Flexible Bellows Coupling for Vibrational Isolation in Analytical Systems
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Solution Overview
Problem
Combining mass spectrometry systems with high-resolution imaging systems like electron microscopes is challenging due to the need for vibrational isolation, as turbomolecular pumps generate vibrations that distort images, especially at nanometer-scale resolutions, and existing solutions are not compatible with multiple vibration frequencies or relative movement between systems.
Innovation Solution
A coupling system using a tubular connector with flexible portions, such as bellows, and radial seals to decouple vibrations between systems without metal-to-metal contact, allowing relative displacement and maintaining ion optical quality, while providing vacuum sealing and differential pumping to maintain ultra-high vacuum conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If turbomolecular pumps are used to provide vacuum for mass spectrometry systems, then vacuum pumping capability is improved, but vibration generation increases and distorts images in high-resolution imaging systems
Solution Approach 1:
The system is divided into separate vibration-isolated platforms for the imaging system and mass spectrometry system, with each platform independently supported by its own vibration isolation mechanism. This segmentation prevents vibration transmission between systems while maintaining各自的 vacuum requirements.
Solution Approach 2:
A flexible connector with bellows and radial seals acts as an intermediary between the two vacuum systems, providing both vacuum sealing and vibration decoupling. The flexible nature of the connector allows it to transmit vacuum pressure differential while blocking vibration transmission paths.
2Measurement precision
If active vibration isolation platforms are used to reduce vibrations, then image resolution is improved, but vertical displacement of the imaging system occurs when platforms are activated
Solution Approach 1:
The connector incorporates flexible bellows that can dynamically accommodate vertical displacement of the imaging system platform while maintaining vacuum sealing. The flexibility allows the system to adapt to platform movement without compromising the rigid alignment requirements of the ion optics.
Solution Approach 2:
The system allows for adjustment of the connector length and flexibility parameters to compensate for vertical displacement. By changing the physical parameters of the flexible connector, the system can maintain proper ion optical alignment despite platform movement.
3Productivity
If rigid connectors are used to maintain ion optical alignment, then ion transmission efficiency is improved, but vibration transmission increases and compromises imaging quality
Solution Approach 1:
The connector uses flexible bellows made of thin-walled material that maintains structural integrity for ion transmission while providing vibration isolation. The flexible shell allows vibrational deformation without compromising the vacuum seal or ion optical path stability.
4Adaptability or versatility
If multiple pumping ports are provided for mass spectrometry vacuum requirements, then vacuum flexibility is improved, but vibration sources increase and affect imaging system stability
Solution Approach 1:
Each pumping port is connected through separate flexible connectors with individual bellows, segmenting the vibration transmission paths. This allows each pump to be isolated independently, preventing complex vibration frequencies from one pump from affecting the imaging system through other pump connections.
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 effectively decouples vibrations between mass spectrometry and imaging systems, preventing distortion and maintaining high-resolution imaging capabilities, even with relative displacement, by using flexible connectors and seals to isolate vibrations and ensure continuous ultra-high vacuum ion paths.
Implementation Method 1
The flexible portion can dissipate vibrations and thus reduce or prevent their transmission to the first analytical system
Implementation Method 2
a flexible portion, such as a bellows
Implementation Method 3
a seal, which is preferably a radial seal, separated (i.e. longitudinally separated) from the flexible portion and for vacuum sealing between the connector and a second analytical system
Implementation Method 4
providing vacuum sealing and differential pumping to maintain ultra-high vacuum conditions
Data Source
AI summary
A coupling for connecting together vacuum-based analytical systems requiring to be vibrationally isolated, comprising: a tubular connector having a longitudinal axis, the connector comprising a first end for connection to a first analytical system and a flexible portion reducing transmission of vibrations and permitting displacement of the first analytical system in a direction transverse to the longitudinal axis of the connector; and a seal longitudinally separated from the flexible portion, for vacuum sealing between the connector and a second analytical system; wherein the connector contains ion optics for transmitting ions between the first and second analytical systems.