Cylindrical PET Vessel with Spherical Dome for High-Pressure Control
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Solution Overview
Problem
Current high-pressure plastic vessels used in pressure control systems have limited volume and stability due to material constraints and the injection stretch blow molding process, restricting their ability to withstand higher pressures and larger diameters.
Innovation Solution
A pressure control system featuring a substantially cylindrical high-pressure plastic vessel with a spherical dome and internal reinforcing fins, made from PET via injection molding, which allows for a larger diameter and higher pressure resistance, and a gas-tight connection using laser welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the high-pressure vessel is enlarged to increase volume, then the vessel capacity increases, but the material strength and structural stability deteriorate due to increased forces on the bottom plate and walls
Solution Approach 1:
The patent applies spherical geometry to the high-pressure vessel design. The spherical shape distributes internal pressure forces uniformly across the surface, eliminating stress concentration points that would occur in cylindrical designs. This geometric transformation allows the vessel to withstand higher pressures and larger volumes without requiring proportionally thicker walls or stronger materials, directly resolving the contradiction between volume enlargement and structural strength.
Solution Approach 2:
The patent employs composite construction by combining the spherical plastic vessel with a metal reinforcement cage or framework. This composite structure allows the plastic material to contain the fluid while the metal framework provides additional structural support and pressure distribution. The combination enables the vessel to achieve larger volumes with maintained structural integrity, as the metal reinforcement compensates for the limitations of plastic materials under high pressure.
2Volume of stationary object
If the vessel diameter is increased to improve capacity, then the storage volume increases, but the pressure resistance deteriorates due to higher forces on the vessel walls
Solution Approach 1:
The spherical geometry fundamentally changes the stress distribution pattern in the vessel walls. Unlike cylindrical vessels where hoop stress increases linearly with diameter, spherical vessels distribute stress uniformly across the entire surface area. This allows the vessel diameter to be increased for greater capacity without proportionally increasing wall stress, thereby maintaining pressure resistance despite larger dimensions.
Solution Approach 2:
The patent transitions from a two-dimensional cylindrical surface to a three-dimensional spherical surface. This dimensional change adds structural efficiency because the spherical surface area increases more slowly relative to volume compared to cylindrical designs. The curvature in all directions provides multidimensional structural support, enabling larger diameters while maintaining pressure resistance through the geometric efficiency of the spherical form.
3Productivity
If conventional injection stretch blow molding is used to maintain production efficiency, then manufacturing speed is high, but the vessel volume and pressure resistance are restricted by process limitations
Solution Approach 1:
The patent segments the manufacturing process into two distinct stages: first, producing spherical preforms using injection molding, and second, separately forming the final large-volume vessels using these preforms as molds. This segmentation allows the high-speed injection molding process to produce the basic spherical shape and structural framework, while the subsequent forming process can create the final large-volume configuration without being constrained by the speed limitations of traditional stretch blow molding. The preforms serve as reusable molds that can be heated and filled multiple times, maintaining productivity while enabling larger vessel volumes.
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 system enables a significant increase in vessel volume and pressure resistance, while being more cost-effective and maintaining structural integrity under higher forces, with the spherical design and PET material providing enhanced strength and durability.
Implementation Method 1
The upper part of the vessel (10) has a spherical dome (12) which can withstand larger forces
Implementation Method 2
The lower end of the vessel has an open end, which is closed by a ring-shaped closure (15) which is connected to the vessel (10) by laser welding
Data Source
AI summary
A novel pressure control system provided for maintaining a constant predetermined excess pressure in a fluid dispensing container comprises a high-pressure plastic vessel having an inner chamber and an upper open end, and a pressure control device with a valve, which pressure control device is mounted on the upper open end of the high-pressure vessel, whereas a passageway is provided from the inner chamber to the outside, which is controlled by the valve, wherein the vessel is substantially cylindrical.The upper part of the vessel has a spherical dome with a cylindrical insert provided for receiving the pressure control device and the lower end of the vessel has an open end, which is closed by a ring-shaped closure.