Capillary Bridge Viscometer Balancing Mechanism
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Solution Overview
Problem
Traditional capillary viscometers require inconvenient and often inaccurate adjustments to maintain balance, especially when switching between different solvents or analytical column sets, which can lead to decreased instrument performance and the need for costly reassembly or manufacturer intervention.
Innovation Solution
A mechanical balancing unit with a Nitinol rod and actuating mechanism allows for precise adjustments to the capillary flow resistance, enabling automatic or semi-automatic rebalancing of the viscometer bridge by moving the rod within a conduit, effectively adding or subtracting resistance to maintain balance without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional capillary viscometers use fixed-length capillary tubing, then the bridge balance can be initially set, but the instrument becomes inconvenient to adjust when switching between different solvents or analytical column sets, requiring disassembly and reassembly by skilled technicians
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed-length capillary tubing with an adjustable capillary length mechanism. The capillary tubing can be extended or trimmed to different lengths to compensate for changes in flow resistance when switching between different solvents or analytical column sets. This dynamic adjustment capability allows the bridge to be rebalanced without disassembly, directly resolving the contradiction between ease of operation and device complexity.
2Reliability
If the capillary tubing length is adjusted to compensate for delay volume changes, then bridge balance can be restored, but the instrument requires disassembly and reassembly, increasing maintenance complexity and cost
Solution Approach 1:
The adjustable capillary length mechanism enables dynamic modification of the capillary tubing length to restore bridge balance after changing delay volumes. The mechanism includes features such as a movable capillary end, a capillary holder, and a trimming tool that allow in-situ adjustment without disassembly, directly addressing the ease of repair concern while maintaining reliability.
Solution Approach 2:
The patent implements self-service by providing a user-friendly adjustment mechanism that allows end-users to perform bridge balancing themselves without requiring skilled technicians or manufacturer intervention. The adjustable capillary length mechanism includes all necessary components (capillary holder, trimming tool, reference marks) integrated into the instrument, enabling users to independently restore bridge balance by simply adjusting or trimming the capillary tubing.
3Adaptability or versatility
If multiple delay volumes are shipped with the instrument to meet different customer needs, then adaptability is improved, but the complexity of maintaining bridge balance across different configurations increases
Solution Approach 1:
The patent applies parameter changes by allowing continuous adjustment of the capillary tubing length to compensate for different delay volume configurations. Instead of requiring precise pre-calculation and pre-setting of fixed capillary lengths for each delay volume, the adjustable mechanism enables users to simply modify the capillary length parameter to achieve the desired bridge balance, greatly simplifying the reconfiguration process while maintaining adaptability to different customer needs.
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
This solution allows for precise and efficient balancing of the viscometer, enabling in-situ adjustments that improve instrument performance and reduce the need for costly servicing, while avoiding thermal complications associated with temperature-based methods.
Implementation Method 1
A mechanical balancing unit with a Nitinol rod and actuating mechanism allows for precise adjustments to the capillary flow resistance
Data Source
AI summary
Viscometers and Viscometry methods are disclosed. In one general aspect a capillary bridge viscometer comprises an input port an output port a first capillary tubing arm in a first hydraulic path between the input port and a first differential detection point, a second capillary tubing arm in a second hydraulic path between the first differential detection point and the output port, a third capillary tubing arm in a third hydraulic path between the input port and a second differential detection point, a fourth capillary tubing arm in a fourth hydraulic path between the second differential detection point and the output port, an adjustable mechanical flow restrictor in one of the first, second, third, and fourth hydraulic paths, wherein the adjustable mechanical flow restrictor is operative to mechanically adjust a resistance to flow of a fluid while the fluid flows through the adjustable mechanical flow restrictor.