Cryopump Compressor Load Balancing Through Preset Value Control
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Solution Overview
Problem
In large-scale cryopump systems, uneven operation statuses among compressor units lead to faster wear and increased maintenance frequency, resulting in higher downtime due to uneven load distribution.
Innovation Solution
A control unit adjusts preset values for compressor units to equalize their operation statuses by determining control outputs, ensuring that compressor units operate in parallel with balanced loads, thereby reducing differences in operating frequencies and sharing the load more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple compressor units operate in parallel without preset value adjustment, then the system can handle large-scale vacuum pumping requirements, but the operation statuses of compressor units become uneven leading to faster wear and increased maintenance frequency
Solution Approach 1:
The control unit adjusts preset values (such as target differential pressures or control outputs) for individual compressor units based on their operating statuses. By dynamically changing these parameters, the system equalizes the load distribution among parallel compressor units, preventing any single unit from being overloaded while maintaining high vacuum pumping capacity.
2Device complexity
If compressor units operate with unequal load distribution, then system complexity is reduced, but wear damage evolves faster and maintenance frequency increases
Solution Approach 1:
The control unit continuously monitors the operating statuses of all compressor units and uses this feedback information to adjust preset values for individual units. This closed-loop control equalizes wear distribution across compressor units without requiring complex physical modifications to the hardware architecture.
3Reliability
If preset values are adjusted to equalize compressor operation statuses, then wear is reduced and operational life is extended, but control complexity increases
Solution Approach 1:
The control unit automatically adjusts preset values for compressor units based on real-time operating status data. The system performs self-regulation without requiring external intervention or complex manual adjustments, equalizing load distribution through automated feedback control while maintaining operational simplicity.
Data Source
AI summary
A cryopump system includes: a plurality of cryopumps; a plurality of compressor units arranged to operate in parallel in accordance with a control output, respectively, to supply refrigerant gas to the plurality of cryopumps; and a cryopump controller operative to determine the control output for each of the plurality of compressor units. The cryopump controller adjusts a preset value for at least one of the compressor units, the preset value being utilized to determine the control output, so that operation statuses of the respective compressor units are substantially equalized.