High Pressure Tank Liner Mouthpiece Anti-Rotation Interface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High pressure tanks with metal mouthpieces and resin liners experience distortion due to differences in expansion coefficients, leading to idle rotation and stress on the reinforcement layer during internal pressure variations, which existing serrate-shaped mouthpieces attempt to mitigate but with limited success.
Innovation Solution
A high pressure tank design featuring a liner with projections on its contact surface and a mouthpiece with corresponding recesses, arranged radially and with engagement elements, to prevent idle rotation and separation, thereby reducing the boundary stress and distortion in the reinforcement layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the mouthpiece is formed in a serrate shape to suppress idle rotation, then idle rotation is suppressed, but the boundary between the mouthpiece and liner becomes longer causing distortion at multiple positions in the reinforcement layer
Solution Approach 1:
The contact surface is segmented into multiple localized engagement points (protrusions and recesses) rather than using a continuous serrate shape. This segmentation provides sufficient anti-rotation capability while minimizing the total boundary length between mouthpiece and liner, thereby reducing distortion in the reinforcement layer.
2Shape
If the mouthpiece is formed in a circular shape to reduce boundary length, then distortion is reduced, but idle rotation occurs during filament winding
Solution Approach 1:
While the overall mouthpiece maintains a substantially circular shape, asymmetric protrusions and recesses are introduced at specific locations on the contact surface. This asymmetric feature provides the necessary anti-rotation function while preserving the circular geometry that minimizes boundary length and distortion.
3Stability of the object's composition
If a serrate-shaped mouthpiece is used to prevent idle rotation, then idle rotation is suppressed, but stress concentration occurs at the longer boundary between mouthpiece and liner
Solution Approach 1:
The stress distribution is improved by segmenting the contact interface into discrete protrusion-recess pairs rather than a continuous serrate boundary. This segmentation reduces the total boundary length and distributes stress more evenly, preventing stress concentration that would occur with a long serrate interface.
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 configuration effectively suppresses idle rotation and distortion of the reinforcement layer by aligning projections with torque and engaging elements to maintain contact, ensuring uniform engagement and reducing stress on the boundary between the liner and mouthpiece, enhancing the tank's structural integrity and manufacturing ease.
Implementation Method 1
One of the first contact surface and the second contact surface may include projections, and the other may include recesses in which the projections being fitted
Implementation Method 2
a reinforcement layer provided to cover the entire tank main body and have pressure resistance
Implementation Method 3
thermally cures the thermosetting resin included in the reinforced fibers, so as to form the reinforcement layer
Data Source
AI summary
The high pressure tank comprises a tank main body including a liner made of a resin and a mouthpiece made of a non-resin material and mounted to an open end of the liner; and a reinforcement layer provided to cover the entire tank main body and have pressure resistance. The liner includes a first contact surface arranged approximately perpendicular to a central axis of the liner to come into contact with the mouthpiece. The mouthpiece includes a second contact surface arranged to come into contact with the first contact surface of the liner. One of the first contact surface and the second contact surface includes projections, and the other includes recesses in which the projections being fitted. The second contact surface is formed in an approximately circular shape.