Monolithic Magnetic Actuator Core Tube for Hydrogen Tightness
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Solution Overview
Problem
Existing magnetic actuator devices face challenges in achieving hydrogen gas tightness, particularly for small H2 molecules, with potential leakages through sealing points or material imperfections, which can compromise their functionality in applications like fuel cells and electrolyzers.
Innovation Solution
A monolithic magnetic actuator device with a core tube that is magnetically separated along its axial direction, utilizing a combination of material microstructural transformation and tapering to create a separation region with a reduced wall thickness, eliminating the need for sealing points and ensuring high tightness against hydrogen leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing points (soldering or welding) are used to achieve hydrogen gas tightness, then the tightness against hydrogen leakage is improved, but the risk of leakage due to shrink holes or material imperfections increases and the device complexity increases
Solution Approach 1:
The core tube and magnetic core are merged into a single monolithic component formed from one piece of magnetic material. This eliminates the need for separate sealing points, soldering, or welding between the core tube and magnetic core, thereby removing potential leakage paths while simplifying the device structure.
Solution Approach 2:
The monolithic component is magnetically segmented into functionally separated regions: a first region with high magnetic permeability for magnetic flux conduction and a second region with low magnetic permeability for magnetic separation. This segmentation achieves magnetic functionality without requiring physical sealing points.
2Device complexity
If a monolithic core tube with magnetic separation is used, then the device complexity is reduced and manufacturing is simplified, but achieving hydrogen gas tightness against small H2 molecules becomes more challenging
Solution Approach 1:
Different regions of the monolithic core tube are assigned different local qualities: the first region has high magnetic permeability for magnetic flux conduction while the second region has low magnetic permeability for magnetic separation. Both regions maintain sufficient wall thickness and structural integrity to prevent hydrogen gas penetration, achieving tightness without complex sealing mechanisms.
3Reliability
If the core tube wall thickness is reduced in the separation region, then the magnetic separation effectiveness is improved, but the structural strength and tightness against hydrogen leakage may be compromised
Solution Approach 1:
The core tube wall thickness is locally optimized: in the separation region, the wall thickness is reduced to enhance magnetic separation effectiveness, while in other regions the wall thickness is maintained at sufficient levels to ensure structural strength and hydrogen gas tightness. This local differentiation achieves both magnetic performance and structural integrity.
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
The solution achieves hydrogen gas tightness of less than 10−4 mbar l/s, maintaining functional parameters and stability, while avoiding leakages and simplifying construction, making it suitable for fuel cells and electrolyzers.
Implementation Method 1
The magnetic separation of the monolithic core tube is brought about by a demagnetization of a material of the core tube wall of the core tube in a separation region of the core tube, in particular generated by thermal microstructural transformation of the material of the core tube wall, e.g. by induction or by laser annealing.
Implementation Method 2
The magnetic separation of the monolithic core tube is brought about by a demagnetization of a material of the core tube wall of the core tube in a separation region of the core tube, in particular generated by thermal microstructural transformation of the material of the core tube wall, e.g. by induction or by laser annealing.
Data Source
AI summary
A magnetic actuator device, in particular hydrogen-gas-tight magnetic actuator device, includes at least one magnetic core and at least one core tube, which is at least substantially magnetically separated along its axial direction, wherein, for achieving a hydrogen gas tightness, the magnetic core is formed completely closed in the axial direction at least on one side and the core tube is realized monolithically with the magnetic core.