Purging Device With Segmented Working Area
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Solution Overview
Problem
In semiconductor factories, purging devices halt operations inefficiently when maintenance is required, and relying on oxygen concentration sensors during purging is unreliable due to mixed gas flows, making it difficult to maintain safe oxygen levels.
Innovation Solution
A purging device and method that divides the inner space into a working and non-working area, controlling purge gas supply to halt purging only in the working area and measuring oxygen concentration to ensure safe levels, with an oxygen concentration sensor system that can be carried by workers or attached to a partition to detect changes accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If purging is halted completely when a worker enters for maintenance, then worker safety is ensured, but productivity decreases significantly
Solution Approach 1:
The inner space is divided into a working area (where the worker operates) and a non-working area (where purging continues). This spatial segmentation allows purging to continue in most areas while ensuring safety in the worker's immediate vicinity, resolving the contradiction between safety and productivity
Solution Approach 2:
Different purging control strategies are applied to different spatial zones: the working area has purging halted to maintain high oxygen concentration for worker safety, while the non-working area maintains normal purging operations to preserve productivity. This localized differentiation resolves the overall contradiction
2Reliability
If oxygen concentration sensor is used to monitor purging area, then worker safety can be monitored, but measurement reliability is low due to mixed gas flows
Solution Approach 1:
The monitoring function is segmented from the general purging area and focused specifically on the working area where the worker is present. By concentrating measurement resources on the critical zone rather than attempting to monitor the entire mixed gas environment, reliable safety monitoring is achieved
Solution Approach 2:
The oxygen concentration sensor acts as an intermediary device that specifically monitors the working area conditions. The sensor provides critical information about oxygen levels in the worker's environment without being affected by the complex mixed gas flows in the overall purging system, enabling reliable safety monitoring
3Productivity
If purging continues in the entire inner space, then productivity is maintained, but oxygen concentration may decrease to unsafe levels in the working area
Solution Approach 1:
The inner space is segmented into working and non-working areas with different purging control strategies. The working area has purging halted to prevent oxygen concentration from dropping to unsafe levels, while the non-working area continues purging to maintain overall productivity
Solution Approach 2:
Different oxygen concentration safety standards are applied locally: the working area requires high oxygen concentration (safe for human presence) while the non-working area can maintain lower oxygen concentration (optimized for purging efficiency). This local differentiation resolves the contradiction between productivity and safety
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 minimizes the area where purging is halted, maintains high oxygen concentrations in the working area, and reliably stops purging in adjacent areas if oxygen levels decrease, ensuring worker safety and efficient operation.
Implementation Method 1
an oxygen concentration measuring device configured to measure an oxygen concentration in the working area
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The safety of a worker is ensured, and the area in which purging is halted is limited to the minimum. The inner space of a device is divided into a working area and a non-working area, and purging of articles in the working area is halted and the purging of the articles in the non-working area is continued. The oxygen concentration in the working area is measured, and if the oxygen concentration of the working area decreases to a predetermined value or less, the purging of the articles in the non-working area is halted.