Vacuum Pump Dynamic Parameter Adjustment for Hydrogen Gas
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Solution Overview
Problem
Vacuum pumps in semiconductor manufacturing are underutilized due to conservative power and temperature settings to avoid rotor-stator clashes, leading to inefficient operation and false alarms when handling hydrogen-rich gases, while conventional methods fail to adjust parameters based on gas chemistry and thermal characteristics.
Innovation Solution
A method and apparatus that adjust the operating parameters of a vacuum pump arrangement by analyzing thermal characteristics of gases through power consumption patterns, allowing for dynamic adjustment of power and temperature limits based on signals from the process tool, enabling the vacuum pump to operate at maximum capacity without risking seizure or excessive temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative power and temperature limits are set to avoid rotor-stator clashes, then reliability is improved, but productivity deteriorates due to underutilization of vacuum pumps
Solution Approach 1:
The patent implements dynamic adjustment of power and temperature limits based on real-time gas composition detection. The system transitions from static conservative limits to dynamic adaptive limits that change according to the thermal conductivity of the pumped gas, allowing the vacuum pump to operate at maximum safe capacity for each specific gas type rather than being constrained by worst-case scenarios
Solution Approach 2:
The system changes operating parameters (power limit, temperature limit) based on the detected thermal characteristics of the gas. By identifying whether the gas has high or low thermal conductivity, the controller adjusts the power and temperature limits accordingly, enabling the pump to operate closer to its true safety boundaries rather than using fixed conservative limits
2Reliability
If temperature limits are set conservatively based on outside temperature, then reliability is improved, but productivity deteriorates due to frequent nuisance tripping
Solution Approach 1:
The system adjusts the temperature limit parameter dynamically based on gas thermal conductivity. For high thermal conductivity gases like hydrogen, the system allows higher temperature limits since heat dissipation is more efficient. For low thermal conductivity gases, more conservative limits are applied. This eliminates nuisance tripping while maintaining safety
Solution Approach 2:
The system uses feedback from gas composition analysis to continuously adjust operating parameters. The controller monitors the thermal characteristics of the pumped gas and uses this information to optimize power and temperature limits in real-time, preventing both nuisance tripping and actual thermal damage
3Productivity
If vacuum pumps are driven harder to increase capacity, then productivity is improved, but reliability deteriorates due to increased risk of rotor-stator clash
Solution Approach 1:
The system changes the power limit parameter based on the thermal conductivity of the pumped gas. For gases with high thermal conductivity that efficiently dissipate heat, the system allows higher power limits and thus higher capacity operation. For gases with low thermal conductivity, more conservative power limits are applied to prevent thermal expansion and rotor-stator clash
Solution Approach 2:
The patent implements dynamic adjustment of power limits based on real-time gas composition detection. The system transitions from static conservative power limits to dynamic adaptive limits that change according to the thermal conductivity of the pumped gas, allowing the vacuum pump to operate at maximum safe capacity for each specific gas type
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
Enables the vacuum pump to operate at greater capacity and efficiency by dynamically adjusting power and temperature limits based on gas composition, reducing the risk of seizure and false alarms, and allowing for a smaller pump design without compromising performance.
Implementation Method 1
The gas with a large proportion of hydrogen tends to have a high thermal conductivity, whereas the gas with a large proportion of heavy gaseous components tends to have a lower thermal conductivity
Data Source
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AI summary
A method for adjusting operating parameters of a vacuum pump arrangement includes determining characteristics of a gas flowing through the vacuum pump arrangement; and setting operating parameters of the vacuum pump arrangement based on the determined characteristics of the first gas. A controller can be configured to perform the method for adjusting the operating parameters of the vacuum pump arrangement in accordance with the characteristics of the gas.