JP2010238087A - Photoelectric smoke sensor - Google Patents

Photoelectric smoke sensor Download PDF

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JP2010238087A
JP2010238087A JP2009086877A JP2009086877A JP2010238087A JP 2010238087 A JP2010238087 A JP 2010238087A JP 2009086877 A JP2009086877 A JP 2009086877A JP 2009086877 A JP2009086877 A JP 2009086877A JP 2010238087 A JP2010238087 A JP 2010238087A
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smoke
light
fire
opening
mounting
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JP5153709B2 (en
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Tomohiro Hoshino
智宏 星野
Katsuhiro Suzuki
克裕 鈴木
Takashi Ito
尚 伊藤
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Nohmi Bosai Ltd
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Nohmi Bosai Ltd
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Priority to JP2009086877A priority Critical patent/JP5153709B2/en
Priority to KR1020090082802A priority patent/KR20100037539A/en
Priority to CN2009101619770A priority patent/CN101713733B/en
Priority to TW098131614A priority patent/TWI442346B/en
Priority to US12/566,269 priority patent/US8232885B2/en
Priority to EP09252336A priority patent/EP2172916B1/en
Publication of JP2010238087A publication Critical patent/JP2010238087A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric smoke sensor capable of preventing an erroneous alarm from being issued, even if steam flows into a smoke-detecting unit. <P>SOLUTION: The smoke-detecting unit 1 includes an installation section 20; and a smoke inlet section 10 arranged so as to be overlapped under the installation section 20. The installation section 20 includes: a light-emitting element 22 for emitting the inside of the installation section 20 with light; and a light-receiving element 23 for receiving light emitted from the light-emitting element 22 and scattered by smoke particles of the smoke-detecting unit 1. The smoke inlet section 10 includes a partition wall 11, having an opening 13 for communicating with the installation section 20; a plurality of wall members 12 erected from a lower surface of the partition wall 11 down below, for preventing external light from entering the smoke inlet section 10; and a smoke inlet 14 formed between the wall members 12. The lower surface of the partition wall 11 forming the wall members 12 constitutes an inclined surface 13a, which inclines upward as approaching the opening 13 so as to make the smoke flowing into the smoke inlet section 10 flow along the opening 13 into the installation section 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は光電式煙感知器に関し、特に検煙部に流入した湯気による誤報を防止することができる光電式煙感知器に関する。   The present invention relates to a photoelectric smoke detector, and more particularly, to a photoelectric smoke detector that can prevent erroneous reporting due to steam flowing into a smoke detector.

従来の光電式煙感知器としては、例えば「検煙部本体５の下面には検煙部カバー１１が脱着自在に取り付けられる。検煙部カバー１１の周壁１２の内側には複数のラビリンス部材１３が形成され、ラビリンス部材１３は外部からの煙を流入しやすくするとともに、外部からの光を遮断するように形成されている。また、検煙部カバー１１の周壁１２の外側には防虫網１４が一体的に設けられ、虫が侵入して散乱光が発生するのを防止するようにしている。また、検煙部カバー１１の周壁１２には複数の煙流入口１５が形成されている。検煙部本体５の下面には、ホルダ１６，１７、遮光部材１８および取付部１９が一体に形成され、ホルダ１６には受光素子２０とテスト用赤外線ＬＥＤが収納され、ホルダ１７には煙検出用赤外線ＬＥＤ２１が収納される。遮光部材１８は煙検出用赤外線ＬＥＤ２１から照射される赤外光が受光素子２０に直接入射しないように遮光する。取付部１９には検煙部カバー１１に形成された突起部２２が挿入され、検煙部本体５に検煙部カバー１１が脱着自在に取り付けられる。」（例えば、特許文献１参照）というものが提案されている。   As a conventional photoelectric smoke detector, for example, “a smoke detector cover 11 is detachably attached to the lower surface of the smoke detector body 5. A plurality of labyrinth members 13 are provided inside the peripheral wall 12 of the smoke detector cover 11. The labyrinth member 13 is formed so as to facilitate the inflow of smoke from the outside and to block the light from the outside. Are integrally provided to prevent insects from invading and generating scattered light, and a plurality of smoke inlets 15 are formed in the peripheral wall 12 of the smoke detecting section cover 11. Holders 16 and 17, a light shielding member 18, and a mounting part 19 are integrally formed on the lower surface of the smoke detector body 5. The light receiving element 20 and a test infrared LED are housed in the holder 16. Infrared LED21 The light shielding member 18 shields the infrared light emitted from the smoke detecting infrared LED 21 so as not to directly enter the light receiving element 20. The protrusion portion 22 formed on the smoke detecting portion cover 11 is attached to the attachment portion 19. Is inserted, and the smoke detector cover 11 is detachably attached to the smoke detector main body 5. "(For example, refer to Patent Document 1) has been proposed.

特許２７８７００１号公報（段落００１４〜００１６、第２図，第３図）Japanese Patent No. 2787001 (paragraphs 0014 to 0016, FIGS. 2 and 3)

従来の光電式煙感知器（例えば、特許文献１参照）における検煙部は、周縁部に壁体（ラビリンス部材）が形成された煙流入部内に、発光素子（煙検出用赤外線ＬＥＤ）及び受光素子が設けられていた。つまり、従来の光電式煙感知器は、発光素子と受光素子が設けられた実装部と、煙流入部とが分けられていなかった。したがって、調理場所やホテルの部屋の浴室等で発生した湯気が検煙部に流入すると、誤報してしまうという問題点があった。   A smoke detector in a conventional photoelectric smoke detector (for example, see Patent Document 1) includes a light emitting element (infrared LED for smoke detection) and a light receiving portion in a smoke inflow portion in which a wall (labyrinth member) is formed at the peripheral portion. An element was provided. That is, in the conventional photoelectric smoke detector, the mounting portion provided with the light emitting element and the light receiving element is not separated from the smoke inflow portion. Therefore, when steam generated in a cooking place or a bathroom of a hotel room flows into the smoke detector, there is a problem that a false alarm is generated.

本発明は、上記のような課題を解決するためになされたものであり、検煙部に湯気が流入しても誤報を防止することができる光電式煙感知器を得ることを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a photoelectric smoke detector that can prevent false alarms even if steam flows into the smoke detector.

本発明に係る光電式煙感知器は、検煙部と、検煙部の出力信号に基づいて火災を判断する火災判別部と、を有し、火災判別部が火災と判断すると火災信号を出力する光電式煙感知器において、検煙部は、実装部と、実装部の下側に重ねて配置された煙流入部と、を備え、実装部は、実装部の内部に光を照射する発光素子と、発光素子から照射され、検煙部の煙粒子により生じる散乱光を受光する受光素子と、を有し、煙流入部は、実装部と連通するための開口部を有する仕切り壁と、仕切り壁の下面から下方に立設され、煙流入部に外光が入射することを防止する複数の壁体と、壁体の間に形成された煙流入口と、を有し、壁体が形成される仕切り壁の下面は、煙流入部に流入した煙を開口部から実装部へ流入させるために、開口部に向かうにしたがって上方に向けて傾斜する傾斜面となっているものである。   The photoelectric smoke detector according to the present invention has a smoke detector and a fire discriminator for judging a fire based on an output signal of the smoke detector, and outputs a fire signal when the fire discriminator judges a fire. In the photoelectric smoke detector, the smoke detection unit includes a mounting unit and a smoke inflow unit disposed on the lower side of the mounting unit, and the mounting unit emits light to irradiate light inside the mounting unit. And a light receiving element that receives scattered light emitted from the smoke particles of the smoke detector, and the smoke inflow part has a partition wall having an opening for communicating with the mounting part, A plurality of wall bodies that are erected downward from the lower surface of the partition wall and prevent external light from entering the smoke inflow portion, and a smoke inflow port formed between the wall bodies, and the wall body The lower surface of the formed partition wall is directed toward the opening in order to allow the smoke flowing into the smoke inflow portion to flow into the mounting portion from the opening. It is therefore intended that an inclined surface inclined upward.

また、本発明に係る光電式煙感知器は、仕切り壁の傾斜面に沿った煙が、実装部に形成された煙検出部に誘導されるように、傾斜面の角度と開口部の内径とが設定されるものである。   In addition, the photoelectric smoke detector according to the present invention includes an angle of the inclined surface and an inner diameter of the opening so that the smoke along the inclined surface of the partition wall is guided to the smoke detecting portion formed in the mounting portion. Is set.

本発明においては、検煙部は、発光素子と受光素子が設けられた実装部と煙流入部とが分けられている。また、実装部と煙流入部とは、煙流入部が下側になるように重ねて配置され、開口部で連通されている。このため、煙流入部に流入した湯気は、粒子の質量が大きいため慣性が大きい。よって、流動状態を変化させにくいので、実装部にほとんど流入することなく煙流入部を通過する。一方、煙流入部に流入した煙は、粒子の質量が小さいため慣性が小さい。よって、流動状態を変化させやすいので、開口部を介して実装部に流入する。そして、発光素子から照射された光がこの実装部に流入した煙によって散乱されたときの散乱光を受光素子が受光し、火災判断部が火災を判断する。したがって、検煙部（煙流入部）に湯気が流入しても誤報することなく、火災を判断することができる光電式煙感知器を得ることができる。また、壁体が形成される仕切り壁の下面は、開口部に向かうにしたがって上方に向けて傾斜する傾斜面となっており、煙流入部に流入した煙を傾斜面により開口部へ誘導して実装部に流入させるため、低い風速の煙でも速やかに実装部まで流入させることが可能である。よって、火災の検出性能を高めることができる。   In the present invention, the smoke detecting section is divided into a mounting section provided with a light emitting element and a light receiving element and a smoke inflow section. Further, the mounting portion and the smoke inflow portion are arranged so that the smoke inflow portion is on the lower side, and communicated with each other through the opening. For this reason, the steam flowing into the smoke inflow portion has a large inertia because the mass of the particles is large. Therefore, since it is difficult to change the flow state, it passes through the smoke inflow portion with almost no flow into the mounting portion. On the other hand, the smoke flowing into the smoke inflow portion has a small inertia because the mass of the particles is small. Therefore, since the flow state is easily changed, it flows into the mounting portion through the opening. Then, the light receiving element receives the scattered light when the light emitted from the light emitting element is scattered by the smoke flowing into the mounting part, and the fire determining part determines a fire. Therefore, it is possible to obtain a photoelectric smoke detector that can determine a fire without erroneous reporting even if steam flows into the smoke detector (smoke inlet). In addition, the lower surface of the partition wall on which the wall body is formed is an inclined surface that is inclined upward toward the opening, and the smoke that has flowed into the smoke inflow portion is guided to the opening by the inclined surface. Since the air flows into the mounting portion, it is possible to promptly flow even smoke with a low wind speed to the mounting portion. Therefore, the fire detection performance can be enhanced.

また、仕切り壁の傾斜面に沿った煙が、実装部に形成された煙検出部に誘導されるように、傾斜面の角度と開口部の内径とを設定するようにしたので、煙検出部への煙の誘導を実現でき、更に火災の検出性能を高めることができる。   In addition, since the smoke along the inclined surface of the partition wall is guided to the smoke detecting portion formed in the mounting portion, the angle of the inclined surface and the inner diameter of the opening are set. Smoke can be guided to the fire, and the fire detection performance can be further enhanced.

本発明の実施の形態に係る火災警報器の検煙部を示す縦断面図である。It is a longitudinal cross-sectional view which shows the smoke detection part of the fire alarm which concerns on embodiment of this invention. 本発明の実施の形態に係る火災警報器の検煙部を示す底面図である。It is a bottom view which shows the smoke detection part of the fire alarm which concerns on embodiment of this invention. 本発明の実施の形態に係る火災警報器の検煙部を示す右側面図である。It is a right view which shows the smoke detection part of the fire alarm which concerns on embodiment of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１のＢ−Ｂ断面図である。It is BB sectional drawing of FIG. 本発明の実施の形態に係る火災警報器の検煙部を示す縦断面図である。It is a longitudinal cross-sectional view which shows the smoke detection part of the fire alarm which concerns on embodiment of this invention.

実施の形態．
以下の実施の形態では、光電式煙感知器の構成に押し釦スイッチやブザー等の警報装置を設けた火災警報器に本発明を実施した場合について説明する。 Embodiment.
In the following embodiments, a case will be described in which the present invention is applied to a fire alarm device in which an alarm device such as a push button switch or a buzzer is provided in the configuration of the photoelectric smoke detector.

図１は本発明の実施の形態に係る火災警報器の検煙部を示す縦断面図、図２はこの検煙部の底面図、図３はこの検煙部の右側面図、図４は図１のＡ−Ａ断面図、及び図５は図１のＢ−Ｂ断面図である。これら図１〜図５は、縮尺を一部異ならせて示している。以下、これら図１〜図５を用いて、本実施の形態に係る火災警報器について説明する。なお、以下の説明では、図１の上下左右方向に合わせて説明する。   1 is a longitudinal sectional view showing a smoke detector of a fire alarm device according to an embodiment of the present invention, FIG. 2 is a bottom view of the smoke detector, FIG. 3 is a right side view of the smoke detector, and FIG. AA sectional view of FIG. 1 and FIG. 5 are BB sectional views of FIG. These FIG. 1 to FIG. 5 show the scales partially different. Hereinafter, the fire alarm device according to the present embodiment will be described with reference to FIGS. In the following description, description will be made in accordance with the vertical and horizontal directions in FIG.

火災警報器の検煙部１は、煙流入部１０及び実装部２０等から構成されている。煙流入部１０は、略円筒形状をしており、板状の仕切り壁１１及び壁体１２等から構成されている。仕切り壁１１は略円板状を成し、その略中心部には煙流入部１０とその上部に配置された実装部２０とを互いに連通させるための開口部１３が形成されている。また、仕切り壁１１の外縁部には、後述する発光素子ホルダ２６及び受光素子ホルダ２７のそれぞれに対応する位置に、外方に向けて突出する凸部１１ａ及び凸部１１ｂが形成されている。また、仕切り壁１１の下面側の外周部には、複数の例えば略Ｊ字状の壁体１２が所定の間隔を空けて略円環状に立設配置されている。壁体１２は、煙流入部１０へ外光が入射することを防止している。また、各壁体１２間に形成された空間（所定の間隔）は、煙流入部１０に煙が流入するための煙流入口１４となっている。煙流入部１０の下面側開口部は蓋体１６により閉塞されており、煙流入部１０内が暗箱となっている。また、煙流入部１０の側面部には、煙流入口１４から虫が侵入することを防止するため、防虫網（図示せず）が設けられている。   The smoke detector 1 of the fire alarm is composed of a smoke inflow portion 10 and a mounting portion 20. The smoke inflow portion 10 has a substantially cylindrical shape, and includes a plate-like partition wall 11 and a wall body 12. The partition wall 11 has a substantially disk shape, and an opening 13 is formed at a substantially central portion thereof for allowing the smoke inflow portion 10 and the mounting portion 20 disposed above the smoke inflow portion 10 to communicate with each other. Further, on the outer edge portion of the partition wall 11, convex portions 11 a and convex portions 11 b projecting outward are formed at positions corresponding to a light emitting element holder 26 and a light receiving element holder 27 described later. A plurality of, for example, substantially J-shaped wall bodies 12 are erected and arranged in a substantially annular shape at a predetermined interval on the outer peripheral portion on the lower surface side of the partition wall 11. The wall body 12 prevents external light from entering the smoke inflow portion 10. A space (predetermined interval) formed between the wall bodies 12 serves as a smoke inlet 14 for smoke to flow into the smoke inflow portion 10. The opening on the lower surface side of the smoke inflow portion 10 is closed by the lid body 16, and the inside of the smoke inflow portion 10 is a dark box. In addition, an insect net (not shown) is provided on the side surface of the smoke inflow portion 10 in order to prevent insects from entering from the smoke inlet 14.

また、複数の壁体１２が下方に向けて立設配置されている仕切り壁１１の下面は、煙流入口１４から煙流入部１０に流入した煙を開口部１３へと誘導するための傾斜面１３ａとなっている。傾斜面１３ａは、仕切り壁１１の外周側から内側の開口部１３に向かうにしたがって上方に傾斜する傾斜面となっている。この傾斜面１３ａの角度及び開口部１３の内径は、傾斜面１３ａに沿って開口部１３へ向かった煙が、実装部２０内の後述の煙検出部２５（図４参照）へと誘導されるように設定されている。   In addition, the lower surface of the partition wall 11 in which the plurality of wall bodies 12 are erected downward is an inclined surface for guiding the smoke flowing into the smoke inflow portion 10 from the smoke inlet 14 to the opening 13. 13a. The inclined surface 13 a is an inclined surface that inclines upward from the outer peripheral side of the partition wall 11 toward the inner opening 13. The angle of the inclined surface 13a and the inner diameter of the opening 13 are such that the smoke directed toward the opening 13 along the inclined surface 13a is guided to a smoke detecting unit 25 (see FIG. 4) described later in the mounting unit 20. Is set to

煙流入部１０の上方には、実装部２０が設けられている。この実装部２０は、光学台２１、発光素子２２、受光素子２３及び遮光部材２４等から構成されている。光学台２１は下部が開口した略円筒形状となっており、上部には回路基板２が取り付けられ、下部開口には煙流入部１０の仕切り壁１１が取り付けられている。光学台２１の上面は一部開口しているが、その開口は回路基板２によって閉塞されており、光学台２１の内部は暗箱となっている。このように暗箱とされた実装部２０内に、発光素子２２及び受光素子２３が実装されている。なお、煙流入部１０及び実装部２０とは、仕切り壁１１に設けられた開口部１３を介して互いに連通している。また、本実施の形態では、実装部２０の高さ寸法が煙流入部１０の高さ寸法よりも大きくなっている。   A mounting portion 20 is provided above the smoke inflow portion 10. The mounting unit 20 includes an optical bench 21, a light emitting element 22, a light receiving element 23, a light shielding member 24, and the like. The optical bench 21 has a substantially cylindrical shape with an opening at the bottom, the circuit board 2 is attached to the top, and the partition wall 11 of the smoke inflow portion 10 is attached to the bottom opening. Although the upper surface of the optical bench 21 is partially opened, the opening is closed by the circuit board 2 and the inside of the optical bench 21 is a dark box. Thus, the light emitting element 22 and the light receiving element 23 are mounted in the mounting part 20 made into a dark box. Note that the smoke inflow portion 10 and the mounting portion 20 communicate with each other via an opening 13 provided in the partition wall 11. Further, in the present embodiment, the height dimension of the mounting portion 20 is larger than the height dimension of the smoke inflow portion 10.

発光素子２２及び受光素子２３は、光学台２１に設けられた発光素子ホルダ２６及び受光素子ホルダ２７によって保持され、光学台２１内に実装されている。発光素子ホルダ２６及び受光素子ホルダ２７は、光学台２１の外周部から内側に向けて突出するように設けられている。発光素子ホルダ２６は、例えばフック等からなる一対の保持部材２６ａ（図４参照）を有し、発光素子２２は、これら保持部材２６ａに挟持されて発光素子ホルダ２６に保持されている。また、発光素子２２のリード部は、略直角に上方に向けて曲げられており、発光素子ホルダ２６に形成された貫通孔２６ｂを通過した後、光学台２１から上方に突出している。   The light emitting element 22 and the light receiving element 23 are held by a light emitting element holder 26 and a light receiving element holder 27 provided on the optical bench 21, and are mounted in the optical bench 21. The light emitting element holder 26 and the light receiving element holder 27 are provided so as to protrude inward from the outer peripheral portion of the optical bench 21. The light emitting element holder 26 has a pair of holding members 26a (see FIG. 4) made of hooks or the like, for example, and the light emitting element 22 is held between the holding members 26a and held by the light emitting element holder 26. In addition, the lead portion of the light emitting element 22 is bent upward at a substantially right angle, and protrudes upward from the optical bench 21 after passing through a through hole 26 b formed in the light emitting element holder 26.

受光素子２３は、シールドケース２８内に設けられ、このシールドケース２８と共に受光素子ホルダ２７に収納されている。シールドケース２８は略角筒形状をしており、その上部及び受光素子２３の受光部と対向する範囲は開口している。このシールドケース２８内には、背面から内方に向けて突出する例えば押さえ片等からなる保持部材２８ａが設けられており、受光素子２３は、この保持部材２８ａとシールドケース２８の内側面とに挟持されてシールドケース２８内に配置されている。シールドケース２８の上端の一部は上方に向けて延びる凸部２８ｂとなっており、この凸部２８ｂを回路基板２に形成された開口部に挿通させて半田付けすることによって、シールドケース２８及び受光素子２３が回路基板２に固定されている。   The light receiving element 23 is provided in the shield case 28 and is housed in the light receiving element holder 27 together with the shield case 28. The shield case 28 has a substantially rectangular tube shape, and an upper portion thereof and a range facing the light receiving portion of the light receiving element 23 are open. In the shield case 28, a holding member 28 a made of, for example, a pressing piece that protrudes inward from the back surface is provided. The light receiving element 23 is provided between the holding member 28 a and the inner side surface of the shield case 28. It is sandwiched and arranged in the shield case 28. A part of the upper end of the shield case 28 is formed as a convex portion 28b extending upward. The convex portion 28b is inserted into an opening formed in the circuit board 2 and soldered, whereby the shield case 28 and The light receiving element 23 is fixed to the circuit board 2.

発光素子２２及び受光素子２３は、図４に示すように、光学台２１内に収納された状態において、発光素子２２はその照射範囲２２ｂが光学台２１の略中心部を向くように設けられており、受光素子２３はその受光範囲２３ｂが光学台２１の略中心部を向くように設けられている。また、発光素子２２の光軸２２ａと受光素子２３の光軸２３ａは、側面視において略平行となり、平面視において所定の角度をなし、互いの照射範囲２２ｂ及び受光範囲２３ｂが重なるように設けられている。そして、その重なり合った部分（煙検出部２５）で煙の検出を行う。より詳しくは、発光素子２２から照射された光がこの煙検出部２５に進入する煙によって散乱される光を、受光素子２３は受光する。   As shown in FIG. 4, the light emitting element 22 and the light receiving element 23 are provided so that the irradiation range 22 b of the light emitting element 22 faces the substantially central portion of the optical bench 21 in a state of being housed in the optical bench 21. The light receiving element 23 is provided such that the light receiving range 23 b faces the substantially central portion of the optical bench 21. Further, the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 are substantially parallel in a side view, have a predetermined angle in a plan view, and are provided so that the irradiation range 22b and the light receiving range 23b overlap each other. ing. Then, smoke is detected at the overlapping portion (smoke detection unit 25). More specifically, the light receiving element 23 receives light scattered by the smoke that is emitted from the light emitting element 22 and enters the smoke detection unit 25.

また、発光素子２２の光軸２２ａと受光素子２３の光軸２３ａとのなす角度が鋭角となる側の光学台２１には、下方に向けて突出する遮光部材２４が立設されている。この遮光部材２４の平面視における断面形状は、例えば略六角形状をしており、光学台２１の中心部側の角部を略コ字状に切り欠いた形状となっている。これにより、遮光部材２４には、エッジ部２４ａ及びエッジ部２４ｂが形成されている。エッジ部２４ａは、発光素子２２の照射した光を受光素子２３が直接受光することを防止している。エッジ部２４ｂは、エッジ部２４ａで乱反射した光を受光素子２３が受光することを防止している。   Further, a light shielding member 24 protruding downward is provided on the optical bench 21 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle. The cross-sectional shape of the light shielding member 24 in a plan view is, for example, a substantially hexagonal shape, and is a shape in which a corner on the center side of the optical bench 21 is cut out in a substantially U shape. Thus, the light shielding member 24 is formed with an edge portion 24a and an edge portion 24b. The edge portion 24a prevents the light receiving element 23 from directly receiving the light emitted from the light emitting element 22. The edge portion 24b prevents the light receiving element 23 from receiving the light irregularly reflected by the edge portion 24a.

実装部２０は、回路基板２の下面部に実装されている。この回路基板２には複数の電気部品（図示せず）が実装されており、これら電気部品が火災判別部３を構成する。実装部２０が回路基板２に実装された状態においては、発光素子２２及び受光素子２３と火災判別部３は電気的に接続されている。そして、火災判別部３は、受光素子２３が検出する受光量に基づいて火災が発生したか否かを判別する。受光素子２３が検出する受光量は、例えば電圧等によって火災判別部３に出力される。   The mounting portion 20 is mounted on the lower surface portion of the circuit board 2. A plurality of electrical components (not shown) are mounted on the circuit board 2, and these electrical components constitute a fire determination unit 3. In a state where the mounting unit 20 is mounted on the circuit board 2, the light emitting element 22 and the light receiving element 23 and the fire determination unit 3 are electrically connected. And the fire discrimination | determination part 3 discriminate | determines whether the fire broke out based on the light reception amount which the light receiving element 23 detects. The amount of received light detected by the light receiving element 23 is output to the fire discriminating unit 3 by voltage or the like, for example.

検煙部１及び回路基板２は、煙流入部１０への通気性が確保された筐体（図示せず）内に設けられ、火災警報器を構成する。そして、この火災警報器は、例えば家屋、ビル及びホテルの室内等の監視空間に設置される。火災警報器が監視空間の天井面に取り付けられた状態においては、火災警報器は、図１に示すように、煙流入部１０が下側となって設置される。   The smoke detector 1 and the circuit board 2 are provided in a casing (not shown) in which air permeability to the smoke inflow portion 10 is ensured, and constitute a fire alarm. The fire alarm is installed in a monitoring space such as a house, a building, or a hotel room. In a state where the fire alarm is attached to the ceiling surface of the monitoring space, the fire alarm is installed with the smoke inflow portion 10 on the lower side as shown in FIG.

火災警報器は、例えばリチウム電池である電池３０を駆動源としている。つまり、電池３０は、検煙部１の発光素子２２や回路基板２の火災判別部３等に電源供給する。この電池３０は、回路基板２の側方に設けられ、特に、発光素子２２の光軸２２ａと受光素子２３の光軸２３ａとのなす角度が鋭角となる側の側方に設けられている。また、電池３０を収納する電池収納部は、実装部２０の上面部と側面部の一部を切り欠いて形成された空間を利用して、平面視において実装部２０と電池３０（電池収納部）とが一部重なるように配置されている。これにより、火災警報器を小型化、薄型化することができる。なお、実装部２０の切り欠かれた部分は、外光が入射するのを防止するため、閉塞されている。   The fire alarm device uses a battery 30 which is, for example, a lithium battery as a drive source. That is, the battery 30 supplies power to the light emitting element 22 of the smoke detector 1, the fire determination unit 3 of the circuit board 2, and the like. The battery 30 is provided on the side of the circuit board 2, and in particular, on the side of the side where the angle between the optical axis 22 a of the light emitting element 22 and the optical axis 23 a of the light receiving element 23 is an acute angle. In addition, the battery storage unit that stores the battery 30 uses the space formed by cutting out part of the upper surface part and the side surface part of the mounting part 20, and the mounting part 20 and the battery 30 (battery storage part) in plan view. ) And partly overlap. Thereby, a fire alarm can be reduced in size and thickness. Note that the notched portion of the mounting portion 20 is closed to prevent external light from entering.

なお、電池３０（電池収納部）は、必ずしも本実施の形態に示す位置に設けられる必要はなく、実装部２０の煙検出機能に支障がない部分を切り欠くようにして設けられていればよい。つまり、電池３０（電池収納部）は、実装部２０における発光素子２２の煙検出部２５までの照射範囲２２ｂ及び受光素子２３の前記煙検出部２５までの受光範囲２３ｂを避けた部分を切り欠くように形成すればよい。発光素子２２の光軸２２ａと受光素子２３の光軸２３ａとのなす角度が鋭角となる側は、煙検出部２５が遮光部材２４により隔てられているので、電池３０（電池収納部）を設けることによる実装部２０の煙検出機能への影響が最も少ない場所である。このため、本実施の形態では、発光素子２２の光軸２２ａと受光素子２３の光軸２３ａとのなす角度が鋭角となる側の実装部２０の上面部と側面部の一部を切り欠くようにして、電池３０（電池収納部）を設けている。   In addition, the battery 30 (battery storage part) does not necessarily need to be provided at the position shown in the present embodiment, and may be provided so as to cut out a part that does not hinder the smoke detection function of the mounting part 20. . In other words, the battery 30 (battery storage unit) cuts out the portion of the mounting unit 20 that avoids the irradiation range 22b of the light emitting element 22 to the smoke detection unit 25 and the light receiving range 23b of the light receiving element 23 to the smoke detection unit 25. What is necessary is just to form. On the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle, the smoke detection unit 25 is separated by the light shielding member 24, so a battery 30 (battery storage unit) is provided. This is the place where the influence on the smoke detection function of the mounting unit 20 is minimal. Therefore, in the present embodiment, a part of the upper surface portion and the side surface portion of the mounting portion 20 on the side where the angle formed by the optical axis 22a of the light emitting element 22 and the optical axis 23a of the light receiving element 23 is an acute angle is cut out. Thus, a battery 30 (battery storage part) is provided.

（動作説明）
続いて、本実施の形態に係る火災警報器の動作について説明する。
図６は、本発明の実施の形態に係る火災警報器の検煙部を示す縦断面図である。なお、この図６は図４のＣ−Ｃ断面図となっている。また、図６（ａ）は、検煙部１に煙が流入した状態を示す縦断面図であり、検煙部１内の煙の流れを破線の矢印で示している。また、図６（ｂ）は、検煙部１に湯気が流入した状態を示す縦断面図であり、検煙部１内の湯気の流れを破線の矢印で示している。 (Description of operation)
Next, the operation of the fire alarm device according to the present embodiment will be described.
FIG. 6 is a longitudinal sectional view showing the smoke detector of the fire alarm according to the embodiment of the present invention. 6 is a cross-sectional view taken along the line CC of FIG. FIG. 6A is a longitudinal cross-sectional view showing a state where smoke has flowed into the smoke detector section 1, and the smoke flow in the smoke detector section 1 is indicated by a dashed arrow. FIG. 6B is a longitudinal sectional view showing a state in which steam has flowed into the smoke detector section 1, and the flow of steam in the smoke detector section 1 is indicated by broken arrows.

図６（ａ）に示すように、火災により発生した煙は、監視空間の天井面等に沿って流れ、検煙部１の煙流入部１０に流入する。煙は粒子の質量が小さいため慣性が小さい。よって、流動状態を変化させやすいので、煙流入部１０に流入した煙は、開口部１３を通って実装部２０へ流入する。ここで、煙流入部１０から実装部２０へ至る経路に、遮光部材２４、発光素子２２及び受光素子２３が設けられていないため、煙流入部１０に流入する煙の流れはこれらによって遮られることがない。このため、煙流入部１０への煙流入特性が向上する。なお、遮光部材２４は、必ずしも実装部２０のみに設けられている必要はない。例えば、遮光部材２４の下端を延出し、煙流入部１０の煙流入特性が低下しない範囲で煙流入部１０内に挿入するようにしてもよい。遮光部材２４の下端が煙流入部１０内に挿入するような長さとすることにより、発光素子２２が照射する光を受光素子２３が直接受光することを、より確実に防止することができる。   As shown in FIG. 6A, smoke generated by the fire flows along the ceiling surface of the monitoring space and flows into the smoke inflow section 10 of the smoke detector section 1. Smoke has low inertia because of its small particle mass. Therefore, since the flow state is easily changed, the smoke that has flowed into the smoke inflow portion 10 flows into the mounting portion 20 through the opening portion 13. Here, since the light shielding member 24, the light emitting element 22, and the light receiving element 23 are not provided in the path from the smoke inflow portion 10 to the mounting portion 20, the flow of smoke flowing into the smoke inflow portion 10 is blocked by these. There is no. For this reason, the smoke inflow characteristic to the smoke inflow part 10 improves. The light shielding member 24 is not necessarily provided only on the mounting portion 20. For example, the lower end of the light shielding member 24 may be extended and inserted into the smoke inflow portion 10 as long as the smoke inflow characteristics of the smoke inflow portion 10 do not deteriorate. By setting the length so that the lower end of the light shielding member 24 is inserted into the smoke inflow portion 10, it is possible to more reliably prevent the light receiving element 23 from directly receiving the light emitted by the light emitting element 22.

また、仕切り壁１１の下面が外周側から開口部１３に向かうにしたがって上方に傾斜する傾斜面１３ａとなっているため、煙流入部１０に流入した煙がその傾斜面１３ａによって実装部２０内へと誘導される。従って、低い風速の煙でも速やかに実装部２０内まで流入させることが可能である。   Moreover, since the lower surface of the partition wall 11 becomes the inclined surface 13a which inclines upward as it goes to the opening part 13 from an outer peripheral side, the smoke which flowed into the smoke inflow part 10 in the mounting part 20 by the inclined surface 13a. It is induced. Therefore, it is possible to promptly flow smoke into the mounting portion 20 even with low wind speed smoke.

そして、実装部２０に煙が流入すると、この煙によって発光素子２２の照射した光が散乱する。この散乱光は受光素子２３によって受光される。つまり、受光素子２３の受光量が変化する。そして受光素子２３は、受光量に応じた検出値（電圧等）を火災判別部３に出力する。この検出値に基づいて、火災判別部３は火災が発生したか否かを判別する。火災が発生したと判断すると、火災判別部３は、ＬＥＤ等の発光素子やブザー等の警報装置（図示せず）によって火災が発生したことを周囲に警報する。なお、本実施の形態では実装部２０の高さ寸法が煙流入部１０の高さ寸法よりも大きくなっているので、煙流入部１０に流入した煙は実装部２０へ流入しやすくなっている。このため、火災判別部３（火災警報器）は、速やかに火災を判断することができる。   And when smoke flows into the mounting part 20, the light irradiated by the light emitting element 22 is scattered by the smoke. This scattered light is received by the light receiving element 23. That is, the amount of light received by the light receiving element 23 changes. The light receiving element 23 outputs a detection value (voltage or the like) corresponding to the amount of received light to the fire determination unit 3. Based on this detection value, the fire determination unit 3 determines whether or not a fire has occurred. When it is determined that a fire has occurred, the fire determination unit 3 warns the surroundings that a fire has occurred by a light emitting element such as an LED or an alarm device (not shown) such as a buzzer. In the present embodiment, since the height dimension of the mounting portion 20 is larger than the height dimension of the smoke inflow portion 10, the smoke that has flowed into the smoke inflow portion 10 easily flows into the mounting portion 20. . For this reason, the fire discriminating unit 3 (fire alarm device) can quickly determine a fire.

一方、図６（ｂ）に示すように、湯気は粒子の質量が大きいため慣性が大きい。よって、流動状態を変化させにくいので、煙流入部１０に流入した湯気は、ほとんど実装部２０に流入することなく煙流入部１０を通過する。このため、実装部２０内では、発光素子２２の照射した光が湯気によって散乱することはない（又は少ない）。したがって、煙流入部１０（検煙部１）に湯気が流入しても、火災判別部３は（火災警報器）火災であると誤判断することがない。   On the other hand, as shown in FIG. 6B, steam has a large inertia because the mass of the particles is large. Therefore, since it is difficult to change the flow state, the steam that has flowed into the smoke inflow portion 10 passes through the smoke inflow portion 10 almost without flowing into the mounting portion 20. For this reason, in the mounting part 20, the light irradiated by the light emitting element 22 is not scattered (or less) by steam. Therefore, even if steam flows into the smoke inflow section 10 (smoke detection section 1), the fire determination section 3 (fire alarm) does not erroneously determine that there is a fire.

このように、本実施の形態では、検煙部１を、発光素子２２及び受光素子２３を実装する実装部２０と、煙流入部１０とに分け、且つ、実装部２０を煙流入部１０の上部に配置するようにした。このため、実装部２０の下部側の煙流入部１０に湯気が流入しても、その上部側に配置した実装部２０には湯気が流入しない。よって、煙流入部１０に流入した湯気により実装部２０が誤報するのを防止できる火災警報器を得ることができる。   As described above, in the present embodiment, the smoke detector 1 is divided into the mounting part 20 for mounting the light emitting element 22 and the light receiving element 23 and the smoke inflow part 10, and the mounting part 20 is divided into the smoke inflow part 10. It was arranged at the top. For this reason, even if steam flows into the smoke inflow part 10 on the lower side of the mounting part 20, steam does not flow into the mounting part 20 arranged on the upper side. Therefore, it is possible to obtain a fire alarm capable of preventing the mounting unit 20 from misreporting due to steam flowing into the smoke inflow unit 10.

また、実装部２０の高さ寸法が煙流入部１０の高さ寸法よりも大きくなっているので、煙流入部１０に流入した煙は実装部２０へ流入しやすくなっている。このため、火災判別部３（火災警報器）は、精度よく火災を判断することができる。   Moreover, since the height dimension of the mounting part 20 is larger than the height dimension of the smoke inflow part 10, the smoke that has flowed into the smoke inflow part 10 easily flows into the mounting part 20. For this reason, the fire discrimination | determination part 3 (fire alarm device) can judge a fire accurately.

また、仕切り壁１１の下面に、煙流入部１０に流入した煙を実装部２０内へと誘導する傾斜面１３ａを設けたため、その傾斜面１３ａによって煙を実装部２０へと誘導することができ、低い風速の煙でも速やかに実装部２０まで流入させることが可能となる。よって、火災の検出性能を高めることができる。   Further, since the inclined surface 13a for guiding the smoke flowing into the smoke inflow portion 10 into the mounting portion 20 is provided on the lower surface of the partition wall 11, the smoke can be guided to the mounting portion 20 by the inclined surface 13a. Thus, it is possible to promptly flow into the mounting portion 20 even with low wind speed smoke. Therefore, the fire detection performance can be enhanced.

また、その傾斜面１３ａの角度及び開口部１３の内径は、傾斜面１３ａに沿って開口部１３へと向かった煙が、実装部２０内の煙検出部２５（図４参照）に誘導されるように設定されているため、煙検出部２５への煙の誘導を実現でき、更に火災の検出性能を高めることができる。   In addition, the angle of the inclined surface 13a and the inner diameter of the opening 13 are such that smoke directed toward the opening 13 along the inclined surface 13a is guided to the smoke detection unit 25 (see FIG. 4) in the mounting unit 20. Therefore, it is possible to realize the induction of smoke to the smoke detection unit 25 and to further improve the fire detection performance.

さらに、火災警報器が天井面と略直交する側壁面に向きを変えて設置されても、煙と湯気はそれぞれ図６（ａ），（ｂ）の通りに流動するので、天井面取付時と同様な効果が得られる。   Furthermore, even if the fire alarm is installed on the side wall surface that is substantially orthogonal to the ceiling surface, the smoke and steam flow as shown in FIGS. 6 (a) and 6 (b). Similar effects can be obtained.

なお、本実施の形態では散乱光式の火災警報器に本発明を実施したが、減光式の火災警報器に本発明を実施してもよい。また、火災感知器に本発明を実施することももちろん可能である。   In the present embodiment, the present invention is applied to a scattered light type fire alarm, but the present invention may be applied to a dimming type fire alarm. It is of course possible to implement the present invention on a fire detector.

１ 検煙部、２ 回路基板、３ 火災判別部、１０ 煙流入部、１１ 板部材、１１ａ 凸部、１１ｂ 凸部、１２ 壁体、１３ 開口部、１３ａ 傾斜面、１４ 煙流入口、１６ 蓋体、２０ 実装部、２１ 光学台、２２ 発光素子、２２ａ 光軸、２２ｂ 照射範囲、２３ 受光素子、２３ａ 光軸、２３ｂ 照射範囲、２４ 遮光部材、２４ａ エッジ部、２４ｂ エッジ部、２５ 煙検出部、２６ 発光素子ホルダ、２６ａ 保持部材、２６ｂ 貫通孔、２７ 受光素子ホルダ、２８ シールドケース、２８ａ 保持部材、２８ｂ 凸部、３０ 電池。   DESCRIPTION OF SYMBOLS 1 Smoke detection part, 2 circuit board, 3 fire discrimination part, 10 smoke inflow part, 11 board member, 11a convex part, 11b convex part, 12 wall body, 13 opening part, 13a inclined surface, 14 smoke inflow port, 16 lid Body, 20 mounting part, 21 optical stand, 22 light emitting element, 22a optical axis, 22b irradiation range, 23 light receiving element, 23a optical axis, 23b irradiation range, 24 light shielding member, 24a edge part, 24b edge part, 25 smoke detection part , 26 Light emitting element holder, 26a Holding member, 26b Through hole, 27 Light receiving element holder, 28 Shield case, 28a Holding member, 28b Protruding part, 30 Battery.

Claims (2)

検煙部と、該検煙部の出力信号に基づいて火災を判断する火災判別部と、を有し、前記火災判別部が火災と判断すると火災信号を出力する光電式煙感知器において、
前記検煙部は、実装部と、該実装部の下側に重ねて配置された煙流入部と、を備え、
前記実装部は、
該実装部の内部に光を照射する発光素子と、該発光素子から照射され、前記検煙部の煙粒子により生じる散乱光を受光する受光素子と、を有し、
前記煙流入部は、
前記実装部と連通するための開口部を有する仕切り壁と、該仕切り壁の下面から下方に立設され、前記煙流入部に外光が入射することを防止する複数の壁体と、該壁体の間に形成された煙流入口と、を有し、
前記壁体が形成される前記仕切り壁の下面は、前記煙流入部に流入した煙を前記開口部から前記実装部へ流入させるために、前記開口部に向かうにしたがって上方に向けて傾斜する傾斜面となっていることを特徴とする光電式煙感知器。 In a photoelectric smoke detector that has a smoke detector and a fire discriminator that judges a fire based on an output signal of the smoke detector, and outputs a fire signal when the fire discriminator judges a fire,
The smoke detector includes a mounting portion, and a smoke inflow portion disposed on the lower side of the mounting portion,
The mounting part is
A light-emitting element that irradiates light inside the mounting part; and a light-receiving element that receives the scattered light that is emitted from the light-emitting element and is generated by the smoke particles of the smoke detector part,
The smoke inlet is
A partition wall having an opening for communicating with the mounting portion, a plurality of wall bodies standing downward from a lower surface of the partition wall to prevent external light from entering the smoke inflow portion, and the wall A smoke inlet formed between the bodies,
The lower surface of the partition wall on which the wall body is formed is inclined so as to incline upward toward the opening in order to allow smoke flowing into the smoke inflow portion to flow into the mounting portion from the opening. A photoelectric smoke detector characterized by a surface. 前記仕切り壁の前記傾斜面に沿った煙が、前記実装部に形成された煙検出部に誘導されるように、前記傾斜面の角度と前記開口部の内径とが設定されることを特徴とする請求項１に記載の光電式煙感知器。   The angle of the inclined surface and the inner diameter of the opening are set so that smoke along the inclined surface of the partition wall is guided to the smoke detection unit formed in the mounting unit. The photoelectric smoke detector according to claim 1.
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CN2009101619770A CN101713733B (en) 2008-10-01 2009-09-10 Photoelectric smoke sensor
TW098131614A TWI442346B (en) 2008-10-01 2009-09-18 Photoelectric smoke detector
US12/566,269 US8232885B2 (en) 2008-10-01 2009-09-24 Photoelectric smoke detector
EP09252336A EP2172916B1 (en) 2008-10-01 2009-10-01 Photoelectric smoke detector

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WO2016009460A1 (en) * 2014-07-14 2016-01-21 日本フェンオール株式会社 Photoelectric smoke sensor

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