Self-Sensing Semiconductor Valve Seals for Predictive Maintenance
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Solution Overview
Problem
In semiconductor manufacturing, existing technologies face challenges in predicting seal degradation and optimizing seal life in slit and gate valves, leading to unnecessary maintenance downtime and potential product failures due to variability in reactant conditions and harsh environments.
Innovation Solution
A method and system for monitoring seal life using sensors to measure micro strain and other operational conditions, allowing for real-time data collection and analysis against baseline data to evaluate seal life as a percentage of its total life, incorporating strain gages and a Wheatstone bridge circuit for precise data conversion and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seals are changed frequently to ensure reliability, then seal reliability is improved, but maintenance downtime and operational interruptions increase
Solution Approach 1:
The patent applies preliminary action by implementing real-time monitoring of seal condition parameters (leak rate, friction force, temperature, vibration) before actual seal failure occurs. This allows maintenance to be scheduled based on actual seal degradation rather than predetermined time intervals, enabling operators to replace seals just before they fail, thus maximizing seal utilization while preventing failures that would cause downtime.
2Ease of manufacture
If seals are changed based on fixed schedules, then maintenance planning is simplified, but unnecessary replacements increase costs and downtime
Solution Approach 1:
The patent implements feedback by continuously monitoring seal condition parameters and comparing them against threshold values that indicate impending failure. This feedback loop provides real-time information about actual seal health, allowing maintenance schedules to be dynamically adjusted based on actual wear rates and operating conditions rather than following rigid predetermined schedules, thereby eliminating unnecessary replacements.
Solution Approach 2:
The patent applies dynamics by transitioning from static, fixed-time maintenance schedules to dynamic, condition-based maintenance timing. The monitoring system captures real-time variations in seal performance under different operating conditions (temperature, pressure, reactant exposure), allowing maintenance intervals to adapt dynamically to actual seal degradation patterns rather than following fixed calendar schedules.
3Measurement precision
If advanced monitoring systems are implemented, then seal life prediction accuracy is improved, but system complexity and initial costs increase
Solution Approach 1:
The patent applies universality by designing a monitoring system that measures multiple seal condition parameters simultaneously (leak rate, friction force, temperature, vibration) using a single integrated system. This multi-functional approach improves prediction accuracy by considering multiple degradation mechanisms at once rather than requiring separate monitoring systems for each parameter, thereby reducing overall system complexity while enhancing measurement precision.
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
This approach enables real-time monitoring and prediction of seal life, optimizing maintenance schedules, minimizing downtime, and preventing failures by providing accurate data on seal health and degradation, thus extending seal life and ensuring consistent product quality.
Implementation Method 1
converting the signal to a voltage signal using a Wheatstone bridge circuit
Implementation Method 2
sensors to measure micro strain and other operational conditions, allowing for real-time data collection and analysis
Data Source
AI summary
Methods, systems and a self-sensing valve assembly are described for monitoring seal life. The method includes providing a valve assembly movable from an open position to a closed position and including a seal seated within the valve and in contact with a surface of the valve assembly, wherein when the seal is in operation it is subject to degradation. At least one sensor is placed for measuring micro strain on a surface of the valve assembly or within the valve assembly. The valve assembly is placed in an operation wherein the seal is subject to degradation and the operation of the valve assembly is initiated. At a time after the operation is initiated, micro strain data is recorded and at least one other property related to a condition selected from an ambient condition of operation and a condition related to degradation of the seal is recorded; and the recorded data is analyzed against baseline data associated with 100% seal life to evaluate seal life at the time after the operation is initiated as a percentage of seal life less than 100%.