Tube Coupling Injection Molding Setback Design
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Solution Overview
Problem
Tubes with couplings in fluororesin materials often experience liquid leakage due to misalignment and surface irregularities at the cut ends, which are not orthogonal and can create gaps when connected.
Innovation Solution
The tube coupling design features a coupling formed on the leading end by injection molding, where the tube's leading end is set back from the coupling, allowing the coupling to cover at least a portion of the tube's end, including a flange and recessions, ensuring a precise connection surface and enhanced bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tube leading end is formed by cutting, then the tube can be manufactured efficiently, but the cut surface has recessions, protrusions, and tilting that cause liquid leakage when couplings are connected
Solution Approach 1:
The invention extracts the problematic tube leading end from the connection interface by having the coupling protrude beyond the tube end. The coupling's leading end becomes the new connection surface, removing the defective cut surface from the connection function while maintaining efficient tube manufacturing through cutting.
2Device complexity
If the coupling leading end is aligned with the tube leading end, then the structure is compact, but gaps form between opposing leading ends causing liquid leakage
Solution Approach 1:
The invention introduces asymmetry in the axial direction by making the coupling's leading end protrude beyond the tube's leading end. This asymmetric configuration ensures that the coupling's leading end forms the connection surface, eliminating gaps and improving connection reliability while maintaining reasonable structural compactness.
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
This design minimizes liquid leakage by creating a precise connection surface and increasing bond strength, even with irregularities like recessions and tilting, and allows for airtight and fluid-tight connections.
Implementation Method 1
a coupling being formed on a leading end portion of a tube by performing injection molding
Data Source
AI summary
The present invention relates to a tube with coupling according to which liquid leakage and the like can be suppressed as much as possible when couplings are connected. A tube with coupling (10) according to the present invention is a tube with coupling (10) obtained by forming a coupling (30) on a leading end portion (22) of a tube (20) through injection molding, and the leading end portion (22) of the tube (20) is arranged at a position set back from a leading end portion (32) of the coupling (30), at least a portion of the leading end portion (22) of the tube (20) being covered by the coupling (30). It is desirable that a flange (36) is provided so as to protrude outward at a position set back from the leading end portion (32) of the coupling (30) and the leading end portion (22) of the tube (20) is arranged at a position set further back from the flange (36).