Pressure Vessel Stock Composite Resin Liner Adhesion
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Solution Overview
Problem
Pressure vessels with blow-molded liner bodies and FRP layers face issues with insufficient adhesive strength and gas sealing properties due to metal or resin stock materials, leading to potential degradation in sealing and rigidity.
Innovation Solution
A pressure vessel design featuring a metal stock with a cylindrical section and annular metal flange section, covered by a molded synthetic resin piece that adheres to the liner body, enhancing adhesive strength and gas sealing properties through a resin flange section with specific geometric features and injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stock is formed of metal, then strength and rigidity are improved, but adhesive strength between the stock and liner body becomes insufficient
Solution Approach 1:
The patent applies composite materials by combining metal and synthetic resin in the stock structure. The metal portion (cylindrical section and inner circumferential portion of flange section) provides strength and rigidity, while the synthetic resin portion (outer circumferential portion of flange section) provides adhesive strength to the liner body. This composite structure resolves the contradiction between mechanical strength and adhesive bonding.
2Reliability
If the stock is formed of resin, then adhesive strength is improved, but strength and rigidity become insufficient
Solution Approach 1:
The patent uses a composite stock structure where the metal component provides the necessary strength and rigidity, while the synthetic resin component ensures adequate adhesive strength. The metal cylindrical section and inner flange portion provide structural integrity, while the resin outer flange portion bonds to the liner body, resolving the contradiction between adhesive strength and mechanical strength.
3Reliability
If the flange section is made of resin, then adhesive strength is improved, but rigidity of the flange section is lowered causing bending during molding
Solution Approach 1:
The patent applies composite materials in the flange section by combining metal and synthetic resin. The metal inner circumferential portion maintains rigidity to prevent bending during molding, while the resin outer circumferential portion provides adhesive strength to the liner body. This composite approach resolves the contradiction between rigidity and adhesive strength in the flange section.
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 design achieves improved strength, rigidity, and gas sealing properties by ensuring strong adhesion between the stock and liner body, preventing flange bending and maintaining integrity, thus enhancing the overall performance of the pressure vessel.
Implementation Method 1
The adhesive resin 4 provided on the outer surface of the stock 3 melts by heat of the parison 9, and the parison 9 and the stock 3 are bonded to each other.
Implementation Method 2
By blowing air into the parison 9 to inflate the parison 9 and press it against the inner surface of the dies 7, the liner body 1 is molded.
Data Source
AI summary
A pressure vessel comprises a liner formed by blow-molding; an FRP layer covers the outer surface of the liner; and a stock comprising a stock main body, formed from metal with a cylindrical section passing through the liner and FRP layer and a circular metal flange section projecting outward from one end of the cylindrical section in the radial direction of the cylindrical section, and a molded piece, formed of a synthetic resin, covers at least the outer circumferential surface of the cylindrical section and all the metal flange section of the stock main body, has a circular resin flange section projecting outward from the edge of the metal flange section that faces outward in the radial direction, and adheres to the inner surface of the liner. The resin flange section comprises an upper surface, an outer circumferential edge surface and a lower surface.