Insulated Electrofusion Fitting for Pre-Insulated Pipelines
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Solution Overview
Problem
The connection of pre-insulated pipelines requires significant assembly time and effort due to the need for subsequent insulation after welding, often resulting in a non-vaportight connection prone to moisture and vapor condensation.
Innovation Solution
An insulated electrofusion fitting with a plastic outer casing, incorporating a conventional electrofusion sleeve, heating element, and insulation element, where the insulation is prefabricated around the sleeve, forming a vapor-tight connection that eliminates the need for on-site insulation and reduces assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrofusion couplings are used for connecting pre-insulated pipes, then the connection can be made, but significant assembly time is required due to the need for subsequent insulation and protective layer application
Solution Approach 1:
The patent combines the electrofusion coupling, insulating element, and outer protective sheath into a single integrated prefabricated unit. The insulating element is pre-mounted on the coupling, and the outer sheath is encased around the insulation, merging multiple components that would otherwise require separate installation steps into one unified fitting that reduces assembly time and complexity.
Solution Approach 2:
The insulation and outer protective layer are applied to the electrofusion coupling before the actual pipe connection is made. This preliminary preparation eliminates the need for post-installation insulation work, allowing the fitting to be ready for immediate use after the electrofusion welding is complete.
2Reliability
If manual insulation application is performed after pipe connection, then insulation coverage is achieved, but the connection becomes non-vaportight and prone to moisture condensation
Solution Approach 1:
The outer sheath is encased around the insulating element to form an integrated protective envelope. This combined structure creates a continuous vapor-tight barrier that prevents moisture and condensation, eliminating the defects associated with manual insulation application while maintaining ease of installation.
3Productivity
If special electrofusion couplings with pre-integrated insulation are manufactured, then assembly time is reduced, but production costs increase
Solution Approach 1:
The patent integrates the insulating element and outer sheath with the conventional electrofusion coupling in a modular fashion. The insulating element is mounted on the coupling body, and the outer sheath is encased around it, creating a unified structure that reduces on-site assembly time while maintaining manufacturing efficiency through standardized production processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces assembly time and ensures a vapor-tight connection, preventing moisture and condensation, while optimizing production costs by using conventional electrofusion sleeves and materials like PUR rigid foam for insulation.
Implementation Method 1
the electrofusion coupling has at least one heating element, preferably a heating wire winding
Data Source
Figure 1~2
Figure 3~4
AI summary
Insulated electrofusion fitting (1) for connecting end regions of thermoplastic pipelines, in particular pre-insulated pipelines, and its manufacturing method, comprising an electrofusion sleeve (2), wherein the electrofusion sleeve (2) has at least one electrical heating element, wherein the heating element is preferably designed as a heating wire winding (3), at least one contact (4) for supplying the electric current, at least one welding indicator (5), an insulating element (6), wherein the insulating element (6) is arranged on the outer circumference (7) of the electrofusion sleeve (2), wherein the insulated electrofusion fitting (1) has an outer sheath (8) made of plastic.