JPH029429Y2 - - Google Patents
Info
- Publication number
- JPH029429Y2 JPH029429Y2 JP1982077037U JP7703782U JPH029429Y2 JP H029429 Y2 JPH029429 Y2 JP H029429Y2 JP 1982077037 U JP1982077037 U JP 1982077037U JP 7703782 U JP7703782 U JP 7703782U JP H029429 Y2 JPH029429 Y2 JP H029429Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- smoke
- intermediate electrode
- dish
- external electrode
- 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
- 239000000779 smoke Substances 0.000 claims description 29
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 3
- 238000000752 ionisation method Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 description 11
- 230000007423 decrease Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
Description
【考案の詳細な説明】
本考案は、イオン化式煙感知器の耐風構造に関
する。[Detailed Description of the Invention] The present invention relates to a wind-resistant structure of an ionization type smoke detector.
イオン化式煙感知器は、中間電極と外部電極間
の空間を放射性物質によつてイオン化させ、該空
間中に煙が侵入したときのイオン電流の変化によ
つて煙を検出する感知器である。中間電極と外部
電極間には、空気は自由に侵入できることが必要
である。しかし、この空間に侵入する空気の流速
が大きいときは、同一の煙濃度に対するイオン電
流の変化が減少し、煙感知に対する感度が低下す
るという欠点がある。 An ionization type smoke sensor is a sensor that ionizes a space between an intermediate electrode and an external electrode with a radioactive substance, and detects smoke based on a change in ion current when smoke enters the space. It is necessary that air can freely enter between the intermediate electrode and the outer electrode. However, when the flow rate of air entering this space is high, the change in ion current for the same smoke concentration decreases, resulting in a disadvantage that the sensitivity to smoke detection decreases.
上述の欠点を軽減するために、第１図に示すよ
うに、中間電極２を凹部２ａを有する皿状に形成
し、外部電極１の開口部１ａから流入した煙を中
間電極２の凹部２ａに滞留させるようにして、空
気流による感度低下を防ぐようにした構造が知ら
れている。この場合、開口部１ａは、中間電極２
の周縁端部２ｂよりも図中下方に穿設されていて
空気流は開口部１ａ間を自由に流通することがで
きるが、煙は凹部２ａに滞留するから空気流によ
る感度低下をある程度防ぐことができる。なお、
同図中３は放射性物質を含む内部電極であり、４
は該内部電極を囲み、かつ、中間電極を支持する
絶縁性の筒、５は天井等への取付面である。 In order to alleviate the above-mentioned drawbacks, as shown in FIG. A structure is known in which the air is allowed to stagnate in order to prevent a decrease in sensitivity due to air flow. In this case, the opening 1a is the intermediate electrode 2
Although the airflow can freely flow between the openings 1a in the figure below the peripheral edge 2b of the opening 1a, since smoke remains in the recess 2a, a decrease in sensitivity due to the airflow can be prevented to some extent. Can be done. In addition,
In the figure, 3 is an internal electrode containing radioactive material;
5 is an insulating cylinder surrounding the internal electrode and supporting the intermediate electrode, and 5 is a mounting surface to the ceiling or the like.
上述の従来構造は、空気の流速がある程度以下
のとき、例えば毎秒2m程度であれば十分効果を
発揮する。しかし、最近においては、電子計算
機、ロボツト等の内部に煙感知器を内蔵させたも
のが出現している。電子計算機等は、内部の電子
部品から発生する熱を放散させ、一定温度以下に
保つために、冷却用のフアン等を内蔵しており、
機内には高速の空気流が発生している。この空気
流は一般に毎秒5m程度の流速であるから上述の
従来構造によつては十分な効果を発揮することが
不可能である。 The above-described conventional structure is sufficiently effective when the air flow velocity is below a certain level, for example, about 2 meters per second. However, recently, electronic computers, robots, and the like have come into existence that have smoke detectors built into them. Electronic computers, etc. have built-in cooling fans to dissipate heat generated from internal electronic components and keep the temperature below a certain level.
There is a high-speed airflow inside the aircraft. Since this air flow generally has a flow velocity of about 5 m/s, it is impossible to achieve sufficient effects with the above-mentioned conventional structure.
本考案の目的は、上述の事情に鑑み、従来の欠
点を解決して、毎秒10m程度までの空気流中であ
つても使用することができるイオン化式煙感知器
の耐風構造を提供することにある。 In view of the above-mentioned circumstances, the purpose of the present invention is to solve the conventional drawbacks and provide a wind-resistant structure for an ionization smoke detector that can be used even in air flows of up to 10 meters per second. be.
本考案の耐風構造は、少なくとも、周縁部が起
立した壁面をなし、該壁面により周囲を囲繞して
内側を凹部となした皿状の中間電極と、該皿状の
中間電極を覆う外部電極とを有し、該両電極で挟
まれた空間を放射線によりイオン化して両電極間
に流れるイオン電流の煙による変化により煙を検
出するイオン化式煙感知器において、前記空間に
煙を流入させる開口部を上記皿状の中間電極の壁
面と対面する上記外部電極の周囲に穿設すると共
に、前記外部電極より突出してその先端が前記皿
状の中間電極の凹部内に位置する棒状の導電体を
設けたことを特徴とする。 The wind-resistant structure of the present invention includes at least a dish-shaped intermediate electrode that has a wall surface with an upright peripheral edge, is surrounded by the wall surface, and has a recess on the inside, and an external electrode that covers the dish-shaped intermediate electrode. In an ionization smoke sensor that ionizes the space between the two electrodes with radiation and detects smoke by changes in the ionic current flowing between the two electrodes due to the smoke, an opening that allows smoke to flow into the space. is provided around the external electrode facing the wall surface of the dish-shaped intermediate electrode, and a rod-shaped conductor is provided that protrudes from the external electrode and has its tip located within the recess of the dish-shaped intermediate electrode. It is characterized by:
次に、本考案について、図面を参照して詳細に
説明する。 Next, the present invention will be explained in detail with reference to the drawings.
第２図は、本考案の一実施例を示す断面図あ
る。すなわち、皿状の中間電極２は、周縁部が起
立した壁面２ｄとなつており、この壁面２ｄによ
り周囲を囲繞して内部を凹部２ａとしている。外
部電極１は、この皿状の中間電極２を覆うと共
に、上記中間電極の壁面２ｄと対面する周囲には
煙を内部に流入させる開口部１ａが穿設されてお
り、この開口部１ａは、皿状の中間電極２の周縁
端部２ｂより図中上部に位置する。 FIG. 2 is a sectional view showing an embodiment of the present invention. That is, the dish-shaped intermediate electrode 2 has a wall surface 2d with an upright peripheral edge, and is surrounded by the wall surface 2d to form a recessed portion 2a inside. The external electrode 1 covers the dish-shaped intermediate electrode 2, and has an opening 1a formed in the periphery facing the wall surface 2d of the intermediate electrode to allow smoke to flow into the interior. It is located above the peripheral edge 2b of the dish-shaped intermediate electrode 2 in the figure.
従つて中間電極２の周縁端部２ｂを含む平面２Ｃ
と外部電極１の底面１ｂ間には開口部１ａが穿設
されていない。しかし、開口部の僅かな一部分が
上記平面２Ｃの図中下方にまたがることは差支え
ない。そして、外部電極１の底面１ｂの中央に
は、棒状の導電体としてのねじ１Ｃを突設してい
て、該ねじ１Ｃの先端部は前記中間電極２の凹部
２ａ内に侵入している。ねじ１Ｃをドライバー等
で回転させれば突出部の長さは調整可能である。
外部電極１の上縁は天井取付面５に固着され、内
部電極３は、絶縁筒４で囲まれていて煙の侵入は
僅少である。中間電極２の底面は、上記絶縁筒４
の下端縁に固着している。またその中央部には小
孔が穿設されていて、内部電極３上に固着された
放射性物質が発生する放射線が通過して中間電極
２と外部電極１間の空間をイオン化する。中間電
極２に近接して外部電極１より突設した導電体の
ねじ１Ｃの先端部に電気力線が集中するため、中
間電極２と外部電極１間に流れるイオン電流は、
主としてこの部分に流れ、従つて凹部２ａ内に滞
留した煙がインピーダンスの変化に多く寄与す
る。開口部１ａから流入した空気は、主として皿
状の中間電極２の周縁に沿つて流れ反対側の開口
部から流出し、一部は中間電極２の周縁端部２ｂ
と外部電極１の底面１ｂとの間を通る。そして、
空気中に含まれる煙は凹部２ａ内に滞留するが、
この部分には空気流がない。そして、イオン電流
が上述のように、主としてねじ１Ｃの先端部に集
中して流れるから、イオン電流の変化は、主とし
て滞留した煙濃度によつて変化し、空気の流速に
よる影響は少ない。Therefore, the plane 2C including the peripheral edge portion 2b of the intermediate electrode 2
No opening 1a is formed between the bottom surface 1b of the external electrode 1 and the bottom surface 1b of the external electrode 1. However, a small portion of the opening may extend below the plane 2C in the drawing. A screw 1C serving as a rod-shaped conductor is protruded from the center of the bottom surface 1b of the external electrode 1, and the tip of the screw 1C penetrates into the recess 2a of the intermediate electrode 2. The length of the protrusion can be adjusted by rotating the screw 1C with a screwdriver or the like.
The upper edge of the external electrode 1 is fixed to the ceiling mounting surface 5, and the internal electrode 3 is surrounded by an insulating tube 4, so that smoke can hardly enter. The bottom surface of the intermediate electrode 2 is connected to the insulating cylinder 4.
It is attached to the lower edge of the. A small hole is bored in the center of the hole, through which radiation generated by the radioactive substance fixed on the internal electrode 3 passes through and ionizes the space between the intermediate electrode 2 and the external electrode 1. Since the electric lines of force are concentrated at the tip of the conductor screw 1C protruding from the external electrode 1 in the vicinity of the intermediate electrode 2, the ionic current flowing between the intermediate electrode 2 and the external electrode 1 is as follows.
The smoke that mainly flows in this part and therefore stays in the recess 2a contributes to the change in impedance. The air flowing in from the opening 1a mainly flows along the periphery of the dish-shaped intermediate electrode 2 and flows out from the opening on the opposite side, and a part of the air flows along the peripheral edge 2b of the intermediate electrode 2.
and the bottom surface 1b of the external electrode 1. and,
Smoke contained in the air stays in the recess 2a,
There is no airflow in this area. As described above, since the ionic current mainly flows in a concentrated manner at the tip of the screw 1C, the ionic current changes mainly depending on the concentration of the accumulated smoke, and is less influenced by the air flow velocity.
第３図は、第１図に示すような従来構造のイオ
ン化式煙感知器および第２図に示した本実施例の
感知器の電気的感度を、空気流の流速を変化させ
て比較した実験結果を示す。図中実線は本実施例
の感知器の感度を示し、点線は従来構造の感知器
感度を示す。なお、煙濃度は一定として、両感知
器とも流速０の時の感度を１として示されてい
る。同図から理解されるように、従来の感知器
は、毎秒２〜3mの流速までは十分使用できるが、
それ以上の流速では感度低下が大である。しかし
本実施例によるときは、ほぼ毎秒10mの流速まで
殆んど感度低下せず、高速の空気流中においても
十分使用することができる効果がある。 Figure 3 shows an experiment in which the electrical sensitivity of the conventional ionization type smoke detector shown in Figure 1 and the sensor of this embodiment shown in Figure 2 were compared by varying the flow velocity of the air flow. Show the results. In the figure, the solid line indicates the sensitivity of the sensor of this embodiment, and the dotted line indicates the sensitivity of the sensor of the conventional structure. Note that, assuming that the smoke concentration is constant, both sensors are shown with sensitivity of 1 when the flow velocity is 0. As can be understood from the figure, conventional sensors can be used satisfactorily up to flow velocities of 2 to 3 meters per second.
At a flow rate higher than that, the sensitivity decreases significantly. However, according to this embodiment, there is almost no decrease in sensitivity up to a flow velocity of approximately 10 m/s, and there is an effect that it can be used satisfactorily even in high-speed air flow.
以上のように、本考案においては、外部電極の
開口部を中間電極の周縁端部より上部に設けて、
空気流は主として中間電極の周縁外周に沿つて流
れるように構成したから、中間電極の凹部内に煙
が滞留する。しかも外部電極に棒状の導電体を突
設し、該導電体の先端部を前記中間電極の凹部内
に侵入させた構造としたから、中間電極と外部電
極間に流れるイオン電流が主として上記導電体の
先端部に集中して流れ、流速の早い部分の影響が
少ない。すなわち、高風速中においても感度低下
が小で、煙を検出することができる効果がある。
冷却用フアン等によつて空気流が存在する電子計
算機等の内部の煙感知器として使用することが可
能である。 As described above, in the present invention, the opening of the external electrode is provided above the peripheral edge of the intermediate electrode,
Since the airflow is configured to flow mainly along the outer periphery of the intermediate electrode, smoke remains in the recessed portion of the intermediate electrode. Moreover, since the structure is such that a rod-shaped conductor is protruded from the external electrode and the tip of the conductor is inserted into the recess of the intermediate electrode, the ionic current flowing between the intermediate electrode and the external electrode is mainly caused by the conductor. The flow is concentrated at the tip of the tube, and there is little influence from areas where the flow velocity is high. That is, there is an effect that smoke can be detected with a small decrease in sensitivity even during high wind speeds.
It can be used as a smoke detector inside an electronic computer or the like where airflow is present due to a cooling fan or the like.
第１図は従来のイオン化式煙感知器の耐風構造
の一例を示す断面図、第２図は本考案の一実施例
を示す断面図、第３図は上記実施例の構造と従来
構造による感知器の流速による感度低下を比較し
た実験結果を示す図である。
図において、１……外部電極、２……中間電
極、３……内部電極、４……絶縁筒、５……天井
取付面、１ａ……開口部、１ｂ……外部電極の底
面、１Ｃ……ねじ、２ａ……中間電極の凹部、２
ｂ……皿状の中間電極の周縁端部、２Ｃ……中間
電極の周縁端部を含む平面。
Fig. 1 is a sectional view showing an example of the wind-resistant structure of a conventional ionization smoke detector, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. 3 shows the structure of the above embodiment and the conventional structure. FIG. 3 is a diagram showing the results of an experiment comparing the decrease in sensitivity depending on the flow rate of the device. In the figure, 1... External electrode, 2... Intermediate electrode, 3... Internal electrode, 4... Insulating cylinder, 5... Ceiling mounting surface, 1a... Opening, 1b... Bottom surface of external electrode, 1C... ...screw, 2a...recess of intermediate electrode, 2
b...peripheral end of the dish-shaped intermediate electrode, 2C...plane including the peripheral end of the intermediate electrode.
Claims (1)
壁面により周囲を囲繞して内側を凹部となした皿
状の中間電極と、該皿状の中間電極を覆う外部電
極とを有し、該両電極で挟まれた空間を放射線に
よりイオン化して両電極間に流れるイオン電流の
煙による変化により煙を検出するイオン化式煙感
知器において、前記空間に煙を流入させる開口部
を上記皿状の中間電極の壁面と対面する上記外部
電極の周囲に穿設すると共に、前記外部電極より
突出してその先端が前記皿状の中間電極の凹部内
に位置する棒状の導電体を設けたことを特徴とす
るイオン化式煙感知器の耐風構造。 At least a dish-shaped intermediate electrode having a wall surface with an upright peripheral edge, surrounded by the wall surface and having a concave portion on the inside, and an external electrode covering the dish-shaped intermediate electrode; In an ionization type smoke sensor that detects smoke by ionizing the space between the two electrodes with radiation and changing the ionic current flowing between the two electrodes due to the smoke, the opening through which smoke flows into the space is connected to the dish-shaped intermediate electrode. An ionization method characterized in that a rod-shaped conductor is provided around the external electrode facing the wall surface of the electrode, and protrudes from the external electrode and has a tip positioned in the recess of the dish-shaped intermediate electrode. Windproof structure of type smoke detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7703782U JPS58180463U (en) | 1982-05-27 | 1982-05-27 | Windproof structure of ionization smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7703782U JPS58180463U (en) | 1982-05-27 | 1982-05-27 | Windproof structure of ionization smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58180463U JPS58180463U (en) | 1983-12-02 |
| JPH029429Y2 true JPH029429Y2 (en) | 1990-03-08 |
Family
ID=30086315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7703782U Granted JPS58180463U (en) | 1982-05-27 | 1982-05-27 | Windproof structure of ionization smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58180463U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5041826U (en) * | 1973-08-11 | 1975-04-28 | ||
| JPS5635819U (en) * | 1979-08-11 | 1981-04-07 | ||
| JPS575569U (en) * | 1980-06-12 | 1982-01-12 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5468678U (en) * | 1977-10-18 | 1979-05-16 | ||
| JPS54112192U (en) * | 1978-01-26 | 1979-08-07 | ||
| JPS54172794U (en) * | 1978-05-25 | 1979-12-06 |
-
1982
- 1982-05-27 JP JP7703782U patent/JPS58180463U/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5041826U (en) * | 1973-08-11 | 1975-04-28 | ||
| JPS5635819U (en) * | 1979-08-11 | 1981-04-07 | ||
| JPS575569U (en) * | 1980-06-12 | 1982-01-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58180463U (en) | 1983-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3488431B2 (en) | Sensor | |
| CA1091826A (en) | Ionisation detector chamber | |
| JPH029429Y2 (en) | ||
| CA1267735A (en) | Ionization type-smoke detector | |
| US4150373A (en) | Ionization particle detector | |
| US4017733A (en) | Ionization type smoke sensor | |
| US4171486A (en) | Ionization smoke detector with controlled sensitivity | |
| IL32330A (en) | Ionisation fire alarm | |
| JPH03196292A (en) | Ionization type smoke sensor | |
| US4439683A (en) | Ionization smoke detector | |
| JPS6137117Y2 (en) | ||
| US4286160A (en) | Ionization particle detector | |
| US4227085A (en) | Ionization-type particle detector | |
| EP0156915A1 (en) | Ionization type smoke sensor | |
| JPS6222951A (en) | Indoor type temperature sensor | |
| JPH0219902Y2 (en) | ||
| CA1137654A (en) | Ionization particle detector | |
| US4220862A (en) | Ionization chamber for a smoke detector having an improved arrangement for capturing airborne combustion products | |
| US4618777A (en) | Outer electrode with improved smoke entry | |
| JPH0526508Y2 (en) | ||
| GB1581236A (en) | Ionisation detector chamber | |
| JPH0624956Y2 (en) | Ionization type smoke detector mounting structure | |
| JPS58189954U (en) | ionization smoke detector | |
| JPH0610475Y2 (en) | Ionized smoke detector | |
| JPH0321003Y2 (en) |