Threaded GC Vaporization Chamber Insert Without O-Ring Melting
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Solution Overview
Problem
Conventional sample vaporization chambers face issues with insert contamination due to non-vaporization of sample residues in cooler regions and difficulty in replacing the insert without an O-ring, which leads to frequent replacements.
Innovation Solution
A sample vaporization chamber design with a threaded insert and insert fixing portion allows for easy attachment and detachment of the insert within the heating section by threading, eliminating the need for an O-ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an O-ring is attached to the insert to fix it in position, then the insert is secured in place and sample gas is prevented from flowing outward, but the O-ring melts due to heater heating during analysis
Solution Approach 1:
The patent removes the O-ring component from the insert fixation system. Instead of using an O-ring to seal and fix the insert, the invention uses a threaded connection structure where the insert has external threads that screw into internal threads of the chamber body, eliminating the rubber component that would melt under heater exposure.
Solution Approach 2:
The patent replaces the elastomeric sealing mechanism (O-ring compression seal) with a mechanical threading system. The fixation is achieved through screw threads that provide both positioning and sealing through metal-to-metal contact, substituting the thermal-sensitive rubber component with a thermally stable mechanical fastening system.
2Object-affected harmful factors
If the insert is placed in a cool region outside the heating section, then the O-ring is protected from melting, but sample adhering to the insert is not vaporized causing contamination
Solution Approach 1:
By removing the O-ring entirely, the patent eliminates the need to compromise insert positioning to protect the O-ring. The insert can be fully positioned within the heating section without risking damage to sealing components, ensuring complete vaporization of sample residues.
Solution Approach 2:
The patent changes the thermal parameter exposure of the insert by eliminating thermal-sensitive components. Without an O-ring to protect, the insert operates fully within the high-temperature zone, transforming the thermal environment from a compromised state to an optimized vaporization state.
3Temperature
If the insert is fixed using a metal spring without an O-ring, then the entire insert can be accommodated within the heating section, but it becomes difficult to detach the insert for replacement
Solution Approach 1:
The patent replaces the spring-based mechanical retention system with a threaded fastening system. While both provide secure fixation, the threaded connection offers superior ease of operation for replacement, as screws can be quickly unscrewed and removed compared to compressing and releasing spring mechanisms.
Solution Approach 2:
The threaded connection provides uniform mechanical engagement along the threaded interface, distributing the fixation force evenly. This homogeneous stress distribution maintains secure positioning during analysis while allowing controlled, uniform disengagement during replacement.
4Measurement precision
If the insert is frequently replaced due to contamination, then the system maintains analytical accuracy, but the productivity and efficiency of the gas chromatograph decreases
Solution Approach 1:
The patent addresses the frequent replacement issue by implementing design changes that extend insert service life. The threaded fixation system and complete heating zone coverage prevent contamination, allowing the insert to serve longer without degradation, reducing the frequency of replacements while maintaining analytical performance.
Solution Approach 2:
The insert design with threaded fixation and complete heating zone exposure creates a self-maintaining system where sample residues are continuously vaporized and removed, preventing accumulation and contamination. This self-cleaning effect through thermal exposure extends the operational life of the insert without requiring frequent manual interventions.
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 ensures complete vaporization of sample residues, reduces insert contamination, and simplifies maintenance by facilitating easy insert replacement.
Implementation Method 1
heat a sample with the heater to vaporize the sample to produce a sample gas
Implementation Method 2
a first threaded portion provided on the inner peripheral surface or the outer peripheral surface of at least a lower end side of the insert; and an insert fixing portion having a second threaded portion to be threaded with the first threaded portion
Data Source
AI summary
A sample vaporization chamber for gas chromatograph includes a cylindrical insert provided, at least on a lower end side of an inner peripheral surface or an outer peripheral surface thereof, with a first threaded portion, and an insert fixing portion provided with a second threaded portion to be threaded with the first threaded portion in the inner space of the housing. The insert fixing portion is configured to fix the insert in the inner space of the housing in a state in which the insert is accommodated in the inner space by threading the first threaded portion of the insert inserted in the inner space through the opening with the second threaded portion.