Pressurized Gas Tank Neck Sealing for Uniform Adhesive Thickness
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Solution Overview
Problem
Existing pressurized gas tanks, particularly those for hydrogen, face challenges in maintaining effective sealing at high pressures above 500 bar, as conventional seals deform and adhesive solutions struggle with uneven thickness, leading to mechanical weakness and potential gas leakage.
Innovation Solution
A sealing system featuring a hollow cylindrical neck with radially extending protrusions and a base with matching recesses, ensuring uniform paste sealant distribution between the neck and base, providing consistent mechanical strength and sealing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seals are used for pressurized gas tanks, then sealing is effective at pressures up to 500 bar, but at pressures above 500 bar the seals deform and extrude causing gas leakage
Solution Approach 1:
The patent removes the conventional seal element from the sealing system and replaces it with a paste sealant applied directly between the neck and base, eliminating the seal deformation and extrusion problems that occur at high pressures above 500 bar
Solution Approach 2:
The patent changes the sealing mechanism from a solid seal ring to a paste-like sealant material that can better withstand high pressures, and introduces protrusions on the neck to control the paste thickness and distribution, enabling effective sealing at pressures up to 1000 bar
2Reliability
If adhesive is used to join neck and base at high pressures, then sealing can be achieved, but the adhesive thickness is difficult to apply evenly leading to variable thickness and potential adhesive shearing
Solution Approach 1:
The patent incorporates protrusions on the neck surface before applying the paste sealant, which pre-establish the spacing and distribution pattern for the adhesive layer, ensuring uniform thickness before the actual sealing operation occurs
Solution Approach 2:
The protrusions act as intermediary elements between the neck and base, controlling the paste sealant distribution and thickness uniformly across the bonding surface, preventing local insufficient thickness that would lead to adhesive shearing under high pressure
3Reliability
If adhesive is used to join neck and base, then sealing can be achieved, but variable adhesive thickness results in insufficient mechanical strength and adhesive shearing under high pressure
Solution Approach 1:
The protrusions are pre-formed on the neck surface to control and ensure uniform adhesive thickness distribution, preventing local insufficient thickness that would compromise mechanical strength and lead to adhesive shearing under high pressure conditions
Solution Approach 2:
The patent changes the adhesive application method by using protrusions to control paste thickness, transforming the variable thickness problem into a controlled uniform thickness solution that maintains sufficient mechanical strength at pressures up to 1000 bar
Data Source
AI summary
A tank for pressurized gas such as hydrogen, comprises a paste sealant, a sealing envelope, and a base comprising a recess accommodating a neck. A substantially annular external cavity is between a convex surfaces of the neck and a concave surfaces of the recess A substantially annular inner cavity is between a concave surface of the neck and a convex surface of the recess. The paste sealant occupies the annular external and annular inner cavities uniformly and thus ensures the mechanical strength and the gas seal between the sealing envelope and the base. The sealing envelope comprises a body and a neck on the surfaces of which at least two angularly equidistant protrusions extend radially.