Tube Fitting Body Stepped Wall Surface Disassembly
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Solution Overview
Problem
Existing tube fittings face challenges in disassembly due to radial reaction forces that resist separation of contacting components during pull-up, leading to difficulties in efficiently disassembling the fittings.
Innovation Solution
The design incorporates recessed, tapered, or stepped surfaces on fitting components to reduce radial reaction forces and enhance axial reaction forces, facilitating the separation of components during disassembly by providing a surface for the displaced portion to contact, thus assisting in the disassembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fitting components are designed with standard contacting surfaces, then the fitting provides sufficient radial containment and structural integrity, but radial reaction forces resist separation of components during disassembly
Solution Approach 1:
The patent applies local quality by creating a recessed portion in the socket wall at a specific location where the tube contacts during disassembly. This localized modification changes the geometric properties only in the critical contact zone, allowing the tube to contact the recessed surface and convert radial reaction forces into axial separation forces, thereby reducing the radial forces that resist disassembly while maintaining structural integrity elsewhere in the fitting.
Solution Approach 2:
The patent inverts the traditional approach by designing the socket with a recessed portion that actively promotes separation rather than resistance. Instead of the socket wall providing continuous radial containment that resists separation, the recessed surface is positioned to contact the tube in a way that generates axial forces facilitating pull-apart, effectively reversing the force direction from resistive to assistive during disassembly.
2Ease of operation
If fitting components are designed with extended contact surfaces, then radial reaction forces are increased for better containment, but disassembly becomes more difficult due to increased resistance
Solution Approach 1:
Rather than modifying the entire socket wall geometry, the patent applies a localized recessed portion only in the specific region where tube contact occurs during disassembly. This minimal geometric modification avoids increasing overall device complexity while effectively addressing the disassembly difficulty by creating a focused separation assistance zone.
3Ease of operation
If fitting components are designed with recessed surfaces to reduce radial reaction forces, then disassembly is facilitated, but manufacturing precision requirements increase
Solution Approach 1:
The recessed portion is localized to a specific axial position and radial depth, concentrating the manufacturing precision requirements to a small, well-defined feature rather than distributing them across the entire socket. This allows for controlled machining of the recessed geometry with standard tolerances, as the critical dimensions are limited to the recessed portion's position, depth, and curvature radius.
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 reduces radial reaction forces and increases axial forces, making it easier to disassemble tube fittings by minimizing interference and promoting the separation of components, thereby simplifying the disassembly process.
Implementation Method 1
By providing a recessed longitudinal surface in the tube socket, the radial force component between the first and second components may be reduced, thereby assisting in separation of the first and second components during disassembly of the fitting assembly
Implementation Method 2
When the fitting assembly is pulled-up, additional engagement between the tube socket and the tube end portion, for example, due to radially outward deflection or bowing of the tube end resulting from axial compression of the tube end, produces axial and radial reaction force components between the tube socket and tube end portion
Implementation Method 3
radially outward deflection or bowing of the tube end resulting from axial compression of the tube end
Data Source
Figure 1~2
Figure 1A~2B
Figure 3~3A
AI summary
A fitting assembly is provided with a first fitting component having a stepped wall surface; and a second fitting component radially spaced from the first fitting component when the fitting assembly is in a finger tight condition prior to pull-up. When the second fitting component is displaced into contact with the stepped wall surface during fitting pull-up, the stepped wall surface assists in separating the first fitting component from the second fitting component upon fitting disassembly.