Hemispherical Irrigation Joint for Torsion and Pipe Misalignment
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Solution Overview
Problem
Irrigation systems experience stress and damage due to torsional forces from ground variations and misalignment of motor speeds, leading to pipe section joint and component damage over time.
Innovation Solution
An irrigation system joint that allows three degrees of freedom between pipe sections, utilizing a hemispherical surface and cavity contact to reduce stress, enabling up to 30% torsion and 17-degree axial rotation, and up to 5-foot misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid pipe section joints are used, then structural strength is improved, but stress and damage from ground variations and misalignment increase
Solution Approach 1:
The joint incorporates a hemispherical surface and cavity contact mechanism that allows dynamic movement and adjustment. The pipe sections can rotate and shift relative to each other within the joint, transforming the rigid connection into a dynamic one that adapts to ground variations and misalignment, thereby maintaining both strength and reliability
Solution Approach 2:
The joint design changes the connection parameters by introducing three degrees of freedom (two rotational and one translational). This allows the joint to accommodate variations in position and orientation while maintaining structural integrity, effectively resolving the contradiction between rigidity and adaptability
2Manufacturing precision
If fixed alignment is maintained, then manufacturing precision is improved, but adaptability to field variations deteriorates
Solution Approach 1:
The joint allows dynamic adjustment of pipe section alignment through its hemispherical-cavity contact mechanism. The pipe sections can rotate and shift within the joint to accommodate field variations while maintaining a precise aligned configuration during operation, thus preserving manufacturing precision while enhancing adaptability
Solution Approach 2:
The joint introduces movement in multiple dimensions by allowing rotation about two perpendicular axes and translation along the pipe axis. This multi-dimensional freedom enables the system to adapt to various misalignments while maintaining proper operational alignment
3Stress or pressure
If three degrees of freedom are allowed in the joint, then stress reduction is improved, but device complexity increases
Solution Approach 1:
The joint uses a hemispherical surface and cavity contact mechanism to provide three degrees of freedom. This spherical geometry naturally allows rotation and movement while distributing stresses evenly, achieving stress reduction without requiring complex mechanical components or multiple moving parts
Data Source
AI summary
An irrigation system joint couples first and second adjacent pipe sections that are coaxial along a central axis when aligned. The joint includes a first portion and a second portion. The first portion is for securing to the first pipe section and includes an upwardly facing hemispherical surface. The second portion is for securing to the second pipe section and includes a cavity that receives at least a portion of the hemispherical surface to form a contact line coincident with the central axis when the pipe sections are aligned.