A restorable multistage alarming line style heat detector based on bimetal temperature switch

A technology of temperature sensing detector and temperature switch, which is applied to electric fire alarms, thermometers, thermometers using electric/magnetic components directly sensitive to heat, etc. Problems such as short heating length

Inactive Publication Date: 2008-07-09
张陈
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this detection cable is that the alarm temperature is related to the length of heating and the length of use. If the heating length is long, the alarm temperature will be low, and if the heating length is short, the alarm temperature will be high.
This is detrimental to the reliability of the detector and prone to false alarms

Method used

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  • A restorable multistage alarming line style heat detector based on bimetal temperature switch

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Experimental program
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Embodiment 2

[0011] Embodiment 2 is shown in Fig. 3, a kind of recoverable multi-stage alarm line type temperature sensing detector based on bimetallic temperature switch is connected with microcomputer modulator 4 and terminal resistor R at both ends of the temperature sensing cable respectively to form a closed circuit signal acquisition circuit, its The characteristic lies in the structure of the temperature-sensing cable: the temperature-sensing element of multiple bimetallic temperature switches 2 connected in series with R1 is used in parallel between two conductors 1, and R1 is a thermistor or thermocouple with NTC, CTR, and PTC characteristics.

[0012] The bimetallic temperature switch 2 of the above-mentioned embodiment 1-embodiment 2 can also be a thermal expansion type mercury electric contact temperature switch or a thermal reed temperature switch or a memory alloy temperature switch.

[0013] After the above-mentioned embodiment 1-embodiment 2 are assembled, the two conductors...

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PUM

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Abstract

The invention provides a bimetal temperature switch-based restorable multi-stage alarming linear temperature sensor, can implement multi-stage alarm by parallelly connecting bimetal temperature switches with same or different temperature grades which are subjected to short circuit due to heat and output signals with different resistances, and has function for judging failures including output short circuit, open circuit and power-off and alarming. The temperature sensor can be repeatedly used. The inventive temperature sensor comprises a temperature sensing cable, a microcomputer modulator, and a terminal resistor R, and is characterized in that the temperature sensing cable includes multiple bimetal temperature switches parallelly connected between two parallel conductors; thermistors or thermocouples with characteristics of NTC, CTR and PTC are serially connected in the bimetal temperature switches; or thermistors or thermocouples R1 with characteristics of NTC, CTR and PTC are serially connected outside the bimetal temperature switches; and action temperature of the bimetal temperature switch is of 60-180DEG C.

Description

technical field [0001] The invention relates to a fire alarm device, which is a recoverable multi-level alarm line type temperature-sensitive detector based on a bimetallic temperature switch. Background technique [0002] Discrete thermistor parallel connection type analog quantity line type temperature-sensitive fire detection cable in the prior art, see Fig. 1, in this detection cable, multiple thermistors are connected in parallel between two detection conductors 14 and 15 Component R consists of. When a section of the detection cable is heated, as the temperature rises, the resistance value of the thermistor in this section decreases (or increases), causing the total resistance between the detector conductors to decrease (or increase). Resistance change alarm. The disadvantage of the detection cable is that the alarm temperature is related to the heated length and the used length, the longer the heated length, the lower the alarm temperature, and the shorter the heate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/06G01K7/00
Inventor 张陈王文江
Owner 张陈
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