WO2022210258A1 - Détecteur de fumée - Google Patents

Détecteur de fumée Download PDF

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Publication number
WO2022210258A1
WO2022210258A1 PCT/JP2022/013946 JP2022013946W WO2022210258A1 WO 2022210258 A1 WO2022210258 A1 WO 2022210258A1 JP 2022013946 W JP2022013946 W JP 2022013946W WO 2022210258 A1 WO2022210258 A1 WO 2022210258A1
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WIPO (PCT)
Prior art keywords
light
smoke
light intensity
measuring means
intensity measuring
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PCT/JP2022/013946
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English (en)
Japanese (ja)
Inventor
健一 加藤
義裕 熊倉
啓 磯貝
Original Assignee
能美防災株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 能美防災株式会社 filed Critical 能美防災株式会社
Priority to CN202280024634.3A priority Critical patent/CN117480536A/zh
Priority to JP2023511119A priority patent/JPWO2022210258A1/ja
Publication of WO2022210258A1 publication Critical patent/WO2022210258A1/fr

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke

Definitions

  • the present invention relates to technology for sensing smoke.
  • smoke detectors that detect the generation of smoke in an external space by detecting particles contained in the air that flows into the sensing area from the external space.
  • a smoke detector called a photoelectric smoke detector emits light from a light-emitting element into a sensing area, and the reflected light is received by a light-receiving element that is reflected by particles in the air within the sensing area. Based on the measured light intensity, smoke generation in the exterior space is sensed.
  • Patent Document 1 discloses a technique related to a total scattered light type photoelectric smoke sensor.
  • Patent Document 2 discloses a technology related to a particle counter type photoelectric smoke sensor.
  • a total scattered light type photoelectric smoke sensor smoke is not detected until the concentration of smoke in the sensing area increases and the intensity of light received by the light receiving element reaches a predetermined threshold.
  • smoke is detected until the concentration of smoke in the sensing area increases and the number of smoke particles passing through a predetermined position in the sensing area reaches a predetermined threshold. not. Therefore, in any type of photoelectric smoke sensor, a certain amount of time is required from generation of smoke to detection of smoke.
  • the present invention provides a smoke sensor that can detect smoke more quickly than conventional smoke sensors.
  • the present invention a first light intensity measuring means for measuring the intensity of a collection of light reflected by a group of particles contained in air flowing from an external space into a predetermined area within the sensing area; second light intensity measuring means for measuring the intensity of light reflected by the particle, the measured value of the first light intensity measuring means and the measurement of the second light intensity measuring means for each of the individual particles and determining means for determining the presence or absence of smoke in the exterior space based on the values.
  • the presence or absence of smoke is determined by both the intensity of reflected light generated by individual smoke and the intensity of scattered light generated by smoke particle groups. is sensed.
  • the figure which showed the structure of the smoke sensing system which concerns on one Embodiment The figure which showed typically the structure of the smoke sensor which concerns on one Embodiment.
  • the figure which showed the functional structure of the control unit which concerns on one Embodiment. 4 is a graph showing changes over time in the amplitude of light intensity signals output from two light receiving units included in the smoke sensor according to one embodiment.
  • FIG. 7 is a graph showing how the shape of a pulse indicated by a light intensity signal output from a light receiving unit according to a modified example changes depending on the particle size.
  • FIG. 1 is a diagram showing the configuration of a smoke sensing system 1. As shown in FIG. A smoke sensing system 1 includes a smoke sensor 11 and a host system 12 .
  • the smoke detector 11 is placed in a space to be monitored for smoke generation (hereinafter referred to as a “monitored space”), takes in air in the monitored space, and detects smoke if the taken-in air contains smoke. , is a device that notifies the host system 12 of the occurrence of smoke when smoke is detected.
  • the number of smoke sensors 11 provided in the smoke detection system 1 is one, but the number of smoke sensors 11 provided in the smoke detection system 1 varies according to the number and size of the monitored spaces.
  • the host system 12 may be a monitoring terminal device, a smoke alarm panel, a central monitoring system, or the like.
  • the host system 12 and the smoke sensor 11 are capable of data communication with each other via a wired, wireless, or mixed communication medium.
  • the host system 12 is the same as the host system according to the prior art, so its description is omitted.
  • FIG. 2 is a diagram schematically showing the configuration of the smoke sensor 11.
  • Smoke sensor 11 includes housing 110 , light emitting section 111 , lens 112 , light receiving section 113 , light receiving section 114 , lens 115 , fan 116 , filter 117 and control unit 118 .
  • the housing 110 is a container that forms a space inside.
  • the housing 110 has an intake port P that is an opening that functions as an inlet for air to flow from the external space to the internal space, and an exhaust port that is an opening that functions as an outlet for air to flow from the internal space to the external space. have Q.
  • the housing 110 includes a wall 1101 for forming a sensing area S, which is an area for sensing smoke, in the interior space, and a pipe forming an air flow path from the intake port P to the sensing area S. 1102 and a tube 1103 forming an air flow path from the sensing region S to the exhaust port Q.
  • a sensing area S which is an area for sensing smoke
  • the housing 110 includes a wall 1101 for forming a sensing area S, which is an area for sensing smoke, in the interior space, and a pipe forming an air flow path from the intake port P to the sensing area S. 1102 and a tube 1103 forming an air flow path from the sensing region S to the exhaust port Q.
  • the light-emitting part 111 (an example of light-emitting means) has, for example, an LED (an example of a light-emitting element), and emits light from the air inlet P toward the air outlet Q.
  • the lens 112 has the role of condensing the light emitted by the light emitting section 111 and guiding the condensed light to the position B within the sensing area S.
  • the light-receiving unit 113 (an example of first light intensity measuring means) has, for example, a photodiode (an example of a light-receiving element), and the light emitted from the light-emitting unit 111 is transmitted from the external space to the area A within the sensing area S. Part of scattered light, which is a collection of reflected light reflected by a group of particles contained in the flowing air, is received, and a light intensity signal indicating the intensity of the received light is output to the control unit 118 .
  • the light receiving section 113 is arranged at a position not facing the light emitting section 111 so that the light emitted by the light emitting section 111 does not directly enter the light receiving section 113 .
  • the light receiving section 114 (an example of the second light intensity measuring means) has, for example, a photodiode (an example of a light receiving element), and the light emitted from the light emitting section 111 flows from the external space to the position B within the sensing region S. For each individual particle passing through, it receives a portion of the reflected light reflected by that particle and outputs a light intensity signal to control unit 118 indicative of the intensity of the received light.
  • the light receiving section 114 is arranged at a position not facing the light emitting section 111 so that the light emitted by the light emitting section 111 does not directly enter the light receiving section 114 .
  • the lens 115 is a lens that condenses light traveling from the position B toward the light receiving section 114 . That is, the focal point of lens 115 is position B. FIG. Through the lens 115, the light-receiving part 114 is centered on the position B, and the reflected light reflected by the smoke particles is within an area which is so narrow that two or more smoke particles cannot enter at the same time, and which can be regarded as a point. can be captured.
  • the fan 116 generates a flow of air from the external space through the intake port P into the sensing region S and out through the exhaust port Q to the external space by rotating blades.
  • the filter 117 is arranged on the air flow path from the intake port P to the exhaust port Q, traps dust contained in the air flowing into the sensing area S from the external space, and prevents dust from entering the sensing area S.
  • the control unit 118 is a device that controls the operation of the smoke sensor 11, etc.
  • the hardware of the control unit 118 is, for example, a computer, and the control unit 118 is realized by the computer performing processing according to the program for the control unit 118 .
  • FIG. 3 is a diagram showing the configuration of the computer 10 employed as hardware for the control unit 118.
  • the computer 10 includes a processor 101 that performs various data processing, a memory 102 that stores various data, an input/output interface 103 that exchanges signals with components such as the light emitting unit 111 included in the smoke sensor 11, and an external device. (In this case, the host system 12) is provided with a communication interface 104 for transmitting and receiving data.
  • FIG. 4 is a diagram showing the functional configuration of the control unit 118. As shown in FIG. That is, the computer 10 performs processing according to the program for the control unit 118, thereby realizing the control unit 118 having the components shown in FIG. The functional components included in the control unit 118 will be described below.
  • the light emission instruction means 1181 instructs the light emission section 111 to emit light.
  • a light intensity signal acquisition unit 1182 acquires a light intensity signal output from the light receiving unit 113 .
  • a light intensity signal acquisition unit 1183 acquires a light intensity signal output from the light receiving unit 114 .
  • the clock means 1184 continuously measures the current time based on, for example, a clock signal generated by a clock provided in the processor 101, and generates a time signal indicating the current time.
  • Counting means 1185 (constituting grain number measuring means together with light receiving section 114 and light intensity signal acquiring means 1183) is based on the light intensity signal acquired by light intensity signal acquiring means 1183 from light receiving section 114, within the most recent predetermined time The number of particles passing through position B (hereinafter referred to as "the number of particles") is counted.
  • the counting means 1185 uses the time signal generated by the clocking means 1184 to specify the most recent predetermined time for which the number of grains is to be counted.
  • the determining means 1186 determines the presence or absence of smoke in the external space based on the light intensity indicated by the light intensity signal acquired by the light intensity signal acquiring means 1182 and the number of particles counted by the counting means 1185 . The procedure by which the determination means 1186 determines the presence or absence of smoke will be described later.
  • the communication means 1187 transmits smoke generation notification data for notifying the generation of smoke to the host system 12 .
  • FIG. 5 shows changes over time in the amplitude of the light intensity signal acquired by the light intensity signal acquisition means 1182 from the light receiving unit 113 when air containing smoke begins to flow from the external space into the sensing region S (FIG. 5(a)). , and changes over time in the amplitude of the light intensity signal acquired from the light receiving unit 114 by the light intensity signal acquisition means 1183 (FIG. 5(b)).
  • the light intensity signal acquired by the light intensity signal acquiring means 1182 from the light receiving unit 113 is the reflected light reaching the light receiving unit 113 among the reflected lights reflected by a plurality of particles (particle groups) in the area A having a certain extent. Indicates the intensity of the total light. Therefore, the amplitude of the light intensity signal acquired by the light intensity signal acquiring means 1182 from the light receiving section 113 continuously changes as the concentration of smoke in the sensing region S changes.
  • the light intensity signal acquired from the light receiving unit 114 by the light intensity signal acquisition means 1183 is the light intensity signal reflected by the particles passing through a very narrow area centered on the position B, which can be substantially regarded as a point.
  • the intensity of the reflected light reaching the light receiving section 114 is shown. Therefore, the light intensity signal obtained by the light intensity signal obtaining means 1183 from the light receiving section 114 is a pulse signal that rises at the moment the particle passes the position B.
  • the concentration of smoke in the sensing region S changes, the frequency of occurrence of these pulse signals, that is, the number of occurrences per predetermined time period, changes.
  • the counting means 1185 counts the number of pulse signals indicated by the light intensity signal acquired by the light intensity signal acquiring means 1183 from the light receiving section 114 .
  • FIG. 6 is a diagram illustrating the flow of processing performed by the determination means 1186.
  • the determination means 1186 performs the processing according to the flow shown in FIG. 6 each time a sufficiently short predetermined time elapses. The processing performed by the determination means 1186 will be described below.
  • the determination means 1186 first determines whether or not the light intensity signal acquired by the light intensity signal acquisition means 1182 from the light receiving unit 113 reaches a predetermined threshold value Z (step S101).
  • step S101 when the light intensity signal acquisition unit 1182 determines that the light intensity signal acquired from the light receiving unit 113 has not reached the threshold value Z (step S101; No), the determination unit 1186 makes a determination in step S104.
  • a predetermined value X is set as the threshold value T to be used (step S102).
  • step S101 when the light intensity signal acquisition unit 1182 determines that the light intensity signal acquired from the light receiving unit 113 has reached the threshold value Z (step S101; Yes), the determination unit 1186 performs A predetermined value Y smaller than the value X is set as the threshold value T used in the determination (step S103).
  • the determination means 1186 determines whether or not the number of grains counted by the counting means 1185 has reached the threshold value T set in step S102 or S103 (step S104 ).
  • step S104 when it is determined that the number of grains counted by the counting means 1185 has reached the threshold value T (step S104; Yes), the determining means 1186 determines that smoke is generated in the external space, and communicates.
  • the means 1187 is instructed to transmit smoke generation notification data (step S105).
  • the communication means 1187 transmits smoke occurrence notification data to the host system 12 according to the instruction of the determination means 1186 . After that, the determination means 1186 terminates the series of processes shown in FIG.
  • step S104 when it is determined in step S104 that the number of grains counted by the counting means 1185 has not reached the threshold value T (step S104; No), the determination means 1186 determines that smoke is not generated in the external space. , the series of processes shown in FIG.
  • the determination means 1186 determines whether or not the number of particles passing through the position B within the most recent predetermined time period counted by the counting means 1185 has reached the threshold value T. , to determine the presence or absence of smoke in the exterior space. Then, when the light intensity signal received by the light intensity signal acquiring means 1182 from the light receiving section 113 reaches a predetermined threshold value Z, the determination means 1186 sets the threshold value T to a value Y smaller than the value X normally used. change. As a result, smoke is sensed more quickly than if such a change in threshold T were not made.
  • the determining means 1186 determines the condition for determining the presence or absence of smoke based on the number of particles counted by the counting means 1185 (that is, the condition for determining the presence or absence of smoke by the particle number measuring means).
  • the means 1182 changes based on the light intensity signal acquired from the light receiving section 113 (that is, the measured value of the light intensity measuring means).
  • the determination means 1186 determines the presence or absence of smoke based on the light intensity signal acquired by the light intensity signal acquisition means 1182 from the light receiving unit 113, and the determination condition (that is, the smoke determination condition by the light intensity measurement means ) is changed based on the number of grains counted by the counting means 1185 (that is, the measured value of the grain number measuring means).
  • FIG. 7 is a diagram illustrating the flow of processing performed by the determination means 1186 in one example of this modification.
  • the determination means 1186 performs the processing according to the flow shown in FIG. 7 every time a sufficiently short predetermined time elapses. Processing performed by the determination means 1186 shown in FIG. 7 will be described below.
  • the determination means 1186 first determines whether or not the number of grains counted by the counting means 1185 has reached a predetermined threshold value Y (step S201).
  • step S201 when it is determined that the number of grains counted by the counting means 1185 has not reached the threshold value Y (step S201; No), the determination means 1186 sets the threshold value T used in the determination in step S204 to a predetermined value W is set (step S202).
  • step S201 when it is determined in step S201 that the number of grains counted by the counting means 1185 has reached the predetermined threshold value Y (step S201; Yes), the determination means 1186 sets the threshold value T used in the determination in step S204 to , a predetermined value Z smaller than the value W is set (step S203).
  • the determination unit 1186 determines whether the light intensity signal acquired by the light intensity signal acquisition unit 1182 from the light receiving unit 113 reaches the threshold value T set in step S202 or S203. It is determined whether or not (step S204).
  • step S204 when the light intensity signal acquisition unit 1182 determines that the light intensity signal acquired from the light receiving unit 113 has reached the threshold value T (step S204; Yes), the determination unit 1186 determines that smoke is generated in the external space. Then, the communication means 1187 is instructed to transmit smoke generation notification data (step S205). The communication means 1187 transmits smoke occurrence notification data to the host system 12 according to the instruction of the determination means 1186 . After that, the determination means 1186 terminates the series of processes shown in FIG.
  • step S204 when the light intensity signal acquisition unit 1182 determines that the light intensity signal acquired from the light receiving unit 113 has not reached the threshold value T (step S204; No), the determination unit 1186 detects smoke in the external space. 7 is terminated without instructing the communication means 1187 to transmit smoke generation notification data.
  • the determination means 1186 determines whether or not the intensity of the scattered light generated by the particle group in the region A has reached the threshold value T, indicated by the light intensity signal acquired by the light intensity signal acquisition means 1182. Determine the presence or absence of smoke in the external space according to Then, when the number of grains counted by the counting means 1185 reaches a predetermined threshold value Y, the determination means 1186 changes the threshold value T to a value Z smaller than the value W normally used. As a result, smoke is sensed more quickly than if such a change in threshold T were not made.
  • the smoke sensor 11 it is possible to determine the presence or absence of smoke with a particle size that cannot be measured by the particle number measuring means in the external space.
  • the condition for judging the presence or absence of smoke by the particle number measuring means is whether or not the number of particles reaches a predetermined threshold.
  • the determination condition is not limited to this.
  • a determination condition may be adopted in which it is determined that smoke is generated when the number of particles reaches a predetermined threshold and continues for a predetermined length of time or longer.
  • the determination means 1186 may change the threshold value for the duration based on the measurement value of the light intensity measurement means, in addition to or instead of the threshold value for the number of grains included in the determination condition.
  • the determination means 1186 determines that the number of grains counted by the counting means 1185 has reached the threshold value X. It is determined that smoke is generated when the presence time continues for a threshold value T1 or more.
  • the determination means 1186 determines that the number of grains counted by the counting means 1185 has reached the threshold value X. It is determined that smoke is generated when the presence time continues at or above a threshold value T2, which is smaller than the threshold value T1.
  • the condition for determining the presence or absence of smoke by the light intensity measuring means is whether or not the light intensity has reached a predetermined threshold value.
  • the determination condition for the presence or absence of smoke is not limited to this.
  • a determination condition may be adopted in which it is determined that smoke is generated when the light intensity reaches a predetermined threshold and continues for a predetermined length of time or longer.
  • the determining means 1186 may change the threshold for the duration based on the measurement value of the particle number measuring means, in addition to or instead of changing the threshold for the light intensity included in the determination conditions.
  • the determination means 1186 determines that the light intensity signal acquired by the light intensity signal acquisition means 1182 from the light receiving unit 113 has reached the threshold value W. It is determined that smoke is generated when the presence time continues for a threshold value T1 or more.
  • the determining means 1186 determines that the light intensity signal acquired by the light intensity signal acquiring means 1182 from the light receiving section 113 reaches the threshold value W. It is determined that smoke is generated when the presence time continues at or above a threshold value T2, which is smaller than the threshold value T1.
  • FIG. 3 The shape of the pulse indicated by the light intensity signal acquired from the light receiving unit 114 by the light intensity signal acquisition means 1183 changes depending on the particle diameter of the particles passing through the position B.
  • FIG. 8 is a graph showing how the shape of the pulse indicated by the light intensity signal acquired by the light intensity signal acquiring means 1183 from the light receiving section 114 changes depending on the particle size.
  • FIG. 8(a) is a graph showing the change over time of the light intensity signal when a particle having a larger particle size than that in FIG. 8(b) passes through position B
  • FIG. ) is a graph showing the change over time of the light intensity signal when a particle having a smaller particle size than ) passes through position B
  • FIG. 8(a) and 8(b) are graphs when the flow velocity (flow rate per unit time) of the air flowing through the sensing region S is the same.
  • the larger the particle size of the particles passing through position B the larger the width of the pulse appearing in the light intensity signal in the time axis direction. Also, generally, the larger the particle size of the particles passing through the position B, the larger the amplitude of the pulse appearing in the light intensity signal.
  • the particle size of the particles contained in the air flowing into the sensing region S from the external space that is, the particle size of the smoke can be specified. .
  • the smoke sensor 11 may be configured to determine whether or not smoke is generated in the external space based on the size of the smoke identified based on the amplitude.
  • FIG. 9 is a diagram showing the functional configuration of the control unit 118 included in the smoke sensor 11 according to this modification. Some of the components shown in FIG. 9 are common to those of the control unit 118 according to the embodiment shown in FIG. The same reference numerals as those used in FIG. 4 are used for those components. Among the components shown in FIG. 9, components different from the components shown in FIG. 4 will be described below.
  • the particle size calculation means 1188 calculates the particle size of particles passing through position B. Specifically, the particle diameter calculation means 1188 detects the width (or amplitude) of the pulse wave appearing in the temporal change of the light intensity signal that the light intensity signal acquisition means 1183 acquires from the light receiving section 114 in the direction of the time axis. The particle size of the particles passing through the position B is calculated by multiplying by the flow velocity of the air flowing through S (flow rate per unit time). Alternatively, for example, the particle size calculation means 1188 may use a correspondence table showing particle sizes according to the width (or amplitude) of the pulse wave in the time axis direction, or the width (or amplitude) of the pulse wave in the time axis direction.
  • the particle size of the particle passing through the position B may be specified according to a calculation formula for calculating the particle size.
  • the particle size calculation means 1188 constitutes a particle size measurement means for measuring the particle size of particles contained in the air flowing into the sensing region S from the external space together with the light receiving section 114 and the light intensity signal acquisition means 1183 .
  • the smoke sensor 11 is configured to have a flow meter for measuring the flow velocity, and the particle size calculation means 1188 measures the width of the pulse wave in the time axis direction.
  • the particle size may be calculated by multiplying the flow velocity obtained as the measurement result of the flow meter.
  • the determining means 1189 determines the particle size calculated by the particle size calculating means 1188 (that is, the measured value of the particle size measuring means) and the light intensity indicated by the light intensity signal obtained by the light intensity signal obtaining means 1182 from the light receiving section 113 ( That is, it is determined whether or not smoke is generated in the external space based on the measured value of the light intensity measuring means).
  • the determination means 1189 determines the particle diameter calculated by the particle diameter calculation means 1188 and the light intensity signal acquisition means 1182 according to the correspondence table showing the density of the smoke according to the combination of the particle diameter and the light intensity. and smoke density according to the intensity of light indicated by the light intensity signal obtained from .
  • the determining means 1189 may calculate the smoke density according to a formula for calculating the smoke density using the particle diameter and the light intensity as variables.
  • the determination means 1189 determines that smoke is generated in the external space when the concentration of smoke specified as described above reaches a predetermined threshold.
  • the determination condition used by the determining means 1189 to determine the presence or absence of smoke is not limited to this. For example, even if a determination condition is employed to determine that smoke is generated in the external space when the concentration of smoke specified by the determining means 1189 reaches a predetermined threshold value and continues for a predetermined time or longer. good.
  • the determining means 1189 does not necessarily have to specify the concentration of smoke. For example, instead of comparing the concentration of smoke with a threshold value, the determination unit 1189 compares the light intensity indicated by the light intensity signal acquired from the light receiving unit 113 by the light intensity signal acquisition unit 1182 with the threshold value, thereby determining the presence or absence of smoke. is determined, and the light intensity indicated by the light intensity signal acquired from the light receiving unit 113 or the light intensity threshold used for determining the presence or absence of smoke is determined according to the particle size calculated by the particle size calculation means 1188. may be adjusted.
  • the determination unit 1189 multiplies the light intensity indicated by the light intensity signal acquired from the light receiving unit 113 by a larger multiplier to correct the measurement value of the light receiving unit 113 as the specified particle size is smaller.
  • the determining means 1189 compares the measured value of the light intensity thus corrected with a threshold value to determine whether or not smoke is generated.
  • the determining means 1189 corrects the threshold by multiplying the threshold of the light intensity used for determining the presence or absence of smoke by a smaller multiplier as the specified particle diameter is smaller.
  • the determining means 1189 compares the light intensity threshold thus corrected with the light intensity indicated by the light intensity signal acquired from the light receiving unit 113 to determine whether or not smoke is generated.
  • the particle size calculated by the particle size calculation means 1188 is used to adjust the measured value of the light receiving unit 113 or the threshold value compared with the measured value of the light receiving unit 113 . Therefore, the particle size calculated by the particle size calculating means 1188 may be an index value indicating the size of the particle diameter, and does not necessarily have to be a numerical value representing the particle diameter in terms of its length ( ⁇ m). Therefore, for example, the width of the pulse wave in the direction of the time axis may be used as it is as a value indicating the particle size. Alternatively, the amplitude of the pulse wave may be used as it is as a value indicating the particle size.
  • the communication means 1190 transmits particle size notification data for notifying the particle size calculated by the particle size calculation means 1188 to the host system 12 together with smoke detection notification data.
  • the particle size indicated by the particle size notification data is information indicating the type of smoke (black smoke, white smoke, etc.).
  • the particle size obtained can be used, for example, to identify the source of a fire or to identify an appropriate extinguishing method.
  • the scattered light which is a collection of reflected light reflected by the particle group in the area A received by the light receiving unit 113, and the reflected light reflected by the particles passing through the position B received by the light receiving unit 114 are These are lights emitted from the same light emitting unit 111 .
  • a configuration may be adopted in which the light-emitting source for the light received by the light-receiving unit 113 and the light-emitting source for the light received by the light receiving unit 114 are different.
  • FIG. 10 is a diagram schematically showing an example configuration of the smoke sensor 11 according to such a modification.
  • the smoke sensor 11 shown in FIG. 10 includes a light emitting portion 111(1) and a light emitting portion 111(2).
  • the light emitting unit 111(1) emits light toward the area A.
  • the light-receiving unit 113 receives part of the scattered light, which is a collection of reflected light emitted from the light-emitting unit 111 ( 1 ) and reflected by the particle group in the region A.
  • FIG. 1 is a collection of reflected light emitted from the light-emitting unit 111 ( 1 ) and reflected by the particle group in the region A.
  • the light emitting unit 111 (2) emits light toward a position B within a region other than the region A.
  • the light receiving unit 114 receives part of the reflected light emitted from the light emitting unit 111(2) and reflected by the particles passing through the position B.
  • the smoke sensor 11 according to the above-described embodiment requires a smaller number of light emitting units than the smoke sensor 11 according to this modified example, and is therefore desirable in terms of miniaturization and cost reduction.
  • the sensing area S including the area A generating the scattered light received by the light receiving section 113 and the sensing area S including the position B generating the reflected light received by the light receiving section 114 are the same area.
  • area A and location B may be configured to be included in different sensing areas.
  • FIG. 11 is a diagram schematically showing an example configuration of the smoke sensor 11 according to such a modification.
  • a housing 110 of the smoke sensor 11 shown in FIG. 11 forms therein different sensing areas, a sensing area S11 and a sensing area S12.
  • the different sensing regions mean regions that are divided so that light emitted in one region does not substantially reach the other region, and do not necessarily have to be completely separated regions.
  • Sensing area S11 includes area A and sensing area S12 includes location B.
  • the light emitting unit 111 included in the smoke sensor 11 shown in FIG. 11 is arranged on the boundary between the sensing area S11 and the sensing area S12, and irradiates both the sensing area S11 and the sensing area S12 with light.
  • the light emitting unit 111 may be composed of two different light emitting units respectively arranged in the sensing area S11 and the sensing area S12.
  • the smoke sensor 11 according to the above-described embodiment has the same sensing area including the area A and the sensing area including the position B, so that the size can be reduced. is desirable in terms of
  • the light receiving section 113 and the light receiving section 114 each include different light receiving elements (for example, photodiodes) and receive light individually.
  • the light receiving section 113 and the light receiving section 114 may be configured to measure the intensity of light using the same light receiving element.
  • FIG. 12 is a diagram schematically showing the configuration of the smoke sensor 11 according to this modification. Also, FIG. 13 is a diagram showing the functional configuration of the control unit 118 according to this modification.
  • the light receiving section 114 also serves as the light receiving section 113 .
  • the smoke sensor 11 includes a light emitting section 119 different from the light emitting section 111 in addition to the light emitting section 111 .
  • the light emitting unit 119 irradiates a wide area A, which is closer to the light receiving unit 114 than the position B, with light.
  • light emission instruction means 1191 gives light emission instructions to light emitting section 111 and light emitting section 119 so that they emit light in different periods.
  • the light emitting portion 111 and the light emitting portion 119 emit light with a time difference, and do not emit light at the same time.
  • the light receiving portion 114 when the light emitting portion 119 emits light plays the role of the light receiving portion 113 (an example of the first light receiving means) in the above-described embodiment, and the light receiving portion when the light emitting portion 111 emits light.
  • 114 plays a role of the light receiving section 114 (an example of the second light receiving means) in the embodiment described above.
  • the counting means 1185 and the determining means 1186 determine whether the light intensity signal received from the light receiving section 114 via the light intensity signal acquiring means 1183 indicates the light intensity when the light emitting section 111 or the light emitting section 119 emits light. determine.
  • the counting means 1185 counts the number of particles that have passed through the position B using the light intensity signal output by the light receiving section 114 while the light emitting section 111 is emitting light.
  • Judgment means 1186 judges the presence or absence of smoke based on the light intensity indicated by the light intensity signal output from light receiving part 114 when light emitting part 119 is emitting light and the number of particles counted by counting means 1185 .
  • the light emitting section 111 and the light emitting section 119 may be configured to emit light from the same light emitting element (such as an LED).
  • smoke sensor 11 instead of comprising light emitter 119 shown in FIG.
  • it may be configured to guide the light emitted from the light emitting section 111 to the area A.
  • the light emitting unit 111 with a mirror between the light emitting unit 111 and the lens 112 functions as the light emitting unit 119 in FIG.
  • control unit 118 may be configured as a dedicated device having an integrated circuit such as ASIC, FPGA, or the like.
  • DESCRIPTION OF SYMBOLS 1 Smoke detection system, 10... Computer, 11... Smoke sensor, 12... Host system, 101... Processor, 102... Memory, 103... Input/output interface, 104... Communication interface, 110... Housing, 111... Light-emitting part, DESCRIPTION OF SYMBOLS 112... Lens 113... Light-receiving part 114... Light-receiving part 115... Lens 116... Fan 117... Filter 118... Control unit 119... Light-emitting part 1101... Wall body 1102... Tube 1103...
  • Tube 1181 Light emission instruction means 1182 Light intensity signal acquisition means 1183 Light intensity signal acquisition means 1184 Timing means 1185 Count means 1186 Judgment means 1187 Communication means 1188 Particle diameter calculation means 1189 Judgment means 1190...Communication means 1191...Light emission instruction means.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

La présente invention concerne un détecteur de fumée qui peut détecter la fumée plus rapidement que les détecteurs de fumée existants. Ce détecteur de fumée (11) comprend une unité d'émission de lumière (111), une unité de réception de lumière (113), une unité de réception de lumière (114) et une unité de commande (118). L'unité de réception de lumière (113) reçoit une lumière diffusée qui a été émise par l'unité d'émission de lumière (111) et diffusée par un groupe de particules contenues dans l'air à l'intérieur d'une région A. L'unité de réception de lumière (114) reçoit une lumière réfléchie qui a été émise à partir de l'unité d'émission de lumière (111) et réfléchie par des particules qui traversent une position B. L'unité de commande (118) compte les ondes d'impulsion qui apparaissent à des changements dans le temps dans des signaux d'intensité lumineuse émis par l'unité de réception de lumière (114), et mesure ainsi le nombre de particules qui ont traversé la position B sur une période égale à la durée de temps prescrite la plus récente. L'unité de commande (118) mesure la présence de fumée dans un espace extérieur sur la base du nombre de particules mesurées de cette manière, et l'amplitude des signaux d'intensité lumineuse délivrés en sortie par l'unité de réception de lumière (113).
PCT/JP2022/013946 2021-03-31 2022-03-24 Détecteur de fumée WO2022210258A1 (fr)

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CN202280024634.3A CN117480536A (zh) 2021-03-31 2022-03-24 烟感知器
JP2023511119A JPWO2022210258A1 (fr) 2021-03-31 2022-03-24

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JP (1) JPWO2022210258A1 (fr)
CN (1) CN117480536A (fr)
TW (1) TW202303532A (fr)
WO (1) WO2022210258A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153550A (ja) * 1984-08-23 1986-03-17 Nohmi Bosai Kogyo Co Ltd 光電式煙感知器
JPH1123460A (ja) * 1997-06-30 1999-01-29 Hochiki Corp 煙感知装置
JP2010520997A (ja) * 2007-03-09 2010-06-17 エックストラリス・テクノロジーズ・リミテッド 粒子を検知する方法およびシステム
JP2013214330A (ja) * 2008-10-09 2013-10-17 Hochiki Corp 煙検出器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153550A (ja) * 1984-08-23 1986-03-17 Nohmi Bosai Kogyo Co Ltd 光電式煙感知器
JPH1123460A (ja) * 1997-06-30 1999-01-29 Hochiki Corp 煙感知装置
JP2010520997A (ja) * 2007-03-09 2010-06-17 エックストラリス・テクノロジーズ・リミテッド 粒子を検知する方法およびシステム
JP2013214330A (ja) * 2008-10-09 2013-10-17 Hochiki Corp 煙検出器

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CN117480536A (zh) 2024-01-30
TW202303532A (zh) 2023-01-16

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