Isolation Valve Assembly for Fast Mass Spectrometer Interlock Evacuation
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Solution Overview
Problem
Mass spectrometers face damage to high vacuum pumps due to exposure to large pressure differentials during the evacuation of vacuum interlocks, and conventional systems prolong evacuation cycles with additional volumes or flow restrictors, increasing pumping time.
Innovation Solution
An isolation valve assembly with a piston mechanism that isolates and reconnects high and low vacuum pumps during interlock evacuation, using high-conductance pathways and a control valve to manage pressure differentials, ensuring rapid pumping without damaging the high vacuum pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vacuum interlock is evacuated using conventional systems with additional volumes or flow restrictors, then the high vacuum pump is protected from pressure surges, but the evacuation cycle time increases
Solution Approach 1:
The vacuum system is segmented into distinct regions (vacuum interlock, high vacuum region, low vacuum region) with selective isolation capabilities. The isolation valve assembly allows the vacuum interlock to be evacuated separately through the low vacuum pump without requiring additional protective volumes, thus reducing evacuation time while protecting the high vacuum pump through regional isolation.
Solution Approach 2:
The isolation valve assembly acts as an intermediary mechanism between the vacuum interlock and the high vacuum region. It selectively connects or isolates these regions, enabling the vacuum interlock to be evacuated rapidly through the low vacuum pump while preventing pressure surges from reaching the high vacuum pump, eliminating the need for time-consuming additional protective volumes.
2Productivity
If the vacuum interlock is evacuated rapidly without isolation mechanisms, then the evacuation cycle time is reduced, but the high vacuum pump is exposed to damaging pressure differentials
Solution Approach 1:
The isolation valve assembly provides dynamic control over the vacuum system configuration. The piston can be positioned to selectively isolate the high vacuum region from the vacuum interlock during rapid evacuation, or to connect them when gradual pressure equalization is needed, allowing the system to adapt to different operational requirements and protect against pressure differential damage while maintaining high evacuation speeds.
Solution Approach 2:
The isolation valve assembly serves as a protective intermediary that can be positioned to block pressure surges from reaching the high vacuum pump. This allows the vacuum interlock to be evacuated rapidly through the low vacuum pump without exposing the high vacuum pump to damaging pressure differentials, achieving both high productivity and protection.
3Reliability
If additional volumes are added to protect the high vacuum pump, then the pump is protected from pressure surges, but the total evacuation volume increases and pumping time is extended
Solution Approach 1:
The system is divided into separable vacuum regions that can be evacuated independently. The vacuum interlock can be evacuated through the low vacuum pump without requiring additional protective volumes, as the isolation valve assembly prevents pressure surges from affecting the high vacuum region. This eliminates the need to evacuate extra protective volumes, reducing total evacuation time.
Solution Approach 2:
The isolation valve assembly acts as an intermediary that eliminates the need for additional protective volumes. By selectively isolating the high vacuum region, it allows rapid evacuation of the vacuum interlock without requiring time-consuming evacuation of additional protective volumes, thus reducing the total evacuation volume and time while maintaining pump protection.
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 isolation valve assembly protects the high vacuum pump from pressure surges and reduces evacuation time by efficiently managing pressure transitions, enhancing the operational safety and efficiency of mass spectrometers.
Implementation Method 1
Exposure to large pressure differentials can lead to damage of the high vacuum pumps. In addition, when evacuating a mass spectrometer vacuum interlock, the vacuum system is exposed to pressures that can create large pressure differentials.
Data Source
AI summary
A vacuum system for a mass spectrometer includes a first vacuum region, a second vacuum region, a vacuum interlock fluidly connected to the vacuum chamber by a first valve, a first pump fluidly connected to the first and second vacuum regions, a second pump fluidly connected to the second vacuum region, and a second valve. The second valve includes a housing, a piston movable within the housing between an evacuation position and an operation position, a first channel connected to a third valve, a second channel connected to the vacuum interlock, a third channel connected to the first pump, and a fourth channel connected to the second vacuum region. In response to the third valve adjusting to a first position, the piston moves to the evacuation position. In response to the third valve adjusting to the second position, the piston moved to the opened position.