Spherical High-Pressure Vessel for Fluid Dispensing
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Solution Overview
Problem
Current high-pressure plastic vessels used in fluid dispensing containers are limited by their cylindrical shape, which restricts volume and maximum pressure capacity due to material constraints and production processes, leading to instability and increased forces on the bottom plate when enlarged.
Innovation Solution
A pressure control system featuring a high-pressure vessel with an essentially spherical shape, allowing for increased volume and pressure capacity, produced through injection blow moulding from PET, with a ring-shaped member connecting hemispherical components and reinforced neck portions for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the high-pressure vessel is enlarged to increase volume, then the volume increases, but the forces on the bottom plate become much larger causing instability
Solution Approach 1:
The patent transitions from a cylindrical vessel shape to a spherical shape. The spherical geometry distributes internal pressure forces uniformly across the entire surface, eliminating concentrated loads on the bottom plate. This curvature principle allows the vessel to be enlarged while maintaining structural stability, as the spherical form inherently resists pressure-induced deformation better than cylindrical shapes with flat bottoms.
Solution Approach 2:
The spherical vessel is divided into multiple components: a spherical pressure chamber, a separate bottom plate, and connecting structures. This segmentation allows the bottom plate to be designed independently with optimized reinforcement, while the spherical chamber handles the pressure containment. The separation enables the bottom plate to be strengthened without compromising the overall vessel volume or pressure integrity.
2Strength
If the high-pressure vessel is made with reinforced opening to improve strength, then the strength increases, but the production process constraints limit the maximum volume
Solution Approach 1:
The spherical shape eliminates the need for reinforced openings at the ends of cylindrical vessels. The curved surface of a sphere naturally distributes stress uniformly, allowing openings to be made at optimal locations with standard reinforcement. This geometric principle removes the production constraints associated with stretch blow moulding of cylindrical vessels with reinforced ends, enabling larger volumes to be achieved.
3Volume of stationary object
If the high-pressure vessel is made spherical to increase volume, then the volume and pressure capacity increase, but the production process complexity changes
Solution Approach 1:
The spherical vessel is manufactured as separate components (spherical pressure chamber, bottom plate, connecting structures) that can be produced using conventional processes and then assembled. This segmentation allows each component to be optimized for its specific manufacturing requirements while maintaining the overall spherical geometry benefits. The modular approach simplifies production compared to attempting to manufacture a complete large-volume spherical vessel in a single process step.
Data Source
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AI summary
A novel pressure control system is described, which is provided for maintaining a constant predetermined excess pressure in a fluid dispensing container (1; 32; 42), comprising a high-pressure plastic vessel (10; 30; 40) having an inner chamber, a closed end and an open end, and a pressure control device (18) with a valve, which pressure control device is mounted on the open end of the high- pressure vessel (10; 30; 40), whereas a passageway is provided from the inner chamber to the outside, which is controlled by the valve, wherein the high-pressure vessel (10; 30; 40) is essentially spherical.