Fuel Cell Anode Valve Sealing With Magnetic Field Isolation
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Solution Overview
Problem
Anode valves in hydrogen fuel cell systems for automotive transport face challenges in ensuring high reliability due to the harsh environment of contact with gas and liquid mixtures, which affects their service life.
Innovation Solution
The anode valve design incorporates an elastically deformable shutter with a synthetic rubber diaphragm and a solenoid-actuated mechanism, featuring a ferromagnetic core and a non-magnetic band to enhance sealing and magnetic field control, along with a heater to prevent ice formation, ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve design is used, then the structure is simple, but the reliability is insufficient due to contact with harsh gas and liquid mixtures
Solution Approach 1:
The valve is divided into separate functional components: a shutter element for flow control, a diaphragm for sealing, a solenoid actuator for operation, and a heater for ice prevention. This segmentation allows each component to be optimized for its specific function while improving overall reliability in harsh environments.
Solution Approach 2:
A non-magnetic band is introduced as an intermediary component between the ferromagnetic core and the outer casing. This band prevents direct contact between the magnetic field components and the hydrogen environment, eliminating magnetic interference while maintaining structural integrity and improving reliability.
2Reliability
If an elastically deformable shutter with diaphragm is used, then sealing is improved, but manufacturing complexity increases
Solution Approach 1:
A flexible diaphragm made of elastomeric material is used to create the sealing surface of the shutter. This flexible film deforms elastically to ensure hermetic sealing against the valve seat, maintaining reliable sealing performance while allowing for relatively simple manufacturing processes for rubber components.
3Power
If a ferromagnetic core is used in the solenoid, then magnetic field strength is improved, but interference with hydrogen environment occurs
Solution Approach 1:
A non-magnetic band is positioned between the ferromagnetic core and the hydrogen-containing environment. This intermediary component allows the strong magnetic field to be generated by the ferromagnetic core for effective solenoid operation, while simultaneously preventing magnetic interference with the hydrogen fuel cell system components.
Solution Approach 2:
The valve structure employs different magnetic properties in different regions: ferromagnetic materials are used locally in the solenoid core where strong magnetic fields are needed for actuation, while non-magnetic materials are used in regions exposed to hydrogen to prevent interference. This localized differentiation resolves the contradiction between magnetic field strength and magnetic interference.
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 design significantly enhances the reliability of the anode valve by maintaining a hermetic seal and ensuring efficient fluid discharge, even under varying conditions, thereby extending its service life and performance.
Implementation Method 1
an electromagnetic actuator, featuring a ferromagnetic core and a non-magnetic band
Implementation Method 2
solenoid-actuated mechanism
Implementation Method 3
along with a heater to prevent ice formation
Implementation Method 4
an at least partially elastically deformable shutter... with an elastically deformable shutter diaphragm
Data Source
Figure 1
Figure 2
AI summary
An anode valve (1) for a downstream fuel cell circuit of an automotive transport system comprises a valve body (2), a diaphragm shutter (8), a solenoid device, an inner casing (20) wherein the movable core (48) is arranged, and a fixed guide (40) including a stem (44) on which the movable core (48) slides. The inner casing (20) comprises an annular band (38), made of non-magnetic metal material, arranged between the coil (70) and the second chamber (34) to deviate the magnetic field and convey it into the movable core (48). The shutter diaphragm (12) is permanently pressed against a bearing surface (16) of the valve body (2) to hermetically separate the inlet pipe (4) and the outlet pipe (6) from the area where the band (38) is located.