JPH0462118B2 - - Google Patents
Info
- Publication number
- JPH0462118B2 JPH0462118B2 JP8648185A JP8648185A JPH0462118B2 JP H0462118 B2 JPH0462118 B2 JP H0462118B2 JP 8648185 A JP8648185 A JP 8648185A JP 8648185 A JP8648185 A JP 8648185A JP H0462118 B2 JPH0462118 B2 JP H0462118B2
- Authority
- JP
- Japan
- Prior art keywords
- airflow
- plate
- alarm
- light receiving
- projecting
- 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.)
- Expired
Links
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 4
- 238000010186 staining Methods 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 1
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Burglar Alarm Systems (AREA)
- Fire-Detection Mechanisms (AREA)
Description
【発明の詳細な説明】
〔技術分野〕
この発明は、投、受光部の汚損防止手段を備え
た火災あるいは防盗装置の警報器に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an alarm for a fire or theft prevention device, which is equipped with means for preventing contamination of the projecting and receiving sections.
従来、例えば道路トンネル内に設けられる輻射
式火災検知器では、第4図に示されるように、ト
ンネル側壁1に突出された受光窓21′の換気流
3に対して上流側に板状の防塵板22′を設けて
いた。この防塵板22′に浮遊塵埃が衝突し落下
して、受光窓21′が汚れるのを遅らせ精掃回数
を少なくしていた。
Conventionally, in a radiation type fire detector installed in a road tunnel, for example, as shown in FIG. A plate 22' was provided. Floating dust collides with and falls on this dust-proof plate 22', thereby preventing the light-receiving window 21' from getting dirty, thereby reducing the number of times of cleaning.
しかし板状の防塵板22′を設けたものでは、
気流3が防塵板22′を乗り越える際、その下流
側が負圧となり矢印31′で示すように気流が降
下してしまうので、気流の主流は矢印32′で示
すような流れとなり、防塵板22′の高さよりや
や高い位置までしか受光窓21′に塵埃が付着さ
れるのを防止することができない。従つて視野の
広い検知器では、防塵板を設けることにより視野
が制限され検知器の機能を低下させることもあつ
た。
However, in the case where a plate-shaped dustproof plate 22' is provided,
When the airflow 3 overcomes the dustproof plate 22', the downstream side becomes negative pressure and the airflow falls as shown by the arrow 31', so the main flow of the airflow becomes the flow shown by the arrow 32', and the dustproof plate 22' It is possible to prevent dust from adhering to the light receiving window 21' only up to a position slightly higher than the height of the light receiving window 21'. Therefore, in a detector having a wide field of view, the provision of a dustproof plate limits the field of view and sometimes reduces the functionality of the detector.
この発明の上記の点にかんがみ、投、受光部の
気流の流れに対して上流側に、直接気流が投、受
光部に衝突しないような上昇気流が発生させるV
字・H字またはコ字状の変更板を設けるようにし
たことを特徴とするものである。
In view of the above points of the present invention, V
This is characterized by the provision of a change plate in the shape of an H-shape, an H-shape, or a U-shape.
この発明の警報器は上記特徴ある構成にしたこ
とにより、V字、H字またはコ字状の変更板の内
側を流れる気流がその先端において衝突し乗り越
えその下流側で負圧が発生するが、変更板の外側
に流れる気流が回り込んで持ち上げることにより
上昇気流が発生させるので、この変更板のほぼ倍
の高さまで投、受光部が保護されるこことなる。
Due to the above-mentioned characteristic configuration of the alarm device of the present invention, the airflow flowing inside the V-shaped, H-shaped, or U-shaped change plate collides at the tip and overcomes the change plate, and negative pressure is generated on the downstream side. The airflow flowing outside the change plate wraps around and lifts it up, generating an upward air current, so that the light emitting and light receiving parts are protected up to almost twice the height of the change plate.
以下この発明の一実施例を第1図および第2図
により説明する。1は道路トンネルの側壁、2は
太陽電池などが設けられた輻射式の火災検知器
で、その受光部としての受光窓21が側壁1より
突出するように設けられる。22はV字状の変更
板で、受光窓21と気流3の流れに対して上流側
に、直接気流が受光窓21に衝突しないような上
昇気流が発生するようにV字状の開放端側が気流
3の上流側に向けて設けられる。上記気流3は、
トンネル内を一定方向に流れる風速2〜8m/s
の換気流である。
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 1 is a side wall of a road tunnel, and 2 is a radiation type fire detector equipped with a solar cell, etc., and a light receiving window 21 serving as a light receiving portion thereof is provided so as to protrude from the side wall 1. Reference numeral 22 denotes a V-shaped change plate, and the open end side of the V-shape is arranged on the upstream side with respect to the flow of the light receiving window 21 and the airflow 3 so that an upward airflow is generated so that the airflow does not directly collide with the light receiving window 21. It is provided toward the upstream side of the airflow 3. The airflow 3 is
Wind speed flowing in a certain direction inside the tunnel is 2 to 8 m/s
ventilation flow.
次に上記変更板22の作用を説明する。トンネ
ル側壁1に沿つて一定方向から流れる換気流3
は、火災検知器2に設けられた変更板22におい
て、その板壁の内側と外側を流れる気流に分けら
れる。変更板22の内側に流れる浮遊塵埃を含ん
だ主気流は、変更板22を乗り越える際、その2
次側に負圧が発生し矢印31で示すような流れと
なるが、変更板22の外側を流れる気流は速度を
増して左右から負圧の部分に矢印33で示すよう
に流れ込み衝突上昇するので、上記矢印31で示
される主気流は持ち上げられ矢印32で示すよう
な上昇気流が発生する。この場合、変更板22の
高さのほぼ倍の高さまで上昇される。 Next, the operation of the change plate 22 will be explained. Ventilation flow 3 flowing from a certain direction along the tunnel side wall 1
In the changing plate 22 provided in the fire detector 2, the airflow is divided into airflows flowing inside and outside the plate wall. When the main airflow containing floating dust flowing inside the change plate 22 crosses over the change plate 22,
Negative pressure is generated on the next side, resulting in a flow as shown by the arrow 31, but the airflow flowing outside the changing plate 22 increases its speed and flows into the negative pressure area from the left and right as shown by the arrow 33, colliding and rising. , the main airflow indicated by the above-mentioned arrow 31 is lifted up, and an upward airflow as indicated by the arrow 32 is generated. In this case, the height is raised to approximately twice the height of the change plate 22.
第3図は変更板22をH字状に形成し、その一
方のコ字状の開放端側を受光部としての受光窓2
1に向けて、また、他方の開放端側を気流3の上
流側に向けて設けた場合の実施例で、変更例22
の内側を流れる気流31が外側を流れる気流33
が持ち上げられ、矢印32で示すような上昇気流
が発生することは、第1図、第2図の実施例と同
様である。またこのような作用は、変更板22を
コ字状に形成した場合にも同様に発生する。 In FIG. 3, the changing plate 22 is formed into an H-shape, and one U-shaped open end side is a light receiving window 2 as a light receiving part.
1, and the other open end side is provided toward the upstream side of the airflow 3.
The airflow 31 flowing inside the airflow 33 flowing outside
This is similar to the embodiments shown in FIGS. 1 and 2, and an upward air current as shown by the arrow 32 is generated. Further, such an effect similarly occurs when the change plate 22 is formed in a U-shape.
更に上記実施例では、道路トンネル内に設けら
れる輻射式の火災検知器に実施した場合について
説明したが、同様の受光窓または反射鏡などの受
光部または投光部を備えた他の火災報知機または
防盗装置の検知器、すなわち気流中に含まれる浮
遊塵埃によつて汚損されやすい投、受光部を備え
た警報器に実施することができる。 Furthermore, in the above embodiment, a case was described in which the radiation type fire detector is installed in a road tunnel, but other fire alarms equipped with a similar light-receiving part or light-emitting part such as a light-receiving window or a reflector can also be used. Alternatively, the present invention can be implemented in a detector for an anti-theft device, that is, an alarm equipped with an emitting and light-receiving section that is easily contaminated by airborne dust contained in the airflow.
この発明の警報器は以上のように構成され動作
するので、変更板の内側に流れる気流がその先端
において板を乗り越える際、負圧を発生し降下し
ようとするが、板の外側を流れる気流が回り込ん
で持ち上げ上昇気流を発生させるので、この変更
板のほぼ倍の高さまで投、受光部が保護される
投、受光部の汚損防止手段を備えた警報器が得ら
れる効果がある。
The alarm of this invention is configured and operates as described above, so when the airflow flowing inside the change plate overcomes the plate at its tip, it generates negative pressure and tries to descend, but the airflow flowing outside the plate Since it wraps around and generates an upward air current, it is possible to obtain an alarm device that protects the projection and light-receiving sections up to almost twice the height of the change plate, and has means for preventing staining of the light-receiving sections.
第1図はこの発明の警報器を道路トンネルの側
壁に取り付けた場合の断面図、第2図は第1図の
警報器の斜視図、第3図は他の実施例の斜視図、
第4図は従来の警報器の斜視図である。
1……トンネル側壁、2……火災検知器、21
……受光窓、22……変更板、3……気流。
FIG. 1 is a sectional view of the alarm device of the present invention installed on the side wall of a road tunnel, FIG. 2 is a perspective view of the alarm device of FIG. 1, and FIG. 3 is a perspective view of another embodiment.
FIG. 4 is a perspective view of a conventional alarm device. 1...Tunnel side wall, 2...Fire detector, 21
...Light receiving window, 22...Change plate, 3...Airflow.
Claims (1)
るいは壁面に、投、受光部が突出されて設けられ
る火災あるいは防盗装置の輻射あるいは光学式の
警報器において、上記投、受光部の気流の流れに
対して上流側に、直接気流が投、受光部に衝突し
ないような上昇気流を発生させる変更板を設けた
ことを特徴とする投、受光部の汚損防止手段を備
えた警報器。 2 変更板がV字状に形成され、かつその開放端
側が気流の流れに対して上流側を向くように設け
られた特許請求の範囲第1項記載の投、受光部の
汚損防止手段を備えた警報器。 3 変更板がH字状に形成され、かつその一方の
コ字状の開放端側が投、受光部に向けられ、ま
た、他方のコ字状の開放端側が気流の上流側に向
けられた特許請求の範囲第1項記載の投、受光部
の汚損防止手段を備えた警報器。 4 変更板がコ字状に形成された特許請求の範囲
第1項記載の投、受光部の汚損防止手段を備えた
警報器。[Claims] 1. In a radiation or optical alarm for a fire or theft prevention device in which a projecting or receiving part is provided on the ceiling or wall of a building through which airflow flows from a certain direction, A change plate is provided on the upstream side of the airflow of the projector to generate an upward airflow so that the airflow does not directly collide with the projector and receiver. alarm. 2. The changing plate is formed in a V-shape, and is provided with a means for preventing staining of the projecting and light-receiving sections as set forth in claim 1, with the open end thereof facing upstream with respect to the flow of airflow. alarm. 3. A patent in which the change plate is formed in an H-shape, with one U-shaped open end facing the projecting and light receiving sections, and the other U-shaped open end facing the upstream side of the airflow. An alarm device comprising means for preventing contamination of the emitting and light receiving portions as set forth in claim 1. 4. An alarm device equipped with means for preventing staining of the projecting and light receiving sections as set forth in claim 1, wherein the changing plate is formed in a U-shape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8648185A JPS61246897A (en) | 1985-04-24 | 1985-04-24 | Alarm with mounting prevention means at projecting/light receiving section |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8648185A JPS61246897A (en) | 1985-04-24 | 1985-04-24 | Alarm with mounting prevention means at projecting/light receiving section |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61246897A JPS61246897A (en) | 1986-11-04 |
JPH0462118B2 true JPH0462118B2 (en) | 1992-10-05 |
Family
ID=13888163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8648185A Granted JPS61246897A (en) | 1985-04-24 | 1985-04-24 | Alarm with mounting prevention means at projecting/light receiving section |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61246897A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5236555B2 (en) * | 2009-03-31 | 2013-07-17 | 能美防災株式会社 | smoke detector |
-
1985
- 1985-04-24 JP JP8648185A patent/JPS61246897A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS61246897A (en) | 1986-11-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |