JPS5922521Y2 - Contamination prevention device for light emitting and receiving surfaces of optical fire detectors - Google Patents

Description

【考案の詳細な説明】 この考案はトンネル内などに使用される光学式火災検出
器の投受光面の汚染防止装置に関する。[Detailed Description of the Invention] This invention relates to a contamination prevention device for the light emitting/receiving surface of an optical fire detector used in tunnels and the like.

この種の汚染防止装置として第１図に示すように、投光
部または受光部が収容される光学式火災検出器の筐体１
の投受光面２の前面に筐体１に接して取り付けられる筒
状体１１と、この筒状体１１の内壁に設けられた開口部
９を有する複数個の環状隔壁板４とで構成される汚染防
止装置８が実願昭４９−６３４２号（実開昭５０−９８
６９７号）によって先に提案されている。As shown in FIG. 1, this type of pollution prevention device includes a housing 1 of an optical fire detector in which a light emitting part or a light receiving part is housed.
It consists of a cylindrical body 11 attached to the front surface of the light emitting/receiving surface 2 in contact with the casing 1, and a plurality of annular partition plates 4 having openings 9 provided in the inner wall of the cylindrical body 11. Contamination prevention device 8
No. 697).

しかしこのような汚染防止装置では、光学式火災検出器
を屋外やトンネル内などに設置した場合、雨水や湧水が
開口部９から筒状体１１内に侵入してたまってしまう。However, in such a pollution prevention device, when the optical fire detector is installed outdoors or in a tunnel, rainwater or spring water enters the cylindrical body 11 through the opening 9 and accumulates therein.

このため汚染防止装置が直射日光や日中の温度上昇など
を受けると筒状体１１内にたまっている水が蒸発し、こ
の水蒸気によって投光面２から投射される光あるいは受
光面２に入射しようとする光が減衰されてしまい、光学
式火災検出器は誤動作してしまうかまたは緊急時に動作
しなくなる（失報）問題が生じた。Therefore, when the pollution prevention device is exposed to direct sunlight or a rise in temperature during the day, the water accumulated in the cylindrical body 11 evaporates, and this water vapor causes light to be projected from the light emitting surface 2 or to be incident on the light receiving surface 2. As a result, the light that was intended to be detected was attenuated, causing the optical fire detector to malfunction or fail to operate in an emergency (missing alarm).

この考案は上記の点にかんがみ、雨水や湧水などがたま
って光学式火災検出器を誤動作あるいは失報させるよう
なことのない光学式火災検出器の投受光面の汚染防止装
置を提供するものである。In view of the above points, this invention provides a contamination prevention device for the light emitting and receiving surface of an optical fire detector, which prevents the optical fire detector from malfunctioning or causing false alarms due to accumulation of rainwater or spring water. It is.

以下この考案の１実施例を第２図により説明すると、光
学式火災検出器の投光部または受光部が収容される筐体
１のガラス板またはレンズなどからなる投受光面２の前
面に筐体１に接してはめ込みまたはねし結合などにより
取り付けられる筒状体の内筒３が設けられ、この内筒３
の内壁に開口部：９を有する複数の環状隔壁板４が設け
られ、この隔壁板４によって区画された各室の側壁にそ
れぞれ複数の水抜き用の孔５が設けられる。Hereinafter, one embodiment of this invention will be described with reference to FIG. 2.A housing is installed in front of a light emitting/receiving surface 2 made of a glass plate or a lens of a housing 1 in which a light emitting part or a light receiving part of an optical fire detector is accommodated. An inner cylinder 3 of a cylindrical body that is attached to the body 1 by fitting or screw connection is provided, and this inner cylinder 3
A plurality of annular partition plates 4 having openings 9 are provided on the inner wall of the chamber, and a plurality of drainage holes 5 are provided in the side walls of each chamber partitioned by the partition plates 4.

そしてこの内筒３の外側に端部に開口部９がまた側壁に
複数の水抜き用の孔６が設けられた外筒７が脱着自在に
取り付けられて汚染防止装置８が構成される。An outer cylinder 7 having an opening 9 at its end and a plurality of drainage holes 6 in its side wall is removably attached to the outside of the inner cylinder 3, thereby constructing a contamination prevention device 8.

なおこの装置８の筐体１への取り付けは外筒７によって
行なうようにしてもよい。Note that the device 8 may be attached to the housing 1 using the outer cylinder 7.

このように構成された汚染防止装置８は、雨水や湧水な
どが外筒７の開口部９から内筒３内に入り込むと、これ
らの水は内筒３に設けられた水抜き孔５を通じて内筒３
と外筒７の間の空間に流出し、この空間に流出した水は
外筒７の水抜き孔６を通じて外部に排出される。In the pollution prevention device 8 configured in this way, when rainwater, spring water, etc. enters the inner cylinder 3 through the opening 9 of the outer cylinder 7, this water is drained through the drain hole 5 provided in the inner cylinder 3. Inner cylinder 3
and the outer cylinder 7, and the water flowing into this space is discharged to the outside through the drain hole 6 of the outer cylinder 7.

第３図はこの考案の他の実施例で、内筒３は隔壁板に相
当する底部に開口部９が設けられ外周に鍔状の突部が設
けられたカップ形状の容器１０が複数個連接されて構成
され、連接時に容器１０の突部と底部の連接部分にでき
るすき間が水抜き孔５′として使用される。FIG. 3 shows another embodiment of this invention, in which the inner cylinder 3 has a plurality of cup-shaped containers 10 connected together, each having an opening 9 at the bottom corresponding to a partition plate and a brim-like protrusion on the outer periphery. The gap formed between the protrusion and the bottom of the container 10 when they are connected is used as a drain hole 5'.

そしてこの複数の容器１０からなる内筒３が側壁に水抜
き用の孔６を有する外筒７に収容されて汚染防止装置８
が構成され、この装置８は外筒７によって筐体１に取り
付けられる。The inner cylinder 3 made up of the plurality of containers 10 is housed in an outer cylinder 7 having drain holes 6 in the side wall, and the contamination prevention device 8
This device 8 is attached to the housing 1 by an outer cylinder 7.

なお容器１０の突部は複数個の突片としてもよい。Note that the protrusion of the container 10 may be a plurality of protrusions.

なお、上記実施例において水抜き用の孔５，６は溝状に
形成してもよい。In addition, in the above embodiment, the water drainage holes 5 and 6 may be formed in the shape of a groove.

また内筒３の水抜き用の孔５，５′と外筒７の水抜き用
の孔６．とを互いに偏位して設けるようにすると、これ
らの孔５，５′と６を通じて外光が内筒３内に入るのを
防止することができる。Also, drain holes 5 and 5' in the inner cylinder 3 and drain holes 6 in the outer cylinder 7. By providing the holes 5, 5' and 6 offset from each other, external light can be prevented from entering the inner cylinder 3 through the holes 5, 5' and 6.

この考案によれば、光学式火災検出器を屋外やトンネル
内などに設置した場合に雨水や湧水などがたまることの
ない、従って検出器に悪影響を与えることのない光学式
火災検出器の投受光面の汚染防止装置が得られる。According to this invention, when an optical fire detector is installed outdoors or in a tunnel, rainwater or spring water will not accumulate, and therefore will not have a negative effect on the detector. A device for preventing contamination of the light receiving surface is obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の汚染防止装置の縦断面図、第２図と第３
図はこの考案による光学式火災検出器の投受光面の汚染
防止装置の異なる実施例の縦断面図である。 １・・・・・・筐体、２・・・・・・投受光面、３・・
・・・・内筒、４・・・・・・環状隔壁板、５，５’、
６・・・・・・水抜き用の孔、７・・・・・・外筒、８
・・・・・・汚染防止装置、９・・・・・・開口部、１
０・・・・・・カップ形状の容器。Figure 1 is a vertical sectional view of a conventional pollution prevention device, Figures 2 and 3 are
The figure is a longitudinal sectional view of a different embodiment of the device for preventing contamination of the light emitting and receiving surfaces of an optical fire detector according to this invention. 1... Housing, 2... Light emitting/receiving surface, 3...
... Inner cylinder, 4 ... Annular partition plate, 5, 5',
6...Drainage hole, 7...Outer cylinder, 8
...Pollution prevention device, 9...Opening, 1
0...Cup-shaped container.

Claims (1)

【実用新案登録請求の範囲】 １ 光学式火災検出器の投光部または受光部が収容され
る筺体１の投受光面２の前面に筐体１に接して取り付け
られ“る汚染防止装置であって、内筒３と外筒７の２重
筒か□らなり、上記内筒３の内壁には複数の環状隔壁板
４が設けられ、上記内筒３と外筒７の各側壁にはそれぞ
れ複数の水抜き用の孔５，５’、６が設けられたことを
特徴とする光学式火災検出器の投受光面の汚染防止装置
。 ２ 内筒３が底部に開口部９を有し周縁に突部を有する
カップ形状の容器１０が複数個連接ξれて構成され、上
記複数の容器１０の各連接部分に形成されるすき間が水
抜き孔５′である実用新案登録請求の範囲第１項記載の
光学式火災検出器の投受光面の汚染防止装置。 ３ 内筒３の水抜き孔５，５′と外筒７の水抜き孔６と
が互いに偏位されて設けられる実用新案登録請求の範囲
第１項または第２項記載の光学式火災検出器の投受光面
の汚染防止装置。[Scope of Claim for Utility Model Registration] 1. A pollution prevention device that is attached to the front surface of the light emitting/receiving surface 2 of the casing 1 in which the light emitting part or the light receiving part of an optical fire detector is housed, in contact with the casing 1. It consists of a double cylinder of an inner cylinder 3 and an outer cylinder 7, and a plurality of annular partition plates 4 are provided on the inner wall of the inner cylinder 3, and a plurality of annular partition plates 4 are provided on each side wall of the inner cylinder 3 and outer cylinder 7, respectively. A contamination prevention device for the light emitting/receiving surface of an optical fire detector, characterized in that a plurality of drainage holes 5, 5', and 6 are provided.2 The inner cylinder 3 has an opening 9 at the bottom and the peripheral edge Utility model registration claim 1, wherein a plurality of cup-shaped containers 10 each having a protrusion are connected to each other, and a gap formed in each connected portion of the plurality of containers 10 is a drain hole 5'. A device for preventing contamination of the light emitting/receiving surface of an optical fire detector as described in 3. Utility model registration in which the drain holes 5, 5' of the inner tube 3 and the drain hole 6 of the outer tube 7 are offset from each other. A contamination prevention device for a light emitting and receiving surface of an optical fire detector according to claim 1 or 2.