Non-Circular Pressure Vessel Structure for Efficient Packaging
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Solution Overview
Problem
Circular pressure vessels are not optimized for containment volume, leading to packaging inefficiencies when rectangular packaging space is required, and they face challenges in welding due to their circular shape.
Innovation Solution
Designing pressure vessels with a non-circular shape, such as rounded rectangles, and incorporating stiffening ribs and varying wall thicknesses to enhance strength and minimize stress, along with caps for a secure fit and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If circular pressure vessels are used, then they are good at withstanding elevated pressures, but they cause packaging inefficiencies when rectangular packaging space is required
Solution Approach 1:
The pressure vessel transitions from a symmetric circular cross-section to an asymmetric non-circular cross-section (such as rounded rectangle or oval shape). This asymmetric design allows the vessel to better fit rectangular packaging spaces and maximize containment volume efficiency while maintaining structural integrity for pressure withstanding
2Volume of moving object
If non-circular pressure vessels are used, then packaging efficiency is improved, but welding becomes more difficult due to the non-circular shape
Solution Approach 1:
The non-circular pressure vessel incorporates localized flat sections or planar surfaces at specific locations (such as at the ends or along portions of the circumference) while maintaining the overall non-circular cross-section. These local flat areas provide accessible surfaces for welding operations, caps, and fittings, thereby facilitating manufacturing and assembly processes despite the non-circular geometry
3Volume of moving object
If non-circular pressure vessels are used, then volumetric capacity requirements are met, but the vessel shape is more complex
Solution Approach 1:
The pressure vessel employs a non-circular cross-section with rounded corners or curved transitions (such as an oval or rounded rectangle shape) rather than sharp angles or complex geometries. This curved design maximizes volumetric capacity while maintaining manufacturing feasibility and structural integrity, avoiding excessive shape complexity
Data Source
AI summary
A reservoir assembly includes one or more pressure vessels each having a non-circular cross-sectional shape including a rounded rectangle having four generally flat sides with rounded corners. The pressure vessels may be formed of extruded metal, such as aluminum, and have a generally constant cross-section. The pressure vessels include stiffening ribs and varying wall thicknesses to improve strength and to minimize stresses when pressurized, such as during operation when filled with compressed gas. The stiffening ribs meet in the center of each of the pressure vessels and divide the interior volumes into four equal sections. A cap of stamped aluminum is fitted and fully welded to enclose each end of the pressure vessels. One or both of the caps on each of the pressure vessels has a pressure fitting. Two or more pressure vessels extend parallel to one another and are attached together to form the reservoir assembly.