Cryopump Performance Monitoring via Regeneration Cycle Diagnostics
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Solution Overview
Problem
Cryopumps used in vacuum systems, such as those in integrated circuit manufacturing, often fail unexpectedly due to gradual degradation, leading to costly disruptions as they are not effectively monitored for performance decline before failure.
Innovation Solution
A method and circuitry for monitoring cryopump performance by executing a predetermined test routine after regeneration cycles, collecting data, and analyzing it to predict potential failures, allowing for proactive maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryopump performance is monitored continuously, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements performance monitoring during regeneration cycles before the pump is needed for production. By conducting diagnostic tests during these predetermined time periods when the pump is already isolated from the vacuum system, the system establishes a baseline of pump health without interfering with operational reliability requirements.
Solution Approach 2:
The control circuitry that already exists to manage regeneration cycles is extended to also perform diagnostic testing and performance monitoring functions. This multi-functional approach allows the same hardware to serve both regeneration and monitoring purposes, avoiding additional dedicated monitoring equipment.
2Productivity
If test routines are performed during regeneration cycles, then productivity is improved, but measurement precision may worsen due to varying conditions
Solution Approach 1:
The patent acknowledges that regeneration cycles involve varying operational parameters (temperature, pressure, gas flow) that could affect measurement precision. By systematically recording the actual conditions during each test and comparing performance data across similar regeneration states, the system maintains measurement validity while utilizing productive downtime.
Solution Approach 2:
The system collects performance data during regeneration cycles and uses this feedback to track pump degradation trends over time. By comparing current regeneration cycle performance with historical data from previous cycles, the system can identify deterioration patterns even though absolute measurements may vary due to changing conditions.
3Reliability
If performance data is collected and stored over time, then reliability is improved through predictive maintenance, but loss of information increases due to data management requirements
Solution Approach 1:
The patent extracts only the essential performance parameters needed for reliability assessment from the complex set of possible measurements. By focusing on key indicators of pump health (such as vacuum achievement, regeneration efficiency, or power consumption patterns) rather than storing all possible operational data, the system maintains predictive maintenance capability while minimizing data management burden.
Data Source
AI summary
A method of monitoring the performance of a cryopump, the circuitry for monitoring the performance and the cryopump are disclosed. The method comprises: following completion of a regeneration cycle controlling said cryopump to perform a predetermined test routine for testing a performance of said cryopump under predetermined conditions; monitoring said cryopump during said predetermined test routine to collect data indicative of said performance of said cryopump; storing data collected during said monitoring.