Hydrogen Tank Cap and Outer Cylinder Assembly for Easier Production
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Solution Overview
Problem
The existing high-pressure hydrogen tank designs for transportation vehicles require extensive time and effort to produce, leading to increased production costs due to complex configurations and stress management.
Innovation Solution
A high-pressure hydrogen tank design featuring a metal circular cylinder, a cap part, an outer cylinder, and a fastening part, where the cap part is fixed to the outer cylinder using bolts, simplifying the production process while ensuring safety and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick circular-cylindrical portion is used to reduce stress level, then safety is improved, but production time and effort increase significantly
Solution Approach 1:
The tank body is divided into a thin-walled circular-cylindrical portion and a separate reinforcement structure (dome-shaped portion with rib). The circular-cylindrical portion uses a thin wall for easy production, while the reinforcement structure provides the necessary stress reduction, separating the functions of ease of manufacture and safety
Solution Approach 2:
Instead of increasing wall thickness in the radial dimension, the invention adds a dome-shaped portion with rib extending in the axial dimension. This dimensional transition provides structural reinforcement without requiring a thick circular-cylindrical portion, thus maintaining easy producibility while ensuring safety
2Reliability
If a thick circular-cylindrical portion is used to reduce stress level, then safety is improved, but production costs increase
Solution Approach 1:
The tank body is divided into a thin-walled circular-cylindrical portion and a separate reinforcement structure (dome-shaped portion with rib). The circular-cylindrical portion uses a thin wall for easy production, while the reinforcement structure provides the necessary stress reduction, separating the functions of ease of manufacture and safety
Solution Approach 2:
The invention changes the structural parameters by using a thin wall thickness in the circular-cylindrical portion combined with a specific dome-shaped geometry and rib configuration. This parameter change allows achieving the required stress level without the need for thick walls, thus reducing production costs while maintaining safety
3Strength
If a dome-shaped portion is formed at one end of a thick circular-cylindrical portion, then stress distribution is improved, but production complexity increases
Solution Approach 1:
The reinforcement function is segmented into a dome-shaped portion and a rib structure. The dome-shaped portion provides the basic stress distribution improvement, while the rib adds targeted reinforcement. This segmentation allows each component to be relatively simple to produce while collectively achieving excellent stress distribution
Solution Approach 2:
The invention transitions from a two-dimensional thick wall concept to a three-dimensional structure with a dome-shaped portion and axial rib. This dimensional change provides effective stress distribution through geometric form rather than material quantity, reducing production complexity while improving strength
Data Source
AI summary
A high-pressure hydrogen tank includes a metal circular cylinder configured to store high-pressure hydrogen therein, a cap part configured to cover each of opposite end portions of the metal circular cylinder, an outer cylinder surrounding an outer periphery of a circular-cylindrical portion of the metal circular cylinder, and a fastening part configured to fix the cap part to the outer cylinder.