Cryogenic Dewar Sealing Ring With Twist-Lock Leak Control
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Solution Overview
Problem
Existing liquid withdrawal devices for cryogenic storage dewars face issues with seal effectiveness, stress on the dewar mouth, and dependency on specific dewar geometry, leading to potential leaks and improper fitting.
Innovation Solution
A twist-and-lock liquid withdrawal device system featuring a sealing ring with alternating flanges and a head portion, which includes a spout assembly and valves, providing a secure and adaptable attachment to dewars of varying sizes and geometries through a sealing ring and head portion interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clamp-style mounting arrangement is used to attach the liquid withdrawal device to the dewar mouth, then the device can be securely attached, but significant stress is placed on the dewar mouth and the seal effectiveness is compromised
Solution Approach 1:
The mounting system is divided into separate components: a mounting ring that attaches to the dewar mouth and a head portion that connects to the ring. This segmentation distributes the attachment stress away from the dewar mouth, as the ring can be secured at multiple points around the circumference rather than concentrating force at a single clamp location.
Solution Approach 2:
The mounting ring acts as an intermediary component between the dewar mouth and the liquid withdrawal device head. This intermediate element absorbs and distributes the mechanical stress, protecting the dewar mouth from direct stress while maintaining secure attachment through the ring's flange structure.
2Strength
If a clamp-style mounting arrangement is used, then attachment is achieved, but the seal effectiveness is limited by the clamp seal quality
Solution Approach 1:
The sealing function is separated from the clamping function. The mounting ring provides structural attachment while a distinct seal component (O-ring or gasket) provides the sealing interface. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
A dedicated seal component serves as an intermediary between the mounting ring and the head portion, creating a reliable sealing interface that is independent of the clamp mechanism. This intermediary seal ensures consistent sealing performance regardless of variations in clamping force or alignment.
3Strength
If a clamp-style mounting arrangement is used, then attachment is achieved, but the system is highly dependent on the dewar mouth being within a known height and diameter range
Solution Approach 1:
The mounting ring is designed with a universal interface that can accommodate various dewar mouth sizes and geometries. The ring's flange structure with multiple attachment points allows it to adapt to different diameters, and the adjustable positioning enables compatibility across a range of height specifications, making the system universally applicable to different dewar types.
Solution Approach 2:
The mounting system incorporates dynamic adjustment capabilities, allowing the position and orientation of the head portion to be adjusted relative to the dewar mouth. This dynamic adaptability ensures proper alignment and secure attachment regardless of variations in dewar geometry, enhancing versatility across different container specifications.
Data Source
AI summary
Examples of the disclosure relate to a liquid withdrawal device useable in conjunction with a cryogenic dewar. A sealing ring may be coupled around an opening of the dewar, and includes a plurality of flanges forming recesses positioned to receive complementary flanges of a head portion of the liquid withdrawal device, forming a twist-and-lock interface.