Linear temperature sensing fire detector with point-shaped temperature sensing element and alarm method thereof

A technology of fire detectors and components, applied to fire alarms with electric effects, thermometers and thermometers with electric/magnetic components that are directly sensitive to heat, can solve the problem of failure to alarm normally, failure to report fire normally, and alarm reliability and sensitivity decline, to eliminate detection blind spots and improve alarm reliability and sensitivity

Inactive Publication Date: 2010-02-17
SURELAND IND FIRE SAFETY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is following problem in above-mentioned linear heat-sensitive fire detector of this prior art: figure 2 , image 3 As shown, one of the power cables A1 laid on the cable tray or the cable tray A2 may have a cable joint B that is prone to problems, and the cable joint B may overlap with a certain part of the linear temperature sensing element 1, It may also not coincide with the linear temperature sensing element 1 at all
In the former case, it is assumed that the normal alarm temperature of the line-type temperature-sensing fire detector is 85°C. If the abnormal high temperature occurs at the cable joint B, due to the limited contact area between the line-type temperature sensing element 1 and the cable joint B, the cable The heat on the joint B cannot be transferred to the linear temperature sensing element 1 quickly, so the conversion box 2 cannot detect the temperature of the linear temperature sensing element 1 or the change of the alarm electrical parameter, so that the linear temperature sensing fire detector is at 85°C The fire alarm cannot be reported normally, and the fire al

Method used

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  • Linear temperature sensing fire detector with point-shaped temperature sensing element and alarm method thereof
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  • Linear temperature sensing fire detector with point-shaped temperature sensing element and alarm method thereof

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Embodiment 1

[0018] Such as Figure 4 As shown, the line-type temperature-sensing fire detector with a point-type temperature sensing element provided in this embodiment includes a line-type temperature sensing element 1, a conversion box 2 connected to both ends of the line-type temperature sensing element 1 and a terminal for circuit breakage monitoring. Resistor 3; wherein the linear temperature sensing element 1 includes two detection conductors arranged in parallel and an NTC characteristic barrier layer arranged in parallel between the two detection conductors; the linear temperature sensing fire detection with a point temperature sensing element The device also includes a point-type temperature sensing element 7 installed at the cable joint B and connected to the conversion box 2 through two conductors 8, and the conversion box 2 real-time temperature or Alarm electrical parameters (or sampled values) are detected.

[0019] In addition, whenever there is a cable joint B, a point-ty...

Embodiment 2

[0024] Such as Figure 4 As shown, the line-type temperature-sensing fire detector provided in this embodiment includes a line-type temperature-sensing element 1, a conversion box 2 respectively connected to both ends of the line-type temperature-sensing element 1, and a terminal for circuit breakage monitoring. Resistance 3; wherein the linear temperature sensing element 1 includes two detection conductors arranged in parallel and an NTC characteristic barrier layer and a meltable insulation layer arranged in parallel between the two detection conductors, and at least one of the two detection conductors is elastic Conductor or memory alloy wire; the line type temperature sensing fire detector with point type temperature sensing element also includes a point type temperature sensing element 7 installed at the cable joint B and connected to the conversion box 2 through two conductors 8 , the conversion box 2 detects the temperature of the linear temperature sensing element 1 an...

Embodiment 3

[0026] In this embodiment, one of the two detection conductors on the linear temperature sensing element 1 in Embodiment 1 and Embodiment 2 is made of thermocouple wire material, and forms a temporary thermocouple with the other, thereby forming a thermocouple The characteristic linear temperature sensing element, while other structures and working principles are the same as the above two embodiments.

[0027] The point-type temperature sensing element 7 is one of a thermistor, a thermocouple or a thermosensitive switch.

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Abstract

The invention relates to a linear temperature sensing fire detector with a point-shaped temperature sensing element and an alarm method thereof. The fire detector comprises a linear temperature sensing element, a converting box, a terminal resistor and a point-shaped temperature sensing element, wherein the point-shaped temperature sensing element is installed at the position of a cable joint andconnected with the converting box by two conductors. The linear temperature sensing fire detector and the alarm method adds the point-shaped temperature sensing element installed at the position of the cable joint on the linear temperature sensing fire detector in the prior art, and the electric parameters of the linear and point-shaped temperature sensing elements are alternately detected by theconverting box; once the cable joint position generates abnormal high temperature, the point-shaped temperature sensing element can transfer a sensing signal to the converting box immediately; accordingly, even if the temperature of the linear temperature sensing element does not reach an alarm threshold value, the converting box can also decide whether a fire alarm signal is transmitted or not according to the condition of the point-shaped temperature sensing element, and a detecting blind area can be eliminated, thereby improving the alarm reliability and the sensitivity of the fire detector.

Description

technical field [0001] The invention relates to a linear temperature-sensitive fire detector and an alarm method, in particular to a linear temperature-sensitive fire detector with a point-type temperature sensing element and an alarm method. Background technique [0002] The linear temperature sensing fire detector is a widely used fire detector, which mainly consists of a linear temperature sensing element with NTC characteristics, connected to one end of the linear temperature sensing element, and can monitor the temperature or temperature of the linear temperature sensing element in real time. Alarm electrical parameters (or sampled values) are detected, and a conversion box that sends out a fire alarm signal according to the temperature or the size of the alarmed electrical parameters (or sampled values) and the other end connected to the linear temperature sensing element activates the linear temperature sensing element. The terminal resistance of the open circuit moni...

Claims

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Application Information

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IPC IPC(8): G08B17/06G01K7/22G01K7/02
Inventor 张卫社李刚进
Owner SURELAND IND FIRE SAFETY
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