JP2008310732A - Smoke sensor - Google Patents

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JP2008310732A
JP2008310732A JP2007160072A JP2007160072A JP2008310732A JP 2008310732 A JP2008310732 A JP 2008310732A JP 2007160072 A JP2007160072 A JP 2007160072A JP 2007160072 A JP2007160072 A JP 2007160072A JP 2008310732 A JP2008310732 A JP 2008310732A
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smoke
speaker
wall
labyrinth
sensing chamber
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JP4650455B2 (en
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Shoichi Oka
昭一 岡
Koji Sakamoto
浩司 阪本
Yoshitake Shimada
佳武 島田
Hiroshi Yokota
浩 横田
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Panasonic Electric Works Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a smoke sensor which is excellent in smoke sensitivity for ringing an alarm sound whose sound pressure is high. <P>SOLUTION: In a smoke sensor A including a smoke sensing chamber S equipped with a light emitting part 10, a light receiving part 11, and a plurality of labyrinth walls 2 below a base 2 mounted on a ceiling face or the like, and a sensing part head 5 in which a speaker 4 is housed below the smoke sensing chamber, an isolation wall 30 is interposed between the smoke sensing chamber and the speaker, and the isolation wall is provided with a plurality of vent holes 30a leading to positions corresponding to the neighborhood of the outer periphery of the smoke sensing chamber. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、発光部と受光部とを内装した煙感知室内に煙を流入させて、煙による散乱光を検知して、火災警報を出力する光電式の煙感知器の改良に関する。   The present invention relates to an improvement in a photoelectric smoke detector that emits smoke into a smoke sensing chamber including a light emitting unit and a light receiving unit, detects scattered light from the smoke, and outputs a fire alarm.

この種の煙感知器としては、天井面等に取り付けられるベースの下方に、発光部と受光部とを備えた煙感知室を内装した感知部ヘッドを設け、複数のラビリンス壁を周設した煙感知室内に、発光部を設けるとともに、この発光部から発せられた光を直接受光しない位置に受光部を設けて感煙領域を構成し、ラビリンス壁に形成された煙流入口を通って感煙領域に流入して来た煙による散乱光を受光部で受光させ、受光信号が閾値を超えたときに火災発報信号を出力して火災警報を行うものが知られている。
また近時においては、警報音だけでなく、音声メッセージで火災警報を出力させるために、従来のブザーに変えて、感知部ヘッド内にスピーカを収容した煙感知器も開発されている。
下記特許文献1には、外カバー(感知部ヘッド)の2段に絞り込んだ先端部分に、煙感知室を備えた検煙部カバーに続いて、回路基板を組み込み、該回路基板に対し電気的に接続されたスピーカが組み込まれ、感知部ヘッドにスピーカの音孔が形成されたものが開示されている(特許文献1・図7参照)。
特開2005−352932号公報
As this type of smoke detector, a smoke sensor with a smoke sensor chamber equipped with a light emitter and a light receiver is provided below a base attached to a ceiling surface or the like, and a smoke having a plurality of labyrinth walls. A light emitting part is provided in the sensing chamber, and a light receiving part is provided at a position where the light emitted from the light emitting part is not directly received to constitute a smoke sensitive region, and the smoke sensitive part passes through the smoke inlet formed in the labyrinth wall. It is known that a light receiving unit receives scattered light from smoke that has flowed into a region, and outputs a fire alarm signal when a received light signal exceeds a threshold value to give a fire alarm.
Recently, in order to output a fire alarm not only with an alarm sound but also with a voice message, a smoke detector having a speaker housed in the sensor head has been developed instead of the conventional buzzer.
In Patent Document 1 below, a circuit board is incorporated at the tip of the outer cover (detection unit head) that has been narrowed down to two levels, following a smoke detection unit cover having a smoke detection chamber. A speaker in which a sound hole of a speaker is formed in a sensing unit head is disclosed (see Patent Document 1 and FIG. 7).
JP 2005-352932 A

しかしながら、このような構造のものは、上述のように感知器ヘッドにスピーカの音孔が形成されているため、音孔側はスピーカを振動させ、良好な音を鳴動させるための空気を確保することができるが、スピーカの裏面側(スピーカの音が発生する面に対して裏面側)は検煙部カバーで仕切られた状態となっているため、音圧が低下してしまい、音圧の高い警報音を鳴動させることができる煙感知器を構成することができなかった。
そこで、例えば音圧を低下させないために、スピーカの側面周辺に通気孔を形成することが考えられるが、この場合は、火災警報時のスピーカの鳴動によって生じる振動で、煙感知室内に空気が流入してしまう。特に、発光部と受光部の光軸が交わる一帯に構成される感煙領域に空気が流入すると、煙感知室内の煙濃度や温度が一時的に低下して悪影響を与えることが考えられる。また、このような通気孔を設ける場合には、煙感知室内にその通気孔を通じて外光が入って煙感知感度が低下することがないよう配慮するも必要があった。
However, in such a structure, the sound hole of the speaker is formed in the sensor head as described above, so the sound hole side vibrates the speaker and secures air for sounding a good sound. However, since the back side of the speaker (the back side with respect to the surface where the sound of the speaker is generated) is partitioned by the smoke detector cover, the sound pressure decreases and the sound pressure is reduced. It was not possible to construct a smoke detector capable of producing a high alarm sound.
Therefore, for example, in order not to reduce the sound pressure, it is conceivable to form a vent around the side of the speaker. In this case, air flows into the smoke sensing chamber due to vibration caused by the sound of the speaker at the time of a fire alarm. Resulting in. In particular, when air flows into a smoke sensing region formed in a zone where the optical axes of the light emitting unit and the light receiving unit intersect, it is conceivable that the smoke concentration and temperature in the smoke sensing chamber are temporarily lowered and adversely affected. In addition, when such a vent is provided, it is necessary to consider that outside light enters the smoke sensing chamber through the vent and the smoke sensing sensitivity is not lowered.

本発明は、このような事情を考慮して提案されるものであり、音圧の高い警報音を鳴動させることができ、煙感知感度のよい煙感知器を提供することを目的とする。   The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a smoke detector capable of generating an alarm sound having a high sound pressure and having high smoke detection sensitivity.

上記目的を達成するために、請求項1に記載の煙感知器は、天井面等に取り付けられるベースの下方に、発光部と受光部とを備え複数のラビリンス壁が周設された煙感知室を内装し、該煙感知室の下方にはスピーカを収容した感知部ヘッドを設けた煙感知器において、上記煙感知室と上記スピーカとの間には、隔離壁を介在させており、該隔離壁には、上記煙感知室内の外周付近に対応する位置に通じる通気孔が複数設けられていることを特徴とする。
請求項2に記載の煙感知器では、前記通気孔は、前記ラビリンス壁と前記ラビリンス壁との間に対応する位置に通じるよう形成されていることを特徴とする。
請求項3に記載の煙感知器では、前記ラビリンス壁には、前記通気孔に整合させて形成された貫通孔が設けられていることを特徴とする。
In order to achieve the above object, the smoke detector according to claim 1 is provided with a smoke detection chamber having a light emitting part and a light receiving part provided below a base attached to a ceiling surface or the like, and a plurality of labyrinth walls provided around the light detecting part. And a smoke detector provided with a sensor head that houses a speaker below the smoke detection chamber, wherein an isolation wall is interposed between the smoke detection chamber and the speaker, The wall is provided with a plurality of vent holes that lead to positions corresponding to the vicinity of the outer periphery of the smoke sensing chamber.
The smoke sensor according to claim 2, wherein the vent hole is formed so as to communicate with a corresponding position between the labyrinth wall and the labyrinth wall.
In the smoke sensor according to claim 3, the labyrinth wall is provided with a through hole formed in alignment with the vent hole.

請求項1に記載の煙感知器によれば、煙感知室と感知器ヘッドに設けられたスピーカとの間には、煙感知室内の外周付近に対応する位置に通じる通気孔が複数設けられた隔離壁を介在させているので、スピーカを十分に振動させるために必要な通気性を音孔側だけでなく、煙感知室側も確保できる。よってスピーカから十分な音圧の警報音を鳴動することができ、報知能力の高い煙感知器となる。
またスピーカの振動が作用して流入する空気が煙感知に影響を与えず、火災警報時でもスピーカの振動により煙感知感度が低下することがない信頼性の高い煙感知器を構成することができる。
更に、感知器ヘッドに形成された音孔と煙感知室の間には、スピーカ及び隔離壁が存在するので、音孔から入り込む光を遮断することができ、煙感知感度のよいものとすることができる。
According to the smoke detector according to claim 1, a plurality of vent holes leading to a position corresponding to the vicinity of the outer periphery of the smoke detection chamber are provided between the smoke detection chamber and the speaker provided in the detector head. Since the isolation wall is interposed, not only the sound hole side but also the smoke sensing chamber side can be ensured for the air permeability necessary for sufficiently vibrating the speaker. Therefore, an alarm sound having a sufficient sound pressure can be generated from the speaker, and a smoke detector having a high notification capability can be obtained.
In addition, it is possible to configure a highly reliable smoke detector that does not affect the smoke detection due to the vibration of the speaker and does not affect the smoke detection, and that the smoke detection sensitivity does not decrease due to the vibration of the speaker even during a fire alarm. .
Furthermore, since there is a speaker and an isolation wall between the sound hole formed in the sensor head and the smoke detection chamber, the light entering from the sound hole can be blocked and the smoke detection sensitivity should be good. Can do.

請求項2に記載の煙感知器によれば、通気孔は、前記ラビリンス壁と前記ラビリンス壁との間に対応する位置に通じるよう形成されているので、スピーカの鳴動に伴う振動によって煙感知室に流入しようとする空気は、通気孔を通じて煙感知室のラビリンス壁とラビリンス壁の間に流入するので、煙感知室の感煙領域に空気が直接流入することを防ぐことができる。よって、スピーカが火災警報の鳴動により振動しても、感煙領域に空気が流入せず、火災を検知しにくくなることを防止して、火災が発生し続けているにも関わらず、スピーカによる警報音が鳴り止んでしまうといった不具合を防止することができる。   According to the smoke detector according to claim 2, since the vent hole is formed so as to lead to a corresponding position between the labyrinth wall and the labyrinth wall, the smoke detection chamber is caused by vibration accompanying the sound of the speaker. Since the air that is about to flow into the air flows between the labyrinth wall and the labyrinth wall of the smoke sensing chamber through the vent hole, the air can be prevented from directly flowing into the smoke sensing area of the smoke sensing chamber. Therefore, even if the speaker vibrates due to the sound of a fire alarm, air does not flow into the smoke-sensitive area, preventing the fire from becoming difficult to detect. It is possible to prevent problems such as the alarm sounding and stopping.

請求項3に記載の煙感知器によれば、通気孔は、ラビリンス壁に形成した貫通孔に整合させているので、通気孔を通じて流入してきた空気は、煙感知室内に充満することなく、ラビリンス壁に形成した貫通孔を通じて、煙感知室外へ排気することができる。よって、煙感知室内に空気が流入せず、スピーカの振動に起因して煙感知感度が低下することを防ぐことができる。   According to the smoke sensor of the third aspect, since the vent hole is aligned with the through hole formed in the labyrinth wall, the air flowing in through the vent hole does not fill the smoke sensing chamber, and the labyrinth. The smoke can be exhausted through the through-hole formed in the wall. Therefore, it is possible to prevent the smoke detection sensitivity from being lowered due to the vibration of the speaker without air flowing into the smoke detection chamber.

以下に、本発明の実施の形態について、添付図面を参照しながら説明し、第1の実施形態を図1〜図4、第2の実施形態を図5、図6に示す。   Embodiments of the present invention will be described below with reference to the accompanying drawings, with the first embodiment shown in FIGS. 1 to 4 and the second embodiment shown in FIGS. 5 and 6.

図1は、本発明の煙感知器の一例を示す縦断面図、図2は同煙感知器の分解斜視図である。
図中、Aは煙感知器、2は天井面等に取り付けられるベース部(ベース)、1は煙感知室Sを構成する光学基台、3は後記する隔離壁30を備えた防虫カバー、4はスピーカ、5は有底筒型で底に複数の音孔5aが形成され感知器ヘッドである。図中4Aは音孔側、4Bは煙感知室側を示している。
煙感知器Aは、図1、図2に示すように、天井面等に取り付けられるベース部2と、発光ダイオードLやフォトダイオードPDの光学系素子や受光信号を監視して閾値を超えたときに火災発報信号を出力する投受光回路やマイコン(不図示)等の回路部品が実装される回路基板2aと、煙感知室Sが設けられ、発光ユニット10、受光ユニット11等の光学系部品とラビリンス壁12を備えた光学基台1と、煙感知室Sの内部に虫等が侵入するのを防止する防虫カバー3と、火災を検知すると警報音を鳴動する板状のスピーカ4と、感知器ヘッド5とで構成される。
回路基板2aを光学基台1に取り付けた状態でベース部2に収容し、光学基台1の周縁に形成された結合溝13aに防虫カバー3を被せて結合し、更に、防虫カバー3に形成された支持部3bの嵌合部3baにスピーカ4を嵌め入れた後、感知部ヘッド5をベース部2の開口21に嵌合させて、天井面等に取り付けられるようになっている。
FIG. 1 is a longitudinal sectional view showing an example of the smoke detector of the present invention, and FIG. 2 is an exploded perspective view of the smoke detector.
In the figure, A is a smoke detector, 2 is a base part (base) attached to a ceiling surface, etc., 1 is an optical base constituting the smoke detection chamber S, 3 is an insect-proof cover provided with an isolation wall 30 described later, 4 Is a sensor head having a bottomed cylindrical shape and a plurality of sound holes 5a formed at the bottom. In the figure, 4A indicates the sound hole side, and 4B indicates the smoke sensing chamber side.
As shown in FIG. 1 and FIG. 2, the smoke detector A monitors the optical system elements such as the base part 2 attached to the ceiling surface and the like, the light emitting diode L and the photodiode PD, and the light receiving signal, and exceeds a threshold value. A circuit board 2a on which circuit components such as a light emitting / receiving circuit and a microcomputer (not shown) for outputting a fire alarm signal are mounted, and a smoke sensing chamber S are provided, and optical components such as the light emitting unit 10 and the light receiving unit 11 are provided. An optical base 1 having a labyrinth wall 12, an insect cover 3 for preventing insects and the like from entering the smoke sensing chamber S, a plate-like speaker 4 for sounding an alarm sound when a fire is detected, It consists of a sensor head 5.
The circuit board 2a is accommodated in the base part 2 in a state of being attached to the optical base 1, and is bonded to the coupling groove 13a formed on the periphery of the optical base 1 by covering the insect protective cover 3, and further formed on the insect protective cover 3. After the speaker 4 is fitted into the fitting portion 3ba of the support portion 3b, the sensing portion head 5 is fitted into the opening 21 of the base portion 2 and attached to the ceiling surface or the like.

煙感知室Sは、横断面が円状の光学基台1で構成され、光学基台1は底面1aと周壁13とを有し、上方を開口した有底筒状体となっており、光学基台1には、後記する発光ユニット収容部16と受光ユニット収容部17(図4参照)とが形成され、周壁13の内側には結合溝13Aが形成されている。そして煙感知室Sには、発光ユニット10と受光ユニット11とを取り囲むようにして、複数のラビリンス壁12が周設されている。尚、煙感知室Sについては、後に図4を参照しながら詳しく説明する。   The smoke detection chamber S is composed of an optical base 1 having a circular cross section, and the optical base 1 has a bottom surface 1a and a peripheral wall 13 and is a bottomed cylindrical body that opens upward, and is optical. A light emitting unit housing portion 16 and a light receiving unit housing portion 17 (see FIG. 4), which will be described later, are formed on the base 1, and a coupling groove 13 </ b> A is formed inside the peripheral wall 13. In the smoke detection chamber S, a plurality of labyrinth walls 12 are provided so as to surround the light emitting unit 10 and the light receiving unit 11. The smoke sensing chamber S will be described in detail later with reference to FIG.

防虫カバー3は、合成樹脂等により筒状に形成され、その周壁3aには周方向に沿って帯状の窓孔3cが複数開口されており、窓孔3cは、後記する感知器ヘッド5の開口窓5bよりも狭い隙間で構成され、煙感知室S内に虫や埃等の異物が侵入するのを防止している。そして防虫カバー3には、煙感知室Sとスピーカ4との間を仕切るように、複数の通気孔30aが形成された隔離壁30が一体に形成されており、通気孔30aは、煙感知室Sに通じ、煙感知室Sのラビリンス壁12に対応する位置に形成されている。   The insect repellent cover 3 is formed in a cylindrical shape with synthetic resin or the like, and a plurality of belt-like window holes 3c are opened along the circumferential direction on the peripheral wall 3a. The window holes 3c are openings of the sensor head 5 described later. It is configured with a gap narrower than the window 5b, and prevents foreign matter such as insects and dust from entering the smoke sensing chamber S. The insect-proof cover 3 is integrally formed with an isolation wall 30 formed with a plurality of vent holes 30a so as to partition the smoke sensing chamber S and the speaker 4 from each other. S is formed at a position corresponding to the labyrinth wall 12 of the smoke sensing chamber S.

スピーカ4は、良好な音質のダイナミックスピーカやピエゾ素子等の圧電素子を用いた圧電スピーカ等を用いることができる。このようなスピーカ4を用いれば、従来のブザーによる警報音とは異なり、音声合成や予め記憶させた所定の警報パターンを出力することが出来る。スピーカ4の外周縁は突起部4aが形成されており、防虫カバー3の嵌合部3bに嵌め込まれた状態で、感知部ヘッド5を被せるとスピーカ4の音孔側4A及び煙感知室側4Bの両面に一定の空隙を形成することができる。
感知器ヘッド5は、煙感知室Sに煙を流入させるために、格子状に枠組された多数の窓枠で仕切られた多数の開口窓5bが設けられおり、スピーカ4を感知器ヘッド5の下方に収容させるために、防虫カバー3よりも大きく深く形成されている。
このように、隔離壁30が防虫カバー3に一体に形成され、固定一体となった状態で、防虫カバー3を光学基台1の結合溝13aに被せて結合させた後、スピーカ4を防虫カバー3の嵌合部3baに嵌合させ、感知部ヘッド5を被せれば、スピーカ4を感知器ヘッド5と隔離壁30の間に簡単に収容することができる。
尚、隔離壁30は防虫カバー3に一体に形成されるものに限定されず、円形の板体として別途形成し、防虫カバー3に嵌め込まれるものであってもよく、要は煙感知室Sとスピーカ4との間に介在するよう設置されるものであればよい。
As the speaker 4, a dynamic speaker with good sound quality, a piezoelectric speaker using a piezoelectric element such as a piezoelectric element, or the like can be used. If such a speaker 4 is used, unlike a conventional alarm sound by a buzzer, voice synthesis or a predetermined alarm pattern stored in advance can be output. A protrusion 4a is formed on the outer peripheral edge of the speaker 4, and the sound hole side 4A and the smoke detection chamber side 4B of the speaker 4 are covered when the detection unit head 5 is covered with the protrusion 4a fitted in the fitting portion 3b of the insect-proof cover 3. A constant gap can be formed on both sides of the substrate.
The sensor head 5 is provided with a large number of opening windows 5b partitioned by a large number of window frames that are framed in a lattice pattern in order to allow the smoke to flow into the smoke detection chamber S. In order to accommodate it below, it is formed deeper and deeper than the insect-proof cover 3.
Thus, after the isolation wall 30 is formed integrally with the insect-proof cover 3 and is fixed and integrated, the insect-protective cover 3 is put on the coupling groove 13a of the optical base 1 and joined, and then the speaker 4 is attached to the insect-proof cover. 3 is fitted to the fitting portion 3ba and covered with the sensing portion head 5, the speaker 4 can be easily accommodated between the sensing head 5 and the separating wall 30.
The isolation wall 30 is not limited to the one formed integrally with the insect-proof cover 3, but may be separately formed as a circular plate body and fitted into the insect-protecting cover 3. What is necessary is just to be installed so that it may interpose between the speakers 4.

図1中、矢印d1は空気の流れの一例を示しており、このように隔離壁30の通気孔30aが煙感知室Sに通じ、ラビリンス壁12に対応する位置に複数形成されているため、開口窓5bから流入した空気は、スピーカ4の煙感知室側4Bを通って通気孔30aを通じ、煙感知室Sの感煙領域15へ流れることなく、再び開口窓5bから排気される。これによりスピーカ4の煙感知室側4B面の通気性を確保することができるので、十分にスピーカ4を振動させることができ、音圧の高い警報音を鳴動させることができる煙感知器Aを構成することができる。   In FIG. 1, an arrow d <b> 1 shows an example of the air flow, and a plurality of ventilation holes 30 a of the isolation wall 30 lead to the smoke sensing chamber S and are formed at positions corresponding to the labyrinth wall 12 in this way. The air flowing in from the opening window 5b is exhausted from the opening window 5b again without flowing through the smoke sensing chamber side 4B of the speaker 4 and the vent hole 30a to the smoke sensing area 15 of the smoke sensing chamber S. As a result, it is possible to ensure the air permeability of the smoke sensing chamber side 4B surface of the speaker 4, so that the smoke detector A can sufficiently vibrate the speaker 4 and can generate an alarm sound with a high sound pressure. Can be configured.

図3は本発明の煙感知器に備えられた防虫カバーの斜視図であり、スピーカ4が設置される面側から見た斜視図を示している。の図)、図4は同煙感知器に備えられた煙感知室の平面図(天井面に取り付けた場合に下方から見た平面図)である。
防虫カバー3は、上述のように、筒状に形成され、その周壁3aには円周方向に沿って複数形成された帯状の窓孔3cを備え、煙感知室Sとスピーカ4との間を仕切るように設けられた円板状の隔離壁30には、複数の通気孔30aが煙感知室Sに周設されているラビリンス壁12に対応する位置、即ち通気孔30aから煙感知室Sに流入する空気が後記する感煙領域15に流入しないよう形成されている。
隔離壁30のスピーカ4設置される面には、スピーカ4が一定の隙間をもって支持されよう形成された支持部3bが形成されており、その支持部3bの内周側は、スピーカ4の煙感知室側4B面が嵌めこまれるよう切欠形状の嵌合部3baを備えている。
FIG. 3 is a perspective view of the insect-proof cover provided in the smoke detector of the present invention, and shows a perspective view seen from the surface side on which the speaker 4 is installed. FIG. 4 is a plan view of a smoke detection chamber provided in the smoke detector (a plan view seen from below when attached to the ceiling surface).
As described above, the insect-proof cover 3 is formed in a cylindrical shape, and the peripheral wall 3a includes a plurality of belt-shaped window holes 3c formed along the circumferential direction, and the space between the smoke sensing chamber S and the speaker 4 is provided. In the disc-shaped isolation wall 30 provided so as to partition, a plurality of vent holes 30a correspond to the labyrinth wall 12 provided around the smoke sensing chamber S, that is, from the vent hole 30a to the smoke sensing chamber S. The inflowing air is formed so as not to flow into the smoke sensitive area 15 described later.
On the surface of the isolation wall 30 where the speaker 4 is installed, a support portion 3b is formed so that the speaker 4 is supported with a certain gap, and the inner peripheral side of the support portion 3b is the smoke detection of the speaker 4. A notch-shaped fitting portion 3ba is provided so that the chamber side 4B surface is fitted.

図4は同煙感知器に備えられた煙感知室の平面図(天井面に取り付けた場合に下方から見た平面図)であり、隔離壁を備えた防虫カバーと一体になった状態を示しているため、通気孔等を2点鎖線で示している。
発光素子として発光ダイオードL等で構成される発光ユニット10、受光素子としてフォトダイオードPD等で構成される受光ユニット11は、光学基台1とは別体に構成された回路基板2a上に、両者の光軸L1,L2が所定の角度θ(例えば130度)をもって交差するように実装されており、2つの光軸L1,L2の交差点が感煙領域15の中心点となる。光学基台1とこの回路基板2(図1参照)とをベース部2に収容し、両者を組付けたときに、それぞれの収容部16,17に収容され、内装されるようになっている。
FIG. 4 is a plan view of a smoke detection chamber provided in the smoke detector (a plan view seen from below when attached to the ceiling surface), and shows a state integrated with an insect-proof cover provided with an isolation wall. Therefore, the vent holes and the like are indicated by a two-dot chain line.
A light-emitting unit 10 composed of a light-emitting diode L or the like as a light-emitting element and a light-receiving unit 11 composed of a photodiode PD or the like as a light-receiving element are arranged on a circuit board 2a configured separately from the optical base 1. The optical axes L1 and L2 are mounted so as to intersect with each other at a predetermined angle θ (for example, 130 degrees), and the intersection of the two optical axes L1 and L2 is the center point of the smoke sensitive region 15. When the optical base 1 and the circuit board 2 (see FIG. 1) are accommodated in the base portion 2 and are assembled together, they are accommodated in and accommodated in the accommodating portions 16 and 17, respectively. .

複数のラビリンス壁12のそれぞれは、光学基台1の周壁13より突出するようにして底面1aより立設され、周壁13から突出した部分に形成された空隙が煙流入口14を構成している。また、ラビリンス壁12は、それぞれの先端12bを先細り状にして感煙領域Sに向けて屈曲させるとともに、屈曲部12aより周壁13b側に小突起12cを突出させた形状にしており、これによって、煙流入口14から侵入して来る外光を屈曲部12aと小突起12cとで煙感知室1の外方に反射させるとともに、煙流入口14より侵入した煙を感煙領域15に誘導している。
また、それぞれの先端12bを先細り状にすることで、発光ユニット10からの光を受けたとき、反射光を散乱させることで、受光ユニットに直接入光させないようにしている。そしてラビリンス壁12は、受光ユニット11に対向した部分と、それ以外の部分とで形状を異ならせており、前者のものは、周壁13b側を末広形状12dにすることで、隣接するラビリンス壁12の隙間から受光ユニット11に直接入光させないようにしている。
Each of the plurality of labyrinth walls 12 is erected from the bottom surface 1 a so as to protrude from the peripheral wall 13 of the optical base 1, and a gap formed in a portion protruding from the peripheral wall 13 constitutes the smoke inlet 14. . Further, the labyrinth wall 12 has a shape in which each tip 12b is tapered and bent toward the smoke sensing region S, and a small protrusion 12c is protruded from the bent portion 12a toward the peripheral wall 13b. The external light entering from the smoke inlet 14 is reflected to the outside of the smoke sensing chamber 1 by the bent portion 12a and the small protrusion 12c, and the smoke that has entered from the smoke inlet 14 is guided to the smoke sensing region 15. Yes.
Further, each of the tips 12b is tapered so that when receiving light from the light emitting unit 10, the reflected light is scattered so as not to directly enter the light receiving unit. The shape of the labyrinth wall 12 is different between a portion facing the light receiving unit 11 and a portion other than the light receiving unit 11. In the former, the labyrinth wall 12 adjacent to the labyrinth wall 12 is formed by making the peripheral wall 13 b side into a divergent shape 12 d. The light is not directly incident on the light receiving unit 11 through the gap.

更に本実施形態では、感煙領域15の付近に遮光壁19が設けて、発光ユニット10からの出射光が直接受光ユニット11に入射するのを防いだ例を示している。そして、発光ユニット10と受光ユニット11とで挟まれ部分に設けられたラビリンス壁12の感煙領域15側に向いた端部12eと、遮光壁19がラビリンス壁12と対向する対向端部19aとは仕切部材18で連結され、該仕切部材18で煙誘導壁を構成している。この仕切部材18によって、煙流入口14から流入してきた煙は、発光ユニット10と受光ユニット11とで挟まれた部分に滞留することなく、感煙領域15へと誘導される。
尚、ラビリンス壁12の形状は図例に限定されるものではなく、また遮光壁19、仕切部材18、ラビリンス壁12は図例のように別部材を組合わせたものに限定されず、一体形成されるものであってもよい。
Furthermore, in the present embodiment, an example is shown in which a light shielding wall 19 is provided in the vicinity of the smoke sensing region 15 to prevent light emitted from the light emitting unit 10 from directly entering the light receiving unit 11. Then, an end 12e of the labyrinth wall 12 provided in the portion sandwiched between the light emitting unit 10 and the light receiving unit 11 and facing the smoke sensitive region 15 side, and an opposing end 19a where the light shielding wall 19 faces the labyrinth wall 12 Are connected by a partition member 18, and the partition member 18 constitutes a smoke guiding wall. By the partition member 18, the smoke flowing in from the smoke inlet 14 is guided to the smoke sensitive region 15 without staying in a portion sandwiched between the light emitting unit 10 and the light receiving unit 11.
The shape of the labyrinth wall 12 is not limited to the illustrated example, and the light shielding wall 19, the partition member 18, and the labyrinth wall 12 are not limited to a combination of different members as in the illustrated example, and are integrally formed. It may be done.

以上によれば、煙感知室Sの外周付近に対応する位置に通気孔30aが複数形成された隔離壁30が設けられている、スピーカ4を十分に振動させるために必要な通気性を音孔側4Aだけでなく、煙感知室側4Bも確保することができる。よってスピーカ4の音圧を低下させることなく、十分な音圧で鳴動させることができる。
また、感知器ヘッド5に形成された音孔5aと煙感知室Sの間には、スピーカ4及び隔離壁30が存在するので、音孔5aから入り込む光を遮断することができ、煙感知感度のよいものとすることができる。
図4からも明らかなように隔離壁30に形成された通気孔30aは、ラビリンス壁12とラビリンス壁12の間に形成されている。これによれば、スピーカ4の振動によって煙感知室Sに流入しようとする空気は、通気孔30aを通じて煙感知室Sのラビリンス壁12とラビリンス壁12の間に流入するので、煙感知室Sの感煙領域15に空気が直接流入することを防ぐことができる。よって、スピーカ4が火災警報の鳴動により振動しても、感煙領域15に空気が流入せず、火災を検知しにくくなることを防止して、火災が発生し続けているにも関わらず、スピーカ4による警報音が鳴り止んでしまうといった不具合を防止することができる。
According to the above, the isolation wall 30 in which a plurality of ventilation holes 30a are formed is provided at a position corresponding to the vicinity of the outer periphery of the smoke sensing chamber S, and the sound permeability is sufficient to sufficiently vibrate the speaker 4. Not only the side 4A but also the smoke sensing chamber side 4B can be secured. Therefore, the sound can be produced with sufficient sound pressure without lowering the sound pressure of the speaker 4.
Further, since the speaker 4 and the isolation wall 30 exist between the sound hole 5a formed in the sensor head 5 and the smoke detection chamber S, the light entering from the sound hole 5a can be blocked, and the smoke detection sensitivity. Can be good.
As is clear from FIG. 4, the vent hole 30 a formed in the isolation wall 30 is formed between the labyrinth wall 12 and the labyrinth wall 12. According to this, the air that is about to flow into the smoke sensing chamber S due to the vibration of the speaker 4 flows between the labyrinth wall 12 and the labyrinth wall 12 of the smoke sensing chamber S through the vent hole 30a. It is possible to prevent air from directly flowing into the smoke sensing region 15. Therefore, even if the speaker 4 vibrates due to the sound of the fire alarm, air does not flow into the smoke sensing region 15 and it is difficult to detect the fire. It is possible to prevent a problem that an alarm sound from the speaker 4 stops sounding.

図5、図6は、煙感知器の他の実施形態を示すものあり、図5は光学基台の斜視図、図6は煙感知室の平面図(天井面に取り付けた場合に下方から見た平面図)である。 尚、図5の斜視図は、回路基板(図1参照)に実装されている発光素子L、受光素子PDと固着される前の光学基台1を示しており、図中の矢印d2は空気の流れを示している。図6は回路基板及び隔離壁を備えた防虫カバーと一体になった状態を示しているため、通気孔等を2点鎖線で示している。上述の実施形態と共通する部分は同一の符号を付し、その説明は割愛する。   5 and 6 show another embodiment of the smoke detector. FIG. 5 is a perspective view of the optical base, and FIG. 6 is a plan view of the smoke detection chamber (viewed from below when mounted on the ceiling surface). Plan view). The perspective view of FIG. 5 shows the optical base 1 before being fixed to the light emitting element L and the light receiving element PD mounted on the circuit board (see FIG. 1). Shows the flow. Since FIG. 6 shows a state in which the circuit board and the insect-proof cover provided with the isolation wall are integrated, the air holes and the like are indicated by two-dot chain lines. Portions common to the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.

この実施形態(第2の実施形態)は、上述の実施形態(第1の実施形態)とは、ラビリンス壁12に、通気孔30aに整合させて形成された貫通孔12fが設けられている点が異なり、この実施形態では、該貫通孔12fと通気孔30aが整合するように、隔離壁30に形成された通気孔30aは、ラビリンス壁12とラビリンス壁12の間ではなく、ラビリンス壁12の上部に通じる位置に形成されている点が上述のものとは異なる。
光学基台1の底面1aにはボス部1bが形成されており、回路基板2aと密着することなく、図5に示すように通気孔30a、そして貫通孔12fを通じて流れてきた空気が矢印d2方向へ排気できるよう構成されている。
そして図6に示すように、隔離壁30に形成された通気孔30aは、ラビリンス壁12に対応する位置、即ちこの例では、ラビリンス壁12に形成される貫通孔12fに整合するように形成されている。
This embodiment (second embodiment) is different from the above-described embodiment (first embodiment) in that the labyrinth wall 12 is provided with a through hole 12f formed in alignment with the vent hole 30a. In this embodiment, the vent hole 30a formed in the isolation wall 30 is not between the labyrinth wall 12 and the labyrinth wall 12 so that the through hole 12f and the vent hole 30a are aligned. The point which is formed in the position which leads to the upper part is different from the above-mentioned thing.
A boss 1b is formed on the bottom surface 1a of the optical base 1, and air flowing through the vent hole 30a and the through hole 12f as shown in FIG. It is configured so that it can be exhausted.
As shown in FIG. 6, the vent hole 30 a formed in the isolation wall 30 is formed so as to be aligned with a position corresponding to the labyrinth wall 12, that is, in this example, the through hole 12 f formed in the labyrinth wall 12. ing.

以上によれば、通気孔30aを通じて流入してきた空気を、煙感知室S内に流入させることなく、ラビリンス壁12に形成した貫通孔12fを通じて、煙感知室S外へ排気することができる(図5矢印d2参照)。よって、煙感知室S内に空気が流入せず、スピーカ4の振動に起因して煙感知感度が低下することを防ぐことができる。
ここで、貫通孔12fは、図例のものに限定されず、ひとつのラビリンス壁12に複数設けたものとしてもよく、通気孔30aはこれに整合するようにラビリンス壁12に沿うように複数形成したものとしてもよい。また、貫通孔12fと整合して形成される通気孔30aだけでなく、図4の例のようにラビリンス壁12とラビリンス壁12との間に対応する位置に設けられた通気孔30aを備えたものとしてもよい(即ち、第1の実施形態と第2の実施形態を組合わせた構成)。これによれば、貫通孔12fと整合する通気孔30aに流入した空気は、貫通孔12fを通じて、煙感知室S外へ排気され、ラビリンス壁12とラビリンス壁12との間に対応する位置に設けられた通気孔30aに流入した空気は、感煙領域15に流れ込むことがないので、スピーカ4の振動に起因して煙感知感度が低下することを防ぐことができる。
According to the above, the air flowing in through the vent hole 30a can be exhausted outside the smoke sensing chamber S through the through-hole 12f formed in the labyrinth wall 12 without flowing into the smoke sensing chamber S (FIG. (See 5 arrow d2). Therefore, it is possible to prevent the smoke detection sensitivity from being lowered due to the vibration of the speaker 4 without air flowing into the smoke detection chamber S.
Here, the through hole 12f is not limited to the illustrated example, and a plurality of through holes 12a may be provided in one labyrinth wall 12, and a plurality of vent holes 30a are formed along the labyrinth wall 12 so as to be aligned therewith. It is good also as what you did. Further, not only the vent hole 30a formed in alignment with the through hole 12f but also the vent hole 30a provided at a corresponding position between the labyrinth wall 12 and the labyrinth wall 12 as in the example of FIG. It is good also as a thing (namely, the structure which combined 1st Embodiment and 2nd Embodiment). According to this, the air that has flowed into the vent hole 30a aligned with the through hole 12f is exhausted out of the smoke sensing chamber S through the through hole 12f, and is provided at a position corresponding to between the labyrinth wall 12 and the labyrinth wall 12. Since the air that has flowed into the vent hole 30a does not flow into the smoke sensing region 15, it is possible to prevent the smoke detection sensitivity from being lowered due to the vibration of the speaker 4.

尚、煙感知器Aの組み付け構成や組み付け手順、内部構成等は、上述の例、図示した形状に限定されるものではない。またサーミスタ等の熱感知素子を備えたものとし、煙感知機能だけでなく、熱感知機能を備えた煙感知器Aにも適用可能であることは言うまでもない。   In addition, the assembling configuration, the assembling procedure, the internal configuration, and the like of the smoke detector A are not limited to the above-described example and the illustrated shape. Further, it is assumed that a heat sensing element such as a thermistor is provided, and it is needless to say that the present invention can be applied not only to the smoke sensing function but also to the smoke detector A having the heat sensing function.

本発明の煙感知器の一例を示す縦断面図The longitudinal cross-sectional view which shows an example of the smoke detector of this invention 本発明の煙感知器の分解斜視図The exploded perspective view of the smoke detector of the present invention 本発明の煙感知器に備えられた防虫カバーの斜視図The perspective view of the insect-proof cover with which the smoke detector of this invention was equipped 本発明の煙感知器に備えられた煙感知室の平面図(天井面に取り付けた場合に下方から見た平面図)Plan view of the smoke detection chamber provided in the smoke detector of the present invention (plan view from below when mounted on the ceiling surface) 本発明の煙感知器の別の実施形態であり、煙感知器に備えられた光学基台の斜視図It is another embodiment of the smoke detector of the present invention, and is a perspective view of an optical base provided in the smoke detector. 本発明の煙感知器の別の実施形態であり、煙感知室の平面図(天井面に取り付けた場合に下方から見た平面図)It is another embodiment of the smoke detector of the present invention, and is a plan view of a smoke detection chamber (a plan view seen from below when attached to a ceiling surface)

符号の説明Explanation of symbols

A 煙感知器
1 光学基台
2 ベース部(ベース)
3 防虫カバー
30 隔離壁
30a 通気孔
4 スピーカ
5 感知部ヘッド
10 発光ユニット(発光部)
11 受光ユニット(受光部)
12 ラビリンス壁
15 感煙領域
S 煙感知室
A Smoke detector 1 Optical base 2 Base part (base)
3 Insect-proof cover 30 Isolation wall 30a Vent hole 4 Speaker 5 Sensing part head 10 Light emitting unit (light emitting part)
11 Light receiving unit (light receiving unit)
12 Labyrinth wall 15 Smoke sensing area S Smoke sensing room

Claims (3)

天井面等に取り付けられるベースの下方に、発光部と受光部とを備え複数のラビリンス壁が周設された煙感知室を内装し、該煙感知室の下方にはスピーカを収容した感知部ヘッドを設けた煙感知器において、
上記煙感知室と上記スピーカとの間には、隔離壁を介在させており、該隔離壁には、上記煙感知室内の外周付近に対応する位置に通じる通気孔が複数設けられていることを特徴とする煙感知器。
Below the base attached to the ceiling surface or the like, a smoke sensing chamber having a light emitting portion and a light receiving portion and provided with a plurality of labyrinth walls is provided, and below the smoke sensing chamber, a sensing portion head containing a speaker In the smoke detector with
An isolation wall is interposed between the smoke detection chamber and the speaker, and the isolation wall is provided with a plurality of vent holes leading to positions corresponding to the vicinity of the outer periphery of the smoke detection chamber. Characteristic smoke detector.
請求項1において、
前記通気孔は、前記ラビリンス壁と前記ラビリンス壁との間に対応する位置に通じるよう形成されていることを特徴とする煙感知器。
In claim 1,
The smoke sensor is characterized in that the vent hole is formed so as to communicate with a corresponding position between the labyrinth wall and the labyrinth wall.
請求項1又は請求項2において、
前記ラビリンス壁には、前記通気孔に整合させて形成された貫通孔が設けられていることを特徴とする煙感知器。
In claim 1 or claim 2,
The smoke detector, wherein the labyrinth wall is provided with a through hole formed in alignment with the vent hole.
JP2007160072A 2007-06-18 2007-06-18 smoke detector Expired - Fee Related JP4650455B2 (en)

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JP2011215678A (en) * 2010-03-31 2011-10-27 Nohmi Bosai Ltd Photoelectric smoke sensor
JP2012256250A (en) * 2011-06-09 2012-12-27 Panasonic Corp Smoke sensor
WO2020106398A1 (en) * 2018-11-20 2020-05-28 Carrier Corporation Smoke detector

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JP2005352932A (en) * 2004-06-14 2005-12-22 Hochiki Corp Smoke sensor
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Publication number Priority date Publication date Assignee Title
JP2005352932A (en) * 2004-06-14 2005-12-22 Hochiki Corp Smoke sensor
JP2006040212A (en) * 2004-07-30 2006-02-09 Hochiki Corp Acoustic structure of alarm

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Publication number Priority date Publication date Assignee Title
JP2011215678A (en) * 2010-03-31 2011-10-27 Nohmi Bosai Ltd Photoelectric smoke sensor
JP2012256250A (en) * 2011-06-09 2012-12-27 Panasonic Corp Smoke sensor
WO2020106398A1 (en) * 2018-11-20 2020-05-28 Carrier Corporation Smoke detector
US11322006B2 (en) 2018-11-20 2022-05-03 Carrier Corporation Smoke detector

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