NMR Probe Head Centering Mechanism for Vial Protection
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Solution Overview
Problem
NMR probe heads face damage during sample vial insertion due to inadequate radial guidance, leading to time-consuming and costly repairs, especially in high-throughput analytical systems with automatic sample changers.
Innovation Solution
The implementation of additional centering devices above and below the NMR coil system, with strategically designed passage openings and geometric shapes, restricts the sample vial's radial movement, preventing contact with sensitive components during transport and ensuring precise centering in the measuring position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NMR coil inside diameter is reduced to improve fill factor and sensitivity, then measurement precision is improved, but the risk of collision with fragile components during sample vial insertion increases
Solution Approach 1:
The sample vial is radially centered by guide elements positioned above the NMR coil before the vial reaches the coil region. This preliminary centering action prevents lateral deviation that would cause collision with fragile components during subsequent insertion
Solution Approach 2:
Guide elements act as intermediary components between the sample vial transport system and the NMR coil. These guides mediate the insertion process by constraining radial movement and directing the vial along a safe path that avoids fragile components
2Productivity
If automatic sample vial changers are used to increase productivity, then productivity is improved, but the frequency of sample vial insertions increases, thereby increasing the probability of damage to probe head components
Solution Approach 1:
The guide elements perform preliminary radial centering of the sample vial before it reaches the endangered region around the NMR coil. This advance guidance ensures that even with frequent automatic insertions, the vial maintains proper alignment and avoids damaging fragile components
Solution Approach 2:
The guide elements enable rapid, safe passage of the sample vial through the insertion zone by providing continuous radial constraint. This allows high-speed automatic sample changing while maintaining protection against collisions during the critical insertion phase
3Manufacturing precision
If centering devices are positioned close to the NMR coil to improve centering precision, then manufacturing precision is improved, but the risk of interfering with the NMR measurement field increases
Solution Approach 1:
The guide elements are positioned in the axial dimension above the NMR coil rather than radially adjacent to it. This spatial arrangement in another dimension allows precise radial centering functionality while maintaining sufficient axial distance to avoid interference with the NMR measurement field
Data Source
AI summary
An NMR probe head (3) has a coil system (9) and a radial centering mechanism for a sample vial (4) having two centering devices spaced axially from each other to center the sample vial in the radial direction only. The first centering device (5) is disposed above the receiver coil system and at least one further centering device (6) is disposed axially above the coil system with an axial spacing (d) above the first centering device. The first and second centering devices restrict the radial scope for movement of the sample vial to such an extent that the sample vial cannot touch an endangered space (7) during the entire duration of transport of the sample vial to its measuring position, thereby precluding damage to the probe head components in the endangered space by the sample vial.