Cryogenic Storage Control With Purge-Assisted Fill-Level Validation
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Solution Overview
Problem
Cryogenic storage devices face issues with inaccurate fill level measurements due to clogging in differential pressure systems, lack of visibility for retrieving stored items, and cumbersome calibration processes, especially at low temperatures, which affect the reliability and efficiency of cryogenic storage containers.
Innovation Solution
A dual fill level measurement system combining differential pressure and thermistor arrays within the cryogenic storage container, along with a lighting assembly for easy maintenance, automated purge processes, and programmable control systems for improved operation and user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential pressure measurement system is used to determine fill level, then the measurement is non-contact and simple to implement, but the system becomes clogged during operation due to condensation from moisture introduction
Solution Approach 1:
The patent introduces a purge gas flow as an intermediary substance to prevent condensation in the differential pressure measurement system. The purge gas flows through the measurement system to displace moisture and prevent condensation that would cause clogging, thereby maintaining measurement reliability without sacrificing the non-contact measurement advantage
Solution Approach 2:
The patent extracts and removes moisture from the differential pressure measurement system by introducing a purge gas flow that carries moisture out of the system. This extraction of the harmful substance (moisture) prevents condensation and maintains system reliability
2Illumination intensity
If lighting arrangements are installed within the interior volume of the cryogenic storage container, then visibility for retrieval of stored items is improved, but the lighting elements become difficult to access and service at low temperatures
Solution Approach 1:
The lighting system is segmented into modular components that can be independently accessed and replaced. The lighting elements are positioned and configured so that specific portions can be serviced without requiring access to the entire interior volume, making maintenance feasible at cryogenic temperatures
Solution Approach 2:
The lighting elements are designed to be pre-positioned and pre-configured for easy access during maintenance. The system anticipates the need for servicing and designs the lighting arrangement so that replacement can be performed efficiently before critical failures occur, reducing the complexity of cold-temperature repairs
3Measurement precision
If a lengthy calibration process involving dipstick and depressurized/pressurized procedures is used, then accurate fill level information is obtained, but significant delay occurs between installation and availability for use
Solution Approach 1:
The system performs preliminary calibration actions during manufacturing or initial setup, pre-configuring the differential pressure measurement system with reference data. This preliminary calibration reduces the on-site calibration time required, allowing the system to become operational faster while maintaining accuracy
Solution Approach 2:
The system uses feedback from the dual measurement arrangement (differential pressure and thermistor array) to self-correct and validate calibration data. This feedback mechanism allows for faster calibration by continuously comparing measurements and adjusting parameters in real-time, reducing the need for lengthy manual calibration procedures
4Reliability
If a dual fill level measurement arrangement is used comparing differential pressure and thermistor array readings, then measurement reliability is improved through validation, but system complexity increases
Solution Approach 1:
The patent merges two different measurement approaches (differential pressure and thermistor array) into a unified validation system. By combining these measurements and comparing results, the system achieves higher reliability through cross-validation, while the integrated design manages the complexity through a single control framework
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
Ensures accurate and reliable fill level monitoring, reduces maintenance complexity, and enhances user experience by providing easy access to lighting and automated processes, ensuring consistent performance and operational efficiency.
Implementation Method 1
obtain, via the differential pressure system, a pressure at a top of the interior volume and a pressure proximate to a bottom of the interior volume
Implementation Method 2
obtain, via the thermistor array, a resistance of each thermistor indicative of a temperature at each of the predetermined depths
Data Source
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AI summary
A cryogenic storage control system and storage device assembly are provided. The cryogenic storage control system may utilize a dual fill level measurement arrangement in which a differential pressure-based fill level determination is compared to a fill level determined from an array of thermistors positioned at varying depths within the cryogenic storage container. Significant disagreement between fill level determinations may result in an alert being generated by a control system. Additionally, various operational processes may be implemented to ensure proper operation including calibration processes, monitoring processes, and maintenance processes.