Resin Pipe Joint Flow Path Structure for Stable Welded Flow
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Solution Overview
Problem
Conventional resin pipe joints with tapered internal flow paths cause fluctuations in fluid flow rates and inner diameter differences at welded portions, leading to poor fluid flow and increased bead sizes due to uneven cross-sectional areas.
Innovation Solution
A resin pipe joint design with a constant cross-sectional area in portions adjacent to welding end portions, achieved through injection molding using straight outer diameters and specific core pin arrangements, ensuring consistent flow path dimensions before and after welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the internal flow path is designed with a tapered shape to increase cross-sectional area toward welding end portions, then core pin pull-out property is improved, but fluid flow rate fluctuates and smooth flowing is adversely affected
Solution Approach 1:
The internal flow path is segmented into two distinct regions: a tapered section for core pin extraction and a constant cross-sectional area section adjacent to welding end portions. This segmentation allows each region to fulfill its specific function without interfering with the other, resolving the contradiction between manufacturability and fluid flow stability.
Solution Approach 2:
Different cross-sectional area profiles are applied to different locations within the internal flow path. The tapered section provides gradual area increase for easy core pin removal, while the constant area section near welding ends maintains stable fluid flow. This local differentiation of geometric properties resolves the contradiction.
2Ease of manufacture
If the internal flow path has a tapered shape, then core pin extraction is facilitated, but inner diameter differences occur at welded portions causing step formation and large inner beads
Solution Approach 1:
The flow path geometry is divided into functional zones: a tapered zone for core pin extraction and a constant diameter zone at welding end portions. This ensures that the welding surfaces have consistent inner diameters matching the pipe outer diameters, preventing step formation and large inner beads while still allowing easy core pin removal.
Solution Approach 2:
The constant cross-sectional area section is specifically positioned adjacent to the welding end portions to ensure precise inner diameter matching at the welding interface. This local geometric control maintains manufacturing precision at critical welding areas while preserving ease of core pin extraction in the tapered region.
3Ease of manufacture
If the cross-sectional area changes from welding end portions toward the inside, then core pin pull-out is improved, but fluid flow rate changes and smooth flowing is adversely affected
Solution Approach 1:
The internal flow path is divided into a tapered section (for core pin pull-out) and a constant area section (adjacent to welding ends). This segmentation creates a clear functional separation where the constant area region ensures smooth fluid flowing while the tapered region facilitates manufacturing.
Solution Approach 2:
The constant cross-sectional area property is locally applied to the section adjacent to welding end portions to ensure smooth fluid flow, while the tapered property is applied to other sections for ease of core pin extraction. This localized application of different geometric qualities resolves the contradiction.
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 suppresses fluid flow rate fluctuations and prevents inner diameter differences at welded portions, ensuring smooth fluid flow and consistent pipe diameters, thereby preventing step formation and large inner beads.
Implementation Method 1
Both of the end portions of the resin pipe joint and the resin tube member or the like held by the clamp jigs are heated by a heater or other heating device to melt their end portions
Implementation Method 2
the resin pipe joint and the resin tube member or like are brought close to each other to butt their end portions against each other by applying a required pressure and weld them
Data Source
AI summary
A resin pipe joint includes a tubular joint body portion having an internal flow path (P) for allowing a fluid to flow therein; and two or more welding end portions, which are respectively provided at two or more opening portions of the internal flow path (P), and which are configured to be welded while being butted against end portions of other resin tube members or end portions of other resin pipe joints. The flow path cross-sectional area of the internal flow path (P) in the joint body portion is constant, at least in portions that are adjacent to the welding end portions and whose outer diameters are straight.