Multilayer Pressure Vessel Joining Structure to Prevent Layer Gaps
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Solution Overview
Problem
Existing pressure vessels experience gap formation between layers due to differing coefficients of thermal expansion and material choices, leading to potential defects and instability during temperature changes and manufacturing.
Innovation Solution
Introduce an adhesive layer between the layers of the pressure vessel, particularly at interfaces with inlet or centering bodies, to compensate for forces and prevent gap formation, using materials like epoxy resin and carbon fiber reinforced plastic (CFRP) with adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different materials (plastics, metals, composite materials) are used for inner container, boss, and outer container, then the pressure vessel can be optimized for specific functions (sealing, pressure stability, shock resistance), but gap formation occurs between layers due to different coefficients of thermal expansion
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the inner container and outer container layers. This adhesive layer compensates for the different coefficients of thermal expansion by providing a compliant bonding interface that can accommodate dimensional changes without creating gaps, while still maintaining strong structural attachment between the dissimilar materials.
Solution Approach 2:
The adhesive layer changes the physical and chemical parameters of the interface between layers. By selecting adhesives with specific properties (viscosity, curing characteristics, thermal expansion coefficients), the bonding interface can be optimized to accommodate thermal cycling and prevent gap formation while maintaining the functional advantages of different materials.
2Reliability
If adhesive is applied to bind layers together, then gap formation is prevented and structural integrity is enhanced, but the complexity of the manufacturing process increases
Solution Approach 1:
The adhesive is applied in advance to the bonding surfaces before final assembly of the pressure vessel layers. This preliminary application ensures that the adhesive is properly distributed and positioned, reducing the need for complex adjustment procedures during assembly and simplifying the overall manufacturing process while ensuring reliable bonding.
3Stability of the object's composition
If adhesive layer thickness is increased to compensate for forces and prevent gaps, then gap prevention is improved, but the volume and weight of the pressure vessel increase
Solution Approach 1:
The adhesive layer is applied selectively at specific locations where gap formation is most likely to occur, such as at the interfaces between layers and at the boss connections. This localized application provides effective gap prevention and force compensation at critical areas without unnecessarily increasing the overall volume and weight of the pressure vessel through uniform thick adhesive coverage.
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 adhesive layer effectively binds the layers together, preventing gaps and reducing stress concentrations, enhancing structural integrity and thermal insulation while minimizing relative movements.
Implementation Method 1
an joining agent is introduced between at least two layers of the pressure vessel in at least one planar area, which forms a further layer and compensates for forces occurring between the at least two layers of the pressure vessel within this further layer and prevents the formation of gaps
Implementation Method 2
the outer container is spaced apart from the inner container and a vacuum is maintained in the space between them for thermal insulation. Additionally, the inner container is surrounded on its outer surface by an insulating layer.
Data Source
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AI summary
The invention relates to a method for producing a pressure container (100) having multiple layers and comprising a cylindrical central part with two curved side parts, wherein at least one side part has a filling opening (108), characterised in that a joining means is introduced between at least two layers (216, 218) of the pressure container (100) in at least one flat region, which joining means forms a further layer (224, 230) and compensates for forces occurring between the at least two layers (224, 230) of the pressure container (100) within this further layer (224, 230), and prevents the formation of a gap in this at least one flat region.