Electrostatic Probe Feedback for Chemical Solution Supply Pumps
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Solution Overview
Problem
In semiconductor fabrication facilities, the transportation of low-conductivity or high-resistance chemical solutions through insulating pipelines leads to charge separation and accumulation, generating static electricity, which can damage equipment, cause particle contamination, and pose a risk of ignition or explosion.
Innovation Solution
A system and method for supplying chemical solutions that includes electrostatic probes coupled to pumps and pipelines for continuous measurement and monitoring of static electricity, allowing for real-time adjustment of system parameters to mitigate static electricity generation, using insulating materials like PFA and PTFE to reduce metal contamination and prevent explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If insulating pipelines and pumps are used to transport low-conductivity chemical solutions, then metal contamination is reduced, but static electricity generation increases causing ESD damage and explosion risks
Solution Approach 1:
An electrostatic probe is introduced as an intermediary device between the chemical solution and the insulating pipeline wall. The probe measures electrostatic voltage at the liquid-wall interface, enabling detection of static buildup before it reaches dangerous levels. This intermediary measurement system allows for indirect monitoring of the harmful electrostatic field without direct contact that would cause discharge.
Solution Approach 2:
The system implements a feedback control mechanism where electrostatic voltage measurements from the probe are continuously monitored and fed back to control the pumping process. When the measured voltage exceeds a predetermined threshold, the system automatically adjusts pump operation to reduce electrostatic generation, creating a closed-loop control system that dynamically prevents ESD damage while maintaining transport efficiency.
2Productivity
If pumping speed is increased to improve productivity, then chemical solution transport efficiency increases, but electrostatic voltage generation increases leading to ESD risks
Solution Approach 1:
The pumping system transitions from static operating conditions to dynamic control based on real-time electrostatic measurements. The pump speed and flow rate are continuously adjusted according to the measured electrostatic voltage, allowing the system to operate at high productivity when safe and reduce speed when electrostatic buildup occurs. This dynamic adaptation resolves the contradiction between maintaining high productivity and ensuring safety.
Solution Approach 2:
The system changes operational parameters (pump speed, flow rate, pressure) based on measured electrostatic voltage levels. When voltage exceeds thresholds, parameters are modified to reduce electrostatic generation while maintaining acceptable transport efficiency. This parameter adjustment strategy allows the system to navigate the trade-off between productivity and safety by operating in different parameter regimes.
3Reliability
If electrostatic probes and monitoring systems are added to measure and control static electricity, then ESD damage is prevented, but system complexity increases
Solution Approach 1:
The electrostatic measurement function is extracted as a separate, dedicated probe component rather than being integrated into the existing pump system. This modular extraction allows for specialized electrostatic sensing capabilities while keeping the core pumping system unchanged. The probe can be independently calibrated, maintained, and replaced without affecting the main pump operation, thus managing complexity through functional separation.
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
The system effectively reduces static electricity generation, minimizing particle contamination and the risk of explosions, while maintaining the benefits of using insulating pipelines by promptly adjusting pump parameters based on real-time electrostatic voltage measurements.
Implementation Method 1
a first electrostatic probe coupled to the pump and configured to measure an electrostatic voltage of the pump
Implementation Method 2
using insulating materials like PFA and PTFE in pipelines and pumps to reduce metal contamination and prevent ignition
Implementation Method 3
The buildup of static electricity is often generated by a phenomenon known as a tribocharging theory
Data Source
AI summary
A system includes a chemical storage tank, a pipeline, a pump, a first electrostatic probe, and a control unit. The pipeline is connected to the chemical storage tank. The pump is connected to the pipeline and configured to pump a chemical solution from the chemical storage tank into the pipeline. The first electrostatic probe is coupled to the pump and configured to measure an electrostatic voltage of the pump. The control unit is coupled to the first electrostatic probe and configured to obtain a measurement of an electrostatic voltage from the first electrostatic probe.