Recently, inflatable cable conduit sealing devices have achieved technological breakthroughs in the field of power infrastructure, with significantly improved waterproof, fire resistance, and construction efficiency, becoming a key equipment for ensuring the safety of urban power grids.
1、 Core technology breakthrough
Integrated waterproof and fireproof design
The inflatable composite high-voltage cable equipment developed by State Grid Hunan Electric Power Research Institute in collaboration with multiple units injects mixed gas into the cable buffer layer to create an internal and external pressure difference, achieving waterproof sealing in a water depth of 10 meters. At the same time, the flame retardant ability is 60% higher than traditional materials. The patent for "Gas Pipeline Maintenance and Sealing Device" approved by Shandong Yitong Company solves the problems of low efficiency and unstable sealing effect in traditional sealing operations through the sliding rod linkage structure and flexible sealing ring design.
Innovation in Materials and Processes
Hangzhou Hengma Electric Power Technology adopts the sealed air bag made of polymer materials, which has both lightweight and anti-aging characteristics. After inflation, it can rapidly expand to 0.28-0.3kg air pressure, effectively plugging the annular space of the pipeline. The inflatable cable conduit sealing device launched by Boqixiang Electric supports pipes made of different materials such as PVC and steel pipes, and its installation range covers complex scenarios such as air ducts and multi-core cables.
2、 Application scenario expansion
Urban power grid upgrade
The 110 kV Red Ring Line in Changsha has been renovated with inflatable composite cables to achieve independent waterproofing function, reducing the daily pumping and repair work of 30 people. The renovation cost is only 8% of the original line. Cities such as Beijing and Shanghai have planned to promote this technology.
Rail Transit and Emergency Repair
The sealing device of Hangzhou Hengma is applied to the sealing of subway cable trenches, reducing the risk of fire through flexible sealing and solving the safety hazards of enclosed underground spaces. The inflatable occluder developed by a certain enterprise in Zhuzhou can complete pipeline repair within 10 minutes, support repeated disassembly and assembly, and significantly shorten power outage time.
3、 Market promotion and cost advantages
Accelerated large-scale application
Hengma Technology, Boqixiang and other companies have reduced the cost of sealing devices to 50% of traditional solutions through intelligent production lines. Their products have covered customers such as State Grid and China Telecom, and have established sales networks in the European Union and Southeast Asian markets.
Improvement of construction efficiency
The Shandong Yitong patented device reduces the sealing operation time by 40% and achieves a sealing consistency of over 98% through the linkage control of driving components. Bo Qixiang's sealing device adopts a modular design, supporting a single person to complete standard pipeline sealing in 30 minutes.
Future prospects
State Grid Hunan plans to deploy 100000 sets of inflatable composite cable equipment in cities such as Yueyang by 2025, while Hengma Technology is developing an intelligent sealing device that integrates pressure sensors, which can achieve remote monitoring and automatic air replenishment. With the acceleration of urban underground pipe gallery construction, inflatable sealing technology is expected to become a standardized solution in fields such as power and communication.
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