Magnetic Coupling Bearing Reduces Side Loading
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Solution Overview
Problem
Magnetic coupling systems in fluid displacement devices often suffer from side loading due to magnetic attractive forces, leading to premature seal degradation and reduced accuracy, especially in precision dispensing applications.
Innovation Solution
A magnetic coupling system with a bearing positioned between the magnetic couplers reduces side loading on the piston by allowing the magnetic portions to separate and roll, maintaining coupling while minimizing friction and backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnetic couplers are used to prevent axial and angular misalignment, then alignment between actuator and piston is improved, but side loading on the piston increases due to magnetic attractive forces
Solution Approach 1:
A bearing is introduced as an intermediary element between the two magnetic couplers. The first magnetic coupler magnetically couples to the bearing, and the bearing mechanically couples to the second magnetic coupler on the piston. This intermediary bearing allows the magnetic coupling to maintain alignment while preventing direct transmission of lateral magnetic forces to the piston wall.
Solution Approach 2:
The patent replaces a direct rigid mechanical connection between actuator and piston with a magnetic coupling system mediated by a bearing. This substitution allows for flexible force transmission along the axial direction while isolating the piston from harmful lateral loads through the bearing's radial support capability.
2Stability of the object's composition
If a rigid magnetic coupling is used to maintain alignment, then misalignment is prevented, but precision dispensing accuracy deteriorates due to magnetic resistance and side loading
Solution Approach 1:
The bearing acts as a mediator that decouples the stability function from the precision function. It provides stable magnetic coupling alignment while preventing the transmission of destabilizing lateral forces that would compromise dispensing precision.
Solution Approach 2:
The coupling system is segmented into three distinct functional elements: the first magnetic coupler for magnetic attraction, the bearing for radial support and alignment, and the second magnetic coupler for force transmission to the piston. This segmentation allows each element to optimize its specific function without compromising overall precision.
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 configuration enhances precision and reduces backlash, improving the accuracy and longevity of fluid transfer devices by minimizing wear and leakage, as demonstrated by a significant reduction in coefficient of variation and lost motion during piston operation.
Implementation Method 1
A magnetic coupling system with a bearing positioned between the magnetic couplers reduces side loading on the piston by allowing the magnetic portions to separate and roll
Implementation Method 2
the attractive forces of the magnets sometimes result in side loads on the piston
Data Source
AI summary
A magnetic coupling system may be used in a fluid displacement apparatus to magnetically couple a drive shaft to a piston. The magnetic coupling system may include first and second magnetic couplers at the ends of the drive shaft and piston, respectively. The first magnetic coupler and second magnetic coupler may be configured to exert an attractive force. A bearing between the magnetic couplers reduces friction and side loading.