A waterproof electric thermal insulation joint

Abstract

The invention belongs to the technical field of heat supply and insulation and relates to an insulation joint for a directly-buried high-temperature hot-water pipe network in heat-supply engineering, in particular to a waterproof type electric hot-melting insulation joint. The waterproof type electric hot-melting insulation joint mainly comprises a PE casing, steel tubes, a steel tube weld seam, an electric hot-melting sleeve, charging ports, primary heating cables, secondary heating cables, a seamless thermal shrinkable sleeve, plugs, polyurethane foaming plastic, a foaming cavity, plastic welding, clamping straps, PE lap seams and clampers. The two sealing sleeves, namely the electric hot-melting sleeve and the seamless thermal shrinkable sleeve are arranged at the outer side of a pipeline, so that the sealing and water resisting properties of the insulation joint are enhanced; and by using two times of heating and welding for the electric hot-melting sleeve, in particular the secondary transverse joint heating, the construction quality of projects is further improved, and great significance for improving the construction quality of an insulation pipeline is realized. The waterproof type electric hot-melting insulation joint has the advantages of simple principle, reasonable structure, low preparation cost, mature and safe mounting process, good application environment and wide application range.

Description

Technical field: [0001] The invention belongs to the technical field of heat supply and heat preservation, and relates to a thermal insulation joint for directly buried high-temperature hot water pipe networks in heating engineering, in particular to a waterproof electric thermal insulation joint, which is provided through an electric thermal fusion sleeve and an The seam heat shrinkable sleeve and the two sealing sleeves can ensure the sealing and waterproof performance of the thermal insulation joint, and the construction quality of the project can be further improved through the two times of heating and welding of the electric melting sleeve. Background technique: [0002] Since the introduction of Nordic prefabricated direct-buried thermal insulation pipes in my country in the 1980s, the construction technology of direct-buried heating and thermal insulation pipes in China has developed rapidly. Great progress; with the popularization of high-temperature hot water pipelin...

AI Technical Summary

Problems solved by technology

At present, when direct-buried thermal insulation pipelines are laid in areas with rich groundwater, if any part of the pipeline system is damaged from the outside, causing groundwater to enter the pipeline insulation system, the vaporization of water at high temperature will accelerate the carbonization of the polyurethane insulation layer and make it invalid, and the groundwater will directly When in contact with the steel pipe, more heat will be transferred outward and cause corrosion on the outer surface of the pipe. The high-temperature medium in the pipe will heat more groundwater, form more steam, and extend to both ends more quickly, destroying more The polyurethane insulation layer formed a vicious circle, which will eventually lead to the failure of the insulation of the entire pipeline and the corrosion of the working steel pipe by groundwater, which will bring huge economic losses and safety hazards that cannot be ignored to the heating enterprises.

In the pipeline system, the insulation pipe is generally prefabricated in the factory, and the quality is relatively easy to guarantee; while the joint insulation needs to be made on the construction site, affected by many actual construction conditions, the insulation joint is far less firm than the prefabricated insulation pipe, and becomes a heating pipe. The short board of the system

Images