JP2022014392A - Sensor, disaster prevention system, fire determination method, and program - Google Patents

Abstract

To provide a sensor, a disaster prevention system, a fire determination method, and a program which can improve reliability related to fire determinations.SOLUTION: A sensor 1 includes a plurality of heat detection elements 30 and a determination unit 91. The determination unit 91 determines the occurrence of a fire by collating a plurality of detection values, related to heat respectively detected in the plurality of heat detection elements 30, with predetermined determination conditions. A disaster prevention system comprises the one or more sensors 1 and a receiver (receiving terminal) Y1. The receiver Y1 communicates with the one or more sensors 1 and receives a notification related to the occurrence of fire.SELECTED DRAWING: Figure 3

Description

The present disclosure generally relates to a detector, a disaster prevention system, a fire determination method, and a program. And about the program.

Patent Document 1 discloses a fire detector provided with one rod-shaped thermistor having a thermistor chip serving as a heat-sensitive portion at the tip as a sensing means. The thermistor is mounted on the underside of the circuit board so that it faces downward when the fire detector is attached. The fire detector has a structure in which the outer periphery of the thermistor is covered with an opening in the bottom plate and the peripheral wall of the protector, and ventilation is possible from the detection space toward the thermistor.

Japanese Patent Application Laid-Open No. 2002-352344

In the fire detector disclosed in Patent Document 1, since there is only one place where heat is detected, the reliability of fire determination varies depending on the positional relationship between the place where the fire occurred and the place where the fire detector is arranged. May occur.

This disclosure is made in view of the above reasons, and an object of the present invention is to provide a detector, a disaster prevention system, a fire judgment method, and a program capable of improving the reliability of fire judgment.

The sensor of one aspect of the present disclosure includes a plurality of heat detection elements and a determination unit. The determination unit determines the occurrence of a fire by comparing a plurality of detection values relating to heat detected by the plurality of heat detection elements with predetermined determination conditions.

The disaster prevention system of one aspect of the present disclosure includes one or more of the above-mentioned detectors and a receiving terminal. The receiving terminal communicates with one or more of the detectors to receive a notification regarding the occurrence of a fire.

The fire determination method of one aspect of the present disclosure includes an acquisition step and a determination step. In the acquisition step, a plurality of detection values relating to heat detected by each of the plurality of heat detection elements of the sensor are acquired. In the determination step, the occurrence of a fire is determined by comparing the acquired plurality of detected values with predetermined determination conditions.

The program of one aspect of the present disclosure is a program for causing one or more processors to execute the above-mentioned fire determination method.

According to the present disclosure, there is an advantage that the reliability of fire determination can be improved.

FIG. 1A is an external perspective view of a sensor included in the disaster prevention system according to the embodiment. FIG. 1B is a top view of the same sensor with the back cover removed. FIG. 2 is a cross-sectional view of the same sensor. FIG. 3A is a block configuration diagram of the same sensor. FIG. 3B is a block configuration diagram of a receiver provided in the disaster prevention system of the above. FIG. 4 is a conceptual diagram showing the overall configuration of the disaster prevention system as described above. FIG. 5 is a flowchart for explaining an operation example relating to the fire determination process and the estimation process in the same detector. FIG. 6 is a conceptual diagram for explaining the position specifying process in the disaster prevention system of the above. FIG. 7 is a flowchart for explaining an operation example related to the position specifying process in the disaster prevention system of the above.

(1) Overview Each figure described in the following embodiments is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Not necessarily.

The disaster prevention system 100 (see FIG. 4) according to the present embodiment communicates with one or more detectors 1 (six are shown in FIG. 4) and one or more detectors 1 to receive a notification regarding the occurrence of a fire. It is equipped with a receiving terminal. Here, as an example, it is assumed that the disaster prevention system 100 is configured as an automatic fire alarm system installed in a facility 500 (see FIG. 6) such as an office building. Therefore, it is assumed that the "reception terminal" is the receiver Y1 (see FIGS. 3B and 4) of the automatic fire alarm system.

In addition to office buildings, facility 500 includes theaters, movie theaters, public halls, amusement parks, complex facilities, restaurants, department stores, schools, hotels, inns, hospitals, geriatric homes, kindergartens, libraries, museums, museums, underground streets, and stations. , An airport, a condominium (apartment), a detached house, or the like.

The receiving terminal is not limited to the receiver Y1 of the automatic fire alarm system. For example, if the facility 500 is a detached house, the receiving terminal may be a housing information board or a controller of HEMS (Home Energy Management System). The receiving terminal may be an information terminal such as a smartphone, a tablet terminal, or a personal computer. Alternatively, the receiving terminal may be a server installed outside the facility 500.

The detector 1 according to the present embodiment is, for example, a fire detector, and includes a heat detection unit 3 (see FIGS. 1B and 3A) that detects heat generated by a fire or the like. In other words, the sensor 1 is a sensor having at least a function of detecting heat. However, the detector 1 may be a so-called compound fire detector that further includes a smoke detection unit that detects smoke. The detector 1 may further include a detection unit that detects the generation of CO (carbon monoxide) due to flame, gas leak, or incomplete combustion.

As shown in FIG. 1A, the detector 1 is installed on the installation surface X11 of the structure X1 (ceiling in the illustrated example) which is a building material for the ceiling (or wall or the like) of the facility 500, for example.

As shown in FIG. 3A, the sensor 1 according to the present embodiment includes a plurality of heat detection elements 30 and a determination unit 91. Here, as an example, the sensor 1 includes eight heat detection elements 30. The eight heat detection elements 30 are mounted on the substrate 2. The heat detection element 30 is, for example, a chip thermistor that detects the heat of the gas flowing in from the opening 7 of the housing 5.

The determination unit 91 is configured to determine the occurrence of a fire by comparing a plurality of detection values relating to heat detected by the plurality of heat detection elements 30 with predetermined determination conditions. That is, the target to be compared with the predetermined determination condition is the detection value of all the heat detection elements 30. The "predetermined determination condition" referred to here includes, for example, a condition relating to determination (or selection) of a "target value" to be compared with a threshold value for fire determination from a plurality of detected values. As an example, a predetermined determination condition includes obtaining an average value (target value) of a plurality of detected values.

According to this configuration, it is possible to realize a comprehensive fire determination using a plurality of detection values detected by the plurality of heat detection elements 30. Therefore, it is possible to reduce the possibility that the reliability of the fire determination varies depending on the positional relationship between the place where the fire has occurred and the place where the fire detector is arranged. As a result, it is possible to improve the reliability of fire determination.

Further, the fire determination method according to the present embodiment includes an acquisition step and a determination step. In the acquisition step, a plurality of detection values relating to heat detected by the plurality of heat detection elements 30 of the sensor 1 are acquired. In the determination step, the occurrence of a fire is determined by comparing the acquired plurality of detected values with predetermined determination conditions. Here, as an example, the fire determination method including this determination step is used on the sensor 1. Even in this configuration, it is possible to improve the reliability of fire determination. The fire determination method including the determination step can also be embodied in the program. The program according to the present embodiment is a program for causing one or more processors to execute a fire determination method including a determination step.

By the way, the disaster prevention system 100 according to the present embodiment includes one or more detectors 1 having a plurality of heat detection elements 30 and an estimation unit E1 (see FIG. 3A). The estimation unit E1 estimates the fire occurrence direction D1 (see FIG. 6) in the monitoring region R1 (see FIG. 6) based on the heat detection results of the plurality of heat detection elements 30. Here, as an example, as shown in FIG. 3A, it is assumed that the function of the estimation unit E1 is provided in the control unit 9 of the sensor 1.

According to this configuration, not only the determination information as to whether or not a fire has occurred but also the estimation result regarding the fire occurrence direction D1 can be obtained. As a result, it becomes easier to provide more advanced fire information.

Further, the fire determination method according to the present embodiment includes an acquisition step and an estimation step. In the acquisition step, the detection results regarding heat in the plurality of heat detection elements 30 of one or more detectors 1 are acquired. In the estimation step, the fire occurrence direction D1 in the monitoring area R1 is estimated based on the acquired detection result. Here, as an example, the fire determination method including this estimation step is used on the disaster prevention system 100. Even in this configuration, it is possible to facilitate the provision of more advanced fire information. A fire determination method including an estimation step can also be embodied in a program. The program according to the present embodiment is a program for causing one or more processors to execute a fire determination method including an estimation step.

(2) Details (2.1) Overall configuration of the system The overall configuration of the disaster prevention system 100 according to the present embodiment will be described in detail below.

It is assumed that the disaster prevention system 100 is configured as an "automatic fire alarm system" as described above. The disaster prevention system 100 is installed in a facility 500 (see FIG. 6) such as an office building.

The disaster prevention system 100 includes one receiver Y1 (reception terminal) and a plurality of (two or more) detectors 1. The plurality of detectors 1 are connected to the receiver Y1 by, for example, a feed wiring using a pair of signal lines L1 (two-wire system). Although detailed description is omitted here, the disaster prevention system 100 includes a plurality of signal lines L1 (three in FIG. 4). Then, a signal line L1 is wired for each monitoring area R1 (for example, for each floor) of the facility 500, and a plurality of detectors 1 installed for each monitoring area R1 are connected to the receiver Y1 via the signal line L1. connect.

The disaster prevention system 100 further includes a plurality of termination devices 101. The termination device 101 is arranged at the termination of each signal line L1 (the end opposite to the receiver Y1). The terminating device 101 has a terminating resistor, and the pair of electric wires of the signal line L1 are electrically connected via the terminating resistor. Therefore, the receiver Y1 can detect the disconnection of the signal line L1 by monitoring the current flowing between the pair of electric wires.

The plurality of detectors 1 monitor the monitoring area R1 in the facility 500. In the example of FIG. 6, for convenience of explanation, only three detectors 1 installed in one room such as a conference room corresponding to a part of the monitoring area R1 are shown. However, the number of detectors 1 is not particularly limited.

The details of the configuration of each sensor 1 will be described later, but as shown in FIG. 3A, it includes a heat detection unit 3 for detecting heat and a communication unit 11 (communication interface). The communication unit 11 of each sensor 1 and the receiver Y1 can communicate with each other via the signal line L1.

Each sensor 1 has a notification function. The notification function is a function of switching between the signal lines L1 from a non-short-circuited state to a short-circuited state. When each detector 1 detects the occurrence of a fire, the notification function transmits a signal for notifying the occurrence of a fire (hereinafter referred to as "fire alarm") to the receiver Y1. In other words, the communication unit 11 of each detector 1 transmits a fire alarm notifying the occurrence of a fire via the signal line L1. That is, the detector 1 here is a contact type fire detector used in a so-called P-type (Proprietary-type) communication type automatic fire alarm system. However, the communication method is not limited to the P type. For example, the detector 1 may transmit a fire alarm by a so-called R-type (Record-type) communication method. Further, the disaster prevention system 100 may further include one or more repeaters that relay communication between the receiver Y1 and the plurality of detectors 1.

Further, each sensor 1 has a communication function in addition to the notification function. The communication function is a function of bidirectionally communicating with the receiver Y1 by using a transmission signal transmitted on the signal line L1. When the communication unit 11 of each sensor 1 receives a transmission signal from the receiver Y1 including an address request for requesting the address (identifier) of the alarm source of the fire alarm at the time of issuing the alarm (when transmitting the fire alarm), The pre-assigned address is transmitted to the receiver Y1 by using the communication function.

The disaster prevention system 100 is basically configured so that the detector 1 detects the occurrence of a fire and the detector 1 notifies the receiver Y1 of the occurrence of a fire. However, the disaster prevention system 100 may further include one or more transmitters. The transmitter has, for example, a push button switch, and when a person in the facility 500 discovers a fire, the push button switch is manually operated (pressed) to notify the receiver Y1 of the occurrence of a fire. It is a device to do. The transmitter may be connected to the receiver Y1 by the feed wiring using the signal line L1 as in the sensor 1.

The disaster prevention system 100 may have a function of interlocking with other equipment such as smoke prevention equipment or emergency broadcasting equipment. In this case, the disaster prevention system 100 can control the fire door of the smoke prevention and exhaust equipment when a fire occurs, and can notify the occurrence of the fire by sound or voice in the emergency broadcasting equipment.

(2.2) Sensor (2.2.1) Overall configuration of the sensor Hereinafter, regarding the configuration of the sensor 1 according to the present embodiment, attention will be paid to one of the plurality of detectors 1. I will explain.

It is assumed that the detector 1 is installed on the ceiling surface (one surface of the structure X1) of the facility 500 as in the example of FIG. 1A.

The up-down and left-right directions of the sensor 1 will be described by defining them using the up-down and left-right arrows shown in FIG. Here, the thickness direction of the substrate 2 of the sensor 1 coincides with the vertical direction, and the arrangement direction of the pair of auxiliary ports 7C (vertical holes) coincides with the horizontal direction. These arrows are provided for the purpose of assisting explanation only and are not accompanied by substance. Further, these directions are not intended to limit the direction in which the sensor 1 is used.

As shown in FIG. 3A, the detector 1 includes a heat detection unit 3 having a total of eight heat detection elements 30, a control unit 9, a display unit 10, and the above-mentioned communication unit 11. Further, the sensor 1 further includes a substrate 2 and a housing 5 as shown in FIGS. 1A, 1B, and 2. Further, the sensor 1 further includes a mounting portion 12 (see FIG. 2) for mounting on the structure X1. The sensor 1 is detachably attached to a disk-shaped attachment base fixed to the structure X1 via the attachment portion 12.

By mechanically connecting the mounting portion 12 to the mounting base on the structure X1 side, electrical connection between the connection terminal inside the sensor 1 and the contact portion of the mounting base is also achieved. As a result, when the mounting portion 12 is connected to the mounting base, the control unit 9 and the communication unit 11 mounted on the board 2 are connected to the electric wire on the back side of the structure X1 via the connection terminal and the contact unit. It is electrically connected to (feed line and signal line L1).

When the detector 1 detects a fire, it transmits a fire alarm notifying the occurrence of a fire to the receiver Y1 via the communication unit 11, and also receives a signal from the receiver Y1. The sensor 1 is powered by a receiver Y1, a repeater, or a commercial power source. However, the sensor 1 may be supplied with electric power by a battery provided inside the housing 5.

(2.2.2) Housing The housing 5 houses a substrate 2, a heat detection unit 3, a control unit 9, a display unit 10, a communication unit 11, and the like. That is, the housing 5 accommodates a plurality of heat detecting elements 30.

The housing 5 is made of synthetic resin, for example, flame-retardant ABS resin. The housing 5 is formed in a cylindrical shape that is flat in the vertical direction as a whole. As shown in FIG. 2, the housing 5 has a cylindrical front cover 51 having one surface (upper surface in the illustrated example) open, and a disk-shaped back cover 52. The housing 5 has a facing surface 55 (see FIG. 2) facing the structure X1 when the housing 5 is attached to the structure X1. Here, the upper surface of the back cover 52 corresponds to the facing surface 55. The housing 5 is configured by assembling the back cover 52 to the front cover 51 from the open one side.

Further, as shown in FIGS. 1A and 2, the housing 5 has an opening 7 for allowing gas (hot air) to flow into the inside. The opening 7 has a plurality of side openings 7A (horizontal holes), one inflow port 7B (vertical holes), and a pair of auxiliary openings 7C (vertical holes). Here, the opening 7 is provided in the front cover 51.

As shown in FIGS. 1A and 2, the front cover 51 has a flat cylindrical body 510 with both upper and lower ends open, a disk-shaped base 511 below the cylindrical body 510, and a cylindrical body 510 and a base. Includes a plurality of pillars 512 connecting the 511s.

The cylindrical body 510, the base portion 511, and the plurality of pillar portions 512 are integrally formed. The plurality of pillar portions 512 are arranged at substantially equal intervals along the circumferential direction at the peripheral edge portion of the base portion 511, and project from the peripheral edge portion toward the open lower edge portion of the cylindrical body 510. The plurality of pillar portions 512 keep the distance between the cylindrical body 510 and the base portion 511 at a predetermined distance. The plurality of side openings 7A are arranged at substantially equal intervals along the circumferential direction of the peripheral wall of the front cover 51 configured in this way.

Each side surface opening 7A is a substantially rectangular through hole penetrating the peripheral wall of the front cover 51 in the radial direction, and serves as a opening connecting the internal flow path of the housing 5 and the external space. Each side surface opening 7A is located between adjacent pillar portions 512 and pillar portions 512. The inflow port 7B is a circular through hole penetrating the base portion 511 in the thickness direction, and serves as a port connecting the internal flow path of the housing 5 and the external space. The inflow port 7B is provided on the outer surface 53 (that is, the lower surface of the base portion 511) on the side opposite to the facing surface 55 in the housing 5. The inflow port 7B is arranged in the center thereof, for example, when viewed from the front of the outer surface 53. As shown in FIG. 2, the pair of auxiliary openings 7C are arranged near both the left and right edges of the outer surface 53. Each auxiliary port 7C is a substantially rectangular through hole that penetrates the base portion 511 in the thickness direction, and like each side surface port 7A and the inflow port 7B, is a port that connects the internal flow path of the housing 5 and the external space. It becomes.

Further, the front cover 51 has a plurality of ribs for positioning the substrate 2 on the upper surface facing the substrate 2. Further, the front cover 51 has a plurality of control plates 522 (see FIG. 1B) that control the flow of gas in the housing 5. Specifically, a pair of control plates 522 are provided so as to expand inward from the back side of each pillar portion 512. The plurality of control plates 522 control (induce) the air flow so that the gas flowing in from the side surface opening 7A can flow more easily toward the heat detection element 30.

(2.2.3) Substrate The substrate 2 is a printed circuit board. A heat detection unit 3, a control unit 9, a display unit 10, a communication unit 11, and other circuit modules are mounted on the substrate 2.

As shown in FIG. 1B, the substrate 2 is formed in a substantially circular shape as a whole in a plan view. As shown in FIG. 2, the substrate 2 has a first surface 21 (here, a lower surface) on the side of the inflow port 7B and a second surface 22 (here, an upper surface) opposite to the first surface 21. is doing. In this embodiment, all eight heat detection elements 30 of the heat detection unit 3 are surface-mounted on the second surface 22 of one substrate 2. That is, the sensor 1 includes one substrate 2, and the plurality of heat detection elements 30 are mounted on one substrate 2. Therefore, it is possible to suppress an increase in the number of parts as compared with the case where, for example, a plurality of heat detection elements 30 are dispersedly mounted on a plurality of substrates. In addition, it is possible to suppress variations in the arrangement of the plurality of heat detection elements 30.

A plurality of electronic components constituting the control unit 9, the communication unit 11, and the like are also mounted on the second surface 22 of the substrate 2, for example. The plurality of electronic components constituting the control unit 9, the communication unit 11, and the like do not have to be mounted on only one board 2. For example, another mounting board is arranged around the board 2. A part or all of them may be mounted on the mounting board.

Hereinafter, the structure of the substrate 2 will be described in detail. As shown in FIG. 1B, the substrate 2 has a main body portion 200 and six extension portions 201. The main body 200 has a substantially circular shape. The six extension portions 201 are arranged at substantially equal intervals in the circumferential direction on the peripheral edge of the main body portion 200, and each extension portion 201 extends in a direction away from the center of the main body portion 200. As an example, the substrate 2 has a six-fold symmetric shape that becomes symmetric by rotating it 60 degrees around its center.

As shown in FIGS. 1B and 2, the main body portion 200 has a hole portion 25 penetrating in the thickness direction at the center thereof. The hole 25 has a substantially circular opening. The hole 25 is arranged so as to overlap the inflow port 7B when viewed from the front of the inflow port 7B.

As shown in FIG. 2, the main body portion 200 has a pair of protrusions 26 protruding toward each other along the left-right direction at the opening edge of the hole 25. The tips of the pair of protrusions 26 are exposed from the inflow port 7B when viewed from the front of the inflow port 7B. Then, one heat detection element 30 (chip thermistor) is mounted on the upper surface near the tip of each protrusion 26.

Further, one heat detection element 30 (chip thermistor) is mounted on the upper surface near the tip of each of the six extension portions 201.

Hereinafter, among the total of eight heat detection elements 30, the six heat detection elements 30 in the six extension portions 201 are referred to as "main heat detection elements 30A", and the pair of heat detection elements 30 in the pair of protrusions 26. May be referred to as "auxiliary heat detection element 30B". Further, the six main heat detection elements 30A are referred to as the first to sixth heat detection elements 301 to 306, respectively, and the heat detection element 30 on the right side of the pair of auxiliary heat detection elements 30B is referred to as the seventh heat detection element 307. The heat detection element 30 on the left side may be referred to as an eighth heat detection element 308. The pair of auxiliary heat detecting elements 30B are mounted on the second surface 22 of the substrate 2 so as to be along the peripheral edge of the inflow port 7B when viewed from the front of the inflow port 7B.

Further, the substrate 2 has a through hole 31 that penetrates the substrate 2 in the thickness direction in the vicinity of each heat detection element 30. Specifically, the through hole 31 in the vicinity of each main heat detecting element 30A is opened in a substantially rectangular shape, and is arranged on the opposite side (inside) of the main heat detecting element 30A from the side opening 7A. The through hole 31 in the vicinity of each auxiliary heat detecting element 30B is opened in a substantially triangular shape, and is arranged on the opposite side (outside) of the hole portion 25 from the auxiliary heat detecting element 30B.

By providing such a through hole 31 near each heat detection element 30, the area occupied by the substrate 2 around the heat detection element 30 can be reduced. Therefore, the through hole 31 suppresses the heat generation of the plurality of electronic components constituting the control unit 9, the communication unit 11, etc. from transmitting to the substrate 2 and affecting the heat detection element 30. Further, the through hole 31 suppresses that the heat in the heat detecting element 30 is transmitted to the substrate 2 and the temperature of the heat detecting element 30 becomes low. That is, the through hole 31 improves the thermal insulation. It is desirable that the opening area of the through hole 31 is larger than the surface area of the heat detection element 30 (for example, the surface area seen from the upper side of the substrate 2).

The display unit 10 has a plurality of light sources such as LEDs (Light Emitting Diodes). The plurality of light sources are mounted on the substrate 2. The plurality of light sources include two light sources corresponding to working lights. The light emitted from the operating lamp is emitted from two window holes 533 (see FIG. 1A) provided on the outer surface 53 of the front cover 51 via a guide portion such as a light guide lens.

(2.2.4) Heat Detection Unit and Control Unit The heat detection unit 3 has eight heat detection elements 30 mounted on the second surface 22 of the substrate 2 as described above. The number of heat detection elements 30 is not particularly limited as long as it is two or more. Each heat detection element 30 in the present embodiment is a chip thermistor that detects the heat of the gas flowing in from the opening 7, and is surface-mounted on the substrate 2. As the heat detection element 30, it is assumed that an NTC (Negative Temperature Coefficient) thermistor is used, but a PTC (Positive Temperature Coefficient) thermistor may also be used.

The six main heat detection elements 30A (plurality of heat detection elements 30) are viewed along the direction (here, the vertical direction) intersecting the installation surface X11 on which the sensor 1 is installed, and the center 5A of the housing 5 (here, the vertical direction). It is arranged in the peripheral area 50 surrounding (see FIG. 1B). In FIG. 1B, in order to make the peripheral region 50 easier to understand, it is shown by dot hatching surrounded by an alternate long and short dash line, but it is not intended to strictly limit the range of the peripheral region 50. The six main heat detecting elements 30A are arranged at substantially equal intervals in the peripheral region 50.

Further, the six main heat detecting elements 30A are arranged so as to face each of the plurality of side openings 7A of the opening 7 on a one-to-one basis. Further, the two extension portions 201 on which the second heat detection element 302 and the fifth heat detection element 305 of the six main heat detection elements 30A are mounted face each other with the two auxiliary ports 7C of the opening 7. It is arranged like this.

As shown in FIG. 1B, the first heat detection element 301, which is one of the six main heat detection elements 30A, has a mark M1 (described later) and a housing when viewed from above the second surface 22 of the substrate 2. It is arranged on a virtual line segment Q1 connecting the center 5A of 5. Further, the second heat detection element 302 to the sixth heat detection element 306 are 60 degrees, 120 degrees, 180 degrees, and 240 degrees counterclockwise with respect to the line segment Q1 when viewed from the upper side of the second surface 22 of the substrate 2. , And at intervals of 300 degrees, respectively.

Each auxiliary heat detection element 30B is located at a position that is generally within the projection area of the inflow port 7B or is slightly deviated from the projection area when viewed from the front of the inflow port 7B of the opening 7. Implemented on 2.

The heat detection unit 3 is electrically connected to the control unit 9 via a pattern wiring or the like formed on the substrate 2. Each heat detection element 30 outputs an electric signal (detection signal) to the control unit 9. In other words, the control unit 9 monitors the resistance value of each heat detection element 30 that may change depending on the temperature rise through the electric signal output from each heat detection element 30.

In addition to the heat detection element 30, the heat detection unit 3 may further include an amplifier circuit for amplifying an electric signal from the heat detection element 30, a conversion circuit for analog-to-digital conversion, and the like, or the amplification and conversion may be performed. , May be performed on the control unit 9 side.

The control unit 9 can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, one or more processors execute one or more programs stored in one or more memories, thereby functioning as each unit of the control unit 9. Although the program is recorded in advance in the memory of the control unit 9 here, it may be recorded and provided through a telecommunication line such as the Internet or a non-temporary recording medium such as a memory card.

As shown in FIG. 3A, the control unit 9 has a determination unit 91, a diagnosis unit 92, and an estimation unit E1. In other words, the control unit 9 has a function as a determination unit 91, a function as a diagnosis unit 92, and a function as an estimation unit E1. The details of the estimation unit E1 will be described in the next column.

The determination unit 91 is configured to receive a detection signal from the heat detection unit 3 and determine whether or not a fire has occurred (fire determination process). In particular, the determination unit 91 determines the occurrence of a fire in the monitoring area R1 by comparing a plurality of detection values relating to heat detected by the plurality of heat detection elements 30 with predetermined determination conditions (determination step). Specifically, the determination unit 91 monitors the detection signals from the eight heat detection elements 30 of the heat detection unit 3, and illuminates the signal levels (plural detection values) of these detection signals with predetermined determination conditions. At the same time, determine the occurrence of a fire. The "detection value" here may be any of a voltage (value) output from the heat detection element 30, a resistance value of the heat detection element 30 calculated from the voltage value, or a temperature value corresponding to the resistance value. .. In the following description, as an example, it is assumed that the "detection value" is a temperature value.

Here, the "predetermined determination condition" will be described in detail. The predetermined determination condition includes at least one of the following first to sixth determination conditions.

The first determination condition is "select the maximum value from a plurality of detected values". When the predetermined determination condition includes the first determination condition, the determination unit 91 determines whether or not a fire has occurred based on at least the maximum value. The determination unit 91 is, for example, out of eight temperature values (detection values) of the eight heat detection elements 30 acquired at a certain timing (in this case, the predetermined determination condition includes the fifth determination condition described later). Select the highest temperature value (maximum value) and compare the temperature value with the temperature threshold value for fire judgment. The control unit 9 stores the temperature threshold value (information) in the memory in advance. If the highest temperature value exceeds the temperature threshold value, the determination unit 91 determines that a fire has occurred. By applying the first determination condition, for example, by comparing with the same temperature threshold value, until the determination unit 91 determines that a fire has occurred, as compared with the case where the determination is based on the lowest temperature value (minimum value). It becomes easier to shorten the time for fire (improvement of responsiveness regarding fire judgment).

The second determination condition is "select the minimum value from a plurality of detected values". When the predetermined determination condition includes the second determination condition, the determination unit 91 determines whether or not a fire has occurred based on at least the minimum value. For example, the determination unit 91 selects the lowest temperature value (minimum value) from the eight temperature values (detection values) of the eight heat detection elements 30 acquired at a certain timing, and determines the temperature value as a fire. Compare with the temperature threshold for. If the lowest temperature value exceeds the temperature threshold value, the determination unit 91 determines that a fire has occurred. By applying the second determination condition, for example, by comparing with the same temperature threshold value, the determination unit 91 determines that a fire has erroneously occurred as compared with the case where the determination is based on the highest temperature value (maximum value). It is possible to reduce the possibility of fire (reduction of false alarms).

The third determination condition is "to obtain the number of heat detection elements 30 that have detected a detection value exceeding the threshold value for fire determination among the plurality of heat detection elements 30 that have detected a plurality of detection values." When the predetermined determination condition includes the third determination condition, the determination unit 91 determines whether or not a fire has occurred based on at least the number of heat detection elements 30. For example, the determination unit 91 compares all eight temperature values (detection values) of the eight heat detection elements 30 acquired at a certain timing with the temperature threshold value for fire determination. The control unit 9 stores the number threshold value (information) for determination in the memory in advance. The determination unit 91 obtains the number of temperature values (detection values) that have exceeded the temperature threshold value for fire determination (that is, the number of heat detection elements 30), and compares the number with the number threshold value. If the number of heat detection elements 30 is equal to or greater than the number threshold value (4 as an example), the determination unit 91 determines that a fire has occurred. By applying the third determination condition, it is possible to reduce the possibility that the determination unit 91 mistakenly determines that a fire has occurred (reduction of false alarms).

The fourth determination condition is "to obtain the average value of a plurality of detected values". When the predetermined determination condition includes the fourth determination condition, the determination unit 91 determines whether or not a fire has occurred, at least based on the average value. The determination unit 91 obtains an average temperature value (average value) from eight temperature values (detection values) of the eight heat detection elements 30 acquired at a certain timing, and uses the average temperature value as the temperature for fire determination. Compare with the threshold. If the average temperature value exceeds the temperature threshold value, the determination unit 91 determines that a fire has occurred. By applying the fourth determination condition, the reliability regarding the fire determination is further improved.

The fifth determination condition is "use a plurality of detection values acquired from a plurality of heat detection elements 30 at the same timing". The determination unit 91 executes a comparative determination regarding any of the above-mentioned first to fourth determination conditions using, for example, eight temperature values (detection values) of the eight heat detection elements 30 acquired at substantially the same timing. do. During fire monitoring, the determination unit 91 repeatedly acquires eight temperature values (detection values) at the same time according to a predetermined sampling cycle and executes a comparison determination. By applying the fifth determination condition, the responsiveness regarding the fire determination can be enhanced.

However, it is not essential that the predetermined determination condition includes the fifth determination condition. The determination unit 91 may perform peak hold for a certain period of time, for example, with respect to the temperature value acquired from each heat detection element 30. The determination unit 91 obtains the peak value (detection value) of the temperature value of each heat detection element 30, and uses the eight peak values of the eight heat detection elements 30 to make a comparison regarding any of the first to fourth determination conditions. The determination may be performed.

The sixth determination condition is "to specify outliers from a plurality of detected values and use the detected values excluding the outliers from the plurality of detected values". In the present embodiment, the determination unit 91 basically makes a fire determination by comparing all eight temperature values (detection values) of the eight heat detection elements 30 with predetermined determination conditions. However, if any of the eight heat detection elements 30 has an abnormality such as a failure or disconnection (which may include dirt and deterioration over time), the temperature value from the heat detection element 30 may show an abnormal value. There is. For example, only the temperature value of one heat detection element 30 may be extremely small, extremely large, or almost unchanged (substantially constant) as compared with the temperature value of the other heat detection element 30. When a comparative judgment regarding any of the above-mentioned first to fourth judgment conditions is executed using all eight temperature values including such an abnormal value, it takes time to exceed the threshold value and a fire occurs. There may be a delay in the time until detection, or an erroneous determination may occur. The determination unit 91 considers the temperature value indicating such an abnormal value as an outlier, excludes it from the eight temperature values, and then executes a comparative determination regarding any of the above-mentioned first to fourth determination conditions. By applying the sixth determination condition, when a comprehensive fire determination using a plurality of detection values detected by the plurality of heat detection elements 30 is realized, a delay or erroneous determination until detection due to the influence of outliers is realized. Can be further reduced.

In this way, when the control unit 9 determines that a fire has occurred by comparing the plurality of detected values with predetermined determination conditions, the control unit 9 sends a signal (fire report) notifying the occurrence of the fire via the communication unit 11. , Transmit to receiver Y1. Further, when the control unit 9 determines that a fire has occurred, it outputs a control signal for blinking or lighting the light source of the display unit 10 (operating light) to the lighting circuit.

The user or the installer may be able to appropriately select which of the first to sixth determination conditions the sensor 1 applies, depending on the installation environment of the sensor 1. For example, in response to the operation input to the receiver Y1, the receiver Y1 may be able to transmit setting information such as adopting the first determination condition to the sensor 1. The sensor 1 selects and sets the first determination condition based on the setting information received from the receiver Y1. Alternatively, the sensor 1 may accept the setting of the determination condition according to the operation of the DIP switch or the like provided in the housing 5.

By the way, when the predetermined determination condition includes any two or more of the above-mentioned first to fourth determination conditions, the temperature threshold values for fire determination used in each determination condition may be shared as the same value. However, they may be set individually as different values from each other. For example, when the predetermined determination condition includes the first determination condition (maximum value) and the fourth determination condition (average value), the temperature threshold value used in the first determination condition is a value different from the temperature threshold value used in the fourth determination condition. As a result, they may be individually stored in the memory. When the predetermined determination condition includes any two or more of the first to fourth determination conditions, for example, when a fire has occurred in all of the two or more determination conditions, the control unit 9 issues a fire report. Send.

The diagnostic unit 92 is configured to make a diagnosis regarding the occurrence of an internal event in the sensor 1 itself based on a plurality of detected values. The "internal event" as used herein means an abnormality that may occur in the sensor 1 itself, such as deterioration over time, dirt, failure, or disconnection. The occurrence of an internal event may affect the fire determination of the determination unit 91. Therefore, the diagnosis unit 92 periodically (for example, once a day) executes the diagnosis process during the fire monitoring. The diagnostic process may be started in response to a user operation on the operation unit of the sensor 1 or the receiver Y1. In the diagnostic process, the diagnostic unit 92 determines whether or not an internal event has occurred from the eight temperature values (detection values) from the eight heat detection elements 30. For example, in the diagnostic process, the diagnostic unit 92 determines the presence or absence of an abnormal heat detection element 30 among the eight heat detection elements 30 from the values of each of the eight temperature values (detection values) or the relative variation. .. The control unit 9 stores the pattern information of the current-voltage characteristics of the heat detection element 30 according to the type of abnormality in the memory in advance, checks the current-voltage characteristics of each heat detection element 30 in the diagnostic process, and stores the current-voltage characteristics in the memory. The type of abnormality may be determined by comparing with the pattern information of.

When the control unit 9 is diagnosed as having an internal event by the diagnostic process of the diagnosis unit 92, the control unit 9 transmits to that effect to the receiver Y1 via the communication unit 11. The receiver Y1 notifies the user of the occurrence of an internal event in the sensor 1 through the display unit Y12 or the like. Further, the control unit 9 changes the lighting state of the display unit 10 (operating light) to notify the user of the occurrence of an internal event.

In this way, the sensor 1 makes a diagnosis regarding the occurrence of internal events (aging deterioration, dirt, failure, disconnection, etc.) that may affect the fire determination from the eight temperature values (detection values), thereby relating to the fire determination. Reliability is further improved.

When the control unit 9 finds an abnormal heat detection element 30 based on the result of the diagnostic processing, in the actual fire determination process, the detection value of the heat detection element 30 is an outlier in the above-mentioned sixth determination condition. It is preferable to exclude it as.

(2.2.5) Fire occurrence direction estimation unit E1 is configured to estimate the fire occurrence direction D1 in the monitoring area R1 based on the heat detection results of the plurality of heat detection elements 30 (estimation step). ). In the present embodiment, as described above, the control unit 9 of the sensor 1 has the function of the estimation unit E1. In other words, the estimation unit E1 is provided in the sensor 1. The estimation unit E1 estimates the fire occurrence direction D1 with respect to the own machine based on the detection result.

When the determination unit 91 determines that a fire has occurred, the estimation unit E1 executes an estimation process for estimating the fire occurrence direction D1. The control unit 9 generates estimation information based on the estimation result. The control unit 9 may transmit the estimated information to the receiver Y1 at the same timing as the fire report, or may transmit the estimated information to the receiver Y1 at a timing different from the fire report.

Here, as an example, in the estimation process, the estimation unit E1 uses the detection values of the six main heat detection elements 30A arranged in the peripheral region 50 among the eight heat detection elements 30, and the fire occurrence direction D1. To estimate. However, the estimation unit E1 may additionally use the detection values of the remaining two auxiliary heat detection elements 30B.

Here, as shown in FIGS. 1A and 1B, the housing 5 has a mark M1 on its outer surface 56. The mark M1 indicates one direction with respect to the center 5A of the housing 5 when viewed along the direction (here, the vertical direction) intersecting the installation surface X11 on which the sensor 1 is installed. There is a correlation between the arrangement position of the plurality of heat detection elements 30 with respect to the center 5A of the housing 5 and the position of the mark M1. In the illustrated example, the mark M1 marked with the acronym "N" for North is provided on the outer surface (outer surface 56) of the cylindrical body 510 of the front cover 51. As described above, the mark M1 is arranged so as to correspond to the first heat detection element 301, which is one of the six main heat detection elements 30A. The detector 1 is installed on the installation surface X11 with the mark M1 facing a specific direction (here, the north direction). The estimation unit E1 estimates the fire occurrence direction D1 with reference to the detector 1 based on the detection result and the correlation. The "detection result" referred to here is six temperature values (detection values) from the six main heat detection elements 30A.

The estimation unit E1 analyzes the ranking of the relative high and low of the six temperature values (detection values), and comprehensively determines which main heat detection element 30A has the most dominant high (or low) temperature value. do. Then, the estimation unit E1 estimates that the direction in which the main heat detection element 30A having the dominant temperature value is arranged is the fire occurrence direction D1.

In particular, here, on the premise that the sensor 1 is arranged with the mark M1 facing the north direction, the control unit 9 stores the following correlation information in the memory in advance. The correlation information includes information that the first heat detection element 301 corresponds to the "north" direction, the second heat detection element 302 corresponds to the "west-northwest" direction, and the third heat detection element 303 corresponds to the "west-southwest" direction. Further, the correlation information includes information that the fourth heat detection element 304 corresponds to the "south" direction, the fifth heat detection element 305 corresponds to the "east-southeast" direction, and the sixth heat detection element 306 corresponds to the "east-northeast" direction. The estimation unit E1 converts the fire occurrence direction D1 into a direction (east, west, north, south) based on the correlation information and estimates it.

More specifically, for example, if the temperature value of the fourth heat detection element 304 is the most dominant value, the estimation unit E1 looks at the substrate 2 from above, and the fourth heat is from the center 5A of the housing 5. The direction "south" toward the position where the detection element 304 is arranged is defined as the fire occurrence direction D1. The number of main heat detecting elements 30A showing the most dominant temperature value is not limited to one. For example, if the two temperature values of the second heat detection element 302 and the third heat detection element 303 are the most dominant values, the estimation unit E1 will detect the second heat detection element 302 and the third heat from the center 5A. The direction "west" toward the midpoint position of the line segment connecting the element 303 is defined as the fire occurrence direction D1.

In this way, the estimation unit E1 estimates the fire occurrence direction D1 from the detection result and the positional relationship of the six main heat detection elements 30A on the premise that the mark M1 is facing north, and further north, south, east, and west. Generate estimation information in a manner associated with the direction of. The generated estimation information is transmitted to the receiver Y1. The receiver Y1 acquires the fire occurrence direction D1 estimated by the detector 1 which is the transmission source of the estimated information based on the detector 1 (own machine) through the received estimated information.

In the present embodiment, as described above, there is a correlation between the arrangement position of the plurality of heat detection elements 30 with respect to the center 5A of the housing 5 and the position of the mark M1. Therefore, for example, the sensor 1 does not need to grasp (for example, store in a memory or the like) which direction each heat detection element 30 corresponds to in the actual installation environment. As a result, the configuration of the sensor 1 can be simplified. Further, by installing the sensor 1 with the mark M1 directed in a specific direction, it becomes easy to link the arrangement positions of the plurality of heat detection elements 30 with the actual direction with respect to the sensor 1.

The conversion function for the north, south, east, and west directions may be provided outside the sensor 1 (for example, the receiver Y1). The estimation unit E1 simply includes information that can identify the main heat detecting element 30A of the dominant temperature value by the receiver Y1 (for example, identification information that can individually identify the six main heat detecting elements 30A). The estimation information may be generated and transmitted to the receiver Y1.

Further, the estimation unit E1 is merely an example of associating the fire occurrence direction D1 with the "direction of north, south, east, and west". Estimated information may be generated in an manner associated with an angle of 360 degrees as a reference (0 degrees).

Further, the disaster prevention system 100 of the present embodiment further includes an output unit G1 (see FIGS. 3A and 3B) that outputs an estimation result of the estimation unit E1. The output unit G1 includes a local output unit G2 that outputs the estimation result of the estimation unit E1 on the side of the sensor 1, and a central output unit G3 that outputs the estimation result of the estimation unit E1 on the side of the receiver Y1.

The local output unit G2 corresponds to the display unit 10 of each sensor 1. For example, the control unit 9 turns on (or blinks) only the corresponding light source among the plurality of light sources of the display unit 10 according to the estimation result, so that the fire occurrence direction D1 is set to the person around the sensor 1. Notify (user). That is, the output unit G1 includes a local output unit G2 provided in one or more detectors 1. Not only the local output unit G2 of the fire source detector 1 that detected the fire, but also the local output unit G2 of the other detector 1 other than the fire source detector 1 is the fire source detector 1 or the receiver. The estimation result may be obtained from Y1 and the fire occurrence direction D1 may be notified.

For example, the plurality of light sources of the display unit 10 include six light sources (direction indicator lamp 10A) that correspond one-to-one with the six main heat detection elements 30A in addition to the two light sources of the operating lamp that emits light from the window hole 533. : See FIG. 1B). In FIG. 1B, for convenience of explanation, the position of the turn signal lamp 10A is simply indicated by dots.

Each of the six direction indicator lights 10A is arranged on the first surface 21 (lower surface) of the main body 200 of the substrate 2 in the vicinity of the corresponding main heat detection element 30A, and the side surface facing the corresponding main heat detection element 30A. Light is emitted to the outside of the housing 5 from the mouth 7A. The control unit 9 turns on (or blinks) only the direction indicator lamp 10A corresponding to the main heat detection element 30A having the dominant temperature value estimated by the estimation unit E1. As a result, by looking at the sensor 1, the user can visually know the direction D1 of the fire occurrence through the direction of the light of the turn signal 10A emitted from the side opening 7A. Therefore, the user can easily use the estimation result of the estimation unit E1 at the installation location where the sensor 1 is installed. For example, the user can promptly confirm whether or not there is a false alarm toward the fire occurrence direction D1 indicated by the direction indicator lamp 10A, and it becomes easy to evacuate so as to avoid the fire occurrence direction D1.

The operation light may also serve as the function of the direction indicator light 10A. Further, six holes for emitting light of the six turn signal lamps 10A may be provided at the base 511 so as to be arranged at equal intervals along the peripheral edge thereof.

The central output unit G3 corresponds to the display unit Y12 included in the receiver Y1 (see FIG. 3B). The display unit Y12 is composed of, for example, a liquid crystal display or an organic EL (Electro Luminescence) display. The receiver Y1 displays on the screen, for example, information that can specify the installation location of the sensor 1 that is the source of the estimated information and the information of the fire occurrence direction D1 estimated by the sensor 1 as character string data. do. As a result, the user can visually know the fire occurrence direction D1 estimated by the sensor 1 by looking at the display unit Y12 of the receiver Y1.

[Operation example]
Hereinafter, an operation example relating to the fire determination process and the estimation process in each of the detectors 1 of the present embodiment will be briefly described with reference to the flowchart of FIG. Here, as an example, it is assumed that the predetermined determination condition includes the fourth determination condition (average value).

The detector 1 executes a fire determination process during operation. That is, the detector 1 acquires the detected values of the eight heat detection elements 30 at any time during operation (acquisition step) and monitors the detected values (ST1).

The sensor 1 obtains an average temperature value from eight temperature values (detection values) of the eight heat detection elements 30 in a predetermined sampling cycle, and compares the average temperature value with a temperature threshold for fire determination (ST2 :). Judgment step). If the average temperature value exceeds the temperature threshold value (ST2: Yes), the sensor 1 determines that a fire has occurred and transmits a fire alarm to the receiver Y1 (ST3). The sensor 1 continues monitoring as long as the average temperature value is equal to or less than the temperature threshold value (ST2: No).

When the detector 1 determines that a fire has occurred, it further starts executing an estimation process for estimating the fire occurrence direction D1 (ST4: estimation step).

In the estimation process, the detector 1 estimates the fire occurrence direction D1, further generates estimation information in a mode associated with the north, south, east, and west directions, and transmits the estimation information to the receiver Y1 (ST5). Further, the detector 1 lights (or blinks) only the corresponding direction indicator lamp 10A of the display unit 10 to notify the surrounding users of the estimated fire occurrence direction D1 (ST6).

On the other hand, when the receiver Y1 receives the fire report, it controls the fire door of the smoke prevention / exhaust equipment and notifies the occurrence of the fire by sound or voice in the emergency broadcasting equipment. Further, the receiver Y1 notifies the estimated fire occurrence direction D1 through the display unit Y12.

The flowchart of FIG. 5 is merely an example of the operation of the sensor 1, and for example, the order of processing may be appropriately changed, and processing may be added or omitted as appropriate.

[advantage]
In the present embodiment, the determination unit 91 determines the occurrence of a fire in the monitoring area R1 by comparing a plurality of detection values relating to heat detected by the plurality of heat detection elements 30 with predetermined determination conditions. Therefore, it is possible to realize a comprehensive fire determination using a plurality of detection values detected by the plurality of heat detection elements 30. Therefore, it is possible to reduce the possibility that the reliability of the fire determination varies depending on the positional relationship between the place where the fire has occurred and the place where the detector 1 is arranged. As a result, it is possible to improve the reliability of fire determination.

Further, in the present embodiment, the estimation unit E1 estimates the fire occurrence direction D1 in the monitoring region R1 based on the heat detection results of the plurality of heat detection elements 30. Therefore, not only the determination information as to whether or not a fire has occurred but also the estimation result regarding the fire occurrence direction D1 can be obtained. As a result, it becomes easier to provide more advanced fire information.

Further, since the plurality of heat detection elements 30 (six main heat detection elements 30A) are arranged in the peripheral region 50, for example, as compared with the case where the plurality of heat detection elements 30 are collectively arranged in the center of the housing 5. , The reliability of the fire determination in the determination unit 91 is further improved. Further, the reliability of the estimation result regarding the fire occurrence direction D1 in the estimation unit E1 can be improved.

Further, in the present embodiment, the estimation unit E1 is provided in the sensor 1, and based on the detection result, the fire occurrence direction D1 is estimated with reference to the own machine (sensor 1). Therefore, since the estimation result regarding the fire occurrence direction D1 can be obtained by the sensor 1 alone, the responsiveness until the estimation result is obtained as compared with the case where the estimation unit E1 is provided outside the sensor 1. Is improved.

(2.2.6) Specifying the position of the fire source Next, the function of further specifying the position of the fire source from the estimated information of the plurality of detectors 1 will be described. The disaster prevention system 100 of the present embodiment further includes a specific unit E2 (see FIG. 3B) that identifies the position P1 (see FIG. 6) of the fire source. The specifying unit E2 identifies the position P1 of the fire source by integrating the estimation results regarding the fire occurrence direction D1 with respect to each detector 1 based on the detection results of each of the two or more detectors 1. Here, as shown in the illustrated example, the function of the specific unit E2 is provided in the processing unit Y11 of the receiver Y1.

The processing unit Y11 can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, one or more processors execute one or more programs stored in one or more memories, thereby functioning as each unit of the processing unit Y11. Although the program is recorded in advance in the memory of the processing unit Y11 here, it may be recorded and provided through a telecommunication line such as the Internet or on a non-temporary recording medium such as a memory card. As described above, the processing unit Y11 has the specific unit E2. The processing unit Y11 controls the display unit Y12 and the communication interface for communicating with each sensor 1.

When the specifying unit E2 receives the estimated information from the plurality of detectors 1 that have detected the fire, the specifying unit E2 executes the position specifying process for specifying the position P1 of the fire source. The specific unit E2 generates specific information based on the specific result. The specific unit E2 displays the specific information on the display unit Y12 on the screen.

Here, the position specifying process will be specifically described with reference to FIG. FIG. 6 shows a floor plan of a part of a floor in the facility 500. In the example of FIG. 6, three detectors 1 (1A to 1C) are installed on the ceiling (structure X1) of one room such as a conference room corresponding to a part of the monitoring area R1. In FIG. 6, each sensor 1 is schematically shown in a circle. For convenience of explanation, the three detectors 1 have a positional relationship such that they are arranged at positions corresponding to the vertices of an equilateral triangle, but they are not shown for the purpose of being limited to this positional relationship. Further, here, as an example, it is assumed that a fire breaks out at a position that is the center of gravity of an equilateral triangle in which the detector 1 is arranged at each apex (see the position P1 of the fire source in FIG. 6).

As shown by the directional mark in FIG. 6, the upper part of the drawing indicates the north direction. All three detectors 1 are installed on the ceiling with the mark M1 facing north.

Here, it is assumed that the receiver Y1 receives the estimated information from each of the three detectors 1 shown in FIG.

The estimated information received from the sensor 1A includes information that the direction D1 of the fire is in the "southeast direction" with respect to the sensor 1A (own machine) (as described above, the predominant temperature value). The identification information of the main heat detection element 30A indicating the above may be used). Further, the estimated information received from the sensor 1B includes information that the fire occurrence direction D1 is in the "southwest direction" with respect to the sensor 1B (own machine). Further, the estimated information received from the sensor 1C includes information that the fire occurrence direction D1 is "north direction" with respect to the sensor 1C (own machine).

Here, the processing unit Y11 previously stores and manages the coordinate information of the positions where the three detectors 1 are arranged in the memory of the own machine. Further, the processing unit Y11 also stores and manages map information (for example, a floor plan as shown in FIG. 6) of each floor in the facility 500 in its own memory. The receiver Y1 may acquire the coordinate information of the sensor 1 and the map information in the facility 500 from, for example, a server installed outside the facility 500.

The specific unit E2 combines the estimated information of the sensor 1A (southeast direction), the estimated information of the sensor 1B (southwest direction), and the estimated information of the sensor 1C (north direction). Specifically, the specific unit E2 specifies, for example, the coordinate information of the intersection position where the three fire occurrence directions D1 estimated by the detectors 1A to 1C intersect on the plane of the X-axis and the Y-axis.

The coordinate information is not limited to the coordinates of one point, but may be a range of coordinates. In particular, there is a possibility that the estimation results of a plurality of fire occurrence directions D1 by the plurality of detectors 1 do not intersect at only one intersection. When there are a plurality of intersections, the specific unit E2 specifies the coordinate information as a coordinate range including those intersections.

When the specific unit E2 specifies the coordinate information of the intersection position, the specific information is generated based on the specific result and notified to the user as the information of the estimated position P1 of the fire source. The coordinate information of the intersection position is converted into a mode that is easy for the user to understand and notified. For example, as shown in FIG. 6, the processing unit Y11 displays the estimated position P1 of the fire source on the display unit Y12 in such a manner that the estimated position P1 can be seen on the floor plan (map information). Alternatively, the processing unit Y11 estimates that it is near the center of the conference room from the coordinate information of the intersection position, and displays the character string data such as "The fire source is near the center of the conference room" on the display unit Y12. May be good.

In this way, the specific unit E2 identifies the position P1 of the fire source by integrating the estimation results regarding the fire occurrence direction D1 of the two or more detectors 1. Therefore, it becomes possible to provide more advanced fire information.

[Operation example]
Hereinafter, an operation example relating to the position specifying process in the disaster prevention system 100 of the present embodiment will be briefly described with reference to the flowchart of FIG.

When the detector 1 determines that a fire has occurred, it transmits a fire alarm to the receiver Y1, further executes an estimation process, and transmits the estimated information to the receiver Y1.

When the receiver Y1 receives a fire alarm from one or more detectors 1 (ST11), it immediately controls the fire door of the smoke prevention and exhaust equipment, and a fire occurs by sound or voice in the emergency broadcasting equipment. (ST12). On the other hand, the receiver Y1 suspends the start of the position specifying process until the estimated information is received from the two or more detectors 1 (ST13). That is, if the number of detectors 1 that have received the estimated information is two or more (ST13: Yes), the receiver Y1 starts executing the position identification process (ST14), and the number is less than two. (ST13: No) Wait.

The receiver Y1 integrates the estimation information of the two or more detectors 1 in the position specifying process (ST15), and specifies the coordinate information of the intersection position where the fire occurrence direction D1 intersects (ST16). The receiver Y1 generates specific information based on the specific result and notifies the user as the information of the estimated position P1 of the fire source (ST17).

After that, when the receiver Y1 receives additional estimation information from the other detector 1, the receiver Y1 also integrates the estimated information of the additional amount, re-executes the position identification process, and updates the position P1 of the fire source to the latest state. It may be updated to be.

The flowchart of FIG. 7 is merely an example of the operation of the disaster prevention system 100, and for example, the order of processing may be appropriately changed, and processing may be added or omitted as appropriate.

(3) Modifications This embodiment is only one of the various embodiments of the present disclosure. The present embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. Further, even if the same functions as the sensor 1 (particularly the control unit 9) and the disaster prevention system according to the above embodiment are embodied in a fire determination method, a computer program, a non-temporary recording medium on which a computer program is recorded, or the like. good.

The detector 1 and the disaster prevention system in the present disclosure include a computer system. The computer system mainly consists of a processor and a memory as hardware. When the processor executes the program recorded in the memory of the computer system, the functions as the control unit 9 of the sensor 1 and the processing unit Y11 of the receiver Y1 in the present disclosure are realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided. The processor of a 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 circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical device capable of reconstructing the junction relationship inside the LSI or reconfiguring the circuit partition inside the LSI should also be adopted as a processor. Can be done. A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. A plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microprocessor is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

Further, it is not essential that a plurality of functions in each of the sensor 1 and the receiver Y1 are integrated in one housing. For example, the components of the sensor 1 may be dispersedly provided in a plurality of housings. On the contrary, a plurality of functions in the sensor 1 may be integrated in one housing. Further, at least a part of the functions of the sensor 1 and the receiver Y1, for example, a part of the functions of the sensor 1 may be realized by a cloud (cloud computing) or the like.

Hereinafter, variations of the above embodiment are listed. The modifications described below can be applied in combination as appropriate. In the following, the above embodiment may be referred to as a "basic example".

In the basic example, the substrate 2 is composed of one printed circuit board. However, the substrate 2 may be divided into two or more printed circuit boards. However, it is desirable that the plurality of divided printed circuit boards are arranged on the same plane.

In the basic example, the number of heat detection elements 30 is eight, but the number is not particularly limited as long as it is two or more. In particular, the auxiliary heat detection element 30B may be omitted. For example, only two main heat detection elements 30A may be used. In this case, it is preferable that one of the two main heat detecting elements 30A is arranged on one end side of the substrate 2 in the left-right direction, and the other is arranged on the opposite side of the one end of the substrate 2. When there are only two main heat detection elements 30A, the estimation result of the fire occurrence direction D1 is, for example, two choices of "north" or "south" direction (or two choices of "east" or "west" direction. ) Can be.

The detector 1 of the basic example may be a fire alarm that outputs a sound such as an alarm sound when a fire occurs. That is, the sensor 1 may further include a speaker that outputs a sound such as an alarm sound, an acoustic circuit, and the like. Further, the detector 1 may be a battery-powered fire alarm. That is, the sensor 1 may have a battery, a storage space for accommodating the battery, and the like. Further, the sensor 1 may be provided with an operation unit that receives the stop of the alarm sound and the operation test from the user, and the operation unit may be exposed on the outer surface 53 of the front cover 51.

In the basic example, all the heat detection elements 30 are mounted on the second surface 22 (upper surface) of the substrate 2. However, at least one of the plurality of heat detection elements 30 may be mounted on the first surface 21 (lower surface) of the substrate 2. In particular, when the detector 1 is a composite fire detector further provided with a smoke detection unit, there is a high possibility that the smoke detection unit will be arranged on the upper side of the second surface 22 of the substrate 2. In this case, a plurality of heat detection elements 30 may be mounted on the first surface 21 (lower surface) of the substrate 2.

In the basic example, the estimation unit E1 is provided in each sensor 1. However, the estimation unit E1 may be provided in the receiver Y1 (reception terminal). The estimation unit E1 estimates the fire occurrence direction D1 based on the detection results received from one or more detectors 1. In this case, the configuration of the sensor 1 can be simplified as compared with the case where the estimation unit E1 is provided in each sensor 1.

In the basic example, the specific unit E2 is provided in the receiver Y1. However, the specific unit E2 may be provided in the sensor 1. The specific unit E2 is provided in a specific sensor 1 (for example, a master unit) that manages a plurality of detectors 1 (slave units), and the specific unit E2 of the master unit receives estimation information from the plurality of slave units. Specific information may be generated and transmitted to the receiver Y1.

The estimation unit E1 in the basic example estimates the fire occurrence direction D1 based on the detection result and information on the installation environment in which one or more detectors 1 are installed (hereinafter referred to as "environmental information"). May be configured in. That is, the estimation unit E1 may estimate the fire occurrence direction D1 based on the environmental information in addition to the temperature values (detection values) of the plurality of heat detection elements 30.

The "environmental information" here means, for example, that the sensor 1 is installed in which area (meeting room, etc.) on which floor, and further within that area, such as near a wall, near a window, near a pillar, or near a door. It may contain information about the installation location, such as being installed on the ceiling. Further, the "environmental information" may include information such as which of the plurality of heat detecting elements 30 the heat detecting element 30 faces the wall, the window, the pillar, or the door. The environmental information of each sensor 1 is registered in the receiver Y1 by the builder at the time of construction of the sensor 1, for example.

In the estimation process, each sensor 1 transmits the signal requested to the receiver Y1 and acquires the "environmental information" of the own machine from the receiver Y1. The environmental information may be registered in the memory of the control unit 9 of each sensor 1 at the time of construction. If there are walls, windows, pillars, doors, etc. around the detector 1, such presence may be affected by the direction of hot air flow. The estimation unit E1 estimates the fire occurrence direction D1 after weighting the temperature value of each heat detection element 30, for example, in consideration of the environmental information. As a result, the reliability of the estimation result regarding the fire occurrence direction D1 can be further improved. It should be noted that the consideration of the environmental information may also be applied to the position specifying process executed by the specific unit E2 of the receiver Y1.

(4) Summary As described above, the sensor (1) according to the first aspect includes a plurality of heat detection elements (30) and a determination unit (91). The determination unit (91) determines the occurrence of a fire by comparing a plurality of detection values relating to heat detected by the plurality of heat detection elements (30) with predetermined determination conditions. According to the first aspect, it is possible to realize a comprehensive fire determination using a plurality of detection values detected by the plurality of heat detection elements (30). Therefore, it is possible to reduce the possibility that the reliability of the fire determination varies depending on the positional relationship between the place where the fire has occurred and the place where the detector (1) is arranged. As a result, it is possible to improve the reliability of fire determination.

The sensor (1) according to the second aspect further includes a housing (5) for accommodating a plurality of heat detection elements (30) in the first aspect. The plurality of heat detection elements (30) are arranged in the peripheral region (50) surrounding the center of the housing (5) when viewed along the direction intersecting the installation surface (X11) where the sensor (1) is installed. Will be done. According to the second aspect, the reliability regarding fire determination is further improved as compared with the case where, for example, a plurality of heat detecting elements (30) are collectively arranged in the center of the housing (5).

The sensor (1) according to the third aspect further comprises one substrate (2) in the first or second aspect. The plurality of heat detection elements (30) are mounted on one substrate (2). According to the third aspect, it is possible to suppress an increase in the number of parts as compared with the case where, for example, a plurality of heat detection elements (30) are dispersedly mounted on a plurality of substrates. Further, it is possible to suppress variations in the arrangement of the plurality of heat detection elements (30).

With respect to the sensor (1) according to the fourth aspect, in any one of the first to third aspects, the predetermined determination condition includes selecting the maximum value from a plurality of detected values. The determination unit (91) determines whether or not a fire has occurred, based on at least the maximum value. According to the fourth aspect, for example, by comparing with the same threshold value, the time until the determination unit (91) determines that a fire has occurred is shortened as compared with the case where the determination is based on the minimum value. It becomes easier (improvement of responsiveness regarding fire judgment).

With respect to the sensor (1) according to the fifth aspect, in any one of the first to fourth aspects, the predetermined determination condition includes selecting the minimum value from a plurality of detected values. The determination unit (91) determines whether or not a fire has occurred, based on at least the minimum value. According to the fifth aspect, for example, by comparing with the same threshold value, it is possible to reduce the possibility that the determination unit (91) mistakenly determines that a fire has occurred, as compared with the case where the determination is based on the maximum value. (Reduction of false alarms).

With respect to the sensor (1) according to the sixth aspect, in any one of the first to fifth aspects, the predetermined determination condition includes obtaining the following number. That is, the predetermined determination condition is to obtain the number of heat detection elements (30) that have detected a detection value exceeding the threshold value for fire determination among the plurality of heat detection elements (30) that have detected a plurality of detection values. include. The determination unit (91) determines whether or not a fire has occurred, based on at least the number of heat detection elements (30). According to the sixth aspect, the possibility that the determination unit (91) erroneously determines that a fire has occurred can be reduced (reduction of false alarms).

With respect to the sensor (1) according to the seventh aspect, in any one of the first to sixth aspects, the predetermined determination condition includes obtaining the average value of a plurality of detected values. The determination unit (91) determines whether or not a fire has occurred, at least based on the average value. According to the seventh aspect, the reliability regarding the fire determination is further improved.

Regarding the detector (1) according to the eighth aspect, in any one of the first to seventh aspects, the predetermined determination condition is a plurality of detections acquired from the plurality of heat detection elements (30) at the same timing. Includes using values. According to the eighth aspect, the responsiveness regarding the fire determination can be enhanced as compared with the case where a plurality of detection values acquired within a predetermined period are used, for example.

Regarding the sensor (1) according to the ninth aspect, in any one of the first to eighth aspects, the predetermined determination condition specifies outliers from a plurality of detected values, and the plurality of detected values are set. It includes using the detected values excluding outliers. According to the ninth aspect, when a comprehensive fire determination using a plurality of detection values detected by the plurality of heat detection elements (30) is realized, erroneous determination due to the influence of outliers can be further reduced.

The sensor (1) according to the tenth aspect performs a diagnosis regarding the occurrence of an internal event in the sensor (1) itself based on a plurality of detected values in any one of the first to ninth aspects. A diagnostic unit (92) is further provided. According to the tenth aspect, the reliability of the fire determination is further improved by diagnosing the occurrence of internal events (aging deterioration, dirt, failure, disconnection, etc.) that may affect the fire determination.

The disaster prevention system (100) according to the eleventh aspect communicates the detector (1) in any one of the first to tenth embodiments with one or more detectors (1) and one or more detectors (1) to generate a fire. It is provided with a receiving terminal (receiver Y1) for receiving a notification regarding the occurrence of the above. According to the eleventh aspect, it is possible to provide a disaster prevention system (100) capable of improving reliability regarding fire determination.

The fire determination method according to the twelfth aspect includes an acquisition step and a determination step. In the acquisition step, a plurality of detection values relating to the heat detected by the plurality of heat detection elements (30) of the sensor (1) are acquired. In the determination step, the occurrence of a fire is determined by comparing the acquired plurality of detected values with predetermined determination conditions. According to the twelfth aspect, it is possible to provide a disaster determination method capable of improving the reliability of fire determination.

The program according to the thirteenth aspect is a program for causing one or more processors to execute the fire determination method in the twelfth aspect. According to the thirteenth aspect, it is possible to provide a function capable of improving reliability regarding fire determination.

The configurations according to the second to eleventh aspects are not essential configurations for the sensor (1) and can be omitted as appropriate.

100 Disaster prevention system 1 Sensor 2 Board 30 Heat detection element 5 Housing 50 Peripheral area 91 Judgment unit 92 Diagnosis unit Y1 Receiver (receiver terminal)
X11 installation surface

Claims (13)

With multiple heat detectors
A determination unit for determining the occurrence of a fire by comparing a plurality of detection values related to heat detected by the plurality of heat detection elements with predetermined determination conditions.
To prepare
sensor. Further provided with a housing for accommodating the plurality of heat detection elements,
The plurality of heat detection elements are arranged in a peripheral region surrounding the center of the housing when viewed along a direction intersecting the installation surface on which the sensor is installed.
The detector according to claim 1. With one more board,
The plurality of heat detection elements are mounted on the one substrate.
The detector according to claim 1 or 2. The predetermined determination condition includes selecting the maximum value from the plurality of detected values.
The determination unit determines whether or not a fire has occurred, at least based on the maximum value.
The detector according to any one of claims 1 to 3. The predetermined determination condition includes selecting the minimum value from the plurality of detected values.
The determination unit determines whether or not a fire has occurred, at least based on the minimum value.
The detector according to any one of claims 1 to 4. The predetermined determination condition includes obtaining the number of heat detection elements that have detected a detection value exceeding a threshold value for fire determination among the plurality of heat detection elements that have detected the plurality of detection values.
The determination unit determines whether or not a fire has occurred, at least based on the number of the heat detection elements.
The detector according to any one of claims 1 to 5. The predetermined determination condition includes obtaining an average value of the plurality of detected values.
The determination unit determines whether or not a fire has occurred, at least based on the average value.
The detector according to any one of claims 1 to 6. The predetermined determination condition includes using the plurality of detection values acquired from the plurality of heat detection elements at the same timing.
The detector according to any one of claims 1 to 7. The predetermined determination condition includes specifying outliers from the plurality of detected values and using the detected values excluding the outliers from the plurality of detected values.
The detector according to any one of claims 1 to 8. A diagnostic unit for diagnosing the occurrence of an internal event in the sensor itself based on the plurality of detected values is further provided.
The detector according to any one of claims 1 to 9. The number of detectors according to any one of claims 1 to 10 is 1 or more.
A receiving terminal that communicates with one or more of the above detectors and receives a notification regarding the occurrence of a fire.
To prepare
Disaster prevention system. An acquisition step for acquiring multiple detection values for heat detected in each of the plurality of heat detection elements of the sensor, and
A determination step for determining the occurrence of a fire by comparing the acquired plurality of detection values with predetermined determination conditions, and
including,
Fire judgment method. A program for causing one or more processors to execute the fire determination method according to claim 12.

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