Piston Member Hydrogen Passage Design for Stable Electrolysis
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Solution Overview
Problem
Existing high-pressure hydrogen producing apparatuses face challenges in maintaining stable electrolysis performance across varying operating pressures, requiring complex compression mechanisms and external high-pressure fluid facilities.
Innovation Solution
A high-pressure hydrogen producing apparatus featuring a cell device with stacked unit cells and a piston member that applies a uniform pressing force using hydrogen passages spaced at equal angular intervals, allowing high-pressure hydrogen to flow and lead out, thus eliminating the need for external high-pressure fluid facilities and ensuring stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a complex compression mechanism with external high-pressure fluid facilities is used, then high-pressure hydrogen production is achieved, but device complexity increases
Solution Approach 1:
The generated hydrogen itself is used as the compression fluid to apply pressing force to the cell unit. The hydrogen passage in the piston member allows hydrogen to flow and generate compression force, eliminating the need for external high-pressure fluid facilities. This self-service approach resolves the contradiction by using the system's own output (hydrogen) to achieve the required pressure without external complexity.
Solution Approach 2:
The compression mechanism is merged with the hydrogen storage and delivery system. The piston member serves dual functions: storing hydrogen and applying compression force to the cell unit. The hydrogen passage integrates the fluid delivery path with the compression mechanism, combining previously separate functions into a unified structure that reduces overall device complexity.
2Reliability
If a compression mechanism is used to maintain constant clamping pressure, then stable electrolysis performance is achieved, but the structure becomes more complex
Solution Approach 1:
The hydrogen generated during electrolysis flows through the hydrogen passage in the piston member, automatically generating the compression force needed to maintain constant clamping pressure on the cell unit. This self-regulating mechanism maintains stable electrolysis performance without requiring complex external compression control systems.
Solution Approach 2:
The system establishes a feedback loop where the hydrogen pressure generated during electrolysis automatically regulates the clamping force on the cell unit. As hydrogen is produced and pressurized, it flows back through the piston member's hydrogen passage, creating a self-adjusting compression force that maintains optimal contact pressure between cell components throughout the electrolysis process.
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 apparatus achieves stable and efficient hydrogen production with reduced electrolysis voltage and minimized piston tilt, applying a uniform load without external high-pressure fluid facilities, resulting in a simple and economical structure.
Implementation Method 1
The piston member is to apply a pressing force to the cell device from an end of the piston member in a stacking direction
Implementation Method 2
a solid polymer electrolyte membrane (ion-exchange membrane)... For decomposing water to generate hydrogen (and oxygen), the water electrolysis apparatus uses a solid polymer electrolyte membrane
Implementation Method 3
The hydrogen communication hole extends in the stacking direction of the unit cells, communicates with the hydrogen flow path, and allows the hydrogen to flow in the stacking direction
Data Source
AI summary
A high-pressure hydrogen producing apparatus includes a cell device and a piston member. The piston member is to apply a pressing force to the cell device from an end of the piston member in a stacking direction in which unit cells are stacked. The piston member is provided with a first hydrogen passage, at least one second hydrogen passage, and a hydrogen lead-out passage. The first hydrogen passage and the second hydrogen passage are spaced at substantially equal angular intervals on a virtual circle centered on a center of an end face of the piston member.