JP2010020471A - Photoelectric type smoke detector - Google Patents

Photoelectric type smoke detector Download PDF

Info

Publication number
JP2010020471A
JP2010020471A JP2008179315A JP2008179315A JP2010020471A JP 2010020471 A JP2010020471 A JP 2010020471A JP 2008179315 A JP2008179315 A JP 2008179315A JP 2008179315 A JP2008179315 A JP 2008179315A JP 2010020471 A JP2010020471 A JP 2010020471A
Authority
JP
Japan
Prior art keywords
housing
light
outside
smoke
pocket portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2008179315A
Other languages
Japanese (ja)
Other versions
JP5133157B2 (en
Inventor
Shuhei Kuroda
修平 黒田
Hironori Tatsumi
裕紀 辰巳
Mitsuteru Nishida
光輝 西田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Cosmos Electric Co Ltd
Original Assignee
New Cosmos Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Cosmos Electric Co Ltd filed Critical New Cosmos Electric Co Ltd
Priority to JP2008179315A priority Critical patent/JP5133157B2/en
Publication of JP2010020471A publication Critical patent/JP2010020471A/en
Application granted granted Critical
Publication of JP5133157B2 publication Critical patent/JP5133157B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric type smoke detector in which false detection is hardly caused by intrusion of dust etc. <P>SOLUTION: The smoke detector includes: a housing 21 provided with a wall portion 23 for making smoke flowed therein from outside and for shading a light from the outside; a light emitting unit 25 for radiating a light into inside of the housing 21; a light receiving unit 26 for detecting scattered light caused by flow in smoke; a pocket portion 23P to be disposed on at least a part of inner surface of a plurality of wall portions so as to catch dust intruded in the housing 21; and an air flow guiding mechanism G for guiding air flow so that the air flow flowed into the housing 21 from the outside bypasses the pocket portion 23P and at least a part of the air flow to be exhausted to the outside from the inside of the housing 21 flows along a bottom surface of the pocket portion 23P. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、外部からの煙を流入させると共に外部からの光を遮断する複数の壁部を備えたハウジングと、ハウジングの内部に光を照射する発光部と、ハウジングの内部に流入した煙による散乱光を検知する受光部を備えた光電式煙感知器に関する。   The present invention relates to a housing having a plurality of wall portions that allow external smoke to flow in and block external light, a light emitting portion that irradiates light inside the housing, and scattering by smoke flowing into the housing. The present invention relates to a photoelectric smoke detector provided with a light receiving portion for detecting light.

この種の光電式煙感知器に関連する先行技術文献情報として下記に示す特許文献１がある。この特許文献１に記された光電式煙感知器は、煙がハウジング内に進入した場合には、煙によって形成される散乱光を受光部によって検出することで、煙の感知が可能となる。外部から進入する光による誤検知を防ぐために、ハウジングには、外部からの煙を流入させると共に外部からの光を遮断する複数のラビリンス状の壁部が備えられている。また、虫の進入による誤検知を防ぐために壁部には防虫網も設置されている。   As prior art document information related to this type of photoelectric smoke detector, there is Patent Document 1 shown below. The photoelectric smoke detector described in Patent Document 1 can detect smoke by detecting scattered light formed by smoke using a light receiving unit when smoke enters the housing. In order to prevent erroneous detection due to light entering from the outside, the housing is provided with a plurality of labyrinth-like walls that allow smoke from the outside to flow in and block light from the outside. In addition, an insect screen is also installed on the wall to prevent false detection due to insect entry.

特開平９−２３１４８５号公報（請求項１、００１３段落、図１、図４）JP-A-9-231485 (Claim 1, paragraph 0013, FIG. 1, FIG. 4)

しかし、特許文献１に記された光電式煙感知器では、ラビリンス状の壁部や防虫網の目の間から時として細かな埃が進入して散乱光を形成するためにやはり誤検知が生じる場合があった。   However, in the photoelectric smoke detector described in Patent Document 1, since fine dust sometimes enters between the labyrinth-like wall portion and the insect screen mesh to form scattered light, false detection still occurs. There was a case.

そこで、本発明の目的は、上に例示した従来技術による光電式煙感知器の持つ欠点に鑑み、埃などの進入による誤検知が生じ難い光電式煙感知器を提供することにある。   Accordingly, an object of the present invention is to provide a photoelectric smoke detector that is unlikely to be erroneously detected due to the entry of dust or the like in view of the drawbacks of the conventional photoelectric smoke detector exemplified above.

本発明の第１の特徴構成を有する光電式煙感知器は、
外部からの煙を流入させると共に外部からの光を遮断する複数の壁部を備えたハウジングと、
前記ハウジングの内部に光を照射する発光部と、
前記ハウジングの内部に流入した煙による散乱光を検知する受光部と、
前記ハウジング内に進入した埃を捕捉するべく前記複数の壁部の内面の少なくとも一部に配置されたポケット部と、を備え、さらに、
外部から前記ハウジングの内部に流入する気流は前記ポケット部を迂回し、前記複数の壁部の間から前記ハウジングの外部に排出される気流の少なくとも一部は前記ポケット部の底面に沿って流れるように気流を案内する気流案内機構が設けられている点にある。 The photoelectric smoke detector having the first characteristic configuration of the present invention is:
A housing having a plurality of walls that allow smoke from the outside to flow in and block light from the outside;
A light emitting unit for irradiating light inside the housing;
A light receiving unit for detecting scattered light from smoke flowing into the housing;
A pocket portion disposed on at least a part of the inner surfaces of the plurality of wall portions to capture dust that has entered the housing, and
Airflow flowing into the housing from the outside bypasses the pocket portion, and at least part of the airflow discharged to the outside of the housing from between the plurality of wall portions flows along the bottom surface of the pocket portion. Is provided with an airflow guide mechanism for guiding the airflow.

本発明の第１の特徴構成による光電式煙感知器では、埃がハウジング内に進入しても、これらの埃は壁部の内面に配置されたポケット部によって捕捉される。また、外部からハウジングの内部に流入する気流は、気流案内機構によって、ポケット部の底面を迂回するように案内されるので、ハウジングに進入する気流によって埃がハウジングの内部で舞い上がり誤検出を引き起こす虞が抑制される。しかも、気流案内機構の別の効果によって、複数の壁部の間からハウジングの外部に排出される気流の少なくとも一部が、ポケット部の底面に沿って流れるように案内されて、ポケット部に捕捉されている埃をアクティブに排出する作用を引き起こす。したがって、ポケット部に蓄積される埃の量が常に少量に維持され易くなり、埃の舞い上がりによる誤検出の虞がさらに抑制される。   In the photoelectric smoke sensor according to the first characteristic configuration of the present invention, even if dust enters the housing, the dust is captured by the pocket portion disposed on the inner surface of the wall portion. Further, since the airflow flowing into the housing from the outside is guided by the airflow guiding mechanism so as to bypass the bottom surface of the pocket portion, dust may rise inside the housing due to the airflow entering the housing and cause false detection. Is suppressed. In addition, due to another effect of the air flow guide mechanism, at least a part of the air flow discharged from between the plurality of wall portions to the outside of the housing is guided to flow along the bottom surface of the pocket portion, and is captured in the pocket portion. Causes the active dust to be discharged. Therefore, the amount of dust accumulated in the pocket portion is always easily kept small, and the possibility of erroneous detection due to dust rising is further suppressed.

本発明の他の特徴構成は、前記ポケット部を構成する前記壁部の、前記ハウジングの内部から外部に向かって排出される気流に関して最も下流側の端部が前記ハウジングの外周面に対して鋭角状に延設されている点にある。   According to another feature of the present invention, the downstream end of the wall portion constituting the pocket portion with respect to the airflow discharged from the inside of the housing toward the outside is an acute angle with respect to the outer peripheral surface of the housing. It is in the point extended in the shape.

本構成であれば、ハウジングから排出される気流は、ハウジングの外周面に対して鋭角状に延設された壁部材の下流側の端部に沿って、スムースにハウジングから排出される。したがって、ポケット部に捕捉されている埃もこの気流によって確実に連行される。因みに、壁部の下流側の端部が、ハウジングの外周面に対して垂直または鈍角状に延設されていれば、ハウジングから排出される気流は、前記下流側の端部によって乱流化または渦流化してハウジングの内部に滞留する傾向が生じることが予測される。   If it is this structure, the airflow discharged | emitted from a housing will be discharged | emitted from a housing smoothly along the downstream edge part of the wall member extended in acute angle shape with respect to the outer peripheral surface of a housing. Therefore, the dust trapped in the pocket portion is also reliably carried by this air flow. Incidentally, if the downstream end portion of the wall portion extends perpendicularly or obtusely with respect to the outer peripheral surface of the housing, the airflow discharged from the housing is turbulent or A tendency to swirl and stay inside the housing is expected.

本発明の他の特徴構成は、前記発光部の軸心と前記受光部の軸心とを含む平面が建物の壁面に沿った設置状態において、前記ポケット部及び前記気流案内機構が前記ハウジング内部の下方に位置するように構成されている点にある。   In another aspect of the present invention, the pocket portion and the airflow guide mechanism are disposed inside the housing when a plane including the axis of the light emitting unit and the axis of the light receiving unit is installed along the wall surface of the building. It exists in the point comprised so that it may be located below.

本構成であれば、ハウジング内部に進入し、ハウジング内部で自重によって次第に下方に沈降する埃の大半をポケット部で捕獲することができ、また、捕獲された埃の舞い上がりも気流案内機構によって確実に抑制でき易い。   With this configuration, most of the dust that enters the housing and gradually settles downward due to its own weight inside the housing can be captured by the pocket portion, and the rising of the captured dust is reliably ensured by the airflow guide mechanism. Easy to suppress.

以下に、本発明に係る光電式煙感知器の一実施形態について図面を参照して説明する。ここでは、本発明を最も一般的な屋内の垂直壁面に壁掛け式に取り付けて用いることを想定して作られた火災警報器１の煙感知部２に適用した場合について説明する。   Hereinafter, an embodiment of a photoelectric smoke detector according to the present invention will be described with reference to the drawings. Here, a case will be described in which the present invention is applied to the smoke detector 2 of the fire alarm device 1 which is assumed to be used by being mounted on the most common indoor vertical wall surface in a wall-mounted manner.

ここで例示する火災警報器１は、図１（ａ）と図１（ｂ）に示すように、煙を感知する煙感知部２と、煙の感知を音声やブザー等の警報音によって報知する警報スピーカ部３と、同感知をＬＥＤ等による光の点灯または点滅によって報知する警報ランプ４とを備える。煙感知部２は円筒状のハウジング２１を備える。火災警報器１は、煙感知部２が煙を感知した時に、例えば、煙の濃度が予め設定した閾値より高いか低いかを判断し、煙の濃度が閾値を超えている場合に火災と判定して、警報スピーカ３及び警報ランプ４を作動させる。作動した警報スピーカ３及び警報ランプ４は、警報停止ボタン５を操作することにより停止させることができる。火災警報器１の背面には、火災警報器１を壁材等に固定する取り付け部（不図示）や、火災警報器１を駆動させる電池を収納する電池収納部（不図示）等が設けてある。   The fire alarm device 1 exemplified here, as shown in FIGS. 1A and 1B, notifies the smoke detection unit 2 that detects smoke, and the detection of smoke by an alarm sound such as voice or buzzer. An alarm speaker unit 3 and an alarm lamp 4 for notifying the detection by lighting or blinking of light by an LED or the like are provided. The smoke detection unit 2 includes a cylindrical housing 21. When the smoke detector 2 detects smoke, the fire alarm 1 determines, for example, whether the smoke concentration is higher or lower than a preset threshold value, and determines that a fire occurs when the smoke concentration exceeds the threshold value. Then, the alarm speaker 3 and the alarm lamp 4 are activated. The activated alarm speaker 3 and alarm lamp 4 can be stopped by operating the alarm stop button 5. On the back of the fire alarm 1, there are provided an attachment part (not shown) for fixing the fire alarm 1 to a wall material, a battery storage part (not shown) for storing a battery for driving the fire alarm 1, etc. is there.

図２に示すように、ハウジング２１の内部には煙を感知する煙感知室２２が設けられている。ハウジング２１には、複数の鉤状の壁部２３が煙感知室２２の周りを取り囲むように設けてある。これらの鉤状の壁部２３は、クランク状などの間隙部を介して多数並置されることで、外部の光が煙感知室２２に進入しないように遮断し、且つ、外部からの煙の流入を許すラビリンス構造を形成している。また、図１（ｂ）に示すように、壁部２３の外側には、煙感知室２２に虫等が入り込むことによる誤検出を防止するための防虫網２４が設けてある。   As shown in FIG. 2, a smoke detection chamber 22 that detects smoke is provided inside the housing 21. The housing 21 is provided with a plurality of bowl-shaped walls 23 so as to surround the smoke detection chamber 22. A large number of these wall-like wall portions 23 are juxtaposed via a gap portion such as a crank shape, so that external light does not enter the smoke sensing chamber 22 and smoke flows from the outside. The labyrinth structure which permits is formed. As shown in FIG. 1B, an insect screen 24 is provided outside the wall portion 23 to prevent erroneous detection due to insects entering the smoke sensing chamber 22.

ハウジング２１の内部には、煙感知室２２に近赤外線等の光を照射する発光部２５と、煙感知室２２に流入した煙による散乱光を検知する受光部２６とが設けられている。発光部２５は、光源としての発光ダイオード等の発光素子２５Ｄ、及び、発光素子２５Ｄの前面に配置された集光レンズ２５Ｌを備える。受光部２６は、フォトダイオード等の受光素子２６Ｄ、及び、受光素子２６Ｄの前面に配置された集光レンズ２６Ｌを備える。   Inside the housing 21, there are provided a light emitting unit 25 that irradiates the smoke sensing chamber 22 with light such as near infrared rays, and a light receiving unit 26 that detects scattered light caused by smoke flowing into the smoke sensing chamber 22. The light emitting unit 25 includes a light emitting element 25D such as a light emitting diode as a light source, and a condenser lens 25L disposed in front of the light emitting element 25D. The light receiving unit 26 includes a light receiving element 26D such as a photodiode, and a condenser lens 26L disposed in front of the light receiving element 26D.

さらに、発光部２５から照射される光の一部を、主に煙検知領域２２Ａに向けて反射する反射板２７が、発光部２５に対して対向配置されている。反射板２７は矩形の樹脂面を２０００番のコンパウンドで研磨することで反射率の高い鏡面状にしたものである。   Further, a reflection plate 27 that reflects part of the light emitted from the light emitting unit 25 mainly toward the smoke detection region 22 </ b> A is disposed to face the light emitting unit 25. The reflecting plate 27 is a mirror surface having a high reflectivity by polishing a rectangular resin surface with a No. 2000 compound.

発光部２５は発光素子２５Ｄ及び集光レンズ２５Ｌの光軸が略水平となるように配置されている。受光部２６は受光素子２６Ｄ及び集光レンズ２６Ｌの光軸が略鉛直となるようにハウジング２１の内部の最上部に下向き姿勢で配置されている。発光部２５と受光部２６の光軸どうしは煙感知室２２の略中央で約９０°で交差する。反射板２７の中心は発光部２５の光軸上に配置されているが、その反射面は厳密には水平方向よりも僅かに（０．５°〜５°の角度で）下方に向けられているので、反射板２７と受光部２６の光軸どうしは、煙感知室２２の中央よりも少し下方で交差する。煙感知部２は、これらの交差地点を中心として広がる煙検知領域２２Ａに煙が進入した際に生じる散乱光を検出することで煙の存在を感知する。   The light emitting unit 25 is arranged so that the optical axes of the light emitting element 25D and the condenser lens 25L are substantially horizontal. The light receiving unit 26 is disposed in a downward posture on the uppermost part inside the housing 21 so that the optical axes of the light receiving element 26D and the condenser lens 26L are substantially vertical. The optical axes of the light emitting unit 25 and the light receiving unit 26 intersect each other at about 90 ° at the approximate center of the smoke sensing chamber 22. The center of the reflecting plate 27 is disposed on the optical axis of the light emitting unit 25, but its reflecting surface is strictly directed downward (at an angle of 0.5 ° to 5 °) slightly from the horizontal direction. Therefore, the optical axes of the reflecting plate 27 and the light receiving unit 26 intersect slightly below the center of the smoke sensing chamber 22. The smoke detector 2 detects the presence of smoke by detecting scattered light generated when smoke enters the smoke detection area 22A that spreads around these intersections.

ところで、本実施形態のように壁掛け式として用いる場合、すなわち、発光部２５の軸心と受光部２６の軸心とを含む平面が建物の垂直壁面に略沿った設置状態では、埃は上方の間隙部からハウジング２１の内部に侵入し易い。そこで、上述したように、受光素子２６を上方に設けることにより、煙感知室２２の内部への埃の侵入を抑制している。また、受光素子２６の受光面を下方に向けることにより、埃が受光面に堆積することを防止している。   By the way, when used as a wall-hanging type as in the present embodiment, that is, in a state where the plane including the axis of the light emitting unit 25 and the axis of the light receiving unit 26 is substantially along the vertical wall surface of the building, It is easy to enter the inside of the housing 21 from the gap. Therefore, as described above, by providing the light receiving element 26 above, entry of dust into the smoke sensing chamber 22 is suppressed. Further, the light receiving surface of the light receiving element 26 is directed downward to prevent dust from being deposited on the light receiving surface.

前述した鉤状の壁部２３のうち、煙感知室２２の下半分に位置するものの大半は、図３に示すように、ハウジング２１の外周に沿って延びた壁本体３４、壁本体３４の時計方向端部から内径方向に延設された第１延長部３５、壁本体３４の反時計方向端部から内径方向に延設された第２延長部３６を有する。第１延長部３５はハウジング２１の外周面に対して約４５°の傾斜姿勢で延設されている。第２延長部３６は、さらに、壁本体３４の反時計方向端部から内径方向に略直角に延びた短い基端部３６ａと、基端部３６ａから約３０°の角度で図の右側に傾斜して延びた中間部３６ｂと、中間部３６ｂの先端から左右に直角に延びた傾斜したフランジ状部３６ｃとからなる。   As shown in FIG. 3, most of the wall-like wall portions 23 described above located in the lower half of the smoke sensing chamber 22 are a wall main body 34 extending along the outer periphery of the housing 21, and a clock of the wall main body 34. The first extension 35 extends in the inner diameter direction from the direction end, and the second extension 36 extends in the inner diameter direction from the counterclockwise end of the wall body 34. The first extension 35 extends in an inclined posture of about 45 ° with respect to the outer peripheral surface of the housing 21. The second extension 36 is further inclined to the right side of the drawing at an angle of about 30 ° from the base end 36a and a short base end 36a extending substantially perpendicular to the inner diameter direction from the counterclockwise end of the wall body 34. The intermediate portion 36b extends and the inclined flange-shaped portion 36c extends right and left from the front end of the intermediate portion 36b.

壁本体２４と、第１延長部３５と、第２延長部３６の基端部３６ａとは互いに協働して、内径側に開放された有底のカップ状を呈したポケット部２３Ｐを構成している。このポケット部２３Ｐは、主に上方の間隙を介してハウジング２１内に進入した埃をその底部に捕獲して蓄積する機能を有する。ポケット部２３Ｐの底面は第１延長部３５及び第２延長部３６の基端部３６ａによって囲まれているので、ポケット部２３Ｐの底部に溜まった埃がハウジング２１内の気流や外部から伝わる振動によってハウジング２１の内部で舞い上がる虞が少ない。   The wall body 24, the first extension portion 35, and the base end portion 36a of the second extension portion 36 cooperate with each other to form a bottomed cup-shaped pocket portion 23P opened to the inner diameter side. ing. The pocket portion 23P has a function of trapping and accumulating dust that has entered the housing 21 mainly through an upper gap at the bottom thereof. Since the bottom surface of the pocket portion 23P is surrounded by the base end portion 36a of the first extension portion 35 and the second extension portion 36, dust accumulated at the bottom portion of the pocket portion 23P is caused by airflow in the housing 21 or vibration transmitted from the outside. There is little possibility of flying up inside the housing 21.

基端部３６ａと中間部３６ｂとフランジ状部３６ｃの外径側部位とは、互いに協働して有底カップ状の空間を構成し、反時計方向に隣接する壁部２３の第１延長部３５がこの空間に向かって延びていることで、第１延長部３５の外周に第１のコの字状流路が形成されている。
同様に、フランジ状部３６ｃの内径側部位と中間部３６ｂと基端部３６ａと壁本体３４と第１延長部３５とは、やはり互いに協働して有底カップ状の空間を構成し、時計方向に隣接する壁部２３のフランジ状部３６ｃの外径側部位がこの空間に入り込むように延びていることで、フランジ状部３６ｃの外径側部位の外周に第２のコの字状流路が形成されている。
これらの２つのコの字状流路が互いに連続的に接続されることで、一つの逆Ｓ字状のラビリンス部Ｌを形成している。 The base end portion 36a, the intermediate portion 36b, and the outer diameter side portion of the flange-shaped portion 36c cooperate with each other to form a bottomed cup-shaped space, and the first extension portion of the wall portion 23 adjacent in the counterclockwise direction. By extending 35 toward this space, a first U-shaped channel is formed on the outer periphery of the first extension 35.
Similarly, the inner diameter side portion of the flange-shaped portion 36c, the intermediate portion 36b, the base end portion 36a, the wall main body 34, and the first extension portion 35 also cooperate with each other to form a bottomed cup-shaped space. The outer diameter side portion of the flange-like portion 36c of the wall portion 23 adjacent to the direction extends so as to enter this space, so that the second U-shaped flow is provided on the outer periphery of the outer-diameter side portion of the flange-like portion 36c. A road is formed.
These two U-shaped flow paths are continuously connected to each other to form one reverse S-shaped labyrinth portion L.

一般に、火災警報器１を取り付けた室内で生じる風や、ハウジング２１の内と外の間に存在する僅かな温度差などによって、複数の壁部２３どうしの間隙を介してハウジング２１の内部から外部に向かって排出される気流や、逆に外部から内部に向かって流入する気流が発生することが予測される。図４と図５は、これらの気流の流れをコンピュータによってシミュレーションした結果を示す。   Generally, due to wind generated in the room where the fire alarm 1 is installed or a slight temperature difference between the inside and outside of the housing 21, the inside of the housing 21 is exposed to the outside through the gap between the plurality of wall portions 23. It is predicted that an airflow that is discharged toward the inside or an airflow that flows from the outside toward the inside is generated. FIG. 4 and FIG. 5 show the results of simulation of these airflows by a computer.

このような気流のうち、ハウジング２１の外部から内部に流入する気流は、図３の太い実線及び図４に示すように、先ず、一つの壁部２３の基端部３６ａと、反時計方向に隣接する壁部２３の第１延長部３５との間からラビリンス部Ｌに進入する。ラビリンス部Ｌを通過する際には、中間部３６ｂの背面とフランジ状部３６ｃの外径側部位とによって案内されて、ポケット部２３Ｐの底面を迂回した形で、引き続き、反時計方向に隣接する壁部２３の中間部３６ｂとフランジ状部３６ｃの内径側部位とによって径方向内側に案内されて、煙検知領域２２Ａ付近に進む。すなわち、ラビリンス部Ｌの形状は、ハウジング２１の外部から内部に流入する気流によって、ポケット部２３Ｐの底面に溜まっている埃が同気流で舞い上がり、煙検知領域２２Ａに達するといった事態を防止するように設計されている。   Among such airflows, the airflow flowing from the outside to the inside of the housing 21 is first counterclockwise with the base end portion 36a of one wall portion 23 as shown in the thick solid line of FIG. 3 and FIG. It enters the labyrinth portion L from between the first extension portions 35 of the adjacent wall portions 23. When passing through the labyrinth portion L, it is guided by the back surface of the intermediate portion 36b and the outer diameter side portion of the flange-shaped portion 36c, and is continuously adjacent in the counterclockwise direction while bypassing the bottom surface of the pocket portion 23P. It is guided radially inward by the intermediate portion 36b of the wall portion 23 and the inner diameter side portion of the flange-shaped portion 36c, and proceeds to the vicinity of the smoke detection region 22A. In other words, the shape of the labyrinth portion L is to prevent a situation in which dust accumulated on the bottom surface of the pocket portion 23P is swung up by the airflow flowing into the housing 21 from the outside to reach the smoke detection region 22A. Designed.

次に、上記気流のうち、ハウジング２１の内部から外部に流入する気流は、図３の破線及び図５に示すように、先ず、互いに隣接するフランジ状部３６ｃどうしの間隙からラビリンス部Ｌに進入する。ラビリンス部Ｌを通過する際には、フランジ状部３６ｃの外径側部位によって案内されながら、ポケット部２３Ｐの底面の内面形状に忠実に沿って、底面に在るものをすくい上げるように進む。気流は次に第１延長部３５に沿ってポケット部２３Ｐから抜け出て、時計方向に隣接する壁部２３の中間部３６ｂと基端部３６ａの背面部によって案内されながら、第１延長部３５の先端部を回り込んで、ハウジング２１の外部に排出される。このように気流がポケット部２３Ｐの底面に沿って進む際には、ポケット部２３Ｐの底面に溜まっている埃を積極的に連行して外部に排出する作用を発揮する。   Next, among the airflows, the airflow flowing from the inside of the housing 21 to the outside first enters the labyrinth portion L through the gap between the flange-like portions 36c adjacent to each other as shown in the broken line in FIG. 3 and FIG. To do. When passing through the labyrinth portion L, it is guided by the outer diameter side portion of the flange-shaped portion 36c, and proceeds so as to scoop up what is on the bottom surface along the shape of the inner surface of the bottom surface of the pocket portion 23P. The air flow then escapes from the pocket portion 23P along the first extension portion 35 and is guided by the intermediate portion 36b of the wall portion 23 and the rear end portion of the base end portion 36a adjacent to each other in the clockwise direction. It goes around the tip and is discharged out of the housing 21. As described above, when the air flow advances along the bottom surface of the pocket portion 23P, the dust collected on the bottom surface of the pocket portion 23P is actively entrained and discharged to the outside.

このように、言い換えれば、壁部２３を構成する各部位は、隣接した壁部２３を構成する各部位と協働して、外部からハウジング２１の内部に流入する気流はポケット部２３Ｐを迂回し、ハウジング２１の外部に排出される気流の少なくとも一部はポケット部２３Ｐの底面に沿って流れるように気流を案内する気流案内機構Ｇを構成している。ポケット部２３Ｐ及び気流案内機構Ｇは、主にハウジング２１内部の下方を中心とした位置に配置されている。   In this way, in other words, each part constituting the wall part 23 cooperates with each part constituting the adjacent wall part 23, and the airflow flowing into the housing 21 from the outside bypasses the pocket part 23P. At least a part of the airflow discharged to the outside of the housing 21 constitutes an airflow guide mechanism G that guides the airflow so as to flow along the bottom surface of the pocket portion 23P. The pocket portion 23 </ b> P and the airflow guide mechanism G are mainly disposed at a position centered on the lower side inside the housing 21.

尚、図２に示すように、発光部２５の集光レンズ２５Ｌと受光部２６の集光レンズ２６Ｌとの間には、発光部２５から受光部２６へ向かう直接光を遮断する遮光壁２８が設けてある。したがって、発光部２５や反射板２７から発される光が受光素子２６にそのまま到達することはなく、受光素子２６は煙感知室２２に煙が流入した時に煙によって形成される散乱光のみを受光するようになる。   As shown in FIG. 2, a light shielding wall 28 that blocks direct light from the light emitting unit 25 toward the light receiving unit 26 is disposed between the light collecting unit 25 </ b> L of the light emitting unit 25 and the light collecting unit 26 </ b> L of the light receiving unit 26. It is provided. Therefore, the light emitted from the light emitting unit 25 and the reflecting plate 27 does not reach the light receiving element 26 as it is, and the light receiving element 26 receives only scattered light formed by smoke when smoke flows into the smoke sensing chamber 22. To come.

また、遮光壁２８は、受光部２６の略直に位置するので、埃が煙感知室２２に侵入した場合でも、埃は遮光壁２８の上には堆積し難い。さらに、発光部２５と受光部２６の光軸どうし、及び、反射板２７と受光部２６の光軸どうしを約９０°で交差するように設定した効果によって、遮光壁２８は僅かながら煙検知領域２２Ａの外側に位置し、且つ、受光部２６の軸心から十分に外れている。したがって、仮に埃が遮光壁２８の上に堆積しても、埃が形成する散乱光が受光部２６によって検出される虞は少ない。   In addition, since the light shielding wall 28 is positioned almost directly on the light receiving unit 26, the dust hardly accumulates on the light shielding wall 28 even when dust enters the smoke sensing chamber 22. Further, due to the effect that the optical axes of the light emitting unit 25 and the light receiving unit 26 and the optical axes of the reflecting plate 27 and the light receiving unit 26 intersect at about 90 °, the light shielding wall 28 is slightly smoke detection region. It is located outside 22 </ b> A and is sufficiently away from the axis of the light receiving unit 26. Therefore, even if dust accumulates on the light shielding wall 28, there is little possibility that scattered light formed by the dust is detected by the light receiving unit 26.

因みに、発光部２５と受光部２６との位置関係が、両者の光軸どうしが例えば約１２０°〜１６０°など、発光部２５と受光部２６が対峙的となるように設定されると、受光部２６による散乱光の検出能力は高まるが、間に設ける遮光壁を、より径方向内側に配置する必要が生じる結果、遮光壁に堆積した埃が形成する散乱光による誤検出の虞が増す。
逆に、発光部２５と受光部２６との位置関係が、両者の光軸どうしが例えば約５０°〜７０°など、発光部２５と受光部２６が並行的になるように設定されると、間に設ける遮光壁は径方向外側に配置できるので、遮光壁に堆積した埃が形成する散乱光による誤検出の虞は減るが、散乱光が受光部２６にとって後方散乱となるので、散乱光の検出能力が減少する。
すなわち、発光部２５と受光部２６の光軸どうし、及び、反射板２７と受光部２６の光軸どうしを本実施形態のように、約９０°で交差するように設定した場合、受光部２６による散乱光の検出能力も十分に得られ、且つ、間に設ける遮光壁を比較的径方向外側に配置できるので、遮光壁に堆積した埃が形成する散乱光による誤検出の虞も抑えられる。 Incidentally, if the positional relationship between the light emitting unit 25 and the light receiving unit 26 is set so that the light emitting unit 25 and the light receiving unit 26 are opposed to each other such that the optical axes of the two are about 120 ° to 160 °, for example, Although the detection capability of the scattered light by the part 26 is enhanced, it is necessary to dispose the light shielding wall provided between them in the radial direction. As a result, the possibility of erroneous detection due to scattered light formed by dust accumulated on the light shielding wall increases.
Conversely, when the positional relationship between the light emitting unit 25 and the light receiving unit 26 is set so that the light emitting unit 25 and the light receiving unit 26 are in parallel, such that the optical axes of the two are about 50 ° to 70 °, for example. Since the light shielding wall provided between them can be arranged on the outer side in the radial direction, the possibility of erroneous detection due to scattered light formed by dust accumulated on the light shielding wall is reduced, but the scattered light is backscattered for the light receiving unit 26, so Detection capability is reduced.
That is, when the optical axes of the light emitting unit 25 and the light receiving unit 26 and the optical axes of the reflecting plate 27 and the light receiving unit 26 are set to intersect at about 90 ° as in the present embodiment, the light receiving unit 26 The scattered light detection capability due to the light can be sufficiently obtained, and the light shielding wall provided between them can be disposed relatively outside in the radial direction, so that the possibility of erroneous detection due to scattered light formed by dust accumulated on the light shielding wall can be suppressed.

反射板２７は、発光部２５と対向配置されている壁部２３のフランジ状部３６ｃを僅かに変形し、その内面側を鏡面化することで実現されている。そして、反射板２７の背面には、上方に隣接する間隙と反射板の背後の空間とを反射板の反射面を介さずに連通接続させる埃導入経路３０が設けられている。反射板２７の上方に隣接する間隙から進入した埃は、図２に破線の矢印で例示するように、反射板２７の反射面の前を通らずに、この埃導入経路３０に沿って反射板２７の背面から、反射板２７の背後にある間隙を介して、外部に排出され易い。   The reflecting plate 27 is realized by slightly deforming the flange-like portion 36c of the wall portion 23 disposed to face the light emitting portion 25 and making the inner surface thereof a mirror surface. A dust introduction path 30 is provided on the back surface of the reflecting plate 27 to connect the gap adjacent to the upper side and the space behind the reflecting plate without passing through the reflecting surface of the reflecting plate. The dust that has entered from the gap adjacent to the upper side of the reflecting plate 27 does not pass in front of the reflecting surface of the reflecting plate 27 and is reflected along the dust introduction path 30 as illustrated by a broken arrow in FIG. It is easy to be discharged to the outside from the back surface of 27 through the gap behind the reflection plate 27.

本発明による光電式煙感知器を備えた火災警報器の外観図External view of a fire alarm equipped with a photoelectric smoke detector according to the present invention 図１の光電式煙感知器に設けられた煙感知部の破断正面図FIG. 1 is a cutaway front view of a smoke detector provided in the photoelectric smoke detector of FIG. 図２の煙感知部の要部を示す拡大図The enlarged view which shows the principal part of the smoke detection part of FIG. 外部から内部へ向かう気流の経路を示す略図Schematic showing the path of airflow from outside to inside 内部から外部へ向かう気流の経路を示す略図Schematic showing the path of airflow from inside to outside

符号の説明Explanation of symbols

１ 火災警報器
２ 煙感知部
３ 警報スピーカ部
４ 警報ランプ
２１ ハウジング
２２ 煙感知室
２２Ａ 煙検知領域
２３ 壁部
２３Ｐ ポケット部
２５ 発光部
２５Ｄ 発光素子
２５Ｌ 集光レンズ
２６ 受光部
２６Ｄ 受光素子
２６Ｌ 集光レンズ
２７ 反射板
２８ 第１遮光壁
２９ 第２遮光壁
３０ 埃導入経路
３４ 壁本体
３５ 第１延長部
３６ 第２延長部
３６ａ 基端部
３６ｂ 中間部
３６ｃ フランジ状部
Ｌ ラビリンス部
Ｇ 気流案内機構 DESCRIPTION OF SYMBOLS 1 Fire alarm 2 Smoke detection part 3 Alarm speaker part 4 Alarm lamp 21 Housing 22 Smoke detection room 22A Smoke detection area 23 Wall part 23P Pocket part 25 Light emission part 25D Light emission element 25L Condensing lens 26 Light reception part 26D Light reception element 26L Condensing Lens 27 Reflector 28 First light shielding wall 29 Second light shielding wall 30 Dust introduction path 34 Wall main body 35 First extension part 36 Second extension part 36a Base end part 36b Intermediate part 36c Flange-like part L Labyrinth part G Airflow guide mechanism

Claims (3)

外部からの煙を流入させると共に外部からの光を遮断する複数の壁部を備えたハウジングと、
前記ハウジングの内部に光を照射する発光部と、
前記ハウジングの内部に流入した煙による散乱光を検知する受光部と、
前記ハウジング内に進入した埃を捕捉すべく前記複数の壁部の内面の少なくとも一部に配置されたポケット部と、を備え、
外部から前記ハウジングの内部に流入する気流は前記ポケット部を迂回し、前記複数の壁部の間から前記ハウジングの外部に排出される気流の少なくとも一部は前記ポケット部の底面に沿って流れるように気流を案内する気流案内機構が設けられている光電式煙感知器。 A housing having a plurality of walls that allow smoke from the outside to flow in and block light from the outside;
A light emitting unit for irradiating light inside the housing;
A light receiving unit for detecting scattered light from smoke flowing into the housing;
A pocket portion disposed on at least a part of the inner surfaces of the plurality of wall portions to capture dust that has entered the housing, and
Airflow flowing into the housing from the outside bypasses the pocket portion, and at least part of the airflow discharged to the outside of the housing from between the plurality of wall portions flows along the bottom surface of the pocket portion. A photoelectric smoke detector provided with an airflow guide mechanism for guiding the airflow. 前記ポケット部を構成する前記壁部の、前記ハウジングの内部から外部に向かって排出される気流に関して最も下流側の端部が前記ハウジングの外周面に対して鋭角状に延設されている請求項１に記載の光電式煙感知器。   The most downstream end of the wall portion constituting the pocket portion with respect to the airflow discharged from the inside of the housing toward the outside is extended at an acute angle with respect to the outer peripheral surface of the housing. The photoelectric smoke detector according to 1. 前記発光部の軸心と前記受光部の軸心とを含む平面が建物の壁面に沿った設置状態において、前記ポケット部及び前記気流案内機構が前記ハウジング内部の下方に位置するように構成されている請求項２に記載の光電式煙感知器。   The pocket portion and the airflow guide mechanism are configured to be positioned below the inside of the housing in a state where a plane including the axis of the light emitting unit and the axis of the light receiving unit is along the wall surface of the building. The photoelectric smoke detector according to claim 2.
JP2008179315A 2008-07-09 2008-07-09 Photoelectric smoke detector Active JP5133157B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008179315A JP5133157B2 (en) 2008-07-09 2008-07-09 Photoelectric smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008179315A JP5133157B2 (en) 2008-07-09 2008-07-09 Photoelectric smoke detector

Publications (2)

Publication Number Publication Date
JP2010020471A true JP2010020471A (en) 2010-01-28
JP5133157B2 JP5133157B2 (en) 2013-01-30

Family

ID=41705308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008179315A Active JP5133157B2 (en) 2008-07-09 2008-07-09 Photoelectric smoke detector

Country Status (1)

Country Link
JP (1) JP5133157B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101102573B1 (en) * 2010-03-23 2012-01-04 주식회사 금륜방재산업 Photoelectric fire detector using reflector and control system thereof
CN114387756A (en) * 2021-12-31 2022-04-22 新驱动(福建)信息科技有限公司 Convenient-to-assemble combined fire detector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6237751U (en) * 1985-08-24 1987-03-06
JPH06111156A (en) * 1993-03-16 1994-04-22 Nohmi Bosai Ltd Photoelectric smoke sensor
JPH08293084A (en) * 1995-04-21 1996-11-05 Nohmi Bosai Ltd Fire sensor
JP2007011684A (en) * 2005-06-30 2007-01-18 Nittan Co Ltd Fire sensor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6237751U (en) * 1985-08-24 1987-03-06
JPH06111156A (en) * 1993-03-16 1994-04-22 Nohmi Bosai Ltd Photoelectric smoke sensor
JPH08293084A (en) * 1995-04-21 1996-11-05 Nohmi Bosai Ltd Fire sensor
JP2007011684A (en) * 2005-06-30 2007-01-18 Nittan Co Ltd Fire sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101102573B1 (en) * 2010-03-23 2012-01-04 주식회사 금륜방재산업 Photoelectric fire detector using reflector and control system thereof
CN114387756A (en) * 2021-12-31 2022-04-22 新驱动(福建)信息科技有限公司 Convenient-to-assemble combined fire detector
CN114387756B (en) * 2021-12-31 2023-12-26 新驱动(福建)信息科技有限公司 Combined fire detector convenient to assemble

Also Published As

Publication number Publication date
JP5133157B2 (en) 2013-01-30

Similar Documents

Publication Publication Date Title
JP4652716B2 (en) smoke detector
US8232885B2 (en) Photoelectric smoke detector
JP5834374B2 (en) Photoelectric smoke detector
JP5579899B2 (en) Photoelectric smoke detector
KR101482180B1 (en) Photoelectric smoke detector
JP6029055B2 (en) smoke detector
JP3612922B2 (en) Smoke detectors
JP5133157B2 (en) Photoelectric smoke detector
JP5046552B2 (en) Photoelectric smoke detector
JP5237004B2 (en) Photoelectric smoke detector
JP6957273B2 (en) Scattered light detector
JP5442207B2 (en) Lighting device and smoke detector
JP5038112B2 (en) Photoelectric smoke detector
JP5325397B2 (en) smoke detector
JP5280347B2 (en) Photoelectric smoke detector
JP5210757B2 (en) smoke detector
JP6470558B2 (en) Photoelectric smoke detector
JP2016115062A (en) Photoelectric smoke detector
JP5379369B2 (en) Photoelectric smoke detector
JP6470559B2 (en) Photoelectric smoke detector
JP2011076285A (en) Photoelectric smoke sensor
JP5117820B2 (en) Photoelectric smoke detector
JP2016130882A (en) Photoelectric smoke detector
JP5153709B2 (en) Photoelectric smoke detector
JP5606123B2 (en) Photoelectric smoke detector

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20101221

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120516

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120531

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120730

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20121101

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20121107

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20151116

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 5133157

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250