JP7320356B2 - fire detection system - Google Patents

Description

The present invention relates to fire detection systems.

There is a fire detection system that detects the occurrence of a fire in a space such as a warehouse (see Patent Document 1). In such a fire detection system, a light-projecting part is provided on one of the walls facing each other near the ceiling, and a light-receiving element is provided on the other wall. A fire is detected when it is detected that the light received by the element is attenuated.

JP-A-7-182581

However, if the height from the floor surface to the ceiling surface of the space to be monitored is relatively high, and if a fire breaks out in the vicinity of the floor surface, the heat generated by the fire must reach the ceiling surface in order to activate the movable piece. It is necessary to reach a certain temperature or more, and it takes a long time until the movable piece operates. Also, in the summer, when the roof of the warehouse is heated, the room temperature near the ceiling rises. It is difficult to identify whether
On the other hand, in the case of a smoldering fire, the fire can be detected when the smoke reaches the vicinity of the ceiling. However, as mentioned above, the roof of the warehouse is heated in summer, etc., and the room temperature near the ceiling rises. Air circulation is disturbed and a so-called boundary layer is formed. When the air temperature in this boundary layer becomes higher than the air temperature generated by a smoldering fire, etc., the smoke from the fire stays in the lower part of the boundary layer and does not rise to the ceiling. This makes it difficult for the smoke detector to detect smoke.

The present invention has been made in view of such circumstances, and its object is to detect smoke drifting in the boundary layer in a space with a high height from the floor surface to the ceiling surface (hereinafter referred to as a large space). To provide a fire detection system capable of

In order to solve the above-described problems, one embodiment of the present invention is a fire detection system for monitoring a large space , wherein the large space has different temperatures from the floor surface to the ceiling. A space having a height in which a plurality of air layers can be formed . a suction-type smoke sensor is provided at a position, the suction- type smoke sensor comprises a plurality of suction tubes for sucking air from different regions of the second layer in a height direction, and the plurality of suction tubes By switching the air sucked by, the smoke in each of the different regions in the height direction is detected, and the smoke contained in the air sucked by the first suction pipe among the plurality of suction pipes is detected. , including the first suction tube, and switching to air sucked by a number of suction tubes less than the total number of the plurality of suction tubes, thereby including an area sucked by the first suction tube, A fire detection system that detects smoke in a smaller area than the entire area .

Moreover, in the fire detection system of one embodiment of the present invention, a plurality of the suction type smoke detectors are provided at different positions in the height direction.

Further, in the fire detection system of one embodiment of the present invention, the smoke sensor is an aspiration type smoke sensor, and the aspiration type smoke sensor has a plurality of openings for sucking air from different areas. and detecting smoke in each of the different regions by monitoring the air sucked through each of the plurality of openings.

Moreover, in the fire detection system of one embodiment of the present invention, the suction type smoke detectors are installed so that detection targets are different areas on a plane.

Further, in the fire detection system of one embodiment of the present invention, the suction-type smoke detector detects areas along different directions on a plane, and It further comprises a management device installed so as to overlap at least a part thereof, and for identifying a place where smoke is detected on the plane based on the detection result of each of the smoke detectors.

As described above, according to the present invention, smoke drifting in the boundary layer can be detected in a large space.

1 is a perspective view of a large space 2 to which the fire detection system 1 of the first embodiment is applied; FIG. 1A and 1B are a plan view and a side view of a large space 2 to which the fire detection system 1 of the first embodiment is applied; FIG. FIG. 10 is a side view of a smoke detector 30 with a smoke collecting plate to which a fire detection system 1A of a second embodiment is applied, and a plan view of a large space 2; It is a side view of the large space 2 to which 1 A of fire detection systems of 2nd Embodiment are applied. It is a side view of the large space 2 to which the fire detection system 1B of 3rd Embodiment is applied. It is a side view of the large space 2 to which 1 C of fire detection systems in the modified example 1 of 3rd Embodiment are applied. FIG. 11 is a plan view of a large space 2 to which a fire detection system 1D in Modification 2 of the third embodiment is applied; It is a side view of the large space 2 to which the fire detection system 1E in 4th Embodiment is applied. It is a top view of large space 2 to which fire detection system 1E in a 4th embodiment is applied. 10 is a cross-sectional view of the large space 2 shown in FIG. 9 taken along the line AA. FIG. FIG. 11 is a block diagram showing a configuration example of a smoke sensing main body 5 in a fourth embodiment; FIG. 11 is a block diagram showing a configuration example of a smoke sensing section 52 in a fourth embodiment; FIG. FIG. 13 is a diagram showing a configuration example of information stored in a scattering characteristic information storage unit 525 according to the fourth embodiment; FIG. FIG. 11 is a block diagram showing a configuration example of a control device 6 in a fourth embodiment; FIG. FIG. 14 is a sequence chart showing an operation example of the fire detection system 1E in the fourth embodiment; FIG.

A fire detection system according to an embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
First, the first embodiment will be described.
FIG. 1 is a perspective view of a large space 2 to which the fire detection system 1 of the first embodiment is applied.
The large space 2 is, for example, a gymnasium, a warehouse, a theater, an exhibition hall, or a space with a higher ceiling than a space (hereinafter referred to as a conventional space) having a ceiling height assumed for a conventional residence. The large space 2 may be a space having a high ceiling, and does not necessarily have to be a space having a large area in the plane direction. For example, the large space 2 may be the entrance hall of a condominium where the upper and lower floors are connected, or the entrance and living room of a detached house with an atrium.

The large space 2 has a higher ceiling than the conventional space. For this reason, a fire detector (not shown), which must be installed in a space with a ceiling height of a predetermined ceiling height (for example, 20 m) or higher, must be installed on the ceiling surface of the large space 2 or at a position close to the ceiling surface. is installed in Such fire detectors, which have been obligated to be installed in the past, enable detection of flames and smoke on the ceiling surface of the large space 2 and at predetermined positions near the ceiling surface. In the following description, the area in which flames and smoke can be detected by fire detectors that have been required to be installed is referred to as a "ceiling". The ceiling part is, for example, an area from the ceiling surface in FIG. 1 to a predetermined distance D. As shown in FIG. Also, the ceiling part is, for example, a region from the ceiling surface to a position at a height of 80% or more of the ceiling height.

In the large space 2, the distance from the floor surface to the ceiling is greater than the height of the ceiling in the conventional space. Therefore, when smoke or heat is generated near the floor surface of the large space 2, the smoke or hot air flow rises, and a plume having a trumpet-shaped outline at the boundary with the surrounding air is generated. . It takes a longer time for the smoke in the generated plume to rise and reach the ceiling in the large space 2 with a high ceiling than in the conventional space. A fire has the property of gradually expanding with the passage of time, and the plume also increases in thickness as the fire expands. In other words, in the large space 2, when the smoke in the plume generated near the floor surface is detected by the fire detector provided on the ceiling, the fire has passed the initial stage where it is relatively easy to extinguish. It is conceivable that the If the fire has grown large when the smoke in the plume is detected by the fire detector, it may not be possible to extinguish it even if the sprinkler (not shown) installed on the ceiling is activated.
In addition, in the large space 2, since the distance from the floor to the ceiling is large, a temperature difference is likely to occur in the height direction, and a layer (boundary layer) with different temperatures is formed between the floor and the ceiling. Air circulation can be hindered at the interfaces of different layers of . In such a case, it is assumed that the plume generated near the floor surface of the large space 2 is prevented from rising by the boundary surface and does not reach the ceiling. In such a case, it may be difficult to detect flames or the like with a conventional fire detector provided on the ceiling. The fire detection system 1 of the present embodiment detects smoke in the area below the ceiling of the large space 2, that is, in the area where it is difficult to detect flames and smoke with conventional fire detectors that must be installed. make it possible.

As shown in FIG. 1, in the large space 2 of the embodiment, a smoke sensor 10 is provided at any position in the height direction below the ceiling. Hereinafter, in this embodiment, the case where the smoke sensor 10 is a dimming type smoke sensor will be described as an example, but the smoke sensor 10 is not limited to this, and the smoke sensor 10 is a so-called spot type smoke sensor. It may be an aspiration type smoke detector. The spot-type smoke sensor and the suction-type smoke sensor will be described in detail in other embodiments.

Note that FIG. 1 illustrates a case in which no accommodation section such as a rack shelf is provided, but an accommodation section may be provided in the large space 2 . In this case, the smoke detector 10 detects a non-accommodating section such as a passage between rack shelves and a space above the upper surface of the rack shelf.

A dimming smoke detector 10 detects smoke. As shown in FIG. 1, a light projecting section 11 and a light receiving section 12 are provided. For example, the dimming type smoke sensor 10 detects smoke by installing the light projecting unit 11 and the light receiving unit 12 with a predetermined distance therebetween. In the example of FIG. 1, in the large space 2, the light projecting unit 11 is installed on the left wall surface, and the light receiving unit 12 is installed on the right wall surface.
The light projecting unit 11 irradiates a monitoring light beam toward the light receiving unit 12 . Also, the light receiving unit receives the monitoring light beam emitted by the light projecting unit 11 . If there is no smoke, the monitor light emitted by the light projecting section 11 reaches the light receiving section 12 without being attenuated. However, the monitoring light emitted by the light projecting unit 11 is attenuated when there is smoke on the optical axis of the monitoring light compared to when there is no smoke. The dimming smoke sensor 10 measures the amount of monitoring light that has reached the light receiving section 12, and determines the presence or absence of smoke based on the measurement result. The dimming type smoke sensor 10 determines that there is smoke, for example, when the light amount of the monitoring light beam reaching the light receiving section 12 is less than a predetermined threshold value.

FIG. 2 is a plan view and a side view of a large space 2 to which the fire detection system 1 of the first embodiment is applied. 2(a) is a plan view of the large space 2, and FIG. 2(b) is a side view of the large space 2. As shown in FIG.
As shown in FIG. 2(a), a plurality of light projecting units 11 (light projecting units 11-1 to 11-7) are provided on the left wall surface of the large space 2, and a plurality of light receiving units 12 (light receiving unit 12) are provided on the right wall surface. -1 to 12-7) are provided, respectively, and each pair of the light emitting unit 11 and the light receiving unit 12 constitutes a dimming type smoke sensor 10 (smoke sensor 10-1 to 10-N). ing. (where N is an integer from 1 to 7). Each of the light projection units 11 is provided, for example, at the same position in the z-axis direction and at positions separated from each other by a distance E in the y-axis direction, and installed so as to irradiate the monitor light beam in parallel with the x-axis direction. As a result, each of the dimming smoke sensors 10 is an area including a plane whose axial direction is the longitudinal distance of the large space 2 and whose y-axis direction is the distance E, and which does not overlap each other. Detect smoke in each. In other words, the fire detection system 1 of the embodiment is installed so that different regions on a plane are subject to detection. This makes it possible to detect smoke in areas different from each other in the planar direction.

Here, the interval (distance E in FIG. 2(a)) at which the dimming type smoke detectors 10 are arranged is, for example, about the same as the diameter of the plume in the initial state where the fire can be extinguished relatively easily. It can be less than that. According to experiments, the diameter of the plume in the initial state that can be extinguished relatively easily is about 4 m. By arranging the dimming type smoke detectors 10 at an interval of 4 m or less, even if a plume is generated in the large space 2, it is possible to detect the generated plume in the initial state. .

As shown in FIG. 2(b), in the large space 2, a plurality of dimming smoke sensors 10 are installed at different positions in the height direction. In FIG. 2(b), a plurality of dimming smoke sensors 10 (dimming smoke sensors 10-7, 10-8) are arranged in a predetermined direction in the height direction (z-axis direction) of the large space 2. An example in which they are installed at intervals of a distance F is shown. As a result, each of the dimming smoke sensors 10 can detect smoke in different areas in the height direction in the large space 2 . The interval (distance F in FIG. 2(b)) at which the dimming smoke detectors 10 are arranged is such that a boundary layer is formed in the large space 2, so that smoke caused by a fire that occurs near the floor surface reaches the ceiling. may be determined in consideration of the possibility that it will not rise to For example, the dimming smoke detectors 10 are installed in the large space 2 at a distance of about 10 m from each other in the height direction.
The height direction distance (layer thickness) of the boundary layer varies depending on the structure and use of the building forming the large space 2, the surrounding environment, and the season. For example, in factories, warehouses, etc., whose roofs are thin compared to general residential buildings, the thickness of the boundary layer increases due to the temperature rise of the roofs due to the irradiation of sunlight in the summer. On the other hand, in a hotel or the like where a heat-insulating member is used for the roof or the like, a temperature difference in the height direction in the space is unlikely to occur, so the boundary layer becomes thin.
A dimming smoke sensor 10 is desirably provided, for example, in the vicinity of the interface between layers with different temperatures formed in the large space 2 . Considering that the thickness of the boundary layer varies depending on the season, the positions of the boundary surfaces of layers with different temperatures when the boundary layer is the thinnest and the boundary surfaces of layers with different temperatures when the boundary layer is the thickest are determined. A dimming smoke sensor 10 is preferably provided in each vicinity. That is, the distance F may be determined by variations in the boundary layer thickness that occur in the large space 2 .

In the above description, the interval at which the dimming smoke sensors 10 are arranged in the planar direction is not limited to about the diameter of the plume in the initial state. Also, the distance at which the dimming smoke sensors 10 are arranged in the height direction is not limited to the distance at which the plume rises in the initial stage. The interval at which the dimming smoke sensors 10 are arranged may be arbitrarily determined according to the area and shape of the large space 2 in the plane direction, the shelves and fixtures installed in the large space 2, and the like.

In the fire detection system 1 , for example, a dimming type smoke sensor 10 is provided so that the optical axis direction of the monitoring light is along the longitudinal direction of the large space 2 . As a result, compared to the case where the same number of dimming type smoke sensors 10 are installed so that the monitor light is emitted in the lateral direction, the monitor light can be emitted for a longer distance. can detect smoke over a wider range. Further, in the fire detection system 1, a dimming type smoke sensor 10 is installed so that the monitor light is not blocked by a shield. For example, if the large space 2 is a warehouse or the like in which shelves and the like are installed, it is conceivable that the monitor light beams will be blocked by the shelves and luggage. In such a case, the detection range of the dimming type smoke sensor 10 is set to a line-of-sight area that is not provided with an aisle or a shelf for storing luggage.

As described above, in the fire detection system 1 of the first embodiment, the dimming smoke sensor 10 is provided at any position in the height direction in the area below the ceiling of the large space 2 .
If the rise in room temperature near the ceiling creates a boundary layer that impedes air circulation in the vertical direction, causing the smoke to float in the air without rising to the ceiling, a conventional ceiling-mounted fire detector should be used. cannot detect smoke. Even in this case, in the fire detection system 1 of the first embodiment, since the dimming type smoke sensor 10 is provided below the ceiling of the large space 2, such smoke floating in the air can be detected. can do. This makes it possible to detect smoke drifting in the boundary layer, which is difficult to detect with conventional fire detectors.
In addition, in the fire detection system 1 of the first embodiment, even if a fire breaks out near the floor, before the smoke rises from near the floor to the ceiling, the attenuator provided below the ceiling is Smoke can be detected by the optical smoke sensor 10, and a fire can be detected early.

Further, in the fire detection system 1 of the first embodiment, a plurality of dimming smoke sensors 10 may be provided at different positions in the height direction. As a result, in the fire detection system 1 of the first embodiment, even if the position of the boundary layer formed by the rise in the room temperature near the ceiling differs depending on how the temperature rises on that day, the boundary layer can detect drifting smoke.
Further, the fire detection system 1 of the first embodiment may be installed so that different areas are subject to detection on a plane. As a result, if a plurality of dimming smoke detectors 10 are installed at intervals of about the diameter of the plume in the initial state of the fire, smoke can be detected in the initial state where the fire can be extinguished relatively easily. can detect fires early.

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 3 and 4. FIG.
The fire detection system 1A of the second embodiment differs from the first embodiment in that the smoke sensor 10A is a spot type smoke sensor. In the fire detection system 1A of the second embodiment, for example, the large space 2 is a rack warehouse with a plurality of shelves 3 (see FIG. 3(b)). Moreover, in this embodiment, the same code|symbol is attached|subjected to the same structure as 1st Embodiment mentioned above, and the description is abbreviate|omitted.
FIG. 3 is a side view of a smoke detector 30 with a smoke collecting plate of the second embodiment, and a plan view of a large space 2 to which the fire detection system 1A is applied. FIG. 3(a) is a schematic cross-sectional view of a smoke detector 30 with a smoke collecting plate as viewed from the side, and FIG. 3(b) is a plan view of a large space 2 to which the fire detection system 1A is applied.
FIG. 4 shows a side view of a large space 2 to which the fire detection system 1A of the second embodiment is applied.

As shown in FIG. 3(a), in the second embodiment, a smoke detector 30 with a smoke collecting plate is provided. The smoke sensor 30 with a smoke collecting plate is an example of a spot-type smoke sensor, and includes a spot-type smoke sensor 10A and a smoke collecting plate 20, for example.
The smoke sensor 10A includes, for example, a light-emitting part and a light-receiving part, which are separately provided inside the smoke sensor 10A. In the spot-type smoke sensor 10A, the light receiving section is provided at a position different from the optical axis direction of the monitoring light emitted by the light emitting section. Therefore, the light-receiving part does not receive the monitoring light emitted by the light-emitting part in a normal state without smoke, but receives the monitoring light diffusely reflected by the smoke when smoke enters the smoke sensor 10A. . The smoke sensor 10A determines the presence or absence of smoke by measuring the light intensity of the monitoring light beam that has reached the light receiving portion. The smoke sensor 10A determines that there is smoke, for example, when the light amount of the monitoring light beam that has reached the light receiving portion is equal to or greater than a predetermined threshold.

As shown in FIG. 3A, the smoke collecting plate 20 is, for example, a dome-shaped smoke collecting plate. The smoke collecting plate 20 is provided so that its inner surface faces the floor surface of the large space 2 . A smoke sensor 10A is provided inside the smoke collecting plate 20 and at the center of the surface viewed from the top.
By providing the smoke sensor 10A in the center of the smoke collecting plate 20, when the smoke rising from the floor surface reaches the smoke collecting plate 20, the smoke is collected from the peripheral side of the inner circumference of the smoke collecting plate 20 to the central side. and reaches the inside of the smoke sensor 10A. This makes it easier to detect smoke over a wider area in the planar direction than when a smoke sensor without the smoke collecting plate 20 is used.

As shown in FIG. 3B, the fire detection system 1A is provided with a plurality of shelves 3 (shelf 3-1, 3-2). Each of the shelves 3 is installed with a predetermined distance G from each other so that the front surfaces of the shelves are parallel to the x-axis direction, and an atrium space M is provided between the shelves 3-1 and 3-2. It is formed. A smoke detector 30 with a smoke collecting plate is provided on each of the shelves 3 so that the outer peripheral portion of the smoke collecting plate 20 projects into the space M. In the example of FIG. 3(b), the shelf 3-1 is equipped with smoke detectors 30-1 to 30-3, and the shelf 3-2 is equipped with smoke detectors 30-4 to 30-6. provided respectively.

The smoke detector 30 with a smoke collecting plate is installed, for example, on the lower surface side of the shelf plate of the shelf 3 and detects smoke below the shelf plate and in the space M below the shelf plate. For example, in a rack warehouse, smoke generated on the floor is blocked by packages and shelf boards and is prevented from rising and drifts on the lower surface of the shelf board. Although it is conceivable that the smoke detector 30 with a smoke collecting plate is provided on the lower surface side of the shelf plate so that the outer peripheral part of the smoke collecting plate 20 protrudes into the space M, Smoke can be detected under the smoke sensor with smoke plate 30 .
Moreover, in a rack warehouse, the shelf board may function as a shelf board by forming it with a bar-shaped member instead of a plate-shaped member. In this case, a mesh-like, line-like, or truss-like frame structure is formed parallel to the surface on which the load is placed. In such a case, the shelf board does not block the smoke, but if a load is placed on the shelf board, the load may block the smoke. Even in such a case, by providing the smoke sensor 30 with a smoke collecting plate on the lower surface side of the shelf plate, it is possible to detect the smoke drifting on the lower surface of the luggage.

As shown in FIG. 4, the shelf 3-3 may be provided with a plurality of shelf boards in the height direction. In this case, in the fire detection system 1A of the embodiment, the accommodation compartments S (accommodation compartments S-1 to S-3) divided in the height direction by the shelf boards are provided with a plurality of smoke detectors 30 with smoke collecting plates. be provided. In the example of FIG. 4, smoke detectors 30-4 to 30-6 with smoke collecting plates are installed at the second highest position in the accommodation section S-1 which is provided at the highest position of the shelf 3-3. The storage compartment S-2 has smoke detectors with smoke collectors 30-7 to 30-9, and the lowest storage compartment S-3 has smoke detectors with smoke collectors 30-10 to 30-. 12 are provided respectively. By installing one or a plurality of smoke detectors 30 with smoke collecting plates in each accommodation section S, smoke in the entire accommodation section S can be detected.

It should be noted that in FIG. 4, for each of the accommodation compartments S, there is one cluster between two columns H (eg, between columns H-1 and H-2, between columns H-2 and H-3). An example in which the smoke detector 30 with a smoke plate is installed is shown, but the plurality of pillars H (pillars H-1 to H-4) provided on the shelf 3-3 are pillars that support the shelf, The accommodation section S is not partitioned by a plane parallel to the side surface of the accommodation section S.

In the above-described embodiment, the large space 2 is formed by installing the racks 3 in a rack warehouse. It may also be a space surrounded by a plurality of floors, such as an atrium formed in a building. In such a building such as a hotel, the outer periphery of the smoke collecting plate 20 is provided so as to protrude from each floor to the atrium, so that the smoke floating in the air of the large space 2 can be detected, and a fire can be prevented. early detection of

As described above, in the fire detection system 1A of the second embodiment, the smoke sensor 10A is a spot-type smoke sensor, and the inner surface of the spot-type smoke sensor 10A faces the floor surface. It is provided so as to be accommodated in the inner surface of the dome-shaped smoke collecting plate 20 provided as described above. As a result, in the fire detection system 1A of the second embodiment, the smoke reaching the smoke collecting plate 20 can be collected and detected by the smoke sensor 10A, and a smoke sensor without the smoke collecting plate 20 is used. It is possible to detect smoke in a wider range in the planar direction than in the case of the conventional method.

In addition, in the above-described second embodiment, the case where the smoke collecting plate 20 has a dome shape has been described as an example, but the present invention is not limited to this. The smoke collecting plate 20 may have any shape as long as it does not interfere with loading and unloading of the cargo placed on the shelf 3. For example, it may have a conical shape or a pyramidal shape. Other shapes may be used.

(Third embodiment)
The fire detection system 1B of the third embodiment differs from the above-described embodiments in that the smoke sensor 10B is a suction type smoke sensor. Moreover, in this embodiment, the same code|symbol is attached|subjected to the same structure as 1st Embodiment mentioned above, and the description is abbreviate|omitted.
FIG. 5 is a side view of a large space 2 to which the fire detection system 1B of the third embodiment is applied.
As shown in FIG. 5, in the fire detection system 1B of the third embodiment, the smoke sensor 10B is arranged near the floor surface of the large space 2, for example. The smoke sensor 10B includes a main pipe 13, a switching valve 14, and a plurality of suction pipes 15 (suction pipes 15-1 to 15-6).
The switching valve 14 is provided near the ceiling of the large space 2, for example. A connection portion on one side of the switching valve 14 is connected to the smoke sensor 10B via the main pipe 13 . A plurality of suction pipes 15 are connected to the connection portion on the other side of the switching valve 14 .
Each of the suction pipes 15 is arranged so as to extend in the horizontal direction (x-axis direction) along the ceiling to near the position on the plane of each smoke suction area in the large space 2, and further The suction pipe is arranged to extend toward the floor in the height direction (z-axis direction). The tip of the suction tube 15 is formed with an opening that is positioned at the height of the smoke suction area. In this manner, a plurality of suction tubes 15 are arranged so that openings are provided in different areas in the height direction or horizontal direction of the space to be monitored.

Further, as shown in FIG. 5, when the shelf 3 is provided in the large space 2 and a plurality of accommodation compartments S (accommodation compartments S-1 to S-3) are provided in the height direction, any arbitrary The opening of the suction tube 15 may be provided at a position or on the lower surface side of the shelf board of each stage of the shelf 3 . As a result, it is possible to target any area of the accommodation section S in the height direction, and to suck the smoke in the area through the corresponding opening of the suction pipe 15 . In some cases, the shelves are formed by arranging bar-shaped members in parallel instead of using plate-shaped members for the shelves. In such a case, the suction tubes 15 may be arranged so that the openings are provided on the upper surface side of the storage section S of the shelf 3 .

In addition, a plurality of openings of the suction pipes 15 may be provided for each accommodation section S that differs in the height direction. In FIG. 5, the openings of the suction tubes 15-1 and 15-4 in the storage section S-1, the openings of the suction tubes 15-2 and 15-5 in the storage section S-2, and the openings of the suction tubes 15-2 and 15-5 in the storage section S-1 3 shows an example in which respective openings of the suction tubes 15-3 and 15-6 are provided. By providing the openings of the suction pipes 15 in the accommodation compartments S, smoke in each of the accommodation compartments S can be detected.

In FIG. 5, as in FIG. 4, each accommodation section S is provided with a plurality of pillars H (pillars H-1 to H-6). , the accommodation section S is not divided into a plurality of sections on a plane parallel to the side surface of the accommodation section S.

The suction type smoke sensor 10B has a suction fan inside, and by sucking air with this suction fan, the air sucked from the vicinity of the opening of each suction pipe 15 is directed to the smoke sensor 10B. Introduce. Thereby, the smoke sensor 10B detects smoke targeting each area in the large space 2 .

Further, the smoke sensor 10B controls the switching valve 14 to switch the target suction pipe 15 to be sucked every predetermined time or at a specific timing, and sequentially senses the air sucked from each suction pipe 15. introduced into the vessel 10B. As a result, smoke can be selectively detected in the area near the opening of the selected suction pipe 15 in the large space 2 as the detection target.
Further, the smoke sensor 10B identifies which suction pipe 15 is selected based on the switching instruction, thereby recognizing in which region in the large space 2 smoke is detected or not detected. be able to.

The smoke sensor 10B may instruct the switching valve 14 to switch the suction pipe 15, for example, every predetermined time (for example, every 5 seconds). For example, when the total distance of the suction pipe 15 and the main pipe 13 from the opening of the suction pipe 15 to the smoke sensor 10B is about 100 m, the time required for the air near the opening to reach the smoke sensor 10B is It is about several tens of seconds (about 20 to 30 seconds). In this way, the smoke sensor 10B can reliably introduce the air near the opening into the smoke sensor 10B by switching the switching valve 14 based on the distance between the suction pipe 15 and the main pipe 13. , it is possible to detect smoke more accurately.

Further, when the smoke from a certain suction pipe 15 indicates a value equal to or higher than a predetermined smoke density, the smoke sensor 10B controls the switching valve 14 to suck the smoke indicating a value equal to or higher than the predetermined smoke density. The smoke detection may be performed by limiting to the smoke from the suction pipe 15 and the surrounding suction pipes 15 . By limiting smoke detection to suspected fire areas, it is possible to increase the accuracy of fire detection and expedite the warning time.

Alternatively, the large space 2 (monitoring area) may be divided into a plurality of sections, and a smoke sensor 10B may be assigned to each of the divided sections for monitoring by the plurality of smoke sensors 10B. If the number of suction tubes 15 to be switched by one smoke sensor 10B increases, it takes time to sequentially switch all the suction tubes 15 and determine the presence or absence of smoke. Although it is conceivable that the interval will increase and the fire may not be detected early, by dividing the large space 2 into a plurality of areas in this way and monitoring the entire building with a plurality of smoke detectors 10B, suction Each of the pipes 15 can be checked in a short cycle, and a fire can be detected early.
Note that the monitoring area may be divided in the height direction (vertical direction), may be divided in the plane direction (horizontal direction), or may be divided in the height direction and the horizontal direction.

As described above, in the fire detection system 1B of the third embodiment, the suction-type smoke sensor 10B includes a plurality of suction tubes 15 having openings for sucking air from different regions. By switching the air drawn by the tube 15, smoke is detected in each of the different areas. As a result, the fire detection system 1B of the third embodiment can detect smoke generated in each of the different areas in the large space 2. FIG.

(Modification 1 of the third embodiment)
Modification 1 of the third embodiment is different from the above-described third embodiment in that one suction tube 15 is provided with a plurality of openings.
FIG. 6 is a side view of a large space 2 to which the fire detection system 1C in Modification 1 of the third embodiment is applied.

As shown in FIG. 6, in this modified example, one suction pipe 15 is provided along the planar direction in each of regions that are different from each other in the height direction. That is, the suction tube 15-1 in the storage section S-1, the suction tube 15-2 in the storage section S-2, and the suction tube 15-3 in the storage section S-3 are arranged along the x-axis direction. be provided. Each suction tube 15 is provided with a plurality of openings 150-154 so that air around each opening can be sucked. For example, in the suction tube 15-1, the opening 150 is located between the pillars H-1 and H-2 in the storage compartment S-1, and the opening 151 is located between the pillars H-2 and H-2 in the storage compartment S-1. 3, opening 152 near between pillars H-3 and H-4 in containment section S-1, opening 153 near pillars H-4 and H-5 in containment section S-1. and the opening 154 can suck air in each of the vicinity between the columns H-5 and H-6 in the containment compartment S-1. Thus, if one suction tube 15 is provided in the storage section S, the entire storage section S can be monitored, and the system can be simplified compared to the case where a plurality of suction tubes 15 are provided in the storage section S. It becomes possible to

In addition, although the case where each suction tube 15 is provided along the x-axis direction of a plane direction (horizontal direction) was illustrated and demonstrated above, the suction tube 15 may be provided along the y-axis direction. In this case, each of the suction tubes 15 can monitor areas of each of the accommodation compartments S-1 to S-3 that are different in the height direction.

Also, the suction pipe 15 may be provided along the z-axis direction, which is the height direction (longitudinal direction). For example, when the suction pipe 15 is provided along the height direction in the region between the pillars H-1 and H-2, the suction pipe 15 is located in the region between the pillars H-1 and H-2. The space from containment compartment S-1 to containment compartment S-3 can be monitored.
Also, a plurality of suction tubes 15 having a plurality of openings as described in this modified example may be provided in the planar direction (or the height direction).
As described above, in the first modification of the third embodiment, by providing a plurality of openings in the suction tube 15, a smaller number of suction tubes 15 can be used as compared to the case where the plurality of openings is not provided. , it is possible to monitor a wider area.

(Modification 2 of the third embodiment)
Modification 2 of the third embodiment differs from the above-described third embodiment in that the suction pipes 15 are provided so that the monitoring regions of the plurality of suction-type smoke sensors 10B intersect each other.
FIG. 7 is a plan view of a large space 2 to which the fire detection system 1D in Modification 2 of the third embodiment is applied.

As shown in FIG. 7, in the fire detection system 1D of this modified example, a plurality of smoke detectors 10B (smoke detectors 10B-1, 10B-4, and 10B-5) are arranged such that their suction tubes 15 are aligned along the x-axis. are spaced apart along the Also, a plurality of smoke sensors 10B (smoke sensors 10B-6 to 10B-9) are provided with their suction tubes 15 spaced apart along the y-axis. In other words, in the fire detection system 1D of this modified example, a plurality of smoke sensors 10B are provided so that their monitoring areas intersect each other.

This modification includes a management device 100 that manages each of the smoke sensors 10B.
The management device 100 acquires detection results from each of the smoke sensors 10B. The management device 100 identifies the location where smoke was detected based on the acquired detection result. For example, when smoke is detected from both the smoke detector 10B-4 and the smoke sensor 10B-7, the management device 100 monitors the area monitored by the smoke detector 10B-4 and the smoke sensor 10B-7. , that is, the area K where smoke is detected.
In Modified Example 2 of Embodiment 3, the place where smoke is detected can be specified by the management device 100, so that it is possible to quickly and reliably extinguish a fire that has occurred.

In the modified example described above, the case where the monitoring area of the smoke sensor 10B is provided along the x-axis direction or the y-axis direction has been described as an example. It suffices that the monitoring regions of the devices 10B are provided along different directions.

In the third embodiment described above, the suction tube 15 may have a cylindrical shape, or may have a polygonal cross section (including triangles, squares, and other polygons).
Further, in the third embodiment described above, the case where the suction tube 15 has a substantially straight tubular shape has been described as an example, but the suction tube 15 may have a bent portion. In this case, the suction pipe 15 may, for example, be arranged in a loop so as to surround the inside of the outer peripheral portion in the plane of the large space 2, or may be provided with a large number of bends to form an S shape or a crank shape. It may be laid out and piped.
Also, the suction tube 15 may be branched. A single suction tube 15 may be branched in a tree shape like a tournament table, and an opening may be provided at each branched end.

(Fourth embodiment)
Next, a fourth embodiment will be described. This embodiment differs from the above-described embodiments in that the fire detection system 1 uses the frame of the shelf provided in the large space 2 as a suction pipe for suction-type smoke detection.

A large space 2 to which the fire detection system 1E of the fourth embodiment is applied will be described with reference to FIGS. 8 to 10. FIG. 8 is a side view of the large space 2. FIG. 9 is a plan view of the large space 2. FIG. FIG. 10 is a cross-sectional view of the large space 2 shown in FIG. 9 taken along the line AA. In this embodiment, the X-axis direction in FIGS. 8 to 19 is the left-right direction, the Y-axis direction is the depth direction, and the Z-axis direction is the height direction.

As shown in FIG. 8, the fire detection system 1E includes, for example, a large space 2, a shelf 4 provided in the large space 2, a smoke sensing main body 5, and a control device 6.
The large space 2 is a so-called rack warehouse provided with shelves 4 (racks).
The shelf 4 is a shelf provided with a plurality of storage sections (section (circle A) to section (circle F) in FIG. 8) for storing cargo carried into the large space 2 .
The smoke sensing main body 5 detects the presence or absence of smoke (smoke concentration) contained in the sucked air.
The control device 6 controls a switching unit 43, which will be described later, to detect smoke in a specific section.

The shelf 4 is provided, for example, so that the longitudinal direction of the shelf 4 is along the horizontal direction of the large space 2 . A plurality of shelves 4 may be provided in the large space 2 .

The shelf 4 includes, for example, suction tubes 41 (suction tubes 41-1 to 41-6), openings 42 (openings 42-1 to 42-6), switching sections 43 (switching sections 43-1 to 43- 9) and a shelf board T (shelf boards T-1 to T6).
In this embodiment, the frame of the shelf 4 is made of a hollow member and functions as a suction pipe through which sucked air flows. That is, the pillars of the shelf 4 erected in the height direction function as the suction pipes 41-1 to 41-3, and the beams arranged in the horizontal direction function as the suction pipes 41-4 to 41-6.
The suction tubes 41-1 to 41-6 may be independent pipes, or all or part of the suction tubes 41-1 to 41-6 may be unitized.

A through hole is formed in the suction tube 41 and an opening 42 is provided in the through hole.
A plurality of openings 42 may be provided at mutually different positions in the height direction and horizontal direction (horizontal direction and depth direction) of the shelf 4 , or only one opening may be provided in the shelf 4 .
In this embodiment, the laterally arranged suction tube 41-4 has openings 42-1 and 42-4 at different positions, and is laterally arranged at a height different from that of the suction tube 41-4. Openings 42-2 and 42-5 are provided at mutually different positions in the suction tube 41-5. In addition, openings 42-3 and 42-6 are provided at mutually different positions in a suction tube 41-6 which is arranged laterally at a height different from that of the suction tubes 41-4 and 41-5.

The opening 42 may be formed not only in the horizontal suction pipe 41 but also in the vertical suction pipe 41 . Further, one opening 42 may be formed in the suction tube 41, or a plurality of openings 42 may be formed. When a plurality of openings 42 are formed in the suction tube 41, they may be formed at regular intervals, or may be formed at unequal intervals. In this case, the number of openings 42 formed in the suction tube 41 may be arbitrarily determined according to the suction capacity, the sensitivity of detecting smoke, the size of the accommodation section S, or the like.
The direction of the opening of the opening 42 may be any direction, but the direction should be such that particles other than smoke contained in the air (for example, dust) are suppressed from being contained in the sucked air. is desirable. For example, the opening of the opening 42 is desirably in a direction other than upward in the height direction (positive Z-axis direction). In other words, it is desirable that the horizontal direction, the depth direction, or the downward direction in the height direction (negative direction of the Z-axis).

The switching unit 43 is provided in the suction tube 41 with the opening 42 interposed therebetween, and is opened or closed under the control of the control device 60 . By opening at least one of the switching portions 43 on both sides of the opening 42 , the air around the opening 42 can be sucked into the suction pipe 41 .

A plurality of switching portions 43 may be provided at mutually different positions in the height direction and horizontal direction of the shelf 4 , or only one switching portion 43 may be provided on the shelf 4 .
In this embodiment, in the suction pipe 41-1 that stands upright from the floor surface, the switching portions 43-1 to 43-3 are provided at different heights, and the suction pipe 41-1 is arranged in the horizontal direction. Switching portions 43-4 to 43-6 are provided at different heights in the suction pipe 41-2 erected at different positions. Switching portions 43-7 to 43-9 are provided at different heights in the suction pipe 41-3, which stands at a different position in the lateral direction than the suction pipes 41-1 and 41-2.

As shown in FIG. 9, the shelf 4 is provided with a frame (frame) made up of pillars H (pillars H-1 and H-3) and beams R in the depth direction of the suction pipe 41. As shown in FIG.
Although the frame provided in the depth direction is not used as the suction pipe here, the frame in the depth direction may be used as the suction pipe in the same manner as the frame on the front side.
As shown in FIG. 9, the shelf T is provided horizontally (horizontally and in the depth direction) on the front surface between the frame on the front side and the frame on the back side.
As shown in FIG. 10, the shelf board T is formed, for example, so that the upper surface extends along the horizontal direction (the direction of the xy plane). In addition, in the direction from the depth side to the front side (the direction from the positive side of the y-axis to the negative side of the y-axis), the shelf board T is arranged upward (positive in the z-axis) from the beam R toward the suction tube 41-4. direction). In this case, the suction pipe 41-4 is provided at the end of the shelf T on the side where the rear surface of the shelf T is inclined upward, that is, at the end of the shelf T on the z-axis positive side. Further, the opening 42-1 is formed at a portion facing the beam R in the suction tube 41-4. Similarly, an opening 42-4 is formed at a portion facing the beam R in the suction tube 41-4.
As a result, the rear side of the shelf T functions as a smoke collecting plate. That is, the smoke rising from the lower side of the shelf T is collected from the depth side to the front side and reaches the periphery of the opening 42, and the smoke is detected as compared with the case where the back side of the shelf T is not inclined. becomes easier.

FIG. 11 is a block diagram showing a configuration example of the smoke sensing main body 5 in the fourth embodiment. The smoke sensing main body 5 includes, for example, a suction portion 51 , a smoke sensing portion 52 , a communication portion 53 and a display portion 54 .
The suction unit 51 sucks the air around the section provided with the opening 42 through the suction pipe 41 and supplies the sucked air to the smoke detection unit 52 .
The smoke detector 52 detects the presence or absence of smoke (smoke density) in the air supplied by the suction unit 51 .
The communication unit 53 communicates with the control device 6 . The communication unit 53 transmits the result detected by the smoke detection unit 52 to the control device 6 .

The display unit 54 displays a signal corresponding to the detection result by the smoke detection unit 52 . The display by the display unit 54 is a display corresponding to the smoke concentration of the detected smoke. The level is displayed by lighting the LED (Light Emitting Diode).

The display unit 54 may display whether the power is on or display various errors. Various error indications are indications, for example, indicating that the suction force of the smoke sensing main body 5 has decreased, or that a foreign object has been sucked into the suction tube 41, or the like. As a result, the user operating the smoke sensing main body 5 can be notified of various errors in the smoke sensing main body 5 .

Further, the display unit 54 may display changes in smoke density in real time. This display is, for example, a display showing the smoke density by a bar graph, and a display showing an increase or decrease in the smoke density by increasing or decreasing the length of the bar graph. This makes it easier for the user to visually recognize changes in the sensed smoke density.

Note that the communication unit 53 may transmit the content displayed by the display unit 54 described above to the control device 6 .

Further, the display unit 54 may display the details of control in the smoke sensing main body 5 by the control device 6 . For example, the display unit 54 may display the switching status of the suction tube 41 and the switching unit 43 .
Specifically, the display unit 54 displays a layout diagram showing the layout of the suction tubes 41 . Then, the display unit 54 displays the suction pipe 41 serving as the smoke suction path in a color different from that of the suction pipe 41 not serving as the smoke suction route, according to the switching state of the switching unit 43 .
In addition, the display unit 54 displays a side view and a plan view showing the accommodation section. Then, the display unit 54 displays the smoke sucking section (smoke sensing region) in a different color from the smoke non-smoke sensing section (smoke sensing region) in accordance with the switching state of the switching unit 43. .
Moreover, the display unit 54 may display whether or not a smoke alarm has been issued. A smoke alarm is information transmitted (notified) to a receiver when smoke density exceeds a certain threshold. The smoke alarm is received by the receiver from, for example, a transmitter (not shown) provided in the large space 2 , and notified to the smoke sensor body 5 via the control device 6 .

Further, the display unit 54 may switch and display each display described above by a predetermined operation. In this case, for example, the smoke sensing main body 5 has an input section (not shown) including operation buttons and the like. The operation buttons of the input section are provided corresponding to each display. The display unit 54 acquires operation information indicating that the operation button has been pressed from the input unit, and switches display according to the acquired operation information.

FIG. 12 is a diagram showing a configuration example of the smoke detector 52 of the fourth embodiment.
The smoke sensing section 52 includes, for example, a light emitting element 520, a light receiving element 521, a light amount conversion section 522, an integration section 523, a determination section 524, and a scattering characteristic information storage section 525.

The light emitting element 520 is arranged so as to emit light at a predetermined irradiation angle with respect to the advancing direction of sucked air (hereinafter also simply referred to as air). The light emitting element 520 irradiates light of a predetermined wavelength to a predetermined region P in the air-flowing space. A lens may be provided between the light emitting element 520 and the region P. The lens converges the light onto a region P. This makes it possible to increase the amount of light with which the region P is irradiated, thereby increasing the amount of scattered light, which will be described later.

The light receiving element 521 is arranged at a position where it does not directly receive light from the light emitting element 520 . In this embodiment, the light receiving element 521 is arranged so as to receive light from a direction along the direction of air flow. That is, the light receiving element 551 receives the scattered light scattered at the scattering angle θ among the light emitted from the light emitting element 520 and scattered by the smoke contained in the air in the area P.

The light amount converter 522 converts the amount of light received by the light receiving element 551 into a voltage signal. The light amount conversion section 522 includes, for example, a photoelectric element that outputs a voltage signal proportional to the light amount, and outputs a signal obtained by converting the light amount into a voltage to the integration section 523 .
The integrating section 523 integrates the voltage signals corresponding to the light amount from the light amount converting section 522 by adding them in a predetermined time interval (for example, several tens of seconds). The predetermined time interval used for this integration may be arbitrarily determined according to the suction capability of the smoke sensing main body 5 and the sensitivity of detecting smoke. The integrating section 523 outputs the integrated value to the determining section 524 .

The scattering characteristic information storage unit 525 stores information in which integral values and smoke densities are associated with each other.
FIG. 13 is a diagram showing a configuration example of the scattering characteristic information storage unit 525 according to the fourth embodiment.
The scattering characteristic information storage unit 525 has, for example, items of integral value, smoke density, and detection level. The integrated value indicates an integrated value obtained by integrating the amount of light received by the light amount conversion unit 522 (the voltage value obtained by converting the amount of light into a voltage) in a predetermined time interval. The smoke density indicates the smoke density corresponding to the integrated value. The relationship between the smoke density and the integrated value is defined by, for example, previously deriving the integrated value when air having a known smoke density is sucked. The detection level indicates a level corresponding to the smoke concentration, for example, three levels of caution level, warning level, and warning level. Here, a smoke density of 1% or more and less than 3% is a caution level, and a smoke density of 3% or more and less than 7% is a warning level. A smoke density of 7% or more indicates an alarm level.

The determination unit 524 refers to the scattering characteristic information storage unit 525 based on the integrated value from the integration unit 523 . The determination unit 524 determines the smoke density corresponding to the integrated value from the integration unit 523 based on the smoke density associated with the integrated value. For example, when the integrated value from the integration unit 523 is M1 or more and less than M2, the determination unit 524 determines that the smoke density is 1% or more and less than 3%.

Alternatively, the determination unit 524 interpolates (for example, linearly interpolates) between M1 and M2 to determine the smoke density corresponding to the integrated value from the integration unit 523, which is between 1% and less than 3%. may be determined.
The determination unit 524 outputs the acquired smoke density to the communication unit 53 and the display unit 54 .

FIG. 14 is a block diagram showing a configuration example of the control device 6 in the fourth embodiment. The control device 6 includes, for example, a monitoring section information acquisition section 61, a specifying section 62, a switching valve control section 63, a sensing result acquisition section 64, a fire information communication section 65, a control section 66, and a monitoring section information storage. a portion 67;

The monitoring section information acquisition unit 61 acquires information indicating sections (monitoring sections) to be monitored on the shelf 4 . The compartments to be monitored are the storage compartments in the shelf 4, for example, any of compartments (circle A) to compartment (circle F). The monitoring section information acquisition unit 61 acquires information indicating a monitoring section by referring to monitoring sections stored in advance in the monitoring section information storage unit 67, for example. Alternatively, the monitoring section information acquisition unit 61 may acquire information indicating a monitoring section input by an input operation of a receiver, a warehouse manager, a security guard, or the like.

The identifying unit 62 identifies the switching unit 43 to be opened or closed based on the information indicating the monitored section acquired by the monitored section information acquiring unit 61 .
First, the identifying unit 62 identifies the opening 42 corresponding to the monitored section based on the information indicating the monitored section. For example, if the compartment (circle A) is a surveillance compartment, then identify opening 42-4 as the opening 42 corresponding to the surveillance compartment.
Next, the specifying unit 62 determines control of each of the switching units 43-1 to 43-9 for sucking the air around the opening 42 corresponding to the monitoring section. For example, when determining that the air around the opening 42-4 is to be sucked, the specifying unit 62 determines to close the switching units 43-1 to 43-6. Further, when the specifying unit 62 opens the switching unit 43-7, opens the switching unit 43-8 in the height direction, and opens the switching unit 43-9 in the direction from the switching unit 43-8 to the smoke sensing main body 5, judge.

When the air in the monitoring section is sucked, the longer the distance through which the sucked air flows through the suction pipe 41, the more the suction force required for the sucked air to reach the smoke sensor main body 5 from the opening 42. growing. Therefore, it is preferable that the specifying unit 62 controls the switching unit 43 so that the distance of the suction pipe 41 from the opening 42 to the smoke sensing main body 5 is the shortest.

Further, if the suction pipe 41 through which the smoke sensing main body 5 is reached from the opening 42 is provided with another opening 42 , the air is also sucked from the other opening 42 . As a countermeasure, the opening 42 may be an opening/closing portion that can be opened and closed, and the specifying portion 62 may control the opening/closing of the opening/closing portion.

Further, the smoke sensing main body 5 may be provided for each suction tube 41 in the horizontal direction or the height direction of the shelf 4 . For example, each of the suction tubes 41-4, 41-5, 41-6 may be provided with a smoke sensing body 5. In this case, the identification unit 62 does not need to perform complicated processing to minimize the distance of the suction pipe 41 from the opening 42 to the smoke sensing main body 5 . Switching control can be simplified.

In addition, when a plurality of smoke sensing main bodies 5 are provided in this way, the alarm signal and the signal indicating the smoke density, which are sensing results, may be transferred to each other.

The switching valve control section 63 controls opening or closing of the switching valve of the switching section 43 based on the determination by the specifying section 62 .
Communication of a signal for controlling the opening or closing of the switching valve between the switching valve control unit 63 and the switching unit 43 is wireless communication using a short-range wireless communication network such as infrared rays or Bluetooth (registered trademark). Alternatively, wired communication via a control line wired using the hollow portion of the suction tube 41 may be used.

The sensing result acquisition unit 64 acquires sensing results from the smoke sensing main body 5 . The sensing result acquisition unit 64 outputs the sensing result to the fire information communication unit 65 .
The fire information communication unit 65 transmits information in which the sensing result acquired by the sensing result acquiring unit 64 and the information indicating the monitoring section are associated with each other to the receiver. Also, the fire information communication section 65 may transmit information indicating the content displayed on the display section 54 of the smoke sensing main body 5 to the receiver.

The control unit 66 controls the control device 6 in an integrated manner. The control unit 66 causes the identifying unit 62 to output information indicating the monitored section acquired by the monitored section information acquiring unit 61, for example. The control unit 66 causes the switching valve control unit 63 to output information indicating the control of the switching unit 43 specified by the specifying unit 62 .

The monitoring section information storage unit 67 stores information regarding monitoring sections. The information about the monitored section may include information indicating the section to be monitored, information indicating the order of monitoring for a plurality of monitored sections, and the like.

FIG. 15 is a sequence chart showing an operation example of the fire detection system 1E in the fourth embodiment.
First, the control device 6 acquires the monitoring section information indicating the monitoring section by the monitoring section information acquisition section 61 (step S1).
Next, the control device 6 uses the identifying unit 62 to identify a monitored section based on the monitored section information (step S2). The identification unit 62 identifies the opening 42 of the section from which air is sucked based on the monitoring section information, and determines control of the switching unit 43 for supplying the air sucked from the identified opening 42 to the smoke sensing main body 5. do.
Next, the control device 6 causes the switching valve control section 63 to control the switching section 43 based on the determination of whether the switching valve is opened or closed by the specifying section 62 (step S3).
Then, the control device 6 transmits an instruction to detect smoke to the smoke sensing main body 5 (step S4).

When the smoke detection main body 5 receives the command to detect smoke from the control device 6, the smoke detection main body 5 performs suction by the suction portion 51 (step S5).
Next, the smoke sensing main body 5 receives scattered light when light is irradiated onto the sucked air by the light receiving element 521 of the smoke sensing section 52 (step S6).
Next, the smoke sensing main body 5 integrates the amount of light received by the integrating section 523 in a predetermined time interval (step S7).
Next, the smoke sensing main unit 5 determines the smoke density from the integrated value by the determination unit 524 (step S8).
Then, the smoke sensing main body 5 transmits the determined smoke density to the control device 6 (step S9).

The control device 6 receives the smoke density from the smoke sensing main body 5 (step S10), and transmits information that associates the received smoke density with the monitoring section to the receiver (step S11). In step S11, the control device 6 may transmit information indicating the content displayed on the display section 54 of the smoke sensing main body 5 to the receiver.
After executing the process shown in step S11, the control device 6 returns to step S2 and continues the process of monitoring the section to be monitored.
Alternatively, after executing step S11, the control device 6 may return to step S2 after performing the process of determining whether or not it is necessary to change the section to be monitored. When changing the section to be monitored, the control device 6 specifies the changed monitoring area in step S2. If the section to be monitored is not changed, the control device 6 may return to step S4.
The controller 6 determines, for example, depending on the smoke density received from the smoke sensing body 5 whether the zone to be monitored needs to be changed. For example, the control device 6 determines not to change the section to be monitored when the smoke density indicates a density at which smoke generation is suspected. As a result, it is possible to quickly detect the subsequent trend, that is, whether the smoke grows or disappears and becomes undetectable.

As described above, the fire detection system 1E in the fourth embodiment is a hollow frame that forms a housing section of a shelf provided in the large space 2, and includes a suction pipe 41 through which sucked air flows. , an opening 42 provided in the suction pipe 41, and a smoke sensing body 5 for detecting the presence or absence of smoke contained in the sucked air. As a result, the fire detection system 1E in the fourth embodiment has the same effects as those described above, and also uses the frame of the rack as a suction pipe, thereby requiring labor and cost for piping the suction pipe to the shelf. It is possible to detect smoke without narrowing the space of the accommodation compartment by providing a separate suction tube.

Further, in the fire detection system 1E in the fourth embodiment, the smoke sensing main body 5 includes a suction portion 51 that sucks air around the opening 42 through the suction tube 41, and the air sucked by the suction portion 51. a light-emitting element 520 that emits light; a light-receiving element 521 that receives scattered light scattered by particles contained in the air in which the light emitted by the light-emitting element 520 is sucked by the suction portion 51; An integrator 523 that integrates the amount of scattered light received for a predetermined time, and a determination unit 524 that determines the particle concentration of particles contained in the sucked gas based on the integrated value from the integrator 523 . As a result, in the fire detection system 1E of the fourth embodiment, the smoke concentration can be determined using the integrated value, and the presence or absence of smoke contained in the air sucked from the opening 42 in a predetermined time interval can be determined. Based on this, it is possible to detect the occurrence of a fire.

Further, in the fire detection system 1E according to the fourth embodiment, the smoke detection unit 52 further includes a lens for condensing the light emitted by the light emitting element 520 onto a specific area of the air sucked by the suction unit 51. Prepare. As a result, it is possible to increase the amount of light irradiated to a specific area, thereby increasing the amount of scattered light described later, and by increasing the amount of received light, smoke can be detected more accurately.
In addition, in the fire detection system 1E in the fourth embodiment, a plurality of suction pipes 41 are provided. It further includes a monitoring section information acquisition section 61 that acquires monitoring section information, and a switching valve control section 63 that controls the switching valve based on the monitoring section information. As a result, in the fire detection system 1E of the fourth embodiment, it becomes possible to control the opening or closing of the switching valve of the switching section 43 according to the monitoring section, and the distance from the opening 42 to the smoke sensing main body 5 can be controlled. By minimizing the distance of the suction tube 41, the air in the desired monitoring section can be sucked with the minimum suction force.

(Modified example of the fourth embodiment)
In the above-described fourth embodiment, an example has been described in which the information is transmitted to the receiver each time the control device 6 receives the smoke concentration. However, it is not limited to this. The control device 6 may transmit information to the receiver when the smoke density received from the smoke sensing main body 5 is equal to or greater than a predetermined threshold.
In this case, for example, the sensing result acquisition unit 64 of the control device 6 outputs the sensing result of the smoke sensing main body 5 to the control unit 66 . The control unit 66 compares the smoke concentration included in the sensing result with a predetermined threshold. The control unit 66 outputs the detection result to the fire information communication unit 65 when the smoke concentration is equal to or higher than a predetermined threshold according to the comparison result. The fire information communication unit 65 transmits to the receiver information in which the sensing result acquired from the control unit 66 and the information indicating the monitored section are associated with each other.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design and the like are included within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 1... Fire detection system, 2... Large space, 3... Shelf, 10... Smoke sensor, 20... Smoke collecting plate, 30... Smoke sensor with smoke collecting plate, 4... Shelf, 41... Suction pipe, 42... Opening , 43... Switching unit, 5... Smoke sensing main unit, 52... Smoke sensing unit, 520... Light emitting element, 521... Light receiving element, 523... Integrating unit, 524... Judging unit, 6... Control device, 61... Monitoring section information Acquisition unit 62...Specification unit 63...Switching valve control unit

Claims (5)

A fire detection system for monitoring a large space ,
The large space is a space having a height such that a plurality of air layers with mutually different temperatures can be formed between the floor surface and the ceiling,
A suction type smoke sensor is provided at any position in the height direction in a second layer below the first layer including the vicinity of the ceiling of the large space among the plurality of air layers,
The suction type smoke detector is
A plurality of suction pipes for sucking air from regions different from each other in the height direction in the second layer are provided, and by switching the air sucked by the plurality of suction pipes, smoke in each of the regions different from each other in the height direction to detect
When smoke contained in the air sucked by a first suction tube among the plurality of suction tubes is detected, the number of suction tubes including the first suction tube and less than the total number of the plurality of suction tubes is detected. By switching to sucked air, smoke is detected in a narrower area than the entire area to be monitored, including the area sucked by the first suction pipe.
Fire detection system. The fire detection system according to claim 1, wherein a plurality of the suction type smoke sensors are provided at different positions in the height direction. The suction type smoke detector is
A suction pipe including a plurality of openings for sucking air in different regions, and detecting smoke in each of the different regions by monitoring the air sucked through each of the plurality of openings. 3. A fire detection system according to claim 1 or claim 2 . 4. The fire detection system according to any one of claims 1 to 3 , wherein the suction type smoke detectors are installed so that detection targets are different from each other on a plane. The suction-type smoke detectors are installed so that detection targets are regions along different directions on a plane, and that at least a part of the detection target regions overlap,
The fire detection system according to any one of claims 1 to 4 , further comprising a management device that specifies locations where smoke is detected on the plane based on detection results of each of the smoke sensors.

Images