Hydraulic Fitting Element for HPLC Tubing Sealing
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Solution Overview
Problem
High performance liquid chromatography (HPLC) systems face challenges in maintaining fluid-tight seals and preventing leakage at high pressures, leading to potential contamination and inefficient separation due to mechanical solutions that concentrate force on small areas, causing damage and poor sealing performance.
Innovation Solution
A fitting element utilizing a hydraulic element that transforms axial force into hydraulic pressure, providing a grip force through isotropic or anisotropic pressure distribution, allowing for a more even and adjustable sealing mechanism that reduces contact pressure and enhances sealing efficacy at high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mechanical solutions are used to provide grip force, then the structure is simple, but the contact pressure is concentrated on small areas causing damage and poor sealing performance
Solution Approach 1:
The patent applies hydraulic principles by introducing a hydraulic element that converts axial compression force into radial grip force through hydraulic pressure. This hydraulic mechanism distributes the gripping force uniformly across the contact surface, preventing localized stress concentration and improving sealing performance while maintaining structural simplicity.
Solution Approach 2:
The patent changes the physical state and distribution parameters of the gripping force by using hydraulic pressure to transform concentrated axial force into distributed radial force. This parameter transformation allows the system to achieve reliable sealing without increasing structural complexity.
2Ease of manufacture
If mechanical solutions are used to provide grip force, then the device is easy to manufacture, but leakage occurs at high pressures
Solution Approach 1:
The hydraulic element transforms axial compression into radial grip force through hydraulic pressure, which naturally distributes the force uniformly. This hydraulic approach prevents leakage at high pressures while maintaining ease of manufacture, as the hydraulic element can be integrated into existing ferrule designs without complex manufacturing processes.
Solution Approach 2:
The hydraulic element acts as an intermediary between the compression force and the gripping action. It mediates the force transmission by converting axial compression into radial grip through hydraulic pressure, ensuring reliable sealing at high pressures while keeping the overall device simple to manufacture.
3Force
If axial force is applied directly to the tubing, then the sealing force is sufficient, but the force distribution is uneven causing damage
Solution Approach 1:
The hydraulic element converts concentrated axial compression force into distributed radial grip force through hydraulic pressure. This transformation maintains sufficient sealing force while distributing it uniformly across the tubing contact surface, preventing damage to the tubing.
Solution Approach 2:
The patent changes the force distribution parameter from concentrated axial force to distributed radial force through hydraulic pressure. This parameter change ensures that the sealing force remains sufficient while the force distribution becomes uniform, protecting tubing integrity.
4Reliability
If high contact pressure is used to ensure sealing, then the seal is effective, but the contact surface area is small causing localized damage
Solution Approach 1:
The hydraulic element distributes the gripping force uniformly across a larger contact surface area through hydraulic pressure. This allows the system to maintain effective sealing without relying on high contact pressure concentrated on a small area, thereby preventing localized damage.
Solution Approach 2:
The patent changes the contact pressure parameter by distributing the force over a larger surface area through hydraulic pressure. This parameter change maintains sealing efficacy while reducing the contact pressure intensity, preventing localized damage to the tubing.
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 hydraulic-based fitting element ensures a consistent and increased grip force along the contact surface, reducing the risk of leakage and damage while maintaining a fluid-tight seal, even at high pressures, thus improving the reliability and efficiency of HPLC systems.
Implementation Method 1
a hydraulic element configured to transform an axial force into a hydraulic pressure within the hydraulic element
Implementation Method 2
The hydraulic pressure in the hydraulic element then causes the grip force
Data Source
AI summary
A fitting element, in particular for an HPLC application, is configured for providing a fluidic coupling of a tubing to a fluidic device. The fitting element comprises a gripping piece to exert—upon coupling of the tubing to the fluidic device—a grip force (G) between the fitting element and the tubing. The gripping piece comprises a hydraulic element configured to transform an axial force (S) into a hydraulic pressure (P) within the hydraulic element. The hydraulic pressure (P) in the hydraulic element causes the grip force (G).