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Irrecoverable type cable type line type fixed temperature fire detector

A fire detector and line-type technology, applied in the field of fire detectors, can solve the problems of inability to distinguish short circuit, open circuit, and power failure signals, etc., and achieve the effects of strong anti-electromagnetic interference, simple structure, and avoiding false alarms

Active Publication Date: 2008-03-26
SHENYANG P T SECURITY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this kind of detector is: when the temperature of any point on the detector reaches the set alarm temperature, the detector can short-circuit the alarm, and the alarm sensitivity of the detector has nothing to do with the heating length. When a short circuit is caused by accidents such as rat bites, the detector will also output an alarm signal, which cannot distinguish short circuit, open circuit, and power failure signals

Method used

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  • Irrecoverable type cable type line type fixed temperature fire detector
  • Irrecoverable type cable type line type fixed temperature fire detector

Examples

Experimental program
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Embodiment 2

[0010] Embodiment 2, a non-recoverable cable-type constant temperature fire detector, see Figure 3: It is characterized in that the temperature-sensing cable structure can also be covered with an insulating material layer 2 by two elastic metal conductors 1, one of which One or two cores are then coated with a conductive layer 3, two cores with different or the same coating layers are twisted or twisted together, and then coated with a shielding layer 6, and finally the outer sheath layer 4 is extruded to make a temperature-sensitive cable .

Embodiment 3

[0011] Embodiment 3, a non-recoverable cable-type constant temperature fire detector, see Figure 4: It is characterized in that the temperature-sensing cable structure can also be rewound or axially placed in the outer sheath layer 4 or shielding layer 6 One or more shielded wires 7 .

[0012] The temperature-sensing cable structure of a non-recoverable cable-type constant-temperature fire detector in the above-mentioned embodiments 1 to 3 can also be coated with an insulating tape layer 8 inside the outer sheath layer 4 .

[0013] The above-mentioned embodiments 1 to 3 are non-recoverable cable-type constant-temperature fire detectors, and the wire core with the covering layer can be one core or more than one core.

[0014] The above-mentioned embodiments 1 to 3 are a non-recoverable cable type constant temperature fire detector, wherein the conductive layer 3 or the shielding layer 6 or the shielding wire 7 can be connected to any one of the two elastic metal conductors 1 r...

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PUM

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Abstract

A non-restored cable-type fixed-temperature fire detector is disclosed. Two ends of a heat-sensing cable are respectively connected with a resistance signal processor and a terminal resistor to form a closed-circuit signal collection circuit. It is characterized in that the structure of the heat-sensing cable is two elastic metal conductors respectively coated with an insulation material layer, in which one is again coated with a shield layer. The two conductor wires with different coatings are twisted or wound together and an external jacket is extruded on to produce the heat-sensing cable. In the external jacket one or more shield leads can be wound or axially placed. The resistance-signal processor judges the detected resistance value or voltage change signal and sends alarming signals, and according to the resistance change of conductors the resistance-signal processor judges and sends short circuit and break circuit fault signals and powered-off fault signal of the resistance signal processor.

Description

technical field [0001] The invention relates to a fire detector in the field of fire protection, and can provide a non-recoverable cable-type constant temperature fire detector, which has the functions of constant temperature alarm and short circuit, open circuit, and power failure report failure output functions. Background technique [0002] The linear temperature-sensitive fire detector in the prior art is a kind of fire detector with a very wide range of uses. In the switch value linear temperature-sensitive detector currently used, the two elastic conductors 10 in the sheath 12 are respectively covered with The layers of plastic insulating material 11 are twisted together. When the temperature of the cable of the detector rises to the melting point of the plastic layer and then softens or melts, the elastic conductors are under the action of the elastic force, and the two elastic conductors are short-circuited to send out an alarm signal. The advantage of this kind of ...

Claims

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Application Information

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IPC IPC(8): G08B17/06G08B29/00G01K11/06
Inventor 张陈王文江
Owner SHENYANG P T SECURITY TECH