Modular Capillary Bridge Viscometer for Rapid Balance Adjustment
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Solution Overview
Problem
Traditional capillary viscometers require inconvenient and often inaccurate adjustments to balance the bridge configuration due to changes in solvent or column sets, leading to decreased performance and potential instrument damage from improper connections.
Innovation Solution
A modular capillary bridge viscometer design featuring a bulkhead supporting structure with removable connection portions and a bridge module that can be quickly swapped, eliminating the need for disassembly and allowing for precise hydraulic connections without risk of over-tightening or dead volume creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional permanent connections with nuts and ferrules are used to assemble capillary tubing, then the connection appears secure, but the tubing can be over-tightened causing leaks or become stuck ruining the tubing, and improper installation creates dead volume increasing band broadening
Solution Approach 1:
The connection system is segmented into modular components: a bulkhead with integrated ports, removable bridge modules, and standardized connectors. This segmentation allows the bridge module to be easily detached and replaced without permanent connections, eliminating over-tightening risks while maintaining secure hydraulic connections through precision-machined interfaces.
Solution Approach 2:
The bridge module is designed as a replaceable unit that can be quickly swapped out. While not disposable in the literal sense, the modular design treats the bridge module as a consumable component that can be easily replaced rather than repaired, reducing the consequences of installation errors and eliminating the need for complex permanent connections that risk damage.
2Measurement precision
If capillary tubing length is adjusted to balance the viscometer bridge, then bridge balance can be achieved, but the instrument requires disassembly and reassembly by skilled technicians, increasing downtime and potential for error
Solution Approach 1:
The system transitions from static permanent connections to dynamic removable connections. The bridge module can be quickly removed and replaced with different pre-configured modules, allowing rapid adjustment of capillary lengths and delay volumes without manual disassembly or specialized tools, thereby maintaining bridge balance while dramatically improving ease of operation.
Solution Approach 2:
Different bridge modules are pre-configured with specific capillary lengths and delay volumes appropriate for various solvent systems and column sets. Users simply select and install the pre-configured module needed for their application, eliminating the need for on-site adjustments and skilled technical intervention while ensuring optimal bridge balance for each configuration.
3Adaptability or versatility
If multiple delay volumes of different sizes are provided to meet specific customer needs, then adaptability to different column sets is improved, but device complexity and inventory requirements increase
Solution Approach 1:
The bulkhead and bridge module interface is designed with universal, standardized connections that work across all configurations. A single bulkhead can accommodate multiple different bridge modules through standardized ports, allowing one universal base unit to support multiple functions and applications by simply swapping the bridge module, thereby reducing overall system complexity while maintaining high adaptability.
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
Enables rapid and accurate balancing of the viscometer bridge for different applications, reducing instrument downtime and improving performance by allowing easy exchange of bridge modules with varying lengths and diameters, thus minimizing the impact of solvent changes and eliminating installation errors.
Implementation Method 1
R1, R2, R3, and R4 are capillary tubes of a small diameter giving them a measurable resistance to the solvent flow
Implementation Method 2
the differential pressure (DP) output should theoretically be zero... DP+ and DP− readings measured in Pascals
Data Source
AI summary
A capillary bridge viscometer (120), comprises at least two at least generally balanced bridge arm conduits (R1, R2) a bulkhead supporting structure (122,134) supporting removable connection portions for each of a plurality of the arms in a bridge configuration, a bridge supporting structure (124,136) supporting the bridge arm conduits (R1,R2) and supporting two further removable connection portions (132) for each of the bridge arm conduits, wherein each of the further removable connection portions (132) supported by the bridge supporting structure are positioned to mate with a corresponding one of the removable connection portions (130) supported by the bulkhead supporting structure concurrently to hydraulically connect the bridge arm conduits in the bridge configuration; and a balance detector having hydraulic connections for connection between first and second differential detection points in the bridge when the removable connection portions on the bridge are mated to corresponding ones of the removable connection portions supported by the bulkhead supporting structure.