Underground pipe gallery cable joint overheating alarm device and its automatic fire extinguishing device and system

By using SMA spring-driven alarm and fire extinguishing devices at underground utility tunnel cable joints, the problems of temperature monitoring blind spots and low fire extinguishing efficiency have been solved, achieving efficient and reliable temperature monitoring and fire protection for cable joints.

CN122200923APending Publication Date: 2026-06-12HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Filing Date
2026-03-30
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

In existing technologies, temperature monitoring of underground utility tunnel cable joints has blind spots, and the monitoring devices are susceptible to failure due to high temperature, high humidity and strong electromagnetic interference. Fire extinguishing methods are difficult to penetrate into the joint, posing a risk of reignition.

Method used

Using shape memory alloy (SMA) springs as the core temperature sensing and driving element, mechanical driving force is generated through temperature-induced phase change to achieve direct monitoring of the internal temperature of the cable joint. Under the graded response mechanism, alarms and automatic fire extinguishing are triggered, avoiding dependence on external power supply.

Benefits of technology

It enables accurate monitoring of the internal temperature of cable joints and efficient fire suppression, improving the accuracy of monitoring and environmental adaptability, avoiding the problems of failure and low fire suppression efficiency of traditional monitoring devices, and providing a dual protection mechanism.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of power system safety protection and fire fighting, in particular to an underground pipe gallery cable joint overheating warning device, and an automatic fire extinguishing device and system thereof. The underground pipe gallery cable joint overheating warning device comprises a shell, a heat-sensitive driving mechanism and a warning module. The shell is used for passing the cable and the cable joint is located in the shell. The heat-sensitive driving mechanism senses the temperature change of the cable joint through an SMA spring to produce deformation to drive the slider to slide relative to the support rod. The warning module uses the SMA spring as the core temperature sensing driving element, uses the temperature-induced phase change characteristics to generate mechanical driving force, triggers the indicator to pop up to the ground for warning. Therefore, the present application performs overheating warning for the internal part of the cable joint, does not need to rely on external power supply, and can resist harsh environment, thereby solving the problems of monitoring blind area of the cable joint caused by difficulty in monitoring the core temperature of the cable joint, and external power supply of the electronic monitoring device.
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