Angularly Oriented Key Surfaces in Pipe Couplings
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Solution Overview
Problem
Existing mechanical pipe couplings lack angular flexibility while maintaining fluid-tight integrity, especially when used with standard groove pipes, which restricts their application in environments requiring dimensional and angular tolerances as well as thermal expansion.
Innovation Solution
A coupling design featuring segments with adjustably tightenable fasteners and arcuate keys that project inwardly, with angularly oriented mid-surfaces engaging the pipe elements, allowing for angular flexibility without compromising the seal, and deformable segments to conform to pipe curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical couplings are designed to be rigid to maintain fluid-tight integrity, then reliability is improved, but angular flexibility is reduced
Solution Approach 1:
The coupling is divided into multiple segments that can independently adjust their orientation. Each segment contains keys that engage with grooves on pipe elements, allowing the segments to rotate relative to each other while maintaining sealing contact, thus providing angular flexibility without compromising fluid-tight integrity.
Solution Approach 2:
The coupling design incorporates dynamic adjustment capability through its segmented structure and key-groove engagement mechanism. The segments can dynamically adjust their angular positions to accommodate pipe misalignment and thermal expansion, while the sealing surfaces maintain continuous contact to preserve fluid-tight integrity under varying conditions.
2Ease of operation
If couplings are made flexible to accommodate dimensional and angular tolerances, then ease of operation is improved, but structural stability deteriorates
Solution Approach 1:
By segmenting the coupling structure, each segment can independently absorb dimensional and angular variations through controlled movement and deformation. The segmented design allows the coupling to flexibly adapt to tolerance variations while the overall structure remains stable through the coordinated arrangement of segments and their connection mechanisms.
Solution Approach 2:
The coupling utilizes parameter changes in the form of controlled deformation of its segments and connection members. The structure is designed to undergo elastic deformation within specific parameter ranges to accommodate tolerances, while maintaining structural stability through material selection and geometric design that prevent excessive or permanent deformation.
3Adaptability or versatility
If couplings are designed for angular flexibility, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The segmentation of the coupling into modular segments with standardized interfaces simplifies manufacturing compared to a monolithic flexible coupling. Each segment can be manufactured independently using standard machining processes, and the angular flexibility is achieved through the simple yet effective key-groove engagement mechanism rather than complex articulated joints.
Solution Approach 2:
The use of arcuate keys with curved engagement surfaces simplifies the achievement of angular flexibility. The curved geometry of the keys and their engagement with corresponding grooves allows for smooth rotational movement between segments without requiring complex hinge mechanisms or articulated joints, thereby reducing manufacturing complexity while maintaining adaptability.
Data Source
AI summary
A mechanical pipe coupling is formed of segments attached end to end to surround a central space. Each segment has arcuate keys which project toward the central space. Each key is formed of a pair of side surfaces and a mid surface between them. The mid surface is angularly oriented relative to a longitudinal axis perpendicular to a plane containing the segments. When used to couple pipe elements having grooves the angular orientation of the mid surfaces provides flexibility to the joint. A method of joining pipe elements end to end is also disclosed.