Preparation method of electric melting sealing pipe and electric melting sealing pipe

By employing a multi-layered composite structure and precise resistance wire winding, the sealing problem of electrofusion fittings under high pressure, alternating loads, and vibration conditions has been solved, achieving high reliability and uniform melting of the electrofusion joint, and enhancing its resistance to pull-out and vibration.

CN122323451AInactive Publication Date: 2026-07-03JIANGSU LANGBO PIPELINE MFG CO LTD
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Patent Information

Application Number
CN202610799519.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-04
Publication Date
2026-07-03
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing electrofusion fittings have poor sealing performance under high pressure, alternating load and vibration conditions, and are prone to micro-cracks and sealing failure. The position deviation of the resistance wire leads to uneven melting zone and is prone to wear in vibration environment.

Method used

The structure adopts a multi-layer composite structure. The inner tube blank is equipped with axial and circumferential reinforcing ribs. The resistance wire is wound across the nodes. The inner positioning layer fixes the resistance wire. The annular sealing groove is embedded with an annular sealing ring and wrapped with continuous reinforcing fibers. The outer layer covers the gaps between the fiber bundles. The structure is formed by injection molding layer by layer using fluoropolymers with different melting points.

Benefits of technology

It improves the sealing reliability and consistency of electrofusion joints, enabling them to maintain sealing performance for a long time under high pressure, alternating and vibration conditions, significantly enhances pull-out resistance, and prevents leakage.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a preparation method of an electric melting sealing pipe and the electric melting sealing pipe, and belongs to the technical field of pipeline connection. The preparation method comprises the steps that an inner-layer pipe blank with axial and circumferential reinforcing ribs on the outer wall is prepared, and the reinforcing ribs intersect to form joints; a resistance wire is wound on the outer wall face of the inner-layer pipe blank and crosses nodes, and tension and a fitting gap are controlled through a tension sensor and a laser displacement sensor; injecting a second fluoropolymer with a lower melting point to form an inner positioning layer to fix the resistance wire; turning an annular sealing groove in the outer wall of the inner positioning layer, and embedding an elastic sealing ring of which the section diameter is greater than the groove depth; continuous reinforced fibers are wound outside the sealing ring to form an annular winding layer, and radial pre-pressure is applied to the sealing ring; injecting a third fluoropolymer with a lower melting point to form an outer layer and filling gaps of the fiber bundles; and cooling and inspecting. Through the synergistic effect of accurate positioning of the resistance wire, pre-pressing of the elastic sealing ring and the fiber reinforced layer, long-term reliable sealing is achieved under the working conditions of high-pressure alternating and vibration, and the axial pull-off resistance is greatly improved.
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