WO2023157759A1 - Smoke detection device - Google Patents

Smoke detection device Download PDF

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Publication number
WO2023157759A1
WO2023157759A1 PCT/JP2023/004422 JP2023004422W WO2023157759A1 WO 2023157759 A1 WO2023157759 A1 WO 2023157759A1 JP 2023004422 W JP2023004422 W JP 2023004422W WO 2023157759 A1 WO2023157759 A1 WO 2023157759A1
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WO
WIPO (PCT)
Prior art keywords
light
detection device
smoke
container
smoke detection
Prior art date
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PCT/JP2023/004422
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French (fr)
Japanese (ja)
Inventor
智宏 星野
Original Assignee
能美防災株式会社
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Publication date
Application filed by 能美防災株式会社 filed Critical 能美防災株式会社
Priority to JP2024501340A priority Critical patent/JPWO2023157759A1/ja
Priority to CN202380019862.6A priority patent/CN118648041A/en
Publication of WO2023157759A1 publication Critical patent/WO2023157759A1/en

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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 a device for detecting smoke.
  • a smoke detection device that detects the generation of smoke in the monitored space by detecting the smoke contained in the monitored space.
  • a smoke detection device generally includes a sensor that detects smoke and a container that houses the sensor.
  • the container housing the sensor has an inlet, which is an opening through which air flows from the outside to the inside, which is a space to be monitored, and an outlet, which is an opening through which air flows out from the inside to the outside.
  • Patent Document 1 discloses a smoke detection device that includes a container having an air inlet and an air outlet, and a sensor for detecting smoke housed inside the container.
  • the air that flows into the container that houses the sensor of the smoke detection device contains dust that is about the same size as smoke particles or smaller. A part of the dust does not flow out from the outflow port to the outside, but adheres to the inner surface of the container and stains it. Contamination in the container reduces the smoke detection accuracy of the sensor.
  • the present invention provides a smoke detection device that is less susceptible to deterioration in smoke detection accuracy due to adherence of dirt, compared to conventional smoke detection devices.
  • the present invention provides a light emitting part, a light receiving part arranged so that the light receiving axis intersects with the light emitting axis of the light emitting part, and an airflow housing the light emitting part and the light receiving part.
  • a container having an inlet and an air outlet, an air blower for generating an air flow from the inlet into the container, and smoke in the air flowing through the container based on signals generated by the light receiving unit. wherein the inflow port and the outflow port are arranged on two surfaces of the wall of the container that face each other across a plane including the light emitting axis and the light receiving axis.
  • the inflow port and the outflow port is positioned outside a detection area where the light emitting area of the light emitting section and the light receiving area of the light receiving section overlap when viewed in the direction perpendicular to the plane. Suggest a device.
  • the peripheral portion of the inlet or outlet, to which dirt is likely to adhere is the area in which the smoke particles to be detected float in the container housing the light-emitting unit and the light-receiving unit. Since it is located outside the area, it is difficult for the accuracy of smoke detection to deteriorate due to adhesion of dirt.
  • FIG. 3 is a diagram schematically showing the configuration of a smoke detection device 9 according to conventional technology.
  • FIG. 3(A) is a view showing a main body 911 of a container 91 containing a sensor included in the smoke detection device 9, and main components contained in the container 91.
  • FIG. 3B is a diagram showing a lid 912 that closes the top opening of the main body 911 of the container 91 .
  • the container 91 is composed of a main body 911 and a lid 912 .
  • FIG. 3C is a diagram showing the blower mechanism 92 arranged on the back surface of the main body 911 of the container 91. As shown in FIG.
  • the smoke detection device 9 includes a light emitting section 93 , a light receiving section 94 and a stray light reducing section 95 as components housed in the container 91 .
  • the light emitting unit 93 emits light for detecting smoke.
  • the light emitted by the light-emitting portion 93 in the direction of the light-emitting axis A1 passes through the light-emitting region R1.
  • the light receiving section 94 receives light traveling in the direction of the light receiving axis A2 from the light receiving region R2, and outputs a signal indicating the intensity of the received light to a signal processing section (not shown).
  • the light receiving portion 94 is arranged such that the light receiving axis A2 intersects the light emitting axis A1.
  • the light received by the light receiving unit 94 is emitted from the light emitting unit 93 and reflected by particles contained in the air within the detection region R3, which is the region where the light emitting region R1 and the light receiving region R2 overlap, to the light receiving unit 94. It is the light that is heading. Since these particles contain a small amount of dust, even in normal times when there is no smoke in the space to be monitored, the light reflected by the dust is received by the light receiving unit 94, and the intensity of the received light is output a signal indicating However, the signal output from the light receiving section 94 is very small in normal times.
  • the air in the detection area R3 contains a small amount of dust and many smoke particles.
  • 94 receives the light and outputs a signal that is larger than normal.
  • the signal processing unit determines that smoke is generated in the space to be monitored, and issues a warning to a host system such as a fire receiver.
  • a predetermined process such as transmission of indicated data is performed.
  • the stray light reduction unit 95 prevents the light emitted from the light emitting unit 93 that is not reflected by the particles contained in the air within the light emitting region R1 from being reflected by the inner wall of the container 91 and directed to the light receiving unit 94. It is a component that The stray light reduction section 95 has a reflecting member 951 and a light blocking plate 952 .
  • the shape of the reflecting member 951 when viewed in a direction perpendicular to a plane including the light emitting axis A1 and the light receiving axis A2 (hereinafter referred to as a reference plane) is a chevron consisting of two reflecting surfaces in which convex surfaces are arranged back to back. It is a member formed as follows. That is, the reflecting member 951 forms the reflecting surface M1 and the reflecting surface M2 shown in FIG. 3(A). The reflecting surface M1 and the reflecting surface M2 are concave reflecting surfaces and reflect light.
  • the light shielding plate 952 is a light shielding plate that is arranged so as to surround the reflection member 951 when viewed in the direction perpendicular to the reference plane, and has an opening H1 that serves as a light passage opening on the light emission axis A1.
  • a large number of irregularities are formed on the inner side of the light shielding plate 952 , that is, on the surface facing the reflecting member 951 .
  • the light that is not reflected by the particles contained in the air within the light emitting region R1 passes through the opening H1 and reaches the reflecting surface M1, is reflected by the reflecting surface M1, and is blocked. It travels toward the inner surface of plate 952 and is then absorbed during repeated reflections at the inner surface of light blocking plate 952, reflective surface M1, and reflective surface M2. Although a small part of the light that has entered the light shielding plate 952 exits through the opening H1 to the outside of the light shielding plate 952, the amount is so small that it does not significantly affect smoke detection.
  • a main body 911 of the container 91 has one or more light shielding plates 9111 arranged perpendicular to the light emitting axis A1.
  • Each of the light shielding plates 9111 has a circular opening centered on the light emitting axis A1, and a light emitting region R1 is formed so as to pass through these openings.
  • the light shielding plate 9111 has a function of blocking and absorbing light emitted from the light emitting part 93 in a direction other than the direction along the light emitting axis A1, and a function of absorbing the light from the outside of the container 91 and flowing into the inside of the container. dust from reaching the light-emitting portion 93 to reduce the adhesion of dirt to the light-emitting portion 93 .
  • the main body 911 of the container 91 has one or more light blocking plates 9112 arranged perpendicular to the light receiving axis A2.
  • Each light shielding plate 9112 has a circular opening centered on the light receiving axis A2, and a light receiving region R2 is formed so as to pass through these openings.
  • the light shielding plate 9112 has a role of blocking and absorbing light that is reflected in a region other than the detection region R3 in the container 91 and directed to the light receiving part 94 in a direction not along the light receiving axis A2, and a function of absorbing light that flows from the outside of the container 91 into the inside. It also plays a role of preventing incoming airborne dust from reaching the light receiving section 94 and reducing adhesion of dirt to the light receiving section 94 .
  • the number of light shielding plates 9111 and 9112 is not limited to three.
  • a main body 911 of the container 91 has an inlet E1, which is an opening through which air flowing from the outside of the container 91 to the inside passes, on its bottom surface.
  • the lid 912 of the container 91 has an outlet E2, which is an opening through which the air flowing out from the inside of the container 91 to the outside passes, on its upper surface.
  • the bottom surface of the main body 911 and the top surface of the lid 912 are two surfaces that face each other with the reference plane interposed therebetween.
  • the positions of the inflow port E1 and the outflow port E2 are approximately in the center of the detection region R3 when viewed in the vertical direction of the reference plane. Therefore, the inflow port E1 and the outflow port E2 are arranged at the same position when the cover 912 is attached to the main body 911 and viewed in the vertical direction of the reference plane. All of the shortest flow paths of air from the inlet E1 to the outlet E2 are located within the detection region R3.
  • the blowing mechanism 92 has a box-shaped member 921 arranged on the back surface of the main body 911 and a blowing part 922 and a filter 923 arranged inside the box-shaped member 921 .
  • the box-shaped member 921 has an open side surface on the lower side in FIG. 3C, and the direction of the arrow B1 shown in FIG. It forms a flow path for air moving in the direction towards E1.
  • the air blower 922 has a fan that is rotated by a motor, for example, and moves the inside of the box-shaped member 921 from the outside of the smoke detector 9 in the direction of the arrow B1, and then blows the air from the inlet E1 into the container 91. produce flow.
  • the filter 923 captures dust larger than the size of smoke particles, among the dust contained in the air flowing from the outside of the smoke detection device 9 into the container 91 by the air blower 922, and stores the dust in the container. Prevents intrusion into 91.
  • the air that has flowed into the container 91 from the inlet E1 by the blower mechanism 92 passes through the detection region R3 inside the container 91, and then flows out of the smoke detection device 9 from the outlet E2.
  • a sensor composed of the light-emitting portion 93, the light-receiving portion 94, and the signal processing portion detects smoke in the air passing through the detection region R3.
  • FIG. 1 is a diagram schematically showing the configuration of the smoke detection device 1. As shown in FIG. 1, among the constituent parts provided in the smoke detection device 1, those that are common or correspond to those provided in the smoke detection device 9 are given the same reference numerals as those given to the constituent parts of the smoke detection device 9. there is
  • FIG. 1(A) is a diagram showing a main body 911 of the container 91 of the smoke detection device 1 and main constituent parts accommodated in the container 91.
  • FIG. FIG. 1B is a diagram showing a lid 912 of the container 91 of the smoke detection device 1.
  • FIG. 1C is a diagram showing the blower mechanism 92 of the smoke detection device 1.
  • the smoke detection device 1 differs from the smoke detection device 9 in the following points.
  • the position of the outflow port E2 is outside the light emitting region R1 and outside the light receiving region R2. Therefore, inevitably, the position of the outflow port E2 is also outside the detection region R3.
  • the main body 911 of the container 91 of the smoke detection device 1 has the partition plate 11 as a component that the smoke detection device 9 does not have.
  • the partition plate 11 is a plate-like member arranged so as to surround the inlet E1 when viewed in the direction perpendicular to the reference plane.
  • the partition plate 11 has an opening H2 that serves as a flow path for air flowing in the direction along the reference plane.
  • the outflow port E2 is arranged at the same position as the inflow port E1 when viewed in the direction perpendicular to the reference plane, so the partition plate 11 also surrounds the outflow port E2. are placed in Therefore, all of the shortest flow paths of air from the inlet E1 to the outlet E2 are located within the area surrounded by the partition plate 11 .
  • the reflecting member 951 forms a single curved reflecting surface M1. That is, the shape of the reflective member 951 provided in the smoke detection device 1 is a shape obtained by removing the portion forming the reflective surface M2 from the reflective member 951 provided in the smoke detection device 9 .
  • a space created by removing a portion of the reflecting member 951 that forms the reflecting surface M2 is surrounded by the partition plate 11, and the inlet E1 and the outlet E2 are arranged inside the partition plate 11. . Therefore, the area surrounded by the partition plate 11 and the area surrounded by the light shielding plate 952 are adjacent to each other.
  • the smoke detection device 1 when smoke particles are contained in the air that has flowed into the container 91 from the inlet E1, some of the smoke particles pass through the opening H2 and reach the detection region R3, whereupon they reach the detection region R3. The light emitted from 93 is reflected toward the light receiving portion 94 . Therefore, the smoke detection device 1 detects smoke.
  • the time required to detect smoke after smoke is generated in the space to be monitored is slightly shorter than that required by the smoke detection device 9. It has been confirmed that the smoke detection accuracy of the smoke detection device 1 is not lower than that of the smoke detection device 9, although the time is longer.
  • the inlet E1 is located outside the light emitting region R1, the light receiving region R2, and the detection region R3. A negligibly small amount of the light reflected by the dirt reaches the light receiving section 94 .
  • the outflow port E2 is located outside the light emitting region R1, the light receiving region R2, and the detection region R3. A negligibly small amount of the light reflected by the dirt reaches the light receiving section 94 .
  • the movement of dust in the air that has flowed into the container 91 from the inlet E1 toward the light emitting region R1, the light receiving region R2, or the detection region R3 is blocked by the partition plate 11. . Therefore, the amount of dirt adhering to the inner surface of the container 91 and the like in the light emitting region R1, the light receiving region R2, and the detection region R3 is reduced. Therefore, the amount of light that is reflected by dirt in those areas and directed to the light receiving section 94 is reduced.
  • the smoke detection device 1 compared to the smoke detection device 9, the amount of light reflected by dirt in the container 91 and directed to the light receiving section 94 is reduced. Therefore, in the smoke detection device 1 , compared with the case of the smoke detection device 9 , deterioration of smoke detection accuracy due to contamination is less likely to occur.
  • FIG. 2 is a diagram schematically showing the configuration of a smoke detection device 1 according to one example of this modification.
  • the position of the inlet E1 is different in the smoke detection device 1 shown in FIG. That is, the inlet E1 is positioned inside the light emitting region R1 and outside the detection region R3.
  • the inlet E1 and the outlet E2 are arranged at different positions when viewed in the vertical direction of the reference plane.
  • the inlet E1 is positioned outside the area surrounded by the partition plate 11 . All of the shortest paths of air from the inlet E1 to the outlet E2 are located outside the light receiving region R2 (thus, outside the detection region R3).
  • the inlet E1 may be positioned inside the light emitting region R1, while the outlet E2 may be positioned outside the light emitting region R1.
  • the inlet E1 may be positioned outside the light emitting region R1, while the outlet E2 may be positioned inside the light emitting region R1.
  • part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light emitting region R1.
  • the inlet E1 may be positioned outside the light receiving region R2, while the outlet E2 may be positioned inside the light receiving region R2.
  • the inlet E1 may be positioned inside the light receiving region R2, while the outlet E2 may be positioned outside the light receiving region R2. In those cases, part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light receiving region R2.
  • the inlet E1 may be positioned outside the detection region R3, while the outlet E2 may be positioned inside the detection region R3.
  • the inlet E1 may be positioned inside the detection region R3, while the outlet E2 may be positioned outside the detection region R3. In those cases, part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the detection region R3.
  • the air from the inlet E1 to the outlet E2 when a part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light emitting region R1, the light receiving region R2, or the detection region R3, the air from the inlet E1 to the outlet Compared to the case where all of the shortest flow paths of the air toward E2 are outside of these regions, the effect of reducing the amount of light reflected by dirt in the container 91 and directed to the light receiving unit 94 is low, but the effect of reducing the amount of light toward the light receiving unit 94 is low. Since the distance between the detection region R3 and the shortest flow path of air from the outlet E2 to the outlet E2 is short, the time from the generation of smoke in the space to be monitored until the smoke is detected is shortened.
  • the inlet E1 may be positioned outside the area surrounded by the partition plate 11, as in the example of FIG. Also, the outflow port E2 may be positioned outside the area surrounded by the partition plate 11 . Further, the smoke detection device 1 does not have to include the partition plate 11 .
  • the inflow port E1 When the inflow port E1 is positioned outside the region surrounded by the partition plate 11, compared with the case where the inflow port E1 is positioned inside the region surrounded by the partition plate 11, the light emitting region R1 and the light receiving region R1 from the inflow port E1 Since the amount of dust that travels toward the region R2 or the detection region R3 increases, the effect of reducing the amount of light that is reflected by dirt in the container 91 and travels toward the light receiving unit 94 is reduced. Since the flow of the air is not obstructed by the partition plate 11, the time from when the smoke is generated in the space to be monitored until the smoke is detected is shortened.
  • the outflow port E2 When the outflow port E2 is positioned outside the region surrounded by the partition plate 11, compared with the case where the outflow port E2 is positioned inside the region surrounded by the partition plate 11, the light emitting region R1 and the light receiving region R1 from the inflow port E1 Since the amount of dust traveling toward the region R2 or the detection region R3 increases, the effect of reducing the amount of light reflected by dirt in the container 91 and traveling toward the light receiving unit 94 is reduced. Since the inflowing air is forcibly moved toward the outlet E2 located in the area outside the area surrounded by the partition plate 11, which is the same as the detection area R3, the smoke is detected after it is generated in the space to be monitored. time to become shorter.
  • the smoke detection device 1 may include a stray light reduction section 95 having the same configuration as the stray light reduction section 95 of the smoke detection device 9 .
  • SYMBOLS 1 Smoke detector, 9... Smoke detector, 11... Partition plate, 91... Container, 92... Blower mechanism, 93... Light-emitting part, 94... Light-receiving part, 95... Stray-light reduction part, 911... Main body, 912... Lid, 921 -- Box-shaped member, 922 -- Blower unit, 923 -- Filter, 951 -- Reflecting member, 952 -- Light shielding plate, 9111 -- Light shielding plate, 9112 -- Light shielding plate.

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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)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The present invention provides a smoke detection device that is less likely to experience a decrease in the accuracy of smoke detection due to attachment of dirt. A smoke detection device 1 according to an embodiment of the present invention comprises: a light emitting unit 93 that emits light toward a detection region R3 in a container 91; a light reception unit 94 that receives some of the light emitted by the light emitting unit 93 and reflected by particles in the air in the detection region R3; and a signal processing unit that determines the presence or absence of smoke on the basis of a signal indicating the intensity of the light received by the light reception unit 94. An air inlet E1 and outlet E2 provided in the container 91 are positioned outside the detection region R3. Further, the inlet E1 and the outlet E2 are surrounded by a partition board 11 having an opening H2. Thus, of the dust included in the air that has flown into the container 91 from the inlet E1, the amount of dust that reaches the detection region R3 is reduced, and the amount of light that is reflected by the dust attached to the inner surface and the like of the container 91 in the detection region R3 and that travels toward the light reception unit 94 is reduced. As a result, a decrease in the accuracy of smoke detection due to attachment of dirt is less likely to occur.

Description

煙検知装置smoke detector
　本発明は、煙を検知する装置に関する。 The present invention relates to a device for detecting smoke.
　監視対象の空間に含まれる煙を検知することで、監視対象の空間における煙の発生を検知する煙検知装置がある。 There is a smoke detection device that detects the generation of smoke in the monitored space by detecting the smoke contained in the monitored space.
　煙検知装置は一般的に、煙を検知するセンサと、当該センサを収容する容器を備える。そして、センサを収容する容器は、監視対象の空間である外部から内部へ流入する空気が通過する開口である流入口と、内部から外部へ流出する空気が通過する開口である流出口を有する。 A smoke detection device generally includes a sensor that detects smoke and a container that houses the sensor. The container housing the sensor has an inlet, which is an opening through which air flows from the outside to the inside, which is a space to be monitored, and an outlet, which is an opening through which air flows out from the inside to the outside.
　空気の流入口と流出口を有する容器と、その容器の内部に収容される煙を検知するセンサとを備える煙検知装置を開示している特許文献として例えば特許文献１がある。 Patent Document 1, for example, discloses a smoke detection device that includes a container having an air inlet and an air outlet, and a sensor for detecting smoke housed inside the container.
特開２０２１－６０１９６号公報Japanese Patent Application Laid-Open No. 2021-60196
　煙検知装置が備えるセンサを収容する容器の内部に流入する空気には、煙の粒子と同程度以下のサイズの粉塵が含まれている。そして、それらの粉塵の一部は流出口から外部へ流出せず、容器の内側面上に付着し汚れとなる。容器内の汚れはセンサの煙検知の精度を低下させる。 The air that flows into the container that houses the sensor of the smoke detection device contains dust that is about the same size as smoke particles or smaller. A part of the dust does not flow out from the outflow port to the outside, but adheres to the inner surface of the container and stains it. Contamination in the container reduces the smoke detection accuracy of the sensor.
　上記の事情に鑑み本発明は、従来技術に係る煙検知装置と比較して、汚れの付着による煙検知の精度の低下が生じにくい煙検知装置を提供する。 In view of the above circumstances, the present invention provides a smoke detection device that is less susceptible to deterioration in smoke detection accuracy due to adherence of dirt, compared to conventional smoke detection devices.
　上記の課題を解決するため、本発明は、発光部と、受光軸が前記発光部の発光軸と交差するように配置された受光部と、前記発光部と前記受光部を収容し空気の流入口と空気の流出口を有する容器と、前記流入口から前記容器内へ向かう空気の流れを生じさせる送風部と、前記受光部が生成する信号に基づき前記容器内を流れる空気中の煙を検知する検知部とを備える煙検知装置であって、前記流入口と前記流出口は、前記容器の壁のうち前記発光軸及び前記受光軸を含む平面を挟んで互いに対向する２面の各々に配置され、前記流入口及び前記流出口の少なくとも一方の位置が、前記平面の垂直方向に見た場合に前記発光部の発光領域と前記受光部の受光領域とが重なり合う検知領域の外側である煙検知装置を提案する。 In order to solve the above problems, the present invention provides a light emitting part, a light receiving part arranged so that the light receiving axis intersects with the light emitting axis of the light emitting part, and an airflow housing the light emitting part and the light receiving part. A container having an inlet and an air outlet, an air blower for generating an air flow from the inlet into the container, and smoke in the air flowing through the container based on signals generated by the light receiving unit. wherein the inflow port and the outflow port are arranged on two surfaces of the wall of the container that face each other across a plane including the light emitting axis and the light receiving axis. and at least one of the inflow port and the outflow port is positioned outside a detection area where the light emitting area of the light emitting section and the light receiving area of the light receiving section overlap when viewed in the direction perpendicular to the plane. Suggest a device.
　本発明に係る煙検知装置によれば、汚れが付着し易い流入口又は流出口の周辺部分が、発光部及び受光部を収容する容器内において検知対象の煙の粒子が浮遊する領域である検知領域の外に位置するため、汚れの付着による煙検知の精度の低下が生じにくい。 According to the smoke detection device according to the present invention, the peripheral portion of the inlet or outlet, to which dirt is likely to adhere, is the area in which the smoke particles to be detected float in the container housing the light-emitting unit and the light-receiving unit. Since it is located outside the area, it is difficult for the accuracy of smoke detection to deteriorate due to adhesion of dirt.
一実施形態に係る煙検知装置の構成を模式的に示した図。The figure which showed typically the structure of the smoke detection apparatus which concerns on one Embodiment. 一変形例に係る煙検知装置の構成を模式的に示した図。The figure which showed typically the structure of the smoke detection apparatus which concerns on a modification. 従来技術に係る煙検知装置の構成を模式的に示した図。The figure which showed typically the structure of the smoke detection apparatus which concerns on a prior art.
［比較例］
　以下に、本発明の一実施形態に係る煙検知装置と比較される、従来技術に係る煙検知装置を説明する。 [Comparative example]
Below, a smoke detection device according to the prior art will be described to be compared with a smoke detection device according to an embodiment of the present invention.
　図３は、従来技術に係る煙検知装置９の構成を模式的に示した図である。図３（Ａ）は煙検知装置９に含まれるセンサを収容する容器９１の本体９１１と、容器９１内に収容されている主要な構成部を示した図である。図３（Ｂ）は容器９１の本体９１１の上面の開口を塞ぐ蓋９１２を示した図である。容器９１は本体９１１と蓋９１２により構成される。図３（Ｃ）は容器９１の本体９１１の裏面に配置された送風機構９２を示した図である。 FIG. 3 is a diagram schematically showing the configuration of a smoke detection device 9 according to conventional technology. FIG. 3(A) is a view showing a main body 911 of a container 91 containing a sensor included in the smoke detection device 9, and main components contained in the container 91. FIG. FIG. 3B is a diagram showing a lid 912 that closes the top opening of the main body 911 of the container 91 . The container 91 is composed of a main body 911 and a lid 912 . FIG. 3C is a diagram showing the blower mechanism 92 arranged on the back surface of the main body 911 of the container 91. As shown in FIG.
　煙検知装置９は、容器９１に収容される構成部として、発光部９３、受光部９４、迷光低減部９５を備える。 The smoke detection device 9 includes a light emitting section 93 , a light receiving section 94 and a stray light reducing section 95 as components housed in the container 91 .
　発光部９３は煙を検知するための光を発光する。発光部９３が発光軸Ａ１の方向に発光する光は発光領域Ｒ１を通過する。 The light emitting unit 93 emits light for detecting smoke. The light emitted by the light-emitting portion 93 in the direction of the light-emitting axis A1 passes through the light-emitting region R1.
　受光部９４は、受光領域Ｒ２から受光軸Ａ２の方向に向かう光を受光し、受光した光の強度を示す信号を信号処理部（図示略）に出力する。受光部９４は、受光軸Ａ２が発光軸Ａ１と交差するように配置されている。 The light receiving section 94 receives light traveling in the direction of the light receiving axis A2 from the light receiving region R2, and outputs a signal indicating the intensity of the received light to a signal processing section (not shown). The light receiving portion 94 is arranged such that the light receiving axis A2 intersects the light emitting axis A1.
　受光部９４が受光する光の大半は、発光部９３から発光され、発光領域Ｒ１と受光領域Ｒ２とが重なり合う領域である検知領域Ｒ３内の空気に含まれる粒子において反射して受光部９４へと向かう光である。それらの粒子には、微量の粉塵が含まれるため、監視対象の空間において煙が発生していない平常時においても、それらの粉塵により反射した光を受光部９４が受光し、受光した光の強度を示す信号を出力する。ただし、平常時において受光部９４が出力する信号はごく小さい。 Most of the light received by the light receiving unit 94 is emitted from the light emitting unit 93 and reflected by particles contained in the air within the detection region R3, which is the region where the light emitting region R1 and the light receiving region R2 overlap, to the light receiving unit 94. It is the light that is heading. Since these particles contain a small amount of dust, even in normal times when there is no smoke in the space to be monitored, the light reflected by the dust is received by the light receiving unit 94, and the intensity of the received light is output a signal indicating However, the signal output from the light receiving section 94 is very small in normal times.
　一方、監視対象の空間において煙が発生している非常時においては、検知領域Ｒ３内の空気に微量の粉塵に加え多くの煙の粒子が含まれるため、それらの粒子において反射した光を受光部９４が受光し、平常時より大きい信号を出力する。信号処理部は、そのように平常時より大きい信号が受光部９４から出力された場合、監視対象の空間において煙が発生している、と判定し、例えば火災受信機等の上位システムに警告を示すデータの送信等の所定の処理を行う。 On the other hand, in an emergency when smoke is generated in the space to be monitored, the air in the detection area R3 contains a small amount of dust and many smoke particles. 94 receives the light and outputs a signal that is larger than normal. When a signal larger than normal is output from the light receiving unit 94, the signal processing unit determines that smoke is generated in the space to be monitored, and issues a warning to a host system such as a fire receiver. A predetermined process such as transmission of indicated data is performed.
　迷光低減部９５は、発光部９３から発光された光のうち、発光領域Ｒ１内の空気に含まれる粒子において反射しなかった光が容器９１の内壁において反射して受光部９４に向かわないようにする構成部である。迷光低減部９５は、反射部材９５１と、遮光板９５２とを有する。 The stray light reduction unit 95 prevents the light emitted from the light emitting unit 93 that is not reflected by the particles contained in the air within the light emitting region R1 from being reflected by the inner wall of the container 91 and directed to the light receiving unit 94. It is a component that The stray light reduction section 95 has a reflecting member 951 and a light blocking plate 952 .
　反射部材９５１は、発光軸Ａ１と受光軸Ａ２とを含む平面（以下、基準平面という）の垂直方向に見た場合の形状が、互いに凸面を背中合わせに並べた２つの反射面から成る山形となるように形成された部材である。すなわち、反射部材９５１は、図３（Ａ）に示される反射面Ｍ１と反射面Ｍ２を形成する。反射面Ｍ１と反射面Ｍ２は凹反射面であり、光を反射する。 The shape of the reflecting member 951 when viewed in a direction perpendicular to a plane including the light emitting axis A1 and the light receiving axis A2 (hereinafter referred to as a reference plane) is a chevron consisting of two reflecting surfaces in which convex surfaces are arranged back to back. It is a member formed as follows. That is, the reflecting member 951 forms the reflecting surface M1 and the reflecting surface M2 shown in FIG. 3(A). The reflecting surface M1 and the reflecting surface M2 are concave reflecting surfaces and reflect light.
　遮光板９５２は、基準平面の垂直方向に見た場合に、反射部材９５１の周りを囲むように配置され、発光軸Ａ１上に光の通過口となる開口Ｈ１を有する遮光性の板である。遮光板９５２の内側、すなわち、反射部材９５１に対向する側の面上には、多数の凹凸が形成されている。 The light shielding plate 952 is a light shielding plate that is arranged so as to surround the reflection member 951 when viewed in the direction perpendicular to the reference plane, and has an opening H1 that serves as a light passage opening on the light emission axis A1. A large number of irregularities are formed on the inner side of the light shielding plate 952 , that is, on the surface facing the reflecting member 951 .
　受光部９４から発光された光のうち、発光領域Ｒ１内の空気に含まれる粒子において反射しなかった光は、開口Ｈ１を通過して反射面Ｍ１に達し、反射面Ｍ１において反射して、遮光板９５２の内側面へと向かい、その後、遮光板９５２の内側面、反射面Ｍ１、及び、反射面Ｍ２において繰り返し反射する間に吸収される。なお、遮光板９５２の内側に入った光のごく一部は開口Ｈ１から遮光板９５２の外側に出てゆくが、その量は微少で煙の検知には大きな影響を与えない。 Of the light emitted from the light receiving portion 94, the light that is not reflected by the particles contained in the air within the light emitting region R1 passes through the opening H1 and reaches the reflecting surface M1, is reflected by the reflecting surface M1, and is blocked. It travels toward the inner surface of plate 952 and is then absorbed during repeated reflections at the inner surface of light blocking plate 952, reflective surface M1, and reflective surface M2. Although a small part of the light that has entered the light shielding plate 952 exits through the opening H1 to the outside of the light shielding plate 952, the amount is so small that it does not significantly affect smoke detection.
　容器９１の本体９１１は、発光軸Ａ１と垂直を成すように配置された１枚又は複数枚の遮光板９１１１を有する。遮光板９１１１の各々は、発光軸Ａ１を中心とする円形の開口を有しており、それらの開口を貫くように発光領域Ｒ１が形成されている。遮光板９１１１は、発光部９３から発光される光のうち、発光軸Ａ１に沿った方向ではない方向に向かう光を遮り吸収する役割と、容器９１の外部から内部へと流入してくる空気中の粉塵が発光部９３に到達することを妨げて発光部９３への汚れの付着を低減する役割とを果たす。 A main body 911 of the container 91 has one or more light shielding plates 9111 arranged perpendicular to the light emitting axis A1. Each of the light shielding plates 9111 has a circular opening centered on the light emitting axis A1, and a light emitting region R1 is formed so as to pass through these openings. The light shielding plate 9111 has a function of blocking and absorbing light emitted from the light emitting part 93 in a direction other than the direction along the light emitting axis A1, and a function of absorbing the light from the outside of the container 91 and flowing into the inside of the container. dust from reaching the light-emitting portion 93 to reduce the adhesion of dirt to the light-emitting portion 93 .
　また、容器９１の本体９１１は、受光軸Ａ２と垂直を成すように配置された１枚又は複数枚の遮光板９１１２を有する。遮光板９１１２の各々は、受光軸Ａ２を中心とする円形の開口を有しており、それらの開口を貫くように受光領域Ｒ２が形成されている。遮光板９１１２は、容器９１内の検知領域Ｒ３ではない領域において反射して、受光軸Ａ２に沿わない方向で受光部９４に向かう光を遮り吸収する役割と、容器９１の外部から内部へと流入してくる空気中の粉塵が受光部９４に到達することを妨げて受光部９４への汚れの付着を低減する役割とを果たす。 In addition, the main body 911 of the container 91 has one or more light blocking plates 9112 arranged perpendicular to the light receiving axis A2. Each light shielding plate 9112 has a circular opening centered on the light receiving axis A2, and a light receiving region R2 is formed so as to pass through these openings. The light shielding plate 9112 has a role of blocking and absorbing light that is reflected in a region other than the detection region R3 in the container 91 and directed to the light receiving part 94 in a direction not along the light receiving axis A2, and a function of absorbing light that flows from the outside of the container 91 into the inside. It also plays a role of preventing incoming airborne dust from reaching the light receiving section 94 and reducing adhesion of dirt to the light receiving section 94 .
　なお、図３（Ａ）において、遮光板９１１１及び遮光板９１１２は各々、３枚示されているが、遮光板９１１１及び遮光板９１１２の枚数は３枚に限られない。 Although three light shielding plates 9111 and three light shielding plates 9112 are shown in FIG. 3A, the number of light shielding plates 9111 and 9112 is not limited to three.
　容器９１の本体９１１は、その底面に、容器９１の外部から内部へと流入する空気が通過する開口である流入口Ｅ１を有する。また、容器９１の蓋９１２は、その上面に、容器９１の内部から外部へと流出する空気が通過する開口である流出口Ｅ２を有する。なお、本体９１１の底面と蓋９１２の上面は、基準平面を挟んで互いに対向する２面である。 A main body 911 of the container 91 has an inlet E1, which is an opening through which air flowing from the outside of the container 91 to the inside passes, on its bottom surface. Further, the lid 912 of the container 91 has an outlet E2, which is an opening through which the air flowing out from the inside of the container 91 to the outside passes, on its upper surface. Note that the bottom surface of the main body 911 and the top surface of the lid 912 are two surfaces that face each other with the reference plane interposed therebetween.
　流入口Ｅ１と流出口Ｅ２の位置は、基準平面の垂直方向に見た場合に、検知領域Ｒ３の概ね中央である。従って、流入口Ｅ１と流出口Ｅ２は、本体９１１に蓋９１２が取り付けられた状態において、基準平面の垂直方向に見た場合に同じ位置に配置されている。そして、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の全てが検知領域Ｒ３内に位置する。 The positions of the inflow port E1 and the outflow port E2 are approximately in the center of the detection region R3 when viewed in the vertical direction of the reference plane. Therefore, the inflow port E1 and the outflow port E2 are arranged at the same position when the cover 912 is attached to the main body 911 and viewed in the vertical direction of the reference plane. All of the shortest flow paths of air from the inlet E1 to the outlet E2 are located within the detection region R3.
　送風機構９２は、本体９１１の裏面上に配置された箱状部材９２１と、箱状部材９２１の内側に配置された送風部９２２及びフィルタ９２３を有する。 The blowing mechanism 92 has a box-shaped member 921 arranged on the back surface of the main body 911 and a blowing part 922 and a filter 923 arranged inside the box-shaped member 921 .
　箱状部材９２１は、図３（Ｃ）における下側の側面が開口しており、図３（Ｃ）に示す矢印Ｂ１の方向、すなわち、煙検知装置９の外部の監視対象の空間から流入口Ｅ１に向かう方向に移動する空気の流路を形成する。 The box-shaped member 921 has an open side surface on the lower side in FIG. 3C, and the direction of the arrow B1 shown in FIG. It forms a flow path for air moving in the direction towards E1.
　送風部９２２は、例えばモータにより回転するファンを有し、煙検知装置９の外部から箱状部材９２１の内側を矢印Ｂ１の方向に移動した後、流入口Ｅ１から容器９１内へと向かう空気の流れを生じさせる。 The air blower 922 has a fan that is rotated by a motor, for example, and moves the inside of the box-shaped member 921 from the outside of the smoke detector 9 in the direction of the arrow B1, and then blows the air from the inlet E1 into the container 91. produce flow.
　フィルタ９２３は、送風部９２２により煙検知装置９の外部から容器９１内へと向かう空気に含まれる粉塵のうち、煙の粒子と同程度の大きさよりも大きい粉塵を捕捉し、それらの粉塵の容器９１内への侵入を阻止する。 The filter 923 captures dust larger than the size of smoke particles, among the dust contained in the air flowing from the outside of the smoke detection device 9 into the container 91 by the air blower 922, and stores the dust in the container. Prevents intrusion into 91.
　送風機構９２により流入口Ｅ１から容器９１内へと流入した空気は、容器９１内で検知領域Ｒ３を通過した後、流出口Ｅ２から煙検知装置９の外部へと流出する。そして、発光部９３、受光部９４及び信号処理部により構成されるセンサは、検知領域Ｒ３を通過する空気中の煙を検知する。以上が、従来技術に係る煙検知装置９の構成の説明である。 The air that has flowed into the container 91 from the inlet E1 by the blower mechanism 92 passes through the detection region R3 inside the container 91, and then flows out of the smoke detection device 9 from the outlet E2. A sensor composed of the light-emitting portion 93, the light-receiving portion 94, and the signal processing portion detects smoke in the air passing through the detection region R3. The above is the description of the configuration of the smoke detection device 9 according to the prior art.
　ところで、一般的に、容器９１の内側面のうち流入口Ｅ１の周辺部分と流出口Ｅ２の周辺部分には、その他の部分と比較して汚れが付着し易い。そして、従来技術に係る煙検知装置９においては、流入口Ｅ１及び流出口Ｅ２が検知領域Ｒ３内に位置している。そのため、煙検知装置９においては、発光部９３から発光された光の一部が、流入口Ｅ１の周辺部分に付着した汚れや、流出口Ｅ２の周辺部分に付着した汚れにおいて反射して、受光部９４に向かい、検知領域Ｒ３内の空気中に煙の粒子が含まれていなくても、受光部９４が出力する信号が大きくなり、煙が誤って検知される、という不都合が生じ易い。 By the way, in general, of the inner surface of the container 91, dirt tends to adhere to the peripheral portion of the inflow port E1 and the peripheral portion of the outflow port E2 compared to other portions. In the conventional smoke detection device 9, the inlet E1 and the outlet E2 are positioned within the detection region R3. Therefore, in the smoke detection device 9, part of the light emitted from the light emitting part 93 is reflected by the dirt adhering to the peripheral portion of the inlet E1 and the dirt adhering to the peripheral portion of the outlet E2, and is received. Even if smoke particles are not contained in the air within the detection region R3 toward the portion 94, the signal output from the light receiving portion 94 becomes large, and smoke is likely to be erroneously detected.
［実施形態］
　以下に、本発明の一実施形態に係る煙検知装置１を説明する。図１は、煙検知装置１の構成を模式的に示した図である。図１において、煙検知装置１が備える構成部のうち、煙検知装置９が備える構成部と共通又は対応するものに関しては、煙検知装置９の構成部に付した符号と同じ符号が付されている。 [Embodiment]
A smoke detection device 1 according to an embodiment of the present invention will be described below. FIG. 1 is a diagram schematically showing the configuration of the smoke detection device 1. As shown in FIG. In FIG. 1, among the constituent parts provided in the smoke detection device 1, those that are common or correspond to those provided in the smoke detection device 9 are given the same reference numerals as those given to the constituent parts of the smoke detection device 9. there is
　図１（Ａ）は煙検知装置１の容器９１の本体９１１と、容器９１内に収容されている主要な構成部を示した図である。図１（Ｂ）は煙検知装置１の容器９１の蓋９１２を示した図である。図１（Ｃ）は煙検知装置１の送風機構９２を示した図である。 FIG. 1(A) is a diagram showing a main body 911 of the container 91 of the smoke detection device 1 and main constituent parts accommodated in the container 91. FIG. FIG. 1B is a diagram showing a lid 912 of the container 91 of the smoke detection device 1. FIG. FIG. 1C is a diagram showing the blower mechanism 92 of the smoke detection device 1. FIG.
　煙検知装置１は、煙検知装置９と比較し、以下の点が異なっている。 The smoke detection device 1 differs from the smoke detection device 9 in the following points.
（１）流入口Ｅ１の位置
　煙検知装置１においては、流入口Ｅ１の位置が、発光領域Ｒ１の外であり、かつ、受光領域Ｒ２の外である。従って、必然的に、流入口Ｅ１の位置は、検知領域Ｒ３の外でもある。 (1) Position of inlet E1 In the smoke detector 1, the position of the inlet E1 is outside the light emitting region R1 and outside the light receiving region R2. Therefore, inevitably, the position of the inlet E1 is also outside the detection region R3.
（２）流出口Ｅ２の位置
　煙検知装置１においては、煙検知装置９と同様に、流入口Ｅ１と流出口Ｅ２は基準平面の垂直方向に見た場合に同じ位置に配置されている。従って、煙検知装置１においては、流入口Ｅ１の位置が煙検知装置９における場合と異なるため、流出口Ｅ２の位置も煙検知装置９における場合と異なる。 (2) Position of outflow port E2 In the smoke detection device 1, as in the smoke detection device 9, the inflow port E1 and the outflow port E2 are arranged at the same position when viewed in the vertical direction of the reference plane. Therefore, in the smoke detection device 1, the position of the inlet E1 is different from that in the smoke detection device 9, so the position of the outlet E2 is also different from that in the smoke detection device 9. FIG.
　すなわち、煙検知装置１においては、流出口Ｅ２の位置が、発光領域Ｒ１の外であり、かつ、受光領域Ｒ２の外である。従って、必然的に、流出口Ｅ２の位置は、検知領域Ｒ３の外でもある。 That is, in the smoke detection device 1, the position of the outflow port E2 is outside the light emitting region R1 and outside the light receiving region R2. Therefore, inevitably, the position of the outflow port E2 is also outside the detection region R3.
　また、煙検知装置１においては、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の全てが、発光領域Ｒ１の外であり、かつ、受光領域Ｒ２の外である。従って、必然的に、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の全てが、検知領域Ｒ３の外でもある。 In addition, in the smoke detection device 1, all the shortest flow paths of air from the inlet E1 to the outlet E2 are outside the light emitting region R1 and the light receiving region R2. Therefore, inevitably, all of the shortest flow paths of air from the inlet E1 to the outlet E2 are also outside the detection region R3.
（３）仕切板１１の追加
　煙検知装置１の容器９１の本体９１１は、煙検知装置９が備えない構成部として、仕切板１１を有する。仕切板１１は、基準平面の垂直方向に見た場合に、流入口Ｅ１を囲むように配置された板状の部材である。仕切板１１は、基準平面に沿った方向に流れる空気の流路となる開口Ｈ２を有する。 (3) Addition of partition plate 11 The main body 911 of the container 91 of the smoke detection device 1 has the partition plate 11 as a component that the smoke detection device 9 does not have. The partition plate 11 is a plate-like member arranged so as to surround the inlet E1 when viewed in the direction perpendicular to the reference plane. The partition plate 11 has an opening H2 that serves as a flow path for air flowing in the direction along the reference plane.
　本実施形態に係る煙検知装置１においては、基準平面の垂直方向に見た場合に、流出口Ｅ２が流入口Ｅ１と同じ位置に配置されているため、仕切板１１は流出口Ｅ２も囲むように配置されている。従って、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の全てが仕切板１１で囲まれた領域内に位置している。 In the smoke detection device 1 according to the present embodiment, the outflow port E2 is arranged at the same position as the inflow port E1 when viewed in the direction perpendicular to the reference plane, so the partition plate 11 also surrounds the outflow port E2. are placed in Therefore, all of the shortest flow paths of air from the inlet E1 to the outlet E2 are located within the area surrounded by the partition plate 11 .
（４）迷光低減部９５の構成
　煙検知装置１においては、反射部材９５１が湾曲した単一の反射面である反射面Ｍ１を形成する。すなわち、煙検知装置１が備える反射部材９５１の形状は、煙検知装置９が備える反射部材９５１のうち、反射面Ｍ２を形成する部分を除去した形状である。 (4) Configuration of Stray Light Reduction Section 95 In the smoke detection device 1, the reflecting member 951 forms a single curved reflecting surface M1. That is, the shape of the reflective member 951 provided in the smoke detection device 1 is a shape obtained by removing the portion forming the reflective surface M2 from the reflective member 951 provided in the smoke detection device 9 .
　煙検知装置１においては、反射部材９５１のうち反射面Ｍ２を形成する部分が除去されたために生じた空間が仕切板１１により囲まれ、その内側に流入口Ｅ１と流出口Ｅ２が配置されている。そのため、仕切板１１により囲まれる領域と、遮光板９５２により囲まれる領域が互いに隣接している。 In the smoke detection device 1, a space created by removing a portion of the reflecting member 951 that forms the reflecting surface M2 is surrounded by the partition plate 11, and the inlet E1 and the outlet E2 are arranged inside the partition plate 11. . Therefore, the area surrounded by the partition plate 11 and the area surrounded by the light shielding plate 952 are adjacent to each other.
（５）送風機構９２の位置
　煙検知装置１においては、流入口Ｅ１の位置が煙検知装置９における場合と異なるため、送風機構９２の位置が煙検知装置９における場合と異なる。 (5) Position of blower mechanism 92 In the smoke detection device 1 , the position of the inlet E<b>1 is different from that in the smoke detection device 9 , so the position of the blower mechanism 92 is different from that in the smoke detection device 9 .
　以上が、煙検知装置９と比較し煙検知装置１が異なっている点の説明である。 The above is an explanation of the differences of the smoke detection device 1 compared to the smoke detection device 9.
　煙検知装置１においては、流入口Ｅ１から容器９１内へと流入した空気に煙の粒子が含まれている場合、煙の粒子の一部は開口Ｈ２を通って検知領域Ｒ３に達し、発光部９３から発光された光を受光部９４に向けて反射する。そのため、煙検知装置１によって煙の検知が行われる。 In the smoke detection device 1, when smoke particles are contained in the air that has flowed into the container 91 from the inlet E1, some of the smoke particles pass through the opening H2 and reach the detection region R3, whereupon they reach the detection region R3. The light emitted from 93 is reflected toward the light receiving portion 94 . Therefore, the smoke detection device 1 detects smoke.
　なお、本願発明者が行った実験によって、煙検知装置１によれば、監視対象の空間において煙が発生した後、煙を検知するまでに要する時間が煙検知装置９による場合と比較し僅かに長くなるものの、煙検知装置１の煙検知の精度が煙検知装置９より下がることはないことが確認されている。 In addition, according to the experiment conducted by the inventor of the present application, according to the smoke detection device 1, the time required to detect smoke after smoke is generated in the space to be monitored is slightly shorter than that required by the smoke detection device 9. It has been confirmed that the smoke detection accuracy of the smoke detection device 1 is not lower than that of the smoke detection device 9, although the time is longer.
　上述した煙検知装置１においては、流入口Ｅ１が発光領域Ｒ１、受光領域Ｒ２、及び、検知領域Ｒ３の外に位置しているため、流入口Ｅ１の周辺部分に汚れが付着しても、その汚れに反射した光のうち受光部９４に達するものは無視できる程度に少ない。 In the smoke detection device 1 described above, the inlet E1 is located outside the light emitting region R1, the light receiving region R2, and the detection region R3. A negligibly small amount of the light reflected by the dirt reaches the light receiving section 94 .
　また、煙検知装置１においては、流出口Ｅ２が発光領域Ｒ１、受光領域Ｒ２、及び、検知領域Ｒ３の外に位置しているため、流出口Ｅ２の周辺部分に汚れが付着しても、その汚れに反射した光のうち受光部９４に達するものは無視できる程度に少ない。 Further, in the smoke detection device 1, the outflow port E2 is located outside the light emitting region R1, the light receiving region R2, and the detection region R3. A negligibly small amount of the light reflected by the dirt reaches the light receiving section 94 .
　また、煙検知装置１においては、流入口Ｅ１から容器９１内に流入した空気中の粉塵の、発光領域Ｒ１、受光領域Ｒ２、又は、検知領域Ｒ３に向かう移動が、仕切板１１により阻害される。そのため、発光領域Ｒ１、受光領域Ｒ２、及び、検知領域Ｒ３における容器９１の内側面等に付着する汚れの量が低減される。従って、それらの領域において汚れに反射して受光部９４に向かう光の量が低減される。 In addition, in the smoke detection device 1, the movement of dust in the air that has flowed into the container 91 from the inlet E1 toward the light emitting region R1, the light receiving region R2, or the detection region R3 is blocked by the partition plate 11. . Therefore, the amount of dirt adhering to the inner surface of the container 91 and the like in the light emitting region R1, the light receiving region R2, and the detection region R3 is reduced. Therefore, the amount of light that is reflected by dirt in those areas and directed to the light receiving section 94 is reduced.
　上記のように、煙検知装置１においては、煙検知装置９における場合と比較し、容器９１内の汚れに反射して受光部９４に向かう光の量が少なくなる。従って、煙検知装置１においては、煙検知装置９における場合と比較し、汚れによる煙検知の精度の低下が生じにくい。 As described above, in the smoke detection device 1, compared to the smoke detection device 9, the amount of light reflected by dirt in the container 91 and directed to the light receiving section 94 is reduced. Therefore, in the smoke detection device 1 , compared with the case of the smoke detection device 9 , deterioration of smoke detection accuracy due to contamination is less likely to occur.
［変形例］
　上述の実施形態は本発明の一具体例であって、本発明の技術的思想の範囲内において様々に変形可能である。以下にそれらの変形の例を示す。なお、以下に示す２以上の変形例が適宜組み合わされてもよい。 [Modification]
The above-described embodiment is a specific example of the present invention, and various modifications are possible within the scope of the technical idea of the present invention. Examples of these modifications are shown below. Note that two or more modified examples shown below may be appropriately combined.
（変形例１）
　上述した実施形態における流入口Ｅ１と流出口Ｅ２の位置は例示であって、流入口Ｅ１及び流出口Ｅ２の少なくとも一方が検知領域Ｒ３の外側である限り、他の位置が採用されてもよい。 (Modification 1)
The positions of the inflow port E1 and the outflow port E2 in the above-described embodiment are examples, and other positions may be adopted as long as at least one of the inflow port E1 and the outflow port E2 is outside the detection region R3.
　図２は、この変形例の一例に係る煙検知装置１の構成を模式的に示した図である。上述した実施形態に係る煙検知装置１（図１参照）と比較し、図２に示す煙検知装置１においては、流入口Ｅ１の位置が異なっている。すなわち、流入口Ｅ１が発光領域Ｒ１の内側かつ検知領域Ｒ３の外側に位置している。その結果、流入口Ｅ１と流出口Ｅ２が、基準平面の垂直方向に見た場合に異なる位置に配置されている。また、流入口Ｅ１が、仕切板１１に囲まれた領域の外側に位置している。そして、流入口Ｅ１から流出口Ｅ２に向かう空気の最短経路の全てが受光領域Ｒ２の外側（従って、検知領域Ｒ３の外側）に位置している。 FIG. 2 is a diagram schematically showing the configuration of a smoke detection device 1 according to one example of this modification. Compared with the smoke detection device 1 (see FIG. 1) according to the embodiment described above, the position of the inlet E1 is different in the smoke detection device 1 shown in FIG. That is, the inlet E1 is positioned inside the light emitting region R1 and outside the detection region R3. As a result, the inlet E1 and the outlet E2 are arranged at different positions when viewed in the vertical direction of the reference plane. In addition, the inlet E1 is positioned outside the area surrounded by the partition plate 11 . All of the shortest paths of air from the inlet E1 to the outlet E2 are located outside the light receiving region R2 (thus, outside the detection region R3).
　図２の例のように、流入口Ｅ１は発光領域Ｒ１の内側に位置する一方で、流出口Ｅ２は発光領域Ｒ１の外側に位置するように配置されてもよい。また、流入口Ｅ１は発光領域Ｒ１の外側に位置する一方で、流出口Ｅ２は発光領域Ｒ１の内側に位置するように配置されてもよい。それらの場合、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の一部が発光領域Ｒ１内に位置することになる。 As in the example of FIG. 2, the inlet E1 may be positioned inside the light emitting region R1, while the outlet E2 may be positioned outside the light emitting region R1. Alternatively, the inlet E1 may be positioned outside the light emitting region R1, while the outlet E2 may be positioned inside the light emitting region R1. In those cases, part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light emitting region R1.
　流入口Ｅ１は受光領域Ｒ２の外側に位置する一方で、流出口Ｅ２は受光領域Ｒ２の内側に位置するように配置されてもよい。また、流入口Ｅ１は受光領域Ｒ２の内側に位置する一方で、流出口Ｅ２は受光領域Ｒ２の外側に位置するように配置されてもよい。それらの場合、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の一部が受光領域Ｒ２内に位置することになる。 The inlet E1 may be positioned outside the light receiving region R2, while the outlet E2 may be positioned inside the light receiving region R2. Alternatively, the inlet E1 may be positioned inside the light receiving region R2, while the outlet E2 may be positioned outside the light receiving region R2. In those cases, part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light receiving region R2.
　流入口Ｅ１は検知領域Ｒ３の外側に位置する一方で、流出口Ｅ２は検知領域Ｒ３の内側に位置するように配置されてもよい。また、流入口Ｅ１は検知領域Ｒ３の内側に位置する一方で、流出口Ｅ２は検知領域Ｒ３の外側に位置するように配置されてもよい。それらの場合、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の一部が検知領域Ｒ３内に位置することになる。 The inlet E1 may be positioned outside the detection region R3, while the outlet E2 may be positioned inside the detection region R3. Alternatively, the inlet E1 may be positioned inside the detection region R3, while the outlet E2 may be positioned outside the detection region R3. In those cases, part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the detection region R3.
　上記のように、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の一部が発光領域Ｒ１内、受光領域Ｒ２内、又は、検知領域Ｒ３内に位置する場合、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路の全てがそれらの領域外である場合と比較し、容器９１内の汚れに反射して受光部９４に向かう光の量の低減効果は低くなるが、流入口Ｅ１から流出口Ｅ２に向かう空気の最短流路と検知領域Ｒ３との距離が近くなるため、監視対象の空間で煙が発生した後、煙が検知されるまでの時間は短くなる。 As described above, when a part of the shortest flow path of air from the inlet E1 to the outlet E2 is located within the light emitting region R1, the light receiving region R2, or the detection region R3, the air from the inlet E1 to the outlet Compared to the case where all of the shortest flow paths of the air toward E2 are outside of these regions, the effect of reducing the amount of light reflected by dirt in the container 91 and directed to the light receiving unit 94 is low, but the effect of reducing the amount of light toward the light receiving unit 94 is low. Since the distance between the detection region R3 and the shortest flow path of air from the outlet E2 to the outlet E2 is short, the time from the generation of smoke in the space to be monitored until the smoke is detected is shortened.
（変形例２）
　図２の例のように、流入口Ｅ１が仕切板１１で囲まれた領域の外側に位置していてもよい。また、流出口Ｅ２が仕切板１１で囲まれた領域の外側に位置していてもよい。また、煙検知装置１が仕切板１１を備えなくてもよい。 (Modification 2)
The inlet E1 may be positioned outside the area surrounded by the partition plate 11, as in the example of FIG. Also, the outflow port E2 may be positioned outside the area surrounded by the partition plate 11 . Further, the smoke detection device 1 does not have to include the partition plate 11 .
　流入口Ｅ１が仕切板１１で囲まれた領域の外側に位置する場合、流入口Ｅ１が仕切板１１で囲まれた領域の内側に位置する場合と比較し、流入口Ｅ１から発光領域Ｒ１、受光領域Ｒ２、又は、検知領域Ｒ３に向かう粉塵の量は増えるため、容器９１内の汚れに反射して受光部９４に向かう光の量の低減効果は低くなるが、流入口Ｅ１から検知領域Ｒ３に向かう空気の流れが仕切板１１により阻害されないため、監視対象の空間で煙が発生した後、煙が検知されるまでの時間は短くなる。 When the inflow port E1 is positioned outside the region surrounded by the partition plate 11, compared with the case where the inflow port E1 is positioned inside the region surrounded by the partition plate 11, the light emitting region R1 and the light receiving region R1 from the inflow port E1 Since the amount of dust that travels toward the region R2 or the detection region R3 increases, the effect of reducing the amount of light that is reflected by dirt in the container 91 and travels toward the light receiving unit 94 is reduced. Since the flow of the air is not obstructed by the partition plate 11, the time from when the smoke is generated in the space to be monitored until the smoke is detected is shortened.
　流出口Ｅ２が仕切板１１で囲まれた領域の外側に位置する場合、流出口Ｅ２が仕切板１１で囲まれた領域の内側に位置する場合と比較し、流入口Ｅ１から発光領域Ｒ１、受光領域Ｒ２、又は、検知領域Ｒ３に向かう粉塵の量は増えるため、容器９１内の汚れに反射して受光部９４に向かう光の量の低減効果は低くなるが、流入口Ｅ１から容器９１内に流れ込む空気が、検知領域Ｒ３と同じ仕切板１１で囲まれた領域の外側の領域に位置する流出口Ｅ２に向かい強制移動されるため、監視対象の空間で煙が発生した後、煙が検知されるまでの時間は短くなる。 When the outflow port E2 is positioned outside the region surrounded by the partition plate 11, compared with the case where the outflow port E2 is positioned inside the region surrounded by the partition plate 11, the light emitting region R1 and the light receiving region R1 from the inflow port E1 Since the amount of dust traveling toward the region R2 or the detection region R3 increases, the effect of reducing the amount of light reflected by dirt in the container 91 and traveling toward the light receiving unit 94 is reduced. Since the inflowing air is forcibly moved toward the outlet E2 located in the area outside the area surrounded by the partition plate 11, which is the same as the detection area R3, the smoke is detected after it is generated in the space to be monitored. time to become shorter.
（変形例３）
　煙検知装置１が、煙検知装置９の迷光低減部９５と同じ構成の迷光低減部９５を備えてもよい。 (Modification 3)
The smoke detection device 1 may include a stray light reduction section 95 having the same configuration as the stray light reduction section 95 of the smoke detection device 9 .
　１…煙検知装置、９…煙検知装置、１１…仕切板、９１…容器、９２…送風機構、９３…発光部、９４…受光部、９５…迷光低減部、９１１…本体、９１２…蓋、９２１…箱状部材、９２２…送風部、９２３…フィルタ、９５１…反射部材、９５２…遮光板、９１１１…遮光板、９１１２…遮光板。 DESCRIPTION OF SYMBOLS 1... Smoke detector, 9... Smoke detector, 11... Partition plate, 91... Container, 92... Blower mechanism, 93... Light-emitting part, 94... Light-receiving part, 95... Stray-light reduction part, 911... Main body, 912... Lid, 921 -- Box-shaped member, 922 -- Blower unit, 923 -- Filter, 951 -- Reflecting member, 952 -- Light shielding plate, 9111 -- Light shielding plate, 9112 -- Light shielding plate.

Claims (4)

  1. 　発光部と、受光軸が前記発光部の発光軸と交差するように配置された受光部と、前記発光部と前記受光部を収容し空気の流入口と空気の流出口を有する容器と、前記流入口から前記容器内へ向かう空気の流れを生じさせる送風部と、前記受光部が生成する信号に基づき前記容器内を流れる空気中の煙を検知する検知部とを備える煙検知装置であって、
    　前記流入口と前記流出口は、前記容器の壁のうち前記発光軸及び前記受光軸を含む平面を挟んで互いに対向する２面の各々に配置され、
    　前記流入口及び前記流出口の少なくとも一方の位置が、前記平面の垂直方向に見た場合に前記発光部の発光領域と前記受光部の受光領域とが重なり合う検知領域の外側である
    　煙検知装置。     a light-emitting portion, a light-receiving portion arranged such that a light-receiving axis intersects the light-receiving axis of the light-emitting portion, a container housing the light-emitting portion and the light-receiving portion, and having an air inlet and an air outlet; A smoke detection device comprising: an air blower that generates an air flow from an inlet into the container; and a detector that detects smoke in the air flowing through the container based on a signal generated by the light receiver. ,
    The inflow port and the outflow port are arranged on each of two surfaces of a wall of the container facing each other across a plane including the light emitting axis and the light receiving axis,
    At least one of the inflow port and the outflow port is positioned outside a detection area where the light emitting area of the light emitting section and the light receiving area of the light receiving section overlap when viewed in the direction perpendicular to the plane.
  2. 　前記平面の垂直方向に見た場合に前記流入口及び前記流出口の少なくとも一方の周りを囲むように配置され前記平面に沿った方向に流れる空気の流路となる開口を有する仕切板を備える
    　請求項１に記載の煙検知装置。     A partition plate is provided so as to surround at least one of the inflow port and the outflow port when viewed in a direction perpendicular to the plane, and has an opening serving as a flow path for air flowing in a direction along the plane. Item 1. The smoke detection device according to item 1.
  3. 　前記平面の垂直方向に見た場合に前記流入口及び前記流出口の一方は前記仕切板で囲まれた領域の外側に配置されている
    　請求項２に記載の煙検知装置。     The smoke detection device according to claim 2, wherein one of the inflow port and the outflow port is arranged outside the area surrounded by the partition plate when viewed in a direction perpendicular to the plane.
  4. 　湾曲した単一の反射面を形成する反射部材と、前記平面の垂直方向に見た場合に前記反射部材の周りを囲むように配置され前記発光軸上に光の通過口となる開口を有する遮光板とを有する迷光低減部を備え、
    　前記仕切板により囲まれる領域と前記遮光板により囲まれる領域が互いに隣接している
    　請求項２又は３に記載の煙検知装置。     A light shielding member having a reflecting member forming a single curved reflecting surface and an opening disposed so as to surround the reflecting member when viewed in a direction perpendicular to the plane and serving as a light passage port on the light emission axis. A stray light reduction unit having a plate,
    The smoke detection device according to claim 2 or 3, wherein the area surrounded by the partition plate and the area surrounded by the light shielding plate are adjacent to each other.
PCT/JP2023/004422 2022-02-17 2023-02-09 Smoke detection device WO2023157759A1 (en)

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WO2019155871A1 (en) * 2018-02-09 2019-08-15 日本フェンオール株式会社 Smoke detector

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