JP6925839B2 - Smoke detector - Google Patents

Description

The present invention relates to a smoke detection device that sucks and detects smoke in a protected area.

Conventionally, as a device for detecting a fire from the sign stage, a suction type smoke detection device has been used in which air in a protected area is sucked through a sampling pipe and smoke contained in the air is detected.

The suction type smoke detection device is generally provided as a fixed device on the ceiling, wall, underfloor, etc. of the protective space, and is provided with a sampling tube for sucking air in the protective space, and the sampling tube is provided. Smoke contained in the air sucked through the air can be optically detected (see, for example, Patent Document 1).

This type of suction smoke detector can detect smoke with higher sensitivity than non-smoke detectors and smoke detectors, such as facilities with a large number of information devices (computer rooms, etc.). It is installed in facilities such as server rooms, internet data centers, etc.) and clean rooms where there is constant circulating air flow by air conditioning equipment. And, in order to be able to catch and deal with the fire from the very early sign stage, even if the smoke concentration is at a stage that can not be confirmed with the naked eye, it is set with high sensitivity so that it can be detected. It is installed in.

However, by installing with such a high sensitivity setting, it is possible to catch the fire from the sign stage and deal with it quickly, but the detected smoke is at the stage where it can not be confirmed with the naked eye. If so, the location of the fire cannot be identified with the naked eye.

Therefore, the patent applicant has previously proposed a mobile smoke detection device capable of identifying the smoke generation position (see, for example, Patent Document 2). This mobile smoke detection device is equipped with a portable suction-type smoke detection device main body and a sampling tube movably connected to the main body, and the smoke detection device is provided while checking the smoke concentration. By moving the main body and the sampling tube, it is possible to search for the generation position of smoke even if it is invisible to the naked eye.

The suction type smoke detection device can also be used to detect a leak of refrigerant gas in an air conditioner installed for cooling an information device.

Japanese Patent No. 3648307 Japanese Unexamined Patent Publication No. 2014-106678

By the way, the suction type smoke detection device is provided with a display unit such as a bar graph that displays the detected smoke concentration (for example, dimming rate smoke concentration (% / m)) level, and the operator can use the display unit. The smoke concentration level can be intuitively recognized from the display unit.

However, since the display range of the display unit corresponds to the preset detection sensitivity, the concentration of the detected smoke becomes too high and exceeds the maximum level of the display range, so that no further increase change can be displayed. May be in a state of smoke. Specifically, for example, when searching for a smoke generation position (generation location) using a mobile smoke detection device, when the concentration of smoke detected in the process of approaching the smoke generation position becomes high. , Such a situation may occur. In addition, in an environment where air circulates, such as when there is an air conditioner, the smoke concentration locally increases at the stage of entering the protected area, and it may become saturated. By changing the detection sensitivity according to the detected smoke concentration and changing the display range of the display unit to the one corresponding to the detected smoke concentration, it is possible to display even a rising change that exceeds the maximum level. Although it is possible to do so, it is complicated and not easy to operate the sensitivity change while searching for the smoke generation position. Further, if the operator does not correctly recognize the sensitivity change, the smoke concentration level displayed on the display unit cannot be correctly recognized.

In view of the above circumstances, the present invention provides a smoke detection device capable of changing the detection sensitivity according to the detected smoke concentration and allowing the operator to recognize the change in the detection sensitivity. The purpose is.

According to the present invention, in a smoke detection device that detects smoke contained in air sucked from a protective area and displays the smoke concentration level in stages on a display unit, the maximum display range of the display unit corresponds to the detection sensitivity. The smoke concentration for displaying the level is set as the upper limit smoke concentration threshold, and when the detected smoke concentration becomes higher than the upper limit smoke concentration threshold , the smoke concentration per step in the display unit is increased. both If you change automatically lower the detection sensitivity, a smoke detection apparatus characterized by being configured so as to notify the operator that there has been a change in the detection sensitivity.

Further, in the present invention, the smoke concentration for displaying the minimum level of the display range of the display unit is further set as the lower limit smoke concentration threshold value according to the smoke detection sensitivity, and the detected smoke concentration is the lower limit smoke concentration. when it becomes lower than the threshold value, to reduce the smoke density per step in the display unit, when you change automatically increase the detection sensitivity both the operator that there has been a change in the detection sensitivity The smoke detection device is configured to notify, and can distinguish between a notification mode when the detection sensitivity is changed to a low value and a notification mode when the detection sensitivity is changed to a high value.

Further, the present invention is a smoke detection device, characterized in that the means for notifying the operator of the change is by at least one of sound, light and vibration.

In the present invention, when the detected smoke concentration becomes higher than the upper limit smoke concentration threshold set corresponding to the detection sensitivity, the detection sensitivity is changed to be lower and the detection sensitivity is changed. Is notified to the operator.

Therefore, according to the present invention, it is possible to provide a smoke detection device capable of changing the detection sensitivity according to the concentration of the detected smoke and making the operator recognize the change in the detection sensitivity. can.

Here, the display range of the display unit that displays the density level of the detected smoke corresponds to the detection sensitivity, and if there is a change in the detection sensitivity, it will be changed according to the change. That is, according to the present invention, the display range of the display unit can be changed according to the detected smoke concentration.

Further, in the present invention, the lower limit smoke concentration threshold value is further set corresponding to the detection sensitivity, and when the detected smoke concentration becomes lower than the lower limit smoke concentration threshold value, the detection sensitivity is changed to a high value. By configuring and notifying the operator that the detection sensitivity has been changed, the detection sensitivity can be changed not only low but also high in accordance with the detected smoke concentration. It can be changed, and the operator can be notified that the change has occurred.

Further, in the present invention, the change in the detection sensitivity is set to be high or low by making it possible to distinguish between the mode of notification when the detection sensitivity is changed low and the mode of notification when the detection sensitivity is changed high. It is possible to make the operator recognize whether it has been changed to.

An example of the embodiment of the smoke detection device of the present invention is shown, and it is a top view of the whole device in a state where a sampling tube and a strap which is a holding part are connected. The same as above is shown, and it is the top view of the smoke detection device main body in the state of being stored in a storage case. It is explanatory drawing which showed the state at the time of searching the smoke generation position by the smoke detection device of this invention in a computer room which is an example of a protection space.

The embodiment of the smoke detection device of the present invention is applied to a mobile smoke detection device in which the smoke detection device main body is portable together with a sampling tube for sucking air and can detect smoke while moving. As an example, it will be described with reference to FIGS. 1 to 3.

First, the basic configuration of the smoke detection device 1 as a whole will be described with reference to FIG.

As shown in FIG. 1, the smoke detection device 1 has a sampling tube 4 having a sampling hole 4a for sucking air on the tip side and a grip portion 4b on the base end side, and a base end of the sampling tube 4. A suction type smoke detection device main body 5 whose side is connected via a flexible tube 3 and detects smoke contained in the air sucked through the sampling tube 4, and a storage case 7 for accommodating the smoke detection device main body 5. The storage case 7 in which the smoke detection device main body 5 is housed is provided with a strap 8 for holding the storage case 7 on the operator's body. Although the power source (for example, a lithium ion secondary battery or the like) is built in the smoke detection device main body 5, it may be arranged in the storage case 7 and connected to the smoke detection device 1.

As described above, the smoke detection device 1 is mobile, and the operator holds the storage case 7 in which the smoke detection device main body 5 and the like are stored by the strap 8, and also grips the sampling tube 4, and smoke in that state. Smoke can be detected while moving the entire detection device 1 or the sampling tube 4 itself, whereby the smoke generation position can be searched.

In the case of the present embodiment, the sampling tube 4 has a flexible portion 4c whose tip side is movable in an arbitrary direction, and the flexible tube 3 is made of a soft resin. As a result, the sampling tube 4 can be deformed so that the tip side faces in an arbitrary direction, or the entire sampling tube 4 can be freely moved with respect to the smoke detection device main body 5.

Next, the details of the smoke detection device main body 5 will be described with reference to FIG.

The smoke detection device main body 5 is a suction type, and although not shown, inside the housing, a smoke detection unit for optically detecting smoke and air are detected via a sampling tube 4. It is equipped with a fan for passing the smoke detector inside the unit, and when the sucked air passes through the smoke detector, it optically detects if the air contains smoke. It is a thing. In the smoke detection device main body 5, the smoke detection unit has a light receiving element and a light emitting element for optically detecting smoke, but by using a laser as a light source of the light emitting element, it is very possible. It is possible to detect smoke with high sensitivity.

As shown in FIG. 2, an operation display unit 5b for displaying various operation states is provided on the upper surface of the housing of the smoke detection device main body 5. The storage case 7 is provided with a display window 7a at a position corresponding to the operation display unit 5b, and the operation display unit 5b can be visually recognized even when the smoke detection device main body 5 is stored in the storage case 7. It has become.

The operation display unit 5b is provided with a level display unit (an example of the display unit) 5a that displays the smoke concentration (dimming rate smoke concentration) level detected by the smoke detection unit. The level display unit 5a displays the density level in stages by a bar graph (LED level meter) so that the operator can intuitively recognize the density level (10 levels are displayed in the case of the illustrated example). The smoke detection range itself in the smoke detection unit has a wide range from a very low (light) smoke concentration to a high (thick) smoke concentration, but the smoke concentration level displayed by the level display unit 5a is displayed. The range corresponds to the detection sensitivity that can be set as appropriate. That is, the level display unit 5a displays the smoke concentration level within the range of the display range corresponding to the set detection sensitivity, and the higher the set detection sensitivity, the lower the smoke concentration level. On the other hand, the lower the set detection sensitivity, the higher the smoke concentration level is displayed. Specifically, in the case of the illustrated example, the level display unit 5a displays the smoke concentration level as a bar graph in 10 stages. In that case, for example, in the high detection sensitivity where the maximum level smoke concentration is 0.3%, the smoke concentration per step is 0.03% and displayed in 10 steps, and the maximum level smoke concentration is also displayed. At a low detection sensitivity of 3%, the smoke concentration per step is 0.3% and 10 steps are displayed. That is, in relation to the level display unit 5a, changing the detection sensitivity means changing the smoke concentration per step.

Then, the smoke detecting apparatus main body 5 is the upper limit smoke density threshold value corresponding to the detection sensitivity is set, when the concentration of smoke to be detected is higher than the upper smoke density threshold, the automatic detection sensitivity It is configured to change low. That is, the display range of the display unit 5a is automatically changed to one that can display a higher smoke concentration level. Further, when the detection sensitivity is changed, the operator is notified of the change.

That is, since the smoke detection device 1 includes the smoke detection device main body 5 configured as described above, the detection sensitivity can be changed according to the concentration of the detected smoke, and the level display unit. The display range of 5a can be changed to one that can display a higher smoke concentration level. In addition, the operator can be made aware that the detection sensitivity has been changed.

As a result, for example, when searching for a smoke generation position using the mobile smoke detection device 1, the concentration of smoke detected in the process of approaching the smoke generation position becomes high, and preset detection is performed. Level corresponding to sensitivity Even if it becomes higher than the maximum level in the display range of the display unit 5a, the detection sensitivity becomes higher when it becomes higher than the upper limit smoke concentration threshold set corresponding to the detection sensitivity. It is automatically changed to a lower one, and the display range of the level display unit 5a is automatically changed to one that can display a higher smoke concentration level, so without that change, the maximum level would have been exceeded. Even if the smoke concentration rises and changes, it can be displayed on the level display unit 5a, and the smoke can be further approached to the smoke generation position. Further, at that time, since the operator is notified that the detection sensitivity has been changed, the operator can recognize that the detection sensitivity has been changed, and the display range of the level display unit 5a is changed. You can recognize that. That is, the operator can continue to search for the smoke generation position as it is.

Here, if the detection sensitivity is high, the range in which the fire sign can be specified becomes wide, and if the detection sensitivity is low, the range in which the fire sign can be specified can be narrowed, but it cannot be detected at all at a distance from the place where the fire sign occurs. Even if you walk blindly, the operator will not know whether you are approaching or away from the place of occurrence. In other words, it is important for the operator that the smoke detection device 1 can always search while maintaining the optimum sensitivity when identifying the generation location, and notifying that the sensitivity has changed also approaches the generation location. It is important to recognize whether you are or are away.

The smoke detection device 1 will be described in more detail.

In the smoke detection device main body 5, the upper limit smoke concentration threshold value set corresponding to the detection sensitivity can be a smoke concentration that displays the maximum level in the display range of the level display unit 5a corresponding to the detection sensitivity.

Further, the automatic change of the detection sensitivity may not only be low but also high. That is, the smoke detection body 5, the lower limit smoke density threshold value corresponding to the detection sensitivity is assumed to be set, when the smoke density to be detected is lower than the lower smoke density threshold, automatically the detection sensitivity It may also be configured to change to a higher value. In such a case, the lower limit smoke concentration threshold value set corresponding to the detection sensitivity can be the smoke concentration that displays the minimum level in the display range of the level display unit 5a corresponding to the detection sensitivity.

Further, the automatic change of the detection sensitivity sets the upper limit smoke concentration threshold value and / or the lower limit smoke concentration threshold value as appropriate corresponding to each of the detection sensitivities, and changes the detection sensitivity low and / or high only between specific detection sensitivities. It may be possible, or it may be possible to change low and / or high between all detection sensitivities from the lowest sensitivity level to the highest sensitivity level.

Further, the timing of automatically changing the detection sensitivity may be immediately when it becomes higher than the upper limit smoke concentration threshold value, or may be after a predetermined time has elapsed. Similarly, when it becomes lower than the lower limit smoke concentration threshold value, it may be immediately or after a predetermined time has elapsed.

As a means for notifying the operator that the detection sensitivity has been changed, sound, light, vibration, or the like can be used, or a combination thereof can be used. Specifically, when the means for notifying the operator is sound, for example, a speaker can be used, and the change in detection sensitivity can be notified by the voice generated by the speaker. The voice mode may be, for example, an electronic sound such as a buzzer or a beep sound, a voice message, or the like. Further, when the means for notifying is light, for example, the level display unit 5a blinks, the display color changes, or the like, or a display unit for sensitivity level display is separately provided, and the display unit lights up, blinks, and displays color. It is possible to notify the change of the detection sensitivity by the change of the above. When a display unit for displaying the sensitivity level is separately provided, it may be provided on the sampling tube 4, for example. Further, when the means for notifying is to vibrate, for example, a vibrating portion incorporating a vibration motor is provided at an appropriate position (for example, a position where the operator touches the body) of the smoke detection device main body 5 or the storage case 7 to vibrate. The change in detection sensitivity can be notified by the vibration generated by the motor. If the means for notifying is to vibrate, remote control is required, but a vibrating portion incorporating a vibration motor may be provided in the grip portion 4b of the sampling tube 4.

A mobile terminal such as a smartphone may be used as a means for notifying the operator that the detection sensitivity has been changed. That is, a mobile terminal may be used to notify the operator that the detection sensitivity has been changed by sound, light, vibration, or a combination thereof. In this case, a holding means such as a holder for a mobile terminal may be provided in the sampling tube 4 or the like.

Here, by making it possible to distinguish between the mode of notification when the detection sensitivity is changed to low and the mode of notification when the detection sensitivity is changed to high, it is possible to determine whether the change in detection sensitivity is changed to high or low. It can be recognized by the operator including it. For example, in the case where the change in the detection sensitivity is notified by voice, if it is notified by a voice message, when the detection sensitivity is changed to a low value, "the detection sensitivity has been changed to a low value" or the like. When the detection sensitivity is changed to a high level, it can be notified by a voice message such as "The detection sensitivity has been changed to a high level". That is, it is possible to notify the operator that the detection sensitivity has been changed, including whether the change has been made to high or low.

Further, even when the notification is made by a beep sound, for example, it is notified that the detection sensitivity has been changed while indicating which of the high and low has been changed due to the change in the pitch of a plurality of beep sounds generated in sequence. If so, it is possible to notify the operator that the detection sensitivity has been changed while allowing the operator to intuitively recognize whether the change has been made to high or low. As a change in the pitch of a plurality of beep sounds that are sequentially generated, for example, two sounds having different pitches are used, and when the pitch is changed to low, the sounds are sequentially generated from the higher to the lower. On the other hand, when the sound is changed to a higher value, it is conceivable to generate a sound in order from the lower side to the higher side.

Next, an example of a specific embodiment when searching for a smoke generation position by the smoke detection device 1 will be described with reference to FIG.

The smoke detection device 1 is a mobile type. For example, in a protected area where a fixed smoke detection device is provided, after the fixed smoke detection device detects the generation of smoke, the smoke is generated. It can be used to search for a position. Specifically, for example, as shown in FIG. 3, in a computer room R provided with a fixed smoke detection device 10, a fixed type is used. After the smoke detection device 10 detects the generation of smoke, it can be used to search for the position where the smoke is generated. In the computer room R, there is a constant circulating air flow by the air conditioner 13 (see the arrow).

Here, the fixed smoke detection device 10 will be briefly described. As shown in FIG. 3, the fixed smoke detection device 10 has a sampling tube 12 that sucks air in the computer chamber R circulated by the air conditioner 13 and air sucked through the sampling tube 12. It is provided with a suction type smoke detection device main body 11 for detecting smoke, and these are provided as fixed in the computer room R at all times. The device configuration of the smoke detection device main body 11 can be the same as that of the smoke detection device main body 5 in the mobile smoke detection device 1. However, the detection sensitivity is fixed after setting and is not changed arbitrarily.

Then, when smoke is generated from the computer or the like in any of the racks 14 in the computer chamber R, the fixed smoke detection device 10 first detects the smoke. If the detected smoke is at a stage that cannot be confirmed with the naked eye, the smoke generation position can be specified up to the protected area of the fixed smoke detection device 10, but the mobile smoke detection device 1 By searching for the smoke generation position using, the smoke generation position can be specified in a narrower range.

Specifically, when the operator searches for the smoke generation position using the mobile smoke detection device 1, the operator straps the storage case 7 containing the smoke detection device main body 5 as shown in FIG. The entire smoke detection device 1 and sampling are performed so that the smoke concentration level displayed on the level display unit 5a becomes higher while holding the sample tube 4 in the body by 8 and detecting smoke in that state. The entire tube 4 can be moved, or the tip side of the sampling tube 4 having the sampling hole 4a can be moved by the flexible 4c to approach the sample tube 4.

At that time, the detected smoke concentration may increase in the process of approaching the smoke generation position, and may exceed the maximum level in the display range of the level display unit 5a corresponding to the preset detection sensitivity. However, as described above, when the upper limit smoke concentration threshold set corresponding to the detection sensitivity is exceeded, the detection sensitivity is automatically changed to a lower one, and the display range of the level display unit 5a is higher. Since the smoke concentration level is automatically changed to a displayable one, if there is no change, even if the smoke concentration rises beyond the maximum level, it can be displayed on the level display unit 5a, and the smoke can be displayed. It is possible to approach (narrow the search range) toward the higher concentration level of smoke. That is, it is possible to approach the position where smoke is generated. Further, when the detection sensitivity is changed, the operator is notified of the change, so that the operator can recognize that the detection sensitivity has been changed and the display range of the level display unit 5a has been changed. can.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made.

For example, in the above embodiment, in the mobile smoke detection device 1, the detection sensitivity can be changed according to the concentration of the detected smoke, and the operator can be made aware of the change in the detection sensitivity. Although the case where it is possible is shown, it may be possible to do so in the fixed smoke detection device, for example, in the fixed smoke detection device 10 as shown in FIG. It may be possible to do so. However, in the case of the fixed smoke detection device 10, since there may be no people around, it is advisable to issue a fire sign alarm when switching the sensitivity. That is, the fixed smoke detection device 10 outputs a fire sign alarm and lowers the sensitivity when a fire sign (exceeding the first threshold value) is confirmed in a highly sensitive state. Further, if a fire (exceeding the second threshold value) is confirmed in a state of low sensitivity, a fire alarm may be output.

It is also possible to use the mobile smoke detection device 1 in daily inspections before the fixed smoke detection device 10 detects smoke. In that case, the mobile smoke detection device 1 automatically or manually sets the highest sensitivity at the start of operation, and confirms the fire as a daily inspection. If a fire has occurred, the sensitivity is lowered as described in the above embodiment, so that the position of the fire can be reliably specified.

1: Smoke detection device (mobile) 3: Flexible tube 4: Sampling tube 4a: Sampling hole 4b: Grip part 4c: Flexible part 5: Smoke detection device body 5a: Level display part 5b: Operation display part 7: Storage case 7a: Display window 8: Strap 10: Smoke detection device (fixed type) 11: Smoke detection device body 12: Sampling tube 13: Air conditioner 14: Rack R: Computer room

Claims (2)

In a smoke detection device that detects smoke contained in the air sucked from the protected area and displays the smoke concentration level in stages on the display unit.
The smoke concentration that displays the maximum level of the display range of the display unit is set as the upper limit smoke concentration threshold value according to the detection sensitivity.
When the concentration of the smoke to be detected is higher than the upper limit smoke density threshold, by increasing the smoke density per step in the display unit, both when you change automatically lower the detection sensitivity, the detection A smoke detection device characterized in that it is configured to notify the operator that there has been a change in sensitivity. Corresponding to the smoke detection sensitivity, the smoke concentration that displays the minimum level of the display range of the display unit is further set as the lower limit smoke concentration threshold value.
When the concentration of the smoke to be detected is lower than the lower limit smoke density threshold, to reduce the smoke density per step in the display unit, both when you change automatically increase the detection sensitivity, the detection It is configured to notify the operator that the sensitivity has changed .
The smoke detection device according to claim 1, wherein the mode of notification when the detection sensitivity is changed to be low can be distinguished from the mode of notification when the detection sensitivity is changed to high.

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