Fire indication detection system

Abstract

The present disclosure addresses the problem of providing a fire indication detection system that is capable of detecting, quickly and with high sensitivity, an indication of a fire in a space in which power distribution equipment and an electric device are disposed. A fire indication detection system according to the present invention comprises a sensor (2). The sensor (2) is provided in a second space (51). The second space (51) is a part of a first space (10) that is the subject of fire indication detection. In the second space (51), power distribution equipment (6) and an electric device (7) connected to the power distribution equipment (6) are disposed. The sensor (2) is provided in such a manner as to protrude downwards from an upper end surface (52) of a fixture (5) that constitutes at least part of the outer edges of the second space (51).

Description

Fire Prediction and Detection System

[0001] The present disclosure relates to a fire sign detection system, and more particularly to a fire sign detection system that detects signs of a fire in a space where power distribution equipment and electrical equipment are located.

[0002] Patent Document 1 describes a suction-type smoke detector for detecting fires in warehouses. The suction-type smoke detector in Patent Document 1 has a suction pipe that is provided so as to be able to rise and fall together with a stacker crane that transfers cargo between storage compartments, and moves in accordance with the sliding motion of the slide fork of the stacker crane.

[0003] However, with the suction-type smoke detector of Patent Document 1, it may be difficult to detect signs of a fire depending on the relative positions of the stacker crane and the location of the fire in the warehouse.

[0004] Japanese Patent Application Laid-Open No. 2020-86764

[0005] The present disclosure aims to provide a fire sign detection system that can quickly and sensitively detect signs of a fire in a space where power distribution facilities and electrical equipment are located.

[0006] A fire warning detection system according to one aspect of the present disclosure includes a sensor. The sensor is installed in a second space. The second space is part of a first space that is the target of fire warning detection, and includes a power distribution facility and electrical equipment. The electrical equipment is connected to the power distribution facility. The sensor is installed so as to protrude downward from an upper end surface of a fixture. The fixture constitutes at least a portion of the outer edge of the second space.

[0007] FIG. 1 is a block diagram of a fire warning detection system according to an embodiment. FIG. 2 is a schematic diagram of a monitored space in which the fire warning detection system is installed. FIG. 3 is a graph showing changes in gas and smoke concentration when urea resin is overheated in a space. FIG. 4 is a graph showing changes in gas and smoke concentration when urea resin is overheated in a space different from that of FIG. 3. FIG. 5 is a graph showing changes in gas and smoke concentration when polyvinyl chloride resin is overheated in the same space as FIG. 3. FIG. 6 is a graph showing changes in gas and smoke concentration when acrylic fiber is overheated in the same space as FIG. 3. FIG. 7 is a graph showing changes in gas and smoke concentration when ABS resin is overheated in the same space as FIG. 3.

[0008] Hereinafter, a fire warning detection system according to an embodiment will be described in detail with reference to the drawings. However, each diagram described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiment is merely an example of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0009] (Embodiment) (1) Overview The fire sign detection system 1 is a system that detects fire signs and fires in a monitored space 10. Here, a fire sign refers to a state that has not yet reached a state that can be called a fire, but has a high possibility of developing into a fire, such as an overheating phenomenon due to tracking.

[0010] The monitored space 10 is a space partitioned as a single section in, for example, an office, a store, a factory, a warehouse, a building, a school, a welfare facility, a hospital, etc. Here, the monitored space 10 includes a power distribution facility 6 and electrical equipment 7.

[0011] The electrical equipment 7 includes not only power-consuming equipment such as a server, a router, a network hub, and a lighting fixture, but also wiring devices with contacts such as a distribution board, a breaker, an outlet, and a power strip. That is, the electrical equipment 7 has a contact terminal. Here, the contact terminal of the electrical equipment 7 may be a terminal for connecting to the power distribution facility 6 or may be a terminal for connecting to another electrical equipment or a wiring device.

[0012] The power distribution facility 6 is a facility that supplies power to the electrical equipment 7, and is, for example, a wiring for power. That is, the electrical equipment 7 is connected to the power distribution facility 6. Note that, if the electrical equipment 7 is an equipment that has a plug, such as a server or a router, the power distribution facility 6 may have a jack that can be connected to the plug.

[0013] As shown in Fig. 2, a plurality of pieces of furniture 5 (five pieces in Fig. 2) are arranged in the monitored space 10. Each piece of furniture 5 is, for example, a server rack, a system rack, a nesting rack, etc. Furthermore, each piece of furniture 5 is, for example, a housing for a distribution board, an exterior of a lighting fixture, an outlet box, etc. Fig. 2 shows the furniture 5 as a server rack 5a, a housing for a distribution board 5b, an exterior of two lighting fixtures 5c, and an outlet box 5d.

[0014] The interior space 51 of the fixture 5 is part of the monitored space 10. The interior space 51 of the fixture 5 corresponds to the second space of the present disclosure. Here, if the fixture 5 is an airtight container, the interior space 51 of the fixture 5 refers to the entire interior of the airtight container that is the fixture 5. Furthermore, if the fixture 5 has an opening such as a ventilation hole, or if the fixture 5 has an open structure such as a nesting rack, the interior space 51 of the fixture 5 is, for example, the space inside the smallest rectangular parallelepiped that contains the entire fixture 5. In other words, the fixture 5 constitutes at least a part of the outer edge of the interior space 51 of the fixture 5. Preferably, the outer edge of the interior space 51 of the fixture 5 is composed of a plurality of planes, and each plane includes a part of the fixture 5. For example, if the fixture 5 is a system rack with ventilation holes in the wall, the internal space 51 of the fixture 5 is the sealed space inside the fixture 5 if it is assumed that the fixture 5 does not have ventilation holes. Also, for example, if the fixture 5 is a nesting rack, the internal space 51 of the fixture 5 is the inside of a rectangular parallelepiped of the smallest size that can fit the nesting rack.

[0015] The volume of the interior space 51 of the fixture 5 is 10 m ３ It is preferable that:

[0016] Furthermore, power distribution equipment 6 and electrical equipment 7 are disposed in each of the plurality of fixtures 5. More specifically, electrical equipment 7 is disposed in the internal space of each of the plurality of fixtures 5. Furthermore, power distribution equipment 6 connected to electrical equipment 7 is disposed in the internal space of each of the plurality of fixtures 5.

[0017] (2) Configuration (2.1) Overall Configuration As shown in Fig. 1, the fire warning detection system 1 includes a plurality of (two in Fig. 1) furniture sensors 2, a plurality of (two in Fig. 1) area sensors 3, and a management server 4. Each of the plurality of furniture sensors 2 corresponds to a sensor in the present disclosure.

[0018] The fire sign detection system 1 detects signs of a fire in a monitored space 10. The monitored space 10 corresponds to the first space of the present disclosure. The monitored space 10 is, for example, a section of an office, a warehouse, or a factory.

[0019] (2.2) Furniture Sensors A plurality of furniture sensors 2 are installed on a plurality of furniture 5 (see FIG. 2 ). More specifically, the furniture sensors 2 are installed so as to protrude downward from the upper end surface 52 of the furniture 5. Here, the upper end surface 52 of the furniture 5 refers to a portion above the furniture 5 that constitutes at least a part of the surface that forms the boundary between the interior space of the furniture 5 and the outside of the interior space. For example, if the furniture 5 is a server rack, a distribution board housing, an exterior of a lighting fixture, an outlet box, or the like, the upper end surface 52 of the furniture 5 is the top surface. Furthermore, for example, if the furniture 5 is a system rack, a nesting rack, or the like, the upper end surface 52 of the furniture 5 is the uppermost shelf.

[0020] Each of the plurality of fixture sensors 2 includes, for example, a detection unit 21, a power unit 22, and a communication unit 23.

[0021] The detection unit 21 detects a fire or a sign of a fire in the internal space of the fixture 5. Here, a sign of a fire refers to a state such as an overheating phenomenon that has not yet reached the stage of a fire but has a high possibility of becoming a fire. The detection unit 21 is, for example, a gas sensor that detects low-molecular-weight gases that are generated by overheating or combustion of combustible materials. Low-molecular-weight gases that are generated by overheating or combustion of combustible materials include, for example, formaldehyde (HCHO), carbon monoxide (CO), ammonia (NH ３ ), and hydrogen chloride (HCl). The detection unit 21 may be a particulate sensor. The particulate sensor is, for example, an optical smoke sensor, an optical PM (Particle Matter) 2.5 sensor, or the like.

[0022] The power unit 22 supplies power to the detection unit 21 and the communication unit 23. The power unit 22 is, for example, a battery. The power unit 22 also converts AC power received from, for example, a power line into DC power and supplies the DC power to the detection unit 21 and the communication unit 23. The power unit 22 is connected to, for example, the power distribution facility 6.

[0023] The communication unit 23 transmits the detection result of the detection unit 21 to the management server 4 via the network NT1. For example, when the detection unit 21 detects a fire warning sign, the communication unit 23 transmits a signal indicating the fire warning sign. Furthermore, for example, when the detection unit 21 detects a fire, the communication unit 23 transmits a signal indicating the fire. The communication unit 23 has an interface for connecting to the network NT1, and has, for example, a wireless interface compatible with Bluetooth (registered trademark), Bluetooth LE, etc. Furthermore, the communication unit 23 may have, for example, a wired interface compatible with Ethernet (registered trademark), etc.

[0024] Furthermore, the plurality of fixture sensors 2 may further include, for example, an alarm unit. For example, when the detection unit 21 detects a fire warning, the alarm unit issues an alarm using sound, light, or both sound and light. Here, the alarm unit may change the manner of light or sound depending on whether a fire is detected or a fire warning is detected.

[0025] Furthermore, when the fixture 5 has multiple internal spaces that are sealed from each other, the fixture sensor 2 may be provided in each of the multiple internal spaces. For example, in the server rack 5a shown in Fig. 2, the fixture sensor 2 is also provided on the shelf boards other than the lowest one. The lower surface 53 of the shelf board other than the lowest one corresponds to the middle surface in this disclosure.

[0026] (2.3) Area Sensors Furthermore, a plurality of area sensors 3 are installed in the monitored space 10. The area sensors 3 are arranged, for example, on the ceiling of the monitored space 10. The area sensors 3 detect fires in the monitored space 10. More specifically, the area sensors 3 detect heat or smoke caused by a fire in the monitored space 10.

[0027] Each of the plurality of area sensors 3 includes, for example, a detection unit 31 , a power unit 32 , and a communication unit 33 .

[0028] The detection unit 31 is, for example, an optical smoke sensor. The detection unit 31 is, for example, a heat sensor. The detection unit 31 may also be, for example, a gas sensor.

[0029] The power unit 32 supplies power to the detection unit 31 and the communication unit 33. The power unit 32 is, for example, a battery. Alternatively, the power unit 32 may convert AC power received from a power line or the like into DC power and supply the DC power to the detection unit 31 and the communication unit 33.

[0030] The communication unit 33 transmits the detection result of the detection unit 31 to the management server 4 via the network NT1. For example, when the detection unit 31 detects a fire, the communication unit 33 transmits a signal indicating the fire detection. The communication unit 33 has an interface for connecting to the network NT1, and has, for example, a wireless interface compatible with Bluetooth, Bluetooth LE, etc. The communication unit 33 may also have a wired interface compatible with, for example, Ethernet, etc.

[0031] Furthermore, the area sensors 3 may further include, for example, a notification unit. When the detection unit 31 detects a fire, the notification unit issues a notification using sound, light, or both sound and light.

[0032] (2.4) Management Server The management server 4 receives information from each of the plurality of fixture sensors 2 and each of the plurality of area sensors 3, and detects signs of fire and fires in the monitored space 10. When the management server 4 receives a signal based on detection from any one of the plurality of area sensors 3, it notifies that a sign of fire has been detected in the monitored space 10, or that a fire has occurred.

[0033] The management server 4 includes, for example, a determination unit 41 , a communication unit 42 , and a notification unit 43 .

[0034] The determination unit 41 determines whether or not there are signs of a fire or a fire has occurred in the monitored space 10, based on the detection results from the multiple furniture sensors 2 and the notification results from the multiple area sensors 3. For example, when the determination unit 41 is notified of the detection of a fire sign from any one of the multiple furniture sensors 2, the determination unit 41 determines that a sign of a fire has been detected in the furniture 5 on which the furniture sensor 2 is installed. Furthermore, for example, when the determination unit 41 is notified of the detection of a fire from any one of the multiple furniture sensors 2, the determination unit 41 determines that a fire has occurred in the furniture 5 on which the furniture sensor 2 is installed. Furthermore, for example, when the determination unit 41 is notified of the detection of a fire from any one of the multiple area sensors 3, the determination unit 41 determines that a fire has occurred in the monitored space 10.

[0035] The communication unit 42 receives signals indicating the detection of a fire warning sign or a fire from the plurality of fixture sensors 2 and the plurality of area sensors 3 via the network NT1. The communication unit 42 has an interface for connecting to the network NT1, and may have a wireless interface compatible with Bluetooth, Bluetooth LE, etc. Alternatively, the communication unit 42 may have a wired interface compatible with Ethernet, etc.

[0036] When the determination unit 41 determines that a fire warning sign or a fire has occurred in the monitored space 10, the alarm unit 43 issues an alarm using sound, light, or both sound and light. The alarm unit 43 changes the mode of the alarm depending on, for example, whether a fire warning sign has occurred in the monitored space 10 or a fire has occurred in the monitored space 10. The alarm unit 43 may include, for example, a display unit that indicates the arrangement of fixtures 5 in the monitored space 10 and which fixture 5 has generated a fire warning sign. The alarm unit 43 may also cause an information terminal or the like to issue an alarm via the communication unit 42 indicating that a fire warning sign or a fire has occurred in the monitored space 10.

[0037] The management server 4 includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The functions of the management server 4 in the present disclosure are realized by the processor executing a program recorded in the computer system's memory. The program may be pre-recorded in the computer system's memory, provided via a telecommunications line, or provided on a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmed after the LSI is manufactured, or logic devices that allow the reconfiguration of internal connections or internal circuit partitions of the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0038] Furthermore, it is not essential for the management server 4 that multiple functions of the management server 4 are concentrated in one housing, and the components of the management server 4 may be distributed across multiple housings. Furthermore, at least some of the functions of the management server 4, for example, some of the functions of the determination unit 41, may be realized by the cloud (cloud computing) or the like.

[0039] Conversely, at least some of the functions of the management server 4, which are distributed among multiple components in the embodiment, may be integrated into a single housing.

[0040] (3) Relationship between the size of the interior space of the fixture 5 and detection accuracy Figure 3 shows the relationship between the size of the interior space of the fixture 5 and detection accuracy. ３ 4 is a graph showing the time series changes in formaldehyde concentration 611, ammonia concentration 612, carbon monoxide concentration 613, and smoke concentration 615 at the ceiling of the space when urea resin is heated in a space with a volume of 280 m. ３ 3 and 4 are graphs showing time series changes in formaldehyde concentration 621, ammonia concentration 622, carbon monoxide concentration 623, and smoke concentration 625 at the ceiling of a space when urea resin is heated in the space. In both of FIGS. 3 and 4 , the temperature of the urea resin is room temperature at time t0, and heating is performed so that the temperature rises by 10 K per minute, and heating is terminated when the temperature of the urea resin reaches 400°C. In addition, in FIGS. 3 and 4 , the vertical axis of gas concentration is logarithmic, while the vertical axis of smoke concentration is linear. The horizontal axis in FIG. 3 is the time axis, and the time between time t0 and time t11, the time between time t11 and time t12, and the time between time t12 and time t13 are each, for example, between 200 and 1000 seconds, e.g., 1000 seconds. Similarly, the horizontal axis in Figure 4 is the time axis, and the time between time t0 and time t21, the time between time t21 and time t22, the time between time t22 and time t23, and the time between time t23 and time t24 are each, for example, between 200 seconds and 1000 seconds, e.g., 1000 seconds.

[0041] As shown in Figure 3, when urea resin is heated, formaldehyde is generated by thermal decomposition as the temperature of the resin rises, and as the temperature rises further, ammonia and smoke are generated. Furthermore, as the temperature of the urea resin rises further, carbon monoxide is generated. ３ When the urea resin is heated in the space, as shown in FIG. 3, the concentrations of formaldehyde, ammonia, smoke, and carbon monoxide increase as the temperature of the urea resin increases.

[0042] On the other hand, as shown in Figure 4, ３ When urea resin is heated in a space with a volume of 280 m, it is difficult to detect smoke. ３ In a space with a volume of 1m ３ Compared to the space (10), when the temperature of the urea resin is the same, the concentrations of formaldehyde, ammonia, and carbon monoxide are each reduced to about one-tenth. The reason for this is that formaldehyde, ammonia, and carbon monoxide are all low-molecular-weight gases that tend to diffuse in the air, making them difficult to detect in large spaces. In other words, when the monitored space 10 is large, providing the interior spaces 51 of the fixtures 5 in the monitored space 10 and performing fire prediction for each interior space 51 of the fixtures 5 makes it easier to detect fire predictions.

[0043] Therefore, by not only installing the area sensor 3 on the ceiling of the monitored space 10, but also installing the fixture sensor 2 below the upper end surface of the fixture 5, it is possible to improve the accuracy of detecting signs of fire in the internal space of the fixture 5.

[0044] (4) Relationship between Combustible Materials and Fire Sign Detection As described above, by providing the fixture sensor 2 that detects formaldehyde, ammonia, carbon monoxide, or smoke below the upper end surface of the fixture 5, it becomes possible to detect fire signs caused by overheating of urea resin. This makes it possible to detect, for example, overheating of a urea resin-based electrical outlet as a fire sign.

[0045] Figure 5 shows the structure of a 1 m ３ 5 is a graph showing time series changes in formaldehyde concentration 631, ammonia concentration 632, carbon monoxide concentration 633, hydrogen chloride concentration 634, and smoke density 635 at the ceiling of the space when the space is heated. Note that, unlike FIGS. 3 and 4 , in FIG. 5 , the vertical axis of gas concentration and the vertical axis of smoke density are both linear axes. Also, the horizontal axis in FIG. 5 is the time axis, and the time between time t0 and time t31, the time between time t31 and time t32, and the time between time t32 and time t33 are each, for example, between 200 seconds and 1000 seconds, e.g., 1000 seconds.

[0046] Polyvinyl chloride, which is used to cover indoor wiring, produces smoke, carbon monoxide, and hydrogen chloride when overheated. Therefore, by installing a fixture sensor 2 that detects carbon monoxide, hydrogen chloride, or smoke below the top surface of the fixture 5, it is possible to detect signs of a fire caused by overheated polyvinyl chloride. This makes it possible to detect, for example, overheating of indoor wiring that uses polyvinyl chloride as a covering as a sign of a fire. Note that while Figure 5 shows a decrease in ammonia concentration due to an increase in the temperature of the polyvinyl chloride, this is because the gas sensor that detects ammonia detects an increase in the hydrogen chloride concentration as a decrease in ammonia concentration, and the data does not indicate a change in ammonia concentration.

[0047] Figure 6 shows the acrylic fiber in a volume of 1 m ３ 6 is a graph showing time series changes in formaldehyde concentration 641, ammonia concentration 642, carbon monoxide concentration 643, hydrogen chloride concentration 644, and smoke density 645 at the ceiling of the space when the space is heated. As in FIGS. 3 and 4 , the vertical axis of gas concentration in FIG. 6 is a logarithmic axis, and the vertical axis of smoke density is a linear axis. The horizontal axis in FIG. 6 is a time axis, and the time between time t0 and time t41, the time between time t41 and time t42, the time between time t42 and time t43, and the time between time t43 and time t44 are each, for example, between 200 seconds and 1000 seconds, e.g., 1000 seconds.

[0048] When ABS resin, which is used in curtains, carpets, etc., overheats, it produces smoke, carbon monoxide, ammonia, and formaldehyde. Therefore, by installing a fixture sensor 2 that detects formaldehyde, ammonia, carbon monoxide, or smoke below the upper end surface of the fixture 5, it becomes possible to detect signs of a fire caused by overheating of acrylic fibers. This makes it possible to detect overheating of curtains, carpets, etc. made of acrylic fibers as a sign of a fire.

[0049] Figure 7 shows the results of a 1 m3 ABS (Acrylonitrile Butadiene Styrene) resin ３7 is a graph showing time series changes in formaldehyde concentration 651, ammonia concentration 652, carbon monoxide concentration 653, and smoke concentration 655 at the ceiling of the space when the space is heated. As in FIGS. 3 and 4 , the vertical axis of gas concentration in FIG. 7 is a logarithmic axis, and the vertical axis of smoke concentration is a linear axis. The horizontal axis in FIG. 7 is a time axis, and the time between time t0 and time t51, the time between time t51 and time t52, and the time between time t52 and time t53 are each, for example, between 200 seconds and 1000 seconds, e.g., 1000 seconds.

[0050] When ABS resin, which is used for housings of electrical equipment, etc., overheats, it produces smoke, carbon monoxide, ammonia, and formaldehyde. Therefore, by installing a fixture sensor 2 that detects formaldehyde, ammonia, carbon monoxide, or smoke below the top surface of the fixture 5, it becomes possible to detect signs of a fire caused by overheating of ABS resin. This makes it possible to detect overheating of electrical equipment that uses ABS resin for its housing as a sign of a fire.

[0051] As described above, when resin overheats, the types and concentration ratios of low-molecular-weight gases that are generated vary depending on the type of resin. Therefore, for example, if different types of electrical equipment 7 are installed in each fixture 5, by using a fixture sensor 2 having a detection unit 21 that can detect low-molecular-weight gases that correspond to the type of resin used in the electrical equipment 7, it is possible to quickly detect signs of an electrical fire occurring in the electrical equipment 7 of the fixture 5.

[0052] Furthermore, for example, if the detection unit 21 of the fixture sensor 2 has a sensor that detects the concentration of each type of gas, it will not only be possible to detect if any resin in the interior space of the fixture 5 has become overheated, but also to identify which resin has become overheated. For example, the detection unit 21 of the fixture sensor 2 may detect signs of a fire based on the carbon monoxide concentration, and further predict the substance that has become overheated using one or more of the ammonia concentration, formaldehyde concentration, and hydrogen chloride concentration.

[0053] In the above example, the case where the material that has become overheated is resin is described, but even if a glass epoxy board or a paper phenolic board becomes overheated, it is possible to detect signs of fire using formaldehyde and carbon monoxide.

[0054] (5) Effects The fire warning detection system 1 according to the embodiment includes a furniture sensor 2. The furniture sensor 2 is installed in the interior space 51 of the furniture 5. The interior space 51 of the furniture 5 is part of the monitored space 10, which is the target of fire warning detection, and includes a power distribution facility 6 and electrical equipment 7. The electrical equipment 7 is connected to the power distribution facility 6. The furniture sensor 2 is installed so as to protrude downward from the upper end surface 52 of the furniture 5. The furniture 5 constitutes at least a part of the outer edge of the interior space 51 of the furniture 5. This enables the fire warning detection system 1 according to the embodiment to quickly detect a fire warning when it occurs in the interior space 51 of the furniture 5. Therefore, the fire warning detection system 1 according to the embodiment can improve the accuracy of detecting fire warnings for the entire monitored space 10.

[0055] In the fire warning detection system 1 according to the embodiment, the fixture sensor 2 is a gas sensor. As a result, the fire warning detection system 1 according to the embodiment can improve the accuracy of detecting fire warnings by detecting gas generated by fire warnings.

[0056] Furthermore, in the fire warning detection system 1 according to the embodiment, the fixture sensor 2 detects at least one of formaldehyde, carbon monoxide, ammonia, and hydrogen chloride. This allows the fire warning detection system 1 according to the embodiment to improve the accuracy of detecting fire warning signs when the power distribution equipment 6 and the electrical equipment 7 contain resin or the like.

[0057] Furthermore, in the fire warning detection system 1 according to the embodiment, the fixture sensor 2 may be a particulate sensor. This allows the fire warning detection system 1 according to the embodiment to improve the accuracy of detecting fire warnings by detecting smoke caused by fire warnings.

[0058] Furthermore, in the fire warning detection system 1 according to the embodiment, the electrical device 7 has a contact terminal, which allows the fire warning detection system 1 according to the embodiment to quickly detect a fire warning caused by tracking or the like at the contact terminal of the electrical device 7.

[0059] Furthermore, in the fire warning detection system 1 according to the embodiment, the power distribution equipment 6 may supply power to the fixture sensors 2. This allows the fire warning detection system 1 according to the embodiment to supply power to the fixture sensors 2 and the electrical devices 7 in each of the interior spaces 51 of the fixtures 5 from a single power distribution equipment 6, making power wiring easier.

[0060] The fire warning detection system according to the embodiment also includes a plurality of furniture sensors 2. The server rack 5a has an intermediate surface 53 that is different from the top surface 52. The plurality of furniture sensors 2 are disposed on the top surface 52 of the server rack 5a and the intermediate surface 53 of the server rack 5a. This makes it easy for the fire warning detection system 1 according to the embodiment to detect warning signs of an electrical fire in any of the electrical devices 7 installed in the server rack 5a.

[0061] The fire warning system according to the embodiment also includes an area sensor 3. The area sensor 3 is provided in the monitored space 10. The area sensor 3 detects at least one of heat and smoke caused by a fire in the monitored space 10. This makes it possible for the fire warning detection system according to the embodiment to detect the presence or absence of a fire throughout the monitored space 10.

[0062] (Modifications) (1) In the fire warning detection system 1 according to the embodiment, the multiple area sensors 3 are provided outside the fixtures 5, but one or more area sensors 3 may be provided in the interior space 51 of the fixtures 5. This configuration also enables the area sensors 3 to detect a fire in the monitored space 10.

[0063] (2) In the fire warning detection system 1 according to the embodiment, the power unit 22 of the furniture sensor 2 is connected to the power distribution equipment 6, but the power unit 22 may receive power from a power distribution equipment other than the power distribution equipment 6. This allows the furniture sensor 2 to detect a fire warning or a fire, for example, if the power distribution equipment 6 burns down.

[0064] The power unit 22 may also be a battery. More specifically, the power unit 22 is a primary battery such as a lithium battery. Alternatively, the power unit 22 may include a power conversion circuit that converts AC power received from a power line or the like into DC, and a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery. The power conversion circuit supplies power to the detection unit 21 and the communication unit 23 and charges the secondary battery. The secondary battery supplies power to the detection unit 21 and the communication unit 23 when the power conversion circuit cannot receive AC power.

[0065] (3) In the fire warning detection system 1 according to the embodiment, a rack is given as an example of the fixture 5. However, the rack may be deformable, such as by being foldable. In this case, the fixture sensor 2 provided on the fixture 5 may be activated even when the fixture 5, which is a rack, is folded.

[0066] (Aspect) A fire warning detection system (1) according to a first aspect includes a sensor (2). The sensor (2) is arranged in a second space (51). The second space (51) is part of a first space (10) that is the target of fire warning detection, and has a power distribution facility (6) and an electrical device (7) arranged therein. The electrical device (7) is connected to the power distribution facility (6). The sensor (2) is arranged so as to protrude downward from an upper end surface (52) of a fixture (5). The fixture (5) constitutes at least a part of the outer edge of the second space (51).

[0067] The fire warning detection system (1) according to the above aspect can quickly detect a fire warning when it occurs in the second space (51). Therefore, the fire warning detection system (1) according to the above aspect can improve the accuracy of detecting fire warnings for the entire first space (10).

[0068] In the fire warning detection system (1) according to the second aspect, the sensor (2) is a gas sensor in the first aspect.

[0069] According to the fire sign detection system (1) of the above aspect, it is possible to improve the accuracy of detecting fire signs by detecting gas generated by fire signs.

[0070] In the fire warning detection system (1) according to the third aspect, in the second aspect, the sensor (2) detects at least one of formaldehyde, carbon monoxide, ammonia, and hydrogen chloride.

[0071] According to the fire warning detection system (1) of the above aspect, it is possible to improve the accuracy of detecting fire warning signs when the power distribution equipment (6) and the electrical equipment (7) contain resin or the like.

[0072] In the fire warning detection system (1) according to the fourth aspect, in the first aspect, the sensor (2) is a particulate sensor.

[0073] According to the fire sign detection system (1) of the above aspect, it is possible to improve the accuracy of detecting fire signs by detecting smoke generated by fire signs.

[0074] In the fire warning detection system (1) according to a fifth aspect, in any one of the first to fourth aspects, the electrical device (7) has a contact terminal.

[0075] According to the fire warning detection system (1) of the above aspect, it is possible to quickly detect a fire warning caused by tracking or the like at the contact terminal of the electrical device (7).

[0076] The fire warning detection system (1) according to the sixth aspect is different from the first power distribution facility (6) in any of the first to fifth aspects and further includes a second power distribution facility that supplies power to the sensor (2).

[0077] According to the fire warning detection system (1) relating to the above aspect, it is possible to detect a fire warning or a fire in the second space (51), for example, even if the power distribution equipment (6) is damaged by a fire or a fire warning.

[0078] In the fire warning detection system (1) according to the seventh aspect, in any one of the first to fifth aspects, the power distribution equipment (6) supplies power to the sensor (2).

[0079] According to the fire warning detection system (1) of the above aspect, the fixture sensor (2) and the electrical equipment (7) can be powered from a single power distribution facility (6), which simplifies power wiring.

[0080] A fire warning detection system (1) according to an eighth aspect is any one of the first to seventh aspects, and includes a plurality of sensors (2). The fixture (5) has an intermediate surface (53) different from the upper end surface (52). The plurality of sensors (2) are arranged on the upper end surface (52) of the fixture (5) and on the intermediate surface (53) of the fixture (5).

[0081] According to the fire warning detection system (1) of the above aspect, it becomes easy to detect warning signs of an electrical fire for any electrical equipment (7) installed in the second space (51).

[0082] A fire warning detection system (1) according to a ninth aspect is the fire warning detection system (1) of any of the first to eighth aspects, further comprising a second sensor (3) different from the first sensor (2). The second sensor (3) is provided in the first space (10). The second sensor (3) detects at least one of heat and smoke due to a fire in the first space (10).

[0083] According to the fire sign detection system (1) of the above aspect, it is possible to detect whether or not a fire has occurred in the entire first space (10).

[0084] In a fire warning detection system (1) according to a tenth aspect, in the ninth aspect, the second sensor (3) is provided in the second space (51).

[0085] According to the fire sign detection system (1) of the above aspect, it is possible to detect whether or not a fire has occurred in the entire first space (10).

[0086] REFERENCE SIGNS 1 Fire warning detection system 2 Furniture sensor (sensor, first sensor) 3 Area sensor (second sensor) 10 Monitored space (first space) 5 Furniture 51 Internal space (second space) 52 Top surface 53 Intermediate surface 6 Power distribution equipment 7 Electrical equipment

Claims

1. A fire warning detection system comprising: a sensor installed in a second space which is a part of a first space that is the target of fire warning detection and in which a power distribution equipment and an electrical device connected to the power distribution equipment are arranged, the sensor being installed so as to protrude downward from an upper end surface of a fixture that constitutes at least a part of the outer edge of the second space.

2. The fire detection system according to claim 1, wherein the sensor is a gas sensor.

3. The fire warning detection system according to claim 2, wherein the sensor detects at least one of formaldehyde, carbon monoxide, ammonia, and hydrogen chloride.

4. The fire detection system according to claim 1, wherein the sensor is a particulate matter sensor.

5. A fire warning system as claimed in any one of claims 1 to 4, wherein the electrical device has a contact terminal.

6. A fire warning detection system as claimed in any one of claims 1 to 5, further comprising a second power distribution facility different from the first power distribution facility which supplies power to the sensor.

7. A fire warning system according to any one of claims 1 to 5, wherein the power distribution equipment supplies power to the sensor.

8. A fire warning detection system as described in any one of claims 1 to 7, comprising a plurality of sensors, the fixture having an intermediate surface different from the top surface, and the plurality of sensors being positioned on the top surface of the fixture and on the intermediate surface of the fixture.

9. A fire warning detection system as described in any one of claims 1 to 8, further comprising a second sensor different from the first sensor provided in the first space, the second sensor detecting at least one of heat and smoke due to a fire in the first space.

10. A fire warning detection system as described in claim 9, wherein the second sensor is provided in the second space.

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