Electrofusion Fitting With Elastic Pipe Stop for Slip-On Assembly
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Solution Overview
Problem
Existing electrofusion fittings for plastic pipelines face challenges in efficient and damage-free assembly, particularly when used as slip-on fittings, due to the complexity of removing internal stops and the risk of damaging the inner diameter during installation.
Innovation Solution
An electrofusion fitting with a flexible, elastic pipe stop on the inner surface that tilts to form a stable stop for pipe ends, allowing easy insertion and removal without tools, and features a recess for guiding a heating wire through a single operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed pipe stop is used in the electrofusion fitting, then the insertion depth of pipe ends can be verified, but the stop must be removed for slip-on fitting installation which is time-consuming and damages the inner diameter
Solution Approach 1:
The pipe stop is designed as an elastic element that can dynamically change its state between providing a stable stop function and being easily removable. The elastic property allows the stop to be pressed against the inner surface for stable operation during pipe insertion verification, then easily removed by applying force in the opposite direction for slip-on fitting installation.
Solution Approach 2:
The pipe stop's mechanical properties are changed by using an elastic material that can deform under pressure. This parameter change allows the stop to transition from a rigid obstacle that damages the inner surface to a compliant element that can be easily removed without damage, resolving the contradiction between verification stability and removal ease.
2Stability of the object's composition
If a robust fixed stop is used, then the insertion depth control is stable, but the removal process is complex and time-consuming
Solution Approach 1:
The elastic pipe stop provides stability during normal operation when pressed against the inner surface, then allows rapid removal by reversing the pressing force. This dynamic behavior eliminates the time loss associated with removing robust fixed stops while maintaining stability during pipe insertion verification.
3Ease of operation
If the pipe stop is made elastic, then it can be easily removed without damaging the inner surface, but it must provide stable stop function during operation
Solution Approach 1:
The elastic pipe stop changes its mechanical state based on applied force. During normal operation, the stop is pressed against the inner surface, providing reliable insertion depth verification. When removal is needed, reversing the force causes the elastic element to detach easily without damaging the inner surface, thus maintaining both reliability and ease of operation.
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
Enables reliable assembly of plastic pipelines without additional effort, ensuring a stable weld while minimizing damage to the inner surface and simplifying the installation process.
Implementation Method 1
a heating wire winding (4) inside to weld the pipes to the fitting
Implementation Method 2
The elastic design of the pipe stop allows it to be attached to the inner surface of the body via a slight, unstable connection, enabling easy removal if necessary. Nevertheless, the pipe stop provides a stable stop for the pipe ends.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Electro-welding fitting (1) made of plastic for welding plastic pipes comprising a cylindrical body (2), a longitudinal axis (3), a heating wire winding (4), contacts (5) for supplying the electric current and a pipe stop (6), wherein the pipe stop is arranged on the inner surface (7) of the body, wherein the pipe stop is flexible or elastic.