JP2006092508A - Alarm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm device capable of outputting a fire alarm capable of inducing sufficient coping with a fire without causing misunderstanding. <P>SOLUTION: This alarm device is provided with a fire detecting means 14 for detecting a fire, a fire state determination means 16 for determining an initial fire state and a real fire state having a higher possibility of a fire having broken out and is really more serious than the initial fire state when the fire is detected, and an alarming means 15 for outputting an initial fire alarm when determining that the fire is in an initial state and outputting a real fire alarm when determining that the fire is really serious, and maintains the determination of the real fire alarm at least until the fire detecting means does not detect the fire any more after the fire state determining means 16 determines that the fire is really serious. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention provides a fire detection means for detecting a fire,
A fire state determination unit that determines an initial fire state and a full-scale fire state that is more likely to have a fire than the initial fire state when a fire is detected by the fire detection unit;
An alarm means for outputting an initial fire alarm when the fire condition determining means determines that an initial fire condition is present, and for outputting a full fire alarm when the fire condition determining means determines that an actual fire condition is present; Related to alarm devices.

  The fire alarm device as the alarm device includes a smoke detection type provided with a smoke sensor for detecting smoke as a fire sensor, a heat detection type provided with a heat sensor for detecting heat as a fire sensor, and a flame for detecting light emitted by a flame. There is a flame detection type equipped with a sensor as a fire sensor, and more specifically, a fire detection means for detecting as a fire when the output of a fire sensor that changes due to the occurrence of a fire exceeds a preset detection threshold And an alarm means for outputting a fire alarm when a fire is detected by the fire detecting means.

In addition, such a fire alarm device has a problem in that it detects smoke, heat, or flame generated during cooking or smoking and erroneously detects a fire.
Therefore, as a fire alarm device for avoiding such a false detection problem, a fire alarm device that generates a fire in a room apart from a fire detection means that detects a case where the output of the fire sensor exceeds a detection threshold is detected. If a gas sensor that detects the concentration of carbon oxide, etc. is installed, and a fire is detected by the fire detection means when the gas concentration detected by the gas sensor is less than the judgment threshold, it is determined that there is an initial fire condition, and the initial fire condition If the gas sensor output exceeds the determination threshold value and a fire is detected by the fire detection means, it is determined that a full-scale fire condition has occurred. There is known a fire alarm device configured to output a full-scale fire alarm for informing that a full-scale fire state is used instead of a fire alarm (for example, see Patent Document 1). Ether.)

  In addition, when the fire sensor output related value related to the output of the fire sensor is equal to or greater than the determination threshold value, the fire condition determination means determines that the fire condition is a full fire condition. If it is less than the above, it is determined that there is a possibility of a false detection of fire due to the detection of smoke, heat or flame generated during cooking or smoking as described above, and it is determined that it is in the initial fire state You can also.

JP 2000-132761 (FIG. 3 etc.)

  However, in an actual fire, the gas concentration such as carbon monoxide concentration is not always high, and the carbon monoxide concentration temporarily decreases as incomplete combustion due to fire shifts to complete combustion. If you want to. And in the fire alarm device of patent document 1, since it changes into a full-scale fire alarm and an initial fire alarm is output also in that case, for example, when a person who performs a fire fighting activity changes a full-scale fire alarm into an initial fire alarm In addition, there is a problem of misunderstanding that the fire has subsided.

  In addition, even when the fire condition determination means determines the full fire condition and the initial fire condition based on the fire sensor output related value, a fire actually occurs, and the fire sensor output related value once increases and becomes full scale. After judging that it is a fire condition and outputting a full-scale fire alarm, it is misjudged that the fire sensor output-related value has decreased due to some reason, even though the fire has not calmed down, There is a problem that the initial fire alarm is output instead of the full-scale fire alarm, and it is misunderstood that the fire has subsided.

  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 capable of outputting a fire alarm capable of prompting a sufficient countermeasure against a fire without causing misunderstanding. There is in point to do.

An alarm device according to the present invention for achieving the above object includes a fire detection means for detecting a fire,
A fire state determination unit that determines an initial fire state and a full-scale fire state that is more likely to have a fire than the initial fire state when a fire is detected by the fire detection unit;
An alarm means for outputting an initial fire alarm when the fire condition determining means determines that an initial fire condition is present, and for outputting a full fire alarm when the fire condition determining means determines that an actual fire condition is present; After the fire condition determining means determines that the full-scale fire state is present, the first characteristic configuration is the full-scale fire condition until at least the fire detecting means detects no fire. It is in the point comprised so that determination of (2) may be maintained.

  According to the first characteristic configuration described above, after the fire state determination means determines that the fire is in a full-scale fire state where there is a high possibility that a fire has occurred, the fire detection means at least until the fire is not detected by the fire detection means. By maintaining the determination of the fire condition, once the alarm means outputs a full-scale fire alarm, it will continue to output the full-scale fire alarm, so for example, for those who perform fire fighting activities, Sufficient countermeasures against the fire can be promoted without misunderstanding that the fire has subsided.

In addition to the first feature configuration, the second feature configuration of the alarm device according to the present invention includes a fire sensor that detects smoke, heat, or flame due to a fire,
When the fire sensor output related value relating to the output of the fire sensor is less than a determination threshold, the fire state determination means determines that the initial fire state is present, and the fire sensor output related value is equal to or greater than the determination threshold. In this case, it is determined that the full-scale fire state occurs.
The fire sensor output related value depends on the state of the fire sensor output, such as the output of the fire sensor, the rate of increase of the output, or the duration of the output continuously exceeding the set output. Can be obtained as a value that increases or decreases.

  According to the second characteristic configuration, after the fire state determination means determines that the fire sensor output-related value is equal to or greater than the determination threshold value and is in a full-scale fire state, the fire sensor is caused by some cause other than the fire calming down. Even if the output-related value falls below the same judgment threshold, at least until the fire is not detected by the fire detection means, the judgment of the full-scale fire condition is maintained and sufficient countermeasures are taken against the fire without causing misunderstandings. Can be urged.

In addition to the second feature configuration, the third feature configuration of the alarm device according to the present invention includes a gas sensor that detects the concentration of the fire-generated gas generated by the fire,
A determination sensitivity adjustment unit that adjusts the determination sensitivity of the fire state determination unit with respect to the full fire state and the initial fire state according to a fire generation gas concentration related value related to the concentration of the fire generation gas detected by the gas sensor. It is in.
Note that the fire-related gas concentration-related value is the value of the fire-generating gas, such as the concentration of the fire-generating gas, the rate of increase in the concentration, or the duration when the concentration continuously exceeds the set concentration. It can be determined as a value that increases or decreases with the concentration state.

  According to the third characteristic configuration, the fire-related gas concentration related value related to the concentration of the fire-generated gas detected by the gas sensor can be used for adjusting the determination sensitivity between the full-scale fire state and the initial fire state by the fire state determining means. . That is, if the judgment sensitivity adjustment means has a large value related to the concentration of fire-generated gas, it is judged that there is a high possibility of a full fire condition, and the judgment sensitivity of the fire condition judgment means for the full fire state and the initial fire state is high. In other words, adjust the judgment threshold for the full-scale fire condition and the initial fire condition set for the fire sensor output related value in the fire condition judgment means to the small side, and accurately adjust the fire condition. Can be determined.

A fourth feature configuration of the alarm device according to the present invention includes, in addition to any of the first to third feature configurations, a gas sensor that detects a concentration of a fire-generated gas generated by a fire,
The fire state determination means determines that the initial fire state is present when the fire-related gas concentration-related value related to the concentration of the fire-generated gas detected by the gas sensor is less than a determination threshold, and the fire-related gas concentration-related value Is equal to or greater than the determination threshold, it is determined that the full-scale fire state is present.

  According to the fourth feature configuration, after the fire condition determination means determines that the fire-related gas concentration-related value is equal to or greater than the determination threshold value and is in a full-scale fire condition, incomplete combustion due to fire shifts to complete combustion. Even if the concentration of fire-generating gas such as carbon monoxide temporarily falls below the threshold value, such as when In addition, it is possible to promote a sufficient countermeasure against a fire without causing misunderstanding.

  According to a fifth characteristic configuration of the alarm device according to the present invention, in addition to the fourth characteristic configuration, the fire state determination unit determines whether the full fire state and the initial fire state depend on a detection result of the fire detection unit. It is in the point provided with the determination sensitivity adjustment means which adjusts a sensitivity.

  According to the fifth characteristic configuration, the detection result by the fire detection unit can be used for adjusting the determination sensitivity between the full fire state and the initial fire state by the fire state determination unit in addition to the detection of the fire. That is, when the determination sensitivity adjustment means detects a relatively large fire with the fire detection means, it is determined that there is a high possibility of a full-scale fire condition, and the determination sensitivity of the fire condition determination means is adjusted to the higher side. In other words, it is possible to accurately determine the fire state by adjusting the determination threshold value set for the fire-related gas concentration related value by the fire state determination means to a smaller side.

A sixth characteristic configuration of the alarm device according to the present invention includes, in addition to any of the first to fifth characteristic configurations, a gas sensor that detects a concentration of a fire-generated gas generated by a fire,
The present invention is characterized in that a detection sensitivity adjusting means for adjusting the detection sensitivity of the fire detection means with respect to a fire according to a fire-related gas concentration related value relating to the concentration of the fire-generated gas detected by the gas sensor is provided.

  According to the sixth feature configuration, the fire-related gas concentration related value that is the detection result of the gas sensor can be used for adjusting the detection sensitivity of the fire detection means by the detection sensitivity adjustment means. That is, the detection sensitivity adjustment means determines that the greater the fire-related gas concentration related value detected by the gas sensor, the lower the possibility of false detection by the fire detection means, and adjusts the detection sensitivity of the fire detection means to the higher side. Thus, it is possible to accurately detect a fire and output a fire alarm.

  A seventh feature configuration of the alarm device according to the present invention includes, in addition to any of the third to sixth feature configurations, the gas sensor, carbon monoxide, hydrogen, aldehydes, ketones as the fire-generating gas, It is a sensor that detects at least one concentration of carbon dioxide, hydrogen chloride, and hydrogen cyanide.

  According to the seventh characteristic configuration, the fire generating gas generated by the fire includes carbon monoxide, hydrogen, aldehydes, ketones, carbon dioxide, hydrogen chloride or hydrogen cyanide, and the concentration of those fire generating gases. Although the fire-related gas concentration-related value is not always high at the time of a fire, it can be determined that the greater the fire-related gas concentration-related value, the higher the possibility that a fire has occurred.

  An eighth feature of the alarm device according to the present invention is such that, in addition to any of the third to seventh features, the alarm means outputs an alarm based on the fire-related gas concentration related value. In that it is configured.

  According to the eighth characteristic configuration, the gas sensor detects the concentration of the fire-generated gas generated by the fire, and the fire-related gas concentration-related value related to the concentration of the fire-generated gas is, for example, a predetermined determination threshold value or more. When it becomes, alarm means notify that the fire generation gas concentration became high, or alarm to notify that there was a high possibility that fire occurred or fire occurred An alarm such as an initial fire alarm can be output.

A ninth feature configuration of the alarm device according to the present invention includes, in addition to any of the first to eighth feature configurations, a fire sensor that detects smoke, heat, or flame due to a fire,
The fire detection means is configured to detect a case where a fire sensor output related value related to the output of the fire sensor is equal to or greater than a detection threshold as a fire.

  According to the ninth characteristic configuration, the fire detection means has a fire sensor output related value related to the output of the fire sensor that changes due to the occurrence of a fire such as a smoke sensor, a heat sensor, or a flame sensor. It can be configured to detect as a fire.

An embodiment of an alarm device according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the alarm device 10 detects a fire F and outputs a fire alarm. In this embodiment, the alarm device 10 is installed on a side wall 4 of a kitchen in the home and is cooked on the stove 2. The alarm device 10 configured to detect the fire F will be described.

  As shown in FIG. 2, the alarm device 10 basically includes a fire detection means 14 that detects a fire, and an alarm means 15 that outputs a fire alarm when the fire detection means 14 detects a fire. Configured.

  The alarm device 10 senses smoke from the fire F and emits an output related to the concentration of the smoke, a heat sensor that senses heat from the fire F and emits an output related to the amount of heat, and fire F A fire sensor 14a such as a flame sensor that senses light such as infrared rays and ultraviolet rays emitted from a flame and emits an output related to the intensity of the light is provided, and the fire detection means 14 is a fire sensor that changes when a fire occurs. The fire sensor output related value related to the output of the fire sensor 14a, such as the output of 14a, the rate of increase of the output per unit time, or the duration of the output continuously exceeding the set output is obtained, and the fire sensor When the output related value is equal to or more than a detection threshold set in advance as a reference for detecting the fire F in the fire sensor 14a, it is configured to detect as a fire.

  Moreover, the fire detection means 14 is comprised so that detection sensitivity with respect to the fire F can be changed freely by changing the detection threshold value. That is, by reducing the detection threshold value in the fire detection means 14, the state in which the fire F is detected sensitively to the output change of the fire sensor 14a, in other words, the detection sensitivity to the fire F becomes high. By increasing the detection threshold in the fire detection means 14, the state in which the fire F is detected insensitive to the output change of the fire sensor 14a, in other words, the detection sensitivity to the fire F is in a low state.

  The alarm means 15 outputs a fire alarm when a fire is detected by the fire detection means 14, and the form of outputting the fire alarm is a form of generating an alarm sound with a speaker or the like, A warning signal for shutting off the gas supply to the shutoff valve that shuts off the gas supply to the stove 2 or a mode for sending an alarm signal to a center device such as a gas supply company or a security company through a communication network It is possible to adopt a transmission form and other known fire alarm output forms.

  Further, the alarm device 10 is provided with a gas sensor 11 that detects the concentration of the fire-generated gas generated by the fire F in the installation space of the fire detection means 14.

  The gas sensor 11 is 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. Produced by incomplete combustion, hydrogen, aldehydes, and ketones are produced as components generated before ignition and intermediate products by fire F, and carbon dioxide, hydrogen chloride, and hydrogen cyanide are produced by fire F Further, it is produced as a product, and the amount produced is small during normal cooking and smoking.

  Therefore, the fire generation related to the concentration of the fire generating gas, such as the concentration of the fire generating gas detected by the gas sensor 11, the rate of increase of the concentration per unit time, or the duration for which the concentration continuously exceeds the set concentration If the gas concentration-related value is high, it can be determined that the possibility of fire F is high, and conversely, if the value of the fire-generated gas concentration is low, the possibility of fire F is low It can be judged.

  Further, as the gas sensor 11 as described above, a known constant potential electrolytic type, an electromotive force detection type, a redox mixed potential detection type, a type that detects an electrode reaction current installed on an electrolyte, or a metal oxide semiconductor type. For example, a gas sensor for detecting the concentration of carbon monoxide includes a tin oxide semiconductor or an indium oxide semiconductor as a metal oxide semiconductor. Use a gas sensor of the semiconductor type using a sensitive part consisting of a gas sensor or an electrochemical gas sensor that detects the current generated by the reaction of carbon monoxide on an electrode such as an electrolyte or solid electrolyte. As a gas sensor that detects the concentration of hydrogen, a semi-sensitive part made of a tin oxide semiconductor or the like is used as a metal oxide semiconductor. Body type or catalytic combustion type gas sensor or the like can be used.

  Further, referring to FIGS. 13 and 14 showing the states of fire detection and fire state determination for the fire-related gas concentration related value and the fire sensor output related value, the alarm device 10 includes a fire sensor related to the output of the fire sensor 14a. When the output-related value is equal to or greater than the detection threshold and the fire detection means 14 detects a fire, an initial fire state with a relatively low possibility that a fire has occurred, and a fire occurs than the initial fire state. There is provided a fire condition determination means 16 for determining a full-scale fire condition that is likely to occur.

  Then, when the fire state determination means 16 determines that the fire condition determination means 16 is in the initial fire state, the alarm means 15 outputs an initial fire alarm that prompts the user to confirm the fire because, for example, a fire is detected. When the fire state determination means 16 determines that a full-scale fire state is present, for example, it is configured to output a full-scale fire alarm that informs the user that a fire has occurred.

Further, the fire state determination means 16 determines that the fire is in full fire, for example, in order to prompt the person who performs the fire fighting activities to cope with the fire sufficiently without misunderstanding that the fire has subsided. Thereafter, at least the fire sensor output-related value such as the output of the fire sensor 14a is less than the detection threshold value, and the fire detection unit 14 is configured to maintain the determination of the true fire state until the fire is not detected. .
Therefore, the alarm means 15 will continue to output the full-scale fire alarm once the full-scale fire alarm is output.

Further, the alarm device 10 is provided with detection sensitivity adjustment means 13 for adjusting the detection sensitivity of the fire detection means 14 to fire according to the fire generation gas concentration related value relating to the concentration of the fire generation gas detected by the gas sensor 11. Yes.
Specifically, the detection sensitivity adjustment unit 13 adjusts the detection sensitivity of the fire detection unit 14 to a higher side as the fire generation gas concentration related value related to the concentration of the fire generation gas detected by the gas sensor 11 is larger. The detection threshold value of the fire detection means 14 is adjusted to a smaller side.

  That is, when the concentration of the fire-generated gas detected by the gas sensor 11 is high and it can be determined that there is a high possibility that the fire F has occurred, the detection sensitivity adjustment unit 13 increases the detection sensitivity of the fire detection unit 14 to the higher side. By adjusting to, it is possible to detect a fire while ensuring a desired detection accuracy.

  Hereinafter, 1st Embodiment and 2nd Embodiment for implementing the alarm device 10 demonstrated so far are described.

[First Embodiment]
In the alarm device 10 according to the first embodiment, the fire condition determination unit 16 sets a fire generation gas concentration related value relating to the concentration of the fire generation gas detected by the gas sensor 11 in advance for the output of the gas sensor 11. When it is less than the threshold, it is determined that the initial fire state is present, and when the fire-related gas concentration-related value is equal to or greater than the determination threshold, it is determined that the actual fire state is present.

Further, the alarm device 10 is provided with a determination sensitivity adjustment means 17 that adjusts the determination sensitivity of the fire state determination means 16 for the full fire state and the initial fire state according to the detection result of the fire detection means 14.
Specifically, the determination sensitivity adjustment unit 17 adjusts the determination sensitivity of the fire state determination unit 16 to a higher side as the fire sensor output related value related to the output of the fire sensor 14a is larger. In other words, the fire state determination unit 16 The determination threshold is adjusted to the smaller side.

  That is, when the output of the fire sensor 14a is high and it can be determined that there is a high possibility of a full-scale fire state, the determination sensitivity adjustment unit 17 adjusts the determination sensitivity of the fire state determination unit 16 to the high side, A full-scale fire condition can be determined while ensuring desired determination accuracy.

Next, the flow of the fire alarm process performed by the alarm device 10 of the first embodiment described so far will be described based on FIG. 3 and FIG.
Although the details will be described later, the alarm device 10 executes detection sensitivity adjustment processing as shown in FIG. 4 (step # 101). Next, the fire sensor 14a outputs a from the fire sensor 14a as described above. It is determined whether or not the fire F has occurred by determining whether or not the detection threshold A is equal to or higher than the adjusted detection sensitivity (step # 102).

When the output a of the fire sensor 14a is equal to or greater than the detection threshold A, the fire condition determination means 16 is executed after executing the determination sensitivity adjustment process as shown in FIG. Thus, by determining whether or not the concentration b of the fire-generated gas detected by the gas sensor 11 is equal to or higher than a preset determination threshold B, it is determined whether it is a full-scale fire state or an initial fire state (step # 104).
However, in step # 104, when the variable i for recognizing that the full fire alarm is being output is 1 indicating that the full fire alarm is being output, Always determined to be in full fire.

  In step # 102, if the output a of the fire sensor 14a is less than the detection threshold A, the variable i is set to 0 indicating that a full-scale fire alarm is not output (step # 105).

  In step # 104, when the fire state determination means 16 determines that the fire generation gas concentration b is less than the preset determination threshold B and i is not 1, i.e., it is determined as the initial fire state. In this case, an initial fire alarm is output by the alarm means 15 (step # 106), and when it is determined that the fire generation gas concentration b is equal to or higher than a preset determination threshold B, or i = 1, In other words, if it is determined that a full-scale fire condition is present, a full-scale fire alarm is output by the alarm means 15 (step # 107).

When a full-scale fire alarm is output, the variable i is set to 1 indicating that a full-scale fire alarm is being output (step # 108).
Therefore, after determining that the fire state determination means 16 is in a full-scale fire state in step # 104 and setting i to 1, at least in step # 102, it is determined that the output a of the fire sensor 14a is less than the detection threshold A and fire Until the detection means 14 detects no fire, the determination of the full fire condition is maintained.

Next, the detection sensitivity adjustment process executed in step # 102 will be described with reference to FIG.
In the detection sensitivity adjustment process, first, the detection sensitivity adjustment means 13 determines whether or not the fire generation gas concentration b detected by the gas sensor 11a is greater than or equal to a preset determination threshold B ′ (step # 201). . The determination threshold B ′ may be set to the same value as the determination threshold B that is a reference for determining the initial fire state and the full-scale fire state by the fire state determination unit 16 in step # 104 described above or another value. it can.

  If the fire generation gas concentration b is equal to or higher than a preset determination threshold B ′, the fire detection means 14 is set to a smaller value A1 (step # 202) to detect fire. If the detection sensitivity of the means 14 is adjusted to be high and, conversely, if the fire generation gas concentration b is less than the preset determination threshold B ′, the detection threshold A of the fire detection means 14 is set to a larger value A2 ( That is, A1 <A2) is set (step # 203), and the detection sensitivity of the fire detection means 14 is adjusted to be low.

  Further, in step # 201, it is determined whether or not the concentration b of the fire generating gas is equal to or higher than a determination threshold set as the same value as the predetermined determination threshold B ′ or another value, and the concentration of the fire generating gas is determined. When b is equal to or higher than the determination threshold, the alarm means 15 notifies the fact that the fire generation gas concentration b is relatively high in the installation space, or notifies that a fire has occurred. For example, an alarm such as an initial fire alarm may be output.

Next, the determination sensitivity adjustment process executed in step # 103 will be described with reference to FIG.
In the determination sensitivity adjustment process, first, the determination sensitivity adjustment means 17 determines whether or not the output a of the fire sensor 14a is greater than or equal to a preset threshold A ′ (step # 301). The setting threshold A ′ is set to a value larger than the detection threshold A that serves as a reference for fire detection by the fire detection means 14 in step # 102 described above.

  If the output a of the fire sensor 14a is greater than or equal to a preset threshold value A ′, the fire condition determination unit 16 sets the judgment threshold value B to a smaller value B1 (step # 302), and fire When the determination sensitivity of the state determination unit 16 is adjusted to be higher, and conversely, when the output a of the fire sensor 14a is less than the preset threshold A ′, the determination threshold B of the fire state determination unit 16 is increased. The value B2 (that is, B1 <B2) is set (step # 303), and the determination sensitivity of the fire state determination unit 16 is adjusted to be low.

In addition, instead of the fire generation gas concentration b used in the determination process of step # 104 or step # 201, the rate of increase of the concentration b per unit time or the concentration b continuously becomes equal to or higher than the set concentration. Other fire-related gas concentration related values such as duration may be used.
In addition, instead of the output a of the fire sensor 11a used in the determination process of step # 102 or step # 301, the rate of increase of the output a per unit time, or the output a continuously exceeds the set output. Other fire sensor output related values such as duration may be used.

〔Example〕
Next, assuming the occurrence of an actual fire, the output form (example) of the fire alarm of the alarm device of the first embodiment described above, and the output form (comparative example) of the fire alarm of the conventional fire alarm device, Will be described.
Here, as a conventional fire alarm device as a comparative example, a gas sensor similar to the alarm device of the above-described embodiment as an example and a fire detection means using the fire sensor are provided, and the gas concentration detected by the gas sensor is If a fire is detected by the fire detection means when it is less than the judgment threshold, an initial fire alarm is output. On the other hand, if the gas sensor output exceeds the judgment threshold and a fire is detected by the fire detection means, a full-scale alarm is output. Use a fire alarm device configured to output a fire alarm. That is, the fire alarm device of this comparative example, unlike the alarm device of the embodiment, maintains the full fire alarm if the gas concentration detected by the gas sensor becomes less than the judgment threshold even after outputting the full fire alarm. And is configured to output an initial fire alarm.
As the gas sensor, a carbon monoxide sensor that detects the concentration of carbon monoxide (CO) is used.

  First, as shown in FIG. 6 and FIG. 7, immediately after the occurrence of a fire, when the fire sensor output is equal to or greater than the detection threshold and the fire is detected by the fire detection means from the occurrence of the fire to the extinction. Assuming that the concentration of carbon monoxide detected by the gas sensor for a reason such as incomplete combustion immediately before quenching temporarily exceeds the determination threshold.

  In this case, in the alarm device of the embodiment, as shown in FIG. 6, after the fire is detected by the fire detection means, the initial fire alarm is issued until the carbon monoxide concentration detected by the gas sensor becomes equal to or higher than the determination threshold. Although it is output, once the carbon monoxide concentration detected by the gas sensor is equal to or greater than the determination threshold, the full-scale fire alarm should be continuously output even if the carbon monoxide concentration temporarily falls below the determination threshold. become.

  On the other hand, in the fire alarm device of the comparative example, as shown in FIG. 7, while the carbon monoxide concentration is lower than the set threshold by shifting from incomplete combustion to complete combustion as the combustion progresses, the initial fire Since the alarm is output, the user may misunderstand that the fire has stopped by changing the full-scale fire alarm to the initial fire alarm.

Next, as shown in FIGS. 8 and 9, it is assumed that the output of the fire sensor increases due to cooking, smoking, or the like, while the carbon monoxide concentration detected by the gas sensor is maintained below the determination threshold. To do.
In this case, in the alarm device of the embodiment, as shown in FIG. 8, since the carbon monoxide concentration detected by the gas sensor is less than the determination threshold value, the detection threshold value of the fire detection means is high (detection sensitivity is low). Therefore, the output of the fire sensor is suppressed from exceeding the detection threshold, and the initial fire alarm is prevented from being erroneously output.
On the other hand, in the fire alarm device of the comparative example, as shown in FIG. 9, the detection threshold value of the fire detection means is set lower than that of the embodiment (high detection sensitivity), so the output of the fire sensor is equal to or higher than the detection threshold value. Thus, the initial fire alarm may be output by mistake.

Next, as shown in FIGS. 10 and 11, when a fire has occurred but the increase in the output of the fire sensor is relatively small, on the other hand, the carbon monoxide concentration detected by the gas sensor is equal to or higher than the determination threshold. Is assumed.
In this case, in the alarm device of the embodiment, as shown in FIG. 10, the initial fire alarm is output when the carbon monoxide concentration detected by the gas sensor becomes equal to or higher than the determination threshold, and the detection threshold of the fire detection means Is adjusted to be low (high detection sensitivity), so that even if the output of the fire sensor is relatively small, the detection threshold is exceeded, and a full-scale fire alarm can be output following the initial fire alarm.
On the other hand, in the fire alarm device of the comparative example, as shown in FIG. 11, the detection threshold of the fire detection means is set higher than that of the embodiment (low detection sensitivity), so the output of the fire sensor is relatively small. Therefore, since the output is less than the detection threshold, not only a full-scale fire alarm but also an initial fire alarm cannot be output.

  From the above results, it can be said that the alarm device of the embodiment can output a fire alarm that can prompt a sufficient countermeasure against the fire without causing misunderstanding, compared with the fire alarm device of the comparative example.

[Second Embodiment]
The alarm device 10 of the second embodiment omits the description of the same configuration as that of the first embodiment described above, but the fire sensor determination unit 16 has a fire sensor output related value related to the output of the fire sensor 14a. If the sensor output related value is less than the preset judgment threshold, it is determined that the initial fire condition is present, and if the fire sensor output related value is greater than or equal to the judgment threshold value, it is determined that the actual fire condition is present. Is configured to do.

  Further, when the fire state determination unit 16 determines the full fire state and the initial fire state using the fire sensor output related value in this way, the detection is not performed by the fire detection unit 14 but by the gas sensor 11. A determination sensitivity adjustment unit 17 that adjusts the determination sensitivity of the fire state determination unit 16 with respect to the full fire state and the initial fire state according to the fire generation gas concentration related value related to the concentration of the fire generation gas can be provided.

  Specifically, the determination sensitivity adjustment unit 17 adjusts the determination sensitivity of the fire state determination unit 16 to a higher side as the fire-related gas concentration related value is larger. In other words, the determination threshold value of the fire state determination unit 16 is adjusted. Configured to adjust to the smaller side.

  That is, when it is possible to determine that the concentration of the fire-generated gas is high and there is a high possibility of a full-scale fire state, the determination sensitivity adjustment unit 17 adjusts the determination sensitivity of the fire state determination unit 16 to the higher side, thereby It is possible to determine a full-scale fire condition while ensuring the determination accuracy.

  Further, as shown in FIG. 14, the detection sensitivity adjustment unit 13 that adjusts the detection sensitivity of the fire detection unit 14 to the fire according to the detection result of the gas sensor 11 has a fire-related gas concentration related value that is less than a predetermined set threshold value. In some cases, the detection threshold value of the fire detection means 14 is set to the same value as the determination threshold value for the full-scale fire state of the fire condition determination means 16, and when the fire-related gas concentration related value is equal to or greater than a predetermined set threshold value, The detection threshold value of the fire detection unit 14 can be configured to be smaller than the determination threshold value for the full-scale fire state of the fire state determination unit 16.

  That is, when the fire-related gas concentration-related value is less than the set threshold value, when the fire sensor output-related value is equal to or higher than the relatively high detection threshold value and the determination threshold value equal thereto, a fire is detected by the fire detection means 14. At the same time, it is automatically determined by the fire state determination means 16 that the actual fire state is present.

Next, the flow of the fire alarm process performed by the alarm device 10 of the second embodiment described so far will be described based on FIG.
The alarm device 10 appropriately executes the detection sensitivity adjustment process similar to that in the first embodiment (step # 201), and then detects that the output a of the fire sensor 14a is adjusted as described above by the fire detection means 14. It is determined whether or not the fire F has occurred by determining whether or not the detection threshold value A is greater than or equal to the sensitivity (step # 202).

If the output a of the fire sensor 14a is greater than or equal to the detection threshold A, the detection sensitivity adjustment process similar to that of the first embodiment is appropriately executed (step # 203), and then the fire state determination means 16 causes the fire sensor 14 to By determining whether or not the output a of 14a is equal to or greater than the determination threshold A ″ set to be equal to or greater than the maximum value of the detection threshold A, it is determined whether the actual fire state or the initial fire state (step # 204).
However, in this step # 204, when the variable i for recognizing that the full fire alarm is being output is 1 indicating that the full fire alarm is being output, Always determined to be in full fire.

  In step # 202, when the output a of the fire sensor 14a is less than the detection threshold A, the variable i is set to 0 indicating that a full-scale fire alarm is not output (step # 205).

  In step # 204, when it is determined by the fire state determination means 16 that the output a of the fire sensor 14a is less than the determination threshold A ″ and i = 1, in other words, when the initial fire state is determined. When the initial fire alarm is output by the alarm means 15 (step # 206) and it is determined that the output a of the fire sensor 14a is equal to or greater than the determination threshold A ″ or i = 1, in other words, a full-scale fire state If it is determined that it is, a real fire alarm is output by the alarm means 15 (step # 207).

If a full-scale fire alarm is output, the variable i is set to 1 indicating that a full-scale fire alarm is being output (step # 208).
Therefore, in step # 204, after the fire state determination means 16 determines that a full-scale fire state has occurred and sets i to 1, at least in step # 102, it is determined that the output of the fire sensor a is less than the detection threshold A and fire detection. Until the fire is no longer detected by the means 14, the determination of the full-scale fire state is maintained.

[Another embodiment]
(1) In the above embodiment, the fire detection means 14 is configured to detect as a fire using, for example, a fire sensor 14a that senses smoke, heat, or flame. However, the fire detection means 14 is configured to detect a fire in another form. You may comprise.
For example, the fire detection means 14 has a fire generation gas concentration related value relating to the concentration of the fire generation gas detected by the gas sensor 11 greater than or equal to a detection threshold different from the determination threshold for the fire state determination by the fire state determination means 16. It can be configured to detect that it is a fire. The gas sensor 11 includes a gas sensor that detects a concentration of the fire-generating gas different from the detection target of the gas sensor 11, and the fire detection means 14 has a fire-related gas concentration-related value related to the concentration of the fire-generating gas detected by the gas sensor. It can also be configured to detect as a fire that the output exceeds a preset detection threshold.

(2) In the above embodiment, the detection sensitivity adjustment means 13 for executing the detection sensitivity adjustment process and the determination sensitivity adjustment means 17 for executing the determination sensitivity adjustment process are provided. I do not care.

(3) In the above embodiment, the detection sensitivity of the fire detection means 14 and the detection sensitivity of the fire condition determination means 16 are adjusted in two steps according to the detection results of the environmental condition detection means 11 and the fire detection means 14. Although shown, these detection sensitivities and determination sensitivities may be adjusted in two or more stages, or may be adjusted in a stepless manner. Further, the detection sensitivity and determination sensitivity can be finely adjusted by continuously changing the detection results of the environmental state detection means 11 and the fire detection means 14 based on a predetermined function or data table. . That is, such an alarm device is a function or table that associates the detection result of the gas sensor and the detection sensitivity of the fire detection means, or a function or table that associates the detection result of the fire detection means and the determination sensitivity of the fire state determination means. The detection sensitivity of the fire detection means is determined from the detection result of the gas sensor based on the function or data table, or the determination sensitivity of the fire condition determination means is determined from the detection result of the fire detection means based on the function or table. Configured to determine.

Hereinafter, an example of an alarm device that adjusts the detection sensitivity of the fire detection unit and the determination sensitivity of the fire state determination unit using a function or a data table will be described.
In the alarm device described here, as with the alarm device 10 described in the above embodiment and FIG. 2, the fire detection means 14 for detecting a fire is set in advance with a fire sensor output related value relating to the output of the fire sensor 14a. When the fire detection means 14 detects a fire when the fire detection means 14 detects a fire, a fire sensor output related value or a gas sensor is detected. After determining the initial fire state and the full-scale fire state based on the fire-related gas concentration-related values of 11 and determining that the fire is in a full-scale fire state, at least until the fire is not detected by the fire detection means 14, The alarm device 10 is configured to maintain the determination.

In this alarm device, as shown in FIG. 13 or FIG. 14, as the fire-related gas concentration related value increases, the detection sensitivity of the fire detection means increases continuously, that is, for the fire sensor output related value of the fire detection means. The detection threshold value is defined so as to decrease continuously or stepwise, and has a function or a data table that associates the fire-related gas concentration related value with the detection threshold value as the detection sensitivity of the fire detection means.
Then, by using the alarm device configured as described above, the fire sensor output related value acquired using the fire sensor and the fire generation gas concentration related value acquired using the gas sensor are applied to the function or the data table, and the fire is detected. Can be detected.

Further, as shown in FIG. 13, the alarm device has a higher determination sensitivity of the fire state determination means as the fire sensor output related value becomes higher, that is, a determination threshold for the fire generation gas concentration of the fire determination means. Is defined so as to be continuously reduced, and has a function or data table in which the fire sensor output related value and the determination threshold value as the determination sensitivity of the fire state determination means are associated with each other.
Then, by using the alarm device configured as described above, the fire sensor output related value acquired using the fire sensor and the fire generation gas concentration related value acquired using the gas sensor are applied to the function or the data table, and the initial value is set. A fire condition and a full-scale fire condition can be determined.

And even in the alarm means 15 configured in this way, after the alarm means once outputs the full-scale fire alarm, it prohibits the output of the initial fire alarm at least until no fire is detected. Continuously output a full-scale fire alarm.
In addition to the above function or data table, the alarm means 15 is used to notify that the fire-generated gas concentration is relatively high when the fire-related gas concentration-related value is equal to or greater than a set threshold value. A fire gas alarm can be output.

  As shown in FIG. 13 and FIG. 14 above, areas such as a full fire alarm, an initial fire alarm, a fire gas alarm, and no alarm are defined in association with the fire gas concentration related value and the fire sensor output related value. The coordinates of the fire sensor output related value acquired using the fire sensor and the fire generated gas concentration related value acquired using the gas sensor are in any region of the data map. Depending on the situation, it may be judged whether a full-scale fire alarm, an initial fire alarm, a fire generation gas alarm, no alarm, or the like.

Diagram showing the installation status of the alarm device Schematic configuration diagram of alarm device The figure which shows the fire alarm processing flow by the alarm device of 1st Embodiment. Diagram showing detection sensitivity adjustment processing flow Diagram showing the judgment sensitivity adjustment process flow The figure which shows the output form of the fire alarm of the alarm device of an Example The figure which shows the output form of the fire alarm of the fire alarm device of a comparative example The figure which shows the output form of the fire alarm of the alarm device of an Example The figure which shows the output form of the fire alarm of the fire alarm device of a comparative example The figure which shows the output form of the fire alarm of the alarm device of an Example The figure which shows the output form of the fire alarm of the fire alarm device of a comparative example The figure which shows the fire alarm processing flow by the alarm device of 2nd Embodiment Explanatory drawing which shows the state of fire detection and fire state judgment for fire-related gas concentration related value and fire sensor output related value Explanatory drawing which shows the state of fire detection and fire state judgment for fire-related gas concentration related value and fire sensor output related value

Explanation of symbols

10: Alarm device 11: Gas sensor 11b: Absence state detection means 13: Detection sensitivity adjustment means 14: Fire detection means 14a: Fire sensor 14b: Hydrogen sensor 15: Alarm means 16: Fire state determination means 17: Determination sensitivity adjustment means F: fire

Claims (9)

Fire detection means for detecting a fire;
A fire state determination unit that determines an initial fire state and a full-scale fire state that is more likely to have a fire than the initial fire state when a fire is detected by the fire detection unit;
An alarm means for outputting an initial fire alarm when the fire condition determining means determines that an initial fire condition is present, and for outputting a full fire alarm when the fire condition determining means determines that an actual fire condition is present; Alarm device,
An alarm device configured to maintain the determination of the full-scale fire state after the fire-state determination unit determines that the full-scale fire state is detected, at least until no fire is detected by the fire detection unit. It has a fire sensor that detects smoke, heat, or flame from a fire,
When the fire sensor output related value relating to the output of the fire sensor is less than a determination threshold, the fire state determination means determines that the initial fire state is present, and the fire sensor output related value is equal to or greater than the determination threshold. The alarm device according to claim 1, wherein the alarm device determines that the full-scale fire state occurs. Equipped with a gas sensor that detects the concentration of fire-generated gas generated by a fire,
A determination sensitivity adjustment unit that adjusts determination sensitivity of the fire state determination unit with respect to the full fire state and the initial fire state according to a fire generation gas concentration related value related to a fire generation gas concentration detected by the gas sensor. Item 3. The alarm device according to Item 2. Equipped with a gas sensor that detects the concentration of fire-generated gas generated by a fire,
The fire state determination means determines that the initial fire state is present when the fire-related gas concentration-related value related to the concentration of the fire-generated gas detected by the gas sensor is less than a determination threshold, and the fire-related gas concentration-related value The alarm device according to any one of claims 1 to 3, wherein when the value is equal to or greater than a determination threshold value, the real fire state is determined.   The alarm device according to claim 4, further comprising a determination sensitivity adjustment unit that adjusts a determination sensitivity of the fire state determination unit with respect to the full fire state and the initial fire state according to a detection result of the fire detection unit. Equipped with a gas sensor that detects the concentration of fire-generated gas generated by a fire,
The detection sensitivity adjustment means which adjusts the detection sensitivity with respect to the fire of the said fire detection means according to the fire generation gas concentration related value regarding the density | concentration of the fire generation gas detected with the said gas sensor is provided in any one of Claim 1 to 5 The alarm device described.   The said gas sensor is a sensor which detects the density | concentration of at least 1 of carbon monoxide, hydrogen, aldehydes, ketones, carbon dioxide, hydrogen chloride, and hydrogen cyanide as said fire generation gas. Alarm device as described in.   The alarm device according to any one of claims 3 to 7, wherein the alarm means is configured to output an alarm based on the fire-related gas concentration related value. It has a fire sensor that detects smoke, heat, or flame from a fire,
The alarm device according to any one of claims 1 to 8, wherein the fire detection unit is configured to detect a fire when a fire sensor output related value related to the output of the fire sensor is equal to or greater than a detection threshold. .

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