High Pressure Fluidic Connection Assembly with Tapered Locktube
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Solution Overview
Problem
Conventional fluidic connections in high-pressure and ultra-high-pressure liquid chromatography systems are prone to leaks, require high torque for assembly and disassembly, and are not biocompatible, leading to inefficiencies and contamination issues, especially when handling biological samples.
Innovation Solution
The development of a fluidic connection assembly comprising a nut, locktube, and ferrule with tapered portions and a washer, which allows for secure, leak-proof connections at high pressures without the need for tools, using biocompatible materials like PEEK, and enabling quick and repeated disconnection and reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluidic connections are used in high-pressure liquid chromatography systems, then the connections can be made with standard components, but the connections are prone to leaks and require high torque for assembly and disassembly
Solution Approach 1:
The connection assembly uses a dynamic locking mechanism where the locktube engages with the ferrule through tapered portions that create a self-locking effect under pressure. The ferrule's external tapered portion interfaces with the locktube's internal tapered portion, allowing the connection to automatically tighten and seal when fluid pressure is applied, eliminating leaks without requiring high assembly torque.
Solution Approach 2:
The design changes the geometric parameters of the connection components, specifically using tapered portions with specific angle ranges (ferrule taper: 2°-11°, locktube taper: 3°-12°) to optimize both the sealing performance and the ease of assembly. These parameter optimizations allow the connection to achieve leak-proof sealing at low torque while maintaining reliability under high pressure.
2Object-affected harmful factors
If conventional connections are used, then standard materials can be employed, but they are not biocompatible and cause contamination when handling biological samples
Solution Approach 1:
The connection assembly uses composite material construction where the ferrule and locktube are made from biocompatible materials such as PEEK (polyetheretherketone) or other biologically inert materials. This material selection ensures compatibility with biological samples and prevents contamination, while the manufacturing processes for these materials are well-established in the aerospace and medical device industries, maintaining ease of manufacture.
3Reliability
If high torque is used for assembly, then secure connections can be achieved, but tool requirement increases and repeated disconnection becomes difficult
Solution Approach 1:
The connection assembly employs a self-locking mechanism where the tapered portions of the ferrule and locktube create automatic engagement and sealing when fluid pressure is applied. The design allows hand-tightening to suffice, as the system self-adjusts and secures itself under operating conditions, eliminating the need for external tools and enabling easy repeated disconnection and reconnection.
4Productivity
If conventional connections are used, then standard design can be applied, but they require high torque and are not suitable for repeated disconnection and reconnection
Solution Approach 1:
The dynamic tapered interface between the ferrule and locktube allows the connection to be easily assembled and disassembled by hand, enabling rapid repeated connections. The same tapered geometry ensures that each reconnection achieves full sealing and security, maintaining reliability across multiple connection cycles without degradation.
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 solution provides reliable, leak-proof connections that withstand pressures up to 18,000 psi, are reusable multiple times, and are biocompatible, reducing contamination risks and operational inefficiencies in liquid chromatography systems.
Implementation Method 1
a ferrule having a first end, a second end, a passageway therethrough, and an external tapered portion, wherein the external tapered portion of the ferrule is adapted to securely engage with the internal tapered portion of the locktube
Data Source
AI summary
Fluidic connection assemblies, ports, unions and other components are provided that are well-suited for use in HPLC and UHPLC, as well as in other analytical instrument systems. Such assemblies, ports, unions and components can be biocompatible.