Torque-Limited Tubing Fitting for Leak-Free Chromatography Connections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fluidic fittings for liquid chromatography systems are prone to leaks, require excessive time for connection and disconnection, and can be damaged by over-tightening, leading to inefficiencies and contamination risks, especially when dealing with biological samples.
Innovation Solution
A torque-limited fitting design featuring a head with external tapered portions and a body with internal abutments, allowing secure engagement without the need for additional tools, ensuring leak-proof connections and minimizing the risk of damage, while being reusable and biocompatible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fittings are tightened to ensure leak-proof connections, then connection reliability is improved, but the risk of over-tightening damage increases
Solution Approach 1:
The patent changes the mechanical parameter of torque limitation by incorporating a torque-limiting mechanism that physically prevents application of excessive torque. The mechanism includes a lever arm that deflects and disengages from the drive spline when torque exceeds a predetermined threshold, thereby protecting the fitting from over-tightening damage while ensuring adequate sealing force is applied during normal assembly
Solution Approach 2:
The torque-limiting mechanism provides beforehand protection by being designed with a predetermined torque threshold that prevents over-tightening before it can occur. The lever arm is positioned and dimensioned to deflect at a specific torque level, cushioning the system against excessive forces that would damage the fitting or tubing
2Manufacturing precision
If conventional fittings require additional tools for connection, then connection precision is improved, but operational complexity and time consumption increase
Solution Approach 1:
The fitting performs self-service by incorporating an integrated torque-limiting mechanism that automatically controls the tightening process without requiring external torque tools or specialized equipment. The lever arm self-deflects when torque reaches the predetermined threshold, providing self-regulating connection control that simplifies operation while maintaining precision
Solution Approach 2:
The patent extracts the torque-limiting function from external tools and integrates it directly into the fitting structure. By building the torque control mechanism into the fitting itself, the system eliminates the need for separate torque-wrench tools while preserving the precision benefits of controlled torque application
3Productivity
If conventional fittings are disconnected and reconnected multiple times, then component replacement efficiency is improved, but connection reliability deteriorates due to wear and damage
Solution Approach 1:
The torque-limiting mechanism provides beforehand protection during repeated connection cycles by preventing over-tightening damage each time the fitting is assembled. This protective feature ensures that the fitting and tubing maintain their structural integrity and sealing capability across multiple connect/disconnect operations, preserving reliability while enabling efficient component replacement
Data Source
AI summary
A torque limited fitting is provided having a head and a body, which in certain embodiments may be assembled by an operator. The body of the torque limited fitting has a passageway therethrough for receiving and removably holding tubing. The torque limited fitting may be adapted for use with a flat bottom port, such as in an analytical instrument, like liquid chromatography, gas chromatography, ion chromatography, or in in vitro diagnostic systems.