Sample Chamber Valve Mechanism for Laser Ablation ICP-MS
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Solution Overview
Problem
Existing laser-assisted spectroscopy systems face inefficiencies and errors due to manual processes required for gas bypass, purging, and flow restoration when opening and closing sample chambers, which increase complexity, maintenance costs, and the risk of contamination.
Innovation Solution
An improved sample chamber design that automatically redirects fluid flow using a sample drawer with multiple positions and valves to maintain inert gas flow, preventing room atmosphere from entering, and automatically switching between bypass, purge, and restore modes as the sample chamber is opened and closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual processes are used for gas bypass, purging, and flow restoration when opening and closing sample chambers, then system complexity and maintenance costs increase, but automation and operational simplicity are reduced
Solution Approach 1:
The patent combines multiple manual operations (gas bypass, purging, and flow restoration) into a single automated sequence triggered by the sample chamber door position. The system merges these distinct functions into one integrated control mechanism that automatically manages fluid flow based on chamber state, thereby reducing operational complexity while increasing automation.
Solution Approach 2:
The system performs self-service by automatically detecting when the sample chamber door is opened or closed and autonomously executing the appropriate fluid flow management sequence. The controller monitors door position and independently initiates bypass, purging, and restoration operations without requiring manual intervention, allowing the system to manage itself during sample chamber access.
2Ease of operation
If manual processes are used for gas bypass, purging, and flow restoration, then operational simplicity is maintained, but the risk of contamination and errors increases
Solution Approach 1:
The system employs feedback by continuously monitoring the sample chamber door position through a door position sensor and using this information to automatically control fluid flow management. The controller receives real-time feedback on chamber state and adjusts the bypass and purging operations accordingly, ensuring that inert gas flow is maintained during door opening/closing to prevent contamination while eliminating manual errors.
Solution Approach 2:
The system performs preliminary action by initiating purging operations before the sample chamber is fully opened and maintaining bypass flow during the entire door operation sequence. This proactive approach ensures that the chamber is pre-purged of air before sample insertion and that continuous inert gas flow prevents contamination during the vulnerable transition period, thereby reducing contamination risk before it can occur.
3Adaptability or versatility
If the sample chamber is opened to introduce new samples, then sample replacement is enabled, but room atmosphere may enter and extinguish the plasma torch
Solution Approach 1:
The system uses an intermediary approach by introducing a bypass channel that allows inert gas to flow around the sample chamber during door opening, and a purging channel that actively removes air from the chamber. These intermediary flow paths act as buffers between the sample chamber interior and the external environment, preventing direct contact between room atmosphere and the plasma torch while still allowing sample replacement.
Solution Approach 2:
The system maintains an inert atmosphere throughout the sample chamber during door opening and closing operations by continuously flowing inert gas through the chamber via the bypass and purging channels. This creates a protective inert environment that prevents air from entering the chamber and extinguishing the plasma torch, while still permitting sample insertion and removal through the open door.
4Reliability
If purging is performed to prevent air contamination, then contamination risk is reduced, but system throughput and efficiency decrease due to additional time required
Solution Approach 1:
The system maintains continuity of useful action by keeping the inert gas flow continuous throughout the entire door opening and closing sequence through the bypass channel. Rather than interrupting the gas flow during purging operations, the system ensures uninterrupted inert atmosphere protection while simultaneously performing purging, thereby maintaining both contamination prevention and system efficiency without idle time between operations.
Data Source
AI summary
An improved sample chamber for laser assisted spectroscopy integrates valve mechanisms into the sample drawer, permitting the sample chamber to automatically bypass, purge and resume flow as the sample drawer is opened and closed to insert samples for processing. Integrating valve mechanisms into the sample drawer in this manner eliminates the need for external valves to be operated to bypass, purge and resume flow, thereby increasing system throughput and reducing system complexity.