Hydrogen Valve Block Sealing Faces Under Selective Anodizing
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Solution Overview
Problem
The aluminum anodizing treatment on valve blocks for high-pressure hydrogen gas deteriorates the sealing properties and strength of the inner flow channel, especially at intersection parts, due to roughening and stress concentration, compromising durability and corrosion resistance.
Innovation Solution
A valve block with an aluminum body where the outer surface undergoes aluminum anodizing treatment to maintain corrosion resistance, while the inner flow channel's sealing face is machined to prevent roughening and ensure strength, and the flow channel is formed after masking or before anodizing to maintain machined faces and prevent hydrogen gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum anodizing treatment is performed on the inner face of the flow channel, then corrosion resistance is improved, but the sealing properties deteriorate due to roughening of the sealing face
Solution Approach 1:
The patent applies different surface treatments to different regions of the valve block: the outer surface receives aluminum anodizing treatment for corrosion resistance, while the inner sealing face is machined to maintain smooth sealing properties. This local differentiation resolves the contradiction by providing corrosion resistance where needed without compromising sealing quality.
2Reliability
If aluminum anodizing treatment is performed on the inner face of the flow channel, then corrosion resistance is improved, but the strength deteriorates due to stress concentration at intersection parts
Solution Approach 1:
The patent applies aluminum anodizing treatment only to the outer surface of the valve block, not to the inner flow channel surfaces. This local differentiation provides corrosion resistance to the outer surface while maintaining the strength and stress resistance of the inner flow channel intersection parts.
3Reliability
If aluminum anodizing treatment is performed on the outer surface, then corrosion resistance is maintained, but the inner flow channel surfaces are roughened causing hydrogen gas leakage
Solution Approach 1:
The patent performs machining of the inner flow channel surfaces to create smooth sealing faces before applying aluminum anodizing treatment to the outer surface. This preliminary action ensures that the sealing faces maintain their smoothness and sealing capability even after the anodizing process is completed on the outer surface.
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 approach effectively suppresses the negative influences of aluminum anodizing on the inner face while maintaining outer surface corrosion resistance, ensuring the durability and sealing properties of the valve block's inner flow channel.
Implementation Method 1
an aluminum anodizing treatment is performed on the valve block to improve the corrosion resistance
Implementation Method 2
an oxidized layer is formed on the outer surface of the valve block by an aluminum anodizing treatment
Data Source
AI summary
A valve block for hydrogen gas includes a valve block body having an outer surface on which an aluminum anodizing treatment has been performed, and a flow channel for hydrogen gas formed in the valve block body, and the flow channel has a sealing face in an inner face, and the sealing face is a machined face.