Electrofusion Collar Axial Stability Segmented Design
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Solution Overview
Problem
Existing electrofusion collar assemblies tend to move axially during shipping and installation, leading to inadequate fusion and potential leakage in pipe joints due to lack of axial stability while allowing rotational motion.
Innovation Solution
An electrofusion collar design featuring an inner wall with a heating element, a radially segmented outer wall, and a linking portion, along with axial registration means such as radially inward projections, and a band clamp that encircles the outer wall to prevent axial movement while allowing rotation, ensuring secure engagement with the fitting body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrofusion collar is designed without axial retention means, then the collar can be easily installed and rotated during installation, but the collar moves axially during shipping and installation, causing partial insertion and inadequate fusion
Solution Approach 1:
The collar includes axial registration means (projections on the inner surface of the outer wall) that are pre-configured to engage with the fitting body, establishing axial position before final insertion. This preliminary axial registration prevents movement during shipping while allowing rotational adjustment during installation.
Solution Approach 2:
The outer wall is segmented into multiple sections that can rotate relative to each other, allowing the collar to rotate around the fitting body during installation. The segmentation enables rotational freedom while the axial registration means maintain proper axial positioning.
2Reliability
If the collar is retained axially with strong engagement features, then axial stability is achieved, but rotational motion is restricted
Solution Approach 1:
The outer wall is divided into multiple segmented sections that can rotate independently relative to each other. This segmentation provides rotational flexibility for orientation adjustment while the axial registration means maintain stable axial positioning against the fitting body.
Solution Approach 2:
The collar design allows dynamic rotation during installation through the segmented outer wall structure, then transitions to a stable fixed axial position once installed. The axial registration means enable the collar to move from an adjustable rotational state to a stable installed state.
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 effectively prevents axial movement of the collar during installation, ensuring reliable fusion and preventing leakage by maintaining axial stability while allowing necessary rotational flexibility for easy orientation and attachment.
Implementation Method 1
The heating element may be energized by an electric power source to heat the fitting and the pipe sufficiently to weld the two together
Implementation Method 2
heat the fitting and the pipe sufficiently to weld the two together
Data Source
AI summary
An electrofusion fiting (20) comprises a fitting body (24) and an electrofusion collar (26). The fitting body (24) has an exterior surface (30), an interior surface (32), and a terminal portion (44) extending to a rim (34). The collar (26) has: an inner wall (42) having a heating element (60); a segmented outer wall (40) spaced radially apart from the inner wall; and a linking portion (46) linking the outer wall and inner wall. The fitting body terminal portion is between the inner wall and the outer wall. The collar and fitting body have interfitting features (150, 152) axially retaining the collar against extraction from the fitting body while permitting relative rotation of the collar and the fitting body.