JPS5836049Y2 - temperature detector - Google Patents
temperature detectorInfo
- Publication number
- JPS5836049Y2 JPS5836049Y2 JP10182477U JP10182477U JPS5836049Y2 JP S5836049 Y2 JPS5836049 Y2 JP S5836049Y2 JP 10182477 U JP10182477 U JP 10182477U JP 10182477 U JP10182477 U JP 10182477U JP S5836049 Y2 JPS5836049 Y2 JP S5836049Y2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- tube
- sensing element
- temperature sensor
- pressure
- 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
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Description
【考案の詳細な説明】
この考案は検知素子の感度・並びに布設作業性を改良し
た温度検知器に関する。[Detailed Description of the Invention] This invention relates to a temperature sensor in which the sensitivity of the detection element and the installation workability are improved.
従来より広範囲の監視領域を持つ温度検知器として、熱
可塑性プラスチックチューブからなる検知素子内に流体
による内圧を与えておいて周囲温度の上昇に伴って上記
チューブが軟化したとき内圧によって該チューブが局部
的に膨張遂には破裂するようにし、このときの内圧の低
下に基づいて周囲の温度上昇を検知する温度検知器が公
知である。As a temperature sensor that has a wider monitoring area than before, internal pressure is applied by fluid to the sensing element made of a thermoplastic tube, and when the tube softens as the ambient temperature rises, the internal pressure causes the tube to localize. There is a well-known temperature sensor which detects an increase in ambient temperature based on the drop in internal pressure that occurs when the tube expands and eventually ruptures.
この種の温度検知器における検知素子においては、プラ
スチックチューブの軟化溶融に至るまでの温度上昇に時
間を要するため、周囲温度が火災状態として検知すべき
温度に達してから数百秒も後になってから内圧低下が起
きて作動に遅れが生じ、検知器として応動の遅れが問題
となっている。In the detection element of this type of temperature detector, it takes time for the temperature to rise to the point where the plastic tube softens and melts, so it may take several hundred seconds after the ambient temperature reaches the temperature that should be detected as a fire condition. This causes a drop in internal pressure, causing a delay in activation, and the delay in response has become a problem for the detector.
上記の遅れ時間を短かくするには、検知素子であるプラ
スチックチューブの肉厚を薄くすればよいが、このプラ
スチックチューブは常時内圧を受けているので周方向の
応力すなわちフープストレスが常に作用した状態で数年
以上の長期間にわたって安定した火災監視を行なわなけ
ればならず、このようなフープストレスに長期間耐える
ためにプラスチックチューブのクリープ破断特性で定め
られる一定以上の肉厚が不可欠である。In order to shorten the above delay time, it is possible to reduce the thickness of the plastic tube that is the sensing element, but since this plastic tube is constantly under internal pressure, it is in a state where stress in the circumferential direction, that is, hoop stress, is constantly applied. In order to withstand such hoop stress over a long period of time, stable fire monitoring must be performed over a long period of several years or more, and in order to withstand such hoop stress for a long period of time, it is essential that the plastic tube has a wall thickness that exceeds a certain level determined by its creep rupture characteristics.
このため従来のこの種検知素給ではこの肉厚が厚いため
に検知素子自体がスプリングバックして検知素子敷設時
の曲げ加工がしにくく、曲げ形状を保持するために特別
な抑え具が必要であった。For this reason, in conventional sensing elements of this type, the thick wall causes the sensing element itself to spring back, making it difficult to bend when installing the sensing element, and special holding tools are required to maintain the bent shape. there were.
一般に円筒チューブに作用するフープストレスσは、チ
ューブ外径をD(cm)、内圧をP(kg/−〕、チュ
ーブの肉厚をd(crrL’lとするとき次式%式%
すなわちチューブの肉厚dが薄くなるに従いフープスト
レスが高くなり、フープストレスが高くなると第1図に
示すように同じ内圧値で平常監視状態を続けたときのチ
ューブが破壊されるまでの時間すなわち寿命が短くなる
。In general, the hoop stress σ that acts on a cylindrical tube is expressed by the following formula, %, where the tube outer diameter is D (cm), the internal pressure is P (kg/-), and the tube wall thickness is d (crrL'l). As the wall thickness d decreases, the hoop stress increases, and as shown in Figure 1, as shown in Figure 1, the time it takes for the tube to break under normal monitoring conditions at the same internal pressure value, that is, the life span, shortens. .
第1図は低密度ポリエチレンチューブのクリープ破壊曲
線の一例を示すものであり、フープストレスの増加が寿
命の短縮を招くことを示している。FIG. 1 shows an example of a creep rupture curve of a low-density polyethylene tube, and shows that an increase in hoop stress leads to a shortened life.
またチューブの肉厚をあまり薄くすると取扱い時の機械
的強度が低下するので敷設作業が困難となり、この面か
らも成る程度の肉厚が要求される。Furthermore, if the wall thickness of the tube is too thin, the mechanical strength during handling will be reduced, making installation work difficult, and the wall thickness must be adequate in this respect as well.
この考案は前述の問題点に鑑みてなされたもので、第2
図に略図を示した如く、気体または液体により内圧を加
えられた長尺の可撓性検知素子Aが圧力保持装置Bと圧
力検出装置Cとからなる検知器本体りに接続され、該検
知素子の局所的な熱破裂による圧力低下を検知すること
により、当該異常個所の周囲温度を検知する温度検知器
において、前記可撓性検知素子として所定温度に加熱さ
れたとき軟化する感温チューブの長さ方向に、連続して
薄肉金属テープを、該金属テープにより感温チューブの
長さ方向に連続したスリットが形成されるように複合さ
せた複合チューブを用いたことを特徴とする温度検出器
であり、フープストレスに耐え得る肉薄の検知素子を構
成する感温チューブに対して表面の受熱効率を増加する
ために熱伝導性の良い金属テープを沿わせて密着し、こ
の金属テープの剛性によって検知素子としてのスプリン
グバックを抑止して可撓性を持たせた改良された検知素
子を具備した温度検知器を提供するものである。This idea was made in view of the problems mentioned above, and the second
As schematically shown in the figure, a long flexible sensing element A to which internal pressure is applied by gas or liquid is connected to a detector body consisting of a pressure holding device B and a pressure sensing device C, and the sensing element In a temperature sensor that detects the ambient temperature of an abnormal location by detecting a pressure drop due to local thermal rupture of A temperature sensor characterized by using a composite tube in which a thin-walled metal tape is continuously combined in the length direction of the temperature-sensitive tube so that the metal tape forms continuous slits in the length direction of the temperature-sensitive tube. In order to increase the heat receiving efficiency on the surface, a metal tape with good thermal conductivity is attached closely to the thermosensitive tube that constitutes a thin sensing element that can withstand hoop stress, and the rigidity of this metal tape allows for detection. An object of the present invention is to provide a temperature sensor equipped with an improved sensing element that suppresses springback and has flexibility.
この考案を実施例図面と共に詳述すれば、第3図は本考
案の温度検知器における検知素子の構造説明図で1はポ
リエチレンやポリ塩化ビニルなどの熱可塑性樹脂製の感
温チューブであり、このチューブ1は材質選定によって
所定温度で軟化しさらには溶融する。To explain this invention in detail together with the drawings of the embodiments, Fig. 3 is an explanatory diagram of the structure of the sensing element in the temperature sensor of the invention, and 1 is a temperature-sensitive tube made of thermoplastic resin such as polyethylene or polyvinyl chloride; Depending on the material selected, the tube 1 softens and even melts at a predetermined temperature.
この感温チューブ1の外周には、アルミニウム或いは銅
、洋白などの熱伝導性の良い金属材料からなる薄肉金属
テープ2が密着して被せられ、金属テープ2の両縁間に
感温チューブ表面が露出するスリット3が形成されてい
る。A thin metal tape 2 made of a metal material with good thermal conductivity, such as aluminum, copper, or nickel silver, is tightly placed on the outer periphery of the temperature-sensitive tube 1, and the surface of the temperature-sensitive tube is covered between both edges of the metal tape 2. A slit 3 is formed through which the is exposed.
金属テープ2とスリット3とは共にチューブ1の長さ方
向に連続し、実施例図面ではスリット3が直線状に形成
されているがチューブ1の長さ方向に連続するなら正強
波状、矩形波状、あるいは三角波状に形成しても良い。Both the metal tape 2 and the slit 3 are continuous in the length direction of the tube 1, and in the drawings of the embodiment, the slit 3 is formed in a straight line, but if it is continuous in the length direction of the tube 1, it has a positive strong wave shape or a rectangular wave shape. , or may be formed in a triangular wave shape.
また金属テープ2はチューブ1内に設けても良い。Further, the metal tape 2 may be provided inside the tube 1.
このような構成をもつこの考案の温度検知器における検
知素子は感温チューブ1内にN2ガスなどの流体を封入
して内圧を与えた状態で使用され、例えば部屋の天井の
隅などに敷設されて火災監視を行なう。The sensing element in the temperature sensor of this invention having such a configuration is used with a fluid such as N2 gas sealed in the temperature sensing tube 1 to apply internal pressure, and it is installed, for example, in a corner of the ceiling of a room. Conduct fire monitoring.
この場合、火災による周囲温度の上昇は金属テープ2に
よって効率良く受熱され、感温チューブ1はこの金属テ
ープ2から熱伝導を受けて軟化する。In this case, the rise in ambient temperature caused by the fire is efficiently received by the metal tape 2, and the temperature-sensitive tube 1 is softened by heat conduction from the metal tape 2.
スリット3部分では内圧によって感温チューブが膨張し
、遂にはスリット3部分にて溶融破裂する。The thermosensitive tube expands due to internal pressure at the slit 3 portion, and finally melts and bursts at the slit 3 portion.
この場合の内圧の急激な低下は圧力検知装置によって検
知され火災発報が行なわれる。In this case, a sudden drop in internal pressure is detected by a pressure detection device and a fire alarm is issued.
この考案の温度検知器によれば、検知素子は、金属テー
プの添着によって輻射熱および対流熱を効果的に捕捉し
、これを感温チューブに伝えるので感温チューブの肉厚
に反して作動時間の遅れを短縮でき、また感温チューブ
のスプリングバックも金属テープの剛性によって抑えら
れるから曲げぐせがつけやすく、敷設時の曲げ加工が容
易でその曲げ形状を保持するための別の抑え具も必要で
ないなど、数多くの実用的効果が得られるものである。According to the temperature sensor of this invention, the sensing element effectively captures radiant heat and convective heat by attaching the metal tape and transmits it to the temperature-sensitive tube, so the operating time is shortened despite the wall thickness of the temperature-sensitive tube. Delays can be shortened, and the springback of the temperature-sensitive tube can be suppressed by the rigidity of the metal tape, making it easy to create bends, making it easy to bend during installation, and eliminating the need for separate restraints to maintain the bent shape. Many practical effects can be obtained.
第1図は低密度ポリエチレンチューブのクリープ破壊特
性の一例を示す線図、第2図は本考案温度検知器の機能
的概略図、第3図はこの考案の一実施例を示す部分斜視
図である。
1・・・感温チューブ、2・・・金属テープ、3・・・
スリ゛ン ト。Fig. 1 is a diagram showing an example of the creep rupture characteristics of a low-density polyethylene tube, Fig. 2 is a functional schematic diagram of the temperature sensor of the present invention, and Fig. 3 is a partial perspective view showing an embodiment of the invention. be. 1...Thermosensitive tube, 2...Metal tape, 3...
Slint.
Claims (1)
知素子が圧力保持装置と圧力検出装置とからなる検知器
本体に接続され、該検知素子の局所的な熱破裂による圧
力低下を検知することにより当該異常個所の周囲温度を
検知する温度検知器において、前記可撓性検知素子とし
て所定温度に加熱されたときに軟化する感温チューブの
長さ方向に連続して薄肉金属テープを該金属テープによ
り感温チューブの長さ方向に連続したスリットが形成さ
れるように複合させた複合チューブを用いたことを特徴
とする温度検知器。A long flexible sensing element to which internal pressure is applied by gas or liquid is connected to a detector body consisting of a pressure holding device and a pressure sensing device, and detects a pressure drop due to local thermal rupture of the sensing element. In a temperature sensor that detects the ambient temperature of the abnormal location by using the flexible sensing element, a thin metal tape is continuously connected in the length direction of the temperature-sensitive tube that softens when heated to a predetermined temperature. A temperature sensor characterized by using a composite tube made of tape so that continuous slits are formed in the length direction of the temperature-sensitive tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10182477U JPS5836049Y2 (en) | 1977-08-01 | 1977-08-01 | temperature detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10182477U JPS5836049Y2 (en) | 1977-08-01 | 1977-08-01 | temperature detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5429687U JPS5429687U (en) | 1979-02-27 |
JPS5836049Y2 true JPS5836049Y2 (en) | 1983-08-13 |
Family
ID=29040815
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10182477U Expired JPS5836049Y2 (en) | 1977-08-01 | 1977-08-01 | temperature detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5836049Y2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2868351A1 (en) | 2013-10-30 | 2015-05-06 | Fogmaker International AB | Fire extinguishing system |
-
1977
- 1977-08-01 JP JP10182477U patent/JPS5836049Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5429687U (en) | 1979-02-27 |
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