JP4326463B2 - Alarm device - Google Patents

Description

The present invention comprises at least one fire environment state detection means for detecting a fire environment state that changes due to a fire,
Determining means for determining that the output related value related to the output of at least one fire environment state detecting means is equal to or greater than a predetermined determination threshold;
Alarm means for outputting an alarm according to the determination result of the determination means,
The present invention relates to an alarm device that outputs a fire countermeasure command signal to the outside when a fire condition is judged by the judging means.

  A fire alarm device configured as an alarm device as described above detects a fire environment state related to a fire by the fire environment state detection unit, and an output related value related to the output of the fire environment state detection unit is determined by the determination unit. It is determined that the above-mentioned full-scale fire state or the above-mentioned initial fire state has become a predetermined determination threshold or more, and an alarm such as a full-scale fire alarm or an initial fire alarm is output according to the determination result of the determination unit by the alarm unit It is configured as follows.

  In addition, the alarm device includes a plurality of fire environment states including a fire sensor that detects smoke and heat as the fire environment state, and a gas sensor that detects the concentration of carbon monoxide that is a fire-generating gas as the fire environment state. There is known an alarm device that includes a detection unit and determines a plurality of fire states such as a full-scale fire state and an initial fire state based on detection results of the plurality of fire environment state detection units (for example, Patent Document 1). See).

In addition, in this way, in an alarm device that determines a full-scale fire condition and an initial fire condition and outputs an alarm according to the determination result, when the full-scale fire condition or the initial fire condition is determined, There is a case where a fire countermeasure command signal for instructing to take a countermeasure is output to the outside.
For example, the above fire countermeasure command signal is output to a gas company or a passerby by outputting the above fire countermeasure command signal to a center device of a gas supply company or a security company or an alarm device installed outdoors via a communication means such as the Internet. In some cases, the fire control command signal is output to a shutoff valve capable of shutting off gas supply to a fire source such as a stove to shut off the shutoff valve.

JP 2000-132761 (FIG. 3 etc.)

  The conventional alarm device configured to output the fire countermeasure command signal as described above to the outside when the fire condition is erroneously judged by the judging means in spite of the fact that no fire has occurred, or a small scale Even when a fire has occurred but a person who has recognized the alarm from the alarm means performs fire extinguishing activities, etc., and it is resolved, the fire countermeasure command signal is output immediately when the judgment means determines the fire condition. For example, a gas supply company or security company that has received a fire report from the output of the fire countermeasure command signal spends unnecessary work such as confirmation of fire occurrence or fire fighting, There is a problem that the gas supply to the stove is unnecessarily cut off.

  On the other hand, when a fire actually occurs and continues, it is desirable to output a fire countermeasure command signal as quickly as possible when the determination means determines a fire condition.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an alarm device that can appropriately output a fire countermeasure command signal according to the situation when a fire state is determined. It is in.

The alarm device according to the present invention for achieving the above object comprises at least one fire environment state detection means for detecting a fire environment state that changes due to a fire,
The fire environment state detection means includes a fire sensor that detects smoke, heat, or flame as the fire environment state, and a gas sensor that detects the concentration of fire-generated gas generated by the fire as the fire environment state,
Determining means for determining that the output related value related to the output of at least one fire environment state detecting means is equal to or greater than a predetermined determination threshold;
Alarm means for outputting an alarm according to the determination result of the determination means,
An alarm device that outputs a fire countermeasure command signal to the outside when the determination unit determines a fire condition,
The determination means determines that the output related value of the fire environment state detection means is equal to or greater than an initial fire determination threshold as an initial fire state, and the output related value of the fire environment state detection means is the initial fire that a large full-scale fire determination threshold or higher than the determination threshold value is intended to determine the full-scale fire condition,
The fire sensor output related value that is the output related value of the fire sensor is equal to or greater than the fire sensor initial fire determination threshold as the initial fire determination threshold, and the gas sensor output related value that is the output related value of the gas sensor is the initial fire determination threshold. It is determined as the initial fire state that the gas sensor has reached or exceeded the initial fire determination threshold, and when the fire sensor output related value is equal to or greater than the fire sensor full fire determination threshold as the full fire determination threshold, Judgment,
The fire sensor initial fire determination threshold when the gas sensor output related value is greater than or equal to the gas sensor initial fire determination threshold, and the fire sensor initial determination threshold when the gas sensor output related value is less than the gas sensor initial fire determination threshold. Set it too small,
Long when the signal output delay time from the start of the continuous determination of the pre-Symbol fire state to the output of the fire protection command signal, to determine the initial fire condition than when determining the full fire condition In this form, it is changed in accordance with an output related value of at least one of the fire environment state detection means.
It should be noted that the output related value of the fire environment state detection means is the fire environment state detection means output, the increase rate of the output, or the duration of the output continuously exceeding the set output, etc. It can be obtained as a value that increases or decreases with the output state of the environmental state detection means.

According to the first characteristic configuration, the signal output delay time from when the fire condition is continuously determined by the determining means to when the fire countermeasure command signal is output is calculated as an output related value of the fire environment state detecting means. Therefore, the fire countermeasure command signal can be appropriately output according to the situation.
That is, when the output-related value of the fire environment state detection means is large, a fire has actually occurred, or the fire that has occurred is a relatively large scale that cannot be dealt with by a person who has recognized the alarm of the alarm means. By determining that the signal output delay time is zero or shortened, it is possible to output a fire countermeasure command signal for instructing to take some countermeasure against the fire as quickly as possible. .
On the other hand, if the output-related value of the fire environment state detection means is small, there is no fire, or the fire that has occurred is a relatively small one that can be dealt with by a person who has recognized the alarm means. Therefore, by slightly increasing the signal output delay time, unnecessary output of the fire countermeasure command signal when the fire is not occurring or after the fire is extinguished can be suppressed.

Furthermore , when the determination means determines the initial fire state and the full-scale fire state using the output-related values of the fire environment state detection means, the signal output delay time when the initial fire state is determined is set to the full-scale fire. When the actual fire condition is judged by the judgment means, the fire countermeasure command signal is output to the outside as quickly as possible, and when the initial fire condition is judged by the judgment means. Unnecessary output of the fire countermeasure command signal when fire is not occurring or after the fire is extinguished can be suppressed.

Furthermore, the determination means can appropriately determine the full fire state and the initial fire state using both the fire sensor output related value and the gas sensor output related value as output related values.
In other words, if the fire sensor output related value is equal to or greater than the fire sensor full-scale fire determination threshold, it is determined that there is a high possibility that a fire has occurred, and the fire sensor output-related value is determined as a full fire state regardless of the gas sensor output related value. On the other hand, if the fire sensor output related value is equal to or higher than the fire sensor initial fire determination threshold set smaller than the fire sensor full-scale fire determination threshold, the gas sensor output related value is equal to or higher than the gas sensor initial fire determination threshold. Only when there is a possibility that a fire has occurred, it can be determined as an initial fire state.
Further, the determination unit is configured to determine the fire sensor initial fire determination threshold when the gas sensor output related value is equal to or greater than the gas sensor initial fire determination threshold, and the gas sensor output related value when the gas sensor output related value is less than the gas sensor initial fire determination threshold. Since it is set smaller than the fire sensor initial determination threshold value, the initial fire state can be determined with higher sensitivity as the gas sensor output related value is larger.

The second characteristic configuration of the alarm device according to the present invention includes an absent state detecting means for detecting an absent state where no person is present,
The signal output delay time when the absence state is detected by the absence state detection unit is shorter than when the absence state is not detected by the absence state detection unit.

According to the second characteristic configuration, the signal output delay time from when the fire condition is continuously determined by the determination means until the fire countermeasure command signal is output is determined according to the detection result of the absence state detection means. Therefore, the fire countermeasure command signal can be appropriately output according to the presence or absence of a person.
That is, when the absence state is detected by the absence state detection means, it is determined that there is no person who can recognize the alarm by the alarm means and confirm the fire and take measures against the fire. By reducing the output delay time to 0 or short, a fire countermeasure command signal for instructing to take some countermeasure against the fire can be output to the outside as quickly as possible.
On the other hand, when the absence state is not detected by the absence state detection means, it is determined that there is a person who can recognize the alarm by the alarm means and can confirm the fire and cope with the fire. By slightly extending the delay time, it is possible to suppress unnecessary output of the fire countermeasure command signal when no fire actually occurs or after the fire is extinguished .

In addition to the first or second feature configuration, the third feature configuration of the alarm device according to the present invention outputs the fire countermeasure command signal to an external system to notify the occurrence of a fire, or gas to the fire source The fire countermeasure command signal is output to a shutoff valve capable of shutting off the supply of power to shut off the shutoff valve.

According to the third characteristic configuration described above, a shutoff valve capable of shutting off gas supply to a center device of a gas supply company or a security company, an external system such as an alarm installed outdoors, or a fire source such as a stove On the other hand, it is possible to appropriately output a fire countermeasure command signal according to the situation, to notify the gas company or a passerby of the occurrence of a fire, or to automatically shut off the shut-off valve.
Even in such a configuration, if the output-related value of the fire environment state detection means is large, a fire is reported to the gas company or a passerby as quickly as possible, or the shutoff valve is automatically shut off. On the other hand, when the output-related value of the fire environment state detection means is small, useless notification or useless shut-off of the shutoff valve can be suppressed.

An embodiment of an alarm device according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the alarm device 10 includes at least one fire environment state detection unit 11 that detects a fire environment state that changes due to the occurrence of a fire, and includes at least one fire environment state detection unit. 11, a determination unit 12 that determines that the output related value related to the output of 11 is equal to or greater than a predetermined determination threshold value as a fire state, an alarm unit 13 that outputs an alarm according to the determination result of the determination unit 12, And a signal output means 14 for outputting a fire countermeasure command signal to the outside when the fire condition is determined. For example, in this embodiment, the fire is caused by the cooked food on the stove 2 installed on the side wall 4 of the kitchen in the home. It is configured to determine the occurrence of F and output a fire alarm or the like.

  The alarm device 10 detects, as the fire environment state detection means 11, a fire sensor 11 a that detects smoke, heat, or flame as a fire environment state, and a concentration of a fire-generated gas generated by a fire F as a fire environment state. Gas sensor 11b is provided.

The fire sensor 11a senses smoke from the fire F and emits an output related to the concentration of the smoke, a heat sensor senses heat from the fire F and emits an output related to the amount of heat and temperature, It is configured as a flame sensor or the like that senses light such as infrared rays or ultraviolet rays emitted by a flame due to the fire F and emits an output related to the intensity of the light.
Therefore, it can be determined that the greater the output of the fire sensor 11a, the increase rate per unit time, and the like, the higher the possibility that a fire F has occurred.

On the other hand, the gas sensor 11b is configured as a sensor that detects the concentration of at least one of carbon monoxide, hydrogen, aldehydes, ketones, carbon dioxide, hydrogen chloride, and hydrogen cyanide as a fire generating gas.
For example, carbon monoxide is produced by incomplete combustion caused by fire F, and hydrogen, aldehydes, and ketones are produced as components generated before ignition and intermediate products by fire F, and are produced by carbon dioxide, chloride. Hydrogen and hydrogen cyanide are produced as a combustion product from the fire F, and further, the amount produced is small during normal cooking and smoking.
Therefore, it can be determined that the greater the output of the gas sensor 11b, the increase rate per unit time, and the like, the higher the possibility that a fire F has occurred.

  Further, as the gas sensor 11b as described above, a known constant potential electrolytic type, an electromotive force detection type, a redox mixed potential detection type, a type detecting an electrode reaction current on an electrolyte, or a metal oxide semiconductor type Or a known gas sensor such as a catalytic combustion type can be used. For example, although the description is omitted for details, as a gas sensor for detecting the concentration of carbon monoxide, a semiconductor type gas sensor using a sensitive part made of a tin oxide semiconductor or an indium oxide semiconductor as a metal oxide semiconductor, or an electrolytic An electrochemical gas sensor that detects the current generated by the reaction of carbon monoxide on an electrode provided on an electrolyte such as a liquid or a solid electrolyte can be used. A semiconductor type or catalytic combustion type gas sensor using a sensitive part made of a tin oxide semiconductor or the like can be used as a physical semiconductor.

  The determination means 12 outputs the output of the fire sensor 11a as the fire sensor output related value a which is the output related value of the fire sensor 11a and the output of the gas sensor 11 as the gas sensor output related value b which is the output related value of the gas sensor 11b. And whether or not one or both of the fire sensor output related value a and the gas sensor output related value b is equal to or greater than a predetermined determination threshold is determined as a fire state where a fire has occurred. It is configured.

  That is, the determination means 12 will be described in detail later, but the output related value of the fire environment state detection means 11 is assigned to the data map shown in FIG. It is determined that one or both of the gas sensor output related values b is equal to or greater than the initial fire determination threshold value as the determination threshold value as the initial fire state (Y), and the output related value of the fire environment state detection means 11 is the initial fire value. It is determined as a full-scale fire state (Z) that it is equal to or greater than a full-scale fire determination threshold as a determination threshold greater than the determination threshold. Further, the determination means 12 determines that the gas sensor output related value b is equal to or higher than the gas abnormality determination threshold value as the determination threshold value when the initial fire state (Y) and the full-scale fire state (Z) are not determined. It is determined as an abnormal state (X), and it is determined that there is no abnormality in particular (W) that the gas abnormal state (X), the initial fire state (Y), and the full-scale fire state (Z) are not determined. Is configured to do.

  Hereinafter, the determination method of the various states by the determination unit 12 will be described in detail with reference to FIG.

(Judgment of full-scale fire condition)
The determination unit 12 determines that the fire sensor output related value a is equal to or greater than a predetermined fire sensor full fire determination threshold A4 set as the full fire determination threshold as a full fire state (Z).
When the fire sensor output related value a is a temperature obtained from the amount of heat detected by the heat sensor as the fire sensor 11a, the fire sensor full-scale fire determination threshold A4 is set to about 65 ° C., for example. Thus, the full-scale fire state (Z) can be appropriately determined.

(Determination of initial fire condition)
When the fire sensor output related value a is less than the fire sensor full fire determination threshold A4 for determining the full fire state (Z), the determination means 12 uses the fire sensor output related value a as the initial fire determination threshold. The predetermined fire sensor initial fire determination threshold A3 (where A3 <A4) is set or greater and the gas sensor output related value b is greater than or equal to the predetermined gas sensor initial fire determination threshold B1 set as the initial fire determination threshold. The predetermined gas sensor in which the fire sensor output related value a is equal to or greater than the predetermined fire sensor initial fire determination threshold A2 (where A2 <A3) set as the initial fire determination threshold and the gas sensor output related value b is set as the initial fire determination threshold In addition, the fire sensor output related value a is set as the initial fire determination threshold value B2 when the initial fire determination threshold value B2 is reached. The predetermined fire sensor initial fire determination threshold A1 (A1 <A2) or more and the gas sensor output related value b is equal to or higher than the predetermined gas sensor initial fire determination threshold B3 (B3> B2) set as the initial fire determination threshold. Is determined as an initial fire state (Y).

In addition, when the gas sensor output related value b is relatively large as described above (for example, when the gas sensor output related value b is equal to or greater than the gas sensor initial fire determination threshold B3), the initial fire state with respect to the fire sensor output related value a. When the fire sensor initial fire determination threshold A1 for determining (Y) is the gas sensor output related value b being medium (for example, the gas sensor output related value b is equal to or greater than the gas sensor initial fire determination threshold B2 and the gas sensor initial fire determination threshold B3 Is less than the fire sensor initial fire determination threshold A2 for determining the initial fire state (Y) with respect to the fire sensor output related value a.
Further, when the gas sensor output related value b is relatively small (for example, the gas sensor output related value b is within the range of the gas sensor initial fire determination threshold B1 or more and less than the gas sensor initial fire determination threshold B2). In some cases, the fire sensor output related value a is set smaller than the fire sensor initial fire determination threshold A3 for determining the initial fire state (Y).
That is, as the gas sensor output related value b is larger, the initial fire state (Y) can be determined with higher sensitivity.

  In addition, when the said fire sensor output related value a is the temperature calculated | required by the calorie | heat amount detected with the heat sensor as the fire sensor 11a, the fire sensor output related value which is a judgment object of the said initial fire state (Y) The fire sensor initial fire determination threshold A1 for a is set to, for example, about 40 ° C., the fire sensor initial fire determination threshold A 2 is set, for example, to about 50 ° C., and the fire sensor initial fire determination threshold A 3 is set to 55 ° C. . On the other hand, when the gas sensor output related value b is the concentration of carbon monoxide as the fire-generated gas detected by the carbon monoxide sensor as the gas sensor 11b, the initial fire state (Y) is determined. The gas sensor initial fire determination threshold B1 for the gas sensor output related value b is set to about 100 ppm, for example, the gas sensor initial fire determination threshold B2 is set to about 200 ppm, and the gas sensor initial fire determination threshold B3 is set to about 550 ppm, for example. To do. And the initial fire state (Y) can be appropriately determined by setting various determination thresholds as described above.

(Determination of abnormal gas state)
When the determination unit 12 has not determined the initial fire state (Y) and the full-scale fire state (Z), it is determined that the gas sensor output related value b is equal to or greater than the gas abnormality determination threshold B ′ as a determination threshold. It is determined as the state (X).
When the gas sensor related value b is the concentration of carbon monoxide as the fire-generated gas detected by the carbon monoxide sensor as the gas sensor 11b, the gas sensor that is the object of determination of the abnormal gas state (X) By setting the gas abnormality determination threshold B ′ for the output related value b to, for example, about 200 ppm, the gas abnormality state (X) can be appropriately determined.

Further, the gas abnormality determination threshold B ′ for determining the gas abnormal state (X) can be set to the same value as the gas sensor initial fire determination threshold B2 for determining the initial fire state (Y) described above.
Therefore, when the fire sensor output related value a is less than the fire sensor full-scale fire determination threshold A4 and the fire sensor output related value a is relatively larger than the fire sensor initial fire determination threshold A2, the determination unit 12 When the gas sensor related value b is equal to or greater than the gas sensor initial fire determination threshold B2, it is determined as the initial fire state (Y), and when the fire sensor output related value a is relatively small, less than the fire sensor initial fire determination threshold A1, It is determined that the gas sensor related value b is equal to or greater than the gas sensor initial fire determination threshold B2 as a gas abnormal state (X).

Next, a detailed configuration of the alarm unit 13 will be described.
For example, when the determination unit 12 determines the abnormal gas state (X), the alarm unit 13 notifies the fact that the concentration of the fire-generated gas is abnormally high and alerts the user to ventilate, for example, “ When the voice guidance saying “Open the window and ventilate is dangerous.” And the judgment means 12 determines the initial fire condition (Y), As an alarm for prompting confirmation of the situation, for example, when a voice guidance “please check the fire source” is output and the determination means 12 determines the full fire state (Z), the full fire state As an alarm for notifying that it is (Z), for example, a voice guidance “fire alarm device has been activated. Please check” can be output.

Next, a detailed configuration of the signal output unit 14 will be described.
The signal output means 14 outputs a fire countermeasure command signal related to the determination result by the determination means 12 to the outside when the determination means 12 determines the full fire state or the initial fire state, and takes some measures against the fire. Is configured to command.

Referring also to FIG. 1, the signal output means 14 is a center device 23 (an example of an external system) installed in a gas supply company, a security company or the like when the determination means 12 determines a full fire condition or an initial fire condition. In addition, the fire countermeasure command signal can be transmitted through the communication device 21 and the communication network 22 such as the Internet to notify the occurrence of the fire.
The signal output means 14 outputs the fire countermeasure command signal to an emergency rotating lamp 24 or a speaker 25 (an example of an external system) installed outdoors, and activates it to notify an outdoor passerby about the occurrence of a fire. Can be configured to.
Further, the signal output means 14 sends the fire countermeasure command signal to the shutoff valve 26 that can shut off the supply of gas to a fire source such as a stove, when the judging means 12 judges a full fire condition or an initial fire condition. It can be configured to output and shut off the shut-off valve 26.
As the shutoff valve 26, a built-in gas meter (not shown) can be used.

Further, the signal output means 14 outputs a fire countermeasure command signal when the determination means 12 continues to determine a fire state with a signal output delay time of zero or more, and appropriately outputs a fire countermeasure command signal according to the situation. In order to output, the signal output delay time from when the determination unit 12 starts the continuous determination of the fire state to when the fire countermeasure command signal is output is set as an output related value of at least one fire environment state detection unit 11. It is configured to change accordingly.
Next, the first to third embodiments relating to the process of changing the signal output delay time of the signal output means 14 will be described.

(First embodiment)
As shown in FIG. 4, the signal output means 14 in the first embodiment determines whether or not the determination means 12 continues to determine the full-scale fire state and the initial fire state (step # 11). If it is determined that the determination is continuing, the fire condition continuation determination time T, which is the elapsed time during which the determination is continued, is measured (step # 12). If it is determined that the fire has been interrupted, the fire state continuation determination time T is reset to 0 (step # 13).

  Further, when it is determined in step # 11 that the determination of the fire state is continuing, the output related value of at least one of the fire environment state detection means 11 that is the fire sensor 11a and the gas sensor 11b is a predetermined set threshold value. It is determined whether or not it is greater than or equal to X (step # 14).

  Then, when the output related value is equal to or larger than the set threshold value X, the signal output means 14 sets the signal output delay time t to t0 that is relatively short (eg, 0 minutes) (step # 15). Conversely, if the output-related value is less than the set threshold value X and is relatively small, the signal output delay time t is set to a relatively long (for example, 2 minutes) t1 (step # 16). The time t is changed according to the output related value of the fire environment state detection means 11.

  The fire condition continuation determination time T after the determination of the fire condition by the determination means 12 is not less than the signal output delay time t that is changed according to the output related value of the fire environment condition detection means 11 as described above. (Step # 17). When the fire state continuation determination time T is equal to or longer than the signal output delay time t, the above-described fire countermeasure command signal is output (step # 18).

  And by changing the signal output delay time t as described above, when the output related value of the fire environment state detection means 11 is large, the signal output delay time is set to 0 or short, and as quickly as possible. When a fire countermeasure command signal for instructing to take some measures against the fire is output to the outside, and the output related value of the fire environment state detection means 11 is small, the signal output delay time is slightly increased. Thus, it is possible to suppress unnecessary output of the fire countermeasure command signal when no fire has occurred or after the fire is extinguished.

In addition, the signal output delay time t is changed according to the output related value of the fire environment state detection means 11 used as a determination target for the fire state, so that it is changed according to the reliability of the fire occurrence and the scale of the fire. A fire countermeasure command signal can be output after the signal output delay time.
That is, when the determination unit 12 determines the fire state based on one of the output related values of the fire sensor 11a and the gas sensor 11b, the signal output delay time t is set according to the same output related value, for example, the larger the output related value is. It can be changed to be shorter.

On the other hand, by changing the signal output delay time t according to the output related value of the fire environment state detecting means 11 different from the determination target for the fire state, the output related value of another fire environment state detecting means 11 is changed. The fire countermeasure command signal can be output after the signal output delay time that has been objectively changed.
That is, when the determination unit 12 determines the fire state based on one of the output related values of the fire sensor 11a and the gas sensor 11b, the signal output delay time t is set according to the other output related value, for example, the other output related value. It can be changed so that the larger the value, the shorter.

(Second embodiment)
As shown in FIG. 5, the signal output means 14 in the second embodiment has a longer signal output delay time when the determination means 12 determines the initial fire state than when the determination means 12 determines the full fire condition. The fire environment state detection means 11 is configured to change according to the output related value.

  That is, the signal output unit 14 determines whether or not the determination unit 12 continues to determine the full fire state and the initial fire state (step # 21), and determines that the determination of the fire state is continuing The fire condition continuation determination time T, which is the elapsed time during which the fire condition is continuously determined, is measured (step # 22). Conversely, if it is determined that the fire condition determination has been interrupted, The fire state continuation determination time T is reset to 0 (step # 23).

  Further, when it is determined in step # 21 that the determination of the fire condition is continuing, it is determined whether the determination means 12 has determined the full fire condition or the initial fire condition has been determined (step #). 24).

  When the full-scale fire state is determined, the signal output means 14 sets the signal output delay time t to t0 that is relatively short (for example, 0 minutes) (step # 25), and conversely, the initial fire. If the state is determined, the signal output delay time t is set to t1 which is relatively long (for example, 2 minutes) (step # 26), and the signal output delay time t of the fire environment state detection means 11 is set. Change according to the output related value.

  Then, it is determined whether or not the fire state continuation determination time T after the determination of the fire state by the determination means 12 is equal to or longer than the signal output delay time t that is changed according to the full fire state or the initial fire state. (Step # 27) When the fire state continuation determination time T becomes equal to or longer than the signal output delay time t, the above-described fire countermeasure command signal is output (step # 28).

  Then, when the full-scale fire condition is determined by changing the signal output delay time t as described above, the signal output delay time is reduced to 0 or short, so that the fire can be dealt with as quickly as possible. If a fire countermeasure command signal is output to the outside to instruct to take some countermeasures and the initial fire condition is judged, a fire has occurred by slightly increasing the signal output delay time. Unnecessary output of the fire countermeasure command signal when there is no or after extinction can be suppressed.

(Third embodiment)
In the third embodiment, as shown in FIG. 6 and FIG. 7, the absence state detection means 15 for detecting the absence state in which no person exists is provided, and the signal output means 14 is the absence state detection means 15. The signal output delay time when detecting the absence is shorter than when the absence state is not detected by the absence state detecting means 15.

That is, referring to FIG. 6, the alarm device 10 is absent from the fire environment state detection means 11 configured by the fire sensor 11a, the gas sensor 11b, etc. described above to detect the absence state in which no person is present. State detection means 15 is provided.
The absence state detection means 15 is configured to detect that the presence of a person has not been sensed continuously for a predetermined time by a known human sensor 15a as an absence state.
The absence state detection means 15 detects the absence state when, for example, an absence button (not shown) is pressed, and detects the absence state when the absence button is released by pressing the absence button again. It is possible to appropriately modify the configuration such that it is determined that the person is present in the installation space by canceling.

  Then, referring to FIG. 7, the signal output means 14 determines whether or not the determination means 12 continues to determine the fire condition such as the full-scale fire condition or the initial fire condition (step # 31), and the fire condition If it is determined that the fire condition continues, the fire condition continuation determination time T, which is the elapsed time during which the fire condition is continuously determined, is measured (step # 32). If it is determined that the determination has been interrupted, the fire state continuation determination time T is reset to 0 (step # 33).

  Further, when it is determined in step # 31 that the determination of the fire state continues, it is determined whether or not the absence state is detected by the absence state detection means 15 (step # 34).

  When the absence state is determined, the signal output means 14 sets the signal output delay time t to a relatively short (eg, 0 minutes) t0 (step # 35), and conversely, determines the absence state. If not, the signal output delay time t is set to t1 that is relatively long (for example, 2 minutes) (step # 26), and the signal output delay time t is set according to the output related value of the absence state detection means 15. To change.

  Then, it is determined whether or not the fire state continuation determination time T after the determination by the determination means 12 is equal to or longer than the signal output delay time t that is changed depending on whether or not the absence state exists ( Step # 27) When the fire state continuation determination time T is equal to or longer than the signal output delay time t, the above-described fire countermeasure command signal is output (step # 28).

  Then, by changing the signal output delay time t as described above, in the absence state, by taking the signal output delay time 0 or shortening, some measures are taken against the fire as quickly as possible. A fire countermeasure command signal for commanding to be applied is output to the outside, and when it is not absent, the signal output delay time is slightly lengthened, so that a fire countermeasure command is given when there is no fire or after extinction Unnecessary output of signals can be suppressed.

  Note that the change in the signal output delay time depending on whether or not it is in the absence state, the signal output delay time corresponding to the output related value of the fire environment state detection means 11 as in the first or second embodiment described above. You may implement in combination with a change.

[Another embodiment]
(1) In the above embodiment, a plurality of fire environment state detection means 11 of the fire sensor 11a and the gas sensor 11b are provided, and another fire environment state detection means 11 is provided, and the output of the fire environment state detection means 11 is provided. It may be determined that the fire condition is an abnormal gas condition using the related value.

(2) Although the fire sensor 11a and the gas sensor 11b are provided as the fire environment state detection means 11 in the above embodiment, another form of fire environment state such as an odor sensor that detects odor generated by a fire. Fire environment state detecting means for detecting the above may be provided.

(3) In the above embodiment, the output of the fire sensor 11a and the output of the gas sensor 11b are used as the fire sensor output related value a and the gas sensor output related value b. An increase rate or the like, an increase rate per unit time of the output of the gas sensor 11b, or the like may be used as the fire sensor output related value a or the gas sensor output related value b.

(4) In the above embodiment, the determination unit 12 is configured to determine the fire state, the abnormal gas state, etc. in the form in which the output-related value of the fire environment state detection unit 11 is assigned to the data map shown in FIG. Separately, instead of the data map, a predetermined determination processing flow for determining a fire state or an abnormal gas state based on the output-related value of the fire environment detection means 11 may be constructed.

(5) In the above embodiment, the signal output means 14 for outputting the fire countermeasure command signal is a signal from when the determination means 12 starts the continuous determination of the fire condition until the fire countermeasure command signal is output. Although the output delay time is configured to be changed according to the output related value of the fire environment state detection means 11, a means for changing the signal output delay time is configured separately from the signal output means 14. It doesn't matter.

(6) In the above embodiment, the determination unit 12 is configured to determine that the output related value related to the output of the at least one fire environment state detection unit 11 is equal to or greater than a predetermined determination threshold as a fire state. In determining the fire state in this way, a determination delay time is set, and it is configured to determine that the output-related value has continuously exceeded a predetermined determination delay time as a fire state or the like. It doesn't matter.
Further, the determination delay time may be a constant value, but is changed according to, for example, the output related value of at least one fire environment state detection unit 11 as in the signal output delay time described so far. You can also In addition, for the purpose of promptly determining the fire state and suppressing unnecessary output of the fire countermeasure command signal, the determination delay time is desirably set smaller than the signal output delay time.

Diagram showing the installation status of the alarm device Schematic configuration diagram of alarm device Explanation showing the judgment status of fire and abnormal gas The flowchart which shows the change process of the signal output delay time in 1st Example The flowchart which shows the change process of the signal output delay time in 2nd Example. Schematic configuration diagram of alarm device in third embodiment Flow chart showing signal output delay time changing process in the third embodiment

Explanation of symbols

10: Alarm device 11: Fire environment state detection means 11a: Fire sensor 11b: Gas sensor 12: Determination means 13: Alarm means 14: Signal output means 15: Absence state detection means a: Fire sensor output related value (output related value)
b: Gas sensor output related value (output related value)
t: Signal output delay time A1, A2, A3: Fire sensor initial fire determination threshold A4: Fire sensor full-scale fire determination threshold B1, B2, B3: Gas sensor initial fire determination threshold B ': Gas abnormality determination threshold F: Fire Y: Initial Fire state Z: Full fire state

Claims (3)

At least one fire environment state detection means for detecting a fire environment state that changes due to a fire is provided,
The fire environment state detection means includes a fire sensor that detects smoke, heat, or flame as the fire environment state, and a gas sensor that detects the concentration of fire-generated gas generated by the fire as the fire environment state,
Determining means for determining that the output related value related to the output of at least one fire environment state detecting means is equal to or greater than a predetermined determination threshold;
Alarm means for outputting an alarm according to the determination result of the determination means,
An alarm device that outputs a fire countermeasure command signal to the outside when the determination unit determines a fire condition,
The determination means determines that the output related value of the fire environment state detection means is equal to or greater than an initial fire determination threshold as an initial fire state, and the output related value of the fire environment state detection means is the initial fire It is determined as a full-scale fire condition that it is equal to or greater than the full-scale fire determination threshold that is greater than the determination threshold ,
The fire sensor output related value which is the output related value of the fire sensor is equal to or greater than the fire sensor initial fire determination threshold as the initial fire determination threshold, and the gas sensor output related value which is the output related value of the gas sensor is used as the initial fire determination threshold. It is determined as the initial fire state that the gas sensor has reached or exceeded the initial fire determination threshold, and when the fire sensor output related value is equal to or greater than the fire sensor full fire determination threshold as the full fire determination threshold, Judgment,
The fire sensor initial fire determination threshold when the gas sensor output related value is greater than or equal to the gas sensor initial fire determination threshold, and the fire sensor initial determination threshold when the gas sensor output related value is less than the gas sensor initial fire determination threshold. Set it too small,
Long when the signal output delay time from the start of the continuous determination of the pre-Symbol fire state to the output of the fire protection command signal, to determine the initial fire condition than when determining the full fire condition The warning device which changes according to the output related value of at least one said fire environment state detection means. The absence state detecting means for detecting the absence state in which no person exists,
The alarm device according to claim 1, wherein the signal output delay time when the absence state is detected by the absence state detection unit is made shorter than when the absence state is not detected by the absence state detection unit. . Report the occurrence of a fire by outputting the fire countermeasure command signal to an external system, or output the fire countermeasure command signal to a shut-off valve capable of shutting off the gas supply to the fire source to shut off the shut-off valve The alarm device according to claim 1 or 2, wherein the alarm device is configured as described above.

Images