Line-type heat detector based on thermoelectric couple principle

The principle of a thermocouple and the technology of fire detectors are applied in the direction of electric fire alarms, thermometers and instruments using electric/magnetic components directly sensitive to heat, etc., which can solve the problem of inability to monitor the open circuit of linear temperature-sensing fire detectors. Or open circuit fault, unreliable alarm, smaller and other problems

Active Publication Date: 2009-08-26
SURELAND IND FIRE SAFETY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional thermocouple principle linear temperature-sensitive fire detector has the following problems: the described conversion box 2 cannot monitor the open circuit or open circuit fault of the linear temperature-sensitive fire detector
The method of adding terminal resistor 6 at the end of the above-mentioned online temperature sensing element 1 will make the voltage measurement

Method used

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  • Line-type heat detector based on thermoelectric couple principle
  • Line-type heat detector based on thermoelectric couple principle
  • Line-type heat detector based on thermoelectric couple principle

Examples

Experimental program
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Example Embodiment

[0017] Example 1:

[0018] like figure 2 As shown, the thermocouple-based linear temperature-sensing fire detector provided in this embodiment includes a linear temperature sensing element 1; one end connected to the linear temperature sensing element 1 has a voltage monitoring unit 7 inside, so that the entire circuit can be detected in real time The voltage value can be processed at the same time, and the conversion box 12 that outputs the alarm signal when the alarm parameter of the entire loop exceeds the alarm threshold; and the terminal resistance 6 that is connected to the other end of the online temperature sensing element 1 and acts as a circuit breaker; Wherein the linear temperature sensing element 1 includes two detection conductors 3, 4 and an NTC characteristic barrier layer 5 arranged in parallel between the two detection conductors 3, 4, and at least one of the two detection conductors 3, 4 is a thermocouple wire; the resistance value Rz of the terminal resis...

Example Embodiment

[0024] Example 2:

[0025] This embodiment is an improvement on the basis of Embodiment 1, as image 3 As shown, the thermocouple-based linear temperature-sensitive fire detector provided in this embodiment is to add a resistance monitoring unit 8 that can work alternately with the voltage monitoring unit 7 in the conversion box 12 in the first embodiment, and the rest is the same.

[0026] This is because when the resistance measuring unit 8 is not installed in the switch box 12 of the detector, the switch box 12 performs fault judgment based on the abrupt change of the measured voltage caused by the disconnection. When an open circuit fault occurs at the end of the terminal resistor 6, the voltage value monitored by the conversion box 12 will change abruptly, so it is feasible to judge the fault simply based on monitoring the above voltage value. However, when the disconnection occurs at a certain part of the line-type temperature sensing element 1 between the terminal resi...

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Abstract

A line-type heat sensing fire detector based on thermoelectric couple principle comprises a line-type temperature sensor element, a converter box and a terminal capacitor; wherein the line-type temperature sensor element comprises two detecting conductors and an NTC property barrier layer parallelly arranged between the two detecting conductors and at least one of the two detecting conductors is a thermoelectric coupling wire; and the resistance value Rz of the terminal resistance is larger than the critical resistance value Rlj. The line-type heat sensing fire detector with terminal capacitor provided by the invention can ensure the detector alarms normally and reliably by using the method of leading the resistance value of the terminal resistance to be larger than the critical resistance value, and a resistance measurement unit which can monitor the line-type temperature sensor element alternatively with a voltage monitor unit, thus resolving the detect caused by alarming the accidents according to the voltage measurement value alone.

Description

technical field [0001] The invention belongs to the field of fire protection, in particular to a thermocouple-based linear temperature-sensing fire detector. Background technique [0002] The traditional thermocouple principle The linear temperature-sensitive fire detector is one of the commonly used linear temperature-sensitive fire detectors in the field of fire protection. figure 1 It is a structural schematic diagram of a traditional thermocouple-based linear temperature-sensing fire detector. like figure 1 As shown, this type of thermocouple wire-type temperature-sensing fire detector mainly includes a wire-type temperature sensing element 1 and one end connected to the wire-type temperature sensing element 1, and a voltage monitoring unit 7 is arranged inside, so that the voltage value of the entire circuit can be detected in real time , can carry out data processing at the same time, and output the conversion box 2 of alarm signal when the alarm parameter of the who...

Claims

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Application Information

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IPC IPC(8): G08B17/06G01K7/02G01K7/026
Inventor 张卫社李刚进
Owner SURELAND IND FIRE SAFETY
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