Dual Molecular Sieve Air Purification for Continuous IMS Sampling

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Solution Overview

Problem

Ion mobility spectrometers face inefficiencies due to moisture accumulation in molecular sieves, requiring frequent regeneration that disrupts operation and necessitates bulky, heavy additional components, especially in portable detectors.

Innovation Solution

A method and system for simultaneous bake-out of the drift tube and detector inlet while regenerating molecular sieves, allowing concurrent sampling and regeneration modes, reducing downtime by alternating airflow through heated and unused sieves, and eliminating the need for additional pumps and semi-permeable materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If molecular sieve is used for air purification in ion mobility spectrometer, then air cleaning and drying function is provided, but moisture accumulation occurs over time reducing effectiveness

Engineering Contradiction:

Improveair purification effectivenessVSAvoiddowntime for regeneration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The molecular sieve is divided into two separate sieves (first molecular sieve and second molecular sieve) that can operate independently. This segmentation allows one sieve to be regenerated while the other continues to provide air purification, eliminating complete system downtime and resolving the contradiction between maintaining purification effectiveness and allowing regeneration time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements periodic regeneration cycles where each molecular sieve is regenerated at different times in a sequential manner. The first sieve is regenerated while the second sieve is active, then they switch roles. This periodic action ensures continuous air purification while periodically maintaining sieve effectiveness through regeneration.

Inventive Principle:

Principle #19Periodic action

2Reliability

If sieve regeneration is performed by heating, then moisture is removed from molecular sieve, but additional bulky and heavy components are required

Engineering Contradiction:

Improvesieve regeneration capabilityVSAvoidsystem weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The heater is designed to serve multiple functions: it heats the molecular sieve for regeneration, and can also be used to bake out the drift tube and detector inlet simultaneously. This multi-functionality eliminates the need for separate heating components, reducing system weight while maintaining regeneration capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The regeneration function is merged with the bake-out function into a single operational mode. The heater that would normally be used only for regeneration is now combined with the bake-out process, integrating two functions into one and reducing the number of separate components needed in the system.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If total loss air purification system is used, then continuous air flow is provided, but additional components for sieve regeneration are required

Engineering Contradiction:

Improvecontinuous air flow capabilityVSAvoidnumber of regeneration components

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The air purification system is segmented into two independent molecular sieves that can handle the air flow sequentially. This segmentation allows the system to maintain continuous air flow through one sieve while the other is being regenerated, eliminating the need for complex additional regeneration components and reducing overall system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system maintains continuous air purification by switching between the two molecular sieves. While one sieve is being regenerated, the other continues to process air flow continuously. This continuity of useful action ensures uninterrupted air purification without requiring additional complex regeneration hardware.

Inventive Principle:

Principle #20Continuity of useful action

4Productivity

If concurrent sampling and regeneration modes are implemented, then operational efficiency is improved, but control complexity increases

Engineering Contradiction:

Improveoperational efficiencyVSAvoidmode switching control

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system implements dynamic mode switching between sampling and regeneration operations. The controller can dynamically redirect air flow between the two molecular sieves based on operational needs, enabling concurrent sampling and regeneration modes. This dynamic control allows flexible operation while managing complexity through programmable logic.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12504398B2Air purification system for an ion mobility spectrometer, corresponding method of operation and ion mobility spectrometer

Publication Date: 2025.12.23 SMITHS DETECTION WATFORD LTD

AI summary

A method of operating an air purification system (24″) of an ion mobility spectrometer, the method comprising: operating the ion mobility spectrometer in a first sampling mode comprising circulating a flow of air around a closed air circulation system comprising a drift chamber (12) of the ion mobility spectrometer and a first sieve (70) of the air purification system; and operating the ion mobility spectrometer in a first regeneration mode comprising heating the first sieve and circulating a first flow of air through a second sieve (72) of the air purification system and through the drift chamber (12) while passing a second flow of air through the first sieve (70) to an outtake (76).