Pipe Connection Joint for Liquid Chromatography
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Solution Overview
Problem
Conventional pipe connection joints for liquid chromatography fail to securely hold pipes under high pressures, leading to low operation efficiency and accuracy due to variations in pressing force and pipe insertion depths, and are prone to damage when reused across different analysis columns.
Innovation Solution
A pipe connection joint design featuring a ferrule with a wedge-shaped end, a compression screw with varying diameters, and elastic body supports that allow the pipe to move axially, reducing dead volume and enabling secure attachment to different analysis columns without applying pressure directly, thus enhancing accuracy and allowing for multiple uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the operator manually adjusts the compression screw to reduce dead volume, then analysis accuracy is improved, but operation efficiency decreases due to requiring both hands and varying pressing forces
Solution Approach 1:
The pipe clamp holder enables the pipe clamp to automatically adjust and maintain optimal positioning through the elastic body's restoring force. The system self-regulates the pressing force on the pipe without requiring manual adjustment, eliminating operator variability while maintaining low dead volume.
Solution Approach 2:
The elastic body changes its compression parameter dynamically based on the pipe's position and the compression screw's movement. This automatic parameter adjustment ensures consistent pressing force without manual intervention, improving both accuracy and efficiency.
2Reliability
If a pipe clamp is added to forcibly hold the pipe, then pipe holding reliability is improved, but the pipe clamp may bite and scratch the pipe under high pressure
Solution Approach 1:
The pipe clamp is designed with a flexible structure that distributes pressure evenly around the pipe. This flexibility prevents localized stress concentration that would cause biting and scratching, while still maintaining sufficient friction for reliable holding.
Solution Approach 2:
The pressing force of the pipe clamp is dynamically controlled through the elastic body's properties. The force is sufficient to prevent pipe slippage but limited to avoid damage, optimizing the balance between holding reliability and pipe protection.
3Adaptability or versatility
If the pipe insertion depth varies among different analysis columns, then adaptability is improved, but dead volume increases due to inconsistent pressing forces
Solution Approach 1:
The pipe clamp holder and elastic body create a dynamic adjustment mechanism that automatically adapts to different pipe insertion depths. The elastic body's compression distance varies with pipe position, maintaining consistent pressing force and low dead volume across different analysis columns without manual intervention.
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
The design improves analysis accuracy and allows for repeated use across various analysis columns, reducing the risk of pipe damage and maintaining high-pressure sealing, thereby enhancing operational efficiency and reducing turnaround time for method development.
Implementation Method 1
an elastic body 206...supports the pipe 209 in such a way that the pipe 209 is movable
Implementation Method 2
one end portion in a wedge shape...a compression screw that has a first inner hole having a first diameter (x1) into which the pipe is inserted
Data Source
AI summary
A pipe connection joint which is repeatedly usable when an analysis column is replaced with another in a liquid chromatographic device. To this end, an elastic body is built into a compression screw for inserting a pipe passed through a ferrule into the analysis column to thereby axially movably support the pipe, and a pipe clamp is secured in advance at a predetermined position of the pipe. A distance between the ferrule and the pipe clamp changes on the basis of the length of a portion of the pipe sticking out from the ferrule and the pressing force of the elastic body applied to the pipe.