Resin Welding Joint Radial Expansion Gap Holder
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Solution Overview
Problem
Conventional welding joints for synthetic resin-made tubes experience inward expansion and bead formation during heat welding, leading to fluid passage narrowing and instability, and require maintenance-intensive insulation materials, while non-linear shapes face durability issues under acceleration tests.
Innovation Solution
A synthetic resin-made welding joint with a pipe end portion and a holder featuring a radial expansion gap, where the holder's flange ensures uniform heating and prevents inward expansion, and a welding apparatus with half-split heaters that maintain uniform heating without insulation materials, allowing for stable welding of non-linear shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heating means externally surrounds the pipe end portion to weld the joint, then welding efficiency is improved, but the joined portion expands inward and narrows the fluid passage
Solution Approach 1:
The heating means is divided into a heating portion and a holder portion, with the heating portion separated from the holder by a gap. This segmentation allows the heating portion to efficiently heat the pipe end portion while the holder portion prevents inward expansion, resolving the contradiction between welding efficiency and passage narrowing.
Solution Approach 2:
The holder acts as an intermediary component between the heating means and the pipe end portion. It provides mechanical support and constraints to prevent inward expansion during heating, while allowing the heating portion to perform its function without causing harmful expansion effects.
2Manufacturing precision
If insulation materials are used in the heating portion, then heating uniformity is improved, but maintenance requirements increase
Solution Approach 1:
The design extracts and eliminates the insulation material from the heating portion structure. By removing this maintenance-intensive component, the system achieves comparable heating uniformity through the gap design while significantly reducing maintenance requirements.
Solution Approach 2:
The gap between the heating portion and holder serves a dual function: it provides thermal insulation equivalent to traditional insulation materials while also facilitating easy removal and cleaning of the heating portion, making the system self-maintaining without requiring separate insulation components.
3Volume of moving object
If the pipe end portion is compactified, then device size is reduced, but durability under acceleration tests deteriorates
Solution Approach 1:
The design compensates for the reduced size in one dimension (compactified pipe end portion) by adding structural elements in another dimension (protrusion and recess groove features). This dimensional transition maintains durability under acceleration tests while achieving compactification of the overall device size.
Solution Approach 2:
The protrusion and recess groove create localized structural features at critical areas of the pipe end portion. These local quality enhancements provide reinforcement and stress distribution that maintain durability under acceleration tests despite the overall compactified design.
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 prevents inward expansion and bead formation, ensuring uniform fluid passage and stable welding without insulation, while enabling compactification of the pipe end portion and maintaining durability in non-linear shapes.
Implementation Method 1
heating of heating means which externally surrounds the pipe end portion
Implementation Method 2
the welded portion expands, and hence the joining portion wholly expands toward the radially inner side
Data Source
AI summary
A synthetic resin-made welding joint that has a pipe end portion into which an end portion of a synthetic resin-made tube is to be fitted and inserted, and that is configured so that the pipe end portion and the tube end portion which is fitted and inserted thereinto are enabled to be welded together by heating of heating means which externally surrounds the pipe end portion, therefore, a synthetic resin-made holder which is fitted and attached onto the pipe end portion is disposed, and a flange for ensuring a radial expansion gap with respect to the heating means is integrally formed in the holder.