further includes the sixth determination means in which the smoke concentration is determined. If it is not determined that it is continuously rising, it is determined that it is non-fire.

The invention according to claim 5 made to solve the above-mentioned problems uses the fire / non-fire discrimination device according to any one of claims 1 to 4 .

The invention according to claim 6 made to solve the above-described problem is a fire alarm using the fire / non-fire discrimination device according to any one of claims 1 to 4 , wherein the fire / non-fire is detected. An eighth determination means for determining whether or not the smoke concentration exceeds a predetermined first fire determination smoke threshold when the fire determination device determines that a fire has occurred; and the eighth determination means And a notification means for notifying a fire alarm when it is determined that the smoke concentration exceeds the first fire determination smoke threshold.

The invention according to claim 7, which has been made to solve the above problem, sets a predetermined delay time in the fire alarm device according to claim 6 when the fire / non-fire discrimination device determines that the fire is not fire. And a delay time setting means for determining whether the smoke concentration has exceeded the first fire determination smoke threshold over the predetermined delay time set by the delay time setting means. A determination unit, and the notification unit further notifies a fire alarm when the ninth determination unit determines that the smoke concentration exceeds the first fire determination smoke threshold. Features.

The invention according to claim 8 made to solve the above-mentioned problem is the fire alarm device according to claim 7 , wherein the smoke concentration detected by the smoke sensor at each predetermined detection timing is the first fire determination smoke. It further comprises tenth determination means for determining whether or not a predetermined second fire determination smoke threshold value is higher than a threshold value, and the notification means is configured to set the delay time setting means. When a predetermined delay time elapses, when the smoke determination unit 10 determines that the smoke concentration exceeds the second fire determination smoke threshold value, a fire alarm is immediately notified.

According to the invention of claim 1, wherein, if the CO concentration in the first determination unit is determined to become the first set CO concentration above, CO concentration is continuously increased, and CO concentration first The first elapsed time from when the set CO concentration reaches the first set smoke concentration to the time when the CO concentration reaches the first set CO concentration and when the smoke concentration reaches the first set CO concentration. If the time difference from the time until reaching the set smoke concentration is greater than or equal to the predetermined first time threshold, it is determined as a fire, and if not, it is determined as a non-fire. In particular, it is possible to effectively distinguish non-fire due to cooking.

According to the second aspect of the present invention, when it is not determined that the CO concentration continuously increases, it is determined that the smoke concentration has reached the first set smoke concentration within a predetermined time from that point. Since it is determined that there is no fire, the non-fire caused mainly by cooking can be effectively determined.

According to the third aspect of the present invention, when the first determination means determines that the smoke density has first reached the first set smoke density, the smoke density continuously increases and the smoke density is the first. The second elapsed time from the set smoke density to the second set smoke density set higher than the first set smoke density is equal to or greater than a predetermined second time threshold value. Since the case is determined to be a fire and the case is not determined to be a non-fire, it is possible to effectively determine a fire and, in particular, a non-fire due to cooking.

According to the fourth aspect of the present invention, when it is not determined that the smoke concentration is continuously increasing, it is determined as non-fire, so it is possible to effectively determine mainly non-fire due to cooking.

According to the fifth aspect of the present invention, since the fire / non-fire discrimination device according to any one of the first to fourth aspects is used, the fire is surely notified, and in particular, false alarms caused by cooking are reduced. can do.

According to the invention described in claim 6 , when a fire / non-fire discrimination device determines that a fire has occurred, a fire alarm is notified when the smoke concentration exceeds the first fire determination smoke threshold. Can be reliably notified, and false alarms caused by cooking can be reduced.

According to the seventh aspect of the present invention, when the non-fire is determined by the fire / non-fire determination device, the smoke concentration exceeds the first fire determination smoke threshold over a predetermined delay time. Since the fire alarm is notified when the value exceeds, false alarms caused by cooking can be reduced.

According to the eighth aspect of the present invention, the smoke density is higher than the first fire determination smoke threshold value and exceeds a predetermined second fire determination smoke threshold value during the elapse of a predetermined delay time that has been set. In this case, a fire alarm is immediately notified, so that false alarms caused by cooking can be reduced, and a fire can be notified early.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a fire alarm using a fire / non-fire discrimination device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a fire alarm using a fire / non-fire discrimination device according to an embodiment of the present invention. The fire alarm 1 includes a microcomputer (hereinafter referred to as a microcomputer) 2, a CO sensor 3, a smoke sensor 4, an alarm output unit 5, an external output unit 6, and a storage unit 7.

  The microcomputer 2 includes a CPU 2a, a ROM 2b, and a RAM 2c, and the CPU 2a executes various processes including control according to the present embodiment in accordance with a control program stored in the ROM 2b. The RAM 2c appropriately stores data, programs, and the like necessary for the CPU 2a to execute various processes.

  The CO sensor 3 detects the CO concentration in the air and outputs a sensor output corresponding to the CO concentration. The CO sensor 3 may be any sensor that can detect the CO concentration. For example, a catalytic combustion type, an electrochemical type, an NDIR type, or the like is used.

  The smoke sensor 4 detects the amount of smoke in the air and outputs a sensor output corresponding to the amount of smoke. As the smoke sensor 4, a photoelectric sensor including a light emitting element and a light receiving element that receives irregularly reflected light by smoke particles is used.

  The alarm output unit 5 is for outputting a fire alarm under the control of the microcomputer 2, such as a sound output circuit such as a buzzer or a speech processor that emits an alarm sound or an alarm voice message, or a display output circuit such as an LED or LCD that displays an alarm. Etc. are configured. The external output unit 6 includes a communication circuit that transmits an alarm signal output from the microcomputer 2 to an external system, a security center, or the like.

  The memory | storage part 7 is a non-volatile memory means comprised by EEPROM (Electrically Erasable and Programmable ROM) etc., for example. In the storage unit 7, a first set CO concentration, a first set smoke concentration, a second set smoke concentration, a first time threshold value, a second value set in advance for use in a determination process described later are stored. , The first fire determination smoke density and the second fire determination smoke density are stored.

  Next, operation | movement of the fire alarm 1 which has the above-mentioned structure is demonstrated. In the present invention, in order to solve the above-described problems, fire experiments and cooking experiments shown in Tables 1 and 2 below are performed, and a fire / non-fire discrimination method is obtained based on the experimental results.

  Table 1 shows the fire experiment results. In Table 1, as fire patterns, trash can, stove (100% cotton futon), stove (cotton poly 50% futon), fired (100% cotton futon), stove (T-shirt), stove (feather futon) and tempura The order of generation of CO and smoke (SM) with respect to the fire experiment of each item (for example, CO <SM indicates that CO is generated earlier in time than smoke) and the time difference TA (CO = 5ppm and smoke = 2.5% / m generated time difference), how CO increases (maximum value in (), arrow indicates rising), and TB (seconds) (smoke concentration) : Time from 2.5% / m to 10% / m) and smoke concentration increasing method (in parentheses indicate maximum values, arrows indicate rising states).

  For example, with a stove (100% cotton futon), an experiment was conducted to ignite the stove and generate a fire in a situation where 100% cotton futon was placed in contact with the heater so as to face the reflector of the reflective stove. Is. The same applies to the other items in the stove. Also, kun-yaki (100% cotton futon) is an experiment in which a smoldering fire is generated by sandwiching a lit cigarette as a fire source between 100% cotton futon.

  Table 2 shows the cooking experiment results. In Table 2, the cooking pattern is sanma x2, sanma x1, sanma x1, meat + vegetables, meat + vegetables, meat and meat. The order of occurrence of CO and smoke (SM) for the cases of medium, small, large, none, large and none, the time difference TA, and the way of CO increase (in parentheses are maximum values, and the arrow indicates the state of increase. ), TB (seconds) (smoke concentration: time to reach 2.5% / m to 10% / m), and smoke concentration increase method (in parentheses are maximum values, arrows indicate the state of increase) .)

  The fire experiment was conducted in a fire laboratory simulating the residence of a general house, and the cooking experiment was conducted in a laboratory simulating a kitchen of a general house.

From the experimental results in Tables 1 and 2 above, the following was found.
(1) In the event of a fire, smoke is generated prior to CO, excluding kunyaki (100% cotton futon), and the time difference TA between CO and smoke in the case of kunyaki (100% cotton futon) is 27 minutes. And longer than other fire items.
(2) Tempura fire generates smoke before CO, but the time difference TA between CO and smoke generation is the maximum TA (120 seconds) among other fire items where smoke is generated before CO It is six times longer than the trash fire.
(3) At the time of a fire, except for kunyaki (100% cotton futon) and stove (feathers), both the CO and smoke concentrations rise linearly.
(4) In the cooking experiment, smoke is generated first except for Sanma × 2 and large ventilation fan capacity and Sanma × 1 and during ventilation fan capacity.
(5) In Sanma × 2 and large ventilation fan capacity, and in Sanma × 1 and ventilation fan capacity, even if CO occurs first, the CO rise is not linear unlike fire.

  Based on the above findings, fire / non-fire discrimination conditions are set as shown below from the initial state of CO <5 ppm and smoke <2.5% / m.

A. When CO> 5 ppm with smoke <2.5% / m 1) CO> 5 ppm when CO average moving average continues to rise until smoke> 2.5% / m If TA> 480 seconds until smoke> 2.5% / m from the time, fire is determined and delay time is set to 0 seconds, and if TA <480 seconds, non-fire is determined and delayed Set the time to 45 seconds. For TA ≧ 480 seconds, a time between TA = 27 minutes when fired (100% cotton futon) fire and TA = 435 seconds when cooking in the sama × 1 and ventilation fan capacity was selected.
2) If the increase of the moving average value of CO concentration stops until smoke> 2.5% / m, if smoke> 2.5% / m within 7 minutes from that point, It is determined that there is a fire, the delay time is set to 45 seconds, and if smoke does not reach 2.5% / m within 7 minutes from that point, the process returns to the start of determination.

B. When smoke <2.5% / m with CO <5ppm or when CO> 5ppm and smoke> 2.5% / m 1) Smoke density until smoke> 10% / m If the moving average value continues to rise, if the time TB ≧ 210 seconds until the smoke concentration reaches 2.5% / m to 10% / m, it is determined that there is a fire and the delay time is set to 0 seconds. If TB <210 seconds, it is determined that there is no fire, and the delay time is set to 45 seconds. This TB ≧ 210 seconds was selected as a time between TB = 4.9 minutes during tempura fire and TB = 190 seconds during cooking with sama × 1 and small ventilation fan capacity.
2) If the moving average value of smoke concentration stops before smoke> 10% / m, it is determined that there is no fire and the delay time is set to 45 seconds.

C. Canceling the delay time If smoke> 10% / m and smoke> 22.5% / m within 45 seconds, cancel the delay time and immediately alert, if smoke <10% / m If it is, cancel the alarm.

  Next, refer to the flowcharts shown in FIGS. 2 to 4 for the detailed operation of the fire detection process of the fire alarm executed by the control of the CPU 2a of the microcomputer 2 based on the setting of the fire / non-fire discrimination condition as described above. While explaining.

  In FIG. 2, the CPU 2a first reads the sensor outputs of the CO sensor 3 and the smoke sensor 4 at every predetermined detection timing (for example, every 5 seconds) after turning on the power (step S1), and then reads the read CO sensor. Based on the sensor outputs of 3 and smoke sensor 4, a conversion calculation process for obtaining CO concentration Cco and smoke concentration Cs is performed (step S2).

  Next, the CPU 2a determines that the obtained CO concentration Cco is less than a first preset CO concentration, eg, 5 ppm, and the smoke concentration Cs is a preset first preset smoke concentration, eg, 2.5%. If the CO concentration Cco is less than 5 ppm and the smoke concentration Cs is less than 2.5% (Y in step S3), the process returns to step S1 to perform the determination operation. repeat. If the CO concentration Cco is less than 5 ppm and the smoke concentration Cs is not less than 2.5% (N in step S3), the CPU 2a then has the CO concentration Cco of 5 ppm or more and the smoke concentration Cs is less than 2.5%. Is determined (step S4).

  If the CO concentration Cco is 5 ppm or more and the smoke concentration Cs is less than 2.5% (Y in step S4), then the CPU 2a starts the moving average process of the CO concentration Cco and sets CO ≧ 5 ppm. The counting of the time difference TA from the time of reaching until smoke> 2.5% / m is started (step S5). For example, the moving average processing described above includes six sensor outputs from the CO sensor 3 measured every 5 seconds (one sensor output at the measurement time and five sensor outputs measured before the measurement time). The 30-second moving average value Cco (n) of the CO concentration conversion value based on (including) is calculated.

  Next, the CPU 2a determines whether or not the previously calculated 30 second moving average value Cco (n-1) of the CO concentration is lower than the currently calculated 30 second moving average value Cco (n) (step S6). Since this determination is performed based on the moving average value for 30 seconds subjected to the moving average process, it is possible to determine whether or not the CO concentration tends to increase by eliminating the influence of the instantaneous decrease in the CO concentration.

  If Cco (n-1) is lower than Cco (n) (Y in step S6), the CO concentration tends to increase continuously, so the CPU 2a then has a smoke concentration Cs of 2. It is determined whether it exceeds 5% / m (step S7). If the smoke density Cs does not exceed 2.5% / m (N in step S7), then return to step S6, and if the smoke density Cs exceeds 2.5% / m (Y in step S7), Next, the CPU 2a determines whether or not the time difference TA has reached a preset first time threshold, for example, 480 seconds (step S8). If the count of the time difference TA is 480 seconds or more, the CPU 2a determines that there is a fire (step S9), and then performs a fire determination process (step S10). If the count of the time difference TA is not 480 seconds or more, the CPU 2a determines that there is no fire (step S18), and then performs non-fire determination processing (step S19).

  On the other hand, if Cco (n−1) is not less than Cco (n) in step S6 (N in step S6), then the CPU 2a starts counting the elapsed time t from that point (step S11). Next, it is determined whether or not the smoke density Cs exceeds 2.5% / m (step S12). If the smoke density Cs does not exceed 2.5% / m (N in Step S12), the CPU 2a determines whether or not the elapsed time t is equal to or shorter than a predetermined time (for example, 7 minutes) (Step S12). S13). If the elapsed time t is less than or equal to a predetermined time (for example, 7 minutes) (Y in Step S13), the process returns to Step S12, and the elapsed time t is not less than or equal to the predetermined time (for example, 7 minutes) (N in Step S13). ), And then returns to step S3. On the other hand, if the smoke density Cs exceeds 2.5% / m in step S12 (Y in step S12), that is, if the smoke density Cs exceeds 2.5% / m within 7 minutes, then In step S18, it is determined that there is no fire.

  In step S4, if the CO concentration Cco is not less than 5 ppm and the smoke concentration Cs is not less than 2.5% (N in step S4), the CPU 2a starts the moving average process of the smoke concentration Cs. At the same time, counting of the time TB from the time when Cs ≧ 2.5% / m to Cs> (second preset smoke density, for example, 10% / m) is started (step S14). . The above-described moving average process calculates, for example, a 30-second moving average value Cs (n) of a smoke concentration converted value based on six sensor outputs from the smoke sensor 4 measured every 5 seconds.

  Next, the CPU 2a determines whether or not the previously calculated 30 second moving average value Cs (n-1) of the smoke density Cs is lower than the currently calculated 30 second moving average value Cs (n) (step S15). . If Cs (n-1) is not less than Cs (n) (N in Step S15), the process proceeds to Step S18, where it is determined that there is no fire. If Cs (n-1) is lower than Cs (n) (Y in step S15), the CPU 2a next determines whether or not the smoke density Cs exceeds 10% / m (step S16).

  If the smoke density Cs does not exceed 10% / m (N in step S16), the process returns to step S15. If the smoke density Cs exceeds 10% / m (Y in step S16), then the CPU 2a Determines whether or not the count of the time TB has reached a preset second time threshold, for example, 210 seconds (step S17). If the time TB count is 210 seconds or more (Y in step S17), the process proceeds to step S9, where it is determined that there is a fire, and if the time TB count is not 210 seconds or more (N in step S17). Then, the process proceeds to step S18, where it is determined that there is no fire.

  As described above, the CPU 2a determines fire / non-fire, and selects the fire determination process in step S10 or the non-fire determination process in step S19 according to the determination result.

  Next, in the fire determination process in step S10, as shown in the flowchart of FIG. 3, the CPU 2a first sets a delay time T = 0 seconds (step S101), and then the smoke density Cs is set in advance. It is determined whether or not a set first fire determination smoke threshold value, for example, 10% / m is exceeded (step S102).

  If the smoke density Cs exceeds 10% / m (Y in step S102), the CPU 2a then issues a warning for notifying the occurrence of a fire (step S103). That is, the CPU 2a generates an alarm signal and outputs the alarm signal to the alarm output unit 5. The alarm output unit 5 issues an alarm by sounding an alarm sound or displaying an alarm display. Moreover, the external output part 6 sends out the message | telegram etc. for alert | reporting a fire outbreak to an external system, a security center, etc. as needed.

  Next, the CPU 2a determines whether or not the smoke density Cs is less than 10% / m (step S104). If the smoke density Cs is not less than 10% / m (N in Step S104), the process returns to Step S103, and the alarm is continued. If the smoke density Cs is below 10% (Y in step S104), the CPU 2a then cancels the fire alarm (step S105), and then returns to step S101.

  On the other hand, if the smoke density Cs does not exceed 10% / m in step S102 (N in step S102), the CPU 2a determines whether the smoke density Cs falls below 2.5% / m. (Step S106). If the smoke density Cs is not less than 2.5% / m (N in Step S106), then the process returns to Step S102, and if the smoke density Cs is less than 2.5% / m (Y in Step S106), Next, the process returns to step S3 in FIG.

  Thus, in the fire determination process of step S10, it is determined whether or not the smoke density Cs exceeds 10% / m at the delay time T = 0 seconds, and if it exceeds, a fire alarm is issued.

  Next, in the non-fire determination process of step S19, as shown in the flowchart of FIG. 4, the CPU 2a first sets the delay time T = 45 seconds and starts the count t of the timer for delay time count ( Step S191). Next, the CPU 2a determines whether or not the smoke density Cs exceeds 10% / m (step S192).

  If the smoke density Cs exceeds 10% (Y in step S192), the CPU 2a next determines whether or not the timer count t is equal to or greater than T = 45 seconds (step S193). If the timer count t is equal to or greater than T = 45 seconds (Y in step S193), the CPU 2a then issues an alarm notifying the occurrence of a fire (step S194). That is, the CPU 2a generates an alarm signal and outputs the alarm signal to the alarm output unit 5. The alarm output unit 5 issues an alarm by sounding an alarm sound or displaying an alarm display. Moreover, the external output part 6 sends out the message | telegram etc. for alert | reporting a fire outbreak to an external system, a security center, etc. as needed.

  Next, the CPU 2a determines whether or not the smoke density Cs is less than 10% / m (step S195). If the smoke density Cs is not less than 10% / m (N in Step S195), the process returns to Step S194, and the alarm is continued. If the smoke density Cs is below 10% / m (Y in step S195), the CPU 2a then cancels the fire alarm (step S196), and then returns to step S191.

  On the other hand, if the smoke density Cs does not exceed 10% / m in step S192 (N in step S192), the CPU 2a determines whether the smoke density Cs falls below 2.5% / m. (Step S197). If the smoke density Cs is not less than 2.5% / m (N in Step S197), then the process returns to Step S192, and if the smoke density Cs is less than 2.5% / m (Y in Step S197), Next, the process returns to step S3 in FIG.

  In step S193, if the timer count t is not equal to or greater than T = 45 seconds (N in step S193), the CPU 2a then determines whether or not the smoke density Cs is below 10% / m. (Step S198). If the smoke density Cs is below 10% / m (Y in step S198), then the process returns to step S191. If the smoke density Cs is not less than 10% / m (N in Step S198), the CPU 2a then makes a second fire determination smoke threshold with a preset smoke density Cs, for example, 22.5% / m It is determined whether or not m exceeds (step S199). If the smoke density Cs exceeds 22.5% / m (Y in step S199), the process proceeds to step S194, where an alarm for notifying the occurrence of a fire is performed. If the smoke density Cs does not exceed 22.5% / m (N in step S199), then the process returns to step S193.

  Thus, in the non-fire determination process of step S17, the delay time T = 45 seconds is set, and after the delay time T = 45 seconds, if the smoke density Cs does not exceed 10% / m, it is determined that there is no fire. Fire alarm. However, if the smoke concentration Cs exceeds 10% / m after the delay time T = 45 seconds, it is determined that the fire is not a non-fire but a fire is issued, and the fire alarm is issued before the delay time 45 seconds. However, if the smoke density Cs exceeds 22.5% / m, a fire alarm is immediately issued. That is, even if it is determined that there is no fire in step S18 in FIG. 2 and the process proceeds to the non-fire determination process (FIG. 4) in step S19, the smoke density Cs is 10% / If it exceeds m, it is judged as a real fire and a fire alarm is issued. Therefore, not only false alarms during non-fire based on generation of temporary CO and smoke such as cigarettes, but also false alarms during non-fire based on CO and smoke generated during cooking are reduced. become.

  As is apparent from the above description, in the flowchart of FIG. 2, step S4 corresponds to the time determination means and the first determination means in the claims, and step S6 corresponds to the CO concentration increase determination means and the second determination means in the claims. Corresponding to the determining means, step S7 corresponds to the third determining means in the claims, step S5 corresponds to the first counting means in the claims, and step S8 corresponds to the fourth determining means in the claims. Step S9 corresponds to the fire determining means in the claims, Step S18 corresponds to the non-fire determining means in the claims, Steps S11 to S13 correspond to the fifth determining means in the claims, and Step S15 is the claim. Step S14 corresponds to the second counting means in the claims. And, step S17 is a process corresponding to the seventh judging means in claims. In the flowchart of FIG. 3, step S102 corresponds to the eighth determining means in the claims, and step S103 is processing corresponding to the notifying means in the claims. 4, step S191 corresponds to the delay time setting means in the claims, step S192 corresponds to the ninth determination means in the claims, and step S199 corresponds to the tenth determination means in the claims. It has become.

  Thus, according to the present invention, it is possible to effectively distinguish between a fire and a non-fire, reliably notify the fire, and particularly reduce false alarms due to cooking.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

It is a block diagram which shows the structure of the disaster alarm device using the fire / non-fire discrimination apparatus which concerns on embodiment of this invention. It is a flowchart which shows the detailed operation | movement of the fire detection process of the fire alarm device of FIG. It is a flowchart which shows the detailed operation | movement of the fire detection process of the fire alarm device of FIG. It is a flowchart which shows the detailed operation | movement of the fire detection process of the fire alarm device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire alarm device 2 Microcomputer 2a CPU (Time point determination means, CO concentration increase determination means, Smoke concentration increase determination means, First determination means, Second determination means, Third determination means, First count means, First count means 4 determining means, fire determining means, non-fire determining means, fifth determining means, sixth determining means, second counting means, seventh determining means, eighth determining means, ninth determining means, (Tenth determination means, delay time setting means, part of notification means)
3 CO sensor 4 Smoke sensor 5 Alarm output part (part of the notification means)
7 Memory part

Claims (8)

A fire / non-fire discrimination device that distinguishes between fire and non-fire,
A CO sensor for detecting the CO concentration;
A smoke sensor for detecting smoke concentration;
When the CO concentration detected at each predetermined detection timing by the CO sensor becomes equal to or higher than a first set CO concentration, and the smoke concentration detected at the predetermined detection timing by the smoke sensor are the first set smoke concentration. First determination means for determining which of the time points exceeding
Second determination means for determining whether or not the CO concentration continuously increases;
Third determination means for determining whether or not the smoke density detected at each predetermined detection timing by the smoke sensor exceeds a first set smoke density;
When it is determined by the first determination means that the CO concentration has reached the first set CO concentration first, the smoke concentration becomes the first set smoke concentration by the third determination means from that time. First counting means for counting a first elapsed time until it is determined that the time has exceeded,
When it is determined by the second determination means that the CO concentration is continuously increasing, the first elapsed time is the time that the CO concentration reaches the first set CO concentration and the smoke concentration A fourth determination means for determining whether or not a time difference with respect to a time until the first set smoke density is reached is greater than or equal to a predetermined first time threshold value;
Fire determining means for determining a fire when the fourth determining means determines that the first elapsed time is equal to or greater than the first time threshold;
Non-fire determination means for determining non-fire when the fourth determination means does not determine that the first elapsed time is equal to or greater than the first time threshold;
A fire / non-fire discrimination device characterized by comprising: In the fire / non-fire discrimination device according to claim 1,
  If it is not determined by the second determination means that the CO concentration is continuously increasing, whether or not the smoke concentration has reached the first set smoke concentration within a predetermined time from that point. And a fifth determination means for determining
  The non-fire determining means further determines that it is non-fire when the fifth determining means determines that the smoke concentration has reached the first set smoke concentration within a predetermined time.
  A fire / non-fire discrimination device. In the fire / non-fire discrimination device according to claim 1 or 2,
  Sixth determination means for determining whether or not the smoke concentration continuously increases;
  When it is determined by the first determination means that the smoke density has first reached the first set smoke density, the smoke density is set higher than the first set smoke density from the first set smoke density. A second counting means for counting a second elapsed time until reaching the set second smoke density,
  When it is determined by the sixth determination means that the smoke density is continuously rising, the second elapsed time counted by the second count means is the smoke density of the first A seventh determination means for determining whether or not the second elapsed time until the second set smoke density is reached from the set concentration is equal to or greater than a predetermined second time threshold;
  The fire determination means further determines a fire when the seventh determination means determines that the second elapsed time is equal to or greater than the second time threshold,
  The non-fire determining means further determines as non-fire when the seventh determining means does not determine that the second elapsed time is equal to or greater than the second time threshold.
  A fire / non-fire discrimination device. In the fire / non-fire discrimination device according to claim 3,
  The non-fire determining means further determines a non-fire if the sixth determining means does not determine that the smoke concentration is continuously increasing.
  A fire / non-fire discrimination device. A fire alarm using the fire / non-fire discrimination device according to any one of claims 1 to 4. A fire alarm using the fire / non-fire discrimination device according to any one of claims 1 to 4,
  An eighth determination means for determining whether or not the smoke concentration has exceeded a predetermined first fire determination smoke threshold when the fire / non-fire determination device determines that a fire has occurred;
  In the case where it is determined by the eighth determination means that the smoke concentration exceeds the first fire determination smoke threshold value, a notification means for informing a fire alarm;
  A fire alarm device comprising: The fire alarm according to claim 6,
  A delay time setting means for setting a predetermined delay time when it is determined as a non-fire by the fire / non-fire determination device;
  And ninth determination means for determining whether or not the smoke concentration exceeds the first fire determination smoke threshold over the predetermined delay time set by the delay time setting means,
  The notification means further notifies a fire alarm when the ninth determination means determines that the smoke concentration exceeds the first fire determination smoke threshold.
  A fire alarm characterized by that. The fire alarm according to claim 7,
  A first determination is made as to whether or not the smoke concentration detected at each predetermined detection timing by the smoke sensor is higher than the first fire determination smoke threshold and exceeds a predetermined second fire determination smoke threshold. 10 determination means,
  The notification means determines that the smoke concentration exceeds the second fire determination smoke threshold value by the tenth determination means during the elapse of the predetermined delay time set by the delay time setting means. In case of fire alarm
  A fire alarm characterized by that.

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