JP7027181B2 - Fire detection system - Google Patents

Description

The present invention relates to a fire detection system.

Conventionally, fire alarm equipment such as smoke detectors has been provided on the ceiling surface in rack warehouses in which storage compartments are formed by racks and automated warehouses in which luggage stored in racks is transported in the warehouse by an elevating device. There is. In such a warehouse, the ceiling height is higher than that of a general living room, and luggage is stored at a high density. In such a warehouse, luggage becomes an obstacle and smoke fills the storage compartment, making it difficult for smoke to reach the ceiling smoothly. Based on this point of view, branch pipes are provided for each of the containment compartments, smoke induced from the branch pipe side is collected in the main pipe, and a smoke detector provided at the end side of the main pipe is used. Also considered is equipment that can detect smoke in the containment compartment (see Patent Document 1).

Japanese Unexamined Patent Publication No. 10-143779

However, in the warehouse, the smoke does not always reach the upper surface side of the storage compartment smoothly depending on the storage condition of the cargo and the environment around the storage compartment. In addition, since the warehouse has a high ceiling with a high ceiling height, it is difficult for smoke from a fire to sufficiently rise to the ceiling surface, and the warehouse may float in the air. In such a case, early detection of smoke by a smoke detector becomes difficult.
In addition, when the luggage storage compartment is provided in multiple stages in the height direction, the smoke generated in the lower part of the storage compartment loses its ascending speed due to being hindered by the structures and luggage constituting the storage compartment. It will be difficult to reach the ceiling and will drift in the middle layer.
Especially in the hot season such as summer, the temperature near the ceiling rises due to the heating of the roof of the warehouse. Then, the temperature of the air near the ceiling becomes higher than that of the air in the lower layer portion, so that the air circulation in the height direction is hindered and a so-called boundary layer is formed. If the air temperature in this boundary layer becomes higher than the air temperature generated by a smoked fire, the smoke from the fire stays at the bottom of the boundary layer and does not rise to the ceiling, and the smoke from the smoke detector. Early detection becomes difficult.
In particular, in a rack warehouse, luggage may be stored at high density, the amount of combustibles in the space, the so-called fire load, is large, and it is highly possible that it will be difficult to extinguish a fire in the event of a fire. In addition, when extinguishing a fire, if the fire extinguishing agent is sprayed by a sprinkler installed on the ceiling, the sprayed fire extinguishing agent may be blocked by luggage and the water or the fire extinguishing agent may not reach the fire point. In addition, even in a space where luggage is not stored, water and fire extinguishing agent are transpired by the flame because the distance to the floor is large when the fire that occurred in the space with a high ceiling height spreads. Or, it is more likely that the fire point generated on the floor will not be reached due to diffusion to the surroundings due to the hot air flow.
For this reason, in warehouses and factories with high ceilings, it is desirable to detect at the smoke stage, which is the very early stage of fire, but on the other hand, the gradual rise of smoke due to smoke does not cause the smoke to rise to the high ceiling. , Smoke drifts in the hollow, making early detection difficult.
In Patent Document 1, smoke can be detected in the accommodation section provided with the branch pipe, but it is difficult to detect smoke in other areas.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fire detection system capable of detecting a fire at an early stage in a monitoring area having a high ceiling.

In order to solve the above-mentioned problems, in one aspect of the present invention, a plurality of dimming smoke detectors are provided at different positions with respect to the height direction in the region below the ceiling of the space to be monitored . A plurality of storage compartments are formed in the monitoring target, and the dimming smoke detector has a detection range of at least a non-containment compartment that is not the accommodation compartment, and is a stacker crane that takes in and out and transports luggage to and from the accommodation compartment. An operation information acquisition unit that acquires operation information indicating an operation, and a determination unit that determines whether or not the monitoring light beam emitted by the dimming smoke detector is blocked by the stacker crane based on the operation information. It is a fire detection system equipped .

Further, in the fire detection system of one aspect of the present invention, the dimming smoke detector is installed so that different regions on a plane have a detection range.

Further, in the fire detection system of one aspect of the present invention, the direction of the optical axis of the monitoring light beam emitted from the dimming smoke detector is the direction along the plane direction of the monitoring target.

Further, in the fire detection system of one aspect of the present invention, the non-containment compartment is a passage compartment.

Further, in the fire detection system of one aspect of the present invention, the non-containment compartment is a fire detection system in which a stacker crane for loading / unloading and transporting luggage to / from the accommodation compartment is arranged.

Further, in the fire detection system of one aspect of the present invention, when the smoke concentration equal to or higher than a predetermined threshold value is detected by the dimming smoke detector based on the control of the determination unit, the fire detection system moves to a position where the monitoring light beam is blocked. An instruction is output to the stacker crane so as not to prevent it.

Further, the fire detection system according to one aspect of the present invention further includes a detection result acquisition unit that acquires the detection result from the dimming type smoke detector, and the determination unit is said to be dimmed based on the detection result. It is determined whether or not the monitoring light beam emitted by the smoke detector is blocked by an obstacle different from the smoke.

Further, in one aspect of the present invention, a plurality of dimming smoke detectors are provided at different positions in the height direction in the region below the ceiling of the space to be monitored, and the monitoring target has a plurality of smoke detectors. The dimming smoke detector covers at least a non-containment compartment that is not the containment compartment, and the non-containment compartments are spaced along a first direction on the plane to be monitored. A plurality of smoke detectors are provided at intervals, and a plurality of smoke detectors are provided at intervals along a second direction different from the first direction. Among the plurality of dimming smoke detectors, the first dimming type is provided. The optical axis of the smoke detector is provided along the first direction, and the optical axis of the second dimming smoke detector is provided along the second direction. Based on the detection results from each of the smoke detectors, it is determined where in the non-containment compartment the smoke was detected.

As described above, according to the present invention, it is possible to detect a fire at an early stage in a monitoring area having a high ceiling.

It is a perspective view in the example of the rack warehouse 2 to which the fire detection system 1 which concerns on 1st Embodiment is applied. It is a top view and the side view in the example of the rack warehouse 2 to which the fire detection system 1 which concerns on 1st Embodiment is applied. It is a block diagram which shows an example of the functional structure of the determination device 10 which concerns on 1st Embodiment. It is a figure which shows the example of the detection result in the determination apparatus 10 which concerns on 1st Embodiment. It is a flowchart which shows the operation example of the determination apparatus 10 which concerns on 1st Embodiment. It is a top view in the example of the rack warehouse 2A to which the fire detection system 1A which concerns on 2nd Embodiment is applied.

Hereinafter, a fire detection system according to an embodiment of the present invention will be described with reference to the drawings.

(First Embodiment)
First, the fire detection system 1 of the first embodiment will be described. FIG. 1 is a perspective view of a rack warehouse 2 to which the fire detection system 1 according to the first embodiment is applied.
As shown in FIG. 1, the fire detection system 1 is applied to, for example, a rack warehouse 2. The fire detection system 1 monitors the fire in the rack warehouse 2 by detecting the smoke in the rack warehouse 2. The fire detection system 1 includes a smoke detector 6 and a determination device 10.
The rack warehouse 2 has a high ceiling, and for example, a plurality of racks 3 (rack 3-1, 3-2, 3-3, ...) Are provided. In the rack warehouse 2, for example, a stacker crane 7 (stacker cranes 7-1, 7-2, ...) That automatically travels is used to load / unload and transport cargo to / from the rack 3. Hereinafter, the case where the rack warehouse 2 is an automated warehouse in which cargo is taken in and out by the stacker crane 7 will be described as an example, but the rack warehouse 2 is not limited to this. The rack warehouse 2 may be, for example, a warehouse in which cargo is taken in and out and transported by manual crane or forklift work.

The rack 3 is a shelf for accommodating luggage. The rack 3 is a so-called metal rack in which, for example, a frame frame such as a pillar arranged in the z-axis direction in the height direction and a shelf plate arranged in the xy plane direction in the horizontal direction are formed of rod-shaped members. Is. In FIG. 1, in order to clearly show the shape of the rack, a case where the rack 3 is a rack provided with plate-shaped flat members on the upper surface and the lower surface is illustrated, but the present invention is not limited thereto. Such a flat member may not be provided on the upper surface and the lower surface of the rack 3. Further, the shelf board other than the upper surface and the lower surface of the rack 3 may be a plate-shaped flat member.
As shown in FIG. 1, the rack 3 is provided with a plurality of regions S for accommodating cargo in the height direction (z-axis direction) and the horizontal direction (x-axis direction). Further, a plurality of racks 3 are provided in the rack warehouse with a predetermined interval P. Here, the section in which the rack 3 is installed in the rack warehouse 2 is an example of the “accommodation section”. Further, the aisle section indicating the aisle is an example of a "non-accommodation section" in which the rack 3 is not installed.

The smoke detector 6 detects smoke. The smoke detector 6 is, for example, a dimming type smoke detector including a light emitting unit 4 and a light receiving unit 5. In the following, a case where the smoke detector 6 is a dimming type smoke detector will be described as an example.

The light emitting unit 4 of the smoke detector 6 is installed on the wall surface of any one of the rack warehouses 2, for example, and the light receiving unit 5 is installed on a wall surface different from the wall on which the light emitting unit 4 is installed. Further, the light emitting unit 4 and the light receiving unit 5 are installed so as to have a positional relationship in which the monitoring light beam emitted by the light emitting unit 4 is received by the light receiving unit 5. Then, the light projecting unit 4 irradiates the light receiving unit 5 with the monitoring light beam, so that the monitoring light ray reaches the light receiving unit 5 without dimming as it is in the absence of normal smoke, but is monitored by smoke. When the light beam is blocked, the light is dimmed and received by the light receiving unit 5. The smoke detector 6 detects the degree of smoke generation based on the amount of light of the monitoring light beam received by the light receiving unit 5. For example, the smoke detector 6 outputs a detection result for determining that there is no smoke when the amount of light of the monitoring light beam reaching the light receiving unit 5 is equal to or more than a predetermined threshold value, and when it is less than the predetermined threshold value, a fire is suspected. Outputs the detection result that determines that there is smoke.

The stacker crane 7 is provided, for example, in a passage in the rack warehouse 2, and automatically travels to load and unload luggage in and out of the rack 3. The stacker crane 7 includes, for example, a traveling carriage, an elevating platform, and a luggage transfer device such as a slide fork. The traveling carriage loads luggage from a predetermined luggage loading / unloading base (station) provided in the rack warehouse 2 and travels on the floor surface, and moves to a position where the luggage is accommodated. The lift is loaded with cargo, moves in the height direction from the floor, and lifts the cargo to a height at which the cargo is accommodated. The luggage transfer device transfers the luggage placed on the lift to a position where the luggage is accommodated. Alternatively, the luggage transfer device transfers the luggage from the shelf in which the luggage is stored to the lift. The lift will drop the cargo to the floor. The trolley moves the luggage to the station.

The determination device 10 acquires the detection result by the smoke detector 6 and the information regarding the operation of the stacker crane 7. The determination device 10 determines whether or not a fire has occurred based on the acquired information. When the determination device 10 determines that a fire has occurred, the determination device 10 outputs an alarm indicating that a fire has occurred.

Here, the position where the smoke detector 6 is installed will be described with reference to FIG.
FIG. 2 is a plan view and a side view of an example of a rack warehouse 2 to which the fire detection system 1 according to the first embodiment is applied. FIG. 2A shows a plan view of the rack warehouse 2, and FIG. 2B shows a side view of the rack warehouse 2.

As shown in FIG. 2A, a plurality of smoke detectors 6 (smoke detectors 6-1 and 6-2, ...) Are installed in the rack warehouse 2. FIG. 2A shows an example in which the smoke detector 6-1 is installed in the area E-1 and the smoke detector 6-2 is installed in the area E-2.
As shown in FIG. 2A, the smoke detector 6 is installed in a section of the rack warehouse 2 where the rack 3 is not installed, for example, an aisle. Further, the smoke detector 6 is installed so as to irradiate a monitoring ray along the longitudinal direction of the passage. As a result, the monitoring light beam of the smoke detector 6 is not blocked by the rack 3 or the luggage mounted on the rack 3. In the above, the case where the smoke detector 6 is provided in the passage between the two racks 3 has been illustrated as an example, but the smoke detector 6 is provided in the passage between the rack 3 and the wall surface of the rack warehouse 2. You may.
The smoke detector 6 is installed so as to irradiate a monitoring ray along the longitudinal direction of the passage. This makes it possible to detect a wider range of smoke than when the surveillance light beam is emitted along the short side of the passage.

As shown in FIG. 2B, the smoke detector 6 is installed in the area below the ceiling of the rack warehouse 2.
By the way, it is obligatory to install a fire detector in a building structure such as a house having a ceiling height of a predetermined ceiling height (for example, 20 [m]) or more. For this reason, a fire detector or the like (not shown), which is obligatory to be installed, is provided on the ceiling surface of the rack warehouse 2. It is possible to detect flames and smoke at a predetermined position close to the ceiling surface and the ceiling surface of the rack warehouse 2. In the following description, the area where flames and smoke can be detected by the fire detector, which has been obliged to be installed in the past, is referred to as a "ceiling portion". The ceiling portion is, for example, an area from the ceiling surface to a position at a height of 80% or more of the ceiling height. In the example of FIG. 2B, the ceiling portion is an area from the ceiling surface of the rack warehouse 2 to a predetermined distance D.
On the other hand, in the fire detection system 1 of the present embodiment, the smoke detector 6 is installed in the area below the ceiling of the rack warehouse 2. This makes it possible to detect smoke that does not reach the ceiling and smoke that floats in the air without rising to the ceiling, so that the safety of the rack warehouse 2 can be further improved.

Further, as shown in FIG. 2B, a plurality of smoke detectors 6 (smoke detectors 6-2, 6-3) may be installed at different positions in the height direction. That is, the smoke detectors 6-2 and 6-3 may be installed at different positions in the height direction between the ceiling surface and the floor surface of the rack warehouse 2. In this way, each of the smoke detectors 6 is installed at different positions in the height direction, so that each smoke detector 6 detects smoke floating in different positions in the height direction. Each of the smoke detectors 6 is 5 [m], 10 [m], or 3 depending on the scale of the building, the ceiling height, etc. in the structure in which the smoke detector 6 is installed, such as the rack warehouse 2. It may be installed at arbitrary intervals in the height direction such as every [m]. Further, each of the smoke detectors 6 may be installed at an arbitrary interval in the height direction according to the interval at which the rack 3 is installed in the rack warehouse 2. Further, when three or more smoke detectors 6 are installed in the height direction of the rack warehouse 2, each of the smoke detectors 6 may be installed at equal intervals in the height direction or at equal intervals. It does not have to be installed in. For example, when the smoke detectors 6-2, 6-3, 6-4 are installed in order in the height direction between the ceiling surface and the floor surface of the rack warehouse 2, the smoke detectors 6-2 and 6- The distance between the smoke detectors 6-3 and 6-4 may be set at 5 [m], and the distance between the smoke detectors 6-3 and 6-4 may be set at 3 [m].

Further, as described above, the smoke detector 6 senses smoke due to the dimming of the monitoring light beam. However, the surveillance rays are not always blocked only by smoke and can be blocked by some obstacle other than smoke. In particular, in an environment such as a rack warehouse 2 where cargo is frequently taken in and out, the cargo or the stacker crane 7 may block the monitoring light beam.
In the example of FIG. 2B, the monitoring ray of the smoke detector 6-2 is not blocked, but the monitoring ray of the smoke detector 6-3 installed under the smoke detector 6-2 is the stacker crane 7. It is blocked by -1.
In the fire detection system 1 of the present embodiment, it is determined whether the monitoring light beam is blocked by the smoke or an obstacle different from the smoke based on the detection result of the smoke detector 6. Then, it is determined that there is a possibility of fire when it is determined that the monitoring light beam is blocked by smoke, and it is determined that there is no possibility of fire when it is determined that the monitoring ray is blocked by an obstacle different from smoke. This improves the fire detection accuracy of the fire detection system 1. Hereinafter, a method for determining whether the monitoring ray is blocked by smoke or an obstacle different from smoke will be described.

FIG. 3 is a block diagram showing an example of the functional configuration of the determination device 10 according to the first embodiment.
The determination device 10 includes, for example, a detection result acquisition unit 20, an operation information acquisition unit 22, a movement instruction output unit 30, a determination unit 40, and a fire alarm output unit 50.
The detection result acquisition unit 20 acquires the detection results from each of the smoke detectors 6. The detection result acquisition unit 20 outputs the acquired detection result to the determination unit 40.
The operation information acquisition unit 22 acquires information (operation information) regarding the operation of the stacker crane 7. The operation information acquisition unit 22 acquires operation information by acquiring an operation command output to the stacker crane 7 from a control device (not shown) that controls the operation of the stacker crane 7, for example. The operation information includes, for example, the current position of each of the stacker cranes 7, and information indicating the start, operation stop, and the like of the operation (forward, reverse, ascending, descending, etc.). The operation information acquisition unit 22 outputs the acquired operation information to the determination unit 40.
Based on the control from the determination unit 40, the movement instruction output unit 30 outputs a movement instruction indicating an instruction regarding the movement of the stacker crane 7 to a control unit (not shown) of the stacker crane 7.
The fire alarm output unit 50 outputs a fire alarm. A signal instructing the output of an alarm is input to the fire alarm output unit 50 when the determination unit 40 determines that there is a possibility of fire. The fire alarm output unit 50 outputs an alarm when a signal instructing the output of the alarm is input from the determination unit 40. The fire alarm output unit 50 is provided with, for example, a speaker, and outputs a siren sound indicating a fire alarm. Further, the fire alarm output unit 50 may be provided with, for example, a communication device to report a fire to a fire department or the like.

The determination unit 40 acquires operation information from the detection result acquisition unit 22, and determines whether or not the stacker crane 7 is at a position that blocks the optical axis of the monitoring light beam of the smoke detector 6 based on the acquired operation information. The determination unit 40 stores, for each stacker crane 7, a position in the travel route of the stacker crane 7 that blocks the optical axis of the monitoring light beam of the smoke detector 6 in a storage unit (not shown). The determination unit 40 refers to the storage unit based on the acquired operation information, and determines whether or not the stacker crane 7 is at a position that blocks the optical axis of the monitoring light beam of the smoke detector 6. When the determination unit 40 determines that the stacker crane 7 is at a position that blocks the optical axis of the monitoring light beam of the smoke detector 6, the determination unit 40 determines that there is no possibility of fire. Even if the stacker crane 7 is not at a position that blocks the optical axis of the monitoring light beam of the smoke detector 6, the determination unit 40 is within a predetermined range from the position where the stacker crane 7 blocks the optical axis of the monitoring light beam. If the stacker crane 7 is located in the above position and is moving from that position toward a position that blocks the optical axis of the monitoring light beam, it may be determined that there is no possibility of fire.

The determination unit 40 determines whether or not there is a possibility of a fire from the detection result acquisition unit 20.
The detection result is input to the determination unit 40 from the detection result acquisition unit 20. The determination unit 40 determines whether or not there is a possibility of fire based on the amount of change in the detection result from the detection result acquisition unit 20 per unit time. Hereinafter, a method for determining whether or not there is a possibility of fire by the determination unit 40 will be described.

FIG. 4 is a diagram showing an example of a detection result in the determination device 10 according to the first embodiment. FIG. 4 is a diagram showing changes in the amount of light received by the light receiving unit 5 in time series when the monitoring light beam is blocked by smoke and when the monitoring light beam is blocked by an obstacle different from smoke. .. In FIG. 4, the horizontal axis indicates time, the vertical axis indicates the light intensity level, Th1 on the vertical axis indicates the normal level, Th2 indicates the preliminary alarm level, and Th3 indicates the fire alarm level. The normal level is a level that can be regarded as being received by the light receiving unit 5 without being blocked by the monitoring light beam. The preliminary warning level is the level at which smoke is suspected to be generated. The fire alarm level is a level at which it is determined that smoke due to a fire has been detected.
As shown in FIG. 4, when the monitoring ray is blocked by smoke, the amount of light of the monitoring ray gradually decreases over a relatively long time. Specifically, the light intensity of the monitoring light gradually decreases from the preliminary alarm level Th2 to the fire alarm level Th3 during the time T1 to T4. In this case, the amount of change per unit time is (Th3-Th2) / (T4-T1).
Further, when the surveillance light beam is blocked by an obstacle different from the smoke, the light intensity of the surveillance ray drops at once in a relatively short time. Specifically, the light intensity of the monitoring light beam drops from the preliminary alarm level Th2 to the fire alarm level Th3 at once during the time T2 to T3. In this case, the amount of change per unit time is (Th3-Th2) / (T3-T2).
For example, when the amount of light of the monitoring light received by the light receiving unit 5 changes from the preliminary alarm level to the fire alarm level, the determination unit 40 calculates the amount of change per hour, and the calculated amount of change is less than a predetermined threshold value. In some cases, it is judged that there is a possibility of fire. Further, when the calculated change amount is equal to or more than a predetermined threshold value, the determination unit 40 determines that there is no possibility of fire.
When the determination unit 40 determines that there is a possibility of fire, the determination unit 40 outputs a signal instructing the output of the alarm to the fire alarm output unit 50.

Further, when the detection result becomes less than the preliminary alarm level Th2, the determination unit 40 continuously monitors the change of the detection result thereafter. The determination unit 40 limits the movement of the stacker crane 7 in order to continuously monitor changes in the detection result. Specifically, when the detection result from the detection result acquisition unit 20 indicates a preliminary alarm level of less than Th2, the determination unit 40 issues a movement instruction to the stacker crane 7 via the movement instruction output unit 30 to operate the stacker crane 7. Is output to a control device (not shown) that controls. The movement instruction to the stacker crane 7 is, for example, an instruction prohibiting the stacker crane 7 from moving to a position that blocks the optical axis of the monitoring ray of the smoke detector 6. As a result, the determination unit 40 suppresses that the stacker crane 7 cannot continuously acquire whether or not there is a possibility of fire by moving to a position that blocks the monitoring light beam. That is, the determination unit 40 can continue monitoring when the generation of smoke is suspected, and can detect at an early stage the subsequent consequences, that is, whether the smoke grows or disappears and becomes undetectable. It will be possible.
In this way, the determination unit 40 can continue monitoring smoke by restricting the movement of the stacker crane 7 to a place where a fire is suspected, and further, by restricting the movement of the stacker crane 7, a place where a fire is suspected. It is possible to prevent luggage from being loaded, transferred, or relocated to the fire site, and the loading of luggage can add combustibles (burning grass) to the fire site or cause a fire. It is possible to prevent the fire from spreading due to the transfer of the lit luggage.

FIG. 5 is a flowchart showing an operation example of the determination device 10 according to the first embodiment.
The determination device 10 determines whether or not a fire has occurred in the rack warehouse 2 by executing the process shown in FIG. 5, for example, periodically or at a predetermined determination timing.
First, the detection result acquisition unit 20 of the determination device 10 acquires the detection result from the smoke detector 6 (step S1). The detection result acquisition unit 20 outputs the acquired detection result to the determination unit 40.
Next, the determination unit 40 determines whether or not the light intensity of the monitoring light beam is less than the fire alarm level based on the detection result (step S2). When the amount of light of the monitoring light is less than the fire alarm level, the determination unit 40 determines that the monitoring light is blocked by smoke based on the time required for the amount of light to decrease from the normal level to less than the fire alarm level. It is determined whether or not the fire is blocked by an obstacle different from the smoke (step S3). When the determination unit 40 determines that the monitoring light beam is blocked by smoke, it determines that there is a possibility of fire (step S4). The determination unit 40 outputs the detection result to the fire alarm output unit 50 (step S5). Then, the determination unit 40 ends this flowchart.

If it is determined in step S3 that the monitoring light beam is blocked by an obstacle different from smoke, the determination unit 40 determines that there is no possibility of fire (step S6). In this case, the determination unit 40 returns to step S1.

In step S2, the determination unit 40 determines whether or not the amount of light is less than the preliminary alarm level when the amount of light of the monitoring light is equal to or higher than the fire alarm level (step S7). When the amount of light is less than the preliminary alarm level, the determination unit 40 outputs a movement instruction for limiting the movement of the stacker crane 7 to the movement instruction output unit 30 (step S8). Then, the determination unit 40 returns to step S1.
On the other hand, when the light intensity of the monitoring ray is equal to or higher than the preliminary alarm level, the determination unit 40 returns to step S1 without outputting the movement instruction to the movement instruction output unit 30.

As described above, in the fire detection system 1 of the first embodiment, a plurality of rack warehouses 2 (an example of a “space to be monitored”) are located at different positions with respect to the height direction in the region below the ceiling. The dimming smoke detectors 6-2 and 6-3 are provided. As a result, in the fire detection system 1 of the first embodiment, the smoke is prevented from rising due to the luggage or the like housed in the rack warehouse 2, or the roof of the rack warehouse 2 is heated by the sunlight to form a boundary layer. As a result, even when the smoke cannot reach the ceiling surface, the smoke detector 6 can detect the smoke floating in the hollow, and can detect the fire at an early stage.

Here, as a comparative example 1, consider a configuration in which a flame detector is installed in the rack warehouse 2. In Comparative Example 1, when the cargo is stored in a high density (densely) in the rack warehouse 2, the fire point often becomes a blind spot for the flame detector installed on the ceiling or the wall surface, and the flame The light generated from the fire cannot be detected, and the fire detection function cannot detect the fire at an early stage. In addition, because the fire cannot be detected at an early stage, it is possible that the fire extinguishing may be insufficient by spraying the fire extinguishing agent with a sprinkler installed on the ceiling.
On the other hand, in the fire detection system 1 of the first embodiment, the cargo is densely and densely stored in the rack warehouse 2, and the smoke cannot rise to the ceiling and is smoldering. However, it is possible to detect smoke floating in the air, and it is possible to detect a fire at an early stage. If a fire can be detected early before the flame grows large, it will be possible to extinguish the fire by spraying a fire extinguishing agent with a sprinkler.

Further, in the fire detection system 1 of the first embodiment, the smoke detector 6 is installed so that different regions on the plane are in the detection range. As a result, in the fire detection system 1 of the first embodiment, even if there is smoke in different areas on the plane of the rack warehouse 2, each smoke detector 6 can detect the smoke at an early stage. It becomes possible to detect a fire.
Further, in the fire detection system 1 of the first embodiment, a plurality of racks 3 (an example of a “containment compartment”) are formed in the rack warehouse 2, and the smoke detector 6 is not provided with at least the rack 3. The containment area is the detection range. As a result, the fire detection system 1 of the first embodiment can detect smoke in the non-containment zone. Further, when the non-containment compartment is a passage, it becomes possible to detect smoke in the passage. Further, when the non-accommodation section is a section in which the stacker crane 7 is arranged, the area where the cargo is not accommodated can be used as the area where the stacker crane 7 is arranged, and the area where the stacker crane 7 travels or the stacker can be used. When smoke is floating in the area where the crane 7 rises or falls, the smoke detector 6 can detect the smoke and can detect a fire at an early stage.
Further, in the fire detection system 1 of the first embodiment, the direction of the optical axis emitted from the dimming smoke detector 6 is the direction along the plane direction of the non-containment compartment. As a result, the fire detection system 1 of the first embodiment can detect smoke at the same position in the height direction in the rack warehouse 2.

Further, in the fire detection system 1 of the first embodiment, the operation information acquisition unit 22 that acquires the operation information indicating the operation of the stacker crane that carries in and out the load, and the dimming smoke based on the operation information. By providing a determination unit 40 for determining whether or not the monitoring light beam emitted by the detector 6 is blocked by the stacker crane 7, when it is determined that the monitoring light beam is blocked by the stacker crane 7, the smoke detector 6 is used. It is possible to determine that there is no possibility of fire regardless of the detection result of, and it is possible to determine the possibility of fire more accurately.
Further, in the fire detection system 1 of the first embodiment, when the amount of light received by the light receiving unit of the monitoring light of the dimming smoke detector 6 is less than a predetermined threshold value based on the control of the determination unit 40, An instruction may be output to the stacker crane 7 so as not to move to a position that blocks the monitoring light beam. As a result, it becomes possible to continue monitoring at a place where a fire is suspected, and it is possible to determine the possibility of a fire more accurately.
Further, the fire detection system 1 of the first embodiment further includes a detection result acquisition unit 20 for acquiring the detection result from the dimming smoke detector 6, and the determination unit 40 reduces the number based on the detection result. It is determined whether or not the monitoring light beam emitted by the optical smoke detector 6 is blocked by an obstacle different from the smoke. As a result, in the fire detection system 1 of the first embodiment, if the optical axis of the smoke detector 6 is obstructed by an obstacle different from the smoke, there is a possibility of fire regardless of the detection result from the smoke detector 6. It is possible to determine that there is no fire, and it is possible to determine the possibility of fire more accurately.

(Second embodiment)
Next, the second embodiment will be described.
The second embodiment differs from the first embodiment described above in that a plurality of smoke detectors 6 are provided so that the monitoring rays intersect each other in the space to which the fire detection system 1 is applied. Hereinafter, the same configurations as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 6 is a plan view of an example of a rack warehouse 2A to which the fire detection system 1 of the second embodiment is applied.
As shown in FIG. 6, in the rack warehouse 2A of the second embodiment, a plurality of racks 3 are installed in each of the x-axis direction and the y-axis direction, and a matrix-shaped passage is formed. Specifically, racks 3-1, 3-4, and 3-7 are installed at predetermined intervals in the positive direction of the x-axis on the back side of the drawing. Further, the racks 3-2 and 3-3 are installed in order from the rack 3-1 in the negative direction on the y-axis.

Further, as shown in FIG. 6, in the fire detection system 1 of the second embodiment, a plurality of dimming smoke detectors 6 intersect with each other along the passage of the rack warehouse 2A. It is provided in. In FIG. 6, the smoke detector 6-4 is provided in the area E-3, and the smoke detector 6-5 is provided in the area E-4. The optical axis direction of each of the monitoring rays of the smoke detectors 6-4 and 6-5 is different from the optical axis direction of each of the monitoring rays of the smoke detectors 6-1 and 6-2.

In the second embodiment, the determination unit 40A of the determination device 10 determines where the smoke is detected based on the detection results from each of the smoke detectors 6. The determination unit 40A is, for example, a place where the monitoring rays of the smoke detectors 6-1 and 6-4 intersect when smoke is detected from both the smoke detector 6-1 and the smoke detector 6-4. That is, it is determined that smoke is detected in the region F. The determination unit 40 outputs information indicating the location where it is determined that smoke has been detected to the fire alarm output unit 50.

As described above, in the fire detection system 1 of the second embodiment, the smoke detector 6 has one direction (for example, the longitudinal direction) and the other direction (for example, the short direction) in the non-containment compartment of the rack warehouse 2. ), The determination unit 40 can determine where in the non-containment zone smoke was detected based on the detection results of each of the smoke detectors 6. As a result, in the fire detection system 1 of the second embodiment, when the non-accommodation section of the rack warehouse 2 is a large area, the monitoring light beam of the smoke detector 6 is irradiated over a long distance to generate smoke. Even when sensing, it is possible to determine where the smoke was detected in the non-containment area, and take necessary measures for initial fire extinguishing activities such as first checking the area around the place where the smoke was detected. can.

In the above description, a case where a plurality of smoke detectors 6 are arranged so that a matrix-like passage is formed in the rack warehouse 2A and a monitoring ray is irradiated along each passage has been described as an example. , Not limited to this. The smoke detector 6 does not have to be arranged so that a surveillance ray is emitted along each passage.
The fire detection system 1A of the present embodiment may be applied to the rack warehouse 2 as shown in FIG. 2A. In this case, one smoke detector 6 is arranged to irradiate the monitoring light in the x-axis direction, and the other smoke detector 6 penetrates the short sides of the plurality of racks 3-1 to 3-3. It is arranged so as to irradiate a monitoring beam in the y-axis direction. In this case, the fire detection system 1A is operated so that the cargo is not placed in the position where the monitoring light beam penetrates in the rack 3. Alternatively, when the luggage is placed at a position where the monitoring ray penetrates, the determination unit 40 determines that there is no possibility of fire.

In the above embodiment, the case where the fire detection system 1 is applied to the rack warehouse 2 (2A) has been described as an example, but the present invention is not limited to this. The fire detection system 1 may be applied to a factory, an exhibition hall, a theater, or the like having a high ceiling and a storage compartment partitioned by shelves, partitions, or the like, and a non-containment compartment such as a corridor or aisle.

Further, in the above embodiment, the case where the smoke detector 6 is a dimming type smoke detector has been described as an example, but the present invention is not limited to this. The smoke detector 6 may be a spot-type smoke detector or a suction-type smoke detector.
The spot-type smoke detector includes a light emitting unit and a light receiving unit provided inside the smoke detector. The light receiving unit is provided at a position where the monitoring light beam emitted by the light projecting unit is not directly received. When there is no normal smoke, the light receiving unit does not receive the monitoring light beam emitted by the light projecting unit, but when smoke enters the inside of the smoke detector, it receives the monitoring light beam diffusely reflected by the smoke. The spot-type smoke detector issues an alarm when the amount of light received by the light receiving unit is equal to or greater than a predetermined threshold value.
The suction type smoke detector includes a suction tube having an opening, a suction fan, and a smoke detector. The suction fan draws in air around the monitoring area provided with the opening. The smoke sensing unit senses smoke in the air taken in by the suction fan.

In the above embodiment, such a spot type or suction type smoke detector 6 may be provided at any position in the height direction in the area below the ceiling portion of the rack warehouse 2. Further, a plurality of dimming smoke detectors may be installed at predetermined intervals in the height direction and / and at predetermined intervals in the horizontal direction. In such a spot type or suction type smoke detector 6, the monitoring light beam is not blocked by the stacker crane 7 or is not irradiated with the monitoring light beam. Therefore, when the spot type or suction type smoke detector 6 is provided in the above embodiment, the determination unit 40 is based on the operation of the stacker crane 7 and the time-series change of the detection result from the smoke detector 6. , Does not perform the operation of determining whether or not the detection result by the smoke detector is valid.

(Modified example of the embodiment)
Next, a modification of the embodiment will be described. A modification of the embodiment is different from the above embodiment in that the smoke detector 6 is provided regardless of whether the storage compartment or the non-containment compartment is provided. The space to be monitored by the fire detection system 1A in this modification is a space having a ceiling height equal to or higher than a predetermined value, for example, a gymnasium, a warehouse, a factory, a theater, an exhibition hall, or the like.

In this modification, for example, a smoke detector 6 is provided in the accommodation compartment. For example, a smoke detector 6 is provided at a location in the rack warehouse 2 where the rack 3 is installed. In this case, the rack 3 has a structure in which, for example, the skeleton is formed by a rod-shaped frame or the like, and the side surfaces of the storage compartment are not partitioned by a plate or the like. In the space (containment compartment) partitioned by the upper and lower shelves of the rack 3, the cargo was irradiated along the longitudinal direction of the rack 3 unless a load having the same height as the space was placed on the lower shelf. The surveillance light is not blocked. Therefore, it is possible to detect smoke in the containment compartment.

In this modification, if the monitoring light beam is blocked by the luggage placed on the rack 3, it may be determined that there is no possibility of fire. If the detection result from the smoke detector 6 is higher than the preliminary alarm level suspected of causing a fire, the luggage is placed at a position that blocks the monitoring light beam of the smoke detector 6 that outputs the detection result. The operation of the stacker crane 7 may be controlled so as not to occur.

The determination device 10 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, and a storage device such as a hard disk built in a computer system. Further, a "computer-readable recording medium" is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and may be further realized by combining the above-mentioned functions with a program already recorded in the computer system.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.
For example, in a gymnasium or a factory, a storage compartment or a passage may not be provided, but the fire detection system 1 (1A) of the embodiment may be applied even in such a space. In such a space, as in the above description, for example, a dimming smoke detector may be installed at any position in the height direction in the area below the ceiling of the large space. Further, a plurality of dimming smoke detectors may be installed at predetermined intervals in the height direction and / and at predetermined intervals in the horizontal direction.

1 ... Fire detection system, 2 ... Rack warehouse, 3 ... Rack, 4 ... Light projector, 5 ... Light receiving unit, 6 ... Smoke detector, 7 ... Stacker crane, 10 ... Judgment device, 20 ... Detection result acquisition unit, 30 ... Movement instruction output unit, 40 ... Judgment unit, 50 output unit.

Claims (8)

Multiple dimming smoke detectors are installed at different positions in the height direction in the area below the ceiling of the space to be monitored .
A plurality of containment compartments are formed in the monitored object.
The dimming smoke detector has a detection range of at least a non-containment compartment other than the accommodation compartment.
An operation information acquisition unit that acquires operation information indicating the operation of a stacker crane that takes in and out and transports luggage to and from the accommodation section, and an operation information acquisition unit.
A determination unit that determines whether or not the monitoring light beam emitted by the dimming smoke detector is blocked by the stacker crane based on the operation information.
A fire detection system equipped with . Based on the control of the determination unit, if the amount of light received by the light receiving unit of the monitoring light of the dimming smoke detector is less than a predetermined threshold value, the stacker crane is instructed not to move to a position that blocks the monitoring light. The fire detection system according to claim 1 . It is further equipped with a detection result acquisition unit that acquires the detection result from the dimming smoke detector.
The first or second aspect of the present invention, wherein the determination unit determines whether or not the monitoring light beam emitted by the dimming smoke detector is blocked by an obstacle different from the smoke based on the detection result. Fire detection system. Multiple dimming smoke detectors are installed at different positions in the height direction in the area below the ceiling of the space to be monitored .
A plurality of containment compartments are formed in the monitored object.
The dimming smoke detector has a detection range of at least a non-containment compartment other than the accommodation compartment.
A plurality of the non-containment compartments are provided at intervals along the first direction on the plane to be monitored, and at the same time, a plurality of non-accommodation sections are provided at intervals along the second direction, which is a direction different from the first direction. Be,
Of the plurality of dimming smoke detectors,
The optical axis of the first dimming smoke detector is provided along the first direction.
The optical axis of the second dimming smoke detector is provided along the second direction.
Based on the detection results from each of the plurality of dimming smoke detectors, it is determined where in the non-containment compartment the smoke was detected.
Fire detection system. The fire detection system according to any one of claims 1 to 4, wherein the dimming smoke detector is installed so that different areas on a plane have a detection range. The fire detection system according to any one of claims 1 to 5 , wherein the direction of the optical axis of the monitoring light beam emitted from the dimming smoke detector is the direction along the plane direction of the monitoring target. The fire detection system according to any one of claims 1 to 6 , wherein the non-containment compartment is a passage compartment. The fire detection system according to any one of claims 1 to 7, wherein the non-containment compartment is a compartment in which a stacker crane for loading / unloading and transporting luggage to / from the accommodation compartment is arranged.

Images