Self-releasing ferrule fitting for high-pressure chromatography
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Solution Overview
Problem
Conventional liquid chromatography systems face inefficiencies due to time-consuming and labor-intensive connections and disconnections of components, particularly in high-pressure and ultra-high pressure applications, which can lead to leakage and contamination issues, especially when handling biological samples where stainless steel components are not suitable.
Innovation Solution
A fitting assembly with a self-releasing ferrule design that allows for quick and leak-free connections and disconnections, capable of withstanding pressures up to 10,000 psi, using biocompatible materials to prevent contamination and deformation of tubing, and enabling easy replacement of components without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional connection methods are used in high-pressure liquid chromatography systems, then connections can withstand high pressure, but component replacement is time-consuming and labor-intensive
Solution Approach 1:
The fitting assembly is divided into distinct modular components: a body portion with internal threading, a separate ferrule with external threading, and a tubing interface. This segmentation allows the ferrule to be independently manipulated and quickly attached or detached from the body, enabling rapid component replacement without complex disassembly procedures while maintaining high-pressure integrity through the threaded connection mechanism.
2Reliability
If conventional ferrules are used, then connections can be made, but leakage and contamination issues occur
Solution Approach 1:
The ferrule is designed with self-tightening capability through its external threading that automatically engages with the internal threading of the body portion when torque is applied. This self-service mechanism ensures consistent, leak-free connections without requiring additional sealing components or complex assembly procedures, thereby preventing leakage and contamination while maintaining system reliability.
3Strength
If stainless steel components are used, then structural strength is sufficient, but biological samples are contaminated
Solution Approach 1:
The fitting assembly employs different materials for different functional regions: the body portion can be made from biocompatible materials (such as PEEK or other polymers) that prevent sample contamination, while the ferrule maintains structural strength through its threading design and material selection. This local differentiation allows each component to optimize for its specific function - the body for chemical inertness and the ferrule for mechanical connection strength.
4Ease of operation
If quick-release mechanisms are implemented, then component replacement is fast, but connection reliability under high pressure decreases
Solution Approach 1:
The ferrule incorporates a dynamic locking mechanism where the external threading allows rotational movement during assembly and disassembly, enabling quick operation. Once engaged, the threaded connection creates a static, rigid joint that maintains connection stability under high pressure. The dynamic ease of operation during installation transitions to static reliability during pressurized operation.
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 significantly reduces the time and effort required for component changes, minimizes the risk of leakage and contamination, and maintains the integrity of biological samples by providing a reliable, reusable, and biocompatible connection system for high-pressure liquid chromatography systems.
Implementation Method 1
a nut having a first end and a second end and a passageway therethrough, a nut head proximal to the first end of the nut, a first non-tapered portion, an externally threaded portion, a second non-tapered portion, a lip, and a tapered portion proximal to the second end of the nut
Implementation Method 2
a ferrule having a first end, a lip proximal to the first end of the ferrule, a plurality of external tapered portions, a second end, and having a passageway therethrough, wherein the passageway of the ferrule comprises a plurality of internal tapered portions
Implementation Method 3
wherein the lip of the ferrule is adapted to securely engage with the lip of the nut
Implementation Method 4
capable of withstanding pressures up to 10,000 psi
Data Source
AI summary
A fitting assembly is provided having a nut and a self-releasing ferrule, which in certain embodiments may be assembled by an operator. The nut and ferrule of the fitting assembly have passageways therethrough for receiving and removably holding tubing.